CN104335087A - 导光板及其制造方法 - Google Patents

导光板及其制造方法 Download PDF

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CN104335087A
CN104335087A CN201280065255.5A CN201280065255A CN104335087A CN 104335087 A CN104335087 A CN 104335087A CN 201280065255 A CN201280065255 A CN 201280065255A CN 104335087 A CN104335087 A CN 104335087A
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guide plate
light guide
passage
light
light source
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杜俊吉
崔官民
张泰甲
李宰勋
金敃廷
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Kolon Industries Inc
Kolon Corp
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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
    • 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
    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

本发明涉及一种导光板及其制造方法，该导光板包括通道，光源可在背光单元组装件内被嵌入所述通道，从而减少光损耗。

Description

导光板及其制造方法
技术领域
本发明涉及用于背光单元(Back Light Unit，BLU)的导光板及其制造方法。
背景技术
用作光学显示装置的液晶显示器是间接发光型显示装置，该显示装置通过调节外部光源的透射率来显示图像，并且包括了作为光源组件的背光单元，该背光单元是决定液晶显示器的特性的重要部件。
背光单元(以下可以被缩写为“BLU”)利用冷阴极荧光灯管(Cold CathodeFluorescent Lamp，CCFL)或发光二极管(Light Emitting Diode，LED)等所发出的光依次通过导光板或扩散板、扩散片以及棱镜片到达液晶板。
因此，在根据背光单元中的光源位置的分类的两种类型中，在光源从侧面发光的边缘型背光单元中使用导光板，用作液晶显示器(LCD)的发光组件。
如图1所示，在边缘型背光单元配置为使得光源20和导光板10彼此以预定间隔分离。当光从光源进入导光板时，一部分光泄漏到导光板外，存在不希望的光量减少的问题。
为解决这个问题，开发了一种液体光源-导光板结构，这种液体光源-导光板结构在导光板的侧面形成槽，在该槽中嵌入光源。但是，这种结构虽然与之前技术相比能够减少光入射单元的光损耗，但是还是因为由于导光板本身的光吸收而存在相对的光损耗。
发明内容
技术问题
相应地，本发明旨在提供一种可以减少从光源供应的光的损耗的导光板及其制造方法。
技术方案
本发明的第一优选实施例提供一种导光板，所述导光板具有通道，所述通道形成为允许光源从侧面方向嵌入，所述导光板包括：通道区域，具有相互隔开的所述通道，其中所述光源嵌入每一个所述通道；以及非通道区域，没有通道。
上述实施例中，可有微细图案形成在所述导光板的底部上。
上述实施例中的所述通道区域和所述非通道区域的宽度分别是所述导光板的整个宽度的40％～70％和30％～60％。
上述实施例中的所述通道的高度是所述导光板的高度的50％～90％。
上述实施例中的所述通道间的间隔可以是3mm～20mm。
本发明的第二优选实施例提供一种导光板的制造方法，包括分别地挤压成型平整的下部板和具有通道的上部板，然后将所述下部板的上侧表面与所述上部板的下侧表面结合。
上述实施例中，可有微细图案形成在所述下部板的所述上侧表面上。
有益效果
根据本发明，能够提供一种具有可嵌入光源的通道的导光板，从而能够减少在传统导光板上发生光损耗的问题，另外，在通道下部形成图案，从而能够有效地提高亮度和亮度均匀度。
附图说明
图1是说明现有背光单元组装件中的光源和导光板；
图2是说明根据本发明的导光板的示意图；
图3是说明根据本发明的导光板的通道的示意图；以及
图4是说明根据本发明的导光板嵌入了光源的状态的示意图。
具体实施方式
下面，将详细描述本发明。
根据本发明的实施例，导光板100上形成有用于从侧面方向嵌入光源200的通道300，该导光板包括：通道区域310，形成有彼此间隔开的通道，并且在每一个通道中嵌入光源；以及非通道区域320，没有通道。
由于光源嵌入到每一个通道的开口一侧使得光从光源入射到导光板，从而因此能够减少传统技术中当光从光源进入导光板时因光源和导光板之间的间隔而产生的光损耗。
此外，传统的导光板，例如由聚甲基丙烯酸甲脂(polymethylmethacrylate，PMMA)树脂制造的导光板，其透光率为93％左右，因而没有通过之剩余的光被导光板本身吸收而发生不希望的光损耗。但是，由于本发明的导光板包括通道，所以导光板不会吸收对应于所述通道的体积的一定的量的光，从而能够减少光损耗。
另一方面，由于在导光板的底部形成有微细图案，所以能够使从光源导入的光向上均匀扩散而提高亮度和亮度均匀度。在此，在当导光板配置为包括平面型的下部板和上部板(包括通道)时，导光板的下部表示下部板的上侧表面。即，可以将在整个上侧表面上形成有微细图案的导光板的下部板和具有通道的上部板结合来制造导光板。
可以根据离光源的距离，使微细图案的密度梯度(density gradient)不同。
此外，微细图案的形状可以是半球形状、金字塔形状、点状以及其它不规则形状等能够引起光的散射的所有形状。在微细图案为半球形状时，其直径可以是20μm～300μm。
如上的微细图案可以通过挤压成型或热冲压成型(Hot Stamping)方式来形成。
上述实施例的通道区域和非通道区域的宽度分别可以是导光板整个宽度的40％～70％和30％～60％。此时，通道区域的宽度与通道的宽度一致。
因此，通道的宽度可以是导光板的宽度的40％～70％。当通道的宽度小于40％时，短的通道很难显着地提高亮度，相反，当超过70％时，因空的空间过大，造成可靠性变差即在高温高湿度下产生翘曲的问题。
此外，通道的高度可以是导光板高度的50％～90％。若通道的高度小于50％，则因较少的光的量而发生光的线性(linearity)较差的问题，当超过90％时，导光板本身的厚度越厚，其与其它光学部件的结合上有可能产生问题。此处，通道的高度是指从通道的底面到顶面的距离。在形成有微细图案的情况下，通道的高度表示从微细图案的底面(即，没有形成微细图案时，与通道的底面相同的面)起到通道的顶面的距离。
可以通过挤压成型来制造导光板。由于可使用挤压模具通过一次成形(oneshot process)来制造形成有双孔类型(double hole type)通道的导光板，从而可以确保能够实现价格竞争力和高亮度。
具体而言，在分别挤压成型平面型的下部板和包括通道的上部板之后，可以将下部板的上侧表面与上部板的下侧表面结合来制造导光板，微细图案可以形成在下部板的整个上表面上。
此外，在包含如上所述的导光板的背光单元组装件的情况下，可以提高亮度和亮度均匀度，能够获得在导光板中嵌入光源的结构，从而有效地减小背光单元组装件本身的大小。
下面，通过具体示例来说明本发明，但是本发明不限于这些示例，并且在本发明的范围内，本发明所属技术领域的技术人员可以做出多种修改。
示例1～示例15及比较例1～比较例15
利用包括双孔方式的模具的挤压机(可以从OMIPA公司获得，意大利)的模具，通过一次成形挤压PMMA树脂(可以从LG MMA获得)来制造具有通道的PMMA导光板。如表1、表2和表3所示，图案形成在导光板的每个通道的底部上。此时，所制造的导光板在光源入射的侧面方向的长度为1200mm，其高度在下面的表1示出。
对示例及比较例中所制造的导光板，按下面的方法测定了相对于通道高度的导光板的亮度和亮度均匀度，其结果在表1中示出。
对示例及比较例中所制造的导光板，按下面的方法测定了相对于通道间隔的导光板的亮度和亮度均匀度，其结果在表2中示出。
对示例及比较例中所制造的导光板，按下面的方法测定了形成于通道底部的不同大小的图案的亮度和亮度均匀度，其结果在表3中示出。
(1)亮度测定
用亮度计(BM-7，可以从日本TOPCON公司获得)，在背光单元的中心部分测量了亮度。
(2)亮度均匀度测定
用亮度计(BM-7，可以从日本TOPCON公司获得)，在相对于BLU的中心部分上部和下部各5个位置共25个位置测量了亮度。以最小亮度/最大亮度，示出了所测量的25个值的均匀度。
【表1】
【表2】
【表3】
从表1显然可以知道，依据光学测量的结果，在通道的高度超过导光板高度的50～90％时，亮度均匀度均匀地保持并且亮度增加。但是，如果导光板形成得太厚，当与其它背光构件之间的结合时，可能产生问题。
此外，从表2显然可以知道，在通道之间的间隔按照表1的亮度成比例的增加时的情况下，因为光的量按照灯的间隔成比例地减少，亮度均匀度和亮度可能会由于缺少光量而导致不合意的变差。
此外，从表3显然可以知道，在底部形成图案的情况下，即，半球型的直径改变时，亮度和亮度均匀度的增加与直径的减少成比例。
虽然已描述了本发明的优选实施例，然而本领域技术人员将明白，还存在于所述实施例等同的其它实施例，本领域技术人员将理解，在不脱离本发明所附权利要求书所公开的本发明的范围和精神的情况下，可以做出多种修改、增加和替换。

Claims (8)

1.一种导光板，所述导光板具有通道，所述通道形成为使光源从侧面方向嵌入，
其中所述导光板包括：
通道区域，具有相互隔开的所述通道，其中所述光源嵌入每一个所述通道；以及
非通道区域，所述非通道区域中没有通道。
2.依据权利要求1所述的导光板，其中，微细图案形成在所述导光板的底部上。
3.依据权利要求1所述的导光板，其中，所述微细图案的大小为20μm～300μm。
4.依据权利要求1所述的导光板，其中，所述通道区域和所述非通道区域的宽度分别是所述导光板的整个宽度的40％～70％和30％～60％。
5.依据权利要求1所述的导光板，其中，所述通道的高度是所述导光板的高度的50％～90％。
6.依据权利要求1所述的导光板，其中，所述通道间的间隔是3mm～20mm。
7.一种制造导光板的方法，包括分别地挤压成型平面型的下部板和具有通道的上部板，然后将所述下部板的上侧表面与所述上部板的下侧表面结合。
8.依据权利要求7所述的制造导光板的方法，其中，微细图案形成在所述下部板的所述上侧表面上。
CN201280065255.5A 2011-12-30 2012-12-06 导光板及其制造方法 Pending CN104335087A (zh)

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