KR20160081783A

KR20160081783A - Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same

Info

Publication number: KR20160081783A
Application number: KR1020150154142A
Authority: KR
Inventors: 주영현; 김영민; 오영
Original assignee: 삼성에스디아이 주식회사
Priority date: 2014-12-31
Filing date: 2015-11-03
Publication date: 2016-07-08
Also published as: TW201624075A; TW201624074A; KR20160081784A; KR101640719B1; KR101640718B1; TWI649602B; TWI574083B

Abstract

The present invention provides a module for a liquid crystal display device and a liquid crystal display device comprising the same. The module for a liquid crystal display device comprises a first polarization plate, a second polarization plate, and a liquid crystal panel located between the first polarization plate and the second polarization plate. The second polarization plate comprises a polarizer and an optical film formed on the polarizer. The optical film comprises: a high refractive index pattern layer on which at least an intaglio pattern is formed; and a low refractive index pattern layer including a filling pattern which fills at least a portion of the intaglio pattern. A difference between a refractive index of the high refractive index pattern layer and a refractive index of the low refractive index pattern layer is 0.1 to 0.2. The optical film is arranged to allow light, emitted from the liquid crystal panel, to be incident to the low refractive index pattern layer and to be emitted to the high refractive index pattern layer.

Description

TECHNICAL FIELD [0001] The present invention relates to a module for a liquid crystal display device, and a liquid crystal display device including the same. BACKGROUND OF THE INVENTION < RTI ID =

The present invention relates to a module for a liquid crystal display device and a liquid crystal display device including the same.

A liquid crystal display device is operated by emitting light from a backlight unit through a liquid crystal panel. Therefore, the front of the screen of the liquid crystal display device is good in color. However, the side surface of the liquid crystal display device has a lower contrast ratio and lower luminance uniformity than the front surface. In order to increase the color and contrast ratio on the side, deformation of a liquid crystal panel or a liquid crystal structure is attempted.

As the screen of the liquid crystal display device becomes larger, the viewing area greatly extends to the left side and the right side in addition to the front side, and the contrast ratio of the side of the front side can be largely lowered. In addition, as the screen of the liquid crystal display device becomes larger, the width of luminance uniformity decreases. Therefore, the module for the liquid crystal display device must be manufactured separately according to the size of the screen, so that the processability and economical efficiency may be lowered.

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

A problem to be solved by the present invention is to provide a module for a liquid crystal display device capable of increasing side contrast ratio.

Another object of the present invention is to provide a module for a liquid crystal display device capable of increasing a side view angle.

Another object of the present invention is to provide a module for a liquid crystal display device which can increase brightness uniformity.

Another object of the present invention is to provide a module for a liquid crystal display device which is excellent in processability and economical efficiency by minimizing a difference in luminance uniformity according to a screen size of a liquid crystal display device.

The module for a liquid crystal display of the present invention comprises a first polarizing plate, a second polarizing plate, and a liquid crystal panel interposed between the first polarizing plate and the second polarizing plate, wherein the second polarizing plate comprises a polarizer and an optical Wherein the optical film comprises 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, The refractive index difference of the refractive index pattern layer may be 0.1 to 0.2, and the optical film may be arranged such that light emitted from the liquid crystal panel is incident on the low refractive index pattern layer and 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 module for a liquid crystal display device capable of increasing a side contrast ratio.

The present invention provides a module for a liquid crystal display device capable of increasing a side viewing angle.

The present invention provides a module for a liquid crystal display device capable of increasing luminance uniformity.

The present invention provides a module for a liquid crystal display device which is excellent in processability and economy by minimizing a difference in brightness uniformity according to a screen size of a liquid crystal display device.

1 is a schematic cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.
2 is a cross-sectional view of the second polarizer plate of Fig.
3 is an exploded perspective view of the optical film of Fig.
4 is a cross-sectional view of a second polarizer of a module for a liquid crystal display according to another embodiment of the present invention.
5 is a cross-sectional view of a second polarizer of a module for a liquid crystal display according to another embodiment of the present invention.
6 is a cross-sectional view of a second polarizer of a module for a liquid crystal display according to another embodiment of the present invention.
7 is a cross-sectional view of a second polarizer of a module for a liquid crystal display according to another embodiment of the present invention.
8 is a cross-sectional view of a second polarizer of a module for a liquid crystal display according to another embodiment of the present invention
9 is a cross-sectional view of a second polarizer of a module for a liquid crystal display according to another embodiment of the present invention.
10 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.
11 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.
12 is a conceptual diagram of an exit angle.
13 is a schematic diagram of a display device screen when measuring luminance uniformity.
Fig. 14 is a graph showing a measurement of luminance uniformity.

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

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

In 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.).

12, 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 front angle of the liquid crystal display device is 0 degrees, The left end point is -90 °, the right end point is + 90 °, and the luminance is measured at each of -90 ° to + 90 °, and the measured luminance is normalized Means the angle of the point at which the luminance measured at the front is half of the luminance. In Fig. 12, the 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).

As used herein, the term "period" means the sum of the width of the engraved pattern of one of the optical films and the width of one flat portion.

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

Re = (nx - ny) xd

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) .

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

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

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

Hereinafter, a module for a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. Fig. 1 is a schematic cross-sectional view of a module for a liquid crystal display device according to the present embodiment, Fig. 2 is a cross-sectional view of the second polarizing plate of Fig. 1, and Fig. 3 is an exploded perspective view of the optical film of Fig.

1, the module 1 for a liquid crystal display according to the present embodiment may include a first polarizing plate 20, a liquid crystal panel 30, and a second polarizing plate 100.

The first polarizing plate 20 is formed under the liquid crystal panel 30 and can polarize the incident light. The first polarizing plate 20 may include a first polarizer and a first protective layer.

The first polarizer is used to polarize the incident light. The first polarizer may be a polarizer conventionally known to those skilled in the art, for example, a polyvinyl alcohol polarizer in which a polyvinyl alcohol film is uniaxially stretched or a polyene polarizer in which a polyvinyl alcohol film is dehydrated . &Lt; / RTI >

A first protective layer may be formed on the first polarizer to protect the first polarizer. The first protective layer may be an isotropic optical film. 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. Specifically, the first protective layer may have a Re of 5 nm or less, specifically 0.1 nm to 5 nm at a wavelength of 550 nm. The first protective 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. 1, the first polarizing plate 20 may be adhered to the liquid crystal panel 30 by an adhesive layer or an adhesive layer. The adhesive layer or adhesive layer may be formed of a tacky resin, and optionally a composition comprising a crosslinking agent, a silane coupling agent, a photo-radical initiator, or a light-ion initiator. The adhesive layer or the adhesive layer may further increase 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 30 is formed between the first polarizing plate 20 and the second polarizing plate 100 and can transmit the light incident from the first polarizing plate 20 to the second polarizing plate 100. The liquid crystal panel 30 may include a first substrate, a second substrate, and a liquid crystal layer that is a display medium fixed between the first substrate and the second substrate. The first substrate is equipped with a color filter and a black matrix. The second substrate includes a switching element for controlling electro-optical characteristics of the liquid crystal, a switching element for providing a source signal, and a scanning line for providing a gate signal to the signal line, a pixel electrode, and a counter electrode. The liquid crystal layer may include a liquid crystal that is uniformly oriented when the electric field is not visible. Specifically, the liquid crystal panel 30 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 100 is formed on the upper surface of the liquid crystal panel 30 and can polarize and diffuse condensed light incident from the liquid crystal panel 30. As a result, the second polarizing plate 100 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. The second polarizing plate 100 may include a second polarizer, an optical film, and a second protective layer.

Hereinafter, the second polarizing plate 100 according to the present embodiment will be described with reference to FIGS. 2 and 3. FIG. Referring to FIGS. 2 and 3, the second polarizer 100 according to the present embodiment may include a second polarizer 110, an optical film 120, and a second protective layer 130.

The second polarizer 110 is formed on the liquid crystal panel 30 and can polarize the condensed light incident from the liquid crystal panel 30. The second polarizer 100 may include the same or different polarizers as the first polarizer.

The optical film 120 is formed on the second polarizer 110 and is formed directly on the second protective layer 130 so that polarized light incident from the second polarizer 110 can be diffused. At this time, the optical film 120 may be formed directly in contact with the second passivation layer 130. As a result, it is possible to 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.

The optical film 120 may include a low refractive index pattern layer 121 and a high refractive index pattern layer 122. The optical film 120 may be disposed on the liquid crystal display module 1 such that light emitted from the liquid crystal panel 30 is incident on the low refractive index pattern layer 121 and then emitted to the high refractive index pattern layer 122. [ As a result, the effect of improving the side contrast ratio and viewing angle can be enhanced by increasing the diffusion effect of light.

Hereinafter, the optical film 120 according to the present embodiment will be described in detail with reference to FIGS. 2 and 3. FIG. 2 and 3, the optical film 120 according to the present embodiment includes a high refractive index pattern layer 122 in which at least one engraved pattern 127 is formed, and a filling pattern And a low refractive index pattern layer 121 including a low refractive index layer 125.

A first surface 124 is formed on the high refractive index pattern layer 122 and at least one engraved pattern 127 and a flat portion 126 may be formed on the first surface 124. 2 and 3 illustrate an optical film in which one engraved pattern 127 and one flat portion 126 are alternately formed. However, the formation order of each of the engraved pattern 127 and the flat portion 126 is limited It does not. 2 and 3 illustrate a case where the engraved pattern 127 is a lenticular lens pattern including a curved surface, but the present invention is not limited thereto. The curved surface serves as a lens, and the light incident from the second polarizer 110 can be diffused by refracting in various directions depending on the arrival position. The curved surface may be spherical, parabolic, ellipsoidal, hyperbolic, or amorphous. The engraved pattern 127 may be a prism pattern having a curved surface at the top and a triangle or a ten-sided cross-section. Figs. 2 and 3 show smooth curved surfaces without irregularities, but curved surfaces may be further formed to increase the diffusion effect. The engraved pattern 127 may have an aspect ratio H3 / P3 of 1.0 or less, specifically 0.4 to 1.0, more specifically 0.7 to 1.0. Referring to FIG. 2, the aspect ratio is the ratio of the maximum height of the engraved pattern to the maximum width of the engraved pattern. The ratio B / A of the sum B of the maximum width P3 of the engraved pattern 127 to the entire width A of the high refractive index pattern layer 122 is 40% to 60%, specifically 45% To 55%. It is possible to 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 in the aspect ratio and the ratio range.

Referring again to FIG. 2, the width P3 of the engraved pattern 127 may be 30 占 퐉 or less, specifically, 5 占 퐉 to 20 占 퐉. The maximum height H3 of the engraved pattern 127 may be 20 占 퐉 or less, specifically 15 占 퐉 or less, more specifically 5 占 퐉 to 15 占 퐉, and more particularly, 5 占 퐉 to 10 占 퐉. In the range of width and height, there may be diffusion effect.

The flat portion 126 is formed between the engraved pattern 127 and the engraved pattern 127 so that the light reaching the flat portion 126 is totally reflected and emitted by the engraved pattern 127 to diffuse the condensed light. The width P4 of the flat portion 126 may be equal to or greater than the maximum width P3 of the engraved pattern 127 (P4? P3). The ratio P3 / P4 of the maximum width P3 of the engraved pattern 127 to the width P4 of the flat portion 126 may be 1 or less. The ratio P3 / C of the maximum width P3 of the engraved pattern 127 to the period C may be 0.5 or less. In the above range, the light converging and diffusing effect may be large. The light reaching the low refractive index pattern layer 121 is diffused by the light that is not reflected by the filling pattern 125 by the flat portion 126 so that the diffusing effect of condensation can be increased, The effect of diffusing the condensed light can be great by arranging in the period (C).

The high refractive index pattern layer 122 may have a refractive index of 1.0 or more, specifically 1.50 or more, more specifically 1.50 to 1.60. Within this range, the light diffusion effect is excellent. The high refractive index pattern layer 122 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 low refractive index pattern layer 121 is formed on the second polarizer 110 so that the polarized light incident from the second polarizer 110 in one direction is refracted in various directions according to the incident position and emitted to diffuse the light .

The low refractive index pattern layer 121 may be formed of a material having a lower refractive index than that of the high refractive index pattern layer 122, and the refractive index 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 and the production can be facilitated. The low refractive index pattern layer 121 may be formed of a composition including a transparent resin that is ultraviolet curable. Specifically, the resin may include at least one of (meth) acrylic, polycarbonate, silicone, and epoxy resin, but is not limited thereto. The composition may further comprise conventional initiators for pattern layer formation.

The low refractive index pattern layer 121 includes a second surface 123 facing the first surface 124 of the high refractive index pattern layer 122 and may include one or more fill patterns 125. The fill pattern 125 may fill at least a portion of the engraved pattern 127 of the high refractive index pattern layer 122. The "filling at least a part" includes both cases where the engraving pattern 127 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. 3 shows an optical film in which the filling pattern 125 and the engraved pattern 127 are formed in an elongated form of a stripe shape, but the filling pattern 125 and the engraved pattern 127 may be formed in a dot shape. The "dot" means that the combination of the projected portion and the engraved pattern is dispersed.

The refractive index difference between the high refractive index pattern layer 122 and the low refractive index pattern layer 121 may be 0.20 or less, specifically 0.10 to 0.20, more specifically 0.10 to 0.15. In the above range, there may be a condensing and diffusing effect.

Although not shown in Figs. 2 and 3, at least one of the high refractive index pattern layer and the low refractive index pattern layer may include a light diffusing agent. As a result, the horizontal viewing angle in the horizontal direction of the display device screen and the vertical viewing angle in the vertical direction can be improved at the same time. Further, even if the height of the engraved pattern is lower than that of the high refractive index pattern layer not containing the light diffusing agent, the effect of improving the viewing angle may be large. As the light diffusing agent, an organic light diffusing agent, an inorganic light diffusing agent, or a mixture thereof may be used. The mixture of the organic light-diffusing agent and the inorganic light-diffusing agent can improve the diffusibility and transmittance of the low-refractive-index pattern layer or the high-refractive-index pattern layer. The light diffusing agents may be included singly or in combination of two or more. The organic light-diffusing agent may include at least one of (meth) acrylic-based particles, siloxane-based particles, and styrene-based particles. The inorganic light-diffusing agent may include at least one of calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide and zinc oxide. In particular, when the inorganic light diffusing agent contains only the organic light diffusing agent, the decrease in contrast whiteness can be prevented and the light diffusing property can be increased. The light diffusing agent is not limited in shape and particle size. Specifically, the light-diffusing agent may include spherical cross-linked particles, and the average particle diameter may be 0.1 탆 to 30 탆, specifically 0.5 탆 to 10 탆, more specifically 1 탆 to 5 탆. Within this range, the light diffusion effect can be realized, the surface roughness of the pattern layer is increased, and the adhesion with the second protective layer is not a problem, and the degree of dispersion can be good. The light diffusing agent may be contained in the high refractive index pattern layer, the low refractive index pattern layer alone, or the high refractive index pattern layer and the low refractive index pattern layer in an amount of 0.1 wt% to 20 wt%, specifically 1 wt% to 15 wt%. Within this range, there may be a light diffusion effect. When a light-diffusing agent is used for the low-refractive-index pattern layer, the range of the refractive index of the resin is widened and the cost is reduced.

Hereinafter, the second protective layer 130 will be described. The second protective layer 130 may be formed on the high refractive index pattern layer 122 or the low refractive index pattern layer 121 to protect the optical film 120 and support the optical film 120. 2 illustrates the case where the second passivation layer 130 is formed directly on the high refractive index pattern layer 122 but the present invention is not limited thereto and the second passivation layer 130 may be formed on the low refractive index pattern layer 121 ). &Lt; / RTI > That is, FIG. 2 shows a structure in which the low refractive index pattern layer 121, the high refractive index pattern layer 122, and the second protective layer 130 are sequentially stacked in this order. However, the second protective layer 130 may have a structure in which the second protective layer 130, the low refractive index pattern layer 121 and the high refractive index pattern layer 122 are sequentially stacked in this order. In this case, And can be integrated with the polarizer 110 and the adhesive layer.

The second protective layer 130 may have a Re of 10,000 nm or more, specifically, 10,000 nm or more, more specifically, 10,100 nm to 15,000 nm. Within this range, it is possible to prevent rainbow stains from being visible. The second protective layer 130 may be a film obtained by uniaxially or biaxially stretching an optically transparent resin. Specifically, the resin is selected from the group consisting of a polyester including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like, acrylic, cyclic olefin polymer (COP), triacetyl cellulose Polyvinyl acetate, polyvinyl chloride (PVC), polynorbornene, polycarbonate (PC), polyamide, polyacetal, polyphenylene ether, polyphenylene sulfide, polysulfone, polyethersulfone , Polyarylate, and polyimide. The second protective layer may comprise a film produced after the modification of the above-mentioned resin. Such modification may include copolymerization, branching, cross-linking, or molecular terminal modification, and the like. The second protective layer 130 and the optical film 120 may be integrated. The "integral" means that the second protective layer 130 and the optical film 120 are not separated from each other independently.

Although not shown in FIG. 2, an adhesive layer may be formed between the second polarizer 110 and the optical film 120. In one embodiment, the adhesive layer may be formed of a photocurable adhesive including an epoxy resin, a (meth) acrylic monomer, a photoinitiator, or the like, or a polyvinyl alcohol-based water-based adhesive. The adhesive layer may further enhance the light diffusion effect by further including a light diffusing agent.

Further, although not shown in FIG. 2, a functional layer may be further formed on the second protective layer 130. The functional layer may be formed on the second protective layer 130 by an anti-reflection, a low reflection, a hard coating, an anti-glare, anti-finger, (anti-contamination), diffusion, and refraction. In one embodiment, the functional layer may be formed as a separate, independent layer on the second passivation layer 130. For example, the functional layer may be formed by applying a composition for forming a functional layer on the second protective layer 130, or may be laminated on the second protective layer 130 through an adhesive layer or an adhesive layer. In other embodiments, the functional layer may be formed such that one side of the second protective layer 130 is a functional layer.

Although not shown in FIG. 2, when the second protective layer 130, the low refractive index pattern layer 121, and the high refractive index pattern layer 122 are sequentially stacked in this order, the functional layer has a high refractive index pattern May be formed as separate, independent layers on layer 122. Referring to FIG. 4, the second polarizing plate 100 'may include an optical film 120' including a high refractive index pattern layer 122 'formed by surface-treating the first polarizing plate 100' have. For example, the high refractive index pattern layer 122 'may be formed to have irregularities on one surface or may be formed such that one surface of the high refractive index pattern layer 122' becomes a functional layer using fine particles or the like.

Hereinafter, a method of manufacturing the second polarizing plate according to this embodiment will be described.

First, a laminate of the second protective layer and the optical film is produced. Specifically, a resin for a high refractive index pattern layer is coated on one surface of the second protective layer. The coating method is not particularly limited. For example, bar coating, spin coating, dip coating, roll coating, flow coating, die coating, and the like. Then, the pattern is transferred using a pattern film on which a filling pattern and a flat portion are formed on the coating layer. Then, the resin for the low refractive index pattern layer is filled and coated in the transferred pattern and cured. The curing may include one or more of light curing, heat curing. Photocuring may involve irradiation with light amount of 10mJ / cm ² to 1000mJ / cm ² at a wavelength of 400nm or less. Thermal curing may include treating at 40 占 폚 to 200 占 폚 for 1 hour to 30 hours. Within this range, the resin for the pattern layer can be sufficiently cured.

Thereby producing a second polarizer. The second polarizer may be manufactured by a conventional method. In one embodiment, the second polarizer can be produced by swelling, stretching, and dyeing a polyvinyl alcohol-based resin film. Swelling, stretching, and dyeing may be performed by conventional methods known to those skilled in the art. In another embodiment, the second polarizer may be prepared by dewatering a polyvinyl alcohol-based resin film.

An adhesive for a polarizing plate is coated on one side of the optical film in the laminate, and the second polarizer is prepared by laminating with a second polarizer and then curing.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 5 is a cross-sectional view of a second polarizing plate according to this embodiment.

The module for a liquid crystal display device according to this embodiment may include a first polarizing plate, a liquid crystal panel, and a second polarizing plate. Except that the second polarizing plate of FIG. 5 is included in place of the second polarizing plate of FIG. 2, the module is substantially the same as the module for a liquid crystal display according to an embodiment of the present invention. Hereinafter, only the second polarizing plate of Fig. 5 will be described.

5, the second polarizing plate 200 includes a second polarizer 110, an optical film 140 including a low refractive index pattern layer 141 and a high refractive index pattern layer 142, 130). The second polarizer 110 and the second protective layer 130 are substantially the same as those of the second polarizer according to an embodiment of the present invention. Here, the optical film 140 will be mainly described.

The optical film 140 is formed on the second polarizer 110 and directly below the second protective layer 130 so that polarized light incident from the second polarizer 110 can be diffused. As a result, it is possible to increase the side contrast ratio, increase the side viewing angle, and increase the luminance uniformity.

5, the optical film 140 according to the present embodiment includes a high refractive index pattern layer 142 in which at least one intaglio prism pattern 144 is formed, and a high refractive index pattern layer 142 in which a filling pattern And a low refractive index pattern layer 141 including a low refractive index layer 143.

FIG. 5 shows a second polarizer plate including a relief prism pattern 144 whose cross section is triangular. However, it may include a prism pattern whose cross section is an n-angular shape (n is an integer of 4 to 10). 5 shows the optical film without the flat portion, but the flat portion 126 of FIG. 2 may be further formed between the intaglio prism patterns 144. Further, the irregularities are further formed in the intaglio prism pattern of FIG. 5, thereby increasing the diffusion effect. In addition, a curved surface may be formed at the top of the intaglio prism pattern of Fig.

The negative prism pattern 144 may have a width P5 of 5 占 퐉 to 20 占 퐉, specifically, 7 占 퐉 to 15 占 퐉. The recessed prism pattern 144 may have a height H5 of 3 탆 to 16 탆, specifically, 4 탆 to 16 탆. The intaglio prism pattern 144 may have a vertex angle? Of 55 to 90 degrees, specifically, 65 to 80 degrees. The negative prism pattern 144 may have an aspect ratio of 0.50 to 0.96, specifically 0.6 to 0.8. In the range of width, height, apex angle and aspect ratio, there may be a light diffusion effect.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 6 is a cross-sectional view of a second polarizer plate of the module for a liquid crystal display device according to the present embodiment.

The module for a liquid crystal display according to another embodiment of the present invention may include a first polarizer, a liquid crystal panel, and a second polarizer. The second polarizing plate of Fig. 2 is substantially the same as the module of the liquid crystal display according to the embodiment of the present invention, except that the second polarizing plate of Fig. 6 is included. Hereinafter, only the second polarizing plate of Fig. 6 will be described.

6, the second polarizer 300 according to the present embodiment includes a second polarizer 110, an optical film 150 including a low refractive index pattern layer 151 and a high refractive index pattern layer 152, And may include a second protective layer 130. The high refractive index pattern layer 152 includes the engraved pattern 153 and the flat portion 154 and the curved surface 155 may be formed at the interface where the engraved pattern 153 and the flat portion 154 meet. As a result, the diffusion effect of condensed light can be larger. The low refractive index pattern layer 151 may include a filling pattern 156 filling the engraved pattern 153.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 7 is a cross-sectional view of the second polarizer plate of the module for a liquid crystal display device according to the present embodiment.

The module for a liquid crystal display according to another embodiment of the present invention may include a first polarizer, a liquid crystal panel, and a second polarizer. The second polarizing plate of Fig. 2 is substantially the same as the module of the liquid crystal display according to the embodiment of the present invention except that the second polarizing plate of Fig. 7 is included. Only the second polarizing plate of Fig. 7 will be described.

Referring to FIG. 7, the second polarizer 400 according to the present embodiment includes a high refractive index pattern layer 122 having a second polarizer 110, an engraved pattern 127 and a flat portion 126, And an optical film 160 including a first protective layer 161 and a second protective layer 130. The thickness of the low refractive index pattern layer 161 and the height of the engraved pattern 127 are substantially equal to each other, except for the second polarizer plate of FIG.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 8 is a cross-sectional view of the second polarizer plate of the module for a liquid crystal display device according to the present embodiment.

The module for a liquid crystal display according to another embodiment of the present invention may include a first polarizer, a liquid crystal panel, and a second polarizer. 8 is substantially the same as the module for a liquid crystal display according to an embodiment of the present invention, except that the second polarizing plate of Fig. 8 is included instead of the second polarizing plate of Fig. Thus, only the second polarizing plate of Fig. 8 will be described.

Referring to FIG. 8, the second polarizer 500 according to the present embodiment includes a second polarizer 110, an optical film 120 including a low refractive index pattern layer 121 and a high refractive index pattern layer 122, 2 protective layer 130 and a third protective layer 170. [ Is substantially the same except that it further includes a third protective layer 170 as compared to the second polarizing plate of FIG.

The third protective layer 170 is formed under the second polarizer 110 to protect the second polarizer 110 and prevent the second polarizer 500 from being warped under severe conditions with the second protective layer 130. [ .

The third protective layer 170 may be a film obtained by uniaxially or biaxially stretching an optically transparent resin. Specifically, the resin is selected from the group consisting of a polyester including polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like, a cellulose ester including acrylic, cyclic olefin polymer, triacetyl cellulose and the like, polyvinyl acetate , Polyvinyl chloride, polynorbornene, polycarbonate, polyamide, polyacetal, polyphenylene ether, polyphenylene sulfide, polysulfone, polyether sulfone, polyarylate, and polyimide . The third protective layer 170 may comprise a film produced after the modification of the above-mentioned resin. Such modification may include copolymerization, branching, cross-linking, or molecular terminal modification, and the like. The third passivation layer 170 may have a viewing angle compensation function with a predetermined range of retardation. Specifically, the third protective layer 170 may have a Re of 40 nm to 60 nm at a wavelength of 550 nm. The viewing angle can be compensated in the above range to improve the image quality.

8 shows a case where the optical film 120 is formed between the second protective layer 130 and the second polarizer 110 but the optical film 120 is formed between the second polarizer 110 and the third protective layer 170, the third protective layer 170, the low refractive index pattern layer 121, the high refractive index pattern layer 122, the second polarizer 110, and the second protective layer 130 are formed in this order And may include sequentially formed structures.

Although not shown in FIG. 8, an adhesive layer may be further formed on the lower surface of the third passivation layer 170 to facilitate adhesion to the liquid crystal panel 30. The adhesive layer is as described above. Although not shown in FIG. 8, an adhesive layer may be formed between the second polarizer 110 and the third passivation layer 170.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 9 is a cross-sectional view of a second polarizer plate of the module for a liquid crystal display device according to the present embodiment.

The module for a liquid crystal display according to another embodiment of the present invention may include a first polarizer, a liquid crystal panel, and a second polarizer. Except for the second polarizing plate of Fig. 9, instead of the second polarizing plate of Fig. 2, which is substantially the same as the module for a liquid crystal display according to an embodiment of the present invention. Thus, only the second polarizing plate of Fig. 9 will be described.

9, the second polarizer 600 according to the present embodiment includes a second polarizer 110, an optical film 120 including a low refractive index pattern layer 121 and a high refractive index pattern layer 122, 3 protective layer 170, as shown in FIG. The optical film 120 is formed on the lower portion of the second polarizer 110 and is directly formed on the third protective layer 170 and that the second protective layer 130 is excluded, Is substantially the same as the second polarizing plate 500 of FIG.

Hereinafter, a module for a liquid crystal display according to another embodiment of the present invention will be described with reference to FIG. 10 is a perspective view of a composite optical sheet of a module for a liquid crystal display device according to the present embodiment.

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.

10, the composite optical sheet 10 according to the present embodiment includes a first optical sheet 12 including at least one first prism pattern 11 on one surface thereof, and a second optical sheet 12 on the first optical sheet 12 And a second optical sheet 14 formed on one side and including at least one second prism pattern 13.

The composite optical sheet 10 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, so that the incident light can be condensed and emitted to enhance the contrast ratio of the side surface.

The first optical sheet 12 may be positioned below the second optical sheet 14. The first optical sheet 12 has a light exit surface serving as a top surface and a light incident surface serving as a bottom surface, so that the path of incident light can be changed and output to the second optical sheet 14. The first optical sheet 12 may include a first base film 15 and at least one first prism pattern 11 formed on the first base film 15. [

The first base film 15 supports the first optical sheet 12 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 15 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 11 is formed on the upper surface of the first optical sheet 12, and light incident from the lower surface can be condensed to increase the brightness. 2 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 11 may be a prism having a polygon having 4 to 10 sides. The height H1 of the first prism pattern 11 may be 5 占 퐉 to 50 占 퐉, specifically 5 占 퐉 to 40 占 퐉, more specifically, 10 占 퐉 to 30 占 퐉. The first prism pattern 11 may have an apex angle alpha of 80 DEG to 100 DEG, specifically, 85 DEG to 95 DEG. 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 11 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 11 may be formed of a composition containing an ultraviolet curable unsaturated compound, an initiator, or the like, or may be formed of the same or a different kind of material for the first base film 15. As an example, the ultraviolet curable unsaturated compound may be at least one compound 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 11 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 14 is formed on the upper surface of the first optical sheet 12 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 12 . The second optical sheet 14 may include a second base film 16 and a second prism pattern 13 formed on the second base film 16.

The second base film 16 supports the second optical sheet 14 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 16 may be formed of the same or different resin as the first base film 15. The thickness of the second base film 16 may be the same as or different from that of the first base film 15.

The second prism pattern 13 is formed on the upper surface of the second optical sheet 14, and light incident from the lower surface can be condensed to increase the brightness. 2 illustrates a second prism pattern 13 having a triangular cross section, but the present invention is not limited thereto. The cross section of the second prism pattern 13 may be a prism having a polygon having 4 to 10 sides. The second prism pattern 13 may be formed of the same material as the first prism pattern 11 or a different material. The height H2 of the second prism pattern 13 may be 5 占 퐉 to 50 占 퐉, specifically 5 占 퐉 to 40 占 퐉, and more particularly, 10 占 퐉 to 30 占 퐉. The second prism pattern 13 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 13 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 13 to the aspect ratio A ¹ of the first prism pattern 11 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 13 may be an elongated form of a stripe shape and the longitudinal direction may be substantially orthogonal to the longitudinal direction of the first prism pattern 11. The "substantially orthogonal" includes not only fully orthogonal but also some errors.

A diffuser may be further included between the composite optical sheet 10 and the first polarizing plate 20. The diffuser plate protects the composite optical sheet 10 and may include a light diffusing agent.

10 shows a case where the second optical sheet 14 and the first optical sheet 12 are laminated without an adhesive layer interposed therebetween. However, it may also include a composite optical sheet in which an adhesive layer is formed on the lower surface of the first optical sheet 12 and a second prism pattern 13 of the second optical sheet 14 penetrates the adhesive layer. 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. 11 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.

11, the liquid crystal display device 2 according to an embodiment of the present invention includes a light source 40, a light guide plate 60 for guiding light emitted from the light source 40, A reflective sheet 70 positioned on the top of the light guide plate 60, a liquid crystal display module 80 located on the top of the diffusion sheet 70, And the liquid crystal display module 80 may include a module for a liquid crystal display according to embodiments of the present invention.

The light source 40 generates light and may be disposed on the side surface of the light guide plate 60 (edge type). The light source 40 may be a variety of light sources such as a circular light source lamp, a surface light source lamp, a CCFL, or an LED. A light source cover 41 may be disposed outside the light source 40.

The light guide plate 60 guides the light generated by the light source 40 to the diffusion sheet 70. It can be omitted when adopting a direct-type light source.

The reflective sheet 50 reflects the light generated by the light source 40 and supplies the light to the diffusion sheet 70.

The diffusion sheet 70 diffuses and scatters the light incident through the light guide plate 60 and supplies the light to the liquid crystal display device.

11 shows a liquid crystal display device in which the light source 40 is disposed on the side surface of the light guide plate 60. The light source 40 may be disposed on the lower surface of the light guide plate 60 60 may be omitted, and a diffuser 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.

Production Example 1: Production of composite optical sheet

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

The 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 to the coating using a pattern roll having a prism pattern (height: 12 占 퐉, width: 24 占 퐉, apex angle: 90 占) and cured to form a second optical sheet having a second prism pattern .

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.

Production Example 2: Production of composite optical sheet

A composite optical sheet was produced in the same manner as in Production Example 1, except that a microlens pattern having the specifications in Table 1 below was formed instead of the prism pattern on one surface of the PET film for the first base film.

The first optical sheet The second optical sheet Outgoing angle
(°) pattern Height
(탆) width
(탆) Aspect ratio pattern Height
(탆) width
(탆) Aspect ratio Production Example 1 prism 12 24 0.5 prism 12 24 0.5 -28 / + 28 Production Example 2 Micro lens 15 30 0.5 prism 12 24 0.5 -40 / + 40

Production Example 3: 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) as a first protective layer to prepare a first polarizer plate.

Example 1: Fabrication of Module for Liquid Crystal Display Device

(1) Production of the second polarizing plate

Polarizers were prepared in the same manner as in Production Example 3.

(SSC155, Shin-A T & C) was coated on one side of a transparent PET film for a second protective layer (Toyobo, SRF, thickness: 80 m, Re = 14000 nm at a wavelength of 550 nm) to obtain a coating. A lenticular lens pattern and a flat portion of a negative lenticular lens were applied to the coating using a film in which a bent lenticular lens pattern (width: 10 mu m, height: 10 mu m) and a flat portion (width: 10 mu m) , Thereby forming a high refractive index pattern layer. An ultraviolet curable resin (SSC140, ShinA & T & C) was coated on the high refractive index pattern layer to completely fill and cure the intaglio lenticular lens pattern to form an optical film having a low refractive index pattern layer immediately on the high refractive index pattern layer.

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

(2) Manufacturing of module for liquid crystal display device

The composite optical sheet of Production Example 1, the first polarizing plate of Production Example 3, the liquid crystal panel (PVA mode), and the second polarizing plate prepared above were assembled successively to prepare a module for a liquid crystal display device.

Example 2: Fabrication of module for liquid crystal display device

(1) Production of the second polarizing plate

Polarizers were prepared in the same manner as in Production Example 3.

(SSC155, Shin-A T & C) was coated on one side of a transparent PET film for a second protective layer (Toyobo, SRF, thickness: 80 m, Re = 14000 nm at a wavelength of 550 nm) to obtain a coating. A prismatic pattern is applied to the coating using a film having a prismatic pattern (width: 13 μm, height: 10 μm, apex angle: 65.5 °, cross-section: triangle) formed on the coating film and cured to form a high refractive index pattern layer . The high refractive index pattern layer was coated with an ultraviolet ray hardening resin (SSC140, Shin-A & T) to completely fill the prism pattern and to cure the intaglio prism pattern to form an optical film having a low refractive index pattern layer immediately on the high refractive index pattern layer.

(2) Manufacturing of module for liquid crystal display device

Example 3: Fabrication of module for liquid crystal display device

Polarizers were prepared in the same manner as in Production Example 3.

(SSC155, Shin-A T & C) was coated on one side of a transparent PET film for a second protective layer (Toyobo, SRF, thickness: 80 m, Re = 14000 nm at a wavelength of 550 nm) to obtain a coating. A lenticular lens pattern and a flat portion of a negative lenticular lens were applied to the coating using a film in which a bent lenticular lens pattern (width: 10 mu m, height: 10 mu m) and a flat portion (width: 10 mu m) , Thereby forming a high refractive index pattern layer. The intaglio lenticular lens pattern was completely filled with the ultraviolet curable resin (SSC 143, ShinA & T & C) coated on the high refractive index pattern layer and cured to form an optical film having a low refractive index pattern layer formed directly on the high refractive index pattern layer.

(Z-200, manufactured by Nippon Goshei Co., Ltd.) was coated on one side of each of the low refractive index pattern layer and the third protective layer TAC film (KC4DR-1, Konica Corp., thickness 40 mu m, Japan) And cured to prepare a second polarizing plate.

Example 4: Fabrication of module for liquid crystal display device

Polarizers were prepared in the same manner as in Production Example 3.

(SSC155, ShinA T & C) was coated on one side of a transparent PET film for a second protective layer (Toyobo, SRF, thickness: 80 m, Re = 14000 nm at a wavelength of 550 nm). A prismatic pattern is applied to the coating using a film having a prismatic pattern (width: 13 μm, height: 10 μm, apex angle: 65.5 °, cross-section: triangle) formed on the coating film and cured to form a high refractive index pattern layer . The high refractive index pattern layer was coated with an ultraviolet ray hardening resin (SSC 143, Shin-A & T) to completely fill the prism pattern and to cure the intaglio prism pattern to form an optical film having a low refractive index pattern layer formed directly on the high refractive index pattern layer.

Comparative Example 1: Fabrication of module for liquid crystal display device

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

A transparent PET film for a second protective layer (Toyobo, SRF, thickness: 80 mu m, Re: 14000 nm at a wavelength of 550 nm) and a TAC film for a third protective layer (KC4DR -1, Japan, Konica Corp., thickness: 40 탆) were laminated to prepare a polarizing plate.

The composite optical sheet of Production Example 2, the first polarizing plate of Production Example 3, the liquid crystal panel (PVA mode), and the polarizing plate thus prepared were assembled to prepare a module for a liquid crystal display device.

Comparative Example 2: Fabrication of module for liquid crystal display device

The composite optical sheet of Production Example 1, the first polarizing plate of Production Example 3, the liquid crystal panel (PVA mode), and the 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 and FIG.

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

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

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

(4) Luminance uniformity: A liquid crystal display device is manufactured by assembling a screen of an LED light source, a light guide plate, a module for a liquid crystal display device, and a display device having a major axis and a minor axis. 13, when the center point of the display device is B, the left end point is A, and the right end point is C, in a liquid crystal display device in which a light source, a light guide plate, and a module for a liquid crystal display device are assembled, B and C are measured, and the maximum luminance value (luminance max) and the minimum luminance value (luminance min) are obtained. The luminance uniformity is a value calculated by (luminance min) / (luminance max) x 100. At this time, the brightness is measured by fixing EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM Co.) to point B and changing the measuring direction of the luminance meter to each of points A, B and C.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Composite optical sheet Production Example 1 Production Example 1 Production Example 1 Production Example 1 Production Example 2 Production Example 1 Outgoing angle (°) -28, +28 -28, +28 -28, +28 -28, +28 -40, +40 -28, +28 The high refractive index pattern layer Refractive index 1.57 1.57 1.57 1.57 - - Engraved pattern Lenticular prism Lenticular prism - - Aspect ratio of engraved pattern 1.0 0.77 1.0 0.77 - - Flatness has exist none has exist none - - The low refractive index pattern layer Refractive index 1.42 1.42 1.45 1.45 - - Difference in refractive index * 0.15 0.15 0.12 0.12 - - Luminance The center luminance value (nit) 182 183 192 203 179 241 Relative luminance
(%) 101 102 107 113 100 135 1/2 Viewing Angle (°) Right and left 65.5 70.3 62.9 60.8 69.0 50.4 Upper and Lower 46.1 43.8 46.0 44.7 72.1 46.0 1/3 Viewing Angle (°) Right and left 82.2 82.5 77.5 73.2 90.6 60.6 Upper and Lower 57.0 54.9 57.2 55.8 90.2 56.6 Contrast ratio (0 [deg.], 0 [deg.]) 12776 10389 12583 14672 13301 20207 (180 DEG, 0 DEG) 1383 1546 1416 1346 902 959 (0 [deg.], 60 [deg.]) 1436 1579 1434 1470 907 973 Luminance uniformity (%) 40 inches 87.8 74.5 - - - 79.3 46 inches 84.5 73.1 - - - 73.6 50 inches 80.5 71.7 - - - 66.1 55 inches 77.1 70.7 - - - 61.1

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

As shown in Table 2, the module for a liquid crystal display device according to the present embodiment can increase the luminance value at the front side, increase the side viewing angle by increasing the half viewing angle and the 1/3 viewing angle, The contrast ratio can be increased. In addition, the brightness uniformity can be increased, and even when the size of the liquid crystal display device is changed by minimizing the change in luminance uniformity according to the size of the liquid crystal display device as shown in FIG. 14, it is not necessary to change the module, and the fairness and economy can be improved.

On the other hand, Comparative Example 1 in which the optical film of this embodiment was not employed had a low side contrast ratio and a low relative luminance value.

In Comparative Example 2 in which the optical film of this example was not employed, the relative luminance was high, but the viewing angle and contrast ratio improvement effect was low. Also, as shown in FIG. 14, the rate of change of the luminance uniformity according to the size of the liquid crystal display device according to the present embodiment is large, so that fairness and economical efficiency may be deteriorated.

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

Claims

A first polarizing plate, a second polarizing plate, and a liquid crystal panel positioned between the first polarizing plate and the second polarizing plate,
Wherein the second polarizer comprises a polarizer and an optical film formed on the polarizer,
Wherein the optical film 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 refractive index difference between the high refractive index pattern layer and the low refractive index pattern layer is 0.1 to 0.2,
Wherein the optical film is arranged such that light emitted from the liquid crystal panel is incident on the low refractive index pattern layer and is emitted to the high refractive index pattern layer.
Module for liquid crystal displays.

The liquid crystal display module according to claim 1, wherein the liquid crystal panel is a patterned vertical alignment (PVA) mode.

The module for a liquid crystal display device according to claim 1, wherein the engraved pattern has an aspect ratio of 1.0 or less.

The liquid crystal display device according to claim 1, wherein the engraved pattern comprises a lenticular lens pattern, a prism pattern having a triangular to a pentagonal cross section, or a prism pattern having a curved top and a triangular to a pentagonal cross section module.

The module for a liquid crystal display device according to claim 1, wherein the high refractive index pattern layer has a ratio (P3 / C) of a maximum width (P3) of the engraved pattern to a period (C)

The module for a liquid crystal display device according to claim 1, wherein the high refractive index pattern layer is further provided with a flat portion between the engraved pattern and the engraved pattern.

The module for a liquid crystal display device according to claim 1, wherein the low refractive index pattern layer has a refractive index of less than 1.50.

The liquid crystal display module according to claim 1, wherein the high refractive index pattern layer has a refractive index of 1.50 or more.

The module for a liquid crystal display according to claim 1, wherein the filling pattern fully fills the engraved pattern.

The module for a liquid crystal display according to claim 1, wherein the second polarizing plate further comprises a second protective layer formed on the optical film.

The liquid crystal display device according to claim 10, wherein the second polarizer comprises a polarizer, the low refractive index pattern layer, the high refractive index pattern layer formed directly on the low refractive index pattern layer, Is a sequentially stacked structure; or
A structure in which the high refractive index pattern layer directly formed on the polarizer, the second protective layer formed on the polarizer, the low refractive index pattern layer formed on the second protective layer, and the low refractive index pattern layer are sequentially stacked And a liquid crystal layer.

The module for a liquid crystal display apparatus according to claim 11, wherein the second protective layer is formed of at least one of a resin selected from the group consisting of polyethylene terephthalate, triacetyl cellulose, acrylic, and cyclic olefin polymer.

The liquid crystal display according to claim 10, wherein the second polarizer further comprises a functional layer, and the functional layer is formed as a separate layer on the second protective layer or the high refractive index pattern layer,
Wherein one surface of the second protective layer or the high refractive index pattern layer is formed to be a functional layer.

The liquid crystal display according to claim 1, further comprising a composite optical sheet at a lower portion of the first polarizer plate,
Wherein the composite optical sheet includes a first optical sheet including at least one first prism pattern on one surface thereof and a second optical sheet formed on the first optical sheet and including at least one second prism pattern on one surface thereof, Wherein the engraved pattern is a lenticular lens pattern, and a flat portion is further formed between the engraved pattern and the engraved pattern.

The liquid crystal display according to claim 1, further comprising a composite optical sheet at a lower portion of the first polarizer plate,
Wherein the composite optical sheet includes a first optical sheet including at least one first prism pattern on one surface thereof and a second optical sheet formed on the first optical sheet and including at least one second prism pattern on one surface thereof, Wherein the engraved pattern is a prism pattern.

16. The module for a liquid crystal display device according to claim 14 or 15, wherein the liquid crystal display module further comprises a diffusion plate and a light source sequentially formed under the composite optical sheet.

16. The module for a liquid crystal display device according to claim 14 or 15, wherein the module for a liquid crystal display further comprises a light guide plate and a light source at a lower portion of the composite optical sheet, and the light source is disposed at a side surface of the light guide plate.

16. The module for a liquid crystal display device according to claim 14 or 15, wherein the composite optical sheet emits light at an exit angle of -40 DEG to + 40 DEG.

A liquid crystal display device comprising the liquid crystal display module according to claim 1.