CN1760734A - 发光器件组件以及使用该组件的液晶显示器的背光单元 - Google Patents
发光器件组件以及使用该组件的液晶显示器的背光单元 Download PDFInfo
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Abstract
一种发光器件组件和使用该组件的液晶显示器的背光单元,其中风扇被用于强制冷却发光二极管组件和LCD的背光单元,以增加热辐射效率和防止器件性能下降。
Description
技术领域
本发明涉及发光器件组件以及使用该组件的液晶显示器的背光单元。
背景技术
通常,发光二极管(LED)是通过这样的原理把电变换成光的器件:如果使电流以正向流入包括两种不同半导体的结,电子和空穴在结区复合以产生光束。所述的LED具有的优点在于,其抗冲击,并且在特定条件下几乎具有永恒的寿命。
目前已经开发了超越白炽灯的LED。而且,近来已经致力于使用高效LED来作为发光装置。然而,所述的LED比不上荧光灯的效率,并且看来在短时间内不容易超过荧光的效率。
尽管LED的效率不能与荧光灯的相比,但是LED不包含荧光灯中污染环境的水银,以至于对于环境保护来说,有关LED的研发蓬勃的发展。
典型的,将背光照明(背光单元,BLU)提供到液晶显示器(LCD)设备的光源是冷阴极荧光灯(CCFL)。然而,CCFL包含水银并且不是白光,暴露了液晶显示器的颜色显示中的限制。
与此同时,尽管LED是单色光源,并且如果将三个红、绿和蓝LED组合,那么可以表示各种色温,以构成优秀的LED。
LED的缺点之一是,如果由光变换过程产生的热量使得元件的温度,特别是结上的温度增加到指定的水平,效率就会下降而寿命急剧地缩短。因此,将LED保持在低于90摄氏度的工作温度中是必要的,因为其缺点随温度增加。然而,因为从高温到低温的热流与温度差成比例,热辐射效率或密度变得下降。为此,用于背光单元的LED的应用或者高效发光需要特殊的热辐射设计。
特别是,在光源使用LED提供背光单元到LCD的情况下,应当充分利用LCD轻薄的长处,所以必须设计热辐射系统来满足这些条件。为了满足在当前的元件效率等级下20英寸以上的LCD所需的亮度级,需要超过300W/m2的热辐射容量。
图1是根据现有技术LCD上布置的背光单元的示意截面图。附图标记10是LCD。散热片(dissipation sheet)(20)被布置在LCD(10)的后表面。在散热片(20)的后表面上设置有基片(30),并且在基片(30)的前面排列有多个LED(31)。基片(30)在其后表面上附着有后表面片(40),并且在后表面片(40)的后表面上安装有多个冷却片(41)。
多个LED是LCD(10)的背光源,并且形成有冷却片(41)的背面片(40)是冷却背光源的冷却装置。
根据现有技术使用LED的背光单元的LCD即使只有热辐射和自然对流,也能近似辐射8-9W/m2K。然而,大显示设备需要的亮度所带来的问题是,产生的热量是现有技术的四倍,导致这样的问题,如果周围环境温度是30摄氏度,背面片的温度上升到几乎70摄氏度。
发明内容
公开了本发明以解决前述的问题,并且本发明的目的是提供发光器件(LED)组件和使用该组件的液晶显示器(LCD)的背光单元,其适于通过使用风扇强制冷却LCD的背光单元和LED组件,并增加热辐射效率和防止器件的性能下降。
根据本发明的第一方面,LED组件包括:金属基片;在金属基片的上表面上形成的绝缘片;在绝缘片上形成的多个电极线;焊接接到多个电极线的上表面和以行和列(lines)排列的LED;在其一个表面固定到金属基片下表面的多个条状突起,每个间隔预定的距离;固定到突起的另一表面的引导部件;和其中装入风扇的风扇外壳,用于通过吸入口吸收空气,并被安置在金属基片和引导部件的侧面,用于使吸收的空气通过突起的间隔循环。
根据本发明的另一方面,LED组件包括:其上排列有LED和其下形成有多个条状突起的主体,每个间隔预定的距离;以及吸入风扇,其通过多个突起的间隔注入空气,以通过吸入空气来冷却主体的下部和多个突起。
根据本发明的另一方面,使用LED的用于液晶显示器(LCD)的背光单元包括:安置在具有前表面和后表面的LCD的后表面上的散热片;安置在散热片的后表面上的基片,并在其前面排列有多个LED;和冷却装置,其通过把风扇吸收的空气排出到基片的背表面来冷却基片。
附图说明
通过参考附图详细描述优选实施例,本发明的上述目的和其他优点将更加显而易见,在附图中:
图1是根据现有技术布置在LCD上的背光单元的示意截面图;
图2是根据本发明LED组件的示意透视图;
图3是根据本发明从LED组件产生的热量的路线示意透视图;
图4是示意方框图,其示例了根据本发明进一步安装有附加部件的LED组件中被循环的空气;
图5a和5b是示意截面图,用于描述根据本发明金属基片或引导部件上的突起的形成;
图6是根据本发明进一步安装有用于排出空气的风扇外壳的气流的总体图;
图7是根据本发明用于LCD的背光单元的示意结构截面图;
图8a和8b是根据本发明在背光单元的冷却装置上形成的吸入口的布局的示意结构截面图;
图9是根据本发明在背光单元上安装的冷却装置的示意透视图;
图10是根据本发明使用风扇强制冷却背光单元的冷却效率的测量图;和
图11示例了根据本发明基于气流的每个部分的温度改变的测量图。
具体实施方式
现在将参考附图详细描述本发明的优选实施例。
图2是根据本发明的LED组件的示意透视图。
LED组件包括:金属基片(150),在金属基片(150)的上表面上形成的绝缘片(151)在绝缘片(151)上形成的多个电极线(152a,152b);焊接接到多个电极线(152a,152b)的上表面的和以行和列排列的LED(160);在其一个表面固定到金属基片的下表面的多个条状突起(301),每个间隔预定的距离;和固定到突起(301)的另一表面的引导部件(310)。
参考图3,LED组件中安装有通过吸入口(321)吸收空气的风扇(322),并进一步安置有风扇外壳(320),其中装入有通过吸入(321)吸收空气的风扇(322),并被安置在金属基片(150)和引导部件(301)的侧面,以通过突起(301)的间隔使吸收的空气循环。优选的,风扇(322)是横流风扇(cross flow fan)。
这样构成LED组件以便操作风扇(322)通过吸收入口(321)吸入空气,并且在突起(301)的间隔中使吸入的空气循环以强制地冷却LED(160)产生的热量,借此提高冷却效率和防止器件的性能下降。
此时,LED(160)产生的热量被传送到金属基片(150),并被沿着金属基片(150)的底表面循环的空气冷却。
现在,参考图3,通过风扇外壳(320)的吸入口(321)在‘A’方向吸入的空气用来冷却金属基片(150),并在‘B’方向被排出。
而且,从金属基片(150)辐射的热量也被传送到突起(301),其随后通过接触的空气被冷却以完成散热鳍片(fin)功能。
图4是根据本发明进一步布置有附加部件的LED组件中被循环的空气的示例方框图,其中由风扇外壳(320)的风扇吸收的空气被冷却单元(400)冷却,并且冷却的空气沿着金属基片的底表面(150a)流动以进一步增强LED组件的辐射效果。
换句话说,优选地,图2和3的LED组件被进一步布置有冷却单元以便冷却空气,并把冷却的空气送到风扇外壳(320)的吸入口。优选地,进一步安装循环管(410)以便把已经沿着金属基片的底表面(150a)流动的空气送到冷却单元(400),并接着空气被排出。当然,冷却单元(400)和风扇外壳(320)的吸入口经一个管子被连接以便冷却单元(400)的冷却的空气经该管子被引入到风扇外壳的吸收入口中。
图5a和5b是根据本发明用于描述在金属基片或引导部件上形成的突起的示意截面图。图5a的金属基片(150)被蚀刻以形成突起(301),并且突起(301)和金属基片(150)被整体形成。图5b的引导部件(310)和突起(301)被整体形成。
图6是根据本发明进一步安置有用于排出空气的风扇外壳的气流的总体图,其中金属基片(150)其下安装有风扇外壳(320)以便空气吸入,并且金属基片(150)其上形成有风扇外壳(450)以便排出空气。
换句话说,用于吸入空气的风扇外壳(320)的风扇(322)用来便于经吸收入口(321)吸入空气,而风扇外壳(350)的风扇(352)作用来便于经排出(351)排出空气。通过排出空气的风扇外壳(320),空气沿着金属基片(150)快速流动,来更有效地冷却金属基片(150)。
同时,根据本发明的LED组件包括:其上排列有LED、其下形成有多个条状突起的主体,每个突起间隔预定的距离;和吸入风扇,其通过多个突起的间隔注入空气,以通过吸收空气来冷却主体的下部和多个突起。而且,在主体的一个侧表面上形成吸入风扇,并在主体的另一个侧表面上形成有排气扇,以吸取通过多个突起引入的空气。
优选地,吸入风扇、多个突起和排气扇与外界密封隔绝,以便从吸入风扇吸入的空气被排气扇经多个突起排出,并且被吸入风扇再次吸入。
在吸入风扇和排气扇之间,还安装有冷却单元,用于冷却排气扇排出的空气和用于把冷却的空气送到吸入风扇。
图7是根据本发明用于LCD的背光单元的示意结构截面图。
使用LED的用于液晶显示器(LCD100)的背光单元包括:安置在具有前表面和后表面的LCD(100)的后表面上的散热片(120);安置在散热片(120)的后表面上的基片(130)并在其前面排列有多个LED(131);和冷却装置(200),其通过把风扇(250)吸收的空气排出到基片的后表面(130)来冷却基片(130)。
根据本发明的背光单元用来通过用风扇(250)吸收空气强制地冷却其上安排多个LED(131)的基片(130)。基片(130)由金属构成并增强LED(131)产生的热量的辐射效率。
冷却单元(200)包括:背表面片(210),在其一侧附着于基片(130)的背表面上,基片前面安排多个LED,而在其后表面上突起有多个散热鳍片(211),每个间隔预定的距离;引导部件(220)附着于多个散热鳍片(211)的末端并在散热鳍片中形成间隔;风扇(250)布置在基片(130)的下面以便通过背表面片(210)和引导部件(220)排出吸入的空气;和风扇外壳(270),其固定在LCD(100)和引导部件(220)的下面并具有吸入空气的吸入口,并且其中安装有风扇(250)。
优选地,多个散热鳍片(211),背表面片(210)和引导部件(220)由金属构成以增强冷却效率。
图8a和8b是根据本发明在背光单元的冷却装置上形成的吸入口的布局的示意结构截面图。
参考图8a,冷却单元(200)的吸入口(261)形成在风扇外壳(270)的下面,或如图8b所示,吸收入口(262)形成在与LED(100)的前表面平行的风扇外壳(270)的前表面上。
图9是根据本发明在背光单元上安装的冷却装置的示意透视图。根据本发明在背光单元的冷却装置(200)上布置的背表面片(210)被附着于基片(130)的后表面,其上前面安排有多个LED(131)。
而且,在背表面片(210)上形成的多个散热鳍片(211)的末端附着有引导部件,并在散热鳍片中形成有间隔。
如果布置在基片(130)下面的风扇(250)在背表面片(210)和引导部件(220)中充入吸入的空气,吸入的空气经过沿着背表面片(210)的散热鳍片形成的间隔并经排出口(265)被排出到外部。
优选地,风扇是横流风扇。换句话说,横流风扇比轴流风扇噪声小,却产生更大量的气流,因此本发明采用横流风扇。
图10是根据本发明使用风扇强制冷却背光单元的冷却效率的测量图。
回到图9,首先,基片温度随散热鳍片高度(h)和间隙(d)被增加而上升。尽管增加和减少散热鳍片厚度(T)不会影响基片温度,但是,如在本发明中,风扇上气流的增加会明显降低基片的温度。
随后,可以注意到,根据本发明,对比现有技术中使用散热鳍片来冷却背光单元,使用风扇来强制冷却空气的结构增加了冷却效率。
图11示例了根据本发明基于气流的每个部分的温度改变的测量图。
参考图11,前面安排有多个LED的基片的温度,通过排出口排出的空气的温度和背表面片的最大温度随着气流的增加而下降。
换句话说,应该明白的是,如果使用风扇强制冷却空气,那么可以增加背光单元的冷却效率。
可供参考,图中背光单元的热辐射量是680W/m2,相对于各自空气流分成几块的每个部分的理论数据值已通过移动相关部分进行了测量。
基于前述显而易见,根据本发明发光器件(LED)组件和使用该组件的液晶显示器(LCD)的背光单元具有的优点在于,风扇被用于强制冷却LED组件和LCD的背光单元以增加热辐射效率和防止器件性能下降。
尽管已经详细描述了本发明,但本领域技术人员应该明白,在不脱离本发明的精神和范围的情况下,可以作出各种改变、替换和变换。
Claims (17)
1.一种发光二极管组件,其包括:
金属基片;
在金属基片的上表面形成的绝缘片;
在绝缘片上形成的多个电极线;
电连接到多个电极线的上表面并以行和列排列的发光二极管;
在其一个表面固定到金属基片的下表面的多个条状突起,每个间隔预定的距离;
固定到突起的另一表面的引导部件;和
风扇外壳,其中装入风扇用于通过吸入口吸入空气,并安置在金属基片和引导部件的侧表面,以使吸入的空气通过突起的间隔循环。
2.如权利要求1所述的发光二极管组件,进一步包括冷却单元,用于冷却空气和用于把冷却的空气送到风扇外壳的吸入口。
3.如权利要求1所述的发光二极管组件,进一步包括循环管,其用于把从多个突起中的间隔排出的空气送到冷却单元。
4.如权利要求1所述的发光二极管组件,其中该风扇是横流风扇。
5.如权利要求1所述的发光二极管组件,其中金属基片和突起是整体形成的。
6.如权利要求1所述的发光二极管组件,其中该引导部件和突起是整体形成的。
7.一种发光二极管组件,其包括:
主体,其上排列有发光二极管,其下形成有多个条状突起,每个间隔预定的距离;和
吸入风扇,其通过多个突起的间隔注入空气,以通过吸入空气来冷却主体的下部和多个突起。
8.如权利要求7所述的发光二极管组件,其中在主体的侧表面上形成吸入风扇,并且在主体的另一个侧表面上进一步安装排气扇,以吸收多个突起中引入的空气并排出空气。
9.如权利要求8所述的发光二极管组件,其中吸入风扇、多个突起和排气扇与外界密封隔绝,使得从吸入风扇吸入的空气被排气扇经多个突起排出,并被吸入风扇再次吸入。
10.如权利要求9所述的发光二极管组件,其中,在吸入风扇和排气扇之间,进一步安装有冷却单元,用于冷却由排气扇排出的空气和用于把冷却的空气送到吸入风扇。
11.如权利要求9所述的发光二极管组件,其中风扇是横流风扇。
12.一种使用发光二极管的液晶显示器(LCD)的背光单元,其包括:
安置在具有前表面和后表面的LCD的后表面上的散热片;
安置在散热片的后表面上的基片,并且在其前面排列有多个发光二极管;和
冷却装置,其通过把风扇吸入的空气排出到基片的后表面来冷却基片。
13.如权利要求12所述的背光单元,其中该冷却单元包括:
背表面片,在其一侧附着于基片的背表面上,基片前表面安排多个发光二极管和在其后表面上突起有多个散热鳍片,每个散热鳍片间隔预定的距离;
引导部件,其附着于多个散热鳍片的末端并在散热鳍片中形成间隔;
风扇,其被布置在基片的下面,以通过背表面片和引导部件排出吸入的空气;和
风扇外壳,其固定在发光二极管和引导部件的下面,并具有用于吸入空气的吸入口,并且在其中安装有风扇。
14.如权利要求13所述的背光单元,其中冷却单元的吸入口形成在风扇外壳的下面,或者形成在与发光二极管的前表面平行的风扇外壳的前表面上。
15.如权利要求12所述的背光单元,其中该风扇是横流风扇。
16.如权利要求12所述的背光单元,其中基片由金属构成。
17.如权利要求13所述的背光单元,其中多个散热鳍片和后表面以及引导部件由金属构成。
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Also Published As
Publication number | Publication date |
---|---|
EP1647766A2 (en) | 2006-04-19 |
KR100638047B1 (ko) | 2006-10-23 |
DE602005027301D1 (de) | 2011-05-19 |
EP1647766B1 (en) | 2011-04-06 |
EP1647766A3 (en) | 2009-02-25 |
US20060082271A1 (en) | 2006-04-20 |
JP2006114501A (ja) | 2006-04-27 |
KR20060033669A (ko) | 2006-04-19 |
TWI275192B (en) | 2007-03-01 |
TW200612587A (en) | 2006-04-16 |
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