KR20130074552A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

Info

Publication number
KR20130074552A
KR20130074552A KR1020110142659A KR20110142659A KR20130074552A KR 20130074552 A KR20130074552 A KR 20130074552A KR 1020110142659 A KR1020110142659 A KR 1020110142659A KR 20110142659 A KR20110142659 A KR 20110142659A KR 20130074552 A KR20130074552 A KR 20130074552A
Authority
KR
South Korea
Prior art keywords
liquid crystal
guide plate
light guide
light
crystal display
Prior art date
Application number
KR1020110142659A
Other languages
Korean (ko)
Other versions
KR102050433B1 (en
Inventor
공현식
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.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020110142659A priority Critical patent/KR102050433B1/en
Publication of KR20130074552A publication Critical patent/KR20130074552A/en
Application granted granted Critical
Publication of KR102050433B1 publication Critical patent/KR102050433B1/en

Links

Images

Classifications

    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02B6/0055—Reflecting 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
    • G02F1/133553—Reflecting 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/02—Function characteristic reflective

Landscapes

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

Abstract

PURPOSE: A liquid crystal display is provided to form a chamfer on a lower corner of a light guide plate and induce light, which scatters within the light guide plate, to implement total reflection, thereby improving edge darkness of screen. CONSTITUTION: Backlight is installed in a rear side of a liquid crystal panel (110) and emits light to a liquid crystal panel. A guide panel (145) receives and fixes the liquid crystal panel and backlight. A reflecting plate (141) is installed in a rear side of a light guide plate (142). A chamfer (142-1) is formed in a lower corner of the light guide plate and implements total reflection of light which scatters within the light guide plate.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display having an edge type backlight in which a lamp is disposed on a side surface of a liquid crystal panel.

2. Description of the Related Art In general, a liquid crystal display device is a display device which can display a desired image by individually supplying data signals according to image information to pixels arranged in a matrix form and adjusting light transmittance of the pixels.

Accordingly, a liquid crystal display device includes a liquid crystal panel in which pixels are arranged in a matrix form, and a driver for driving the pixels.

The liquid crystal panel includes a thin film transistor array substrate and a color filter substrate bonded to each other so as to maintain a uniform cell gap, and a liquid crystal layer formed in a cell gap between the array substrate and the color filter substrate. And a liquid crystal layer.

At this time, a common electrode and a pixel electrode are formed on the liquid crystal panel in which the array substrate and the color filter substrate are bonded together to apply an electric field to the liquid crystal layer.

Therefore, when the voltage of the data signal applied to the pixel electrode is controlled while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer is rotated by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode to transmit or block the light by each pixel is to display a text or image.

At this time, since the liquid crystal display device is a light-receiving device that can not emit light itself but displays an image by adjusting the transmittance of light coming from the outside, a separate device for irradiating light to the liquid crystal panel, that is, a backlight is required .

The backlight is disposed on one side or both sides of the liquid crystal panel so that the light is reflected, diffused, and condensed through the light guide plate, the reflection plate, and the optical sheet to be transmitted to the front surface of the liquid crystal panel. type and a direct type in which a lamp is disposed on the back surface of the liquid crystal panel so that light is transmitted directly to the front surface of the liquid crystal panel.

1 is a cross-sectional view schematically showing a part of a general liquid crystal display device, and schematically shows a part of the constitution of a liquid crystal display device provided with an edge-type backlight.

As shown in the drawing, a general liquid crystal display device mainly includes a liquid crystal panel 10 in which a liquid crystal is injected between a color filter substrate 6 and an array substrate 5 to output an image, And a guide panel 45 for receiving and fixing the backlight to the liquid crystal panel 10 and the backlight for emitting light over the entire surface of the liquid crystal panel 10.

At this time, upper and lower polarizers 1 and 11 are attached to the outer sides of the color filter substrate 6 and the array substrate 5, respectively. The lower polarizers 11 polarize light passing through the backlight, The upper polarizer 1 polarizes the light transmitted through the liquid crystal panel 10.

An LED assembly (not shown) for generating light is provided on one side of the light guide plate 42. A reflection plate 41 is provided on the back surface of the light guide plate 42. [

Although not shown in the figure, the LED assembly includes an LED array, a LED printed circuit board (PCB) for driving the LED array, and a heat radiating pad for emitting heat generated in the LED array.

The light emitted from the LED array is incident on a side surface of the light guide plate 42 having a transparent material and the reflection plate 41 disposed on the back surface of the light guide plate 42 reflects light transmitted to the back surface of the light guide plate 42, The light is reflected toward the optical sheets 43 on the upper surface of the light guide plate 42 to reduce light loss and improve the uniformity.

The liquid crystal panel 10 composed of the color filter substrate 6 and the array substrate 5 is mounted on the upper part of the backlight constructed as described above through the guide panel 45. The liquid crystal panel 10 and the guide panel 45, And the backlight are coupled to each other by a cover bottom 50 and an upper case top 60 to constitute a liquid crystal display device.

At this time, a predetermined pattern (not shown) is formed under the light guide plate 42 to uniformly diffuse the light. The pattern is formed on the light guide plate 42 to improve the brightness of the active area (AA) As shown in FIG.

The region where the pattern is not formed has a lower luminance than the region Ap in which the pattern is formed, so that the observer feels darker than the periphery when observing the edge of the screen AA.

When the distance between the screen AA and the guide panel 45 is narrow, light passing through the light guide plate 42 may not come out of the screen AA because it hits the guide panel 45, I feel darkness.

An object of the present invention is to provide a liquid crystal display device capable of improving the darkness of a screen edge.

Other objects and features of the present invention will be described in the following description of the invention and claims.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel that outputs an image; A backlight disposed on a rear surface of the liquid crystal panel and emitting light to the liquid crystal panel; And a guide panel for receiving and fixing the liquid crystal panel and the backlight. The light guide plate constituting the backlight has a chamfer formed at its lower corner so that light scattered in the light guide plate is totally reflected by the chamfer ).

Here, the backlight may include a light guide plate disposed on a rear surface of the liquid crystal panel; A light source disposed on at least one side of the light guide plate to generate light; And a reflection plate disposed on a back surface of the light guide plate.

In this case, when the light guide plate is formed of polymethyl methacrylate (PMMA), the light entering the air from the light guide plate is totally reflected at an incident angle of 48 degrees or more.

And the chamfer is formed on the lower edge of the light guide plate so as to leave a side surface of the light guide plate.

At this time, an angle between the side surface of the light guide plate and the chamfer is greater than 90 degrees.

When the light source is disposed on one side of the light guide plate, the chamfer is formed at three lower corners of the light guide plate on which the light source is not disposed.

When the light source is disposed on both sides of the light guide plate, the chamfer is formed at two lower corners of the light guide plate on which the light source is not disposed.

And a lower cover bottom and a top case top for coupling the liquid crystal panel, the guide panel and the backlight to each other.

As described above, the liquid crystal display device according to the present invention provides a chamfer at the lower edge of the light guide plate to guide the light scattered in the light guide plate to be totally reflected by the chamfer, thereby improving the darkness of the screen edge .

1 is a cross-sectional view schematically showing a part of a general liquid crystal display device.
2 is an exploded perspective view schematically showing a structure of a liquid crystal display device according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing a part of a liquid crystal display device according to an embodiment of the present invention.
4 is a view for explaining a phenomenon in which total internal reflection occurs.
FIG. 5 is a cross-sectional view illustrating a state in which total reflection occurs through a chamfer formed on a lower edge of a light guide plate in the liquid crystal display according to the embodiment of the present invention shown in FIG.

Hereinafter, preferred embodiments of the liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view schematically showing the structure of a liquid crystal display device according to an embodiment of the present invention.

3 is a cross-sectional view schematically showing a part of a liquid crystal display device according to an embodiment of the present invention, schematically showing a part of the constitution of a liquid crystal display device provided with an edge-type backlight. However, the present invention is not limited thereto, and the present invention is also applicable to a liquid crystal display device having a direct-type backlight.

As shown in the figure, a liquid crystal display according to an embodiment of the present invention includes a liquid crystal panel 110 in which pixels are arranged in a matrix and outputs an image, drivers 115 and 116 for driving the pixels, A backlight installed on the rear surface of the panel 110 to emit light over the entire surface of the liquid crystal panel 110 and a guide panel 145 for receiving and fixing the liquid crystal panel 110 and the backlight.

The liquid crystal panel 110 includes a color filter substrate 106 and an array substrate 105 bonded to each other such that a uniform cell gap is maintained so as to face the liquid crystal panel 110. The liquid crystal panel 110 includes a liquid crystal layer 110 formed on a cell gap between the color filter substrate 106 and the array substrate 105, Layer (not shown).

Although common electrodes and pixel electrodes are formed on the liquid crystal panel 110 in which the color filter substrate 106 and the array substrate 105 are bonded together to apply an electric field to the liquid crystal layer, When the voltage of the data signal applied to the pixel electrode is controlled in the state where the voltage is applied to the electrode, the liquid crystal of the liquid crystal layer rotates by the dielectric anisotropy according to the electric field between the common electrode and the pixel electrode, So that characters or images are displayed.

In order to control the voltage of the data signal applied to the pixel electrode on a pixel-by-pixel basis, a switching element such as a thin film transistor (TFT) is individually provided in the pixels.

The upper and lower polarizers 101 and 111 are attached to the outside of the liquid crystal panel 110. The lower polarizer 111 polarizes the light passing through the backlight and the upper polarizer 101, Polarizes the light passing through the liquid crystal panel 110. [

A light source such as an LED assembly 130 for generating light is installed on one side of the light guide plate 142 and a reflection plate 141 is provided on the back side of the light guide plate 142. [ However, the present invention is not limited to the light source such as the LED assembly 130, and a light source to which a cold cathode fluorescent lamp (CCFL) is applied may be used.

The LED assembly 130 includes an LED array 131, an LED printed circuit board (PCB) 132 for driving the LED array 131, and heat generated from the LED array 131 And a heat dissipation pad (not shown) for dissipating heat.

The light emitted from the LED array 131 is incident on a side surface of the light guide plate 142 of transparent material and the reflection plate 141 disposed on the back surface of the light guide plate 142 is transmitted to the back surface of the light guide plate 142 Light is reflected toward the optical sheets 143 on the upper surface of the light guide plate 142 to reduce light loss and improve uniformity.

The liquid crystal panel 110 including the color filter substrate 106 and the array substrate 105 is mounted on the upper part of the backlight configured as described above through the guide panel 145. The liquid crystal panel 110 and the guide panel 145, And the backlight are coupled to each other by the lower cover bottom 150 and the upper case top 160 to constitute a liquid crystal display device.

In this case, in order to satisfy the specification required by the customer in the past, in the process of designing a structure in which the darkness occurs on the edge of the screen structurally or in the process of designing to improve the luminance of the entire screen, there was.

In the liquid crystal display device according to the embodiment of the present invention, a chamfer 142-1 is formed at the lower corner of the light guide plate 142 so that light scattering in the light guide plate 142 is transmitted to the chamfer 142-1. So as to improve the darkness of the edge of the screen.

That is, the total reflection theory is applied to the area of the light guide plate 142 where darkness occurs, thereby improving the darkness by increasing the amount of reflection more than the amount of light is transmitted, and this will be described in detail with reference to the drawings.

4 is a diagram for explaining a phenomenon in which total internal reflection occurs.

Referring to FIG. 4, it can be seen that light incident from the light guide plate into the air is incident on the light medium in a dense medium, and the refracted angle? R becomes larger than the incident angle? I.

At this time, the refraction angle [theta] r becomes larger as the incident angle [theta] i becomes larger. The incident angle [theta] i when the refraction angle [theta] r becomes 90 degrees is referred to as a critical angle.

When the incidence angle? I is gradually increased as described above, the total reflection occurs when the angle is greater than a specific angle, that is, a critical angle or more. By using such a principle, the darkness of the screen edge can be improved.

Referring to Equation (1), light incident from the light guide plate into the air is totally reflected at an incident angle of about 48 degrees or more.

Figure pat00001

In this case, n and n1 are the refractive indexes of the light guide plate and air, respectively, and n1 is 1.55 when the light guide plate is formed of polymethyl methacrylate (PMMA).

FIG. 5 is a cross-sectional view illustrating a state in which total reflection occurs through a chamfer formed on a lower edge of a light guide plate in the liquid crystal display device according to the embodiment of the present invention shown in FIG.

5, a chamfer 142-1 is formed on the lower edge of the light guide plate 142 to increase the incident angle of light reaching the chamfer 142-1, thereby causing total reflection without bending toward the air . As a result, the darkness of the screen edge can be improved.

As described above, by forming the chamfer 142-1 in the lower corner of the light guide plate 142 and changing the light reflection path, the darkness of the screen edge can be improved.

The chamfer 142-1 may be formed on the lower edge of the light guide plate 142 so as to leave a part of the side surface 142-2 of the light guide plate 142. The side surface 142-2 of the light guide plate 142 The larger the angle? Formed by the chamfer 142-1 and the chamfer 142-1 becomes, the more the total reflection occurs.

At this time, when the light source is disposed only on one side of the light guide plate 142, the chamfer 142-1 may be formed at the lower three corners of the light guide plate 142 where the light source is not disposed. However, the present invention is not limited thereto. The chamfer 142-1 may be formed at one or two corners of the lower side of the light guide plate 142 where the light source is not disposed.

In addition, when the light source is disposed on both sides of the light guide plate 142, the chamfer 142-1 may be formed at two lower corners of the light guide plate 142 where the light source is not disposed. However, the present invention is not limited thereto, and the chamfer 142-1 may be formed at one lower corner of the light guide plate 142 in which the light source is not disposed.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

101, 111: Polarizing plate 105: Array substrate
106: color filter substrate 110: liquid crystal panel
141: reflector 142: light guide plate
142-1: chamfer 143: optical sheet
145: Guide panel 150: Cover bottom
160: Case Top

Claims (8)

A liquid crystal panel for outputting an image;
A backlight disposed on a rear surface of the liquid crystal panel and emitting light to the liquid crystal panel; And
And a guide panel for receiving and fixing the liquid crystal panel and the backlight. The light guide plate constituting the backlight has a chamfer at a lower edge thereof, so that light scattered in the light guide plate is totally reflected by the chamfer, And the liquid crystal display device. 2. The backlight assembly of claim 1,
A light guide plate disposed on a rear surface of the liquid crystal panel;
A light source disposed on at least one side of the light guide plate to generate light; And
And a reflection plate disposed on a back surface of the light guide plate. The liquid crystal display of claim 2, wherein when the light guide plate is made of polymethylmethacrylate (PMMA), the light entering the air from the light guide plate is totally reflected at an incident angle of 48 degrees or more. The liquid crystal display of claim 2, wherein the chamfer is formed on a lower edge of the light guide plate so as to leave a side surface of the light guide plate. The liquid crystal display of claim 4, wherein an angle between the left side of the light guide plate and the chamfer is greater than 90 degrees. The liquid crystal display of claim 2, wherein when the light source is disposed on one side of the light guide plate, the chamfer is formed at three lower corners of the light guide plate on which the light source is not disposed. The liquid crystal display of claim 2, wherein when the light source is disposed on both sides of the light guide plate, the chamfer is formed at two lower corners of the light guide plate on which the light source is not disposed. The liquid crystal display of claim 1, further comprising a lower cover bottom and a top case top for coupling the liquid crystal panel, the guide panel and the backlight to each other.
KR1020110142659A 2011-12-26 2011-12-26 Liquid crystal display device KR102050433B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110142659A KR102050433B1 (en) 2011-12-26 2011-12-26 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110142659A KR102050433B1 (en) 2011-12-26 2011-12-26 Liquid crystal display device

Publications (2)

Publication Number Publication Date
KR20130074552A true KR20130074552A (en) 2013-07-04
KR102050433B1 KR102050433B1 (en) 2019-11-29

Family

ID=48988625

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110142659A KR102050433B1 (en) 2011-12-26 2011-12-26 Liquid crystal display device

Country Status (1)

Country Link
KR (1) KR102050433B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150050612A (en) * 2013-10-29 2015-05-11 엘지디스플레이 주식회사 Liquid crystal display device
KR20190070526A (en) * 2017-12-13 2019-06-21 엘지디스플레이 주식회사 Liquid crystal display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0894846A (en) * 1994-09-27 1996-04-12 Toshiba Electron Eng Corp Light source device
KR20000016446U (en) * 1999-02-01 2000-09-25 김순택 Liquid crystal display device
KR20110049550A (en) * 2009-11-05 2011-05-12 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0894846A (en) * 1994-09-27 1996-04-12 Toshiba Electron Eng Corp Light source device
KR20000016446U (en) * 1999-02-01 2000-09-25 김순택 Liquid crystal display device
KR20110049550A (en) * 2009-11-05 2011-05-12 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150050612A (en) * 2013-10-29 2015-05-11 엘지디스플레이 주식회사 Liquid crystal display device
KR20190070526A (en) * 2017-12-13 2019-06-21 엘지디스플레이 주식회사 Liquid crystal display device

Also Published As

Publication number Publication date
KR102050433B1 (en) 2019-11-29

Similar Documents

Publication Publication Date Title
US8780294B2 (en) Display device comprising first and second light guide plates that respectively include a plurality of first and second recessed patterns and flat surfaces directly facing each other
US10578909B2 (en) Display apparatus with dichroic filter
KR20140021386A (en) Backlight and display device including the same
KR20090073897A (en) Liquid crystal display device using infrared rays source and multi tourch system using the same
WO2014054510A1 (en) Light source device and display device equipped with same
JP6964447B2 (en) Display device
KR102332577B1 (en) Back light unit and display device comprising the same
KR102485634B1 (en) Liquid crystal display device
KR20130051168A (en) Liquid crystal panel assembly and image display apparatus having the same
JP2018163315A (en) Display
KR102050433B1 (en) Liquid crystal display device
KR101477425B1 (en) Back light unit
KR101649219B1 (en) Liquid crystal display device
WO2016104310A1 (en) Liquid crystal display device
KR102078020B1 (en) Liquid crystal display device
KR20130025765A (en) Liquid crystal display device
KR20120087409A (en) Backlight Unit
KR20120038356A (en) Light guide plate and liquid crystal display device module including the same
JP2010055771A (en) Light guide and liquid crystal display
KR102002458B1 (en) Liquid crystal display device
KR20100028458A (en) Light guide plate and backlight unit for liquid crystal display device using the same
KR102569966B1 (en) Light emitting module and a display device comprises the same
KR20070114450A (en) Liquid crystal display device
KR102135918B1 (en) Liquid crystal display device having backlight unit to be able to control viewing angle
KR20150062796A (en) Display device having direct type backlight unit and method for fabricating the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
E902 Notification of reason for refusal
AMND Amendment
E90F Notification of reason for final refusal
AMND Amendment
X701 Decision to grant (after re-examination)
GRNT Written decision to grant