Patent ID: 7946708
Filing Date: 2011-05-24
Classification: G02B

Abstract:
1. A display device comprising: a light source that supplies light; a phase modulator that modulates the phase of the light from the light source to form an image; an imaging optical system that focuses the image formed through the modulation performed by the phase modulator; and a partial transmission mirror that reflects a part of the light emitted from the imaging optical system and causes the part of the light to travel toward a viewer, wherein the phase modulator produces diffracted light according to a phase modulation pattern while changing the phase of the light so as to form an intermediate image between the phase modulator and the imaging optical system, and the phase modulator moves the intermediate image forward and backward along an axis defined by a propagation path of the light between the phase modulator and the imaging optical system, the phase modulator uses first-order diffracted light to form an image, and the imaging optical system is disposed at a position where zero-order diffracted light from the phase modulator is not incident.