WO2012030086A2 - Unité de rétro-éclairage - Google Patents

Unité de rétro-éclairage Download PDF

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Publication number
WO2012030086A2
WO2012030086A2 PCT/KR2011/006057 KR2011006057W WO2012030086A2 WO 2012030086 A2 WO2012030086 A2 WO 2012030086A2 KR 2011006057 W KR2011006057 W KR 2011006057W WO 2012030086 A2 WO2012030086 A2 WO 2012030086A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
backlight unit
guide plate
light guide
unit according
Prior art date
Application number
PCT/KR2011/006057
Other languages
English (en)
Other versions
WO2012030086A3 (fr
Inventor
Kyoung Jong Yoo
Kyoung Soo Ahn
Sang Jun Park
Original Assignee
Lg Innotek Co., Ltd.
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 Lg Innotek Co., Ltd. filed Critical Lg Innotek Co., Ltd.
Publication of WO2012030086A2 publication Critical patent/WO2012030086A2/fr
Publication of WO2012030086A3 publication Critical patent/WO2012030086A3/fr

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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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Definitions

  • the present disclosure relates to a backlight unit.
  • Cold cathode fluorescent lamps had been widely used as backlight light sources of liquid crystal displays (LCDs) owing to their inexpensive prices and easy-to-assemble characteristics.
  • cold cathode fluorescent lamps have demerits such as mercury-related environmental problems, low response time, and poor color reproduction characteristics.
  • LEDs light emitting diodes
  • Backlight units can be classified into edge type backlight units and direct type backlight units.
  • edge type backlight units light is incident on a side of a light guide plate, and the light is guided to a panel through the top surface of the light guide plate.
  • an LED is disposed at a backside of a diffusion plate, and light emitted from the LED is supplied to a panel through the diffusion plate.
  • edge type backlight units can be easily made in thin shapes, it is difficult to ensure light uniformity if the size of a liquid crystal panel is large.
  • direct type backlight units into thin shapes due to a distance between an LED and a diffusion plate although direct type backlight units can be easily made in large sizes.
  • Embodiments provide a backlight unit including a thinner light guide plate.
  • a backlight unit includes: a light guide plate including a plurality of grooves; a plurality of side emitting type light emitting devices inserted in the grooves, respectively; a PCB (printed circuit board) on which the side emitting type light emitting devices are disposed; and a reflection plate between the light guide plate and the PCB.
  • the thickness of the light guide plate can be reduced.
  • the grooves are uniformly arranged along the light guide plate and the light emitting devices are disposed respectively in the grooves, uniform light can be discharged from the light guide plate.
  • the light shield reflection patterns are disposed on the light output surface of the light guide plate at positions corresponding to the grooves formed in the light guide plate and where light rays emitted from the light emitting devices are concentrated, so as to block light rays concentrating at the positions. Therefore, the backlight unit can have reduced hot spots and prevent brightness irregularity.
  • the backlight unit of the present disclosure light rays emitted from the light emitting devices are reflected by the light shield reflection patterns, and the reflected light rays propagate along various paths in the light guide plate. Then, the light rays are discharged to the outside of the light guide plate. Therefore, the uniformity of light rays discharged from the light guide plate can be improved.
  • Fig. 1 is a schematic sectional view illustrating a backlight unit according to an embodiment.
  • Fig. 2 is a schematic sectional view illustrating a backlight unit according to another embodiment.
  • Fig. 3 is a schematic sectional view illustrating a comparison example of the backlight unit of the other embodiment.
  • Fig. 4 is a schematic sectional view for explaining light propagation paths in the comparison example of the backlight unit of the other embodiment.
  • Fig. 5 is a schematic sectional view for explaining light propagation paths in the backlight unit of the other embodiment.
  • Fig. 6 is a schematic sectional view illustrating a backlight unit according to another embodiment.
  • Fig. 1 is a schematic sectional view illustrating a backlight unit according to an embodiment.
  • the backlight unit of the embodiment includes: a light guide plate 100 in which a plurality of grooves 110 are formed; a plurality of side emitting type light emitting devices 310 inserted in the grooves 110, respectively; a printed circuit board (PCB) 300 on which the side emitting type light emitting devices 310 are disposed; and a reflection plate 320 disposed between the light guide plate 100 and the PCB 300.
  • a light guide plate 100 in which a plurality of grooves 110 are formed
  • a plurality of side emitting type light emitting devices 310 inserted in the grooves 110, respectively
  • a printed circuit board (PCB) 300 on which the side emitting type light emitting devices 310 are disposed
  • a reflection plate 320 disposed between the light guide plate 100 and the PCB 300.
  • the light guide plate 100 may be formed of a transparent material.
  • the light guide plate 100 may be formed of one of an acrylic resin-based material such as polymethylmethacrylate (PMMA), a polyethylene terephthalate (PET) resin, a poly carbonate (PC) resin, and a polyethylene naphthalate (PEN) resin.
  • PMMA polymethylmethacrylate
  • PET polyethylene terephthalate
  • PC poly carbonate
  • PEN polyethylene naphthalate
  • the side emitting type light emitting devices 310 may include light emitting diodes (LEDs).
  • the LEDs may be color LEDs capable of emitting at least one of red light, blue light, green light, and white light, or may be ultraviolet (UV) LEDs.
  • the color LEDs may include a combination of red, blue, green, and white LEDs. Arrangement of the color LEDs and light types of the color LEDs may be changed within the technical scope of the embodiment.
  • the side emitting type light emitting devices 310 may be provided in the form of packages in which light emitting diodes (LEDs) are packaged.
  • LEDs light emitting diodes
  • the PCB 300 on which the side emitting type light emitting devices 310 are disposed may be disposed under the light guide plate 100.
  • the PCB 300 may be a metal core PCB, an FR-4 PCB, a general PCB, a flexible PCB, or a ceramic PCB.
  • the PCB 300 is not limited thereto, but may be any other PCB in the technical scope of the embodiments.
  • the grooves 110 are uniformly formed in the bottom surface of the light guide plate 100, and the side emitting type light emitting devices 310 are inserted in the grooves 110, respectively.
  • the reflection plate 320 is disposed between the light guide plate 100 and the PCB 300.
  • the reflection plate 320 may be formed of an alloy including silver or aluminum.
  • adhesive layers 321 and 322 may be disposed on top and bottom sides of the reflection plate 320 to bond the reflection plate 320 to the light guide plate 100 and the PCB 300.
  • the adhesive layers 321 and 322 include a first adhesive layer 321 disposed between the light guide plate 100 and the reflection plate 320, and a second adhesive layer 322 disposed between the PCB 300 and the reflection plate 320.
  • the adhesive layers 321 and 322 may be formed of a transparent material such as an epoxy resin or a silicon-based resin.
  • a concave-convex pattern 101 may be disposed on the bottom surface of the light guide plate 100 where the first adhesive layer 321 is bonded, so as to increase light discharge efficiency of the light guide plate 100 when light is incident on the light guide plate 100.
  • the pattern 101 is disposed on a region of the light guide plate 100 where the grooves 110 are not formed, and the pattern 101 is not deeper than the grooves 110.
  • the thickness of the light guide plate 100 can be reduced.
  • the grooves 110 are uniformly arranged along the light guide plate 100 and the side emitting type light emitting devices 310 are disposed respectively in the grooves 110, uniform light can be discharged from the light guide plate 100.
  • Fig. 2 is a schematic sectional view illustrating a backlight unit according to another embodiment.
  • separate light shield reflection patterns 700 are disposed on a light output surface (top surface) of a light guide plate 100 at positions corresponding to grooves 110 formed in the light guide plate 100 as shown in Fig. 2.
  • the light shield reflection patterns 700 are disposed on the light output surface of the light guide plate 100 at positions where light rays emitted from side emitting type light emitting devices 310 disposed in the grooves 110 are concentrated to cause hot spots.
  • the light shield reflection patterns 700 are arranged on the top surface of the light guide plate 100 at positions where portions of the light shield reflection patterns 700 are overlapped with the grooves 110 along optical paths of light rays emitted from the side emitting type light emitting devices 310.
  • the light shield reflection patterns 700 may be white coating patterns or metal patterns.
  • the light shield reflection patterns 700 are disposed on the light output surface of the light guide plate 100 at positions corresponding to the grooves 110 formed in the light guide plate 100 and where light rays emitted from the side emitting type light emitting devices 310 are concentrated, so as to block light rays concentrating at the positions. Therefore, the backlight unit can have reduced hot spots and prevent brightness irregularity.
  • the light shield reflection patterns 700 reflect light rays emitted from the side emitting type light emitting devices 310. Then, the reflected light rays propagate along various paths in the light guide plate 100 and are discharged to the outside of the light guide plate 100. Therefore, the uniformity of light rays discharged from the light guide plate 100 can be improved.
  • Fig. 3 is a schematic sectional view illustrating a comparison example of the backlight unit of the other embodiment
  • Fig. 4 is a schematic sectional view for explaining light propagation paths in the comparison example of the backlight unit of the other embodiment
  • Fig. 5 is a schematic sectional view for explaining light propagation paths in the backlight unit of the other embodiment.
  • light shield reflection patterns 700 are not disposed on the top surface of a light guide plate 100.
  • rays A and B emitted from the side emitting type light emitting device 310 are incident onto the light guide plate 100 through an air layer and are discharged to the outside through a region (K).
  • light emitted from the comparison example may have brightness irregularity due to a hot spot.
  • the light shield reflection patterns 700 are disposed on the top surface of the light guide plate 100, light rays A1 and A2 emitted from the side emitting type light emitting device 310 propagate through an air layer and the light guide plate 100 while being refracted at the air layer and the light guide plate 100. Then, the light rays A1 and A2 are reflected by the light shield reflection pattern 700 back to the light guide plate 100.
  • light rays A1 and B1 are not concentrated at a specific region of the light guide plate 100. Accordingly, when light is emitted from the backlight unit, hot spots can be reduced, and thus brightness irregularity can be prevented.
  • reflection plate 320(refertoFig.1) isdisposedunderthelightguideplate100,lightreflectedfromthelightshieldreflectionpatterns700canbereflectedagaintothelightguideplate100.
  • Fig. 6 is a schematic sectional view illustrating a backlight unit according to another embodiment.
  • separate light shield reflection patterns 700 are disposed on a light output surface (top surface) of a light guide plate 100 at positions corresponding to grooves 110 formed in the light guide plate 100 as shown in Fig. 6.
  • the light shield reflection patterns 700 are disposed on the light output surface of the light guide plate 100 at positions where light rays emitted from side emitting type light emitting devices 310 disposed in the grooves 110 are concentrated to cause hot spots.
  • the light shield reflection patterns 700 are arranged on the top surface of the light guide plate 100 at positions where portions of the light shield reflection patterns 700 are overlapped with the grooves 110 along optical paths of light rays emitted from the side emitting type light emitting devices 310.
  • the light shield reflection patterns 700 may be white coating patterns or metal patterns.
  • a transparent protective layer 710 may be further disposed on the top surface of the light guide plate 100 to cover the light shield reflection patterns 700.
  • the transparent protective layer 710 may be formed of a transparent resin having a refractive index lower than that of the light guide plate 100.
  • the light shield reflection patterns 700 are disposed on the light output surface of the light guide plate 100 at positions corresponding to the grooves 110 formed in the light guide plate 100 and where light rays emitted from the side emitting type light emitting devices 310 are concentrated, so as to block light rays concentrating at the positions. Therefore, the backlight unit can have reduced hot spots and prevent brightness irregularity.
  • the thickness of the light guide plate can be reduced.
  • the grooves are uniformly arranged along the light guide plate and the light emitting devices are disposed respectively in the grooves, uniform light can be discharged from the light guide plate.
  • the light shield reflection patterns are disposed on the light output surface of the light guide plate at positions corresponding to the grooves formed in the light guide plate and where light rays emitted from the light emitting devices are concentrated, so as to block light rays concentrating at the positions. Therefore, the backlight unit can have reduced hot spots and prevent brightness irregularity.
  • the backlight unit of the present disclosure light rays emitted from the light emitting devices are reflected by the light shield reflection patterns, and the reflected light rays propagate along various paths in the light guide plate. Then, the light rays are discharged to the outside of the light guide plate. Therefore, the uniformity of light rays discharged from the light guide plate can be improved.

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  • 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)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

La présente invention concerne une unité de rétro-éclairage. L'unité de rétro-éclairage comprend une plaque guide de lumière, une pluralité de dispositifs électroluminescents à luminescence latérale, une carte de circuit imprimé (« Printed Circuit Board » ou PCB), et une plaque réfléchissante. La plaque guide de lumière comprend une pluralité de rainures. Les dispositifs électroluminescents à luminescence latérale sont insérés dans les rainures, respectivement. Les dispositifs électroluminescents à luminescence latérale sont disposés sur la PCB. La plaque réfléchissante est disposée entre la plaque guide de lumière et la PCB.
PCT/KR2011/006057 2010-09-03 2011-08-17 Unité de rétro-éclairage WO2012030086A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100086258A KR20120023921A (ko) 2010-09-03 2010-09-03 백라이트 유닛
KR10-2010-0086258 2010-09-03

Publications (2)

Publication Number Publication Date
WO2012030086A2 true WO2012030086A2 (fr) 2012-03-08
WO2012030086A3 WO2012030086A3 (fr) 2012-04-26

Family

ID=45773345

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2011/006057 WO2012030086A2 (fr) 2010-09-03 2011-08-17 Unité de rétro-éclairage

Country Status (3)

Country Link
KR (1) KR20120023921A (fr)
TW (1) TWI596407B (fr)
WO (1) WO2012030086A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104501050A (zh) * 2014-12-31 2015-04-08 深圳市华星光电技术有限公司 光源模块及具有该光源模块的背光模组
CN104678478A (zh) * 2013-11-29 2015-06-03 英业达科技有限公司 导光结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI547742B (zh) * 2015-06-01 2016-09-01 揚昇照明股份有限公司 背光模組
CN113031347A (zh) * 2021-03-29 2021-06-25 武汉华星光电技术有限公司 背光模组及显示装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004213943A (ja) * 2002-12-27 2004-07-29 Casio Comput Co Ltd 面状照明装置
KR20050055387A (ko) * 2003-12-08 2005-06-13 엘지.필립스 엘시디 주식회사 액정표시모듈
JP2008268707A (ja) * 2007-04-24 2008-11-06 Toppan Printing Co Ltd 光学シート、それを用いたバックライトユニット、およびディスプレイ装置
KR20090078763A (ko) * 2008-01-15 2009-07-20 롬 앤드 하스 덴마크 파이낸스 에이에스 다중레이어 결합 백라이트 조사 어셈블리

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750130B1 (ko) * 2005-03-23 2007-08-21 삼성전자주식회사 발광 어셈블리, 백라이트 유닛 및 디스플레이
JP4579146B2 (ja) * 2005-12-06 2010-11-10 株式会社 日立ディスプレイズ 表示装置および面状光源装置
JP5180158B2 (ja) * 2008-10-31 2013-04-10 スタンレー電気株式会社 液晶用バックライト

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004213943A (ja) * 2002-12-27 2004-07-29 Casio Comput Co Ltd 面状照明装置
KR20050055387A (ko) * 2003-12-08 2005-06-13 엘지.필립스 엘시디 주식회사 액정표시모듈
JP2008268707A (ja) * 2007-04-24 2008-11-06 Toppan Printing Co Ltd 光学シート、それを用いたバックライトユニット、およびディスプレイ装置
KR20090078763A (ko) * 2008-01-15 2009-07-20 롬 앤드 하스 덴마크 파이낸스 에이에스 다중레이어 결합 백라이트 조사 어셈블리

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104678478A (zh) * 2013-11-29 2015-06-03 英业达科技有限公司 导光结构
CN104501050A (zh) * 2014-12-31 2015-04-08 深圳市华星光电技术有限公司 光源模块及具有该光源模块的背光模组
WO2016106846A1 (fr) * 2014-12-31 2016-07-07 深圳市华星光电技术有限公司 Module de source lumineuse et module de rétro-éclairage muni de celui-ci

Also Published As

Publication number Publication date
WO2012030086A3 (fr) 2012-04-26
KR20120023921A (ko) 2012-03-14
TWI596407B (zh) 2017-08-21
TW201219926A (en) 2012-05-16

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