| 摘要 |
A light guide plate (1) in which the light incident on an entrance end surface (13) is redirected to emerge from a bottom surface (12) via triangular prism structures formed on a top surface (11), with the direction of maximum intensity of the light emerging from the bottom surface (12) being within 30 degrees from the line normal to said bottom surface (12). The intensity of the light leaking from the top surface (11) at the same angle as the direction of said maximum intensity is no more than a tenth of said maximum intensity in order to give high contrast. A light source is arranged adjacent the entrance end surface of the light guide plate and a reflection-type liquid-crystal display device is provided beneath the bottom surface (12). Light emerging from the bottom surface (12) is reflected by the liquid crystal cell and is transmitted through the light guide plate (1) to be viewed from the top surface. The light guide plate (1) allows ambient light to also illuminate the display device. <IMAGE> |
