| 摘要 |
A surface light source device illuminating a displaying member of a display comprises stacked first and second light guide plates between which a low-refractive-index-layer is interposed. The light guide plates are disposed so that side end faces of light incidence sides of the light guide plates located oppositely to each other and an emission face of the first light guide plate is opposite to a back face of the second light guide plate across the low-refractive-index-layer interposed between the light guide plates. Each of light guide plates has an emission-restraint-region, an emission-gradual-increase-region and an emission-promotion-region which are formed as to be located in order away from an incidence side toward a distal end face. Although each of light source groups consists of at least two point-like-light-sources emitting light of different colors, light of various colors undergoes color mixing in each emission-restraint-region, thereby preventing emission from the emission face of the second light guide plate from showing color unevenness.
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