CN106257327A - 面光源模组 - Google Patents
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- CN106257327A CN106257327A CN201610229878.1A CN201610229878A CN106257327A CN 106257327 A CN106257327 A CN 106257327A CN 201610229878 A CN201610229878 A CN 201610229878A CN 106257327 A CN106257327 A CN 106257327A
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- G—PHYSICS
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- 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
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- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- 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
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- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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Abstract
本发明公开了一种面光源模组,其包括导光板、反射片、胶材以及发光组件。导光板具有相邻的入光面与底面,反射片配置于底面,胶材黏着于底面与反射片之间,而发光组件配置于入光面旁。胶材的折射率为N1,导光板的折射率为N2,且63%≦N1/N2≦95%。发光组件包括多个发光元件,各发光元件的配光曲线符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于发光元件的总流明值的10%。此面光源模组具有较佳的光利用效率。
Description
技术领域
本发明涉及一种光源,且特别涉及一种面光源模组。
背景技术
液晶显示装置包括液晶显示面板与背光模组,由于液晶显示面板本身不发光,故需通过背光模组来提供显示光源,以达到显示影像的目的。因此,背光模组所提供的显示光源的品质将会影响影像品质。
背光模组包括直下式背光模组与侧光式背光模组,相较于直下式背光模组,侧光式背光模组因具有厚度较薄的优势,所以目前较被广泛使用于薄型化液晶显示装置中。已知的侧光式背光模组中,光线从导光板的入光面进入导光板后会在导光板内全反射,并通过适当设置的微结构来破坏全反射,以使光线能均匀地从导光板的出光面出射。导光板的底面设置有反射片,以将从底面出射的光线反射回导光板中。反射片是通过胶材黏合于导光板的底面。然而,胶材容易使光线于导光板的底面无法产生全反射,导致光利用效率变差。
本“先前技术”段落只是用来帮助了解本发明内容,因此在“先前技术”中所揭露的内容可能包含一些没有构成所属技术领域中普通技术人员所知道的公知技术。此外,在“先前技术”中所揭露的内容并不代表该内容或者本发明一个或多个实施例所要解决的问题,也不代表在本发明申请前已被所属技术领域中普通技术人员所知晓或认知。
发明内容
本发明提出一种面光源模组,以提升光利用效率。
本发明提出一种面光源模组,以提升光利用效率,且达到薄型化的优点。
本发明的其他目的和优点可以从本发明所揭露的技术特征中得到进一步的了解。
为达上述之一或部分或全部目的或是其他目的,本发明一实施例提出一种面光源模组,其包括导光板、反射片、胶材以及发光组件。导光板具有相邻的入光面与底面,反射片配置于底面,胶材黏着于底面与反射片之间,而发光组件配置于入光面旁。胶材的折射率为N1,导光板的折射率为N2,且63%≦N1/N2≦95%。发光组件包括多个发光元件,各发光元件的配光曲线符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于发光元件的总流明值的10%。
为达上述之一或部分或全部目的或是其他目的,本发明另一实施例提出一种面光源模组,其包括导光板、背板、胶材以及发光组件。导光板具有相邻的入光面与底面,背板承载导光板,其中背板具有用以承载导光板的底壁,且底壁具有面向导光板的反射面。胶材黏着于底面与反射面之间,其中胶材的折射率为N1,导光板的折射率为N2,且63%≦N1/N2≦95%。发光组件配置于入光面旁,且发光组件包括多个发光元件。各发光元件的配光曲线符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于发光元件的总流明值的10%。
本发明各实施例的面光源模组因设计胶材及导光板的折射率的比例关系,且搭配使用具有特定配光曲线的发光元件,所以能有效避免胶材破坏光线于导光板内的全反射,进而提升光利用效率。此外,在一实施例中,由于面光源模组的背板具有反射面,所以能省略已知技术的反射片,进而使面光源模组的整体厚度变薄。
为让本发明的上述和其他目的、特征和优点能更明显易懂,下文特举优选实施例,并配合附图,作详细说明如下。
附图说明
图1是本发明一实施例的面光源模组的示意图。
图2是本发明一实施例的发光元件的配光曲线图。
图3是本发明另一实施例的面光源模组的示意图。
图4是本发明另一实施例的面光源模组的示意图。
图5是本发明另一实施例的面光源模组的示意图。
图6是本发明另一实施例的面光源模组的示意图。
具体实施方式
有关本发明的前述及其他技术内容、特点与功效,在以下配合附图的优选实施例的详细说明中,将可清楚的呈现。以下实施例中所提到的方向用语,例如:上、下、左、右、前或后等,仅是参考附图的方向。因此,使用的方向用语是用来说明并非用来限制本发明。
本发明的面光源模组例如可用于非自发光显示装置(如液晶显示装置),以提供显示光源,但本发明并不限定面光源模组的用途。图1是本发明一实施例的面光源模组的示意图。请参照图1,本实施例的面光源模组100包括导光板110、反射片120、胶材130以及发光组件140。导光板110具有相邻的入光面111与底面112、以及与底面112相对的出光面113,且入光面111连接于底面112与出光面113之间。反射片120配置于底面112,胶材130黏着于底面112与反射片120之间,而发光组件140配置于入光面111旁。发光组件140包括多个发光元件141,而图1仅示出一个发光元件141作为示意。这些发光元件141沿着入光面111的延伸方向排列,以提供光线(未示出)经由入光面111进入导光板110内。
在本实施例中,发光组件140例如还包括电路板142,而发光元件141是设置于电路板142上,并电连接于电路板142,藉以透过电路板142驱使发光元件141发光。光线进入导光板110后可在导光板110的出光面113与底面112之间全反射,而朝向远离发光元件141的方向前进。在出光面113或底面112的至少其中一面可设置用以破坏全反射的微结构(未示出),例如网点,以使光线能从出光面113及底面112出射,但本发明并不限定微结构的形状。从底面112出射的光线可被反射片120反射回导光板110而从出光面113出射,使光线能再次被利用,且可避免漏光。反射片120例如是白反射片或银反射片,但不限于此。另外,微结构的分布方式可依设计需求而定。举例来说,在一实施例中,微结构分布的疏密度例如是从靠近发光组件140的一侧朝远离发光组件140的一侧逐渐变密。此外,面光源模组100可还包括光学膜片150,其配置于导光板110的出光面113上方,用以进一步使光线均匀化,并调整光线的行进方向。光学膜片150可例如为扩散膜、增亮膜(brightness enhancement film,BEF)等,数量可为一片或多片,图1仅示出一个片光学膜片150作为示意,但不限于此。
在本实施例中,由于反射片120是通过胶材130黏合于导光板110的底面112,根据司乃耳定律(Snell’s Law),传递至导光板110底面112的光线能否产生全反射与导光板110及胶材130的折射率以及光线的入射角相关。若光线并非因微结构的关系而是由于光线的入射角的关系(例如光线入射至入光面111的角度过大或光线入射至底面112的角度过小),光线穿出导光板110的底面112,虽然光线会被反射片120反射回导光板110,但穿过胶材130及被反射片120反射时仍会有光损失。为了让光线能够在导光板110内全反射,本实施例设计胶材130与导光板110的折射率以及各发光元件141的配光曲线。具体而言,胶材130的折射率为N1,导光板110的折射率为N2,而折射率N1与N2符合不等式:63%≦N1/N2≦95%。各发光元件141的配光曲线符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于发光元件的总流明值的10%。所述发光元件141的配光曲线表示从发光元件141发出的光线的光强度分布曲线,以中心轴(配光角0度)往左右方向描绘其光强度。在一实施例中,发光元件141的配光曲线可如图2所示,但本发明不限于此,其中图2的横轴为配光角(度),纵轴为光强度(%)。
承上述,设计胶材130及导光板110的折射率N1、N2的关系可以设定临界角(critical angle),而设计各发光元件141的配光曲线可使大部分的光线于导光板110底面112的入射角大于临界角,以产生全反射。因此,当折射率N1、N2及各发光元件141的配光曲线符合上述条件时,可以有效改善胶材130导致光线于导光板110的底面112无法产生全反射的情形,进而提升光利用效率。
在本实施例中,导光板110的材质例如可为聚甲基丙烯酸甲酯(polymethylmethacrylate,PMMA)、聚碳酸酯(polycarbonate,PC)或玻璃等,其中PMMA的折射率约为1.49,PC的折射率约为1.585,而玻璃的折射率约为1.52。此外,胶材130的折射率例如是介于1.3至1.5之间,例如1.4,但本发明并不限于此。若胶材130的折射率低于1.3,则胶材130的成本过高。为了成本考虑,本实施例限定N1/N2≧63%,如此可不需选用折射率过低的胶材130即可满足此条件。若折射率高于1.5,则不易符合N1/N2≦95%的条件。另外,胶材130可选用胶带式的固态透明光学胶(Opticallly Clear Adhesive,OCA),或是由液态胶材固化而成。固态透明光学胶的折射率约为1.45,液态胶材的折射率约介于1.315至1.38之间,液态胶材例如采用Norland型号NOA1315(折射率约为1.315)、NOA132(折射率约为1.32)、NOA133(折射率约为1.33)、NOA1327(折射率约为1.327)、NOA1328(折射率约为1.328)、NOA13685(折射率约为1.3685)、NOA1375(折射率约为1.375)或NOA138(折射率约为1.38)系列胶材。需说明的是,以上所列的导光板110及胶材130的材质仅为举例之用,并非用以限定本发明。
在图1中,各发光元件141例如是发光元件封装结构,如发光二极管封装结构(light emitting diode package structure,LED package structure),但不限于此。发光元件141(或发光元件141的发光面,未示出)与导光板110的入光面111之间的间距例如介于0.3毫米(mm)至0.5毫米之间。发光二极管封装结构例如包括发光晶片(chip,未示出)及用以调整光型的一次光学透镜(first lens,未示出)。然而,若发光二极管封装结构本身的配光曲线无法符合上述条件,可另外增设二次光学透镜(second lens)来调整配光曲线,以符合上述条件。以图3为例,在面光源模组100a中,各发光元件141a包括发光元件封装结构143及二次光学透镜144,其中二次光学透镜144配置于发光元件封装结构143与导光板110的入光面111之间。二次光学透镜144并未与发光元件封装结构143封装为一体,而是与发光元件封装结构143之间存有适当的间距。此外,在另一实施例中,各发光元件141也可例如是激光二极管封装结构(laser diode package structure,LD structure),可提供符合上述条件的配光曲线。
请再参照图1,上述的胶材130可黏着于导光板110的整个底面112,而胶材130可完全覆盖底面112,或是形成分布于底面112的多个胶块,本发明不限于此。然而,若考虑生产效率以及成本及效益,胶材130可局部黏着于导光板110的底面112的邻近发光组件140的区域。以图4的面光源模组100b为例,胶材130b于导光板110的底面112的黏着处例如是邻近于发光组件140。在一实施例中,底面112的黏有胶材130的总面积例如是大于或等于底面112的总面积的10%。所述底面112的黏有胶材130的总面积,表示胶材130在平行底面112的方向上分布于底面112的总面积量。因此,胶材130完全覆盖底面112、局部黏着底面112或是形成分布于底面112的多个胶块都会符合上述条件。
在导光板110中,愈接近发光组件140的区域的光能量愈强,因此将胶材130局部黏着于导光板110的底面112的邻近发光组件140的区域即可有效避免光损失,并防止在导光板110的出光面113的邻近发光组件140的区域出现明显的亮纹。
图5是本发明另一实施例的面光源模组的示意图。请参照图5,本实施例的面光源模组100c与图4的面光源模组100b相似,差异处在于面光源模组100c还包括背板160,而反射片120承载于背板160上,且反射片120位于胶材130b与背板160之间。本实施例的背板160例如具有位于发光组件140及导光板110的入光面111下方的底壁161,且胶材130b的黏着处对应于底壁161。在一实施例中,胶材130b于底壁161的正投影位于底壁161的范围内,并未超出底壁161的范围。此外,背板160例如是由散热性较佳的材质制成,例如铝、铝合金或其他金属。面光源模组100c可还包括胶材170,以黏着背板160与反射片120,其中胶材170的黏性例如是高于胶材130的黏性。在其他实施例中,若反射片120为金属材质,背板160与反射片120可用焊接或螺丝锁附固定。此外,发光组件140例如是承载于背板160的侧壁162。另外,上述的面光源模组100、100a也可包括此背板160。
图6是本发明另一实施例的面光源模组的示意图。请参照图6,本实施例的面光源模组200包括导光板210、胶材230、发光组件240以及背板260。导光板210具有相邻的入光面211与底面212,背板260承载导光板210,其中背板260具有用以承载导光板210的底壁261,且底壁261具有面向导光板210的反射面263。胶材230黏着于底面212与反射面263之间。本实施例的面光源模组200也可进一步包括配置于导光板210上方的光学膜片250。在本实施例中,导光板210、胶材230、发光组件240及光学膜片250与上述的导光板110、胶材130、发光组件140及光学膜片150相似。换言之,胶材230的折射率N1及导光板210的折射率N2也符合不等式:63%≦N1/N2≦95%。发光组件240的各发光元件241的配光曲线也符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于发光元件的总流明值的10%。有关于导光板210、胶材230、发光组件240及光学膜片250的其他细节说明,请参照上述的导光板110、胶材130、发光组件140及光学膜片150的说明,在此不再重述。此外,发光元件241也可替换成类似于图3的的发光元件141a,即包含发光元件封装结构以及配置于发光元件封装结构与入光面211之间的二次光学透镜。
本实施例的面光源模组200因符合上述的条件,所以也具有较佳的光利用效率。此外,由于背板260具有反射面263,用以反射光线,所以能省略上述实施例的反射片120,如此有助于降低面光源模组200的整体厚度,以符合薄型化的趋势。本实施例的背板260的反射面263可为白反射面或银反射面,但不限于此。
综上所述,本发明的实施例可达到下列优点或功效的至少其中之一。本发明各实施例的面光源模组因设计胶材及导光板的折射率的比例关系,且搭配使用具有特定配光曲线的发光元件,所以能有效避免胶材破坏光线于导光板内的全反射,进而提升光利用效率。此外,在一实施例中,由于面光源模组的背板具有反射面,所以能省略已知技术的反射片,进而使面光源模组的整体厚度变薄。
以上所述仅为本发明的优选实施例而已,不能以此限定本发明实施的范围,即大凡依本发明权利要求书及说明书内容所作的简单的等效变化与修改,皆仍属于本发明专利覆盖的范围。另外,本发明的任一实施例或权利要求不须实现本发明所揭露的全部目的或优点或特点。此外,摘要和标题仅是用来辅助专利文件检索之用,并非用来限制本发明的权利范围。
【符号说明】
100、100a、100b、100c、200:面光源模组
110、210:导光板
111、211:入光面
112、212:底面
113:出光面
120:反射片
130、130b、230:胶材
140、240:发光组件
141、141a、241:发光元件
142:电路板
150、250:光学膜片
160、260:背板
161、261:底壁
162:侧壁
170:胶材
263:反射面
Claims (10)
1.一种面光源模组,包括:
一导光板,具有相邻的一入光面与一底面;
一反射片,配置于该底面;
一胶材,黏着于该底面与该反射片之间,其中该胶材的折射率为N1,该导光板的折射率为N2,且63%≦N1/N2≦95%;以及
一发光组件,配置于该入光面旁,该发光组件包括多个发光元件,各该发光元件的配光曲线符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于该发光元件的总流明值的10%。
2.如权利要求1所述的面光源模组,其特征在于,该胶材的折射率介于1.3至1.5之间。
3.如权利要求1所述的面光源模组,其特征在于,该导光板的该底面的黏有该胶材的总面积大于或等于该底面的总面积的10%。
4.如权利要求1所述的面光源模组,其特征在于,该胶材局部黏着于该导光板的该底面,且该胶材于该底面的黏着处邻近于该发光组件。
5.如权利要求4所述的面光源模组,其特征在于,还包括一背板,其中该反射片承载于该背板上,且该反射片位于该胶材与该背板之间。
6.如权利要求1所述的面光源模组,其特征在于,各该发光元件包括一发光元件封装结构。
7.如权利要求6所述的面光源模组,其特征在于,各该发光元件还包括一二次光学透镜,该二次光学透镜配置于该发光元件封装结构与该入光面之间。
8.一种面光源模组,包括:
一导光板,具有相邻的一入光面与一底面;
一背板,承载该导光板,其中该背板具有用以承载导光板的一底壁,且该底壁具有面向该导光板的一反射面;
一胶材,黏着于该底面与该反射面之间,其中该胶材的折射率为N1,该导光板的折射率为N2,且63%≦N1/N2≦95%;以及
一发光组件,配置于该入光面旁,该发光组件包括多个发光元件,各该发光元件的配光曲线符合下列条件:(1)光强度50%处的配光角的绝对值小于或等于55°;(2)绝对值70°以上的配光角的光能量总和小于或等于该发光元件的总流明值的10%。
9.如权利要求8所述的面光源模组,其特征在于,该胶材的折射率介于1.3至1.5之间。
10.如权利要求8所述的面光源模组,其特征在于,该背板的该反射面为一白反射面或一银反射面。
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CN106773210A (zh) * | 2016-12-28 | 2017-05-31 | 深圳市华星光电技术有限公司 | 显示模组 |
CN106597746A (zh) * | 2016-12-31 | 2017-04-26 | 惠科股份有限公司 | 背光模块及显示装置 |
US11067735B2 (en) | 2017-08-29 | 2021-07-20 | Corning Incorporated | Direct-lit backlight unit with 2D local dimming |
CN109656057A (zh) * | 2017-10-11 | 2019-04-19 | 群创光电股份有限公司 | 背光模块及包含其的显示设备 |
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TWI431346B (zh) * | 2010-12-08 | 2014-03-21 | Young Lighting Technology Corp | 導光模組、背光模組與導光模組的製作方法 |
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CN108646465A (zh) * | 2018-03-06 | 2018-10-12 | 友达光电股份有限公司 | 显示装置 |
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TWI530740B (zh) | 2016-04-21 |
US20160370527A1 (en) | 2016-12-22 |
TW201701035A (zh) | 2017-01-01 |
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