KR20170091453A - Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same - Google Patents

Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same Download PDF

Info

Publication number
KR20170091453A
KR20170091453A KR1020160012495A KR20160012495A KR20170091453A KR 20170091453 A KR20170091453 A KR 20170091453A KR 1020160012495 A KR1020160012495 A KR 1020160012495A KR 20160012495 A KR20160012495 A KR 20160012495A KR 20170091453 A KR20170091453 A KR 20170091453A
Authority
KR
South Korea
Prior art keywords
layer
refractive index
pattern
polarizer
protective layer
Prior art date
Application number
KR1020160012495A
Other languages
Korean (ko)
Other versions
KR101802628B1 (en
Inventor
오영
주영현
이정호
Original Assignee
삼성에스디아이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Priority to KR1020160012495A priority Critical patent/KR101802628B1/en
Publication of KR20170091453A publication Critical patent/KR20170091453A/en
Application granted granted Critical
Publication of KR101802628B1 publication Critical patent/KR101802628B1/en

Links

Images

Classifications

    • 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
    • G02B5/305—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 including organic materials, e.g. polymeric layers
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

A polarizer, a first protective layer formed on one side of the polarizer, a visibility improving layer formed on the first protective layer, and a second protective layer formed on the visibility improving layer, Wherein the refractive index of the high refractive index pattern layer is larger than the refractive index of the low refractive index pattern layer and the refractive index of the high refractive index layer is larger than the refractive index of the low refractive index pattern layer, The pattern is a shape in which a top portion of a prism having a triangular section is cut off or a top portion of a lenticular lens pattern is cut out, a flat portion is formed between the engraved pattern and the adjacent engraved pattern, and the first protective layer or the second The protective layer may be formed of one or more of polyethylene terephthalate, triacetyl cellulose, cycloolefin polymer, Film, a liquid crystal display module including the composite polarizer, and a liquid crystal display including the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite polarizing plate, a module for a liquid crystal display including the same, and a liquid crystal display device including the composite polarizing plate.

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

The liquid crystal display device is operated by emitting light from the backlight unit through the liquid crystal panel and the polarizing plate. The side of the screen of the liquid crystal display device has a poor color contrast and contrast ratio compared to the front. There is an attempt to improve the visibility by modifying the liquid crystal panel or the liquid crystal to increase the color and contrast ratio on the side. The polarizer includes a polarizer. Polarizers are produced by dyeing and stretching or dehydrating polyvinyl alcohol films, so that the degree of polarization of the polarizer is lowered due to the sublimation of iodine and / or the shrinkage of the polarizer during leaving at a high temperature and / or a high humidity, and the reliability becomes poor.

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 composite polarizer capable of improving reliability of polarization degree, widening a side view angle, and improving visibility and side contrast ratio even after being left at high temperature and / or high humidity.

The polarizing plate of the present invention comprises a polarizer, a first protective layer formed on one side of the polarizer, a visibility improving layer formed on the first protective layer, and a second protective layer formed on the visibility improving layer, Layer includes a low refractive index pattern layer including a high refractive index pattern layer in which at least one engraved pattern is formed and a filling pattern filling at least a part of the engraved pattern, wherein the refractive index of the high refractive index pattern layer is a refractive index of the low refractive index pattern layer Wherein the engraved pattern is a shape in which a top portion of a prism having a triangular section is cut or a top portion of a lenticular lens pattern is cut, a flat portion is formed between the engraved pattern and the adjacent engraved pattern, Layer or the second protective layer is made of polyethylene terephthalate, triacetyl cellulose, cycloolefin polymer or acrylic resin. Or more.

The module for a liquid crystal display of the present invention comprises a first polarizing plate, a second polarizing plate, a liquid crystal panel disposed between the first polarizing plate and the second polarizing plate, and a composite optical sheet positioned under the first polarizing plate, The second polarizing plate may include a composite polarizing plate of the present invention, and the composite polarizing plate may be 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 liquid crystal display device of the present invention may include the liquid crystal display device module.

The present invention provides a composite polarizing plate having good reliability of polarization degree, widening a side view angle, and improving visibility and side contrast ratio even after being left at high temperature and / or high humidity.

1 is a cross-sectional view of a composite polarizer according to an embodiment of the present invention.
2 is an exploded perspective view of the visibility improving layer of Fig.
3 is a cross-sectional view of a composite polarizing plate according to another embodiment of the present invention.
4 is a cross-sectional view of a composite polarizer according to another embodiment of the present invention.
5 is a schematic cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.
6 is a perspective view of a composite optical sheet in a module for a liquid crystal display according to another embodiment of the present invention.
7 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.
8 is a conceptual diagram of an angle of incidence.
Fig. 9 is a graph of the polarization degree with time of leaving the polarizing plate at 60 DEG C and 95% relative humidity.

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 ", or "directly contacting"

In the present specification, the terms "horizontal direction" and "vertical direction" mean the longitudinal direction and the unidirectional 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.).

In the present specification, the term "outgoing angle" means a light outgoing angle, and when the luminance is measured in a liquid crystal display device incorporating a light source, a light guide plate, and a module for a liquid crystal display device, , The left side is referred to as -direction, the right side is referred to as + direction, the left end point is referred to as -90 °, and the right end point is referred to as + 90 °, luminance is measured at -90 ° to + 90 °, (Refer to Fig. 8). [0052] As shown in Fig. In Fig. 8, an emission angle is indicated by *. Fig. 8 shows a case where the outgoing angle is -30 ° and + 30 °.

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). As used herein, the term "period" means the sum of the maximum width of the engraved pattern of one of the visibility improvement layers and the width of one second flat portion. In the present specification, the "plane retardation (Re)" is represented by the following formula A:

<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 fast axis direction of the optical element at a wavelength of 550 nm, respectively, and d is the thickness (unit: nm) of the optical element concerned).

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. As used herein, the "adhesive layer" may mean both an adhesive layer, an adhesive layer, or a laminating layer.

Hereinafter, a composite 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 composite polarizer according to an embodiment of the present invention. 2 is an exploded perspective view of the visibility improving layer of Fig.

1, the complex polarizer 100 according to the present embodiment includes a polarizer 110, a first protective layer 120, an adhesive layer 130, a visibility improving layer 140, and a second protective layer 150 ). The complex polarizing plate 100 according to the present embodiment includes a polarizer 110, a first protective layer 120, an adhesive layer 130, a visibility improving layer 140, and a second protective layer 150 Structure. The composite polarizing plate 100 of the present embodiment not only improves visibility but also maintains light transmittance at a high temperature and / or high humidity while minimizing a decrease in polarization degree, thereby improving reliability. Specifically, the composite polarizing plate 100 of the present embodiment can have a rate of change in polarization degree of the following formula (1) of not more than 5%, specifically not more than 1%, more specifically not more than 0.1%, or not more than 0.01%

<Formula 1>

Polarization degree change rate = | P 500 - P 0 | / P 0 x 100

(In the formula 1, P 0 is the initial polarization of the complex polarizer (unit:%), P 500 is polarized after the composite polarizing plate was allowed to stand for 500 hours at 60 ℃ and 95% relative humidity (unit:%)). P 0 and P 500 may be at least 90%, at least 95%, and P 0 ≥ P 500 , respectively. The light transmittance of the complex polarizer 100 of the present embodiment may be 90% or more and 95% or more.

The polarizer 110 can polarize the incident light in the optical display device. The polarizer 110 is made by dewatering a polyvinyl alcohol polarizer or a polyvinyl alcohol film produced by dyeing and uniaxially stretching or uniaxially stretching and dyeing a conventional polarizer known to those skilled in the art, specifically, a polyvinyl alcohol film Or a liquid crystal polarizer. The polarizer 110 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.

The first protective layer 120 may be formed on one side of the polarizer 110 to protect and support the polarizer 110 and to transmit the light that has passed through the polarizer 110. In addition, the first protective layer 120 can prevent the lowering of the polarization degree during the standing at high temperature and / or high humidity, thereby improving the reliability. The first protective layer 120 will be described in more detail in the second protective layer 150 below.

The adhesive layer 130 may be formed on the first passivation layer 120 to adhere and / or adhere the first passivation layer 120 to the visibility improving layer 140 described below. The adhesive layer 130 may be formed of a conventional adhesive layer composition or a photocurable adhesive, a water-based adhesive, or a pressure-sensitive adhesive including a (meth) acrylic adhesive resin, a curing agent and the like. The thickness of the adhesive layer 130 may be 5 占 퐉 to 30 占 퐉. In the above range, the first protective layer 120 and the visibility improving layer 140 can be stably stuck to each other, and can be used in an optical display device. 1 illustrates the case where the adhesive layer 130 is included, but the adhesive layer may be omitted in some cases.

The visibility improving layer 140 is formed on the first protective layer 120 and the adhesive layer 130 to diffuse the polarized light having passed through the polarizer 110 to increase the diffusion effect even at the same viewing angle, The visibility can be improved by minimizing the loss and widening the 1/2 viewing angle or the 1/3 viewing angle.

The visibility improving layer 140 may have a thickness t of 10 占 퐉 to 45 占 퐉, specifically, 20 占 퐉 to 45 占 퐉. In this range, it is sufficiently supported by the first protective layer and can be used in an optical display device. The visibility improvement layer 140 includes a high refractive index pattern layer 142 formed with at least one engraved pattern 142a and a low refractive index pattern layer 141 including a filled pattern 141a filling at least a portion of the engraved pattern 142a. . &Lt; / RTI &gt;

The high refractive index pattern layer 142 can diffuse the condensed light by diffusing the light that has reached the low refractive index pattern layer 141 through the polarizer 110 in the optical display device. The refractive index of the high refractive index pattern layer 142 may be higher than that of the low refractive index pattern layer 141. [ Specifically, the refractive index difference between the high refractive index pattern layer 142 and the low refractive index pattern layer 141 may be 0.20 or less, specifically 0.15 or less, more specifically 0.10 to 0.15. Within this range, the effect of improving the diffusion of the light and improving the visibility may be large. The refractive index of the high refractive index pattern layer 142 may be 1.50 or more, specifically 1.50 to 1.60. Within this range, the light diffusion effect can be excellent. The high refractive index pattern layer 142 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.

1 and 2, the engraved pattern 142a has a shape in which a top portion of a prism having a triangular cross-section is formed in a shape in which a first flat portion 142b is formed at a top portion and a sloped surface 142d is a plane Which may be an intaglio optical pattern, such as a cut-prism. The first flat portion 142b is formed at the top portion, and the light reaching the low refractive index pattern layer 141 in the optical display device is diffused more by the plane, thereby increasing the viewing angle and brightness. The height h of the engraved pattern 142a may be 30 占 퐉 or less, specifically 20 占 퐉 or less, more specifically, 5 占 퐉 to 15 占 퐉. In the above range, it is possible to improve the visibility, improve the viewing angle, and improve the brightness, and moire and the like may not appear. The engraved pattern 142a may have an aspect ratio of 1.5 or less, 1.0 or less, specifically 0.4 to 1.5, more specifically 0.4 to 1.0, more specifically 0.4 to 0.7. In the above range, it is possible to improve the contrast ratio and the viewing angle at the side in the optical display device. The engraved pattern 142a may have a base angle? Of 70 ° or more and less than 90 °, specifically, 80 ° or more and less than 90 °. The base angle θ means an angle less than 90 ° of the angle formed by the inclined face 142d of the engraved pattern 142a directly connected to the low refractive index pattern layer 141 and the maximum width b of the engraved pattern 142a. In the above range, the luminance loss can be minimized, and the 1/2 viewing angle and the 1/3 viewing angle can be increased, so that the visibility improvement effect can be larger. The width a of the first flat portion 142b may be smaller than the maximum width b of the engraved pattern 142a so that b > a. In the above range, the base line range is satisfied, the luminance loss is minimized, and the 1/2 viewing angle and the 1/3 viewing angle are increased, so that the visibility improving effect can be larger. The sum of the maximum widths (b) of the engraved pattern 142a may be 40% to 60%, specifically 45% to 55% of the entire width of the high refractive index pattern layer 142. 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. Fig. 1 shows a visibility improvement layer in which three engraved patterns 142a having the same aspect ratio, the same maximum width, and the same height are formed. However, an engraved pattern having different aspect ratios, maximum widths, or heights may be formed in the visibility improvement layer.

1 and 2, a second flat portion 142c may be included between the engraved pattern 142a and the adjacent engraved pattern 142a. The light reaching the second flat portion 142c can be diffused in the second flat portion 142c by being totally reflected and emitted from the engraved pattern. The width c of the second flat portion 142c may be equal to or greater than the maximum width b of the engraved pattern 142a and may be c≥b to improve the brightness and prevent moiré. Therefore, when the sum of one maximum width b of the engraved pattern 142a and one width c of the second flat portion 142c is a period p, the engraved pattern 142a (B / p) of the maximum width (b) Within this range, brightness, viewing angle, and visual acuity are good, and moire may not occur. The width c of the second flat portion 142c may have a relationship of 0.5 x c? H? 1.5 x c, specifically 0.7 x c? H? 1.5 x c, with respect to the height h of the engraved pattern 142a. Within the above range, there may be an effect of improving luminance and improving visibility. The period (p) may be 10 [mu] m to 30 [mu] m. Moire can be prevented while enhancing brightness and improving visibility within the above range.

The low refractive index pattern layer 141 can diffuse the light by refracting the light incident from the polarizer 110 in the optical display device in various directions according to the incident position and emitting it. The low refractive index pattern layer 141 includes a surface facing the high refractive index pattern layer 142 and may include one or more filling patterns 141a. The filling pattern 141a can fill at least a part of the engraved pattern 142a of the high refractive index pattern layer 142. [ The "filling at least a part" includes both cases where the engraving pattern is completely filled or partially filled. Referring to FIG. 2, the visibility improvement layer is shown in which the filling pattern 141a and the engraved pattern 142a are formed in a stripe-like elongated shape. However, the filling pattern and the engraved pattern are formed in the form of a dot . The "dot" means that the combination of the filling pattern and the engraved pattern is dispersed. The refractive index of the low refractive index pattern layer 141 may be 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 light diffusion and visibility improvement effect of polarized light can be great. The low refractive index pattern layer 141 can be formed of at least one of ultraviolet curable transparent resin, specifically (meth) acrylic, polycarbonate, silicone, and epoxy resin, but is not limited thereto. 1 illustrates a case where a low refractive index pattern layer and a high refractive index pattern layer are directly in contact with each other, but the present invention is not limited thereto.

Although not shown in Figs. 1 and 2, at least one of the high refractive index pattern layer 142 and the low refractive index pattern layer 141 may further include a light diffusing agent. The light diffusing agent can further enhance the diffusion effect of the visibility improving layer. The light diffusing agent may comprise one or more of the conventional organic, inorganic, organic-inorganic hybrid light diffusers known to those skilled in the art.

The second passivation layer 150 is formed on the visibility improving layer 140 to protect and support the visibility improving layer 140 and to transmit the light passing through the visibility improving layer 140.

The second passivation layer 150 may be integrated with the high refractive index pattern layer 142. The 'integrated' means that the second passivation layer 150 and the high refractive index pattern layer 142 are not separated from each other independently. The second passivation layer 150 may be formed directly in contact with the high refractive index pattern layer 142.

The first protective layer 120 or the second protective layer 150 may be a phase difference film or an isotropic film having a predetermined retardation independently of each other. In one embodiment, the first protective layer and the second protective layer may independently have Re greater than or equal to 8,000 nm, specifically greater than or equal to 10,000 nm, more specifically greater than or equal to 10,000 nm, and more specifically, less than or equal to 10,100 nm and less than or equal to 15,000 nm . In this range, rainbow stains can be prevented from being visible, and the diffusion effect of light diffused through the visibility improving layer 140 can be made larger. In another embodiment, the first protective layer or the second protective layer may have a Re of 60 nm or less, specifically 0 nm to 60 nm, more specifically, 40 nm to 60 nm. The viewing angle can be compensated in the above range to improve the image quality. In another embodiment, the first protective layer or the second protective layer may be an isotropic optical film. The "isotropic optical film" means films having substantially the same nx, ny, and nz, and the "substantially the same" The first protective layer 120 or the second protective layer 150 may have a thickness of 30 μm to 120 μm, specifically, 55 μm to 105 μm independently of each other. And can be used in an optical display device in the above range. The first protective layer 120 or the second protective layer 150 may have a light transmittance of 80% or more, specifically 85% to 95%, in the visible light region, independently of each other. The first passivation layer 120 or the second passivation layer 150 may include a uniaxially or biaxially stretched film or a non-stretched film of an optical transparent resin. Specifically, the resin may include at least one of a polyester including polyethylene terephthalate (PET) and the like, a cellulose ester including triacetyl cellulose (TAC), a cycloolefin polymer (COP), and acrylic.

Although not shown in FIG. 1, the first passivation layer 120 or the second passivation layer 150 may each include a functional layer. The functional layer may be formed on the first protective layer 120 or the second protective layer 150 by an anti-reflection, a low reflection, a hard coating, an anti-glare, It can provide one or more of anti-finger, anti-contamination, diffusion and refraction functions. The functional layer may be formed as an independent separate layer on the first passivation layer 120 or the second passivation layer 150, or one surface of the first passivation layer 120 or the second passivation layer 150 may be formed as a functional layer .

1, the first protective layer 120 or the second protective layer 150 may independently include a base film and a primer layer formed on at least one side of the base film. The base film supports the protective layer, and by having a refractive index ratio in a predetermined range with respect to the primer layer, the light transmittance of the protective layer can be increased. 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. Within the above range, the light transmittance of the 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 a base film of the protective layer, and it is easy to control the refractive index with the primer layer, and the light transmittance of the protective 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 142 and between the base film and the polarizer 110 to enhance adhesion between the base film and the high refractive index pattern layer 142 and between the base film and the polarizer 110 . 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 with respect to a base film, so that the light transmittance of the 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 light transmittance of the protective layer can be increased, and brittle phenomenon can be eliminated. The primer layer may be formed of a composition for a primer layer containing a urethane-based non-urethane-based primer layer, specifically, a resin such as polyester, acryl, or a monomer. 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.

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

3, the composite polarizer 200 according to the present embodiment is substantially the same as the composite polarizer 100 according to an embodiment of the present invention except that a third protective layer 160 is further formed . Thus, only the third protective layer 160 will be described.

The third protective layer 160 is formed on the other surface of the polarizer 110 to support and protect the polarizer 110 and to transmit the incident light to the polarizer 110. The third protective layer 160 is a film formed of an optically transparent resin. The third protective layer 160 is a film formed of at least one of polyester ester including polyethylene terephthalate and the like, cellulose ester including triacetyl cellulose, cycloolefin polymer, . The third passivation layer 160 may have the same or different thickness as the first passivation layer 120 or the second passivation layer 150 and may have the same or different retardation. Although not shown in FIG. 3, the third protective layer 160 may be laminated to the polarizer 110 by an adhesive layer. The adhesive layer is as described above.

Hereinafter, a composite 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 composite polarizer according to another embodiment of the present invention.

4, the complex polarizing plate 300 according to the present embodiment is configured such that the inclined surface 142d 'of the depressed pattern 142a' of the visibility improving layer 140 'is a depressed pattern (for example, a top of the lenticular lens pattern 142a' Is substantially the same as the composite polarizing plate 100 according to an embodiment of the present invention, except that it includes an engraved pattern that is a cut-lenticular lens. Since the engraved pattern 142a 'includes a curved surface, there is an effect that the luminance does not change abruptly according to the viewing angle. The base angle? Of the engraved pattern 142a 'is defined as an angle less than 90 占 between the tangent I of the most convex portion of the curved surface and the maximum width of the low refractive index pattern layer or an extension thereof, 70 DEG or more and less than 90 DEG, specifically, 80 DEG or more and less than 90 DEG.

Hereinafter, a module for a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 5 is a schematic cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.

5, the module 1000 for a liquid crystal display according to an embodiment of the present invention includes a first polarizing plate 1100, a liquid crystal panel 1200, and a second polarizing plate 1300, and the second polarizing plate 1300 may comprise a composite polarizer according to embodiments of the present invention.

The first polarizing plate 1100 can transmit the polarized light to the liquid crystal panel 1200. The first polarizing plate 1100 may include a polarizer and a protective layer. The polarizer and protective layer are as described above in the complex polarizing plate according to the embodiments of the present invention.

The liquid crystal panel 1200 is formed between the first polarizing plate 1100 and the second polarizing plate 1300 and can transmit the light incident from the first polarizing plate 1100 to the second polarizing plate 1300. The liquid crystal panel 1200 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 1300 is formed on the liquid crystal panel 1200 and can polarize and diffuse the condensed light incident from the liquid crystal panel 1200. As a result, the second polarizing plate 1300 improves the viewing angle by the contrast ratio and the luminance uniformity at the side, and improves the reliability.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 6 is a perspective view of a composite optical sheet in a module for a liquid crystal display according to another embodiment of the present invention. The module for a liquid crystal display of this embodiment is substantially the same as the module for a liquid crystal display of the embodiment of the present invention, except that a composite optical sheet is further provided below the first polarizing plate.

6, the composite optical sheet 1400 according to the present embodiment includes a first optical sheet 1410 including at least one first prism pattern 1412 on one side thereof, and a second optical sheet 1410 on the first optical sheet 1410 And a second optical sheet 1420 that is formed and includes at least one second prism pattern 1422 on one side.

The composite optical sheet 1400 can emit light at an exit angle of -40 ° to + 40 °, specifically -30 ° to + 30 °, more specifically, -28 ° to + 28 °. In the above range, the light emitted from the side of the composite optical sheet and passing through the liquid crystal panel is minimized, and the incident light is condensed and emitted to increase the contrast ratio of the side surface. The exit angle can be controlled by controlling the first prism pattern, the second prism pattern end face, the aspect ratio, and the like.

The first optical sheet 1410 may include a first base film 1411 and at least one first prism pattern 1412 formed on the first base film 1411. The first base film 1411 supports the first optical sheet 1410 and is not limited in thickness, but may be 10 占 퐉 to 500 占 퐉, specifically, 25 占 퐉 to 250 占 퐉. In the above range, it can be used in a liquid crystal display device. The first base film 1411 may be formed of an optically transparent thermoplastic resin or a composition including the first base film 1411. The first prism pattern 1412 may condense light incident from the lower surface and increase the brightness. 6 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 1412 may be a prism having a polygon having 4 to 10 sides. The first prism pattern 1412 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 1412 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 1411.

The second optical sheet 1420 may be formed on the first optical sheet 1410 and may include a second prism pattern 1422 formed on the second base film 1421 and the second base film 1421 have. The second base film 1421 supports the second optical sheet 1420 and can be the same as or different from the first base film 1411.

The second prism pattern 1422 is formed on the upper surface of the second optical sheet 1420, and light incident from the lower surface can be condensed to increase the brightness. The second prism pattern 1422 may be the same or different from the first prism pattern 1412.

6 shows a case where the second optical sheet 1410 and the first optical sheet 1420 are laminated without the adhesive layer interposed therebetween. However, a composite optical sheet in which an adhesive layer is formed on the lower surface of the second optical sheet 1420 and the first prism pattern 1412 of the first optical sheet 1410 penetrates the adhesive layer can also be included.

A diffusion plate may be further included between the composite optical sheet 1400 and the first polarizing plate 1100. The diffusion plate protects the composite optical sheet 1400 and may include a diffusing agent.

Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 7 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.

7, the liquid crystal display device 2000 includes a light source 2100, a light guide plate 2200 for guiding light emitted from the light source 2100, and a light guide plate 2200 disposed under the light guide plate 2200 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.

7 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, a method of manufacturing a composite polarizing plate according to embodiments of the present invention will be described.

A method of manufacturing a complex polarizing plate according to an exemplary embodiment of the present invention includes a first protective layer 120, a polarizer 110, and a second protective layer 120. The second protective layer 150 and the visibility improving layer 140 are sequentially formed. And a step of laminating the polarizing plate in which the third protective layer 160 is sequentially formed to the adhesive layer 130. A method of manufacturing a complex polarizing plate according to another embodiment of the present invention includes the steps of forming a first protective layer 120 as an adhesive layer 130 on a visibility improving film in which a second protective layer 150 and a visibility improving layer 140 are sequentially formed, And laminating a polarizing plate having a third protective layer 160 on one side of the polarizer 110 as an adhesive layer on the other side of the first protective layer 120. [

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

(SSC-5660, Shin-A & T Corp.) was coated on one side of a transparent PET film (Toyobo, thickness: 80 μm, Re = 14,000 nm) and a positive- And cured to form a high refractive index pattern layer having the engraved patterns shown in Table 1 below. An ultraviolet curable resin (SSC-4460, Shin-A & T Co., Ltd.) was coated on the high refractive index pattern layer to produce a visibility improvement film having a low refractive index pattern layer having a filling pattern completely filling the depressed pattern.

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.

(Z-200, manufactured by Nippon Goshei) was coated on both sides of the polarizer, and a transparent PET film (Toyobo, thickness: 80 mu m, Re = 14,000 nm) and a TAC film (Fuji, ZRD40SL) were laminated to prepare a polarizing plate.

(Soken, CI-205) was coated on one surface of the low refractive index pattern layer of the visibility improving film and a polarizing plate was laminated to form a composite polarizer plate in which a TAC film, a polarizer, a transparent PET film, .

Example  2

A composite polarizing plate was prepared in the same manner as in Example 1, except that the visibility improving layer was formed as shown in Table 1 below.

Comparative Example  One

A visibility improving film and a polarizer were produced in the same manner as in Example 1. [ (Z-200, Nippon Goshei) was coated on both sides of the polarizer, and a TAC film (Fuji, thickness: 80 mu m, ZRD40SL) was laminated and cured on the other side of the other side to obtain a TAC film , A polarizer, a visibility improving layer, and a transparent PET film were sequentially laminated.

The complex polarizers of the examples and comparative examples were allowed to stand at 60 ° C and 95% relative humidity for the time shown in Table 1 below, and the degree of polarization was measured. The results are shown in Table 1 and FIG. The degree of polarization was measured using V-7170 (JASCO).

Example 1 Example 2 Comparative Example 1 The high refractive index pattern layer Engraved pattern form cut-lenticular cut-prism cut-lenticular The width (占 퐉) of the first flat portion 9 9 9 Maximum width of engraving pattern (㎛) 10 10 10 Height of engraved pattern (탆) 7 5 7 The width (占 퐉) of the second flat portion 10 10 10 Refractive index 1.58 1.58 1.58 The low refractive index pattern layer Refractive index 1.46 1.46 1.46 Whether or not the first protective layer is included include include Without Polarization degree with time
(%) 0 hours 99.9979 99.9978 99.9948 24 hours 99.9973 99.9976 99.7752 120 hours 99.9977 99.9975 82.2498 260 hours 99.9976 99.9974 43.4177 500 hours 99.9974 99.9974 29.2618

As shown in Table 1 and FIG. 9, it was confirmed that the complex polarizer according to the embodiments of the present invention has good reliability because the degree of polarization is hardly decreased according to the time of leaving at high temperature and high humidity. Although not shown in Table 1, the composite polarizer of the embodiments of the present invention maintained the light transmittance even after being left at high temperature and high humidity, widened the side view angle, and improved visibility and side contrast ratio. On the other hand, in Comparative Example 1 in which the polarizer was laminated on the visibility improving layer without the first protective layer, the degree of polarization was remarkably decreased in accordance with the time of leaving at high temperature and high humidity.

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 (10)

A polarizer, a first protective layer formed on one side of the polarizer, a visible improvement layer formed on the first protective layer, and a second protective layer formed on the visible improvement layer,
Wherein the visibility improving layer includes a low refractive index pattern layer including a high refractive index pattern layer having at least one recessed pattern formed therein and a filling pattern filling at least a part of the recessed pattern and the refractive index of the high refractive index pattern layer is less than the refractive index of the low refractive index pattern layer. Wherein the recessed pattern is a shape in which a top portion of a prism having a triangular section is cut or a top portion of a lenticular lens pattern is cut, a flat portion is formed between the engraved pattern and the adjacent engraved pattern,
Wherein the first protective layer or the second protective layer is a film formed of at least one of polyethylene terephthalate, triacetyl cellulose, cycloolefin polymer, and acrylic resin.
The complex polarizer 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 0.15.
The composite polarizing plate according to claim 1, wherein the first protective layer or the second protective layer has Re of 8000 nm or more in the following formula A:
<Formula A>
Re = (nx - ny) xd
(In the above formula A, nx and ny are the refractive indexes in the slow axis direction, the fast axis direction and the thickness direction of the protective layer at a wavelength of 550 nm, and d is the thickness (unit: nm) of the protective layer).
The composite polarizer according to claim 1, wherein the engraved pattern has a maximum width ratio of the engraved pattern to the period of 0.5 or less.
The composite polarizing plate according to claim 1, wherein an adhesive layer is further formed between the first protective layer and the visibility improvement layer.
The composite polarizer of claim 1, further comprising a third protective layer on the other side of the polarizer.
The complex polarizer according to claim 1, wherein the polarizer, the first protective layer, the low refractive index pattern layer, the high refractive index pattern layer and the second protective layer are sequentially laminated.
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 polarizing plate comprises the complex polarizing plate of any one of claims 1 to 7,
Wherein the composite polarizing plate 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 8, wherein the composite optical sheet has an exit angle of -40 ° to + 40 °.
A liquid crystal display device comprising the module for a liquid crystal display device according to claim 8.
KR1020160012495A 2016-02-01 2016-02-01 Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same KR101802628B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160012495A KR101802628B1 (en) 2016-02-01 2016-02-01 Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160012495A KR101802628B1 (en) 2016-02-01 2016-02-01 Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same

Publications (2)

Publication Number Publication Date
KR20170091453A true KR20170091453A (en) 2017-08-09
KR101802628B1 KR101802628B1 (en) 2017-11-28

Family

ID=59652629

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160012495A KR101802628B1 (en) 2016-02-01 2016-02-01 Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same

Country Status (1)

Country Link
KR (1) KR101802628B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112014997A (en) * 2019-05-31 2020-12-01 三星显示有限公司 Display device
WO2021040312A1 (en) * 2019-08-26 2021-03-04 주식회사 엘지화학 Polarizing plate laminate and display device comprising same
KR20210024803A (en) * 2019-08-26 2021-03-08 주식회사 엘지화학 Polarizing plate and display device comprising the same
KR20210024804A (en) * 2019-08-26 2021-03-08 주식회사 엘지화학 Polarizing plate and display device comprising the same
WO2022097993A1 (en) * 2020-11-04 2022-05-12 동우 화인켐 주식회사 Optical film for improving contrast ratio

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102591785B1 (en) * 2018-10-24 2023-10-23 삼성전자주식회사 Display apparatus
KR20200138560A (en) 2019-05-31 2020-12-10 삼성디스플레이 주식회사 Optical film and display device including the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112014997A (en) * 2019-05-31 2020-12-01 三星显示有限公司 Display device
WO2021040312A1 (en) * 2019-08-26 2021-03-04 주식회사 엘지화학 Polarizing plate laminate and display device comprising same
KR20210024803A (en) * 2019-08-26 2021-03-08 주식회사 엘지화학 Polarizing plate and display device comprising the same
KR20210024804A (en) * 2019-08-26 2021-03-08 주식회사 엘지화학 Polarizing plate and display device comprising the same
US11550184B2 (en) 2019-08-26 2023-01-10 Lg Chem, Ltd. Polarizing plate laminate and display device comprising same
TWI803771B (en) * 2019-08-26 2023-06-01 南韓商Ｌｇ化學股份有限公司 Polarizing plate laminate and display device comprising the same
WO2022097993A1 (en) * 2020-11-04 2022-05-12 동우 화인켐 주식회사 Optical film for improving contrast ratio

Also Published As

Publication number Publication date
KR101802628B1 (en) 2017-11-28

Similar Documents

Publication Publication Date Title
KR101659241B1 (en) Optical film for improving visibility, polarizing plate comprising the same, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same
KR101802628B1 (en) Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same
JP6159385B2 (en) Module for liquid crystal display device and liquid crystal display device including the same
JP6159386B2 (en) Module for liquid crystal display device and liquid crystal display device including the same
KR101871552B1 (en) 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
KR101640718B1 (en) Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same
JP2016161943A (en) Polarizing plate and liquid crystal display including the same
KR101665263B1 (en) Polarizing plate and liquid crystal display apparatus comprising the same
TWI777073B (en) Polarizing plate and optical display comprising the same
KR101665239B1 (en) Polarizing plate and liquid crystal display apparatus comprising the same
KR101813753B1 (en) Liquid crystal display apparatus
KR20180126876A (en) Polarizing plate and optical display apparatus comprising the same
KR101640715B1 (en) Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same
KR102514151B1 (en) Polarizing plate and optical display apparatus comprising the same
US20230288749A1 (en) Polarizing plate and optical display apparatus comprising the same
KR102659452B1 (en) Polarizing plate and optical display apparatus comprising the same
US11874536B2 (en) Polarizing plate and optical display device comprising same
KR101628631B1 (en) Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same
KR20190113464A (en) Optical film for improving visibility, polarizing plate comprising the same and flexible optical display apparatus comprising the same
KR20170103301A (en) Liquid crystal display
KR101955753B1 (en) Optical sheet and optical display apparatus comprising the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant