WO2014067182A1 - 背光模组耦光设计 - Google Patents

背光模组耦光设计 Download PDF

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Publication number
WO2014067182A1
WO2014067182A1 PCT/CN2012/084797 CN2012084797W WO2014067182A1 WO 2014067182 A1 WO2014067182 A1 WO 2014067182A1 CN 2012084797 W CN2012084797 W CN 2012084797W WO 2014067182 A1 WO2014067182 A1 WO 2014067182A1
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WIPO (PCT)
Prior art keywords
guide plate
light guide
light
heat sink
backlight module
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/CN2012/084797
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English (en)
French (fr)
Inventor
张彦学
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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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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/806,749 priority Critical patent/US20140119055A1/en
Publication of WO2014067182A1 publication Critical patent/WO2014067182A1/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
    • 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
    • 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
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the invention relates to a backlight module, and in particular to a light coupling design of a backlight module. Background technique
  • the backlight module is one of the key components of liquid crystal display products, and has been widely used in various electronic products such as digital personal assistants (PDAs), digital cameras, satellite navigation systems, and flat-panel televisions.
  • PDAs digital personal assistants
  • LED backlights are a major trend in replacing cold cathode fluorescent tubes.
  • LED backlights can be divided into direct-lit LED backlight modules and side-in LED backlights depending on where the light source is located. Module.
  • the direct-lit LED backlight module mainly arranges the LED die uniformly behind the liquid crystal panel as a light source, so that the backlight can be uniformly transmitted to the entire panel;
  • the side-input LED backlight module mainly arranges the LED die in the panel four
  • the edges, when the LED is illuminated, are transported through the light guide (LGP) to the area in the center of the panel. Since the side-in LED backlight module has a light source disposed on the side of the light guide plate, it is more suitable for a small-sized liquid crystal display product, and thus is increasingly favored.
  • the current mass-produced side-in LED backlight module uses a light guide (LGP) as a light guide.
  • LGP light guide
  • two slits are cut through the light guide plate, and a positioning post is arranged at the slit to mount the light guide plate on the aluminum extrusion, the LED is located on one side of the light guide plate, and is fixed in the aluminum extrusion on.
  • the distance between the LGP and the LED seriously affects the coupling efficiency. If the distance between the LGP and the LED is large, the coupling efficiency will decrease.
  • the coupling distance between the LED and the light guide plate in the backlight module is difficult to ensure, because there are many factors affecting the coupling distance, for example: diameter accuracy of the positioning post for mounting the light guide plate, and cutting of the light guide plate Cut-tolerance, LED surface mount and manufacturing tolerances for printed circuit boards and thickness of thermal pad.
  • the main influencing factor is the positioning and size variation of LGP. If the positioning design of LGP is controlled, the coupling distance should be well controlled.
  • FIG. 1 it is a schematic diagram of the relationship between the coupling distance and the light effect.
  • the horizontal axis is the coupling distance (mm) and the vertical axis is the efficiency.
  • the smaller the coupling distance the more the coupling efficiency. high.
  • FIG. 2 it is a schematic diagram of a positioning structure of a light guide plate in the prior art. In this design, the light guide plate 1 is disposed on the back plate 2, and the position of the light guide plate 1 on the back plate 2 is positioned by the positioning post 3.
  • the positioning post 3 can be rivet, and the rivet is positioned in the middle of the light guide plate 1, so Rivets are provided on the back plate 2, and the light guide plate 1 needs to be pre-cut to leave a slit for positioning the rivet. Component tolerances, assembly tolerances, and expansion may be released to the light entrance side, and the coupling distance is unstable. Summary of the invention
  • the object of the present invention is to provide a light-coupled design of a backlight module, which simplifies the positioning structure of the light guide plate and improves the coupling efficiency of the light guide plate with the LED.
  • the present invention provides a backlight module coupling design, including: a heat sink, an LED light bar, a light guide plate and a back plate, the heat sink is located on the light incident side of the light guide plate and is fixed on the back plate.
  • the LED strip is fixed on the heat sink and faces the light incident side of the light guide plate.
  • the heat sink is provided with a convex hull toward the light incident side of the light guide plate, and the top of the convex hull contacts the light incident of the light guide plate.
  • the side is configured to limit the displacement of the light guide plate in the light incident direction, and the light side of the light guide plate and the side wall of the back plate are filled with an elastic structure.
  • the elastic structure is a spring.
  • the elastic structure is an elastic material.
  • the side wall of the back plate is provided with a boss facing one side of the light guide plate to contact the light guide plate, and the side wall of the back plate and the light guide plate are further A buffer material is filled between one side.
  • the heat sink is provided with a screw hole, and the heat sink is fixed to the back plate by bolts.
  • a convex hull is arranged on each side of the heat sink.
  • the convex hull is formed by stamping.
  • the height error of the convex hull is controlled within 0.1 mm.
  • the distance between the light guide plate and the LED light bar is 0.2 mm.
  • the present invention also provides a backlight module coupling design, comprising: a heat sink, an LED light bar, a light guide plate and a back plate, the heat sink is located on the light incident side of the light guide plate and is fixed on the back plate, the LED light The strip is fixed on the heat sink and faces the light incident side of the light guide plate.
  • the heat sink is provided with a convex package facing the light incident side of the light guide plate, and the top of the convex cover contacts the light incident side of the light guide plate to limit the strip. a displacement of the light guide plate in the light incident direction, and an elastic structure is filled between the light side of the light guide plate and the side wall of the back plate;
  • the elastic structure is a spring
  • the side wall of the back plate is provided with a boss facing one side of the light guide plate to contact the light guide plate, and the side wall of the back plate and the light guide plate are further a buffer material is filled between one side;
  • the heat sink is provided with a screw hole, and the heat sink is fixed to the back plate by bolts; Wherein, a heat sink is disposed on each side of the heat sink;
  • the convex hull is formed by stamping
  • the height error of the convex hull is controlled within 0.1 mm;
  • the distance between the light guide plate and the LED light bar is 0.2 mm.
  • the light-coupled design of the backlight module of the invention can improve the coupling efficiency of the module and simplify the assembly structure of the light guide plate; eliminate the cutting structure of the back plate rivet and the light guide plate, and simplify the assembly structure of the light guide plate and the back plate.
  • Figure 1 is a schematic diagram showing the relationship between the coupling distance and the light effect
  • FIG. 2 is a schematic view showing a positioning structure of a light guide plate in the prior art
  • FIG. 3 is a schematic diagram of a light source side positioning manner of a light guide plate in a light coupling design of a backlight module according to the present invention
  • FIG. 4 is a schematic view showing an embodiment of a light side positioning mode of a light guide plate in a light coupling design of a backlight module according to the present invention
  • FIG. 5 is a schematic diagram of another embodiment of a light-side positioning method of a light guide plate in a light-coupled design of a backlight module according to the present invention
  • FIG. 6 and FIG. 7 are schematic diagrams showing the assembly manner perpendicular to the light incident direction in the light coupling design of the backlight module of the present invention.
  • FIG. 8 is a schematic diagram of a heat sink and a positioning structure thereof in a light coupling design of a backlight module of the present invention. detailed description
  • FIG. 3 it is a schematic diagram of a light source side positioning manner of a light guide plate in a light coupling design of a backlight module of the present invention.
  • the light-receiving design of the backlight module of the present invention includes: a heat sink 10, an LED light bar 20, a light guide plate 30, and a back plate 40.
  • the heat sink 10 is located on the light-incident side of the light guide plate 30 and is fixed on the back plate 40.
  • the LED strip 20 is fixed on the heat sink 10 and faces the light incident side of the light guide plate 30.
  • the heat sink 10 is provided with a convex hull 50 facing the light incident side of the light guide plate 30, and the convex hull 50
  • the top portion contacts the light incident side of the light guide plate 30 to limit the displacement of the light guide plate 30 in the light incident direction, and the light side of the light guide plate 30 and the side wall of the back plate 40 are filled with an elastic structure.
  • the convex hull 50 can be formed by stamping.
  • the LED light bar 20 is attached to the heat sink 10, and the heat sink 10 is provided with a convex hull 50.
  • the top of the convex hull 50 is in contact with the light guide plate 30. Since the stamping member has a stable size, the coupling distance can be effectively controlled.
  • FIG. 4 is a schematic diagram of an embodiment of a light guide plate positioning manner on the optical side.
  • FIG. 5 is a schematic diagram of another embodiment of a light guide plate positioning manner on a light side.
  • a spring 61 as an elastic structure is filled between the opposite side of the light guide plate 31 and the side wall of the back plate 41.
  • the opposite side of the light guide plate 32 and the side wall of the back plate 42 are filled with an elastic material 62 as an elastic structure.
  • the elastic material 62 can be formed in the form of an elastic pad, and a rubber material can be specifically used.
  • the light side is filled with a spring 61 or an elastic material 62, which can effectively absorb the tolerance of the material and the amount of expansion, and avoid the deformation of the size of the LGP and the bending of the light guide plate.
  • the backlight module of the present invention is designed to couple light on the heat sink of the backlight strip (Light-Bar) to limit the displacement of the light guide plate on the light incident side, and to position the light guide plate on the light side with a spring or an elastic material;
  • Sheet metal stamping has good dimensional processability, and the height error of the convex hull can be controlled within 0.1mm, so that the light-input side can ensure a small coupling distance, and the elastic structure on the light side can effectively absorb the manufacturing tolerance of the light guide plate.
  • the amount of expansion caused by heat and moisture, avoiding warpage when the size of the light guide plate varies.
  • FIG. 6 and FIG. 7 it is a schematic diagram of an assembly manner perpendicular to the light incident direction in the light coupling design of the backlight module of the present invention.
  • the side wall of the back plate 43 is provided with a boss 70 facing the side of the light guide plate 33 to contact the light guide plate 33, and the side wall of the back plate 43 and the light guide plate 33 A buffer material 80 is filled between the other side. Since the direction does not affect the coupling distance, the direction can be positioned on the side wall design boss 70 of the back plate 43.
  • the side of the light guide plate 33 is flush with the boss 70 of the back plate 43 and the other side is filled with the buffer material 80. Effectively control the displacement of the light guide plate; one end is assembled with zero gap, and the other end is buffered to avoid warpage caused by dimensional variation of the light guide plate 33.
  • FIG. 8 it is a schematic diagram of a heat sink and a positioning structure thereof in a light-coupled design of a backlight module of the present invention.
  • the heat sink 1 1 is provided with a screw hole, and the heat sink 1 1 can be fixed to the back plate by bolts.
  • the heat sink 11 may be provided with a convex hull 51 on each side, or alternatively, an appropriate number of convex hulls may be disposed at appropriate positions.
  • the light guide plate positioning mode in the light coupling design of the backlight module of the invention can control the distance between the light guide plate and the LED to a minimum value (0.2 mm), and improve the light effect by about 3%; meanwhile, the design can control the light guide plate The displacement and the reduction of variation to achieve stability of the coupling distance.
  • the advantages of the backlight module coupling design of the present invention are: 1. The module coupling efficiency is improved; 2. The back panel rivet and the LGP cutting structure are eliminated, the LGP and the back panel assembly structure are simplified, and the component cost is realized. Optimization.

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

Abstract

背光模组耦光设计，包括散热片（10）、LED灯条（20）、导光板（30）及背板（40）。散热片（10）位于导光板（30）的入光侧并固定在背板（40）上。LED灯条（20）固定在散热片（10）上并朝向导光板（30）的入光侧。散热片（10）上设有朝向导光板（30）的入光侧的凸包（50）。凸包（50）的顶部接触导光板（30）的入光侧以限制导光板（30）在入光方向的位移。导光板（30）的对光侧与背板（40）的侧墙之间填充有弹性结构（61，62）。该背光模组耦光设计取消了背板铆钉及导光板裁切结构，可以提升模组耦光效率，简化导光板及背板装配结构。

Description

背光模组耦光设计 技术领域
本发明涉及背光模组， 尤其涉及一种背光模组耦光设计。 背景技术
背光模组是液晶显示器产品的关键零组件之一， 目前已普遍应用于数 字个人助理 （PDA ) 、 数字相机、 卫星导航系统以及平面电视等各种电子 产品上。 随着 LED 终端应用也越来越多， LED 背光源取代冷阴极荧光灯 管肯定是大势所趋， 其中， LED 的背光源可根据光源的所在位置分为直下 式 LED背光模组与侧入光式 LED背光模组。 直下式 LED背光模组主要将 LED 晶粒均匀地配置在液晶面板的后方作为发光源， 使背光可以均匀传达 到整个面板； 侧入光式 LED背光模组主要将 LED晶粒配置在面板的四个 边缘， 当 LED发光时， 通过导光板（LGP )输送到面板中央的区域。 由于 侧入光式 LED 背光模组将光源设于导光板的侧边， 较适合应用于小尺寸 的液晶显示产品， 因此日益受到青睐。
现行量产的侧入光式 LED背光模组均会用到导光板（LGP )作为导光 元件。 现有技术带有铝挤的背光模组中， 通过导光板上剪裁两个切口， 在 切口处设置定位柱将导光板安装在铝挤上， LED位于导光板的一侧， 且固 定在铝挤上。 在产品设计中， LGP 同 LED之间的距离严重影响到耦光效 率， 若 LGP 同 LED距离较大， 则会出现耦光效率下降的问题； 若如耦光 距离偏小， 则会出现 LED被 LGP压坏或 LGP被高温熔化的问题； 为此， LGP 同 LED 的耦光距离成为了侧光式背光设计的难点及重点之一。 现有 技术提供的背光模组中 LED 与导光板的耦光距离难以得到保证， 这是因 为影响耦光距离的因素很多， 例如： 用于安装导光板的定位柱的直径精 度、 导光板的裁切公差、 LED表面贴装与印刷电路板的制造公差和散热焊 盘的厚度等多个因素。 对于耦光距离而言， 主要的影响因素是 LGP的定位 及尺寸变异， 若控制 LGP的定位设计， 则耦光距离应会得到很好的控制。
参见图 1 所示， 其为耦光距离同光效的关系示意图， 横轴为耦光距离 (毫米） ， 纵轴为效率， 从图中可以看出， 耦光距离越小， 耦光效率越 高。 参见图 2所示， 其为现有技术中的导光板定位结构示意图， 在此设计 中， 导光板 1设置于背板 2上， 导光板 1在背板 2上的位置由定位柱 3定 位。 定位柱 3可以采用铆钉， 铆钉于导光板 1 中间位置定位， 因此需要在 背板 2 上设置铆钉， 而且导光板 1 上需要预先裁切留出供铆钉定位的切 口。 部材公差、 装配公差及膨胀量可能被释放到入光侧， 耦光距离不稳 定。 发明内容
因此， 本发明的目的在于提供一种背光模组耦光设计， 简化导光板定 位结构， 提升导光板同 LED耦光效率。
为实现上述目的， 本发明提供一种背光模组耦光设计， 包括： 散热 片、 LED灯条、 导光板及背板， 该散热片位于该导光板的入光侧并固定在 该背板上， 该 LED 灯条固定在该散热片上并朝向该导光板的入光侧， 该 散热片上设有朝向该导光板的入光侧的凸包， 所述凸包的顶部接触该导光 板的入光侧以限制该导光板在入光方向的位移， 该导光板的对光侧与该背 板的侧墙之间填充有弹性结构。
其中， 该弹性结构为弹簧。
其中， 该弹性结构为弹性材料。
其中， 在垂直于入光方向的方向上， 该背板的侧墙上设有朝向该导光 板的一侧的凸台以接触该导光板， 在该背板的侧墙与该导光板的另一侧之 间填充有緩冲材料。
其中， 该散热片上设有螺孔， 该散热片通过螺栓固定至该背板上。 其中， 该散热片两侧各设有一个凸包。
其中， 该凸包为冲压形成。
其中， 该凸包的高度误差控制在 0.1毫米以内。
其中， 该导光板同 LED灯条之间的距离为 0.2毫米。
本发明还提供一种背光模组耦光设计， 包括： 散热片、 LED灯条、 导 光板及背板， 该散热片位于该导光板的入光侧并固定在该背板上， 该 LED 灯条固定在该散热片上并朝向该导光板的入光侧， 该散热片上设有朝向该 导光板的入光侧的凸包， 所述凸包的顶部接触该导光板的入光侧以限制该 导光板在入光方向的位移， 该导光板的对光侧与该背板的侧墙之间填充有 弹性结构；
其中， 该弹性结构为弹簧；
其中， 在垂直于入光方向的方向上， 该背板的侧墙上设有朝向该导光 板的一侧的凸台以接触该导光板， 在该背板的侧墙与该导光板的另一侧之 间填充有緩冲材料；
其中， 该散热片上设有螺孔， 该散热片通过螺栓固定至该背板上； 其中， 该散热片两侧各设有一个凸包；
其中， 该凸包为冲压形成；
其中， 该凸包的高度误差控制在 0.1毫米以内；
其中， 该导光板同 LED灯条之间的距离为 0.2毫米。
本发明的背光模组耦光设计可以提升模组耦光效率， 简化导光板装配 结构； 取消背板铆钉及导光板裁切结构， 简化导光板及背板装配结构。 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 的技术方案及其他有益效果显而易见。
附图中，
图 1为耦光距离同光效的关系示意图；
图 2为现有技术中的导光板定位结构示意图；
图 3为本发明背光模组耦光设计中导光板入光侧定位方式的示意图； 图 4为本发明背光模组耦光设计中导光板对光侧定位方式一实施方式 的示意图；
图 5 为本发明背光模组耦光设计中导光板对光侧定位方式另一实施方 式的示意图；
图 6及图 7为本发明背光模组耦光设计中垂直于入光方向的装配方式 示意图；
图 8为本发明背光模组耦光设计中散热片及其定位结构示意图。 具体实施方式
参见图 3 , 其为本发明背光模组耦光设计中导光板入光侧定位方式的 示意图。 本发明的背光模组耦光设计包括： 散热片 10、 LED灯条 20、 导 光板 30及背板 40, 该散热片 10位于该导光板 30的入光侧并固定在该背 板 40上， 该 LED灯条 20固定在该散热片 10上并朝向该导光板 30的入 光侧， 该散热片 10上设有朝向该导光板 30的入光侧的凸包 50, 所述凸包 50 的顶部接触该导光板 30 的入光侧以限制该导光板 30在入光方向的位 移， 该导光板 30的对光侧与该背板 40的侧墙之间填充有弹性结构。 凸包 50可以为冲压形成。 LED灯条 20贴附于散热片 10上， 散热片 10上设计 凸包 50, 凸包 50顶部同导光板 30接触， 由于冲压件尺寸稳定， 所以可以 有效控制耦光距离。
参见图 4及图 5 , 图 4 为导光板对光侧定位方式一实施方式的示意 图， 图 5为导光板对光侧定位方式另一实施方式的示意图。 图 4中， 导光 板 3 1的对光侧与背板 41的侧墙之间填充有作为弹性结构的弹簧 61。 图 5 中， 导光板 32的对光侧与背板 42的侧墙之间填充有作为弹性结构的弹性 材料 62 , 弹性材料 62 可以制成弹性垫的形式， 具体可采用橡胶材料。 对 光侧采用弹簧 61或弹性材料 62填充， 可以有效吸收部材公差及膨胀量， 避免 LGP的尺寸变异无法释放导致导光板弯曲。
本发明背光模组耦光设计在背光灯条（Light-Bar ) 的散热片上设计水 平向的定位凸包限制入光侧的导光板的位移， 对光侧用弹簧或弹性材料定 位导光板； 由于钣金冲压具有良好的尺寸工艺性， 凸包高度误差可以控制 在 0.1mm以内 , 所以保证了入光侧可以做到较小耦光距离， 对光侧的弹性 结构可以有效吸收导光板制造公差及受热受潮产生的膨胀量， 避免导光板 尺寸变异时产生翘曲。
参见图 6及图 7 , 其为本发明背光模组耦光设计中垂直于入光方向的 装配方式示意图。 在垂直于入光方向的方向上， 背板 43 的侧墙上设有朝 向导光板 33的一侧的凸台 70以接触该导光板 33 , 在该背板 43的侧墙与 该导光板 33 的另一侧之间填充有緩冲材料 80。 由于此方向不影响耦光距 离， 此方向可以于背板 43侧墙设计凸台 70定位， 导光板 33—侧面同背 板 43 的凸台 70贴齐， 另外一面用緩冲材料 80填充， 从而有效的控制导 光板的位移； 一端采用零间隙装配， 另外一端采用緩冲装配， 避免导光板 33尺寸变异导致翘曲。
参见图 8 , 其为本发明背光模组耦光设计中散热片及其定位结构示意 图。 散热片 1 1上设有螺孔， 该散热片 1 1可以通过螺栓固定至背板上。 散 热片 11 可以在两侧各设一个凸包 51 , 或者也可以选择在适当位置设置适 当数量的凸包。
本发明背光模组耦光设计中的导光板定位方式， 可以将导光板同 LED 之间的距离控制到最小值（0.2毫米） ， 提升光效 3%左右； 同时， 此设计 可以通过控制导光板的位移及减少变异来实现提升耦光距离的稳定性。
综上所述， 本发明背光模组耦光设计的优点是： 1.提升模组耦光效 率； 2.取消背板铆钉及 LGP裁切结构， 简化 LGP及背板装配结构， 实现 部材成本上的优化。
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 都应属于本发明后附的权利要求的保护范围。

Claims

权 利 要 求
1、 一种背光模组耦光设计， 包括： 散热片、 LED 灯条、 导光板及背 板， 该散热片位于该导光板的入光侧并固定在该背板上， 该 LED 灯条固 定在该散热片上并朝向该导光板的入光侧， 该散热片上设有朝向该导光板 的入光侧的凸包， 所述凸包的顶部接触该导光板的入光侧以限制该导光板 在入光方向的位移， 该导光板的对光侧与该背板的侧墙之间填充有弹性结 构。
2、 如权利要求 1 所述的背光模组耦光设计， 其中， 该弹性结构为弹 簧。
3、 如权利要求 1 所述的背光模组耦光设计， 其中， 该弹性结构为弹 性材料。
4、 如权利要求 1 所述的背光模组耦光设计， 其中， 在垂直于入光方 向的方向上， 该背板的侧墙上设有朝向该导光板的一侧的凸台以接触该导 光板， 在该背板的侧墙与该导光板的另一侧之间填充有緩冲材料。
5、 如权利要求求 1 所述的背光模组耦光设计， 其中， 该散热片上设 有螺孔， 该散热片通过螺栓固定至该背板上。
6、 如权利要求求 1 所述的背光模组耦光设计， 其中， 该散热片两侧 各设有一个凸包。
7、 如权利要求求 1 所述的背光模组耦光设计， 其中， 该凸包为冲压 形成。
8、 如权利要求求 1 所述的背光模组耦光设计， 其中， 该凸包的高度 误差控制在 0.1毫米以内。
9、 如权利要求求 1 所述的背光模组耦光设计， 其中， 该导光板同 LED灯条之间的距离为 0.2毫米。
10、 一种背光模组耦光设计， 包括： 散热片、 LED灯条、 导光板及背 板， 该散热片位于该导光板的入光侧并固定在该背板上， 该 LED 灯条固 定在该散热片上并朝向该导光板的入光侧， 该散热片上设有朝向该导光板 的入光侧的凸包， 所述凸包的顶部接触该导光板的入光侧以限制该导光板 在入光方向的位移， 该导光板的对光侧与该背板的侧墙之间填充有弹性结 构；
其中， 该弹性结构为弹簧；
其中， 在垂直于入光方向的方向上， 该背板的侧墙上设有朝向该导光 板的一侧的凸台以接触该导光板， 在该背板的侧墙与该导光板的另一侧之 间填充有緩冲材料；
其中， 该散热片上设有螺孔， 该散热片通过螺栓固定至该背板上； 其中， 该散热片两侧各设有一个凸包；
其中， 该凸包为沖压形成；
其中， 该凸包的高度误差控制在 0.1毫米以内；
其中， 该导光板同 LED灯条之间的距离为 0.2毫米。
PCT/CN2012/084797 2012-10-31 2012-11-19 背光模组耦光设计 Ceased WO2014067182A1 (zh)

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