WO2015024364A1 - 背光模组及包括该背光模组的显示装置 - Google Patents

背光模组及包括该背光模组的显示装置 Download PDF

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Publication number
WO2015024364A1
WO2015024364A1 PCT/CN2014/070210 CN2014070210W WO2015024364A1 WO 2015024364 A1 WO2015024364 A1 WO 2015024364A1 CN 2014070210 W CN2014070210 W CN 2014070210W WO 2015024364 A1 WO2015024364 A1 WO 2015024364A1
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WIPO (PCT)
Prior art keywords
backlight module
circuit board
printed circuit
total reflection
reflective sheet
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PCT/CN2014/070210
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English (en)
French (fr)
Inventor
罗在力
吴盛圣
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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    • 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
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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

Definitions

  • the present invention relates to the field of backlight technology and liquid crystal display technology, and in particular to a backlight module and a display device including the same.
  • the liquid crystal display device has many advantages such as thin body, power saving, low radiation, and the like, 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.
  • the liquid crystal molecules are redirected 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 is required to display the image normally. Therefore, the backlight module is one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in type backlight module and a direct-type backlight module according to different incident positions of the light source.
  • the direct type backlight module is a light source such as CCFL (Cold) Cathode Fluorescent Lamp, or LED (Light Emitting Diode) It is disposed under the liquid crystal panel and directly forms a surface light source to be provided to the liquid crystal panel.
  • the side-in backlight module is disposed on the edge of the back panel below the side of the liquid crystal panel. The light emitted by the LED strip enters the light guide plate from the light incident surface of the light guide plate, and after being reflected and diffused. The light-emitting surface of the light guide plate is emitted, and then combined by the optical film to form a surface light source to be supplied to the liquid crystal panel.
  • the thinning of the LED backlight module and the narrowing of the frame usually depend on the way the LED is emitted and the thickness of the light guide.
  • LEDs are mainly divided into two categories: Top-view (top illuminating) and Side-view (side illuminating).
  • Top-view top illuminating
  • Side-view side illuminating
  • most of the side-lit backlight modules achieve uniformity of light by matching a 2mm or 3mm light guide plate with a top-emitting LED. Since the existing side-entry backlight module needs to be provided with LED strips on the side of the light guide plate, the LED strips occupy a certain amount.
  • the thickness of the frame makes the frame of the side-lit backlight module wider, and the thickness of the light guide plate is thicker, which becomes a bottleneck of the narrow frame and thinning of the backlight module.
  • the main purpose of the present invention is to provide a backlight module using a side-emitting LED lamp as a backlight and a display device including the same, which aims to realize a thinner thickness and a narrower backlight module and the display device. frame.
  • the present invention provides a backlight module including a printed circuit board, a plurality of LED lamps fixed on the printed circuit board, a reflective sheet disposed on the printed circuit board, and the reflective sheet having the LED light
  • the matching light hole further includes a total reflection colloid covering the reflective sheet and the LED lamp, wherein the LED lamp is a side-emitting LED lamp, and the total reflection colloid corresponds to the LED lamp
  • the LED lamp is matched with a light groove, and a side of the reflection sheet contacting the total reflection colloid is provided with a scattering mesh point.
  • the backlight module further includes a side frame opposite to the two sides of the reflective sheet, the side frame is located above the printed circuit board and abuts the surface of the printed circuit board, and the reflective sheet covers The surface of the printed circuit board and the side of the side frame enclose a cavity through which the total reflection colloid is formed by dispensing, spraying or filling.
  • the backlight module further includes a side frame opposite to the two sides of the reflective sheet, the side frame is located above the printed circuit board and abuts the surface of the printed circuit board, and the reflective sheet only Covering the surface of the printed circuit board, the total reflection colloid is formed by dispensing, spraying or filling processes in a cavity surrounded by the side frame and the reflective sheet.
  • the total reflection colloid has a refractive index of 1.45 or more and 1.55 or less.
  • the total reflection colloid has a thickness of from 0.5 mm to 1.5 mm.
  • the total reflection colloid is a transparent silica gel or an epoxy resin.
  • the scattering dots are printed or sprayed onto the reflective sheet.
  • the scattering mesh point of the reflective sheet adjacent to the LED lamp has a small diameter or a low density, and the scattering mesh point away from the LED lamp has a large diameter or a high density.
  • a backing plate and an optical film are further included, the printed circuit board is mounted on the backing plate, and the optical film is disposed on the total reflection colloid.
  • the invention also provides a display device comprising a liquid crystal panel and a backlight module, wherein the backlight module is a backlight module as described above.
  • the backlight module and the display device of the invention can be formed by a process such as dispensing, spraying or filling.
  • the thickness of the colloid can be controlled, and only needs to cover the height of the LED lamp.
  • the thickness of the total reflection colloid is about 0.5. Mm-1.5mm, compared with the existing light guide plate, the thickness is smaller, the thickness of the entire backlight module is reduced, and the backlight module is thinned; in addition, the LED light is not disposed on the side frame, but is set in the total reflection Below the gel, the border of the backlight module is narrower.
  • FIG. 1 is a schematic structural view of a preferred embodiment of a backlight module of the present invention
  • FIG. 2 is a schematic view showing the distribution of LED lamps on a printed circuit board in a preferred embodiment of the backlight module of the present invention
  • FIG 3 is a schematic structural view of a reflective sheet in a preferred embodiment of the backlight module of the present invention.
  • FIG. 1 is a schematic structural view of a backlight module according to a preferred embodiment of the present invention
  • FIG. 2 is a schematic view showing the distribution of LED lamps on a printed circuit board according to a preferred embodiment of the backlight module of the present invention
  • 3 is a schematic structural view of a reflective sheet in a preferred embodiment of the backlight module of the present invention.
  • the backlight module mentioned in this embodiment includes a printed circuit board 10, a plurality of LED lamps 30 fixed on the printed circuit board 10, a reflective sheet 40 disposed on the printed circuit board 10, and a reflective light on the reflective sheet 40. 30 matched lamp holes 41.
  • the backlight module further includes a total reflection colloid 50 covering the reflective sheet 40 and the LED lamp 30.
  • the total reflection colloid 50 has a refractive index of 1.45 or more and 1.55 or less.
  • the LED lamp 30 is a side-emitting LED lamp 30.
  • the total reflection colloid 50 is provided with a lamp slot (not labeled) corresponding to the LED lamp 30 corresponding to the LED lamp 30, and the surface of the reflective sheet 40 that is in contact with the total reflection colloid 50 (ie, the top surface) There are scattering dots (not shown).
  • the backlight module further includes a side frame 20 opposite to the two sides of the reflective sheet 40. The side frame 20 is located above the printed circuit board 10 and abuts against the surface of the printed circuit board 10.
  • the reflective sheet 40 covers the surface of the printed circuit board 10 and the side surface of the side frame 20, so that the light incident on the side surface of the side frame 20 is reflected and reused, thereby improving the overall backlight efficacy; in other embodiments
  • the reflection sheet 40 may cover only the surface of the printed circuit board 10.
  • the side-illuminated LED lamp 30 is an LED lamp 30 that emits light from the side.
  • the total reflection colloid 50 is a transparent silica gel or an epoxy resin.
  • the total reflection colloid 50 can also be other organic glue or inorganic glue, as long as the refractive index of the total reflection colloid 50 is 1.45 or more and 1.55 or less, thereby achieving total reflection of light.
  • the reflective sheet 40 since the reflective sheet 40 covers the surface of the printed circuit board 10 and the side surface of the side frame 20, the reflective sheet 40 encloses a cavity, and the total reflection colloid 50 is dispensed and sprayed in the cavity. Or a process such as filling is formed, so that there is no air layer between the reflective sheet 40 and the total reflection colloid 50, which reduces the kind of reflected light entering and leaving the medium, reduces the Fresnel interface loss of the light on the medium surface, and improves the backlight. The light effect.
  • the total reflection colloid is formed by a process such as dispensing, spraying or filling in a cavity surrounded by the side frame 20 and the reflective sheet 40.
  • the backlight module of the embodiment adopts the side-emitting LED lamp 30 as a backlight.
  • the LED lamp 30 is located in the lamp slot of the total reflection colloid 50, and the light emitted from the side of the LED lamp 30 enters the total reflection colloid 50.
  • the total reflection colloid 50 is always subjected to total reflection propagation until the light is reflected on the reflection sheet 40, and the scattering dots on the reflection sheet 40 are scattered to destroy the total reflection of the light, and then the light is guided out of the total reflection colloid 50 to form a surface. light source.
  • the total reflection colloid 50 of the present invention can be formed by a process such as dispensing, spraying or filling, and the thickness of the colloid can be controlled, and only needs to cover the height of the LED lamp 30, the thickness of the total reflection colloid 50. It is about 0.5mm-1.5mm. Compared with the existing light guide plate, the thickness is smaller, and the thickness of the entire backlight module is reduced, thereby realizing the thinning of the backlight module.
  • the LED lamp 30 is not disposed on the side frame 20, but is disposed below the total reflection colloid 50, so that the frame of the backlight module is narrower.
  • the scattering dots on the reflective sheet 40 are printed or sprayed on the reflective sheet 40.
  • the diameter of the scattering dots near the LED lamp 30 is small or low, and the diameter of the scattering dots away from the LED lamp 30 is large or high.
  • the scattering dots can be circular or triangular or other polygons.
  • the reflective sheet 40 and the printed circuit board 10 are pasted by a backing. Of course, the reflective sheet 40 and the printed circuit board 10 can be fixed by other means.
  • the LED lamps 30 are staggered and arranged on the printed circuit board 10.
  • the LED lamps 30 are arranged in a staggered arrangement, so that the light of the backlight module is more uniform and the brightness of the backlight is uniform.
  • the LED lamps 30 of the present embodiment may be connected in series or in parallel, or may be connected in series and in parallel.
  • the printed circuit board 10 of this embodiment may be an integral circuit board structure, or may be a combination of a plurality of circuit boards.
  • the reflection sheet 40 of the present embodiment is a silver reflection sheet 40 or a silver plated reflection sheet 40.
  • the silver reflection sheet 40 has a high reflectance and a better reflection effect, and ensures the light effect of the backlight.
  • the backlight module of the embodiment further includes a back plate 60 and an optical film 70.
  • the printed circuit board 10 is mounted on the back plate 60, and the optical film 70 is disposed on the total reflection colloid 50.
  • the printed circuit board 10 can be fixed to the back plate 60 by the heat-conductive double-sided tape, and the heat generated by the LED lamp 30 is transmitted to the back plate 60 through the heat-conductive double-sided tape.
  • the present invention also provides a display device, which includes a liquid crystal panel and a backlight module.
  • the backlight module can include all the technical solutions in the foregoing embodiments shown in FIG. 1 to FIG. 3, and the specific structure can refer to the foregoing embodiment. Make a statement. Due to the adoption of the foregoing backlight module, the display device of the present invention has a thinner thickness and a narrower frame than the conventional display device.

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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

提供了一种背光模组，背光模组包括印刷电路板（10），固定在印刷电路板（10）上的多个LED灯（30），设于印刷电路板（10）上的反射片（40），反射片（40）上具有与LED灯（30）相配合的灯孔（41），还包括覆盖于反射片（40）及LED灯（30）上的全反射胶体（50），LED灯（30）为侧发光式LED灯（30），全反射胶体（50）对应LED灯（30）设有与LED灯（30）相配合的灯槽，反射片（40）与全反射胶体（50）接触的一面上设有散射网点。全反射胶体（50）可以通过点胶、喷涂或者灌装等工艺形成，全反射胶体（50）的厚度是可以控制的，只需要覆盖LED灯（30）的高度即可，相比现有的导光板，厚度更小，整个背光模组厚度降低，实现了背光模组的薄型化；另外，LED灯（30）不设置在边框架（20）上，使得背光模组的边框更窄。还提供了一种背光模组的显示装置。

Description

背光模组及包括该背光模组的显示装置
技术领域
　　　本发明涉及到背光技术领域和液晶显示技术领域，特别涉及到一种背光模组及包括该背光模组的显示装置。　　　
背景技术
　　　液晶显示装置具有机身薄、省电、低辐射等众多优点，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。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。直下式背光模组是将发光光源例如CCFL(Cold Cathode Fluorescent Lamp，冷阴极灯管)或LED(Light Emitting Diode，发光二极管 ) 设置在液晶面板下方，直接形成面光源提供给液晶面板。而侧入式背光模组是将背光源LED灯条设于液晶面板侧下方的背板边缘，LED灯条所发出的光线从导光板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，再经由光学膜片组合以形成面光源提供给液晶面板。
　　　LED背光模组薄型化与边框窄型化通常取决于LED的出光方式和导光板的厚度。LED主要分为两大类Top-view(顶发光)，Side-view(侧发光)。当前大多侧入式背光模组通过顶发光式LED匹配2mm或者3mm导光板实现光均匀化，由于现有的侧入式背光模组需要在导光板的侧面设置LED灯条，LED灯条占据一定的边框厚度，使得侧入式背光模组的边框较宽，同时，导光板的厚度较厚，成为背光模组窄边框和薄型化的瓶颈。　　　
发明内容
　　　本发明的主要目的为提供一种采用侧发光式LED灯作为背光源的背光模组及包括该背光模组的显示装置，旨在实现背光模组及显示装置的更薄的厚度和更窄的边框。
　　　本发明提出一种背光模组，包括印刷电路板，固定在所述印刷电路板上的多个LED灯，设于所述印刷电路板上的反射片，所述反射片上具有与所述LED灯相配合的灯孔，还包括覆盖于所述反射片及所述LED灯上的全反射胶体，所述LED灯为侧发光式LED灯，所述全反射胶体对应所述LED灯设有与所述LED灯相配合的灯槽，所述反射片与所述全反射胶体接触的一面上设有散射网点。
　　　优选地，所述背光模组还包括相对设于所述反射片两侧的边框架，所述边框架位于所述印刷电路板的上方并与所述印刷电路板的表面抵接，反射片覆盖印刷电路板的表面和边框架的侧面，围成一空腔，全反射胶体通过在所述空腔中点胶、喷涂或者灌装工艺形成。
　　　优选地，所述背光模组还包括相对设于所述反射片两侧的边框架，所述边框架位于所述印刷电路板的上方并与所述印刷电路板的表面抵接，反射片只覆盖印刷电路板的表面，全反射胶体通过在边框架与反射片围成的空腔内点胶、喷涂或者灌装工艺形成。
　　　优选地，所述全反射胶体的折射率大于等于1.45且小于等于1.55。
　　　优选地，所述全反射胶体的厚度为0.5mm-1.5mm。
　　　优选地，所述全反射胶体为透明硅胶或环氧树脂。
　　　优选地，所述散射网点印刷或喷涂在所述反射片上。
　　　优选地，所述反射片上靠近所述LED灯的散射网点的直径小或密度低，远离所述LED灯的散射网点的直径大或密度高。
　　　优选地，还包括背板和光学膜片，所述印刷电路板安装在所述背板上，所述光学膜片设在所述全反射胶体上。
　　　本发明还提出一种显示装置，包括液晶面板和背光模组，所述背光模组为如上所述的背光模组。　　　
　　　本发明的背光模组和显示装置，全反射胶体可以通过点胶、喷涂或者灌装等工艺形成，胶体的厚度是可以控制，只需要覆盖LED灯高度即可，全反射胶体的厚度大概为0.5mm-1.5mm，相比现有的导光板，厚度更小，整个背光模组厚度降低，实现了背光模组的薄型化；另外，LED灯不设置在边框架上，而是设置在全反射胶体的下方，使得背光模组的边框更窄。　　　
附图说明
　　　图1是本发明背光模组较佳实施例的结构示意图；
　　　图2是本发明背光模组较佳实施例中LED灯在印刷电路板上的分布示意图；
　　　图3是本发明背光模组较佳实施例中反射片的结构示意图。　　　
　　　本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。　　　
具体实施方式
　　　应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
　　　如图1至图3所示，图1为本发明背光模组较佳实施例的结构示意图，图2为本发明背光模组较佳实施例中LED灯在印刷电路板上的分布示意图，图3为本发明背光模组较佳实施例中反射片的结构示意图。
　　　该实施例提到的背光模组，包括印刷电路板10，固定在印刷电路板10上的多个LED灯30，设于印刷电路板10上的反射片40，反射片40上具有与LED灯30相配合的灯孔41。背光模组还包括覆盖于反射片40及LED灯30上的全反射胶体50，上述全反射胶体50的折射率大于等于1.45且小于等于1.55。LED灯30为侧发光式LED灯30，全反射胶体50对应LED灯30设有与LED灯30相配合的灯槽（未标号），反射片40与全反射胶体50接触的一面(即顶面)上设有散射网点(图未示)。背光模组还包括相对设于反射片40两侧的边框架20，边框架20位于印刷电路板10的上方并与印刷电路板10的表面抵接。本实施例中，反射片40覆盖印刷电路板10的表面和边框架20的侧面，使射到边框架20的侧面上的光线被反射再次利用，因此可以提升整体背光光效；在其他实施例中，反射片40可以只覆盖印刷电路板10的表面。上述侧发光式LED灯30即从侧面发光的LED灯30。
　　　具体的，本实施例中，全反射胶体50为透明硅胶或者环氧树脂。当然，全反射胶体50还可以为其他有机胶或者无机胶，只要全反射胶体50的折射率大于等于1.45且小于等于1.55，进而实现光线的全反射即可。
　　　具体的，本实施例中，由于反射片40覆盖印刷电路板10的表面和边框架20的侧面，所以反射片40围成一空腔，全反射胶体50通过在所述空腔中点胶、喷涂或者灌装等工艺形成，因此使得反射片40与全反射胶体50之间没有空气层，减少了反射光线进出介质的种类，降低了光线在介质面上的菲涅耳界面损失，提高了背光源的光效。
　　　在反射片40只覆盖印刷电路板10的表面的实施例中，全反射胶体通过在边框架20与反射片40围成的空腔内点胶、喷涂或者灌装等工艺形成。
　　　本实施例提出的背光模组，采用侧发光式LED灯30作为背光源，LED灯30位于全反射胶体50的灯槽中，LED灯30侧面发射出的光线进入到全反射胶体50中，在全反射胶体50中一直进行全反射传播，直至光线反射到反射片40上时，经反射片40上的散射网点产生散射，破坏光线的全反射，然后光线被引导出全反射胶体50，形成面光源。
　　　相较于现有技术，本发明的全反射胶体50可以通过点胶、喷涂或者灌装等工艺形成，胶体的厚度是可以控制，只需要覆盖LED灯30高度即可，全反射胶体50的厚度大概为0.5mm-1.5mm，相比现有的导光板，厚度更小，整个背光模组厚度降低，实现了背光模组的薄型化。另外，LED灯30不设置在边框架20上，而是设置在全反射胶体50的下方，使得背光模组的边框更窄。
　　　本实施例中，反射片40上的散射网点通过印刷或者喷涂在反射片40上，靠近LED灯30的散射网点的直径小或密度低，远离LED灯30的散射网点的直径大或密度高。散射网点可以为圆形或三角形或其他多边形。本实施例中，反射片40与印刷电路板10通过背胶粘贴，当然反射片40与印刷电路板10之间还可以通过其他方式固定。
　　　进一步地，LED灯30错开排列在印刷电路板10上。本实施例中，LED灯30采用错开排列分布，使得背光模组的光线更均匀，背光亮度均匀。本实施例的LED灯30可以通过串联方式连接或者通过并联方式连接，还可以通过串联与并联混合的方式连接。本实施例的印刷电路板10可以为一块整体式的电路板结构，也可以为多块电路板拼合而成。
　　　进一步地，本实施例的反射片40为银反射片40或镀银反射片40。银反射片40的反射率高，反射效果更好，保证了背光源的光效。
　　　具体的，本实施例的背光模组还包括背板60和光学膜片70，印刷电路板10安装在背板60上，光学膜片70设在全反射胶体50上。本实施例中，印刷电路板10可通过导热双面胶与背板60固定，通过导热双面胶将LED灯30产生的热量传导到背板60上散去。
　　　本发明还提出一种显示装置，包括液晶面板和背光模组，该背光模组可包括前述图1至图3所示实施例中所有技术方案，其具体结构可参照前述实施例，在此不做赘述。由于采用了前述背光模组的方案，本发明显示装置相较于现有的显示装置而言，厚度更薄了，且边框更窄了。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (18)

  1. 一种背光模组，包括印刷电路板，固定在所述印刷电路板上的多个LED灯，设于所述印刷电路板上的反射片，所述反射片上具有与所述LED灯相配合的灯孔，其特征在于，还包括覆盖于所述反射片及所述LED灯上的全反射胶体，所述LED灯为侧发光式LED灯，所述全反射胶体对应所述LED灯设有与所述LED灯相配合的灯槽，所述反射片与所述全反射胶体接触的一面上设有散射网点。
  2. 根据权利要求1所述的背光模组，其特征在于，还包括相对设于所述反射片两侧的边框架，所述边框架位于所述印刷电路板的上方并与所述印刷电路板的表面抵接，反射片覆盖印刷电路板的表面和边框架的侧面，围成一空腔，全反射胶体通过在所述空腔中点胶、喷涂或者灌装等工艺形成。
  3. 根据权利要求1所述的背光模组，其特征在于，还包括相对设于所述反射片两侧的边框架，所述边框架位于所述印刷电路板的上方并与所述印刷电路板的表面抵接，反射片只覆盖印刷电路板的表面，全反射胶体通过在边框架与反射片围成的空腔内点胶、喷涂或者灌装等工艺形成。
  4. 根据权利要求1所述的背光模组，其特征在于，所述全反射胶体的折射率大于等于1.45且小于等于1.55。
  5. 根据权利要求4所述的背光模组，其特征在于，所述全反射胶体的厚度为0.5mm-1.5mm。
  6. 根据权利要求4所述的背光模组，其特征在于，所述全反射胶体为透明硅胶或环氧树脂。
  7. 根据权利要求1所述的背光模组，其特征在于，所述散射网点印刷或喷涂在所述反射片上。
  8. 根据权利要求1所述的背光模组，其特征在于，所述反射片上靠近所述LED灯的散射网点的直径小或密度低，远离所述LED灯的散射网点的直径大或密度高。
  9. 根据权利要求1所述的背光模组，其特征在于，还包括背板和光学膜片，所述印刷电路板安装在所述背板上，所述光学膜片设在所述全反射胶体上。
  10. 一种显示装置，其包括液晶面板和背光模组，其特征在于，所述背光模组为如权利要求1所述的背光模组。
  11. 根据权利要求10所述的显示装置，其特征在于，还包括相对设于所述反射片两侧的边框架，所述边框架位于所述印刷电路板的上方并与所述印刷电路板的表面抵接，反射片覆盖印刷电路板的表面和边框架的侧面，围成一空腔，全反射胶体通过在所述空腔中点胶、喷涂或者灌装等工艺形成。
  12. 根据权利要求10所述的显示装置，其特征在于，还包括相对设于所述反射片两侧的边框架，所述边框架位于所述印刷电路板的上方并与所述印刷电路板的表面抵接，反射片只覆盖印刷电路板的表面，全反射胶体通过在边框架与反射片围成的空腔内点胶、喷涂或者灌装等工艺形成。
  13. 根据权利要求10所述的显示装置，其特征在于，所述全反射胶体的折射率大于等于1.45且小于等于1.55。
  14. 根据权利要求13所述的显示装置，其特征在于，所述全反射胶体的厚度为0.5mm-1.5mm。
  15. 根据权利要求13所述的背光模组，其特征在于，所述全反射胶体为透明硅胶或环氧树脂。
  16. 根据权利要求10所述的背光模组，其特征在于，所述散射网点印刷或喷涂在所述反射片上。
  17. 根据权利要求10所述的背光模组，其特征在于，所述反射片上靠近所述LED灯的散射网点的直径小或密度低，远离所述LED灯的散射网点的直径大或密度高。
  18. 根据权利要求10所述的背光模组，其特征在于，还包括背板和光学膜片，所述印刷电路板安装在所述背板上，所述光学膜片设在所述全反射胶体上。
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