| 摘要 |
PURPOSE:To increase the brightness of the lighting device for liquid crystal. CONSTITUTION:Many small recessed parts 18 are formed in the light projection surface 16 and light reflection surface 17 of a light guide plate 11 and the light in the light guide plate 11 is projected perpendicularly to a liquid crystal display plate to increase the brightness on a lighted surface. A light diffusion layer 19 which has a higher refractive index than the light guide body 11 is formed on the surface of the light guide body 11 which is made large in area by the small recessed parts 18 and the formation area of the light diffusion layer 19 is made large to increase the light scattering performance. The formation density of the light scattering layer 19 is gradually increased with the distance from a light source 12 to increase the scattering performance of the center part of the light guide plate 11 where the brightness is easy to decrease. |
