Patent ID: 8639072
Filing Date: 2014-01-28
Classification: G02B,G03H

Abstract:
1. An apparatus for producing an image comprising: a source of light of a first wavelength; a first SBG layer comprising a multiplicity of grating regions each switchable between a diffracting state and a non diffracting state ; first and second transparent plates sandwiching said SBG layer, said transparent plates together functioning as a light guide; a multiplicity of independently switchable transparent electrode elements applied to said plates overlaying said switchable grating regions; means for spatio-temporally modulating light from said source to provide image light comprising at least one beam deflector for scanning said light in at least one of two orthogonal directions and at least one modulator for amplitude modulating said light; and means for coupling said image light into said light guide, wherein a first scanned angular range of light coupled into said light guide is diffracted out of said light guide into to a first field of view by a first set of grating regions in said diffracting state, each grating region of said set having a first grating function.