KR20130035537A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20130035537A
KR20130035537A KR1020110099887A KR20110099887A KR20130035537A KR 20130035537 A KR20130035537 A KR 20130035537A KR 1020110099887 A KR1020110099887 A KR 1020110099887A KR 20110099887 A KR20110099887 A KR 20110099887A KR 20130035537 A KR20130035537 A KR 20130035537A
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KR
South Korea
Prior art keywords
diffusion
light
base layer
light collecting
liquid crystal
Prior art date
Application number
KR1020110099887A
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Korean (ko)
Inventor
문창열
김병구
정용훈
김진련
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110099887A priority Critical patent/KR20130035537A/en
Publication of KR20130035537A publication Critical patent/KR20130035537A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Abstract

PURPOSE: A liquid crystal display is provided to improve brightness by using a diffusion sheet including a resin layer. CONSTITUTION: A second diffusion sheet(240) is laminated on a first diffusion sheet. The second diffusion sheet includes a second diffusion base layer(241), a resin layer(242), and a second lower coating layer(243). The resin layer has an embossing pattern.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device capable of satisfying the LR value and TB value of the TCO standard while improving the luminance.

In line with the recent information age, the display field has also been rapidly developed, and in response to this, a flat panel display device (FPD) having advantages of thinning, light weight, and low power consumption is a liquid crystal display using an electric field. An image is displayed by adjusting the light transmittance of the liquid crystal having anisotropy. To this end, the liquid crystal display includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix, a driving circuit for driving the liquid crystal panel, and a backlight unit for irradiating light to the liquid crystal panel.

The backlight unit is classified into a direct type method for irradiating light to the front surface of the liquid crystal panel and an edge type method for irradiating light to the side surface of the liquid crystal panel according to the position of the light source.

Such a backlight unit includes optical sheets for improving the optical properties of the light emitted from the light source. The optical sheets include at least one diffusion sheet for diffusing light, a prism sheet for condensing the diffused light in the front direction, and the like.

The liquid crystal display having the above configuration must satisfy the Luminance uniformity-angular dependence condition of the swedish confederation of professional employees (TCO) standard. The Luminance uniformity-angular dependence condition of the TCO standard means a requirement that the ratio of the luminance at both edges is preferably 1.73 or less when observing the luminance of the edge region of the liquid crystal panel at a particular viewing angle. Specifically, the Luminance uniformity-angular dependence condition of the TCO standard means that the LR value (ratio of luminance at left and right) and TB value (ratio of luminance at top and bottom) are preferably 1.73 or less.

A conventional liquid crystal display device combines at least two or more sheets of three optical sheets consisting of a diffusion sheet, a light collecting sheet, a reflective polarizing sheet, and a composite light collecting sheet in order to satisfy the LR and TB value conditions of the TCO standard. use.

By the way, since the conventional liquid crystal display device uses an expensive reflective polarizing sheet, manufacturing cost is raising. Accordingly, although the reflection type polarizing sheet is omitted in the liquid crystal display device, there is a problem that the LR value and the TB value condition of the TCO standard are not satisfied and the luminance is lowered by omitting the reflection type polarizing sheet.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device capable of satisfying LR values and TB values of the TCO standard while improving luminance.

A liquid crystal display device according to an embodiment of the present invention for achieving the above object is a liquid crystal panel for displaying an image; And at least one light emitting diode disposed under the liquid crystal panel and emitting light, a light guide plate disposed on the side of the light emitting diode, and a first diffusion sheet, a second diffusion sheet, and a light condenser disposed on the light guide plate in order. A backlight unit comprising a sheet, wherein the second diffusion sheet comprises: a diffusion base layer; A resin layer disposed on the diffusion base layer and formed of an embossing pattern in which each of the plurality of recesses and each of the plurality of convex portions are alternately disposed; And a lower coating layer disposed below the diffusion base layer and including a diffusion bead and a diffusion binder, wherein the embossing pattern is disposed to be 24 ° to 40 ° with respect to one side of the diffusion base layer. .

The resin layer has a refractive index of between 1.53 and 1.57, and the lower coating layer may have a haze of 5% to 15%.

The radius of curvature of the convex portion may be 4R to 6R, the pitch between adjacent concave portions of the plurality of concave portions may be 20 μm to 30 μm, and the height of the convex portion may be 3 μm to 17 μm.

The diffusion beads may be monodisperse beads having a refractive index of between 1.45 and 1.50, and the diffusion binder may have a refractive index of between 1.45 and 1.50.

The diffusion base layer may have a thickness of 125 μm.

The light collecting sheet may include a light collecting base layer; A plurality of prisms disposed on the light collecting base layer; And a light collecting coating layer disposed under the light collecting base layer and including a light collecting bead and a light collecting binder.

The plurality of prisms may have a refractive index of 1.56 to 1.565.

The light collecting coating layer may have a haze of 10% to 15%.

The light collecting base layer may have a light transmittance of 95% or more.

The condensing base layer may have a thickness of 250 μm.

The liquid crystal display according to the exemplary embodiment of the present invention includes a diffusion sheet including a resin layer formed of an embossed pattern disposed to be 24 ° to 40 ° tilted with respect to one side of the diffusion base layer, thereby improving brightness while simultaneously improving TCO standard. It is possible to satisfy the LR value and TB value of.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.
FIG. 2 is a cross sectional view of the LCD shown in FIG. 1.
3 is a detailed cross-sectional view of the first diffusion sheet illustrated in FIG. 2.
4 is a detailed cross-sectional view of the second diffusion sheet illustrated in FIG. 2.
5 is a detailed cross-sectional view of the light collecting sheet shown in FIG. 2.
6A and 6B are photographs showing the presence or absence of wrinkles according to the thickness of the light collecting base layer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a combined cross-sectional view of the liquid crystal display shown in FIG. 1.

1 and 2, the liquid crystal display device 10 according to an exemplary embodiment of the present invention includes a liquid crystal panel 100 for displaying an image and a backlight unit 200 for irradiating light onto the liquid crystal panel 100. And a support main 270 supporting the liquid crystal panel 100 and accommodating the backlight unit 200, a cover bottom 280 coupled to the back of the support main 270, and a front surface of the liquid crystal panel 100. The top cover 290 is fastened to the cover bottom 280 by surrounding the edge.

The liquid crystal panel 100 includes an upper substrate 110 and a lower substrate 120 that face each other. The liquid crystal panel 100 includes a liquid crystal layer (not shown) formed between the upper substrate 110 and the lower substrate 120.

The upper substrate 110 includes a color filter, a common electrode, a black matrix, and the like. The common electrode may be formed on the lower substrate 120 according to the liquid crystal driving method of the liquid crystal panel 100.

The lower substrate 120 includes signal lines such as data lines and gate lines that cross each other, and includes a thin film transistor formed at an intersection of the data line and the gate line. The thin film transistor supplies an image signal provided from a data line to a pixel electrode in response to a scan pulse provided from a gate line. The lower substrate 120 is connected to a plurality of driving integrated circuits for driving gate lines and data lines. The plurality of driving integrated circuits are mounted in a tape carrier package (TCP) 130 and connected to the lower substrate 120 by a tape automated bonding (TAB) method. In addition, the plurality of driving integrated circuits mounted on the TCP 130 are connected to a printed circuit board (PCB) 140 on which a timing controller and a power supply unit are mounted.

The backlight unit 200 includes a light source unit 210, a light guide plate 220 of a transparent material disposed on the side of the light source unit 210, and a first diffusion sheet 230 and a second light source that are sequentially stacked on the light guide plate 220. The diffusion sheet 240, the light collecting sheet 250, and the reflective plate 260 disposed on the rear surface of the light guide plate 220 are included.

The light source unit 210 is disposed on at least one side of the liquid crystal panel 100 in an edge manner to generate light, and outputs light to the incident surface 221 of the light guide plate 220. The light source unit 210 includes at least one light emitting diode (LED) 211 for generating light, and a light source printed circuit board (PCB) 212 for driving the LED 211.

The light guide plate 220 passes the light emitted from the light source unit 210 to the incident surface 221 toward the liquid crystal panel 100. The light guide plate 220 may be formed of a material having good refractive index and high transmittance and may be formed of, for example, polymethymethacrylate (PMMA), polyethylene (PC), polyethylene (PE), or the like.

The first diffusion sheet 230 and the second diffusion sheet 240 diffuse light emitted from the light guide plate 220 to the front side, and the light collecting sheet 250 collects light diffused from the second diffusion sheet 240. To the liquid crystal panel 100. The first diffusion sheet 230, the second diffusion sheet 240, and the light condensing sheet 250 convert the traveling path of the light emitted from the light guide plate 220 to be perpendicular to the liquid crystal panel 100 to convert the liquid crystal panel 100 into a liquid crystal panel 100. It improves the efficiency of the light irradiated.

The reflection plate 260 reflects light emitted in a downward direction of the light guide plate 220 toward the liquid crystal panel 100. The support main 270 is mounted on the cover bottom 280 to support the liquid crystal panel 100. To this end, the support main 270 includes a step 271 for supporting the liquid crystal panel 100.

The cover bottom 280 is made of a metal material and includes a flat portion and a side portion that are bent to surround the side and rear surfaces of the support main 270. The cover bottom 280 discharges heat generated when the backlight unit 200 is driven to the outside.

Hereinafter, the first diffusion sheet 230, the second diffusion sheet 240, and the light collecting sheet 250 will be described in detail.

3 is a detailed cross-sectional view of the first diffusion sheet illustrated in FIG. 2, and FIG. 4 is a detailed cross-sectional view of the second diffusion sheet illustrated in FIG. 2. FIG. 5 is a detailed cross-sectional view of the light collecting sheet shown in FIG. 2, and FIGS. 6A and 6B are photographs showing the presence or absence of wrinkles according to the thickness of the light collecting base layer.

Referring to FIG. 3, the first diffusion sheet 230 is disposed adjacent to the light guide plate 220 to primarily diffuse light emitted from the light guide plate 220 to the front. The first diffusion sheet 230 specifically includes a first diffusion base layer 231, a first upper coating layer 232, and a first lower coating layer 233.

The first diffusion base layer 231 is a material excellent in light transmittance, heat resistance, fire resistance and mechanical strength, such as polyethylene, polymethylmethacrylate, polyamide, polyimide (Polyimide), polypropylene (Polypropylene), polyurethane (polyurethane) and polyethylene terephthalate (Polyethylene terephthalate), polycarbonate (Polycarbonate), polystyrene (Polystyrene) and polyepoxy (Polyepoxy) and the like can be formed.

The first top coating layer 232 includes a first top diffusion bead 232a and a first top diffusion binder 232b. The first upper diffusion beads 232a may be polydisperse beads, for example, polymethyl methacrylate, polybutylmethacrylate, or the like. The first upper diffusion binder 232b may be, for example, an acrylic resin.

The first lower coating layer 233 includes a first lower diffusion bead 233a and a first lower diffusion binder 233b. The first lower diffusion beads 233a may be monodisperse beads, and may be formed of, for example, polymethyl methacrylate, polybutylmethacrylate, or the like. The first lower diffusion binder 233b may be, for example, an acrylic resin.

Referring to FIG. 4, the second diffusion sheet 240 is stacked on the first diffusion sheet 250 to secondarily diffuse the light emitted from the light guide plate 220 to the front side. The second diffusion sheet 240 satisfies the LR value (ratio of luminance at left and right) and the TB value (ratio of luminance at top and bottom) of the TCO standard while increasing the luminance of the liquid crystal panel 100. It is configured to. To this end, the second diffusion sheet 240 includes a second diffusion base layer 241, a resin layer 242, and a second lower coating layer 243.

In detail, the second diffusion base layer 241 is formed of the same material as the first diffusion base layer 231 and has a thickness of 125 μm.

The resin layer 242 is disposed on the second diffusion base layer 241, and is formed in an embossing pattern in which each of the plurality of recesses CC and each of the plurality of convex portions CV are alternately disposed. The resin layer 242 may increase the diffusion efficiency at the same time while improving the brightness of the light provided from the first diffusion sheet 230 as compared with the case where the conventional bead including a bead. Here, the resin layer 242 is formed such that the embossed pattern is disposed to be tilted at 24 ° to 40 ° with respect to one side of the second diffusion base layer 241. This is because the LR value and the TB value of the TCO standard are satisfied when the embossing pattern is arranged to be tilted at 24 ° to 40 ° with respect to one side of the second diffusion base layer 241 from the experimental results of Table 1 below. Here, LR value and TB value should be 1.73 or less. In Table 1 below, NG means that the TCO standard is not satisfied, and OK means that the TCO standard is satisfied.

Tilt angle 20 ° 24 ° 28 ° 32 ° 36 ° 40 ° 45 °

Figure pat00001
Figure pat00002
Figure pat00003
Figure pat00004
Figure pat00005
Figure pat00006
Figure pat00007
 LR measurement 1.74 (NG) 1.73 (OK) 1.72 (OK) 1.69 (OK) 1.70 (OK) 1.70 (OK) 1.76 (NG) TB measure 1.50 (OK) 1.51 (OK) 1.52 (OK) 1.52 (OK) 1.53 (OK) 1.53 (OK) 1.53 (OK)

In addition, the resin layer 242 is formed of a resin having a refractive index of between 1.53 and 1.57. The resin layer 242 may be formed of, for example, acrylic resin. In addition, the resin layer 242 has a radius of curvature of the convex portion CV of 4R to 6R, a pitch P between adjacent concave portions of the plurality of concave portions CC, and has a convex portion of 20 μm to 30 μm. The height H of the CV is formed to be 3 µm to 17 µm.

The second lower coating layer 243 has a haze of 5% to 15%, and includes a second lower diffusion bead 243a and a second lower diffusion binder 243b. The second lower diffusion beads 243a are monodisperse beads having a refractive index between 1.45 and 1.50, and may be formed of, for example, polymethylmehtacrylate, polybutylmethacrylate, or the like. The second lower diffusion binder 243b is a binder having a refractive index between 1.45 and 1.50, and may be, for example, an acrylic resin.

Referring to FIG. 5, the light collecting sheet 250 is stacked on the second diffusion sheet 240 and is configured to satisfy the LR and TB values of the TCO standard while increasing the luminance of the liquid crystal panel 100. To this end, the light collecting sheet 250 includes a light collecting base layer 251, a plurality of prisms 252, and a light collecting coating layer 253.

Specifically, the light collecting base layer 251 is formed of a material having a light transmittance of 95% or more, for example, polyethylene terephthalate having a light transmittance of 95% or more. When the condensing base layer 251 is formed of less than 95% of polyethylene terephthalate, light scattering is large and thus light loss is also large. In this case, the luminance of the backlight unit and the luminance of the liquid crystal panel are lowered. This can be seen through the experimental results of Table 2 below.

In the case of the light collecting sheet to which the light collecting base layer having the light transmittance of 95% or more is applied In the case of the light collecting sheet to which the light collecting base layer has a light transmittance of less than 95%, Backlight Unit Luminance 111.2% 111.4% Luminance of liquid crystal panel 110.9% 106.9%

Table 2 shows that the light collecting sheet to which the light collecting base layer having a light transmittance of 95% or more is applied has a luminance reduced by 0.3% from the brightness of the backlight unit, but has a light transmittance base of less than 95%. In the case of the light collecting sheet to which the layer was applied, the luminance of the liquid crystal panel was reduced by 4.5% from the luminance of the backlight unit. From this, it can be seen that the light scattering sheet and the light loss are large in the case of the light collecting sheet to which the light collecting base layer having the light transmittance of less than 95% is applied, and as a result, the final luminance of the liquid crystal display is also lowered.

In addition, the light collecting base layer 251 has a thickness of 250 μm. This is set by the experimental results of FIGS. 6A and 6B. 6A is a photograph when the light collecting base layer has a thickness of 188 µm, and wrinkles (red line portion) are generated in the light collecting base layer at a high temperature of 50 ° C. On the other hand, Figure 6b is a photograph when the light collecting base layer has a thickness of 250㎛, no wrinkles occurred in the light collecting base layer at a high temperature of 50 ℃.

The plurality of prisms 252 is formed in a triangular pillar shape on the upper surface of the light collecting base layer 21. The plurality of prisms 252 may be formed of a resin having a refractive index of 1.56 to 1.565. This is because the luminance is improved when the plurality of prisms 252 formed of a resin having a refractive index of 1.56 to 1.565 is applied from the experimental results of Table 3 below.

The light collecting coating layer 253 includes a light collecting bead 253a and a light collecting binder 253b. The condensing beads 253a are monodisperse beads, and may be formed of, for example, polymethylmehtacrylate, polybutylmethacrylate, or the like. The light collecting binder 253b may be, for example, an acrylic resin. The light collecting coating layer 253 has a haze of 10% to 15%. Here, if the haze of the light collecting coating layer 253 is less than 10%, spectral muras are generated. When the haze of the light collecting coating layer 253 exceeds 15%, the luminance is lowered. This can be seen through the experimental results in Table 3 below.

Condensing sheet Conventional light collecting sheet Condensing sheet of the present invention Refractive index of multiple prisms 1.55 1.565 Haze of Condensing Coating Layer 25% 10% 15% Luminance 100% 104.9% 102.6%

As described above, the liquid crystal display 100 according to the exemplary embodiment of the present invention includes a resin layer 242 formed of an embossed pattern disposed to be tilted 24 ° to 40 ° with respect to one side of the second diffusion base layer 241. By providing the second diffusion sheet 240, the luminance can be improved while simultaneously satisfying the LR value and the TB value of the TCO standard.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will understand that various modifications and equivalent arrangements may be made therein It will be possible.

10: liquid crystal display device 100: liquid crystal panel
200: backlight unit 210: light source unit
220: Light guide plate 230: First diffusion sheet
231: first diffusion base layer 232: first top coating layer
233: first lower coating layer 240: second diffusion sheet
241: second diffusion base layer 242: resin layer
234: second lower coating layer 250: light collecting sheet
251: light collecting base layer 252: multiple prisms
253: light collecting coating layer 260: reflector
270: support main 280: cover bottom
290: top cover

Claims (10)

A liquid crystal panel for displaying an image; And
At least one light emitting diode disposed under the liquid crystal panel and emitting light, a light guide plate disposed on the side of the light emitting diode, and a first diffusion sheet, a second diffusion sheet, and a light collecting sheet sequentially disposed on the light guide plate. Having a backlight unit including a,
The second diffusion sheet is
A diffusion base layer;
A resin layer disposed on the diffusion base layer and formed of an embossing pattern in which each of the plurality of recesses and each of the plurality of convex portions are alternately disposed; And
A lower coating layer disposed under the diffusion base layer, the diffusion coating including diffusion beads and a diffusion binder;
And the embossing pattern is disposed to be 24 ° to 40 ° with respect to one side of the diffusion base layer. The method of claim 1,
The resin layer has a refractive index of between 1.53 and 1.57,
The lower coating layer has a haze of 5% to 15%. The method of claim 1,
The radius of curvature of the convex portion is 4R to 6R,
The pitch between adjacent recesses of the plurality of recesses is 20㎛ to 30㎛,
The convex portion has a height of 3 μm to 17 μm. The method of claim 1,
The diffusion beads are monodisperse beads having a refractive index between 1.45 and 1.50,
The diffusion binder has a refractive index of between 1.45 and 1.50. The method of claim 1,
The diffusion base layer has a thickness of 125㎛. The method of claim 1,
The light collecting sheet
A light collecting base layer;
A plurality of prisms disposed on the light collecting base layer; And
And a light collecting coating layer disposed under the light collecting base layer, the light collecting coating layer including a light collecting bead and a light collecting binder. The method according to claim 6,
The plurality of prisms have a refractive index of 1.56 to 1.565. The method according to claim 6,
The light collecting coating layer has a haze of 10% to 15%. The method according to claim 6,
The light collecting base layer has a light transmittance of 95% or more. The method according to claim 6,
The light converging base layer has a thickness of 250 μm.
KR1020110099887A 2011-09-30 2011-09-30 Liquid crystal display device KR20130035537A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014209032A1 (en) * 2013-06-28 2014-12-31 코오롱인더스트리 주식회사 Optical member and backlight unit comprising same
KR20210034914A (en) * 2019-09-23 2021-03-31 주식회사 엘엠에스 Optical film for fingerprinting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014209032A1 (en) * 2013-06-28 2014-12-31 코오롱인더스트리 주식회사 Optical member and backlight unit comprising same
KR20210034914A (en) * 2019-09-23 2021-03-31 주식회사 엘엠에스 Optical film for fingerprinting
WO2021060708A1 (en) * 2019-09-23 2021-04-01 주식회사 엘엠에스 Optical film for fingerprint recognition

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