Patent ID: 8098265

Claim:
A solid state light based projection display system comprising: plurality of pixel illuminating devices to illuminate a plurality of pixels in each of a plurality of color slots, each pixel having digitally controllable on/off states, the pixel illuminating devices using solid state light sources; projection optics optically coupled to magnify an image generated by the plurality of digitally controllable pixels; a pulse width modulation (PWM) block coupled to the pixel illuminating devices to control the on/off states of each of the digitally controllable pixels and a hierarchical multiplexing functional block coupled to receive digital image data and a multiplicity of other external inputs and to provide control and synchronization sisals to the plurality of pixel illuminating devices and the PWM modulation functional block to cause the plurality of digitally controllable pixels to generate an image responsive to the image data; wherein the hierarchical multiplexing functional block carries out three levels of processing whereby; in the first processing level, referred to as gamut control level, simultaneous on/off duty cycles of each of the pixel illuminating devices required to synthesize a target gamut are computed by mapping chromaticity and brightness values of native color primaries of the SSL devices, provided by an external input, to chromaticity and brightness values of target gamut color primaries, provided by an external input; in the second processing level, referred to as white point control level, the simultaneous on/off duty cycles of the pixel illuminating devices computed in the first processing level are modified to incorporate the chromaticity and brightness values of the required white point provided by an external input; and, in the third processing level, referred to as brightness control level, the simultaneous on/off duty cycles of the pixel illuminating devices computed in the second processing level are further modified to incorporate adjustments in brightness of the display system white point provided by an external input.