Patent ID: 7394960

Claim:
A backlight unit of a display module, the backlight unit being disposed at a lower side of a liquid-crystal display module and having a case that accommodates a light tube as a source of light incident on the display module, a lamp reflector that accommodates the light tube, and an optical waveguide having an approximately square shape in the surface that converts linear light generated from the light tube and light of the linear light reflected from the lamp reflector into planar light, and inputs the planar light to the display module, wherein the lamp reflector is made of metal, and has stoppers provided at first parts facing respective ends of a side surface of the optical waveguide opposite to the light tube, oriented in a direction parallel to a longitudinal direction of the light tube and at positions closer to the optical waveguide than to a second part, extending between the first parts and facing the side surface of the optical waveguide, excluding the first parts.