Patent ID: 7629041
Filing Date: 2009-12-08
Classification: G02B,G02F,G03B,Y10T

Abstract:
1. A diffuser sheet for LCD applications comprising at least one light-scattering polymethyl methacrylate layer having a thickness in the range from 2 to 5 mm and an average surface roughness R Z in the range from 5 to 50 μm, wherein the polymethyl methacrylate layer comprises a polymethyl methacrylate matrix and also from 0.5 to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical scattering particles (A) whose median size V 50 is in the range from 0.1 to 40 μm, and whose refractive index differs from that of the polymethyl methacrylate matrix by a value in the range from 0.02 to 0.2, and from 0.5 to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical particles (B) whose median size V 50 is in the range from 10 to 150 μm and whose refractive index differs from that of the polymethyl methacrylate matrix by a value in the range from 0 to 0.2, where the total concentration of the spherical scattering particles (A) and particles (B) is in the range from 1 to 60% by weight, based on the weight of the light-scattering polymethyl methacrylate layer; wherein the median particle size V