WO2013189103A1 - 导光板及应用该导光板的侧入式背光模组 - Google Patents

导光板及应用该导光板的侧入式背光模组 Download PDF

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Publication number
WO2013189103A1
WO2013189103A1 PCT/CN2012/078259 CN2012078259W WO2013189103A1 WO 2013189103 A1 WO2013189103 A1 WO 2013189103A1 CN 2012078259 W CN2012078259 W CN 2012078259W WO 2013189103 A1 WO2013189103 A1 WO 2013189103A1
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WO
WIPO (PCT)
Prior art keywords
strip
guide plate
light guide
microstructure
arc
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Application number
PCT/CN2012/078259
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English (en)
French (fr)
Inventor
胡哲彰
贺虎
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/583,630 priority Critical patent/US9612382B2/en
Publication of WO2013189103A1 publication Critical patent/WO2013189103A1/zh

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Classifications

    • 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
    • G02B6/0013—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
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces

Definitions

  • the present invention relates to the field of backlight modules for liquid crystal displays, and more particularly to a light guide plate and a side-lit backlight module using the same. Background technique
  • 3D display functions have gradually become mainstream.
  • common 3D display modes include Shutter Glass and Film-type Patterned Retarder.
  • Shutter-type 3D which needs to be scanned by Scanning Backlight with Panel scanning.
  • the backlight is usually partitioned.
  • a side-lit LED bar is divided into multiple zones. When the first frame of the panel scans the first zone, the LEDs in the first zone are illuminated. Off; When the panel signal is scanned to the second zone, only the LEDs of the second zone are illuminated; the same is true for other zones. This is required for every frame.
  • the effect of the shutter-type 3D display is measured by the crosstalk between the partitions. The lower the crosstalk, the better the display. This crosstalk is mainly determined by the crosstalk between the backlight partitions and the timing design.
  • the crosstalk between the backlight partitions mainly comes from the brightness effect between different partitions. In the best state, when one area is lit, the backlights of the other blocks are dark.
  • Fig. 1 it is a side view of a prior art light guide plate having an upper microstructure.
  • a common design of a sawtooth microstructure as a light guide plate is added to the upper surface (light exit surface) side of the light guide plate.
  • 1 is a view of the light guide plate 10 viewed from the incident side of the light, and the upper surface of the light guide plate 10 has a continuous undulating zigzag upper microstructure.
  • FIG. 4 it is a schematic diagram of the luminance distribution of the light pattern shown in FIG. 3 along the vertical direction.
  • the luminance distribution in the vertical direction is represented by a half-height width (FWHM), and the left side is the light-incident side.
  • FIG. 5 it is a schematic diagram of the width corresponding to the 1/2 brightness of different positions in FIG. 4 as a function of distance.
  • FIG. 6 is a schematic diagram of crosstalk distribution of 9 points on the backlight module using the light guide plate of the upper microstructure in FIG. 3 in the 3D mode.
  • the left side is the light entrance side, and the crosstalk on the high beam side is more serious. Summary of the invention
  • Another object of the present invention is to provide a side-in type backlight module, which reduces crosstalk between partitions and simultaneously reduces crosstalk when scanning backlights, thereby improving the overall 3D display effect.
  • the present invention provides a light guide plate having an upper microstructure on a surface thereof, and a lower microstructure on a lower surface of the light guide plate, wherein the upper and lower microstructures have a plurality of periodic continuous Arranged strip-shaped units, each strip-shaped unit forms a prism, and the strip-shaped units of the upper and lower microstructures are arranged in the same direction.
  • the upper and lower microstructured strip units can be set to different shapes and specifications as needed.
  • the strip-shaped unit of the upper micro-structure has a circular arc shape
  • the strip-shaped unit of the lower micro-structure has a circular arc shape
  • an arc length and a radius of the strip-shaped unit arc of the lower micro-structure are smaller than that of the upper micro-structure
  • the arc length and radius of the strip element arc are smaller than that of the upper micro-structure.
  • the strip-shaped unit of the upper micro-structure has a circular arc shape
  • the strip-shaped unit of the lower micro-structure has a circular arc shape
  • an arc length and a radius of the strip-shaped unit arc of the lower micro-structure and a strip of the upper micro-structure The arc length and radius of the element arc are equal.
  • the strip-shaped unit of the upper microstructure has a circular arc shape
  • the strip-shaped unit of the lower microstructure has a U-shape, which is convexly disposed downward from a lower surface of the light guide plate.
  • the strip-shaped unit of the upper microstructure has a circular arc shape
  • the strip-shaped unit of the lower microstructure has a wave arc shape
  • the upper and lower microstructures are parallel to the direction in which the light emitted by the backlight propagates in the light guide plate.
  • the invention also provides a light guide plate, the surface of the light guide plate is provided with an upper microstructure, the lower surface of the light guide plate is provided with a lower microstructure, and the upper and lower microstructures respectively have a plurality of strips arranged in a periodic continuous manner Unit, each strip unit forms a prism, and rows of upper and lower microstructured strip units The column direction is the same;
  • strip units of the upper and lower microstructures can be set to different shapes and specifications as needed;
  • the strip-shaped unit of the upper micro-structure has a circular arc shape
  • the strip-shaped unit of the lower micro-structure has a circular arc shape
  • an arc length and a radius of the strip-shaped unit arc of the lower micro-structure are smaller than that of the upper micro-structure
  • the arc length and radius of the arc of the strip element of the structure
  • the upper and lower microstructures are parallel to the direction of propagation of light emitted by the backlight in the light guide plate.
  • the invention further provides a side-lit backlight module, comprising: a back plate, a backlight disposed in the back plate, a light guide plate disposed in the back plate corresponding to the backlight, and a reflective sheet disposed on the bottom surface of the light guide plate And an optical film set disposed on a top surface of the light guide plate, wherein the surface of the light guide plate is provided with an upper microstructure, and the lower surface of the light guide plate is provided with a lower microstructure, and the upper and lower microstructures and the light emitted by the backlight
  • the propagation directions in the light guide plate are parallel, and the upper and lower microstructures respectively have a plurality of strip-like units arranged in a periodic manner, each of the strip-shaped units forming a prism, and the arrangement of the strip-shaped units of the upper and lower microstructures The same direction.
  • the strip-shaped unit of the upper micro-structure has a circular arc shape
  • the strip-shaped unit of the lower micro-structure has a circular arc shape
  • the arc length and radius of the strip-shaped unit arc of the lower micro-structure are less than or equal to the upper micro-structure
  • the arc length and radius of the arc of the strip element are less than or equal to the upper micro-structure.
  • the strip-shaped unit of the upper microstructure has a circular arc shape
  • the strip-shaped unit of the lower microstructure has a U-shape, which is convexly disposed downward from a lower surface of the light guide plate.
  • the light guide plate of the present invention enhances the collimation of the light after the LED light source enters the light guide plate by setting a microstructure on both the upper and lower surfaces thereof, and using the combination of the upper microstructure and the lower microstructure to enhance the collimation of the light after the LED light source enters the light guide plate.
  • the convergence characteristic of the light; the side-lit backlight module of the invention is made of the light guide plate, reduces the crosstalk between the partitions, reduces the crosstalk during the backlight scanning, and improves the overall 3D display effect.
  • FIG. 1 is a side view of a light guide plate having an upper microstructure in the prior art; intention;
  • FIG. 3 is a schematic diagram of a light field distribution when a partition of a conventional light guide plate having an upper microstructure is lighted;
  • Figure 4 is a schematic view showing the brightness distribution of the light pattern shown in Figure 3 along the vertical direction;
  • Figure 5 is a schematic diagram showing the variation of the width corresponding to the 1/2 brightness of different positions in Figure 4 as a function of distance;
  • FIG. 6 is a schematic diagram showing crosstalk distribution of 9 points on a backlight module using the light guide plate of the upper microstructure in FIG. 3 in the 3D mode;
  • FIG. 7 is a perspective view of a first preferred embodiment of a light guide plate of the present invention.
  • Figure 8 is a perspective view showing a second preferred embodiment of the light guide plate of the present invention.
  • FIG. 9 is a perspective view of a third preferred embodiment of a light guide plate according to the present invention.
  • FIG. 10 is a perspective view of a fourth preferred embodiment of a light guide plate according to the present invention.
  • FIG. 11 is a perspective view of a side-lit backlight module of the present invention. detailed description
  • the present invention provides a light guide plate 1 .
  • the upper surface of the light guide plate 1 is provided with an upper microstructure 12 .
  • the lower surface of the light guide plate 1 is provided with a lower structure 14 , and the upper and lower structures 12 and 14 .
  • the strip units of the lower microstructures 12 and 14 are arranged in the same direction.
  • the upper microstructure forms the light exiting surface of the light guide plate 1.
  • the upper and lower microstructures 12 and 14 are disposed in parallel with the propagation direction of the light emitted by the backlight in the light guide plate 1 such that one partition includes upper and lower microstructures 12 and 14 strips, and passes through the light guide plate 1
  • the combination of the upper and lower structures 12 and 14 changes the direction of light propagation, which can improve the collimation of light after entering the light guide plate 1 and strengthen the convergence of the light in the light guide plate 1 to constrain the light in a partition. , reduce crosstalk between partitions.
  • the strip units of the upper and lower microstructures 12, 14 can be arranged in different shapes and specifications as needed.
  • the strip-shaped unit of the upper microstructure 12 has a circular arc shape
  • the strip-shaped unit of the lower microstructure 14 has a circular arc shape
  • the arc length and radius of the strip-shaped unit arc of the lower microstructure 14 are both The arc length of the arc of the strip-shaped unit smaller than the upper microstructure 12.
  • FIG. 8 is a perspective view of a second preferred embodiment of a light guide plate according to the present invention.
  • the strip-shaped unit of the upper microstructure 12 has a circular arc shape
  • the strip-shaped unit of the lower microstructure 14 has a circular arc shape
  • the arc length and radius of the strip-shaped unit arc of the lower microstructure 14 It is equal to the strip element arc of the upper microstructure.
  • the strip-shaped unit of the upper microstructure 12 has a circular arc shape, and the strip of the lower microstructure 14"
  • the unit has a U-shape which is convexly disposed downward from the lower surface of the light guide plate 1.
  • FIG. 10 a perspective view of a fourth preferred embodiment of the light guide plate of the present invention, in the embodiment, the strip-shaped unit of the upper microstructure 12 has a circular arc shape, and the lower microstructure 14 The unit is wavy.
  • the strip-shaped unit shapes of the upper and lower microstructures 12 and 14 are all curved, but those skilled in the art can understand that the strip-shaped unit shape structures of the upper and lower microstructures 12 and 14 are The variation of its distribution structure is not limited to the types shown in FIGS. 7 to 10.
  • the present invention further provides a side-lit backlight module, including: a back plate 2 , a backlight 4 disposed in the back plate 2 , and a backlight disposed on the back plate 2 .
  • the inner light guide plate 1 and the reflection sheet 6 disposed on the bottom surface of the light guide plate 1 and the optical film group 8 disposed on the top surface of the light guide plate 1 are provided with an upper microstructure 12 on the upper surface of the light guide plate 1 , the light guide plate 1
  • the lower surface is provided with a lower microstructure 14 which is parallel to the direction of propagation of the light emitted by the backlight in the light guide plate 1.
  • the upper and lower microstructures 12 and 14 respectively have several The strip-shaped cells are periodically arranged in a row, each of which forms a prism, and the strip-shaped cells of the upper and lower microstructures 12, 14 are arranged in the same direction.
  • the upper microstructure forms the light exit surface of the light guide plate 1.
  • the upper and lower microstructures 12 and 14 are disposed in parallel with the propagation direction of the light emitted by the backlight in the light guide plate 1 such that one partition includes upper and lower microstructures 12 and 14 strips, and passes through the light guide plate 1
  • the combination of the upper and lower microstructures 12 and 14 changes the direction of light propagation, which can improve the collimation of light after entering the light guide plate 1 and strengthen the convergence of the light in the light guide plate 1 to constrain the light in a partition. , reduce crosstalk between partitions.
  • the strip units of the upper and lower microstructures 12, 14 can be arranged in different shapes and specifications as needed.
  • the strip-shaped unit of the upper microstructure 12 has a circular arc shape
  • the strip-shaped unit of the lower microstructure 14 has a circular arc shape
  • the arc length and radius of the strip-shaped unit arc of the lower microstructure 14 are less than or equal to The arc length of the strip element arc of the upper microstructure 12.
  • the strip-shaped unit of the upper microstructure 12 has a circular arc shape
  • the strip-shaped unit of the lower microstructure 14 has a U-shape, which is convexly disposed downward from the lower surface of the light guide plate 1.
  • the light guide plate of the present invention increases the collimation of the light after the LED light source enters the light guide plate by setting a microstructure on both the upper and lower surfaces thereof, and utilizing the combination of the upper microstructure and the lower microstructure to enhance the light in the partition.
  • Convergence characteristic; the side-lit backlight module of the invention uses the light guide plate It is made to reduce the crosstalk between partitions, and at the same time reduce the crosstalk during backlight scanning, and improve the overall 3D display.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板及应用该导光板的背光模组，导光板（1）上表面设有上微结构（12），导光板（1）下表面设有下微结构（14），上、下微结构（12，14）与背光源所发出光线在导光板（1）中的传播方向平行，上、下微结构（12，14）分别具有数个呈周期性连续排列的条状单元，每一条状单元形成一棱镜，且上、下微结构（12，14）的条状单元的排列方向相同。导光板（1）通过在其上、下表面均设置微结构（12，14），利用上微结构（12）和下微结构（14）的搭配组合，提升LED光源进入导光板之后光线的准直性，加强分区内光线的收敛特性。一种侧入式背光模组采用导光板（1）制作而成，降低分区之间的串扰，实现背光扫描时串扰的降低，整体提升3D显示的效果。

Description

导光板及应用该导光板的侧入式背光模组 技术领域
本发明涉及液晶显示器的背光模组领域， 尤其涉及一种导光板及应用 该导光板的侧入式背光模组。 背景技术
随着 LED 效率的不断提升， LED 电视背光源的设计也不断演进， 从 最初的四侧入光， 到双侧入光， 再到单侧入光， 目前开发及未来发展的方 向都将指向单短边入光方式。
另外随着 3D技术的发展， 具有 3D显示功能也逐渐成为主流， 目前 常见的 3D显示模式有快门式（Shutter Glass ) , 偏光式（FPR, Film-type Patterned Retarder )等方式。
快门式 3D , 需要通过扫描背光 （ Scanning Backlight ) 搭配面板 ( Panel )像素扫描来实现。 背光源通常会进行分区， 一条侧入式的 LED 灯条（light bar ) 被分成多区， 当面板（panel ) 第一帧信号扫描第一区 时， 第一区的 LED被点亮， 其余区关闭； 当面板（panel )信号扫描到第 二区时， 只有第二区的 LED被点亮； 同理到其他分区。 每帧都需要进行 这样的操作。 快门式 3D显示的效果由分区间的串扰（crosstalk )衡量， 串 扰越低， 显示效果越好。 而此串扰主要取决于背光分区之间的串扰及时序 设计。
背光源分区间的串扰， 主要来自于不同分区之间的亮度影响， 最佳的 状态时， 某一区点亮时， 其余区块的背光源都呈现暗态。 如图 1 所示， 其 为现有技术中具有上微结构的导光板的侧视图。 在导光板的上表面 （出光 面）一侧加入锯齿微结构为导光板的常见设计。 图 1 为从光线入射一侧观 察导光板 10, 导光板 10 的上表面具有连续起伏分布的锯齿形的上微结构
示意图。 然由图 2可看出具有上微结 的导光板 与平板导光板 2^相 比光型较为收敛， 但事实上， 尽管釆用了具有上微结构的导光板 20 光线 会被部分的收敛， 但还是会有一定程度的发散。
随着传播距离的增加， 光型发散的越大， 对其它区域的影响也最大。 如图 3 所示， 为一种常见的具有上微结构的导光板 30 的一个分区点亮时 的光场分布示意图， 当具有上微结构的导光板 30 —个分区点亮时， 随着 距离变化光型会变得较发散。 参见图 4, 其为图 3 所示光型沿着竖直方向 的亮度分布示意图， 竖直方向的亮度分布以半高宽度（FWHM ) 来表示， 左侧为入光侧。 参见图 5 , 其为图 4中不同位置的 1/2 亮度所对应的宽度 随着距离的变化示意图， 在单短边入光方式中， 呈现随着距离增大， 半高 宽度变大的趋势。 即单短边入光时远光侧的串扰较入光侧严重。 参见图 6, 其为在 3D模式下， 使用图 3的具有上微结构的导光板的背光模组上 9 个点的串扰分布示意图。 图 6 中左侧为入光侧， 可见远光侧的串扰较严 重。 发明内容
本发明的目的在于提供一种导光板， 提升光线进入导光板后光线的准 直性， 加强分区内光线的收敛特性。
本发明的另一目的在于提供一种侧入式背光模组， 降低了分区之间的 串扰， 同时实现扫描背光时串扰的降低， 整体提升了 3D显示的效果。
为实现上述目的， 本发明提供一种导光板， 该导光板上表面设有上微 结构， 该导光板下表面设有下微结构， 所述上、 下微结构分别具有数个呈 周期性连续排列的条状单元， 每一条状单元形成一棱镜， 且上、 下微结构 的条状单元的排列方向相同。
所述上、 下微结构的条状单元可以依需要设置成不同的形状与规格。 所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元呈圓弧 形， 所述下微结构的条状单元圓弧的弧长及半径均小于上微结构的条状单 元圓弧的弧长和半径。
所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元呈圓弧 形， 所述下微结构的条状单元圓弧的弧长及半径与上微结构的条状单元圓 弧的弧长和半径相等。
所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元呈 U字 形， 其由导光板的下表面向下凸起设置。
所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元呈波浪 弧形。
所述上、 下微结构与背光源所发出光线在导光板中的传播方向平行。 本发明还提供一种导光板， 该导光板上表面设有上微结构， 该导光板 下表面设有下微结构， 所述上、 下微结构分别具有数个呈周期性连续排列 的条状单元， 每一条状单元形成一棱镜， 且上、 下微结构的条状单元的排 列方向相同；
其中， 所述上、 下微结构的条状单元可以依需要设置成不同的形状与 规格；
其中， 所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元 呈圓弧形， 所述下微结构的条状单元圓弧的弧长及半径均小于上微结构的 条状单元圓弧的弧长和半径；
其中， 所述上、 下微结构与背光源所发出光线在导光板中的传播方向 平行。
本发明还提供一种侧入式背光模组， 包括： 背板、 设于背板内的背光 源、 对应于背光源设置于背板内的导光板、 及设于导光板底面的的反射 片、 及设于导光板顶面的光学膜片组， 所述导光板上表面设有上微结构， 该导光板下表面设有下微结构， 所述上、 下微结构与背光源所发出光线在 导光板中的传播方向平行， 所述上、 下微结构分别具有数个呈周期性连续 排列的条状单元， 每一条状单元形成一棱镜， 且上、 下微结构的条状单元 的排列方向相同。
所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元呈圓弧 形， 所述下微结构的条状单元圓弧的弧长及半径小于或等于上微结构的条 状单元圓弧的弧长和半径。
所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元呈 U字 形， 其由导光板的下表面向下凸起设置。
本发明的有益效果： 本发明导光板通过在其上、 下表面均设置微结 构， 利用上微结构和下微结构的搭配组合， 提升 LED 光源进入导光板之 后光线的准直性， 加强分区内光线的收敛特性； 本发明侧入式背光模组釆 用该导光板制作而成， 降低分区之间的串扰， 同时实现背光扫描时串扰的 降低， 整体提升 3D显示的效果。
为了能更进一步了解本发明的特征以及技术内容， 请参阅以下有关本 发明的详细说明与附图， 然而附图仅提供参考与说明用， 并非用来对本发 明加以限制。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其它有益效果显而易见。
附图中，
图 1为现有技术中具有上微结构的导光板的侧视图； 意图；
图 3 为一种现有常见的具有上微结构的导光板的一个分区点亮时的光 场分布示意图；
图 4为图 3所示光型沿着竖直方向的亮度分布示意图；
图 5为图 4中不同位置的 1/2 亮度所对应的宽度随着距离的变化示意 图；
图 6为在 3D模式下， 使用图 3的具有上微结构的导光板的背光模组 上 9个点的串扰分布示意图；
图 7为本发明导光板第一较佳实施例的立体示意图；
图 8为本发明导光板第二较佳实施例的立体示意图；
图 9为本发明导光板第三较佳实施例的立体示意图；
图 10为本发明导光板第四较佳实施例的立体示意图；
图 11为本发明侧入式背光模组的立体示意图。 具体实施方式
为更进一步阐述本发明所釆取的技术手段及其效果， 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 7, 本发明提供一种导光板 1 , 该导光板 1 上表面设有上微 结构 12, 该导光板 1 下表面设有下啟结构 14, 所述上、 下啟结构 12、 14 与背光源所发出光线在导光板 1 中的传播方向平行， 所述上、 下微结构 12、 14分别具有数个呈周期性连续排列的条状单元， 每一条状单元形成一 棱镜， 且上、 下微结构 12、 14 的条状单元的排列方向相同。 上微结构形 成所述导光板 1 的出光面。 所述上、 下微结构 12、 14 与背光源所发出光 线在导光板 1 中的传播方向平行设置， 使得一个分区包括上、 下微结构 12、 14数条条状单元， 并通过导光板 1 上、 下啟结构 12、 14 的搭配组 合， 改变光线的传播方向， 可以提高光线进入导光板 1 之后光线的准直 性， 加强导光板 1 内光线的收敛特性， 从而把光线约束在一个分区内， 降 低分区间的串扰。
所述上、 下微结构 12、 14 的条状单元可以依需要设置成不同的形状 与规格。 在本实施例中， 上微结构 12 的条状单元呈圓弧形， 下微结构 14 的条状单元呈圓弧形， 所述下微结构 14 的条状单元圓弧的弧长及半径均 小于上微结构 12的条状单元圓弧的弧长。
请参阅图 8 , 本发明导光板第二较佳实施例的立体示意图， 在本实施 例中， 所述上微结构 12的条状单元呈圓弧形， 下微结构 14，的条状单元呈 圓弧形， 所述下微结构 14，的条状单元圓弧的弧长及半径与上微结构的条 状单元圓弧相等。
请参阅图 9, 本发明导光板第三较佳实施例的立体示意图， 在本实施 例中， 所述上微结构 12的条状单元呈圓弧形， 所述下微结构 14"的条状单 元呈 U字形， 其由导光板 1的下表面向下凸起设置。
请参阅图 10, 本发明导光板第四较佳实施例的立体示意图， 在本实施 例中， 所述上微结构 12 的条状单元呈圓弧形， 所述下微结构 14，"的条状 单元呈波浪弧形。
上述具体实施例中， 所述上、 下微结构 12、 14 的条状单元形状皆为 弧形， 但本领域技术人员可以理解， 所述上、 下微结构 12、 14 的条状单 元形状结构及其分布结构的变化不限于图 7至 10所示的几种类型。
请参阅图 11 , 并配合参阅图 7, 本发明还提供一种侧入式背光模组， 包括： 背板 2、 设于背板 2 内的背光源 4、 对应于背光源设置于背板 2 内 的导光板 1、 及设于导光板 1底面的的反射片 6、 及设于导光板 1顶面的 光学膜片组 8, 导光板 1上表面设有上微结构 12, 该导光板 1下表面设有 下微结构 14, 所述上、 下微结构 12、 14 与背光源所发出光线在导光板 1 中的传播方向平行， 所述上、 下微结构 12、 14 分别具有数个呈周期性连 续排列的条状单元， 每一条状单元形成一棱镜， 且上、 下微结构 12、 14 的条状单元的排列方向相同。 上微结构形成所述导光板 1 的出光面。 所述 上、 下微结构 12、 14 与背光源所发出光线在导光板 1 中的传播方向平行 设置， 使得一个分区包括上、 下微结构 12、 14数条条状单元， 并通过导 光板 1 上、 下微结构 12、 14 的搭配组合， 改变光线的传播方向， 可以提 高光线进入导光板 1 之后光线的准直性， 加强导光板 1 内光线的收敛特 性， 从而把光线约束在一个分区内， 降低分区间的串扰。
所述上、 下微结构 12、 14 的条状单元可以依需要设置成不同的形状 与规格。 如： 所述上微结构 12的条状单元呈圓弧形， 下微结构 14的条状 单元呈圓弧形， 所述下微结构 14 的条状单元圓弧的弧长及半径小于或等 于上微结构 12的条状单元圓弧的弧长。 又如： 所述上微结构 12的条状单 元呈圓弧形， 所述下微结构 14的条状单元呈 U字形， 其由导光板 1 的下 表面向下凸起设置。
综上所述， 本发明导光板通过在其上、 下表面均设置微结构， 利用上 微结构和下微结构的搭配组合， 提升 LED 光源进入导光板之后光线的准 直性， 加强分区内光线的收敛特性； 本发明侧入式背光模组釆用该导光板 制作而成， 降低分区之间的串扰， 同时实现背光扫描时串扰的降低， 整体 提升 3D显示的效果。
以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形， 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种导光板， 该导光板上表面设有上微结构， 该导光板下表面设 有下微结构， 所述上、 下微结构分别具有数个呈周期性连续排列的条状单 元， 每一条状单元形成一棱镜， 且上、 下微结构的条状单元的排列方向相 同。
2、 如权利要求 1 所述的导光板， 其中， 所述上、 下微结构的条状单 元可以依需要设置成不同的形状与规格。
3、 如权利要求 2 所述的导光板， 其中， 所述上微结构的条状单元呈 圓弧形， 所述下微结构的条状单元呈圓弧形， 所述下微结构的条状单元圓 弧的弧长及半径均小于上微结构的条状单元圓弧的弧长和半径。
4、 如权利要求 2 所述的导光板， 其中， 所述上微结构的条状单元呈 圓弧形， 所述下微结构的条状单元呈圓弧形， 所述下微结构的条状单元圓 弧的弧长及半径与上微结构的条状单元圓弧的弧长和半径相等。
5、 如权利要求 2 所述的导光板， 其中， 所述上微结构的条状单元呈 圓弧形， 所述下微结构的条状单元呈 U字形， 其由导光板的下表面向下凸 起设置。
6、 如权利要求 2 所述的导光板， 其中， 所述上微结构的条状单元呈 圓弧形， 所述下微结构的条状单元呈波浪弧形。
7、 如权利要求 2 所述的导光板， 其中， 所述上、 下微结构与背光源 所发出光线在导光板中的传播方向平行。
8、 一种导光板， 该导光板上表面设有上微结构， 该导光板下表面设 有下微结构， 所述上、 下微结构分别具有数个呈周期性连续排列的条状单 元， 每一条状单元形成一棱镜， 且上、 下微结构的条状单元的排列方向相 同；
其中， 所述上、 下微结构的条状单元可以依需要设置成不同的形状与 规格；
其中， 所述上微结构的条状单元呈圓弧形， 所述下微结构的条状单元 呈圓弧形， 所述下微结构的条状单元圓弧的弧长及半径均小于上微结构的 条状单元圓弧的弧长和半径；
其中， 所述上、 下微结构与背光源所发出光线在导光板中的传播方向 平行。
9、 一种侧入式背光模组， 包括： 背板、 设于背板内的背光源、 对应 于背光源设置于背板内的导光板、 及设于导光板底面的的反射片、 及设于 导光板顶面的光学膜片组， 所述导光板上表面设有上微结构， 该导光板下 表面设有下微结构， 所述上、 下微结构与背光源所发出光线在导光板中的 传播方向平行， 所述上、 下微结构分别具有数个呈周期性连续排列的条状 单元， 每一条状单元形成一棱镜， 且上、 下微结构的条状单元的排列方向 相同。
10、 如权利要求 9所述的侧入式背光模组， 其中， 所述上微结构的条 状单元呈圓弧形， 所述下微结构的条状单元呈圓弧形， 所述下微结构的条 状单元圓弧的弧长及半径小于或等于上微结构的条状单元圓弧的弧长和半 径。
11、 如权利要求 9所述的侧入式背光模组， 其中， 所述上微结构的条 状单元呈圓弧形， 所述下微结构的条状单元呈 U字形， 其由导光板的下表 面向下凸起设置。
PCT/CN2012/078259 2012-06-21 2012-07-06 导光板及应用该导光板的侧入式背光模组 WO2013189103A1 (zh)

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