PRISM ARRAY SHEET, EDGE LIGHT TYPE SURFACE ILLUMINANT, AND TRANSMISSION TYPE IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To save energy and to improve front face luminance by improving use efficiency of light even when a prism array side is a light incidence side, in a prism array sheet, an edge light type surface illuminant, and a transmission type picture display device.

SOLUTION: In the prism array sheet 10 whose one face has a prism array 1 on which a plurality of prisms are arranged, fine ruggedness 2 in which the period of projected parts is equal to or shorter than the wavelength of light is formed on a prism slope 1i becoming the light incidence side of the prism as an antireflection processing and such antireflection processing is not performed to the slope 1r of the prism becoming a reflection face in the prism. In the edge light type surface illuminant, one or more prism array sheets are arranged on the light exiting face side of a light guide plate while directing the prism array side toward the light guide plate side. In the transmission type picture display device, the edge light type surface illuminant is arranged on the rear side of the transmission type picture display element so that the prism array sheet is located between the light guide plate and the transmission type picture display element.

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