WO2012071752A1 - 背光模块及其导光板 - Google Patents

背光模块及其导光板 Download PDF

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Publication number
WO2012071752A1
WO2012071752A1 PCT/CN2010/079750 CN2010079750W WO2012071752A1 WO 2012071752 A1 WO2012071752 A1 WO 2012071752A1 CN 2010079750 W CN2010079750 W CN 2010079750W WO 2012071752 A1 WO2012071752 A1 WO 2012071752A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
prisms
source
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PCT/CN2010/079750
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English (en)
French (fr)
Inventor
张光耀
方扩军
Original Assignee
深圳市华星光电技术有限公司
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Publication of WO2012071752A1 publication Critical patent/WO2012071752A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width 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
    • G02B6/0066—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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention is a backlight module and a light guide plate thereof which provide uniform luminance.
  • the invention relates to a backlight module and a light guide plate thereof, in particular to a prism structure and a direction arrangement of a light guide plate thereof, which can improve the brightness of the backlight module and increase the light propagation distance, and
  • the liquid crystal display needs to further have a backlight module to supply a surface light source with sufficient and uniform distribution of the liquid crystal panel.
  • the backlight module can be mainly divided into a direct type and a side-in type, wherein the light guide plate is a key component of the side-mounted backlight module to provide a uniform surface light source.
  • the light guide plate transmits light entering from the side of the light guide plate to the distal end of the light guide plate by using the principle of total reflection, and the dot pattern on the bottom surface of the light guide plate reflects and diffuses the light to various angles to guide the light guide plate.
  • To the front side of the light guide ie, the light exit surface).
  • the light-emitting surface of the light guide plate can be further provided with a micro-structure combination (micro-structure Array) to improve the uniformity and brightness of the overall light.
  • FIG. 1 is a perspective view showing a conventional prism structure type light guide plate.
  • the light guide plate includes a side light incident surface 90 and a light exit surface 91.
  • the side light incident surface 90 is located at one side of the light guide plate and faces the light source 94 for receiving incident light of the light source 94.
  • the illumination source 94 can be comprised of a plurality of illumination assemblies 940.
  • a light combination 92 is disposed on the light exit surface 91.
  • the microstructure combination 92 is a plurality of elongated prisms 920 (elongated) The prisms are formed side by side, and each of the prisms 920 extends toward an extending direction, wherein the extending direction is perpendicular to a normal direction of a light emitting surface of the light source 94.
  • the microstructure combination 92 destroys the total reflection condition of the incident light, and the light is transmitted from the light exit surface 91.
  • the microstructure combination 92 has the function of concentrating light, the brightness exhibited by the light guide plate can be improved, but the prism structure of the microstructure combination 92 has a periodic change in the direction of light propagation, which will result in a light transmission distance. Reduced. Therefore, when the light guide plate is applied to the large-size backlight module, in order to maintain the brightness of the light guide plate to be uniform, the structural design of the microstructure combination 92 is usually achieved by the following methods: 1. Adjusting the distribution density of the prisms 920 (as shown in FIG. 2), that is, adjusting the pitch P between the prisms 920; 2. adjusting the height H of each of the prisms 920 (as shown in FIG.
  • each of the prisms 920 is adjusted, such as having differently sized rounded corners formed on top of the prism 920, respectively.
  • it is necessary to change the mold and lengthen the product verification time, which leads to an increase in manufacturing cost and difficulty.
  • the main object of the present invention is to provide a light guide plate whose prism structure is uniformly distributed, can increase the light propagation distance and provide uniform brightness, and does not need to change the design of the prism mold for different size panel requirements.
  • a secondary object of the present invention is to provide a backlight module in which the prism structure of the internal light guide plate is uniformly distributed, and the light-emitting distance can be increased by the cooperation of the light-emitting source light-emitting surface and the extending direction of the prism structure, thereby providing uniform brightness. There is no need to change the design of the prism mold for different size panel requirements, and also save the use of optical diaphragms.
  • the present invention provides a light guide plate, the light guide plate comprising:
  • a light incident surface for receiving incident light of a light source
  • a microstructure combination adjacent to the side entrance surface and comprising a plurality of side-by-side elongated prisms, the prisms being parallel to each other, and each of the prisms extending in an extending direction, wherein each of the prisms One end is toward the side entrance surface.
  • the microstructure combination is formed on a light exit surface of the light guide plate.
  • the microstructure combination is formed on a back surface of the light guide plate, and the back surface is a plane adjacent to the side light incident surface and opposite to the light emitting surface of the light guide plate.
  • the light source is located at one side of the light guide plate, and the light emitting surface of the light source faces the side light incident surface of the light guide plate, and the extending direction of each of the prisms is The normal lines of the light-emitting surfaces of the light-emitting sources are parallel.
  • the light source is located at one side of the light guide plate, and the light emitting surface of the light source faces the side light incident surface of the light guide plate, and the extending direction of each of the prisms is The angle between the normals of the light exiting surface of the light source is ⁇ , where - ⁇ /30 ⁇ /30.
  • the illumination source comprises a plurality of side-by-side light emitting diode assemblies.
  • the illumination source comprises at least one cold cathode fluorescent tube.
  • the present invention further provides a backlight module, the backlight module comprising:
  • a light guide plate is disposed on the back plate, the light guide plate includes a side light incident surface, a light emitting surface, and a microstructure combination, wherein the light emitting surface is adjacent to the side light incident surface, and the microstructure combination Adjacent to the side entrance surface and comprising a plurality of side-by-side elongated prisms, the prisms are parallel or nearly parallel to each other, and each of the prisms extends toward an extending direction, wherein one end of each of the prisms is oriented The side entrance surface;
  • An illumination source is disposed on the backplane and located on a side of the light guide plate, and a light emitting surface of the illumination source faces a side light incident surface of the light guide plate.
  • the microstructure combination is formed on a light exit surface of the light guide plate.
  • the microstructure combination is formed on a back surface of the light guide plate, and the back surface is a plane adjacent to the side light incident surface and opposite to the light emitting surface of the light guide plate.
  • each of the prisms extends in a direction parallel to a normal of a light exiting surface of the illumination source.
  • the angle between the extending direction of each of the prisms and the normal of the light-emitting surface of the light source is ⁇ , where - ⁇ /30 ⁇ /30.
  • the illumination source comprises a plurality of side-by-side light emitting diode assemblies.
  • the illumination source comprises at least one cold cathode fluorescent tube.
  • the prism extending direction is perpendicular to the normal direction of the light emitting surface of the light source, although the function of concentrating light can enhance the brightness of the light guide plate, but when applied to a large size panel,
  • the light guide plate must adjust the prism structure to maintain the uniformity of the brightness presented.
  • the invention makes the prism extending direction of the light guide plate almost parallel with the normal direction of the light emitting surface of the light source, and can provide uniform brightness even when the prism structure maintains a uniform distribution, thereby reducing the related mold cost and The use of optical diaphragms.
  • FIG. 1 is a perspective view of a conventional light guide plate combined with a light source.
  • FIG 2 is a schematic side view of another conventional light guide plate combined with a light source.
  • FIG 3 is a schematic side view of still another prior art light guide plate with a light source.
  • FIG. 4 is a perspective view of a light guide plate according to a first embodiment of the present invention.
  • Figure 5 is a side elevational view of Figure 4.
  • Figure 6 is a top plan view of a light guide plate according to a second embodiment of the present invention.
  • Fig. 6A is a partial enlarged view of Fig. 6.
  • Figure 7 is a perspective view of Figure 6.
  • Fig. 8 is a perspective view showing a light guide plate according to a third embodiment of the present invention.
  • FIG. 4 is a perspective view of a light guide plate according to a first embodiment of the present invention
  • FIG. 5 is a side view of FIG.
  • the light guide plate includes a side light incident surface 10, a light exit surface 11 and a microstructure combination 12.
  • the light guide plate is used to cooperate with a light source 13 .
  • the light guide plate and the light source 13 are disposed in a one-side backlight module, wherein the light guide plate is preferably disposed on a back plate of the backlight module.
  • the light guide plate is preferably made of PMMA (polymethyl methacrylate), MS (styrene-methyl methacrylate copolymer), PC (polycarbonate) or PS (polystyrene), but not This limit.
  • the side light incident surface 10 is a side of the light guide plate for receiving incident light of the light source 13 .
  • the light source 13 is disposed on the back plate and located on one side of the light guide plate, and the light emitting surface of the light source 13 faces the side light incident surface 10 of the light guide plate.
  • the illumination source 13 preferably includes a plurality of side-by-side LED assemblies 130 or at least one cold cathode fluorescent tube, but is not limited thereto.
  • the light-emitting surface 11 of the light guide plate is adjacent to the side light-incident surface 10 .
  • the microstructure combination 12 is adjacent to the side light incident surface 10, and is formed on the light exit surface 11 of the light guide plate in the embodiment, and includes a plurality of side by side elongated prisms 120, each of the prisms 120. It extends in an extending direction, wherein one end of each of the prisms 120 faces the side entrance surface 10. In this embodiment, the extending direction of each of the prisms 120 is parallel to the normal of the light emitting surface of the light source 13 . Furthermore, the plurality of side-by-side prisms 120 may be parallel or nearly parallel to each other. If they are nearly parallel, the angle between the diamond lines of each of the two prisms 120 is preferably less than ⁇ /30.
  • the extending direction of the prism 120 is parallel to the normal of the light emitting surface of the light source 13, the total total reflection of the structure of the prism 120 can effectively increase the distance of light incident on the light guide plate.
  • the light guide plate can effectively provide uniform brightness without changing the overall structure of the microstructure combination 12, and can also reduce the use of the optical film. Therefore, the light guide plate of the present invention can be applied to a large-sized panel.
  • the structure of the prism 120 maintains a uniform distribution, the light guide plate will not have to be changed in the mold design in response to the demand of different size panels during the rolling process, and the mold cost can be reduced.
  • FIG. 6 is a top view of the light guide plate according to the second embodiment of the present invention
  • FIG. 6A is a partial enlarged view of FIG. 6
  • FIG. 7 is a perspective view of FIG.
  • the light guide plate of the second embodiment of the present invention is similar to the first embodiment of the present invention, and generally uses the same component name and figure number, but the difference of the second embodiment is that, as shown in FIG. 6A, each of the prisms 120 is The angle between the extending direction 101 and the normal 100 of the light-emitting surface of the light source 13 is ⁇ , where - ⁇ /30 ⁇ ⁇ ⁇ ⁇ / 30. Within this angle range, the structure of the prism 120 can also increase the distance traveled by the light, thereby effectively providing uniform brightness.
  • FIG. 8 is a perspective view of a light guide plate according to a third embodiment of the present invention.
  • the light guide plate according to the third embodiment of the present invention is similar to the first embodiment of the present invention, and substantially uses the same component name and figure number.
  • the difference in the third embodiment is that the microstructure combination 12 is formed on the back surface 14 of the light guide plate, the back surface 14 is a plane, and is adjacent to the side entrance light surface 10 and opposite to the Light surface 11.
  • the prism 120 structure of the microstructure combination 12 can still destroy the total reflection condition on the opposite surface of the light-emitting surface 11 to achieve the purpose of extracting light from the light-emitting surface 11.
  • the prism extending direction is perpendicular to the normal direction of the light emitting surface of the light source, and although the function of concentrating light can enhance the brightness of the light guide plate, the application is to In the case of a large-sized panel, the light guide plate must be adjusted in a prism structure in order to maintain uniform brightness.
  • the invention makes the prism extending direction of the light guide plate almost parallel with the normal direction of the light emitting surface of the light source, and can provide uniform brightness even when the prism structure maintains a uniform distribution, thereby reducing the related mold cost and The use of optical diaphragms.

Description

背光模块及其导光板 技术领域
本发明是有提供均匀辉度的背光模块及其导光板。 关于一种背光模块及其导光板，特别是有关于一种其导光板的棱镜结构及方向布置，可提高背光模块辉度，增加光线传播距离，而
 背景技术
由于液晶显示器的液晶面板不具自主发光的功能，因此液晶显示器需要进一步具备背光模块以供应液晶面板充分且分布均匀的面光源。一般而言，背光模块主要可分成直下式与侧入式两种形态，其中导光板是侧入式的背光模块得以提供均匀面光源的关键元件。导光板是利用全反射的原理将从导光板侧边进入的光线传递至所述导光板的远端，而导光板底面的网点图案则会将所述光线往各个角度反射扩散而将其导引至导光板的正面(亦即出光面)。导光板的出光面可再进一步设置一微结构组合(micro-structure array)，用以提升整体出光的均匀度及辉度。
请参考图1所示，图1是揭示一现有棱镜结构式导光板的立体示意图。所述导光板包含一侧入光面90及一出光面91。所述侧入光面90是位于所述导光板的一侧边，可供面向一发光源94，用以接受所述发光源94的入射光线。所述发光源94可由多个发光组件940组成。所述出光面91上设有一微结构组合92。所述微结构组合92是由多个长条的棱镜920(elongated prism)并排而构成，且每一所述棱镜920是往一延伸方向延伸，其中所述延伸方向与所述发光源94的出光面的法线方向垂直。当光线从所述侧入光面90进入所述导光板后，会通过全反射而在所述导光板内部传递。所述微结构组合92会破坏入射光线的全反射条件，使光线从所述出光面91传递出去。
虽然所述微结构组合92有集中光线的功能，可以提升导光板所呈现的辉度，但是所述微结构组合92的棱镜构造在光线传播方向上具有周期性的变化，将会导致光线传递距离减小。因此当所述导光板应用到大尺寸背光模块时，为使所述导光板所呈现的辉度维持均匀，通常是利用以下几种方式调整所述微结构组合92的结构设计来达成：1.调整所述棱镜920的分布密度(如图2所示)，亦即调整所述棱镜920之间的间距P；2.调整每一所述棱镜920的高度H(如图3所示)；3.调整每一所述棱镜920的几何形状，例如令不同尺寸圆角分别形成于所述棱镜920的顶部。然而，上述几种方式皆必须变更模具，拉长产品验证时间，进而导致制造成本及难度提高。
故，有必要提供一种背光模块及其导光板，以解决现有技术所存在的问题。
 技术问题
本发明的主要目的在于提供一种导光板，其棱镜的结构维持均匀分布，可以增加光线传播距离而提供均匀辉度，不需针对不同尺寸的面板需求而改变棱镜模具的设计。
本发明的次要目的在于提供一种背光模块，其内部导光板的棱镜结构维持均匀分布，通过发光源出光面与棱镜结构延伸方向的配合，可增加光线传播距离，进而提供均匀辉度，故不需针对不同尺寸的面板需求而改变棱镜模具的设计，同时也节省光学膜片的使用。
 技术解决方案
为达成本发明的前述目的，本发明提供一种导光板，所述导光板包含：
一侧入光面，用以接受一发光源的入射光线；
一出光面，邻接所述侧入光面；以及
一微结构组合，是邻接所述侧入光面并包含多个并排的长条棱镜，所述棱镜是彼此平行，且每一所述棱镜是往一延伸方向延伸，其中每一所述棱镜的一端是朝所述侧入光面。
在本发明的一实施例中，所述微结构组合是成形于所述导光板的出光面上。
在本发明的一实施例中，所述微结构组合是成形于所述导光板的一背面，所述背面为一平面，是邻接所述侧入光面且相对于所述导光板的出光面。
在本发明的一实施例中，所述发光源位于所述导光板的一侧边，所述发光源的出光面面向所述导光板的侧入光面，每一所述棱镜的延伸方向与所述发光源的出光面的法线平行。
在本发明的一实施例中，所述发光源位于所述导光板的一侧边，所述发光源的出光面面向所述导光板的侧入光面，每一所述棱镜的延伸方向与所述发光源的出光面的法线之间的夹角为θ，其中-π/30≦θ≦π/30。
在本发明的一实施例中，所述发光源包含多个并排的发光二极管组件。
在本发明的一实施例中，所述发光源包含至少一冷阴极萤光灯管。
本发明另提供一种背光模块，所述背光模块包含：
一背板；
一导光板，设于所述背板上，所述导光板包含一侧入光面、一出光面及一微结构组合，其中所述出光面邻接所述侧入光面，所述微结构组合邻接所述侧入光面并包含多个并排的长条棱镜，所述棱镜是彼此平行或接近平行，且每一所述棱镜是往一延伸方向延伸，其中每一所述棱镜的一端是朝向所述侧入光面；以及
一发光源，设于所述背板上而位于所述导光板一侧边，所述发光源的出光面面向所述导光板的侧入光面。
在本发明的一实施例中，所述微结构组合是成形于所述导光板的出光面上。
在本发明的一实施例中，所述微结构组合是成形于所述导光板的一背面，所述背面为一平面，是邻接所述侧入光面且相对于所述导光板的出光面。
在本发明的一实施例中，每一所述棱镜的延伸方向与所述发光源的出光面的法线平行。
在本发明的一实施例中，每一所述棱镜的延伸方向与所述发光源的出光面的法线之间的夹角为θ，其中-π/30≦θ≦π/30。
在本发明的一实施例中，所述发光源包含多个并排的发光二极管组件。
在本发明的一实施例中，所述发光源包含至少一冷阴极萤光灯管。
 有益效果
相较于现有棱镜结构式导光板的棱镜延伸方向与发光源的出光面的法线方向垂直，虽有集中光线的功能，可以提升导光板所呈现的辉度，但应用到大尺寸面板时，所述导光板必须调整棱镜结构才能使所呈现的辉度维持均匀。本发明令导光板的棱镜延伸方向与发光源的出光面的法线方向几乎平行，可在所述棱镜结构维持均匀的分布下，仍能提供均匀的辉度，因而可减少相关的模具成本及光学膜片的使用。
 附图说明
图1是一现有导光板搭配一发光源的立体示意图。
图2是另一现有导光板搭配一发光源的侧面示意图。
图3是又一现有导光板搭配一发光源的侧面示意图。
图4是本发明第一实施例的导光板的立体示意图。
图5是图4的侧面示意图。
图6是本发明第二实施例的导光板的上视图。
图6A是图6的局部放大图。
图7是图6的立体示意图。
图8是本发明第三实施例的导光板的立体示意图。
 本发明的最佳实施方式
为让本发明上述目的、特征及优点更明显易懂，下文特举本发明较佳实施例，并配合附图，作详细说明如下。再者，本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
请参考图4及图5所示，图4为本发明第一实施例的导光板的立体示意图，图5则为图4的侧面示意图。所述导光板包含有一侧入光面10、一出光面11及一微结构组合12。所述导光板是用以搭配一发光源13使用。所述导光板及所述发光源13用以共同设置于一侧入式背光模块内，其中所述导光板优选是设于所述背光模块的一背板上。所述导光板优选是由PMMA(聚甲机丙烯酸甲酯)、MS(苯乙烯-甲基丙烯酸甲酯共聚物)、PC(聚碳酸酯)或PS(聚苯乙烯)所制成，但不在此限。
所述侧入光面10是所述导光板的一侧边，其用以接受所述发光源13的入射光线。所述发光源13是设于所述背板上而位于所述导光板一侧边，且所述发光源13的出光面面向所述导光板的侧入光面10。所述发光源13优选是包含多个并排的发光二极管组件130或是至少一冷阴极萤光灯管，但不在此限。
所述导光板的出光面11是邻接所述侧入光面10。
所述微结构组合12是邻接所述侧入光面10，本实施例中是成形于所述导光板的出光面11上，并包含多个并排的长条棱镜120，每一所述棱镜120是往一延伸方向延伸，其中每一所述棱镜120的一端是朝所述侧入光面10。本实施例中，每一所述棱镜120的延伸方向与所述发光源13的出光面的法线平行。再者，所述多个并排的棱镜120可以是彼此平行或接近平行，若为接近平行，每两所述棱镜120的菱线之间的夹角优选是小于π/30。
由于所述棱镜120的延伸方向与所述发光源13的出光面的法线平行，利用所述棱镜120的结构的内全反射，将可有效增加入射进所述导光板的光线传播的距离，使得所述导光板不需改变所述微结构组合12的整体结构，即可有效提供均匀的辉度，也可减少光学膜片的使用。因此，本发明的导光板可适用于大尺寸面板。同时，由于所述棱镜120的结构维持均匀的分布，在滚压制程上时所述导光板将不必因应不同尺寸面板的需求而在模具设计上有所变更，可减少模具成本。
请进一步参考图6、图6A及图7所示，图6为本发明第二实施例的导光板的上视图，图6A是图6的局部放大图,图7则为图6的立体示意图。本发明第二实施例的导光板相似于本发明第一实施例，并大致沿用相同组件名称及图号，但第二实施例的差异特征在于：如图6A所示，每一所述棱镜120的延伸方向101与所述发光源13的出光面的法线100之间的夹角为θ，其中-π/30≦θ≦π/30。在此夹角范围内，所述棱镜120的结构同样可增加光线传播的距离，进而有效提供均匀的辉度。
请进一步参考图8所示，图8为本发明第三实施例的导光板的立体图，本发明第三实施例的导光板相似于本发明第一实施例，并大致沿用相同组件名称及图号，但第三实施例的差异特征在于：所述微结构组合12是成形于所述导光板的背面14，所述背面14为一平面，并邻接所述侧入光面10且相对于所述出光面11。所述微结构组合12的棱镜120结构在所述出光面11的相对面仍可破坏全反射条件，达到从所述出光面11取出光线的目的。
综上所述，相较于现有棱镜结构式导光板的棱镜延伸方向与发光源的出光面的法线方向垂直，虽有集中光线的功能，可以提升导光板所呈现的辉度，但应用到大尺寸面板时，所述导光板必须调整棱镜结构才能使所呈现的辉度维持均匀。本发明令导光板的棱镜延伸方向与发光源的出光面的法线方向几乎平行，可在所述棱镜结构维持均匀的分布下，仍能提供均匀的辉度，因而可减少相关的模具成本及光学膜片的使用。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，包含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。
 本发明的实施方式
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Claims (15)

  1. 一种导光板，其特征在于：所述导光板包含：
    一侧入光面，用以接受一发光源的入射光线，所述发光源位于所述导光板一侧边，所述发光源的出光面面向所述导光板的侧入光面；
    一出光面，邻接所述侧入光面；以及
    一微结构组合，是成形于所述导光板的出光面上，所述微结构组合邻接所述侧入光面并包含多个并排的长条棱镜，所述棱镜是彼此平行或接近平行，且每一所述棱镜是往一延伸方向延伸，其中每一所述棱镜的一端是朝向所述侧入光面，且每一所述棱镜的延伸方向与所述发光源的出光面的法线之间具有一夹角为θ，其中-π/30≦θ≦π/30。
  2. 一种导光板，其特征在于：所述导光板包含：
    一侧入光面，用以接受一发光源的入射光线；
    一出光面，邻接所述侧入光面；以及
    一微结构组合，是邻接所述侧入光面并包含多个并排的长条棱镜，所述棱镜是彼此平行或接近平行，且每一所述棱镜是往一延伸方向延伸，其中每一所述棱镜的一端是朝向所述侧入光面。
  3. 如权利要求2所述的导光板，其特征在于：所述微结构组合是成形于所述导光板的出光面上。
  4. 如权利要求2所述的导光板，其特征在于：所述微结构组合是成形于所述导光板的一背面，所述背面为一平面，是邻接所述侧入光面且相对于所述导光板的出光面。
  5. 如权利要求2所述的导光板，其特征在于：所述发光源位于所述导光板一侧边，所述发光源的出光面面向所述导光板的侧入光面，每一所述棱镜的延伸方向与所述发光源的出光面的法线平行。
  6. 如权利要求2所述的导光板，其特征在于：所述发光源位于所述导光板一侧边，所述发光源的出光面面向所述导光板的侧入光面，每一所述棱镜的延伸方向与所述发光源的出光面的法线之间具有一夹角为θ，其中-π/30≦θ≦π/30。
  7. 一种背光模块，其特征在于：所述背光模块包含：
    一背板；
    一导光板，设于所述背板上，所述导光板包含一侧入光面、一出光面及一微结构组合，其中所述出光面邻接所述侧入光面，所述微结构组合是邻接所述侧入光面并包含多个并排的长条棱镜，所述棱镜是彼此平行或接近平行，且每一所述棱镜是往一延伸方向延伸，其中每一所述棱镜的一端是朝向所述侧入光面；以及
    一发光源，设于所述背板上而位于所述导光板一侧边，所述发光源的出光面面向所述导光板的侧入光面。
  8. 如权利要求7所述的背光模块，其特征在于：所述微结构组合是成形于所述导光板的出光面上。
  9. 如权利要求7所述的背光模块，其特征在于：所述微结构组合是成形于所述导光板的一背面，所述背面为一平面，是邻接所述侧入光面且相对于所述导光板的出光面。
  10. 如权利要求7所述的背光模块，其特征在于：每一所述棱镜的延伸方向与所述发光源的出光面的法线平行。
  11. 如权利要求8所述的背光模块，其特征在于：每一所述棱镜的延伸方向与所述发光源的出光面的法线平行。
  12. 如权利要求9所述的背光模块，其特征在于：每一所述棱镜的延伸方向与所述发光源的出光面的法线平行。
  13. 如权利要求7所述的背光模块，其特征在于：每一所述棱镜的延伸方向与所述发光源的出光面的法线之间具有一夹角为θ，其中-π/30≦θ≦π/30。
  14. 如权利要求8所述的背光模块，其特征在于：每一所述棱镜的延伸方向与所述发光源的出光面的法线之间具有一夹角为θ，其中-π/30≦θ≦π/30。
  15. 如权利要求9所述的背光模块，其特征在于：每一所述棱镜的延伸方向与所述发光源的出光面的法线之间具有一夹角为θ，其中-π/30≦θ≦π/30。
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