EDGE-LIGHT TYPE PLANAR LIGHT SOURCE DEVICE

摘要

The present invention achieves sufficient and even brightness across the entire illumination surface of a light guide plate and reduces costs. LED light source substrates (140a and 140b) are configured to emit light having a slight gradient of brightness at the edge of a region to be irradiated with light instead of light having approximately even brightness on the entire region to be irradiated with light.