KR102616609B1 - Display device - Google Patents

Abstract

A display device according to an embodiment of the present invention includes a substrate having a first sub-pixel, a second sub-pixel, and a third sub-pixel, first electrodes provided in each of the first to third sub-pixels on the substrate, and a first sub-pixel. It includes a light-emitting layer provided on the electrode, a second electrode provided on the light-emitting layer, and first, second, and third color filters provided on the second electrode to correspond to each of the first to third sub-pixels. At least one of the first, second and third color filters includes an inclined surface.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device that displays images.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Accordingly, recently, various display devices such as liquid crystal display (LCD), plasma display panel (PDP), and organic light emitting display (OLED) have been used.

Recently, a head mounted display (HMD) including such a display device has been developed. A head-mounted display (HMD) is a virtual reality (VR) or augmented reality glasses-type monitor device that is worn in the form of glasses or a helmet and focuses on a distance near the user's eyes.

A head-mounted display (HMD) can provide images displayed on a display device to the user's eyes through a lens. Head-mounted displays (HMDs) have a problem in that some of the light emitted from the display device is not provided to the lens and is lost.

The technical task of the present invention is to provide a display device that can minimize light loss.

A display device according to an embodiment of the present invention includes a substrate having a first sub-pixel, a second sub-pixel, and a third sub-pixel, first electrodes provided in each of the first to third sub-pixels on the substrate, and a first sub-pixel. It includes a light-emitting layer provided on the electrode, a second electrode provided on the light-emitting layer, and first, second, and third color filters provided on the second electrode to correspond to each of the first to third sub-pixels. At least one of the first, second and third color filters includes an inclined surface.

A display device according to another embodiment of the present invention includes a substrate having a plurality of sub-pixels, a plurality of color filters provided to correspond to each of the plurality of sub-pixels, and a lens provided on the plurality of color filters. do. Some or all of the plurality of color filters include inclined surfaces.

According to the present invention, by forming an inclined surface on the color filter, light can be refracted in the direction of the condenser lens while passing through the color filter. Accordingly, the light emitted from the display panel can be incident on the condenser lens without loss, thereby improving the luminance of the head-mounted display device.

Additionally, the present invention can achieve miniaturization and weight reduction by minimizing the size of the condenser lens.

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention are described below, or can be clearly understood by those skilled in the art from such description and description.

1A and 1B are perspective views showing a head-mounted display device according to an embodiment of the present invention.
FIG. 2 is an exemplary diagram showing an example of the display panel housing of FIGS. 1A and 1B.
FIG. 3 is an exemplary diagram showing another example of the display panel housing of FIGS. 1A and 1B.
Figure 4 is a perspective view showing the display panel of Figures 2 and 3.
Figure 5 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention.
Figure 6 is a diagram for explaining a color filter according to an embodiment of the present invention.
Figure 7 is a diagram showing a case where light refracted at an inclined surface is incident on an area outside the converging lens.
8 is a schematic cross-sectional view of a display panel according to another embodiment of the present invention.
Figure 9 is a diagram for explaining a color filter according to another embodiment of the present invention.
Figure 10 is a diagram showing an example in which light emitted from a color filter is incident on a condensing lens.
11A to 11I are cross-sectional views showing a method of manufacturing a display panel according to an embodiment of the present invention.
12A to 12I are cross-sectional views showing a method of manufacturing a display panel according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the examples described in detail below along with the accompanying drawings. However, the present invention is not limited to the examples disclosed below and will be implemented in various different forms. These examples only serve to ensure that the disclosure of the present invention is complete and will be provided to those skilled in the art to which the present invention pertains. It is provided to completely inform the scope of the invention, and the invention is only defined by the scope of the claims.

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining examples of the present invention are illustrative and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in the present invention are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

When describing the components of the present invention, terms such as first and second may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there are no other components between each component. It should be understood that may be “interposed” or that each component may be “connected,” “combined,” or “connected” through other components.

Each feature of the various examples of the present invention can be combined or combined with each other, partially or entirely, and various technical interconnections and operations are possible, and each example can be implemented independently of each other or together in a related relationship. .

Hereinafter, an example of a display device according to the present invention will be described in detail with reference to the attached drawings. In adding reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings.

1A and 1B are perspective views showing a head-mounted display device according to an embodiment of the present invention. FIG. 1A shows the rear of the display housing 20 of the head-mounted display device 10, and FIG. 1B shows the front of the display housing 20 of the head-mounted display device 10. there is.

1A and 1B, the head-mounted display device 10 according to an embodiment of the present invention includes a display storage unit 20, a first eyepiece 30, a second eyepiece 40, and a first eyepiece. It includes a glass 50, a second glass 60, and eyeglass frame legs 70.

The head-mounted display device 10 according to an embodiment of the present invention is illustrated as being implemented in the form of glasses including frame legs 70 so that the user can easily put them on or take them off, as shown in FIGS. 1A and 1B, but is limited to this. It doesn't work. That is, the head-mounted display device 10 may include a head-mounted band that can be mounted on the head instead of the glasses frame legs 70.

The display storage unit 20 includes a display module that displays an image and optical means for providing the image displayed on the display module to the first and second eyepieces 30 and 40. A detailed description of the display storage unit 20 will be described later in conjunction with FIGS. 2 and 3.

The first and second eyepieces 30 and 40 may be disposed on the back of the display storage unit 20 . The first eyepiece 30 may be a left eye lens where the user's left eye is located, and the second eyepiece 40 may be a right eye lens where the user's right eye is located. Because of this, the user can view the image displayed on the display module of the display panel housing 20 through the first and second eyepieces 30 and 40. Each of the first and second eyepieces 30 and 40 may be implemented as a convex lens or a Fresnel lens, but is not limited thereto.

The first and second glasses 50 and 60 may be disposed in the front of the display storage unit 20 . The first glass 50 is disposed to correspond to the first eyepiece 30, and the second glass 60 is disposed to correspond to the second eyepiece 40. Due to this, the user can see the background of the front side of the display compartment 20 shown by the first and second glasses 50 and 60 through the first and second eyepieces 30 and 40. . The first and second glasses 50 and 60 may be designed to be opened and closed according to the user's request. Alternatively, the first and second glasses 50 and 60 may be omitted.

FIG. 2 is an exemplary diagram showing an example of the display panel housing of FIGS. 1A and 1B.

Figure 2 corresponds to a side view of the display panel storage unit viewed from one side. Figure 2 shows the configuration of the display panel accommodating part 20 arranged to correspond to the first eyepiece 30, and the configuration of the display panel accommodating part 20 arranged to correspond to the second eyepiece 40. Since they are substantially the same as those shown in FIG. 2, they are omitted.

Referring to FIG. 2 , the display panel storage unit 20 may include a display panel 21 and a condensing lens 22 .

The display panel 21 may be a display device that displays a predetermined image. For example, the display panel 21 may be an organic light emitting display device, a liquid crystal display, an organic light emitting device on silicon substrate (OLEDoS), or a liquid crystal on silicon substrate (LCoS). , or it can be implemented as a small display device such as LEDoS (light emitting diode on silicon substrate). Below, for convenience of explanation, it is illustrated that the display panel 21 is an organic light emitting display device, but the embodiment of the present invention is not limited thereto. A detailed description of the display panel 21 will be described later in conjunction with FIGS. 5 to 10 .

The condenser lens 22 may be disposed between the display panel 21 and the first eyepiece 30. The condenser lens 22 provides the image displayed on the display panel 21 to the first eyepiece 30. The condenser lens 22 may be implemented as a convex lens or a Fresnel lens, but is not limited thereto.

Meanwhile, the first and second glasses 50 and 60 may be designed to be opened and closed according to the user's request. Alternatively, the first and second glasses 50 and 60 may be omitted.

As discussed above, the embodiment of the present invention can provide a virtual image displayed by the display module of the display panel housing 20 to the user's eyes through the first eyepiece 30. As a result, embodiments of the present invention can implement virtual reality (VR).

FIG. 3 is an exemplary diagram showing another example of the display panel housing of FIGS. 1A and 1B.

Figure 3 corresponds to a side view of the display panel storage unit viewed from one side. Figure 3 shows the configuration of the display panel accommodating part 20 arranged to correspond to the first eyepiece 30, and the configuration of the display panel accommodating part 20 arranged to correspond to the second eyepiece 40. Since they are substantially the same as those shown in FIG. 3, they are omitted.

Referring to FIG. 3 , the display panel storage unit 20 may include a display panel 21, a condenser lens 22, and a transmission reflection unit 23.

The display panel 21 may be disposed on one side, for example, on the upper side of the transmission and reflection portion 23 without blocking the first glass 50 . Accordingly, the display panel 21 can provide an image to the transmission reflector 23 without blocking the external background visible through the first glass 50.

The display panel 21 may be a display device that displays a predetermined image. For example, the display panel 21 may be an organic light emitting display device, a liquid crystal display, an organic light emitting device on silicon substrate (OLEDoS), or a liquid crystal on silicon substrate (LCoS). , or it can be implemented as a small display device such as LEDoS (light emitting diode on silicon substrate).

Below, for convenience of explanation, it is illustrated that the display panel 21 is an organic light emitting display device, but the embodiment of the present invention is not limited thereto. A detailed description of the display panel 21 will be described later in conjunction with FIGS. 5 to 10 .

The condenser lens 22 may be disposed between the display panel 21 and the transmission reflection unit 23. The condenser lens 22 condenses the image of the display panel 21 and provides it to the transmission and reflection unit 23. The condenser lens 22 may be implemented as a convex lens or a Fresnel lens, but is not limited thereto.

The transmission reflector 23 may be disposed between the condenser lens 22 and the first eyepiece lens 30. The transmission reflector 23 may be a half mirror or a reflective polarizer that transmits part of the light and reflects another part of the light. The half mirror includes glass and a semi-transparent metal film formed on one side of the glass. The semitransmissive metal film may be formed of a semitransmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). The reflective polarizer may be an advanced polarizing film (APF) or a dual bright enhanced film (DBEF), but is not limited thereto.

One embodiment of the present invention includes a transmission reflection portion 23 that transmits part of the light and reflects another part of the light, thereby transmitting the light incident from the first glass 50 and displaying the light displayed on the display panel 21. The image can be advanced to the first eyepiece 30. Accordingly, the user can view both the background shown by the first glass 50 and the image displayed on the display panel 21 through the first eyepiece 30. In other words, since the user can view the real background and the virtual image as one image by overlapping them, Augmented Reality (AR) can be implemented.

FIG. 4 is a perspective view showing the display panel of FIGS. 2 and 3, FIG. 5 is a schematic cross-sectional view of the display panel according to an embodiment of the present invention, and FIG. 6 illustrates a color filter according to an embodiment of the present invention. This is a drawing for this purpose. For convenience, the substrate 100, circuit element layer 200, first electrode 300, bank 400, light emitting layer 500, second electrode 600, and encapsulation layer 700 are not shown in FIG. 6. .

4 and 5, the display panel 21 according to an embodiment of the present invention includes a substrate 100, a circuit element layer 200, a first electrode 300, a bank 400, and a light emitting layer 500. ), a second electrode 600, an encapsulation layer 700, and a color filter 800.

The substrate 100 may be made of glass or plastic, but is not necessarily limited thereto, and may be made of a semiconductor material such as a silicon wafer. The substrate 100 may be made of a transparent material or an opaque material. A first sub-pixel (P1), a second sub-pixel (P2), and a third sub-pixel (P3) are provided on the substrate 100. The first sub-pixel (P1) may be configured to emit red light, the second sub-pixel (P2) may be configured to emit green light, and the third sub-pixel (P3) may be configured to emit blue light, but are not necessarily limited thereto. However, for example, the arrangement order of each sub-pixel (P1, P2, P3) may be changed in various ways.

The display device according to an embodiment of the present invention is made of a so-called top emission method in which the emitted light is emitted toward the top, and therefore, not only transparent materials but also opaque materials are used as materials for the substrate 100. It can be.

The circuit element layer 200 is formed on the substrate 100.

The circuit element layer 200 is provided with circuit elements including various signal wires, thin film transistors, and capacitors for each sub-pixel (P1, P2, and P3). The signal wires may include a gate wire, a data wire, a power wire, and a reference wire, and the thin film transistor may include a switching thin film transistor, a driving thin film transistor 250, and a sensing thin film transistor.

The switching thin film transistor switches according to the gate signal supplied to the gate wire and supplies the data voltage supplied from the data wire to the driving thin film transistor.

The driving thin film transistor 250 switches according to the data voltage supplied from the switching thin film transistor, generates a data current from the power supplied from the power wiring, and supplies it to the first electrodes 310, 320, and 330.

The sensing thin film transistor serves to sense the threshold voltage deviation of the driving thin film transistor, which causes deterioration in image quality. In response to a sensing control signal supplied from the gate wiring or a separate sensing wiring, the current of the driving thin film transistor is connected to the reference wiring. supplied by

The capacitor serves to maintain the data voltage supplied to the driving thin film transistor 250 for one frame, and is connected to the gate terminal and source terminal of the driving thin film transistor 250, respectively.

The circuit element layer 200 is provided with a contact hole (CH) for each sub-pixel (P1, P2, and P3), and the source terminal or drain terminal of the driving thin film transistor 250 is exposed through the contact hole (CH). As shown, the contact hole CH may be provided in a light-emitting area that does not overlap the bank 400, but the contact hole (CH) is not necessarily limited thereto and may be provided in a non-light-emitting area that overlaps the bank 400.

The first electrode 300 is patterned for each sub-pixel (P1, P2, and P3) on the circuit element layer 200. One first electrode 310 is formed in the first sub-pixel (P1), another first electrode 320 is formed in the second sub-pixel (P2), and another first electrode 320 is formed in the third sub-pixel (P3). Another first electrode 330 is formed.

The first electrodes 310, 320, and 330 are connected to the driving thin film transistor 250 provided in the circuit element layer 200. Specifically, the first electrodes 310, 320, and 330 are connected to the source terminal or drain terminal of the driving thin film transistor 250 through the contact hole (CH) provided in the circuit element layer 200.

The bank 400 is formed to cover the ends of the first electrodes 310, 320, and 330 on the circuit element layer 200, so that current is concentrated at the ends of the first electrodes 310, 320, and 330 to emit light. Problems with reduced efficiency can be prevented.

The bank 400 is formed in a matrix structure at the boundary between the plurality of sub-pixels (P1, P2, and P3) and defines a light-emitting area in each of the plurality of sub-pixels (P1, P2, and P3). That is, the exposed area of the first electrodes 310, 320, and 330 where the bank 400 is not formed in each sub-pixel (P1, P2, and P3) becomes a light emitting area. The bank 400 may be made of a relatively thin inorganic insulating film, but may also be made of a relatively thick organic insulating film.

The light emitting layer 500 is formed on the first electrodes 310, 320, and 330. The light emitting layer 500 may also be formed on the bank 400. That is, the light emitting layer 500 is also formed in each sub-pixel (P1, P2, and P3) and the boundary area between them.

The light emitting layer 500 may be provided to emit white (W) light. To this end, the light emitting layer 500 may include a plurality of stacks that emit light of different colors.

The second electrode 600 is formed on the light emitting layer 500. The second electrode 600 may function as a cathode of the display device. Like the light emitting layer 500, the second electrode 600 is formed in each sub-pixel (P1, P2, P3) and the boundary area between them. That is, the second electrode 600 may also be formed on the upper part of the bank 400.

Since the display device according to an embodiment of the present invention is made of a top-emitting type, the second electrode 600 may include a conductive material that can transmit light emitted from the light-emitting layer 500 toward the top. In particular, the second electrode 600 may be made of a semi-transparent electrode, and thus a micro cavity effect can be obtained for each sub-pixel (P1, P2, and P3). When the second electrode 600 is made of a translucent electrode, reflection and re-reflection of light is repeated between the second electrode 600 and the first electrodes 310, 320, and 330, thereby obtaining a micro cavity effect.

According to an embodiment of the present invention, the distance between the first electrodes 310, 320, and 330 and the second electrode 600 is configured differently for each sub-pixel (P1, P2, and P3) through micro cavity characteristics. Light of different wavelengths is emitted for each sub-pixel (P1, P2, and P3).

When the first electrodes 310, 320, and 330 include a reflective electrode and the second electrode 600 includes a translucent electrode, reflection and re-reflection of light may be repeated between the reflective electrode and the translucent electrode. When the distance between the reflective electrode and the translucent electrode is an integer multiple of the half-wavelength (λ/2) of light of a specific wavelength, constructive interference may occur and external extraction efficiency of light may be improved. This characteristic of light is called a microcavity characteristic.

Using this micro cavity characteristic, for example, when the distance between the reflective electrode and the translucent electrode in the first sub-pixel P1 is set to be an integer multiple of the half-wavelength of the red wavelength light, Light undergoes constructive interference, and light of other wavelengths undergo destructive interference, so red wavelength light is emitted at a greater intensity than light of other wavelengths from the first sub-pixel (P1), thereby emitting red light from the first sub-pixel (P1). A release effect can be achieved.

In addition, when the distance between the reflective electrode and the translucent electrode in the second sub-pixel P2 is set to be an integer multiple of the half-wavelength of the green wavelength light, constructive interference occurs in the green wavelength light and light of other wavelengths cancels out. Due to interference, green wavelength light is emitted from the second sub-pixel P2 with a greater intensity than light of other wavelengths, thereby producing an effect in which green light is emitted from the second sub-pixel P2.

In addition, when the distance between the reflective electrode and the translucent electrode in the third sub-pixel P3 is set to be an integer multiple of the half-wavelength of the blue wavelength light, constructive interference occurs in the blue wavelength light and light of other wavelengths cancels out. Due to interference, blue wavelength light is emitted from the third sub-pixel P3 with a greater intensity than light of other wavelengths, thereby producing the effect of blue light being emitted from the third sub-pixel P3.

As such, according to one embodiment of the present invention, red light is emitted from the first sub-pixel (P1), green light is emitted from the second sub-pixel (P2), and blue light is emitted from the third sub-pixel (P3). It can be configured to emit this. However, even if the micro cavity characteristic is used, not only light in the desired wavelength range is emitted from each sub-pixel (P1), but some light in the undesired wavelength range may be mixed. For example, rather than emitting only red light, the first sub-pixel P1 may emit a mixture of red light and light of another color, specifically cyan color light.

Therefore, according to one embodiment of the present invention, by forming the color filter 800 on the second electrode 600, light in an unwanted wavelength range is emitted from each sub-pixel P1 by the color filter 800. block it

The encapsulation layer 700 is formed on the second electrode 600 and serves to prevent external moisture from penetrating into the light emitting layer 500. Such an encapsulation layer 700 may be made of an inorganic insulating material or may be made of a structure in which inorganic insulating materials and organic insulating materials are alternately stacked, but is not necessarily limited thereto.

Meanwhile, although not shown in FIG. 5, a capping layer may be additionally formed between the second electrode 600 and the encapsulation layer 700.

The color filter 800 is formed on the encapsulation layer 700. The color filter 800 absorbs light in a certain wavelength range among the light emitted from the light emitting layer 500, so that only light in a specific wavelength range can be emitted for each sub-pixel (P1, P2, and P3). The color filter 800 can be formed using materials known in the art, such as dye, resin, or dielectric, which absorb light in a specific wavelength range.

The color filter 800 is patterned for each sub-pixel (P1, P2, and P3). Specifically, the color filter 800 includes a first color filter 810 provided to correspond to the first sub-pixel (P1), a second color filter 820 provided to correspond to the second sub-pixel (P2), and It includes a third color filter 830 provided to correspond to the third sub-pixel P3.

The first color filter 810 includes a red pigment that absorbs light outside the red wavelength range among the light emitted from the light emitting layer 500. The first color filter 810 passes light in the red wavelength band and absorbs light in other wavelength bands, such as light in the green wavelength band and light in the blue wavelength band.

In the first sub-pixel P1, light in the red wavelength range is emitted at a greater intensity than light in other wavelength ranges using the micro cavity characteristic. However, even if the micro cavity characteristic is used, the first sub-pixel P1 may not emit only light in the red wavelength range but may emit light mixed with some undesired wavelength range light. The first color filter 810 passes light in the red wavelength range and absorbs light in other wavelength ranges, allowing light in the red wavelength range to be emitted from the first sub-pixel P1.

This first color filter 810 may be formed to include an inclined surface. More specifically, as shown in FIG. 6, the first color filter 810 is provided on a lower surface 810c facing the second electrode 600 and an upper surface facing the lower surface 810c, and is inclined with the lower surface 810c. It may include an inclined surface 810b forming an inclined surface 810b, and a flat surface 810a extending from the inclined surface 810b and formed to be parallel to the lower surface 810c.

At this time, the inclined surface 810b of the first color filter 810 may be spaced apart from the lower surface 810c, but is not necessarily limited to this. In another embodiment, the first color filter 810 may be formed so that the inclined surface 810b and the lower surface 810c contact each other. Meanwhile, the first color filter 810 including an inclined surface 810b has an asymmetric structure.

The light emitted from the light emitting layer 500 disposed in the first sub-pixel (P1) is incident on the lower surface 810c of the first color filter 810 and is transmitted to the flat surface 810a or the inclined surface (810a) of the first color filter 810. 810b). At this time, light passing through the flat surface 810a of the first color filter 810 is not refracted, while light passing through the inclined surface 810b of the first color filter 810 is refracted at the inclined surface 810b.

At this time, the inclination θ1 of the inclined surface 810b of the first color filter 810 with the lower surface 810c may be greater than 0 degrees and less than 45 degrees. When the inclination θ1 becomes greater than 45 degrees, the light incident on the first color filter 810 is totally reflected at the inclined surface 810b, or the light refracted at the inclined surface 810b is collected as shown in FIG. It may be incident on an area outside the lens 22. That is, optical loss may occur.

The second color filter 820 includes a green pigment that absorbs light outside the green wavelength range among the light emitted from the light emitting layer 500. The second color filter 820 passes light in the green wavelength band and absorbs light in other wavelength bands, such as light in the red wavelength band and light in the blue wavelength band.

In the second sub-pixel P2, light in the green wavelength range is emitted at a greater intensity than light in other wavelength ranges using the micro cavity characteristic. However, even if the micro cavity characteristic is used, the second sub-pixel P2 may not emit only light in the green wavelength range but may emit a mixture of light in an undesired wavelength range. The second color filter 820 passes light in the green wavelength range and absorbs light in other wavelength ranges, allowing light in the green wavelength range to be emitted from the second sub-pixel P2.

This second color filter 820 may be formed to include an inclined surface. More specifically, as shown in FIG. 6, the second color filter 820 is provided on a lower surface 820c facing the second electrode 600 and an upper surface facing the lower surface 820c, and is inclined with the lower surface 820c. It may include an inclined surface 820b forming an inclined surface 820b, and a flat surface 820a extending from the inclined surface 820b and formed to be parallel to the lower surface 820c. At this time, the inclined surface 820b of the second color filter 820 may be spaced apart from the lower surface 820c, but is not necessarily limited to this. In another embodiment, the second color filter 820 may be formed such that the inclined surface 820b and the lower surface 820c are in contact with each other. Meanwhile, the second color filter 820 including an inclined surface 820b has an asymmetric structure.

The light emitted from the light emitting layer 500 disposed in the second sub-pixel P2 is incident on the lower surface 820c of the second color filter 820 and is transmitted to the flat surface 820a or the inclined surface (820a) of the second color filter 820. 820b). At this time, light passing through the flat surface 820a of the second color filter 820 is not refracted, while light passing through the inclined surface 820b of the second color filter 820 is refracted at the inclined surface 820b.

At this time, the inclination θ2 of the inclined surface 820b of the second color filter 820 with the lower surface 820c may be greater than 0 degrees and less than 45 degrees. When the inclination θ2 becomes greater than 45 degrees, the light incident on the second color filter 820 is totally reflected at the inclined surface 820b, or the light refracted at the inclined surface 820b is collected as shown in FIG. It may be incident on an area outside the lens 22. That is, optical loss may occur.

The third color filter 830 includes a blue pigment that absorbs light outside the blue wavelength range among the light emitted from the light emitting layer 500. The third color filter 830 passes light in the blue wavelength band and absorbs light in other wavelength bands, such as light in the red wavelength band and light in the green wavelength band.

In the third sub-pixel P3, light in the blue wavelength range is emitted at a greater intensity than light in other wavelength ranges using the micro cavity characteristic. However, even if the micro cavity characteristic is used, the third sub-pixel P3 may not emit only light in the blue wavelength range but may emit light mixed with some undesired wavelength range light. The third color filter 830 passes light in the blue wavelength range and absorbs light in other wavelength ranges, allowing light in the blue wavelength range to be emitted from the third sub-pixel P3.

This third color filter 830 may be formed to include an inclined surface. More specifically, as shown in FIG. 6, the third color filter 830 is provided on a lower surface 830c facing the second electrode 600 and an upper surface facing the lower surface 830c, and is inclined with the lower surface 830c. It may include an inclined surface 830b forming an inclined surface 830b, and a flat surface 830a extending from the inclined surface 830b and formed to be parallel to the lower surface 830c. At this time, the inclined surface 830b of the third color filter 830 may be spaced apart from the lower surface 830c, but is not necessarily limited to this. In another embodiment, the third color filter 830 may be formed so that the inclined surface 830b and the lower surface 830c contact each other. Meanwhile, the third color filter 830 including the inclined surface 830b has an asymmetric structure.

The light emitted from the light emitting layer 500 disposed in the third sub-pixel P3 is incident on the lower surface 830c of the third color filter 830 and is transmitted to the flat surface 830a or the inclined surface (830a) of the third color filter 830. 830b). At this time, light passing through the flat surface 830a of the third color filter 830 is not refracted, while light passing through the inclined surface 830b of the third color filter 830 is refracted at the inclined surface 830b.

At this time, the inclination θ3 of the inclined surface 830b of the third color filter 830 with the lower surface 830c may be greater than 0 degrees and less than 45 degrees. When the inclination θ3 becomes greater than 45 degrees, the light incident on the third color filter 830 is totally reflected at the inclined surface 830b, or the light refracted at the inclined surface 830b is collected as shown in FIG. It may be incident on an area outside the lens 22. That is, optical loss may occur.

The first, second, and third color filters 810, 820, and 830 according to an embodiment of the present invention are characterized by including inclined surfaces 810b, 820b, and 830b. The first, second, and third color filters 810, 820, and 830 may refract a portion of the light incident from the light emitting layer 500 toward the converging lens 22 using the inclined surfaces 810b, 820b, and 830b. . Accordingly, the display panel 21 according to an embodiment of the present invention can reduce the area where light is emitted. Since most of the light emitted from the display panel 21 may be incident on the converging lens 22, light loss between the display panel 21 and the condensing lens 22 can be minimized. The luminance of a head-mounted display device can be improved.

5 and 6 illustrate that inclined surfaces 810b, 820b, and 830b are formed on all of the first, second, and third color filters 810, 820, and 830, but the present invention is not limited thereto.

In another embodiment, the inclined surface 810b, 820b, and 830b may be formed on only one of the first, second, and third color filters 810, 820, and 830. For example, the second color filter 820 may have an inclined surface 820b and a flat surface 820a formed on its upper surface. The first and third color filters 810 and 830 may not have inclined surfaces on their upper surfaces and may only have flat surfaces 810a and 830a. In this case, the manufacturing process of the first, second, and third color filters 810, 820, and 830 is performed in the order of the first color filter 810, the third color filter 830, and the second color filter 820. You can. That is, because the second color filter 820 is formed between the pre-formed first color filter 810 and the third color filter 830, it may be easy to form the inclined surface 820b during the manufacturing process.

FIG. 8 is a schematic cross-sectional view of a display panel according to another embodiment of the present invention, and FIG. 9 is a diagram for explaining a color filter according to another embodiment of the present invention.

The display panel 21 according to another embodiment of the present invention includes a substrate 100, a circuit element layer 200, a first electrode 300, a bank 400, a light emitting layer 500, and a first electrode 300. It includes two electrodes 600, an encapsulation layer 700, and a color filter 800.

The substrate 100, circuit element layer 200, first electrode 300, bank 400, light emitting layer 500, second electrode 600, and encapsulation layer 700 shown in FIG. 8 are shown in FIG. 5. Since it is substantially the same as the configurations shown in , detailed description will be omitted. Hereinafter, the color filter 800 according to another embodiment of the present invention will be mainly described.

The color filter 800 according to another embodiment of the present invention is formed on the encapsulation layer 700. The color filter 800 absorbs light in a certain wavelength range among the light emitted from the light emitting layer 500, so that only light in a specific wavelength range can be emitted for each sub-pixel (P1, P2, and P3). The color filter 800 can be formed using materials known in the art, such as dye, resin, or dielectric, which absorb light in a specific wavelength range.

The color filter 800 is patterned for each sub-pixel (P1, P2, and P3). Specifically, the color filter 800 includes a first color filter 810 provided to correspond to the first sub-pixel (P1), a second color filter 820 provided to correspond to the second sub-pixel (P2), and It includes a third color filter 830 provided to correspond to the third sub-pixel P3.

The first color filter 810 includes a red pigment that absorbs light outside the red wavelength range among the light emitted from the light emitting layer 500. The first color filter 810 passes light in the red wavelength band and absorbs light in other wavelength bands, such as light in the green wavelength band and light in the blue wavelength band.

In the first sub-pixel P1, light in the red wavelength range is emitted at a greater intensity than light in other wavelength ranges using the micro cavity characteristic. However, even if the micro cavity characteristic is used, the first sub-pixel P1 may not emit only light in the red wavelength range but may emit light mixed with some undesired wavelength range light. The first color filter 810 passes light in the red wavelength range and absorbs light in other wavelength ranges, allowing light in the red wavelength range to be emitted from the first sub-pixel P1.

This first color filter 810 may be formed to include an inclined surface. More specifically, the first color filter 810 is provided on a lower surface 810c facing the second electrode 600 and an upper surface facing the lower surface 810c, as shown in FIG. 9, and is connected to the lower surface 810c. It may include an inclined surface 810b. At this time, the inclined surface 810b of the first color filter 810 may be spaced apart from the lower surface 810c, but is not necessarily limited to this. In another embodiment, the first color filter 810 may be formed so that the inclined surface 810b and the lower surface 810c contact each other. Meanwhile, the first color filter 810 including an inclined surface 810b has an asymmetric structure.

Light emitted from the light emitting layer 500 disposed in the first sub-pixel P1 is incident on the lower surface 810c of the first color filter 810 and is emitted to the inclined surface 810b of the first color filter 810. At this time, light passing through the inclined surface 810b of the first color filter 810 is refracted at the inclined surface 810b.

At this time, the inclination θ1 of the inclined surface 810b of the first color filter 810 with the lower surface 810c may be greater than 0 degrees and less than 45 degrees. When the inclination θ1 becomes greater than 45 degrees, the light incident on the first color filter 810 is totally reflected at the inclined surface 810b, or the light refracted at the inclined surface 810b is collected as shown in FIG. It may be incident on an area outside the lens 22. That is, optical loss may occur.

Meanwhile, the minimum height h1 of the first color filter 810 from the lower surface 810c to the inclined surface 810b may be smaller than the inclined height h2 of the inclined surface 810b, but is not necessarily limited thereto. In another embodiment, the minimum height h1 from the lower surface 810c to the inclined surface 810b of the first color filter 810 may be greater than the inclined height h2 of the inclined surface 810b. Even in this case, the minimum height h1 from the lower surface 810c to the inclined surface 810b may be set to not be more than three times greater than the inclined height h2 of the inclined surface 810b. When the minimum height (h1) from the lower surface (810c) to the inclined surface (810b) is three times or more than the inclined height (h2) of the inclined surface (810b), the light emitted from the light emitting layer 500 disposed in the first sub-pixel (P1) A portion of the light may pass through the first color filter 810 and proceed to the adjacent second color filter 820 or third color filter 830. Accordingly, color mixing may occur.

The second color filter 820 includes a green pigment that absorbs light outside the green wavelength range among the light emitted from the light emitting layer 500. The second color filter 820 passes light in the green wavelength band and absorbs light in other wavelength bands, such as light in the red wavelength band and light in the blue wavelength band.

In the second sub-pixel P2, light in the green wavelength range is emitted at a greater intensity than light in other wavelength ranges using the micro cavity characteristic. However, even if the micro cavity characteristic is used, the second sub-pixel P2 may not emit only light in the green wavelength range but may emit a mixture of light in an undesired wavelength range. The second color filter 820 passes light in the green wavelength range and absorbs light in other wavelength ranges, allowing light in the green wavelength range to be emitted from the second sub-pixel P2.

This second color filter 820 may be formed to include an inclined surface. More specifically, as shown in FIG. 6, the second color filter 820 is provided on a lower surface 820c facing the second electrode 600 and an upper surface facing the lower surface 820c, and is inclined with the lower surface 820c. It may include an inclined surface 820b forming an inclined surface 820b, and a flat surface 820a extending from the inclined surface 820b and formed to be parallel to the lower surface 820c. At this time, the inclined surface 820b of the second color filter 820 may be spaced apart from the lower surface 820c, but is not necessarily limited to this. In another embodiment, the second color filter 820 may be formed such that the inclined surface 820b and the lower surface 820c are in contact with each other. Meanwhile, the second color filter 820 including an inclined surface 820b has an asymmetric structure.

The light emitted from the light emitting layer 500 disposed in the second sub-pixel P2 is incident on the lower surface 820c of the second color filter 820 and is transmitted to the flat surface 820a or the inclined surface (820a) of the second color filter 820. 820b). At this time, light passing through the flat surface 820a of the second color filter 820 is not refracted, while light passing through the inclined surface 820b of the second color filter 820 is refracted at the inclined surface 820b.

At this time, the inclination θ2 of the inclined surface 820b of the second color filter 820 with the lower surface 820c may be greater than 0 degrees and less than 45 degrees. When the inclination θ2 becomes greater than 45 degrees, the light incident on the second color filter 820 is totally reflected at the inclined surface 820b, or the light refracted at the inclined surface 820b is collected as shown in FIG. It may be incident on an area outside the lens 22. That is, optical loss may occur.

Meanwhile, the minimum height h1 of the second color filter 820 from the lower surface 820c to the inclined surface 820b may be smaller than the inclined height h2 of the inclined surface 820b, but is not necessarily limited thereto. In another embodiment, the minimum height h1 from the lower surface 820c to the inclined surface 820b of the second color filter 820 may be greater than the inclined height h2 of the inclined surface 820b. Even in this case, the minimum height h1 from the lower surface 820c to the inclined surface 820b may be set to not be more than three times greater than the inclined height h2 of the inclined surface 820b. When the minimum height (h1) from the lower surface (820c) to the inclined surface (820b) is three times or more than the inclined height (h2) of the inclined surface (820b), the light emitted from the light emitting layer 500 disposed in the second sub-pixel (P2) A portion of the light may pass through the second color filter 820 and proceed to the adjacent first color filter 810 or third color filter 830. Accordingly, color mixing may occur.

The third color filter 830 includes a blue pigment that absorbs light outside the blue wavelength range among the light emitted from the light emitting layer 500. The third color filter 830 passes light in the blue wavelength band and absorbs light in other wavelength bands, such as light in the red wavelength band and light in the green wavelength band.

In the third sub-pixel P3, light in the blue wavelength range is emitted at a greater intensity than light in other wavelength ranges using the micro cavity characteristic. However, even if the micro cavity characteristic is used, the third sub-pixel P3 may not emit only light in the blue wavelength range but may emit light mixed with some undesired wavelength range light. The third color filter 830 passes light in the blue wavelength range and absorbs light in other wavelength ranges, allowing light in the blue wavelength range to be emitted from the third sub-pixel P3.

This third color filter 830 may be formed to include an inclined surface. More specifically, as shown in FIG. 6, the third color filter 830 is provided on a lower surface 830c facing the second electrode 600 and an upper surface facing the lower surface 830c, and is inclined with the lower surface 830c. It may include an inclined surface 830b forming an inclined surface 830b, and a flat surface 830a extending from the inclined surface 830b and formed to be parallel to the lower surface 830c. At this time, the inclined surface 830a of the third color filter 830 may be spaced apart from the lower surface 830c, but is not necessarily limited to this. In another embodiment, the third color filter 830 may be formed so that the inclined surface 830a and the lower surface 830c contact each other. Meanwhile, the third color filter 830 including an inclined surface 830a has an asymmetric structure.

The light emitted from the light emitting layer 500 disposed in the third sub-pixel P3 is incident on the lower surface 830c of the third color filter 830 and is transmitted to the flat surface 830a or the inclined surface (830a) of the third color filter 830. 830b). At this time, light passing through the flat surface 830a of the third color filter 830 is not refracted, while light passing through the inclined surface 830b of the third color filter 830 is refracted at the inclined surface 830b.

At this time, the inclination θ3 of the inclined surface 830b of the third color filter 830 with the lower surface 830c may be greater than 0 degrees and less than 45 degrees. When the inclination θ3 becomes greater than 45 degrees, the light incident on the third color filter 830 is totally reflected at the inclined surface 830b, or the light refracted at the inclined surface 830b is collected as shown in FIG. It may be incident on an area outside the lens 22. That is, optical loss may occur.

Meanwhile, the minimum height (h1) of the third color filter 830 from the lower surface (830c) to the inclined surface (830b) may be smaller than the inclined height (h2) of the inclined surface (830b), but is not necessarily limited thereto. In another embodiment, the minimum height h1 of the second color filter 830 from the lower surface 830c to the inclined surface 830b may be greater than the inclined height h2 of the inclined surface 830b. Even in this case, the minimum height h1 from the lower surface 830c to the inclined surface 830b may be set to not be more than three times greater than the inclined height h2 of the inclined surface 830b. When the minimum height (h1) from the lower surface (830c) to the inclined surface (830b) is three times or more than the inclined height (h2) of the inclined surface (830b), the light emitted from the light emitting layer 500 disposed in the third sub-pixel (P2) A portion of the light may pass through the third color filter 830 and proceed to the adjacent first color filter 810 or second color filter 820. Accordingly, color mixing may occur.

The first, second, and third color filters 810, 820, and 830 according to another embodiment of the present invention are characterized by including inclined surfaces 810b, 820b, and 830b. The first, second, and third color filters 810, 820, and 830 may refract a portion of the light incident from the light emitting layer 500 toward the converging lens 22 using the inclined surfaces 810b, 820b, and 830b. . Accordingly, the display panel 21 according to another embodiment of the present invention can reduce the area where light is emitted. Since most of the light emitted from the display panel 21 may be incident on the converging lens 22, light loss between the display panel 21 and the condensing lens 22 can be minimized. The luminance of a head-mounted display device can be improved.

Figure 10 is a diagram showing an example in which light emitted from a color filter is incident on a condensing lens. For convenience, the circuit element layer 200, the first electrode 300, the bank 400, the light emitting layer 500, the second electrode 600, and the encapsulation layer 700 are not shown in FIG. 10.

Referring to FIG. 10 , a condenser lens 22 is disposed on the display panel 21 including a plurality of color filters 800 . The plurality of color filters 800 include a center color filter (CCF) disposed at the center of the substrate 100, a right color filter (RCF) disposed to the right of the center of the substrate 100, and a center color filter (RCF) disposed at the center of the substrate 100. It can be distinguished by the left color filter (LCF) placed on the left.

The center color filter (CCF) corresponds to the center of the converging lens 22, and a flat surface is formed on the upper surface facing the lower surface. The center color filter (CCF) does not have an inclined surface formed on its upper surface. Accordingly, the light passing through the center color filter (CCF) proceeds toward the center of the converging lens 22.

The right color filter (RCF) corresponds to the right area of the converging lens 22, and an inclined surface is formed on the upper surface facing the lower surface. In FIG. 10, the right color filter (RCF) is shown as having only inclined surfaces 810b, 820b, and 830c on the upper surface like the color filters 810, 820, and 830 shown in FIG. 8, but is not necessarily limited thereto. . The right color filter (RCF) may be provided with inclined surfaces (810b, 820b, 830c) and flat surfaces (810a, 820a, 830a) on its upper surface, like the color filters (810, 820, and 830) shown in FIG. 5.

The right color filter (RCF) has a slope inclined to the right. Accordingly, the light passing through the right color filter (RCF) is refracted to the left by the inclined surface inclined to the right and proceeds toward the converging lens 22.

The inclination of the inclined surface formed on the right color filter (RCF) is proportional to the distance from the center of the substrate 100. The inclination of the inclined surface formed in the right color filter (RCF) increases as the distance from the center of the substrate 100 increases, and decreases as it approaches the center of the substrate 100. That is, the degree of refraction of light passing through the right color filter (RCF) increases as the distance from the center of the substrate 100 increases, and the degree of refraction decreases as it approaches the center of the substrate 100. Accordingly, most of the light passing through the right barrel filter (RCF) may proceed toward the condensing lens 22 and be incident on the right area of the condensing lens 22.

The left color filter (LCF) corresponds to the left area of the converging lens 22, and an inclined surface is formed on the upper surface facing the lower surface. In FIG. 10, the left color filter (LCF) is shown as having only inclined surfaces 810b, 820b, and 830c on the upper surface like the color filters 810, 820, and 830 shown in FIG. 8, but is not necessarily limited thereto. . The left color filter (LCF) may be provided with inclined surfaces (810b, 820b, 830c) and flat surfaces (810a, 820a, 830a) on its upper surface, like the color filters (810, 820, and 830) shown in FIG. 5.

The left color filter (LCF) has an inclined surface inclined to the left. Accordingly, the light passing through the left color filter (LCF) is refracted to the right by the inclined surface inclined to the left and proceeds toward the converging lens 22.

The inclination of the inclined surface formed on the left color filter (LCF) is proportional to the distance from the center of the substrate 100. The slope of the inclined surface formed in the left color filter (RCF) increases as the distance from the center of the substrate 100 increases, and decreases as it approaches the center of the substrate 100. That is, the degree of refraction of the light passing through the left color filter (LCF) increases as it moves away from the center of the substrate 100, and the degree of refraction decreases as it approaches the center of the substrate 100. Accordingly, most of the light passing through the left color filter (LCF) may proceed toward the condenser lens 22 and be incident on the left area of the condenser lens 22 .

As described above, the light emitted from the light emitting layer 500 is refracted to the right while passing through the left color filter (LCF), and is refracted to the left while passing through the right color filter (RCF). Accordingly, the second width W2 of the condenser lens 22 may be formed to be smaller than the first width W1 of the display panel 21. The head-mounted display device according to an embodiment of the present invention can achieve miniaturization and weight reduction by minimizing the size of the converging lens 22.

11A to 11I are cross-sectional views showing a method of manufacturing a display panel according to an embodiment of the present invention.

First, the circuit element layer 200, the driving thin film transistor 250, the first electrodes 310, 320, and 330, and the bank 400 are formed on the substrate 110 as shown in FIG. 11A.

An active layer for each of the driving thin film transistors 250 is formed on the substrate 100. The active layer may be formed of a polycrystalline silicon-based semiconductor material, a single-crystalline silicon-based semiconductor material, or an oxide-based semiconductor material.

Then, a gate insulating film is formed on the active layer. The gate insulating film may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer thereof.

Then, a gate electrode is formed on the gate insulating film.

Then, an insulating film is formed on the active layer and the gate electrode. The first insulating layer may be formed of an inorganic layer, for example, a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or a multilayer thereof.

Then, first and second contact holes are formed through the first insulating film and connected to the active layer. A source electrode connected to the active layer through the first contact hole and a drain electrode connected to the active layer through the second contact hole are formed on the first insulating film.

Then, a first insulating film is additionally formed on the source electrode and the drain electrode. A third contact hole is formed through the additionally formed first insulating film and connected to the drain electrode. An M3 metal layer connected to the drain electrode through a third contact hole is formed on the additionally formed first insulating film.

Then, a second insulating film is formed on the M3 metal layer. The second insulating film may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer thereof.

Then, a fourth contact hole is formed through the second insulating film and connected to the M3 metal layer. An M4 metal layer connected to the M3 metal layer through a fourth contact hole is formed on the second insulating film.

Then, a second insulating film is additionally formed on the M4 metal layer. A fifth contact hole is formed through the additionally formed second insulating film and connected to the M4 metal layer. The M3 metal layer, the M4 metal layer, and the second insulating layer may be omitted.

Then, first electrodes 310, 320, and 330 are formed on the second insulating film. More specifically, a first electrode film is formed on the second insulating film. The first electrode film has a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), an APC alloy, and a laminated structure of APC alloy and ITO (ITO/APC/ITO). It can be formed by including a metal material with high reflectance such as. APC alloy is an alloy of silver (Ag), palladium (Pb), and copper (Cu).

Then, a photoresist pattern is formed on the first electrode film. A photoresist pattern may be formed at a location where the first, second, and third sub-pixels P1, P2, and P3 will be formed. The first electrode film not covered by the photo resist pattern is dry etched to form the first electrodes 310, 320, and 330, and the photo resist pattern is removed.

Next, a bank 400 is formed to cover the edges of the first electrodes 310, 320, and 330.

Specifically, a filling material is formed on the first electrodes 310, 320, and 330. The filling material may be an organic material, such as acrylic resin, epoxy resin, phenolic resin, polyamide resin or polyimide resin.

Then, the bank 400 is formed by dry etching. The dry etching material is preferably selected as a material that can etch the filling material but cannot etch the first electrodes 310, 320, and 330.

Next, the light emitting layer 500 and the second electrode 600 are formed as shown in FIG. 11B.

More specifically, the light emitting layer 500 is formed on the first electrodes 310, 320, and 330. The light emitting layer 500 may be a white light emitting layer that emits white light. In this case, the light emitting layer 500 may be a common layer commonly formed in the sub-pixels P1, P2, and P3.

When the light emitting layer 500 is a white light emitting layer, it may be formed in a tandem structure of two or more stacks. Each of the stacks may include a hole transporting layer, at least one light emitting layer, and an electron transporting layer.

Additionally, a charge generation layer may be formed between the stacks. The charge generation layer may include an n-type charge generation layer located adjacent to the lower stack and a p-type charge generation layer formed on the n-type charge generation layer and located adjacent to the upper stack. The n-type charge generation layer injects electrons into the lower stack, and the p-type charge generation layer injects holes into the upper stack. The n-type charge generation layer may be made of an organic layer doped with an alkali metal such as Li, Na, K, or Cs, or an alkaline earth metal such as Mg, Sr, Ba, or Ra. The p-type charge generation layer can be formed by doping an organic material with hole transport ability with a dopant.

Then, the second electrode 600 is formed on the light emitting layer 500. The second electrode 600 is a transparent conductive material (TCO) such as ITO or IZO, or a translucent material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). It can be formed of a metallic material (semi-transmissive conductive material). The second electrode 600 may be formed by a physical vapor deposition method such as sputtering.

Next, an encapsulation layer 700 is formed as shown in FIG. 11C. More specifically, a first inorganic layer (not shown) may be formed on the second electrode 600. The first inorganic layer (not shown) may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide. The first inorganic layer (not shown) may be deposited using a CVD (Chemical Vapor Deposition) technique or an ALD (Atomic Layer Deposition) technique, but is not limited thereto.

Then, an organic layer (not shown) is formed on the first inorganic layer (not shown). The organic film (not shown) may be formed of an organic material such as acryl resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin. You can.

Then, a second inorganic layer (not shown) is formed on the organic layer (not shown). The second inorganic layer (not shown) may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide. The second inorganic layer (not shown) may be deposited using a CVD (Chemical Vapor Deposition) technique or an ALD (Atomic Layer Deposition) technique, but is not limited thereto.

Next, a red color filter film 815 is formed on the substrate 100 on which the encapsulation layer 700 is formed, as shown in FIG. 11D. The red color filter film 815 may include a negative photosensitive organic film whose exposed portion is hardened. A mask with an open area O is placed on the red color filter film 815 at a position corresponding to the first sub-pixel P1, and exposed. The portion of the red color filter film 815 disposed in the open area O of the mask is hardened. At this time, the open area O of the mask may be partially divided. In this case, in the divided area of the open area (O), a photoreaction may occur due to diffraction of light at the boundary between the open area (O) and the mask, even in the part that is not irradiated with light by the mask. .

Then, as shown in FIG. 11E, the red color filter film 815 formed in the second and third sub-pixels (P2 and P3) is removed through a development process to form a pattern of the first color filter 810.

The first color filter 810 may have an inclined surface 810b formed in a divided area of the open area O, and a flat surface 810a may be formed in the remaining area of the open area O.

Next, a green color filter film 825 is formed on the substrate 100 as shown in Figure 11f. The green color filter film 825 may include a negative photosensitive organic film whose exposed portion is hardened. A mask with an open area O is placed on the green color filter film 825 at a position corresponding to the second sub-pixel P2, and exposed. The green color filter film 825 is cured in a portion disposed in the open area O of the mask. At this time, the open area O of the mask may be partially divided. In this case, in the divided area of the open area (O), a photoreaction may occur due to diffraction of light at the boundary between the open area (O) and the mask, even in the part that is not irradiated with light by the mask. .

Then, as shown in FIG. 11g, the green color filter film 825 formed in the first and third sub-pixels P1 and P3 is removed through a development process to form a pattern of the second color filter 820.

In the second color filter 820, an inclined surface 820b may be formed in a divided area of the open area O, and a flat surface 820a may be formed in the remaining area of the open area O.

Next, a blue color filter film 835 is formed on the substrate 100 as shown in Figure 11h. The blue color filter film 835 may include a negative photosensitive organic film whose exposed portion is hardened. A mask with an open area O is placed on the blue color filter film 835 at a position corresponding to the third sub-pixel P3, and exposed. The portion of the blue color filter film 835 disposed in the open area O of the mask is hardened. At this time, the open area O of the mask may be partially divided. In this case, in the divided area of the open area (O), a photoreaction may occur due to diffraction of light at the boundary between the open area (O) and the mask, even in the part that is not irradiated with light by the mask. .

Then, as shown in FIG. 11I, the blue color filter film 835 formed in the first and second sub-pixels P1 and P2 is removed through a development process to form a pattern of the third color filter 830.

In the third color filter 830, an inclined surface 830b may be formed in a divided area of the open area O, and a flat surface 830a may be formed in the remaining area of the open area O.

12A to 12I are cross-sectional views showing a method of manufacturing a display panel according to another embodiment of the present invention.

Since the manufacturing method shown in FIGS. 12A to 12C is substantially the same as the manufacturing method shown in FIGS. 11A to 11C, detailed description thereof will be omitted.

First, the circuit element layer 200, the driving thin film transistor 250, the first electrodes 310, 320, and 330, and the bank 400 are formed on the substrate 110 as shown in FIG. 12A.

Next, the light emitting layer 500 and the second electrode 600 are formed as shown in FIG. 12B.

Next, an encapsulation layer 700 is formed as shown in FIG. 12C.

Next, a red color filter film 815 is formed on the substrate 100 on which the encapsulation layer 700 is formed, as shown in FIG. 12D. The red color filter film 815 may include a negative photosensitive organic film whose exposed portion is hardened. A mask with an open area O is placed on the red color filter film 815 at a position corresponding to the first sub-pixel P1, and exposed. The portion of the red color filter film disposed in the open area (O) of the mask is cured.

Then, as shown in FIG. 12E, the red color filter film 815 formed in the second and third sub-pixels (P2 and P3) is removed through a development process to form a pattern of the first color filter 810.

Next, a blue color filter film 835 is formed on the substrate 100 as shown in FIG. 12F. The blue color filter film 835 may include a negative photosensitive organic film whose exposed portion is hardened. A mask with an open area O is placed on the blue color filter film 835 at a position corresponding to the third sub-pixel P3, and exposed. The portion of the blue color filter film 835 disposed in the open area O of the mask is hardened.

Then, as shown in FIG. 12g, the blue color filter film 835 formed in the first and second sub-pixels (P1 and P2) is removed through a development process to form a pattern of the third color filter 830.

Next, a green color filter film 825 is formed on the substrate 100 as shown in FIG. 12h. The green color filter film 825 may include a negative photosensitive organic film whose exposed portion is hardened. A mask with an open area O is placed on the green color filter film 825 at a position corresponding to the second sub-pixel P2, and exposed. The green color filter film 825 is cured in a portion disposed in the open area O of the mask. At this time, the open area O of the mask is formed smaller than the second sub-pixel P2 and has a small line width. In this case, part of the second sub-pixel P2 may be obscured by a mask. In this way, even in areas that are not irradiated with light by the mask, the open area (O) has a small line width, so a photoreaction can occur due to diffraction of light at the boundary between the open area (O) and the mask. there is.

Then, as shown in FIG. 12I, the green color filter film 825 formed in the first and third sub-pixels P1 and P3 is removed through a development process to form a pattern of the second color filter 820.

At this time, the second color filter 820 may have an inclined surface 820b formed in the area covered by the mask, and a flat surface 820a may be formed in the open area O.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

100: substrate 200: circuit element layer
250: driving thin film transistor 310, 320, 330: first electrode
400: Bank 500: Emitting layer
600: second electrode 700: encapsulation layer
800: Color filter

Claims (18)

a substrate having a first sub-pixel, a second sub-pixel, and a third sub-pixel;
first electrodes provided in each of the first to third sub-pixels on the substrate;
A light emitting layer provided on the first electrode;
a second electrode provided on the light emitting layer; and
First, second and third color filters provided on the second electrode to correspond to each of the first to third sub-pixels,
At least one of the first, second and third color filters includes an inclined surface,
A display device wherein the inclined surface has an inclination between the lower surface facing the second electrode and is greater than 0 degrees and less than 45 degrees. delete According to paragraph 1,
A display device wherein the inclined surface is spaced apart from the lower surface. According to paragraph 1,
The inclined surface is a display device provided on an upper surface facing the lower surface. According to paragraph 4,
The display device wherein the upper surface provided with the inclined surface further includes a flat surface extending from the inclined surface and parallel to the lower surface. According to paragraph 1,
A display device wherein the inclination is proportional to the distance from the center of the substrate. According to clause 6,
The color filter disposed to the right of the center of the substrate has the inclined surface inclined to the right, and the color filter disposed to the left of the center of the substrate has the inclined surface inclined to the left. a substrate having a first sub-pixel, a second sub-pixel, and a third sub-pixel;
first electrodes provided in each of the first to third sub-pixels on the substrate;
A light emitting layer provided on the first electrode;
a second electrode provided on the light emitting layer; and
First, second and third color filters provided on the second electrode to correspond to each of the first to third sub-pixels,
At least one of the first, second and third color filters includes an inclined surface,
A display device wherein the color filter including the inclined surface has an asymmetric structure. According to paragraph 1,
The first sub-pixel emits red light, the second sub-pixel emits green light, and the third sub-pixel emits blue light,
The first color filter is provided to correspond to the first sub-pixel, the second color filter is provided to correspond to the second sub-pixel, and the third color filter is provided to correspond to the third sub-pixel. ,
A display device wherein the second color filter includes an inclined surface. According to paragraph 1,
Each of the first, second and third color filters includes an inclined surface. A substrate having a plurality of sub-pixels;
a plurality of color filters provided to correspond to each of the plurality of sub-pixels; and
Including a lens provided on the plurality of color filters,
Some or all of the plurality of color filters include inclined surfaces,
A display device wherein the color filter including the inclined surface has an asymmetric structure. delete A substrate having a plurality of sub-pixels;
a plurality of color filters provided to correspond to each of the plurality of sub-pixels; and
Including a lens provided on the plurality of color filters,
Some or all of the plurality of color filters include inclined surfaces,
The inclined surface is provided on an upper surface of the color filter facing the lens,
A display device in which the slope formed by the lower surface of the color filter is greater than 0 degrees and less than 45 degrees. delete According to clause 13,
The display device wherein the upper surface provided with the inclined surface further includes a flat surface extending from the inclined surface and parallel to the lower surface of the color filter. According to clause 13,
A display device wherein the inclination is proportional to the distance from the center of the lens. According to clause 16,
The color filter disposed to the right of the center of the lens has the inclined surface inclined to the right, and the color filter disposed to the left of the center of the substrate has the inclined surface inclined to the left. According to clause 11,
A display device in which the lens has a width smaller than that of the substrate.

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