Patent ID: 7714943

Claim:
A rear projection display system comprising: a) a housing having a thickness; b) a screen, having a screen diagonal and a screen normal direction, positioned at a front side of the housing; c) a light engine placed inside the housing, having an illumination stage adapted to create a beam of light, at least one display panel adapted to modulate the beam of light to create an image, and a lens system having a focal length and adapted to project the created image forming a projected image consisting of light rays; d) a non-rotationally symmetric first mirror placed inside the housing and in the optical path of said projected image, having dimensions significantly smaller than said screen diagonal, and having a horizontally convex curvature, and having a vertical curvature which is a function of the focal length of said lens system, such that for shorter focal length it is more concave and less convex, and for longer focal length, it is less concave and more convex, said first mirror adapted to reflect the projected image which is projected from said lens system; and e) a non-rotationally symmetric second mirror, placed inside the housing and in the optical path of said projected image, having dimensions significantly larger than said first mirror and smaller than said screen diagonal and having a vertical curvature which is a function of the size of the image in the absence of said second mirror relative to the size of the screen, such that for smaller image size it is convex and for larger image size it is concave, said second mirror adapted to reflect the projected image, which is reflected off of the first mirror, onto the screen to form a viewable image.