Patent ID: 8885120

Claim:
A color Liquid Crystal Display (LCD) device for displaying a temporally-integrated color image comprising a sequence of at least four non-white primary color images, the device comprising: an array of Liquid Crystal (LC) elements; driving circuitry adapted to receive an input corresponding to each of said at least four primary color images and to selectively activate the LC elements of said LC array to produce attenuation patterns corresponding to gray-level representations of each of said at least four primary color images, respectively; and an illumination system adapted to sequentially back-illuminate said LC array with light of at least four different primary colors corresponding to the colors of said at least four primary color images, wherein said illumination system comprises: an array of at least three Light Emitting Diodes (LEDs) having at least three different colors, respectively, wherein the LED colors include at least red, blue, and green, and the number of LED colors in the array is less than the number of primary colors used in the primary color images, illumination control circuitry adapted to selectively activate said array of LEDs to produce a sequence of at least four illumination patterns, each said illumination pattern having a color corresponding to each of said at least four different primary colors, respectively, wherein at least one of said at least four illumination patterns produces one of said primary colors by simultaneously activating at least two different colors of said LEDs, and an optical arrangement which causes the at least four illumination patterns produced by said array of LEDs to back-illuminate said LC array with a generally spatially homogeneous light of said at least four, respective, primary colors, wherein said driving circuitry and said illumination system are synchronized such that each said attenuation pattern is illuminated with light of the primary color corresponding to the respective primary color image, thereby producing a temporally-integrated image comprising the at least four primary color images, wherein the light produced by the LEDs to back-illuminate the LC array corresponds to the primary colors displayed to produce the temporally-integrated image.