CN102810288A - 背光组件和包括该背光组件的显示装置 - Google Patents
背光组件和包括该背光组件的显示装置 Download PDFInfo
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Abstract
本发明提供了一种背光组件以及包括该背光组件的显示装置。该显示装置包括显示面板和背光单元,背光单元设置在显示面板的后表面上并发射光到显示面板,背光单元包括白光发光二极管和量子点发光二极管。
Description
技术领域
根据本发明总发明构思的装置、组件和制品涉及一种背光组件和包括该背光组件的显示装置,更具体而言,涉及一种向显示面板供应光的背光组件和包括该背光组件的显示装置。
背景技术
液晶显示器(LCD)是最为广泛使用的信息显示装置类型之一,并在从用于移动电话的屏幕到超大LCD电视的宽应用范围中使用。由于LCD本身不产生光,所以它们使用投射背光的背光组件来传达图像。
当前使用的LCD背光的类型是发光二极管(LED)、电致发光器件(EL)、冷阴极荧光灯(CCFL)、外部电极荧光灯(EEFL)、平板灯(flat lamp,FL)等。在这些灯中,LED由于其低功耗、长寿命和消除了汞污染的优点而用作LCD背光的光源。
在常规LED中使用模块,在该模块中具有单一光学性质的LED封装布置成线。然而,当使用单个LED封装时,色彩再现性仅为国家电视制式委员会(NTSC)标准中指示的整个范围的79%。此外,LED封装的峰值波长与LCD液晶的滤色器的峰值波长的匹配敏感地影响色彩再现性、光效率和白色坐标(white color coordinate)。
发明内容
本发明总发明构思的多个方面提供一种包括白光LED和QD(量子点)LED的背光组件以及包括该背光组件的显示装置。
根据示例实施方式的一方面,提供一种显示面板,背光单元设置在该显示面板的后表面上并发射光到显示面板,背光单元发射单元,该发射单元包括包括白光发光二极管(LED)和量子点(QD)LED。
背光单元还可以包括散布从白光LED和QD LED发出的光的导光板,且白光LED和QD LED可以设置成沿所述导光板的至少一个边缘彼此交替。例如,白光LED和QD LED可以沿导光板的左边缘和右边缘布置,或者沿导光板的上边缘和下边缘布置。
发射单元可以沿导光板的至少一个边缘设置,还可以包括白光LED和QD LED设置于其上的LED条。
背光单元可以还包括将从白光LED和QD LED发出的光散布到显示面板的导光板,白光LED和QD LED可以设置为在导光板的后表面上彼此交替。
根据示例实施方式的另一方面,提供一种用于向显示面板提供背光的背光组件,发射单元包括发射光的白光发光二极管(LED)和量子点(QD)LED以及导光板,导光板将从发射单元发出的光散布到显示面板。
发射单元可以包括白光LED和QD LED以彼此交替的方式设置于其上的LED条,该LED条可以安装在导光板的一个边缘或两个相对边缘上。
LED条可以安装在导光板的左边缘和右边缘上,或者在导光板的上边缘和下边缘上。
白光LED和QD LED可以在导光板的后表面上以彼此交替的方式设置。
附图说明
通过下列结合附图对实施例的描述,上述和/或其他方面将变得明显且更易于理解,在附图中:
图1是示出根据一示例实施方式的显示装置的结构的方框图;
图2是示出根据一示例实施方式的背光单元的结构的方框图;
图3A是根据一示例实施方式的背光单元的平面图;
图3B是根据一示例实施方式的背光单元的侧视图;
图4是根据一示例实施方式的LED条的平面图;
图5A和图5B分别是根据一示例实施方式的量子点(QD)LED和白光LED的平面图;
图6和图7是用于解释根据一示例实施方式的白光LED和QD LED的特性的图。
具体实施方式
现在将详细参考示例实施方式,其示例在附图中示出,其中通篇相似的附图标记指示相似的元件。在下文参考附图依次描述示例实施方式。
图1是示出根据一示例实施方式的显示装置的结构的方框图。参照图1,显示装置1000包括显示面板100和背光单元200。
显示面板100配置为显示图像。具体地,显示面板100可以实施为多种颜色的(diverse color)液晶,并可以通过调节背光单元200产生的背光的穿透率来可视化图像信号,从而在屏幕上显示输入图像。例如,显示面板100可以实施为其中形成两个基板的LCD面板。两个基板中的每个具有设置为面对LCD面板的表面的电极,在电极之间产生电场。液晶材料注入在两个基板之间,液晶分子通过施加电压到电极而产生的电场移动。图像或文本通过背光的透射而显示,该透射根据电场的变化而变化。
背光单元200设置在显示面板100的后部并发射光到显示面板100。具体地,背光单元200包括白光LED和量子点(QD)LED,并散布从LED发出的光,使得可以均匀地发射光到面板表面。此时,白光LED和QD LED可以彼此交替地布置。
在下文,将参照图2详细描述背光单元200的具体结构。
图2是示出根据一示例实施方式的背光单元的结构的方框图。参照图2,背光单元200包括发射单元210和导光板220。
发射单元210包括至少一个发光二极管并配置为提供光。发光二极管可以实施为包括白光LED和QD LED的LED模块。该白光LED和QD LED可以彼此交替地布置在LED条上。
LED是通过利用施加电压到半导体时产生的电致发光效应(电场发射)而发光的元件。发射波长在可见区域或近红外区域、具有高发光效率并能产生p-n结的材料适合用作LED的材料。这样的材料的示例为GaN、GaAs、GaP、GaAs1-xPx、Ga1-xAlxAs、InP、In1-xGaxP等,也称为半导体合金。
导光板220配置为将从发射单元210发出的光散布到显示面板100。具体地,导光板220通过多次反射而朝向导光板的整个前侧散布(distribute)从发射单元210入射的光,使得光可以均匀地被传送到显示面板100的面板表面。
在下文,将参照图3A和图3B详细地描述背光单元200的具体结构。
图3A是根据一示例实施方式的背光单元200的平面图。通常,根据光源的布置而将背光分为直接型和边缘型。直接型通过将光源设置在LCD面板的整个后表面、将漫射板设置在光源的前侧并将反射板设置在光源的后侧而反射并漫射从光源发出的光。然而,直接型在减薄LCD面板方面存在限制,因为光源与漫射板之间的距离影响可能获得的亮度均匀性。
因此,如图3A所示,背光单元200可以实施为边缘型单元。即,光源分别设置在导光板的一个边缘处和导光板的面对所述一个边缘的另一边缘处,从光源发出的光入射到导光板的侧部。此时,入射到导光板的光通过全反射而散布到导光板的整个内部。表面光源可以通过使用光学膜光混合、背反射等来实施,由此产生LCD面板的背光。这样,在边缘型中,光源附接到导光板的侧部,这允许LCD面板保持薄的厚度并仍能利用反射表面增加亮度均匀性。
因此,在本示例实施方式中,产生光的LED条212安装在导光板的两边缘上,作为发光二极管的白光LED 211和QD LED 213沿着该边缘彼此交替地布置在其上。例如,LED布置为W-Q-W-Q-W-Q等。具体地,LED条212可以分别安装在导光板220的上边缘和下边缘上,或者分别在导光板220的左边缘和右边缘上。因此,白光LED 211和QD LED 213可以分别在导光板220的上边缘和下边缘或者左边缘和右边缘彼此交替地布置成线。
图3B是根据一示例实施方式的背光单元200的侧视图。在下文,为了描述的方便,介绍了显示面板实施为LCD面板的情况。
LED条212安装在导光板220的边缘上并且其上形成发射光到导光板220的侧部的至少一个LED 215。例如,至少一个LED 215可以包括彼此交替地布置在LED条212上的白光LED和QD LED。
导光板220配置为散布从LED 215入射的光并将其均匀地传送到LCD面板100的面板表面。这样,导光板220可以实施为棱镜(Prism)LGP或柱面透镜阵列(Lenticular)LGP。
反射层225设置在导光板220的下表面上,并改变从LED条212发出的光的方向从而引导光朝向漫射片230。而且,反射层225使得能够增加到LCD单元(cell)的光强度并防止光损失。用于反射层的材料是诸如聚乙烯(PE)、聚对苯二甲酸乙二醇酯(PET)树脂等的膜。
光学膜230、235和240设置在导光板220的上表面上,漫射并分散通过导光板220入射的光,这导致提高了亮度均匀性。光学膜可以实施为漫射片230、棱镜片235和双亮度增强膜(DBEF)片240,虽然在图3B中示出使用了所有的上述膜,但是在其他示例实施方式中可以仅使用上述膜中的一个。
除此以外,背光单元可以还包括顶架(top chassis)245、中间模250、LED PCB 255和底架260,但这些部件不涉及本发明构思的技术特征,因此省略了这些特征的详细描述。
如上所述,白光LED和QD LED用作根据一示例实施方式的背光单元和包括其的显示装置中的光源,白光LED和QD LED彼此交替地布置。结果,可以实现比使用常规的单一LED时更宽范围的色彩。此外,QD LED具有窄的半幅,使得能够与LCD面板的滤色器良好匹配并由此增加光效率。具体地,红色(R)区域和绿色(G)区域可以实现高的色彩表达性质。
在上述示例实施方式中,使用白光LED,但在其他的示例实施方式中可以与QD LED一起使用其他类型的LED。
在上述示例实施方式中,白光LED和QD LED一个接一个地彼此交替地布置,但这只是一示例。白光LED和QD LED可以以每轮两个或更多个LED的方式彼此交替地布置(例如,W-W-Q-Q-W-W-Q-Q等),也可以每轮白光LED的数目比QD LED的数目多或者少(例如,W-Q-Q-W-Q-Q,或W-W-W-Q-W-W-W-Q等)。
在上述示例实施方式中,使用了边缘型的背光单元,但这只是一示例。即,本发明构思可以应用于直接型和边缘型。
在直接型的情况下,白光LED和QD LED可以在导光板的后表面上彼此交替地设置。具体地,白光LED依次设置在其上的LED模块和QD LED依次设置在其上的LED模块可以彼此交替地布置(例如,一行W,一行Q,一行W,一行Q,等等)在导光板的后表面上。而且,白光LED和QD LED可以在导光板的后表面上沿着所有的线彼此交替地布置(例如,第一行:W-Q-W-Q等;第二行:Q-W-Q-W等;第三行:W-Q-W-Q等等)。
此外,对于边缘型,白光LED和QD LED可以仅在导光板的一个边缘交替地设置,与上面所述的在导光板的两个边缘交替地设置不同。即,白光LED和QD LED彼此交替地布置在其上的LED条可以仅设置在导光板的一个边缘。
图4是根据一示例实施方式的LED条212的平面图。如图4所示,LED条212上形成以规则间距彼此交替地布置的至少一个白光LED 211和至少一个QD LED 213。
图5A和图5B分别是根据一示例实施方式的QD LED和白光LED的平面图。
图5A示出QD LED的平面图。如图5A所示,QD LED可以通过在蓝光LED芯片或紫外(UV)LED芯片上施加硅并在其上结合QD磷光体213-1而实现。
图5B示出白光LED的平面图,该白光LED可以通过在蓝光LED芯片或UV LED芯片上施加磷光体而实现。该白光LED也可以通过在两个或三个不同颜色的LED芯片(即,多芯片)上施加磷光体而实现。
图6和图7是解释根据一示例实施方式的白光LED和QD LED的特性的图。如图6和图7所示,QD LED在R、G和B波长区具有比白光LED高的峰值,这使得QD LED具有高的色彩再现性。因此,当实施背光组件时,当QD LED和白光LED结合为组件时可以实现更高的色彩再现性。
如上所述,根据示例实施方式,可以实现与使用常规的单一LED光源相比更宽范围的色彩。即,由于应用了在窄波段内产生强荧光且具有优异的色彩再现性的QD磷光体的QD LED用作光源,所以能够实现与使用常规的单一LED光源时相比更高的色彩表达性质。
此外,QD LED具有亮度随时间衰退的缺点,因此,QD LED与白光LED交替地布置。结果,色彩再现性加强且亮度的下降得到改善。此外,由于QD磷光体的半幅窄,所以与LCD液晶的滤色器的匹配率高,因此光效率增加。
如上所述,根据本发明总发明构思的多个方面,可以实现包括白光LED和QD LED的背光组件以及包括该背光组件的显示装置,使得显示装置可以实现与使用常规LED光源的面板相比更宽范围的色彩,并且由于QD LED的窄的半幅而导致的与LCD液晶的滤色器的良好匹配使得可以实现增加的亮度效率。
虽然已经示出并描述了本发明总发明构思的一些示例实施方式,但本领域技术人员将理解,可以对这些示例实施方式进行变化而不脱离本发明总发明构思的精神和范围,本发明总发明构思的范围由所附权利要求及其等同物限定。
本申请要求于2011年5月31日提交的韩国专利申请No.10-2011-0052259的优先权,其内容通过引用整体结合在此。
Claims (15)
1.一种显示装置,包括:
显示面板;和
背光单元,设置在所述显示面板的后表面上并将光发射到所述显示面板,所述背光单元包括发射单元,该发射单元包括白光发光二极管和量子点发光二极管。
2.根据权利要求1所述的显示装置,
其中所述背光单元还包括导光板,所述导光板将从所述白光发光二极管和所述量子点发光二极管发出的光散布到所述显示面板;且
其中所述白光发光二极管和所述量子点发光二极管沿所述导光板的至少一个边缘彼此交替地布置。
3.根据权利要求2所述的显示装置,其中所述白光发光二极管和所述量子点发光二极管沿所述导光板的左边缘和右边缘设置,或者沿所述导光板的上边缘和下边缘设置。
4.根据权利要求2所述的显示装置,
其中所述发射单元沿所述导光板的至少一个边缘设置;且
其中所述发射单元还包括其上布置所述白光发光二极管和所述量子点发光二极管的发光二极管条。
5.根据权利要求1所述的显示装置,
其中所述背光单元还包括导光板,所述导光板将从所述白光发光二极管和所述量子点发光二极管发出的光散布到所述显示面板;且
其中所述白光发光二极管和所述量子点发光二极管在所述导光板的后表面上以彼此交替的方式设置。
6.一种向显示面板提供背光的背光组件,所述背光组件包括:
发射单元,配置为包括白光发光二极管和量子点发光二极管并发射光;和
导光板,配置为将从所述发射单元发出的光散布到所述显示面板。
7.根据权利要求6所述的背光组件,
其中所述发射单元包括发光二极管条,在所述发光二极管条上所述白光发光二极管和所述量子点发光二极管以彼此交替的方式布置;且
其中所述发光二极管条安装在所述导光板的边缘上。
8.根据权利要求7所述的背光组件,其中所述发射单元包括两个所述发光二极管条,该两个发光二极管条分别安装在所述导光板的一个边缘和所述导光板的在所述一个边缘对面的另一边缘上。
9.根据权利要求7所述的背光组件,其中所述发射单元包括两个发光二极管条,该两个发光二极管条分别安装在所述导光板的左边缘和右边缘上,或者分别安装在所述导光板的上边缘和下边缘上。
10.根据权利要求6所述的背光组件,其中所述白光发光二极管和所述量子点发光二极管以彼此交替的方式设置在所述导光板的后表面上。
11.一种显示装置,包括:
显示面板;和
背光单元,设置在所述显示面板的后表面上,所述背光单元包括导光板以及多个白光发光二极管和多个量子点发光二极管,所述导光板引导从所述背光单元发出的光朝向所述显示面板,所述多个白光发光二极管和量子点发光二极管沿着所述导光板布置以彼此交替。
12.根据权利要求11所述的显示装置,其中所述白光发光二极管的每个与所述量子点发光二极管的每个沿线交替。
13.根据权利要求11所述的显示装置,其中第一数量的白光发光二极管与第二数量的量子点发光二极管沿线交替。
14.根据权利要求13所述的显示装置,其中所述第一数量与所述第二数量相同。
15.根据权利要求13所述的显示装置,其中所述第一数量与所述第二数量不同。
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US9879843B2 (en) * | 2012-08-29 | 2018-01-30 | Axlen, Inc. | LED-based personal and other lighting devices and systems |
CN102901012B (zh) * | 2012-10-30 | 2014-12-10 | 京东方科技集团股份有限公司 | 背光模组及显示装置 |
KR20150105002A (ko) * | 2014-03-07 | 2015-09-16 | 엘지전자 주식회사 | 3차원 입체 영상 디스플레이 및 그 제어방법 |
KR20150117751A (ko) | 2014-04-10 | 2015-10-21 | 삼성디스플레이 주식회사 | 표시 장치 |
CN104820311B (zh) * | 2015-05-21 | 2018-02-27 | 武汉华星光电技术有限公司 | 背光模块和液晶显示器 |
CN105700230B (zh) * | 2016-01-29 | 2018-11-20 | 京东方科技集团股份有限公司 | 背光源、背光模组及显示装置 |
KR102615067B1 (ko) | 2016-12-05 | 2023-12-19 | 삼성전자주식회사 | 디스플레이 장치 |
CN110095867B (zh) * | 2018-01-31 | 2021-01-22 | 京东方科技集团股份有限公司 | 显示装置及方法、平视显示系统、交通工具和存储介质 |
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