Patent ID: 6219183
Filing Date: 2001-04-17
Classification: G03B

Abstract:
A rear projection display comprising:a projection device for projecting an image;a screen for displaying said image, the screen having a front, outside surface and a rear, inside surface;an optical system, including at least a first reflective surface, for receiving the image from the projection device and directing the image onto and along a central optical axis and onto the rear surface of the screen; anda screen moving device, includingi) screen support frame having at least first and second frame sections telescopically movable relative to each other along said central axis, wherein the screen is connected to said first frame section for movement therewith, andii) a moving device connected to the screen support frame to move the first frame section relative to the second frame section and thereby to move said screen along said central optical axis, toward and away from said projection device, through a range of positions between a full extended position and a full retracted position; andwherein the optical system is adapted to fully project the image onto the screen when the screen is in any of said range of positions between the full extended and the full retracted positions.