Patent ID: 6822707
Filing Date: 2004-11-23
Classification: G02B,G02F,G03B

Abstract:
An optical sheet comprising:a transparent base material; a fine lens array constituted by a plurality of fine unit lenses formed on a front surface of said transparent base material; a diffusing layer formed on a rear surface of said transparent base material opposite to said surface on which said fine lens array is formed; and a light absorbing layer formed on said diffusing layer and including fine opening portions substantially located at focal points of said unit lenses; wherein said diffusing layer is made of a transparent medium containing transparent fine particles different in refractive index from said transparent medium, and said transparent fine particles have a mean particle size in a particle size range for maximizing a value of Q/R at each of wavelengths in a visible region when Q is a scattering sectional area per transparent fine particle, and R is a radius of each of said transparent fine particles.