CN1049742C - 液晶显示器的后光发生装置 - Google Patents

液晶显示器的后光发生装置 Download PDF

Info

Publication number
CN1049742C
CN1049742C CN92102671A CN92102671A CN1049742C CN 1049742 C CN1049742 C CN 1049742C CN 92102671 A CN92102671 A CN 92102671A CN 92102671 A CN92102671 A CN 92102671A CN 1049742 C CN1049742 C CN 1049742C
Authority
CN
China
Prior art keywords
light
passing board
generating apparatus
scatter plate
plate
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
CN92102671A
Other languages
English (en)
Other versions
CN1070053A (zh
Inventor
朴钟浩
李桂承
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung Display Devices 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 Samsung Display Devices Co Ltd filed Critical Samsung Display Devices Co Ltd
Publication of CN1070053A publication Critical patent/CN1070053A/zh
Application granted granted Critical
Publication of CN1049742C publication Critical patent/CN1049742C/zh
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from 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
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

公开了液晶显示器的一种后光发生装置，其透光板30制成相对于散射板10按预定角度倾斜，且该两板之间的空间充有折射率良好的散射材料20。本发明采用透射率良好的散射板10来提高发光率和亮度，同时减少耗电量。

Description

液晶显示器的后光发生装置
本发明涉及液晶显示器(LCD)的一种后光发生装置，更具体地说，涉及一种光散射结构经过改进、以提高发光效率的液晶显示器的后光发生装置。
通常，液晶显示器如图1所示，包括：在液晶显示器的两个外表面上的偏振滤光层1；借助于安置在液晶显示器内边缘上的密封材料7形成一个密闭空间的前板2和后板3，密闭空间内充有液晶6；彼此对置着、具有一定图形的透明电极4；和定向层5，它以预定的厚度涂敷在透明电极4的上部分及前板2和后板3的整个内侧上在各透明电极之间露出的部分。
上述液晶显示器不是象阴极射线管或真空荧光显示器之类的那种自行发光的器件，而是象复印那样的非发光性显示器，显示是借助于外来的光进行的。液晶显示器有两种：比如前反射式液晶显示器和透射式液晶显示器，前者利用通过前板2入射的光来显示因液晶排列所产生的预定图形，后者利用后光发生装置从液晶显示器后侧入射的后光进行显示。本发明是对后者(即透射式液晶显示器的后光发生装置)进行改进。
图2示出了普通的透射式液晶显示器后光发生装置的结构。该后光发生装置包括：隔着偏振滤光层1对着液晶显示器后板3底部配置的散射板11；装在散射板11底部的透光板12；装在透光板12底部的反射板13，用以将进入透光板12的光中的散射光反射到散射板11上；安置在透光板12一侧的灯L，用以将光照射到透光板12上。灯L具有总厚度预定的荧光膜和反射膜，灯L本身装在外壳H中。
在上述结构的普通后光发生装置中，灯L照来的光经透光板12入射到散射板11，再由散射板11散射，使其入射到液晶显示器后板中。
但在这种普通的后光发生装置中，入射光只由散射板11加以散射，因而灯L产生的大量光损失掉。因此，由于透过散射板11且入射到后板上的光量小，显示器上看不到亮度足够的图象。这是因为不可能采用具有良好透射系数的散射板来减小图象的这部分亮度差，因而需要有一个解决办法。鉴于一般散射板的透射率约为20-30％，因此，大量的光在散射板中损失掉，减少了显示图象所需要的光量。于是，由于液晶显示器的亮度下降，为补偿亮度，加大加到灯上的功率，从而使图象达到所要求的亮度。但这一下却增加了耗电量。
本发明试图解决上述问题，其目的是提供一种液晶显示器后光发生装置，该装置采用高光透射率的散射板提高灯的入射光利用率，且比普通液晶显示器功耗低。
为达到本发明的上述目的，我们提供了液晶显示器的一种后光发生装置，该装置包括：面向液晶显示器后板的底部的一个散射板；顺序安置在散射板下方的一个透光板和一个反射板；和安置在透光板的一个边缘上，用来发射出光的一个灯，其中，透光板面对散射板的表面相对于散射板如此倾斜，要使装灯一侧的透光板靠近散射板，且随着透光板的表面远离该灯，该表面也远离散射板，而且透光板与散射板之间的空间充有有着预定折射率的散射材料。
图1是普通液晶显示器的正面剖视图。
图2是普通液晶显示器的后光发生装置的示意剖视图。
图3是本发明的液晶显示器后光发生装置的示意剖视图。
图4是本发明另一个实施例的剖视图。
图3示出了本发明的液晶显示器后光发生装置的第一实施例，该后光发生装置包括：隔着偏振滤光层1面对液晶显示器后板3的一个散射板10；其上表面面对散射板10，且按预定角度相对于散射板10倾斜的一个透光板30；安置在透光板30厚度较大的一个边缘上，供照射光用的一个灯L；在透光板30倾斜的上表面与散射板10之间的空间充有的散射材料20；还有一个反射板40，用以将灯L所照射的光当中从透光板30的倾斜面反射的光再反射到散射板10上。这里，透光板30的倾斜面印有花纹，以便吸收灯L来的直接入射光，且该倾斜面随着自身往前远离装灯的位置，偏离散射板10倾斜。此外，还采用折射率大于透光板30的气体、液体和固体作为散射材料20。
图4示出了本发明的另一个实施例，其中，反射板40安置得使其倾斜的方向与透光板30上表面倾斜的方向相反，增大了通过透光板30入射的光的反射角。按照上述结构安装反射板40，亮度比第一实施例的有所提高。在上述结构的液晶显示器后光发生装置中，从灯L入射来的光通过透光板30，然后在倾斜面上无规则地反射，从而使该光有一部分折射到散射材料20上，另一部分反射到反射板40上，然后往上反射再到倾斜面上，进入散射板10中。光在进入散射板10的过程中，它在散射材料20中散射，然后入射到散射板10中，又再次被散射，从而均匀分布地照射到液晶显示器上。这时，光在散射材料20中的折射角小于入射角，因而大量的光进入散射板10中。此外，当采用折射率大的散射材料20时，折射角几乎等于零，于是在散射材料20中折射的光几乎垂直射入散射板10中，从而提高了亮度。
如上所述，液晶显示器后光发生装置中的光经过散射材料20和散射板10两次散射，因而得出亮度均匀的图象。此外，由于光的第一次散射是在散射材料20中进行的，因而有可能采用光透射率比一般散射板高的散射板，从而提高了发光效率。如上所述，既然有可能采用高光透射率的散射板10，因而亮度提高了，从而在功率比普通显示器较低的情况下，可以得出亮度合乎要求的图象。
如上所述，在本发明的液晶显示器后光发生装置中，由于光经过了两次散射(即由散射材料和散射板散射)，因而有可能采用高光透射率的散射板。因此，与普通采用低光透射率散射板的后光发生装置相比，本发明的后光发生装置发光效率高，从而可以得出亮度高的图象，而且降低了功耗。

Claims (4)

1.液晶显示器的一种后光发生装置，包括：面对液晶显示器后板底部的一个散射板；顺序安置在所述散射板下方的一个透光板和一个反射板；和安置在透光板的一个边缘上，供照光之用的一个灯；其特征在于，面对所述散射板(10)的所述透光板(30)的表面相对于所述散射板如此倾斜，要使得在安装灯L的一侧的透光板靠近所述散射板(10)，且随着所述透光板(30)的表面远离所述灯L，所述表面也远离所述散射板(10)，而且所述透光板(30)与所述散射板(10)之间的空间充有有着预定折射率的散射材料(20)。
2.如权利要求1中所述的液晶显示器后光发生装置，其特征在于，所述反射板(40)装配得使其倾斜方向与所述透光板30倾斜面的倾斜方向相反。
3.如权利要求2中所述的液晶显示器后光发生装置，其特征在于，所述散射材料(20)的折射率大于所述透光板(30)的折射率。
4.如权利要求1中所述的液晶显示器后光发生装置，其特征在于，所述散射材料(20)的折射率大于所述透光板(30)的折射率。
CN92102671A 1991-08-24 1992-04-10 液晶显示器的后光发生装置 Expired - Lifetime CN1049742C (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR13616/1991 1991-08-24
KR2019910013616U KR940003349Y1 (ko) 1991-08-24 1991-08-24 액정표시소자의 조명장치
KR13616/91 1991-08-24

Publications (2)

Publication Number Publication Date
CN1070053A CN1070053A (zh) 1993-03-17
CN1049742C true CN1049742C (zh) 2000-02-23

Family

ID=19318327

Family Applications (1)

Application Number Title Priority Date Filing Date
CN92102671A Expired - Lifetime CN1049742C (zh) 1991-08-24 1992-04-10 液晶显示器的后光发生装置

Country Status (6)

Country Link
US (1) US5295048A (zh)
JP (1) JPH0743700U (zh)
KR (1) KR940003349Y1 (zh)
CN (1) CN1049742C (zh)
DE (1) DE4211047A1 (zh)
GB (1) GB2259176B (zh)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5528720A (en) 1992-03-23 1996-06-18 Minnesota Mining And Manufacturing Co. Tapered multilayer luminaire devices
US6002829A (en) * 1992-03-23 1999-12-14 Minnesota Mining And Manufacturing Company Luminaire device
EP0607930B1 (en) * 1993-01-19 2008-11-19 Canon Kabushiki Kaisha Elongate illuminating device and information reading apparatus having said illuminating device
US6426807B1 (en) 1993-01-19 2002-07-30 Canon Kabushiki Kaisha Light guide, illuminating device having the light guide, and image reading device and information processing apparatus having the illuminating device
US5899552A (en) * 1993-11-11 1999-05-04 Enplas Corporation Surface light source device
US5428468A (en) * 1993-11-05 1995-06-27 Alliedsignal Inc. Illumination system employing an array of microprisms
US5396350A (en) * 1993-11-05 1995-03-07 Alliedsignal Inc. Backlighting apparatus employing an array of microprisms
US6129439A (en) * 1993-11-05 2000-10-10 Alliedsignal Inc. Illumination system employing an array of multi-faceted microprisms
US5555329A (en) * 1993-11-05 1996-09-10 Alliesignal Inc. Light directing optical structure
US5521725A (en) * 1993-11-05 1996-05-28 Alliedsignal Inc. Illumination system employing an array of microprisms
US5598281A (en) * 1993-11-19 1997-01-28 Alliedsignal Inc. Backlight assembly for improved illumination employing tapered optical elements
US5982540A (en) 1994-03-16 1999-11-09 Enplas Corporation Surface light source device with polarization function
JP3659975B2 (ja) * 1994-12-01 2005-06-15 セイコーエプソン株式会社 液晶表示素子およびその製造方法
JP3291972B2 (ja) * 1995-05-16 2002-06-17 ソニー株式会社 液晶表示装置およびその製造方法
DE19536825A1 (de) * 1995-09-20 1997-03-27 Dsd Dynamisch Statische Displa Lichtsteuer-Anzeigevorrichtung für transflektiven Betrieb
DE69624774T2 (de) * 1995-12-05 2003-03-27 Matsushita Electric Ind Co Ltd Hintergrundbeleuchtete Farbanzeige
US5838403A (en) * 1996-02-14 1998-11-17 Physical Optics Corporation Liquid crystal display system with internally reflecting waveguide for backlighting and non-Lambertian diffusing
US6072551A (en) * 1996-02-14 2000-06-06 Physical Optics Corporation Backlight apparatus for illuminating a display with controlled light output characteristics
EP0881426B1 (en) * 1996-10-25 2006-01-18 Omron Corporation Surface light source and liquid crystal display, portable telephone and information terminal employing the surface light source
DE19700472A1 (de) 1997-01-09 1998-07-23 Bosch Gmbh Robert Beleuchtungseinheit
US5881201A (en) * 1997-03-11 1999-03-09 Hoechst Celanese Corporation Backlighting lightpipes for display applications
US6151008A (en) * 1997-08-01 2000-11-21 Compaq Computer Corporation Method and apparatus for controlling the brightness of a display screen
US6234656B1 (en) 1998-08-20 2001-05-22 Physical Optics Corporation Fiber optic luminaire
EP1110031B1 (de) * 1998-08-24 2004-06-23 Zumtobel Staff GmbH Leuchte mit lichtleitelement
US6618042B1 (en) 1999-10-28 2003-09-09 Gateway, Inc. Display brightness control method and apparatus for conserving battery power
KR20010066364A (ko) * 1999-12-31 2001-07-11 구본준, 론 위라하디락사 반사형 표시장치
KR100416198B1 (ko) * 2001-11-06 2004-01-31 주식회사 이너텍 Ｌｃｄ 백라이트용 후광장치
KR20050022582A (ko) * 2003-08-27 2005-03-08 제일모직주식회사 광확산판 및 광확산판을 포함하는 액정 표시 장치
CN101836036A (zh) * 2007-08-09 2010-09-15 Nec照明株式会社 照明装置
DE102010018028A1 (de) * 2010-04-23 2011-10-27 Osram Opto Semiconductors Gmbh Flächenlichtleiter und Leuchte
JP5670794B2 (ja) * 2011-03-28 2015-02-18 富士フイルム株式会社 面状照明装置
EP2787276A1 (de) * 2013-04-05 2014-10-08 Flextronics Automotive GmbH & Co. KG Lichtleiteranordnung mit zwei Lichtleiterelementen
US9995866B2 (en) * 2015-01-21 2018-06-12 Laxco Incorporated Uniform illumination lighting module

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823631B2 (ja) * 1976-11-02 1983-05-16 株式会社エコ− 液晶表示時計に於ける光導拡散板
JPS6155684A (ja) * 1984-08-27 1986-03-20 三菱レイヨン株式会社 光拡散装置
US4717690A (en) * 1986-02-12 1988-01-05 Heraeus, Inc. Cermalloy Division Overglaze inks
JPH01131010A (ja) * 1987-11-12 1989-05-23 Sumitomo Metal Ind Ltd 高炉吹込み用微粉炭の製造方法
JP2538667B2 (ja) * 1989-04-13 1996-09-25 富士通株式会社 バックライト
GB2247536B (en) * 1990-08-28 1994-09-07 Brookes & Gatehouse A liquid crystal display
US5146354A (en) * 1991-05-07 1992-09-08 Compaq Computer Corporation LCD system with a backlight having a light source at a light pipe's edge and with the LCD enframed

Also Published As

Publication number Publication date
GB9207784D0 (en) 1992-05-27
KR930005315U (ko) 1993-03-22
CN1070053A (zh) 1993-03-17
JPH0743700U (ja) 1995-09-05
GB2259176B (en) 1995-06-07
KR940003349Y1 (ko) 1994-05-23
GB2259176A (en) 1993-03-03
US5295048A (en) 1994-03-15
DE4211047A1 (de) 1993-02-25

Similar Documents

Publication Publication Date Title
CN1049742C (zh) 液晶显示器的后光发生装置
JP2749012B2 (ja) 液晶表示装置
TWI284229B (en) Backlight assembly and liquid crystal display apparatus having the same
US6369866B1 (en) Liquid crystal display having a light collecting mechanism with a light transmitter optically connected to the light guide plate and light collector for collecting ambient light
CN102901000B (zh) 背光单元和使用该背光单元的显示装置
CN105572787A (zh) 导光板、包括该导光板的背光模组及显示器
US20010004275A1 (en) Liquid-crystal display device
CN215576034U (zh) 背光模组和液晶显示装置
US7064741B2 (en) Light source device, display device and reflection sheets for use therewith
CN103851421A (zh) 背光单元、具有它的液晶显示装置及其制造方法
WO2023160643A9 (zh) 显示模组和显示装置
CN109557719A (zh) 一种具有半反半透导光板的直下式零od背光结构
US6735373B2 (en) Plane light source unit and liquid-crystal display device
CN101414077B (zh) 液晶显示装置
CN1320393C (zh) 光导板、利用该光导板的液晶显示器及其显示图像的方法
CN110196512B (zh) 一种背光模组及显示装置
JPH0432888A (ja) 面光源構造体
CN1337589A (zh) 反射式液晶显示器
CN208888543U (zh) 一种混光均匀的直下式背光模组
KR100627109B1 (ko) 반사형 표시장치
CN2544304Y (zh) 一种导光板结构
JPS5846447Y2 (ja) 液晶表示装置の照明用導光板
CN217213402U (zh) 一种高亮度led背光源
CN2273869Y (zh) 改良的液晶显示幕的背光板
CN220208048U (zh) 一种背光结构

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
C15 Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993)
OR01 Other related matters
C17 Cessation of patent right
CX01 Expiry of patent term

Expiration termination date: 20120410

Granted publication date: 20000223