Patent ID: 8520290

Claim:
A display system comprising at least one Spatial Light Modulator (SLM) and at least one variable light source and at least one control unit controlling said SLM and said light source wherein: 1) said control unit applies multiple-bits image data to control a plurality of micromirrors of the SLM to modulate an illumination light wherein a least significant bit (LSB) of the multiple-bits image data defining a minimum controllable time period for each of the micromirrors of the SLM during a display frame period represented by the multiple-bits image data; 2) said control unit controls the micromirror to operate at least twice in the display frame period; and 3) said control unit also simultaneously controls said light source to project different light intensities of the illumination light to the SLM during said minimum controllable time periods to increase a controllable gray scale of the display system without reducing a significant amount of image brightness.