KR101640718B1 - Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same - Google Patents
Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same Download PDFInfo
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- KR101640718B1 KR101640718B1 KR1020150154142A KR20150154142A KR101640718B1 KR 101640718 B1 KR101640718 B1 KR 101640718B1 KR 1020150154142 A KR1020150154142 A KR 1020150154142A KR 20150154142 A KR20150154142 A KR 20150154142A KR 101640718 B1 KR101640718 B1 KR 101640718B1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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Abstract
And a liquid crystal panel disposed between the first polarizing plate and the second polarizing plate, wherein the second polarizing plate includes an optical film formed on the polarizer and the polarizer, Wherein the refractive index difference between the high refractive index pattern layer and the low refractive index pattern layer is in the range of 0.1 to 5 nm, and the low refractive index pattern layer comprises 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, 0.2, and the optical film is arranged so 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, and a liquid crystal display device including the same .
Description
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)
<Formula A>
Re = (nx - ny) xd
<Formula B>
Rth = ((nx + ny) / 2 - nz) xd
(Where nx, ny and nz are refractive indexes in the slow axis direction, the fast axis direction and the thickness direction of the optical element at a wavelength of 550 nm, and d is the thickness (unit: nm) of the optical element) .
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
The first polarizing
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 . ≪ / 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
The
The second
Hereinafter, the second
The
The
The
Hereinafter, the
A
Referring again to FIG. 2, the width P3 of the
The
The high refractive
The low refractive
The low refractive
The low refractive
The refractive index difference between the high refractive
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
The second
Although not shown in FIG. 2, an adhesive layer may be formed between the
Further, although not shown in FIG. 2, a functional layer may be further formed on the second
Although not shown in FIG. 2, when the second
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
The
5, the
FIG. 5 shows a second polarizer plate including a
The
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
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
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
The third
The third
8 shows a case where the
Although not shown in FIG. 8, an adhesive layer may be further formed on the lower surface of the
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
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
The composite
The first
The
The
The second
The
The
A diffuser may be further included between the composite
10 shows a case where the second
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
The
The
The
The
11 shows a liquid crystal display device in which the
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.
(°)
(탆)
(탆)
(탆)
(탆)
Production Example 3: Production of first polarizing plate
The polyvinyl alcohol film was stretched 3 times at 60 ° C, adsorbed to iodine, and then 2.5 times stretched in an aqueous boric acid solution at 40 ° 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.
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 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 (
(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.,
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 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 (
(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.,
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.
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 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 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.
(%)
* 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 (19)
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,
Wherein a ratio (P3 / C) of a maximum width (P3) of the engraved pattern to a period (C) of the high refractive index pattern layer is more than 0 and 0.5 or less.
A structure in which the polarizer, the low refractive index pattern layer, the high refractive index pattern layer formed directly on the low refractive index pattern layer, and the second protective layer are sequentially laminated on the high refractive index pattern layer; or
A structure in which the polarizer, the second protective layer formed on the polarizer, the low refractive index pattern layer formed on the second protective layer, and the high refractive index pattern layer formed directly on the low refractive index pattern layer are sequentially stacked And a liquid crystal display module.
Wherein one surface of the second protective layer or the high refractive index pattern layer is formed to be a functional layer.
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.
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.
Priority Applications (4)
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US14/983,060 US10268063B2 (en) | 2014-12-31 | 2015-12-29 | Liquid crystal display module with lenticular lens pattern and liquid crystal display comprising the same |
JP2015257669A JP6159385B2 (en) | 2014-12-31 | 2015-12-29 | Module for liquid crystal display device and liquid crystal display device including the same |
CN201511020491.7A CN105739163B (en) | 2014-12-31 | 2015-12-30 | Liquid crystal display module and liquid crystal display including the same |
TW104144377A TWI649602B (en) | 2014-12-31 | 2015-12-30 | Liquid crystal display module and liquid crystal display comprising the same |
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KR1020140196078 | 2014-12-31 | ||
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KR1020140196078 | 2014-12-31 |
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KR1020150154143A KR101640719B1 (en) | 2014-12-31 | 2015-11-03 | Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same |
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KR20200096156A (en) * | 2019-02-01 | 2020-08-11 | 신화인터텍 주식회사 | Optical sheet and method for fabricating the optical sheet |
KR20200108750A (en) | 2019-03-11 | 2020-09-21 | 동우 화인켐 주식회사 | Diffusion film laminate and liquid crystal device including the same |
US11131874B2 (en) | 2019-05-31 | 2021-09-28 | Samsung Display Co., Ltd. | Optical film and display device including the same |
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KR102040298B1 (en) | 2017-02-21 | 2019-11-04 | 삼성에스디아이 주식회사 | Optical film for improving contrast ratio, polarizing plate comprising the same and liquid crystal display apparatus comprising the same |
KR102237004B1 (en) * | 2017-08-28 | 2021-04-07 | 삼성에스디아이 주식회사 | Optical film for improving contrast ratio, polarizing plate comprising the same and liquid crystal display apparatus comprising the same |
TWI696872B (en) | 2018-02-28 | 2020-06-21 | 南韓商Lg化學股份有限公司 | Viewing angle compensation film, polarizing plate comprising the same, and display device comprising the same |
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Also Published As
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KR20160081783A (en) | 2016-07-08 |
TWI649602B (en) | 2019-02-01 |
KR101640719B1 (en) | 2016-07-18 |
TW201624074A (en) | 2016-07-01 |
TW201624075A (en) | 2016-07-01 |
KR20160081784A (en) | 2016-07-08 |
TWI574083B (en) | 2017-03-11 |
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