公开(公告)号：US06199995B1

公开(公告)日：2001-03-13

申请号：US09258256

申请日：1999-02-26

申请人： Seiji Umemoto ,  Shuji Yano

发明人： Seiji Umemoto ,  Shuji Yano

IPC分类号： F21V704

CPC分类号： G02B6/0038 ,  G02B6/0046 ,  G02F2001/133616

摘要： A light guide plate in which the light incident on an entrance end surface is allowed to emerge from a bottom surface view a light issuing means formed on a top surface, with the direction of maximum intensity of the emerging light as measured in a plane perpendicular to the two reference planes defined by said entrance end surface and said bottom surface being within 30 degrees from the line normal to said bottom surface and wherein when the direction toward the entrance end surface away from said normal line taken as the reference is assumed to be negative, the intensity of the light leaking from the top surface at the same angle as the direction of said maximum intensity is no more than a tenth of said maximum intensity, with the incident light from the bottom surface being transmitted through the top surface; a planer light source unit having a light source adjacent the entrance end surface of the light guide plate; and a reflection-type liquid-crystal display device having a reflective layer furnished, liquid-crystal cell provided beneath the bottom surface of the planer light source unit.

摘要翻译： 导光板，其中从入射端面入射的光从底面观察出，形成在上表面上的发光装置，其中出射光的最大强度的方向在垂直于 由所述入口端面和所述底表面限定的两个参考平面距离所述底表面垂直的线30度内，并且当朝向作为基准的所述法线的入口端表面的方向假设为负时 以与所述最大强度的方向相同的角度从顶表面泄漏的光的强度不大于所述最大强度的十分之一，其中来自底表面的入射光透过顶表面; 具有与所述导光板的入射端面相邻的光源的平面光源单元; 以及具有反射层的反射型液晶显示装置，设置在平面光源单元的底面下方的液晶单元。