WO2016173085A1 - 导光板及使用该导光板的背光模组 - Google Patents

导光板及使用该导光板的背光模组 Download PDF

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Publication number
WO2016173085A1
WO2016173085A1 PCT/CN2015/080596 CN2015080596W WO2016173085A1 WO 2016173085 A1 WO2016173085 A1 WO 2016173085A1 CN 2015080596 W CN2015080596 W CN 2015080596W WO 2016173085 A1 WO2016173085 A1 WO 2016173085A1
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WIPO (PCT)
Prior art keywords
light
guide plate
light source
source portion
light guide
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PCT/CN2015/080596
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English (en)
French (fr)
Inventor
陈玲艳
张彦学
刘中杰
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深圳市华星光电技术有限公司
武汉华星光电技术有限公司
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Priority to US14/764,602 priority Critical patent/US9798065B2/en
Publication of WO2016173085A1 publication Critical patent/WO2016173085A1/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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a light guide plate and a backlight module using the same.
  • the liquid crystal display itself cannot emit light, and it is necessary to use a backlight module as a light source of the liquid crystal display.
  • the light guide plate is an important component in the backlight module, and is used for guiding the light source to emit a light beam, and converting the line light source or the point light source into a surface light source.
  • the light guide plate emits light incident on the end face by 90° from the front side by cleverly utilizing the principle of total reflection of light on the interface of the transparent plate. In order to extract the total reflected light in the light guide plate from the working surface of the light guide plate, it is necessary to engrave some microstructure on the light guide plate to scatter the light when striking the microstructure, thereby obtaining a uniform brightness of a certain brightness on the working surface. Output.
  • a V-shaped groove microstructure 11 is disposed on the surface of the light guide plate 1.
  • the advantage of the light guide plate is that the light can be effectively led out and has a certain convergence effect on the light, which is beneficial to the improvement of the light utilization efficiency. It can increase the brightness and make the backlight module thinner.
  • the V-shaped groove microstructure of the light guide plate is straight, so that the light collecting plate has a better light collecting effect in a single direction, and is easy to generate when light passes through the light guide plate. Interference fringes, so the uniformity is poor.
  • an embodiment of the present invention provides a light guide plate having a light emitting surface, and the light emitting surface is provided with a plurality of V-shaped grooves, and the V-shaped grooves extend along a curved path.
  • the curved path has a circular arc shape
  • the light emitting surface has a near light source portion and a far light source portion
  • the V-shaped grooves are arranged one by one from the near light source portion of the light emitting surface to the far light source portion thereof, and
  • the near light source portion of the light exiting surface is located on a concave side of the curved path of each of the V-shaped grooves.
  • the adjacent V-shaped groove spaces are gradually narrowed.
  • the center of the curved path of each of the V-shaped grooves is located on the same straight line.
  • the curved path of the first V-shaped groove is an arc including at least two segments that are sequentially connected.
  • the curved path of the first V-shaped groove includes a first circular arc, a second circular arc, and a third circular arc that are sequentially connected, and the first circular arc and the third circular arc are related to the
  • the line is symmetrical, and the second arc is self-symmetric with respect to the line.
  • the plurality of V-shaped grooves include a first V-shaped groove and a second V-shaped groove
  • the first V-shaped groove is from the near-light source portion of the light-emitting surface Extending to the far light source portion
  • the extending direction of the second V-shaped groove is perpendicular to the extending direction of the first V-shaped groove
  • the second V-shaped groove is close to the near light source of the light emitting surface unit.
  • the curved path is a sinusoidal waveform, a triangular waveform, a sawtooth waveform or a rectangular waveform.
  • the curved path of the first V-shaped groove is fractured.
  • the embodiment of the invention further provides a backlight module, comprising the above-mentioned light guide plate and a light source assembly disposed opposite to the light source portion of the light guide plate.
  • the light guide plate and the backlight module provided by the embodiment of the invention have the beneficial effects that the V-shaped groove of the light guide plate extends along the curved path in the embodiment of the invention, thereby avoiding the light guide plate collecting light in a single direction and reducing the interference of the light guide plate.
  • the generation of streaks improves the uniformity of illumination of the light guide plate.
  • FIG. 1 is a schematic structural view of a light guide plate in the prior art
  • Figure 2 is a side view of the light guide plate shown in Figure 1;
  • FIG. 3 is a schematic structural view of a first embodiment of a light guide plate according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a second embodiment of a light guide plate according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural view of a third embodiment of a light guide plate according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural view of a fourth embodiment of a light guide plate according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural view of a first embodiment of a backlight assembly according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural view of a second embodiment of a backlight assembly according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural view of a third embodiment of a backlight assembly according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural view of a fourth embodiment of a backlight assembly according to an embodiment of the present invention.
  • an embodiment of the present invention provides a light guide plate 100.
  • the light guide plate 100 has a light emitting surface 110.
  • the light emitting surface 110 is provided with a plurality of V-shaped grooves 120.
  • the V-shaped grooves 120 extend along a curved path. .
  • the V-shaped groove 120 of the light guide plate extends along the curved path, thereby avoiding the light guide plate 100 collecting light in a single direction, reducing the generation of interference fringes of the light guide plate 100, thereby improving the uniformity of illumination of the light guide plate 100.
  • the curved path has a circular arc shape
  • the light-emitting surface 110 has a near-light source portion 111 and a far-light source portion 112. From the near-light source portion 111 of the light-emitting surface 110 to the far-light source portion 112, a plurality of V-shaped grooves 120 are formed. Arranged one by one, and the near light source portion 111 of the light exit surface 110 is located on the concave side of the curved path of each of the V-shaped grooves 120.
  • the adjacent V-shaped grooves 120 are gradually narrowed from the near-light source portion 111 of the light-emitting surface 110 to the far-light source portion 112 thereof. Near the near-light source portion 111, the V-shaped groove 120 is arranged sparsely, avoiding the generation of the hotspot phenomenon, and at a position away from the near-light source 111, the V-shaped groove 120 is arranged densely, which is farther away from the near-light source 111. The luminance of the illuminating area.
  • each V-shaped groove 120 is located on the same straight line 101. Further, each V-shaped groove 120 is symmetrical with respect to the straight line 101, and a symmetrical V-shaped groove 120 is adopted, so that the light-emitting areas located on both sides of the straight line 101 can produce the same light-emitting effect, further improving the uniform light emission of the embodiment of the present invention. degree.
  • the curved path of the first V-shaped groove 120 is a circular arc including at least two segments that are sequentially connected from the near-light source portion 111 of the light-emitting surface 110 to the far-light source portion 112 thereof.
  • the curved path of the first V-shaped groove 120 includes a first circular arc 120a, a second circular arc 120b, and a third circular arc 120c that are sequentially connected, and the first circular arc 120a and the third circular arc 120c are related to the straight line 101.
  • the second arc 120b is self-symmetric with respect to the straight line 101.
  • the first V-shaped groove 120 is arranged in a three-segment arc shape, which further avoids the occurrence of the hotspot phenomenon at the near-light source 111.
  • the curved path is wavy
  • the plurality of V-shaped grooves 120 include a first V-shaped groove 121 and a second V-shaped groove 122.
  • the first V-shaped groove 121 is from the light-emitting surface 110.
  • the near light source portion 111 extends to the far light source portion 112, the extending direction of the second V-shaped groove 122 is perpendicular to the extending direction of the first V-shaped groove 121, and the second V-shaped groove 122 is adjacent to the light emitting surface 110.
  • the light source unit 111 is in close proximity.
  • the curved path is a sinusoidal waveform, a triangular waveform, a sawtooth waveform or a rectangular waveform.
  • the curved path of the first V-shaped groove 121 is broken or continuous.
  • the wavelength of the curved path of the first V-shaped groove 121 is gradually shortened.
  • the V-shaped groove 120 is arranged sparsely, avoiding the generation of the hotspot phenomenon, and at a position away from the near-light source 111, the V-shaped groove 120 is arranged densely, which is farther away from the near-light source 111.
  • the luminance of the illuminating area is arranged sparsely, avoiding the generation of the hotspot phenomenon.
  • the embodiment of the present invention further provides a backlight module including the above-mentioned light guide plate 100 and a light source assembly 200 disposed opposite to the light source portion 111 of the light guide plate 100.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板（100），具有出光面（110），出光面（110）设置有若干条V形凹槽（120），V形凹槽（120）沿曲线路径延伸。该V形凹槽（120）沿曲线路径延伸，避免了导光板（100）在单一方向集光，减少了导光板（100）的干涉条纹的产生，从而提高了导光板（100）的发光均匀度。

Description

导光板及使用该导光板的背光模组 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种导光板及使用该导光板的背光模组。
背景技术
液晶显示器本身不能发光，需要利用背光模组来作为液晶显示器的光源。其中，导光板是背光模组中的重要组件，用于引导光源发出光束的传输方向，将线光源或点光源转换成面光源出射。导光板是通过巧妙利用光在透明板界面上全反射的原理，将端面入射的光偏转90°从正面射出。为了将导光板中的全反射光从导光板的工作面上导出，需要在导光板上雕刻一些微结构，使光在撞击到该微结构时进行散射，从而在工作面获得一定亮度的均匀光输出。
为了进一步提高面板辉度与节省能耗，模组V-cut技术应运而生。如图1和图2，在导光板1表面设置V形凹槽微结构11，此类导光板的优势是可将光线有效导出的同时对光线有一定的收敛作用，有利于光利用率的提升，可提高辉度并将背光模组薄型化。
但是在现有的模组V-cut技术中，导光板的V形凹槽微结构呈直条状，使得导光板在单一方向的集光效果较佳，当光线通过该导光板时，容易产生干涉条纹，故均匀度较差。
发明内容
本发明的目的在于提供一种均匀度更好的导光板。
为了解决上述技术问题，本发明实施例提供了一种导光板，所述导光板具有一出光面，所述出光面设置有若干条V形凹槽，所述V形凹槽沿曲线路径延伸。
其中，所述曲线路径呈圆弧形，所述出光面具有近光源部和远光源部，从所述出光面的近光源部至其远光源部，所述V形凹槽逐条排布，且所述出光面的近光源部位于每条所述V形凹槽的曲线路径的凹侧。
其中，从所述出光面的近光源部至其远光源部，相邻的所述V形凹槽间隔逐渐缩小。
其中，每条所述V形凹槽的曲线路径的中心位于同一条直线。
其中，从所述出光面的近光源部至其远光源部，第一条所述V形凹槽的曲线路径为包含至少2段依次相接的圆弧。
其中，第一条所述V形凹槽的曲线路径包含依次相接的第一圆弧、第二圆弧和第三圆弧，所述第一圆弧和所述第三圆弧关于所述直线对称，所述第二圆弧关于所述直线自对称。
其中，所述曲线路径呈波浪形，所述若干条V形凹槽包括第一V形凹槽和第二V形凹槽，所述第一V形凹槽从所述出光面的近光源部延伸至其远光源部，所述第二V形凹槽的延伸方向垂直于所述第一V形凹槽的延伸方向，且所述第二V形凹槽靠近于所述出光面的近光源部。
其中，所述曲线路径呈正弦波形、三角波形、锯齿波形或矩形波形。
其中，所述第一V形凹槽的曲线路径呈断裂状。
本发明实施例还提供了一种背光模组，包括上述的导光板以及与所述导光板的近光源部相对设置的光源组件。
本发明实施例提供的导光板及背光模组，其有益效果在于，本发明实施例导光板的V形凹槽沿曲线路径延伸，避免了导光板在单一方向集光，减少了导光板的干涉条纹的产生，从而提高了该导光板的发光均匀度。
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，还可以根据这些附图获得其他的附图。
图1是现有技术中的导光板的结构示意图；
图2是图1所示的导光板的侧视图；
图3是本发明实施例导光板第一实施方式的结构示意图；
图4是本发明实施例导光板第二实施方式的结构示意图；
图5是本发明实施例导光板第三实施方式的结构示意图；
图6是本发明实施例导光板第四实施方式的结构示意图；
图7是本发明实施例背光组件第一实施方式的结构示意图；
图8是本发明实施例背光组件第二实施方式的结构示意图；
图9是本发明实施例背光组件第三实施方式的结构示意图；
图10是本发明实施例背光组件第四实施方式的结构示意图。
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。
参照图3至图6，本发明实施例提供了一种导光板100，导光板100具有一出光面110，出光面110设置有若干条V形凹槽120，V形凹槽120沿曲线路径延伸。本发明实施例导光板的V形凹槽120沿曲线路径延伸，避免了导光板100在单一方向集光，减少了导光板100的干涉条纹的产生，从而提高了该导光板100的发光均匀度。
进一步参照图3，该曲线路径呈圆弧形，出光面110具有近光源部111和远光源部112，从出光面110的近光源部111至其远光源部112，若干条V形凹槽120逐条排布，且出光面110的近光源部111位于每条V形凹槽120的曲线路径的凹侧。
其中，从出光面110的近光源部111至其远光源部112，相邻的V形凹槽120间隔逐渐缩小。在靠近近光源部111处，V形凹槽120排布较疏，避免了hotspot现象的产生，而在远离近光源111处，V形凹槽120的排布较密，提高了远离近光源111的发光区域的辉度。
其中，每条V形凹槽120的曲线路径的中心位于同一条直线101。进一步地，每条V形凹槽120关于直线101对称，采用对称的V形凹槽120，可以使得位于直线101两侧的发光区域产生相同的发光效果，进一步提高了本发明实施例的发光均匀度。
其中，从出光面110的近光源部111至其远光源部112，第一条V形凹槽120的曲线路径为包含至少2段依次相接的圆弧。
其中，第一条V形凹槽120的曲线路径包含依次相接的第一圆弧120a、第二圆弧120b和第三圆弧120c，第一圆弧120a和第三圆弧120c关于直线101对称，第二圆弧120b关于直线101自对称。将第一条V形凹槽120设置为三段圆弧状，进一步避免了近光源处111的hotspot现象的产生。
进一步参照图4至图6，该曲线路径呈波浪形，若干条V形凹槽120包括第一V形凹槽121和第二V形凹槽122，第一V形凹槽121从出光面110的近光源部111延伸至其远光源部112，第二V形凹槽122的延伸方向垂直于第一V形凹槽121的延伸方向，且第二V形凹槽122靠近于出光面110的近光源部111。
其中，该曲线路径呈正弦波形、三角波形、锯齿波形或矩形波形。
其中，第一V形凹槽121的曲线路径呈断裂状或连续形。
进一步而言，从近光源部111至远光源部112，第一V形凹槽121的曲线路径的波长逐渐缩短。在靠近近光源部111处，V形凹槽120排布较疏，避免了hotspot现象的产生，而在远离近光源111处，V形凹槽120的排布较密，提高了远离近光源111的发光区域的辉度。
进一步而言，本发明实施例还提供了一种背光模组，包括上述的导光板100以及与导光板100的近光源部111相对设置的光源组件200。
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 (15)

  1. 一种导光板，所述导光板具有一出光面，其特征在于，所述出光面设置有若干条V形凹槽，每一所述V形凹槽沿曲线路径延伸。
  2. 根据权利要求1所述的导光板，其特征在于，所述曲线路径呈圆弧形，所述出光面具有近光源部和远光源部，从所述出光面的近光源部至其远光源部，所述V形凹槽逐条排布，且所述出光面的近光源部位于每条所述V形凹槽的曲线路径的凹侧。
  3. 根据权利要求2所述的导光板，其特征在于，从所述出光面的近光源部至其远光源部，相邻的所述V形凹槽间隔逐渐缩小。
  4. 根据权利要求2所述的导光板，其特征在于，每条所述V形凹槽的曲线路径的中心位于同一条直线。
  5. 根据权利要求3所述的导光板，其特征在于，每条所述V形凹槽的曲线路径的中心位于同一条直线。
  6. 根据权利要求2所述的导光板，其特征在于，从所述出光面的近光源部至其远光源部，第一条所述V形凹槽的曲线路径为包含至少2段依次相接的圆弧。
  7. 根据权利要求3所述的导光板，其特征在于，从所述出光面的近光源部至其远光源部，第一条所述V形凹槽的曲线路径为包含至少2段依次相接的圆弧。
  8. 根据权利要求4所述的导光板，其特征在于，从所述出光面的近光源部至其远光源部，第一条所述V形凹槽的曲线路径为包含至少2段依次相接的圆弧。
  9. 根据权利要求5所述的导光板，其特征在于，从所述出光面的近光源部至其远光源部，第一条所述V形凹槽的曲线路径为包含至少2段依次相接的圆弧。
  10. 根据权利要求5所述的导光板，其特征在于，第一条所述V形凹槽的曲线路径包含依次相接的第一圆弧、第二圆弧和第三圆弧，所述第一圆弧和所述第三圆弧关于所述直线对称，所述第二圆弧关于所述直线自对称。
  11. 根据权利要求1所述的导光板，其特征在于，所述曲线路径呈波浪形，所述若干条V形凹槽包括第一V形凹槽和第二V形凹槽，所述第一V形凹槽从所述出光面的近光源部延伸至其远光源部，所述第二V形凹槽的延伸方向垂直于所述第一V形凹槽的延伸方向，且所述第二V形凹槽靠近于所述出光面的近光源部。
  12. 根据权利要求11所述的导光板，其特征在于，所述曲线路径呈正弦波形、三角波形、锯齿波形或矩形波形。
  13. 根据权利要求11所述的导光板，其特征在于，所述第一V形凹槽的曲线路径呈断裂状。
  14. 根据权利要求12所述的导光板，其特征在于，所述第一V形凹槽的曲线路径呈断裂状。
  15. 一种背光模组，其特征在于，包括权利要求1-14任一项所述的导光板以及与所述导光板的近光源部相对设置的光源组件。
PCT/CN2015/080596 2015-04-28 2015-06-02 导光板及使用该导光板的背光模组 WO2016173085A1 (zh)

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