KR20120075115A - Light guide plate, backlight unit having the same and liquid crystal display device and method thereof - Google Patents

Light guide plate, backlight unit having the same and liquid crystal display device and method thereof Download PDF

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Publication number
KR20120075115A
KR20120075115A KR1020100137152A KR20100137152A KR20120075115A KR 20120075115 A KR20120075115 A KR 20120075115A KR 1020100137152 A KR1020100137152 A KR 1020100137152A KR 20100137152 A KR20100137152 A KR 20100137152A KR 20120075115 A KR20120075115 A KR 20120075115A
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KR
South Korea
Prior art keywords
light
guide plate
light incident
incident surface
light guide
Prior art date
Application number
KR1020100137152A
Other languages
Korean (ko)
Inventor
곽영재
Original Assignee
엘지디스플레이 주식회사
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Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020100137152A priority Critical patent/KR20120075115A/en
Publication of KR20120075115A publication Critical patent/KR20120075115A/en

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    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/4482—Code or colour marking
    • 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 
    • G02F1/0102—Constructional details, not otherwise provided for in this subclass
    • G02F1/0105—Illuminating devices
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12035—Materials
    • G02B2006/12069—Organic material
    • G02B2006/12071—PMMA

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonlinear Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a liquid crystal display including a light guide plate and a backlight unit having the light guide plate, the disclosed configuration comprising: a light incident surface on which light is incident; A light exit surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and the light incident through the light incident surface to be emitted; A light incident surface facing the light incident surface and having a total reflection sheet; And a back surface to which the light reflects.

Description

LIGHT GUIDE PLATE, BACKLIGHT UNIT HAVING THE SAME AND LIQUID CRYSTAL DISPLAY DEVICE AND METHOD THEREOF}

The present invention relates to a liquid crystal display device, and more particularly, to a light guide plate, a backlight unit having the same, and a liquid crystal display device including the same.

In general, a liquid crystal display (LCD) is a device for displaying a desired image by adjusting the light transmittance of liquid crystal cells arranged in a matrix form according to image signal information. Form an image on the panel.

The liquid crystal display device using this principle has a tendency that its application range is gradually widening due to the characteristics of light weight, thinness, low power consumption, and the like. In accordance with this trend, liquid crystal displays have been used in office automation equipment, audio / video equipment, and the like. In such a liquid crystal display, the amount of light transmitted is adjusted according to a signal applied to a plurality of control switches arranged in a matrix to display a desired image on a screen.

Recently, liquid crystal displays have been widely applied to not only computer monitors and televisions but also display devices of vehicle navigator systems and portable display devices such as laptops and mobile phones.

Most of the liquid crystal display devices as described above are non-emissive type display devices that display an image by controlling the amount of light source coming from the outside, so that the backlight including a separate light source for irradiating light to the liquid crystal display panel. Requires unit

The backlight unit includes an LED element as a light source, a light guide plate coupled to a light exit surface of the LED element, and a plurality of sheets provided on the light guide plate.

A backlight unit having a light guide plate according to the related art having such a configuration will now be described with reference to FIGS. 1 and 2.

1 is a plan view schematically illustrating a light guide plate according to the related art.

2 is an exploded plan view of a light guide plate and a side reflection sheet according to the prior art, and is a plan view showing a flow of light reflected through the side reflection sheet.

Although not shown in the drawings, a liquid crystal display device having a backlight unit according to the prior art includes a liquid crystal panel, a backlight unit for supplying light to the liquid crystal panel, a panel guide surrounding and supporting the liquid crystal panel and the backlight unit; The bottom cover is coupled to the panel guide and accommodates the backlight unit, and a top case covering the front edge of the liquid crystal panel.

Although not shown in the drawing, the backlight unit may include a light source unit (not shown) for generating light and a light guide plate (not shown in FIG. 1 of FIG. 1) for providing light generated from the light source unit to the front surface of the liquid crystal panel. ), And a reflection sheet (not shown) attached to the rear surface of the light guide plate 40 to reflect the light emitted backward, and laminated on the front surface of the light guide plate 40 so as to be laminated from the light guide plate 40. It includes a plurality of optical sheets (not shown) that scatter light emitted.

1 and 2, the light source unit 50 includes an LED element 51 and a substrate 53 on which the LED element 51 is mounted.

Although not shown in the drawing, the plurality of optical sheets (not shown) are for diffusing and condensing light incident from the light guide plate 40, and are provided as a diffusion sheet, a prism sheet, and a protective sheet.

Meanwhile, as shown in FIGS. 1 and 2, the light guide plate 40 may be manufactured by extrusion and injection according to a shape design. As the material of the light guide plate 40, 'PMMA', 'PC', etc., which are polymer plastic materials having a light transmittance of about 90% or more, are mainly used.

The light incident on the light guide plate 40 is totally reflected at the interface due to the difference in refractive index between the light guide plate 40 and the air, and is guided to the entire light guide plate 40.

In order to improve the light output efficiency of the light guide plate 40, as shown in FIGS. 1 and 2, the light guide plate 40 is attached to each side surface of the light guide plate 40 except for the light receiving part 40a, and the light emitted to the side surface of the light guide plate 40 ( loss) It is possible to improve the brightness by reflecting the light (recycling) again. In this case, the side reflection sheet 43 is composed of a diffuse reflection sheet (sheet) of white (white) material.

In addition, a reflective sheet (not shown) is provided below the light guide plate 40 to reflect some of the light exiting the bottom of the light guide plate 40 to the light emitting surface of the backlight unit (not shown) to increase the light efficiency. In addition, the reflection amount of the entire incident light is adjusted so that the entire outgoing surface has a uniform luminance distribution.

However, according to the prior art, currently widely used white LEDs are composed of a blue chip and a yellow or red or red + green phosphor to generate white light.

The generated light passes through the light incident surface of the light guide plate and is reflected by the dot pattern and the reflective sheet of the light guide plate, and is recognized by the human eye through the optical sheet and the panel.

In this process, the light reflected by the dot pattern on the light guide plate, the reflective sheet, or the like is not uniformly distributed on the screen, thereby causing a color difference between the light incident surface and the incoming light incident surface on the screen.

In particular, as shown in Figures 3 and 4, the color difference sample, that is, the yellow (yellowish) analysis result, there is a color difference between the upper and lower of the backlight, there is a difference in the level of the liquid crystal display module (LCM), but the upper and lower color difference Occurs. That is, when the analysis results at various points of the liquid crystal display module or the backlight are used, a large difference occurs between a bluish color and a yellowish color.

This color difference is generated because the light generated from the LED device is not reflected uniformly into the light guide plate by the dot pattern and the reflector.

Accordingly, the present invention is to solve the above problems, an object of the present invention to improve the image quality by reducing the color difference by using a total reflection sheet of silver (silver) instead of the conventional white diffuse reflection sheet used in the side of the light guide plate A light guide plate for a backlight unit, and a backlight unit and a liquid crystal display device having the same are provided.

In order to achieve the above object, the light guide plate for a backlight unit according to the present invention includes a light incident surface to which light is incident; A light exit surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and the light incident through the light incident surface to be emitted; A light incident surface facing the light incident surface and having a total reflection sheet made of silver; And a rear surface of the light reflecting.

In order to achieve the above object, the backlight unit having a light guide plate according to the present invention includes a light source unit for supplying light to the liquid crystal panel; A light incident surface on which light is incident; A light exit surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and the light incident through the light incident surface to be emitted; A light incident surface facing the light incident surface and having a total reflection sheet made of silver; And a light guide plate having a rear surface reflecting the light; A panel guide surrounding a side portion of the light guide plate to support the liquid crystal panel; An optical sheet disposed on the light guide plate; And a reflective sheet disposed on a lower surface of the light guide plate.

In order to achieve the above object, a liquid crystal display including a backlight unit having a light guide plate according to the present invention comprises a liquid crystal panel; A light source unit for supplying light to the liquid crystal panel; A light incident surface to which light emitted from the light source unit is incident, and a light incident surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and a light incident surface to which light incident through the light incident surface is emitted, A light guide plate facing and having a total reflection sheet made of silver and having a rear surface reflecting the light; A panel guide surrounding a side portion of the light guide plate to support the liquid crystal panel; An optical sheet disposed on the light guide plate; And a reflective sheet disposed on a lower surface of the light guide plate.

According to the light guide plate for a backlight unit according to the present invention, a backlight unit having the same, and a liquid crystal display device including the same, a silver material is provided on a light incident surface instead of a sheet of a conventional white material widely used as a side reflection sheet. By using the total reflection sheet of, the image quality can be improved by reducing the color difference between the light incident surface and the semi-light incident surface. In particular, the total reflection sheet of the silver material applied in the present invention changes the bluish color to the yellowish color, and therefore, the existing bluish color and yellow color This compensates for some yellowish color differences.

1 is a plan view schematically illustrating a light guide plate according to the related art.
2 is an exploded plan view of a light guide plate and a side reflection sheet according to the prior art, and is a plan view showing a flow of light reflected through the side reflection sheet.
3 is a graph illustrating color differences between a light incident surface and a light incident surface at a specific position of a central point of a liquid crystal display module LCM in the case of attaching a white diffuse reflection sheet to a side surface of a light guide plate according to the related art.
4 is a graph showing color difference between a light incident surface and a light incident surface at a specific position of a central point of a backlight when attaching a white diffuse reflection sheet to a side surface of a light guide plate according to the related art.
5 is an exploded perspective view of a liquid crystal display device to which a backlight unit having a light guide plate according to the present invention is applied.
FIG. 6 is a plan view illustrating a state before a total reflection sheet made of silver is attached to a light incident plate of the light guide plate in the backlight unit having the light guide plate according to the present invention.
FIG. 7 is a front view illustrating specific points of a central portion of a screen of a liquid crystal display module (LCM) in the liquid crystal display device having the backlight unit to which the light guide plate according to the present invention is applied.
8 is a graph comparing color coordinate changes according to screen positions of a liquid crystal display module (LCM) in the liquid crystal display device having the backlight unit to which the light guide plate according to the present invention is applied.

Hereinafter, a liquid crystal display including a backlight unit having a light guide plate for a backlight according to the present invention will be described in detail with reference to the accompanying drawings.

4 is an exploded perspective view of a liquid crystal display including a backlight unit having a light guide plate according to the present invention.

5 is an exploded perspective view of a liquid crystal display device to which a backlight unit having a light guide plate according to the present invention is applied.

FIG. 6 is a plan view illustrating a state before a total reflection sheet made of silver is attached to a light incident plate of the light guide plate in the backlight unit having the light guide plate according to the present invention.

In the liquid crystal display device including the backlight unit having the light guide plate according to the present invention, as shown in FIGS. 4, 5, and 6, the liquid crystal panel 110 and the backlight unit supplying light to the liquid crystal panel 110 are provided. The bottom cover 170 coupled to the panel guide 130 and the panel guide 130 surrounding and supporting the liquid crystal panel 110 and the backlight unit 100 and receiving the backlight unit 100. ), And a top case (not shown) covering the front edge of the liquid crystal panel 110.

Here, the liquid crystal panel 110 includes a color filter array substrate 110a and a TFT array substrate 110b and a liquid crystal layer (not shown) interposed therebetween.

Although not shown in the drawing, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the rear surface of the TFT array substrate 110b so that light passing through the liquid crystal panel 110 is cross polarized. It further comprises a front polarizer (not shown) and a rear polarizer (not shown).

In the liquid crystal panel 110, liquid crystal cells forming a pixel unit are arranged in a matrix form, and the liquid crystal cells form an image by adjusting light transmittance according to image signal information transmitted from the driver driving circuit 113.

Although not shown in the drawing, a plurality of gate lines and a plurality of data lines are formed in a matrix form on the TFT array substrate 110b, and thin film transistors (TFTs) are formed at intersections of the gate lines and the data lines. Is formed. The signal voltage transmitted from the driver driving circuit 113 is applied between the pixel electrode and the common electrode (not shown) of the color filter array substrate 110a to be described later through the thin film transistor, and the liquid crystal between the pixel electrode and the common electrode is The light transmittance is determined according to the signal voltage.

Although not shown in the drawing, the color filter array substrate 110a includes a color filter and a common electrode which are formed by repeating red, green, and blue or cyan, magenta, and yellow colors with a black matrix as a boundary. The common electrode is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

In addition, one side of the liquid crystal panel 110 includes a driving driver 113 for driving unit pixels formed in the liquid crystal panel, and a flexible printed circuit board having one end connected to the liquid crystal panel (FPCB). ) Is connected.

The backlight unit 100 may include a light guide plate 140 for generating light, a light guide plate 140 for providing light generated by the light source unit 150 to the front surface of the liquid crystal panel 110, and a light guide plate 140. A reflective sheet 160 attached to the rear surface to reflect the light emitted backward, and a plurality of optical sheets stacked on the front surface of the light guide plate 140 to scatter light emitted from the light guide plate 140 ( 120).

Here, the light source unit 150 may be any one of a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode (LED) device. Here, the case of applying a light emitting diode device (LED device) is taken as an example. In addition, the light source unit 150 includes an LED element 151 and a substrate 153 on which the LED element 151 is mounted. The LED device 151 is a side viewing type device, and the LED device 151 emits light toward the light incident surface 140a of the light guide plate 140. In addition, the substrate 153 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the LED device 151 through the circuit.

The plurality of optical sheets 120 are for diffusing and condensing light incident from the light guide plate 140, and are provided as a diffusion sheet 121, a prism sheet 123, and a protective sheet 125. In some cases, it may be provided with two diffusion sheets and two prism sheets. At this time, the diffusion sheet 121 is composed of a base plate and a bead-shaped coating layer formed on the base plate. The diffusion sheet 121 serves to diffuse the light from the light source unit 150 and supply the light to the liquid crystal panel 110. The diffusion sheet 121 may be used by overlapping two or three. In addition, the prism sheet 123 is formed in a triangular prism-shaped prism on the upper surface having a constant arrangement. The prism sheet 123 collects light diffused from the diffusion sheet 121 in a direction perpendicular to the plane of the upper liquid crystal panel 110. Two pieces of the prism sheet 123 are generally used, and the micro prisms formed on each prism sheet 123 form a predetermined angle. Therefore, the light passing through the prism sheet 123 almost passes vertically to provide a uniform luminance distribution. The uppermost protective sheet 125 protects the prism sheet 123 that is weak to scratches.

Meanwhile, as illustrated in FIG. 4, the light guide plate 140 extends from the light incident surface 140a receiving the light from the LED element 151 and the light incident surface 140a to face the liquid crystal panel 110. A light exit surface 140c, a light incident surface 140b facing the light incident surface 140a, and a back surface 140d facing the light exit surface 140c. Here, the white diffuse reflection sheet 143 is disposed on both side surfaces 140e, and the silver (Ag) total reflection sheet 145 is disposed on the light incident surface 140b. Here, the white diffuse reflection sheet 143 disposed on both side surfaces 140e may not be disposed in some cases. In addition, the total reflection sheet 145 of the silver material changes the bluish color to a yellowish color.

In this case, the light guide plate 140 is positioned along one side of the LED device 151 and is disposed on the rear surface of the liquid crystal panel 110 so that the light generated from the LED device 151 is rear surface of the liquid crystal panel 110. Induce.

The light guide plate 140 changes the light irradiated to the light incident surface 140a from the LED element 151 disposed adjacent to the light incident surface 140a to planar light along one side thereof, and then through the light exit surface 140c. The liquid crystal panel 110 is uniformly delivered. As the material of the light guide plate 140, PMMA (Polymethy-methacrylate), PC, PS, MS, etc., which have high strength and are not easily deformed or broken and have good transmittance, are used.

Here, the light guide plate 140 may have a wedge having a lower surface inclined and a flat upper surface, or a plate type in which both the lower surface and the upper surface are parallel to each other. In the case of a liquid crystal display device applied to a small product such as a notebook PC or a mobile phone, a wedge-shaped light guide plate 140 may be applied, and the light source unit 150 may be provided on a thick sidewall. However, the light source unit 150 may be disposed on at least one side portion of the light guide plate 140.

The panel guide 130 is formed in a rectangular frame shape surrounding the side portion of the light guide plate 140 and is formed of a plastic material or a metal material such as a PC material. In particular, the panel guide 130 is a structure mainly supporting a liquid crystal panel, but in addition to supporting the liquid crystal panel 110, a function of supporting and fixing the light guide plate 140 and the optical sheet 120. Also do. On the other hand, the panel guide 130 may be configured in two straight lines, in addition to the rectangular frame surrounding the side portion of the light guide plate 140 may be configured to fix and support both side portions of the light guide plate 140.

The reflective sheet 160 is provided below the light guide plate 140 to increase light efficiency by reflecting a part of the light emitted to the lower part of the light guide plate 140 to the incoming light receiving surface 140b of the light guide plate 140. The amount of reflection of the entire incident light is adjusted so that the entire outgoing surface has a uniform luminance distribution. In this case, the reflective sheet 160 is made of the same material as the white diffuse reflection sheet 143 disposed on the side surface 140e of the light guide plate 140.

In addition, the bottom cover 170 has a rectangular box shape with an open top, and the components of the backlight unit 100 including the light guide plate 140 and the reflective sheet 160 wrapped by the panel guide 130 are accommodated therein. do.

Accordingly, the bottom cover 170 in which the liquid crystal panel 110 and the backlight unit 100 are accommodated is combined with the top case 180 surrounding the top edge of the liquid crystal panel 110 and the side surface of the panel guide 130. Thus, a liquid crystal display device is achieved.

As shown in Figures 7 and 8, the color coordinates at the measurement position, that is, 1 to 9 positions of the screen of the liquid crystal display device in which a total reflection sheet made of silver material is applied to the light incident plate of the light guide plate according to the present invention having the above configuration. As a result of comparing the changes, it can be seen that in the prior art, the color coordinates vary irregularly from "0.425" to "0.428", but in the present invention, the color coordinates remain almost unchanged at "0.427".

As described above, according to the light guide plate for the backlight unit according to the present invention, the backlight unit having the same, and a liquid crystal display device including the same, the light guide plate instead of the sheet of white material, which is widely used as a side reflecting sheet, By using the total reflection sheet made of silver, the image quality can be improved by reducing the color difference between the light incident surface and the semi-light incident surface. In particular, the total reflection sheet of the silver material applied in the present invention changes the bluish color to the yellowish color, and therefore, the existing bluish color and yellow color This compensates for some yellowish color differences.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art to which the present invention pertains, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

100: backlight unit 110: liquid crystal panel
110a: color filter array substrate 110b: TFT array substrate
113: drive driver 115: printed circuit board
120: optical sheet 121: diffusion sheet
123: prism sheet 125: protective sheet
127: sheet hanger 130: panel guide 140, 240: light guide plate 140a: light incident surface
140b: Input surface 140c: Output surface 140d: Back side 140e: Side view
143: white reflective sheet 145: total reflection sheet silver
150: light source 151: LED element 153: substrate 160: reflective sheet 170: bottom cover 180: top case
200: liquid crystal display module (LCM)

Claims (9)

A light incident surface on which light is incident;
A light exit surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and the light incident through the light incident surface to be emitted;
A light incident surface facing the light incident surface and having a total reflection sheet; And
The light guide plate for a backlight unit including the back surface which the said light reflects. The light guide plate for a backlight unit of claim 1, wherein a white diffuse reflection sheet is disposed on a side surface of the light guide plate except for a light incident surface and a light incident surface. The light guide plate for a backlight unit of claim 1, wherein the total reflection sheet is a total reflection sheet made of silver. A light source unit for supplying light to the liquid crystal panel;
A light incident surface to which light is incident, a light exit surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and a light incident through the light incident surface to be emitted; A light guide plate having a total reflection sheet having an incident light incident surface attached thereto, and a rear surface reflecting the light;
A panel guide surrounding a side portion of the light guide plate to support the liquid crystal panel;
An optical sheet disposed on the light guide plate; And
And a light guide plate including a reflection sheet disposed on a bottom surface of the light guide plate. The backlight unit with a light guide plate according to claim 4, wherein a white diffuse reflection sheet is disposed on a side surface of the light guide plate except for a light incident surface and a light incident surface. The backlight unit with a light guide plate according to claim 4, wherein the total reflection sheet is a total reflection sheet made of silver. A liquid crystal panel;
A light source unit for supplying light to the liquid crystal panel;
A light incident surface to which light emitted from the light source unit is incident, and a light incident surface connected to the light incident surface to emit light incident through the light incident surface toward the upper side, and a light incident surface to which light incident through the light incident surface is emitted, A light guide plate facing and having a total reflection sheet made of silver and having a rear surface reflecting the light;
A panel guide surrounding a side portion of the light guide plate to support the liquid crystal panel;
An optical sheet disposed on the light guide plate; And
And a backlight unit including a reflective sheet disposed on a lower surface of the light guide plate. The liquid crystal display device of claim 7, wherein a white diffuse reflection sheet is disposed on side surfaces of the light guide plate except for a light incident surface and a light incident surface. The liquid crystal display device of claim 7, wherein the total reflection sheet is a total reflection sheet made of silver.


KR1020100137152A 2010-12-28 2010-12-28 Light guide plate, backlight unit having the same and liquid crystal display device and method thereof KR20120075115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100137152A KR20120075115A (en) 2010-12-28 2010-12-28 Light guide plate, backlight unit having the same and liquid crystal display device and method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100137152A KR20120075115A (en) 2010-12-28 2010-12-28 Light guide plate, backlight unit having the same and liquid crystal display device and method thereof

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KR20120075115A true KR20120075115A (en) 2012-07-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150092797A (en) * 2014-02-05 2015-08-17 삼성디스플레이 주식회사 Backlight assembly and display divece having the same
US9507177B2 (en) 2013-09-16 2016-11-29 Samsung Display Co., Ltd. Backlight assembly and display including the same
CN106896444A (en) * 2017-03-30 2017-06-27 北京小米移动软件有限公司 Backlight display module BLU, LCM and electronic equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9507177B2 (en) 2013-09-16 2016-11-29 Samsung Display Co., Ltd. Backlight assembly and display including the same
KR20150092797A (en) * 2014-02-05 2015-08-17 삼성디스플레이 주식회사 Backlight assembly and display divece having the same
CN106896444A (en) * 2017-03-30 2017-06-27 北京小米移动软件有限公司 Backlight display module BLU, LCM and electronic equipment
CN106896444B (en) * 2017-03-30 2020-07-21 北京小米移动软件有限公司 Backlight display module B L U, L CM and electronic equipment

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