LIGHT CONTROL SHEET, PLANAR LIGHT SOURCE DEVICE AND TRANSMISSION TYPE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a light control sheet capable of reducing uneven luminance, and having high front luminance, and to provide a planar light source device and a transmission type display device, each equipped with the light control sheet.

SOLUTION: The light control sheet 15 is formed in a form approximated with at least three circular arcs of a first face part 151a in which the cross-sectional shape in a cross section parallel to the arraying direction of unit lenses 151 and vertical to the sheet surface forms an area including an apex T and a second face part 151b and a third face part 151 each forming the side face of the unit lens 151. A curvature radius R1 of the first face part 151a is≥10μm, and also, is≤1/2 of the array pitch P of the unit lenses 151. A curvature radius R2 of the second face part 151b and a curvature radius R3 of the third face part 151c are separately set in the range of 1/2 to 3 times of the array pitch P.

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