Patent ID: 7710645
Filing Date: 2010-05-04
Classification: G03B

Abstract:
1. An apparatus for selectively reflecting a beam of light from a front projector, the apparatus comprising: a projection screen that includes an etalon coating structure comprising: a first layer comprising a generally reflective material; a second layer positioned such that it is closer to the projector than the first layer, the second layer comprising a dielectric material; and a third layer positioned such that it is closer to the projector than the second layer, the third layer comprising a generally partially reflective semiconductor material; wherein the projection screen produces a reflection having asymmetrically-shaped reflective peaks in the visible spectrum, wherein the reflection percentage rolls off from the peaks to a local minimum in less than 20 nm as the wavelengths get shorter and wherein the reflection percentage rolls off from the peaks to a local minimum in greater than 50 nm as the wavelengths get longer.