Patent ID: 8979272
Filing Date: 2015-03-17
Classification: G03B,H04N

Abstract:
1. A display device of producing a color image using four or more primary colors, the device comprising: a polarization conversion system, the polarization conversion system converting light from an illumination unit to have a first polarization state; four or more transmissive spatial light modulators to modulate four or more, respective, primary color light beams in accordance with four or more, respective, primary color image components of the color image to produce four or more, respective, modulated light beams, wherein the four or more primary color light beams include a green color light beam and only a spatial light modulator for a green color light beam rotates a polarization of the green color light beam to be a second polarization state; and a beam combiner to combine the four or more modulated light beams into a combined light beam carrying the color image, the-beam combiner comprising: an X-cube to jointly direct three of the four or more modulated light beams according to polarization state; and a selective color rotator disposed on a light emitting surface of the X-cube to rotate the polarization of two of the three modulated light beams, while maintaining the polarization of a third one of the three modulated light beams, which is the green color, wherein each of three side surfaces of the X-cube receives the three of four or more modulated light beams having the spectral ranges corresponding to the first primary color, the second primary color and the third primary color respectively.