WO2015089858A1 - 导光板、背光模组及液晶显示装置 - Google Patents

导光板、背光模组及液晶显示装置 Download PDF

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Publication number
WO2015089858A1
WO2015089858A1 PCT/CN2013/090346 CN2013090346W WO2015089858A1 WO 2015089858 A1 WO2015089858 A1 WO 2015089858A1 CN 2013090346 W CN2013090346 W CN 2013090346W WO 2015089858 A1 WO2015089858 A1 WO 2015089858A1
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WIPO (PCT)
Prior art keywords
light
edge
guide plate
distance
light guide
Prior art date
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PCT/CN2013/090346
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English (en)
French (fr)
Inventor
贺虎
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/232,611 priority Critical patent/US20160245980A1/en
Publication of WO2015089858A1 publication Critical patent/WO2015089858A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means 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
    • G02B6/0038Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical 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
    • G02B6/0086Positioning aspects
    • G02B6/0091Positioning aspects of the light source relative to the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical 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
    • G02B6/0086Positioning aspects
    • G02B6/0088Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • Light guide plate, backlight module and liquid crystal display device are Light guide plate, backlight module and liquid crystal display device
  • the present invention relates to the field of liquid crystal display; and more particularly to a light guide plate, a backlight module, and a liquid crystal display device capable of effectively preventing light leakage.
  • Liquid crystal display devices have been widely used due to their advantages of being thin, low in power consumption, low in radiation, and the like, and have become the mainstream of displays on the market. Whether it is a laptop, a mobile phone or even a home TV, the liquid crystal display device has completely entered the human life. Because the liquid crystal molecules cannot emit light by themselves, the liquid crystal display device needs to rely on the backlight module to provide a display light source in addition to the liquid crystal panel, so as to achieve the display function.
  • micro-structured light guide plates refers to a light-emitting surface of the light guide plate containing a plurality of parallel groove structures, which plays a role of collimating light, and has higher light-emitting efficiency than a light-guide plate with a light-emitting surface.
  • FIG. 1 is a schematic view showing a fixed positioning manner of several light guide plates and a back frame of the prior art.
  • a light-emitting surface 2 of the light guide plate 1 is provided with a plurality of parallel grooves 3, wherein (a) is a positioning portion 4 provided at a side end of the light guide plate 1, and the positioning portion 4 of the back frame 5 and the positioning portion 4 Correspondingly, the positioning member 6 is disposed, and the positioning portion 4 and the limiting member 6 cooperate with each other to fix the light guide plate 1 and the back frame 5 relatively; (b) the positioning portion 7 is disposed at the side end of the light guide plate 1. A positioning hole 8 is disposed on the positioning portion 4, and a positioning post 9 is disposed at a position corresponding to the positioning hole 8 of the back frame 5.
  • the positioning post 9 is disposed in the positioning hole 8 to enable the light guide plate 1 and the back The frame 5 is relatively fixed; (c) the positioning hole 11 is directly disposed at the side end of the light guide plate 1, and the positioning post 12 is disposed at a position corresponding to the positioning hole 11 of the back frame 5, and the positioning post 12 is disposed at the positioning hole. 11 is such that the light guide plate 1 and the back frame 5 are relatively fixed. However, in FIG. 1, due to the fixed positioning design between the light guide plate 1 and the back frame 5, the structure of the groove 3 on the light guide plate 1 is broken, and when light propagates to the position of the light guide plate 1, the light is transmitted.
  • an object of the present invention is to provide a light guide plate, a backlight module, and a liquid crystal display device which can effectively prevent light leakage.
  • a light guide plate including a light incident surface for receiving an incident light beam, a light exit surface for guiding the light beam, and a bottom surface opposite to the light exit surface, the light incident surface and the light incident surface
  • the light-emitting surface is disposed, and the light-emitting surface is provided with a plurality of grooves
  • the light-guiding plate further includes: two edge surfaces respectively disposed at two ends of the light-emitting surface, the edge surface intersecting the light-incident surface
  • the length direction of the edge surface is consistent with the extending direction of the groove, and the distance between the edge surface and the bottom surface is smaller than the distance between the light emitting surface and the bottom surface.
  • a distance between the edge surface and the bottom surface and a distance between the light exit surface and the bottom surface satisfy the following formula:
  • T EDGE represents the distance between the edge face and the bottom face
  • TL CP represents the distance between the light exit face and the bottom face.
  • a length direction of the light incident surface is perpendicular to an extending direction of the trench.
  • the edge surface is provided with a plurality of grooves, wherein the grooves may be the same as the grooves provided on the light exit surface.
  • a backlight module includes: a light guide plate including a light incident surface for receiving an incident light beam, a light emitting surface for guiding the light beam, a bottom surface opposite to the light emitting surface, and Separating the two edge faces at the two ends of the light-emitting surface, the light-emitting surface and the edge surface respectively intersecting the light-incident surface, wherein the light-emitting surface is provided with a plurality of grooves, and the length direction of the edge surface Consistent with the extending direction of the groove, a distance between the edge surface and the bottom surface is smaller than the light emitting surface and the The distance between the bottom surfaces; the light source unit is fixedly disposed adjacent to the light incident surface of the light guide plate; and the back frame is configured to carry the light guide plate and the light source unit. Further, a distance between the edge surface and the bottom surface and a distance between the light exit surface and the bottom surface satisfy the following formula: 1 T Edge 2
  • T EDGE represents the distance between the edge face and the bottom face
  • TL CP represents the distance between the light exit face and the bottom face.
  • a length direction of the light incident surface is perpendicular to an extending direction of the trench.
  • the edge surface is provided with a plurality of grooves. Further, the groove provided on the edge surface is the same as the groove provided on the light exit surface.
  • the light source unit is a light bar formed by a power supply main board and a plurality of point light sources carried on the power supply main board. Further, a length direction of the light source unit is perpendicular to an extending direction of the groove.
  • At least one positioning portion is disposed at a side end of the edge surface
  • at least one limiting member is disposed at a position corresponding to the positioning portion on an inner surface of the back frame, the positioning portion and the limiting portion Cooperating with each other to position the light guide plate on the inner surface of the back frame.
  • a liquid crystal display device includes a backlight module and a liquid crystal panel disposed opposite the backlight module, wherein the backlight module provides a display light source to the liquid crystal panel to The liquid crystal panel displays an image
  • the backlight module includes: a light guide plate, including a light incident surface for receiving an incident light beam, a light emitting surface for guiding the light beam, and a bottom surface opposite to the light emitting surface, respectively Illustrating two edge faces at both ends of the smooth surface, the light exiting surface and the edge surface intersecting the light incident surface, the light exiting surface is provided with a plurality of grooves, and the longitudinal direction of the edge surface and the groove The extending direction of the groove is the same, the distance between the edge surface and the bottom surface is smaller than the distance between the light emitting surface and the bottom surface; the light source unit is fixedly disposed adjacent to the light incident surface of the light guide plate; And for carrying the light guide plate and the light source unit. Further, a distance between the edge surface and
  • T EDGE represents the distance between the edge face and the bottom face
  • TL CP represents the distance between the light exit face and the bottom face.
  • a length direction of the light incident surface is perpendicular to an extending direction of the trench.
  • the edge surface is provided with a plurality of grooves. Further, the groove provided on the edge surface is the same as the groove provided on the light exit surface.
  • the light source unit is a light bar formed by a power supply main board and a plurality of point light sources carried on the power supply main board. Further, a length direction of the light source unit is perpendicular to an extending direction of the groove.
  • At least one positioning portion is disposed at a side end of the edge surface
  • at least one limiting member is disposed at a position corresponding to the positioning portion on an inner surface of the back frame, the positioning portion and the limiting portion Cooperating with each other to position the light guide plate on the inner surface of the back frame.
  • FIG. 1 is a schematic view showing a fixed positioning manner of several light guide plates and a back frame of the prior art.
  • FIG. 2 is a schematic structural view showing a liquid crystal display device according to an exemplary embodiment of the present invention.
  • FIG. 3 is a schematic structural view showing a backlight module according to an exemplary embodiment of the present invention.
  • 4 is a plan view showing the light source unit, the light guide plate, and the back frame of FIG. 3.
  • FIG. 5 is a side view showing the light guide plate of Fig. 3.
  • FIG. 6 is a plan view showing a light source unit, a light guide plate, and a back frame of another exemplary embodiment.
  • FIG. 7 is a side view showing a light guide plate of another exemplary embodiment.
  • FIG. 2 is a schematic structural view showing a liquid crystal display device according to an exemplary embodiment of the present invention.
  • a liquid crystal display device 10 according to an exemplary embodiment of the present invention includes a backlight module 20 and a liquid crystal panel 30 disposed opposite to the backlight module 20 , and the backlight module 20 provides a display light source to the liquid crystal panel 30 , so that The liquid crystal panel 30 displays an image or an image.
  • the liquid crystal panel 30 of the exemplary embodiment of the present invention mainly includes a color filter substrate, a thin film transistor array substrate, and a liquid crystal layer interposed between the color filter substrate and the thin film transistor array substrate, wherein the liquid crystal layer It includes several liquid crystal molecules.
  • the color filter substrate disposed opposite to the thin film transistor array substrate is also referred to as a CF (Color Filter) substrate, which generally includes a transparent substrate (such as a glass substrate) and a black matrix pattern, a color photoresist layer disposed on the transparent substrate (such as red (R), green (G) and blue (B) filter patterns) and alignment layers.
  • a thin film transistor array substrate disposed opposite to the color filter substrate is also referred to as a TFT (Thin Film Transistor) substrate, which generally includes a transparent substrate (such as a glass substrate) and a plurality of thin film transistors arranged in an array on the transparent substrate.
  • TFT Thin Film Transistor
  • the main function of the thin film transistor array substrate is to supply a driving voltage to the liquid crystal molecules in the liquid crystal layer, so that the liquid crystal molecules are deflected, so that light can pass through the liquid crystal layer, and then the color filter substrate is matched to the liquid crystal panel.
  • 30 Display images or images.
  • the backlight module 20 of the exemplary embodiment of the present invention will be described in detail.
  • 3 is a schematic structural view showing a backlight module according to an exemplary embodiment of the present invention
  • FIG. 4 is a plan view showing the light source unit, the light guide plate and the back frame in FIG. 3
  • FIG. 5 is a view showing the light source unit, the light guide plate and the back frame in FIG. Side view of the light guide. Referring to FIGS.
  • a backlight module 20 includes a light guide plate 210, a light source unit 220, a back frame 230, a middle frame 240, a reflection sheet 250, and an optical film 260.
  • the light guide plate 210 has a rectangular shape as a whole, but the present invention is not limited thereto.
  • the light guide plate 210 includes a light incident surface 211 for receiving an incident light beam (wherein the light incident surface 211 is a side surface in the width direction of the light guide plate 210), and a light exit surface 212 for guiding the light beam, opposite to the light exit surface 212.
  • the bottom surface 213 and the two edge surfaces 214 respectively disposed on the two sides of the light-emitting surface 212 along the longitudinal direction of the light guide plate 210 (ie, the length direction of each edge surface 214 is consistent with or substantially coincident with the length direction of the light guide plate 210);
  • the light-emitting surface 212 and the two edge surfaces 214 are both connected to the light-incident surface 211.
  • the light-emitting surface 211 is provided with a plurality of V-shaped grooves 211a arranged in parallel, and the extending direction of the V-shaped grooves 211a and the length direction of the light guide plate 210.
  • the distance between each edge surface 214 and the bottom surface 213 is less than the distance between the light exit surface 212 and the bottom surface 213.
  • the extending direction of the V-shaped groove 211a is perpendicular to the longitudinal direction of the light incident surface 211.
  • the groove of the present invention is not limited to the V-shaped groove 211a in the present embodiment, and may be, for example, a groove having a shape of a cross section in the shape of an arc, a semicircle or the like.
  • each edge surface 214 is along the length direction of the light guide plate 210 and the light incident surface 211 is in the width direction of the light guide plate 210.
  • the side views are only an example of the invention and are not intended to limit the invention.
  • the light incident surface 211 may be a side surface in the longitudinal direction of the light guide plate 210, and each edge surface 214 may be along the width direction of the light guide plate 210.
  • the extending direction of the 211a may coincide with or substantially coincide with the width direction of the light guide plate 210.
  • the light source unit 220 may be carried by a plurality of point light sources 222 (for example, inorganic light emitting diodes, organic light emitting diodes, or a combination of the above diodes) on a power supply main board having a certain length (for example, a printed circuit board (Printed Circuit Board).
  • a light bar formed on the 221 is electrically connected to the power supply main board 221.
  • the light source unit 220 is also a fluorescent light source (for example, a cold cathode fluorescent tube,
  • the back frame 230 includes a back plate 231 and two side walls 232 respectively connected to the two ends of the back plate 231. The two side walls 232 are oppositely disposed.
  • the two side walls 232 and back of the back frame 230 The plate 231 is formed to form an accommodating space 233.
  • the light guide plate 210 is disposed in the accommodating space 233 such that the bottom surface 213 of the light guide plate 210 is placed on the inner surface 231a of the back plate 231. To prevent the light guide plate 210 from being on the back plate 231 A large displacement occurs on the inner surface 231a, and the light guide plate 210 needs to be fixedly positioned.
  • each edge surface 214 are provided with two positioning portions 214a, and the inner surface 231a of the back plate 231 is
  • the positioning portion 214a is provided with a limiting member 231b, and each positioning portion 214a and its corresponding limiting member 231b cooperate with each other to fix the light guide plate 210 on the inner surface 231a of the backing plate 231.
  • the fixed positioning manner of the light guide plate 210 and the back frame 230 is only an example, and is not intended to limit the present invention. Other positioning methods, such as the fixed positioning method shown in (b) or (c) of Figure 1.
  • the light source unit 230 is disposed on one of the two side walls 232 of the back frame 230, and is disposed adjacent to the light incident surface 211 of the light guide plate 210, that is, the length direction of the light source unit 230 is perpendicular or substantially perpendicular to the extending direction of the groove 211a.
  • the present invention is not limited thereto.
  • the two light source units 230 may be respectively disposed on the two side walls 232 of the back frame 230, that is, the longitudinal directions of the two light source units 230 are perpendicular to the extending direction of the groove 211a. Or roughly vertical.
  • each edge surface 214 is along the width direction of the light guide plate 210. (that is, the length direction of each edge surface 214 is the same or substantially the same as the width direction of the light guide plate 210), and the length direction and the groove of the light source unit 230 when the extending direction of the groove 211a coincides with or substantially coincides with the width direction of the light guide plate 210.
  • the extending direction of the groove 211a is perpendicular or substantially perpendicular, that is, the longitudinal direction of the light source unit 230 coincides with or substantially coincides with the longitudinal direction of the light guide plate 210.
  • the material used for the middle frame 240 is plastic, which can be integrally formed by a mold, and is disposed above the light-emitting surface 212 of the light guide plate 210 and fixedly coupled with the two side walls 232 of the back frame 230. Further, the light guide plate 210 and the light source unit 230 provided in the accommodation space 233 are fixed.
  • the reflective sheet 250 is disposed between the bottom surface 213 of the light guide plate 210 and the inner surface 231a of the back plate 231 of the back frame 230 for reflecting light emitted from the bottom surface 213 of the light guide plate 210 back into the light guide plate 210 to enhance light.
  • the utilization efficiency wherein the reflective sheet 250 may be a single layer or a multilayer structure, and the material thereof may include a white material, a reflective material, or other suitable material.
  • the optical film 260 is disposed between the light-emitting surface 212 of the light guide plate 210 and the middle frame 240 to improve the brightness, color saturation, color uniformity, and the like of the light emitted from the light-emitting surface 212 of the light guide plate 210 to enhance the liquid crystal panel.
  • the optical film 260 includes a brightness enhancement film (BEF), a uniform light film, a strong brightness enhancement film (DBEF), a polarizing film, or a combination thereof.
  • some special optical films can have at least two optical functions at the same time, so they can only be called composite optical films, for example: polarized/brightening function, diffusion/brightening function, homogenizing/strong brightness enhancement , polarized / diffused / brightening function.
  • the optical architecture of this part is not substantially different from the prior art and will not be described here.
  • the distance between the edge surface 214 and the bottom surface 213 and the distance between the light exit surface 212 and the bottom surface 213 satisfy the following conditions.
  • 1 ⁇ indicates the distance between the edge surface 214 and the bottom surface 213
  • TL CP indicates the glossy surface.
  • the distance between the surface 212 and the bottom surface 213 defines the ratio between the distance between the edge surface 214 and the bottom surface 213 and the distance between the light exit surface 212 and the bottom surface 213.
  • the ratio exceeds the lower limit, it is advantageous to block the scattered light by using the area where the light-emitting surface 212 is located. Or, it is advantageous for the light scattered by the edge surface 214 or the region where it is located to enter the region where the light exit surface 212 is located again, to avoid light leakage, but the distance between the edge surface 214 and the bottom surface 213 is too short.
  • each of the edge faces 214 is not provided with a plurality of grooves arranged in parallel, but the invention is not limited thereto.
  • each edge surface 214 may also be provided with a plurality of parallel-arranged trenches 214b, which are the same as the above-described V-shaped trenches 211a,
  • the cross-sectional shape is V-shaped.
  • the groove on each of the edge faces 214 may also be a groove having a shape of a cross section such as an arc shape, a semicircle shape or the like.
  • the present invention by thinning the edge thickness of the light guide plate, the height difference between the light exit surface and the edge surface of the light guide plate is effectively prevented from leaking light at the fixed position of the light guide plate, and the lift is improved.
  • the display quality of the liquid crystal display device is improved.

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

Abstract

一种导光板及具有该导光板的背光模组及液晶显示装置。导光板(210)包括用于接收入射光束的入光面(211)、用于将光束导出的出光面(212)、与该出光面(212)相对的底面(213)及分别设置在出光面(212)两侧端的两个边缘面(214)。出光面(212)和边缘面(214)均与入光面(211)相交。出光面(212)设置多个沟槽(211a),边缘面(214)的长度方向与沟槽(211a)的延伸方向一致。边缘面(214)与底面(213)之间的距离小于出光面(212)与底面(213)之间的距离。通过将导光板的边缘厚度减薄,以出光面与边缘面之间的高度差来有效防止导光板的固定定位处漏光。

Description

导光板、 背光模组及液晶显示装置 技术领域
本发明涉及液晶显示领域; 更具体地讲, 涉及一种能够有效防止漏光的导 光板、 背光模组及液晶显示装置。 背景技术 液晶显示装置由于具有轻薄、 耗电少、 辐射低等优点而被广泛应用, 其已 成为市面上显示器的主流。 无论是笔记本电脑、 移动电话乃至于家用电视等, 液晶显示装置已完全走入人类的生活之中。而由于液晶分子本身无法发光的特 性, 因此液晶显示装置处理液晶面板之外, 尚需仰赖背光模组提供显示光源, 方能达到显示的作用。 随着液晶显示领域技术的发展以及近年来节能环保意识的抬头, 背光模组 已由之前的直下式背光模组发展到侧入式背光模组。而随着侧入式背光模组的 发展, 微结构导光板被广泛的应用。 所述微结构导光板指的是导光板出光面含 有多个平行的沟槽结构, 其对光线起到准直的作用, 相比出光面为平面的导光 板出光效率更高。 在液晶显示装置中, 尤其是大尺寸的液晶显示装置中, 为了防止导光板相 对背框发生大的位移, 需将导光板与背框相对固定。 图 1是示出现有技术的几 种导光板与背框的固定定位方式的示意图。 在图 1中, 导光板 1的出光面 2设 置多个平行的沟槽 3, 其中, (a) 图是在导光板 1的侧端设置定位部 4, 在背 框 5的与该定位部 4对应的位置设置限位件 6, 该定位部 4与该限位件 6相互 配合, 以使导光板 1与背框 5相对固定; (b) 图是在导光板 1的侧端设置定位 部 7, 且在该定位部 4上设置定位孔 8, 在背框 5的与该定位孔 8对应的位置 设置定位柱 9, 该定位柱 9设置在该定位孔 8中, 以使导光板 1与背框 5相对 固定; (c)图是直接在导光板 1的侧端设置定位孔 11, 在背框 5的与该定位孔 11对应的位置设置定位柱 12, 该定位柱 12设置在该定位孔 11中, 以使导光 板 1与背框 5相对固定。 然而, 在图 1中, 由于导光板 1与背框 5之间的固定定位设计, 破坏了导 光板 1上的沟槽 3的结构, 当光线传播至导光板 1的定位处时, 光线的传播角 度将被大幅度地改变 (例如某些光线的传播方向与沟槽 3 的延伸方向垂直), 甚至发生散射, 再经沟槽 3的作用而导出, 造成背光模组在导光板 1的定位处 出现漏光现象, 进而影响液晶显示装置的显示品质。 发明内容 为了解决上述现有技术存在的问题, 本发明的目的在于提供一种能够有效 防止漏光的一种导光板、 背光模组及液晶显示装置。 根据本发明的一方面, 提供了一种导光板, 其包括用于接收入射光束的入 光面、 用于将光束导出的出光面及与该出光面相对的底面, 所述入光面与所述 出光面相交, 所述出光面设置多个沟槽, 其中, 所述导光板还包括: 分别设置 在所述出光面两侧端的两个边缘面, 所述边缘面与所述入光面相交, 所述边缘 面的长度方向与所述沟槽的延伸方向一致, 所述边缘面与所述底面之间的距离 小于所述出光面与所述底面之间的距离。 进一步地, 所述边缘面与所述底面之间的距离和所述出光面与所述底面之 间的距离满足下面的式子:
1 z TEdge , 2 其中, TEDGE表示所述边缘面与所述底面之间的距离, TLCP表示所述出光面 与所述底面之间的距离。 进一步地, 所述入光面的长度方向垂直于所述沟槽的延伸方向。 进一步地, 所述边缘面设置多个沟槽, 其中, 该沟槽可与所述出光面设置 的沟槽相同。 根据本发明的另一方面, 提供了一种背光模组, 其包括: 导光板, 包括用 于接收入射光束的入光面、 用于将光束导出的出光面、 与该出光面相对的底面 及分别设置在所述出光面两侧端的两个边缘面, 所述出光面和所述边缘面均与 所述入光面相交, 所述出光面设置多个沟槽, 所述边缘面的长度方向与所述沟 槽的延伸方向一致, 所述边缘面与所述底面之间的距离小于所述出光面与所述 底面之间的距离; 光源单元, 邻近于所述导光板的入光面固定设置; 背框, 用 于承载所述导光板及所述光源单元。 进一步地, 所述边缘面与所述底面之间的距离和所述出光面与所述底面之 间的距离满足下面的式子: 1 TEdge 2
3 _ T ALGP _ 3, 其中, TEDGE表示所述边缘面与所述底面之间的距离, TLCP表示所述出光面 与所述底面之间的距离。 进一步地, 所述入光面的长度方向垂直于所述沟槽的延伸方向。 进一步地, 所述边缘面设置多个沟槽。 进一步地, 所述边缘面设置的所述沟槽与所述出光面设置的所述沟槽相 同。 进一步地, 所述光源单元是由供电主板及承载在该供电主板之上的若干点 光源形成的灯条。 进一步地, 所述光源单元的长度方向垂直于所述沟槽的延伸方向。 进一步地, 所述边缘面的侧端设置至少一定位部, 所述背框的内表面上与 所述定位部对应的位置设有至少一限位件, 所述定位部与所述限位件相互配 合, 以使所述导光板定位于所述背框的内表面上。 根据本发明的又一方面, 提供了一种液晶显示装置, 其包括背光模组及与 该背光模组相对设置的液晶面板, 所述背光模组提供显示光源给所述液晶面 板, 以使所述液晶面板显示影像, 其中, 所述背光模组包括: 导光板, 包括用 于接收入射光束的入光面、 用于将光束导出的出光面、 与该出光面相对的底面 及分别设置在所述出光面两侧端的两个边缘面, 所述出光面和所述边缘面均与 所述入光面相交, 所述出光面设置多个沟槽, 所述边缘面的长度方向与所述沟 槽的延伸方向一致, 所述边缘面与所述底面之间的距离小于所述出光面与所述 底面之间的距离; 光源单元, 邻近于所述导光板的入光面固定设置; 背框, 用 于承载所述导光板及所述光源单元。 进一步地, 所述边缘面与所述底面之间的距离和所述出光面与所述底面之 间的距离满足下面的式子:
1 TEdge < 2
3 _ T ALGP _ 3, 其中, TEDGE表示所述边缘面与所述底面之间的距离, TLCP表示所述出光面 与所述底面之间的距离。 进一步地, 所述入光面的长度方向垂直于所述沟槽的延伸方向。 进一步地, 所述边缘面设置多个沟槽。 进一步地, 所述边缘面设置的所述沟槽与所述出光面设置的所述沟槽相 同。 进一步地, 所述光源单元是由供电主板及承载在该供电主板之上的若干点 光源形成的灯条。 进一步地, 所述光源单元的长度方向垂直于所述沟槽的延伸方向。 进一步地, 所述边缘面的侧端设置至少一定位部, 所述背框的内表面上与 所述定位部对应的位置设有至少一限位件, 所述定位部与所述限位件相互配 合, 以使所述导光板定位于所述背框的内表面上。
本发明通过将导光板的边缘厚度减薄, 以导光板的出光面与边缘面之间的 高度差来有效防止导光板的固定定位处漏光, 提升液晶显示装置的显示品质。 附图说明 图 1是示出现有技术的几种导光板与背框的固定定位方式的示意图。 图 2是示出根据本发明的示例性实施例的液晶显示装置的结构示意图。 图 3是示出根据本发明的示例性实施例的背光模组的结构示意图。 图 4是示出图 3中的光源单元、 导光板及背框的俯视图。 图 5是示出图 3中的导光板的侧视图。 图 6是示出另一示例性实施例的光源单元、 导光板及背框的俯视图。 图 7是示出另一示例性实施例的导光板的侧视图。 具体实施方式 以下, 将参照附图更充分地描述本发明的示例性实施例, 其示例在附图中 示出。 然而, 可以以许多不同的形式实施示例性实施例, 并且本发明不应被解 释为局限于在此阐述的示例性实施例。 相反, 提供这些实施例从而本公开将会 彻底和完整, 并可完全地将示例性实施例的范围传达给本领域的技术人员。 在 附图中, 相同的标号始终表示相同的部件。 图 2是示出根据本发明的示例性实施例的液晶显示装置的结构示意图。 参照图 2, 根据本发明的示例性实施例的液晶显示装置 10包括背光模组 20及与该背光模组 20相对设置的液晶面板 30, 背光模组 20提供显示光源给 液晶面板 30, 以使液晶面板 30显示影像或图像。 鉴于本发明的示例性实施例的液晶面板 30的构造与现有的液晶面板的构 造相同, 因而在此只作简要概述。 本发明的示例性实施例的液晶面板 30主要 包括彩色滤光片基板、薄膜晶体管阵列基板以及夹设在该彩色滤光片基板和该 薄膜晶体管阵列基板之间的液晶层, 其中, 该液晶层中包括若干液晶分子。 与 该薄膜晶体管阵列基板相对设置的该彩色滤光片基板也称 CF ( Color Filter)基 板, 其通常包括透明基板(诸如玻璃基板) 以及设置在透明基板上的黑色矩阵 图案、 彩色光阻层 (诸如红 (R)、 绿 (G) 和蓝 (B ) 滤光片图案) 以及配向 层等。 与该彩色滤光片基板相对设置的薄膜晶体管阵列基板也称 TFT ( Thin Film Transistor)基板, 其通常包括透明基板(诸如玻璃基板) 以及阵列排布在 透明基板上的若干薄膜晶体管等。该薄膜晶体管阵列基板主要作用是向该液晶 层中的该液晶分子提供驱动电压, 以使该液晶分子进行偏转, 从而使光线可穿 过该液晶层, 进而配合该彩色滤光片基板使液晶面板 30显示影像或图像。 以下, 将对本发明的示例性实施例的背光模组 20进行详细地描述。 图 3是示出根据本发明的示例性实施例的背光模组的结构示意图, 图 4是 示出图 3中的光源单元、 导光板及背框的俯视图, 图 5是示出图 3中的导光板 的侧视图。 参照图 3至图 5, 根据本发明的示例性实施例的背光模组 20包括导光板 210、 光源单元 220、 背框 230、 中框 240、 反射片 250和光学膜片 260。 在本实施例中, 导光板 210整体呈长方形状, 但本发明并不局限于此。 导 光板 210包括用于接收入射光束的入光面 211 (其中, 该入光面 211为导光板 210的宽度方向上的侧面)、 用于将光束导出的出光面 212、 与该出光面 212相 对的底面 213及分别设置在出光面 212的沿导光板 210的长度方向的两侧端的 两个边缘面 214 (即每个边缘面 214的长度方向与导光板 210的长度方向一致 或基本一致); 其中, 出光面 212和两个边缘面 214均与入光面 211相连, 出 光面 211设置多个平行排列的 V形沟槽 211a, 该 V形沟槽 211a的延伸方向与 导光板 210的长度方向一致或基本一致, 每个边缘面 214与底面 213之间的距 离小于出光面 212与底面 213之间的距离。 此外, 该 V形沟槽 211a的延伸方 向与入光面 211的长度方向垂直。本发明的沟槽并不局限于本实施例中的 V形 沟槽 211a, 其也可例如是截面形状为弧形、 半圆形等形状的沟槽。 此外, 图 4 所示的沟槽 211a的延伸方向与导光板 210的长度方向一致或基本一致、 每个 边缘面 214沿导光板 210的长度方向以及入光面 211为导光板 210的宽度方向 上的侧面只是作为本发明的一示例,并不用于限制本发明。例如,如图 6所示, 在本发明的另一实施例中, 入光面 211可为导光板 210的长度方向上的侧面, 每个边缘面 214可沿导光板 210的宽度方向, 沟槽 211a的延伸方向可与导光 板 210的宽度方向一致或基本一致。 在本实施例中, 光源单元 220可是由若干点光源 222 (例如: 无机发光二 极管、 有机发光二极管、 或上述二极管的组合)承载在具有一定长度的供电主 板(例如印刷电路板( Printed Circuit board, PCB ) 221上形成的灯条( Light Bar), 并且若干点光源 222与供电主板 221电连接。 本发明并不局限于此, 所述光源 单元 220也可是荧光光源 (例如: 冷阴极荧光灯管、 热阴极荧光灯管等)。 背框 230包括背板 231及分别与该背板 231两侧端相连接的两侧壁 232, 该两侧壁 232相对设置。背框 230的两侧壁 232与背板 231合围形成一容置空 间 233。 导光板 210设置在该容置空间 233中, 以使导光板 210的底面 213放 置在背板 231的内表面 231a上。为了防止导光板 210在背板 231的内表面 231a 上发生大的移位, 需将导光板 210固定定位, 为此, 每个边缘面 214的侧端设 置两个定位部 214a,背板 231的内表面 231a上与每个定位部 214a对应的位置 设有限位件 231b,每个定位部 214a与其对应的限位件 231b相互配合, 以使导 光板 210固定定位于背板 231的内表面 231a上。 图 4所示的导光板 210与背 框 230的固定定位方式只作为一种示例, 并不用于限制本发明, 本发明可采用 其它定位方式, 例如图 1中的 (b ) 图或 (c) 图所示的固定定位方式。 光源单 元 230设置在背框 230的两侧壁 232其中之一上, 以邻近于导光板 210的入光 面 211固定设置, 即光源单元 230的长度方向与沟槽 211a的延伸方向垂直或 大致垂直, 但本发明并不局限于此, 例如也可利用两个光源单元 230分别设置 在背框 230的两侧壁 232上, 即两个光源单元 230的长度方向均与沟槽 211a 的延伸方向垂直或大致垂直。 此外, 诚如上述, 如图 6所示, 在本发明的另一 实施例中, 当入光面 211为导光板 210的长度方向上的侧面, 每个边缘面 214 沿导光板 210的宽度方向(即每个边缘面 214的长度方向与导光板 210的宽度 方向一致或基本一致), 沟槽 211a的延伸方向与导光板 210的宽度方向一致或 基本一致时, 光源单元 230的长度方向与沟槽 211a的延伸方向垂直或大致垂 直, 即光源单元 230的长度方向与导光板 210的长度方向一致或基本一致。 此外, 根据本发明的示例性实施例, 中框 240所用材料为塑料, 其可由模 具一体成型, 且其设置在导光板 210的出光面 212之上并与背框 230的两侧壁 232固定结合, 进而将设置在容置空间 233内的导光板 210、 光源单元 230固 定。反射片 250设置在导光板 210的底面 213与背框 230的背板 231的内表面 231a之间, 用于将从导光板 210的底面 213射出的光线反射回导光板 210中, 以提升光线的利用效率, 其中, 反射片 250可为单层或多层结构, 且其材料可 包含白色材料、 反射材料或其它合适的材料。 光学膜片 260设置在导光板 210 的出光面 212与中框 240之间, 用以改善从导光板 210的出光面 212射出的光 的亮度、 色饱和度、 色均匀度等, 以提升液晶面板的显示效果, 其中, 光学膜 片 260包含增亮膜 (BEF)、 均光膜、 强效增亮膜 (DBEF)、 偏光膜或上述的 组合。 另外, 一些特殊的光学膜可同时具有至少两种光学功能, 则仅能称为复 合式光学膜, 例如: 同时具有偏光 /增亮功能、 扩散 /增亮功能、 均光 /强效增亮 功能、 偏光 /扩散 /增亮功能等。 这部分的光学架构与现有技术并无实质差异, 在此不再赘述。 根据本发明的示例性实施例, 优选的, 所述边缘面 214与底面 213之间的 距离和出光面 212与底面 213之间的距离满足下面的条件。
Figure imgf000009_0001
这里, 1^^表示所述边缘面 214与底面 213之间的距离, TLCP表示出光面 212与底面 213之间的距离 上述的条件 1限定了所述边缘面 214与底面 213之间的距离和出光面 212 与底面 213之间的距离之间的比率。当光线传播至所述边缘面 214所在的区域 时, 光线的传播角度会大幅度的改变, 甚至发生散射, 当该比率超过下限时, 有利于利用出光面 212所在的区域将散射出的光线遮挡, 或者说有利于由所述 边缘面 214或其所在的区域散射出的光线再次进入到出光面 212所在的区域, 避免造成漏光, 但是由于所述边缘面 214与底面 213之间的距离过短, 将会使 得所述边缘面 214与出光面 212之间极易出现裂缝,进而导致导光板 210损坏。 当该比率超过上限时, 所述边缘面 214与出光面 212之间稳固, 提高了导光板 210的可靠性, 但是难以利用出光面 212所在的区域将散射出的光线遮挡, 或 者说难以使由所述边缘面 214或其所在的区域散射出的光线再次进入到出光面 212所在的区域, 进而造成漏光现象发生。 可选的, 在本发明的实施例中, 每个边缘面 214不设置多个平行排列的沟 槽, 但本发明并不局限于此。 例如, 如图 7所示, 在本发明的另一实施例中, 每个边缘面 214也可设置多个平行排列的沟槽 214b, 该沟槽 214b与上述的 V 形沟槽 211a相同, 其截面形状为 V形。 当然, 应当理解, 在本发明中, 每个 边缘面 214上的沟槽也可是截面形状为弧形、 半圆形等形状的沟槽。 综上所述, 根据本发明的示例性实施例, 通过将导光板的边缘厚度减薄, 以导光板的出光面与边缘面之间的高度差来有效防止导光板的固定定位处漏 光, 提升液晶显示装置的显示品质。 尽管已经参照其示例性实施例具体显示和描述了本发明, 但是本领域的技 术人员应该理解, 在不脱离权利要求所限定的本发明的精神和范围的情况下, 可以对其进行形式和细节上的各种改变。

Claims

权利要求书
1、 一种导光板, 包括用于接收入射光束的入光面、 用于将光束导出的出 光面及与该出光面相对的底面, 所述入光面与所述出光面相交, 所述出光面设 置多个沟槽, 其中, 所述导光板还包括: 分别设置在所述出光面两侧端的两个 边缘面, 所述边缘面与所述入光面相交, 所述边缘面的长度方向与所述沟槽的 延伸方向一致, 所述边缘面与所述底面之间的距离小于所述出光面与所述底面 之间的距离。
2、 根据权利要求 1所述的导光板, 其中, 所述边缘面与所述底面之间的 距离和所述出光面与所述底面之间的距离满足下面的式子:
1 z TEdge , 2 其中, TEdge表示所述边缘面与所述底面之间的距离,
与所述底面之间的距离。
3、 根据权利要求 1所述的导光板, 其中, 所述入光面的长度方向垂直于 所述沟槽的延伸方向。
4、 根据权利要求 1所述的导光板, 其中, 所述边缘面设置多个沟槽。
5、 根据权利要求 4所述的导光板, 其中, 所述边缘面设置的所述沟槽与 所述出光面设置的所述沟槽相同。
6、 一种背光模组, 其中, 包括: 导光板, 包括用于接收入射光束的入光面、 用于将光束导出的出光面、 与 该出光面相对的底面及分别设置在所述出光面两侧端的两个边缘面, 所述出光 面和所述边缘面均与所述入光面相交, 所述出光面设置多个沟槽, 所述边缘面 的长度方向与所述沟槽的延伸方向一致, 所述边缘面与所述底面之间的距离小 于所述出光面与所述底面之间的距离; 光源单元, 邻近于所述导光板的入光面固定设置; 背框, 用于承载所述导光板及所述光源单元。
7、 根据权利要求 6所述的背光模组, 其中, 所述边缘面与所述底面之间 的距离和所述出光面与所述底面之间的距离满足下面的式子:
1 ^ TEdge 2 其中, TEDGE表示所述边缘面与所述底面之间的距离, TLCP表示所述出光面 与所述底面之间的距离。
8、 根据权利要求 6所述的背光模组, 其中, 所述入光面的长度方向垂直 于所述沟槽的延伸方向。
9、 根据权利要求 6所述的背光模组, 其中, 所述边缘面设置多个沟槽。
10、 根据权利要求 9所述的背光模组, 其中, 所述边缘面设置的所述沟槽 与所述出光面设置的所述沟槽相同。
11、 根据权利要求 6所述的背光模组, 其中, 所述光源单元是由供电主板 及承载在该供电主板之上的若干点光源形成的灯条。
12、 根据权利要求 11 所述的背光模组, 其中, 所述光源单元的长度方向 垂直于所述沟槽的延伸方向。
13、 根据权利要求 6所述的背光模组, 其中, 所述边缘面的侧端设置至少 一定位部, 所述背框的内表面上与所述定位部对应的位置设有至少一限位件, 所述定位部与所述限位件相互配合, 以使所述导光板定位于所述背框的内表面 上。
14、 一种液晶显示装置, 包括背光模组及与该背光模组相对设置的液晶面 板,所述背光模组提供显示光源给所述液晶面板,以使所述液晶面板显示影像, 其中, 所述背光模组包括: 导光板, 包括用于接收入射光束的入光面、 用于将光束导出的出光面、 与 该出光面相对的底面及分别设置在所述出光面两侧端的两个边缘面, 所述出光 面和所述边缘面均与所述入光面相交, 所述出光面设置多个沟槽, 所述边缘面 的长度方向与所述沟槽的延伸方向一致, 所述边缘面与所述底面之间的距离小 于所述出光面与所述底面之间的距离; 光源单元, 邻近于所述导光板的入光面固定设置; 背框, 用于承载所述导光板及所述光源单元
15、 根据权利要求 14所述的液晶显示装置, 其中, 所述边缘面与所述底 面之间的距离和所述出光面与所述底面之间的距离满足下面的式子:
1 z TEdge , 2 其中, TEDGE表示所述边缘面与所述底面之间的距离, TLCP表示所述出光面 与所述底面之间的距离。
16、 根据权利要求 14所述的液晶显示装置, 其中, 所述入光面的长度方 向垂直于所述沟槽的延伸方向。
17、 根据权利要求 14所述的液晶显示装置, 其中, 所述边缘面设置多个 沟槽。
18、 根据权利要求 17所述的液晶显示装置, 其中, 所述边缘面设置的所 述沟槽与所述出光面设置的所述沟槽相同。
19、 根据权利要求 14所述的液晶显示装置, 其中, 所述光源单元的长度 方向垂直于所述沟槽的延伸方向。
20、 根据权利要求 14所述的液晶显示装置, 其中, 所述边缘面的侧端设 置至少一定位部, 所述背框的内表面上与所述定位部对应的位置设有至少一限 位件, 所述定位部与所述限位件相互配合, 以使所述导光板定位于所述背框的 内表面上。
PCT/CN2013/090346 2013-12-20 2013-12-24 导光板、背光模组及液晶显示装置 Ceased WO2015089858A1 (zh)

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