Waveguide laser illuminator incorporating a Despeckler
AssigneeDigiLens Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern, Alastair John Grant
Life of this patent
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Abstract
There is provided an illumination device comprising: a laser; a waveguide comprising at least first and second transparent lamina; a first grating device for coupling light from the laser into a TIR path in the waveguide; a second grating device for coupling light from the TIR path out of the waveguide; and a third grating device for applying a variation of at least one of beam deflection, phase retardation or polarization rotation across the wavefronts of the TIR light. The first second and third grating devices are each sandwiched by transparent lamina.
Claims19
An image projection device comprising:
- a light source;
- a reflective microdisplay;
- a waveguide comprising:
- an input grating for coupling light from said light source into a total internal reflection (TIR) path in said waveguide;
- and
- an output grating for coupling light from said TIR path out of said waveguide and towards said reflective microdisplay,
- wherein said waveguide is formed from transparent lamina sandwiching said input grating and said output grating,
- wherein said output grating is configured to transmit light reflected from said reflective microdisplay;
- and
- a lens for projecting image modulated light reflected from said microdisplay over a field of view.
Dependencies are inferred from the claim text.