KR102676375B1 - Display device - Google Patents

Abstract

A display device according to an example of the present application includes a substrate having a plurality of sub-pixels, a first insulating layer provided on the substrate, a reflector disposed on the first insulating layer, a second insulating layer disposed on the reflector, and a second insulating layer disposed on the reflector. 2 Reflect or refract some of the light emitted from the first electrode disposed on the insulating layer or the reflector, the organic light-emitting layer provided on the first electrode, the second electrode provided on the organic light-emitting layer, and the organic light-emitting layer, or It includes a pattern to increase the light emitting area of the sub-pixel, and the pattern is provided to be disposed on at least one of the reflector, the first electrode, and the second electrode, so that light can be concentrated toward the center of the sub-pixel, thereby preventing color mixing. Light efficiency can be improved.

Description

Display device {DISPLAY DEVICE}

This application 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.

Among display devices, organic light emitting displays are self-luminous and have superior viewing angles and contrast ratios compared to liquid crystal displays (LCDs). They do not require a separate backlight, so they can be lightweight and thin, and have the advantage of low power consumption. . In addition, organic light emitting display devices have the advantage of being capable of driving at low direct current voltages, having a fast response speed, and especially low manufacturing costs.

Recently, a head mounted display including such an organic light emitting display device has been developed. Head Mounted Display (HMD) is a virtual reality (VR) 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.

On the other hand, in organic light emitting display devices, some of the light emitted from the organic light emitting layer is not concentrated in the center of the pixel and spreads to the outside, which reduces light efficiency, and some of the light that is not concentrated interferes with adjacent pixels, resulting in color mixing. There is a problem. This problem becomes more severe in the case of head-mounted displays (HMDs) including organic light emitting displays. Accordingly, research is being actively conducted on ultra-high resolution head-mounted displays that can prevent color mixing while improving light efficiency.

The technical task of this application is to provide a display device that can prevent color mixing while improving light efficiency.

A display device according to an example of the present application includes a substrate having a plurality of sub-pixels, a first insulating layer provided on the substrate, a reflector disposed on the first insulating layer, a second insulating layer disposed on the reflector, and 2 Reflect or refract some of the light emitted from the first electrode disposed on the insulating layer or the reflector, the organic light-emitting layer provided on the first electrode, the second electrode provided on the organic light-emitting layer, and the organic light-emitting layer, or It may include a pattern to increase the light emitting area of the sub-pixel, and the pattern may be disposed on at least one of a reflector, a first electrode, and a second electrode.

The display device according to the present application is provided with a pattern on at least one of the first electrode, which is an anode electrode, the second electrode disposed on top of the first electrode, and the reflector disposed below the first electrode, so that the display device moves toward the center of the sub-pixel. Since light can be condensed, light efficiency can be improved while preventing color mixing.

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

1 is a schematic plan view of a display device according to an embodiment of the present application.
FIG. 2 is a schematic cross-sectional view taken along line I-I shown in FIG. 1.
Figure 3 is a schematic structural diagram of the organic light-emitting layer of Figure 2.
FIG. 4 is a schematic diagram showing the period and depth of the reflection pattern of FIG. 2 and the thickness of the second insulating layer.
5A to 5C are schematic graphs showing the wavelength and light intensity according to the depth of the reflection pattern for each red sub-pixel, green sub-pixel, and blue sub-pixel of the display device according to an embodiment of the present application.
Figure 6 is a schematic cross-sectional view of a display device according to a second embodiment of the present application.
Figure 7 is a schematic cross-sectional view of a display device according to a third embodiment of the present application.
Figure 8 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present application.
Figure 9 is a schematic graph showing the relative period ratio and light efficiency increase rate for red light, green light, and blue light of the display device according to the fourth embodiment of the present application.
10A to 10C relate to a display device according to a fifth embodiment of the present application, which relates to a head mounted display (HMD) device.

The advantages and features of the present application 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 application 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 application is complete and to those skilled in the art to which the present application pertains. It is provided to fully inform the scope of the invention, and the present application is defined only by the scope of the claims.

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining examples of the present application are illustrative, and the present application is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present application, if it is determined that a detailed description of related known technology may unnecessarily obscure the gist of the present application, the detailed description will be omitted. When 'comprises', 'has', 'consists of', etc. mentioned in the present application 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 application.

In describing the components of this application, terms such as first, second, etc. 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 application can be partially or entirely combined or combined with each other, and various technological interconnections and operations are possible, and each example may be implemented independently of each other or together in a related relationship. .

Hereinafter, an example of a display device according to the present application 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.

FIG. 1 is a schematic plan view of a display device according to an embodiment of the present application, FIG. 2 is a schematic cross-sectional view taken along line I-I shown in FIG. 1, and FIG. 3 is a schematic structural diagram of the organic light-emitting layer of FIG. 2. , FIG. 4 is a schematic diagram showing the period and depth of the reflection pattern of FIG. 2 and the thickness of the second insulating layer, and FIGS. 5A to 5C show a red sub-pixel and a green sub-pixel of the display device according to an embodiment of the present application. This is a schematic graph showing the wavelength and light intensity according to the depth of the reflection pattern for each sub-pixel and blue sub-pixel.

1 to 5C, the display device 1 according to an example of the present application includes a substrate 2, a first insulating layer 3, a reflector 4, a second insulating layer 5, and a first insulating layer 5. It includes an electrode (6), an organic light-emitting layer (7), a second electrode (8), a pattern (P), and an encapsulation layer (9).

The substrate 2 may be a plastic film, a glass substrate, or a semiconductor substrate such as silicon.

The substrate 2 may include a plurality of sub-pixels. The sub-pixel may be one of a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light. The red sub-pixel, the green sub-pixel, and the blue sub-pixel may form one pixel. When the one pixel further includes a white sub-pixel that emits white light, the sub-pixel may be a white sub-pixel. In the red sub-pixel, a red color filter may be provided on the upper side of the encapsulation layer 9 to emit red light. In the green sub-pixel, a green color filter may be provided on the upper side of the encapsulation layer 9 to emit green light. In the blue sub-pixel, a blue color filter may be provided on the upper side of the encapsulation layer 9 to emit blue light. 1 to 4 show as an example the first sub-pixel 21, one of a red sub-pixel, a green sub-pixel, and a blue sub-pixel forming one pixel.

The first sub-pixel 21 may emit different colors depending on the color transmitted by the color filter disposed on the upper side of the encapsulation layer 9, but is not limited thereto, and is not limited to this, and is not limited to display device 1 according to an embodiment of the present application. ), if the light extraction efficiency of a specific color can be improved, a color filter may not be provided. The first sub-pixel 21 may include an organic light-emitting device including a reflector 4, a first electrode 6, an organic light-emitting layer 7, and a second electrode 8.

The first insulating layer 3 is provided on one side of the substrate 2. The first insulating layer 3 may include a plurality of thin film transistors, gate lines, data lines, and a plurality of sub-pixels. Sub-pixels are provided in an area defined by the intersection structure of gate lines and data lines. In this specification, only the first thin film transistor 31a disposed in the first sub-pixel 21 in the first insulating layer 3 will be described as an example.

The first thin film transistor 31a is disposed in the first sub-pixel 21 within the first insulating layer 3. The first thin film transistor 31a according to an example is connected to the first electrode 6 disposed on the first sub-pixel 21 and driven to emit light of the color corresponding to the first sub-pixel 21. Voltage can be applied.

The first sub-pixel 21 according to an example uses the first thin film transistor 31a to supply a predetermined current to the organic light emitting device according to the data voltage of the data line when a gate signal is input from the gate line. Because of this, the organic light emitting element of the first sub-pixel 21 can emit light with a predetermined brightness according to a predetermined current.

The reflector 4 may be disposed on the first insulating layer 3. The first reflector 4 directs the light emitted toward the reflector 4 among the light emitted from the organic light emitting layer 7 of the first sub-pixel 21 to the second electrode 8 or the encapsulation layer 9. This is to reflect it towards. To this end, the reflector 4 may include a reflective material to reflect light. For example, the reflective material may be a metal, but is not necessarily limited thereto and may be any other material as long as it can reflect light.

Since the reflector 4 is disposed at a relatively lower position than the organic light-emitting layer 7 that emits light, it can reflect light emitted from the organic light-emitting layer 7 upward. Here, the upper side refers to the direction in which the user can perceive light, and may, for example, refer to the side where the encapsulation layer 9 or the color filter layer (not shown) is disposed. Accordingly, the light efficiency of the first sub-pixel 21 can be further improved compared to the case without the reflector 4, and the user can enjoy high brightness through the improved light efficiency. In other words, you can perceive a clear image.

The reflector 4 may be disposed only in the first sub-pixel 21, but is not limited to this and may be disposed as a common layer across a plurality of sub-pixels.

The reflector 4 may include a reflection pattern (RP). The reflection pattern RP is used to reflect light emitted from the organic light-emitting layer 7 toward the reflector 4 toward the center of the first sub-pixel 21. The center of the first sub-pixel 21 may mean half of the width (EAW, shown in FIG. 4) of the emission area of the first sub-pixel 21. The width (EAW) of the emission area of the first sub-pixel 21 may mean the width at which the first electrode 6, which is not obscured by the bank B, emits light when an electric field is formed with the second electrode 8. there is. Therefore, reflecting light toward the center of the first sub-pixel 21 means that the light emitted from the first sub-pixel 21 is transmitted to the second sub-pixel (not shown) adjacent to both sides of the first sub-pixel 21. This may mean that the light is reflected so that it is only emitted from the first sub-pixel 21 and not toward the third sub-pixel (not shown). For example, if the first sub-pixel 21 is a red sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a blue sub-pixel, the light emitted from the red sub-pixel is either the green sub-pixel or the green sub-pixel. By preventing emission toward the blue sub-pixel, mixing of red light with green or blue light can be prevented.

The reflection pattern (RP) according to an example is formed by removing a part of the first insulating layer 3 using a lift-off or dry etching process, and then attaching the reflector 4 to the first insulating layer 3. It can be formed by depositing on the insulating layer 3. A detailed description of the reflection pattern RP will be provided again after the encapsulation layer 9 is described.

The second insulating layer 5 may be disposed on the reflector 4. The second insulating layer 5 is provided on one surface of the reflector 4. The second insulating layer 5 is disposed between the reflector 4 and the first electrode 6 to space the reflector 4 and the first electrode 6 apart. As the reflector 4 and the first electrode 6 are spaced apart, it can contribute to implementing micro cavity characteristics, which will be described later. The second insulating layer 5 may be made of an insulating material and may function to insulate the reflector 4 and the first electrode 6.

Like the reflector 4, the second insulating layer 5 may be disposed only on the first sub-pixel 21, but is not limited to this and may be disposed as a common layer across a plurality of sub-pixels.

The first electrode 6 is provided on the substrate 2. More specifically, the first electrode 6 may be disposed on the reflector 4 or the second insulating layer 5. When the second insulating layer 5 is provided on the reflector 4, the first electrode 6 may be disposed on the second insulating layer 5. When the second insulating layer 5 is not provided on the reflector 4, the first electrode 6 may be disposed on the reflector 4.

The first electrode 6 according to one example has a stacked structure of aluminum and titanium (Ti/Al/Ti), a stacked structure of aluminum and ITO (ITO/Al/ITO), an APC alloy, and a stacked structure of APC alloy and ITO. It can be formed including a highly reflective metal material such as (ITO/APC/ITO). APC alloy is an alloy of silver (Ag), palladium (Pb), and copper (Cu). The first electrode 6 may be an anode. In FIG. 2, the first electrode 6 is shown as being disposed only in the first sub-pixel 21, but the first electrode 6 may be disposed in each of a plurality of sub-pixels.

The first electrode 6 disposed in the first sub-pixel 21 may be formed on the reflector 4. The first electrode 6 is connected to the source electrode of the first thin film transistor 31a through a contact hole penetrating the first insulating layer 3, the reflector 4, and the second insulating layer 5. The first electrode 6 is connected to the reflector 4 through a contact hole penetrating the second insulating layer 5, and the reflector 4 is connected to the reflector 4 through a contact hole penetrating the first insulating layer 3. It may be connected to the first thin film transistor 31a by being connected to the first thin film transistor 31a through a hole.

The first electrode 6 may include a first electrode pattern (FEP). The first electrode pattern (FEP) is used to increase the light emitting area of the first sub-pixel 21. The first electrode pattern (FEP) according to an example is formed by removing a part of the second insulating layer 5 using a lift-off or dry etching process, etc., and then removing the second insulating layer (5). 5) It can be formed by depositing the first electrode 6 on it. However, the present invention is not limited to this, and the first electrode pattern (FEP) may be formed by depositing the first electrode (6) on the second insulating layer (5) formed along the profile of the reflection pattern (RP). In this case, the reflection pattern (RP) and the first electrode pattern (FEP) may be provided in the same shape. A detailed description of the first electrode pattern (FEP) will be described again along with the reflector 4 after explaining the encapsulation layer 9.

Referring to FIGS. 1 and 2, the bank B covers the end of the first electrode 6 and includes a first sub-pixel 21 and a second sub-pixel (not shown) adjacent to the first sub-pixel 21. ) is provided between. The bank B may be included in the bank area (shaded portion in FIG. 1) surrounding the first electrode 6. The bank B according to one example is used to distinguish the first sub-pixel 21 from the second sub-pixel. The bank (B) serves to define the sub-pixel area, that is, the light emitting unit. Additionally, the area where the bank B is formed does not emit light and can therefore be defined as a non-emission area. The light emitting portion may be an area where the first electrode 6 and the second electrode 8 are not obscured by the bank B and generate an electric field. Also, the area of the light emitting part may be the light emitting area (EA) of the sub-pixel.

The bank (B) may be formed of an organic film such as acryl resin, epoxy resin, phenolic resin, polyamise resin, or polyimide resin. . An organic light-emitting layer 7 is formed on the first electrode 6 and the bank B.

Referring to FIG. 2, the bank B may include a bank upper surface and a bank inclined surface.

The bank upper surface of the bank (B) is the surface located on the upper side of the bank (B).

The bank inclined surface of the bank B is a surface extending from the upper surface of the bank to the upper surface of the first electrode 6. Accordingly, the bank inclined surface and the upper surface of the first electrode 6 may form a predetermined angle. The predetermined angle may be greater than 50° and less than 90° as the width of the bank narrows as display devices are implemented with high resolution.

The organic light-emitting layer 7 is provided on the first electrode 6. The organic light-emitting layer 7 according to one example is a common layer commonly formed in the first sub-pixel 21, the second sub-pixel, and the bank B, and may be a white light-emitting layer that emits white light. In this case, the organic light emitting layer 7 may be formed in a tandem structure of two or more stacks. Each of the stacks may include a hole transporting layer (HTL), at least one light emitting layer, and an electron transporting layer (ETL). When a high-potential voltage is applied to the first electrode 6 and a low-potential voltage is applied to the second electrode 8, holes and electrons move to the light-emitting layer through the hole transport layer and electron transport layer, respectively, and combine with each other in the light-emitting layer to emit light. do.

The organic light-emitting layer 7 is composed of a plurality of organic layers, and the plurality of organic layers may include a first stack, a second stack, and a charge generation layer (CGL) provided between the first stack and the second stack. The first stack is disposed on the first electrode 6 and includes a first hole transport layer (HTL1), a first light emitting layer 71 that emits light of a first color, and a first electron transport layer (ETL1). It can be done. The first stack includes a first hole injection layer between the first electrode 6 and the first hole transport layer (HTL1), and a first electron injection layer between the first electron transport layer (ETL1) and the charge generation layer (CGL). It may include more. The second stack is disposed on the first stack, and includes a second hole transport layer (HTL2), a second light-emitting layer 72 that emits light of a second color, and a third light-emitting layer 73 that emits light of a third color. ), and a second electron transport layer (ETL2). The second stack includes a second hole injection layer between the charge generation layer (CGL) and the second hole transport layer (HTL2), and a second electron injection layer between the second electron transport layer (ETL2) and the second electrode 8. More may be included.

For example, the first light-emitting layer 71 is a blue light-emitting layer that emits blue light, the second light-emitting layer 72 is a red light-emitting layer that emits red light, and the third light-emitting layer 73 is a green light-emitting layer. It may be a light emitting layer. As a result, the organic light emitting layer 7 of the display device 1 according to an embodiment of the present application emits light by stacking the first to third light emitting layers 71, 72, and 73, thereby emitting blue light, red light, and green light. It can emit white light mixed with light.

The charge generation layer (CGL) may include an n-type charge generation layer positioned adjacent to the first stack and a p-type charge generation layer formed on the n-type charge generation layer and positioned adjacent to the second stack. The n-type charge generation layer injects electrons into the first stack, and the p-type charge generation layer injects holes into the second 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.

In this specification, the organic light-emitting layer 7 has been described as having a two-stack structure including the first light-emitting layer 71, the second light-emitting layer 72, and the third light-emitting layer 73, but the organic light-emitting layer 7 is not limited thereto. ) may be provided in a two-stack structure of a first light-emitting layer that emits blue light and a second light-emitting layer that emits yellow-green light.

The first light-emitting layer 71 is disposed on the upper side of the first electrode 6, and may be disposed at a distance of 160 nm from the first electrode 6, and the second light-emitting layer 72 is disposed above the first electrode 6. It is disposed on the upper side of the light-emitting layer 71, and may be placed at a distance of 250 nm from the first electrode 6, and the third light-emitting layer 73 is disposed on the upper side of the second light-emitting layer 72, It may be placed at a distance of 260 nm from the first electrode 6. The reason why the positions of the first light-emitting layer 71, the second light-emitting layer 72, and the third light-emitting layer 73 are different from each other is because of the micro cavity characteristics implemented in the display device 1 according to the present application. This is because only the light extraction efficiency of light emitting layers of specific colors arranged at different heights can be improved. A detailed description of this will be provided together with FIGS. 5A to 5C.

The second electrode 8 is provided on the organic light emitting layer (7). Since the second electrode 8 is disposed on the organic light-emitting layer 7, it can be disposed along the profile of the uppermost layer of the organic light-emitting layer 7. Therefore, as shown in FIG. 2, when the organic light-emitting layer 7 is formed to the same thickness along the first electrode pattern (FEP) of the first electrode 6, the second electrode 8 is the organic light-emitting layer ( 7) The layer placed on the upper side. That is, they can be arranged in the same shape along the profile of the second electron transport layer (ETL2). As a result, the second electrode 8 may include a second electrode pattern (SEP) of the same shape as the first electrode pattern (FEP).

The second electrode pattern (SEP) is used to refract some of the light emitted from the organic emission layer 7 and emit it toward the center of the first sub-pixel 21. The second electrode pattern (SEP) according to one example may be formed by depositing the second electrode 8 along the profile of the organic emission layer 7, as described above. Unlike the first electrode pattern (FEP), the second electrode pattern (SEP) cannot be formed after removing a portion of the organic light-emitting layer using a lift-off or dry etching process, etc. This is because if the organic light emitting layer is removed, light may not be emitted even if an electric field is formed between the first electrode and the second electrode. Therefore, the second electrode pattern (SEP) cannot help but be formed along the profile of the organic light-emitting layer (7). A detailed description of the second electrode pattern (SEP) will be described again along with the reflector 4 and the first electrode pattern (FEP) after explaining the encapsulation layer 9.

The second electrode 8 according to one example is a common layer commonly formed in the first sub-pixel 21, the second sub-pixel, and the bank B. The second electrode 8 is made of a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO that can transmit light, or magnesium (Mg), silver (Ag), or magnesium (Mg) and silver (ag). It can be formed of a semi-transmissive conductive material such as an alloy. The display device 1 according to an embodiment of the present application is the distance between the reflector 4 and the second electrode 8. That is, since the micro cavity characteristic is implemented using the resonance distance, the second electrode 8 can be made of a translucent metal material to reflect light. An encapsulation layer 9 may be formed on the second electrode 8.

The micro cavity characteristic is such that when the distance between the reflector 4 and the second electrode 8 becomes an integer multiple of the half wavelength (λ/2) of the light emitted from the sub-pixel, constructive interference occurs and the light is amplified. When the reflection and re-reflection process is repeated between the reflector 4 and the second electrode 8, the degree to which light is amplified continues to increase, thereby improving the external extraction efficiency of light.

The encapsulation layer 9 serves to prevent oxygen or moisture from penetrating into the organic light emitting layer 7 and the second electrode 8. To this end, the encapsulation layer 9 may include at least one inorganic layer and at least one organic layer.

For example, the encapsulation layer 9 may include a first inorganic layer, an organic layer, and a second inorganic layer. In this case, the first inorganic film is formed to cover the second electrode 8. The organic film is formed to cover the first inorganic film. The organic layer is preferably formed with a sufficient length to prevent particles from penetrating the first inorganic layer and entering the organic light-emitting layer 7 and the second electrode 8. The second inorganic film is formed to cover the organic film.

In FIG. 2, for convenience of explanation, only the encapsulation layer 9 disposed on the second electrode 8 is shown. When the organic light emitting device includes only a white organic light emitting device, red, green, and blue color filters to implement red, green, and blue colors may be disposed on the encapsulation layer 9. At this time, a black matrix (BM) may be disposed between the color filters to partition the color filters. However, as described above, if the efficiency of light extraction of a specific color can be improved, as in the display device 1 according to an embodiment of the present application, a color filter may not be disposed on the encapsulation layer 9.

Referring to FIGS. 2 and 4 , the pattern P is used to reflect or refract some of the light emitted from the organic light emitting layer 7 or to increase the light emitting area of the sub-pixel. The pattern P may be disposed on at least one of the reflector 4, the first electrode 6, and the second electrode 8.

The pattern P may be formed in the form of a concave groove in a first direction (DR1, shown in FIG. 2) from the second electrode 8 toward the reflector 4. Additionally, the width PW of the pattern P may become narrower in the first direction DR1. Therefore, as shown in FIG. 2, the pattern P may be provided in a trapezoidal shape with a width narrower on the lower side than on the upper side. However, it is not necessarily limited to this, and as long as some of the light emitted from the organic light emitting layer 7 can be reflected only toward the first sub-pixel 21 and not toward the adjacent sub-pixels, such as the reflection pattern RP formed on the reflector 4. It may be provided in other forms.

The pattern (P) formed on the reflector 4 is the above-described reflection pattern (RP), and the pattern (P) formed on the first electrode 6 is the above-described first electrode pattern (FEP), and the pattern (P) is formed on the first electrode 6. (P) formed on the second electrode 8 is the above-described second electrode pattern SEP.

As described above, since the reflection pattern RP reflects light toward the center of the first sub-pixel 21, it can prevent light from being emitted to adjacent sub-pixels, thereby preventing color mixing. The luminous efficiency of one sub-pixel 21 can be improved.

Since the first electrode pattern (FEP) is formed in a groove shape, the contact area in contact with the organic light emitting layer 7 can be increased compared to the case where the first electrode pattern (FEP) is in a '-' shape rather than a groove shape. When the contact area between the first electrode pattern (FEP) and the organic light emitting layer 7 increases, the electric field formation area with the second electrode 8 increases. In other words, luminous efficiency can be improved because the luminous area is increased. As a result, the light emitting area is proportional to the number of first electrode patterns (FEP), and as the light emitting area increases, the light emitting efficiency can be further improved.

Since the second electrode pattern (SEP) refracts light toward the center of the first sub-pixel 21, it can prevent light from being emitted to adjacent sub-pixels, thereby preventing color mixing from occurring, and the first sub-pixel ( 21) The luminous efficiency can be improved.

Meanwhile, the second electrode pattern (SEP) may be spaced apart from the first electrode pattern (FEP) at the same distance to stably form an electric field. That is, the second electrode pattern (SEP) may be formed identically to the profile of the first electrode pattern (FEP). When an electric field is stably formed between the second electrode pattern (SEP) and the first electrode pattern (FEP), light can be emitted uniformly throughout the sub-pixel.

At least one pattern P may be formed in each of a plurality of sub-pixels. When one or more reflection patterns (RP) and one or more second electrode patterns (SEP) are formed, luminous efficiency can be improved while preventing color mixing between sub-pixels, and one or more first electrode patterns (FEP) are formed. When this happens, the light emitting area can be increased and the light emitting efficiency can be improved. For example, as shown in FIG. 2, two reflection patterns (RP), two first electrode patterns (FEP), and two second electrode patterns (SEP) may be formed in the first sub-pixel 21. , but is not limited thereto, and three or more reflection patterns (RP), the first electrode pattern (FEP), and the second electrode pattern (SEP) may each be formed.

Referring to FIGS. 2 to 5C , the display device 1 according to an embodiment of the present application may have the reflection pattern RP and the second electrode pattern SEP in the same shape. Here, the fact that the shape of the reflection pattern (RP) and the second electrode pattern (SEP) are the same means not only the shape formed as a groove, but also the position arranged up and down with respect to FIG. 4, and the period (RPP) of the reflection pattern (RP) , shown in FIG. 4) and the period (SEPP, shown in FIG. 4) of the second electrode pattern (SEP) may be the same. Therefore, as shown in FIG. 4, the display device 1 according to an embodiment of the present application has the reflection pattern (RP) and the second electrode pattern (SEP) in the form of grooves having the same period at the same upper and lower positions. It can be provided.

The reflection pattern (RP) and the second electrode pattern (SEP) may be spaced apart from each other by the same distance. For example, as shown in FIG. 2, the reflection pattern RP and the second electrode pattern SEP may be arranged to have a first separation distance D1. As the reflection pattern (RP) and the second electrode pattern (SEP) are equally spaced apart by the first separation distance (D1), the resonance distance between the reflection pattern (RP) and the second electrode pattern (SEP) is the same. can be formed, and the light extraction efficiency of any one of the first light-emitting layer 71, the second light-emitting layer 72, and the third light-emitting layer 73 constituting the organic light-emitting layer 7 can be improved.

As shown in FIG. 4, the light extraction efficiency is determined by the thickness (SDLT) of the second insulating layer 5, the period (RPP) of the reflection pattern (RP), the depth (RPD) of the reflection pattern (RP), and the sub It may appear differently depending on the width (EAW) of the pixel's emission area.

When described in detail with reference to FIGS. 5A to 5C, FIG. 5A shows the wavelength and light intensity according to the depth (RPD) of the reflection pattern (RP) in the red sub-pixel, where the horizontal axis represents the wavelength. , and the vertical axis represents the light intensity. 5A, the thickness (SDLT) of the second insulating layer 5 is 200 nm, the period (RPP) of the reflection pattern (RP) is 750 nm, and the width (EAW) of the emission area of the sub-pixel is 250 nm. It is fixed to . In this state, as shown in the upper right corner of FIG. 5A, the wavelength and light intensity change as the depth (RPD) of the reflection pattern (RP) varies from 0 nm, 30 nm, 50 nm, 70 nm, and 90 nm. Here, the graph where the depth (RPD) of the reflection pattern (RP) is 0 nm is a thick solid line, the graph at 30 nm is a dashed line, the graph at 50 nm is a dashed line, the graph at 70 nm is a dotted line, and the graph at 90 nm is a dashed line. The graph is a thin solid line. In Figure 5a, a thick solid line with a depth (RPD) of the reflection pattern (RP) of 0 nm is indicated as L1, and a dotted line with a depth (RPD) of the reflection pattern (RP) of 70 nm is indicated as L2. Although not shown, since the depth (RPD) of the reflection pattern (RP) in L1 is 0 nm, unlike FIG. 4, there is no reflection pattern (RP) and the reflector 4 can be provided in a flat form. Since the depth (RPD) of the reflection pattern (RP) in L2 is 70 nm, it may be provided in the form of a groove in which the depth (RPD) of the reflection pattern (RP) in FIG. 4 is 70 nm. Referring again to FIG. 5A, L1 has a light intensity of about 0.2 when the wavelength is about 0.63 um. On the other hand, L2 has a light intensity of about 0.56 when the wavelength is about 0.62 um. In other words, it can be seen that the light intensity of L2 is higher than that of L1 at almost the same wavelength. In addition, it can be seen that the light intensity of L2 is the highest compared to the light intensity when the depth (RPD) of the reflection pattern (RP) is provided at 30 nm, 50 nm, and 90 nm. Accordingly, the display device 1 according to an embodiment of the present application has a depth (RPD) of the reflection pattern (RP) of 70 nm as in L2 in the red sub-pixel, so that the display device 1 is spaced 250 nm apart from the first electrode 6. The light intensity of the second light emitting layer 72 disposed at the desired position, that is, the red light extraction efficiency, may be provided to be the highest.

Next, Figure 5b shows the wavelength (Wavelength) and light intensity (Intensity) according to the depth (RPD) of the reflection pattern (RP) in the green sub-pixel, where the horizontal axis represents the wavelength and the vertical axis represents the light intensity. And, in Figure 5b, the thickness (SDLT) of the second insulating layer 5 is 100 nm, the period (RPP) of the reflection pattern (RP) is 450 nm, and the width (EAW) of the emission area of the sub-pixel is 260 nm. It is fixed to . In this state, as shown in the upper right corner of FIG. 5B, the wavelength and light intensity change as the depth (RPD) of the reflection pattern (RP) varies from 0 nm, 30 nm, 50 nm, 70 nm, and 90 nm. Here, the graph where the depth (RPD) of the reflection pattern (RP) is 0 nm is a thick solid line, the graph at 30 nm is a dashed line, the graph at 50 nm is a dashed line, the graph at 70 nm is a dotted line, and the graph at 90 nm is a dashed line. The graph is a thin solid line. In Figure 5b, a thick solid line with a depth (RPD) of the reflection pattern (RP) of 0 nm is indicated as L3, and a dotted line with a depth (RPD) of the reflection pattern (RP) of 30 nm is indicated as L4. Although not shown, since the depth (RPD) of the reflection pattern (RP) in L3 is 0 nm, unlike FIG. 4, there is no reflection pattern (RP) and the reflector 4 can be provided in a flat form. Since the depth (RPD) of the reflection pattern (RP) of L4 is 30 nm, it may be provided in the form of a groove in which the depth (RPD) of the reflection pattern (RP) in FIG. 4 is 30 nm. Referring again to FIG. 5B, the light intensity of L3 is about 0.34 when the wavelength is about 0.53 um. On the other hand, L4 has a light intensity of about 0.62 when the wavelength is about 0.53 um. In other words, it can be seen that the light intensity of L4 is higher than that of L3 at almost the same wavelength. In addition, it can be seen that the light intensity of L4 is the highest compared to the light intensity when the depth (RPD) of the reflection pattern (RP) is provided at 30 nm, 50 nm, and 90 nm. Therefore, the display device 1 according to an embodiment of the present application has a depth (RPD) of the reflection pattern (RP) of 30 nm as in L4 in the green sub-pixel, thereby being spaced 260 nm apart from the first electrode 6. The light intensity of the third light emitting layer 73 disposed at the desired position, that is, the green light extraction efficiency, may be provided to be the highest.

Next, Figure 5c shows the wavelength (Wavelength) and light intensity (Intensity) according to the depth (RPD) of the reflection pattern (RP) in the blue sub-pixel, where the horizontal axis represents the wavelength and the vertical axis represents the light intensity. And, in Figure 5c, the thickness (SDLT) of the second insulating layer 5 is 0 nm, the period (RPP) of the reflection pattern (RP) is 400 nm, and the width (EAW) of the emission area of the sub-pixel is 160 nm. It is fixed to . In this state, as shown in the upper right corner of FIG. 5C, the wavelength and light intensity change as the depth (RPD) of the reflection pattern (RP) varies from 0 nm, 30 nm, 50 nm, 70 nm, and 90 nm. Here, the graph where the depth (RPD) of the reflection pattern (RP) is 0 nm is a thick solid line, the graph at 30 nm is a dashed line, the graph at 50 nm is a dashed line, the graph at 70 nm is a dotted line, and the graph at 90 nm is a dashed line. The graph is a thin solid line. In Figure 5c, a thick solid line with a depth (RPD) of the reflection pattern (RP) of 0 nm is indicated as L5, and a dotted line with a depth (RPD) of the reflection pattern (RP) of 30 nm is indicated as L6. Although not shown, since the depth (RPD) of the reflection pattern (RP) in L5 is 0 nm, unlike FIG. 4, there is no reflection pattern (RP) and the reflector 4 may be provided in a flat form. Since the depth (RPD) of the reflection pattern (RP) of L6 is 30 nm, it may be provided in the form of a groove where the depth (RPD) of the reflection pattern (RP) is 30 nm in FIG. 4. Referring again to FIG. 5C, the light intensity of L6 is about 0.29 when the wavelength is about 0.46 um. On the other hand, L5 has a light intensity of about 0.5 when the wavelength is about 0.47 um. In other words, it can be seen that the light intensity of L5 is higher than that of L6 at almost the same wavelength. In addition, it can be seen that the light intensity of L5 is the highest compared to the light intensity when the reflection pattern (RP) has a depth (RPD) of 30 nm, 50 nm, and 90 nm. Therefore, the display device 1 according to an embodiment of the present application has a depth (RPD) of the reflection pattern (RP) of 0 nm as in L5 in the blue sub-pixel, thereby being spaced 160 nm away from the first electrode 6. The light intensity of the first light emitting layer 71 disposed at the desired position, that is, the blue light extraction efficiency, may be provided to be the highest.

As a result, the display device 1 according to an embodiment of the present application has different depths (RPD) of the reflection patterns (RP) of the red sub-pixel, green sub-pixel, and blue sub-pixel, so that each sub-pixel The light extraction efficiency of the matching color can be increased. For example, in the red sub-pixel, the depth (RPD) of the reflection pattern (RP) can be set to 70 nm to increase the red light extraction efficiency of the second light-emitting layer 72 disposed in the middle of the organic light-emitting layer 7, and the green sub-pixel can have a depth (RPD) of 70 nm. In the pixel, the green light extraction efficiency of the third light-emitting layer 73 disposed on the uppermost side of the organic light-emitting layer 7 can be increased by providing a depth (RPD) of 30 nm, and the blue sub-pixel has a reflection pattern (RP) of 30 nm. By setting the depth (RPD) of the pattern (RP) to 0 nm, the blue light extraction efficiency of the first light emitting layer 71 disposed at the bottom of the organic light emitting layer 7 can be increased. In the blue sub-pixel, since the depth (RPD) of the reflection pattern (RP) is 0 nm, the reflection plate (4) can be provided in a flat form without the reflection pattern (RP).

Figure 6 is a schematic cross-sectional view of a display device according to a second embodiment of the present application.

Referring to FIG. 6, the display device 1 according to the second embodiment of the present application is the same as the display device according to FIG. 2 described above, except that the reflection pattern RP is not provided on the reflector 4. . That is, except for the reflector 4, the first electrode pattern (FEP) and the second electrode pattern (SEP) of the display device 1 according to the second embodiment of the present application may have the same shape. Accordingly, the same reference numerals are assigned to the same components, and only the different components will be described below.

In the case of the display device according to FIG. 2 described above, the red sub-pixel and the green sub-pixel are provided with reflection patterns (RP), thereby improving the light extraction efficiency of red light from the red sub-pixel, and light extraction of green light from the green sub-pixel. Efficiency can be increased. However, in order to increase the efficiency of light extraction of a specific color, it is important that the resonance distance between the reflector 4 and the second electrode 8 is maintained the same. This is because if the resonance distance between the reflector 4 and the second electrode 8 is broken, the micro cavity characteristic is not realized, making it impossible to extract light of a specific color. In the case of the display device according to FIG. 2, since the reflection pattern (RP) and the second electrode pattern (SEP) are formed on the reflector 4 and the second electrode 8, respectively, the reflection pattern (RP) and the second electrode pattern If the position of (SEP) is misaligned or the period (RPP) of the reflection pattern (RP) and the period (SEPP) of the second electrode pattern (SEP) are different, the resonance distance may vary, making it impossible to extract light of a specific color. As a result, in the case of the display device of FIG. 2, factors that can destroy the micro cavity characteristics exist in both the reflector 4 and the second electrode 8.

In contrast, in the case of the display device according to the second embodiment of FIG. 6, only the second electrode 8 is provided with the second electrode pattern (SEP), and the reflector 4 is not provided with the reflection pattern RP. It is flat. Accordingly, since the factors that can destroy the micro cavity characteristics are located only on the second electrode 8, it is possible to extract light of a specific color more stably than the display device of FIG. 2.

As a result, the display device 1 according to the second embodiment of the present application has a second electrode pattern (SEP) only on the second electrode 8 and does not have a reflection pattern (RP) on the reflector 4. As a result, compared to the display device of FIG. 2 described above, factors that can destroy the micro cavity characteristics can be reduced and the light extraction efficiency of a specific color can be stably improved.

Figure 7 is a schematic cross-sectional view of a display device according to a third embodiment of the present application.

Referring to FIG. 7, in the display device 1 according to the third embodiment of the present application, the second electrode 8 is not provided with a second electrode pattern (SEP), and the first electrode 6 is provided with a first electrode. It is the same as the display device according to FIG. 2 described above, except that the pattern (FEP) is not provided. That is, the display device 1 according to the third embodiment of the present application may be provided with a reflection pattern RP only on the reflector 4. Accordingly, the same reference numerals are assigned to the same components, and only the different components will be described below.

In the case of the display device according to FIG. 2 described above, the red sub-pixel and the green sub-pixel are provided with reflection patterns (RP), thereby improving the light extraction efficiency of red light from the red sub-pixel, and light extraction of green light from the green sub-pixel. Efficiency can be increased. However, in order to increase the efficiency of light extraction of a specific color, it is important that the resonance distance between the reflector 4 and the second electrode 8 is maintained the same. This is because if the resonance distance between the reflector 4 and the second electrode 8 is broken, the micro cavity characteristic is not realized, making it impossible to extract light of a specific color. In the case of the display device according to FIG. 2, since the reflection pattern (RP) and the second electrode pattern (SEP) are formed on the reflector 4 and the second electrode 8, respectively, the reflection pattern (RP) and the second electrode pattern If the position of (SEP) is misaligned or the period (RPP) of the reflection pattern (RP) and the period (SEPP) of the second electrode pattern (SEP) are different, the resonance distance may vary, making it impossible to extract light of a specific color. As a result, in the case of the display device of FIG. 2, factors that can destroy the micro cavity characteristics exist in both the reflector 4 and the second electrode 8.

In contrast, in the case of the display device according to the third embodiment of FIG. 7, only the reflector 4 is provided with the reflection pattern RP, and the second electrode 8 is not provided with the second electrode pattern SEP. It is flat. Therefore, since the factors that can destroy the micro cavity characteristics are only on the reflector 4 side, it is possible to stably extract light of a specific color compared to the display device of FIG. 2.

In the case of the display device of FIG. 7, since there is no first electrode pattern (FEP) on the first electrode 6, the gap between the flatly formed second electrode 8 and the first electrode 6 can be made the same without difficulty. It can be implemented easily. On the other hand, in the case of the display device of FIG. 2 and the sixth display device, since the first electrode 6 has the first electrode pattern (FEP), the organic light emitting layer 7 includes the first electrode pattern (FEP). It is formed along the profile of the first electrode 6, and the second electrode 8 is formed along the profile of the organic light-emitting layer 7. Accordingly, the shape of the second electrode pattern (SEP) formed on the second electrode 8 is determined by the first electrode pattern (FEP) of the first electrode 6 and the profile of the organic light emitting layer 7, so that the first electrode pattern (SEP) It is more difficult to achieve the same spacing between the electrode 6 and the second electrode 8. Since the gap between the first electrode 6 and the second electrode 8 is included in the resonance distance, if the gap between the first electrode 6 and the second electrode 8 is not the same, the micro cavity characteristic will not be implemented. Therefore, extraction of light of a specific color may become impossible. Accordingly, the display device according to FIG. 7 can more stably extract light of a specific color than the display device according to FIG. 2 and the display device according to FIG. 6.

As a result, the display device 1 according to the third embodiment of the present application has a reflection pattern RP only on the reflector 4, and a first electrode pattern on the first electrode 6 and the second electrode 8. By not providing the (FEP) and the second electrode pattern (SEP), factors that may break the micro cavity characteristics are reduced compared to the display device of FIG. 2 and the display device of FIG. 6, thereby stably producing light of a specific color. Extraction efficiency can be improved.

Figure 8 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present application.

Referring to FIG. 8, the display device 1 according to the fourth embodiment of the present application has the display according to FIG. 2 described above, except that the shape of the reflection pattern (RP) and the second electrode pattern (SEP) are different from each other. Same as device. Accordingly, the same reference numerals are assigned to the same components, and only the different components will be described below.

In the case of the display device according to FIG. 2 described above, the reflection pattern (RP), the first electrode pattern (FEP), and the second electrode pattern (SEP) have the same shape, thereby preventing color mixing and improving light extraction efficiency of a specific color. can be improved. As described above, the same shape means not only the shape formed by the groove, but also the position arranged up and down with respect to FIG. 4, and the period (RPP) of the reflection pattern (RP) and the period of the second electrode pattern (SEP) (SEPP) may mean the same thing.

On the other hand, in the case of the display device according to FIG. 8, the shapes of the reflection pattern (RP) and the second electrode pattern (SEP) are different from each other, and the shapes of the second electrode pattern (SEP) and the first electrode pattern (FEP) are different from each other. same. As described above, the second electrode pattern (SEP) cannot be removed by etching the organic light emitting layer 7, so it has no choice but to be formed along the profiles of the first electrode pattern (FEP) and the organic light emitting layer 7. Therefore, the second electrode pattern (SEP) has the same vertical position and period as the first electrode pattern (FEP).

On the other hand, since the reflection pattern RP can be formed by patterning the first insulating layer 3, it may have a different shape from the second electrode pattern SEP. Here, different shapes may mean not only different groove shapes but also different periods. If the period is different, the positions arranged up and down with respect to FIG. 4 may vary. Therefore, like the display device according to FIG. 8, the period (RPP) of the reflection pattern (RP) and the period (SEPP) of the second electrode pattern (SEP) are different from each other, and accordingly, the position of the reflection pattern (RP) and the period (SEPP) of the second electrode pattern (SEP) are different from each other. The positions of the electrode patterns (SEP) may be provided differently. Therefore, in the case of the display device according to FIG. 8, two different resonance distances may be provided between the reflector 4 and the second electrode 8. For example, as shown in FIG. 8, the resonance distance is a second separation distance D2 that is short between the reflector 4 and the second electrode 8, and a second separation distance that is longer than the second separation distance D2. It can be provided with a separation distance of 3 (D3).

The display device 1 according to the fourth embodiment of the present application has a resonance distance of a second separation distance D2 and a third separation distance D3, so that the display device 1 is arranged at different positions in the organic light emitting layer 7. The light extraction efficiency of at least two of the first light-emitting layer 71, the second light-emitting layer 72, and the third light-emitting layer 73 may be improved simultaneously. For example, as shown in FIG. 8, the light extraction efficiency of blue light or green light can be improved at the second separation distance D2, where the resonance distance is short, and the light extraction efficiency of red light can be improved at the third separation distance D3, where the resonance distance is long. This can be improved.

As a result, the display device according to the one, second, and third embodiments of the present application can improve the light extraction efficiency of only one specific color in one sub-pixel, while the display device according to the fourth embodiment of the present application can improve the light extraction efficiency of only one specific color in one sub-pixel. The display device according to the example can improve light extraction efficiency of two or more different colors in one sub-pixel.

The display device 1 according to the fourth embodiment of the present application improves the light extraction efficiency of two or more different colors in one sub-pixel, and thus has a red sub-pixel that improves light extraction efficiency for only one color, and a green sub-pixel. By applying to the sub-pixel, and the white sub-pixel that emits white light rather than the blue sub-pixel, white light with slightly stronger red and green, white light with slightly stronger green and blue, white light with slightly stronger red and blue, etc. It can be provided so that the color purity of white light can be adjusted in various ways.

Figure 9 is a schematic graph showing the relative period ratio and light efficiency increase rate for red light, green light, and blue light of the display device according to the fourth embodiment of the present application.

Referring to Figure 9, the horizontal axis represents the relative period ratio, and the vertical axis represents the rate of increase in luminous efficiency. The relative period ratio refers to the ratio of the period (SEPP) of the second electrode pattern (SEP) to the period (RPP) of the reflection pattern (RP). The rate of increase in luminous efficiency is the case when there is no reflection pattern on the reflector, there is no first electrode pattern on the first electrode, and there is no second electrode pattern on the second electrode, that is, in a general case where the reflector, first electrode, and second electrode are all flat. It refers to the ratio of increased light efficiency compared to the original light efficiency. In Figure 9, the solid line is a graph for green light, the dashed line is a graph for red light, and the dotted line is a graph for blue light.

As shown in FIG. 9, it can be seen from the red light graph that the light efficiency increase rate is more than 1 when the relative period ratio is 1.1 or more. That is, when the relative period ratio of red light to improve the light extraction efficiency of red light is 1.1 or more, light efficiency can be improved compared to the general case. This means that the period (SEPP) of the second electrode pattern (SEP) is about 1.1 times longer than the period (RPP) of the reflection pattern (RP). As a result, by making the period (SEPP) of the second electrode pattern (SEP) about 1.1 times longer than the period (RPP) of the reflection pattern (RP), it is possible to implement white light with more enhanced red light than in the general case. there is.

Next, in the graph of green light, it can be seen that the light efficiency increase rate is 1 or more when the relative period ratio is 0.9 or more and 1.2 or less, and 1.4 or more and 1.6 or less. That is, when the relative period ratio of green light to improve the light extraction efficiency of green light is 0.9 or more and 1.2 or less, and 1.4 or more and 1.6 or less, light efficiency can be improved compared to the general case. This means that the period (SEPP) of the second electrode pattern (SEP) is 0.9 to less than 1 time shorter than the period (RPP) of the reflection pattern (RP), and the period (SEPP) of the second electrode pattern (SEP) is shorter than the period (RPP) of the reflection pattern (RP). This means that the period (SEPP) of (SEP) is 1 to 1.2 times and 1.4 to 1.6 times longer. As a result, in the green sub-pixel, the period (SEPP) of the second electrode pattern (SEP) is slightly shorter than the period (RPP) of the reflection pattern (RP) to about 0.9 times, the same as 1 time, or 1 to 1.2 times. And by making it 1.4 to 1.6 times longer, it is possible to implement white light with more enhanced green light than in the general case.

Next, in the graph of blue light, it can be seen that the light efficiency increase rate is 1 or more when the relative period ratio is 0.9 or more and 1.25 or less, and 1.35 or more and 1.42 or less. That is, when the relative period ratio of blue light to improve the light extraction efficiency of blue light is 0.9 or more and 1.25 or less, and 1.35 or more and 1.42 or less, light efficiency can be improved compared to the general case. This means that the period (SEPP) of the second electrode pattern (SEP) is 0.9 to less than 1 time shorter than the period (RPP) of the reflection pattern (RP), and the period (SEPP) of the second electrode pattern (SEP) is shorter than the period (RPP) of the reflection pattern (RP). This means that the period (SEPP) of (SEP) is 1 to 1.25 times and 1.35 to 1.42 times longer. As a result, in the blue sub-pixel, the period (SEPP) of the second electrode pattern (SEP) is slightly shorter than the period (RPP) of the reflection pattern (RP) to about 0.9 times, the same as 1 time, or 1 to 1.25 times. And by making it longer from 1.35 times to 1.42 times, it is possible to implement white light with more enhanced blue light than in the general case.

In summary, the display device 1 according to the fourth embodiment of the present application has two different periods (RPP) of the reflection pattern (RP) and different periods (SEPP) of the second electrode pattern (SEP). The light extraction efficiency of the above different colors can be improved, and by adjusting the ratio of the period (SEPP) of the second electrode pattern (SEP) differently compared to the period (RPP) of the reflection pattern (RP), red light, green light , it may be provided to emit white light in which any one color of blue light is more enhanced.

10A to 10C relate to a display device according to a fifth embodiment of the present application, which relates to a head mounted display (HMD) device.

10A to 10C relate to a display device according to another embodiment of the present application, which relates to a head mounted display (HMD) device. FIG. 10A is a schematic perspective view, FIG. 10B is a schematic plan view of a VR (Virtual Reality) structure, and FIG. 10C is a schematic cross-sectional view of an AR (Augmented Reality) structure.

As can be seen in FIG. 10A, the head-mounted display device according to the present invention includes a storage case 10 and a head-mounted band 12.

The storage case 10 stores components such as a display device, a lens array, and an eyepiece lens therein.

The head mounting band 12 is fixed to the storage case 10. The head mounting band 12 is illustrated as being formed to surround the upper surface and both sides of the user's head, but is not limited thereto. The head mounting band 12 is used to secure the head mounted display to the user's head, and can be replaced with a structure in the form of a glasses frame or a helmet.

As can be seen in FIG. 10b, the head-mounted display device 1 with a VR (Virtual Reality) structure according to the present application includes a display device 2a for the left eye, a display device 2b for the right eye, a lens array 11, and a display device 2 for the left eye. It may include an eyepiece lens (20a) and a right eyepiece lens (20b).

The display device 2a for the left eye and the display device 2b for the right eye, the lens array 11, and the left eyepiece 20a and the right eyepiece 20b are stored in the storage case 10 described above. .

The display device 2a for the left eye and the display device 2b for the right eye can display the same image, and in this case, the user can watch the 2D image. Alternatively, the display device 2a for the left eye can display the left eye image and the display device 2b for the right eye can display the right eye image. In this case, the user can view a three-dimensional image. Each of the left-eye display device 2a and the right-eye display device 2b may be a display device according to the above-described FIGS. 1 to 8 . For example, the display device 2a for the left eye and the display device 2b for the right eye may each be an organic light emitting display device.

Each of the left-eye display device 2a and the right-eye display device 2b includes a plurality of sub-pixel areas, a first insulating layer 3, a reflector 4, a second insulating layer 5, and a first electrode 6. ), a bank (B), an organic light emitting layer (7), a second electrode (8), an encapsulation layer (9), and a pattern (P), and the color of light emitted from each sub-pixel area can be changed in various ways. By combining them, various images can be displayed.

The lens array 11 may be provided between the left eyepiece lens 20a and the left eye display device 2a while being spaced apart from each of the left eyepiece lens 20a and the left eye display device 2a. That is, the lens array 11 may be located in front of the left-eye eyepiece 20a and behind the left-eye display device 2a. In addition, the lens array 11 may be provided between the right eyepiece 20b and the right eye display device 2b while being spaced apart from each of the right eyepiece 20b and the right eye display device 2b. there is. That is, the lens array 11 may be located in front of the right eyepiece 20b and behind the right eye display device 2b.

The lens array 11 may be a micro lens array. The lens array 11 can be replaced with a pin hole array. Due to the lens array 11, the image displayed on the left-eye display device 2a or the right-eye display device 2b may be enlarged and visible to the user.

The user's left eye (LE) may be located in the left eyepiece lens 20a, and the user's right eye (RE) may be located in the right eyepiece lens 20b.

As can be seen in FIG. 10C, the head-mounted display device with an AR (Augmented Reality) structure according to the present invention includes a left-eye display device (2a), a lens array (11), a left-eye eyepiece (20a), and a transmission reflector (13). , and a transmission window 14. For convenience, only the left inner configuration is shown in Figure 10c, and the right inner configuration is also the same as the left inner configuration.

The left-eye display device 2a, lens array 11, left eyepiece 20a, transmission reflector 13, and transmission window 14 are stored in the storage case 10 described above.

The left-eye display device 2a may be disposed on one side, for example, on the upper side of the transmission reflection portion 13 without blocking the transmission window 14. Accordingly, the left-eye display device 2a can provide an image to the transparent reflection portion 14 without blocking the external background seen through the transparent window 14.

The display device 2a for the left eye may be made of the electroluminescence display device according to FIGS. 1 to 8 described above. At this time, the upper portion corresponding to the surface on which the image is displayed in FIGS. 1 to 8, for example, the encapsulation layer 9 or the color filter layer (not shown), faces the transmission and reflection portion 13.

The lens array 11 may be provided between the left eyepiece lens 20a and the transmission and reflection unit 13.

The user's left eye is located in the left eyepiece 20a.

The transmission reflector 13 is disposed between the lens array 11 and the transmission window 14. The transmission reflection part 13 may include a reflection surface 13a that transmits part of the light and reflects another part of the light. The reflective surface 13a is formed so that the image displayed on the left-eye display device 2a progresses to the lens array 11. Accordingly, the user can view both the external background and the image displayed by the left eye display device 2a through the transmission layer 14. 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.

The transmission layer 14 is disposed in front of the transmission reflection portion 13.

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is commonly known in the technical field to which this application belongs that various substitutions, modifications, and changes are possible without departing from the technical spirit of the present application. It will be clear to those who have the knowledge of. Therefore, the scope of the present application is indicated by the claims described later, and the meaning and scope of the claims and all changes or modified forms derived from the equivalent concept should be interpreted as being included in the scope of the present application.

1: display device
2: Substrate 3: First insulating layer
4: Reflector 5: Second insulating layer
6: first electrode 7: organic light emitting layer
8: second electrode 9: encapsulation layer
P: Pattern 10: Storage case
11: Lens array 12: Head mounting band

Claims (16)

A substrate having a plurality of sub-pixels;
a first insulating layer provided on the substrate;
a reflector disposed on the first insulating layer;
a second insulating layer disposed on the reflector;
a first electrode disposed on the second insulating layer or the reflector;
An organic light-emitting layer provided on the first electrode;
a second electrode provided on the organic light-emitting layer; and
A pattern for reflecting or refracting some of the light emitted from the organic light-emitting layer or increasing the light-emitting area of the sub-pixel,
The pattern is disposed on at least one of the reflector, the first electrode, and the second electrode,
The pattern is,
A reflective pattern in which the reflector is formed into a groove;
a first electrode pattern in which the first electrode is formed as a groove; and
The second electrode includes a second electrode pattern formed as a groove,
The reflection pattern reflects some of the light emitted from the organic light emitting layer toward the center of the sub-pixel,
The first electrode pattern increases the light emitting area of the sub-pixel,
The second electrode pattern refracts some of the light emitted from the organic emission layer toward the center of the sub-pixel,
The shapes of the reflection pattern and the second electrode pattern are different from each other,
A display device in which a period of the reflection pattern and a period of the second electrode pattern are different from each other. According to claim 1,
A display device in which at least one pattern is formed in each of the plurality of sub-pixels. According to claim 1,
The pattern is formed in the form of a concave groove in a first direction from the second electrode toward the reflector,
A display device in which the width of the pattern becomes narrower in the first direction. According to claim 1,
The organic light emitting layer includes a first light emitting layer that emits blue light, a second light emitting layer that emits red light, and a third light emitting layer that emits green light. delete delete delete According to claim 1,
A display device wherein the first electrode pattern and the second electrode pattern have the same shape. delete delete delete delete According to claim 1,
The organic light-emitting layer includes a first light-emitting layer that emits blue light, a second light-emitting layer that emits red light, and a third light-emitting layer that emits green light,
The reflection pattern and the second electrode pattern are spaced apart from each other at different distances to improve light extraction efficiency of at least two of the first light emitting layer, the second light emitting layer, and the third light emitting layer. According to claim 13,
The ratio of the period of the second electrode pattern to the period of the reflection pattern is the relative period ratio,
A display device in which the relative period ratio of red light is 1.1 or more to improve the light extraction efficiency of red light. According to claim 13,
The ratio of the period of the second electrode pattern to the period of the reflection pattern is the relative period ratio,
A display device in which the relative period ratio of green light to improve the light extraction efficiency of green light is 0.9 or more and 1.2 or less, and 1.4 or more and 1.6 or less. According to claim 13,
The ratio of the period of the second electrode pattern to the period of the reflection pattern is the relative period ratio,
A display device in which the relative period ratio of blue light to improve the light extraction efficiency of blue light is 0.9 or more and 1.25 or less, and 1.35 or more and 1.42 or less.

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