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 bands 602, 604, 606
scroll 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
time 608 from 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 1010, is added together as white light
that further increases the brightness of the system.
