KR20070021376A - Display device and method for manufacturing optical plate adapted in the same - Google Patents

Abstract

Disclosed are a display device capable of reducing manufacturing costs and a method of manufacturing an optical plate applied thereto. The display device includes a display panel and a backlight assembly. The backlight assembly includes a lamp disposed under the display panel to emit light, an optical plate, a diffusion sheet, and a high brightness enhancement film. The optical plate has a light collecting portion formed with a prism pattern having an angle of apex of 40 to 70 degrees, and a diffusion portion formed with a fisheye lens pattern. Accordingly, by integrating the light control function performed by the diffusion sheet, the prism sheet, and the like into a single optical plate, even if the number of optical sheets is reduced, an improved level of luminance can be obtained and manufacturing cost can be reduced.

Lens, fisheye lens, optical plate, diffuser plate, scattering, diffusion, light collecting plate, condensing

Description

DISPLAY DEVICE AND METHOD FOR MANUFACTURING OPTICAL PLATE ADAPTED IN THE SAME}

1 is a perspective view of an optical plate according to a first embodiment of the present invention.

2A to 2C are manufacturing process diagrams of the optical plate shown in FIG. 1.

3 is a cross-sectional view schematically illustrating an optical path of the optical plate shown in FIG. 1.

4 is a perspective view of an optical plate according to a second embodiment of the present invention.

5A to 5C are manufacturing process diagrams of the optical plate shown in FIG. 4.

FIG. 6 is a cross-sectional view schematically illustrating an optical path of the optical plate illustrated in FIG. 4.

7A to 7F are process diagrams illustrating a manufacturing process of the diffusion unit according to the present invention.

8 is an exploded perspective view illustrating a display device having an optical plate according to a first embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100, 200: optical plate 110: light collecting part

112: first flat plate base 114, 214: prism pattern

120, 220: UV curing resin adhesive layer 130, 230: diffusion part

132: second flat plate base portion 134, 234: fisheye lens pattern

150: diffusion sheet 160: high brightness reinforcement film

212: fourth flat plate base portion 232: third flat plate base portion

140, 240a, 240b: air layer

The present invention relates to a display device and a method of manufacturing an optical plate applied thereto, and more particularly, to a display device for reducing manufacturing costs and a method of manufacturing an optical plate applied thereto.

In general, the liquid crystal display (Liquid Crystal Display) is a flat panel display device that displays an image using a liquid crystal (Liquid Crystal), is thinner and lighter than other flat panel display devices, and has a low driving voltage and low power consumption It has advantages and is used extensively throughout the industry.

The liquid crystal display device includes a liquid crystal panel including a thin film transistor (TFT) substrate, a color filter substrate facing the TFT substrate, and a liquid crystal layer interposed between the two substrates to change light transmittance. do. In addition, since the liquid crystal display device is a non-light emitting device which does not emit light by itself, the liquid crystal panel for displaying an image requires a backlight assembly for supplying light to the liquid crystal panel.

The backlight assembly of the liquid crystal display device should be lightweight, thin so as not to affect the thinness of the liquid crystal, and high luminance uniformity. The backlight assembly to be formed to have such characteristics is divided into a direct type where the light source is installed on the bottom of the liquid crystal panel and an edge method where the light source is installed on one side or both sides of the liquid crystal panel.

In general, the backlight assembly includes a lamp for generating light and an optical plate for guiding a path of light generated from the lamp toward a liquid crystal panel.

Further, in order to secure advantages such as improving the brightness of the output light and improving the viewing angle of the output light, various optical sheets such as a diffusion sheet, two prism sheets, and a reflective polarizing film are further included on the exit surface of the optical plate.

In this case, the thickness of the display device is increased as much as the area occupied by the optical sheets, and manufacturing costs are increased by using several optical sheets.

In addition, as the light passes through the media having different refractive indices, there is a problem in that the light source is lost in a large amount and the luminance is lowered.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to integrate the light control function performed by optical sheets into an optical plate, thereby reducing the number of optical sheets and reducing manufacturing costs. The present invention provides a display device for improving luminance.

Another object of the present invention is to provide a method of manufacturing an optical plate applied to the display device described above.

A display device according to an embodiment of the present invention for realizing the object of the present invention includes a display panel and a backlight assembly. The display panel displays an image using light. The backlight assembly may include a lamp disposed under the display panel to emit light, an optical plate interposed between the display panel and the lamp, and to improve brightness of the light provided from the lamp and to emit the light to the display panel, and the optical plate. And a diffusion sheet including a diffusion sheet for diffusing the light emitted from the diffusion sheet and a high brightness reinforcement film for improving the luminance of the light diffused in the diffusion sheet. The optical plate includes a light collecting part on which a prism pattern is formed, and a diffusion part on which a fisheye lens pattern is formed.

According to another aspect of the present invention, there is provided a method of manufacturing an optical plate, the method including: forming a prism pattern on an upper surface of a first flat plate base portion and a fisheye on an upper surface of a second flat plate base portion; Forming a lens pattern, and bonding the back surface of the prism pattern and the second flat plate base portion to form an air layer between the groove of the prism pattern and the back surface of the adhesive layer.

According to another aspect of the present invention, there is provided a method of manufacturing an optical plate, the method including: forming a prism pattern on an upper surface of a first flat plate base portion and a fisheye on an upper surface of a second flat plate base portion; Forming a lens pattern, and bonding the prism pattern and the fisheye lens pattern to form an air layer between the groove of the prism pattern and the fisheye lens pattern.

According to the display device and the manufacturing method of the optical plate applied thereto, the number of the optical sheets in the backlight assembly can be reduced by reducing the number of optical sheets in the backlight assembly by including the diffusion part and the light collecting part on the optical plate. can do.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention.

<Example-1 of the optical plate>

1 is a perspective view of an optical plate according to a first embodiment of the present invention.

Referring to FIG. 1, the optical plate 100 includes a condenser 110, a UV curable resin adhesive layer 120 adhered to the condenser 110, and a diffusion part adhered onto the UV curable resin adhesive layer 120. 130).

The light collecting part 110 may include a first flat plate base part 112 and a prism pattern 114 protruding from the first flat plate base part 112. The apex of the unit prism acid of the prism pattern 114 is a round shape having a radius of curvature within 5 μm to 10 μm, and has a peak angle of 40 degrees to 70 degrees.

The diffusion part 130 includes a second flat plate base part 132 and a fisheye lens pattern 134 formed to protrude convexly on the second flat plate base part 132. The unit fisheye lens of the fisheye lens pattern 134 has a curvature radius of 30 to 45 μm and a pitch of 100 to 200 μm.

The first and second flat plate bases 112 and 132 of the optical plate 100 have a transmittance of 85% or more and are made of a transparent plastic plate having a thickness of 0.5 mm to 2 mm. The plastic plate may be made of a transparent, high refractive index polycarbonate-series resin (PC), polymethylmethacrylate-serises resin (PMMA), methacrylate-styrene copolymer Use a material such as (methacrylate-styrene copolymer, MS).

The UV curable resin adhesive layer 120 adhering the light collecting part 110 and the diffusion part 130 has the same refractive index as that of the first and second flat plate base parts 112 and 132.

2A to 2C are manufacturing process diagrams of the optical plate shown in FIG. 1.

Referring to FIG. 2A, the light collecting part 110 having the first flat base portion 112 formed on the rear surface and the prism pattern 114 formed on the top surface is formed using the brightness enhancement film (BEF) as a master. Form.

Referring to FIG. 2B, the UV curable resin adhesive layer 120 is mounted on the prism pattern 114.

Referring to FIG. 2C, the diffusion part 130 having the fisheye lens part 134 formed on the second flat plate base part 132 is mounted on the UV curable resin adhesive layer 120. At this time, the second flat plate base part 132 of the diffusion part 130 is used as an adhesive surface. In this way, the light concentrator 110, the UV curable resin adhesive layer 120, and the diffusion part 130 are sequentially disposed, and then irradiated with UV light to bond the UV curable resin adhesive layer 120. Since the condenser 110 and the UV curable resin adhesive layer 120 are not strongly compressed, an air layer is formed between the V-shaped groove formed on the prism pattern of the condenser 110 and the UV curable resin adhesive layer 120. 140 is formed.

3 is a cross-sectional view schematically illustrating an optical path of the optical plate illustrated in FIG. 1.

 Referring to FIG. 3, the light emitted from the lamp 300 is refracted through the prism pattern 114 of the light condenser 110 and collected in the vertical direction. Light collected through the light collecting unit 110 is incident on the diffusion unit 130 disposed on the adhesive layer 120 via the adhesive layer 120. Light incident on the diffuser 130 is diffused and scattered while passing through the fisheye lens pattern 134 of the diffuser 130.

In addition, a portion of one surface of the adhesive layer 120 is adhered to the prism pattern 114 while the remaining portion of the one surface is unbonded to capture the first air layer 140, thereby further diffusing and scattering light.

As a result, the light provided from the lamp 300 is more evenly distributed on the display screen. In addition, since the optical plate according to the present invention can be replaced with a plurality of optical sheets, it is possible to expect a brightness improving effect by reducing the light lost by the optical sheets.

<Example-2 of the optical plate>

4 is a perspective view of an optical plate according to a second embodiment of the present invention.

Referring to FIG. 4, the optical plate 200 includes a diffuser 230, a UV curable resin adhesive layer 220 adhered on the diffuser 230, and a light condenser adhered on the UV curable resin adhesive layer 220. 210).

The diffusion part 230 includes a third flat plate base part 232 and a fisheye lens pattern 234 protrudingly convex on the first flat plate base part 232. The unit fisheye lens of the fisheye lens pattern 234 has a radius of curvature of 30 ~ 45㎛, and a pitch of 100 ~ 200㎛.

The condenser 130 includes a fourth flat plate base 212 and a prism pattern 214 protruding below the fourth flat plate base 212. The apex of the unit prism acid of the prism pattern 214 is a round shape having a radius of curvature within 5 μm to 10 μm, and has a peak angle of 40 degrees to 70 degrees.

The third and fourth flat base parts 232 and 212 of the optical plate 200 have a transmittance of 85% or more, and are made of a transparent plastic plate having a thickness of 0.5 mm to 2 mm. The plastic plate may be made of a transparent, high refractive index polycarbonate-series resin (PC), polymethylmethacrylate-serises resin (PMMA), methacrylate-styrene copolymer Use a material such as (methacrylate-styrene copolymer, MS).

The UV curable resin adhesive layer 220, which bonds the diffusion part 230 and the light collecting part 210, has the same refractive index as that of the third and fourth flat plate base parts 230 and 210.

5A to 5C are manufacturing process diagrams of the optical plate shown in FIG. 4.

Referring to FIG. 5A, a fisheye lens pattern 234 is formed on an upper surface of the third flat plate base portion 232 to define the diffuser 230.

5B and 5C, a UV curable resin adhesive layer 220 is coated on the fisheye lens pattern 234 of the diffusion part 230, and a light condenser is formed on the upper surface of the UV curable resin adhesive layer 220. 210). At this time, the prism pattern 214 of the light collecting part 210 and the upper surface of the adhesive layer 220 are placed facing each other. After the deposition in this order of the diffusion portion 230, the adhesive layer 220 and the light collecting portion 210, and irradiated with UV light to bond the UV curable resin adhesive layer 220. The diffusion part 230 and the adhesive layer 220, and the adhesive layer 220 and the light collecting part 210 are not strongly compressed. Therefore, a fine air layer 240a is formed between the groove of the fisheye lens pattern of the diffusion part 230 and the rear surface of the adhesive layer 220. In addition, a fine air layer 240b is formed between the upper surface of the adhesive layer 220 and the groove of the prism pattern of the light collecting part 210.

FIG. 6 is a cross-sectional view schematically illustrating an optical path of the optical plate illustrated in FIG. 4.

Referring to FIG. 6, the light emitted from the lamp 300 is diffused and scattered while passing through the fisheye lens pattern 234 of the diffuser 230. Light diffused and scattered through the diffusion part 230 is incident on the light collecting part 210 disposed on the adhesive layer 220 via the adhesive layer 220. Light incident on the light collecting part 210 is refracted while passing through the prism pattern 214 of the light collecting part 210 and is focused in the vertical direction.

In addition, a portion of one surface of the adhesive layer 220 is adhered to the fisheye lens pattern 234 while the remaining portion of the one surface is unbonded to capture the first air layer 240a, thereby further diffusing and scattering light. In addition, a portion of the other surface of the adhesive layer 220 is adhered to the prism pattern 214 and the other portion of the other surface is unbonded to capture the second air layer 240b, thereby diffusing and scattering light.

As a result, the light provided from the lamp 300 is more evenly distributed on the display screen. In addition, since the optical plate according to the present invention can be replaced with a plurality of optical sheets, it is possible to expect a brightness improving effect by reducing the light lost by the optical sheets.

<Method of manufacturing diffusion part of fisheye lens pattern>

7A to 7F are process diagrams illustrating a manufacturing method of a diffusion part of a fisheye lens pattern according to the present invention.

First, as shown in FIG. 7A, after preparing a base substrate SUB on which a metal such as pure copper, brass, aluminum or nickel is deposited on the stage STG, the surface is mirror-polished using a flat diamond tool. do.

Subsequently, as shown in FIG. 7B, a tool such as a diamond bite (DB) is used to form grooves of a certain depth on the surface of the resultant product of FIG. 7A. The grooves are intended to form a fisheye lens pattern in the diffusion part in the future.

Next, as shown in FIG. 7C, a father stamper (FS) is formed through a cast-iron product in which a molten metal is formed on the resultant of FIG. 7B and then solidified. Accordingly, the father stamper FS is manufactured to have a shape opposite to that of the base substrate SUB having grooves formed on a surface thereof.

Subsequently, as illustrated in FIG. 7D, a daughter stamper having a shape opposite to that of the father stamper FS is formed through a casting process of forming and solidifying a molten metal on the resultant product of FIG. 7C. stamper (DS). Here, in manufacturing a stamper for molding a fisheye lens pattern, when manufacturing a large amount of fisheye lens pattern using the stamper, it is necessary to prepare a plurality of fisheye lens patterns at a time by providing a plurality of stampers. There is.

In this case, if a plurality of stampers are manufactured from the base substrate SUB, a portion of the base substrate SUB coming into contact with the stamper may be worn, resulting in poor shape.

Therefore, in the embodiment of the present invention, a plurality of daughter stampers are manufactured using the father stamper. Then, the fisheye lens pattern is manufactured using the daughter stamper.

As described above, when the fisheye lens pattern is molded using two stampers, the father stamper FS and the fisheye lens pattern to be molded are the same, and the shape of the base substrate and the daughter stamper DS is the same. Should be. Therefore, the shape of the daughter stamper DS and the shape of the fisheye lens pattern to be molded are reversed.

Subsequently, as shown in FIG. 7E, the UV cured resin RSN is filled in the grooved surface of the daughter stamper DS formed by FIG. 7D, and the flat plastic base plate 112 is positioned. . The UV curable resin (RSN) is preferably a material having the same refractive index as the flat base portion 112.

Subsequently, the UV curing resin (RSN) is attached to one surface of the flat plate base 112 by irradiating UV light while pressing the edge region of the flat plate base 112 through the outer crimping pole POL. As the UV cured resin RSN is attached to the flat plate base 112, the diffuser 110 having the fisheye lens pattern 114 formed on one surface of the flat plate base 112 is completed as shown in FIG. 7F. do.

As another example, the transparent plastic flat plate base portion 112 is positioned on the surface of the groove stamper DS shown in FIG. 7D.

Subsequently, the daughter stamper and the flat plate base 112 are compressed by applying high temperature and high pressure on the flat plate base 112. Thus, as shown in FIG. 7F, the diffusion part 110 having the fisheye lens pattern 114 formed on one surface of the flat plate base part 112 is completed.

<Example of Display Device>

8 is an exploded perspective view of a liquid crystal display having a backlight assembly according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the liquid crystal display device includes a storage container 310, a flat panel fluorescent lamp 320, an inverter 330, and a display unit 400.

The storage container 310 has a storage space for accommodating the flat fluorescent lamp 320.

The planar fluorescent lamp 320 is divided into a plurality of discharge spaces to generate light, an external electrode formed to intersect discharge spaces at both ends of the lamp body, and the lamp body to be in contact with the external electrode. And a coupled auxiliary electrode.

Specifically, the lamp body is a rectangular plane when viewed from above, in order to emit light in the form of a plane. The lamp body generates a plasma discharge in the discharge spaces by the discharge voltage applied from the inverter 330 to the external electrode, and converts the ultraviolet rays generated by the plasma discharge into visible light and emits it to the outside. Since the lamp body has a large light emitting area, the internal space is divided into a plurality of discharge spaces to improve the light emitting efficiency and uniform light emission. The lamp body includes a first substrate and a second substrate coupled to each other to form a plurality of discharge spaces.

The inverter 330 generates a discharge voltage for emitting light of the plate fluorescent lamp 320.

The display unit 400 includes a liquid crystal panel 410 for displaying an image using light supplied from the flat fluorescent lamp 320 and a driving circuit unit 420 for driving the liquid crystal panel 410.

The liquid crystal panel 410 is interposed between a first substrate 412, a second substrate 414 coupled to the first substrate 412, and between the first substrate 412 and the second substrate 414. And a liquid crystal layer 416.

The first substrate 412 is a TFT substrate in which a thin film transistor (hereinafter, referred to as TFT) as a switching element is formed in a matrix form. For example, the first substrate 412 is made of glass. A data line and a gate line are respectively connected to the source terminal and the gate terminal of the TFTs, and a pixel electrode made of a transparent conductive material is connected to the drain terminal.

The second substrate 414 is a color filter substrate in which RGB pixels for implementing colors are formed in a thin film form. For example, the second substrate 414 is made of glass. A common electrode made of a transparent conductive material is formed on the second substrate 414.

In the liquid crystal panel 410 having such a configuration, when power is applied to the gate terminal of the TFT and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode. The arrangement of the liquid crystal molecules of the liquid crystal layer 416 interposed between the first substrate 412 and the second substrate 414 is changed by the electric field, and is supplied from the flat fluorescent lamp 320 according to the change of the arrangement of the liquid crystal molecules. The transmittance of light to be changed is displayed to display an image of a desired gray scale.

The driving circuit unit 420 may include a data printed circuit board 422 supplying a data driving signal to the liquid crystal panel 410, a gate printed circuit board 424 supplying a gate driving signal to the liquid crystal panel 410, and A data flexible printed circuit film 426 connecting the data printed circuit board 422 to the liquid crystal panel 410 and a gate flexible printed circuit film connecting the gate printed circuit board 424 to the liquid crystal panel 410. 428).

The data printed circuit board 422 is disposed on the side or the back of the storage container 310 by bending the data flexible printed circuit film 426, and the gate printed circuit board 424 is the gate flexible printed circuit film. The bending of 428 is disposed on the side or the back of the receiving container 310. The gate printed circuit board 424 may be removed by forming separate signal lines on the liquid crystal panel 410 and the gate flexible printed circuit film 428.

The liquid crystal display device includes a first mold 340 disposed between the planar fluorescent lamp 320 and the optical plate 100, and a second mold disposed between the optical plate 100 and the liquid crystal panel 410. 360).

The first mold 340 is coupled to the storage container 310 from the top of the flat fluorescent lamp 320 to fix the flat fluorescent lamp 320. The first mold 340 fixes the edge of the flat fluorescent lamp 320 while covering the external electrode region where light is not actually emitted, and supports the edge of the optical plate 100 having the fisheye lens pattern shape. The first mold 340 may be integrally formed in a frame shape, may be formed of two pieces having a c-shape or a-shape, or may be divided into four pieces corresponding to each side.

The optical plate 100 is disposed above the flat fluorescent lamp 320 and diffuses the light emitted from the flat fluorescent lamp 320 to improve the uniformity of the light. Since the optical plate 100 has been described above with reference to FIGS. 1 to 3, a detailed description thereof will be omitted. In FIG. 8, the lower plate having the prism pattern in the upward direction and the upper plate having the fisheye lens pattern in the upward direction employ an optical plate integrally formed by an adhesive layer. Those skilled in the art may employ an optical plate in which a lower plate in which the fisheye lens pattern shown in FIGS. 4 to 6 is formed in an upward direction and an upper plate in which a prism pattern is formed in a downward direction are integrally formed by an adhesive layer.

The second mold 360 fixes the edge of the optical plate 100 and supports the edge of the liquid crystal panel 410. Like the first mold 340, the second mold 360 may be integrally formed in a frame shape or may have a structure divided into two or four pieces.

The liquid crystal display may further include a diffusion sheet 150 and a dual brightness enhancement film (DBEF) 160 sequentially disposed on the optical plate 100. The luminance enhancing film 160 has a stacked sheet structure having different refractive indices.

The liquid crystal display may further include a buffer member 370 disposed between the storage container 310 and the flat plate fluorescent lamp 320 to support the flat plate fluorescent lamp 320. The buffer member 370 is disposed to correspond to an edge of the flat fluorescent lamp 320, and the flat fluorescent lamp 320 is spaced apart from the storage container 310 by a predetermined distance from the flat fluorescent lamp 320. Electrical contact between the metal storage container 310 is blocked. To this end, the buffer member 370 is made of an insulating material.

In addition, the buffer member 370 is preferably made of a material having a certain degree of elasticity in order to absorb the impact applied from the outside. For example, the shock absorbing member 370 is made of silicon. The buffer member 370 is composed of two pieces having a c-shape. In contrast, the buffer member 370 may be formed of four pieces corresponding to each side of the flat fluorescent lamp 320, or may be formed of four pieces corresponding to four corners of the flat fluorescent lamp 320. Or it may be formed integrally of the frame shape.

The liquid crystal display may further include a top chassis 380 for fixing the display unit 400. The top chassis 380 is coupled to the storage container 310 to fix the edge of the liquid crystal panel 410. In this case, the data printed circuit board 422 is bent by the data flexible printed circuit film 426 and fixed to the side or bottom of the storage container 310. The top chassis 380 is made of, for example, a metal having little deformation and excellent strength.

As described above, the light collecting part of the prism pattern and the diffusing part of the fisheye lens pattern are formed in the optical plate according to the present invention. Therefore, since the role played by the diffusion sheet, the prism sheet, the protective sheet, and the like can be performed by the single-layer optical plate, the reduction of the optical sheet is prevented while the luminance is reduced even though the number of the optical sheets is reduced. The manufacturing cost can be reduced.

In addition, the production line can reduce the difficulty of assembling a plurality of sheets in the device, there is an advantage that can flexibly respond to the thinning of the display device recently required.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (14)

A lamp for emitting light; It has a prism pattern having a peak angle of 40 to 70 degrees on the upper surface, and has a light converging portion for condensing and exiting the light emitted from the lamp, and a fisheye lens pattern formed on the upper surface, the back is adhered to the light converging portion by an adhesive layer An optical plate having a diffusion part that receives the light emitted from the light collecting part via the adhesive layer and diffuses the first light to emit the light; A diffusion sheet for diffusing the first diffused light from the optical plate to emit the second diffused light; A high brightness reinforcement film which emits light by improving brightness of second light diffused from the diffusion sheet; And And a display panel for displaying an image using the luminance-enhanced light. The display device of claim 1, wherein the light collecting part is partially adhered to the adhesive layer to capture an air layer. The display device of claim 1, wherein a vertex of the prism pattern of the prism pattern has a radius of curvature of about 5 μm to about 10 μm. The display device of claim 1, wherein the fisheye lens pattern has a radius of curvature of 30 to 45 μm and a pitch of 100 to 200 μm. The display device of claim 1, wherein each of the light collecting part and the diffusing part is formed of a plastic plate having a transmittance of 85% or more, a concentration of a diffusing agent of less than 1%, and a thickness of 0.5 mm to 2 mm. The display device of claim 1, wherein the adhesive layer has the same refractive index as that of the light converging part and the diffusing part. The display device of claim 1, wherein the adhesive layer is a UV curable resin. A lamp for emitting light; It has a fisheye lens pattern formed on the upper surface, and having a diffusion portion disposed on the lamp to emit the light emitted from the lamp by a first diffusion, and a prism pattern having a peak angle of 40 to 70 degrees on the back, by the adhesive layer An optical plate attached to a light collecting unit, the optical plate having a light collecting unit to collect and emit light diffused in the fisheye lens pattern; A diffusion sheet for diffusing the light collected by the optical plate to emit the light; A high brightness reinforcing film which emits light by improving the luminance of the second light diffused from the diffusion sheet; And And a display panel for displaying an image using the luminance-enhanced light. The display device of claim 8, wherein the light collecting part is partially adhered to the adhesive layer to capture an air layer. The display device of claim 8, wherein a vertex of the prism pattern of the prism pattern has a radius of curvature of about 5 μm to about 10 μm. The display device of claim 8, wherein the fisheye lens pattern has a radius of curvature of 30 to 45 μm and a pitch of 100 to 200 μm. The display device of claim 8, wherein each of the light collecting part and the diffusing part is formed of a plastic plate having a transmittance of 85% or more, a concentration of a diffusing agent of less than 1%, and a thickness of 0.5 mm to 2 mm. Forming a prism pattern on an upper surface of the first flat plate base portion; Forming a fisheye lens pattern on an upper surface of the second flat plate base portion; And Bonding the prism pattern and the back surface of the second flat plate base portion to form an air layer between the grooves of the prism pattern and the back surface of the adhesive layer. Forming a prism pattern on an upper surface of the first flat plate base portion; Forming a fisheye lens pattern on an upper surface of the second flat plate base portion; And Adhering the prism pattern and the fisheye lens pattern to form an air layer between the groove of the prism pattern and the fisheye lens pattern.

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