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DLPLCR4500EVM: black vector missing

Part Number: DLPLCR4500EVM

Dear TI Expert,

I am Leonardo Sacconi, the Principal Investigator of the OptoCARD Lab at the Institute of Clinical Physiology of the National Research Council.

We would like to employ the Lightcrafter 4500 in a straightforward scenario where the switch between two preloaded patterns (at 1-bit) is defined by the transition trigger line. For example, when a positive-edge trigger occurs, the DMD loads pattern 0 with a red LED and remains in this state for an indefinite time until a negative-edge trigger enables the switch to pattern 1 with a blue LED, and so on. What is crucial for us is that the trigger not only determines the transition between the two patterns (and colors) but also defines the illumination period.

We have made several attempts using the attached configuration.

We have observed that when the "Black vector missing" warning is displayed, the DMD responds according to our requirements. However, when the "Black vector missing" warning is off, the transition between the two patterns occurs but with a limited illumination time imposed by the software. It's disappointing that the "Black vector missing" warning appears randomly during every sequence verification, even if all the sequence settings remain the same.

Could you please explain what the "black vector missing" warning means? In general, do you have any advice on how to meet our requirements?

Let me add that I began using your Lightcrafter 4500 system over five years ago, and even though I have carefully studied the manual multiple times, I have unfortunately not been able to find any information related to this request.

Thank you very much for your attention and support.


Leonardo Sacconi