WO2014040344A1 - 直下式背光模组 - Google Patents

直下式背光模组 Download PDF

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Publication number
WO2014040344A1
WO2014040344A1 PCT/CN2012/085774 CN2012085774W WO2014040344A1 WO 2014040344 A1 WO2014040344 A1 WO 2014040344A1 CN 2012085774 W CN2012085774 W CN 2012085774W WO 2014040344 A1 WO2014040344 A1 WO 2014040344A1
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WO
WIPO (PCT)
Prior art keywords
plate
backlight module
direct
light guide
bottom plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/085774
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English (en)
French (fr)
Inventor
王烨文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/807,295 priority Critical patent/US9405149B2/en
Publication of WO2014040344A1 publication Critical patent/WO2014040344A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0025—Diffusing sheet or layer; Prismatic 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to a direct type backlight module. Background technique
  • Liquid crystal display has many advantages such as thin body, power saving, and no radiation, and has been widely used.
  • Most of the liquid crystal display devices on the market are backlight type liquid crystal display devices, which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates, and the liquid crystal molecules are controlled to change direction by energization or not, and the light of the backlight module is refracted. Come out to produce the picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module needs to be used to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the light source.
  • the side-lit backlight module has a backlight LED strip (Light bar) disposed on the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip is from the light-emitting surface of the light guide plate (LGP, Light Guide Plate).
  • the light guide plate enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and then is supplied to the liquid crystal panel through the optical film group to form a surface light source.
  • the liquid crystal display device using the direct-lit backlight module has high image quality (high contrast, adjustable local light source, scanable backlight), high energy-saving effect, and the like.
  • the backlight module of the display device is gradually developed into a direct type backlight module from the initial side-entry backlight module.
  • the conventional direct type backlight module is such that a light source such as a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode) is disposed behind the liquid crystal panel to directly form a surface light source for the liquid crystal panel, CCFL Compared with LEDs, it has the disadvantages of high power consumption, high heat generation, short life, etc.
  • CCFL is gradually replaced by LEDs, but the thickness of the backlight module with LED as the light source is larger than the thickness of the backlight module with CCFL as the light source. More than this is not conducive to the thinning of the liquid crystal display device. Summary of the invention
  • the present invention provides a direct type backlight module, including: a backboard, a card A plurality of LED strips on the backplane, a plurality of light guides spaced apart from the LED strips, and a diffuser disposed on the backplane.
  • the backboard includes a bottom plate and a side plate connected to the bottom plate.
  • the LED light bar is disposed on the bottom plate at intervals from the light guide plate.
  • Each of the light guide plates is provided with two limiting plates on both sides thereof for limiting the light guide plate to the bottom plate.
  • the limiting plate includes a supporting portion vertically connected to the bottom plate at one end and a engaging portion parallel to the bottom plate extending from the supporting portion.
  • the limiting plate is made of a light transmissive material.
  • the LED light bar comprises a PCB board and a plurality of LED lights mounted and electrically connected to the PCB board.
  • the diffuser plate is an integrally formed plate-like structure.
  • the diffusion plate includes a plurality of plates, and the plurality of plates are spaced apart from the light guide plate and located above the light guide plate.
  • the plate is fixedly connected to an end of the support portion of the limiting plate away from the bottom plate.
  • the invention also provides a direct type backlight module, comprising: a backboard and a plurality of strips stuck on the backboard
  • LED strip and the light guide plate are spaced apart from each other on the bottom plate;
  • each of the light guide plates is provided with two limiting plates on both sides thereof for limiting the light guide plate to the bottom plate;
  • the limiting plate includes a supporting portion vertically connected to the bottom plate at one end and a engaging portion extending parallel to the bottom plate extending from the supporting portion;
  • the limiting plate is made of a light transmissive material
  • the LED light bar comprises a PCB board and a plurality of LED lights mounted and electrically connected to the PCB board;
  • the diffusion plate is an integrally formed plate-like structure.
  • the direct-lit backlight module provided by the present invention improves the utilization of light energy of the LED light bar by providing a light guide plate between the LED light bars, thereby reducing the number of LED lights on the LED light bar.
  • the use of the light guide plate can effectively shorten the light mixing distance, and the thickness of the backlight module is reduced while the uniformity of illumination is enhanced, thereby facilitating the thinning of the liquid crystal display device.
  • FIG. 1 is a schematic structural view of an embodiment of a direct type backlight module according to the present invention.
  • FIG. 2 is a schematic view showing the distribution of the LED light bar and the light guide plate of the direct type backlight module of FIG. 1;
  • FIG. 3 is a schematic structural view of another embodiment of the direct type backlight module of the present invention. detailed description
  • the present invention provides a direct type backlight module, including: a back board 2, a plurality of LED strips 4 disposed on the back board 2, and a plurality of strips spaced apart from the LED strips 4
  • the light plate 6 and the diffusion plate 8 provided on the back plate. Due to the arrangement of the light guide plate 6, the light mixing distance of the light emitted by the LED light bar 4 is prolonged, thereby enhancing the light mixing effect, improving the illumination uniformity, and improving the utilization of the light emitted by the LED light bar. Effectively reduce costs.
  • the backboard 2 includes a bottom plate 22 and side plates 24 connected to the bottom plate 22.
  • the LED strip 4 is disposed on the bottom plate 22 at a distance from the light guide plate 6.
  • Two limiting plates 62 are disposed on each side of each of the light guide plates 6 for limiting the light guide plate 6 to the bottom plate 22.
  • the limiting plate 62 includes a supporting portion 622 that is vertically mounted to the bottom plate 22 at one end, and an engaging portion 624 that extends from the supporting portion 622 and is parallel to the bottom plate 22.
  • the limiting plate 62 is made of a light transmissive material, preferably a high light transmissive material, so that the light emitted by the LED light bar 4 can enter the light guide plate 6 more, thereby improving the utilization of the light of the LED light bar 4. Rate, reduce power consumption, and thus reduce costs.
  • the LED light bar 4 includes a PCB board 42 and a plurality of LED lights 44 mounted and electrically connected to the PCB board 42.
  • the light emitted by the LED lamp 44 directly enters the diffusing plate 8 and partially enters the light guide plate 6 through the limiting plate 62.
  • the light guide plate 6 is refracted and reflected and then enters the diffusing plate, thereby improving the utilization of light energy.
  • the number of LED lights on the LED light bar 4 of the direct type backlight module of the present invention can be appropriately reduced, thereby reducing the production cost.
  • the diffusion plate 8 is an integrally formed plate-like structure, which is carried on the side plate 24 of the back plate 2, and the support portion 622 of the limiting plate 62 is away from the end of the bottom plate 22 It is used to support the diffusion plate 8 to strengthen the support of the diffusion plate 8.
  • the thickness of the direct type backlight module of the present invention is generally 0.3 times or more, such as 0.5 times, between the two LED light bars, which can be greatly reduced. The thickness of the thin direct type backlight module provides a prerequisite for the thinning of the liquid crystal display device.
  • the diffusion plate 8 includes a plurality of blocks 82, and the plurality of plates 82 are spaced apart from the light guide plate 6. It is disposed above the light guide plate 6.
  • the number of the blocks 82 is two more than the number of the LED strips 4.
  • the two blocks on the two sides of the back plate 2 are respectively carried on the side plate 24 and the limit.
  • the rest of the plate 62 is carried on the two limiting plates 62.
  • the plate 82 is fixedly connected to one end of the supporting portion 622 of the limiting plate 62 away from the bottom plate 22.
  • the direct-lit backlight module improves the utilization of light energy of the LED light bar by providing a light guide plate between the LED light bars, thereby reducing the number of LED lights on the LED light bar.
  • the production cost is reduced.
  • the use of the light guide plate can effectively shorten the light mixing distance, and the brightness uniformity is enhanced, and the thickness of the backlight module is thinned, thereby facilitating the thinning of the liquid crystal display device.

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

Description

直下式背光模组 技术领域
本发明涉及液晶显示领域， 尤其涉及一种直下式背光模组。 背景技术
液晶显示装置 （LCD , Liquid Crystal Display )具有机身薄、 省电、 无 辐射等众多优点， 得到了广泛的应用。 现有市场上的液晶显示装置大部分 为背光型液晶显示装置， 其包括液晶面板及背光模组 （ backlight module ) 。 液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分 子， 两片玻璃基板中间有许多垂直和水平的细小电线， 通过通电与否来控 制液晶分子改变方向， 将背光模组的光线折射出来产生画面。 由于液晶面 板本身不发光， 需要借由背光模组提供的光源来正常显示影像， 因此， 背 光模组成为液晶显示装置的关键组件之一。 背光模组依照光源入射位置的 不同分成侧入式背光模组与直下式背光模组两种。 侧入式背光模组是将背 光源 LED灯条（ Light bar )设于液晶面板侧后方的背板边缘， LED灯条发 出的光线从导光板 ( LGP , Light Guide Plate )一侧的入光面进入导光板， 经反射和扩散后从导光板出光面射出， 再经由光学膜片组以形成面光源提 供给液晶面板。
与用侧入式背光模组的液晶显示装置相比， 用直下式背光模组的液晶 显示装置具有高画质 （高对比度， 局部光源可调， 可扫描背光） ， 高节能 效果等优点， 液晶显示装置的背光模组由起初的侧入式背光模组逐步发展 成直下式背光模组。 现有的直下式背光模组是将发光光源例如 CCFL(Cold Cathode Fluorescent Lamp , 阴极黄光灯管)或 LED(Light Emitting Diode , 发 光二极管)设置在液晶面板后方， 直接形成面光源提供给液晶面板， CCFL 与 LED相比具有高功耗、 高发热量、 寿命短等缺点， CCFL逐渐被 LED 所取代， 但以 LED 为发光光源的背光模组的厚度较以 CCFL为发光光源 的背光模组的厚度大两倍以上， 不利于液晶显示装置的薄型化。 发明内容
本发明的目的在于提供一种直下式背光模组， 结构简单， 成本低， 且 利于实现液晶显示装置的薄型化。
为实现上述目的， 本发明提供一种直下式背光模组， 包括： 背板、 卡 在背板上的数条 LED灯条、 与 LED灯条间隔设置的数条导光板及置于背 板上的扩散板。
所述背板包括底板及连接于底板的侧板。
所述 LED灯条与导光板间隔设置于底板上。
每一导光板的两侧均设有两个限位板， 用于将导光板限位于底板上。 所述限位板包括一端垂直安装于底板的支撑部及由支撑部延伸出的平 行于底板的卡合部。
所述限位板由透光性材料制成。
所述 LED 灯条包括 PCB 板及安装并电性连接于 PCB 板上的数个 LED灯。
所述扩散板为一体成型的板状结构。
所述扩散板包括数个板块， 该数个板块与导光板间隔设置， 且位于导 光板的上方。
所述板块固定连接于所述限位板的支撑部远离底板的一端。
本发明还提供一种直下式背光模组， 包括： 背板、 卡在背板上的数条
LED灯条、 与 LED灯条间隔设置的数条导光板及置于背板上的扩散板； 其中， 所述背板包括底板及连接于底板的侧板；
其中， 所述 LED灯条与导光板间隔设置于底板上；
其中， 每一导光板的两侧均设有两个限位板， 用于将导光板限位于底 板上；
其中， 所述限位板包括一端垂直安装于底板的支撑部及由支撑部延伸 出的平行于底板的卡合部；
其中， 所述限位板由透光性材料制成；
其中， 所述 LED灯条包括 PCB板及安装并电性连接于 PCB板上的数 个 LED灯；
其中， 所述扩散板为一体成型的板状结构。
本发明的有益效果： 本发明提供的直下式背光模组， 其通过在 LED 灯条之间设置导光板， 提高了 LED 灯条的光能利用率， 进而可以减少 LED 灯条上 LED 灯的数量， 进而降低生产成本， 同时， 导光板的使用， 可有效的缩短混光距离， 在增强了光照均匀度的同时， 减薄了背光模组的 厚度， 利于实现液晶显示装置的薄型化。
为了能更进一步了解本发明的特征以及技术内容， 请参阅以下有关本 发明的详细说明与附图， 然而附图仅提供参考与说明用， 并非用来对本发 明加以限制。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其它有益效果显而易见。
附图中，
图 1为本发明直下式背光模组一实施例结构示意图；
图 2为图 1中直下式背光模组的 LED灯条及导光板的分布示意图； 图 3为本发明直下式背光模组另一实施例结构示意图。 具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果， 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 1 及图 2 , 本发明提供一种直下式背光模组， 包括： 背板 2、 设于背板 2上的数条 LED灯条 4、 与 LED灯条 4间隔设置的数条导光 板 6及设于背板上的扩散板 8。 由于导光板 6的设置， 延长了 LED灯条 4 所发出的光线的混光距离， 进而增强了混光效果， 提高了光照均勾度， 同 时， 提高了 LED灯条发出的光线的利用率， 有效降低了成本。
所述背板 2包括底板 22及连接于底板 22的侧板 24。
所述 LED灯条 4与导光板 6间隔设置于底板 22上。
每一导光板 6的两侧均设有两个限位板 62, 用于将导光板 6限位于底 板 22上。
所述限位板 62包括一端垂直安装于底板 22的支撑部 622及由支撑部 622延伸出的平行于底板 22的卡合部 624。
所述限位板 62 由透光性材料制成， 优选高透光性材料， 进而使得 LED灯条 4发出的光线能更多的进入导光板 6中， 进而提高 LED灯条 4 的光线的利用率， 降低功率消耗， 进而降低成本。
所述 LED灯条 4包括 PCB板 42及安装并电性连接于 PCB板 42上的 数个 LED灯 44。 所述 LED灯 44发出的光线部分直接进入扩散板 8中 , 部分穿过限位板 62进入导光板 6, 经导光板 6折射、 反射后进入扩散板， 提高了光能的利用率， 相比现有的 LED 灯条， 本发明直下式背光模组的 LED灯条 4上的 LED灯的颗数可适当减少， 进而降低了生产成本。
在本实施例中， 所述扩散板 8 为一体成型的板状结构， 其承载于背板 2的侧板 24上， 同时， 所述限位板 62的支撑部 622远离底板 22的一端也 可以用于支撑扩散板 8, 以加强对扩散板 8的支撑。 在无光学膜片组 （film ) 的情况下， 本发明的直下式背光模组的厚度 一般为两条 LED灯条之间间距（pitch ) 的 0.3倍以上， 如 0.5倍， 能够极 大的减薄直下式背光模组的厚度， 为液晶显示装置的薄型化提供了前提。
请参阅图 3 , 为本发明直下式背光模组另一实施例结构示意图， 在本 实施例中， 所述扩散板 8，包括数个板块 82，， 该数个板块 82，与导光板 6间 隔设置， 且位于导光板 6的上方， 优选的， 所述板块 82，的数量比 LED灯 条 4的数量多两块， 其位于背板 2两侧的两块分别承载于侧板 24与限位 板 62上， 其余的均承载于两限位板 62上， 优选的， 所述板块 82，固定连 接于所述限位板 62的支撑部 622远离底板 22的一端。
综上所述， 本发明提供的直下式背光模组， 其通过在 LED 灯条之间 设置导光板， 提高了 LED灯条的光能利用率， 进而可以减少 LED灯条上 LED灯的数量， 进而降低生产成本， 同时， 导光板的使用， 可有效的缩短 混光距离， 在增强了光照均匀度的同时， 减薄了背光模组的厚度， 利于实 现液晶显示装置的薄型化。
以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形， 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
I、 一种直下式背光模组， 包括： 背板、 卡在背板上的数条 LED 灯 条、 与 LED灯条间隔设置的数条导光板及置于背板上的扩散板。
2、 如权利要求 1 所述的直下式背光模组， 其中， 所述背板包括底板 及连接于底板的侧板。
3、 如权利要求 2所述的直下式背光模组， 其中， 所述 LED灯条与导 光板间隔设置于底板上。
4、 如权利要求 3 所述的直下式背光模组， 其中， 每一导光板的两侧 均设有两个限位板， 用于将导光板限位于底板上。
5、 如权利要求 4 所述的直下式背光模组， 其中， 所述限位板包括一 端垂直安装于底板的支撑部及由支撑部延伸出的平行于底板的卡合部。
6、 如权利要求 4 所述的直下式背光模组， 其中， 所述限位板由透光 性材料制成。
7、 如权利要求 1所述的直下式背光模组， 其中， 所述 LED灯条包括
PCB板及安装并电性连接于 PCB板上的数个 LED灯。
8、 如权利要求 1 所述的直下式背光模组， 其中， 所述扩散板为一体 成型的板状结构。
9、 如权利要求 1 所述的直下式背光模组， 其中， 所述扩散板包括数 个板块， 该数个板块与导光板间隔设置， 且位于导光板的上方。
10、 如权利要求 9所述的直下式背光模组， 其中， 所述板块固定连接 于所述限位板的支撑部远离底板的一端。
I I、 一种直下式背光模组， 包括： 背板、 卡在背板上的数条 LED 灯 条、 与 LED灯条间隔设置的数条导光板及置于背板上的扩散板；
其中， 所述背板包括底板及连接于底板的侧板；
其中， 所述 LED灯条与导光板间隔设置于底板上；
其中， 每一导光板的两侧均设有两个限位板， 用于将导光板限位于底 板上；
其中， 所述限位板包括一端垂直安装于底板的支撑部及由支撑部延伸 出的平行于底板的卡合部；
其中， 所述限位板由透光性材料制成；
其中， 所述 LED灯条包括 PCB板及安装并电性连接于 PCB板上的数 个 LED灯； 其中， 所述扩散板为一体成型的板状结构。
PCT/CN2012/085774 2012-09-14 2012-12-04 直下式背光模组 Ceased WO2014040344A1 (zh)

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