KR20110002676A - High luminance multifunctional polarizing sheet, rear polarizing film of liquid crystal display with them and liquid crystal display having the same - Google Patents

Abstract

PURPOSE: The polaroid film for the LCD panel back side applying the integrated high brightness polarization sheet, and that and liquid crystal display including the same makes maintain the high polarization efficiency by unitizing the fiber type reflective polarization layer in iodine-based or the dye system absorption type polarization layer. CONSTITUTION: The fiber type reflective polarization layer(10) is formed into the birefringence microfiber(12). The fiber type reflective polarization layer is unified with iodine-based or the dye system absorption type polarization layer(30). The absorption type polarization layer and fiber type reflective polarization layer can be unified with the bonding method.

Description

HIGH LUMINANCE MULTIFUNCTIONAL POLARIZING SHEET, REAR POLARIZING FILM OF LIQUID CRYSTAL DISPLAY WITH THEM AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

The present invention relates to an integrated high-brightness polarizing sheet, a polarizing film for LCD panel back applied thereto, and a liquid crystal display having the same, and more particularly, by integrating a fibrous reflective polarizing layer made of an absorption type polarizing layer and a birefringent microfiber, The present invention relates to a polarizing sheet in which high luminance is realized by a fibrous reflective polarizing layer while maintaining a high polarization efficiency by an absorption type polarizing layer, a polarizing film for LCD panel back applied thereto, and a liquid crystal display having the same.

As the modern industrial society develops into a high information age, the importance of the electronic display as a medium for transmitting various information is increasing day by day, and the liquid crystal display (LCD) is very important as a display device of information in place of the CRT. Occupies the position. In addition to mobile phones, car navigation systems are used for on-vehicle devices, especially monitors and large-screen TVs.

Liquid crystal display (LCD) is a display method that controls the light emitted from the backlight on-off by using the light switching function of liquid crystal molecules, but various kinds of optical films are used to realize high quality display. . As an optical film, a film group (diffusion film, prism sheet, brightness enhancement film, etc.) for effectively using a backlight, a film group (polarizing film, polarizer protective film) used for a polarizing plate, a phase difference between a liquid crystal cell and a polarizing plate is corrected. Retardation film).

According to a recent research report on display related fields, the market for optical films for backlights related to prism sheets, DBEF sheets, diffusers, and reflective films is growing day by day.

Commercially available polarizing films include absorption type or non-absorption type, and absorption type includes iodine-based polarizer or dye-based polarizer. Most of the polarizing plates currently used are PVA-iodine polarizing films having excellent optical characteristics.

PVA-iodine polarizing film is a polyvinyl alcohol (PVA) film is adsorbed iodine having a high dichroic to the PVA film in order to give the light absorbing ability of the visible light region, due to the structural characteristics of the iodine, Will have In this case, the polarizer property is to change the isotropic light into anisotropic polarization in the form of linear vibration or rotational vibration in one direction to enable selective polarization absorption.

However, PVA-iodine polarizing film has a birefringence, high light transmittance, no wavelength dependence, high heat resistance moisture resistance and high mechanical strength in order to prevent deformation of the film due to high sublimation and low durability of iodine. The film should be laminated with a protective film.

Accordingly, the PVA-dye polarizing film that appeared as an alternative to solve the durability problem due to the sublimation of iodine has polarizer properties due to the dichroism of the aligned dye itself during stretching, and even under high temperature and high humidity conditions. Since it has durability, there is little change in optical properties, and it is particularly suitable as a highly durable polarizing film for LCD which requires durability.

Another type of polarizing film is a reflective polarizing film that improves the polarization function and the brightness of the transmitted light through the rotation and secondary reflection of the reflected light after passing through the film. The reflective polarizing film is a film that uses specific polarization technology to emit specific light and continuously reflects specific light so that light can be used as much as possible without light loss.

Reflective polarizing films are manufactured by stacking layers having different refractive indices, etc., and are being used for improving luminance for maximizing light from light sources of LCDs and displays rather than polarizing films due to the lack of linearity of polarization. At this time, as a method of stacking multiple layers is applied, it is difficult to realize thinning of the film and causes a price increase.

As shown in FIG . 1 , the structure of a general liquid crystal display (LCD) is largely composed of a panel 100 and a backlight unit 200, and the polarizing film 400 located at the rear of the panel 100 will be described in more detail. 2 , the PVA protective films 420 and 430 are laminated on both sides of a polyvinyl alcohol (PVA) film 410 called a polarizer for implementing the most important polarization function in the polarizing film. In this case, a brightness enhancing film (3M DBEF sheet, 300) is inserted on the PVA protective film 420 located close to the LCD backlight 200 side, and a viewing angle compensating film on another PVA protective film 430. (Retardation plate 310) may be laminated.

Accordingly, the present inventors endeavored to develop a polarizing film that can reduce manufacturing costs while implementing polarization and luminance performance improvement of the conventional polarizing film, and thus, birefringent microfiber yarns in an absorption type polarizing film including a conventional iodine-based or dye-based film The present invention has been completed by integrating a fibrous reflective polarizing sheet comprising a high brightness polarizing sheet.

An object of the present invention is to provide a high brightness polarizing sheet in which a conventional iodine-based or dye-based absorbing polarizing layer and a fibrous reflective polarizing layer made of birefringent microfiber are integrated.

Another object of the present invention is to provide a liquid crystal display having a polarizing film for the rear panel to which the integrated high luminance polarizing sheet is applied, and further comprising the same.

The present invention provides a high-brightness polarizing sheet in which a fibrous reflective polarizing layer made of birefringent microfiber and an iodine-based or dye-based absorbing polarizing layer are integrated.

Polarizing sheet of the present invention can be integrated between the layers by an adhesive.

In the integrated high brightness polarizing sheet of the present invention, the diameter of the birefringent microfiber is monofilament having a diameter of 0.1 to 50 μm, and preferably, the fibrous reflective polarizing layer of the present invention is a microfiber made of monofilament having a diameter of 0.1 to 50 μm alone or The microfiber is partially dispersed and woven fiber, wherein the fibrous reflective polarizing layer has a thickness of 10 to 500 µm.

In the fibrous reflective polarizing layer made of the birefringent microfiber of the present invention, the refractive index between the birefringent microfiber in the fibrous reflective polarizing layer and the isotropic substrate 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 in the x-axis direction, y-direction, and z-direction of the transparent base material in the reflective polarizing layer.)

Microfiber used in the present invention can be used optically anisotropic and excellent light transmittance material, a preferred example, 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 At least one material selected from It is preferable that it consists of.

In the present integrated high-brightness polarizing sheet, the dye-based absorbing polarizing layer 30 is any one selected from dyes or pearl dyes selected from the group consisting of azo, anthraquinone, cyandigo, perylene and phthalone. It is preferable.

Accordingly, the present invention provides a polarizing film for a rear panel of a LCD panel combining a fibrous reflective polarizing layer made of birefringent microfiber and a high brightness polarizing sheet in which an iodine-based or dye-based absorbing polarizing layer is integrated.

More specifically, the PVA protective film is laminated on both sides of a polyvinyl alcohol (hereinafter referred to as 'PVA') film as a polarizer, and a fibrous reflective polarizing layer made of birefringent microfiber on one side of the lamination; A protective film is sequentially laminated, and on the laminated back side, an adhesive and a release paper are sequentially laminated to provide an LCD panel rear polarizing film.

In the polarizing film of the present invention, the PVA protective film is preferably a hydrophobic transparent resin film containing a triacetyl cellulose film or polyethylene terephthalate.

At this time, the diameter of the birefringent microfiber in the integrated high brightness polarizing sheet is a monofilament of 0.1 to 50㎛, more specifically, the fibrous reflective polarizing layer in the integrated polarizing sheet is a microfiber sole made of monofilament having a diameter of 0.1 to 50㎛ Or the microfiber is a fiber woven in part dispersed.

At this time, the thickness of the fibrous reflective polarizing layer in the integrated polarizing sheet is 10 to 500㎛. Since the integrated polarizing sheet of the present invention satisfies a specific refractive index between the birefringent microfiber and the isotropic substrate in the reflective polarization layer, high luminance is realized.

Furthermore, the present invention provides a liquid crystal display consisting of a panel and a backlight unit provided with the polarizing film for the LCD panel back.

The present invention provides a polarizing sheet in which a fibrous reflective polarizing layer made of birefringent microfiber is integrated into a conventional iodine-based or dye-based absorbing polarizing layer, thereby maintaining a high polarization efficiency by a conventional absorbing polarizing layer, By using the polarization effect of the birefringent interface between the microfiber and the isotropic substrate in the reflective polarization layer, the bright line concealment efficiency is increased, and not only incident light incident at an effective angle but also high light intensity of the incident light incident at an invalid angle Implement

Therefore, the integrated high brightness polarizing sheet of the present invention can replace the conventional brightness enhancement film (DBEF), it is possible to localize the material, it is possible to provide a polarizing film for LCD panel rear with a cost competitiveness.

Accordingly, the present invention can expect high polarization and high luminance efficiency of the liquid crystal display consisting of a panel and a backlight unit provided with a polarizing film for the LCD panel back.

Hereinafter, the present invention will be described in detail.

The present invention provides a high brightness polarizing sheet in which a fibrous reflective polarization layer 10 made of a birefringent microfiber 12 and an iodine-based or dye-based absorbing polarizing layer 30 are integrated.

In the polarizing sheet 1 of the present invention, the integration means the absorption type polarization layer 30 and the fibrous reflection polarization layer 10 may be integrated by adhesion means, and the adhesion means may be the absorption type polarization layer 30. ) And the fibrous reflective polarization layer 10 may be directly applied, or if a protective film or a release film is laminated between the layers as necessary, it may be applied for the purpose of adhesion between the multilayers.

3 is a schematic view of an integrated polarizing sheet which is a preferred embodiment of the present invention, on the fibrous reflective polarization layer 10 made of birefringent microfiber 12, the adhesive layer 20 and iodine-based or dye-based absorbing polarized light The layer 30 is sequentially laminated and integrated.

In the present invention, the fibrous reflective polarization layer 10 formed of the birefringent microfiber 12 is a fiber type in which the birefringent microfiber yarn alone or the birefringent microfiber yarn is partially dispersed and woven.

4 is The polarizing sheet of FIG. 3, which is a preferred embodiment of the present invention, illustrates the high luminance principle of the polarizing sheet 1 in which the absorbing polarizing layer 30 and the fibrous reflective polarizing layer 10 are integrated. The refractive index of the birefringent microfiber 12 in the polarizing layer 10 in the stretching direction (x-axis direction) is n'x, and the refractive indices in the y and z directions, which are perpendicular to the stretching direction, are n'y and x-axis of birefringent microfiber 12 when n'z and the refractive indices in the x-axis direction, y-direction, and z-direction of the transparent substrate 11 in the fibrous reflective polarization layer 10 are nx, ny, and nz, respectively. The refractive index of the birefringent microfiber 12 which is a direction perpendicular to the drawing direction is large, and the refractive indexes n'y and n'z of the birefringent microfibers 12 which are large in the direction perpendicular to the stretching direction are large. If the refractive indices in the y-direction and z-direction of (11) are the same (n'y = ny and n'z = nz), the luminance increase is optimized.

That is, the refractive index between the transparent base material 11 and the birefringent microfiber 12 in the fibrous reflective polarization layer 10 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 in the x-axis direction, y-direction, and z-direction of the transparent base material in the reflective polarizing layer.)

According to the above principle, the light transmitted to the panel reaches the fibrous reflective polarization layer 10 of the polarizing sheet 1 first, and passes only the polarization (P polarization) portion perpendicular to the stretching direction, Polarization (S polarization) is reflected down. In this process, the S-polarized light is re-reflected at the bottom, and the polarized light is changed and rises upward. Among the changed polarized light, P-polarized light passes and the remaining S-polarized light is recycled, thereby increasing luminance. At this time, the P-polarized light passes through the absorption type polarizing layer 30 to realize a polarization efficiency of 99.99% or more.

Accordingly, since the microfiber 12 of the present invention has optically birefringence, birefringence generated at the birefringent interface with the isotropic transparent substrate 11 causes P-polarized light to pass through the polarizing sheet, and S-polarized light is recycled ( Recycling) continuously repeats the path of increasing brightness. Thus, the microfiber 12 used in the present invention excludes the isotropic optical structure.

The polarizing sheet 1 of the present invention integrates the iodine-based or dye-based absorbing polarizing layer 30 and the fibrous reflective polarizing layer 10 made of birefringent microfiber, thereby increasing the While maintaining the polarization efficiency, the incident light incident at an effective angle as well as incident light incident at an invalid angle by the birefringent interface between the microfiber 12 and the isotropic substrate 11 in the fibrous reflective polarization layer 10 The light condensing efficiency can be improved to significantly improve the brightness. Thus, the integrated high-brightness polarizing sheet 1 of the present invention can realize a high brightness or higher even if not laminated in a multi-layer like the conventional reflective polarizing film.

The present invention can be used to produce a microfiber fibers by twisting dozens of microfibers 12, it may be a fiber of a part of the microfibers dispersed.

Preferred examples of the birefringent microfiber 12 of the present invention include polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) Roy, 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 And at least one selected from the group consisting of epoxy (EP), urea (UF), melamine (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer.

The shape of the cross section of the microfiber 12 of the present invention is not particularly limited to a circle, an ellipse, a polygon, or the like, and may have various cross-sectional shapes.

The fibrous reflective polarization layer 10 of the present invention is a fiber in which microfibers 12 made of monofilaments having a diameter of 0.1 to 50 μm or a part of the microfibers are dispersed and woven, and are made of the birefringent microfibers 12. As for the thickness of the polarizing layer 10, 10-500 micrometers is preferable. At this time, when the thickness of the polarizing layer is less than 10 μm, the brightness enhancement effect due to microfiber is insufficient, and when the thickness of the polarization layer exceeds 500 μm, the brightness enhancement effect does not increase any more and is not only saturated but also the manufacturing cost. It is not desirable because it acts as a synergist.

The transparent substrate 11 used in the polarizing sheet 1 of the present invention may be used without particular limitation as long as it is a transparent resin that can be used for optical purposes, and examples thereof include polymethyl methacrylate (PMMA) and polystyrene (PS). ), Polyethylene terephthalate (PET), random copolymer resin of styrene and methyl methacrylate (MS resin) or polycarbonate (PC) can be used.

The shape of the cross-section of the birefringent microfiber 12 of the present invention is not particularly limited to circular, elliptical, polygonal, and the like, and may have various cross-sectional shapes.

As described above, in the integrated high-brightness polarizing sheet 1 of the present invention, the reflective polarization layer 10 emits a specific light, while continuously reflecting the specific light so that the light can be used as much as possible without the loss of light. This achieves high brightness. In particular, since the reflective polarization layer 10 of the present invention is composed of a fibrous type of birefringent microfiber 12, the manufacturing cost is lower than that of the conventional multilayer thin film reflective polarization layer, and thus, price competitiveness can be achieved.

In the integrated high-brightness polarizing sheet 1 of the present invention, the absorption type polarizing layer 30 can be used without particular limitation as long as it is an absorption type polarizing layer conventionally used, and typically includes an iodine-based or dye-based absorption type polarizing layer. do. As the dye-based, any one selected from a dye selected from the group consisting of azo-based, anthraquinone-based, cyiodigo-based, perylene-based and phthalone-based or pearl dyes can be used.

In addition, the integration of the present invention refers to the integration by the adhesive means, preferably an integration method by the optical adhesive without optical damage, wherein the thickness of the adhesive layer 20 is not particularly limited, but 2 to 10㎛ is preferred. Do.

In the present invention, the PVA protective films 42 and 43 are respectively laminated on both sides of a polyvinyl alcohol (PVA) film 41 which is a polarizer, and the fibrous reflective piece light layer 10 of the present invention is disposed on either side of the lamination. Provided is a laminated polarizing film 40 for the LCD panel back.

More specifically, the PVA protective films 42 and 43 are respectively laminated on both sides of a polyvinyl alcohol (hereinafter referred to as 'PVA') film 41 which is a polarizer, and birefringent microfiber is formed on one surface of the lamination. The fibrous reflective polarization layer 10 and the protective film 44 made of a laminate are sequentially stacked, and on the back of the laminate, an adhesive 45 and a release paper 46 are sequentially stacked to provide a polarizing film for the back of the LCD panel . 5 ]. In FIG. 5, a phase difference or viewing angle compensation film may be stacked between the PVA protective film 43 and the pressure-sensitive adhesive 45, depending on whether the phase difference or viewing angle compensation is required.

In the LCD panel rear polarizing film 40 of the present invention, the PVA protective films 42 and 43 may be triacetyl cellulose (TAC) films or polyethylene terephthalate (PET). May be optionally used in the hydrophobic transparent resin film.

In the fibrous reflective polarization layer 10 of the LCD panel rear polarizing film 40 of the present invention, the birefringent microfiber 12 is made of monofilament having a diameter of 0.1 to 50 μm, and the microfiber fiber is twisted by several tens of strands. It may be used to manufacture, and may be a fiber in a form in which a microfiber part is dispersed. At this time, the thickness of the fibrous reflective polarization layer 10 made of the birefringent microfiber 12 is 10 to 500㎛.

In the LCD panel rear polarizing film 40 of the present invention, the refractive index between the birefringent microfiber 12 and the isotropic substrate 11 in the fibrous reflective polarization layer 10 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 base material in a reflection polarizing layer.

That is, when the refractive index is satisfied, not only incident light incident at an effective angle by the birefringent interface between the microfiber 12 and the isotropic substrate 11 in the fibrous reflective polarization layer 10 is incident at an invalid angle. The luminance can be dramatically improved by increasing the light condensing efficiency of the incident light.

Accordingly, the LCD panel rear polarizing film 40 of the present invention is a combination of the absorption type polarizing layer consisting of the PVA film 41 and PVA protective films 42, 43 and the fibrous reflective polarization layer 10, Since high luminance can be realized while maintaining high polarization efficiency from the absorption type polarizing film layer, a combination of a conventional absorption type polarizing film and an expensive luminance enhancement film (3M DBEF film) used for the purpose of luminance improvement can be used. In terms of manufacturing cost, the fibrous reflective polarizing layer is cheaper than the conventional multilayer thin film reflective polarizing layer, and the manufacturing cost can be reduced by simplifying the assembly process of the optical component through the integration of the existing polarizing film and the luminance enhancing film.

Therefore, the LCD panel rear polarizing film 40 to which the integrated high-brightness polarizing sheet 1 is applied may provide a final product having a price competitiveness as well as localizing materials.

Furthermore, the present invention can be expected to improve the performance of the liquid crystal display consisting of the panel 100 and the backlight unit 200 provided with the polarizing film 40 for the rear LCD panel. It demonstrates in detail.

The following examples are merely illustrative of the present invention, but the scope of the present invention is not limited to the following examples.

&Lt; Example 1 >

Step 1: preparing absorbing polarizing layer

0.2 parts by weight of anthraquinone dichroic dye (Disperse red 60) was mixed with respect to 100 parts by weight of polyethylene terephthalate, followed by extrusion at 270 ° C. to prepare a 200 μm thick film, which was stretched 5 times at 100 ° C. A polarizing film was prepared.

Step 2: preparing a fibrous reflective polarizer layer

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. Co-PEN resin was added to a twin-screw extruder to melt extrusion, and a fibrous reflective polarizing film having a thickness of 250 μm was prepared by cooling the fabric made of the microfiber to the resin extruded through a T-die. .

Step 3: manufacture the integrated polarizing sheet

After applying the UV curable adhesive on one surface of the fibrous reflective polarizing film prepared in Step 2, the absorbing polarizing film prepared in Step 1 was placed thereon to bond the interlayers to form the integrated polarizing film 40 for the back of the LCD panel. Prepared.

After assembling the panel on the 32 "direct backlight unit, the brightness was measured using Topcon's BM-7 measuring device. When the conventional brightness enhancing film (3M DBEF film) was inserted into the LCD panel back, While showing a 40% improvement, the result of attaching a polarizing film in which the absorbing polarizing layer of the present invention and the fibrous reflective polarizing layer made of birefringent microfibers was attached, and the result of improving the luminance of 45 to 50% was confirmed.

As described above, the present invention

First, by providing a polarizing sheet incorporating a fibrous reflective polarizing layer made of birefringent microfiber into a conventional iodine-based or dye-based absorbing polarizing layer, while maintaining a high polarization efficiency by the conventional absorbing polarizing layer, fibrous reflection The birefringent interface between the microfiber in the polarizing layer and the isotropic substrate may improve the light condensing efficiency of incident light, thereby realizing high brightness. Thus, an integrated high brightness polarizing sheet that satisfies high polarization and high brightness was provided.

Second, by applying the integrated high-brightness polarizing sheet to the polarizing film for LCD panel back, while maintaining the high polarization from the conventional absorption type polarizing layer, the brightness (45-50%) than the conventional brightness enhancement film (40% brightness) equipped with Is improved, and can be replaced with expensive commercial film products, it is possible to provide a product with a competitive price.

Third, a liquid crystal display device including a panel and a backlight unit having a polarizing film for LCD panel rear surface of the present invention can be expected to improve the performance of high polarization and high brightness.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. .

1 is a schematic diagram of the structure of a general liquid crystal display (LCD),

2 is a cross-sectional view of a conventional polarizing sheet,

3 is a schematic diagram of an integrated polarizing sheet which is a preferred embodiment of the present invention;

4 is It illustrates the high brightness principle of the integrated polarizing sheet of the present invention,

Figure 5 shows an example of a preferred structure of the polarizing film for the back panel of the LCD panel to which the integrated polarizing sheet of the present invention is applied.

<Brief Description of Drawings>

1: Integrated Polarizing Sheet 10: Fibrous Reflective Polarizing Layer

11: Base sheet 12: Birefringent microfiber

20: adhesive layer 30: absorbing polarizing layer

41: PVA film 42, 43: PVA protective film

44: protective film 45: adhesive

46: release paper 100: panel

40: polarizing film 50, 51 for the back panel

60: panel polarizing film 70: pattern material

71: alignment layer 72: ITO

73: liquid crystal 74: color PR

75: overcoat 200: backlight unit

210: reflective sheet 220: light source

230: diffusion plate 240: diffusion sheet

250: prism sheet 300: brightness enhancement film (DBEF film)

310: viewing angle compensation film 400: conventional polarizing film

410: PVA film 420: first PVA protective film

430: second PVA protective film

Claims (14)

A fibrous reflective polarizing layer made of birefringent microfiber A high brightness polarizing sheet in which an iodine-based or dye-based absorbing polarizing layer is integrated. The high brightness polarizing sheet according to claim 1, wherein the high brightness polarizing sheet is integrated with an adhesive. The high brightness polarizing sheet of claim 1, wherein the birefringent microfiber is a monofilament having a diameter of 0.1 to 50 μm. The high brightness polarizing sheet of claim 1, wherein the fibrous reflective polarizing layer is a microfiber yarn made of monofilament having a diameter of 0.1 to 50 μm or a fiber in which the microfiber yarn is partially dispersed and woven. The high brightness polarizing sheet according to claim 1, wherein the fibrous reflective polarizing layer has a thickness of 10 to 500 µm. The high brightness polarizing sheet of claim 1, wherein a refractive index between the birefringent microfiber and the isotropic substrate in the fibrous reflective polarization 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 base material in a reflection polarizing layer. 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) And urea (UF), melamine (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymers, characterized in that the high brightness polarizing sheet is made of one or more materials selected from the group consisting of. The method of claim 1, wherein the dye-based absorption type polarizing layer is any one selected from a dye or a pearl dye selected from the group consisting of azo, anthraquinone, cyandidigo, perylene and phthalone. The high brightness polarizing sheet. On both sides of the polyvinyl alcohol (PVA) film which is a polarizer, The PVA protective film is laminated, respectively The fibrous reflective polarization layer and the protective film of claim 1 are sequentially stacked on one surface of the lamination, Polarizing film for the back of the LCD panel, the pressure-sensitive adhesive and release paper is sequentially laminated on the laminated back. The polarizing film of claim 9, wherein the PVA protective film is a hydrophobic transparent resin film containing a triacetyl cellulose film or polyethylene terephthalate. The polarizing film of claim 9, wherein the birefringent microfibers in the fibrous reflective polarizing layer have a diameter of 0.1 to 50 µm. The polarizing film of claim 9, wherein the fibrous reflective polarizing layer made of birefringent microfiber in the fibrous reflective polarizing layer has a thickness of 10 to 500 µm. The polarizing film of claim 9, wherein the refractive index between the birefringent microfiber and the isotropic substrate in the fibrous reflective polarization 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 base material in a reflection polarizing layer. A liquid crystal display comprising a panel including a polarizing film for LCD rear panel of claim 9 and a backlight unit.

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