WO2016155028A1 - 导光板及背光模块 - Google Patents

导光板及背光模块 Download PDF

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Publication number
WO2016155028A1
WO2016155028A1 PCT/CN2015/075932 CN2015075932W WO2016155028A1 WO 2016155028 A1 WO2016155028 A1 WO 2016155028A1 CN 2015075932 W CN2015075932 W CN 2015075932W WO 2016155028 A1 WO2016155028 A1 WO 2016155028A1
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WO
WIPO (PCT)
Prior art keywords
light
incident
guide plate
area
light guide
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2015/075932
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English (en)
French (fr)
Inventor
郑颖博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan China Star Optoelectronics Technology Co Ltd
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Wuhan China Star Optoelectronics Technology Co Ltd
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 Shenzhen China Star Optoelectronics Technology Co Ltd, Wuhan China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/649,556 priority Critical patent/US20170045662A1/en
Publication of WO2016155028A1 publication Critical patent/WO2016155028A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/0013—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
    • 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
    • G02B6/0018—Redirecting means on the surface 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
    • G02B6/0023—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
    • G02B6/0033—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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources

Definitions

  • the present invention relates to the field of backlights, and in particular to a light guide plate and a backlight module.
  • the LED backlight generally has a plurality of LEDs arranged in a row and is packaged in the form of a light bar to form a backlight. Such a package is advantageous for the arrangement of the circuit and the heat dissipation of the backlight.
  • the LED light source 11 is a point light source, so that a bright spot (Hotspot) generally appears on the light incident side of the light guide plate close to the single LED, resulting in poor display.
  • a bright spot Hetspot
  • FIG. 1 is a schematic structural view of a conventional backlight module.
  • the light guide plate 12 can better alleviate the bright spot phenomenon on the light incident side of the light guide plate, but has the following disadvantages:
  • the V-shaped structure 121 causes a decrease in the coupling efficiency of the light guide plate 12, thereby reducing the brightness of the backlight.
  • the V-shaped structure 121 is difficult to process, and cracking often occurs, resulting in poor quality of the light guide plate 12.
  • the object of the present invention is to provide a light guide plate and a backlight module capable of eliminating bright spots, high brightness of a backlight, and simple processing flow, so as to solve the problem that the existing light guide plate and the backlight module have bright spots or backlight brightness. Low technical issues.
  • Embodiments of the present invention provide a light guide plate, including:
  • a conducting portion configured to transmit the incident light after the homogenization treatment to a corresponding liquid crystal display panel
  • the wedge-shaped light entrance portion comprises:
  • a first light guiding surface disposed on an upper side of the light incident surface, comprising a scattering surface for scattering the incident light and a conductive surface for orienting the incident light, the scattering surface being disposed at the a light source bright area of the light guide plate, wherein the conductive surface is disposed in a dark area of the light source of the light guide plate,
  • the bright area of the light source is the area of the light guide plate corresponding to the LED light source area, and the dark area of the light source is the area of the light guide board corresponding to the area between two adjacent LED light sources;
  • the light incident surface is a polished surface
  • the surface of the scattering surface is a polished surface
  • the surface of the conductive surface is provided with a first light conducting microstructure.
  • the embodiment of the invention further provides a light guide plate, comprising:
  • a conducting portion configured to transmit the incident light after the homogenization treatment to a corresponding liquid crystal display panel
  • the wedge-shaped light entrance portion comprises:
  • a first light guiding surface disposed on an upper side of the light incident surface, comprising a scattering surface for scattering the incident light and a conductive surface for orienting the incident light, the scattering surface being disposed at the a light source bright area of the light guide plate, wherein the conductive surface is disposed in a dark area of the light source of the light guide plate,
  • the bright area of the light source is the area of the light guide plate corresponding to the LED light source area
  • the dark area of the light source is the area of the light guide plate corresponding to the area between two adjacent LED light sources.
  • the surface of the scattering surface is a polishing surface
  • the surface of the conductive surface is provided with a first light-conducting microstructure.
  • the first light guiding surface is perpendicular to the light incident surface.
  • the first light-conducting microstructure is perpendicular to the light-incident surface.
  • the first light-conducting microstructure has a microstructure pore size of less than 50 ⁇ m.
  • the wedge-shaped light incident portion further includes:
  • a second light guiding surface disposed on an upper side of the light incident surface and disposed between the first light guiding surface and the conductive portion, wherein a surface of the second light guiding surface is provided for The incident light of the bright region of the light source is directed to a second light conducting microstructure of the dark region of the light source.
  • the second light guiding surface forms an acute angle with the light incident surface.
  • the second light-conducting microstructure has a microstructure aperture of less than 50 micrometers.
  • the light incident surface is a polished surface.
  • the embodiment of the invention further provides a backlight module, which comprises an LED light source and a light guide plate, wherein the light guide plate comprises:
  • a conducting portion configured to transmit the incident light after the homogenization treatment to a corresponding liquid crystal display panel
  • the wedge-shaped light entrance portion comprises:
  • a first light guiding surface disposed on an upper side of the light incident surface, comprising a scattering surface for scattering the incident light and a conductive surface for orienting the incident light, the scattering surface being disposed at the a light source bright area of the light guide plate, wherein the conductive surface is disposed in a dark area of the light source of the light guide plate,
  • the bright area of the light source is the area of the light guide plate corresponding to the LED light source area
  • the dark area of the light source is the area of the light guide plate corresponding to the area between two adjacent LED light sources.
  • the surface of the scattering surface is a polishing surface
  • the surface of the conductive surface is provided with a first light-conducting microstructure.
  • the first light guiding surface is perpendicular to the light incident surface.
  • the first light-conducting microstructure is perpendicular to the light-incident surface.
  • the first light-conducting microstructure has a microstructure aperture of less than 50 micrometers.
  • the wedge-shaped light incident portion further includes:
  • a second light guiding surface disposed on an upper side of the light incident surface and disposed between the first light guiding surface and the conductive portion, wherein a surface of the second light guiding surface is provided for The incident light of the bright region of the light source is directed to a second light conducting microstructure of the dark region of the light source.
  • the second light guiding surface forms an acute angle with the light incident surface.
  • the second light-conducting microstructure has a microstructure aperture of less than 50 micrometers.
  • the second light-conducting microstructure has a microstructure aperture of less than 50 micrometers.
  • the light guide plate and the backlight module of the present invention are uniformized by the first light guide facing the incident light, and the bright spot phenomenon can be eliminated on the basis of maintaining the brightness of the backlight.
  • the processing flow is simple; the existing light guide plate and the backlight module have the technical problem of bright spot phenomenon or low brightness of the backlight.
  • FIG. 1 is a schematic structural view of a conventional backlight module
  • FIG. 2A is a top plan view of a preferred embodiment of a backlight module of the present invention.
  • Figure 2B is a cross-sectional view taken along line A-A' of Figure 2A;
  • FIG 3 is a side elevational view of a preferred embodiment of a backlight module of the present invention.
  • FIG. 2A is a top plan view of a preferred embodiment of a light guide plate of the present invention
  • FIG. 2B is a cross-sectional view taken along line A-A' of FIG. 2A
  • the backlight module 20 of the preferred embodiment includes an LED light source 21 and a light guide plate.
  • the light guide plate includes a wedge-shaped light incident portion 22 and a conductive portion 23; the wedge-shaped light incident portion 22 is for homogenizing the incident light, and the conductive portion 23 is for transmitting the uniformized processed incident light to the corresponding liquid crystal display panel.
  • the wedge-shaped light incident portion 22 includes a light incident surface 221 , a first light guiding surface 222 , and a second guiding surface 223 .
  • the light incident surface 221 is configured to receive the incident light.
  • the light incident surface 221 is preferably a polished surface.
  • the first light guiding surface 222 can be disposed on the upper side of the light incident surface 221.
  • the first light guiding surface 222 is disposed on the upper surface of the light incident surface 221.
  • a scattering surface 2221 for scattering incident light and a conductive surface 2222 for directional conduction of incident light are included.
  • the scattering surface 2221 is disposed in the light source bright area of the light guide plate, and the conductive surface 2222 is disposed in the dark area of the light source of the light guide plate, wherein the bright area of the light source is the area of the light guide plate corresponding to the area of the LED light source 21, and the dark area of the light source is the adjacent two LEDs.
  • the area of the light guide plate corresponding to the area between the light sources 21.
  • the second light guiding surface 223 is also disposed on the upper side of the light incident surface 221, and is disposed between the first light guiding surface 222 and the conductive portion 23, and the surface of the second light guiding surface 223 is provided with an incident surface for brightening the light source.
  • the light is directed to the second light conducting microstructure 2231 of the dark region of the source.
  • first light guiding surface 222 and the second light guiding surface 223 may be disposed on the lower side of the light incident surface 221 or at the same time on the upper side and the lower side of the light incident surface 221 .
  • the surface of the scattering surface 2221 of the first light guiding surface 222 of the light guide plate of the backlight module 20 of the preferred embodiment is a polishing surface, which is more advantageous for scattering of incident light corresponding to the bright area of the light source; the conductive surface of the first light guiding surface 222
  • the surface of the 2222 is provided with a first light-conducting microstructure 2223.
  • the arrangement of the first light-conducting microstructure 2223 is more advantageous for the incident light of the dark region of the light source to be conducted along the extending direction of the first light-conducting microstructure 2223.
  • the first light guiding surface 222 is perpendicular to the light incident surface, and the first light conducting microstructure 2223 on the surface of the first light guiding surface 222 is perpendicular to the light incident surface.
  • the first light-conducting microstructure 2223 has a microstructure aperture of less than 50 microns.
  • the second light-conducting microstructure 2231 of the second light guiding surface 223 of the light guiding plate of the backlight module 20 of the preferred embodiment can conduct incident light along the extending direction of the second light-conducting microstructure 2231, thereby realizing the light source bright region.
  • the incident light is directed to the dark region of the source.
  • the second light guiding surface 223 forms an acute angle with the light incident surface 221 to facilitate the concentrating operation, and at the same time, to ensure the guiding property of the second light conducting microstructure 2231, the second light conducting microstructure 2231
  • the microstructure pore size is less than 50 microns.
  • the specific structure is shown in FIG. 3.
  • the first light-conducting microstructure 2223 and the second light-conducting microstructure 2231 are not shown in FIG.
  • the light emitted from the LED light source 21 is formed by the distribution problem of the LED light source 21, and the light guide plate region corresponding to the LED light source 21 region is set as the light source bright region, and the adjacent LED light source 21 is used.
  • the area of the light guide plate corresponding to the area between them is set as the dark area of the light source.
  • the first light guide surface 222 of the wedge-shaped light incident portion 22 of the light guide plate homogenizes the incident light, wherein the scattering surface of the first light guide surface 222 2221 is disposed in the bright area of the light source of the light guide plate, which can scatter the incident light in the bright area of the light source, thereby reducing the incident light in the bright area of the light source and increasing the incident light in the dark area of the light source; the conductive surface 2222 of the first light guiding surface 222
  • the first light-conducting microstructure 2223 on the conductive surface 2222 can be disposed in the dark region of the light source of the light guide plate to ensure that the incident light in the dark region of the light source does not scatter, thereby further reducing the incident light in the dark region of the light source. Therefore, after passing through the first light guiding surface, the brightness uniformity of the incident light of the light guiding plate is improved.
  • the second light guiding surface 223 of the wedge-shaped light incident portion 22 of the light guide plate further performs uniform processing on the incident light, and the second light conducting microstructure 2231 on the second light guiding surface 223 can effectively inject the bright region of the light source.
  • the light is directionally transmitted to the dark area of the light source of the light guide plate, thereby further reducing the incident light of the bright area of the light source, increasing the incident light of the dark area of the light source, and further improving the brightness uniformity of the incident light of the light guide plate.
  • the second light guiding surface 223 forms an acute angle with the light incident surface 221, so that the incident light after the uniformization can be concentrated, thereby further improving the brightness of the backlight.
  • the arrangement of the first light guiding surface 222 and the second light guiding surface 223 of the wedge-shaped light incident portion 22 of the light guide plate of the backlight is excellent for uniformizing the incident light, thereby avoiding the occurrence of a bright spot phenomenon.
  • the cross section of the first light conducting microstructure 2223 of the first light guiding surface 222 and the second light conducting microstructure 2231 of the second light guiding surface 223 may be triangular, circular arc shaped or other shape that limits light scattering. In this way, the light-incident surface of the light guide plate can be polished surface with improved coupling efficiency without setting a V-shaped structure to avoid bright spots.
  • the light guide plate and the backlight module of the present invention are homogenized by the first light guiding surface and the second light guiding surface to face the incident light, thereby eliminating the bright spot phenomenon on the basis of maintaining the brightness of the backlight, and the processing flow is simple;
  • the existing light guide plate and the backlight module have the technical problem of bright spot phenomenon or low backlight brightness.

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

Abstract

一种导光板及背光模块，该导光板包括楔形入光部（22）以及传导部（23）；楔形入光部（22）包括入光面（221）以及第一光导向面（222）；第一光导向面（222）设置在入光面（221）的上侧面，其包括用于散射入射光的散射面（2221）以及用于定向传导入射光的传导面（2222），散射面（2221）设置在光源亮区，传导面（2222）设置在光源暗区。

Description

导光板及背光模块 技术领域
本发明涉及背光领域，特别是涉及一种导光板及背光模块。
 背景技术
随着显示技术的发展，LED背光源已经逐渐成为显示装置中的主流背光源。该LED背光源一般是将多颗LED成行排列，以灯条的形式进行封装，从而形成背光源。这样的封装方式有利于电路的排布以及背光源的散热。
但是LED光源11为点光源，这样靠近单颗LED的导光板入光侧一般会出现放射状的亮斑（Hotspot），造成显示不良。
为了减轻亮斑现象，设计者在导光板12的入光面上设置若干V型结构121，如图1所示，图1为现有的背光模块的结构示意图。这种导光板12可以较好的减轻导光板入光侧的亮斑现象，但是其具有以下缺点：
一、V型结构121造成导光板12的耦光效率的降低，从而降低了背光源的亮度。
二、V型结构121加工难度较大，经常出现崩裂现象，造成导光板12品质不良。
故，有必要提供一种导光板及背光模块，以解决现有技术所存在的问题。
 技术问题
本发明的目的在于提供一种可消除亮斑现象、背光源的亮度较高以及加工流程简单的导光板以及背光模块；以解决现有的导光板以及背光模块具有亮斑现象或背光源亮度较低的技术问题。
 技术解决方案
本发明实施例提供一种导光板，其包括：
楔形入光部，用于对入射光进行均匀化处理；以及
传导部，用于将均匀化处理后的所述入射光传输至相应的液晶显示面板；
其中所述楔形入光部包括：
入光面，用于接收所述入射光；以及
第一光导向面，设置在所述入光面的上侧面，其包括用于散射所述入射光的散射面以及用于定向传导所述入射光的传导面，所述散射面设置在所述导光板的光源亮区，所述传导面设置在所述导光板的光源暗区，
其中所述光源亮区为LED光源区域对应的所述导光板的区域，所述光源暗区为相邻的两个所述LED光源之间区域对应的所述导光板的区域；
其中所述入光面为抛光面，所述散射面的表面为抛光面，所述传导面的表面设置有第一光传导微结构。
本发明实施例还提供一种导光板，其包括：
楔形入光部，用于对入射光进行均匀化处理；以及
传导部，用于将均匀化处理后的所述入射光传输至相应的液晶显示面板；
其中所述楔形入光部包括：
入光面，用于接收所述入射光；以及
第一光导向面，设置在所述入光面的上侧面，其包括用于散射所述入射光的散射面以及用于定向传导所述入射光的传导面，所述散射面设置在所述导光板的光源亮区，所述传导面设置在所述导光板的光源暗区，
其中所述光源亮区为LED光源区域对应的所述导光板的区域，所述光源暗区为相邻的两个所述LED光源之间区域对应的所述导光板的区域。
在本发明所述的导光板中，所述散射面的表面为抛光面，所述传导面的表面设置有第一光传导微结构。
在本发明所述的导光板中，所述第一光导向面垂直于所述入光面。
在本发明所述的导光板中，所述第一光传导微结构垂直于所述入光面。
在本发明所述的导光板中，所述第一光传导微结构的微结构孔径小于50微米。
在本发明所述的导光板中，所述楔形入光部还包括：
第二光导向面，设置在所述入光面的上侧面，并设置在所述第一光导向面以及所述传导部之间，所述第二光导向面的表面设置有用于将所述光源亮区的所述入射光定向传导至所述光源暗区的第二光传导微结构。
在本发明所述的导光板中，所述第二光导向面与所述入光面形成一锐角。
在本发明所述的导光板中，所述第二光传导微结构的微结构孔径小于50微米。
在本发明所述的导光板中，所述入光面为抛光面。
本发明实施例还提供一种背光模块，其包括LED光源以及导光板，其中所述导光板包括：
楔形入光部，用于对入射光进行均匀化处理；以及
传导部，用于将均匀化处理后的所述入射光传输至相应的液晶显示面板；
其中所述楔形入光部包括：
入光面，用于接收所述入射光；以及
第一光导向面，设置在所述入光面的上侧面，其包括用于散射所述入射光的散射面以及用于定向传导所述入射光的传导面，所述散射面设置在所述导光板的光源亮区，所述传导面设置在所述导光板的光源暗区，
其中所述光源亮区为LED光源区域对应的所述导光板的区域，所述光源暗区为相邻的两个所述LED光源之间区域对应的所述导光板的区域。
在本发明所述的背光模块中，所述散射面的表面为抛光面，所述传导面的表面设置有第一光传导微结构。
在本发明所述的背光模块中，所述第一光导向面垂直于所述入光面。
在本发明所述的背光模块中，所述第一光传导微结构垂直于所述入光面。
在本发明所述的背光模块中，所述第一光传导微结构的微结构孔径小于50微米。
在本发明所述的背光模块中，所述楔形入光部还包括：
第二光导向面，设置在所述入光面的上侧面，并设置在所述第一光导向面以及所述传导部之间，所述第二光导向面的表面设置有用于将所述光源亮区的所述入射光定向传导至所述光源暗区的第二光传导微结构。
在本发明所述的背光模块中，所述第二光导向面与所述入光面形成一锐角。
在本发明所述的背光模块中，所述第二光传导微结构的微结构孔径小于50微米。
在本发明所述的背光模块中，所述第二光传导微结构的微结构孔径小于50微米。
 有益效果
相较于现有的导光板以及背光模块，本发明的导光板以及背光模块通过第一光导向面对入射光进行均匀化处理，可在保持背光源的亮度的基础上，消除亮斑现象，且加工流程简单；解决了现有的导光板以及背光模块具有亮斑现象或背光源亮度较低的技术问题。
 附图说明
图1为现有的背光模块的结构示意图；
图2A为本发明的背光模块的优选实施例的俯视结构图；
图2B为沿图2A的A-A’截面线的截面图；
图3为本发明的背光模块的优选实施例的侧视结构图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。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。
在图中，结构相似的单元是以相同标号表示。
请参照图2A、图2B以及图3，图2A为本发明的导光板的优选实施例的俯视结构图；图2B为沿图2A的A-A’截面线的截面图；图3为本发明的导光板的优选实施例的俯视结构图。本优选实施例的背光模块20包括LED光源21以及导光板。该导光板包括楔形入光部22以及传导部23；楔形入光部22用于对入射光进行均匀化处理，传导部23用于将均匀化处理后的入射光传输至相应的液晶显示面板。
其中楔形入光部22包括入光面221、第一光导向面222以及第二导向面223。入光面221用于接收入射光，为了保证入光效果，该入光面221优选为抛光面；第一光导向面222可设置在入光面221的上侧面，该第一光导向面222包括用于散射入射光的散射面2221以及用于定向传导入射光的传导面2222。散射面2221设置在导光板的光源亮区，传导面2222设置在导光板的光源暗区，其中光源亮区为LED光源21区域对应的导光板的区域，光源暗区为相邻的两个LED光源21之间区域对应的导光板的区域。第二光导向面223也设置在入光面221的上侧面，并设置在第一光导向面222以及传导部23之间，第二光导向面223的表面设置有用于将光源亮区的入射光定向传导至光源暗区的第二光传导微结构2231。
当然这里第一光导向面222以及第二光导向面223也可设置在入光面221的下侧面，或同时设置在入光面221的上侧面以及下侧面。
本优选实施例的背光模块20的导光板的第一光导向面222的散射面2221的表面为抛光面，这样更加利于光源亮区对应的入射光的散射；第一光导向面222的传导面2222的表面设置有第一光传导微结构2223，第一光传导微结构2223的设置更加有利于光源暗区的入射光沿第一光传导微结构2223的延伸方向进行传导。在本优选实施例中，第一光导向面222垂直于入光面，且第一光导向面222表面的第一光传导微结构2223垂直于入光面。为了保证第一光传导微结构2223的导向性，第一光传导微结构2223的微结构孔径小于50微米。
本优选实施例的背光模块20的导光板的第二光导向面223的第二光传导微结构2231可使入射光沿第二光传导微结构2231的延伸方向进行传导，从而实现将光源亮区的入射光定向传导至光源暗区。在本优选实施例中，第二光导向面223与入光面221形成一锐角，以便于进行聚光操作，同时为了保证第二光传导微结构2231的导向性，第二光传导微结构2231的微结构孔径小于50微米。具体的结构如图3所示，图3上未显示第一光传导微结构2223以及第二光传导微结构2231。
本优选实施例的背光模块20使用时，LED光源21的出射光由于LED光源21的分布问题形成明暗交错，其中LED光源21区域对应的导光板区域设定为光源亮区，相邻LED光源21之间的区域对应的导光板区域设定为光源暗区。
明暗交错的入射光通过入光面221射入导光板之后，导光板的楔形入光部22的第一光导向面222对该入射光进行均匀化处理，其中第一光导向面222的散射面2221设置在导光板的光源亮区，其可对光源亮区的入射光进行散射操作，从而减少光源亮区的入射光，增加光源暗区的入射光；第一光导向面222的传导面2222设置在导光板的光源暗区，传导面2222上的第一光传导微结构2223可以保证光源暗区的入射光不会发生散射，从而进一步避免了光源暗区的入射光的减少。因此通过第一光导向面之后，导光板的入射光的亮度均匀性提高了。
随后导光板的楔形入光部22的第二光导向面223对入射光进行进一步的均匀化处理，第二光导向面223上的第二光传导微结构2231可以有效的将光源亮区的入射光定向传导至导光板的光源暗区，从而进一步减少了光源亮区的入射光，增加了光源暗区的入射光，进一步提高了导光板的入射光的亮度均匀性。同时第二光导向面223与入光面221形成一锐角，这样可以对均匀化之后的入射光进行聚光处理，进一步提高了背光源的亮度。
这样通过背光源的导光板的楔形入光部22的第一光导向面222和第二光导向面223的设置，很好的对入射光进行了均匀化处理，避免了亮斑现象的产生。
第一光导向面222的第一光传导微结构2223和第二光导向面223的第二光传导微结构2231的截面可为三角形、圆弧形或其他限制光散射的形状。这样导光板的入光面可以采用提高耦光效率的抛光面，而不用设置V型结构来避免亮斑现象。
本发明的导光板以及背光模块通过第一光导向面和第二光导向面对入射光进行均匀化处理，可在保持背光源的亮度的基础上，消除亮斑现象，且加工流程简单；解决了现有的导光板以及背光模块具有亮斑现象或背光源亮度较低的技术问题。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (19)

  1. 一种导光板，其包括：
    楔形入光部，用于对入射光进行均匀化处理；以及
    传导部，用于将均匀化处理后的所述入射光传输至相应的液晶显示面板；
    其中所述楔形入光部包括：
    入光面，用于接收所述入射光；以及
    第一光导向面，设置在所述入光面的上侧面，其包括用于散射所述入射光的散射面以及用于定向传导所述入射光的传导面，所述散射面设置在所述导光板的光源亮区，所述传导面设置在所述导光板的光源暗区，
    其中所述光源亮区为LED光源区域对应的所述导光板的区域，所述光源暗区为相邻的两个所述LED光源之间区域对应的所述导光板的区域；
    其中所述入光面为抛光面，所述散射面的表面为抛光面，所述传导面的表面设置有第一光传导微结构。
  2. 一种导光板，其包括：
    楔形入光部，用于对入射光进行均匀化处理；以及
    传导部，用于将均匀化处理后的所述入射光传输至相应的液晶显示面板；
    其中所述楔形入光部包括：
    入光面，用于接收所述入射光；以及
    第一光导向面，设置在所述入光面的上侧面，其包括用于散射所述入射光的散射面以及用于定向传导所述入射光的传导面，所述散射面设置在所述导光板的光源亮区，所述传导面设置在所述导光板的光源暗区，
    其中所述光源亮区为LED光源区域对应的所述导光板的区域，所述光源暗区为相邻的两个所述LED光源之间区域对应的所述导光板的区域。
  3. 根据权利要求2所述的导光板，其中所述散射面的表面为抛光面，所述传导面的表面设置有第一光传导微结构。
  4. 根据权利要求3所述的导光板，其中所述第一光导向面垂直于所述入光面。
  5. 根据权利要求4所述的导光板，其中所述第一光传导微结构垂直于所述入光面。
  6. 根据权利要求3所述的导光板，其中所述第一光传导微结构的微结构孔径小于50微米。
  7. 根据权利要求2所述的导光板，其中所述楔形入光部还包括：
    第二光导向面，设置在所述入光面的上侧面，并设置在所述第一光导向面以及所述传导部之间，所述第二光导向面的表面设置有用于将所述光源亮区的所述入射光定向传导至所述光源暗区的第二光传导微结构。
  8. 根据权利要求7所述的导光板，其中所述第二光导向面与所述入光面形成一锐角。
  9. 根据权利要求7所述的导光板，其中所述第二光传导微结构的微结构孔径小于50微米。
  10. 根据权利要求2所述的导光板，其中所述入光面为抛光面。
  11. 一种背光模块，其包括LED光源以及导光板，其中所述导光板包括：
    楔形入光部，用于对入射光进行均匀化处理；以及
    传导部，用于将均匀化处理后的所述入射光传输至相应的液晶显示面板；
    其中所述楔形入光部包括：
    入光面，用于接收所述入射光；以及
    第一光导向面，设置在所述入光面的上侧面，其包括用于散射所述入射光的散射面以及用于定向传导所述入射光的传导面，所述散射面设置在所述导光板的光源亮区，所述传导面设置在所述导光板的光源暗区，
    其中所述光源亮区为LED光源区域对应的所述导光板的区域，所述光源暗区为相邻的两个所述LED光源之间区域对应的所述导光板的区域。
  12. 根据权利要求11所述的背光模块，其中所述散射面的表面为抛光面，所述传导面的表面设置有第一光传导微结构。
  13. 根据权利要求12所述的背光模块，其中所述第一光导向面垂直于所述入光面。
  14. 根据权利要求13所述的背光模块，其中所述第一光传导微结构垂直于所述入光面。
  15. 根据权利要求12所述的背光模块，其中所述第一光传导微结构的微结构孔径小于50微米。
  16. 根据权利要求11所述的背光模块，其中所述楔形入光部还包括：
    第二光导向面，设置在所述入光面的上侧面，并设置在所述第一光导向面以及所述传导部之间，所述第二光导向面的表面设置有用于将所述光源亮区的所述入射光定向传导至所述光源暗区的第二光传导微结构。
  17. 根据权利要求16所述的导光板，其中所述第二光导向面与所述入光面形成一锐角。
  18. 根据权利要求16所述的导光板，其中所述第二光传导微结构的微结构孔径小于50微米。
  19. 根据权利要求11所述的导光板，其中所述第二光传导微结构的微结构孔径小于50微米。
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