Patent ID: 7817329

Claim:
A 2-channel display system comprising two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; unpolarized light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space; a polarization split system PBS 1 with a plane of incidence P 1 POI simultaneously generating two spatially separated light beams of a different linear polarization feeding the two channels; SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam; MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “ON”-light beam, the modulated “ON”-beam being reflected normal to the MEMS surface; a polarization combining system PBS 2 with a plane of incidence P 2 POI for superimposing the two spatially modulated “ON”-light beams of each channel into a common “ON”-light beam, the polarization combining system being spatially separated from the polarization split system; means for folding the light paths in both channels, at least 1 in each channel, additional to the reflection of the MEMS, and additional to the folding in said PBSs, with planes of incidence T 1 POI in one channel and T 2 POI in the second channel, positioned between polarization split system and polarization combining system; said means for folding coupled to said polarization combining system such that the cutting angle γ 1 between T 1 POI and P 2 POI and the cutting angle γ 2 between T 2 POI and P 2 POI are γ 1 =±γ 2 (|γ 1 |=|γ 2 |), with −90°<γ 1 , γ 2 <=90°; means to control the mirror arrays of the MEMSs in both channels independently from each other; MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel in their virtual projection in the superposition image; MEMSs characterized by having internal symmetry (at least one axis of symmetry of the raster image is parallel or perpendicular to the deflection axis of the single mirror).