Importance

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Abstract

A light guide plate, surface light source device and liquid crystal display of a double-reflection-direction-conversion type have a heightened applicability to an front-lighting arrangement. A back face 14 of a light guide plate 10 is provided with micro-reflectors shaped like trapezoids each of which has a bottom face extending generally in parallel with a general plane of the back face 14. A main input light H10 to a micro-reflector 20 is incident to an incidence end face 12 (at point a) and inputted thereto in a somewhat downward inclined direction. An inner input light is inner-reflected mainly by slopes 21 and 22 successively (at points b and c), becoming an inner output light IO directed to an emission face 13. The inner output light IO is emitted from the emission face 13 (at point d), being supplied to an LCD panel or the like after transmitting through a light diffusion sheet DF (points e and f). An application to a front-lighting arrangement prevents the displayed image from being blurred since a returning light coming from an LCD panel is hardly bent by the micro-reflectors.

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First Claim