CN107300805A - 一种量子点和yag荧光粉混掺的液晶显示屏 - Google Patents
一种量子点和yag荧光粉混掺的液晶显示屏 Download PDFInfo
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Abstract
本发明涉及液晶显示技术领域,具体涉及一种量子点和YAG荧光粉混掺的液晶显示屏,所述光源结构由实心散热铝壳(1)、PCB电路板(2)和蓝光LED(3)构成,所述实心散热铝壳(1)为条状槽形,所述蓝光LED(3)通过PCB电路板(2)安装在实心散热铝壳的槽形底部,实心散热铝壳(1)的槽口设有透光玻璃(12),所述导光板(5)的光线射出口上设置有量子点膜(4),量子点膜(4)内分布有量子点和黄色荧光粉。本发明提高了色域宽度,可达到110%;另外,本发明中量子点膜设置在反射板上,与光源结构分为两部分,可有效的隔离光源结构所散的热,进一步降低量子点因温度变化而不稳定。
Description
技术领域
本发明涉及液晶显示技术领域,具体涉及一种量子点和YAG荧光粉混掺的液晶显示屏。
背景技术
量子点(quantum
dot)是准零维(quasi-zero-dimensional)的纳米材料,由少量的原子所构成。粗略地说,量子点三个维度的尺寸都在100纳米(nm)以下,外观恰似一极小的点状物,其内部电子在各方向上的运动都受到局限,所以量子限域效应(quantum confinement effect)特别显著。
液晶电视的色域取决于背光的光谱特性、以及光谱与液晶面板彩色滤光片(CF)的匹配程度。背光光源只要白光,白光再经过滤光片就可以得到任何想要的颜色,如果白光色域够高则得出的液晶电视色域也会高。目前行业普遍采用NTSC色域标准来衡量色彩显示效果,色域覆盖率(简称色域)越高,电视所呈现的颜色范围也就越丰富、越接近自然色。
传统的WLED电视大多采用“蓝光LED+黄色荧光粉”的发光模式(通过蓝光LED发出的光激发黄色荧光粉产生黄光,剩余的蓝光与黄光混色而获得白光,就RGB三基色而言,其色纯度很差),虽可让人感觉到白光,不过缺乏红光和绿光使得混色较为困难,是导致色域覆盖率偏低和背光转换效率不高的原因。一般色域覆盖率(简称色域)不超过72%,目前大多数液晶显示器(电视或者手机)都采用这种发光模式。
现有技术中,采用量子点发光的技术主流,主要是是利用蓝光LED发出的光激发两种量子点(红光量子点和绿光量子点)材料,分别发出红光和绿光,并同剩余的蓝光混色成为白光,这种白光就作为液晶电视的背光光源。这种白光出来的色域可以达到110%,量子点液晶显示的色域和能效更高,所以其画面色彩更自然亮丽,并且兼顾节能环保。
但是目前量子点的成本很高,而且量子点会因为温度高等环境因素存在一定不稳定性,稳定性差的缺点,表现最明显的是目前电子设备尤其手机等设备,在使用过程中可能存在一定的高温环境,这样量子点的发光光源则极不稳定。
发明内容
本发明的目的在于提供一种量子点和YAG荧光粉混掺的液晶显示屏,解决了现有的液晶显示发光模式使用“蓝光LED+黄色荧光粉”的发光模式,色域不够宽,而采用量子点发光,又容易受使用环境的影响,尤其是温度的影响,导致光源不稳定,并且全部使用量子点成本很高的问题。
为解决上述的技术问题,本发明采用以下技术方案:
一种量子点和YAG荧光粉混掺的液晶显示屏,
所述光源结构由实心散热铝壳、PCB电路板、蓝光LED和量子点膜构成,所述实心散热铝壳为条状槽形,所述蓝光LED通过PCB电路板安装在实心散热铝壳的槽形底部,实心散热铝壳的槽口设有透光玻璃;
所述显示装置由导光板、光学膜片和反射板构成,所述光学膜片和反射板设置在导光板的相对两侧,所述导光板的光线射出口上设置有量子点膜,量子点膜内分布有量子点和黄色荧光粉;
所述蓝光LED发出的蓝光经过导光板和反射板后射在量子点膜得到混合白光,混合白光从导光板的侧面进入导光板,并在光导入光学膜片上实现显像。
进一步的,所述实心散热铝壳内的槽壁为平面的铝镜面,所述铝镜面将蓝光LED发出的蓝光向同一个方向折射。
进一步的,所述量子点膜由红光量子点、绿光量子点和黄色荧光粉构成,所述蓝光LED所发的蓝光分别进入五个通道,所述五个通道中有三个通道分别是通向红光量子点、绿光量子点和黄色荧光粉,另外两个通道为蓝光直通道,红光量子点发出的红光、绿光量子点发出的部分绿光和一个蓝光直通道的蓝光混合成为第一混合白光进入第一白光通道,另一个蓝光直通道的蓝光和经过黄色荧光粉的第二混合黄光混合后得到的第二混合白光进入第二白光通道,第一白光通道的第一混合白光和第二白光通的第二混合白光相汇得到稳定白光光谱。
进一步的,所述量子点膜是通过固晶胶粘贴固定在导光板的光线射出口上的。
与现有技术相比,本发明的有益效果是:相对传统的WLED发光光源极大的提高了色域宽度,可达到110%,而且也弥补了量子点光源存在不稳定的因素;解决了单纯使用量子点输出白光的不稳定性造成其色稳定性较差、成本较高的缺点;以及单蓝光光源加荧光粉合成白光光源,白光显色域偏低等问题,以及全量子点修整的高成本问题;另外,本发明中量子点膜设置在反射板上,与光源结构分为两部分,可有效的隔离光源结构所散的热,进一步降低量子点因温度变化而不稳定。
附图说明
图1为本发明一种量子点和YAG荧光粉混掺的液晶显示屏的结构示意图。
图2为图1中A-A的剖面示意图。
图3为本发明一种量子点和YAG荧光粉混掺的液晶显示屏的量子点膜光线变化示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。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。
图1和图2示出了本发明一种量子点和YAG荧光粉混掺的液晶显示屏的一个实施例:一种量子点和YAG荧光粉混掺的液晶显示屏,所述光源结构由实心散热铝壳1、PCB电路板2和蓝光LED3构成,所述实心散热铝壳1为条状槽形,所述蓝光LED3通过PCB电路板2安装在实心散热铝壳1的槽形底部,实心散热铝壳1的槽口设有透光玻璃12;所述显示装置由导光板5、光学膜片6和反射板7构成,所述光学膜片6和反射板7设置在导光板5的相对两侧,所述导光板5的光线射出口上设置有量子点膜4,量子点膜4内分布有量子点和黄色荧光粉;所述蓝光LED3发出的蓝光经过导光板5和反射板7后射在量子点膜4得到混合白光,混合白光从导光板5的侧面进入导光板5,并在光导入光学膜片6上实现显像。反射板7设置是为了将从导光板5下底面射出的光线重新反射到导光板上。
根据本发明一种量子点和YAG荧光粉混掺的液晶显示屏的另一个实施例,所述实心散热铝壳1内的槽壁为平面的铝镜面11,所述铝镜面11将蓝光LED3发出的蓝光向同一个方向折射。
图3示出了本发明一种量子点和YAG荧光粉混掺的液晶显示屏的另一个实施例,所述量子点膜4由红光量子点8、绿光量子点9和黄色荧光粉10构成,所述蓝光LED3所发的蓝光分别进入五个通道,所述五个通道中有三个通道分别是通向红光量子点8、绿光量子点9和黄色荧光粉10,另外两个通道为蓝光直通道,红光量子点8发出的红光R、绿光量子点9发出的部分绿光G和一个蓝光直通道的蓝光B混合成为第一混合白光W1进入第一白光通道,另一个蓝光直通道的蓝光B和经过黄色荧光粉10的第二混合黄光Y2混合后得到的第二混合白光W2进入第二白光通道,第一白光通道的第一混合白光W1和第二白光通的第二混合白光W2相汇得到稳定白光光谱W。
尽管这里参照本发明的多个解释性实施例对本发明进行了描述,但是,应该理解,本领域技术人员可以设计出很多其他的修改和实施方式,这些修改和实施方式将落在本申请公开的原则范围和精神之内。更具体地说,在本申请公开、附图和权利要求的范围内,可以对主题组合布局的组成部件和/或布局进行多种变型和改进。除了对组成部件和/或布局进行的变形和改进外,对于本领域技术人员来说,其他的用途也将是明显的。
Claims (4)
1.一种量子点和YAG荧光粉混掺的液晶显示屏,包括光源结构和显示装置,其特征在于:所述光源结构由实心散热铝壳(1)、PCB电路板(2)和蓝光LED(3)构成,所述实心散热铝壳(1)为条状槽形,所述蓝光LED(3)通过PCB电路板(2)安装在实心散热铝壳(1)的槽形底部,实心散热铝壳(1)的槽口设有透光玻璃(12);
所述显示装置由导光板(5)、光学膜片(6)和反射板(7)构成,所述光学膜片(6)和反射板(7)设置在导光板(5)的相对两侧,所述导光板(5)的光线射出口上设置有量子点膜(4),量子点膜(4)内分布有量子点和黄色荧光粉;
所述蓝光LED(3)发出的蓝光经过导光板(5)和反射板(7)后射在量子点膜(4)得到混合白光,混合白光从导光板(5)的侧面进入导光板(5),并在光导入光学膜片(6)上实现显像。
2.根据权利要求1所述的一种量子点和YAG荧光粉混掺的液晶显示屏,其特征在于:所述实心散热铝壳(1)内的槽壁为平面的铝镜面(11),所述铝镜面(11)将蓝光LED(3)发出的蓝光向同一个方向折射。
3.根据权利要求1所述的一种量子点和YAG荧光粉混掺的液晶显示屏,其特征在于:所述量子点膜(4)由红光量子点(8)、绿光量子点(9)和黄色荧光粉(10)构成,所述蓝光LED(3)所发的蓝光分别进入五个通道,所述五个通道中有三个通道分别是通向红光量子点(8)、绿光量子点(9)和黄色荧光粉(10),另外两个通道为蓝光直通道,红光量子点(8)发出的红光(R)、绿光量子点(9)发出的部分绿光(G)和一个蓝光直通道的蓝光(B)混合成为第一混合白光(W1)进入第一白光通道,另一个蓝光直通道的蓝光(B)和经过黄色荧光粉(10)的第二混合黄光(Y2)混合后得到的第二混合白光(W2)进入第二白光通道,第一白光通道的第一混合白光(W1)和第二白光通的第二混合白光(W2)相汇得到稳定白光光谱(W)。
4.根据权利要求1所述的一种量子点和YAG荧光粉混掺的液晶显示屏,其特征在于:所述量子点膜(4)是通过固晶胶粘贴固定在导光板(5)的光线射出口上的。
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