"Surface Light Source Device And Display"

Abstract: There is provided a surface light source device having a configuration where light sources are arranged on both of a pair of side surfaces of a light guide plate and allowed to independently form nonuniform light emission intensity distributions in which light emission intensity is lower and higher at places closer to and farther from each of the light sources. Light guide control sections 11L and 11R controlling guiding of light from light sources 10L and 10R are arranged on a reflection surface S1 of a light guide plate la. The light guide control section 11L is configured of concave sections 11L1 to 11L5, and the concave sections 11L1 to 11L5 include inclined surfaces al 1 to al5 facing the light source 10L and inclined surfaces bl 1 to bl5 facing the light source 10R, respectively, and the heights H of the concave sections 11L1 to 11L5 increase with increasing distance from the light source 10L. A nonuniform light emission intensity distribution in which light emission intensity is lower and higher at places closer to and farther from the light source 10L is formed by lighting of the light source 10. As the inclined angles a of the inclined surfaces al 1 to al5 are larger than the inclined angles ß of the inclined surfaces bl 1 to bl5, an influence of the light guide control section 11L on light from the light source 10R is reduced.

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