WO2016206148A1 - 导光板、背光模组及显示装置 - Google Patents

导光板、背光模组及显示装置 Download PDF

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Publication number
WO2016206148A1
WO2016206148A1 PCT/CN2015/084281 CN2015084281W WO2016206148A1 WO 2016206148 A1 WO2016206148 A1 WO 2016206148A1 CN 2015084281 W CN2015084281 W CN 2015084281W WO 2016206148 A1 WO2016206148 A1 WO 2016206148A1
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WO
WIPO (PCT)
Prior art keywords
light
layer
light incident
incident surface
guide plate
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PCT/CN2015/084281
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English (en)
French (fr)
Inventor
曾杰
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武汉华星光电技术有限公司
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Application filed by 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to GB1711317.6A priority Critical patent/GB2549890B/en
Priority to JP2017560981A priority patent/JP6441507B2/ja
Priority to US14/774,184 priority patent/US9798073B2/en
Priority to KR1020177021753A priority patent/KR102005651B1/ko
Publication of WO2016206148A1 publication Critical patent/WO2016206148A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0883—Mirrors with a refractive index gradient
    • 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
    • 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
    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • 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
    • G02F1/133553—Reflecting elements
    • 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 liquid crystal display technologies, and in particular, to a light guide plate, a backlight module, and a display device.
  • Liquid crystal displays are the mainstream flat panel display technology on the market today.
  • the display device requires a backlight to illuminate the liquid crystal display as a light source.
  • the conventional backlight module comprises a backlight composed of LEDs.
  • the light of the backlight is converted into a surface light source through the light guide plate, and is emitted from the backlight module through the uniformity of the diffusion sheet, and the liquid crystal panel can display us.
  • the light guide plate is an important part of the backlight module.
  • the existing light guide plate works by extracting the light emitted from the lamp through the optical grade acrylic plate.
  • the light guide plate can be uniformly illuminated through various dense and different light guiding mesh points. .
  • some of the light is refracted from the bottom of the light guide plate. Therefore, the reflective sheet is required to reflect the light exposed from the bottom surface back to the light guide plate to improve the efficiency of use of the light, and a part of the light guide plate is vertically emitted from the upper portion of the halftone dot, that is, the light guide plate. Light leakage is still generated in combination with the reflector, and the light source cannot be fully utilized.
  • the technical problem to be solved by the present invention is to provide a light guide plate and a backlight module, which solves the technical problem of light leakage of the light guide plate.
  • the invention also provides a display device.
  • the present invention provides a light guide plate including a first light guiding layer, a second light guiding layer and a connecting layer, wherein refractive indices of the first light guiding layer, the connecting layer and the second light guiding layer are sequentially decreased;
  • the first light guiding layer includes a first light incident surface, a first inclined surface and a light emitting surface, and the first inclined surface is connected to the first light incident surface and the light exit surface;
  • the second light guiding layer includes a first side surface, a bottom surface, and a second inclined surface connecting the bottom surface and the first side surface;
  • the connecting layer is provided with a main reflective layer and a sub-reflecting layer laminated with the main reflective layer, wherein the main reflective layer is
  • the dots are alternately arranged with the dots in the secondary reflective layer, and the first reflective surface formed by the dots of the primary reflective layer is parallel and oriented in the same direction as the second reflective surface of the dots of the secondary reflective layer;
  • the connection layer is fixed to the first guide Between the light layer and
  • the connecting layer is an integrally formed thin plate, and the dots in the main reflective layer and the dots in the secondary reflective layer are located in the connecting layer and respectively disposed near two opposite outer surfaces of the connecting layer.
  • the connecting layer further includes a second light incident surface and a second side surface opposite to the second light incident surface, and the second light incident surface and the second side surface are connected to the first reflective surface and the second reflective surface.
  • the first light incident surface and the second light incident surface are in the same plane and are connected to form a light incident surface of the light guide plate; the first side surface and the second side surface are in the same plane and are connected to form a side opposite to the light incident surface. .
  • the cross section of the first light guiding layer perpendicular to the first light incident surface is a right triangle; the cross section of the second light guiding layer perpendicular to the first side direction is a right triangle.
  • the first light incident surface is disposed at an angle with the first inclined surface, and the angle of the included angle is between 30 and 60 degrees.
  • the size and density of the dots in the main reflective layer gradually increase as the distance from the first light incident surface increases.
  • the present invention provides a backlight module.
  • the backlight module includes a plastic frame, a backlight, an optical film, and the light guide plate.
  • the light guide plate, the backlight, and the optical film are disposed in the plastic frame.
  • the optical film is disposed on the first light incident surface of the light guide plate, and the optical film is disposed on the light emitting surface.
  • the present invention provides a display device including the backlight module and a liquid crystal panel mounted on a side of the backlight module provided with an optical film.
  • the light guide plate of the present invention is formed by a first light guiding layer, a second light guiding layer and a connecting layer sandwiched between the first light guiding layer and the second light guiding layer, and the connecting layer will pass through the first light incident surface
  • the light that causes the light leakage position is reflected back to the first light guiding layer, and then the light emitting surface is emitted, which reduces the waste of the light source and improves the utilization of the light.
  • FIG. 1 is a schematic cross-sectional view of a light guide plate in a preferred embodiment of the present invention, wherein the light guide plate is in an exploded state.
  • FIG. 2 is a schematic cross-sectional view showing the light guide plate of the present invention after assembly.
  • FIG. 3 is a schematic view of light passing through the light guide plate shown in FIG. 2.
  • a preferred embodiment of the present invention provides a light guide plate 10, which includes a first light guiding layer 11, a second light guiding layer 13, and a connecting layer 15, The refractive indices of the light guiding layer 11, the connecting layer 15, and the second light guiding layer 13 are sequentially decreased.
  • the first light guiding layer 11 includes a first light incident surface 111, a first inclined surface 112, and a light emitting surface 113.
  • the first inclined surface 112 connects the first light incident surface 111 and the light exit surface 113.
  • the second light guiding layer The 113 includes a first side surface 131, a bottom surface 132, and a second slope 133 connecting the bottom surface 132 and the first side surface 131.
  • the connection layer 15 is provided with a main reflection layer 151 and a sub-reflection layer 153 laminated with the main reflection layer 151.
  • the dots 1511 in the main reflection layer 151 are interlaced with the dots 1531 in the sub-reflection layer 153, and the main reflection is
  • the halftone dots 1511 of the layer 151 constitute a first reflecting surface which is parallel to the second reflecting surface constituted by the halftone dots 1531 of the sub-reflecting layer 153 and has the same direction.
  • the connecting layer 15 is fixed between the first light guiding layer 11 and the second light guiding layer 13 , the first inclined surface 112 is in contact with the first reflecting surface, and the second inclined surface 133 is opposite to the second reflecting surface The surface fits.
  • the cross section of the first light guiding layer 11 perpendicular to the first light incident surface 111 is a right triangle; the cross section of the second light guiding layer 13 perpendicular to the first side surface 131 is a right triangle. That is, the first light guiding layer 11 and the second light guiding layer 13 are right-angled triangular thin plates, and the first inclined surface 112 and the second inclined surface 133 are triangular inclined surfaces.
  • the light emitting surface 113 is disposed in parallel with the bottom surface 112.
  • the first side surface 131 is disposed opposite to the first light incident surface 111, and the first light guiding layer is disposed.
  • the second light guiding layer 13 and the connecting layer 15 constitute a rectangular plate-shaped light guiding plate 10.
  • the connecting layer 15 is an integrally formed thin plate, which is mainly made of an optical grade acrylic plate or a PC material.
  • the dots 1511 in the main reflective layer 151 and the dots 1531 in the secondary reflective layer 153 are located in the connecting layer 15 and are respectively disposed adjacent to the opposite outer surfaces 155, 156 of the connecting layer 15, that is, the dots 1511 and A dot 1531 is provided in the connection layer 15.
  • the first reflective surface is the outer surface 155.
  • the second reflecting surface is disposed in the connecting layer 15 in parallel with the first reflecting surface, and is disposed opposite to the outer surface 156.
  • the light enters the connecting layer 15, the light is reflected by the main reflective layer 151, and the light leaked through the main reflective layer 151 is reflected back to the light surface 113 by the second reflecting surface, thereby fully utilizing the light to ensure the light guide plate. Light guiding efficiency.
  • the connecting layer 15 further includes a second light incident surface 157 and a second side surface 158 opposite to the second light incident surface 157.
  • the second light incident surface 157 and the second side surface 158 are connected to the first reflective surface.
  • the first inclined surface 112 is in contact with the first reflective surface
  • the second inclined surface 133 is in contact with the surface facing away from the second reflective surface
  • the light-emitting surface 113 is disposed in parallel with the bottom surface 112.
  • the first side surface 131 is disposed in parallel with the first light incident surface 111, and the first light guiding layer 11, the second light guiding layer 13, and the connecting layer 15 constitute a rectangular plate-shaped light guiding plate 10;
  • the first light incident surface 111 and the second light incident surface 157 are in the same plane and are connected to form a light incident surface of the light guide plate 10;
  • the first side surface 131 and the second side surface 157 are in the same plane and are connected to form a light incident surface.
  • first light incident surface 111 is disposed at an angle with the first inclined surface 112, and the angle of the angle A is between 30 and 60 degrees.
  • the angle of the angle A may be such that the main reflective layer 151 can achieve total reflection.
  • the size and density of the dots 1511 in the main reflective layer 151 gradually increase as the distance from the first light incident surface 111 increases. That is to say, the mesh point 1511 located in the same plane in the main reflective layer 151 is larger than the first light incident surface 111, and the larger the distance is, the larger the dot density is, and the fiber is from the first light incident surface.
  • the main reflective layer 151 away from the light incident surface achieves the same astigmatism effect as the near-into-light surface position.
  • the light guiding effect of the light guide plate is illustrated.
  • the light of the light source enters the first light guiding layer 11 from the first light incident surface 111 and the second light incident surface 157.
  • the connecting layer 15 the light that causes the light leakage of the light guide plate can be roughly divided into three angles to enter the light guide plate: light A, light B and light C as shown in the figure, and the light A is compared with the first input.
  • the smooth surface 111 obliquely enters the first reflecting surface formed by the halftone dot 1511 of the main reflective layer 151, and reflects the light emitting surface 113 through the first reflecting surface.
  • the light B is the light that is exposed from the dot 1511 of the main reflective layer 151, and then is incident on the second reflective layer of the secondary reflective layer 153, and is reflected by the second reflective surface back to the first light guiding layer 11 to emit the light emitting surface 113.
  • the light C is vertically reflected from the first light incident surface 111 into the first light guiding layer 11 and reflected by the first reflective layer. Since the refractive index of the first light guiding layer 11 is smaller than the refractive index of the main reflective layer 151, Moreover, in the presence of the clip angle A, the light C can be totally reflected and emitted to the light exit surface 113. Therefore, light that may leak light is mostly reflected back to the first light guiding layer 11 after passing through the connecting layer 15, thereby avoiding waste of a large amount of light and increasing light utilization efficiency.
  • the light guide plate 10 of the present invention is formed by the first light guiding layer 11 , the second light guiding layer 13 and the connecting layer 15 sandwiched between the first light guiding layer 11 and the second light guiding layer 13 , and the connecting layer 15
  • the light that passes through the first light incident surface to generate the light leakage position is reflected back to the first light guiding layer 11 and then exits the light emitting surface 113, thereby reducing the waste of the light source and improving the utilization of the light.
  • the present invention further provides a backlight module (not shown), which comprises a plastic frame, a backlight, an optical film, and the light guide plate, wherein the light guide plate, the backlight, and the optical film are disposed in the plastic frame.
  • the backlight is located on the first light incident surface of the light guide plate, and the optical film is disposed on the light exit surface.
  • the light exit surface 113 is emitted, and other similar light rays are emitted.
  • the light B and the angle of the light C are reflected by the connecting layer 15 to the light emitting surface, fully utilizing the power of the backlight module to provide light.
  • the present invention also provides a display device (not shown) including the backlight module and a liquid crystal panel mounted on a side of the backlight module provided with an optical film.

Abstract

一种导光板（10）、背光模组及显示装置，导光板(10)包括第一导光层(11)、第二导光层(13)及连接层(15)，所述第一导光层(11)、连接层(15)及第二导光层(13)的折射率依次减小；所述第一导光层(11)包括第一入光面(111)、第一斜面(112)及出光面(113)；所述第二导光层(13)包括第一侧面(131)、底面(132)及连接底面(132)与第一侧面(131)的第二斜面(133)；所述连接层(15)设有主反射层(151)及与主反射层(151)层叠设置的副反射层(153)，所述主反射层(151)内的网点(1511)与副反射层(153)内的网点(1531)交错设置，并且主反射层(151)的网点(1511)构成的第一反射面与副反射层(153)的网点(1531)构成的第二反射面平行且朝向相同；所述连接层(15)固定于第一导光层(11)与第二导光层(13)之间，所述第一斜面(112)与第一反射面贴合，所述第二斜面(133)与第二反射面背向的表面贴合，所述出光面(113)平行于所述底面(132)。

Description

导光板、背光模组及显示装置
本发明要求2015年6月24日递交的发明名称为“导光板、背光模组及显示装置”的申请号201510353986.5的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示技术领域，特别涉及一种导光板、背光模组及显示装置。
背景技术
液晶显示器是当今市场上的主流平板显示装置技术。而显示装置都需要背光来作为光源点亮液晶显示器。传统的背光模组包括LED组成的背光源，背光源的光线经过导光板将光源转化成面光源射出，经过扩散片的匀光作用，从背光模组出射，经过液晶面板后即可显示出我们所需要的图像。其中，导光板为背光模组中重要组成部分，
现有的导光板工作是通过光学级亚克力板材吸取从灯发出来的光，当光线射到各个导光网点时，通过各种疏密、大小不一的导光网点，可使导光板均匀发光。但是，有一部分光线从导光板底部折射出去，所以需要反射片将底面露出的光反射回导光板中，提高光的使用效率，还有一部分会从网点上部垂直射出导光板，也就是说导光板结合反光片依然会产生漏光，光源无法被充分利用。
发明内容
本发明所要解决的技术问题在于提供一种导光板及背光模组，解决导光板漏光的技术问题。
本发明还提供一种显示装置。
本发明提供一种导光板，其包括第一导光层、第二导光层及连接层，所述第一导光层、连接层及第二导光层的折射率依次减小；所述第一导光层包括第一入光面、第一斜面及出光面，所述第一斜面连接第一入光面与出光面；所述 第二导光层包括第一侧面、底面及连接底面与第一侧面的第二斜面；所述连接层设有主反射层及与主反射层层叠设置的副反射层，所述主反射层内的网点与副反射层内的网点交错设置，并且主反射层的网点构成的第一反射面与副反射层的网点构成的第二反射面平行且朝向相同；所述连接层固定于第一导光层与第二导光层之间，所述第一斜面与第一反射面贴合，所述第二斜面与第二反射面背向的表面贴合，所述出光面平行于所述底面。
其中，所述连接层为一体成型的薄板，所述主反射层内的网点与副反射层内的网点位于所述连接层内并分别靠近连接层的两个相反的外表面设置。
其中，所述连接层还包括第二入光面及与第二入光面相对的第二侧面，所述第二入光与所述第二侧面连接第一反射面与第二反射面。
其中，所述第一入光面与第二入光面位于同一平面并连接形成导光板的入光面；所述第一侧面与第二侧面位于同一平面并连接形成与入光面相对的侧面。
其中，所述第一导光层垂直于第一入光面方向的截面为直角三角形；所述第二导光层垂直于第一侧面方向的截面为直角三角形。
其中，所述第一入光面与所述第一斜面呈夹角设置，所述夹角的角度在30-60度之间。
其中，所述主反射层内的网点的尺寸及密度随着远离第一入光面的距离增加而逐渐增大。
本发明提供一种背光模组，背光模组包括胶框、背光源、光学薄膜及所述的导光板，所述导光板、背光源及光学薄膜设于所述胶框内，所述背光源位于所述导光板的第一入光面，所述光学薄膜盖设于所述出光面上。
本发明提供一种显示装置，其包括所述背光模组及液晶面板，所述液晶面板装于背光模组设有光学薄膜的一侧。
本发明的导光板由第一导光层、第二导光层及夹持于第一导光层与第二导光层之间的连接层形成，所述连接层将通过第一入光面的会产生漏光位置的光线反射回第一导光层，然后射出出光面，减小了光源的浪费，提高了光线的利用率。
附图说明
为了更清楚地说明本发明的技术方案，下面将对实施方式中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以如这些附图获得其他的附图。
图1是本发明较佳实施方式中的导光板截面示意图，其中导光板为分解状态。
图2是本发明的导光板组装后的截面示意图。
图3是光线经过图2所示的导光板的示意图。
具体实施方式
下面将结合本发明实施方式中的附图，对本发明实施方式中的技术方案进行清楚、完整地描述。
请参阅图1与图2，本发明的较佳实施例提供了一种导光板10，所述导光板10包括第一导光层11、第二导光层13及连接层15，所述第一导光层11、连接层15及第二导光层13的折射率依次减小。
所述第一导光层11包括第一入光面111、第一斜面112及出光面113，所述第一斜面112连接第一入光面111与出光面113；所述第二导光层113包括第一侧面131、底面132及连接底面132与第一侧面131的第二斜面133。
所述连接层15设有主反射层151及与主反射层151层叠设置的副反射层153，所述主反射层151内的网点1511与副反射层153内的网点1531交错设置，并且主反射层151的网点1511构成第一反射面与副反射层153的网点1531构成的第二反射面平行且朝向相同。所述连接层15固定于第一导光层11与第二导光层13之间，所述第一斜面112与第一反射面贴合，所述第二斜面133与第二反射面背向的表面贴合。
本实施例中，所述第一导光层11垂直于第一入光面111方向的截面为直角三角形；所述第二导光层13垂直于第一侧面131方向的截面为直角三角形。也就是说所述第一导光层11与所述第二导光层13为直角三角形薄板，所述第一斜面112、第二斜面133为三角形的斜面。当所述第一导光层11与第二导 光层13通过连接层连接固定后，所述出光面113于所述底面112平行相对设置，所述第一侧面131与所述第一入光面111平行相对设置，所述第一导光层11、第二导光层13及连接层15构成矩形的板状的导光板10。
进一步的，所述连接层15为一体成型的薄板，主要是通过光学级的亚克力板或者PC材料制成。所述主反射层151内的网点1511与副反射层153内的网点1531位于所述连接层15内并分别靠近连接层15的两个相反的外表面155、156设置，即所述网点1511及网点1531设于所述连接层15内。
具体的，所述第一反射面为所述外表面155。所述第二反射面位于所述连接层15内与所述第一反射面平行设置，并且与所述外表面156相背设置。当光线进入所述连接层15时，通过主反射层151进行反射，而穿过主反射层151漏掉的光线由第二反射面反射回出光面113，进而充分利用光线，保证了导光板的导光效率。
进一步的，所述连接层15还包括第二入光面157及与第二入光面157相对的第二侧面158，所述第二入光面157与所述第二侧面158连接第一反射面与副反射层153的第二反射面相反的表面，即外表面156。具体的，所述第一斜面112与第一反射面贴合，所述第二斜面133与第二反射面背向的表面贴合，所述出光面113于所述底面112平行相对设置，所述第一侧面131与所述第一入光面111平行相对设置，所述第一导光层11、第二导光层13及连接层15构成矩形的板状的导光板10；其中，所述第一入光面111与第二入光面157位于同一平面并连接形成导光板10的入光面；所述第一侧面131与第二侧面157位于同一平面并连接形成与入光面相对的侧面。
进一步的，所述第一入光面111与所述第一斜面112呈夹角设置，所述夹角A的角度在30-60度之间。所述夹角A的角度只要能使所述主反射层151实现全反射即可。
进一步的，所述主反射层151内的网点1511的尺寸及密度随着远离第一入光面111的距离增加而逐渐增大。也就是说，所述主反射层151内位于同一平面的网点1511相较于所述第一入光面111，距离越远尺寸越大，并且网点密度越大，档光纤从第一入光面111进入时，可以保证远离入光面的主反射层151实现与近入光面位置相同的散光效果。
请参阅图3，举例说明导光板的导光效果，所述导光板10导光时，光源的光线从第一入光面111及第二入光面157进入所述第一导光层11及所述连接层15内，会使导光板产生漏光的光线大致可分为三个角度进入导光板：如图所示的光线A、光线B及光线C，所述光线A相较于第一入光面111斜射入到主反射层151的网点1511形成的第一反射面上，经过所述第一反射面反射出出光面113。所述光线B就是从主反射层151的网点1511露出的光线，然后射到副反射层153的第二反射层上，由第二反射面反射回第一导光层11射出出光面113，进而将。光线C从第一入光面111垂直进入所述第一导光层11经所述第一反射层反射，由于第一导光层11的折射率比所述主反射层151的折射率小，而且夹角度A的存在，光线C可全部发生反射射出所述出光面113。因此，可能发生漏光的光线通过连接层15后大部分被反射回第一导光层11，，避免大量光线的浪费，增加了光线利用率。
本发明的导光板10由第一导光层11、第二导光层13及夹持于第一导光层11与第二导光层13之间的连接层15形成，所述连接层15将通过第一入光面的会产生漏光位置的光线反射回第一导光层11，然后射出出光面113，减小了光源的浪费，提高了光线的利用率。
本发明还提供一种背光模组(图未示)，其包括胶框、背光源、光学薄膜及所述的导光板，所述导光板、背光源及光学薄膜设于所述胶框内，所述背光源位于所述导光板的第一入光面，所述光学薄膜盖设于所述出光面上。
当背光源的光线从导光板10的第一入光面111及第二入光面157进入导光板10后，根据上述举例分析，除了正常的光线进行均光后射出出光面113，其他类似光线A、光线B及光线C所在角度的光线由连接层15实现反射出出光面，充分发挥了背光模组的提供光线的功率。同时，不需要额外设置反光板，节省材料。
本发明还提供一种显示装置(图未示)，其包括所述背光模组及液晶面板，所述液晶面板装于背光模组设有光学薄膜的一侧。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (19)

  1. 一种导光板，其特征在于，所述导光板包括第一导光层、第二导光层及连接层，所述第一导光层、连接层及第二导光层的折射率依次减小；所述第一导光层包括第一入光面、第一斜面及出光面，所述第一斜面连接第一入光面与出光面；所述第二导光层包括第一侧面、底面及连接底面与第一侧面的第二斜面；所述连接层设有主反射层及与主反射层层叠设置的副反射层，所述主反射层内的网点与副反射层内的网点交错设置，并且主反射层的网点构成的第一反射面与副反射层的网点构成的第二反射面平行且朝向相同；所述连接层固定于第一导光层与第二导光层之间，所述第一斜面与第一反射面贴合，所述第二斜面与第二反射面背向的表面贴合，所述出光面平行于所述底面。
  2. 如权利要求1所述的导光板，其特征在于，所述连接层为一体成型的薄板，所述主反射层内的网点与副反射层内的网点位于所述连接层内并分别靠近连接层的两个相反的外表面设置。
  3. 如权利要求2所述的导光板，其特征在于，所述连接层还包括第二入光面及与第二入光面相对的第二侧面，所述第二入光面与所述第二侧面连接第一反射面及与第二反射面相反的表面。
  4. 如权利要求3所述的导光板，其特征在于，所述第一入光面与第二入光面位于同一平面并连接形成导光板的入光面；所述第一侧面与第二侧面位于同一平面并连接形成与入光面相对的侧面。
  5. 如权利要求4所述的导光板，其特征在于，所述第一导光层垂直于第一入光面方向的截面为直角三角形；所述第二导光层垂直于第一侧面方向的截面为直角三角形。
  6. 如权利要求1所述的导光板，其特征在于，所述第一入光面与所述第一斜面呈夹角设置，所述夹角的角度在30-60度之间。
  7. 如权利要求5所述的导光板，其特征在于，所述第一入光面与所述第一斜面呈夹角设置，所述夹角的角度在30-60度之间。
  8. 如权利要求1所述的导光板，其特征在于，所述主反射层内的网点的尺寸及密度随着远离第一入光面的距离增加而逐渐增大。
  9. 如权利要求5所述的导光板，其特征在于，所述主反射层内的网点的尺寸及密度随着远离第一入光面的距离增加而逐渐增大。
  10. 一种背光模组，其特征在于，背光模组包括胶框、背光源、光学薄膜及导光板，所述导光板包括第一导光层、第二导光层及连接层，所述第一导光层、连接层及第二导光层的折射率依次减小；所述第一导光层包括第一入光面、第一斜面及出光面，所述第一斜面连接第一入光面与出光面；所述第二导光层包括第一侧面、底面及连接底面与第一侧面的第二斜面；所述连接层设有主反射层及与主反射层层叠设置的副反射层，所述主反射层内的网点与副反射层内的网点交错设置，并且主反射层的网点构成的第一反射面与副反射层的网点构成的第二反射面平行且朝向相同；所述连接层固定于第一导光层与第二导光层之间，所述第一斜面与第一反射面贴合，所述第二斜面与第二反射面背向的表面贴合，所述出光面平行于所述底面，所述导光板、背光源及光学薄膜设于所述胶框内，所述背光源位于所述导光板的第一入光面，所述光学薄膜盖设于所述出光面上。
  11. 如权利要求10所述的背光模组，其特征在于，所述连接层为一体成型的薄板，所述主反射层内的网点与副反射层内的网点位于所述连接层内并分别靠近连接层的两个相反的外表面设置。
  12. 如权利要求11所述的背光模组，其特征在于，所述连接层还包括第二入光面及与第二入光面相对的第二侧面，所述第二入光面与所述第二侧面连接第一反射面及与第二反射面相反的表面。
  13. 如权利要求12所述的背光模组，其特征在于，所述第一入光面与第二入光面位于同一平面并连接形成导光板的入光面；所述第一侧面与第二侧面位于同一平面并连接形成与入光面相对的侧面。
  14. 如权利要求13所述的背光模组，其特征在于，所述第一导光层垂直于第一入光面方向的截面为直角三角形；所述第二导光层垂直于第一侧面方向的截面为直角三角形。
  15. 如权利要求1所述的背光模组，其特征在于，所述第一入光面与所述第一斜面呈夹角设置，所述夹角的角度在30-60度之间。
  16. 如权利要求1所述的显示装置，其特征在于，所述主反射层内的网 点的尺寸及密度随着远离第一入光面的距离增加而逐渐增大。
  17. 如权利要求14所述的背光模组，其特征在于，所述第一入光面与所述第一斜面呈夹角设置，所述夹角的角度在30-60度之间。
  18. 如权利要求14所述的显示装置，其特征在于，所述主反射层内的网点的尺寸及密度随着远离第一入光面的距离增加而逐渐增大
  19. 其特征在于，包括权利要求10所述背光模组及液晶面板，所述液晶面板装于背光模组设有光学薄膜的一侧。
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CN102890306A (zh) * 2012-10-11 2013-01-23 京东方科技集团股份有限公司 导光板及其制造方法和成型模具

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US9798073B2 (en) 2017-10-24
GB2549890B (en) 2021-03-10
GB2549890A (en) 2017-11-01
US20170139116A1 (en) 2017-05-18
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CN104977648A (zh) 2015-10-14
KR20170101994A (ko) 2017-09-06

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