KR101025751B1 - High luminance multifunctional plate combined by diffusion plate, method of manufacturing thereof and liquid crystal display equipped with them - Google Patents

Abstract

The present invention relates to a diffuser plate integrated high brightness composite plate having a polarizing layer including birefringent microfibers integrated on a diffuser plate having a light diffusing agent dispersed on a transparent substrate, a manufacturing method thereof, and a liquid crystal display device having the same.

In the diffuser plate integrated high brightness composite plate of the present invention, a polarizing layer including birefringent microfiber is disposed on a diffuser plate in which a light diffusing agent is dispersed on a transparent substrate, so that the birefringent interface between the isotropic substrate constituting the polarizing layer and the birefringent microfiber is formed. By implementing the high brightness by improving the condensing efficiency of the incident light incident at the effective angle as well as the incident angle by the effective angle, it is possible to reduce the number of optical films mounted on the backlight unit, thereby making the liquid crystal display module slim and Through the simplification of the manufacturing process, the manufacturing cost can be lowered, and when the sheet assembly of the conventional multi-layer structure, the problem between the sheets can be fundamentally solved.

Microfiber, Diffusion Plate, All in One, Composite Plate, Slim, Reliability

Description

Diffusion plate integrated high brightness composite plate, manufacturing method thereof, and liquid crystal display device having the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffuser plate integrated high brightness composite plate, a manufacturing method thereof, and a liquid crystal display device having the same, wherein a polarizing layer including birefringent microfiber is disposed on a diffuser plate on which a light diffusing agent is dispersed on a transparent substrate. The birefringent interface between the isotropic substrate and the birefringent microfiber, which enhances the condensing efficiency of the incident light incident at an effective angle as well as the incident light incident at an invalid angle, thereby realizing high brightness, thereby providing optical films mounted on the backlight unit. DETAILED DESCRIPTION The present invention relates to a diffuser plate integrated high brightness composite plate capable of improving the high brightness, assemblability and reliability while reducing the number of, and a manufacturing method thereof and a liquid crystal display device having the same.

Liquid crystal display (hereinafter referred to as "LCD") is a low power consumption, low heat generation and high definition image output device that can be manufactured in an ultra-thin, and has recently been spotlighted as an image display device in various fields of the industry, especially the LCD-TV market The proportion has continued to grow from 7% in 2004 to 22% in 2007. Unlike other flat panel display systems, the liquid crystal itself is a non-luminescent material, and since polarized light is used, a light source is required and a device for enhancing the light efficiency is required, which is referred to as a backlight unit (hereinafter referred to as "BLU"). I am in charge.

Particularly, in the case of a TV requiring high luminance, a BLU of a back light type of a type in which a large number of lamps are stored on the back is used.

Looking at the internal structure of the BLU for LCD TV in general, the reflection sheet; lamp; Diffuser plate; Diffusion sheet; Prism sheet; Protective sheet; And a liquid crystal panel, wherein the reflective sheet reflects the light from the lamp upwards to reach as much light as possible to the diffuser plate, and the diffuser plate removes the lamp luminance by the diffusion effect of the internal diffuser and uniformity of luminance. Perform the castle function. In addition, the diffusion sheet located on the diffusion plate uniformly diffuses and primary condensing light, and then increases the secondary luminance by condensing the prism sheet stacked on the diffusion sheet. In the backlight method, the maximum image brightness is designed with the minimum power consumption.

Among the BLUs, the diffusion sheet used for the purpose of improving luminance usually serves to condense light by the lens shape caused by the projections of the organic particles.

On the other hand, the prism sheet is formed in a linear prism lens structure having a triangular cross section on the base sheet layer, so that the light incident at a specific range of effective angles is focused while some of the light is recycled by recursive reflection. The light is re-incident to the angle of the range and condensed again to increase the luminance.

As described above, a combination of optical components of a general BLU is composed of a diffusion sheet, a prism sheet, and a protective sheet on a diffusion plate, and two diffusion sheets are provided on the premise that a large amount of incident light must be provided to realize high brightness. The method of laminating, laminating the diffusion sheet and prism sheet, and then laminating the diffusion sheet and prism sheet and laminating the protective film or laminating the pattern extrusion sheet, prism sheet and protective sheet on the pattern diffusion plate It has been tried.

However, in such a case, the unit price of the BLU is increased by using the multilayer optical sheet, and the problems of assemblability and reliability are pointed out as well as the process cost increase due to the process of assembling the multiple sheets of the optical film.

In recent years, various composite sheets having integrated functions have emerged in accordance with market trends for lowering manufacturing costs as well as trends in LCD enlargement and thinning.

Accordingly, the present inventors have endeavored to obtain an integrated high-brightness optical component that meets the demands of conventional LCDs and thinner films. As a result, the inventors have provided a composite plate in which a polarizing layer including birefringent microfiber is integrated on a diffuser plate containing a light diffusing agent. In the conventional backlight unit, by replacing the optical component consisting of two to three optical sheets on the diffusion plate with one composite plate of the present invention, the number of optical sheets having a multi-layer structure is reduced, as well as brightness and assembly and reliability. By confirming that can be improved, the present invention was completed.

Disclosure of Invention An object of the present invention is to provide a diffuser plate-integrated high-brightness composite plate and a method of manufacturing the same, in which a polarizing layer including birefringent microfiber is integrated on a diffuser plate in which a light diffusing agent is dispersed in a transparent substrate.

Another object of the present invention is to provide a liquid crystal display device including the diffusion plate integrated high brightness composite plate in a backlight unit for an LCD TV.

In order to achieve the above object, the present invention provides a diffuser plate-integrated high brightness composite plate in which a polarizing layer including birefringent microfiber is integrated on a diffuser plate in which a light diffusing agent is dispersed in a transparent substrate.

The polarizing layer including the birefringent microfiber may have a thickness of 10 to 500 µm, a fiber composed of microfibers alone consisting of monofilaments having a diameter of 0.1 to 50 µm, or a fiber that is partially dispersed and woven.

In the diffusion plate-integrated high brightness composite plate of the present invention, the refractive index of the birefringent microfiber in the stretching direction (x-axis direction) is n'x, and the refractive indexes in the y-direction and z-direction in the direction perpendicular to the stretching direction are n ', respectively. When y and n'z and the refractive indices in the x-axis direction, y direction, and z direction of the transparent substrate in the polarizing layer are nx, ny, and nz, respectively, the larger the difference in refractive index between n'x and nx is, n'y, ny The smaller the difference between the refractive indices and the smaller the difference in the refractive indices of n'z and nz, the higher the luminance.

Preferably, the refractive index between the isotropic transparent substrate and the birefringent microfiber forming the polarizing layer satisfies the following equation.

┃n'x-nx┃> 0.1 (1)

┃n'y-ny┃ <0.05 (2)

┃n'z-nz┃ <0.05 (3)

(In the above, n'x is the refractive index in the micro-fine stretching direction (x-axis direction), n'y and n'z are the refractive indices in the y-direction and z-direction that are perpendicular to the stretching direction, and nx, ny and nz is the refractive index of the x-axis direction, the y direction, and the z direction of the transparent base material in a polarizing layer.)

Microfiber used in the present invention can be used optically anisotropic and excellent light transmittance material, polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC ), Polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), Acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA) , Polyacetal (POM), phenol, epoxy (EP), urea (UF), melamine (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer It is made of the above material.

The diffuser plate integrated high brightness composite plate of the present invention may further form any one lens pattern selected from lenticular, prism or pyramid on the upper surface of the diffuser plate integrated high brightness composite plate according to the purpose of increasing luminance.

The present invention is a first embodiment of the method for manufacturing the diffusion plate-integrated high brightness composite plate, the mixed resin mixed with a light diffusing agent in a transparent base resin, and when the molten mixed resin is extruded, the mixed resin After designing a polarizing layer including a birefringent microfiber on the upper portion, and then injecting the microfiber fibers through a roller to be laminated, there is provided a manufacturing method for cooling, sheet molding and stretching.

In addition, the present invention is a second embodiment of a method for manufacturing a diffuser plate integrated high brightness composite plate, to manufacture a diffuser plate in which a light diffusing agent is dispersed in a transparent substrate, and a polarizing layer comprising birefringent microfiber on the diffuser plate It provides a manufacturing method consisting of pressing the cover on both sides using a heating plate under the heating and pressurized conditions in which the oligomer and the base fabric is melted.

The thickness of the diffuser plate integrated high brightness composite plate manufactured from the manufacturing method of the first embodiment or the second embodiment of the present invention is 1 to 5 mm, and the thickness of the polarizing layer containing birefringent microfiber satisfies 10 to 500 μm. .

The polarizing layer including the birefringent microfiber of the present invention is a single microfiber made of monofilament having a diameter of 0.1 to 50 μm or a fiber in which the microfiber is partially dispersed and woven.

In the manufacturing method of the second embodiment of the present invention, the transparent base material and the base fabric used are the same material, and preferably have the same refractive index, and the refractive index is 1.4 to 2.0.

Furthermore, the present invention provides a backlight unit for an LCD TV, comprising: a lamp; A diffuser plate integrated high brightness composite plate having a polarizing layer including birefringent microfibers integrated into a diffuser plate having a light diffusing agent dispersed in a transparent substrate; And a liquid crystal panel; and a liquid crystal display device including a backlight unit for an LCD TV which is sequentially stacked.

According to the present invention, a multi-layered optical sheet formed on a conventional diffusion plate by providing a diffusion plate-integrated high-brightness composite plate in which a polarizing layer including birefringent microfiber is integrated on a diffusion plate having a light diffusing agent dispersed on a transparent substrate. High brightness while reducing the number.

In addition, the diffusion plate-integrated high brightness composite plate of the present invention integrates an optical component consisting of two to three sheets of optical sheets on a conventional diffusion plate into one composite plate of the present invention, thereby improving assemblability and assembling a sheet having a conventional multilayer structure. Reliability can be improved by fundamentally eliminating the problem of sheet gap between sheets.

In addition, the present invention can provide a liquid crystal display device having a high brightness composite plate integrated with a diffuser plate in the backlight unit for LCD TV, simplifying the assembly process of the optical component, reducing the process cost and slimming.

Hereinafter, the present invention will be described in detail.

The present invention provides a diffuser plate-integrated high brightness composite plate in which a polarizing layer including birefringent microfiber is integrated on a diffuser plate in which a light diffusing agent is dispersed in a transparent substrate.

As shown in FIG . 1 , the diffuser plate integrated high brightness composite plate 1 of the present invention includes a polarized light including a birefringent microfiber on the diffuser plate 40 in which the light diffusing agent 20 is dispersed in the transparent substrate 10. Layer 50 is an integrated structure.

That is, on the structure of the diffuser plate integrated high brightness composite plate 1 of the present invention, the diffuser plate 40 located at the lower part realizes the luminance uniformity by removing the diffuse effect by the internal diffuser 20 and the lamp bright line. The plate-integrated high brightness composite plate 1 performs a function of increasing the brightness by using the polarization effect of the microfiber birefringence located on the upper portion.

Hereinafter, the polarizing layer 50 including the birefringent microfiber 30 will be described on the structure of the diffuser plate integrated high brightness composite plate 1.

In the diffusion plate-integrated high brightness composite plate 1 of the present invention, an effective angle is obtained by disposing a polarizing layer containing birefringent microfiber on a diffuser plate by a birefringent interface between the isotropic substrate constituting the polarizing layer and the birefringent microfiber. In addition to the incident light incident at, the luminance can be dramatically improved by improving the light condensing efficiency of the incident light incident at an invalid angle.

Thus, the diffusion plate-integrated high brightness composite plate 1 of the present invention can realize high brightness equal to or higher than without stacking optical sheets in multiple layers in the conventional backlight unit [ Table 1 ].

FIG. 2 illustrates the principle of high brightness of the diffusion plate-integrated high brightness composite plate of the present invention, wherein the refractive index of the birefringent microfiber 30 in the polarizing layer 50 in the stretching direction (x-axis direction) is n'x. The refractive indexes in the y and z directions, which are perpendicular to the stretching direction, are n'y and n'z, respectively, and the refractive indices in the x-axis direction, y direction, and z direction of the transparent substrate in the polarizing layer 50 are respectively nx and ny. And nz, the difference between the x-axis refractive index of the birefringent microfiber 30 and the x-axis refractive index of the transparent base material is large, and the refractive indexes in the y-direction and z-direction of the birefringent microfiber 30 that is perpendicular to the stretching direction. If n'y and n'z are equal to the refractive indices in the y and z directions of the transparent substrate (n'y = ny and n'z = nz), the luminance increase is optimized.

That is, when the refractive index is satisfied, the unpolarized light emitted from the light source reaches only the polarization (P polarization) portion perpendicular to the stretching direction through the composite plate 1 to reach the panel, and the polarization of the remaining stretching direction ( S polarized light) is reflected downward, and in this process, the polarized light is changed upward while being reflected back from the diffuser plate 40 or the reflective sheet under the BLU. Therefore, the P-polarized part passes through the composite plate 1, and the remaining S-polarized light is recycled (Recycling) on the same principle, thereby increasing the luminance.

Accordingly, since the microfiber 30 of the present invention has optically birefringence, birefringence generated at a birefringent interface with an isotropic transparent substrate causes P-polarized light to pass through the composite plate and S-polarized light is recycled. While repeating the path of increasing the brightness continuously. Thus, the microfibers used in the present invention exclude the isotropic optical structure.

The present invention can be used to produce a microfiber by twisting dozens of microfiber, it may be a fiber of a part of the microfiber dispersed.

The microfiber used in the present invention is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), Heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), Polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea At least one selected from the group consisting of (UF), melamine (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer is used.

The cross-sectional shape of the microfiber of the present invention is not particularly limited to a circle, an ellipse, a polygon, and the like, and may have various cross-sectional shapes.

The polarizing layer of the present invention is a microfiber of monofilament having a diameter of 0.1 to 50㎛ alone or a fiber in which a part of the microfiber is dispersed and woven, and the thickness of the polarizing layer 50 made of the birefringent microfiber 30 is 10 to 500 micrometers is preferable. At this time, if the thickness of the polarizing layer is less than 10 μm, the brightness enhancement effect due to the microfiber is insufficient, and if the thickness of the polarization layer exceeds 500 μm, the brightness enhancement effect does not increase any more and is not only a saturation but also an increase in manufacturing cost. It is not preferable because it works.

Hereinafter, the diffusion plate 40 in which the light diffusing agent 20 is dispersed in the transparent substrate 10 on the structure of the diffusion plate integrated high brightness composite plate 1 will be particularly limited as long as it is a material used as a conventional BLU optical component. Can be used without.

More specifically, the transparent substrate used in the diffusion plate of the present invention may be used without particular limitation, so long as it is a transparent resin that can be used for optical, preferred examples are polymethyl methacrylate (PMMA), polystyrene (PS), It can be selected from polyethylene terephthalate (PET), random copolymer resin of styrene and methyl methacrylate (MS resin) or polycarbonate (PC).

The light diffusing agent 20 used in the diffusion plate 40 of the present invention can be used without particular limitation as long as it is a material commonly used in the art. Specifically, at least one member selected from the group consisting of silica, talc, calcium oxide, titanium dioxide, zinc oxide, barium sulfate, silicon dioxide, calcium carbonate, magnesium carbonate, aluminum hydroxide, clay, calcium phosphate, and glass beads Inorganic particles or at least one organic particle selected from the group consisting of acrylic resin, polystyrene, polyurethane, epoxy, polyvinyl chloride, polyacrylonitrile, polyamide and polymethyl methacrylate, and the inorganic particles and organic particles A mixed form of is also possible.

The size of the light diffusing agent 20 used in the present invention is not limited, but preferably an average particle diameter of 0.1 to 50 μm is used.

In addition, the content of the light diffusing agent 20 for increasing the light diffusing effect is preferably contained 0.01 to 10% by weight relative to the transparent base resin in order to conceal the lamp bright line and obtain a uniform brightness distribution. At this time, when the content of the light diffusing agent 20 exceeds 10% by weight, there is a problem that the light transmittance is lowered. In particular, the diffusion agent 20 of the present invention should be evenly dispersed in the entire area of the composite plate of the present invention except for the polarization layer 50.

Furthermore, the diffusion plate integrated high brightness composite plate 1 of the present invention includes a microfiber 30 made of an upper surface of the diffusion plate integrated high brightness composite plate, that is, a monofilament having a diameter of 0.1 to 50 μm, according to the purpose of brightness enhancement. The lens pattern selected from lenticular, prism or pyramid may be formed on the polarizing layer 50.

The present invention provides a method for producing a diffuser plate integrated high brightness composite plate.

A first preferred embodiment of the production method of the present invention is an extrusion process, wherein a mixed resin in which a light diffusing agent is mixed with a transparent base resin is melted, and the molten mixed resin 60 is die 61. When extruded through the), the birefringent microfiber fibers 62 are designed to be positioned on the upper portion of the mixed resin, and then the microfiber fibers are introduced and laminated through the rollers 63, 64, and 65, and then cooled, sheet-formed, and the like. Consisting of stretching [ FIG. 3 ].

In addition, the second embodiment of the present invention for the method for producing a diffuser plate integrated high brightness composite plate is carried out by a hot pressing method. Specifically, after manufacturing a diffusion plate 40 in which a light diffusing agent is dispersed in a transparent substrate, the microfiber fiber 50 is placed on the diffusion plate, the substrate fabric 51 is covered, and then the substrate fabric 51 is It consists of pressing on both sides using the heating plate 60 in the heating and pressing conditions to be melted [ FIG. 4 ].

In the method of manufacturing a composite plate according to the hot press method of the present invention, when heat and pressure are applied by a hot press, as the base material 51 is melted and impregnated in the fiber, the fiber and the diffusion plate are laminated. At this time, the base material 51 is made of the same material as the transparent base material, preferably having the same refractive index as the transparent base material, the refractive index is 1.4 to 2.0.

The thickness of the diffuser plate integrated high brightness composite plate manufactured from the manufacturing method of the first embodiment or the second embodiment of the present invention is 1 to 5 mm, and the thickness of the polarizing layer is prepared to satisfy 10 to 500 µm.

At this time, if the thickness of the diffuser plate integrated high brightness composite plate is less than 1mm, bending reliability problem occurs due to thinness, and if it exceeds 5mm, manufacturing cost of the composite plate rises and problems of slimming of the backlight unit are not preferable. .

In addition, if the thickness of the polarizing layer for implementing a high brightness in the diffuser plate integrated high brightness composite plate of the present invention is less than 10㎛, the polarization effect is lowered is not preferred, while if produced in a thickness exceeding 500㎛, the polarization effect is There is a problem that only the polarizer layer manufacturing cost rises no longer.

Furthermore, the present invention provides a backlight unit for an LCD TV, comprising: a lamp; A diffuser plate integrated high-brightness composite plate having a polarizing layer including a birefringent microfiber made of monofilament having a diameter of 0.1 to 50 μm in a diffuser plate in which a light diffusing agent is dispersed in a transparent substrate of the present invention; And a liquid crystal panel; and a liquid crystal display device including a backlight unit for an LCD TV which is sequentially stacked.

As shown in FIG. 5 , which shows a backlight unit having a diffuser plate integrated high brightness composite plate of the present invention as compared with a conventional backlight unit, the liquid crystal display of the present invention is equipped with a diffuser plate integrated high brightness composite plate, thereby providing a Since the optical component consisting of two or three optical sheets on the diffusion plate can be replaced, the manufacturing cost of the liquid crystal display device can be reduced.

In addition, since only one composite plate is assembled in the backlight unit when assembling two or three diffusion plates and sheets, the assembly time of sheets can be shortened three to four times, and a single plate of a composite plate integrated with a diffusion plate is also provided. By replacing with, it is possible to improve the assembly of the backlight unit. Furthermore, when the multilayer assembly of the conventional optical sheet, the problem between the sheets between the original problem can be solved at the source to improve the reliability.

Accordingly, the present invention provides a liquid crystal display device having a high brightness composite plate integrated with a diffuser plate in a backlight unit for an LCD TV to reduce the process cost by simplifying the assembly process of the optical component while implementing high brightness.

Hereinafter, the present invention will be described in detail by Examples and Experimental Examples. The following Examples and Experimental Examples are only illustrative of the present invention, and the scope of the present invention is not limited to the following Examples and Experimental Examples.

&Lt; Example 1 >

After spinning PEN under the condition of a spinning temperature of 305 ° C. and a spinning speed of 1500 M / min, a stretch microfiber having a diameter of 16 μm was obtained by three times stretching. The microfibers prepared above were used as warp yarns, and isotropic Co-PEN fibers were used as weft yarns to weave the fabrics. After dry mixing silica particles as a light diffusing agent to polycarbonate (PC) resin, the resultant is extruded by melt extrusion into a twin screw extruder, and the fabric made of the microfiber is laminated to the resin extruded through a T-die. After cooling, a composite plate having a thickness of 3 mm was prepared.

<Example 2>

Using a polycarbonate (PC) resin as a transparent substrate, a diffusion plate using silica as a light diffusing agent was prepared, and a 3-fold stretched PEN microfiber of 16 µm in diameter was arranged in a line in one longitudinal direction on the entire surface of the diffusion plate. . Subsequently, the base fabric of Co-PEN material was placed on the front surface of the microfiber to prepare an optical sheet sample. The sample was raised between heating plates maintained at 170 ° C., and then pressed for 3 minutes to prepare a composite plate having a thickness of 3 mm.

Experimental Example 1 Luminance Measurement

In order to measure the luminance of the composite plate 1 manufactured in Example 2, the luminance was measured using a 32 "direct type backlight unit, and the composite plate 1 was cut to use a BM-7 measuring instrument manufactured by Topcon. Thus, the measurement angle was 5 degrees, and the distance between the BM-7 and the backlight unit was 25 cm, and the horizontal and vertical equal intervals were divided into four, and the luminance of nine points, the intersections thereof, was measured nine times.

For comparison, the same diffuser plate, diffuser sheet, prism, and protective sheet were sequentially stacked in the standard configuration of the current optical sheet, and the luminance was measured by the same method. The results are shown in Table 1 below.

From the above results, the backlight unit employing the diffuser plate-integrated composite plate of the present invention replaced the optical component consisting of two or three optical sheets on the conventional diffuser plate, and confirmed the same or higher brightness while using one sheet. Thus, the diffuser plate integrated composite plate of the present invention may implement a high brightness while reducing the number of optical sheets having a multilayer structure formed on the diffuser plate in the conventional backlight unit, thereby reducing the manufacturing cost of the backlight unit.

As described above, the present invention

First, by integrating a polarizing layer including birefringent microfiber on the diffuser plate in which a light diffusing agent is dispersed in a transparent substrate, a diffuser plate-integrated high luminance which realizes high brightness while reducing the number of optical sheets having a multilayer structure formed on a conventional diffuser plate Composite plates were provided.

Secondly, by adopting the diffusion plate integrated high brightness composite plate of the present invention, since only one composite plate is assembled than when conventional diffusion plates and sheets 2-3 sheets are assembled, sheet assembly time can be shortened 3 to 4 times. In addition, by replacing the single diffusion plate integrated composite plate structure of the present invention, the assemblability and reliability of the backlight unit is improved, it is possible to fundamentally solve the problem of sheet-to-sheet in the conventional multi-layer assembly.

Third, the present invention is to provide a liquid crystal display device with a thin plate of a diffuser plate integrated high brightness composite plate in the backlight unit for LCD TV, simplifying the assembly process of the optical component, reducing the process cost.

While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

1 is a schematic diagram showing a cross-section of the diffusion plate integrated high brightness composite plate of the present invention,

Figure 2 illustrates the principle of the diffusion plate integrated high brightness composite plate of the present invention,

Figure 3 shows the manufacturing process of the diffusion plate integrated high brightness composite plate of the present invention by extrusion method,

Figure 4 shows the manufacturing process of the diffusion plate integrated high brightness composite plate of the present invention by the hot press method,

5 shows a comparison of a backlight unit having a diffuser plate integrated high brightness composite plate according to the present invention with a conventional backlight unit.

Claims (13)

On the diffuser plate where the light diffusing agent is dispersed in the transparent substrate, Polarizing layer containing birefringent microfiber is integrated, A diffuser plate-integrated high-brightness composite plate made of a microfiber sole made of monofilament having a birefringent microfiber of 0.1 to 50 μm in diameter, or a fiber in which the microfiber is partially dispersed and woven. delete The diffusion plate-integrated high brightness composite plate according to claim 1, wherein a thickness of the polarizing layer including the birefringent microfiber is 10 to 500 µm. The method of claim 1, wherein the microfiber is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS) ), Heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU) ), Polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP) The diffusion plate, characterized in that made of at least one material selected from the group consisting of urea (UF), melamine (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer. Integrated high brightness composite plate. The diffusion plate-integrated high brightness composite plate according to claim 1, wherein the refractive index between the isotropic transparent substrate and the birefringent microfiber yarn constituting the polarizing layer satisfies the following equation. ┃n'x-nx┃> 0.1 (1) ┃n'y-ny┃ <0.05 (2) ┃n'z-nz┃ <0.05 (3)  (In the above, n'x is the refractive index in the micro-fine stretching direction (x-axis direction), n'y and n'z are the refractive indices in the y-direction and z-direction that are perpendicular to the stretching direction, and nx, ny and nz is the refractive index of the x-axis direction, the y direction, and the z direction of the transparent base material in a polarizing layer.) The diffuser plate integrated high brightness composite plate according to claim 1, wherein the diffuser plate integrated high brightness composite plate further includes one lens pattern selected from lenticular, prism, or pyramid. Melting the mixed resin in which the light diffusing agent is mixed with the transparent base resin, When the molten mixed resin is extruded, the polarizing layer comprising a birefringent microfiber is placed on the mixed resin, and then cooled, sheet formed and stretched, The polarizing layer including the birefringent microfiber of the diffusion plate-integrated high brightness composite plate of claim 1, characterized in that the microfiber is made of a monofilament having a diameter of 0.1 to 50㎛ or the microfiber is partially dispersed and woven fiber. Manufacturing method. Manufacturing a diffusion plate in which a light diffusing agent is dispersed in a transparent substrate, Raising a polarizing layer comprising a birefringent microfiber on the front of the diffusion plate, After covering the base fabric, the base fabric is pressed on both sides using a heating plate under the heating and pressing conditions in which the base fabric is melted to integrate a polarizing layer including birefringent microfiber on the diffusion plate, The method of manufacturing a diffuser plate integrated high brightness composite plate according to claim 1, wherein the polarizing layer including the birefringent microfibers is in the form of a microfiber sole composed of monofilaments having a diameter of 0.1 to 50 µm or a fiber in which the microfibers are partially dispersed and woven. . The method of manufacturing a diffuser plate integrated high brightness composite plate according to claim 7 or 8, wherein the thickness of the diffuser plate integrated high brightness composite plate is in a range of 1 to 5 mm. The method of manufacturing a diffusion plate-integrated high brightness composite plate according to claim 7 or 8, wherein a thickness of the polarizing layer including the birefringent microfiber is 10 to 500 µm. delete The method of manufacturing a diffuser plate-integrated high brightness composite plate according to claim 7, wherein the transparent base material and the base fabric are the same material and have a refractive index of 1.4 to 2.0. lamp; Diffusion plate integrated high brightness composite plate of claim 1; And A liquid crystal display device comprising: a backlight unit for an LCD TV which is sequentially stacked.

Images