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DMD Operation

Azhar Vellore
Prodigy 100 points

Hi, I am a graduate student working on a project. I have a question on the operation of DMD in a DLP Projector.

I made a powerpoint slide with a black background and just a white star at the center. I connected the computer to the DLP projector and instead of a mercury vapor lamp I used a laser pointer (used in presentations) as the light source. The beam diameter was only about 40% of the DMD chip area. I also removed the optics that focus the image after the DMD chip. What I noticed was strange. Instead of just one star which I was supposed to get on the output end, I was getting an array of them. 

So my question is, does the DMD in normal operation form multiple images in the micro-mirrors and then focuses all through the optics? Or Something else?

Waiting for your reply! :)

Thanks in advance!

Azhar

  • 0
    TI__Expert 6370 points

    Hello Azhar,

    The effect you are describing is the result of using a laser, a coherent light source, with the DMD. For more information on understanding diffraction as it relates to the DMD, I would suggest reading “Using Lasers with DLP DMD Technology,” here: www.ti.com/lit/dlpa037

    Please let us know if you have any other questions!

    Regards,

    Trevor