Patent ID: 8585206
Filing Date: 2013-11-19
Classification: G02B,H04N

Abstract:
1. A method for operating a light source of a scanning laser projector comprising: projecting an image comprising a plurality of frames with the light source of the scanning laser projector at a frame rate of the scanning laser projector; and changing a polarization and a wavelength of the light source to create a speckle reduction sequence comprising uncorrelated speckle patterns and partially correlated speckle patterns, wherein: the speckle reduction sequence is projected with the light source as the intensity of the light source is modulated to produce the image; a period of the speckle reduction sequence is less than about 0.04 seconds, or from about 0.07 seconds to about 0.13 seconds; individual ones of the uncorrelated speckle patterns comprise one of at least a first wavelength and a second wavelength and one of a first polarization or-and a second polarization, wherein the first polarization is orthogonal with the second polarization, both the first wavelength and the second wavelength are in a green spectral range, a blue spectral range, or a red spectral range, and a magnitude of a difference between at the first wavelength and the second wavelength is at least 0.3 nm; and individual ones of the partially correlated speckle patterns comprise an intermediate wavelength and an intermediate polarization, wherein the intermediate wavelength is between the first wavelength and the second wavelength and the intermediate polarization is non-orthogonal with the first polarization and the second polarization.