OPTICAL FUNCTIONALITY DIFFUSION BOARD, REFLECTION SCREEN AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an optical functionality diffusion board capable of improving contrast performance so that an image can be clearly observed, a reflection screen and a method for manufacturing the reflection screen.

SOLUTION: The optical functionality diffusion board is provided with a diffusion board 113 having ruggedness on the surface and an optical thin film 114 having a refractive index lower than that of the diffusion board 113 and formed on the surface of the diffusion board 113. The optical thin film 114 is formed so that the rugged shape is reflected to the surface and film thickness is gradually thickened from the projected part to the recessed part on the surface of the diffusion board 113.

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