Patent ID: 7954969

Claim:
An illuminating device for a liquid crystal panel which illuminates a transmissive liquid crystal panel from behind, said illuminating device comprising: a plurality of straight-tube type discharge lamps arranged roughly parallel to a back surface of the liquid crystal panel, a reflecting plate disposed behind said discharge lamps to reflect light emitted from said discharge lamps forward, a plate-shaped diffuser plate disposed between said liquid crystal panel and said discharge lamps to diffuse incident light, wherein said reflecting plate has a plurality of reflecting surfaces each of which has one parabolic shape in cross section in a direction perpendicular to an axis direction of said discharge lamps and is formed into a gutter shape along the axis direction of the discharge lamps, each of said discharge lamps being housed inside each of the plurality of reflecting surfaces so as to be located at one focus of said each of the plurality of reflecting surfaces, adjacent reflecting surfaces being connected to each other on a side nearer to said diffuser plate than said discharge lamps so as to form a pseudo light source by light collected near a connection point between said reflecting surfaces out of emitted light from said discharge lamps wherein a protrusion part having a triangular shape in cross section and protruding toward said discharge lamp is formed along the axis direction of said discharge lamp at an innermost part of said reflecting surface which faces said discharge lamp, said protrusion part having a flat incline for reflecting the emitted light of said discharge lamp to said reflecting surface located outside said innermost part of said reflecting surface.