TW201600888A - Transmissive and reflective optical projection film, manufacturing method and projection screen thereof - Google Patents

Abstract

A transmissive and reflective optical projection film comprises a transparent substrate, a transmissive and reflective layer, a plurality of microlenses and pressure sensitive adhesive. The optical projection film can be flexibly adhered to another planar or non-planar transparent substrate to form a transmissive and reflective optical projection screen.

Description

Penetrating and reflecting optical projection film, manufacturing method thereof and projection screen

The invention relates to a see-through, reflective and adhesive projection film which can be flexibly adhered to a glass to form a projection screen, which can be applied to a head up display (HUD) or an optical head-mounted type. The Optical Head-Mounted Display (OHMD) combines the external scene with the data to be displayed on the projection screen in the same visual image.

Traditionally, projection imaging can be divided into two categories: one, non-transparent projection screens, for example, used in cinemas, conference rooms, and home theaters; and second, perspective projection screens, such as coating on glass substrates, such as for rear projection televisions ( Rear-projection television).

The non-perspective projection screen is formed by adding plastic resin or scattering inorganic particles to an opaque substrate to form an optical scattering structure, so that the projection image is formed on the projection screen to form a high contrast image. The projection light source of the non-perspective projection screen is on the same side as the viewer, so that the projected image is reflected to the viewer by the non-transparent projection screen.

The fluoroscopy projection screen adds plastic resin on a transparent substrate or can produce diffuse particles to form an optical lens structure, and then vacuum-evaporates a highly reflective optical metal film to form a high contrast on the film. Image. Such a product uses an optical vapor deposition method to form an optical metal film, which results in a cumbersome and expensive product manufacturing process, and the optical metal film is plated on the outside of the optical lens structure, which is prone to scratching or peeling. Therefore, at least one additional protective layer needs to be added to resist scratching, thus It may cause the optical quality to drop.

1 is a side elevational view of a conventional perspective projection screen. The see-through projection screen 100 is attached to a glass substrate 110 having a refractive index n1, and a plurality of microlenses 111 having a radius of 625 um and a refractive index of n2 are formed by UV-curing epoxy resin. Then, 40 Å of aluminum thin plating is formed on the surface of the plurality of microlenses 111 by vacuum evaporation to serve as the reflective layer 112. Therefore, the projection screen 100 partially reflects, partially penetrates, and partially absorbs the incident light. The plurality of microlenses 111 and the reflective layer 112 on the glass substrate 110 are encapsulated by using the sealant layer 113 having a refractive index of n2 and another glass substrate 114 having a refractive index of n1 to protect the plurality of microlenses. 111 and reflective layer 112 are protected from being scratched.

When the conventional fluoroscopic projection screen 100 is used for projection imaging, the incident light 115 emitted by the light source is first incident on the glass substrate 114 and the sealant layer 113, and then partially reflected by the surface of the plurality of microlenses 111. 112 reflects and leaves the glass substrate 114, so the brightness of the reflected light 116 emitted by the projection film 100 is reduced by the absorption of the glass substrate 114 and the sealant layer 113, so it is necessary to increase the brightness of the light source to compensate for the absorbed light. And get the desired brightness of the reflection. Alternatively, the reflectivity of the reflective layer 112 can be increased, but at the same time the visibility is reduced. Further, since the see-through projection screen 100 includes the glass substrate 110 and the glass substrate 114, it cannot be used as a flexible projection screen.

Dieter Cuypers, Herbert De Smet, Xavier Hugel, and Guilhem Dubroca et al., in the paper "Projection Technology for Future Airplane Cockpits" (IDW 2012, 19, pp 1995-1998), revealed the use of R, G, B LEDs (Light Emitting Diodes) The three primary colors are projected onto a 3M Vikuiti projection screen. The 3M Vikuiti projection screen is first transferred to a PVC substrate to remove the black ink that blocks the interference of light, and then the microlens made of UV cross-linked cured plastic resin. This completes the main structure of the projection screen. Viewers can see images behind the screen, which is similar to rear projection TV. Japanese Patent Publication No. JP2007-256457A also discloses a similar display screen structure for rear projection.

In addition, the Chinese utility model patent CN202067071U discloses a structure of a projection screen which is adhered to a fine black-grey composite film on a polymer material substrate, and then the film is combined with a black-gray grating composite film. However, these prior techniques are The use of black ink or black film in the structure of the projection screen absorbs some of the light and reduces the brightness of the emitted light.

In summary, some of the foregoing prior art cannot be used for a head-up display or an optical head-mounted display, or the brightness of the emitted light is reduced by the use of a black material in the structural layer, and most of them cannot be flexibly combined with another non-planar transparency. The substrate is bonded. Accordingly, the present invention provides an optical projection film that allows light to penetrate and reflect, not only for a heads-up display or an optical head-mounted display, but also reduces the proportion of light absorbed to enhance the brightness of the emitted light.

The invention provides an optical projection film which can penetrate and reflect light, and comprises a transparent substrate, a penetrable and reflective layer, a plurality of microlenses and a pressure-adhesive glue. The optical projection film is flexibly adhered to a flat or non-planar transparent substrate to form a projection screen, and the external scene and the data to be displayed on the projection screen are combined in the same visual image.

The invention provides an optical projection film capable of penetrating and reflecting light, comprising: a transparent substrate having a first surface and a second surface opposite to the first surface; a penetrable and reflective a layer disposed on the first surface for partially reflecting and partially transmitting light; and a plurality of microlenses disposed on a surface of the penetrable and reflective layer with respect to the transparent substrate.

In an embodiment of the invention, the optical projection film further comprises a pressure-adhesive layer disposed on the second surface, wherein the pressure-adhesive layer partially reflects and partially transmits visible light.

The present invention further provides a method of fabricating an optical projection film that penetrates and reflects light, comprising: providing a transparent substrate having a first surface and a second surface relative to the first surface; coating the penetrable and reflective layer On the first surface; coating the UV resin on the permeable and reflective layer, pressing the template onto the UV cross-linking cured resin to form a plurality of microlens shapes; and curing the UV resin by UV light A plurality of microlenses.

In an embodiment of the invention, the method further comprises the step of applying a pressure-sensitive adhesive to the second surface.

In an embodiment of the invention, the transparent substrate may be a material such as polyester (PET), polynaphthyl ester, polycarbonate, acrylic or polyvinyl chloride.

In an embodiment of the invention, the penetrable and reflective layer is a transparent inorganic film or a metal film, which can be coated by vacuum evaporation or electroless plating, and controlled according to the type of inorganic or metal and the thickness of the film. Reflectivity and transmittance of light.

In an embodiment of the invention, the transparent inorganic thin film is cerium oxide, zirconium oxide, zinc oxide, tungsten oxide, titanium oxide or chromium oxide.

In an embodiment of the invention, the metal film may be aluminum, silver, gold, chromium, cadmium, zinc or zirconium.

In an embodiment of the invention, the microlenses are formed of a UV crosslinked curing resin, wherein the UV crosslinking curing resin is one of an acrylic resin, a carbonate resin or an epoxy resin.

In an embodiment of the invention, the pressure-adhesive layer is an acrylic glue, a polyurethane glue or a silicone rubber.

In an embodiment of the invention, the plurality of microlenses are in the shape of one of a polygon, a circle, and an ellipse or a combination thereof.

In an embodiment of the invention, the plurality of microlenses may be in the shape of one of a hexagon, a rectangle, a diamond, and a triangle, or a combination thereof.

In an embodiment of the invention, the plurality of microlenses comprise inorganic nanoparticles for adjusting mechanical strength, wear resistance and anti-glare of the plurality of microlenses, wherein the inorganic nanoparticles can be oxidized. One of or a combination of cerium, zirconia, zinc oxide, titanium oxide, aluminum oxide or chromium oxide.

100‧‧‧projection film

110‧‧‧Glass substrate

111‧‧‧Microlens

112‧‧‧reflective layer

113‧‧‧ Sealing layer

114‧‧‧ glass substrate

115‧‧‧ incident light

116‧‧‧Reflected light

200, 300, 400, 500, 600, 700‧‧‧ optical projection film

209, 309, 409, 509, 609, 709‧‧ ‧ pressure adhesive layer

210, 310, 410, 510, 610, 710‧‧ ‧ transparent substrate

211, 311, 411, 511, 611, 711‧‧ ‧ microlenses

212, 312, 412, 512, 612, 712‧‧ ‧ reflective layer

1 is a side elevational view of a conventional see-through projection screen 100.

2 is a side elevational view of an embodiment of the present invention.

3 is a side elevational view of an embodiment of the present invention.

4 is a perspective view of an embodiment of the present invention.

Figure 5 is a perspective view of an embodiment of the present invention.

Figure 6 is a perspective view of an embodiment of the present invention.

Figure 7 is a perspective view of an embodiment of the present invention.

Figure 8 is an enlarged view of a hexagonal cylindrical microlens of the present invention.

Figure 9 is an enlarged view of a hemispherical microlens of the present invention.

The disclosure is the best mode for carrying out the invention. The invention has been described herein with reference to various embodiments and drawings. These disclosures are intended to depict the principal principles of the invention and should not be limited. Those skilled in the art will appreciate that various changes and modifications can be made in accordance with the scope of the invention. The scope of the invention should be defined by the scope of the patent application.

In the embodiment, the plurality of microlens structures are formed by first engraving the copper plate using a laser engraving machine to form a plurality of templates of regular hexagonal grooves having a side length of 60 μm, a frame thickness of 20 μm, and a depth of 35 μm. The UV crosslinked cured resin was coated on a transparent substrate by a coater, wherein the thickness of the transparent substrate was 50 μm, and the thickness of the UV crosslinked cured resin was 20-50 μm. Next, the transparent substrate of the UV cross-linking cured resin is embossed on one side of the resin coated with a template having a regular hexagonal groove, and then the embossed is applied to the transparent substrate on the stencil. The UV cross-linking curing resin is cured in a UV curing machine, and after the UV cross-linking curing resin absorbs energy of up to 400 mj/cm ² , the transparent substrate adhered to the template is taken out, and the transparent substrate is separated from the template to obtain An optical projection film of a plurality of hexagonal cylinder microlenses having a side length of about 50 μm and a side width of about 20 μm. It must be noted here that during the UV curing process, the UV cross-linking curing resin is gradually converted into a solid by a liquid, without a specific shape, so that the UV cross-linked curing resin still has the possibility of stretching and moving before being completely cured. The arrangement of the regular hexagons can take advantage of the fact that the hexagonal cylinders are arranged to each other to be closest packed and uniformly distributed on the transparent substrate.

In addition, a plurality of hexagonal cylinder microlens structures were formed on different transparent substrates to fabricate the optical projection films of Examples 1-8 and optical projection films without hexagonal cylinders (Comparative Examples 1, 2) ) Compare its imaging results. However, the present invention is not subject to such For example, the shape of the plurality of microlenses may be one of a polygon, a circle, and an ellipse, or a combination thereof, or may be one of a hexagon, a rectangle, a diamond, and a triangle, or a combination thereof.

An optical projection film (Example 1-8) of a hexagonal cylinder made of a different transparent substrate and a UV crosslinked curing resin, and an optical projection film (Comparative Example 1-2) without a hexagonal column were placed on the projector. Tested in front of 80 cm, the results are shown in Table 1. The contrast ratio at visible light transmittance (VLT) of approximately 46% can reach 13000:1 (Example 3), and clear and bright projection imaging can be obtained by observation both before and after the optical projection film. In the case of a transparent substrate having an aluminized film, the VLT was reduced from 92% to 70%, but the imaging contrast was significantly improved (as compared with Examples 1, 4, and 5 and Example 2). Optical projection films of different VLTs can adjust the transmissive and reflective layers according to the needs of incorporating external scenes into the same visual image without compromising the need for clear and high contrast images.

Figure 2 illustrates a side view of an embodiment of the invention. An optical projection film 200 that allows light to penetrate and reflect light includes a transparent substrate 210, a penetrable and reflective layer 212, a plurality of curved cylindrical microlenses 211, and a pressure-bonding layer 209. The transparent substrate 210 has a first surface and a second surface opposite to the first surface, and the transmissive and reflective layer 212 is disposed on the first surface for partially reflecting and partially transmitting the light. A plurality of arcuate cylinder microlenses 211 are disposed on the surface of the penetrable and reflective layer 212 with respect to the transparent substrate 210, and the pillars are spaced apart from each other by a pitch. The pressure-sensitive adhesive layer 209 is disposed on the second surface and can partially and partially transmit visible light.

The transparent substrate 210 may be a sheet formed of polyester (PET), polynaphthyl ester, polycarbonate, acryl or polyvinyl chloride, and is preferably flexible. The transparent and reflective layer 212 is a transparent inorganic film or a metal film. The film can be plated by vacuum evaporation or electroless plating, and the reflectance and transmittance of the light can be controlled according to the type of inorganic or metal and the thickness of the film. . The transparent inorganic thin film may be formed of cerium oxide, zirconium oxide, zinc oxide, tungsten oxide, titanium oxide or chromium oxide, and the metal thin film may be formed of aluminum, silver, gold, chromium, cadmium, zinc or zirconium.

A plurality of arcuate cylindrical microlenses 211 may be formed by curing a UV crosslinked curing resin, and the microlenses 211 may include inorganic nanoparticles for adjusting mechanical strength, wear resistance and anti-glare of the plurality of microlenses. Light. The UV crosslinking curing resin may be one of an acrylic resin, a carbonate resin or an epoxy resin, and the inorganic nano particles are cerium oxide, zirconium oxide, zinc oxide, titanium oxide, aluminum oxide or chromium oxide. One of them or a combination thereof. The pressure-adhesive layer 209 may be an acrylic glue, a urethane glue or a silicone rubber. The various structural layers of the present invention are not limited by the materials listed in this embodiment.

3 is a side elevational view of another embodiment of the present invention. The optical projection film 300 includes a transparent substrate 310, a penetrable and reflective layer 312, a plurality of hemispheres or semi-ellipsoid microlenses 311, and a pressure-adhesive layer 309. The transparent substrate 310 has a first surface and a second surface opposite to the first surface, and a transmissive and reflective layer 312 is disposed on the first surface for partially reflecting and partially transmitting the light. A plurality of hemispherical or semi-ellipsoidal microlenses 311 are disposed on the surface of the penetrable and reflective layer 312 with respect to the transparent substrate 310, and the spheres are spaced apart from each other by a distance. The pressure-sensitive adhesive layer 309 is disposed on the second surface and can partially and partially transmit visible light. Compared with the microlens 211 in Figure 2 The curved surface cylinder, the microlens 311 in FIG. 3 is a hemisphere or a semi-ellipsoid, but the invention is not limited by the embodiments, that is, the microlens may be a columnar body, a sphere or a protrusion, and the upper surface thereof may be It is a curved surface or a spherical surface.

Similar to the optical projection film 300 of FIG. 3, FIG. 9 shows an optical projection film having a hemispherical microlens, each of which is spaced apart from each other by an optical projection film completed in accordance with the aforementioned manufacturing process.

4 is a perspective view of another embodiment of the present invention. The optical projection film 400 includes a transparent substrate 410, a transparent and reflective layer 412, a plurality of hexagonal cylinder microlenses 411, and a pressure-adhesive layer 409. The transparent substrate 410 has a first surface and a second surface opposite to the first surface, and a transmissive and reflective layer 412 is disposed on the first surface for partially reflecting and partially transmitting the light. A plurality of hexagonal cylinder microlenses 411 are disposed on the surface of the transparent and reflective layer 412 with respect to the transparent substrate 410. The pillars are spaced apart from each other, and the upper surface thereof may be substantially planar or curved. The arrangement of the hexagonal cylinders allows the microlenses to be densely packed, so that the microlenses can be uniformly and closely distributed on the transparent substrate 410. The pressure-sensitive adhesive layer 409 is disposed on the second surface and can partially and partially transmit visible light.

Similar to the optical projection film 400 of FIG. 4, FIG. 8 shows an optical projection film of a hexagonal cylindrical microlens having a curved surface on the upper surface, each column being spaced apart from each other by a pitch according to the aforementioned manufacturing process. Optical projection film.

5 is a perspective view of another embodiment of the present invention. The optical projection film 500 includes a transparent substrate 510, a penetrable and reflective layer 512, a plurality of rectangular cylinders of microlenses 511, and a pressure-adhesive layer 509. The transparent substrate 510 has a first surface and a second surface opposite to the first surface, and a transmissive and reflective layer 512 is disposed on the first surface for partially reflecting and partially transmitting the light. A plurality of rectangular cylinder microlenses 511 are disposed on the surface of the penetrable and reflective layer 512 with respect to the transparent substrate 510. The pillars are spaced apart from each other, and the upper surface thereof may be a substantially planar surface or a curved surface. The pressure-sensitive adhesive layer 509 is disposed on the second surface, wherein the pressure-adhesive layer 509 can partially and partially transmit visible light. The microlens 511 of this embodiment is a rectangular cylinder, and each of the rectangular cylinders may be spaced apart from each other or in contact with each other.

FIG. 6 illustrates another embodiment of the present invention, an optical projection film 600 package A transparent substrate 610, a penetrable and reflective layer 612, a plurality of diamond-shaped microlenses 611, and a pressure-adhesive layer 609. The transparent substrate 610 has a first surface and a second surface opposite to the first surface, and a transmissive and reflective layer 612 is disposed on the first surface for partially reflecting and partially transmitting the light. A plurality of diamond-shaped microlenses 611 are disposed on the surface of the penetrable and reflective layer 612 with respect to the transparent substrate 610. The pillars are spaced apart from each other, and the upper surface thereof may be a substantially planar surface or a curved surface. The pressure-sensitive adhesive layer 609 is disposed on the second surface and can partially and partially transmit visible light. The microlens 611 of this embodiment is a rhombic cylinder, and each of the rectangular cylinders may be spaced apart from each other or in contact with each other.

FIG. 7 illustrates another embodiment of the present invention. The optical projection film 700 includes a transparent substrate 710, a penetrable and reflective layer 712, a plurality of triangular cylinders of microlenses 711, and a pressure-bonding layer 709. The transparent substrate 710 has a first surface and a second surface opposite to the first surface, and a transmissive and reflective layer 712 is disposed on the first surface for partially reflecting and partially transmitting the light. A plurality of triangular cylinder microlenses 711 are disposed on the surface of the transparent and reflective layer 712 with respect to the transparent substrate 710. The pillars are spaced apart from each other, and the upper surface thereof may be substantially planar or curved. The pressure-sensitive adhesive layer 709 is disposed on the second surface and can partially and partially transmit visible light. The microlens 711 of this embodiment is a triangular cylinder, and each of the triangular cylinders may be spaced apart from each other or in contact with each other.

It will be appreciated by those skilled in the art that various modifications and changes can be made in the structure and the process disclosed in the present invention without departing from the scope and spirit of the invention. The present invention is intended to cover modifications and variations of the present invention, which are within the scope of the appended claims.

200‧‧‧ optical projection film

209‧‧‧Adhesive layer

210‧‧‧Transparent substrate

211‧‧‧Microlens

212‧‧‧reflective layer

Claims (24)

A transmissive and reflective optical projection film comprising: a transparent substrate having a first surface and a second surface opposite to the first surface; a penetrable and reflective layer disposed on The first surface is for partially reflecting and partially transmitting visible light; and a plurality of microlenses are disposed on a surface of the transparent and reflective layer on the surface of the transparent and reflective layer. The optical projection film of claim 1, further comprising a pressure-adhesive layer disposed on the second surface, wherein the pressure-sensitive adhesive layer partially and partially transmits visible light. The optical projection film of claim 1, wherein the transparent substrate is polyester, polynaphthyl ester, polycarbonate, acrylic or polyvinyl chloride. The optical projection film of claim 1, wherein the penetrable and reflective layer is a transparent inorganic film or a metal film. The optical projection film of claim 4, wherein the transparent inorganic thin film is cerium oxide, zirconium oxide, zinc oxide, tungsten oxide, titanium oxide or chromium oxide. The optical projection film of claim 4, wherein the metal film is aluminum, silver, gold, chromium, cadmium, zinc or zirconium. The optical projection film of claim 1, wherein the plurality of microlenses are one of a polygonal shape, a circular shape, and an elliptical shape or a combination thereof. The optical projection film of claim 7, wherein the polygon is hexagonal. The optical projection film of claim 1, wherein the microlenses are formed by UV crosslinking curing resin, and the plurality of microlenses further comprise a plurality of inorganic nanoparticles for adjusting the plurality of microlenses Mechanical strength, wear resistance and anti-glare. The optical projection film of claim 9, wherein the UV crosslinking curing resin is one of an acrylic resin, a carbonate resin or an epoxy resin; and the plurality of inorganic nanoparticles are cerium oxide and oxidized Zirconium, zinc oxide, titanium oxide, One or a combination of alumina or chrome oxide. The optical projection film of claim 2, wherein the pressure-adhesive layer is acrylic glue, polyurethane glue or silicone rubber. A method of making a permeable and reflective optical projection film, comprising: providing a transparent substrate having a first surface and a second surface opposite the first surface; Transmitting and reflecting layer on the first surface for partially reflecting and partially transmitting visible light; coating a UV crosslinked curing resin on the penetrable and reflective layer, and pressing a template to the UV crosslinked curing resin Forming a plurality of microlenses to form a plurality of microlenses; and curing the UV crosslinked curing resin by UV light to obtain a plurality of microlenses. The method of claim 12, further comprising the step of applying a pressure-sensitive adhesive to the second surface. The method of claim 12, wherein the transparent substrate is polyester, polynaphthyl ester, polycarbonate, acrylic or polyvinyl chloride. The method of claim 12, wherein the penetrable and reflective layer is a transparent inorganic film or a metal film. The method of claim 15, wherein the transparent inorganic thin film is cerium oxide, zirconium oxide, zinc oxide, tungsten oxide, titanium oxide or chromium oxide. The method of claim 15, wherein the metal film is aluminum, silver, gold, chromium, cadmium, zinc or zirconium. The method of claim 12, wherein the plurality of microlenses are one of a polygonal shape, a circular shape, and an elliptical shape or a combination thereof. The method of claim 18, wherein the polygon is hexagonal. The method of claim 12, wherein the UV crosslinking curing resin comprises a plurality of inorganic nanoparticles for adjusting mechanical strength, abrasion resistance and glare resistance of the plurality of microlenses. The method of claim 20, wherein the UV crosslinking curing resin is one of an acrylic resin, a carbonate resin or an epoxy resin; and the plurality of inorganic nanoparticles are yttria, zirconia , zinc oxide, titanium oxide, One or a combination of alumina or chrome oxide. The method of claim 13, wherein the pressure-sensitive adhesive is one of acrylic glue, polyurethane glue or silicone rubber. The method of claim 13, wherein the template is removed after the step of curing the UV cross-linked curing resin by UV light to obtain a plurality of microlenses. A transmissive and reflective projection screen comprising an optical projection film according to one of claims 1 to 11.