Pulse width modulation sequence generation

Abstract

An electronic method for addressing and synchronizing a spatial light modulator (SLM) device when used with color scrolling recovery (SCR) illumination. This method applies all the colors to a single SLM simultaneously and recaptures secondary light, redirecting it along the primary color paths to significantly improve the brightness in single-chip display applications. The SCR concept requires multiple colors to be imaged on to an SLM array simultaneously. This requires that the SLM be divided into reset groups so that separate groups of pixels can project bits from the different colors at the same time. As these color bandsscroll across the array, the various reset groups tracks these regions and change content to match. The method requires that the device be divided and controlled at an independent reset group level, with each group being delayed by a group_skew timefrom the previous group. This method assures that all colors are exactly on the SLM at the same time, so that the color mix is the same at all times to assure good color intensities. Finally, the light during the transition time between colors bands, called spokes, is added together as white light that further increases the brightness of the system.