Patent ID: 8303153

Claim:
A planar light source device, comprising: a plurality of light guides being provided such that longer sides thereof are arranged in parallel with each other with a gap therebetween; a plurality of light sources each of which causes light to be directed from at least one of opposite end surfaces of the light guide in the longitudinal direction of the light guide; a plurality of optical path changing sections being provided on a light emission side of the light guide or on a reflecting sheet side opposite the light emission side, to extract light guided inside the light guide; and supports for supporting the light guides at predetermined intervals, wherein the light guide is arranged to be substantially T-shaped in cross section orthogonal to the longer side of the light guide, such that a side end part thereof facing an adjacent light guide is formed to be thinner than a center part thereof so that the light guide has thin-walled parts on the emission side or the reflecting sheet side.