Front light, reflective liquid crystal display device and personal digital assistant

摘要

A compact and light weight front light, a reflective liquid crystal display device and a personal digital assistant providing 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 portion of the main optical guide plate along the widthwise direction, and on an end surface opposite to an end surface facing the main optical guide plate, a plurality of prism- shaped grooves are formed 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 surface of the prism-shaped grooves.