Patent ID: 6211976
Filing Date: 2001-04-03
Classification: G02B,G02F,G03H

Abstract:
A projection system comprising:a light source for producing broadband light;an image display;a first switchable holographic optical element (HOE) disposed between said image display and said light source, wherein said first switchable HOE is configured to diffract light of a first color from said light source to said image display and wherein said first switchable HOE is configured to transmit without substantial alteration light of the first color from said image display into an output direction; anda second switchable HOE disposed between said image display and said light source, wherein said second switchable HOE is configured to diffract light of a second color from said light source to said image display and wherein said second switchable HOE is configured to transmit without substantial alteration light of the second color from said image display into the output direction.