Patent ID: 6741307
Filing Date: 2004-05-25
Classification: G02B,G02F

Abstract:
An optical diffusion sheet comprising a transparent substrate and an optical diffusion layer having a concavo-convex surface formed of a resin coated layer on at least one side of the transparent substrate,wherein 60Â° glossiness of the fine concavo-convex surface is 70% or less, and a haze value of the optical diffusion sheet is 30% or more, and when the optical diffusion sheet is used in an optical element of a viewing display, the viewing display satisfies the following conditions: C1/C0&gE;0.2 C2/C0&gE;0.1 C3/C0&gE;0.1 â€ƒwherein C is a black and white contrast, C=(brightness in white display)/(brightness in black display), C0 is C when surface illumination is 0 lux, C1 is C when surface illumination is 500 lux, C2 is C when surface illumination is 1000 lux, and C3 is C when surface illumination is 2000 lux.