KR101182080B1 - Light Diffusion member - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffusing member used in a liquid crystal display device, which can widen the distance between the lamps and the conventional lamps, thereby significantly reducing the number of lamps, and reducing light emitted from the light source. The light-diffusion member excellent in concealability can be provided while spreading evenly.

Description

Light Diffusion member

The present invention relates to a light diffusing member for use in a liquid crystal display.

As the industrial society develops into an advanced information age, the importance of the electronic display device as a medium for displaying and transmitting various information is increasing day by day. CRT (Cathode Ray Tube), which has been widely used in the past, has limitations due to large installation space, which makes it difficult to increase the size. Therefore, such as liquid crystal display (LCD), plasma display panel (PDP), field emission display (FED) and organic EL It is being replaced by various flat panel display devices. Among such flat panel display devices, in particular, in the case of liquid crystal display devices (LCDs), due to the advantages of thin, light, and low power consumption as a technology-intensive device in which liquid crystal and semiconductor technologies are combined, its structure and manufacturing technology have been researched and developed. In addition to the areas where liquid crystal displays have been widely used, such as notebook computers, desktop computer monitors, and portable personal communication devices (PDAs and mobile phones), large-scale technology is gradually exceeding its limitations. It is being used as a new display device that can replace CRT, which is synonymous with display, as it is applied to large TV of TV.

In the liquid crystal display (LCD) device, since the liquid crystal itself cannot emit light, a separate light source is installed at the rear of the device to adjust the intensity of the passing light through the liquid crystal installed in each pixel to realize contrast. do. In more detail, the liquid crystal display device is a device for controlling the light transmittance by using the electrical properties of the liquid crystal material, the uniformity and the directionality is controlled by passing through various functional prism films or sheets by emitting light from the light source lamp on the back of the device Indirect light-emitting display device that implements an image by passing light through a color filter to realize red, blue, green (R, G, B) colors, and controlling the contrast of each pixel by an electric method As a light emitting device that provides a light source, it is an important component for determining image quality such as brightness and uniformity of a liquid crystal display device.

As the light emitting device, a backlight unit (BLU) is widely used, and in general, light emitted from a plurality of light sources, such as a cold cathode fluorescent lamp (CCFL), is sequentially spread on a diffusion plate, a diffusion sheet, and a prism. A sheet such as a sheet is passed through to reach the liquid crystal panel. Here, the diffusion sheet performs a function of obtaining a uniform light intensity over the entire screen, and at the same time concealing a device such as a light source mounted under the diffusion sheet from the front. The prism sheet, on the other hand, performs an optical path control function for causing the light beams from various directions passing through the diffusion sheet to be converted into a range of viewing angle θ suitable for the viewer to recognize the image.

In the backlight unit, a plurality of sheets are mounted in order to increase the light efficiency in order to reach the liquid crystal panel, but at least the intensity or the number of light sources required affect the brightness. Basically, a plurality of light sources are mounted, but when the distance between the light sources is increased, a dark portion exists between the light source and the light source, that is, there is a problem that concealment is not secured.

However, due to the large number of light sources to be mounted, the power consumption is large and a large amount of heat is generated to not only affect the durability of the seat and the mounting material to be mounted, but also to reduce the cost, it is necessary to reduce the number of light sources.

Therefore, there is a need to develop a member capable of providing luminance and image quality equal to or greater than the luminance before reducing the number of light sources even though the number of the light sources is increased while the distance is increased.

Therefore, an object of the present invention is to provide a light diffusing member that can secure concealment even if the distance between light sources used in the backlight unit is increased.

The present invention is to provide a light diffusing member that can increase the light efficiency to reduce the number of light sources.

In addition, the present invention is to provide a light diffusing member excellent in concealability while spreading the light emitted from the light source evenly.

In a preferred embodiment of the present invention; And it is formed on one side or both sides of the base layer, and provides a light diffusion member comprising a structural layer having a plurality of three-dimensional structure.

In the above embodiment, the structural layer may be a height of the three-dimensional structure is 1/4 to 3/4 with respect to the pitch.

In the above embodiment, the pitch may be 300 μm or less.

In the light diffusing member according to the embodiment, the structure layer is formed on one surface of the substrate layer, and is formed on the other surface of the substrate layer and is formed on the other surface of the structure layer and the bottom layer including the light diffusing particles and the light diffusion. It may further comprise any one or more layers of the surface layer containing the particles.

In the above embodiment, the structural layer may have a three-dimensional structure of a linear arrangement or a non-linear arrangement of a structure selected from polygonal, cone, hemispherical and non-spherical.

The light diffusing member according to the embodiment may be coextruded while the extruded base resin passes through the mold forming the structural layer.

In the above embodiment, the base resin may be a resin in which a polycarbonate resin and a polystyrene resin are mixed at a weight ratio of 1: 9 to 9: 1, polycarbonate resin, polystyrene resin, or methyl methacrylate resin as a base resin. .

The light diffusing member according to the embodiment may include light diffusing particles.

In this embodiment, the light diffusing particles are methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, Acryl-based particles of ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate homopolymer or copolymer, and olefinic particles such as polyethylene, polystyrene, polypropylene, copolymer particles of acryl and olefinic, and Multi-layered multicomponent particles, siloxane polymer particles, tetrafluoroethylene-based particles made of a homopolymer particle and then covered with a different type of monomer on the layer; It may be one or more selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide and magnesium fluoride.

In the above embodiment, 1 to 30 parts by weight of light diffusing particles may be included based on 100 parts by weight of the base resin.

In the light diffusing member according to the embodiment, the Weber fraction (Weber Fraction) of Equation 1 may be 0.7 or less.

&Quot; (1) "

Wherein Lumi. Is Luminescence.

In addition, another preferred embodiment of the present invention includes the light diffusing member, and provides a backlight unit assembly having a distance between 30 and 70 mm between lamp centers in the light source layer.

The backlight unit assembly according to the embodiment may further include one or more of a light diffusion film, a prism film, and a protective film.

The present invention can provide a light diffusion member capable of ensuring concealment by evenly spreading light so that there is no dark portion between the light source and the light source even if the distance between the light source and the light source used in the backlight unit is wider than the conventional one. .

In another aspect, the present invention can provide a light diffusing member that can increase the light efficiency to reduce the number of light sources.

In addition, the present invention can provide a light diffusing member excellent in concealability while spreading the light emitted from the light source evenly.

In addition, the present invention can evenly diffuse the light even if the distance between the light source and the light source used in the backlight unit than the conventional, and can provide a backlight unit assembly that provides a suitable brightness and viewing angle while providing excellent concealment.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional view of a light diffusion member mounted on an upper portion of a light source layer 30 according to a preferred embodiment of the present invention, Figures 2 to 5 are views of the light diffusion member according to another preferred embodiment of the present invention It is a cross section.

In the light diffusing member of the present invention, the structural layer 20 having a plurality of three-dimensional structures is formed on one surface or both surfaces of the substrate layer 10.

Structural layer 20 formed on one surface of the base layer 10 is 1/4 to 3 / with respect to the pitch (a) the height (b) is the average length between the adjacent valleys 25 and 25 It is preferable to include a three-dimensional structure, and by including such a three-dimensional structure, by inducing the refraction of the light at the interface can be covered with the lamp 35 and at the same time diffuse the light effectively. From this, it was found that there is no problem in image evaluation even if the distance d between the center of the lamp 35 is longer than the distance c, that is, the distance d between the centers of the lamp 35 is 30 to 70 mm. The number of (35) can be reduced.

In addition, the pitch (a) is not particularly limited in length, it is preferably 300㎛ or less, which is to prevent the moire phenomenon with the internal structure of the liquid crystal panel and to improve performance as the number of three-dimensional structure increases will be.

The structure layer 20 in the present invention is not particularly limited as long as it satisfies the above conditions, and has a three-dimensional structure of a linear arrangement or a nonlinear arrangement of a structure selected from a polygonal pyramid, a cone, a hemispherical shape, and a non-spherical shape. It may be.

Such a light diffusion member of the present invention may be manufactured by co-extrusion. That is, the molten base resin constituting the base layer 10 and the structural layer 20 may be formed while passing through a pattern roll that is coextruded to form the structural layer. That is, the substrate layer 10 and the structural layer 20 can be simply made of one type of resin without distinction of layers, as shown in the drawings of FIG. 1. The temperature during extrusion varies depending on the base resin, but is preferably extruded at 200 to 300 ° C. In this case, the base resin may be a resin in which a polycarbonate resin and a polystyrene resin are mixed in a weight ratio of 1: 9 to 9: 1, polycarbonate resin, polystyrene resin, methyl methacrylate resin, and the like. As described above, the light diffusing member manufactured by the coextrusion method has a thickness of 500 μm to 2000 μm when considering processability and mechanical strength.

The light diffusing member of the present invention which can be manufactured as described above may include light diffusing particles 15 as shown in the embodiment of FIG. 5. It is preferable to use the particle diameter of 1-50 micrometers as said light-diffusion particle 15, and it is good to contain 1-30 weight part with respect to 100 weight part of said base resins. When the light diffusing particles of such a particle size are included as the content of the above, it may additionally contribute to securing the lamp concealment by the three-dimensional structure through an appropriate light diffusion effect.

As the light diffusing particles, a plurality of organic particles or inorganic particles may be used. Representative organic particles include methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, and ethyl acryl. Acryl-based particles of acrylate, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate homopolymer or copolymer and olefinic particles such as polyethylene, polystyrene, polypropylene, copolymer particles and homopolymers of acryl and olefinic And multi-layered multi-component particles, siloxane-based polymer particles, tetrafluoroethylene-based particles, and the like, which are formed by forming particles of a layer and covered with a monomer of another kind on the layer. Examples of the inorganic particles include silicon oxide, aluminum oxide, and titanium oxide. And zirconium oxide, magnesium fluoride and the like. It will be apparent to those skilled in the art that the organic and inorganic particles are merely exemplary, and are not limited to the particles of the organic or inorganic materials listed above, and may be replaced by other known materials as long as the object of the present invention can be achieved. In addition, such a material change is also within the scope of the technical idea of the present invention.

On the other hand, as shown in Figure 2, the light diffusion member of the present invention may be further formed on the bottom layer 50 on the other surface than the surface on which the structural layer 20 is formed in the base layer 10, this bottom surface Layer 50 may include light diffusing particles 55. The bottom layer 50 may be formed by coextrusion.

When the bottom layer 50 is formed by co-extrusion of the molten base resin, the temperature during extrusion varies depending on the base resin, but is preferably extruded at 200 to 300 ° C. In this case, the base resin may be a resin in which a polycarbonate resin and a polystyrene resin are mixed in a weight ratio of 1: 9 to 9: 1, or a polycarbonate resin, a polystyrene resin, or a methyl methacrylate resin.

The light diffusing particles 55 included in the bottom layer 50 may use organic particles or inorganic particles. For example, the light diffusing particles 55 may be the same as or different from the light diffusing particles that may be included in the base layer 10. .

The bottom layer 50 preferably contains 1 to 30 parts by weight of the light diffusing particles 55 with respect to 100 parts by weight of the binder resin or the base resin, which is advantageous for expression of damage prevention effect and light diffusion. The front luminance is taken into account while not reducing the efficiency.

In addition, as shown in FIG. 3, in the light diffusion member of the present invention, the surface layer 40 may be further formed on a surface other than the surface on which the base layer 10 of the structural layer 20 is formed. ) May include light diffusing particles 45.

The surface layer 40 may also be formed in the same manner as the bottom layer 30, and the included light diffusing particles 45 may be the same as the light diffusing particles that may be included in the base layer 10. It may be something else. The surface layer 40 preferably contains 1 to 30 parts by weight of light-diffusing particles with respect to 100 parts by weight of the base resin, which is advantageous for light diffusion and concealment, and does not reduce the light utilization efficiency while considering forward luminance. will be.

As such, the light diffusing member of the present invention may not include the bottom layer 50 and the surface layer 40, and may optionally include the bottom layer 50 or the surface layer 40, as shown in FIG. 4. Similarly, both the bottom layer 50 and the surface layer 40 may be provided.

The light diffusing member of the present invention is preferably in terms of Weber Fraction of 0.7 below in terms of reducing luminance deviation according to position during image evaluation.

&Quot; (1) "

(Wherein Lumi. Is Luminescence)

The present invention can provide a backlight unit assembly including the light diffusing member described above and one or more of the light diffusing film, the prism film, and the protective film in singular or plural, whereby the film is combined as compared with the case where only the light diffusing member is mounted. In case of using it, it is possible to provide proper brightness while providing excellent lamp hiding property.

In the case of the backlight unit assembly having a conventional 42 ″ 18 lamps, the distance between the lamp centers is about 26 mm. When the light diffusing member of the present invention is applied to the backlight unit, the distance between the lamp centers is 30 mm or more when the backlight unit of the same size is mounted on the backlight unit. Even if it is possible to provide the desired concealability and brightness.

Therefore, when the light diffusing member of the present invention is applied to the backlight unit, even if the number of lamps to be mounted is reduced by increasing the distance between the lamp centers, the light efficiency can be increased while concealing the backlight unit assembly of appropriate brightness and viewing angle. Can provide.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

≪ Example 1 >

400 kg / hr of polystyrene resin (Toyo Styrene, T-080) was put into an extruder with a screw diameter of 120 mm and extruded at 220-240 ° C., and extruded through a pattern roll to form a lenticular lens-like three-dimensional structure. The diffusion member was manufactured. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 100㎛ height, the total thickness was produced to 1500㎛.

<Example 2>

400 kg / hr of polystyrene resin (Toyo Styrene, T-080) was put into an extruder with a screw diameter of 120 mm and extruded at 220-240 ° C., and extruded through a pattern roll to form a lenticular lens-like three-dimensional structure. The diffusion member was manufactured. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 70㎛ height, the total thickness was produced to 1500㎛.

<Example 3>

400 kg / hr of polystyrene resin (Toyo Styrene, T-080) was put into an extruder with a screw diameter of 120 mm and extruded at 220-240 ° C., and extruded through a pattern roll to form a lenticular lens-like three-dimensional structure. The diffusion member was manufactured. At this time, a three-dimensional structure with a pitch of 200 μm, a height of 100 μm and a three-dimensional structure with a pitch of 80 μm and a height of 40 μm were repeated, and the total thickness was manufactured to 1500 μm.

<Example 4>

360 kg / hr of polystyrene resin (Toyo Styrene, T-080) was introduced into the main screw diameter 120 mm extruder, and light diffusible particles per 40 kg / hr of polystyrene resin (Toyo Styrene, T-080) and 100 parts by weight of resin (Sekisui, SBX-12, particle size 10㎛) 10 parts by weight of an extruder with a screw diameter of 65mm was extruded into two layers at 220 ~ 240 ℃, extruded through a pattern roll to form a lenticular lens-like three-dimensional structure To prepare a light diffusion member. The resin and the light diffusing particles of the sub-extruder were adjusted so that the distribution pin was formed so that the bottom layer was formed, such that the bottom layer was 100 µm. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 100㎛ height, the total thickness was produced to 1500㎛.

<Example 5>

360 kg / hr of polystyrene resin (Toyo Styrene, T-080) was introduced into the main screw diameter 120 mm extruder, and light diffusing particles (40 kg / hr of polystyrene resin (Toyo Styrene, T-080) and 100 parts by weight of the resin Sekisui, SBX-12, particle size 10㎛) 10 parts by weight of the extruder with a screw diameter of 65mm was extruded in two layers at 220 ~ 240 ℃, extruded through a pattern roll to form a lenticular lens-like three-dimensional structure The light diffusing member was manufactured. The resin and the light diffusing particles of the sub-extruder were adjusted to adjust the distribution pins so that the surface layer was formed, so that the surface layer was 100 μm. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 100㎛ height, the total thickness was produced to 1500㎛.

<Example 6>

320 kg / hr of polystyrene resin (Toyo Styrene, T-080) was introduced into the main screw diameter 120 mm extruder, and light diffusing particles (80 kg / hr of polystyrene resin (Toyo Styrene, T-080) and 100 parts by weight of the resin were added. Sekisui, SBX-12, particle size 10㎛) 10 parts by weight of the extruder with a screw diameter of 65mm was extruded in three layers at 220 ~ 240 ℃, and extruded through a pattern roll to form a lenticular lens-like three-dimensional structure The light diffusing member was manufactured. The resin and the light-diffusing particles of the sub-extruder were prepared by adjusting the distribution pins so that the surface layer and the bottom layer were formed so that the surface layer and the bottom layer were each 100 μm. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 100㎛ height, the total thickness was produced to 1500㎛.

&Lt; Example 7 >

400 kg / hr of polystyrene resin (Toyo Styrene, T-080) and 10 parts by weight of light-diffusing particles (Sekisui, SBX-12, particle size 10 μm) were added to an extruder with a screw diameter of 120 mm. Extruded at 220 ~ 240 ℃, it was extruded through a pattern roll to form a three-dimensional structure of the lenticular lens shape to prepare a light diffusion member. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 70㎛ height, the total thickness was produced to 1500㎛.

&Lt; Example 8 >

400 kg / hr of polystyrene resin (Toyo Styrene, T-080) was put into an extruder with a screw diameter of 120 mm and extruded at 220-240 ° C., and extruded through a pattern roll to form a lenticular lens-like three-dimensional structure. The diffusion member was manufactured. At this time, the pitch of the three-dimensional structure was prepared to 200㎛, 40㎛ height, the total thickness was produced to 1500㎛.

&Lt; Comparative Example 1 &

The existing Normal Light Diffusion Plate (KOLON, DP421) was prepared.

Table 1 shows the results of laminating two diffusion films (KOLON, LD613) on the light diffusing plate in the above Examples and Comparative Examples and evaluating the physical properties thereof.

(1) lamp concealment

The luminance measuring device (Minolta, CA-2000) measures the luminescence of only 18 lamps (for Woori ETI, TV) itself, and the diffusion plates according to Example 1 and Comparative Example 1 are laminated on the 18 lamps. After luminescence was measured and shown in FIG.

After laminating the diffusion plate according to Example 1 on an 18 lamp, the luminescence was measured by a luminance measuring device (Minolta, CA-2000) and shown in FIG. 7.

Meanwhile, all sheets except the reflective sheet in the backlight unit (BLU, 32 inches) are removed and measured at 1mm intervals from the top direction to the bottom direction with respect to the BLU horizontal center to determine the difference between the highest and lowest luminance values. The Weber Fraction (%) value expressed as a percentage divided by the value was calculated by the following Equation 1, and the brightness was measured using the CA-2000 of Minolta. This value was used as a value indicating the lamp hiding property of the optical member manufactured by the above Examples and Comparative Examples, the lower the value is, the better the hiding property.

&Quot; (1) &quot;

Wherein Lumi. Is Luminescence.

(2) luminance evaluation

Two diffuser films were laminated on each light diffusing member of the Examples and Comparative Examples on a light source layer having a distance of 40 mm between the lamp centers of the 42 ″ backlight unit assembly and using a luminance meter (model name: BM-7, TOPCON, Japan). Luminance at any of 13 points was measured, and the average value thereof was obtained and evaluated.

(3) image evaluation

Laminating the two light diffusing members and the diffusing film of the Examples and Comparative Examples on a light source layer having a distance of 40 mm between the lamp centers of the 42 ″ backlight unit assembly, and covering the lamps after 30 minutes of operation of the BLU and the panel in the LCM with the panel. Was visually evaluated.

◎: Lamp hiding is very good

○: good lamp hiding

△: slightly less lamp hiding

×: Lamp hiding is very poor

division Lamp concealment
(% Webber) Luminance evaluation
(cd / ㎡) Image evaluation Example 1 0.65 9155 ○ Example 2 0.69 9013 ○ Example 3 0.62 9210 ○ Example 4 0.49 9211 ◎ Example 5 0.57 9049 ○ Example 6 0.53 9127 ◎ Example 7 0.51 9188 ◎ Example 8 0.74 8998 △ Comparative Example 1 0.82 8548 ×

As a result of the physical property evaluation, the distance between the centers of the lamps of the backlight unit assembly, such as 42 ″ 18 lamps, was about 26 mm. The brightness was excellent, which was significantly better than that of Comparative Example 1, which is a light diffusing plate without a three-dimensional structure, and the image evaluation results showed a marked improvement.

1 is a cross-sectional view of a light diffusing member mounted on an upper portion of a light source layer according to a preferred embodiment of the present invention;

2 to 5 are cross-sectional views of the light diffusing member according to another preferred embodiment of the present invention,

FIG. 6 shows the concealment tendency by measuring the luminescence with a luminance measuring device (Minolta, CA-2000) after stacking the 18-lamp lamp itself and the diffusion plate according to Example 1 and Comparative Example 1 on the 18-lamp lamp. graph,

FIG. 7 is a graph illustrating a result of measuring luminescence with a luminance measuring device (Minolta, CA-2000) after stacking a diffusion plate according to Example 1 on an 18-lamp lamp.

* Explanation of the symbols of the main parts of the drawings

10: substrate layer 20: structure layer

25: valley 30: light source layer

35 lamp 40 surface layer

45: particle 50: bottom layer

55: Particle 100: Base Resin

Claims (13)

A base layer; A structural layer formed on one surface of the base layer and having a plurality of three-dimensional structures; And As a light diffusing member comprising a bottom layer formed on the other side of the base layer, The base layer, the structure layer and the bottom layer comprises light diffusing particles, The extruded base resin is coextruded while passing through the mold forming the structural layer. The method of claim 1, The structural layer is a light diffusing member, characterized in that the height of the three-dimensional structure is 1/4 to 3/4 with respect to the pitch. The method of claim 2, A light diffusing member, wherein the pitch is 300 µm or less. The method of claim 1, The structural layer is formed on one side of the base layer, And a surface layer formed on the other side of the structure layer and including light diffusing particles. The method of claim 1, The structure layer is a light diffusing member, characterized in that it has a three-dimensional structure of a linear arrangement or a non-linear arrangement of a structure selected from polygonal, cone, hemispherical and non-spherical. delete The method of claim 1, The base resin is a light diffusion member comprising a resin, a polycarbonate resin, a polystyrene resin, or a methyl methacrylate resin in which a polycarbonate resin and a polystyrene resin are mixed at a weight ratio of 1: 9 to 9: 1 as a base resin. delete The method according to claim 1 or 4, The light diffusing particles are methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, iso Acrylic particles of butyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate homopolymer or copolymer and olefin particles such as polyethylene, polystyrene, polypropylene, copolymer particles of acryl and olefin copolymer, and particles of homopolymer Multi-layered multicomponent particles, siloxane polymer particles, tetrafluoroethylene particles, and the like formed on the layer and covered with a monomer of another kind on the layer; And at least one member selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, and magnesium fluoride. The method of claim 9, 1-30 weight part of light-diffusing particles with respect to 100 weight part of base resins, The light-diffusion member characterized by the above-mentioned. The method of claim 1, The web diffusion fraction (Weber Fraction) of the following formula 1 is 0.7 or less, characterized in that. &Quot; (1) &quot;

Wherein Lumi. Is Luminescence. The backlight unit assembly comprising the light diffusing member of claim 1, wherein a distance between lamp centers in the light source layer is 30 to 70 mm. 13. The method of claim 12, And a singular or plural number of one or more of a light diffusion film, a prism film, and a protective film.

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