KR20160105667A - Polarizing plate and liquid crystal display apparatus comprising the same - Google Patents

Abstract

Provided are a polarizing plate and a liquid crystal display device comprising the same. The polarizing plate includes a polarizer, a first adhesive layer formed on one surface of the polarizer, a high refraction layer which is formed on the first adhesive layer and has at least one intaglio pattern, and a low refraction layer which includes a filling pattern which is filled in at least part of the intaglio pattern, and a first protection layer formed on the pattern layer. The first protection layer includes a base film made of at least one of triacetyl cellulose, polyethylene terephthalate, cyclic olefin polymer, and acrylic resin. The refractive index of the high refraction layer is larger than that of the low refraction layer. So, a lateral contrast ratio can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate and a liquid crystal display including the polarizing plate.

The present invention relates to a polarizing plate and a liquid crystal display including the same.

A liquid crystal display device is operated by emitting light from a backlight unit through a liquid crystal panel. Therefore, the front of the screen of the liquid crystal display device has good color and the like. However, the color contrast, the contrast ratio, and / or the viewing angle of the front side of the screen of the liquid crystal display device may be lowered.

The liquid crystal display device includes a polarizing plate, a liquid crystal panel, and a backlight unit. In order to increase the color, contrast, and viewing angle on the side, deformation of the liquid crystal panel or the liquid crystal structure is attempted. However, the deformation of the liquid crystal panel has limitations in terms of improvement in color and contrast ratio on the side, and the process is complicated. Further, as the screen of the liquid crystal display device becomes larger, the luminance uniformity becomes lower. Therefore, as the screen of the liquid crystal display device becomes larger, the module for the liquid crystal display device must be separately manufactured, so that the processability and economy may be lowered.

The background art of the present invention is disclosed in Japanese Laid-Open Patent Publication No. 2006-251659.

A problem to be solved by the present invention is to provide a polarizing plate capable of improving a side contrast ratio.

Another problem to be solved by the present invention is to provide a polarizing plate capable of improving a side view angle.

Another problem to be solved by the present invention is to provide a polarizing plate capable of increasing luminance uniformity.

Another object of the present invention is to provide a polarizing plate capable of lowering the rate of change of luminance uniformity.

Another object of the present invention is to provide a liquid crystal display device including the polarizer.

The polarizer of the present invention comprises a polarizer; A first adhesive layer formed on one surface of the polarizer; A pattern layer formed on the first adhesive layer, the pattern layer including a high refractive index layer having at least one indentation pattern and a low refractive index layer including a filling pattern filling at least a part of the depressed pattern; And a first protective layer formed on the pattern layer, wherein the first protective layer comprises a base film formed of at least one of triacetyl cellulose, polyethylene terephthalate, cyclic olefin polymer, and acrylic resin, The refractive index of the low refractive index layer may be larger than that of the low refractive index layer.

The liquid crystal display device of the present invention may include the polarizing plate.

The present invention provides a polarizing plate capable of improving lateral contrast ratio and side viewing angle.

The present invention provides a polarizing plate capable of enhancing luminance uniformity.

The present invention provides a polarizing plate capable of lowering the rate of change of luminance uniformity.

1 is a cross-sectional view of a polarizer according to an embodiment of the present invention.
2 is an exploded perspective view of the pattern layer of FIG.
3 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.
4 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
5 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
6 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
7 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
8 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
9 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
10 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
11 is a cross-sectional view of a polarizer according to another embodiment of the present invention.
12 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.
13 is a schematic diagram of a display device screen when measuring luminance uniformity.

The present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

The terms "upper" and "lower" in this specification are defined with reference to the drawings, wherein "upper" may be changed to "lower", "lower" What is referred to as "on" may include not only superposition, but also intervening other structures in the middle. On the other hand, what is referred to as "directly on" or "directly above"

In this specification, "horizontal direction" and "vertical direction" mean the long axis direction and the short axis direction of the rectangular liquid crystal display screen.

In the present specification, the term "side" refers to a plane (0 DEG, 0 DEG), a left end point (180 DEG, 90 DEG) And the right end point is defined as (0 deg., 90 deg.).

As used herein, the term " aspect ratio "means the ratio of the maximum height to the maximum width of the optical structure (maximum height / maximum width).

In the present specification, the term "period" means the sum of the width of the engraved pattern of one of the high refractive index layers of the pattern layer and the width of one adjacent flat portion.

In the present specification, "retardation in the retardation direction (Re)" is represented by the following formula A, "retardation in the thickness direction (Rth)" is represented by the following formula B, and "biaxiality degree (NZ) :

<Formula A>

Re = (nx - ny) xd

<Formula B>

Rth = ((nx + ny) / 2 - nz) xd

<Formula C>

NZ = (nx - nz) / (nx - ny)

(Nx, ny and nz are the refractive indexes in the slow axis direction, the fast axis direction and the thickness direction of the optical element at a wavelength of 550 nm, d is the thickness (unit: nm) of the optical element, to be).

In the present specification, "nx", "ny", and "nz" are the refractive indexes in the slow axis direction, the fast axis direction, and the thickness direction of the optical element at a wavelength of 550 nm, respectively.

13, in the liquid crystal display device in which the light source, the light guide plate, and the module for the liquid crystal display device are assembled, the center point of the screen 1 of the liquid crystal display device is designated as B, the left end point A, (Luminance max) and the minimum luminance value (luminance min), respectively, of the luminance at the points A, B, and C, respectively. The luminance uniformity is a value calculated as {(luminance min) / (luminance max)} x 100. The luminance was a value obtained by fixing the measuring device EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM Co.) to the point B and changing the direction of the measuring device to the points A, B and C, respectively. 13, A, B, and C are on the same line.

As used herein, "(meth) acrylic" means acrylic and / or methacrylic.

As used herein, the term "top part " refers to the uppermost part of the structure when the lowest part of the structure is assumed to be the basis.

In the present specification, the "refractive index" is a value measured with an Abbe refractometer at a wavelength of 550 nm.

Hereinafter, a polarizing plate according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of a polarizer according to an embodiment of the present invention. 2 is an exploded perspective view of the pattern layer of FIG.

Referring to FIG. 1, a polarizer 100 according to an embodiment of the present invention may include a polarizer 10, a pattern layer 20, a first protective layer 30, and an adhesive layer 40.

The polarizer 10 is formed on the pattern layer 20 and can polarize the incident light. Polarizer 10 may comprise conventional polarizers known to those skilled in the art. Specifically, the polarizer 10 may include a polyvinyl alcohol polarizer produced by uniaxially stretching a polyvinyl alcohol film in a machine direction (MD), or a polyene polarizer produced by dehydrating a polyvinyl alcohol film.

The thickness of the polarizer 10 may be 1 占 퐉 to 60 占 퐉, specifically, 2 占 퐉 to 50 占 퐉, more specifically, 2 占 퐉 to 30 占 퐉. Within the above range, it can be used in a liquid crystal display device, and is advantageous for thinning.

Although not shown in FIG. 1, an adhesive layer is further formed on the lower surface of the polarizer 10, so that the polarizer 100 can be easily adhered onto the liquid crystal panel. Specifically, the adhesive layer may be formed from a pressure-sensitive adhesive composition comprising a pressure-sensitive adhesive resin such as a (meth) acrylic resin, an epoxy resin, or a silicone resin, a curing agent, and a silane coupling agent.

Hereinafter, the pattern layer 20 will be described.

The pattern layer 20 is formed on the polarizer 10 and can diffuse the polarized light incident from the polarizer 10. As a result, the liquid crystal display device including the polarizing plate 100 according to the present embodiment can have a high contrast ratio at the side, improve the viewing angle and visibility at the side, and improve the luminance uniformity.

The thickness of the pattern layer 20 may be 40 占 퐉 or less, specifically 3 占 퐉 to 40 占 퐉, more specifically, 5 占 퐉 to 30 占 퐉. Within this range, it can be used in a liquid crystal display, and it is advantageous to thin film, and viewing angle, visibility and luminance uniformity can be improved without affecting other optical characteristics.

1 and 2, the pattern layer 20 includes a high refractive index layer 202 on which at least one engraved pattern 207 is formed, and a low refractive index layer 202 including a fill pattern 205 filling at least a portion of the engraved pattern 207. [ A refraction layer 201 may be included.

The high refractive index layer 202 is formed on the low refractive layer 201 and diffuses the light that is not reflected by the filling pattern 205 by the flat portion 206 among the light reaching the low refractive layer 201, The effect can be increased.

The refractive index of the high refractive index layer 202 is higher than that of the low refractive index layer 201. Specifically, the high refractive index layer 202 may have a refractive index of 1.50 or more, specifically 1.50 to 1.65, more specifically 1.50 to 1.60. Within this range, the light diffusion effect can be excellent. The high refractive index layer 202 may be formed of a composition for a high refractive index layer including an ultraviolet curable transparent resin having a refractive index of 1.50 or more, specifically 1.50 to 1.65, more specifically 1.50 to 1.60. Specifically, the transparent resin may include at least one of (meth) acrylic, polycarbonate, silicone, and epoxy resin, but is not limited thereto. The composition for a high refractive index layer may further comprise a conventional photoinitiator for forming a high refractive index layer.

The refractive index difference between the high refractive index layer 202 and the low refractive index layer 201 (the refractive index of the high refractive index layer-the refractive index of the low refractive index layer) may be 0.30 or less, specifically 0.10 to 0.15. In this range, the diffusion effect of condensed light can be large.

The high refractive index layer 202 may further include a light diffusing agent, thereby increasing the light diffusing effect. The light diffusing agent may include an organic light-diffusing agent, an inorganic light-diffusing agent, or a mixture thereof. A mixture of the organic light-diffusing agent and the inorganic light-diffusing agent can improve the diffusibility and transparency of the high-refractive-index layer. The light diffusing agent may be contained in the high refractive index layer 202 alone or in a mixture of two or more. The organic light-diffusing agent may include at least one of (meth) acrylic-based particles, siloxane-based particles, and styrene-based particles. The inorganic light-diffusing agent may include at least one of calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide and zinc oxide. In particular, when the inorganic light diffusing agent contains only the organic light diffusing agent, the decrease in contrast whiteness can be prevented and the light diffusing property can be increased. The light diffusing agent is not limited in shape and particle size. Specifically, the light-diffusing agent may include spherical cross-linked particles. The light diffusing agent may have an average particle diameter of 0.1 탆 to 30 탆, specifically 0.5 탆 to 10 탆. In the above range, the light diffusion effect can be realized, the surface roughness of the pattern layer increases, and the adhesion with the first protective layer is not a problem, and the degree of dispersion can be good. The light diffusing agent may be contained in the high refractive index layer in an amount of 0.1 to 20% by weight, specifically 1 to 15% by weight. Within this range, there may be a light diffusion effect.

Referring to FIG. 2, a first surface 204 is formed on the high refractive index layer 202, and one or more engraved patterns 207 and one or more flat portions 206 may be formed on the first surface 204 have. FIG. 2 shows a pattern layer in which one engraved pattern 207 and one flat portion 206 are alternately formed. However, the formation order of each of the engraved pattern 207 and the flat portion 206 is not particularly limited. The engraved pattern 207 may be a lenticular lens pattern including a curved surface. The curved surface serves as a lens, and the light incident from the polarizer 10 can be diffused by refracting in various directions depending on the arrival position. Fig. 2 shows a pattern layer 20 whose curved surface is aspherical. However, the curved surface may be a spherical surface, a parabolic surface, an elliptical surface, a hyperbolic surface, or an amorphous surface, or may include both a curved surface and a flat surface. 2 shows a pattern layer in which the engraved pattern 207 is a lenticular lens pattern, but the engraved pattern 207 may be a prism pattern having a curved surface at the top and a triangular or a rectangular cross section. Fig. 2 shows a pattern layer having a smooth curved surface, but the curved surface may be further provided with irregularities to further increase the light diffusion effect.

The engraved pattern 207 is not subject to the aspect ratio, but may be, for example, 1.0 or less, specifically 0.4 to 1.0, more specifically 0.7 to 1.0. In the above range, it is possible to increase the contrast ratio at the side, improve the viewing angle at the side, increase the luminance uniformity, and minimize the variation of the luminance uniformity as the screen size of the liquid crystal display device increases.

The sum of the entire widths of the engraved pattern 207 may be 40% to 60%, specifically 45% to 55% of the entire width of the high refractive index layer 202. In the above range, it is possible to increase the contrast ratio and luminance uniformity at the side, to improve the viewing angle at the side, and to minimize the variation of the luminance uniformity as the screen size of the liquid crystal display increases.

Referring again to FIG. 1, the maximum width Pl of the engraved pattern 207 may be 20 占 퐉 or less, specifically 10 占 퐉 or less, more specifically, 5 占 퐉 to 10 占 퐉. The maximum height H1 of the engraved pattern 207 may be 16 占 퐉 or less, specifically 10 占 퐉 or less, more specifically 3.0 占 퐉 to 10 占 퐉. In the range of width and height, there is a diffusion effect and an effect of improving moiré, and the processing can be made easy.

Since the engraved pattern 207 is arranged at a predetermined period, the effect of diffusing condensed light can be large. Specifically, the period C of the engraved pattern 207 may be 20 占 퐉 or less, specifically 10 占 퐉 to 20 占 퐉. In the above range, the light converging and diffusing effect may be large.

The flat portion 206 is formed between the engraved pattern 207 and the engraved pattern 207 so that the light reaching the flat portion 206 is totally reflected and emitted by the engraved pattern 207 to diffuse the light.

The ratio P1 / P2 of the maximum width P1 of the engraved pattern 207 to the width P2 of the flat portion 206 can be 1 or less, specifically 0.5 to 1.0. In the above range, the effect of condensing and diffusing is large, and the effect of improving moiré may be obtained.

The width P2 of the flat portion 426 may be 10 占 퐉 or less, specifically 5 占 퐉 to 10 占 퐉. Within this range, there can be an effect of improving the contrast ratio and moiré.

The low refractive layer 201 is formed on the polarizer 10 and can diffuse light by refracting polarized light incident in one direction from the polarizer 10 in various directions depending on the incident position and emitting the polarized light.

The refractive index of the low refractive layer 201 may be less than 1.50, specifically 1.35 or more and less than 1.50, more specifically 1.35 to 1.49. Within this range, the light diffusion effect is large, and the pattern layer can be easily produced.

The low refraction layer 201 may be formed of a composition for a low refractive layer including a transparent resin having a refractive index of less than 1.50, specifically 1.35 or more and less than 1.50, more specifically 1.35 to 1.49. Specifically, the transparent resin may include at least one of (meth) acrylic, polycarbonate, silicone, and epoxy resin, but is not limited thereto. The composition for a low refractive layer may further include a usual photoinitiator for forming a low refractive layer.

Referring again to FIG. 2, the low refractive layer 201 includes a second side 203 facing the first side 204 of the high refractive index layer 202, (205) may be formed. The fill pattern 205 may fill at least a portion of the engraved pattern 207 of the high refractive index layer 202. The "filling at least a part" includes both the case where the engraved pattern 207 is completely filled and the case where the engraved pattern 207 is partially filled. When the filling pattern partially fills the engraved pattern, the remaining portion of the unfilled engraved pattern may be filled with air or a resin having a predetermined refractive index. Specifically, the resin may have a refractive index equal to or larger than that of the low refractive index layer and equal to or smaller than that of the high refractive index layer.

2 shows a pattern layer in which a fill pattern 205 and a relief pattern 207 are formed in an elongated form of a stripe type, but the fill pattern 205 and the engraved pattern 207 are formed in a dot form As shown in FIG. The "dot" means that the combination of the filling pattern and the engraved pattern is dispersed.

The low refractive layer 201 may further include the above-described light diffusing agent. The light diffusing agent may be contained in the low refractive layer in an amount of 0.1 wt% to 20 wt%, specifically 1 wt% to 15 wt%. Within this range, there may be a light diffusion effect.

Figures 1 and 2 show a patterned layer 20 comprising a high refractive index layer 202 having at least one engraved pattern 207 formed thereon and a low refraction layer 202 comprising a fill pattern 205 filling at least a portion of the engraved pattern 207 201, the pattern layer includes a low refraction layer formed with at least one relief pattern 207 and a high refraction layer including a fill pattern 205 filling at least a portion of the relief pattern 207 It is possible.

Hereinafter, the first protective layer 30 will be described.

Referring again to FIG. 1, the first passivation layer 30 may be formed on the high refractive index layer 202 to protect the pattern layer 20 and the polarizer 10. The first protective layer 30 and the pattern layer 20 can be integrated. The "integrated" means that the first protective layer 30 and the pattern layer 20 are not separated from each other independently. For example, the first protective layer 30 may be formed in direct contact with the high refractive index layer 202 without interposing an adhesive or the like. Specifically, the high refractive index layer 202 may be formed on the first protective layer 30 Coating layer formed by coating.

The first protective layer 30 may have a thickness of 150 탆 or less, specifically 20 탆 to 150 탆, more specifically 30 탆 to 100 탆. In the above range, it can be used in a liquid crystal display device.

The thickness ratio (thickness of the pattern layer / thickness of the first protective layer) of the thickness of the pattern layer 20 to the thickness of the first protective layer 30 is 2 or less, specifically 0.02 to 0.75, more specifically 0.1 to 0.4 . Within this range, it is possible to prevent the loss of reliability due to transmission of external moisture to the polarizing plate, and to improve the curling and lightening of the polarizing plate.

The first protective layer 30 may include a base film formed of an optically transparent resin. Specifically, the resin is selected from the group consisting of a polyester including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like, acrylic, cyclic olefin polymer (COP), triacetyl cellulose , &Lt; / RTI &gt; and the like. The first protective layer 30 may include a base film produced after the modification of the resin described above. Such modification may include copolymerization, branching, cross-linking, or molecular terminal modification, and the like.

The first protective layer 30 can be produced by melt-extruding the resin, and uniaxially stretching the melt-extruded film only in TD (transverse direction) by 2 to 10 times.

The first protective layer 30 is a TD uniaxially stretched film as described above, and the polarizer 10 is an MD uniaxially stretched film as described above. In the polarizing plate 100, the TD of the first protective layer 30 and the MD of the polarizer 10 may be substantially orthogonal. As a result, the occurrence of warping of the polarizing plate 100 can be prevented. As used herein, "substantially orthogonal" may include not only the case where the TD of the first protective layer 30 and the MD of the polarizer 10 are orthogonal to each other, but also a case where there is some error at 90 degrees.

Although not shown in FIG. 1, a functional layer may be further formed on the upper surface of the first protective layer 30. The functional layer may include, but is not limited to, one or more of an antireflection layer, a low reflection layer, a hard coating layer, and a translucent layer.

Hereinafter, the adhesive layer 40 will be described.

The adhesive layer 40 may be formed between the polarizer 10 and the pattern layer 20 to adhere the polarizer 10 and the pattern layer 20 to each other. The adhesive layer 40 may be formed from a composition for an ordinary adhesive layer. In one embodiment, the composition for the adhesive layer may comprise an epoxy resin, a (meth) acrylic monomer, a photo radical initiator, and a cationic ion initiator. In another embodiment, the composition for the adhesive layer may comprise a polyvinyl alcohol-based water-based adhesive. The composition for the adhesive layer can further enhance the light diffusion effect by further including the above-mentioned light diffusing agent.

The thickness of the adhesive layer 40 may be 1 占 퐉 to 20 占 퐉, specifically 1 占 퐉 to 10 占 퐉, more specifically 1 占 퐉 to 5 占 퐉. Within the above range, the adhesive force is excellent and it can contribute to the thinning of the polarizing plate.

Hereinafter, a method for manufacturing a polarizing plate according to an embodiment of the present invention will be described.

The polarizing plate according to this embodiment can be manufactured by laminating a laminate of the first protective layer and the pattern layer and the polarizer.

First, a laminate of the first protective layer and the pattern layer is produced. Specifically, a composition for a high-refractive-index layer is coated on one surface of the first protective layer. The coating thickness may be 40 占 퐉 or less, specifically 3 占 퐉 to 40 占 퐉, more specifically, 5 占 퐉 to 30 占 퐉. The coating method is not particularly limited, and specifically, it may be a bar coating, a die coating, a slip coating, or the like. Then, the pattern is transferred using a pattern film formed with a filling pattern and a flat portion on the coating layer to form a high-refraction layer. Then, the composition for a low refractive layer is filled and coated in a pattern and cured to form a low refractive layer. The curing may include one or more of light curing, heat curing. Photocuring may include irradiation of 10mJ / cm ² to 1000mJ / cm ² intensity at a wavelength of 400nm or less. The thermosetting may include a heat treatment at 40 占 폚 to 200 占 폚 for 1 hour to 30 hours. Within the above-mentioned range, the resin for pattern layer or the composition for pattern layer is sufficiently cured, and the hardness of the pattern layer can be increased. When formed as described above, the pattern layer may be formed by directly contacting the first protective layer with a coating layer formed on the first protective layer.

Next, a composition for an adhesive layer is coated on one surface of the pattern layer, followed by laminating with a polarizer, followed by curing to produce a polarizing plate. The curing may include one or more of the photocuring, thermal curing described above.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 3 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.

Referring to FIG. 3, a polarizing plate 200 according to another embodiment of the present invention may include a polarizer 10, a pattern layer 21, a first protective layer 30, and an adhesive layer 40. By including the pattern layer 21, it is possible to reduce the width of the engraved pattern relative to the pattern layer 20, thereby improving the moiré effect and reducing the height of the engraved pattern, thereby making the pattern layer thinner. The polarizer 10, the first protective layer 30 and the adhesive layer 40 are substantially the same as those described in the polarizer according to the embodiment of the present invention. do.

The pattern layer 21 is formed on the polarizer 10 and can diffuse the polarized light incident from the polarizer 10. As a result, it is possible to increase the side contrast ratio, improve the viewing angle and visibility of the side surface, and improve the luminance uniformity.

3, the pattern layer 21 according to the present embodiment includes a high refractive index layer 209 in which at least one intaglio prism pattern 211 is formed, and a high refractive index layer 209 in which at least one fill pattern Refractive layer 208 including a low refractive index layer 210.

Fig. 3 shows a polarizing plate including an intaglio prism pattern 211 whose cross section is triangular. However, it may include an engraved prism pattern whose cross section is an n-angular shape (n is an integer of 4 to 10). 3 shows a pattern layer having no flat portion between the intaglio prism pattern 211 and the intaglio prism pattern 211. However, the flat portion of Fig. 1 may also be formed between the intaglio prism patterns 211. Fig. In addition, the irregularities are further formed in the intaglio prism pattern 211 of FIG. 3, so that the light diffusion effect can be increased.

The maximum width P3 of the negative prism pattern 211 may be 20 占 퐉 or less, specifically, 7 占 퐉 to 15 占 퐉. The maximum height H3 of the engraved prism pattern 211 may be 3 탆 to 16 탆, specifically, 4 탆 to 16 탆. The intaglio prism pattern 211 may have a vertex angle? Of 55 to 90 degrees, specifically, 65 to 80 degrees. The oblique prism pattern 211 is not limited by the aspect ratio, but may be, for example, 1 or less, specifically 0.50 to 0.96, more specifically 0.6 to 0.8. In the range of width, height, apex angle and aspect ratio, the diffusion efficiency in the condensed light can be good.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 4 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

4, a polarizer 300 according to another embodiment of the present invention includes a polarizer 10, a pattern layer 22, A first protective layer 30 and an adhesive layer 40. [ The polarizer 10, the first protective layer 30 and the adhesive layer 40 are substantially the same as those of the polarizer according to the first embodiment of the present invention.

The pattern layer 22 may include a low refraction layer 212 and a high refraction layer 213. The high refractive index layer 213 may include at least one engraved pattern 214 and at least one flat portion 215 and a curved surface 216 may be formed at an interface between the engraved pattern 214 and the flat portion 215. As a result, the diffusion effect of condensed light can be larger. The low refractive layer 212 may include one or more fill patterns 217 that fill at least a portion of the engraved pattern 214.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 5 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

Referring to FIG. 5, a polarizer 400 according to another embodiment of the present invention may include a polarizer 10, a pattern layer 20, a second protective layer 50, and an adhesive layer 40. Except that the pattern layer 20 is formed on the second passivation layer 50 and the high refractive index layer 202 is formed between the adhesive layer 40 and the low refractive layer 201. In this embodiment, Is substantially the same as the polarizing plate. Hereinafter, only the second protective layer 50 will be described.

The second passivation layer 50 may be formed under the low refractive layer 201 to support the pattern layer 20.

The second protective layer 50 may be a film formed of an optically transparent resin. Specifically, the resin may include at least one of TAC, PET, COP, and acrylic resin. More specifically, it may include at least one of TAC, COP, and acrylic resin. The second protective layer 50 may comprise a film produced after the above-mentioned denaturation of the resin. Such modification may include copolymerization, branching, cross-linking, or molecular terminal modification, and the like.

The second protective layer 50 may have a viewing angle compensation function with a predetermined range of retardation. Specifically, the second protective layer 40 may have a retardation (Re) in the plane direction of 40 nm to 60 nm. The viewing angle can be compensated in the above range to improve the image quality.

The thickness of the second protective layer 50 may be 150 탆 or less, specifically 20 탆 to 150 탆, more specifically 30 탆 to 100 탆. In the above range, it can be used for a polarizing plate.

The thickness ratio of the thickness of the pattern layer 20 to the thickness of the second protective layer 50 (thickness of the pattern layer / thickness of the second protective layer) is 2 or less, specifically 0.02 to 0.75, more specifically 0.1 to 0.4 . Within this range, it is possible to prevent the loss of reliability due to transmission of external moisture to the polarizing plate, and to improve the curling and lightening of the polarizing plate.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 6 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

6, a polarizer 500 according to another embodiment of the present invention includes a first protective layer 30, a pattern layer 20, a polarizer 10, an adhesive layer 40, and a second protective layer 50 ). Except that an adhesive layer 40 and a second protective layer 50 are further formed on the lower surface of the polarizer 10 according to an embodiment of the present invention. By further forming the adhesive layer 40 and the second protective layer 50, warping of the polarizing plate can be further suppressed. 6 shows a polarizing plate in which the adhesive layer 40 is the same between the polarizer 10 and the pattern layer 20 and between the polarizer 10 and the second protective layer 50. The polarizer 10 and the pattern layer 20 And the adhesive layer formed between the polarizer 10 and the second protective layer 50 may be different in thickness, composition, and the like.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 7 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

7, a polarizer 600 according to another embodiment of the present invention includes a first protective layer 30, an adhesive layer 40, a polarizer 10, a pattern layer 20, and a second protective layer 50 ). Is substantially the same as the polarizing plate according to the embodiment of Fig. 5 except that the adhesive layer 40 and the first protective layer 30 are further formed on the upper surface of the polarizer 10. By further forming the adhesive layer 40 and the first protective layer 30, warping of the polarizing plate can be further suppressed. 7 shows a polarizer in which the adhesive layer 40 is the same between the polarizer 10 and the first protective layer 30 and between the polarizer 10 and the pattern layer 20, Each of the adhesive layers formed between the polarizer 10 and the pattern layer 20 may be different in thickness, composition, and the like.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 8 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

8, a polarizing plate 700 according to another embodiment of the present invention includes a first protective layer 30, a pattern layer 21, an adhesive layer 40, a polarizer 10, and a second protective layer 50 ). Except that the adhesive layer 40 and the second protective layer 50 are further formed on the lower surface of the polarizer 10 as shown in Fig. 8 shows a polarizer in which the adhesive layer 40 is the same between the polarizer 10 and the pattern layer 21 and between the polarizer 10 and the second protective layer 50. The polarizer 10 and the pattern layer 21 And the adhesive layer formed between the polarizer 10 and the second protective layer 50 may be different in thickness, composition, and the like.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 9 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

9, a polarizer 800 according to another embodiment of the present invention includes a first protective layer 30, an adhesive layer 40, a polarizer 10, a pattern layer 21, and a second protective layer 50 ). 8 except that the pattern layer 21 is formed between the adhesive layer 40 and the second protective layer 50. The polarizing plate according to the embodiment of Fig. 9 shows a polarizer in which the adhesive layer 40 is the same between the polarizer 10 and the first protective layer 30 and between the polarizer 10 and the pattern layer 21, The adhesive layer formed between the polarizer 10 and the pattern layer 21 may be different in thickness, composition, and the like.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 10 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

10, a polarizer 900 according to another embodiment of the present invention includes a polarizer 10, a pattern layer 20, a first protective layer 31, an adhesive layer 40, and a second protective layer 50 ). The polarizer 10, the pattern layer 20, the adhesive layer 40, and the second protective layer 50 are substantially the same as those described in the polarizing plate according to another embodiment of the present invention in Fig. 6, 1 protective layer 31 will be mainly described.

The first protective layer 31 may be formed on the pattern layer 20 to protect and support the pattern layer 20. The first protective layer 31 and the pattern layer 20 can be integrated. The "integral" means that the first protective layer 31 and the pattern layer 20 are not separated from each other independently. For example, the first protective layer 31 may be formed in direct contact with the high refractive index layer 202 without interposing an adhesive or the like. Specifically, the high refractive index layer 202 may be formed on the first protective layer 31 Coating layer formed by coating.

The first protective layer 31 may have a light transmittance of 90% or more, specifically 90% to 99% at a wavelength of 550 nm. In the above range, it is not necessary to increase the transmittance of the polarizer by increasing the transmittance of the polarizer in the lamination of the polarizer, and as a result, the polarization degree of the polarizer can be further increased.

The first protective layer 31 may have a thickness of 150 탆 or less, specifically 20 탆 to 150 탆, more specifically 30 탆 to 100 탆. In the above range, it can be used in a liquid crystal display device.

The first protective layer 31 may have a retardation (Re) in the plane direction of 10,000 nm or more, specifically, more than 10,000 nm, more specifically, 10,100 nm to 50,000 nm, and more specifically, 10,100 nm to 15,000 nm. In the above range, it is possible to prevent rainbow stains from appearing, improve the rainbow mura, minimize light leakage at the side, and prevent the phase difference value according to the incident angle of light from changing.

The thickness direction retardation (Rth) of the first protective layer 31 may be 15,000 nm or less, specifically 10,000 nm to 12,000 nm. The nx-ny of the first protective layer 31 may be 0.1 to 0.2. In the above-mentioned range, the change of the retardation value is reduced according to the incident angle and the wavelength, thereby making it possible to prevent rainbow spots from occurring. The first protective layer 31 may have a biaxial degree NZ of 1.8 or less, specifically 1.5 to 1.8, more specifically 1.5 to 1.7. In this range, it is possible to prevent rainbow spots from occurring, to block light leakage from the side surface, to prevent the retardation value from changing according to the incident angle, and to minimize the difference in retardation value according to the wavelength. The ratio Rth / Re of the thickness direction retardation Rth to the retardation Re in the plane direction of the first protective layer 31 may be 1.3 or less, specifically 1.0 to 1.2. In the above range, rainbow stains can be prevented from occurring.

The functional coating layer may be further formed on one side of the first protective layer 31.

Although not shown in FIG. 10, the first protective layer 31 may include a base film and a primer layer formed on at least one side of the base film.

The base film supports the first protective layer 31, and the transmittance of the first protective layer 31 can be increased by having a refractive index ratio in a predetermined range with respect to the primer layer. Specifically, the ratio of the refractive index of the primer layer to the refractive index of the base film (the refractive index of the primer layer / the refractive index of the base film) is 1.0 or less, specifically 0.6 to 1.0, more specifically 0.69 to 0.95, , More specifically from 0.72 to 0.88. In the above range, the transmittance of the first protective layer can be increased.

The base film may have a refractive index of 1.3 to 1.7, specifically 1.4 to 1.6. Within this range, it can be used as the base film of the first protective layer of the polarizing plate, and the refractive index of the primer layer can be controlled easily, and the transmittance of the first protective layer can be increased.

The base film may have a retardation (Re) in the plane direction of 10,000 nm or more, specifically, more than 10,000 nm, more specifically, 10,100 nm to 50,000 nm, and more specifically, 10,100 nm to 15,000 nm. In the above range, it is possible to prevent iridescent irregularities, improve rainbow irregularities, prevent light leakage at the sides, prevent the retardation value from varying according to the incident angle, and minimize the difference in retardation value according to wavelengths.

The base film may have a thickness direction retardation (Rth) of 15,000 nm or less, specifically 10,000 nm to 12,000 nm. The base film may have nx-ny of 0.1 to 0.2. In the above-mentioned range, the change of the retardation value is reduced according to the incident angle and the wavelength, thereby making it possible to prevent rainbow spots from occurring. The base film may have a degree of biaxiality (NZ) of 1.8 or less, specifically 1.5 to 1.8, more specifically 1.5 to 1.7. In this range, it is possible to prevent rainbow spots from occurring, to block light leakage from the side surface, to prevent the retardation value from changing according to the incident angle, and to minimize the difference in retardation value according to the wavelength. The base film may have a ratio (Rth / Re) of the retardation in the thickness direction (Rth) to the retardation (Re) in the plane direction of 1.3 or less, specifically 1.0 to 1.2. In the above range, rainbow stains can be prevented from occurring.

The base film may have a thickness of 150 mu m or less, specifically 20 mu m to 150 mu m, more specifically 30 mu m to 100 mu m. Within this range, it can be used as the base film of the first protective layer.

The base film may be a monoaxially stretched film formed of an optically transparent resin. Specifically, the resin is selected from the group consisting of a polyester including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like, acrylic, cyclic olefin polymer (COP), triacetyl cellulose , &Lt; / RTI &gt; and the like. More specifically, the base film includes a film formed of a polyethylene terephthalate resin, thereby improving the strength of the base film and improving the processability of the polarizing plate.

The primer layer is formed between the base film and the pattern layer 20 and directly above (above) the pattern layer 20, so that adhesion between the base film and the pattern layer 20 can be enhanced.

The primer layer may have a refractive index of 1.0 to 1.6, specifically 1.1 to 1.6, more specifically 1.1 to 1.5. In the above range, it can be used for a polarizing plate and has an appropriate refractive index compared to a base film, so that the transmittance of the first protective layer can be increased.

The primer layer may have a thickness of 1 nm to 200 nm, specifically 60 nm to 200 nm. In the above range, it can be used for a polarizing plate and has an appropriate refractive index with respect to a base film, so that the transmittance of the first protective layer can be increased, and brittle phenomenon can be eliminated.

The primer layer may be a non-urethane primer layer containing no urethane group. Specifically, the primer layer may be formed of a composition for a primer layer comprising a resin such as polyester, acryl, or a monomer. By controlling the mixing ratio (e.g., molar ratio) of these monomers, the refractive index can be provided. The composition for the primer layer may further contain at least one additive such as a UV absorber, an antistatic agent, a defoaming agent, and a surfactant.

The first protective layer 31 may be formed by a method similar to the first protective layer 30 described above, forming a primer layer on at least one side of the base film. Specifically, the first protective layer 31 can be manufactured by forming a primer layer on at least one side of the base film and uniaxially stretching by 2 to 10 times in TD (transverse direction), but is not limited thereto. The first protective layer 31 may be prepared by stretching the melt-extruded film by TD in 2 to 10 times uniaxial stretching, followed by heat treatment at a predetermined range of temperatures and tension-relaxation and TD stretching . The heat treatment is carried out at a temperature equal to or higher than the Tg of the resin, specifically, 100 占 폚 to 300 占 폚 for 1 second to 2 hours. The TD stretching ratio may be 0 to 3 times, specifically 0.1 to 2 times, more specifically 0.1 to 1 time. The retardation value of the protective layer can be maintained in the temperature and the stretching ratio range, and crystallization and stabilization of the first protective layer can be performed well.

10 shows a polarizing plate in which the adhesive layer 40 is the same between the polarizer 10 and the pattern layer 20 and between the polarizer 10 and the second protective layer 50. The polarizer 10 and the pattern layer 20 And the adhesive layer formed between the polarizer 10 and the second protective layer 50 may be different in thickness, composition, and the like.

Hereinafter, a polarizing plate according to another embodiment of the present invention will be described with reference to FIG. 11 is a cross-sectional view of a polarizer according to another embodiment of the present invention.

11, a polarizer 1000 according to another embodiment of the present invention includes a polarizer 10, a pattern layer 20, a first protective layer 31, an adhesive layer 40, a second protective layer 50 And an adhesive layer 60 as shown in Fig. The pressure sensitive adhesive layer 60 is further formed on the lower surface of the second protective layer 50 so that the polarizing plate can be adhered to the liquid crystal panel. The polarizer 10, the pattern layer 20, the first protective layer 31, the adhesive layer 40 and the second protective layer 50 are substantially the same as those of the polarizer of FIG. .

The adhesive layer 60 may be formed of a pressure-sensitive adhesive composition comprising a pressure-sensitive adhesive resin such as a (meth) acrylic resin, an epoxy resin, or a silicone resin, a curing agent, and a silane coupling agent.

The (meth) acrylic resin is a (meth) acrylic copolymer having an alkyl group, a hydroxyl group, an aromatic group, a carboxylic acid group, an alicyclic group, a heteroalicyclic group, or the like and may include a conventional (meth) acrylic copolymer. Specifically, a (meth) acrylic monomer having an unsubstituted C1 to C10 alkyl group, a (meth) acrylic monomer having a C1 to C10 alkyl group having at least one hydroxyl group, a (meth) acrylic monomer having an C6 to C20 aromatic group (Meth) acrylic monomer having a carboxylic acid group, a (meth) acrylic monomer having a C3 to C20 alicyclic group, a C3 to C10 heteroalicyclic group having at least one of nitrogen (N), oxygen (O) (Meth) acryl-based monomer having at least one group selected from the group consisting of (meth) acryl-based monomers.

The curing agent may be a bifunctional (meth) acrylate such as hexanediol diacrylate as a polyfunctional (meth) acrylate; Trifunctional (meth) acrylates of trimethylolpropane tri (meth) acrylate; Tetrafunctional (meth) acrylates such as pentaerythritol tetra (meth) acrylate; Pentafunctional (meth) acrylates such as dipentaerythritol penta (meth) acrylate; (Meth) acrylate such as dipentaerythritol hexa (meth) acrylate, but are not limited thereto.

The silane coupling agent may include a conventional silane coupling agent such as 3-glycidoxypropyltrimethoxysilane and the like.

The composition for a pressure-sensitive adhesive layer may comprise 100 parts by weight of a (meth) acrylic resin, 0.1 to 30 parts by weight of a curing agent, and 0.1 to 20 parts by weight of a silane coupling agent. Within this range, the polarizing plate can be adhered well to the liquid crystal panel.

The thickness of the adhesive layer 130 may be 10 占 퐉 to 100 占 퐉. In this range, the polarizer and the liquid crystal panel can be adhered well and used for the polarizer.

11 shows a polarizer in which the adhesive layer 40 is the same between the polarizer 10 and the pattern layer 20 and between the polarizer 10 and the second protective layer 50. The polarizer 10 and the pattern layer 20 And the adhesive layer formed between the polarizer 10 and the second protective layer 50 may be different in thickness, composition, and the like.

Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 12 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.

12, a liquid crystal display 1100 according to an embodiment of the present invention includes a light source 910, a light guide plate 920, a reflection sheet 930, a diffusion sheet 940, a first polarizer 950, A liquid crystal panel 960, and a second polarizing plate 970, and the second polarizing plate 970 may include a polarizing plate according to embodiments of the present invention.

The light source 910 generates light, and may be arranged to face the light guide plate 920. [ As the light source 910, various light sources such as a linear light source lamp, a surface light source lamp, a CCFL, or an LED may be used. A light source cover 911 is further formed outside the light source 910 to protect the light source. 12 shows a case where the light source 910 is disposed only on one side of the light guide plate 920. The light source 910 may be disposed on the other side of the light guide plate 920, It may be disposed directly underneath.

The light guide plate 920 is disposed on the side surface of the light source 910 and internally reflects the light incident from the light source 910 to be emitted to the diffusion sheet 940.

The diffusion sheet 940 can diffuse the light emitted from the light guide plate 920 and output it to the first polarizer 950. The diffusion sheet 940 may include a prism sheet on which an optical pattern is formed on a light incident surface, a prism sheet on which an optical pattern is formed on a light emission surface, and the like. The diffusion sheet 940 may include a composite optical sheet in which two or more prism sheets are laminated.

The liquid crystal panel 960 is formed between the first polarizing plate 950 and the second polarizing plate 970 so that light incident from the first polarizing plate 950 can be transmitted through the second polarizing plate 970.

The liquid crystal panel 960 may include a first substrate, a second substrate, and a liquid crystal layer that is a display medium fixed between the first substrate and the second substrate. The first substrate is equipped with a color filter and a black matrix. The second substrate includes a switching element for controlling electro-optical characteristics of the liquid crystal, a switching element for providing a source signal, and a scanning line for providing a gate signal to the signal line, a pixel electrode, and a counter electrode. The liquid crystal layer includes a liquid crystal that is uniformly oriented when the electric field is not visible. Specifically, the liquid crystal layer may include, but is not limited to, a VA (vertical alignment) mode, a PVA (patterned vertical alignment) mode, or an S-PVA (super-patterned vertical alignment) mode.

The first polarizing plate 950 is formed on one surface of the liquid crystal panel 960 so as to face the light output surface of the diffusion sheet 940 and polarizes the light incident from the diffusion sheet 940 to exit the liquid crystal panel 960 . The first polarizing plate 950 may include a polarizer and a protective film formed on at least one side of the polarizer. The polarizer and the protective film are in accordance with the ordinary contents known to those skilled in the art.

The reflective sheet 930 is formed on the lower surface of the light guide plate 920 and reflects the light emitted from the light source 910 and reflects the light to the light guide plate 920 to increase the light efficiency.

12 illustrates a case where the second polarizing plate 970 includes the polarizing plate according to the embodiments of the present invention, but the first polarizing plate 950 may include the polarizing plate according to the embodiments of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples.

Example 1: Preparation of Polarizer

The polyvinyl alcohol film was stretched three times at 60 ° C, adsorbed iodine, and then stretched 2.5 times in an aqueous boric acid solution at 40 ° C to prepare a polarizer.

An ultraviolet curable resin (Shin-A T & C, SSC155) was coated on one side of a transparent PET film for a first protective layer (Toyobo Co., COSMOSHINE SRF, thickness: 80 μm, Re = 14,000 nm at a wavelength of 550 nm) to obtain a coating. A lenticular lens pattern and a flat portion were engraved on the coating material using a pattern film in which a bent lenticular lens pattern (width: 10 μm, height: 10 μm) and a flat portion (width: 10 μm) To form a high-refraction layer. The high refractive index layer was coated with an ultraviolet ray hardening resin (Shin-A & T, C, SSC140) to completely fill the lenticular lens pattern and to cure the intaglio lenticular lens pattern to form a pattern layer having a low refraction layer formed directly on the high refractive index layer.

An adhesive for polarizing plates (Nippon Goshei, Z-200) was coated on one side of the low refraction layer, and the resultant was combined with the polarizer prepared above and cured to prepare a polarizing plate.

Example 2: Preparation of polarizing plate

A polarizer was prepared in the same manner as in Example 1.

An ultraviolet curable resin (Shin-A T & C, SSC155) was coated on one side of a transparent PET film for a first protective layer (Toyobo Co., COSMOSHINE SRF, thickness: 80 μm, Re = 14,000 nm at a wavelength of 550 nm) to obtain a coating. A prismatic pattern of a negative angle was applied to the coating using a film formed with a prismatic pattern of a positive angle (width: 13 탆, height: 10 탆, apex angle: 65.5 °, cross-section: triangle) and a high refractive index layer was formed . The high refractive index layer was coated with an ultraviolet curable resin (Shin-A & T, C, SSC140) to completely fill the prism pattern and to cure the prism pattern to form a pattern layer having a low refraction layer on the high refractive index layer.

An adhesive for polarizing plates (Nippon Goshei, Z-200) was coated on one side of the low refraction layer, and the resultant was combined with the polarizer prepared above and cured to prepare a polarizing plate.

Example 3: Preparation of polarizing plate

A polarizer was prepared in the same manner as in Example 1.

An ultraviolet curable resin (Shin-A T & C, SSC155) was coated on one side of a transparent PET film for a first protective layer (Toyobo Co., COSMOSHINE SRF, thickness: 80 μm, Re = 14,000 nm at a wavelength of 550 nm) to obtain a coating. A lenticular lens pattern and a flat portion of a negative lenticular lens were applied to the coating using a film in which a bent lenticular lens pattern (width: 10 mu m, height: 10 mu m) and a flat portion (width: 10 mu m) , To form a high-refraction layer. The high refractive index layer was coated with an ultraviolet curable resin (Shin-A & T, C, SSC143) to completely fill the cemented lenticular lens pattern and cure to form a pattern layer having a low refraction layer formed directly on the high refractive index layer.

(Nippon Goshei Company, Z-200) was coated on one surface of each of a low reflection layer, a second protective layer TAC film (Konica Corp., KC4DR-1, thickness: 40 m), and a low refractive layer, 2 protective layer TAC film were laminated in this order and cured to prepare a polarizing plate.

Example 4: Preparation of Polarizer

A polarizer was prepared in the same manner as in Example 1.

An ultraviolet curable resin (Shin-A T & C, SSC155) was coated on one side of a transparent PET film for a first protective layer (Toyobo Co., COSMOSHINE SRF, thickness: 80 μm, Re = 14,000 nm at a wavelength of 550 nm) to obtain a coating. A prismatic pattern of a negative angle was applied to the coating using a film formed with a prismatic pattern of a positive angle (width: 13 탆, height: 10 탆, apex angle: 65.5 °, cross-section: triangle) and a high refractive index layer was formed . The high refractive index layer was coated with an ultraviolet ray curable resin (Shin-A & T, C, SSC143) to completely fill the prismatic pattern and to cure the low refractive index layer to form a pattern layer having a low refractive index.

(Nippon Goshei Company, Z-200) was coated on one surface of each of a low reflection layer, a second protective layer TAC film (Konica Corp., KC4DR-1, thickness: 40 m), and a low refractive layer, 2 protective layer TAC film were laminated in this order and cured to prepare a polarizing plate.

Example 5: Preparation of polarizing plate

A polarizer was prepared in the same manner as in Example 1.

(SSC155, ShinA T & C) was coated on one side of a transparent PET film for a first protective layer (Toyobo Co., COSMOSHINE SRF, thickness: 80 μm, Re = 14,000 nm at a wavelength of 550 nm) to obtain a coating. A lenticular lens pattern and a flat portion of a negative lenticular lens were applied to the coating using a film in which a bent lenticular lens pattern (width: 10 mu m, height: 10 mu m) and a flat portion (width: 10 mu m) , To form a high-refraction layer. The high refractive index layer was coated with an ultraviolet curable resin (Shin-A & T, C, SSC143) to completely fill the cemented lenticular lens pattern and cure to form a pattern layer having a low refraction layer formed directly on the high refractive index layer.

(Nippon Goshei Company, Z-200) was coated on one surface of each of a low refraction layer and a second protective layer COP film (Zeon Co., ZB12, thickness: 50 m), and a low refractive layer, a polarizer, Layer COP film were laminated in this order and cured to prepare a polarizing plate.

Example 6: Preparation of polarizing plate

A polarizer was prepared in the same manner as in Example 1.

An ultraviolet curable resin (Shin-A T & C, SSC155) was coated on one side of a transparent TAC film for a first protective layer (Konica Corp., KC4DR-1, thickness: 40 m) to obtain a coating. A lenticular lens pattern and a flat portion of a negative lenticular lens were applied to the coating using a film in which a bent lenticular lens pattern (width: 10 mu m, height: 10 mu m) and a flat portion (width: 10 mu m) , To form a high-refraction layer. The high refractive index layer was coated with an ultraviolet curable resin (Shin-A & T, C, SSC143) to completely fill the cemented lenticular lens pattern and cure to form a pattern layer having a low refraction layer formed directly on the high refractive index layer.

(Nippon Goshei Company, Z-200) was coated on one surface of each of a low reflection layer, a second protective layer TAC film (Konica Corp., KC4DR-1, thickness: 40 m), and a low refractive layer, 2 protective layer TAC film were laminated in this order and cured to prepare a polarizing plate.

Example 7: Preparation of polarizing plate

A polarizer was prepared in the same manner as in Example 1.

An ultraviolet curable resin (Shin-A T & C, SSC155) was coated on one side of a transparent COP film for a first protective layer (Zeon Co., ZB12, thickness: 50 m) to obtain a coating. A lenticular lens pattern and a flat portion of a negative lenticular lens were applied to the coating using a film in which a bent lenticular lens pattern (width: 10 mu m, height: 10 mu m) and a flat portion (width: 10 mu m) , To form a high-refraction layer. The high refractive index layer was coated with an ultraviolet curable resin (Shin-A & T, C, SSC143) to completely fill the cemented lenticular lens pattern and cure to form a pattern layer having a low refraction layer formed directly on the high refractive index layer.

(Nippon Goshei Company, Z-200) was coated on one surface of each of a low reflection layer, a second protective layer TAC film (Konica Corp., KC4DR-1, thickness: 40 m), and a low refractive layer, 2 protective layer TAC film were laminated in this order and cured to prepare a polarizing plate.

Comparative Example 1: Production of Polarizing Plate

A polarizer was prepared in the same manner as in Example 1.

A transparent polarizing film (Toyobo Co., COSMOSHINE SRF, thickness: 80 탆, Re: 14,000 nm at a wavelength of 550 nm) and a TAC film for a second protective layer were laminated on one surface and the other surface of the second polarizer, (Konica Corp., KC4DR-1, thickness: 40 占 퐉) were coated with a polarizing plate adhesive (Nippon Goshei, Z-200). A transparent PET film for the first protective layer, a polarizer and a TAC film for the second protective layer were laminated in this order and cured to prepare a polarizing plate.

The composition of the polarizing plates prepared in Examples and Comparative Examples is shown in Table 1 below. The physical properties of the following Table 1 were also evaluated. To this end, a module for a liquid crystal display device was manufactured by the following method.

Production Example 1: Preparation of Polarizing Plate

The polyvinyl alcohol film was stretched three times at 60 ° C, adsorbed iodine, and then stretched 2.5 times in an aqueous boric acid solution at 40 ° C to prepare a polarizer. A triacetyl cellulose film (thickness: 80 占 퐉) was bonded to both sides of the polarizer using an adhesive for polarizing plates (Nippon Goshei, Z-200) to prepare a polarizing plate.

Production Example 2: Production of composite optical sheet

35% by weight of epoxy acrylate, 15% by weight of Urethane Acrylate Oligomer, 36% by weight of Ortho phenyl phenol ethoxylated acrylate, 9% by weight of trimethylolpropane 9- 10% by weight of trimethylolpropane 9-ethoxylated acrylate, and 4% by weight of a photoinitiator.

The composition was coated on one side of a transparent PET (polyethylene terephthalate) film for a first base film (Mitsubishi, T910E, thickness: 125 탆) to obtain a coating. The prism pattern was applied and cured to the coating using a pattern roll having a prism pattern (height: 12 탆, width: 24 탆, triangle having a vertex angle of 90 °, aspect ratio: 0.5) To thereby form the first optical sheet.

The composition was coated on one side of a transparent PET (polyethylene terephthalate) film for a second base film (Mitsubishi, T910E, thickness: 125 탆) to obtain a coating. A pattern was applied and cured by using a pattern roll having a prism pattern (height: 12 탆, width: 24 탆, triangle having a vertex angle of 90 °, aspect ratio: 0.5) 2 optical sheets were formed.

The second optical sheet was laminated on the first optical sheet so that the longitudinal directions of the first prism pattern and the second prism pattern were orthogonal to each other to produce a composite optical sheet.

Manufacturing Example 3: Fabrication of Module for Liquid Crystal Display Device

The polarizing plate of Example or Comparative Example, the liquid crystal panel (PVA mode) and the polarizing plate of Production Example 1 were adhered in this order, and the composite optical sheet of Production Example 2 was assembled at the lower part of the polarizing plate of Production Example 1, .

 (1) Luminance: Liquid crystal display device incorporating a LED light source, a light guide plate, and a module for a liquid crystal display device and including a one-sided edge type LED light source (except for the configuration of a module for a liquid crystal display device of Examples and Comparative Examples, UN32H5500)) was prepared. The front luminance value was measured using EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM). The relative luminance was calculated as {(luminance value of the embodiment and comparative example) / (luminance value of the comparative example 1)} x 100.

 (2) 1/2 Viewing Angle and 1/3 Viewing Angle: A liquid crystal display was manufactured in the same manner as in (1), and the luminance value was measured using EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM). The 1/2 viewing angle and the 1/3 viewing angle mean a viewing angle having a luminance of 1/2 or 1/3 of the front luminance, respectively.

(3) Contrast ratio: A liquid crystal display was manufactured in the same manner as in (1), and the contrast ratio was measured in the spherical coordinate system (?,?) Using EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM).

(4) Luminance uniformity and luminance uniformity change ratio: A screen of a LED light source, a light guide plate, a module for a liquid crystal display device, and a display device having a major axis and a minor axis was assembled to obtain a liquid crystal display device having a screen size of 50 inches or 55 inches . 13, when the center point of the display device is B, the left end point is A, and the right end point is C, in a liquid crystal display device in which a light source, a light guide plate, and a module for a liquid crystal display device are assembled, B and C are measured, and the maximum luminance value (luminance max) and the minimum luminance value (luminance min) are obtained. The luminance uniformity is a value calculated as {(luminance min) / (luminance max)} x 100. At this time, the brightness is measured by fixing EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM Co.) to point B and changing the measuring direction of the luminance meter to each of points A, B and C. From this, the luminance uniformity (a) in the case of 50 inches and the luminance uniformity (b) in the case of 55 inches are obtained, respectively. The luminance uniformity change rate is calculated as {| b-a | / a} x 100.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 1 Protective layer  The first protective layer PET PET PET PET PET TAC COP PET  The second protective layer none none TAC TAC COP TAC TAC TAC High-refraction layer Refractive index 1.57 1.57 1.57 1.57 1.57 1.57 1.57 - Engraved pattern Lenticular prism Lenticular prism Lenticular Lenticular Lenticular - Aspect ratio of engraved pattern 1.0 0.77 1.0 0.77 1.0 1.0 1.0 - Flatness has exist none has exist none has exist has exist has exist - Low refraction layer Refractive index 1.42 1.42 1.45 1.45 1.45 1.45 1.45 - Luminance The center luminance value (nit) 182 183 192 193 191 194 192 241 Relative luminance
(%) 75.5 75.9 79.7 80.1 79.3 80.5 79.7 100 1/2 Viewing Angle (°) Right and left 65.5 70.3 62.9 67.5 63.1 62.9 63.2 50.4 Upper and Lower 46.1 43.8 46.0 43.5 46.0 46.1 45.8 46.0 1/3 Viewing Angle (°) Right and left 82.2 82.5 77.5 77.8 77.9 77.7 77.6 60.6 Upper and Lower 57.0 54.9 57.2 57.6 57.2 57.1 57.5 56.6 Contrast ratio (0 [deg.], 0 [deg.]) 12776 10389 12583 10285 12489 12469 12366 20207 (180 DEG, 0 DEG) 1383 1546 1416 1540 1435 1425 1422 959 (0 [deg.], 60 [deg.]) 1436 1579 1434 1582 1425 1445 1427 973 Luminance uniformity (%) 50 inches 80.5 71.7 80.3 71.5 80.1 80.3 80.0 66.1 55 inches 77.1 70.7 77.8 71.2 77.5 77.7 76.8 61.1 Change in luminance uniformity (%) 4.22 1.39 3.11 0.42 3.25 3.24 4 7.56

As shown in Table 1, the module for a liquid crystal display device according to the present embodiment can increase the luminance value at the front side, increase the side viewing angle by increasing the half viewing angle and the 1/3 viewing angle, The contrast ratio can be increased. In addition, it is possible to increase the brightness uniformity, minimize the rate of change of luminance uniformity according to the size of the liquid crystal display device, and change the size of the liquid crystal display device.

In Comparative Example 1 in which the polarizing plate of this example was not employed, the relative brightness was high, but the viewing angle and contrast ratio improvement effect was low. In Comparative Example 1 in which the polarizing plate of this embodiment is not used, the brightness uniformity is low compared to the present embodiment, and the rate of change of the luminance uniformity according to the size of the liquid crystal display device is large, so that the processability and economical efficiency may be deteriorated.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (23)

Polarizers,
A first adhesive layer formed on one surface of the polarizer,
A pattern layer formed on the first adhesive layer, the pattern layer including a high refraction layer having at least one indentation pattern and a low refraction layer including a fill pattern filling at least a part of the depressed pattern;
And a first protective layer formed on the pattern layer,
Wherein the first protective layer comprises a base film formed of at least one of triacetyl cellulose, polyethylene terephthalate, cyclic olefin polymer, and acrylic resin,
Wherein the refractive index of the high refractive index layer is larger than the refractive index of the low refractive index layer. The polarizing plate according to claim 1, wherein the engraved pattern has an aspect ratio of 1.0 or less. The polarizing plate according to claim 1, wherein the engraved pattern includes an optical pattern including a curved surface or a prism pattern having a triangular to a pentagonal cross section. The polarizing plate according to claim 1, further comprising a flat portion between the engraved pattern and the adjacent engraved pattern. The polarizing plate according to claim 4, wherein the ratio of the maximum width of the engraved pattern to the width of the flat portion is 1 or less. The polarizer according to claim 1, wherein a refractive index difference between the high refraction layer and the low refraction layer is 0.30 or less. The polarizing plate according to claim 1, wherein the ratio of the thickness of the pattern layer to the thickness of the first protective layer is 2 or less. The polarizer according to claim 1, wherein the first protective layer has a retardation (Re) in the plane direction of 10,000 nm or more at a wavelength of 550 nm. The polarizing plate according to claim 1, wherein the first protective layer comprises a base film and a primer layer formed on at least one side of the base film, wherein a ratio of a refractive index of the primer layer to a refractive index of the base film is 1.0 or less. . The polarizer according to claim 9, wherein the first protective layer has a light transmittance of 90% or more at a wavelength of 550 nm. The polarizing plate according to claim 1, wherein the first protective layer has a thickness of 150 탆 or less. The polarizing plate according to claim 1, wherein the first protective layer has a thickness of 30 탆 to 100 탆. The polarizing plate according to claim 1, wherein the first protective layer is obtained by uniaxially stretching a base film formed of the polyethylene terephthalate resin. The optical information recording medium according to claim 1, wherein the adhesive layer, the low refractive index layer and the high refractive index layer are sequentially laminated, the first protective layer is formed on the high refractive index layer,
Wherein the first protective layer is formed of a polyethylene terephthalate resin with a retardation (Re) in the plane direction of 10,000 nm or more at a wavelength of 550 nm. 15. The polarizing plate according to claim 14, wherein the high refractive index layer and the first protective layer are in direct contact with each other. The optical element according to claim 1, wherein the adhesive layer, the high refractive index layer, and the low refractive index layer are sequentially laminated, the first protective layer is formed on the low refractive index layer,
Wherein the first protective layer is formed of at least one of TAC, COP, and acrylic resin. The polarizing plate according to claim 16, wherein the low refractive layer and the first protective layer are in direct contact with each other. The polarizing plate according to claim 15 or 17, wherein the first protective layer has a thickness of 150 탆 or less. The polarizing plate according to claim 15 or 17, wherein the first protective layer has a thickness of 30 탆 to 100 탆. The polarizing plate according to claim 15 or 17, further comprising a second adhesive layer formed on the other surface of the polarizer, and a second protective layer formed on the second adhesive layer. The polarizing plate according to claim 20, wherein the second protective layer comprises a cyclic olefin polymer film, or a film formed of a polyethylene terephthalate resin having a retardation (Re) of 10,000 nm or more at a wavelength of 550 nm. The polarizer of claim 21, further comprising an adhesive layer formed on a lower surface of the second protective layer. A liquid crystal display device comprising the polarizer of claim 1.

Images