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DLP2010: Can I turn the DLP2010 on and off at really high speed? (60 times per second)

Young Min Cho
Prodigy 110 points
Part Number: DLP2010
Other Parts Discussed in Thread: DLPC3430

I want to build a system which uses camera, DLP2010 and Raspberry pi. My intention is to take a video of certain spot and then project beam to the same spot where camera captured. The condition I must follow is that camera shouldn't capture the beam projected by DLP2010, so I want to turn the DLP2010 off or eliminate beam while camera captures certain spot and when the process is done, then DLP2010 must project beam to that spot. This process should be repeated 60 times per second. 

Will this be possible using those components I stated at the beginning? If it is, can you tell where should I refer to in the datasheet?

Also I found about parking DMD in the datasheet. Is this related?

Thanks

  • 0
    TI__Expert 5485 points
    Hi Young

    Welcome to E2E and thank you for your interest in DLP technology.

    Our team will get back to you regarding your question soon.

    Thanks
    Azad
  • 0 in reply to Azad
    TI__Expert 5485 points

    Hi Young

    From what I understand, your requirement is to operate the DMD with an on-off cycle time of less than 16.67ms (ie. 1/60th of a second). Please note that this timing will be constrained by both the DLP2010 DMD and the DLPC3430/3435 display controller.

    At the outset, this does not seem possible to me. However, I will get back to you with a detailed analysis on this in a few days. You may refer to the power up and power down timing diagrams in both the DLP2010 and the DLPC3430 datasheets under the Power Supply Recommendations section to check whether this timing constraint is acceptable.

    DMD parking will affect the power down timing of the DLP2010 and can possibly affect the timing constraint for your system.

    Alternatively, you can consider whether your application actually requires switching off the DMD. You may instead, for example, project a black screen while the camera is capturing and switch to the camera input later. This could be implemented as the DLP2010 supports input frame rate of upto 120 Hz.

    Thanks

    Azad

  • 0 in reply to Azad
    Prodigy 110 points
    Thank you for your kind answer
  • 0 in reply to Azad
    Prodigy 110 points
    is the beam size controllable?
  • 0 in reply to Young Min Cho
    TI__Expert 5485 points
    Hi Young

    The display beam size cannot be controlled. It depends only on the distance of the projector from the screen.
  • 0 in reply to Azad
    TI__Expert 5485 points
    Hi Young,

    Switching on the projector within your required timing constraint is not possible. It takes 300-500 ms to power up the display controller and the DMD. Please proceed with the alternative option, ie. project a black screen while the camera is capturing and switch to the camera input later.

    Thanks

    Azad