Holographic waveguide display

摘要

A holographic waveguide display comprises: a source of light; at least one switchable grating layer comprising a multiplicity of grating regions each switchable between a diffracting state and a non diffracting state; means for spatio-temporally modulating light from the source to provide image light comprising at least one beam deflector for scanning the light in at least one of two orthogonal directions and at least one modulator for amplitude modulating the light. A first scanned angular range of light is diffracted through a first area into a first field of view by a first set of grating regions, and through a second area into to the first field of view by a second set of grating regions. Each grating region of the first and second sets has a first grating function. The first and second areas lie within an exit pupil of the display.

主权项

1. An apparatus for producing an image comprising:
a source of light of a first wavelength; at least one 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 at least one SBG layer, said transparent plates together functioning as a total internal reflection 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 through a first area into a first field of view by a first set of grating regions in said diffracting state, and through a second area into said first field of view by a second set of grating regions in said diffracting state each grating region of said first and second sets having a first grating function, wherein said first and second grating regions are separated along a total internal reflection path followed by said light in said lightguide, wherein said first region and grating region are switched into a diffracting state sequentially.