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Controlling the DLP LightCrafter after removing the light engine

Zeren Lin
Prodigy 40 points

Hello,

I'm using the DLP LightCrafter as an intensity modulator. I have replaced the light engine with a collimated 532nm laser. However, I just couldn't display the desired 1-bit patterns / pattern sequences via the GUI. That is, whether I selected the Static, Test pattern, or Pattern sequence mode, the reflected laser didn't change at all, even though a COMMAND SUCCESS always appeared. The following is the tests I have done so far.

1. The splash screen was shown correctly. The intensity of the reflected laser changed from the typical grating to a blazed one. As far as I know, the default image is vertical bars after power-on. This was consistent with what I saw.

2.  I tried to see the pattern change on the DMD by eye. The splash screen was correct again. However, no changes have been observed in patterns / pattern sequences. Even when all-white / all-black images were uploaded. BTW, my trigger period was 100,100 us with the AUTO mode.

3. To test whether I have broken the board when removing the light engine, I reconnected it and everything was correct as usual. Also, I observed that the LED shining on the system board was correct. Which is, two red and then one-red-one-green.

Now, I'm afraid this might be some problem with the GUI. FYI - my firmware version is DM365 5.0, FPGA 2.6.43, and MSP430 3.0. Can anyone help me with that? Thank you.

  • 0
    TI__Genius 11325 points

    Hi Zeren,

    I'm taking a look into your issue. Can you confirm that you are not able to see test patterns on your DMD? I have taken off the light engine of a LightCrafter and the test patterns are still displaying properly. I'm going to examine pattern sequence mode and follow up.

    You listed your trigger period as 100, 100 us; what is your exposure value? You can go a 'get' to make sure what's stored in the device is what's reflected in the GUI. If you take a look at the user's guide (Table 4-3. Internal Pattern Exposure Time), normal 1-bit pattern sequences are limited to 100,000 us exposure times. Other bit depths have different minimums and maximums.

    Is your GUI version 5.0.0? If so you are on the latest version.

    Thanks,
    Clinton

  • 0 in reply to Clinton Rodgers
    Prodigy 40 points
    Hi Clinton,

    Thank you for your reply. Actually I've figured out the problem. It was because the DMD wasn't tightly mounted on its connector. When the light engine was reconnected, the DMD was forced to clamp by the socket-like thing. That's why it functioned well with the light engine on. Also, I fixed it up by using a metal plate to push the DMD uniformly.

    Hope this will be useful for future reference.

    Best,
    Zeren
  • 0 in reply to Zeren Lin
    TI__Genius 11325 points
    Hi Zeren,

    Glad you were able to resolve your problem. Thanks for posting your resolution.

    -Clinton