Sumitomo Chemical Company, Limited

Gihwan Ahn

Byoungin Kim

Hirofumi Ohta

A light control plateA of the present invention is disposed in front of a surface light sourcethat emits, in a predetermined direction, parallel light Fhaving a substantially uniform luminance distribution. The light control plateA has a light incidence surface, at which there are provided optical path control sectionsA of concave and/or convex cross-sectional shape, and a planar light exit surface. The surface of the optical path control sectionsA comprises first to M-th planar portionsAtoA. The inclination angles &#x3b1;to &#x3b1;and pitch ratios Lto Lof each planer portion are specified in such a manner that the parallel light Fcan be spread within an exit angle range &#x2212;&#x3b8;to &#x3b8;relative to the predetermined direction, to exit as light having a substantially uniform luminance angular distribution within the exit angle range. Thereby, parallel light having a uniform luminance distribution can be spread within a predetermined angle range, to exit as light having a substantially uniform luminance angular distribution within the angle range.

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Cheongju-si, South Korea

Gihwan Ahn