Patent ID: 6963451
Filing Date: 2005-11-08
Classification: G02B

Abstract:
1. A light diffusing sheet comprising a light-transmittable resin, in which irregularities are formed on both sides of the sheet, the average surface roughness of one side which becomes the light-entering side is larger than the average surface roughness of the opposite side that becomes the light-departing side, and the surface area ratio of said one side is smaller than the surface area ratio of said opposite side, characterized in that the average surface roughness of said one side is from 0.2 to 5.0 μm, the average surface roughness of said opposite side is from 0.2 to 2.0 μm, the surface area ratio of said one side is from 1.001 to 1.150 and the surface area ratio of said opposite side is from 1.010 to 1.250.