CPC G02B 6/0018 (2013.01) [G02B 3/0056 (2013.01); G02B 6/0028 (2013.01)] | 20 Claims |
1. A projection display comprising:
a waveguide comprising an input grating having a plurality of linear diffractive features, the input grating configured to couple in light into the waveguide; and
an array of LEDs configured to form an illumination pupil which is optically relayed as an input pupil onto the input grating, at the input grating the input pupil having a shape that is larger in a direction parallel to the linear diffractive features than in a direction perpendicular to the linear diffractive features.
|