Hello,
I have a Acer k138ST which has been modified for a research application, I believe this model contains a DLPC350 and DLP4500DMD.
My understanding is that the pulse width modulation used to create grey scale from the bit planes uses an interleaved/shuffled pattern both between colors and the bit-planes themselves. For example, this shuffling results in the blue channel LED being active 4 times for every frame, each ~750usec long.
Unfortunately the bit-planes for a single color are also shuffled/interleaved, which is problematic because my intended application requires that 1) the blue LED be turned on for only 50-100usec of the normal 750usec window and 2) that some form of grey scale spatial structure be maintained (~4 bit is fine). The first requirement (modified LED timing) is working fine, but the second requirement that I know the actual pattern of interleaving which I can't find in the technical documentation and have failed to measure with a fast photodiode. Without knowing this timing diagram, I could be activating the LED entirely within the lowest precision bit resulting in an effectively binary image.
So a series of contingent questions - 1) Can you please confirm that the shuffling/interleaving pattern is static and not dynamic within one video mode. 2) If static, can you provide me the timing diagram of this interleaving? 3) If no timing diagram exists (hard to imagine), can you suggest a way to measure the timing of these bit planes on this type of commercial setup?
Thank you very much!
