Patent ID: 7009775
Filing Date: 2006-03-07
Classification: G02B

Abstract:
1. A display system, comprising: a display device having a display portion on which an image is to be displayed, a relay optical system having an entrance pupil and adapted for projection of the image, and an eyepiece optical system, comprising: a substrate with a Fresnel surface formed thereon, wherein the Fresnel surface comprises rotationally symmetric concentric zones, and the substrate includes at least a curved area, wherein: the eyepiece optical system forms a final pupil that is an image of the entrance pupil at a given position, and the relay optical system and the eyepiece optical system are located such that an axial chief ray emerging from the relay optical system is obliquely incident on the eyepiece optical system, with the proviso that the axial chief ray is defined by a light ray emerging from a center of the display portion, and passing through the relay optical system and then through a center of an exit pupil of the relay optical system, wherein the display system satisfies condition (1): where EPD is a diameter of the exit pupil of the relay optical system, and E is an amount of aberration at a position of the final pupil.