System and method of reducing color shift in a display

Abstract

A system and method of reducing color shift in a display includes an interferometric modulator display configured to reflect light from at least one light source and through at least one converging optical element in an optical path from the light source to a viewer via the display. In one embodiment, the converging optical element comprises a diffractive optical element.

1 . A display system for displaying an image, the display system comprising:
 a reflective display comprising a plurality of display elements configured to modulate light incident on the reflective display; and   a converging optical element positioned with respect to a surface of at least one of the plurality of display elements such that a focal length of the optical element is greater than a distance between the optical element and the surface,   wherein the optical element has a lens aperture greater than a total aperture of two of the plurality of display elements.   
     
     
         2 . The display system of  claim 1 , wherein the optical element comprises a diffractive optical element. 
     
     
         3 . The display system of  claim 2 , wherein the optical element comprises a binary optical element. 
     
     
         4 . The display system of  claim 2 , wherein the optical element comprises a diffuser. 
     
     
         5 . The display system of  claim 1 , wherein the optical element has an aperture as large as a total aperture of the plurality of interferometric modulators. 
     
     
         6 . The display system of  claim 1 , wherein the optical element comprises a lenticular lens. 
     
     
         7 . The display system of  claim 2 , wherein the optical element is configured to spread the modulated light differently along a first axis of the display system than along a second axis of the display system. 
     
     
         8 . The display system of  claim 7 , wherein the first axis is a horizontal axis and the second axis is a vertical axis. 
     
     
         9 . The display system of  claim 1 , further comprising a light source, wherein the optical element is configured to compensate for at least one optical property of the light source. 
     
     
         10 . The display system of  claim 1 , further comprising a substrate supporting the plurality of display elements and supporting the optical element. 
     
     
         11 . The display system of  claim 10 , wherein the substrate is located between the optical element and the plurality of display elements. 
     
     
         12 . The display system of  claim 10 , wherein the optical element is located between the plurality of display elements and the substrate. 
     
     
         13 . The display system of  claim 10 , wherein the plurality of display elements are located between the optical element and the substrate. 
     
     
         14 . The display system of  claim 1 , wherein the plurality of display elements are configured to output colored light. 
     
     
         15 . The display system of  claim 14 , wherein each of the plurality of display elements is configured to output colored light. 
     
     
         16 . The display system of  claim 1 , wherein the display system has a diagonal size greater than 30 inches. 
     
     
         17 . A display system for displaying an image, the display system comprising:
 a reflective display having a plurality of display elements configured to modulate light incident on the reflective display; and   a converging optical element configured to redirect light incident on at least one of the display elements, the optical element having a lens aperture greater than a total aperture of two of the plurality of display elements and configured to reduce color shift of an image between two viewing locations.   
     
     
         18 . The display system of  claim 17 , wherein the optical element comprises a diffractive optical element. 
     
     
         19 . The display system of  claim 17 , wherein the optical element comprises a binary optical element. 
     
     
         20 . The display system of  claim 17 , wherein the optical element comprises a diffuser. 
     
     
         21 . The display system of  claim 17 , further comprising a substrate supporting the plurality of display elements and supporting the optical element. 
     
     
         22 . The display system of  claim 21 , wherein the substrate is located between the optical element and the plurality of display elements. 
     
     
         23 . The display system of  claim 21 , wherein the optical element is located between the plurality of display elements and the substrate. 
     
     
         24 . The display system of  claim 21 , wherein the plurality of display elements are located between the optical element and the substrate. 
     
     
         25 . The display system of  claim 21 , further comprising a light source, wherein the optical element is configured to compensate for at least one optical property of the light source. 
     
     
         26 . A display system for displaying an image, the display system comprising:
 means for interferometrically modulating light incident thereon; and   means for converging light adapted so as to limit color shift of at least a portion of the image between different viewing locations.   
     
     
         27 . The display system of  claim 26 , further comprising means for spreading the modulated light differently along a first axis of the display system than along a second axis of the display system. 
     
     
         28 . The display system of  claim 26 , further comprising means for illuminating, wherein the means for converging comprises means for compensating for the effects of at least one optical property of the means for illuminating.