CN104459873A - 导光板及包含导光板的背光模组 - Google Patents
导光板及包含导光板的背光模组 Download PDFInfo
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- 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
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- G—PHYSICS
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- 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
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- 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
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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
- 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
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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
- G02B6/0065—Manufacturing aspects; Material aspects
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- G—PHYSICS
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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
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- G—PHYSICS
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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
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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
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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
- 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
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Abstract
本公开提供一种导光板及包含导光板的背光模组。该导光板包含一导光层以及一金属反射层。导光层具有相对的一出光面、一底面以及位于出光面、底面之间的一入光面。导光层于波长范围400纳米至550纳米的平均吸收度大于导光层于波长范围550纳米至700纳米的平均吸收度。金属反射层设置于导光层的底面。金属反射层于波长范围400纳米至550纳米的平均反射率大于金属反射层于波长范围550纳米至700纳米的平均反射率。其中,一光线自入光面进入导光层,光线于底面被金属反射层反射之后,光线自出光面离开导光层。因此,自导光板离开的光的光色较为均匀。
Description
技术领域
本发明涉及一种导光板及包含导光板的背光模组,特别涉及一种具有金属反射层的导光板及包含导光板的背光模组。
背景技术
随着科技的发展,液晶显示装置已大量的应用于笔记本电脑、数码相机、移动电话等各种电子产品中。由于液晶显示装置的液晶显示面板不具发光特性,因此,液晶显示装置需包括一面光源,例如:背光模组,以提供充分且均匀的光线。依据背光源的不同位置的配置,背光模组可分为边光式背光模组和直下式背光模组。一般来说,边光式背光模组包括一导光板、一反射片、一光源与一框体,导光板配置于反射片上方,光源配置于导光板的一侧边,导光板、反射片与光源设置于框体内。
一般而言,是使用光学玻璃作为导光板。然而,由于光学玻璃对于短波长的光线具有较高的吸收度,因而随着与光源的距离的增加,短波长的光线的比例也会随之下降。也就是说,在边光式背光模组中,随着出光位置与光源的距离的增加,所发出的光线中短波长的比例就会下降,因而造成出光时光色不均的问题。
发明内容
鉴于以上的问题,本发明提供一种导光板及包含导光板的背光模组,以解决现有技术中导光板出光时光色不均的问题。
根据本发明一实施例所公开的导光板,包含一导光层以及一金属反射层。导光层具有相对的一出光面、一底面以及位于出光面、底面之间的一入光面。导光层于波长范围400纳米至550纳米的平均吸收度大于导光层于波长范围550纳米至700纳米的平均吸收度。金属反射层设置于导光层的底面。金属反射层于波长范围400纳米至550纳米的平均反射率大于金属反射层于波长范围550纳米至700纳米的平均反射率。其中,一光线自入光面进入导光层,光线于底面被金属反射层反射之后,光线自出光面离开导光层。
根据本发明一实施例所公开的背光模组,包含一导光板以及一光源。导光板的导光层具有相对的一出光面、一底面以及位于出光面、底面之间的一入光面。金属反射层设置于导光层的底面。光源设置于导光层的入光面。
根据上述本发明实施例所公开的导光板及包含导光板的背光模组,由于导光板还具有金属反射层,且金属反射层于波长范围400纳米至550纳米的平均反射率大于金属反射层于波长范围550纳米至700纳米的平均反射率。因此,金属反射层可用以补偿短波长(400纳米至550纳米)的光线,而使得导光板出光时光色较为均匀。如此一来,即解决了现有技术中导光板出光时光色不均的问题。
以上的关于本发明内容的说明及以下的实施方式的说明是用以示范与解释本发明的原理,并且提供本发明的专利申请范围更进一步的解释。
附图说明
图1A为本发明一实施例所公开的背光模组的剖切示意图。
图1B为图1A的背光模组的导光板的剖切示意图。
图1C为光线于图1B的导光板内的路径图。
图2A为钒的反射率与波长的关系图。
图2B为锰的反射率与波长的关系图。
附图标记说明:
10 背光模组
100 导光板
110 导光层
112 出光面
114 底面
116 入光面
118 微结构
120 金属反射层
200 光源
L 光线
具体实施方式
以下在实施方式中详细叙述本发明的详细特征以及优点,其内容足以使任何本领域技术人员了解本发明的技术内容并据以实施,且根据本说明书所公开的内容、权利要求及附图,任何本领域技术人员可轻易地理解本发明相关的目的及优点。以下的实施例是进一步详细说明本发明的观点,但非以任何观点限制本发明的范畴。
首先,请参阅图1A至图1C,图1A为本发明一实施例所公开的背光模组的剖切示意图。图1B为图1A的背光模组的导光板的剖切示意图。图1C为光线于图1B的导光板内的路径图。在本发明叙述中,是以边光式(Edge Lighting)的背光模组10作为举例说明。详细来说,背光模组10包含一导光板100以及一光源200。光源200设置于导光板100。
导光板100包含一导光层110以及一金属反射层120。导光层110具有一相对的一出光面112、一底面114以及位于出光面112与底面114之间的一入光面116。在本实施例中,入光面116面对光源200,并且入光面116的两侧分别连接出光面112及底面114。在本实施例及部分其他实施例中,导光层110另具有一微结构118,微结构118位于导光层110连接金属反射层120的一侧(即,底面114)。微结构118例如是以网点状分布于导光层110的底面114。因此,微结构118可破坏导光层110的全反射,以提升导光层110于出光面112的出光效率。
金属反射层120设置于导光板100的底面114。金属反射层120例如是以蒸镀的方式设置于底面114,但并不以此为限。光源200设置于导光板100的入光面116。亦即,当一光线L(例如光源所发出的光线)自入光面116进入导光层110时,光线L会先在底面114被金属反射层120反射。接着,光线L再从出光面112离开导光层110(如图1C所示)。
导光层110于波长范围400纳米至550纳米的平均吸收度大于导光层110于波长范围550纳米至700纳米的平均吸收度。也就是说,当光线自入光面116进入导光层110时,导光层110对于短波长(即,400纳米至550纳米)的平均吸收度比长波长(即,550纳米至700纳米)的平均吸收度大。导光层110的材质例如为光学玻璃。因此,导光层110会吸收较多短波长的光(例如蓝光),因而随着出光位置与光源200的距离越远,自出光面112离开导光层110的光线中短波长的比例就会下降,而会造成出光时光色不均的现象(例如光色偏红或偏黄)。
为了克服上述导光层110可能潜在的问题,本发明的金属反射层120于波长范围400纳米至550纳米的平均反射率大于金属反射层120于波长范围550纳米至700纳米的平均反射率。如此,金属反射层120可反射、补偿导光层110所吸收的短波长光(例如蓝光),因而使得离开导光板100的光线的光色能较为均匀。
更进一步地,在本实施例及部分其他实施例中,金属反射层120于波长范围400纳米至550纳米的平均反射率相较于金属反射层120于波长范围550纳米至700纳米的平均反射率更可大于1%至5%,如此金属反射层120可解决使用光学玻璃作为导光层110可能造成光色不均的问题。
接着进一步说明金属反射层120的材质。详言之,本发明的金属反射层120的组成元素包含银、第一金属及第二金属。
其中,银是用以将传至底面114的光反射,以避免光线自底面114离开导光层110而降低导光板100的出光效率。第一金属与第二金属则是用以对应补偿导光层110所吸收的特定波长的光。
详细来说,第一金属是选自于钒(IV)及钴所组成的群组。亦即,第一金属例如是蓝色(可反射较多短波长的光线)的金属。因此,第一金属对于短波长的光线(400纳米至550纳米)的吸收度小于长波长的光线(550纳米至700纳米纳米)的吸收度。也就是说,第一金属在波长范围400纳米至550纳米的平均反射率大于波长范围550纳米至700纳米的平均反射率。请参阅图2A,图2A为钒的反射率与波长的关系图。如图所示,钒(IV)在波长范围400纳米至550纳米的平均反射率大于波长范围550纳米至700纳米的平均反射率。
另一方面,本实施例的第二金属则是选自于锰(II)及红铜所组成的群组。即,第二金属例如是红色(可反射较多长波长的光线)的金属。因此,第二金属对于短波长的光线(400纳米至550纳米)的吸收度大于长波长的光线(550纳米至700纳米)的吸收度。也就是说,第二金属在波长范围400纳米至550纳米的平均反射率小于波长范围550纳米至700纳米的平均反射率。请参阅图2B,图2B为锰的反射率与波长的关系图。如图所示,锰(II)在波长范围400纳米至550纳米的平均反射率小于波长范围550纳米至700纳米的平均反射率。因此,第二金属可用以补偿长波长范围的光,以避免第一金属反射过多短波长范围的光(例如蓝光)而造成反效果。亦即,利用第一金属与第二金属的适当的比例搭配而达到较佳的光线补偿结果。
上述金属反射层120于400纳米至550纳米的平均反射率、550纳米至700纳米的平均反射率的数值差异与第一金属(W1)与第二金属(W2)的重量和占金属反射层120的总重量(W)(亦即,(W1+W2)/W)、第一金属的重量与第二金属的重量比值(亦即,W1:W2)相关。因此进一步地,本实施例的第一金属与第二金属的重量和占金属反射层120的总重量的0.15%至4%。第一金属的重量与第二金属的重量的比值介于68:32和96:4之间。当第一金属的重量与第二金属的重量的比值越大时,金属反射层120对于短波长(400纳米至550纳米)的平均反射率越大。当第一金属的重量与第二金属的重量的比值越小时,金属反射层120对于长波长(550纳米至700纳米)的平均反射率越大。亦即,使用者可视导光层的材质特性来调整第一金属与第二金属的重量和占金属反射层120的总重量(即,(W1+W2)/W)、第一金属的重量与第二金属的重量比值(即,W1:W2)。
更佳地,在本实施例及部分其他实施例中,金属反射层120于波长范围400纳米至500纳米的平均反射率大于金属反射层120于波长范围500纳米至600纳米的平均反射率,且金属反射层120于波长范围500纳米至600纳米的平均反射率大于金属反射层120于波长范围600纳米至700纳米的平均反射率。也就是说,金属反射层120的平均反射率会随着波长范围的增加而随之下降。
较佳地,在本实施例及部分其他实施例中,金属反射层120于波长范围400纳米至500纳米的平均反射率相较于金属反射层120于波长范围500纳米至600纳米的平均反射率大0.5%至4%。另一方面,金属反射层120于波长范围500纳米至600纳米的平均反射率相较于金属反射层120于波长范围600纳米至700纳米的平均反射率大0.5%至4%。因此,可进一步改善导光板出光的均匀性。
以下为本发明的实施例一的导光板的材质及光学特性。
下表为本发明的实施例一金属反射层的材质及光学特性。
下表为实施例一的导光板及比较例一的导光板的位置变化与CIE1931色彩空间色度图中x坐标与y坐标的关系。其中,比较例一的导光板与实施例一的导光板的结构差异仅在于比较例一的导光板不具本发明的金属反射层。
以下为本发明的实施例二的导光板的材质及光学特性。
下表为本发明的实施例二的金属反射层的材质及光学特性。
下表为实施例二及比较例二的导光板的位置变化与CIE1931色彩空间色度图中x坐标与y坐标的关系。其中,比较例二的导光板与实施例二的导光板的结构差异仅在于比较例二的导光板不具本发明的金属反射层。
如上表所示,本发明实施例的导光板由于通过金属反射层对于蓝光的补偿,因而可改善现有导光板的色差不均的问题。
根据上述本发明实施例所公开的导光板及包含导光板的背光模组,由于导光板还具有金属反射层,且金属反射层于波长范围400纳米至550纳米的平均反射率大于金属反射层于波长范围550纳米至700纳米的平均反射率。且更佳地,金属反射层于波长范围400纳米至500纳米的平均反射率大于金属反射层于波长范围500纳米至600纳米的平均反射率,且金属反射层于波长范围500纳米至600纳米的平均反射率大于金属反射层于波长范围600纳米至700纳米的平均反射率。因此,金属反射层可用以补偿短波长的光线,而使得导光板出光时光色较为均匀。如此一来,即解决了现有技术中导光板出光时光色不均的问题。
虽然本发明的实施例公开如上所述,然并非用以限定本发明,任何本领域技术人员,在不脱离本发明的精神和范围内,举凡依本发明申请范围所述的形状、构造、特征及精神当可做些许的变更,因此本发明的专利保护范围须视权利要求所界定者为准。
Claims (10)
1.一种导光板,包含:
一导光层,该导光层具有相对的一出光面、一底面以及位于该出光面、该底面之间的一入光面,该导光层于波长范围400纳米至550纳米的平均吸收度大于该导光层于波长范围550纳米至700纳米的平均吸收度;以及
一金属反射层,设置于该导光层的该底面,该金属反射层于波长范围400纳米至550纳米的平均反射率大于该金属反射层于波长范围550纳米至700纳米的平均反射率;
其中,一光线自该入光面进入该导光层,该光线于该底面被该金属反射层反射之后,该光线自该出光面离开该导光层。
2.如权利要求1所述的导光板,其中该金属反射层的组成元素包含银、一第一金属及一第二金属,该第一金属是选自于钴及四价态钒所组成的群组,该第二金属是选自于红铜及二价态锰所组成的群组。
3.如权利要求2所述的导光板,其中该第一金属的重量与该第二金属的重量的比值介于68:32和96:4之间。
4.如权利要求3所述的导光板,其中该第一金属与该第二金属的重量和占该金属反射层的总重量的0.15%至4%。
5.如权利要求1所述的导光板,其中该金属反射层于波长范围400纳米至550纳米的平均反射率相较于该金属反射层于波长范围550纳米至700纳米的平均反射率大1%至5%。
6.如权利要求1所述的导光板,其中该金属反射层于波长范围400纳米至500纳米的平均反射率大于该金属反射层于波长范围500纳米至600纳米的平均反射率,且该金属反射层于波长范围500纳米至600纳米的平均反射率大于该金属反射层于波长范围600纳米至700纳米的平均反射率。
7.如权利要求6所述的导光板,其中该金属反射层于波长范围400纳米至500纳米的平均反射率相较于该金属反射层于波长范围500纳米至600纳米的平均反射率大0.5%至4%。
8.如权利要求6所述的导光板,其中该金属反射层于波长范围500纳米至600纳米的平均反射率相较于该金属反射层于波长范围600纳米至700纳米的平均反射率大0.5%至4%。
9.如权利要求1所述的导光板,其中该导光层另具有一微结构,该微结构位于该导光层的底面。
10.一种背光模组,包含:
一如权利要求1至权利要求9中任一所述的导光板;以及
一光源,设置于该导光层的该入光面。
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