Patent ID: 9019584
Filing Date: 2015-04-28
Classification: C23C,G02B,G03H

Abstract:
1. A holographic image display system comprising: a screen including a photochromic material having a band gap greater than about 3 eV, the photochromic material having an initial value of light absorption coefficient when not illuminated by ultraviolet light, wherein the photochromic material is transmissive to visible light when the light absorption coefficient has the initial value, and wherein the light absorption coefficient increases when the photochromic material is illuminated by ultraviolet light and reverts to the initial value when the illumination by the ultraviolet light is removed; a first light source configured to emit a visible coherent light beam that is applied to the screen; a second light source configured to emit an ultraviolet light beam that is applied to the screen; a scanning mechanism configured to allow the ultraviolet light beam to scan across the screen; and a controller configured to control emissions of the second light source and scanning of the scanning mechanism based on a holographic signal.