CPC G02B 27/0179 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/013 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] | 20 Claims |
1. A device configured to enlarge an exit pupil area of a visual optical apparatus, the device comprising:
a diffraction grating configured to output a plurality of diffracted light beams of a plurality of diffraction orders by diffracting an incident light beam; and
a waveguide provided on the diffraction grating, the waveguide being configured to form an exit pupil based on a first diffracted light beam among the plurality of diffracted light beams output from the diffraction grating and to form exit pupil orders based on a second diffracted light beam among the plurality of diffracted light beams output from the diffraction grating,
wherein the waveguide is configured to form the exit pupil by outputting the first diffracted light beam without additional diffraction, and form the exit pupil orders by totally internally reflecting on the waveguide and diffracting on the diffraction grating, at least once, the second diffracted light beam and then outputting the totally internally reflected and diffracted second diffracted light beam,
wherein the first diffracted light beam comprises a 0 order diffracted light beam,
wherein the second diffracted light beam comprises a+1 order diffracted light beam and a−1 order diffracted light beam, and
wherein the waveguide is further configured to form a first exit pupil order based on the +1 order diffracted light beam, and form a second exit pupil order based on the −1 order diffracted light beam.
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