公开(公告)号：US06636283B2

公开(公告)日：2003-10-21

申请号：US09819624

申请日：2001-03-29

申请人： Tomohiro Sasagawa ,  Kyoichiro Oda ,  Akimasa Yuuki ,  Naoto Sugawara ,  Masahiro Yokoi ,  Masahisa Moroda

发明人： Tomohiro Sasagawa ,  Kyoichiro Oda ,  Akimasa Yuuki ,  Naoto Sugawara ,  Masahiro Yokoi ,  Masahisa Moroda

IPC分类号： G02F11335

CPC分类号： G02B6/0018 ,  G02B6/002 ,  G02B6/0028 ,  G02B6/0036 ,  G02B6/0038 ,  G02B6/0061

摘要： A compact and light weight front light, a reflective liquid crystal display device, and a personal digital assistant providing an image display of uniform brightness with high efficiency are provided. The front light includes a main optical guide plate and a second optical guide plate. The second optical guide plate is arranged at an end of the main optical guide plate along the widthwise direction, and, on an end surface opposite an end surface facing the main optical guide plate, grooves forming prisms are aligned along the longitudinal direction, extending in the depth direction. The front light further includes a point light source arranged at an end, in the longitudinal direction, of the second optical guide plate, and a reflective film covering the surfaces of the grooves.

摘要翻译： 提供了一种紧凑且重量轻的前灯，反射型液晶显示装置和提供高效均匀亮度的图像显示的个人数字助理。 前灯包括主导光板和第二导光板。 第二导光板沿宽度方向配置在主导光板的端部，在与主导光板相对的端面相对的端面上，形成棱镜的槽沿着长度方向排列， 深度方向。 前灯还包括布置在第二导光板的纵向端部的点光源和覆盖凹槽表面的反射膜。