Patent ID: 7637616

Claim:
A retinal scanning display device for projecting a light beam directly onto a retina of a viewer, and scanning the projected light beam on the retina, to thereby display an image onto the retina, the retinal scanning display device comprising: a light source emitting the light beam; a scanner scanning onto the retina the light beam emitted from the light source; a light exit at which the light beam scanned by the scanner exits the retinal scanning display device; a wavefront-curvature modulator modulating a wavefront curvature of the light beam emitted from the light source; a pupil expanding element operable to expand an exit pupil of the retinal scanning display device, the pupil expanding element being disposed at a position which is offset from an intermediate image plane occurring between the light source and the light exit, along and within an optical path defined between the light source and the light exit; and a position adjuster adjusting a position of the pupil expanding element along the optical path, wherein: the scanner scans onto the retina the light beam emitted from the wavefront-curvature modulator, and the light exit is in the form of a portion of the retinal scanning display device at which the light beam scanned by the scanner exits the retinal scanning display device.