WO2013139049A1 - 侧入式背光模组 - Google Patents

侧入式背光模组 Download PDF

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Publication number
WO2013139049A1
WO2013139049A1 PCT/CN2012/073170 CN2012073170W WO2013139049A1 WO 2013139049 A1 WO2013139049 A1 WO 2013139049A1 CN 2012073170 W CN2012073170 W CN 2012073170W WO 2013139049 A1 WO2013139049 A1 WO 2013139049A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
phosphor layer
light guide
backlight
Prior art date
Application number
PCT/CN2012/073170
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English (en)
French (fr)
Inventor
王烨文
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/509,997 priority Critical patent/US20130242611A1/en
Publication of WO2013139049A1 publication Critical patent/WO2013139049A1/zh

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Classifications

    • 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
    • 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, and in particular to a side-lit backlight module. Background technique
  • the existing side-lit backlight module generally includes a back plate, a backlight source disposed in the back plate, a reflective sheet, a light guide plate, and an optical film.
  • the existing backlight source generally adopts a white LED (white LED, a tube scale).
  • WLED replaces the traditional Cold Cathode Fluorescent Lamp (CCFL). In contrast, WLED is more environmentally friendly and more efficient than CCFL.
  • the existing WLED is encapsulated by a phosphor and a light source chip, and has the following disadvantages: 1. When the light emitted by the light source chip passes through the phosphor, there is a difference in optical path length, resulting in a severe color shift.
  • the white light emitted by the WLED passes through the light guide plate whose side is flat. The refraction occurs when the light is routed to the light and the light is concentrated to reduce the uniformity.
  • an existing edge-lit backlight module includes a light source module 100 that emits blue light, and a light guide plate 200.
  • the light incident surface of the light guide plate 200 is provided with a light-emitting surface.
  • the phosphor film 300 is excited by blue light to generate white light.
  • the phosphor film 300 includes a phosphor and a colloid.
  • the phosphor film 300 is separated from the light source module 100, which can effectively prevent the light decay caused by the phosphor, but fails. Solve the problem of uneven light mixing and serious spotlighting points. Summary of the invention
  • the object of the present invention is to provide a side-in type backlight module, which effectively eliminates the light collecting point, has uniform light output, high light intensity and long service life.
  • the present invention provides a side-lit backlight module, including: a backlight for emitting blue light, a light guide plate, and a phosphor layer, the light guide plate including a light incident surface, the backlight corresponding to the light
  • the phosphor layer is disposed on the light incident surface of the light guide plate through an adhesive layer, and the end surface of the adhesive layer contacting the phosphor layer is a smooth continuous curved surface, and the phosphor layer is along the curved surface
  • the phosphor layer is excited by the blue light emitted by the backlight to generate white light, and the white light passes through the adhesive layer to enter the light guide plate.
  • the backlight comprises a circuit board, and a plurality of LED chips arranged on the circuit board and electrically connected to the circuit board for emitting blue light, the plurality of LED chips facing the phosphor layer.
  • the end surface of the adhesive layer in contact with the phosphor layer is a smooth continuous convex curved surface.
  • the end surface of the adhesive layer in contact with the phosphor layer is a smooth continuous curved surface.
  • the side-lit backlight module of the present invention separates the phosphor layer from the backlight, which can extend the service life of the module and the backlight, reduce the degree of color shift of the module, and at the same time
  • the end face of the phosphor layer is set as a smooth continuous curved surface, and the phosphor layer is disposed along the curved surface to more uniformly distribute the light, reduce the concentration point, and improve the uniformity of the light guide plate.
  • FIG. 1 is a schematic structural view of a side-entry backlight module in the prior art
  • FIG. 2 is a partial structural schematic view of an embodiment of a side-lit backlight module of the present invention
  • FIG. 3 is a partial structural schematic view of still another embodiment of the side-entry backlight module of the present invention. detailed description
  • the edge-lit backlight module comprises: a backlight for emitting blue light, a light guide plate 4 , and a phosphor layer 6 , wherein the light guide plate 4 includes a light incident surface 42 and is fluorescent. Powder The layer 6 is disposed on the light incident surface 42 of the light guide plate 4 through an adhesive layer 8.
  • the backlight 2 preferably includes a circuit board 22, and a plurality of electrodes disposed on the circuit board 22 and electrically connected to the circuit board 22 for emitting blue light.
  • the LED chip 24, the backlight 2 corresponding to the light incident surface 42 is disposed on the side of the light guide plate 4, and the plurality of LED chips 24 of the backlight 2 face the phosphor layer 6, thereby forming a side-entry backlight module.
  • the end surface of the adhesive layer 8 in contact with the phosphor layer 6 is a smooth continuous curved surface, and the phosphor layer 6 is disposed along the curved surface.
  • the phosphor layer 6 is excited by the blue light emitted by the backlight 2 to generate white light, and the white light passes through.
  • the layer 8 is pasted and enters the light guide plate 4.
  • the adhesive layer 8 is preferably provided in a transparent shape.
  • the end surface of the adhesive layer 8 in contact with the phosphor layer 6 may be a smooth continuous convex curved surface 82.
  • the setting of the curved surface facilitates the uniform dispersion of light into the light guide plate 4, eliminates the light collecting point, improves the light guiding uniformity of the light guiding plate 4, and makes the light output uniform.
  • the end face of the adhesive layer 8, which is in contact with the phosphor layer 6, may be a concave curved surface 82 (as shown in FIG. 3) or other types of curved surfaces.
  • the backlight 2 is separated from the light guide plate 4 and disposed on the side of the light guide plate 4, so that the backlight 2 is separated from the phosphor layer 6 disposed on the light guide plate 4, and blue light is used as a light source. Improve light intensity, reduce color shift and improve light color.
  • the backlight 2 emits blue light to the phosphor layer 6, and the blue light is converted into white light through the phosphor layer 6.
  • the white light is more uniformly dispersed into the light guide plate 4 after passing through the curved surface of the adhesive layer 8, so that no optical path difference occurs, thereby eliminating The light collecting point ensures the light guiding uniformity of the light guide plate 4.
  • the side-lit backlight module of the present invention separates the phosphor layer from the backlight, which can extend the service life of the module and the backlight, reduce the degree of color shift of the module, and simultaneously pass the adhesive layer and the fluorescent layer.
  • the end face of the powder layer is set as a smooth continuous curved surface, and the phosphor layer is disposed along the curved surface to achieve more uniform dispersion of light, reduce the concentration point, improve the uniformity of the light guide plate, and use the subsequent high lumen LED. , can reduce the number of LEDs to reduce costs.

Abstract

公开了一种侧入式背光模组，包括：用于发出蓝光的背光源（2）、导光板（4）和荧光粉层（6），该导光板（4）包括入光面（42），该背光源（2）对应该入光面（42）设置于该导光板（4）的侧边，荧光粉层（6）通过粘贴层（8）设于该导光板（4）的入光面（42）上，该粘贴层（8）与该荧光粉层（6）接触的端面为平滑连续的曲面，该荧光粉层（6）沿该曲面设置，该荧光粉层（6）受背光源（2）发出的蓝光激发而产生白光，白光穿过该粘贴层（8）而进入该导光板（4）。由此能够使光线更均匀分散，减少聚光点，提高导光板均匀度。

Description

侧入式背光模组 技术领域
本发明涉及液晶显示领域， 尤其涉及一种侧入式背光模组。 背景技术
液晶显示装置筒称 LCD ( Liquid Crystal Display ) , 其工作原理是在 两片平行的玻璃当中放置液晶分子， 两片玻璃中间有许多垂直和水平的细 小电线， 透过通电与否来控制液晶分子改变方向， 将光线折射出来产生画 面。 由于液晶显示装置具有机身薄、 省电、 无辐射等众多优点， 因此得到 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器， 其一般包括液晶面板及背光模组（backlight module ) 。 背光模组可依照光 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， 以便提供 背光源至液晶显示屏。 现有的侧入式背光模组结构一般包括背板、 设于背 板内的背光光源、 反射片、 导光板及光学膜片等， 现有背光光源一般采用 白色发光二极管 （white LED , 筒称 WLED )来取代传统的冷阴极萤光灯 管 （Cold Cathode Fluorescent Lamp, 筒称 CCFL ) , 相对而言， WLED比 CCFL更加环保， 且效率更高。
现有的 WLED是由荧光粉与光源芯片封装而成， 其具有以下缺点： 1、 光源芯片发出的光经过荧光粉时， 存在光程差异， 导致色偏严 重。
2、 WLED 发出的白光穿过侧面为平面的导光板， 光路由光疏到光密 时发生的折射使得光线被集中， 降低均匀度。
3、 LED之间容易因混光不均匀， 产生严重的聚光点。
4、 作为背光源的 WLED在使用过程中， 因 LED光源芯片产生的热量 容易使荧光粉受热， 发生光衰， 荧光粉的发光效率降低严重， 影响模组光 强。
对于解决上述问题， 如图 1 所示， 现有的一种侧光式背光模组， 其包 括发出蓝光的光源模组 100、 导光板 200, 所述导光板 200 的入光面设置 有一用于受蓝光激发产生白光的荧光粉膜 300, 荧光粉膜 300 包括荧光粉 和胶质， 其荧光粉膜 300与光源模组 100分离设置， 能有效避免荧光粉受 热导致的光衰现象， 却未能解决混光不均匀， 产生严重的聚光点的问题。 发明内容
本发明的目的在于提供一种侧入式背光模组， 有效消除聚光点， 出光 均匀、 光强高且使用寿命长。
为实现上述目的， 本发明提供一种侧入式背光模组， 包括： 用于发出 蓝光的背光源、 导光板、 及荧光粉层， 该导光板包括入光面， 该背光源对 应该入光面设置于该导光板的侧边， 荧光粉层通过一粘贴层设于导光板的 入光面上， 该粘贴层与荧光粉层接触的端面为平滑连续的曲面， 荧光粉层 沿着该曲面设置， 荧光粉层受背光源发出的蓝光激发而产生白光， 白光穿 过粘贴层而进入导光板。
所述背光源包括电路板、 及设于电路板上且电性连接电路板的数个用 于发出蓝光的 LED芯片， 该数个 LED芯片正对荧光粉层。
所述粘贴层与荧光粉层接触的端面为平滑连续的凸状曲面。
所述粘贴层与荧光粉层接触的端面为平滑连续的 状曲面。
本发明的有益效果： 本发明侧入式背光模组， 其将荧光粉层与背光源 分离设置， 可以延长模组、 背光源的使用寿命， 减少模组色偏程度， 同时 通过将粘贴层与荧光粉层接触的端面设为平滑连续的曲面， 荧光粉层沿着 该曲面设置， 使光线更均匀分散， 减少聚光点， 提高了导光板均匀度。
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为现有技术中的一种侧入式背光模组的结构示意图；
图 2为本发明侧入式背光模组一实施例的局部结构示意图；
图 3为本发明侧入式背光模组又一实施例的局部结构示意图。 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。
如图 2所示， 本发明所提供的侧入式背光模组， 包括： 用于发蓝光的 背光源 2、 导光板 4、 及荧光粉层 6, 该导光板 4 包括入光面 42, 荧光粉 层 6通过一粘贴层 8设于导光板 4的入光面 42上， 该背光源 2优选包括 电路板 22、 及设于电路板 22上且电性连接电路板 22的数个用于发出蓝光 的 LED芯片 24, 背光源 2对应入光面 42设置于导光板 4的侧边， 背光源 2的数个 LED芯片 24正对荧光粉层 6, 从而形成侧入式背光模组。
特别的， 该粘贴层 8与荧光粉层 6接触的端面为平滑连续的曲面， 荧 光粉层 6沿着该曲面设置， 荧光粉层 6受背光源 2发出的蓝光激发而产生 白光， 白光穿过粘贴层 8而进入导光板 4。 粘贴层 8优选透明状设置。 本 实施例中， 该粘贴层 8与荧光粉层 6接触的端面可为平滑连续的凸状曲面 82。 曲面的设置有利于光均匀分散地进入导光板 4, 消除聚光点， 提高导 光板 4导光均匀度， 使出光均匀。 在其它实施例中， 该粘贴层 8，与荧光粉 层 6，接触的端面可为凹状曲面 82， （如图 3所示）或其它类型曲面。
在本发明中， 背光源 2与导光板 4相分离而设于导光板 4侧边， 从而 背光源 2 与设于导光板 4 上的荧光粉层 6分离设置， 且采用蓝光作为光 源， 可达到提高光强、 减少色偏程度及改善光色的目的。
工作时， 背光源 2发出蓝光射向荧光粉层 6, 蓝光经由该荧光粉层 6 转换为白光， 白光经过粘贴层 8 的曲面后更均匀分散进入导光板 4, 不发 生光程差异， 从而消除了聚光点， 保证了导光板 4导光均匀性。
综上所述， 本发明侧入式背光模组， 其将荧光粉层与背光源分离设 置， 可以延长模组、 背光源的使用寿命， 减少模组色偏程度， 同时通过将 粘贴层与荧光粉层接触的端面设为平滑连续的曲面， 荧光粉层沿着该曲面 设置， 以达到将光线更均匀分散， 减少聚光点， 提高了导光板均匀度， 且 对于后续的高流明 LED的使用， 可以减少 LED的颗数以降低成本。
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
1、 一种侧入式背光模组， 包括： 用于发出蓝光的背光源、 导光板、 及荧光粉层， 该导光板包括入光面， 该背光源对应该入光面设置于该导光 板的侧边， 荧光粉层通过一粘贴层设于导光板的入光面上， 该粘贴层与荧 光粉层接触的端面为平滑连续的曲面， 荧光粉层沿着该曲面设置， 荧光粉 层受背光源发出的蓝光激发而产生白光， 白光穿过粘贴层而进入导光板； 其中， 所述背光源包括电路板及设于电路板上且电性连接电路板的数 个用于发出蓝光的 LED芯片， 该数个 LED芯片正对荧光粉层。
2、 如权利要求 1 所述的侧入式背光模组， 其中， 所述粘贴层与荧光 粉层接触的端面为平滑连续的凸状曲面。
3、 如权利要求 1 所述的侧入式背光模组， 其中， 所述粘贴层与荧光 粉层接触的端面为平滑连续的 状曲面。
PCT/CN2012/073170 2012-03-19 2012-03-28 侧入式背光模组 WO2013139049A1 (zh)

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US13/509,997 US20130242611A1 (en) 2012-03-19 2012-03-28 Side-Edge Backlight Module

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CN2012100731296A CN102588851A (zh) 2012-03-19 2012-03-19 侧入式背光模组

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