WO2017177504A1 - 双面显示装置及其导光板与背光源 - Google Patents

双面显示装置及其导光板与背光源 Download PDF

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Publication number
WO2017177504A1
WO2017177504A1 PCT/CN2016/082310 CN2016082310W WO2017177504A1 WO 2017177504 A1 WO2017177504 A1 WO 2017177504A1 CN 2016082310 W CN2016082310 W CN 2016082310W WO 2017177504 A1 WO2017177504 A1 WO 2017177504A1
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Prior art keywords
light guide
reflecting surface
light
sub
guide plate
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PCT/CN2016/082310
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English (en)
French (fr)
Inventor
黄笑宇
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深圳市华星光电技术有限公司
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Priority to US15/115,626 priority Critical patent/US20180088273A1/en
Publication of WO2017177504A1 publication Critical patent/WO2017177504A1/zh

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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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02B6/0063—Means for improving the coupling-out of light from the light guide for extracting light out both the major surfaces 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • 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
    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • 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
    • G02F1/133342—Constructional arrangements; Manufacturing methods for double-sided displays
    • 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 relates to the field of display technologies, and in particular, to a double-sided display device, a light guide plate thereof and a backlight.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • IT Information Technology
  • video products Since the liquid crystal itself does not emit light, it is necessary to configure a BL (back light) for display.
  • the display structure commonly used in the double-sided display technology in the commercial display is as shown in FIG. 1.
  • two display panels are required to share one backlight, and there is no conventional backlight structure such as a reflective sheet, so the brightness of the backlight is And light energy utilization has higher requirements.
  • the light emitted by the LEDs (Light Emitting Diodes 2) at both ends is transmitted through the light guide plate 3, and then mixed by the optical film on both sides of the light guide plate 3 to form a uniform surface light source for display on both sides.
  • Panel 1 is displayed.
  • the horizontal component of the light emitted by the LED 2 in the conventional double-sided display architecture is directly transmitted to the opposite side through the light guide plate, and cannot be transmitted to the display module for display use, resulting in waste of light energy, indirectly causing backlight power.
  • the increase is not conducive to energy saving and improve the light utilization of the backlight.
  • the present invention provides a double-sided display device with high light utilization efficiency and energy saving, a light guide plate and a backlight thereof.
  • a light guide plate for a double-sided display device includes an upper light exiting surface in a thickness direction, a lower light emitting surface, a left entrance light end surface in a length direction, and a right entrance light end surface, and the light guide plate further includes a reflection disposed at a middle portion
  • the reflecting portion includes a first reflecting surface facing the upper light emitting surface and the left light incident end surface, Simultaneously facing the second reflecting surface of the upper light emitting surface and the right light incident end surface, and simultaneously facing the lower reflecting surface and the third reflecting surface of the left incident light end surface, simultaneously facing the lower emitting surface and the a fourth reflecting surface of the right entrance end surface, the first reflecting surface, the second reflecting surface, the third reflecting surface and the fourth reflecting surface are connected end to end to form a closed structure, and the reflecting portion The thickness direction and the width direction of the light guide plate are completely covered.
  • first reflective surface, the second reflective surface, the third reflective surface, and the fourth reflective surface are all curved surfaces.
  • first reflective surface, the second reflective surface, the third reflective surface, and the fourth reflective surface are both recessed toward a central portion of the reflective portion.
  • first reflective surface and the second reflective surface, the third reflective surface and the fourth reflective surface are symmetrically disposed.
  • the first reflective surface is symmetrically disposed with the fourth reflective surface.
  • the light guide plate is formed by splicing two sub-light guide plates in the longitudinal direction, and the reflection portion is a reflective layer applied to the end faces of the two sub-light guide plates.
  • the light guide plate is formed by splicing the two sub-light guide plates in the longitudinal direction and the reflection portion of the polyhedral structure between the two sub-light guide plates.
  • the light guide plate is formed by splicing two sub-light guide plates in the longitudinal direction, and the end faces of each of the sub-light guide plates are recessed, and the reflection portion includes recessed end faces respectively embedded in one of the sub-light guide plates.
  • Two sub-reflectors, each of the sub-light guide plates and the corresponding sub-reflectors form a combination of end faces being planar.
  • Another object of the present invention is to provide a backlight for a double-sided display device, including the above-described light guide plate and the side-entry light source module at both ends thereof.
  • It is still another object of the present invention to provide a double-sided display device comprising the above-described light guide plate and the side-entry light source module at both ends thereof and the display panels on both sides.
  • the horizontal component of the light emitted by the light source module at both ends of the light guide plate in the display device is changed by the reflective surface, the light is emitted to the display panel reflected on both sides, so that the light utilization rate of the light source module can be utilized. Increase by at least 5% to 10%, so that it is no longer necessary to increase the brightness of the light source, economical and energy-saving, and the competitiveness of the product can be greatly improved.
  • FIG. 1 is a schematic structural view of a double-sided display device of the prior art.
  • FIG. 2 is a schematic perspective structural view of a backlight according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic structural view of another direction of a backlight according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural view of a double-sided display device according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic structural view of a backlight according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a backlight according to Embodiment 3 of the present invention.
  • the terms “upper”, “lower”, “left”, and “right”, which are used herein to refer to the positional relationship, are referred to with reference to the arrangement of FIG. Note that here, the “longitudinal direction” refers to the longer direction of the object, the “width direction” refers to the narrower direction of the object, and the thickness direction is the height direction of the object.
  • the backlight of the embodiment includes a light guide plate 10 and a side-in-the-light source module 20 at both ends thereof.
  • the light source module 20 of the embodiment is described by taking an LED light source as an example.
  • the light guide plate 10 includes an upper light exit surface 10a, a lower light exit surface 10b, a left entrance light end surface 10c and a right entrance light end surface 10d in the thickness direction, and the light guide plate further includes a reflection portion (not shown) disposed in the middle portion.
  • the reflecting portion includes a first reflecting surface S1 that faces both the upper light emitting surface 10a and the left light incident end surface 10c, and a second reflecting surface S2 that faces the upper light emitting surface 10a and the right light incident end surface 10d, and simultaneously faces the lower light emitting surface 10b and the left side. a third reflecting surface S3 of the light end surface 10d, a fourth reflecting surface S4 facing the lower light emitting surface 10b and the right light incident end surface 10c, a first reflecting surface S1, a second reflecting surface S2, a third reflecting surface S3, and a fourth reflection
  • the surface S4 is connected end to end to form a closed structure, and the reflecting portion completely covers the thickness direction and the width direction of the light guide plate.
  • the reflection portion in the middle portion has the same thickness and width as the light guide plate 10, so that the light emitted from the light source module 20 at both ends cannot pass, and the light emitted from the light source module 20 at both ends passes through.
  • the reflection portion After the reflection portion is reflected, it is emitted toward the upper light-emitting surface 10a and the lower light-emitting surface 10b on both sides. That is, the light irradiated to the upper half of the reflecting portion by the light source module 20 on the left side is reflected by the first reflecting surface S1 and then emitted from the upper light emitting surface 10a, and the light source module 20 on the left side is irradiated to the lower half of the reflecting portion.
  • Reflective surface S4 After the shot, the light source module 20 is emitted from the upper light-emitting surface 10b, and the light from the light source module 20 on the right side is reflected by the second reflecting surface S2 and then emitted from the upper light-emitting surface 10b, and the light source module 20 on the right side is irradiated to the reflection.
  • the light in the lower half is reflected by the third reflecting surface S3 and then emitted from the lower emitting surface 10b.
  • the first reflecting surface S1, the second reflecting surface S2, the third reflecting surface S3, and the fourth reflecting surface S4 are all curved surfaces, and the first reflecting surface S1, the second reflecting surface S2, and the third reflecting surface S3 and The four reflecting surfaces S4 are each recessed toward the middle of the reflecting portion.
  • the cross-sections of the first reflecting surface S1, the second reflecting surface S2, the third reflecting surface S3, and the fourth reflecting surface S4 are both 1/4 arcs, the area of the light reflected by the reflecting portion is large, and the display panel 30 receives The light uniformity is high. It can be understood that, in other embodiments, the first reflective surface S1, the second reflective surface S2, the third reflective surface S3, and the fourth reflective surface S4 may all be planar, and surround the reflection portion of the diamond-shaped cross section. The uniformity is slightly weaker than the circular arc reflecting surface.
  • the first reflective surface S1 and the second reflective surface S2, the third reflective surface S3 and the fourth reflective surface S4 are symmetrically disposed, respectively, and the first reflective surface S1 and the fourth reflective surface S4 are symmetric. Settings. In this way, it can be ensured that the pictures displayed on the display panels 30 on the upper and lower sides have the same image quality.
  • the reflecting portion of the embodiment is a single polyhedral structure, the outer surface of which is a reflective material
  • the light guide plate 10 has a polyhedral structure between two sub-light guide plates in the longitudinal direction and two sub-light guide plates.
  • the reflecting portions are spliced together, and the end faces of each of the sub-light guide plates are recessed, and are formed by connecting two convex arc faces which are respectively expanded toward the upper and lower sides, so as to conform to the shape of the reflecting portion of the polyhedron to ensure good wedge bonding, thereby ensuring a good wedge. Reflective effect.
  • the horizontal component of the light emitted by the light source module at both ends of the light guide plate in the display device is changed by the reflective surface, the light is emitted to the display panel reflected on both sides, so that the light utilization rate of the light source module can be utilized. Increase by at least 5% to 10%, so that it is no longer necessary to increase the brightness of the light source, economical and energy-saving, and the competitiveness of the product can be greatly improved.
  • the light guide plate 10 of the present embodiment is formed by splicing two sub-light guide plates in the longitudinal direction, and the reflection portion is a reflective layer applied to the end faces of the two sub-light guide plates.
  • the two sub-light guides are hollow or filled with other materials. This structure saves material and improves the competitiveness of the product.
  • the light guide plate of the present embodiment is formed by splicing two sub-light guide plates in the longitudinal direction, and the end faces of each of the sub-light guide plates are recessed, and the reflection portion includes two sub-reflections.
  • the body is respectively embedded in the concave end faces of one of the sub-light guide plates, and each of the sub-reflectors includes a reflecting surface facing the light incident end face and a plane for bonding with the other reflecting body, each of the sub-light guide plates and the corresponding sub-reflector
  • the combination of the end faces is a flat surface so as to be assembled with the other sub-light guide plate and the corresponding sub-reflector assembly into a completed light guide plate.

Abstract

一种双面显示装置及其导光板(10)与背光源，导光板(10)具有中部的反射部，反射部包括同时朝向上出光面(10a)和左入光端面(10c)的第一反射面、同时朝向上出光面(10a)和右入光端面(10d)的第二反射面(S2)、同时朝向下出光面(10b)和左入光端面(10c)的第三反射面(S3)、同时朝向下出光面(10b)和右入光端面(10d)的第四反射面(S4)，第一反射面(S1)、第二反射面(S2)、第三反射面(S3)和第四反射面(S4)首尾相连围成封闭的结构，且反射部完全覆盖与导光板(10)的厚度方向和宽度方向。由于显示装置中通过导光板(10)两端的光源模组(20)发出的光中的水平分量会被反射面改变传输方向，从而被引导至反射至两侧的显示面板(30)，使得光源模组(20)发出的光线的利用率可以提升至少5％～10％，从而不必再额外提高光源亮度，经济节能，产品竞争力得以大幅提升。

Description

双面显示装置及其导光板与背光源 技术领域
本发明涉及显示技术领域，尤其涉及一种双面显示装置及其导光板与背光源。
背景技术
TFT-LCD(Thin Film Transistor Liquid Crystal Display，薄膜晶体管液晶显示器)是当前平板显示的主要技术之一，已经成为了现代IT(Information Technology，信息技术)、视讯产品中重要的显示平台。由于液晶本身并不发光，为进行显示，需要配置BL(back light，背光源)。
目前商用显示中的双面显示技术常用的显示结构如图1所示，为实现双面显示需要两个显示面板1面共用一个背光源，没有反射片等传统背光结构，所以对背光源的亮度和光能利用率有更高的要求。其中，两端的LED(Light Emitting Diode，发光二极管)2发出的光经过导光板3传导，再经过导光板3两侧的光学膜片混光处理，最终形成均匀的面光源，供两侧的显示面板1显示用。
然而，传统双面显示架构中的LED 2发出的光中的水平分量，会经过导光板直接传导至对侧，没办法传输至显示模块供显示使用，造成光能的浪费，间接导致背光源功率的增大，不利于节能和提高背光源的光线利用率。
发明内容
鉴于现有技术存在的不足，本发明提供了一种光线利用率高、节能的双面显示装置及其导光板与背光源。
为了实现上述的目的，本发明采用了如下的技术方案：
一种用于双面显示装置的导光板，包括厚度方向上的上出光面、下出光面和长度方向上的左入光端面、右入光端面，所述导光板还包括设于中部的反射部，所述反射部包括同时朝向所述上出光面和所述左入光端面的第一反射面、 同时朝向所述上出光面和所述右入光端面的第二反射面、同时朝向所述下出光面和所述左入光端面的第三反射面、同时朝向所述下出光面和所述右入光端面的第四反射面，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面首尾相连围成封闭的结构，且所述反射部完全覆盖与所述导光板的厚度方向和宽度方向。
进一步地，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均为弧面。
进一步地，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均朝所述反射部的中部凹陷。
进一步地，所述第一反射面与所述第二反射面、所述第三反射面与所述第四反射面分别对称设置。
进一步地，所述第一反射面与所述第四反射面对称设置。
进一步地，所述导光板由长度方向上的两块子导光板拼接而成，所述反射部为涂覆于两个所述子导光板端面的反射层。
或者，所述导光板由长度方向上的两块子导光板及两个所述子导光板之间的多面体结构的所述反射部拼接而成。
或者，所述导光板由长度方向上的两块子导光板拼接而成，每个所述子导光板的端面凹陷设置，所述反射部包括分别嵌入一个所述子导光板的凹陷的端面的两个子反射体，每个所述子导光板与相应的所述子反射体组成端面为平面的组合体。
本发明的另一目的在于提供一种用于双面显示装置的背光源，包括上述的导光板及其两端的侧入式光源模组。
本发明的又一目的在于提供一种双面显示装置，包括上述的导光板及其两端的侧入式光源模组和两侧的显示面板。
由于显示装置中通过导光板两端的光源模组发出的光中的水平分量会被反射面改变传输方向，从而被引导至反射至两侧的显示面板，使得光源模组发出的光线的利用率可以提升至少5％～10％，从而不必再额外提高光源亮度，经济节能，产品竞争力得以大幅提升。
附图说明
图1为现有技术的双面显示装置的结构示意图。
图2为本发明实施例1的背光源的透视结构示意图。
图3为本发明实施例1的背光源的另一方向的结构示意图。
图4为本发明实施例1的双面显示装置的结构示意图。
图5为本发明实施例2的背光源的结构示意图。
图6为本发明实施例3的背光源的结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
需要说明的是，为了更好地对实施例进行描述，本文所使用的表示位置关系的术语“上”、“下”、“左”、“右”是以图4的摆放方式为参照进行说明，而这里，“长度方向”是指沿物体较长的方向，“宽度方向”则是指沿物体较窄的方向，厚度方向则是沿物体的高度方向。
实施例1
参阅图2和图3，本实施例的背光源包括导光板10及其两端的侧入式光源模组20，本实施例的光源模组20以LED光源为例进行说明。导光板10包括厚度方向上的上出光面10a、下出光面10b和长度方向上的左入光端面10c、右入光端面10d，导光板还包括设于中部的反射部(图未标)，反射部包括同时朝向上出光面10a和左入光端面10c的第一反射面S1、同时朝向上出光面10a和右入光端面10d的第二反射面S2、同时朝向下出光面10b和左入光端面10d的第三反射面S3、同时朝向下出光面10b和右入光端面10c的第四反射面S4，第一反射面S1、第二反射面S2、第三反射面S3和第四反射面S4首尾相连围成封闭的结构，且反射部完全覆盖与导光板的厚度方向和宽度方向。
结合图4所示，双面显示装置中，中部的反射部具有与导光板10相同的厚度和宽度，使得两端的光源模组20发出的光不能通过，两端的光源模组20发出的光线经反射部反射后分别朝向两侧的上出光面10a、下出光面10b出射。即左侧的光源模组20照射至反射部上半部的光经第一反射面S1反射后自上出光面10a射出，左侧的光源模组20照射至反射部下半部的光经第四反射面S4反 射后自上出光面10b射出，右侧的光源模组20照射至反射部上半部的光经第二反射面S2反射后自上出光面10b射出，右侧的光源模组20照射至反射部下半部的光经第三反射面S3反射后自下出光面10b射出。其中，第一反射面S1、第二反射面S2、第三反射面S3和第四反射面S4均为弧面，且第一反射面S1、第二反射面S2、第三反射面S3和第四反射面S4均朝反射部的中部凹陷。当第一反射面S1、第二反射面S2、第三反射面S3和第四反射面S4的截面均为1/4圆弧时，经反射部反射的光线覆盖面积较大，显示面板30接收到的光线均匀性较高。可以理解的是，在其他实施方式中，第一反射面S1、第二反射面S2、第三反射面S3和第四反射面S4可以均为平面，围成菱形截面的反射部，单其反射均匀性比圆弧形反射面稍弱。
作为本实施例的一种实施方式，第一反射面S1与第二反射面S2、第三反射面S3与第四反射面S4分别对称设置，且第一反射面S1与第四反射面S4对称设置。此种方式可以保证上下两侧的显示面板30显示的画面具有相同的画质。
为方便制造和组装，本实施例的反射部为单独的多面体结构，其外表面为反光材料，导光板10由长度方向上的两块子导光板及两个子导光板之间的呈多面体结构的该反射部拼接而成，每块子导光板端面凹陷，由分别朝上下两侧扩张的两个凸起的弧面连接而成，以与多面体的反射部形状一致而保证良好地楔合，保证反光效果。
由于显示装置中通过导光板两端的光源模组发出的光中的水平分量会被反射面改变传输方向，从而被引导至反射至两侧的显示面板，使得光源模组发出的光线的利用率可以提升至少5％～10％，从而不必再额外提高光源亮度，经济节能，产品竞争力得以大幅提升。
实施例2
如图5所示，与实施例1不同的是，本实施例的导光板10由长度方向上的两块子导光板拼接而成，反射部为涂覆于两个子导光板端面的反射层，两块子导光板之间中空或者使用其他材料填充而成，此种结构最大限度地节省了材料，提高了产品的竞争力。
实施例3
如图6所示，与实施例1不同的是，本实施例的导光板由长度方向上的两块子导光板拼接而成，每个子导光板的端面凹陷设置，反射部包括两个子反射 体，分别嵌入一个子导光板的凹陷的端面，每个子反射体均包括朝向入光端面的反射面和用于与另一个反射体相互贴合的平面，每个子导光板与相应的子反射体组成端面为平面的组合体，以便与另一个子导光板与相应的子反射体组成的组合体组装成完成的导光板。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (19)

  1. 一种用于双面显示装置的导光板，包括厚度方向上的上出光面、下出光面和长度方向上的左入光端面、右入光端面，其中，所述导光板还包括设于中部的反射部，所述反射部包括同时朝向所述上出光面和所述左入光端面的第一反射面、同时朝向所述上出光面和所述右入光端面的第二反射面、同时朝向所述下出光面和所述左入光端面的第三反射面、同时朝向所述下出光面和所述右入光端面的第四反射面，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面首尾相连围成封闭的结构，且所述反射部完全覆盖与所述导光板的厚度方向和宽度方向。
  2. 根据权利要求1所述的导光板，其中，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均为弧面。
  3. 根据权利要求2所述的导光板，其中，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均朝所述反射部的中部凹陷。
  4. 根据权利要求3所述的导光板，其中，所述第一反射面与所述第二反射面、所述第三反射面与所述第四反射面分别对称设置。
  5. 根据权利要求4所述的导光板，其中，所述第一反射面与所述第四反射面对称设置。
  6. 根据权利要求1所述的导光板，其中，所述导光板由长度方向上的两块子导光板拼接而成，所述反射部为涂覆于两个所述子导光板端面的反射层。
  7. 根据权利要求1所述的导光板，其中，所述导光板由长度方向上的两块子导光板及两个所述子导光板之间的多面体结构的所述反射部拼接而成。
  8. 根据权利要求1所述的导光板，其中，所述导光板由长度方向上的两块子导光板拼接而成，每个所述子导光板的端面凹陷设置，所述反射部包括分别嵌入一个所述子导光板的凹陷的端面的两个子反射体，每个所述子导光板与相应的所述子反射体组成端面为平面的组合体。
  9. 一种用于双面显示装置的背光源，其中，包括权利要求1所述的导光板及其两端的侧入式光源模组。
  10. 根据权利要求9所述的背光源，其中，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均为弧面。
  11. 一种双面显示装置，其中，包括导光板及其两端的侧入式光源模组和两侧的显示面板，所述导光板包括厚度方向上的上出光面、下出光面和长度方向上的左入光端面、右入光端面，其中，所述导光板还包括设于中部的反射部，所述反射部包括同时朝向所述上出光面和所述左入光端面的第一反射面、同时朝向所述上出光面和所述右入光端面的第二反射面、同时朝向所述下出光面和所述左入光端面的第三反射面、同时朝向所述下出光面和所述右入光端面的第四反射面，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面首尾相连围成封闭的结构，且所述反射部完全覆盖与所述导光板的厚度方向和宽度方向。
  12. 根据权利要求11所述的双面显示装置，其中，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均为弧面。
  13. 根据权利要求12所述的双面显示装置，其中，所述第一反射面、所述第二反射面、所述第三反射面和所述第四反射面均朝所述反射部的中部凹陷。
  14. 根据权利要求13所述的双面显示装置，其中，所述第一反射面与所述第二反射面、所述第三反射面与所述第四反射面分别对称设置。
  15. 根据权利要求14所述的双面显示装置，其中，所述第一反射面与所述第四反射面对称设置。
  16. 根据权利要求11所述的双面显示装置，其中，所述导光板由长度方向上的两块子导光板拼接而成，所述反射部为涂覆于两个所述子导光板端面的反射层。
  17. 根据权利要求11所述的双面显示装置，其中，所述导光板由长度方向上的两块子导光板及两个所述子导光板之间的多面体结构的所述反射部拼接而成。
  18. 根据权利要求11所述的双面显示装置，其中，所述导光板由长度方向上的两块子导光板拼接而成，每个所述子导光板的端面凹陷设置，所述反射部包括分别嵌入一个所述子导光板的凹陷的端面的两个子反射体，每个所述子导光板与相应的所述子反射体组成端面为平面的组合体。
  19. 根据权利要求12所述的双面显示装置，其中，所述导光板由长度方向上的两块子导光板拼接而成，每个所述子导光板的端面凹陷设置，所述反射部包括分别嵌入一个所述子导光板的凹陷的端面的两个子反射体，每个所述子导 光板与相应的所述子反射体组成端面为平面的组合体。
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