CN101025516A - 背光模组 - Google Patents

背光模组 Download PDF

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Publication number
CN101025516A
CN101025516A CNA2006100339228A CN200610033922A CN101025516A CN 101025516 A CN101025516 A CN 101025516A CN A2006100339228 A CNA2006100339228 A CN A2006100339228A CN 200610033922 A CN200610033922 A CN 200610033922A CN 101025516 A CN101025516 A CN 101025516A
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Prior art keywords
module backlight
optical sheet
light source
light
incidence surface
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章绍汉
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Priority to CNA2006100339228A priority Critical patent/CN101025516A/zh
Priority to US11/521,909 priority patent/US7334920B2/en
Publication of CN101025516A publication Critical patent/CN101025516A/zh
Pending legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

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

Abstract

一种背光模组,其包括光源及光学片,该光学片包括用以接收光束的入光面以及与该入光面相对设置的出光面,该光学片在具出光面的一侧设置有若干阵列排列的倒四棱锥状的凹部,每一凹部包括四个侧壁,该光源用以发出光束,其邻近光学片的入光面设置。所述背光模组可提高出射光亮度,且成本较低。

Description

背光模组
【技术领域】
本发明关于一种背光模组,特别是关于一种用于液晶显示器的背光模组。
【背景技术】
近年来,液晶显示器由于其轻、薄、小与耗电低等特点,得到了广泛应用。由于液晶显示面板本身不具备发光特性,因此需背光模组为其提供背光源,来实现液晶显示面板的显示功能。
背光模组分为侧光式与直下式两种。对于中小尺寸的液晶显示器,侧光式背光模组具有轻、薄及耗电低等优点。然而,随着科技的发展,对大尺寸液晶显示器的需求日趋增多,而侧光式背光模组难以满足大尺寸液晶显示器的亮度要求,因而直下式背光模组迅速发展起来。
请参阅图1,现有技术的直下式背光模组10一般包括:棱镜片11、上扩散片12、下扩散片13及光源15,该上扩散片12、棱镜片11及下扩散片13依序排列,光源15设于下扩散片13的另一侧。该棱镜片11具有入光面111及出光面112,该入光面111邻近下扩散片13,该出光面112具有连续均匀排列的条状棱柱,且邻近上扩散片12。光源15为冷阴极射线管或发光二极管(LED),其发出的光束经下扩散片13散射后射至棱镜片11,经出光面112折射后射至上扩散片12,经上扩散片12散射后射至液晶显示面板。
由于光源15与背光模组10的出光面各处距离不相同,从而会导致出射光亮度不均,因而在光源15与下扩散片13之间通常需设置一扩散板14,以提高出射光的均匀性。
请配合参阅图2,上述直下式背光模组10的扩散板14一般由透明基材141及混入透明基材141的散光物质142构成,散光物质142具有光散射作用,入射光束进入扩散板14,经散光物质142多次散射,提高出射光均匀性。
然而,上述直下式背光模组10因需配置多片光学片而导致较大的光线传输损失,从而使出射光亮度降低,此外为提升光线亮度而采用的棱镜片11,其出光面112的条状棱柱折射效率有限,因而较难满足液晶显示面板的亮度要求。
【发明内容】
鉴于以上内容,有必要提供一种可提高出射光亮度的背光模组。
一种背光模组,其包括光学片及光源,该光学片包括用以接收光束的入光面以及与该入光面相对设置的出光面,该光学片在具出光面的一侧设置有若干阵列排列的倒四棱锥状的凹部,每一凹部包括四个侧壁,该光源用以发出光束,其邻近光学片的入光面设置。
相对于现有技术,所述背光模组在其光学片一侧设置有倒四棱锥状的凹部,光线通过倒四棱锥状的凹部的折射后,可在两个方向将光线折射汇集,因而可提高出射光亮度。
【附图说明】
图1是现有技术的直下式背光模组示意图;
图2是图1的扩散板局部放大示意图;
图3是本发明背光模组第一实施例的立体示意图;
图4是本发明光学片第一实施例的立体示意图;
图5是图4沿V-V线的剖面图;
图6至图7是图5的凹部相邻侧壁处的棱角部分圆角化的放大示意图;
图8是图5的凹部相邻侧壁处的棱角全部圆角化的放大示意图;
图9是本发明背光模组另一实施例的立体示意图;
图10是本发明光学片第二实施例的立体示意图。
【具体实施方式】
请结合参阅图3,其为本发明背光模组的第一实施例。该背光模组20包括光学片21、上扩散片22、下扩散片23及光源24。该上扩散片22、光学片21及下扩散片23依序排列,该光学片21的出光面212邻近上扩散片22,其入光面211邻近下扩散片23,光源24设于下扩散片23的下方。光源24可为冷阴极射线管或发光二极管,在本实施例中,光源24为冷阴极射线管,其发出的光束经下扩散片23散射后射至光学片21,经出光面212折射后射至上扩散片22,经上扩散片22散射后射至液晶显示面板(图未示)。
请参阅图4,在第一实施例中,该光学片21包括基体210、用以接收光束的入光面211以及与该入光面211相对设置的出光面212,该光学片21在具出光面212的一侧设置有以阵列形式均匀排列的若干倒四棱锥状的凹部213,每一凹部213大小相同,并包括两两相对设置的四个侧壁,且相对设置的侧壁的夹角β在45度至135度之间,该侧壁为三角形。
请结合参阅图5,该基体210为方形,其由透明的塑胶材料制成,该入光面211为基体210的一表面,其为一平坦表面。该出光面212为基体210的另一表面,其由若干倒四棱锥状的凹部213构成。通过调整凹部213相对三角形侧壁的夹角大小,可调整该光学片21的增光率及出光视角。另外,为减缓光线在凹部213相邻侧壁处因折射方向突然改变所造成的视角变化,该凹部213相邻侧壁处的棱角可部分圆角化(如图6、图7所示),也可全部圆角化(如图8所示)。
可以理解,根据该光学片21所配置光源的不同,各凹部213也可不均匀排列,而根据光源进行相应配置。
请结合参阅图9及图10,其为本发明第二实施例。该背光模组40与上述第一实施例的光学模组20大致相同,包括光学片41及光源42,该光学片41设置于光源42上方,其入光面411邻近光源42。该光学片41包括基体410、用于接收光束的入光面411以及与该入光面411相对的出光面412,该光学片21在具出光面412的一侧设置有以阵列形式均匀排列的若干倒四棱锥状的凹部413,每一凹部413大小相同,并包括两两相对设置的四个侧壁,且相对设置的侧壁的夹角β在45度至135度之间。不同之处在于,该光学片41的入光面411上进一步设有散射层4110,其具有散射功能。该散射层4110可通过在入光面411上设置粗糙面或涂覆散射性油墨形成。光源42可为冷阴极射线管或发光二极管,在本实施例中,光源42为冷阴极射线管,其发出的光束入射至光学片41的入光面411,经散射层411散射及出光面412折射后射至液晶显示面板(图未示)。
本发明的背光模组20,40的光学片21,41在其出光面一侧设置有若干倒四棱锥状的凹部,通过倒四棱锥状的凹部213,413的折射后,可在两个方向将光线折射汇集,因而可提高出射光亮度。此外,由于背光模组的光学片的入光面上设有散射层,如此可将现有技术中的扩散片、扩散板及棱镜片等制成一整体光学片,光线通过采用该光学片的背光模组时,其能量损失较小,从而进一步提高采用该光学片的背光模组的出射光亮度,并可降低成本。

Claims (8)

1.一种背光模组,其包括光源及光学片,该光学片包括用以接收光束的入光面以及与该入光面相对设置的出光面,其特征在于:该光学片在具出光面的一侧设置有若干阵列排列的倒四棱锥状的凹部,每一凹部包括四个侧壁,该光源用以发出光束,其邻近光学片的入光面设置。
2.如权利要求1所述的背光模组,其特征在于:所述各凹部大小相同,且均匀排列。
3.如权利要求2所述的背光模组,其特征在于:该入光面上设有散射层,该散射层通过设置粗糙面或涂覆散射性油墨形成。
4.如权利要求2所述的背光模组,其特征在于:该侧壁为三角形,且两两相对设置,相对设置的侧壁的夹角在45度至135度之间。
5.如权利要求2所述的背光模组,其特征在于:该凹部相邻侧壁处至少部分棱角圆角化。
6.如权利要求1所述的背光模组,其特征在于:该背光模组还包括上扩散片,该上扩散片设置于邻近该光学片的出光面一侧。
7.如权利要求1所述的背光模组,其特征在于:该背光模组还包括下扩散片,该下扩散片设置于光学片与光源之间,且邻近该光学片的入光面。
8.如权利要求1所述的背光模组,其特征在于:该光源为冷阴极射线管或发光二极管。
CNA2006100339228A 2006-02-23 2006-02-23 背光模组 Pending CN101025516A (zh)

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CNA2006100339228A CN101025516A (zh) 2006-02-23 2006-02-23 背光模组
US11/521,909 US7334920B2 (en) 2006-02-23 2006-09-15 Backlight module

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7726827B2 (en) 2007-11-16 2010-06-01 Hon Hai Precision Industry Co., Ltd. Prism sheet and backlight module using the same
US7753543B2 (en) 2007-09-17 2010-07-13 Hon Hai Precision Industry Co., Ltd. Prism sheet and backlight module using the same
CN101393277B (zh) * 2007-09-17 2010-09-29 鸿富锦精密工业(深圳)有限公司 背光模组及其棱镜片
CN101713518B (zh) * 2008-10-06 2013-02-13 鸿富锦精密工业(深圳)有限公司 照明装置

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JP4678058B2 (ja) * 2009-01-14 2011-04-27 ソニー株式会社 光制御部材、発光装置および表示装置
US8097327B2 (en) * 2009-06-17 2012-01-17 Teh-Zheng Lin Touch panel with an anti-highlight structure
WO2011030594A1 (ja) 2009-09-11 2011-03-17 旭化成イーマテリアルズ株式会社 点光源用光拡散板及び直下型点光源バックライト装置

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US6752505B2 (en) * 1999-02-23 2004-06-22 Solid State Opto Limited Light redirecting films and film systems
US6213625B1 (en) * 1999-04-23 2001-04-10 Nsi Enterprises, Inc. Inverted apex prismatic lens
TW567342B (en) * 2001-04-11 2003-12-21 Au Optronics Corp Microlens implantation type optical plate and the manufacturing method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7753543B2 (en) 2007-09-17 2010-07-13 Hon Hai Precision Industry Co., Ltd. Prism sheet and backlight module using the same
CN101393277B (zh) * 2007-09-17 2010-09-29 鸿富锦精密工业(深圳)有限公司 背光模组及其棱镜片
US7726827B2 (en) 2007-11-16 2010-06-01 Hon Hai Precision Industry Co., Ltd. Prism sheet and backlight module using the same
CN101435885B (zh) * 2007-11-16 2010-09-29 鸿富锦精密工业(深圳)有限公司 背光模组及其棱镜片
CN101713518B (zh) * 2008-10-06 2013-02-13 鸿富锦精密工业(深圳)有限公司 照明装置

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