Patent ID: 7064894

Claim:
A rear-projection screen, comprising: at least one light-scattering polymethyl methacrylate layer of thickness in the range from 0.05 to 4 mm comprising spherical plastic particles whose size is in the range from 5 to 35 μm at a concentration in the range from 2 to 60% by weight, based on the total weight of the light-scattering polymethyl methacrylate layer; wherein the refractive index of the spherical plastic particles differs from that of the polymethyl methacrylate layer by a value in the range from 0.02 to 0.2; wherein the concentration of the spherical plastic particles c P , the thickness of the light-scattering polymethyl methacrylate layer d S , and the size of the spherical plastic particles D P are selected in such a way that the ratio c P *d S /D P 3 is in the range from 0.0015 to 0.015% by weight*mm/μm 3 ; and the ratio of average surface roughness of the polymethyl methacrylate layer R a to the size of the spherical plastic particles D P is in the range from 0.05 to 0.4.