Patent ID: 6831678
Filing Date: 2004-12-14
Classification: G03H

Abstract:
A three dimensional video display including:a screen (4) on which successive frames of patterns can be displayed and means (6) for projecting an array of collimated light beams which can illuminate the whole screen (4) through a series of discrete directions in synchronism with the display of successive frames; wherein said screen (4) includes a layer of liquid crystal material (13) located between a front plate (8) and a rear plate (9); a layer of light sensitive material (15), operable to change the voltage on the adjacent layer (13) of liquid crystal material; a reflective layer (14) between the liquid crystal material (13) and the light sensitive material and electrode structures (10, 11) on the inner faces of plates (8, 9) for applying a voltage across the liquid material (13), the electrodes (10, 11) forming collectively an array of separately addressable segments in the liquid crystal layer (13) and each collimated light beam 6 is arranged to illuminate the whole of front plate 8.