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Image burn-in when using external long throw lens.

Dennis Presky
Prodigy 10 points

Have observed burn-in of what appears to be reflected I/R from a long throw lens placed in front of a DLP Pico Projector development kit. Burn-in is in the form of a round spot comprised of white pixels indicating that the aluminum metalization has been damaged. Could not find any info at the web site or from TI phone support.

Is a hot mirror between lens and projection module a likely solution?

  • 0
    TI__Genius 9935 points

    Dennis,

    Is this the Pico Kit v2 that you have? Did you replace the light engine? Or just the lens (for a long throw)? If you changed the light engine, what is the illumination source?

    The Pico Kit v2 light engine uses LEDs as RGB sources. There is no IR to worry about. However, if you substituted another light source, particularly a lamp, then IR can indeed be a concern.

    The primary concern from IR is heating. If the DMD is evenly illuminated, as it should be, then it is difficult to image how a round spot in the center could be affected.

    You will need to give a more complete description of your setup in order for us to understand what may be happening.