Patent ID: 7926949

Claim:
Dual mode projection display apparatus, comprising: an illumination system producing first and second sub-beams with respective first and second polarizations, said first and second polarizations being orthogonal to each other, said first sub-beam comprising a first sequence of colors c 11 . . . ci 1 . . . cn 1 , said second sub-beam comprising a second sequence of colors c 12 . . . ci 2 . . . cn 2 , said first and second sequences of colors ci 1 and ci 2 each comprising a different sequence of primary colors, said colors ci 1 and ci 2 , being present in respective corresponding time intervals t 1 i , t 2 i , said corresponding time intervals t 1 i , t 2 i , for each sub-beam being synchronized, for any adjacent said time intervals t 1 i , t 1 i+ 1, said colors c 1 i , c 1 i+ 1 being different, and for any adjacent said time intervals t 2 i , t 2 i+ 1, said colors c 2 i , c 2 i+ 1 being different, so that in at least one common time interval t 1 , 2 i , said first and second sub-beams have different colors, wherein said first and second sub-beams and said first and second polarizations in said illumination system are achieved by using different devices independently; first and second light modulators encoding first and second respective color image components I 11 . . . Ii 1 . . . In 1 and I 12 . . . Ii 2 . . . In 2 onto said first and second sub-beams during said common time intervals t 1 , 2 i and forming respective first and second output image sub-beams having orthogonal polarizations; said first and second color image components each making-up respective first and second full-color images; a polarizing beam splitter combining said first and second output image sub-beams into an output beam; and a projection lens for projecting the output beam onto a display screen, displaying stereoscopic 3D images in at least one passive 3D mode selected from passive 3D mode with polarizing glasses and passive 3D mode with color filter glasses, and an active 3D mode with liquid crystal shutter glasses.