WO2016201887A1 - 导光结构、背光模组和显示装置 - Google Patents

导光结构、背光模组和显示装置 Download PDF

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Publication number
WO2016201887A1
WO2016201887A1 PCT/CN2015/095279 CN2015095279W WO2016201887A1 WO 2016201887 A1 WO2016201887 A1 WO 2016201887A1 CN 2015095279 W CN2015095279 W CN 2015095279W WO 2016201887 A1 WO2016201887 A1 WO 2016201887A1
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WO
WIPO (PCT)
Prior art keywords
light
reflective
light guide
film
guide plate
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PCT/CN2015/095279
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English (en)
French (fr)
Inventor
祝明
铃木照晃
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京东方科技集团股份有限公司
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Priority to US15/101,250 priority Critical patent/US9897741B2/en
Publication of WO2016201887A1 publication Critical patent/WO2016201887A1/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
    • G02B6/0001—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
    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • 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
    • G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n

Definitions

  • Embodiments of the present invention relate to a light guiding structure, a backlight module, and a display device.
  • Liquid crystal display has the advantages of low radiation, small size and low energy consumption. It has gradually replaced the traditional cathode ray tube display (CRT) and is widely used in notebook computers and personal digital devices. Products such as Personal Digital Assistant (PDA), flat-panel TVs, and mobile phones.
  • PDA Personal Digital Assistant
  • the liquid crystal display comprises a display panel and a backlight module.
  • the backlight module is a component for providing a light source to the liquid crystal display product, and is generally disposed under the display panel to provide uniform divergence and a certain brightness of light to the display panel according to the pixels on the display panel.
  • the different voltages of the electrodes form a color picture of different brightness, different colors and different gradations.
  • the backlight module with the light source disposed on the side is a side-in backlight module.
  • the light (line light source) emitted by the light source enters the light guide plate from the side, and the light guide plate converts the line light source into a uniformly distributed surface light source, and then exits, and then passes through the lower polarizer to become linearly polarized light and reaches the display. panel.
  • the lower polarizer can only pass the linearly polarized light, that is, a part of the light emitted by the light guide plate cannot pass through the lower polarizer, and this part cannot pass through the lower polarizer. The light from the polarizer will be wasted.
  • Embodiments of the present invention provide a light guiding structure, a backlight module, and a display device to reduce loss of light during propagation and improve light utilization efficiency.
  • At least one embodiment of the present invention provides a light guiding structure, including:
  • the light guide plate includes opposite light-emitting surfaces and a reflective surface, and a side surface connecting the light-emitting surface and the reflective surface, wherein the material of the light guide plate is an isotropic material;
  • the reflective brightness enhancing film is disposed on a side of the light emitting surface of the light guiding plate;
  • the ⁇ /4 wave plate is disposed on a light emitting surface of the light guide plate and the reflection type is increased Between the bright films, and the angle between the slow axis of the ⁇ /4 wave plate and the transmission axis of the reflective brightness enhancing film is 45 degrees;
  • a reflective film disposed on a side of the reflective surface of the light guide plate.
  • the light guiding structure further includes a lower polarizer disposed above the reflective brightness enhancing film, a transmission axis of the lower polarizer and a transmission of the reflective brightness enhancing film The axes are parallel.
  • the lower polarizer is an absorptive polarizer.
  • the light guide plate is a glass light guide plate.
  • the light guide plate is a rigid polymethyl methacrylate light guide plate
  • the reflective film is an enhanced specular reflective film.
  • the reflective film has a thickness of 2-5 microns.
  • Another embodiment of the present invention further provides a backlight module, comprising the light guiding structure according to any of the above, further comprising a light source, wherein the light source is disposed at a side of the light guide plate.
  • a further embodiment of the present invention further provides a display device, including a display panel, further comprising a backlight module as described above, wherein the backlight module is disposed on a non-display side of the display panel.
  • the display device further includes an upper polarizer disposed on a display side of the display panel, and a transmission axis of the upper polarizer and the lower surface of the light guiding structure The transmission axis of the polarizer is parallel or perpendicular.
  • FIG. 1 is a schematic structural diagram of a light guiding structure according to an embodiment of the present invention.
  • FIG. 2 is a schematic view showing an angle between a transmission axis of a reflective brightness enhancing film and a slow axis of a ⁇ /4 wave plate according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a light guiding module according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention.
  • the inventors have noticed that the light guiding structure of the known side-lit backlight module wastes a part of the light emitted by the light source, so that the light emitted by the light source will have a large loss during the propagation process, resulting in low light utilization.
  • At least one embodiment of the present invention provides a light guiding structure 10 including a light guiding plate 1 including a light emitting surface 11 and a reflecting surface 12 disposed opposite to each other, and connecting the light emitting surface 11 and the reflecting surface 12 .
  • the side surface 13, the material of the light guide plate 1 is an isotropic material; the reflective brightness enhancement film 2, the reflective brightness enhancement film 2 is disposed on the side of the light exit surface 11 of the light guide plate 1; ⁇ /4 wave plate 3, ⁇ /4 The wave plate is disposed between the light-emitting surface 11 of the light guide plate 1 and the reflective brightness enhancement film 2, and the angle between the slow axis of the ⁇ /4 wave plate 3 and the transmission axis of the reflective brightness enhancement film 2 is 45 degrees;
  • the reflective film 4 and the reflective film 4 are disposed on the side of the reflective surface 12 of the light guide plate 1.
  • the reflective brightness enhancing film 2 and the ⁇ /4 wave plate 3 are used to match, so that the outgoing light that is inconsistent with the transmission axis of the reflective brightness enhancing film 2 (ie, the guiding light).
  • the light emitted from the light plate is reflected by the reflective brightness enhancing film 2, and is converted into left circularly polarized light into the light guiding plate 1 via the ⁇ /4 wave plate 3 and reaches the reflective film 4, and then reflected by the reflective film 4 and converted into a right circular circle.
  • the polarized light is returned to the light guide plate 1, and then converted into linearly polarized light in accordance with the transmission axis of the reflective brightness enhancement film 2 via the ⁇ /4 wave plate 3, and then passed through the reflective brightness enhancement film 2, thereby reducing light during propagation. Loss and increase the utilization of light.
  • the light guiding structure may further include a lower polarizer 5, and the lower polarizer 5 is disposed above the reflective brightness enhancing film 2, and the transmission axis of the lower polarizing film 5 is parallel to the transmission axis of the reflective brightness enhancing film 2.
  • the lower polarizer 5 and the reflective brightness enhancement film 2 have the same transmission axis, and the linearly polarized light transmitted through the reflective brightness enhancement film 2 can also pass through the lower polarizer 5.
  • FIG. 2 is a schematic view showing the angle between the transmission axis 21 of the reflective brightness enhancement film 2 and the slow axis 31 of the ⁇ /4 wave plate 3, for example, the transmission axis 21 and the ⁇ /4 wave plate of the reflective brightness enhancement film 2.
  • the angle of the slow axis 31 of 3 is 45 degrees. Accordingly, the transmission axis of the lower polarizer 5 is parallel to the transmission axis 21 of the brightness enhancement film 2 (not shown).
  • the lower polarizer 5 is an absorbing polarizer.
  • the lower polarizer 5 can be different from its transmission axis The resulting light is absorbed.
  • the light guide plate 1 can be prepared using a variety of isotropic materials, such as glass, or hard polymethyl methacrylate (plexiglass).
  • the light guide plate 1 is a glass light guide plate.
  • the light guide plate 1 is prepared by using a glass having a higher hardness and a lower coefficient of thermal expansion to facilitate the thinning of the light guide plate 1, and the glass is an isotropic material, and the polarization direction does not change when the light propagates therein.
  • the light guide plate 1 is a rigid polymethyl methacrylate light guide plate.
  • the rigid polymethyl methacrylate light guide plate is an isotropic material, and the polarization direction does not change when light propagates therein.
  • the reflective film 4 is an enhanced specular reflection film.
  • the reflective film 4 has a thickness of 2 to 5 ⁇ m.
  • the reflective brightness enhancing film and the ⁇ /4 wave plate are used for matching, so that the emitted light which is inconsistent with the transmission axis of the reflective brightness enhancing film is reflected by the reflective brightness enhancing film.
  • ⁇ /4 wave plate After ⁇ /4 wave plate, it is converted into left-handed circularly polarized light and enters the light guide plate, which is then reflected by the reflective film and converted into right-handed circularly polarized light into the light guide plate, and then converted into a reflective brightness enhancement film by ⁇ /4 wave plate.
  • the linearly polarized light passing through the axis passes through the reflective brightness enhancing film, thereby reducing the loss of light during propagation and improving the utilization of light.
  • an embodiment of the present invention further provides a backlight module 20 , comprising the light guiding structure 10 as described above, further comprising a light source 6 disposed at a side surface 13 of the light guide plate 1 .
  • the light guiding structure of the backlight module is matched by the reflective brightness enhancement film and the ⁇ /4 wave plate, so that the light that is inconsistent with the transmission axis of the reflective brightness enhancement film is reflected.
  • the brightness enhancement film is reflected by the ⁇ /4 wave plate and then converted into left-handed circularly polarized light into the light guide plate, which is then reflected by the reflection film and converted into right-handed circularly polarized light into the light guide plate, and then converted into a light guide by the ⁇ /4 wave plate.
  • the reflective brightness-increasing film transmits linearly polarized light with a uniform transmission axis and then passes through the reflective brightness enhancing film, thereby reducing the loss of light during propagation and improving the utilization of light.
  • an embodiment of the present invention further provides a display device, including a display panel 7 , and a backlight module 20 as described above.
  • the backlight module 20 is disposed on a non-display side of the display panel 7 .
  • the display device further includes an upper polarizer 8 disposed on the display side of the display panel 7, and the transmission axis of the upper polarizer 8 is parallel or perpendicular to the transmission axis of the lower polarizer 5 of the light guiding structure 10. .
  • the light guiding structure of the backlight module is matched by the reflective brightness enhancement film and the ⁇ /4 wave plate, so that the light emitted from the transmission axis of the reflective brightness enhancement film is inconsistent.
  • Reflected by the reflective brightness enhancement film converted into left-handed circularly polarized light into the light guide plate after ⁇ /4 wave plate, then reflected by the reflection film and converted into right-handed circularly polarized light into the light guide plate, and then converted by ⁇ /4 wave plate.
  • the linearly polarized light conforming to the transmission axis of the reflective brightness enhancing film passes through the reflective brightness enhancing film, thereby reducing the loss of light during propagation and improving the utilization of light.

Abstract

一种导光结构(10)、背光模组(20)和显示装置，可减少光在传播过程中的损失、提高光利用率。导光结构(10)包括：导光板(1)，导光板(1)包括相对设置的出光面(11)和反射面(12)，以及连接出光面(11)和反射面(12)的侧面(13)，其中，导光板(1)的材料为各向同性材料；反射式增亮膜(2)，增亮膜(2)设置于导光板(1)的出光面(11)所在侧；λ/4波片(3)，λ/4波片(3)设置于导光板(1)的出光面(11)和增亮膜(2)之间，且λ/4波片(3)的慢轴与增亮膜(2)的透过轴的夹角为45度；以及反射膜(4)，反射膜(4)设置于导光板(1)的反射面(12)所在侧。

Description

导光结构、背光模组和显示装置 技术领域
本发明的实施例涉及一种导光结构、背光模组和显示装置。
背景技术
液晶显示器(Liquid Crystal Display，LCD)具有低辐射、体积小及低耗能等优点，已逐渐取代传统的阴极射线管显示器(Cathode Ray Tube display，CRT)而被广泛地应用在笔记本电脑、个人数字助理(Personal Digital Assistant，PDA)、平面电视和移动电话等产品上。
液晶显示器包括显示面板和背光模组，背光模组是给液晶显示器产品提供光源的组件，通常设置于显示面板的下方，以提供均匀发散和一定亮度的光线至显示面板，根据显示面板上的像素电极的不同电压来形成不同亮度、不同色彩和不同灰度的彩色画面。
光源设置于侧面的背光模组为侧入式背光模组。在侧入式背光模组中，光源发出的光线(线光源)由侧面进入导光板，导光板将线光源转化成均匀分布的面光源后出射，通过下偏光片后变为线偏振光到达显示面板。但是，已知的侧入式背光模组的导光结构中，下偏光片仅能使线偏振光通过，即由导光板出射的光的一部分无法通过该下偏光片，而这部分无法通过下偏光片的光会被浪费掉。
发明内容
本发明的实施例提供一种导光结构、背光模组和显示装置，以减少光在传播过程中的损失，提高光利用率。
本发明的至少一个实施例提供一种导光结构，包括：
导光板，所述导光板包括相对设置的出光面和反射面，以及连接所述出光面和反射面的侧面，其中，所述导光板的材料为各向同性材料；
反射式增亮膜，所述反射式增亮膜设置于所述导光板的出光面所在侧；
λ/4波片，所述λ/4波片设置于所述导光板的出光面和所述反射式增 亮膜之间，且所述λ/4波片的慢轴与所述反射式增亮膜的透过轴的夹角为45度；以及
反射膜，所述反射膜设置于所述导光板的反射面所在侧。
在一些示例中，导光结构还包括下偏光片，所述下偏光片设置于所述反射式增亮膜上方，所述下偏光片的透过轴与所述反射式增亮膜的透过轴平行。
在一些示例中，所述下偏光片为吸收式偏光片。
在一些示例中，所述导光板为玻璃导光板。
在一些示例中，所述导光板为硬质的聚甲基丙烯酸甲脂导光板
在一些示例中，所述反射膜为增强镜面反射膜。
在一些示例中，所述反射膜的厚度为2-5微米。
本发明的另一实施例还提供一种背光模组，包括如上任一所述的导光结构，还包括光源，所述光源设置于所述导光板的侧面处。
本发明的又一实施例还提供一种显示装置，包括显示面板，还包括如上任一所述的背光模组，所述背光模组设置于所述显示面板的非显示侧。
在一些示例中，所述显示装置还包括上偏光片，所述上偏光片设置于所述显示面板的显示侧，且所述上偏光片的透过轴与所述导光结构的所述下偏光片的透过轴平行或垂直。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显然，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1为本发明实施例提供的导光结构的结构示意图；
图2为本发明实施例中反射式增亮膜的透过轴和λ/4波片的慢轴的夹角的示意图；
图3为本发明实施例提供的导光模组的结构示意图；
图4为本发明实施例提供的显示装置的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发 明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
发明人注意到，已知的侧入式背光模组的导光结构会浪费掉光源发出的光的一部分，使得光源发出的光在传播过程时会有较大的损失，导致光利用率低。
参见图1，本发明的至少一个实施例提供了一种导光结构10，包括：导光板1，导光板1包括相对设置的出光面11和反射面12，以及连接出光面11和反射面12的侧面13，导光板1的材料为各向同性材料；反射式增亮膜2，反射式增亮膜2设置于导光板1的出光面11所在侧；λ/4波片3，λ/4波片设置于导光板1的出光面11和反射式增亮膜2之间，且λ/4波片3的慢轴与反射式增亮膜2的透过轴的夹角为45度；以及反射膜4，反射膜4设置于导光板1的反射面12所在侧。
在本发明实施例提供的导光结构中，采用反射式增亮膜2和λ/4波片3进行配合，使得与反射式增亮膜2的透过轴不一致的出射光(即，从导光板出射的光)被反射式增亮膜2反射，经λ/4波片3后转换为左旋圆偏振光进入导光板1并到达反射膜4，再经反射膜4反射并转换为右旋圆偏振光返回导光板1，再经λ/4波片3转换为与反射式增亮膜2的透过轴一致的线偏振光后通过反射式增亮膜2，从而减少光在传播过程中的损失，提高光的利用率。
例如，导光结构还可以包括下偏光片5，下偏光片5设置于反射式增亮膜2上方，下偏光片5的透过轴与反射式增亮膜2的透过轴平行。本实施例中，下偏光片5和反射式增亮膜2透过轴一致，透过反射式增亮膜2的线偏振光同样可以透过下偏光片5。
图2为反射式增亮膜2的透过轴21和λ/4波片3的慢轴31的夹角的示意图，例如，反射式增亮膜2的透过轴21和λ/4波片3的慢轴31的夹角为45度。相应的，下偏光片5的透过轴与增亮膜2的透过轴21平行(未示出)。
例如，下偏光片5为吸收式偏光片。下偏光片5能够对与其透过轴不一 致的光进行吸收。
例如，导光板1可以采用多种各向同性材料制备，例如采用玻璃制备，也可以采用硬质的聚甲基丙烯酸甲脂(有机玻璃)等制备。
例如，导光板1为玻璃导光板。采用硬度较高且热膨胀系数较低的玻璃制备导光板1利于实现导光板1的薄型化，且玻璃为各向同性材料，光在其中传播时不会发生偏振方向的改变。
例如，导光板1为硬质的聚甲基丙烯酸甲脂导光板。硬质的聚甲基丙烯酸甲脂导光板为各向同性材料，光在其中传播时不会发生偏振方向的改变。
例如，反射膜4为增强镜面反射膜。例如，反射膜4的厚度为2-5微米。
在本发明上述实施例提供的导光结构中，采用反射式增亮膜和λ/4波片进行配合，使得与反射式增亮膜的透过轴不一致的出射光被反射式增亮膜反射，经λ/4波片后转换为左旋圆偏振光进入导光板，再经反射膜反射并转换为右旋圆偏振光进入导光板，再经λ/4波片转换为与反射式增亮膜的透过轴一致的线偏振光后通过反射式增亮膜，从而减少光在传播过程中的损失，提高光的利用率。
参见图3，本发明实施例还提供一种背光模组20，包括如上任一所述的导光结构10，还包括光源6，光源6设置于导光板1的侧面13处。
在本发明实施例提供的背光模组中，背光模组的导光结构采用反射式增亮膜和λ/4波片进行配合，使得与反射式增亮膜的透过轴不一致的光线被反射式增亮膜反射，经λ/4波片后转换为左旋圆偏振光进入导光板，再经反射膜反射并转换为右旋圆偏振光进入导光板，再经λ/4波片转换为与反射式增亮膜的透过轴一致的线偏振光后通过反射式增亮膜，从而减少光在传播过程中的损失，提高光的利用率。
参见图4，本发明实施例还提供一种显示装置，包括显示面板7，还包括如上任一所述的背光模组20，背光模组20设置于显示面板7的非显示侧。
例如，显示装置还包括上偏光片8，上偏光片8设置于显示面板7的显示侧，且上偏光片8的透过轴与导光结构10的下偏光片5的透过轴平行或垂直。
在本发明实施例提供的显示装置中，背光模组的导光结构采用反射式增亮膜和λ/4波片进行配合，使得与反射式增亮膜的透过轴不一致的出射光 被反射式增亮膜反射，经λ/4波片后转换为左旋圆偏振光进入导光板，再经反射膜反射并转换为右旋圆偏振光进入导光板，再经λ/4波片转换为与反射式增亮膜的透过轴一致的线偏振光后通过反射式增亮膜，从而减少光在传播过程中的损失，提高光的利用率。
以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。
本申请要求于2015年6月19日递交的中国专利申请第201510346533.X号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (9)

  1. 一种导光结构，包括：
    导光板，所述导光板包括相对设置的出光面和反射面，以及连接所述出光面和反射面的侧面，其中，所述导光板的材料为各向同性材料；
    反射式增亮膜，所述反射式增亮膜设置于所述导光板的出光面所在侧；
    λ/4波片，所述λ/4波片设置于所述导光板的出光面和所述反射式增亮膜之间，且所述λ/4波片的慢轴与所述反射式增亮膜的透过轴的夹角为45度；以及
    反射膜，所述反射膜设置于所述导光板的反射面所在侧。
  2. 如权利要求1所述的导光结构，还包括下偏光片，所述下偏光片设置于所述反射式增亮膜上方，所述下偏光片的透过轴与所述反射式增亮膜的透过轴平行。
  3. 如权利要求2所述的导光结构，其中，所述下偏光片为吸收式偏光片。
  4. 如权利要求1至3任一项所述的导光结构，其中，所述导光板为玻璃导光板或硬质的聚甲基丙烯酸甲脂导光板。
  5. 如权利要求1至4任一项所述的导光结构，其中，所述反射膜为增强镜面反射膜。
  6. 如权利要求1至5任一项所述的导光结构，其中，所述反射膜的厚度为2-5微米。
  7. 一种背光模组，包括如权利要求1至6任一项所述的导光结构；以及光源，所述光源设置于所述导光板的侧面处。
  8. 一种显示装置，包括显示面板；以及如权利要求7所述的背光模组，所述背光模组设置于所述显示面板的非显示侧。
  9. 如权利要求8所述的显示装置，还包括上偏光片，所述上偏光片设置于所述显示面板的显示侧，且所述上偏光片的透过轴与所述导光结构的所述反射式增亮膜的透过轴平行或垂直。
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