| 摘要 |
A liquid crystal display panel of a display is illuminated by a surface light source device. The surface light source device comprises a primary light source consisting of, for example, a point-like light source and a light guide plate which is supplied with light to be introduced through an incidence face and to be emitted through an emission face. A back face is provided with repeatedly configurated slopes having inclinations such that a backward inner propagation light is converted into an inner reflection light directed to the emission face in order to urge the backward inner propagation light to be emitted preferentially through the emission face. A forward inner propagation light travelling toward a distal end face from an incidence face is rather restrained from being emitted. The backward inner propagation light, which is produced by a reflection at the distal end face, is inner-reflected at the repeatedly configurated slopes on the way of approaching the incidence face, resulting in an effective producing of light which is directed to the emission face.
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