Patent ID: 6765720
Filing Date: 2004-07-20
Classification: C03C,G03B,Y10T

Abstract:
A rear projection screen comprising a plurality of glass microspheres in optical contact with a substrate and embedded in an opaque matrix;wherein the glass microspheres: have an average index of refraction of about 1.50 to about 1.70; comprise, on a theoretical oxide basis based on the amount of starting materials: greater than about 5 wt-% total of an alkali metal oxide selected from the group of Na2O, K2O, Li2O, and combinations thereof; no greater than about 40 wt-% SiO2; and no less than about 10 wt-% TiO2; and as produced have less than about 15% defects in a population, and include less than the total amount of alkali metal oxide than the theoretical amount based on the amount of starting materials.