LASER DISPLAY INCORPORATING SPECKLE REDUCTION

摘要

A laser projection display comprises in sequence: a laser source; beam expansion and collimation optics; first and second ESBG arrays; a microdisplay; a projection lens; and a screen. Each ESBG array is recorded in a Holographic Polymer Dispersed Liquid Crystal sandwiched between transparent substrates patterned to provide a two-dimensional array of independently switchable ESBG pixels. Each ESBG pixel is characterized by a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage. Each ESBG pixel diffracts incident collimated light into an illumination patch in proximity to the active surface of said microdisplay.