KR20110136645A - Backlight unit and liquid crystal display device having the same - Google Patents

Backlight unit and liquid crystal display device having the same Download PDF

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Publication number
KR20110136645A
KR20110136645A KR1020100056782A KR20100056782A KR20110136645A KR 20110136645 A KR20110136645 A KR 20110136645A KR 1020100056782 A KR1020100056782 A KR 1020100056782A KR 20100056782 A KR20100056782 A KR 20100056782A KR 20110136645 A KR20110136645 A KR 20110136645A
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KR
South Korea
Prior art keywords
optical sheet
light
backlight unit
liquid crystal
beads
Prior art date
Application number
KR1020100056782A
Other languages
Korean (ko)
Inventor
정용훈
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to KR1020100056782A priority Critical patent/KR20110136645A/en
Publication of KR20110136645A publication Critical patent/KR20110136645A/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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • 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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • 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
    • G02B6/0051—Diffusing 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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

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

Abstract

The present invention discloses a backlight unit and a liquid crystal display device. The disclosed backlight unit includes a light source for generating light; In the backlight unit having a first optical sheet and a second optical sheet for condensing and diffusing the light source, the first optical sheet has a plurality of prism patterns formed on the front surface, a plurality of diffusion beads and a binder is mixed on the back And a first light diffusing layer, wherein the second optical sheet has a second light diffusing layer in which a plurality of diffusion beads, an adhesive bead, and a binder are mixed on a front surface thereof.
The backlight unit of the present invention has the effect of improving the light diffusion characteristics while reducing the number of optical sheets by integrating the functions of a plurality of optical sheets in two optical sheets.

Description

Backlight unit and liquid crystal display device having the same {Backlight Unit and Liquid Crystal Display Device having the same}

The present invention relates to a backlight unit of a liquid crystal display device.

Liquid crystal display is a flat panel display that displays images using liquid crystal. It is thin, light, and has low power consumption compared to other display devices. It is used.

Such a liquid crystal display device includes a liquid crystal display panel for displaying an image and a backlight unit for supplying light to the liquid crystal display panel.

The liquid crystal display is classified into an edge type and a direct type according to the shape of the light source. The edge type backlight unit includes a light guide plate on a rear surface of the liquid crystal display panel, and a light source is disposed at a side of the light guide plate to supply a surface light source to the liquid crystal display panel. The direct type backlight unit is applied to a large liquid crystal display device of 12 inches or more, and arranges a plurality of light sources on a rear surface of the liquid crystal display panel, and supplies light emitted from the plurality of light sources to the front liquid crystal display panel.

As the light source of the backlight unit, EL (Electro Luminescence), CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), and a light emitting diode (LED) are used. Recently, a light emitting diode having excellent light efficiency and high color reproducibility has been used as a light source of a backlight unit. The light source may be a package light source consisting of red, green, and blue light emitting diodes, or a white light emitting diode light source.

Recently, a plurality of light emitting diodes are used as a light source for a backlight unit of a liquid crystal display, and in order to meet the luminance conditions of the liquid crystal display, the number of light emitting diodes may be increased or several optical sheets having excellent light diffusing characteristics may be used. ~ 5 sheets) should be used.

However, if the number of light emitting diodes is increased or the number of optical sheets is increased, manufacturing costs may increase. In addition, when the number of optical sheets is increased to improve the luminance characteristics of the backlight unit, a problem arises in that the thickness of the liquid crystal display is increased.

Therefore, the liquid crystal display device requires a technology that can meet the required luminance conditions while reducing the manufacturing cost by reducing the number of light emitting diodes and the number of optical sheets.

The present invention is to provide a backlight unit and a liquid crystal display device by improving the light diffusion characteristics while reducing the number of optical sheets by integrating the functions of a plurality of optical sheets in two optical sheets.

The backlight unit of the present invention for solving the above problems, the light source for generating light; In the backlight unit having a first optical sheet and a second optical sheet for condensing and diffusing the light source, the first optical sheet has a plurality of prism patterns formed on the front surface, a plurality of diffusion beads and a binder is mixed on the back And a first light diffusing layer, wherein the second optical sheet has a second light diffusing layer in which a plurality of diffusion beads, an adhesive bead, and a binder are mixed on a front surface thereof.

In addition, a liquid crystal display device according to another embodiment of the present invention, a liquid crystal display panel; And

And a backlight unit for supplying light to the liquid crystal display panel, wherein the backlight unit includes a light source for generating light, a first optical sheet and a second optical sheet for collecting and diffusing the light source, and the first optical sheet. In the optical sheet, a plurality of prism patterns are formed on the front surface, and a first light diffusion layer in which a plurality of diffusion beads and a binder are mixed is formed on the rear surface, and the second optical sheet has a plurality of diffusion beads, adhesive beads, and binders on the front surface. The mixed second light diffusion layer is formed.

The backlight unit of the present invention has the effect of improving the light diffusion characteristics while reducing the number of optical sheets by integrating the functions of a plurality of optical sheets in two optical sheets.

In addition, the present invention reduces the manufacturing cost of the backlight unit and the liquid crystal display device by reducing the optical sheet used in the backlight unit, there is an effect that can be made thin.

In addition, the optical sheets of the backlight unit of the present invention has the effect of improving the brightness and contrast ratio characteristics by allowing a plurality of light diffusion, light refraction and light scattering in the two optical sheets.

1 is an exploded perspective view illustrating a liquid crystal display according to the present invention.
FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.
3 and 4 illustrate the structures of the first optical sheet and the second optical sheet of the present invention.
5 is a view illustrating a state in which the first optical sheet and the second optical sheet of the present invention are attached to each other.
6 is a chart comparing the optical characteristics when using the conventional three-sheet optical sheet and when using the two-sheet optical sheet of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the invention is not limited to the embodiments described below and may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view illustrating a liquid crystal display according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

1 and 2, the liquid crystal display of the present invention includes a liquid crystal display panel 110 and a backlight unit 120 for providing a surface light source to the liquid crystal display panel 110.

The liquid crystal display panel 110 includes an upper substrate 110a including red and green (RGB) color filter layers, and a lower substrate 110b including a thin film transistor (TFT) and a pixel electrode interposed therebetween. It is structured to be put together.

A gate driving circuit (not shown) for supplying a scan signal to a gate line and a data driving circuit (not shown) for supplying a data signal to a data line are provided at an edge of the liquid crystal display panel 110.

The gate and data driving circuit are electrically connected to the liquid crystal display panel 110 by a chip on film (COF). Here, the COF may be changed to a tape carrier package (TCP).

In addition, the backlight unit 120 includes an LED chip 150 composed of red (R), green (G), and blue (B) light emitting diodes (LEDs) or white (W) light emitting diodes (LEDs) (hereinafter, LED). Chip), a printed circuit board 151 in which a plurality of power patterns are formed to supply power to the LED chip 150, and a light guide plate for converting a light source supplied from the LED chip 150 into a surface light source. 140, a reflection plate 180 disposed on a rear surface of the light guide plate 140 to improve light efficiency, and first and second optical sheets disposed at a front side (upper side) of the light guide plate 180 to collect and diffuse light. 131 and 132, a lower cover 190 for storing the LED chip 150, the printed circuit board 151, the light guide plate 140, the reflecting plate 180, and the first and second optical sheets 131 and 132. It includes.

The liquid crystal display panel 110 and the backlight unit 120 are integrally coupled while the support main 115 and the lower cover 190 are assembled.

In the present invention, in order to manufacture a liquid crystal display device thin, the optical sheet is composed of only two.

Here, the first optical sheet 131 functions as a prism sheet for condensing the surface light source supplied from the light guide plate 140, and the second optical sheet 132 is combined with the first optical sheet 131 to guide the light guide plate 140. ) And diffuses the surface light source supplied from.

3 and 4 are views showing the structure of the first optical sheet and the second optical sheet of the present invention, Figure 5 is a view showing a state in which the first optical sheet and the second optical sheet of the present invention is attached to each other. to be.

3 and 4, a plurality of prism patterns are formed on the front surface of the first optical sheet 131, and a binder 125 is coated on the back surface of the first optical sheet 131, and a plurality of diffusion beads are formed on the binder 125. bead 133 is mixed. The prism pattern formed on the front surface of the first optical sheet 131 has an isosceles triangular cross section having a refractive index of 1.56 to 1.59, a vertex angle of 90 °, and a pitch of 50 μm. The diffusion beads 133 and the binder 125 serve as a first light diffusion layer having a light diffusion function.

The diffusion bead 133 has a diameter of 2 ~ 5㎛, the material is acrylic resin, acrylic polymer, CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium Phospate, TiO2, SiO2, CaCo3, SnO2, Scattering agents of Mb 2 O 5, ZnO 2, MgF 2, CeO 2, Al 2 O 3, HfO 2, Na 3 LaF 6 and LaF 6 can be used.

In addition, the diffusion beads 133 and the adhesion beads 145 formed on the first optical sheet 131 are mixed with the binder 125 and coated on the front surface of the second optical sheet 132. The diffusion bead 133, the adhesive bead 145, and the binder 125 serve as a second light diffusion layer.

The diameter of the adhesive bead 145 is preferably larger than the diameter of the diffusion bead 133. The diameter is about 30-50 micrometers.

In addition, the mixing ratio of the diffusion bead 133 and the adhesive bead 145 mixed in the binder 125 of the second optical sheet 132 is preferably 3: 1.

In addition, the thickness of the binder 125 formed on the first optical sheet 131 and the second optical sheet 132 is preferably smaller than the diameter of the adhesive bead 145. As for the diameter, about 10-15 micrometers is preferable. This is to form an air layer between the first optical sheet 131 and the second optical sheet 132 when the first optical sheet 131 and the second optical sheet 132 are attached to each other.

The adhesive beads 145 may be made of acrylic resin, acrylic polymer, CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium phosphate, TiO 2, SiO 2, CaCo 3, SnO 2, Mb 2 O 5, ZnO 2, MgF 2, CeO 2, Al 2 O 3, HfO 2, Any of the scattering agents of Na 3 LaF 6 and LaF 6 can be used.

In addition, the cross section of the adhesive bead 145 may be formed in any one of a circular, elliptical, star, square, octagonal, cylindrical and trapezoidal.

In addition, the adhesive layer 200 is formed on the upper surface of the adhesive bead 145 formed on the second optical sheet 132 to be attached to the first optical sheet 131. It is preferable that the thickness of the contact bonding layer 200 is 5 micrometers or less.

When the adhesive layer 200 is formed on the second optical sheet 132 as described above, as shown in FIG. 5, the first optical sheet 131 and the second optical sheet 132 are laminated in a lamination manner. Sheets are attached.

Accordingly, the first optical sheet 131 and the second optical sheet 132 of the present invention have a structure in which two optical sheets are attached, but have substantially a plurality of light diffusion layers.

That is, the first light diffusing layer formed of the diffusion beads 133 on the back surface of the first optical sheet 131 and the binder 125, the diffusion beads 133 on the front surface of the second optical sheet 132, and the adhesive beads 145. And a second light diffusion layer formed of the binder 125, and air layers formed between the first light diffusion layer and the second light diffusion layer.

In the second optical sheet 132, diffusion beads 133 and adhesive beads 145 having different diameters are mixed to serve to primarily diffuse the surface light source traveling in the light guide plate.

The light diffused from the diffusion bead 133 and the adhesive bead 145 formed on the second optical sheet 132 does not immediately proceed to the first optical sheet 131, but passes through the air layer, and then the first The light is diffused while passing through the diffusion bead 133 and the binder 125 formed on the rear surface of the optical sheet 131.

That is, the light sources passing through different media perform a plurality of diffusion, refraction, and scattering actions, and are then focused in the prism pattern of the first optical sheet 131.

Therefore, as in the prior art, although the thickness (formerly three sheets: 460 µm-> 2 sheets of the present invention: 250 µm) is smaller than the structure in which the diffusion sheets are arranged on both sides between the prism optical sheets, the light diffusion step is almost similar. Thus, the luminance characteristics are almost the same.

Therefore, although two optical sheets are used in the present invention, the same luminance characteristics as those using three or more optical sheets can be realized. As a result, manufacturing costs of the liquid crystal display and the backlight unit can be reduced, and thickness can be realized.

6 is a chart comparing the optical characteristics when using the conventional three-sheet optical sheet and when using the two-sheet optical sheet of the present invention.

Referring to Fig. 6, in the three-layer structure of the conventional diffusion sheet, prism sheet and diffusion sheet, the luminance characteristic of the central region is 100%, and the luminance characteristic of the central region of the two-structure structure of the present invention is 99%.

In addition, it can be seen that the luminance uniformity and the contrast ratio CR are similar to those of the conventional three-sheet structure and the present invention. In particular, in the present invention, it can be seen that the vertical viewing angle and the horizontal viewing angle characteristics are wider than the conventional three-sheet structure.

In particular, although two optical sheets are used in the present invention, it can be seen that defects in the diffuse pattern (FOS) formed on the light guide plate do not look the same as the conventional three-sheet structure.

As described above, the optical sheet structure of the present invention uses less optical sheets than the prior art, but has an advantage of realizing almost the same luminance and contrast ratio.

110: liquid crystal display panel 120: backlight unit
115: support main 150: LED chip
151: printed circuit board 131: first optical sheet
132: second optical sheet 125: binder
133: diffusion beads 145: adhesive beads
200: adhesive layer

Claims (14)

A light source for generating light; And
In the backlight unit having a first optical sheet and a second optical sheet for condensing and diffusing the light source,
The first optical sheet has a plurality of prism patterns formed on the front surface, and a first light diffusion layer in which a plurality of diffusion beads and a binder are mixed on the rear surface thereof,
And the second optical sheet has a second light diffusion layer in which a plurality of diffusion beads, an adhesive bead, and a binder are mixed on a front surface thereof.
The method of claim 1, wherein the backlight unit,
A light guide plate for converting light generated from the light source into a surface light source;
And a reflector disposed on a rear surface of the light guide plate.
The method of claim 1, wherein the diffusion beads and adhesive beads are acrylic resin, acrylic polymer, CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium Phospate, TiO 2, SiO 2, CaCo 3, SnO 2, Mb 2 O 5, ZnO 2, MgF 2, CeO 2, A backlight unit, characterized in that formed of any one of Al2O3, HfO2, Na3LaF6 and LaF6.
The backlight unit of claim 1, wherein the diffusion beads have a diameter of about 2 μm to about 5 μm.
The backlight unit of claim 1, wherein the adhesive beads have a diameter of 30 μm to 50 μm.
The backlight unit of claim 1, wherein the ratio of the diffusion beads to the adhesion beads of the second optical sheet is 3: 1.
The backlight unit of claim 1, wherein an air layer is formed between the first light diffusion layer of the first optical sheet and the second light diffusion layer of the second optical sheet.
A liquid crystal display panel; And
It includes a backlight unit for supplying light to the liquid crystal display panel,
The backlight unit,
A light source for generating light,
A first optical sheet and a second optical sheet for collecting and diffusing the light source;
The first optical sheet has a plurality of prism patterns formed on the front surface, a first light diffusion layer in which a plurality of diffusion beads and a binder is mixed on the back surface is formed,
And a second light diffusion layer having a plurality of diffusion beads, an adhesive bead, and a binder mixed on a front surface of the second optical sheet.
The method of claim 8, wherein the backlight unit,
A light guide plate for converting light generated from the light source into a surface light source;
And a reflector disposed on a rear surface of the light guide plate.
The method of claim 8, wherein the diffusion beads and adhesive beads are acrylic resin, acrylic polymer, CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium Phospate, TiO 2, SiO 2, CaCo 3, SnO 2, Mb 2 O 5, ZnO 2, MgF 2, CeO 2, A liquid crystal display device comprising any one of Al 2 O 3, HfO 2, Na 3 LaF 6, and LaF 6.
The liquid crystal display device according to claim 8, wherein the diffusion beads have a diameter of 2 to 5 µm.
The liquid crystal display device according to claim 8, wherein the adhesive beads have a diameter of 30 to 50 µm.
9. The liquid crystal display device according to claim 8, wherein the ratio of the diffusion bead to the adhesion bead of the second optical sheet is 3: 1.
The liquid crystal display device according to claim 8, wherein an air layer is formed between the first light diffusion layer of the first optical sheet and the second light diffusion layer of the second optical sheet.
KR1020100056782A 2010-06-15 2010-06-15 Backlight unit and liquid crystal display device having the same KR20110136645A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013100234A1 (en) * 2011-12-29 2013-07-04 Lg Innotek Co., Ltd. Lamp device and lcd using the same
KR20150050050A (en) * 2013-10-31 2015-05-08 엘지디스플레이 주식회사 A monolithic optical sheet and liquid crystal display device including the same
KR20160000916A (en) * 2014-06-25 2016-01-06 엘지디스플레이 주식회사 Optical sheet and back light unit comprising optical sheet
KR20160123834A (en) * 2015-04-17 2016-10-26 주식회사 케이에이피에스 Optical sheet and method of manufacturing the same, multi-optical sheet using the optical sheet
KR101868522B1 (en) * 2016-06-27 2018-07-19 주식회사 케이에이피에스 Optical sheet and method of manufacturing the same
KR20180105611A (en) * 2018-09-14 2018-09-28 엘지디스플레이 주식회사 Optical Film And Liquid Crystal Display Comprising The Same
KR20190087314A (en) * 2018-01-15 2019-07-24 케이와 인코포레이티드 Diffusion sheet, backlight unit, and liquid crystal display device
US10481308B2 (en) 2015-11-30 2019-11-19 Lg Display Co., Ltd. Optical film, method for manufacturing optical film, and liquid crystal display including optical film
US10663797B2 (en) 2014-12-12 2020-05-26 Samsung Electronics Co., Ltd. Composite optical sheet, liquid crystal display device using same, and method for manufacturing same
WO2020222358A1 (en) * 2019-04-30 2020-11-05 희성전자 주식회사 Diffusion plate having optical path control function and backlight device
KR102296167B1 (en) * 2020-10-28 2021-09-02 주식회사 상보 Optical film and optical display device comprising the same
KR102296165B1 (en) * 2020-10-28 2021-09-02 주식회사 상보 Optical film and optical display device comprising the same

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013100234A1 (en) * 2011-12-29 2013-07-04 Lg Innotek Co., Ltd. Lamp device and lcd using the same
KR20150050050A (en) * 2013-10-31 2015-05-08 엘지디스플레이 주식회사 A monolithic optical sheet and liquid crystal display device including the same
KR20160000916A (en) * 2014-06-25 2016-01-06 엘지디스플레이 주식회사 Optical sheet and back light unit comprising optical sheet
US10663797B2 (en) 2014-12-12 2020-05-26 Samsung Electronics Co., Ltd. Composite optical sheet, liquid crystal display device using same, and method for manufacturing same
KR20160123834A (en) * 2015-04-17 2016-10-26 주식회사 케이에이피에스 Optical sheet and method of manufacturing the same, multi-optical sheet using the optical sheet
US10481308B2 (en) 2015-11-30 2019-11-19 Lg Display Co., Ltd. Optical film, method for manufacturing optical film, and liquid crystal display including optical film
KR101868522B1 (en) * 2016-06-27 2018-07-19 주식회사 케이에이피에스 Optical sheet and method of manufacturing the same
KR20190087314A (en) * 2018-01-15 2019-07-24 케이와 인코포레이티드 Diffusion sheet, backlight unit, and liquid crystal display device
KR20180105611A (en) * 2018-09-14 2018-09-28 엘지디스플레이 주식회사 Optical Film And Liquid Crystal Display Comprising The Same
WO2020222358A1 (en) * 2019-04-30 2020-11-05 희성전자 주식회사 Diffusion plate having optical path control function and backlight device
KR102296167B1 (en) * 2020-10-28 2021-09-02 주식회사 상보 Optical film and optical display device comprising the same
KR102296165B1 (en) * 2020-10-28 2021-09-02 주식회사 상보 Optical film and optical display device comprising the same

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