PLANAR ILLUMINATION DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE USING SAME

摘要

A planar illumination device is provided with a laser light source, a light guide plate for projecting light incident on its edge from its first main surface, an optical element for disposing divergent light from the laser light source in substantially parallel with each other in a direction of thickness of the light guide plate to project the substantially parallel light toward the edge of the light guide plate, and a first light deflecting unit for deflecting a propagating direction of the light incident on the light guide plate. The first light deflecting unit changes the degree of its light deflecting amounts of the light incident on the light guide plate in accordance with places in the light guide plate, so that a light amount projected from the first main surface can be uniform in the first main surface.