Patent ID: 8567957
Filing Date: 2013-10-29
Classification: G02B,G03B,H04N

Abstract:
1. An imaging system configured to reduce perceived speckle in images produced by the imaging system, the imaging system comprising: one or more laser sources; a light modulator configured to produce the images with light from the one or more laser sources by modulating the light along a projection surface; and one or more active polarization switches disposed in an optical path of the imaging system and configured to alternate a polarization orientation of the light in synchrony with an image refresh cycle of the imaging system, wherein the one or more laser sources comprise three laser sources, and the one or more active polarization switches comprises a single ferroelectric device, wherein the single ferroelectric device is electronically switchable between a first state having a first optical axis orientation and a second state having a second optical axis orientation separated by a tilt angle of about forty-five degrees, wherein a thickness of the single ferroelectric liquid crystal device is configured to function as a half wave plate for one of the three laser sources, wherein the three laser sources comprise a red laser source, a blue laser source, and a green laser source, wherein a thickness of the ferroelectric liquid crystal device functions as a half wave plate for green light; and one or more quarter wave plates disposed between one or more of the red laser source or the blue laser source and the single ferroelectric liquid crystal device.