Patent ID: 7440049

Claim:
A backlight device for a liquid crystal display, comprising at least a light diffuser plate, a light source disposed at a backside of the light diffuser plate, and a reflector for reflecting light from the light source, wherein a liquid crystal panel is disposed at a frontside of the light diffuser plate, and direct light from said light source and reflected light from said reflector diffuse into and transmit through said light diffuser plate to illuminate said liquid crystal panel from backside, said backlight device for a liquid crystal display being configured such that: said light source radiates ultraviolet rays and heat along with visual light, and said light diffuser plate is constrained at at least one side thereof, and has a saturated water absorption rate of not more than 0.9% as well as a color difference (AE) of not greater than 2.0 as specified in JIS K 7105 after being exposed for 500 hours to an artificial light used for an artificial light source test specified in JIS K7350-2.