Projected television device and screen

Abstract

A front projection display device is provided including an image-generating source configured to generate an image, a wide angle lens system adapted to receive the image, and a screen. The wide angle lens system may be configured to increase distortion of the image in a first stage and decrease distortion of the image in a second stage. The screen may be configured to receive the image from the wide angle lens system on a first side and reflect the image back to a viewer on the first side. In another embodiment, a screen is provided for a front projection system, the screen may be configured to receive light from a steep angle and may include any number of surface topographies configured to reflect light back to the viewer along a desired viewing plane.

What is claimed is: 
     
         1 . A lens system using for a front projection display device comprising;
 a wide angle projection system having a first lens stage to create a distorted intermediate image and a second, wide angle lens stage that causes distortion to substantially cancel the distortion of the intermediate image and to project a substantially non-distorted image corresponding to the intermediate image at a field angle of greater than 100 degrees.   
     
     
         2 . The lens system of  claim 1 , wherein a fold mirror or prism folding an image path 90 degrees. 
     
     
         3 . The lens system of  claim 1 , wherein two fold mirrors or prisms altering an image direction 180 degrees,. 
     
     
         4 . The lens system of  claim 2 , wherein an optic axis of the first stage and an optic axis of the second stage form an angle of 90 degrees. 
     
     
         5 . The lens system of  claim 3 , wherein an optic axis of the first stage and an optic axis of the second stage form an angle of 180 degrees. 
     
     
         6 . The lens system of  claim 1 , wherein the second, wide angle stage includes a wide-angle lens. 
     
     
         7 . The lens system of  claim 1 , wherein the first stage includes a relay lens group. 
     
     
         8 . The lens system of  claim 1 , wherein the second, wide angle stage includes an optical element of positive optical power. 
     
     
         9 . The lens system of  claim 1 , wherein the second, wide angle stage includes a lens.