KR101871552B1 - Optical film for improving visibility of display, polarizing plate comprising the same, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same - Google Patents

Optical film for improving visibility of display, polarizing plate comprising the same, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same Download PDF

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KR101871552B1
KR101871552B1 KR1020150160740A KR20150160740A KR101871552B1 KR 101871552 B1 KR101871552 B1 KR 101871552B1 KR 1020150160740 A KR1020150160740 A KR 1020150160740A KR 20150160740 A KR20150160740 A KR 20150160740A KR 101871552 B1 KR101871552 B1 KR 101871552B1
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South Korea
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refractive index
layer
pattern
optical film
high refractive
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KR1020150160740A
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Korean (ko)
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KR20170057087A (en
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오영
주영현
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삼성에스디아이 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Abstract

And a visibility improvement layer formed on the substrate layer, wherein the visibility improvement layer comprises a high refractive index pattern layer in which at least one depressed pattern is formed, and a low refractive index pattern layer including a filling pattern filling at least a part of the depressed pattern, Wherein the base layer, the high refractive index pattern layer and the low refractive index pattern layer are sequentially laminated, or the substrate layer, the low refractive index pattern layer and the high refractive index pattern layer are sequentially laminated, Wherein the high refractive index pattern layer has a refractive index greater than that of the low refractive index pattern layer and the high refractive index pattern layer has high refractive index particles having a refractive index larger than that of the high refractive index pattern layer, An optical film for improving the visibility of a display, a polarizing plate including the same, a module for a liquid crystal display including the polarizing plate, A liquid crystal display device is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical film for improving the visibility of a display, a polarizing plate including the optical film, a module for a liquid crystal display including the polarizing plate, and a liquid crystal display device including the optical film and a polarizing plate. SAME AND LIQUID CRYSTAL DISPLAY APPARATUS COMPRISING THE SAME}

The present invention relates to an optical film for improving display visibility, a polarizing plate including the same, a module for a liquid crystal display including the polarizing plate, and a liquid crystal display including the same.

The liquid crystal display device has good color in front of the screen. However, the color contrast and the contrast ratio of the front side of the screen of the liquid crystal display device may be lowered. An optical film for improving visibility including a high refractive index pattern layer and a low refractive index pattern layer may be used on the substrate layer in order to increase the color and contrast ratio on the side. Therefore, the adhesion between the high refractive index pattern layer or the low refractive index pattern layer and the substrate layer must be good. The high refractive index pattern layer is made of a high refractive index resin. Since the high refractive index resin is expensive and has a high viscosity, it may be difficult to produce a high refractive index pattern layer, and adhesion between the high refractive index pattern layer and the substrate layer is also low.

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 an optical film for improving the visibility of a display which can improve side contrast ratio, side viewing angle and visibility.

Another object to be solved by the present invention is to provide an optical film for improving the visibility of the display, which has high adhesion between the visibility improving layer and the base layer and excellent surface hardness.

Another object to be solved by the present invention is to provide an optical film for improving the visibility of a display which is easy to produce a visibility improving layer, has good appearance, and is excellent in optical transparency.

Another object of the present invention is to provide a polarizing plate, a module for a liquid crystal display device, and a liquid crystal display device capable of improving a side contrast ratio, a side viewing angle, and a visibility.

The optical film for improving display visibility of the present invention comprises a base layer and a visibility improvement layer formed on the base layer, wherein the visibility improvement layer comprises a high refractive index pattern layer in which at least one engraved pattern is formed, Wherein the substrate layer, the high-refractive-index pattern layer and the low-refractive-index pattern layer are sequentially laminated, or the substrate layer, the low-refractive-index pattern layer and the low- Wherein the high refractive index pattern layer has a refractive index higher than that of the low refractive index pattern layer and the high refractive index pattern layer has a refractive index higher than that of the high refractive index pattern layer And may include high refractive index particles having a high refractive index and a large refractive index.

The polarizing plate of the present invention may include a polarizer and an optical film for improving the display visibility of the present invention formed on the polarizer.

The module for a liquid crystal display of the present invention comprises a first polarizing plate, a second polarizing plate, a liquid crystal panel interposed between the first polarizing plate and the second polarizing plate, and the second polarizing plate may include the polarizing plate of the present invention .

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

The present invention provides an optical film for improving the visibility of a display capable of improving side contrast ratio, side viewing angle, and visibility.

The present invention provides an optical film for improving the visibility of the display, which has high adhesion between the visibility improving layer and the base layer and excellent surface hardness.

The present invention provides an optical film for improving the visibility of a display which is easy to produce a visibility improving layer, has good appearance, and is excellent in optical transparency.

The present invention provides a polarizing plate, a module for a liquid crystal display device, and a liquid crystal display device capable of improving lateral contrast ratio, lateral viewing angle, and visibility.

1 is a cross-sectional view of an optical film according to an embodiment of the present invention.
2 is a cross-sectional view of an optical film according to an embodiment of the present invention.
3 is an exploded perspective view of the visibility enhancing layer of Fig.
4 is a cross-sectional view of an optical film according to another embodiment of the present invention.
5 is a cross-sectional view of an optical film according to another embodiment of the present invention.
6 is a cross-sectional view of an optical film according to another embodiment of the present invention.
7 is a cross-sectional view of an optical film according to another embodiment of the present invention.
8 is a cross-sectional view of an optical film according to another embodiment of the present invention.
9 is a cross-sectional view of a polarizer according to an embodiment of the present invention.
10 is a schematic cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.
11 is a perspective view of a composite optical sheet of a module for a liquid crystal display 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.
Fig. 13 is a conceptual diagram of an exit angle.

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 the present specification, "horizontal direction" and "vertical direction" mean the longitudinal direction and the single direction of the rectangular liquid crystal display screen, respectively.

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

Referring to FIG. 13, when measuring luminance 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, the term "outgoing angle" When the luminance is measured at -90 ° to + 90 °, and the measured luminance is normalized, when the left-end point is -90 ° and the right-end point is + 90 °, , And the angle of the point at which the luminance is half of the luminance measured at the front face. In Fig. 13, an emission angle is indicated by *.

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).

Means a distance between the maximum width of the engraved pattern of one of the optical films and the width of one first flat portion, that is, the distance between one engraved pattern and the adjacent engraved pattern.

In the present specification, "retardation in the retardation direction (Re)" is expressed by the following formula A and "retardation in thickness direction (Rth)

<Formula A>

Re = (nx - ny) xd

<Formula B>

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

(Where nx, ny and nz are 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, and d is the thickness (unit: nm) of the optical element) .

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

In the present specification, "surface hardness" means a value measured in accordance with JIS K 5600 in a base layer with respect to a sample optical film.

Hereinafter, an optical film for improving display visibility (hereinafter referred to as 'optical film') according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 and 2 are sectional views of an optical film according to an embodiment of the present invention. 3 is an exploded perspective view of the visibility enhancing layer of Fig.

1 and 2, the optical films 1 and 2 according to the present embodiment may include the visibility improving layer 10A and the base layer 20. [

The visibility improvement layer 10A is formed on the base layer 20 and includes a high refractive index pattern layer 12 formed with at least one engraved pattern 11 and a filling pattern 13 filling at least a part of the engraved pattern 11. [ And a low refractive index pattern layer 14 containing a low refractive index pattern layer. Further, the high refractive index pattern layer 12 may include high refractive index particles 16. [ Therefore, even if the height of the engraved pattern is lower than that of the high refractive index pattern layer not including the high refractive index particles, the viewing angle improving effect can be enhanced and the optical film can be made thinner. Further, even if the refractive index of the resin for forming a high refractive index pattern layer is not increased, a high refractive index can be sufficiently secured. Fig. 1 illustrates a structure in which a base layer 20, a high refractive index pattern layer 12 and a low refractive index pattern layer 14 are sequentially laminated. Fig. 2 shows a structure in which a base layer 20, a low refractive index pattern layer 14, And a high refractive index pattern layer 12 are sequentially laminated.

The high refractive index pattern layer 12 can be formed on the base layer 20 and the diffusion effect of condensation can be increased by diffusing the light that has reached the low refractive index pattern layer 14 in the optical display device.

The refractive index of the high refractive index pattern layer 12 may be higher than that of the low refractive index pattern layer 14. [ Specifically, the refractive index difference between the high refractive index pattern layer 12 and the low refractive index pattern layer 14 may be 0.20 or less, specifically 0.10 to 0.20, more specifically 0.10 to 0.18. In the above range, the effect of improving the diffusion of the light and improving the visibility can be great, and the polarization diffusing effect can be excellent. The refractive index of the high refractive index pattern layer 12 may be 1.50 or more, specifically 1.50 to 1.70. Within this range, the light diffusion effect can be excellent. The high refractive index pattern layer 12 may be formed of an ultraviolet curable composition containing at least one of (meth) acrylic, polycarbonate, silicone, and epoxy resin, but is not limited thereto.

The engraved pattern 11 may include a curved surface, and the curved surface serves as a lens, and the light incident from the low refractive index pattern layer 14 may be diffused by refracting in various directions depending on the arrival position. 1 shows an optical film 1 in which the curved surface is an aspherical surface and the engraved pattern 11 is a lenticular lens pattern. However, the curved surface may be a spherical surface, parabolic surface, ellipsoidal surface, hyperbolic surface, or amorphous curved surface, and the engraved pattern 11 may be a prism pattern having a curved surface formed on the lower surface and a triangular- 1 shows the optical film having a smooth curved surface, but the curved surface may be further provided with concavity and convexity to further enhance the diffusion effect. The engraved pattern 11 may have an aspect ratio of 1.0 or less, specifically 0.4 to 1.0, more specifically 0.7 to 1.0. In the above range, the contrast ratio on the side and the viewing angle on the side can be improved. The maximum width P1 of the engraved pattern 11 may be 15 占 퐉 or less, specifically 5 占 퐉 to 10 占 퐉. The maximum height H1 of the engraved pattern 11 may be 15 占 퐉 or less, specifically 5 占 퐉 to 10 占 퐉. In the range of width and height, there may be diffusion effect. The sum of the maximum widths of the engraved patterns 11 may be 40% to 60%, specifically 45% to 55% of the entire width of the high refractive index pattern layer 12. In the above range, it is possible to improve the contrast ratio and luminance uniformity at the side and improve the viewing angle at the side. Since the engraved pattern 11 is arranged at a predetermined period C, the effect of diffusing condensed light can be large. Concretely, the period C of the engraved pattern 11 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. FIG. 1 shows an optical film on which an engraved pattern 11 having the same aspect ratio, maximum width, and maximum height is formed, but an engraved pattern having different aspect ratios, maximum widths, or maximum heights may be formed on the optical film.

A first flat portion 15 may be formed between the engraved pattern 11 and the engraved pattern 11. [ The light reaching the first flat portion 15 is totally reflected and emitted by the engraved pattern 11 to diffuse the condensed light. The width P2 of the first flat portion 15 may be equal to or greater than the maximum width P1 of the engraved pattern 11 (P2? P1). The ratio P1 / P2 of the maximum width P1 of the engraved pattern 11 to the width P2 of the first flat portion 15 may be 1.0 or less, specifically 0.5 to 1.0. The width P2 of the first flat portion 15 may be 10 占 퐉 or less, specifically 5 占 퐉 to 10 占 퐉. In the above ratio and width range, there may be a light converging and diffusing effect. Fig. 1 shows an optical film having the same width P2 of the first flat portion 15, but an optical film having a different width of the first flat portion may be included in the present invention.

The refractive index of the high refractive index particles 16 may be higher than that of the high refractive index pattern layer 12. [ Therefore, the high refractive index pattern layer 12 has a high refractive index and secures a refractive index difference of at least 0.15 with respect to the low refractive index pattern layer 14, so that a resin having a low refractive index but a high adhesive strength can be used for the low refractive index pattern layer 14, The adhesion between the refractive index pattern layer 14 and the adherend can be improved. Specifically, the high refractive index particles 16 may have a refractive index of 1.6 to 3.0, specifically 2.0 to 3.0. The high refractive index particles 16 are not limited in shape, but can be spherical particles. The average particle diameter (D50) of the high refractive index particles 16 may be 10 nm to 20 nm. Within the above range, the object of the present invention can be achieved without reducing the diffusing and refracting effect of the visibility improving layer. The high refractive index particles 16 may be included in the high refractive index pattern layer 12 in an amount of 5 to 30% by weight, specifically 10 to 30% by weight. Within this range, it is easy to manufacture and the appearance can be good. The high refractive index particles 16 may comprise one or more of zirconia, titania. The high refractive index particles 16 may be a surface-treated form or a surface treated with a silane coupling agent or the like. The surface-treated high refractive index particles may be more compatible with the resin for forming the high refractive index pattern layer and better in adhesiveness.

The low refractive index pattern layer 14 can diffuse the light by refracting the light incident from the lower surface in various directions according to the incident position and emitting the light. Some of the incident light is emitted to the first flat portion 15 and provides a diffusion effect, thereby minimizing the luminance loss and enlarging the viewing angle by 1/2 up or down or right and left, thereby improving the visibility.

The low refractive index pattern layer 14 may be formed directly in contact with the high refractive index pattern layer 12. [ Means that no adhesive layer and / or an adhesive layer are interposed between the high refractive index pattern layer 12 and the low refractive index pattern layer 14 in this specification.

The low refractive index pattern layer 14 includes a surface facing the high refractive index pattern layer 12 and may include one or more filling patterns 13. The filling pattern 13 can fill at least a part of the engraved pattern 11. The "filling at least a part" includes both cases where the engraving pattern is completely filled or partially filled. When the filling pattern partially fills the engraved pattern, the remaining portion 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 pattern layer and the same or smaller than that of the high refractive index pattern layer. Referring to FIG. 3, the filler pattern 13 and the engraved pattern 11 are formed in an elongated stripe shape. Alternatively, the filler pattern and the relief pattern may be formed in a dot shape. The "dot" means that the combination of the filling pattern and the engraved pattern is dispersed.

The low refractive index pattern layer 14 may have a refractive index of less than 1.50, specifically 1.35 or more and less than 1.50. In the above range, the light diffusion effect is large, the production can be facilitated, and the visibility can be improved. The low refractive index pattern layer 14 may be formed of a transparent resin of ultraviolet curable resin having a refractive index lower than that of the resin of the high refractive index pattern layer 12. [ Specifically, the resin may include at least one of (meth) acrylic, polycarbonate, silicone, and epoxy resin, but is not limited thereto.

The base layer 20 is formed on the visibility improving layer 10A to protect the visibility improving layer 10A and to support the visibility improving layer 10A. The base layer 20 is a light-transmitting layer that transmits light diffused through the visibility improving layer 10A in the case of Fig. 1 in an optical display device, and transmits light through the visibility improving layer 10A in the case of Fig. 2 .

The base layer 20 and the visibility improving layer 10A may be directly in contact with each other and the base layer 20 and the visibility improving layer 10A may be integrated. The 'integrated' means that the base layer 20 and the visibility improving layer 10A are not separated from each other independently.

The substrate layer 20 may have a Re of at least 8,000 nm, specifically at least 10,000 nm, more specifically, at least 10,000 nm, more specifically, from 10,100 nm to 15,000 nm. In the above range, rainbow stains can be prevented from being visible, and the diffusion effect of light diffused through the visibility improving layer 10A can be made larger. 1 and 2 show a case where the base layer 20 contains a film having a Re of 8,000 nm or more. However, the base layer 20 is preferably made of a material having a Re of 60 nm or less, specifically 0 nm to 60 nm, more specifically 40 nm to 60 nm It may be an optical film. The viewing angle can be compensated in the above range to improve the image quality. The "isotropic optical film" means a film in which nx, ny, and nz are substantially the same, and the "substantially the same" includes not only completely identical cases but also cases including some errors.

The base layer 20 may have a thickness of 20 to 120 占 퐉, specifically 30 to 100 占 퐉. And can be used in an optical display device in the above range. The base layer 20 may have a light transmittance of 80% or more and specifically 85% to 95% in the visible light region.

The base layer 20 may be a film obtained by uniaxially or biaxially stretching an optical transparent resin. Specifically, the resin may be at least one selected from the group consisting of polyesters including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, acrylic, cyclic olefin polymer (COP), triacetyl cellulose Polyvinyl acetate, polyvinyl chloride (PVC), polynorbornene, polycarbonate (PC), polyamide, polyacetal, polyphenylene ether, polyphenylene sulfide, polysulfone, polyethersulfone , Polyarylate, and polyimide. The base layer 20 may comprise a 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.

Although not shown in FIGS. 1 and 2, the substrate layer 20 may include a base film and a primer layer formed on at least one side of the base film. The base film supports the base layer 20, and the transmittance of the base layer 20 can be increased by having a refractive index ratio within 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 base 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 the above range, it can be used as a base film of the base layer, and it is easy to control the refractive index with the primer layer, and the transmittance of the base layer can be increased. The base film may comprise a film formed from the above-mentioned resin. The primer layer is formed between the base film and the high refractive index pattern layer 12, so that adhesion between the base film and the high refractive index pattern layer 12 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 an optical film and has an appropriate refractive index with respect to a base film, so that the transmittance of the base 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 an optical film, has an appropriate refractive index with respect to a base film, can increase the transmittance of the base layer, and can eliminate brittle phenomenon. 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.

Further, although not shown in Figs. 1 and 2, an adhesive layer may be further formed on the optical film 1. Fig. For example, in FIG. 1, an adhesive layer may be formed on the low refractive index pattern layer 11, and an adhesive layer may be formed on the bottom of the substrate layer 20 in FIG. When the adhesive layer is formed as described above, the internal light may first enter the low refractive index pattern layer 14 in the display device and then be incident on the high refractive index pattern layer 12. The adhesive layer can adhere the optical film to an adherend, for example, a polarizer, a protective layer, or the like. The adhesive layer is optically transparent so that the incident light can be transmitted without being refracted. Therefore, the transparency of the optical film can be further increased. The adhesive layer may be formed of a conventional adhesive known to those skilled in the art. For example, the adhesive layer may comprise a thermosetting adhesive or a photocurable adhesive. Specifically, the adhesive layer may include a (meth) acrylic resin, a cationic epoxy compound, a photoinitiator, a coupling agent, and the like.

The optical films (1) and (2) of this embodiment may have a surface hardness of H or more, specifically, H to 3H. Within the above range, polarizers and the like can be protected, and a hardness appropriate for the liquid crystal display device can be given.

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

4, the optical film 3 according to the present embodiment includes a high refractive index pattern layer 12b and a low refractive index pattern layer 14b, and the cross section of the engraved pattern 11b in the visibility improving layer 10B, Is substantially the same as the optical film 1 according to the embodiment of the present invention, except that it is a triangular prism pattern. Therefore, only the engraved pattern 11b will be described in detail.

The engraved pattern 11b may be a prism pattern having a maximum width P3 of 5 占 퐉 to 20 占 퐉, specifically, 7 占 퐉 to 15 占 퐉. The maximum height H2 of the engraved pattern 11b may be 3 占 퐉 to 16 占 퐉, specifically, 4 占 퐉 to 16 占 퐉. The engraved pattern 11b may be a prism pattern in which the apex angle α is 55 ° to 90 °, specifically 65 ° to 80 °. The engraved pattern 11b may have an aspect ratio of 1.0 or less, specifically 0.50 to 0.96, more specifically 0.6 to 0.78. In the range of width, height, apex angle and aspect ratio, there may be a light diffusion effect. Fig. 4 shows an optical film including an engraved pattern 11b having a triangular section, but may also include a prism pattern having an n-square section (n is an integer of 4 to 10) in cross section. Further, the concave-convex is further formed in the engraved pattern 11b of Fig. 4, so that the diffusion effect can be increased.

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

5, the optical film 4 according to the present embodiment includes a high refractive index pattern layer 12c and a low refractive index pattern layer 14c, and the first flat portion 15c of the visibility improvement layer 10C, Is substantially the same as the optical film 1 according to the embodiment of the present invention, except that a curved surface 17c is formed between the engraved pattern 11c and the engraved pattern 11c. The optical film according to the present embodiment can further enhance the condensing diffusion effect.

Hereinafter, an optical film according to still another embodiment of the present invention will be described with reference to FIG. 6 is a cross-sectional view of an optical film according to another embodiment of the present invention.

6, the optical film 5 according to the present embodiment includes a high refractive index pattern layer 12d and a low refractive index pattern layer 14d, and the engraved pattern 11d of the visibility improving layer 10D includes Is substantially the same as the optical film 3 according to another embodiment of the present invention, except that one second flat portion 18d is formed on the bottom surface. The second flat portion 18d is formed on the lowermost surface, so that the diffusion efficiency of the incident light can be increased and the luminance can be increased even at the same viewing angle. Therefore, the optical film 5 can improve the visibility by increasing the light diffusion effect, minimizing the luminance loss, and increasing the viewing angle of 1/2 up / down or left / right. The width P4 of the second flat portion 18d of the engraved pattern 11d may be smaller than the maximum width P3 of the engraved pattern 11d (P3 > P4). The ratio P3 / P4 of the width P4 of the second flat portion 18d of the engraved pattern 11d to the maximum width P3 of the engraved pattern 11d may be 1 or less, specifically 0.5 to 1 have. Within this range, there may be a light diffusion effect. The engraved pattern 11d may have a base angle beta of 70 deg. Or more and less than 90 deg., Specifically 75 deg. To 85 deg. In the above range, the luminance loss can be minimized, and 1/2 up / down or right / left viewing angles can be increased, thereby enhancing the visibility improvement effect. The "base angle" is defined to be less than 90 degrees formed between the slant face 19d of the engraved pattern 11d directly connected to the maximum width P3 of the engraved pattern 11d and the maximum width P3 of the engraved pattern 11d Respectively. FIG. 6 is a plan view of the second flat portion 18d formed on the lowermost side and the inclined surface 19d is formed in a trapezoidal shape in plan view (for example, cut-prism in which the lower portion of a prism having a triangular section is cut) Pattern 11d. However, in the engraved pattern, at least one second flat portion may be formed on the lowermost surface, or an engraved pattern (e.g., a cut-lenticular lens in which the lower surface of the lenticular lens pattern is cut) in which the inclined surface is a curved surface, And an engraved pattern in which the section formed with the addition is n-angular (n is an integer of 5 or more, specifically 5 to 10). The second flat portion 18d may be formed parallel to one surface of the base layer 20.

Hereinafter, an optical film according to still another embodiment of the present invention will be described with reference to FIG. 7 is a cross-sectional view of an optical film according to another embodiment of the present invention.

7, the optical film 6 according to the present embodiment includes a high refractive index pattern layer 12e and a low refractive index pattern layer 14e, and the engraved pattern 11e of the visibility improving layer 10E has a cross- Is substantially the same as the optical film 1 according to the embodiment of the present invention, except that the lower part of the triangular prism is cut. The light reaching the first flat portion 15e is totally reflected and emitted by the engraved pattern 11e, so that the condensed light can be diffused.

Hereinafter, an optical film according to another embodiment of the present invention will be described with reference to FIG. 8 is a cross-sectional view of an optical film according to another embodiment of the present invention. This embodiment is substantially the same as the optical film 2 according to an embodiment of the present invention, except that a functional layer is further formed. The functional layer may be formed on the base layer 20 in the structure as shown in Fig. 1, or on the high refractive index pattern layer 12f as shown in Fig. 8 in the structure shown in Fig.

The functional layer is formed on the substrate layer with anti-reflection, low reflection, hard coating, anti-glare, anti-finger, anti- , Diffusing, and refracting functions. In one embodiment, the functional layer is formed as a separate, independent layer on the substrate layer, and may be formed by applying a composition for forming a functional layer on the substrate layer, or may be laminated on the substrate layer through an adhesive layer or adhesive layer. In other embodiments, the functional layer may be formed such that one side of the substrate layer is the functional layer. 8, the optical film 7 is formed so that one surface of the visibility improvement layer 10F has the same function as the above-mentioned one, or the high refractive index pattern layer 12f is formed using fine particles or the like, May be formed to be a functional layer (30). Further, the functional layer may be formed as a separate layer that is independent on the high refractive index pattern layer.

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

Referring to Fig. 9, the polarizing plate 100 according to the present embodiment includes a polarizer 60 and an optical film, and the optical film may be an optical film according to the above-described embodiments of the present invention. The polarizing plate includes the optical film according to the embodiments of the present invention, thereby minimizing the luminance loss of the optical display device, widening the viewing angle by 1/2, left or right or up and down, and improving the visibility.

The polarizer 60 may polarize the incident light, and may include a conventional polarizer known to those skilled in the art. Specifically, the polarizer may include a polyvinyl alcohol polarizer produced by uniaxially stretching a polyvinyl alcohol film, or a polyene polarizer produced by dehydrating a polyvinyl alcohol film. The polarizer 60 may have a thickness of 5 占 퐉 to 40 占 퐉. In the above range, it can be used in an optical display device.

Fig. 9 shows a polarizing plate in which the optical film is the optical film of Fig. 1, but the optical film may be an optical film according to the embodiments of the present invention described above. 9 shows the case where the polarizer 60, the low refractive index pattern layer 14, the high refractive index pattern layer 12 and the substrate layer 20 are sequentially stacked in this order. However, And a polarizer, a base layer, a low refractive index pattern layer, and a high refractive index pattern layer laminated in this order. In this case, a functional layer is formed on the base layer or the high refractive index pattern layer located at the uppermost position in each structure, or one surface of the base layer or the high refractive index pattern layer is treated to function as a functional layer to form a functional layer You may.

Although not shown in Fig. 9, an adhesive layer may be further formed between the optical film and the polarizer 60. Fig. The adhesive layer is as described above. The adhesive layer may further include a conventional light diffusing agent known to those skilled in the art to enhance the light diffusing effect. Further, although not shown in Fig. 9, the base layer may be further laminated on the other surface of the polarizer 60. [

Hereinafter, a module for a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 10 is a schematic cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.

10, a module 1000 for a liquid crystal display according to an embodiment of the present invention includes a first polarizing plate 1200, a liquid crystal panel 1300, and a second polarizing plate 1400, and a second polarizing plate 1400 may comprise a polarizer according to embodiments of the present invention.

The first polarizing plate 1200 is formed under the liquid crystal panel 1300 and can polarize light incident from below. The first polarizing plate 1200 may include a polarizer and a base layer formed on at least one surface of the polarizer. The polarizer and substrate layer are as described above in the optical film. In an embodiment, the base layer is an isotropic optical film, and the Re may be 5 nm or less, specifically 0.1 nm to 5 nm. The base layer may have a Rth of 5 nm or less, specifically 0.1 nm to 5 nm at a wavelength of 550 nm. The contrast ratio in the normal direction and the oblique direction with respect to the liquid crystal panel can be increased in the Re and Rth ranges.

Although not shown in Fig. 10, the first polarizing plate 1200 can be adhered to the liquid crystal panel 1300 by an adhesive layer. The pressure-sensitive adhesive layer may be formed of a pressure-sensitive adhesive composition comprising a pressure-sensitive adhesive resin, a crosslinking agent, and optionally a silane coupling agent. The adhesive layer may further enhance the light diffusion effect by further including a light diffusing agent. The light diffusing agent may comprise conventional light diffusers known to those skilled in the art.

The liquid crystal panel 1300 is formed between the first polarizing plate 1200 and the second polarizing plate 1400 and can transmit the light incident from the first polarizing plate 1200 to the second polarizing plate 1400. The liquid crystal panel 1300 includes 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 may include a liquid crystal that is uniformly oriented when the electric field is not visible. Specifically, the liquid crystal panel 300 may employ a VA (vertical alignment) mode, a PVA (patterned vertical alignment) mode, or an S-PVA (super-patterned vertical alignment) mode.

The second polarizing plate 1400 is formed on the liquid crystal panel 1300 and can polarize and diffuse condensed light incident from the liquid crystal panel 1300. As a result, the second polarizing plate 1200 can increase the contrast ratio and luminance uniformity at the side, improve the viewing angle at the side, and minimize the difference in luminance uniformity according to the screen size of the liquid crystal display device.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 11 is a perspective view of a composite optical sheet of a module for a liquid crystal display according to another embodiment of the present invention.

A module for a liquid crystal display device according to another embodiment of the present invention may include a composite optical sheet, a first polarizer, a liquid crystal panel, and a second polarizer. Is substantially the same as the module for a liquid crystal display according to an embodiment of the present invention, except that a composite optical sheet is further included. The composite optical sheet is located below the first polarizing plate and can condense and emit light incident from below. Thus, only the composite optical sheet will be described.

11, the composite optical sheet 1100 according to the present embodiment includes a first optical sheet 1110 including one or more first prism patterns 1112 on one surface thereof, and a second optical sheet 1110 on the first optical sheet 1110 And a second optical sheet 1120 that is formed and includes at least one second prism pattern 1122 on one side.

The composite optical sheet 1100 can emit light at an emission angle of -40 ° to + 40 °, specifically -30 ° to + 30 °, more specifically, -28 ° to + 28 °. The light emitted from the side of the composite optical sheet to minimize the light passing through the liquid crystal panel, and the incidence light can be condensed and emitted to increase the contrast ratio of the side surface.

The first optical sheet 1110 may be positioned below the second optical sheet 1120. The first optical sheet 1110 has a light outgoing surface that is a top surface and a light incident surface that is a bottom surface, and can change the path of the incident light to be emitted to the second optical sheet 1120. The first optical sheet 1110 may include a first base film 1111 and at least one first prism pattern 1112 formed on the first base film 1111.

The first base film 1111 supports the first optical sheet 1110 and has a thickness of not more than 10 탆 to 500 탆, specifically, 25 탆 to 250 탆, more specifically, 75 탆 to 150 탆 . In the above range, it can be used in a liquid crystal display device. The first base film 1111 may be formed of a thermoplastic resin or a composition containing the thermoplastic resin. Specifically, the thermoplastic resin may be a polyester resin including a polyethylene terephthalate resin and a polyethylene naphthalate resin, a polyacetal resin, an acrylic resin, a polycarbonate resin, a styrene resin, a vinyl resin, a polyphenylene ether resin, Butadiene-styrene copolymer resin, polyacrylate resin, polyaryl sulfone resin, polyether sulfone resin, polyphenylene sulfide resin, polyphenylene sulfide resin, and polyphenylene sulfone resin. A feed resin, a fluorine resin, and a (meth) acrylic resin.

The first prism pattern 1112 is formed on the upper surface of the first optical sheet 1110, and light incident from the lower surface can be condensed to increase the brightness. 11 illustrates a prism pattern having a triangular cross section, but the present invention is not limited thereto. The cross section of the first prism pattern 1112 may be a prism having a polygon having 4 to 10 sides. The height H4 of the first prism pattern 1112 may be 5 占 퐉 to 50 占 퐉, specifically 5 占 퐉 to 40 占 퐉, and more specifically, 10 占 퐉 to 30 占 퐉. The first prism pattern 1112 may have an apex angle? Of 80 ° to 100 °, specifically, 85 ° to 95 °. In the range of the height and the apex angle, there may be a luminance improvement and a moiré suppressing effect. The first prism pattern 1112 may have an aspect ratio of 0.3 to 0.7, specifically 0.4 to 0.6. Within the above range, there may be a brightness enhancement effect. The first prism pattern 1112 may be formed of a composition including an ultraviolet curable unsaturated compound, an initiator, or the like, or may be formed of the same or different materials among the materials for the first base film 1111. As an example, the ultraviolet curable unsaturated compound may be at least one selected from the group consisting of epoxy (meth) acrylate, urethane (meth) acrylate, phenylphenol ethoxylated (meth) acrylate, trimethylolpropane ethoxylated (Meth) acrylate, phenoxybenzyl (meth) acrylate, phenylphenoxyethyl (meth) acrylate, ethoxylated thiodiphenyl di (meth) acrylate, phenylthioethyl But is not limited thereto. As the initiator, photoinitiators such as ketone, phosphine oxide and the like can be used, but the present invention is not limited thereto. The first prism pattern 1112 may be an extended form of a stripe shape, and the longitudinal direction thereof may be substantially the same as the vertical direction. The "substantially the same" includes cases where not only completely identical but also some errors are present.

The second optical sheet 1120 is formed on the upper surface of the first optical sheet 1110 and has a light incident surface that is a top surface and a light incident surface that is a bottom surface and changes the path of light incident from the first optical sheet 1110 . The second optical sheet 1120 may include a second base film 1121 and a second prism pattern 1122 formed on the second base film 1121.

The second base film 1121 supports the second optical sheet 1120 and has a thickness of not more than 10 탆 to 500 탆, specifically 25 탆 to 250 탆, more specifically, 75 탆 to 150 탆 . In the above range, it can be used in a liquid crystal display device. The second base film 1121 may be formed of the same or different resin as the first base film 1111. The thickness of the second base film 1121 may be the same as or different from that of the first base film 1111.

The second prism pattern 1122 is formed on the upper surface of the second optical sheet 1120, and light incident from the lower surface can be condensed to increase the brightness. 11 illustrates a second prism pattern 1122 having a triangular cross section, but the present invention is not limited thereto. The cross section of the second prism pattern 1122 may be a prism having a polygon having 4 to 10 sides. The second prism patterns 1122 may be formed of the same or different materials as the first prism patterns 1112. The height H5 of the second prism pattern 1122 may be 5 占 퐉 to 50 占 퐉, specifically 5 占 퐉 to 40 占 퐉, and more specifically, 10 占 퐉 to 30 占 퐉. The second prism pattern 1122 may have a vertex angle? Of 80 ° to 100 °, specifically, 85 ° to 95 °. In the range of the height and the apex angle, there may be a luminance improvement and a moiré suppressing effect. The second prism pattern 1122 may have an aspect ratio of 0.3 to 0.7, specifically 0.4 to 0.6. Within the above range, there may be a brightness enhancement effect. The ratio (A 2 / A 1 ) of the aspect ratio (A 2 ) of the second prism pattern to the aspect ratio (A 1 ) of the first prism pattern may be 0.9 to 1.1. In the above range, light can be emitted at an exit angle of -40 ° to + 40 ° to improve the side contrast ratio. The second prism pattern 1122 may be an elongated shape of a stripe shape, and the longitudinal direction thereof may be substantially perpendicular to the longitudinal direction of the first prism pattern 1112. The "substantially orthogonal" includes not only fully orthogonal but also some errors.

Although not shown in FIG. 11, a diffuser plate may be further included between the composite optical sheet 1100 and the first polarizing plate 1200. The diffusion plate protects the composite optical sheet 1100 and may include a diffusing agent.

11 shows a case where the second optical sheet 1120 and the first optical sheet 1110 are laminated without an adhesive layer interposed therebetween. However, a composite optical sheet in which an adhesive layer is formed on the lower surface of the first optical sheet 1110 and a second prism pattern 1122 of the second optical sheet 1120 penetrates the adhesive layer may also be included. The adhesive layer can prevent deformation of the first optical sheet and the second optical sheet to prevent sheet chipping and unevenness. The adhesive layer may be formed of an ordinary adhesive resin such as acrylic acid or methacrylic acid ester resin. The thickness of the adhesive layer may be 1 탆 to 10 탆, specifically 2 탆 to 8 탆. In the above range, a sufficient adhesive force can be secured.

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, in an embodiment of the present invention, the liquid crystal display 2000 includes a light source 2100, a light guide plate 2200 for guiding light emitted from the light source 2100, The liquid crystal display device module 2500 positioned above the diffusion sheet 2400 and the liquid crystal display module 2500 disposed on the upper side of the light guide plate 2200 And a module 2500 for a liquid crystal display device may include a module for a liquid crystal display device according to embodiments of the present invention.

The light source 2100 generates light and may be disposed on the side surface of the light guide plate 2200 (edge type). As the light source 2100, 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 2110 may be disposed outside the light source 2100.

The light guide plate 2200 guides the light generated from the light source 2100 to the diffusion sheet 2400. It can be omitted when adopting a direct-type light source.

The reflective sheet 2300 reflects the light generated from the light source 2100 and supplies the light toward the diffusion sheet 2400.

The diffusion sheet 2400 diffuses and scatters light incident through the light guide plate 2200 and supplies the light to the liquid crystal display device.

12 shows the liquid crystal display device in which the light source 10 is disposed on the side surface of the light guide plate 2200. The light source 2100 may be disposed on the lower surface of the light guide plate 2200 2200 may be omitted, and a diffusion plate may be further included.

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  One

100 parts by weight of an ultraviolet ray curable resin (SSC566, Shin-A & T Co., Ltd.) and 10 parts by weight of zirconia (refractive index: 2.1, average particle diameter: 10 nm) were mixed to prepare a composition for forming a high refractive index pattern layer.

The above composition for forming a high refractive index pattern layer was coated on one side of a transparent PET film for substrate layer (Toyobo, SRF, thickness: 80 탆, Re = 14,000 nm), and a pattern with a relief pattern and a first flat portion ) Were alternately formed on the coating layer to form a depressed pattern on the coating layer and cured to form a high refractive index pattern layer in which the engraved pattern and the first flat portion in the following Table 1 were formed. The high refractive index pattern layer was coated with an ultraviolet ray hardening resin (SSC420, Shin-A & T) to completely fill the depressed pattern and cured to produce an optical film having a low refractive index pattern layer formed directly on the high refractive index pattern layer.

Example  2 and Example  3

An optical film was prepared in the same manner as in Example 1, except that the zirconia content was changed as shown in Table 1 below.

Example  4

An optical film was produced in the same manner as in Example 3, except that an ultraviolet curing resin (SSC440, Shin-A & T) was used in place of the ultraviolet curable resin (SSC420, Shin-A & T).

Example  5

An optical film was produced in the same manner as in Example 1 except that titanium (refractive index: 2.5, average particle diameter: 10 nm) was used instead of zirconia in the high refractive index pattern layer.

Comparative Example  One

(SSC566, ShinA T & C) was coated on one side of a transparent PET film for substrate layer (Toyobo, SRF, thickness: 80 탆, Re = 14,000 nm), and a pattern with a relief pattern and a first flat portion ) Were alternately formed on the coating layer to form a depressed pattern on the coating layer and cured to form a high refractive index pattern layer in which the engraved pattern and the first flat portion in the following Table 1 were formed. The high refractive index pattern layer was coated with an ultraviolet ray hardening resin (SSC420, Shin-A & T) to completely fill the depressed pattern and cured to produce an optical film having a low refractive index pattern layer formed directly on the high refractive index pattern layer.

The physical properties of the optical films of the examples and comparative examples were evaluated in the following Table 1, and the results are shown in Table 1 below.

(1) Transmittance and haze: The transmittance and haze were measured at wavelengths of 400 nm to 800 nm using an NDH 300A (Nippon Denshoku) for an optical film (width x length, 100 mm x 100 mm).

(2) Appearance and Coatability: Whether or not the high refractive index pattern layer was uniformly coated on the optical film (width x length, 300 mm x 300 mm) was visually evaluated and evaluated as being good if uniformly coated or not Respectively.

(3) Surface Hardness: The optical film (width x length, 100 mm x 100 mm) is stuck so that the low refractive index pattern layer is in contact with the glass plate. A pencil corresponding to 6B to 9H specified in JIS K 5600 is shifted by at least 10 mm at a speed of 0.8 mm / sec with a force of 500 ± 25 g at an inclination of 45 ° with respect to the plane of the substrate layer. Move the pencil and after 30 seconds, scratch the surface to see if there is any scratches. The position is shifted and performed in the same way for 5 times. If there is no scratch on the surface of the base layer more than 2 times in the 5th experiment, change it to pencil of the upper hardness and conduct the same experiment. Find the pencil hardness when scratches occur more than once on the specimen, and set the hardness one step lower than the pencil to the surface hardness.

(4) Adhesion force: A total of 100 fragments were prepared by kneading 10 rows and 10 rows of the low refractive index pattern layer in the optical film (width x length, 100 mm x 100 mm). When a tape (NITTO yarn) is affixed to the low refractive index pattern layer and torn out, the number of the high refractive index pattern layers not detached is determined. The higher the number of unadsorbed particles, the higher the adhesion between the high refractive index pattern layer and the substrate layer.

Example Comparative Example
One One 2 3 4 5 The high refractive index pattern layer Engraved pattern Lenticular
lens Lenticular
lens Lenticular
lens Lenticular
lens Lenticular
lens Lenticular
lens Maximum width of engraving pattern
(탆) 10 10 10 10 10 10 Engraved pattern height
(탆) 10 10 10 10 10 10 Engraved pattern
Aspect ratio 1.0 1.0 1.0 1.0 1.0 1.0 High refractive index particles Zirconia Zirconia Zirconia Zirconia Titania - Particle content
(Parts by weight) 10 20 30 30 10 - Refractive index 1.597 1.607 1.614 1.614 1.603 1.590 The low refractive index pattern layer Refractive index 1.440 1.440 1.440 1.464 1.440 1.440 particle - - - - - - Particle content
(Parts by weight) - - - - - - Difference in refractive index * 0.157 0.167 0.174 0.150 0.163 0.150 Transmittance (%) 88.29 87.86 87.11 87.35 86.51 89.15 Haze (%) 1.75 2.59     3.01 2.47 3.80 0.90 Appearance and Coating Property Good Good Good Good Good Good Surface hardness H H 2H 2H H H Adhesion
(Number of unattached pieces / total number of pieces) 100/100 100/100 100/100 100/100 100/100 95/100

* Refractive index difference: Refractive index of high refractive index pattern layer - Refractive index of low refractive index pattern layer

As shown in Table 1, the refractive index of the high refractive index pattern layer can be improved by incorporating high refractive index particles into the high refractive index pattern layer. In addition, it was easy to form a high refractive index pattern layer because of good appearance and coating properties. In addition, the optical film to which the high refractive index particles were added according to the present example had excellent adhesion to the substrate layer. Further, in the case of Example 4, there is an advantage that a low-cost low-cost resin can be used. On the other hand, Comparative Example 1 in which high refractive index particles were not included in the high refractive index pattern layer had a problem in adhesion.

A polarizing plate and a module for a liquid crystal display were manufactured using the optical films of Examples and Comparative Examples.

Manufacturing example  One: Composite optical sheet  Produce

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 above 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 to the coating material using a pattern roll having a prism pattern (height: 12 占 퐉, width: 24 占 퐉, and apex angle: 90 占) and cured to form a first optical To form a 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. The outgoing angle was measured by the viewing angle measurement method for the composite optical sheet. The exit angle is -28 °, + 28 °.

Manufacturing example  2: Production of first polarizing plate

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

Manufacturing example  3: Fabrication of module for liquid crystal display device

( 1) the second polarizer plate  Produce

Polarizers were prepared in the same manner as in Production Example 2.

An adhesive for polarizing plate (Z-200, manufactured by Nippon Goshei) was coated on one surface of the low refractive index pattern layer of the optical films of Examples and Comparative Examples, followed by laminating with the polarizer and curing to prepare a second polarizing plate.

( 2) For liquid crystal display  Manufacture of modules

The composite optical sheet of Production Example 1, the first polarizing plate of Production Example 2, the liquid crystal panel (PVA mode), and the second polarizing plate thus prepared were assembled successively to prepare a module for a liquid crystal display device.

Table 2 shows the schematic structure of the module for a liquid crystal display device manufactured in Examples and Comparative Examples. The following properties were evaluated using the liquid crystal display module manufactured in Examples and Comparative Examples, and the results are shown in Table 2 below.

(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 EZ CONTRAST 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 right and left viewing angles and 1/2 upper and lower viewing angles: A liquid crystal display was manufactured in the same manner as in (1), and the luminance value was measured using EZ CONTRAST X88RC (EZXL-176R-F422A4, ELDIM) . The 1/2 right and left viewing angles and the upper and lower viewing angles respectively indicate viewing angles having a luminance of 1/2 of the front luminance.

Example Comparative Example
One One 2 3 4 5 Relative luminance (%) 98 96 95 97 93 100 1/2 Right and left viewing angle (°) 66 69 71 68 68 63 1/2 up and down
Viewing angle (°) 49 51 53 51 50 46

As shown in Table 2, the module for a liquid crystal display according to the present embodiment improves the lateral viewing angle while minimizing the relative luminance reduction. On the other hand, Comparative Example 1, which does not contain high refractive index particles in the high refractive index pattern layer, had poor viewing angles.

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 (17)

A base layer and a visible improvement layer formed on the base layer,
Wherein the visibility improving layer includes a low refractive index pattern layer including a high refractive index pattern layer having at least one engraved pattern formed thereon and a filling pattern filling at least a part of the engraved pattern,
The visibility improving layer having a structure in which the base layer, the high refractive index pattern layer and the low refractive index pattern layer are sequentially laminated is formed,
The refractive index of the high refractive index pattern layer is larger than the refractive index of the low refractive index pattern layer,
Wherein the high refractive index pattern layer comprises high refractive index particles having a refractive index larger than that of the high refractive index pattern layer in an amount of 10 to 30 wt%
Wherein the high refractive index particles comprise zirconia,
A first flat portion is further formed between the engraved pattern and the adjacent engraved pattern,
The ratio P1 / P2 of the maximum width P1 of the engraved pattern to the width P2 of the first flat portion is 0.5 to 1.0. delete delete The optical film for improving the visibility of display according to claim 1, wherein a refractive index difference between the high refractive index pattern layer and the low refractive index pattern layer is 0.10 to 0.20. The optical film for improving the visibility of display according to claim 1, wherein the high refractive index pattern layer has a refractive index of 1.50 or more. The optical film for improving the visibility of display according to claim 1, wherein the low refractive index pattern layer has a refractive index of less than 1.50. The prism pattern according to claim 1, wherein the engraved pattern is a lenticular lens pattern, a prism pattern having a triangular-to-octagonal cross section, a prism pattern having a curved bottom surface and a triangular- Wherein the lenticular lens pattern comprises a cut shape, a shape in which a lower portion of the lenticular lens pattern is cut off, or an engraved pattern in which at least one flat portion is formed at a lower portion and the cross section is an n-angular shape (n is an integer of 5 to 10) film. delete The optical film for improving the visibility of display according to claim 1, wherein the engraved pattern has an aspect ratio of 1.0 or less. The optical film for improving the visibility of display according to claim 1, wherein the base layer has an Re of the following formula A of 8,000 nm or more:
<Formula A>
Re = (nx - ny) xd
(In the above formula A, nx and ny are the refractive indexes in the slow axis direction and the thickness direction of the substrate layer at a wavelength of 550 nm, and d is the thickness (unit: nm) of the substrate layer). The optical film of claim 1, wherein the optical film further comprises a functional layer,
Wherein the functional layer is formed on the base layer. The method according to claim 1,
The refractive index difference between the high refractive index pattern layer and the low refractive index pattern layer is 0.10 to 0.20,
The base layer is formed directly in contact with the high refractive index pattern layer,
Wherein the substrate layer has an Re of the following formula A of 8,000 nm or more: an optical film for improving display visibility;
<Formula A>
Re = (nx - ny) xd
(In the above formula A, nx and ny are the refractive indexes in the slow axis direction and the thickness direction of the substrate layer at a wavelength of 550 nm, and d is the thickness (unit: nm) of the substrate layer). The optical film for improving the visibility of display according to claim 1, wherein the optical film has a surface hardness of not less than H according to JIS K 5600. A polarizer, and an optical film formed on the polarizer,
Wherein the optical film is an optical film for improving the visibility of display according to any one of claims 1, 4 to 7, and 9 to 13. The first polarizer plate,
The second polarizer plate,
A liquid crystal panel disposed between the first polarizer and the second polarizer,
And a composite optical sheet positioned below the first polarizer plate,
Wherein the second polarizer comprises a polarizer and an optical film formed on the polarizer,
Wherein the optical film comprises the optical film for improving the display visibility according to any one of claims 1 to 7, and 9 to 13,
Wherein the optical film is arranged such that light emitted from the composite optical sheet enters the low refractive index pattern layer and is emitted to the high refractive index pattern layer. The module for a liquid crystal display device according to claim 15, wherein the composite optical sheet has an exit angle of -40 ° to + 40 °. A liquid crystal display device comprising the liquid crystal display module according to claim 15.
KR1020150160740A 2015-11-16 2015-11-16 Optical film for improving visibility of display, polarizing plate comprising the same, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same KR101871552B1 (en)

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