-
公开(公告)号：US5202950A
公开(公告)日：1993-04-13
申请号：US764427
申请日：1991-09-23
IPC分类号： F21V7/00 , F21V8/00 , G02B6/00 , G02B6/04 , G02F1/13357
CPC分类号： G02B6/0046 , F21V7/00 , G02B6/0048 , G02B6/0055 , G02F1/133615 , G02B6/0001 , Y10S385/901
摘要： A light pipe used for backlighting liquid crystal displays has a planar front surface and a stair-stepped or faceted back surface. Light is injected from the ends of the light pipe from cold- or hot-cathode, apertured, fluorescent lamps. The cold-cathode lamps are preferably insulated to raise their operating temperature. The back surface has a series of planar portions parallel to the front surface connected by facets, which are angled so that the injected light reflects off the facets and through the front surface. A reflector having a planar, highly reflective, highly scattering surface or a sawtoothed or grooved upper surface in located adjacent to and parallel with the light pipe back surface to reflect light escaping from the back surface back through the light pipe to exit the front surface. The axis of grooves is preferably slightly skewed from the facet axis to reduce moire pattern development. A low-scattering or low-loss diffuser is located adjacent to and parallel with the light pipe front surface to reduce moire pattern development. The liquid crystal display is located over the low scattering diffuser. A separate injector may be located between the lamp and the light pipe to better couple the light into the light pipe. Light pipes may be stacked to provide a backlight system having increased brightness and/or greater viewing angle.
摘要翻译： 用于背光液晶显示器的光管具有平坦的前表面和阶梯式或刻面的后表面。 光从光管的端部从冷或热阴极，有孔荧光灯注入。 冷阴极灯优选被绝缘以提高它们的工作温度。 后表面具有平行于与由小平面连接的前表面的一系列平面部分，该平面部分成角度，使得注入的光从小平面反射并穿过前表面。 具有平面，高反射性，高散射表面或锯齿状或带槽的上表面的反射器，其位于与光管背表面相邻且平行的位置，以反射从后表面逸出的光通过光管返回以离开前表面。 凹槽的轴线优选地从小面轴稍微偏斜以减少波纹图案显影。 低散射或低损耗漫射器位于光管正面附近并与光管前表面平行，以减少波纹图案的发展。 液晶显示器位于低散射漫射器的上方。 单独的注射器可以位于灯和光管之间，以更好地将光耦合到光管中。 光管可以被堆叠以提供具有增加的亮度和/或更大视角的背光系统。
搜索结果
1 条记录 (耗时 0.013 秒)
