CN106772768A - 一种多功能led背光源 - Google Patents

一种多功能led背光源 Download PDF

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CN106772768A
CN106772768A CN201611267353.3A CN201611267353A CN106772768A CN 106772768 A CN106772768 A CN 106772768A CN 201611267353 A CN201611267353 A CN 201611267353A CN 106772768 A CN106772768 A CN 106772768A
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guide plate
light guide
led
light
plate assembly
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赵圣铭
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Yancheng Sanding Electronic Technology Co Ltd
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    • 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
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    • G—PHYSICS
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    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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    • G02B6/0033—Means for improving the coupling-out of light from the light guide
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    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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    • G02B6/0086—Positioning aspects
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    • G—PHYSICS
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    • 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
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    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
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    • G02F1/1336—Illuminating devices
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    • 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
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    • 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
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    • G02F1/1336—Illuminating devices
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    • G02F1/133608—Direct backlight including particular frames or supporting means
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    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
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    • 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
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    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract

本发明涉及一种多功能LED背光源，包括钢化玻璃膜、LED模组、导光板组件、扩散膜层、棱镜膜BEF层、胶铁一体框和镀银遮光胶带，LED模组和导光板组件均设置在胶铁一体框的安装槽内，LED模组位于导光板组件的一侧，棱镜膜BEF层和扩散膜层从上往下依次设置在导光板组件的上部，镀银遮光胶带框将棱镜膜BEF层与胶铁一体框的边缘粘贴在一起，钢化玻璃膜粘贴在镀银遮光胶带框的顶部；导光板组件包括玻璃导光板和设置在玻璃导光板底部的反光膜层，LED模组包括铝基板和一排并联设置在铝基板上的SMD LED灯珠，铝基板上设有光敏PWM调光电路，所有SMD LED灯珠均与光敏PWM调光电路电连接。本LED背光源具有良好的散热性能，且能够自动调光来提高液晶显示屏的显示图像效果。

Description

一种多功能LED背光源
技术领域
本发明涉及一种LED背光源，尤其涉及一种应用于移动终端、车载显示、娱乐显示、工控仪表等中小尺寸显示产品上的具有散热好、可自适应调光的薄型多功能LED背光源。
背景技术
由于液晶显示屏为非发光性的显示装置，须要借助背光源才能达到显示的功能。根据背光源所采用光源的不同，目前主要有EL、CCFL及LED三种背光源类型，而由于LED背光源具有很多优点，不含有毒物质汞、具有极佳的色域显示、有很好的机械震动稳定性、有比CCFL 更长的寿命、控制电路简单、驱动电压低、纳秒级的开关时间等。因为LED的上述优越性，未来的发展趋势是LED背光源代替CCFL背光源成为主流。然而由于LED在使用过程中，其中约有70%以上的能量转化成了热能，若这些热能没有及时排出，将会导致LED的温度升高，影响LED的使用寿命，降低了LED的亮度，从而使得LED背光源的性能下降。另外，现有LED背光源也不具有自动调光的功能，这在液晶显示屏使用过程中较难以展现出明暗对比自然的高品质显示图像效果。
发明内容
本发明的目的在于提供一种散热性能好、能够自动调光且具有轻薄结构的多功能LED背光源。
为了实现上述目的，本发明采用的技术方案为，一种多功能LED背光源，包括钢化玻璃膜、LED模组、导光板组件、扩散膜层、棱镜膜BEF层、胶铁一体框和镀银遮光胶带，所述LED模组和导光板组件均设置在胶铁一体框的安装槽内，所述LED模组位于导光板组件的一侧，所述棱镜膜BEF层和扩散膜层从上往下依次设置在导光板组件的上部，所述镀银遮光胶带框设置在棱镜膜BEF层的顶部四周，并且将棱镜膜BEF层与胶铁一体框的边缘粘贴在一起，所述钢化玻璃膜粘贴在镀银遮光胶带框的顶部；所述导光板组件包括玻璃导光板和设置在玻璃导光板底部的反光膜层，所述LED模组包括铝基板和一排并联设置在铝基板上的SMD LED灯珠，所述铝基板上设有光敏PWM调光电路，所有SMD LED灯珠均与光敏PWM调光电路电连接。
作为本发明的一种改进，所述玻璃导光板采用厚度为0.1-3mm的光学透明玻璃制作而成。
作为本发明的一种改进，所述反光膜层的反射面呈凹凸不平的形状，通过将反射面设计成凹凸不平的形状，使得射向反射膜层的光线经反射面反射后，呈分散状射向玻璃导光板，可保证照射到导光板的光线的均匀性，并可有效防止漏光。
作为本发明的一种改进，所述SMD LED灯珠采用LED白灯，其数量为5-10颗，每颗灯珠的功率为0.2W，流明照度为45-50Lx。
作为本发明的一种改进，所述光敏PWM调光电路包括光敏传感器和带有PWM调光功能的LED恒流驱动芯片，所述光敏传感器连接LED恒流驱动芯片的输入端，LED恒流驱动芯片的输出端连接SMD LED灯珠。
作为本发明的一种改进，所述SMD LED灯珠和铝基板之间采用导热硅胶相连接，可提高散热性能。
相对于现有技术，本发明的整体结构设计巧妙，由于使用了带有各种安装槽的胶铁一体框以及铝基板，具有良好的结构稳定性，可有效防止背光源发生变形，另外，由于采用玻璃导光板和反光膜层构成的导光板组件既使得背光源的厚度大大变薄又提高了导光性能，由于LED模组中使用的是铝基板，相比于柔性线路板具有较好的散热性能，并且SMDLED灯珠与铝基板之间采用导热硅胶相连，这样就更加快了散热的效率，同时由于铝基板是直接设置在胶铁一体框的安装槽内，铝基板与胶铁一体框相接触的热传导也会加快，因此本LED背光源不会因LED灯珠产热严重而发生色偏现象。此外，在铝基板上设置的光敏PWM调光电路可根据外部环境亮度对LED灯条（设置在铝基板上的所有SMD LED灯珠组成）的亮度进行自动调节，可有效保证采用该LED背光源的液晶显示屏具有较高品质的显示图像效果。
附图说明
图1为本发明的结构示意图。
图2为本发明中光敏PWM调光电路的电路原理框图。
图中：1- LED模组，2-导光板组件，3-胶铁一体框，4-扩散膜层，5-棱镜膜BEF层，6-镀银遮光胶带，7-钢化玻璃膜。
具体实施方式
为了加深对本发明的理解和认识，下面结合附图对本发明作进一步描述和介绍。
如图1所示，一种多功能LED背光源，包括钢化玻璃膜7、LED模组1、导光板组件2、扩散膜层4、棱镜膜BEF层5、胶铁一体框3和镀银遮光胶带6。所述LED模组1和导光板组件2均设置在胶铁一体框3的安装槽内，胶铁一体框3的安装槽内部具有注塑成型的胶框，从而对各部件与铁框之间进行有效缓冲，可提高部件的安装稳定性。所述LED模组1位于导光板组件2的一侧，形成侧光源。所述棱镜膜BEF层5和扩散膜层4从上往下依次设置在导光板组件2的上部，所述镀银遮光胶带6框设置在棱镜膜BEF层5的顶部四周，并且将棱镜膜BEF层5与胶铁一体框3的边缘粘贴在一起，从而可避免漏光。所述钢化玻璃膜7粘贴在镀银遮光胶带6框的顶部，用于提高背光源的刚性，并对棱镜膜BEF层5直至导光板组件2等各部件起到一定的保护作用。所述导光板组件2包括玻璃导光板和设置在玻璃导光板底部的反光膜层。所述LED模组1包括铝基板和一排并联设置在铝基板上的SMD LED灯珠，所述铝基板上设有光敏PWM调光电路，所有SMD LED灯珠均与光敏PWM调光电路电连接。通过光敏PWM调光电路可对所有SMD LED灯珠的发光亮度进行调节，从而能够调节背光源的发光亮度。
所述玻璃导光板采用厚度为0.1-3mm的光学透明玻璃制作而成，具有厚度薄、导光均匀性好、光源利用率高等优点。在实际运用过程中可采用康宁的Iris玻璃作为该玻璃导光板。
所述反光膜层的反射面呈凹凸不平的形状，通过将反射面设计成凹凸不平的形状，使得射向反射膜层的光线经反射面反射后，呈分散状射向玻璃导光板，可保证照射到导光板的光线的均匀性，并可有效防止漏光。反射膜层通过紫外固化压敏胶与玻璃导光板的底部粘贴在一起。
所述SMD LED灯珠采用LED白灯，其数量为5-10颗，每颗灯珠的功率为0.2W，流明照度为45-50Lx。这样采用多颗中小功率的LED白灯作为光源，可在保证亮度满足要求的前提下，有效降低发热量，提高光亮可靠度及均匀性。
如图2所示，所述光敏PWM调光电路包括光敏传感器和带有PWM调光功能的LED恒流驱动芯片，所述光敏传感器连接LED恒流驱动芯片的输入端，LED恒流驱动芯片的输出端连接SMD LED灯珠。所述光敏传感器包括光敏电阻及信号调理电路，所述带有PWM调光功能的LED恒流驱动芯片包括PWM调光信号生成模块和LED恒流驱动模块。所述信号调理电路的输入端连接光敏电阻，信号调理电路的输出端连接PWM调光信号生成模块输入端，所述PWM调光信号生成模块的输出端连接LED恒流驱动模块的输入端，所述LED恒流驱动模块的输出端连接所有SMD LED灯珠。其中，所述信号调理电路是将光敏电阻在检测到外部光线强度后所产生的电阻阻值转换为0-10V电压信号，在不同的外界光线强度情况下，信号调理电路所产生的电压信号大小也将不同，PWM调光信号生成模块采集到不同的电压信号时对应产生不同占空比的PWM调光信号，并将PWM调光信号发送给LED恒流驱动模块从而产生相应的驱动LED灯珠的电流值。其中，所述信号调理电路可采用现有的能够将光敏电阻的阻值转换为0-5V电压信号并输出的电路即可实现，所述带有PWM调光功能的LED恒流驱动芯片可采用现有的SB42511芯片实现。
所述SMD LED灯珠和铝基板之间采用导热硅胶相连接，导热硅胶将热量通过铝基板和胶铁一体框3尽快散发出去，从而提高整体的散热性能。
本发明方案所公开的技术手段不仅限于上述实施方式所公开的技术手段，还包括由以上技术特征任意组合所组成的技术方案。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (6)

1.一种多功能LED背光源，其特征在于：包括钢化玻璃膜、LED模组、导光板组件、扩散膜层、棱镜膜BEF层、胶铁一体框和镀银遮光胶带，所述LED模组和导光板组件均设置在胶铁一体框的安装槽内，所述LED模组位于导光板组件的一侧，所述棱镜膜BEF层和扩散膜层从上往下依次设置在导光板组件的上部，所述镀银遮光胶带框设置在棱镜膜BEF层的顶部四周，并且将棱镜膜BEF层与胶铁一体框的边缘粘贴在一起，所述钢化玻璃膜粘贴在镀银遮光胶带框的顶部；所述导光板组件包括玻璃导光板和设置在玻璃导光板底部的反光膜层，所述LED模组包括铝基板和一排并联设置在铝基板上的SMD LED灯珠，所述铝基板上设有光敏PWM调光电路，所有SMD LED灯珠均与光敏PWM调光电路电连接。
2.如权利要求1所述的一种多功能LED背光源，其特征在于，所述玻璃导光板采用厚度为0.1-3mm的光学透明玻璃制作而成。
3.如权利要求1所述的一种多功能LED背光源，其特征在于，所述反光膜层的反射面呈凹凸不平的形状。
4.如权利要求2或3所述的一种多功能LED背光源，其特征在于，所述SMD LED灯珠采用LED白灯，其数量为5-10颗，每颗灯珠的功率为0.2W，流明照度为45-50Lx。
5.如权利要求4所述的一种多功能LED背光源，其特征在于，所述光敏PWM调光电路包括光敏传感器和带有PWM调光功能的LED恒流驱动芯片，所述光敏传感器连接LED恒流驱动芯片的输入端，LED恒流驱动芯片的输出端连接SMD LED灯珠。
6.如权利要求5所述的一种多功能LED背光源，其特征在于，所述SMD LED灯珠和铝基板之间采用导热硅胶相连接。
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CN107564432A (zh) * 2017-08-16 2018-01-09 杭州鸟人光电科技有限公司 可编程画面展示装置
CN108761915A (zh) * 2018-06-06 2018-11-06 江苏聚泰科技有限公司 一种lcm背光源
CN109645689A (zh) * 2019-01-26 2019-04-19 苏州承儒信息科技有限公司 一种用于学校的高效率课桌
CN110430638A (zh) * 2019-08-21 2019-11-08 上海莱狮半导体科技有限公司 电源驱动系统、电源驱动器及感应信号调理电路
CN110992835A (zh) * 2019-12-20 2020-04-10 京东方科技集团股份有限公司 阵列基板、显示装置及其驱动方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107564432A (zh) * 2017-08-16 2018-01-09 杭州鸟人光电科技有限公司 可编程画面展示装置
CN108761915A (zh) * 2018-06-06 2018-11-06 江苏聚泰科技有限公司 一种lcm背光源
CN109645689A (zh) * 2019-01-26 2019-04-19 苏州承儒信息科技有限公司 一种用于学校的高效率课桌
CN110430638A (zh) * 2019-08-21 2019-11-08 上海莱狮半导体科技有限公司 电源驱动系统、电源驱动器及感应信号调理电路
CN110430638B (zh) * 2019-08-21 2022-05-10 上海莱狮半导体科技有限公司 电源驱动系统、电源驱动器及感应信号调理电路
CN110992835A (zh) * 2019-12-20 2020-04-10 京东方科技集团股份有限公司 阵列基板、显示装置及其驱动方法

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