CN105700230A - 背光源、背光模组及显示装置 - Google Patents
背光源、背光模组及显示装置 Download PDFInfo
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Abstract
本发明公开了一种背光源、背光模组及显示装置。其中,该背光源包括:光条,以及按照预定间隔排列方式设置在所述光条上的第一光源和第二光源,其中,所述第一光源采用第一荧光粉,所述第二光源采用第二荧光粉,所述第二荧光粉与所述第一荧光粉不同。通过本发明,无需采用重新调制荧光粉制作背光源的方式即可满足特定色域值的显示要求,避免了调制新的荧光粉导致的产品开发周期变长,以及降低产品生产效率。
Description
技术领域
本发明涉及显示技术领域,尤其是涉及一种背光源、背光模组及显示装置。
背景技术
液晶面板中,背光源多采用直下式背光源或侧入式背光源,这两种背光源使用蓝光LED(Light-EmittingDiode,发光二极管)激发不同荧光粉以达到白光的效果,并实现不同的色域。常用的荧光粉有Y(黄色)粉,YR(黄红色)粉,RG(红绿色)粉,KSF(氟硅酸钾)。目前,同一BLU(BacklightUnit,背光模组)上面的LED灯使用同一种荧光粉,通过和彩膜搭配显示不同的色域。通常,使用Y粉一般可以实现62%NTSC(NationalTelevisionStandardsCommittee,美国国家电视标准委员会)色域,使用YR粉一般可以实现72%NTSC色域,使用RG粉一般可以实现82%NTSC色域,使用KSF则一般可以实现大于100%NTSC色域。
但是,当需要使用某个特定值(例如78%)的NTSC色域时,或者当彩膜具有特殊情况时,使用一种荧光粉可能达不到要求的色域,而使用另一种荧光粉可能会超过要求的色域,此时只能重新调制荧光粉,这必然将导致产品开发周期变长,降低产品生产效率。
发明内容
本发明的主要目的在于提供一种在有特定色域值要求而单一荧光粉无法满足要求的情况下,无需重新调制新的荧光粉重新制作背光源即可达到满足特定色域值的要求的技术方案。
为了达到上述目的,根据本发明的一个方面,提供了一种背光源,包括:光条,以及按照预定间隔排列方式设置在所述光条上的第一光源和第二光源,其中,所述第一光源采用第一荧光粉,所述第二光源采用第二荧光粉,所述第二荧光粉与所述第一荧光粉不同。
优选地,所述第一光源和所述第二光源均为发光二极管(LED)。
优选地,所述第一光源和所述第二光源采用一一交替间隔排列方式设置在所述光条上。
优选地,所述第一荧光粉和所述第二荧光粉的类型包括:Y荧光粉、YR荧光粉、RG荧光粉,或KSF荧光粉。
优选地,所述第一荧光粉为YR荧光粉,且所述第二荧光粉为RG荧光粉。
根据本发明的另一个方面,提供了一种背光模组,该背光模组包括导光板和上述背光源。
优选地,所述导光板的反光面上对应于所述背光源的第一光源的位置、且靠近入光面处设置有多个第一网点,所述导光板的反光面上对应于所述背光源的第二光源的位置、且靠近入光面处设置有多个第二网点。
优选地,所述第一光源采用的第一荧光粉为YR粉,所述第二光源采用的第二荧光粉为RG粉,所述第一网点具有用于将所述第一光源的入射光向所述导光板出光面反射的第一反射面,所述第二网点具有用于将所述第二光源的入射光向所述导光板出光面反射的第二反射面,多个所述第一网点的所述第一反射面面积之和小于多个所述第二网点的所述第二反射面面积之和。
优选地,所述第一网点和所述第二网点的表面均为部分球面。
优选地,所述第一网点的直径小于所述第二网点的直径。
优选地,按照距离所述第一光源的从近到远,所述第一网点的个数逐渐减小;按照距离所述第二光源的从近到远,所述第二网点的个数逐渐减小。
根据本发明的又一个方面,提供了一种显示装置,该显示装置包括上述背光模组。
与现有技术相比,本发明所述的背光源、背光模组及显示装置,在有特定色域值要求而单一荧光粉无法满足要求的情况下,无需重新调制新的荧光粉重新制作背光源即可达到满足特定色域值的要求,从而避免了重新调制新的荧光粉重新制作背光源导致的产品开发周期变长,产品生产效率过低。
附图说明
图1是根据本发明实施例的背光源的结构示意图;以及
图2是根据本发明实施例的背光源的局部放大示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域的普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例,都属于本发明保护的范围。
由于目前的LED灯只能使用同一种荧光粉,而常用的几种荧光粉诸如Y粉、YR粉、RG粉以及KSF粉可以实现的色域范围并不相同,这容易导致要求实现的某个特定色域值刚好没有落在这几种荧光粉可以实现的色域值范围内,此时只能重新调制荧光粉以达到满足该特定色域值的目的,但是将重新调制完荧光粉后,再重新制作LED灯条最终得到背光源,显然这个过程很长,而如果没遇到这种情况都要重新操作,必然增加新产品的开发周期,降低产品的生产效率。
为了解决这种问题,本发明通过混合打件的方式将使用不同荧光粉的LED封装在光条(Lightbar)上,从而可以实现不同色域值需求的背光模组,进而满足不同的色域显示需求。
基于此,本发明实施例提供了一种背光源,该背光源可以包括有光条,以及按照预定间隔排列方式设置在所述光条上的第一光源和第二光源,其中,所述第一光源采用第一荧光粉,所述第二光源采用第二荧光粉,所述第二荧光粉与所述第一荧光粉不同。
由于第一光源和第二光源分别采用了不同的荧光粉,而每种荧光粉能够实现不同的色域范围,因此同时集成有多个所述第一光源和多个所述第二光源的灯条可以实现两个不同色域范围之间的特定色域值。
作为一个优选示例,所述第一光源和所述第二光源均可以为发光二极管(LED)。当然,在实际应中并不以此为限制,任何采用荧光粉发光实现不同发光效果原理的光源都是适用的。
在本发明实施例中,所述第一光源和所述第二光源的设置方式可以是多样化的,例如,M个所述第一光源连续设置后,再设置N个连续的所述第二光源,例如,3个所述第一光源连续设置与2个所述第二光源间隔设置,并依此重复,当然,也可以是杂乱间隔设置,只要是间隔设置的方式,也就是说只要达到混合所述第一光源和所述第二光源的目的即可。
进一步地,作为间隔设置方式的一个优选实施方式,可以采用一一交替间隔排列方式设置在所述光条上。显然,采用这种一一间隔设置方式排列后的所述第一光源和所述第二光源,最终实现的色域更加均匀,从显示效果来说则更加柔和,从而提高观看者的体验度。
在本发明实施例中,所述第一荧光粉和所述第二荧光粉的类型均可以包括:Y荧光粉、YR荧光粉、RG荧光粉,或KSF荧光粉。也就是说,本发明实施例中,均可以将目前常用的荧光粉进行两两混合,从而实现不同的色域值范围。
需要说明的是,关于是否有必要对这些常用的荧光粉的三种或更多种进行混合,实际应用中并不作出限定,但是这样做的意义并不大,这是因为如果需要混合三种荧光粉才能达到要求显示的色域值,该色域值必然属于三种荧光粉的色域范围的中间值,基本上采用中间色域值范围的一种荧光粉就可以达到显示目的。
作为一个优选示例,所述第一荧光粉为YR荧光粉,且所述第二荧光粉为RG荧光粉。当然,这只是一个优选实施方式,在实际应用中,可能需要混合这两种粉以达到显示目的情况比较多,但本发明实施例并不对其他混合种类作出任何限定。
为便于理解,请结合图1进行参考(图1是根据本发明实施例的背光源的结构示意图),如图1所示,光条上同时集成了两种LED,即A型LED(即所述第一光源)和B型LED(即所述第二光源),这两种类型的LED由于使用了不同荧光粉,其发出光的色域值范围是不同的,导致最终进入导光板(LGP)的综合光的色域值是单独的A型LED或B型LED所不能达到的。
可以看出,本发明实施例提出的这种可调节色域的新型背光源,将使用两种不同的粉种的LED交叉打件在同一光条上,例如,混合Y粉&YR粉,可实现色域68%,通过不同的荧光粉和彩膜基板的搭配,来实现不同的色域值。
在上述背光源的基础上,本发明实施例还进一步提供了一种背光模组,该背光模组包括导光板和上述背光源,基于上述背光源的改进所在,该背光模组的改进也主要在于此。
但是,由于不同荧光粉被相同的发光二极管芯片的激发效率不同,因此,前述第一光源和第二光源的亮度也不同,采用YR粉的第一光源亮度比采用RG粉的第二光源的亮度高出12%~15%,如此设置会使得导光板靠近各光源位置处(即第一光源与第二光源入射的光未发生混光或混光很少的位置)亮度不均匀,进而会导致画面发生Hotspot(萤火虫)现象,为了解决此问题,本发明实施例提供的背光模组中,还进一步进行了如下改进设计:
请参考图1,在所述导光板的反光面上对应于所述背光源的第一光源(即A型LED)的位置、且靠近入光面处设置有多个第一网点,所述导光板的反光面上对应于所述背光源的第二光源(即B型LED)的位置、且靠近入光面处设置有多个第二网点。采用这种网点设计方式,可以将所述第一光源和所述第二光源射入导光板的入光面的光线均匀地打散。
优选的,基于前面对背光源的描述,所述第一光源采用的第一荧光粉可以为YR粉,所述第二光源采用的第二荧光粉可以为RG粉。
第一网点具有用于将第一光源的入射光向所述导光板出光面反射的第一反射面,所述第二网点具有用于将第二光源的入射光向所述导光板出光面反射的第二反射面;多个所述第一网点的第一反射面面积之和小于多个第二网点的所述第二反射面面积之和;如此设置,可调节两种光源在上述导光板靠近各光源位置处的亮度,使亮度更加均匀,尽可能减小或避免萤火虫现象。
作为一个优选示例,所述第一网点和所述第二网点的表面可以均设计为部分球面,当然这是由于球面状网点对光线的反射更为均匀,分散效果更好,而在实际应用中,不规则表面的其它凸起状网点基本上都是可以实现对光的散光作用的,使得散射后的光线更加柔和均匀。
进一步地,请参考图2(图2是根据本发明实施例的背光源的局部放大示意图),如图2所示,所述第一网点的直径(R1)小于所述第二网点的直径(R2)。由于第一网点的球面直径较小,所有第一网点形成的光反射面较小,因此第一网点可以将所述第一光源通过YR粉发出的亮度较大的光反射得并不多,由于第二网点的球面直径较大,所有第二网点形成的光反射面较大,因此所述第二网点可以将所述第二光源通过RG粉发出的亮度较小的光反射的比较多,这样以来,靠近第一光源(即A型LED)的位置的光亮度与靠近第二光源(即B型LED)的位置的光亮度更加均匀。
而且,如图2所示,按照距离所述第一光源的从近到远,所述第一网点的个数逐渐减小,按照距离所述第二光源的从近到远,所述第二网点的个数逐渐减小。基于此种设计,可以使得A型LED和B型LED发出的光线不会在距离导光板入光面很近的地方就发生混光现象,从而更大程度上避免萤火虫现象的发生。
可以看出,在导光板的反射面加工成若干个小的网点状的表面,可以通过这些网点将光打散均匀化。
基于上述背光模组,本发明实施例还提供了一种显示装置,该显示装置包括上述背光模组。
如图1或2中,以A型LED(例如,使用YR粉)和B型LED(例如,使用RG粉)交替打件的顺序排列在PCB上形成整条光条上,最终可以得到以下测试数据:
从这些测试数据可以看出,这种混合使用不同荧光粉的光源并集成在整个灯条上的方式,最终得到的色域值完全能够满足不同的显示需求。
通过本发明实施例,当所要求的特定色域值为仅使用一种荧光粉达不到的色域值,而仅使用另一种荧光粉则会的色域值时,将采用这两种荧光粉的光源混合打制在灯条上的方式即可实现该特定色域值,从而满足相应显示装置的显示要求,而无需重新调节新粉,从而可以达到节约成本和开发时间的效果。
以上所述是本发明的优选实施方式,应当指出,对于本领域的普通技术人员来说,在不脱离本发明所述原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为包含在本发明的保护范围之内。
Claims (12)
1.一种背光源,其特征在于,包括:
光条,以及按照预定间隔排列方式设置在所述光条上的第一光源和第二光源,其中,所述第一光源采用第一荧光粉,所述第二光源采用第二荧光粉,所述第二荧光粉与所述第一荧光粉不同。
2.根据权利要求1所述的背光源,其特征在于,所述第一光源和所述第二光源均为发光二极管LED。
3.根据权利要求1所述的背光源,其特征在于,所述第一光源和所述第二光源采用一一交替间隔排列方式设置在所述光条上。
4.根据权利要求1至3中任一项所述的背光源,其特征在于,所述第一荧光粉和所述第二荧光粉的类型包括:
Y荧光粉、YR荧光粉、RG荧光粉,或KSF荧光粉。
5.根据权利要求4所述的背光源,其特征在于,所述第一荧光粉为YR荧光粉,且所述第二荧光粉为RG荧光粉。
6.一种背光模组,其特征在于,包括导光板和权利要求1至5中任一项所述的背光源。
7.根据权利要求6所述的背光模组,其特征在于,所述导光板的反光面上对应于所述背光源的第一光源的位置、且靠近入光面处设置有多个第一网点,所述导光板的反光面上对应于所述背光源的第二光源的位置、且靠近入光面处设置有多个第二网点。
8.根据权利要求7所述的背光模组,其特征在于,所述第一光源采用的第一荧光粉为YR粉,所述第二光源采用的第二荧光粉为RG粉,所述第一网点具有用于将所述第一光源的入射光向所述导光板出光面反射的第一反射面,所述第二网点具有用于将所述第二光源的入射光向所述导光板出光面反射的第二反射面,多个所述第一网点的所述第一反射面面积之和小于多个所述第二网点的所述第二反射面面积之和。
9.根据权利要求8所述的背光模组,其特征在于,所述第一网点和所述第二网点的表面均为部分球面。
10.根据权利要求8所述的背光模组,其特征在于,所述第一网点的直径小于所述第二网点的直径。
11.根据权利要求7至10中任一项所述的背光模组,其特征在于:
按照距离所述第一光源的从近到远,所述第一网点的个数逐渐减小;
按照距离所述第二光源的从近到远,所述第二网点的个数逐渐减小。
12.一种显示装置,其特征在于,包括权利要求6至11中任一项所述的背光模组。
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