Importance

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Abstract

In a surface light source device of side light type applied to a liquid crystal display or the like, particularly, a surface light source device of side light type with emitting directivity, irregularities in luminance of output light are prevented from occurring in the vicinity of an incidence surface. In a surface light source device of side light type 10, a diffusible area M1 to diffusely reflect illumination light and an absorptive area (on a reflection sheet 11) to restrain the illumination light from reflection from bands in the vicinity of the incidence surface oppositely with the emitting surface of a light guide plate 12 with emitting directivity. It is thereby possible to reduce irregularities in output light luminance occurring in the vicinity of the incidence surface T. A light reflection member 18 may be arranged so as to extend over an edge EU of the emitting surface of the light guide plate 12, with directivity of illumination light emitted from the the emitting surface being modified. A light blocking material may be arranged on a side end surface of a light control member 13 to prevent illumination light emitted from a light source from being directly incident. Illumination light incident on the edge EU of the light guide plate may be blocked by a light blocking member 18. The diffusible area may be formed by roughening a surface opposite with the emitting surface.

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First Claim