Patent ID: 7019798
Filing Date: 2006-03-28
Classification: G02B,G02F

Abstract:
1. A display device comprising: a plurality of light emitting elements for emitting lights; a display element for modulating the light emitting from the plurality of light emitting elements so as to convert it to an image light showing an optical image; a reflection type hologram element, having a positive optical power with respect to the lights from the plural light emitting elements, for diffracting and reflecting the lights from the plural light emitting elements to approximately one direction so as to guide the diffracted and reflected lights to the display element; and an enlarging optical system for forming an enlarged image of the optical image converted by the lights from the image display element, wherein the plural light emitting elements are positioned in a plane such that an optical path of the lights diffracted and reflected by the hologram element is approximately orthogonal to the plane, and wherein the hologram element is tilted to a direction facing the plural light emitting elements with respect to the optical path of the lights diffracted and reflected by the hologram element.