CPC G02B 27/48 (2013.01) [G02B 5/32 (2013.01); G02B 6/0016 (2013.01); G02B 6/0038 (2013.01); G02B 6/0055 (2013.01); G02B 6/0083 (2013.01); G02B 27/4261 (2013.01); G02F 1/292 (2013.01); G02F 1/3136 (2013.01)] | 20 Claims |
1. 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 diffract light polarized in a first direction towards said reflective microdisplay and transmit light reflected from said reflective microdisplay and polarized in a second direction; and
a lens for projecting image modulated light reflected from said microdisplay over a field of view.
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