Patent ID: 6509982
Filing Date: 2003-01-21
Classification: G02B

Abstract:
A method of diffusing light for a display comprising the steps of:sending a group of collimated or partially collimated light beams through a substrate matrix of a plurality of nested individual joined geometrically shaped cells wherein each of the cells contains a patterned holographic diffuser with a set projection angle; producing from each of the cells a transmitted diffused light beam with a narrow angular luminance distribution profile curve with sharply vertical profile slopes at halfpeak points; and superimposing each transmitted diffused light beam from each of the cells to produce a combined resultant diffused light beam having an angular luminance distribution profile curve with sharply vertical profile slopes at halfpeak points and with a substantially flat and wide peak to produce a uniform resultant luminance over a wide range of view angles with a predetermined beam spread and beam deflection angle in relation to a predetermined location of view of the combined resultant diffused light beam.