WO2014008687A1 - Led背光模组 - Google Patents

Led背光模组 Download PDF

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Publication number
WO2014008687A1
WO2014008687A1 PCT/CN2012/079227 CN2012079227W WO2014008687A1 WO 2014008687 A1 WO2014008687 A1 WO 2014008687A1 CN 2012079227 W CN2012079227 W CN 2012079227W WO 2014008687 A1 WO2014008687 A1 WO 2014008687A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
light
led
heat sink
Prior art date
Application number
PCT/CN2012/079227
Other languages
English (en)
French (fr)
Inventor
贺虎
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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 US13/635,422 priority Critical patent/US9164227B2/en
Priority to DE201211006700 priority patent/DE112012006700T5/de
Publication of WO2014008687A1 publication Critical patent/WO2014008687A1/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
    • G02B6/0081—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
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0085—Means for removing heat created by the light source from the package

Definitions

  • the present invention relates to liquid crystal display technology, and more particularly to an LED backlight module. Background technique
  • the existing LED backlight modules used in liquid crystal display technology are mainly divided into a direct type backlight module and a side-entry backlight module.
  • a side-entry LED backlight module As the LED efficiency continues to increase, the design of the LED backlight is also evolving, from the first four sides of the light, to the two sides of the light, to the single side of the light, the current development and future development The direction will point to the single short edge light input mode.
  • the side-in LED backlight is configured by arranging the LED die on the peripheral edge of the liquid crystal panel, and then using the light guide plate to illuminate the LED backlight partition, and passing the light emitted from the edge of the liquid crystal panel through the light guide plate (LGP). It is transported to the center of the LCD panel, so that there is enough backlight in the whole to allow the LCD panel to display the image.
  • Side-effect LED backlights have two advantages: One is to use fewer LED dies, which saves cost; the other is to create a slimmer body, so that there is no need to configure LED modules behind the LCD panel. It is placed on the side to reduce the overall thickness of the LCD panel, and the body can be very thin.
  • the existing side-entry LED backlight module mainly includes a light guide plate 10, an LED light bar 11 , a back plate 12 and a heat sink (13), and the light guide plate 10 is disposed on the back.
  • the heat dissipation member 13 is disposed between the light guide plate 10 and the back plate 12.
  • the LED light bar 11 is disposed as a light source on the side of the light guide plate 10. The heat generated when the LED light bar 11 is in operation can be dissipated through the heat dissipation member 13. .
  • a plastic frame 14 is disposed above the edge of the light guide plate 10, and a reflective plate 15 is disposed below the plastic frame 14.
  • the reflective plate 15 is located above the light incident portion between the LED light bar 11 and the light guide plate 10, so that the LED light bar 11 emits
  • the light enters the light guide plate 10 as much as possible, and the direction of light propagation in the light guide plate 10 is indicated by an arrowed line.
  • the light in the dotted circle indicates that full internal emission has occurred, and the light entering from the side of the light guide plate 10 is utilized by total internal emission. It can be transported along the light guide.
  • the lower surface of the light guide plate 10 is provided with a dot 16 on the upper surface, and the upper surface is provided with an optical film 17, which is used to break the total internal reflection, so that the light is separated from the upper surface of the light guide plate 10, thereby illuminating the liquid crystal panel located above the light guide plate 10. (not shown).
  • the heat sink 13 can generally be made of an aluminum extruded profile, and the backing plate 12 can be an aluminum backing.
  • the distance between the LED and the light guide plate directly affects the efficiency of the LED coupling into the light guide plate. The smaller the distance, the higher the coupling efficiency, that is, the efficiency of the backlight is improved. . Referring to FIG. 2 and FIG.
  • FIG. 3 it is a perspective view of a conventional side-in LED backlight module after removing a light guide plate
  • FIG. 3 is a cross-sectional view of FIG. 2 at a screw position.
  • the LED light bar 21 is fixed on the heat sink 22, and the heat sink 22 is fixed on the back plate 24 by screws 23, and is fixedly fixed to the back plate 24.
  • the position of the screw 23 is shown in the drawing. Line representation.
  • the LED strip 21 is provided with an LED die 211 as a light source, and the back plate 24 is provided with an upwardly extending LGP positioning column 25.
  • FIG. 4 it is a perspective view of the backlight module shown in FIG. 2 after the light guide plate is assembled.
  • the light guide plate 26 is fixed by the light guide plate positioning post 25 on the back plate 24.
  • the light guide plate 26 is provided with a notch corresponding to the light guide plate positioning column 25, and the light guide plate positioning column 25 passes upward through the notch, thereby making the light guide plate 26 fixed.
  • FIG. 5 it is a cross-sectional view of the backlight module shown in FIG. 2 when the light guide plate is inflated.
  • the light guide plate may have a short side contact with the LED light bar 21.
  • an object of the present invention is to provide an LED backlight module that ensures a coupling distance between a light guide plate and an LED while avoiding warpage caused by expansion of the light guide plate.
  • the present invention provides an LED backlight module including a light guide plate, an LED light bar, a back plate, and a heat dissipating member, wherein the LED light bar is fixed on the heat sink member adjacent to the light incident side of the light guide plate.
  • the heat dissipating member is disposed on the heat dissipating member, and the light guide plate is positioned upwardly through the light guide plate to position the light guide plate relative to the heat dissipating member.
  • the heat dissipating member is movable along the light entering direction. Disposed on the backboard, the heat dissipating member is displaced by expanding or contracting with the light guide plate to maintain a coupling distance between the light guide plate and the LED strip.
  • the back plate is provided with a screw hole for disposing a heat dissipating member, and the heat dissipating member is locked to the back plate by the screw through the screw hole, and the screw is locked and vertically in the screw hole It is fixed in the light entering direction and has a certain motion precession along the light entering direction.
  • the back plate is provided with a screw hole for arranging the light guide plate, and the light guide plate positioning column passes through the screw hole and then extends upward through the positioning hole on the heat sink, and the light guide plate is positioned.
  • the column is fixed perpendicular to the light incident direction in the screw hole and has a certain motion precession in the light incident direction.
  • the light guide plate positioning post is integrally disposed on the heat sink.
  • the heat dissipating member includes two supporting walls at right angles to each other, the LED light bar is fixed on the inner side of the first supporting wall, and the light guiding plate positioning column is disposed on the inner side of the second supporting wall, the second The support wall is disposed between the light guide plate and the back plate.
  • the LED backlight module includes a single side light.
  • the LED backlight module includes two LEDs.
  • the backboard is made of an elastic material.
  • the light guide plate is provided with a notch having a shape matching with the position of the light guide plate on the light incident side, and the light guide plate positioning column passes upward through the notch.
  • the present invention also provides an LED backlight module, comprising a light guide plate, an LED light bar, a back plate and a heat sink, wherein the LED light bar is fixed on the heat sink side adjacent to the light incident side of the light guide plate, and the heat sink is disposed on the heat sink And a relatively fixed upwardly extending light guide plate positioning column, wherein the light guide plate positioning column passes upward through the light guide plate to relatively position the light guide plate on the heat sink, and the heat dissipation member is movable on the back plate along the light entering direction.
  • the heat dissipating member is displaced by expanding or contracting with the light guide plate to maintain a coupling distance between the light guide plate and the LED light bar;
  • a screw hole for disposing a heat dissipating member is disposed on the back plate, and the heat dissipating member is locked to the back plate by the screw through the screw hole, and the screw is locked and perpendicular to the screw hole
  • the light direction is fixed and has a certain motion precession along the light entering direction
  • the back plate is provided with a screw hole for arranging the light guide plate, and the light guide plate positioning column passes through the screw hole and then extends upward through the positioning hole on the heat sink, and the light guide plate positioning column is in the
  • the screw hole is fixed perpendicular to the light incident direction and has a certain motion precession along the light incident direction;
  • the light guide plate positioning column is integrally disposed on the heat dissipation member
  • the heat dissipating member includes two supporting walls at right angles to each other, the LED light bar is fixed on the inner side of the first supporting wall, and the light guiding plate positioning column is disposed on the inner side of the second supporting wall, the second supporting wall Provided between the light guide plate and the back plate;
  • the LED backlight module further includes a single side light
  • the backing plate is made of an elastic material
  • the light guide plate is provided with a notch having a shape matching with the position of the light guide plate on the light incident side, and the light guide plate positioning column passes upward through the notch.
  • the LED backlight module of the invention can avoid the warpage caused by the interference of the mechanism after the light guide plate is expanded due to heat or moisture absorption; the LED can be prevented from colliding with the LED after being heated or absorbed by moisture, thereby causing the LED to fail; the light guide plate and the LED can be ensured
  • the coupling distance between the two increases the coupling efficiency.
  • FIG. 1 is a schematic view showing the working principle of a conventional side-entry LED backlight module
  • FIG. 2 is a perspective view of a conventional side-in LED backlight module after removing a light guide plate;
  • FIG. 3 is a cross-sectional view of FIG. 2 at a screw position;
  • FIG. 4 is a perspective view of the backlight module of FIG. 2 assembled with a light guide plate;
  • Figure 5 is a cross-sectional view of the backlight module of Figure 2 when the light guide plate is inflated;
  • FIG. 6 is a perspective view of a back plate of a preferred embodiment of the LED backlight module of the present invention
  • FIG. 7 is a plan view of the back plate of FIG.
  • FIG. 8 is a perspective view of a preferred embodiment of the LED backlight module of the present invention with the light guide plate removed;
  • FIG. 9 is a top view of a light guide plate according to a preferred embodiment of the LED backlight module of the present invention.
  • FIG. 10 is a schematic view showing the assembly of a preferred embodiment of the LED backlight module of the present invention.
  • FIG. 11 is a schematic view showing the working principle of the LED backlight module of the present invention, wherein the light guide plate is in an expanded state;
  • Figure 12 is a cross-sectional view of Figure 11;
  • FIG. 13 is a schematic view showing the working principle of the LED backlight module of the present invention, wherein the light guide plate is in a contracted state;
  • Figure 14 is a cross-sectional view of Figure 13 . detailed description
  • FIG. 6 is a perspective view of a backplane of a preferred embodiment of the LED backlight module of the present invention
  • FIG. 7 is a top view of the backplane of FIG.
  • FIG. 9 is a top view of a light guide plate according to a preferred embodiment of the LED backlight module of the present invention
  • FIG. 10 is a schematic view showing the assembly of a preferred embodiment of the LED backlight module of the present invention.
  • the LED backlight module of the present invention mainly comprises a light guide plate 30, an LED light bar 31, a back plate 32 and a heat sink 33.
  • the LED light bar 31 is fixed on the heat sink 33 adjacent to the light incident side of the light guide plate 30, and the heat sink 33 is mounted on the heat sink 33.
  • An upwardly extending light guide plate positioning post 34 is disposed, and the light guide plate positioning post 34 passes upwardly through the light guide plate 30 to position the light guide plate 30 relative to the heat sink 33.
  • the heat sink member 33 is movable along the light entering direction. On the back plate 32, the heat sink 33 is displaced by expansion or contraction with the light guide plate 30 to maintain the coupling distance between the light guide plate 30 and the LED strip 31.
  • the back plate 32 is provided with a screw hole 321 for arranging the heat dissipating member 33.
  • the heat dissipating member 33 can be locked to the back plate 32 through the screw hole 321 by the screw 331.
  • the screw hole 321 is a groove-shaped groove, and the screw 331
  • the screw hole 321 is fixed in the Y direction perpendicular to the light incident direction, and has a certain motion advance in the X direction along the light incident direction.
  • the back plate 32 may further be provided with a screw hole 322 for arranging the light guide plate positioning post 34.
  • the light guide plate positioning post 34 extends through the screw hole 322 and then extends upward through the positioning hole on the heat sink 33.
  • the light guide plate positioning column 34 is The screw hole 322 is fixed in the Y direction perpendicular to the light incident direction and has a certain motion advance in the X direction along the light incident direction.
  • the screw holes 321 and 322 and the light guide plate positioning post 34 are fixed relative to the heat dissipating member 33, and each of the upper side and the lower side has a light guide plate positioning post 34.
  • the number of screw holes on the back plate 32 can be any number.
  • the light guide plate positioning post 34 may also be integrally disposed on the heat sink 33, and the light guide plate positioning post 34 extends directly from the heat sink 33.
  • the light guide plate positioning column 34 may be any one.
  • the heat dissipating member 33 includes two supporting walls 332 and 333 at right angles to each other, so that the heat dissipating member interface is L-shaped, the LED light bar 31 is fixed on the inner side of the first supporting wall 332, and the light guide plate positioning post 34 is disposed on the second supporting wall.
  • the second support wall 333 is disposed between the light guide plate 30 and the back plate 32.
  • the light-incident mode of the LED backlight module of the present invention may be single-side light input or multi-side light input.
  • the LED backlight module of the present invention may comprise an LED strip, which is now a single side light.
  • the LED backlight module of the present invention may also include two LED strips, which are double-sided light entering the two sides.
  • the backing plate 32 is preferably made of an elastic material.
  • the shape of the light guide plate 30 may be a rectangle, and the positioning shape of the light guide plate 30 on the light incident side is matched with the position of the light guide plate positioning column 34.
  • the light guide plate 30 is provided with a notch 301 having a shape matching with the light guide plate positioning post 34 on the light incident side, and the light guide plate positioning post 34 passes upward through the notch 301.
  • FIG. 11 is a schematic view showing the working principle of the LED backlight module of the present invention, wherein the light guide plate is in an expanded state
  • FIG. 12 is a cross-sectional view of FIG.
  • the light guide plate positioning post 44 of the light guide plate 40 and the heat sink 43 are relatively fixed, and the heat sink 43 and the back plate 42 are movable, and the heat sink 43 is associated with the light guide plate 40.
  • the expansion or contraction is displaced, and the coupling distance between the light guide plate 40 and the LED strip 41 is maintained.
  • the light guide plate 40 When the light guide plate 40 is inflated, the light guide plate 40 will give the light guide plate positioning rod 44 a force F due to the interference of the light guide plate positioning column 44. Since the light guide plate positioning column 44 and the heat sink member 43 are relatively fixed, the force acts on the heat sink member. At 43, the heat sink 43 can be moved in the expansion direction S of the light guide plate 40.
  • FIG. 13 is a schematic diagram showing the working principle of the LED backlight module of the present invention, wherein the light guide plate is in a contracted state
  • FIG. 14 is a cross-sectional view of FIG.
  • the light guide plate 40 When the light guide plate 40 is cooled and contracted, the light guide plate 40 will give the light guide plate positioning column 44 a force F due to the interference of the light guide plate positioning column 44. Since the light guide plate positioning column 44 and the heat sink 43 are relatively fixed, the force acts on On the heat sink 43, the heat sink 43 can be moved toward the contraction direction S' of the light guide plate 40.
  • the LED backlight module of the present invention can ensure the coupling distance between the light guide plate and the LED, and improve the efficiency of the backlight; in the high temperature and high humidity environment, the heat sink can be made when the light guide plate expands (together with the LED light bar) Displacement occurs, avoiding warpage of the light guide plate due to interference between the two sides, improving the quality; when the temperature and humidity are lowered, after the light guide plate is contracted, the heat sink (along with the LED light bar) occurs due to the elastic material at the edge of the back plate Displacement, ensuring the coupling distance between the light guide and the LED strip.

Abstract

一种LED背光模组，包括导光板（30）、LED灯条（31）、背板（32）及散热件（33），所述LED灯条（31）邻近导光板（30）的入光侧边固定在散热件（33）上，所述散热件（33）上设有与其相对固定的向上延伸的导光板定位柱（34），所述导光板定位柱（34）向上穿过导光板（30）使导光板（30）相对定位在散热件（33）上，所述散热件（33）沿入光方向可活动的设置在背板（32）上，所述散热件（33）通过随导光板（30）膨胀或收缩发生位移以保持导光板（30）与LED灯条（31）之间的耦光距离。所述LED背光模组可以避免导光板（30）因受热或吸湿膨胀后由于机构干涉造成的翘曲，可以避免导光板（30）因受热或吸湿膨胀后碰撞LED，造成LED故障，还可以保证导光板（30）与LED之间的耦光距离，提升耦光效率。

Description

LED背光模组 技术领域
本发明涉及液晶显示技术， 尤其涉及一种 LED背光模组。 背景技术
现有的用于液晶显示技术中的 LED 背光模组主要分为直下式背光模 组及侧入式背光模组。 对于侧入式 LED背光模组， 随着 LED效率的不断 提升， LED 背光的设计也不断演进， 从最初的四侧入光， 到双侧入光， 到 单侧入光， 目前开发及未来发展的方向都将指向单短边入光方式。
侧入式 LED背光， 是把 LED晶粒配置在液晶面板的四周边缘， 再搭 配导光板， 让 LED 背光分区点亮时， 把从液晶面板边缘发射的光通过导 光板（Light guide Plate, LGP )输送到液晶面板中央的区域去， 这样整体 就有足够的背光量， 可让液晶面板显示画面。 侧入式 LED 背光的好处有 两个： 其一是可使用较少颗的 LED 晶粒， 节省成本； 其二就是能够打造 比较轻薄的机身， 让液晶面板的后方不需要配置 LED模块， 而是放置在 侧边， 可减少液晶面板整体的厚度， 机身能很薄。
参见图 1 , 其为现有侧入式 LED背光模组的工作原理示意图。 以单侧 入光为例， 现有的侧入式 LED 背光模组主要包括导光板 10、 LED 灯条 ( LED Lightbar ) 11、 背板 12和散热件 ( Heatsink ) 13 , 导光板 10设置在 背板 12上， 散热件 13设置在导光板 10和背板 12之间， LED灯条 11作 为光源设置在导光板 10的侧边， LED灯条 11工作时所产生的热量可通过 散热件 13散发。 导光板 10边缘处上方设置有胶框 14, 胶框 14下方设置 有反射板 15, 反射板 15位于 LED灯条 11与导光板 10之间的入光处的上 方， 使 LED灯条 11发出的光线尽量进入导光板 10中， 光线在导光板 10 中的传播方向以带箭头的线条表示， 虚线圓圈中的光线表示发生了全内发 射， 利用全内发射， 从导光板 10 —侧进入的光线可以沿导光板传输。 导 光板 10下表面设有网点 16, 上表面设有光学膜 17, 利用网点 16来破坏 全内反射， 使光线从导光板 10 的上表面脱出， 进而可以照亮位于导光板 10上方的液晶面板（图未示） 。 散热件 13 —般可釆用铝挤型材， 背板 12 可以为铝背板。 在侧入式背光模组中， LED与导光板之间的距离， 直接影 响 LED 耦合到导光板中的效率， 该距离越小， 耦光效率 （ Coupling efficiency )越高， 即背光的效率得到提升。 参见图 2及图 3 , 其为现有侧入式 LED背光模组除去导光板后的立体 示意图， 图 3为图 2在螺丝位置处的剖视图。 通常 LED 灯条 21是固定在 散热件 22上， 散热件 22通过螺丝 23 固定在背板 24上， 与背板 24位置 相对固定， 为使视图简洁， 附图中仅对螺丝 23 所在位置处以剖面线表 示。 LED 灯条 21上设有 LED晶粒 211作为光源， 背板 24上设有向上延 伸的导光板定位柱 ( LGP positioning column ) 25。
如图 4所示， 其为图 2所示的背光模组组装导光板后的立体示意图。 导光板 26是由背板 24上的导光板定位柱 25来进行固定的， 导光板 26上 设有与导光板定位柱 25对应的缺口， 导光板定位柱 25向上穿过缺口， 从 而使导光板 26固定。
如图 5所示， 其为图 2所示的背光模组当导光板膨胀时的剖示图。 当 背光模组工作的环境发生变化时， 尤其是导光板 26 受热膨胀或者吸湿膨 胀时， 导光板会存在与 LED灯条 21短边发生接触的可能。 这样的变异会 有两方面的风险： ① LED 的信赖性风险， LED 会出现被导光板撞坏的情 况； ②导光板因为由导光板定位柱固定， 无法在长度方向延伸， 从而引发 竖直面的翘曲 （waving ) 。
现有技术中为了避免发生导光板因为受热膨胀或者吸湿膨胀造成的导 光板翘曲， 需要给导光板留足够的活动预度， 使得导光板与 LED之间的 距离变大， 这样耦光距离会降低， 大大影响背光的效率。 发明内容
因此， 本发明的目的在于提供一种 LED 背光模组， 保证导光板与 LED之间的耦光距离， 同时避免导光板膨胀产生的翘曲。
为实现上述目的， 本发明提供一种 LED 背光模组， 其包括导光板、 LED 灯条、 背板及散热件， 所述 LED 灯条邻近导光板的入光侧边固定在 散热件上 , 所述散热件上设有与其相对固定的向上延伸的导光板定位柱 , 所述导光板定位柱向上穿过导光板使导光板相对定位在散热件上， 所述散 热件沿入光方向可活动的设置在背板上， 所述散热件通过随导光板膨胀或 收缩发生位移以保持导光板与 LED灯条之间的耦光距离。
其中， 所述背板上设有用于设置散热件的螺孔， 所述散热件借由螺丝 穿过所述螺孔锁附至背板上， 所述螺丝锁附后在所述螺孔中垂直于入光方 向固定且沿入光方向具有一定活动预度。
其中， 所述背板上设有用于设置导光板定位柱的螺孔， 所述导光板定 位柱穿过所述螺孔后再穿过散热件上的定位孔向上延伸， 所述导光板定位 柱在所述螺孔中垂直于入光方向固定且沿入光方向具有一定活动预度。 其中， 所述导光板定位柱一体设置于散热件上。
其中， 所述散热件包括相互之间呈直角的两支撑壁， 所述 LED 灯条 固定在第一支撑壁内侧上， 所述导光板定位柱设置在第二支撑壁内侧上， 所述第二支撑壁设置于导光板及背板之间。
其中， 包括一 LED灯条， 所述 LED背光模组为单侧入光。
其中， 包括两 LED灯条， 所述 LED背光模组为双侧入光。
其中， 所述背板由弹性材料制成。
其中， 所述导光板在入光侧设有形状与导光板定位柱匹配的缺口， 所 述导光板定位柱向上穿过所述缺口。
本发明还提供一种 LED 背光模组， 包括导光板、 LED 灯条、 背板及 散热件， 所述 LED 灯条邻近导光板的入光侧边固定在散热件上， 所述散 热件上设有与其相对固定的向上延伸的导光板定位柱， 所述导光板定位柱 向上穿过导光板使导光板相对定位在散热件上， 所述散热件沿入光方向可 活动的设置在背板上， 所述散热件通过随导光板膨胀或收缩发生位移以保 持导光板与 LED灯条之间的耦光距离；
所述背板上设有用于设置散热件的螺孔， 所述散热件借由螺丝穿过所 述螺孔锁附至背板上， 所述螺丝锁附后在所述螺孔中垂直于入光方向固定 且沿入光方向具有一定活动预度；
所述背板上设有用于设置导光板定位柱的螺孔， 所述导光板定位柱穿 过所述螺孔后再穿过散热件上的定位孔向上延伸， 所述导光板定位柱在所 述螺孔中垂直于入光方向固定且沿入光方向具有一定活动预度；
所述导光板定位柱一体设置于散热件上；
所述散热件包括相互之间呈直角的两支撑壁， 所述 LED 灯条固定在 第一支撑壁内侧上， 所述导光板定位柱设置在第二支撑壁内侧上， 所述第 二支撑壁设置于导光板及背板之间；
还包括一 LED灯条， 所述 LED背光模组为单侧入光；
所述背板由弹性材料制成；
所述导光板在入光侧设有形状与导光板定位柱匹配的缺口， 所述导光 板定位柱向上穿过所述缺口。
本发明的 LED 背光模组可以避免导光板因受热或吸湿膨胀后由于机 构干涉造成的翘曲； 可以避免导光板因受热或吸湿膨胀后碰撞 LED, 造成 LED的失效； 可以保证导光板与 LED之间的耦光距离， 提升耦光效率。 附图说明
图 1为现有侧入式 LED背光模组的工作原理示意图；
图 2为现有侧入式 LED背光模组除去导光板后的立体示意图； 图 3为图 2在螺丝位置处的剖视图；
图 4为图 2所示背光模组组装导光板后的立体示意图；
图 5为图 2所示背光模组当导光板膨胀时的剖视图；
图 6为本发明 LED背光模组一较佳实施例的背板的立体示意图； 图 7为图 6中背板的俯视图；
图 8 为本发明 LED 背光模组一较佳实施例除去导光板后的立体示意 图；
图 9为本发明 LED背光模组一较佳实施例的导光板的俯视图； 图 10为本发明 LED背光模组一较佳实施例的组装示意图；
图 11为本发明 LED背光模组的工作原理示意图， 其中导光板处于膨 胀状态；
图 12为图 11的剖视图；
图 13为本发明 LED背光模组的工作原理示意图， 其中导光板处于收 缩状态；
图 14为图 13的剖视图。 具体实施方式
参见图 6至图 10, 图 6为本发明 LED背光模组一较佳实施例的背板 的立体示意图； 图 7为图 6中背板的俯视图； 图 8为本发明 LED背光模 组一较佳实施例除去导光板后的立体示意图； 图 9 为本发明 LED 背光模 组一较佳实施例的导光板的俯视图； 图 10为本发明 LED背光模组一较佳 实施例的组装示意图。
本发明的 LED背光模组主要包括导光板 30、 LED灯条 31、 背板 32 及散热件 33 , LED灯条 31邻近导光板 30的入光侧边固定在散热件 33 上， 散热件 33 上设有与其相对固定的向上延伸的导光板定位柱 34, 导光 板定位柱 34向上穿过导光板 30使导光板 30相对定位在散热件 33上， 散 热件 33 沿入光方向可活动的设置在背板 32上， 散热件 33通过随导光板 30膨胀或收缩发生位移以保持导光板 30 与 LED 灯条 31 之间的耦光距 离。
背板 32上设有用于设置散热件 33的螺孔 321 , 散热件 33可以借由螺 丝 331通过螺孔 321锁附至背板 32上， 螺孔 321为一字形凹槽， 螺丝 331 在螺孔 321 中垂直于入光方向的 Y方向固定， 沿入光方向的 X方向具有 一定活动预度。 背板 32 上还可以设有用于设置导光板定位柱 34 的螺孔 322, 导光板定位柱 34穿过螺孔 322后再穿过散热件 33上的定位孔向上 延伸， 导光板定位柱 34在螺孔 322中垂直于入光方向的 Y方向固定且沿 入光方向的 X 方向具有一定活动预度。 在此较佳实施例中， 螺孔 321、 322和导光板定位柱 34与散热件 33相对固定， 上侧和下侧各有一个导光 板定位柱 34。
本发明的 LED背光模组中， 背板 32上的螺孔数量可以为任意个。 而 且， 导光板定位柱 34也可以选择为一体设置于散热件 33上， 导光板定位 柱 34直接自散热件 33向上延伸。 导光板定位柱 34也可以为任意个。
散热件 33包括相互之间呈直角的两支撑壁 332和 333 , 从而散热件界 面呈 L形， LED灯条 31 固定在第一支撑壁 332内侧上， 导光板定位柱 34 设置在第二支撑壁 333 内侧上， 第二支撑壁 333设置于导光板 30及背板 32之间。
本发明 LED 背光模组的入光方式可以为单侧入光， 也可以是多侧入 光。 本发明的 LED背光模组可以包括一 LED灯条， 此时其为单侧入光。 本发明的 LED背光模组也可以包括两 LED灯条， 此时其为两对边的双侧 入光。 背板 32优选釆用弹性材料制成。 导光板 30形状可以为矩形， 主要 是导光板 30入光侧定位形状与导光板定位柱 34需要匹配。 此较佳实施例 中， 导光板 30在入光侧设有形状与导光板定位柱 34 匹配的缺口 301 , 导 光板定位柱 34向上穿过缺口 301。
参见图 11 及图 12, 图 11 为本发明 LED 背光模组的工作原理示意 图， 其中导光板处于膨胀状态， 图 12为图 11 的剖视图。 本发明的侧边式 LED 背光模组， 其中导光板 40 的导光板定位柱 44 与散热件 43 相对固 定， 而散热件 43与背板 42之间可活动， 散热件 43会随着导光板 40膨胀 或收缩发生位移， 保持导光板 40与 LED灯条 41之间的耦光距离。 当导 光板 40膨胀时， 由于导光板定位柱 44的干涉作用， 导光板 40会给导光 板定位柱 44一个力 F, 由于导光板定位柱 44与散热件 43相对固定， 此力 作用在散热件 43上， 可使散热件 43沿导光板 40膨胀方向 S移动。
参见图 13 及图 14 , 图 13 为本发明 LED 背光模组的工作原理示意 图， 其中导光板处于收缩状态， 图 14为图 13 的剖视图。 当导光板 40冷 却收缩时， 由于导光板定位柱 44的干涉作用， 导光板 40会给导光板定位 柱 44一个力 F，， 由于导光板定位柱 44与散热件 43相对固定， 此力作用 在散热件 43上， 可使散热件 43朝导光板 40收缩方向 S'移动。 综上所述， 本发明的 LED背光模组可以保证导光板与 LED之间的耦 光距离， 提升背光的效率； 在高温高湿环境中， 导光板膨胀时可以使散热 件 （连同 LED 灯条）发生位移， 避免导光板由于两边的干涉产生翘曲， 改善品质不良； 当温度和湿度降低时， 导光板收缩后， 由于背板边缘的弹 性材料作用， 使散热件（连同 LED 灯条）发生位移， 保证导光板与 LED 灯条之间的耦光距离。
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 LED背光模组， 包括导光板、 LED灯条、 背板及散热件， 所 述 LED 灯条邻近导光板的入光侧边固定在散热件上， 所述散热件上设有 与其相对固定的向上延伸的导光板定位柱， 所述导光板定位柱向上穿过导 光板使导光板相对定位在散热件上， 所述散热件沿入光方向可活动的设置 在背板上， 所述散热件通过随导光板膨胀或收缩发生位移以保持导光板与 LED灯条之间的耦光距离。
2、 如权利要求 1所述的 LED背光模组， 其中， 所述背板上设有用于 设置散热件的螺孔， 所述散热件借由螺丝穿过所述螺孔锁附至背板上， 所 述螺丝锁附后在所述螺孔中垂直于入光方向固定且沿入光方向具有一定活 动预度。
3、 如权利要求 1所述的 LED背光模组， 其中， 所述背板上设有用于 设置导光板定位柱的螺孔 , 所述导光板定位柱穿过所述螺孔后再穿过散热 件上的定位孔向上延伸， 所述导光板定位柱在所述螺孔中垂直于入光方向 固定且沿入光方向具有一定活动预度。
4、 如权利要求 1所述的 LED背光模组， 其中， 所述导光板定位柱一 体设置于散热件上。
5、 如权利要求 1所述的 LED背光模组， 其中， 所述散热件包括相互 之间呈直角的两支撑壁， 所述 LED 灯条固定在第一支撑壁内侧上， 所述 导光板定位柱设置在第二支撑壁内侧上， 所述第二支撑壁设置于导光板及 背板之间。
6、 如权利要求 1 所述的 LED背光模组， 还包括一 LED灯条， 所述 LED背光模组为单侧入光。
7、 如权利要求 1 所述的 LED背光模组， 还包括两 LED灯条， 所述 LED背光模组为双侧入光。
8、 如权利要求 1所述的 LED背光模组， 其中， 所述背板由弹性材料 制成。
9、 如权利要求 1所述的 LED背光模组， 其中， 所述导光板在入光侧 设有形状与导光板定位柱匹配的缺口， 所述导光板定位柱向上穿过所述缺 口。
10、 一种 LED 背光模组， 包括导光板、 LED 灯条、 背板及散热件， 所述 LED 灯条邻近导光板的入光侧边固定在散热件上， 所述散热件上设 有与其相对固定的向上延伸的导光板定位柱， 所述导光板定位柱向上穿过 导光板使导光板相对定位在散热件上， 所述散热件沿入光方向可活动的设 置在背板上， 所述散热件通过随导光板膨胀或收缩发生位移以保持导光板 与 LED灯条之间的耦光 _5巨离；
所述背板上设有用于设置散热件的螺孔， 所述散热件借由螺丝穿过所 述螺孔锁附至背板上， 所述螺丝锁附后在所述螺孔中垂直于入光方向固定 且沿入光方向具有一定活动预度；
所述背板上设有用于设置导光板定位柱的螺孔， 所述导光板定位柱穿 过所述螺孔后再穿过散热件上的定位孔向上延伸， 所述导光板定位柱在所 述螺孔中垂直于入光方向固定且沿入光方向具有一定活动预度；
所述导光板定位柱一体设置于散热件上；
所述散热件包括相互之间呈直角的两支撑壁， 所述 LED 灯条固定在 第一支撑壁内侧上， 所述导光板定位柱设置在第二支撑壁内侧上， 所述第 二支撑壁设置于导光板及背板之间；
还包括一 LED灯条， 所述 LED背光模组为单侧入光；
所述背板由弹性材料制成；
所述导光板在入光侧设有形状与导光板定位柱匹配的缺口， 所述导光 板定位柱向上穿过所述缺口。
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