CN109557719B - 一种具有半反半透导光板的直下式零od背光结构 - Google Patents

一种具有半反半透导光板的直下式零od背光结构 Download PDF

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CN109557719B
CN109557719B CN201811455265.5A CN201811455265A CN109557719B CN 109557719 B CN109557719 B CN 109557719B CN 201811455265 A CN201811455265 A CN 201811455265A CN 109557719 B CN109557719 B CN 109557719B
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覃佐波
刘莎莉
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Hefei Taiwo Intelligent Equipment Co ltd
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Abstract

本发明公开了一种具有半反半透导光板的直下式零OD背光结构，所述背板的上端面开设有矩形槽，所述矩形槽的内底壁涂有白色反射层，所述白色反射层上固定连接有LED光源，所述LED光源上固定有半反半透导光板，所述半反半透导光板上固定有下扩散膜，所述下扩散膜上固定有棱镜膜，所述棱镜膜上固定有上扩散膜，半反半透导光板使用PS材质，重量更低，成本更低，因光效雾度的提升，可相对应减少膜片，进一步降低成本。本发明具有侧入式轻薄的优点，总厚度不超过8mm，且遮蔽性优秀，OD趋近于0，可提升光的利用率，避免漏光，可实现曲面显示，符合轻薄的发展需求。本发明还具有直下式的优点，可实现分区调光，出光方式要比侧入式亮度更高。

Description

一种具有半反半透导光板的直下式零OD背光结构
技术领域
本发明涉及背光结构相关技术领域，具体涉及一种具有半反半透导光板的直下式零OD背光结构。
背景技术
背光结构是提供LCD显示器产品中的一个背光光源组件，一般有背光光源、多层背光材料以及支持框架组成，传统背光光源所发射出来的光在经过反射膜扩散膜后，只会有60％的光进入偏光膜，光损耗较高。常见的结构有直下式背光结构和侧入式背光结构。
直下式背光源工艺简单，不需要导光板，LED阵列置于灯箱底部，从LED发出的光经过底面和侧面反射，再通过表面的扩散膜和光学模组均匀射出。直下式背光源的厚度由灯箱底部和散射板的距离决定，通常厚度越厚，背光源的光均匀性就越好。在背光源较薄的情况下，色彩和亮度均匀性就成了直下式背光源的技术关键。直下式的好处是成本较低，且能够分别微调每个区域的LED灯的亮度，从而可以大幅度提高画面动态对比度。缺点也就是需使用数量较多的LED，厚度会比侧置式稍厚，现有的技术能将OD(Optical Distance)做到10mm，且无法弯曲，相对侧入式背光比较整体厚度是偏厚的。
所谓侧入式，是把LED晶粒配置在液晶荧屏的四周边缘，再搭配导光板，让LED背光源模组在发光时，把从荧幕边缘射出的光透过导光板输送到荧幕中央的区域去，这样整体就有足够的光通量，可让液晶荧幕清晰明亮的显示。其中导光板主要采用甲基丙烯酸甲酯PMMA、甲基丙烯酸甲酯-苯乙烯共聚物MS作为原料制造。优点是机身厚度较薄，可做成曲面。缺点是因光源置于导光板侧边，LED受颗数及亮度限制，仍需将光均匀分散整个平面上时，会形成当面板面积越大，光源辉度运用越有限，光学设计越困难，且制造成本较高昂，也无法分区控光。
发明内容
为了解决上述的技术问题，本发明的目的在于提供一种具有半反半透导光板的直下式零OD背光结构，通过结合直下式和侧入式背光的优点，并使用半反半透导光板，实现厚度缩小、重量减轻，降低成本、提升品质的目的。
本发明的目的可以通过以下技术方案实现：
一种具有半反半透导光板的直下式零OD背光结构，包括背板，所述背板的上端面开设有矩形槽，所述矩形槽的内底壁涂有白色反射层，所述白色反射层上固定连接有LED光源，所述LED光源上固定有半反半透导光板，所述半反半透导光板上固定有下扩散膜，所述下扩散膜上固定有棱镜膜，所述棱镜膜上固定有上扩散膜，所述上扩散膜的上方固定有液晶面板，所述液晶面板通过上盖板与背板固定连接。
进一步的，相邻的所述LED光源之间的间距相同。
进一步的，所述半反半透导光板为多层结构合成的复合导光板，且厚度不超过1.5mm。
进一步的，所述LED光源与背板的底板厚度之和不超过2.5mm。
进一步的，所述液晶面板和上盖板的厚度均不超过1.5mm。
进一步的，所述下扩散膜、棱镜膜和上扩散膜的厚度均不超过0.3mm。
进一步的，所述半反半透导光板为PS、PMMA、MS、PC、玻璃材质中的一种。
进一步的，所述半反半透导光板的下端面与LED光源的上端相抵触。
进一步的，所述背板、白色反射层和LED光源一体成型。
本发明的有益效果：
(1)半反半透导光板使用PS材质，相较于PMMA和MS，PC、玻璃材质，重量更低，成本更低，因光效雾度的提升，可相对应减少膜片，进一步降低成本。
(2)本发明具有侧入式轻薄的优点，总厚度不超过8mm，且遮蔽性优秀，OD趋近于0，可提升光的利用率，避免漏光，可实现曲面显示，符合轻薄的发展需求。
(3)本发明还具有直下式的优点，可实现分区调光，出光方式要比侧入式亮度更高，且出光均匀，效果好。
附图说明
下面结合附图对本发明作进一步的说明。
图1是本发明的结构示意图。
图中：背板1、白色反射层2、LED光源3、半反半透导光板4、下扩散膜5、棱镜膜6、上扩散膜7、液晶面板8、上盖板9。
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，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请参阅图1所示，本实施例提供了一种具有半反半透导光板的直下式零OD背光结构，包括背板1，背板1的上端面开设有矩形槽，矩形槽的内底壁涂有白色反射层2，白色反射层2上固定连接有LED光源3，背板1、白色反射层2和LED光源3一体成型。相邻的LED光源3之间的间距相同，呈均匀分布。LED光源3上固定有半反半透导光板4，半反半透导光板4通过与设置在背板1内的卡槽固定卡接，使半反半透导光板4的下端面与LED光源3的上端相接触，使OD趋近于0。半反半透导光板4为PS材质，半反半透导光板4上固定有下扩散膜5，下扩散膜5上固定有棱镜膜6，棱镜膜6上固定有上扩散膜7，上扩散膜7的上方固定有液晶面板8，液晶面板8通过上盖板9与背板1固定连接。
半反半透导光板4为多层结构合成的复合导光板，且厚度不超过1.5mm。
LED光源3与背板1的底板厚度之和不超过2.5mm。
液晶面板8和上盖板9的厚度均不超过1.5mm。
下扩散膜5、棱镜膜6和上扩散膜7的厚度均不超过0.3mm。
其中半反半透导光板4包括分光棱镜膜、LED光源，分光棱镜膜的下端面的纵截面呈锯齿状，分光棱镜膜的上端面开设有反射网点，用于使反射光向各个角度扩散，分光棱镜膜的上端面涂有反射层，反射层为涂布反射层，使光线发生全反射，涂布反射层上开设有穿透涂布反射层的出光网点，用于使光线穿过涂布反射层。以LED光源3为圆心，越靠近圆心的反射网点的密度越大，越远离圆心的反射网点的密度越小，提升光的均匀程度。以LED光源3为圆心，越靠近圆心的出光网点的密度越小，越远离圆心的出光网点的密度越大，使光均匀的从出光网点射出。
本实施例的工作过程：
LED光源3发出光线，经过半反半透导光板4对光的反射和部分全反射结合实现分光，使得光从半反半透导光板4上方均匀出光，随后均匀的光线依次穿过下扩散膜5、棱镜膜6和上扩散膜7，并最终为液晶面板8提供光源。半反半透导光板4使用PS材质，相较于其他材质，重量更低，成本更低，因光效雾度的提升，可相对应减少膜片，进一步降低成本。本发明具有侧入式轻薄的优点，总厚度不超过8mm，且遮蔽性优秀，OD趋近于0，可提升光的利用率，避免漏光，可实现曲面显示，符合轻薄的发展需求。本发明还具有直下式的优点，可实现分区调光，出光方式要比侧入式亮度更高。
以上内容仅仅是对本发明结构所作的举例和说明，所属本技术领域的技术人员对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，只要不偏离发明的结构或者超越本权利要求书所定义的范围，均应属于本发明的保护范围。

Claims (9)

1.一种具有半反半透导光板的直下式零OD背光结构，包括背板(1)，其特征在于，所述背板(1)的上端面开设有矩形槽，所述矩形槽的内底壁涂有白色反射层(2)，所述白色反射层(2)上固定连接有LED光源(3)，所述LED光源(3)上固定有半反半透导光板(4)，所述半反半透导光板(4)上固定有下扩散膜(5)，所述下扩散膜(5)上固定有棱镜膜(6)，所述棱镜膜(6)上固定有上扩散膜(7)，所述上扩散膜(7)的上方固定有液晶面板(8)，所述液晶面板(8)通过上盖板(9)与背板(1)固定连接；
半反半透导光板(4)包括分光棱镜膜，分光棱镜膜的下端面的纵截面呈锯齿状，分光棱镜膜的上端面开设有反射网点，用于使反射光向各个角度扩散，分光棱镜膜的上端面涂有反射层，反射层为涂布反射层，使光线发生全反射，涂布反射层上开设有穿透涂布反射层的出光网点，用于使光线穿过涂布反射层，以LED光源(3)为圆心，越靠近圆心的反射网点的密度越大，越远离圆心的反射网点的密度越小。
2.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，相邻的所述LED光源(3)之间的间距相同。
3.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述半反半透导光板(4)为多层结构合成的复合导光板，且厚度不超过1.5mm。
4.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述LED光源(3)与背板(1)的底板厚度之和不超过2.5mm。
5.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述液晶面板(8)和上盖板(9)的厚度均不超过1.5mm。
6.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述下扩散膜(5)、棱镜膜(6)和上扩散膜(7)的厚度均不超过0.3mm。
7.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述半反半透导光板(4)为PS、PMMA、MS、PC、玻璃材质中的一种。
8.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述半反半透导光板(4)的下端面与LED光源(3)的上端相抵触。
9.根据权利要求1所述的一种具有半反半透导光板的直下式零OD背光结构，其特征在于，所述背板(1)、白色反射层(2)和LED光源(3)一体成型。
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