DLP4710EVM-LC: The areas in the projection that are supposed to be black are too bright.

Prodigy 90 points

Replies: 18

Views: 218

Part Number: DLP4710EVM-LC

I use the dlp for 3D printing purposes and I project black and white images onto the resin surface. However the areas that are black on the image are still lit up by the projector to some degree. I have attached the image I send the projector and the resulting projection. 

Any insight into why this occurs and how it can be fixed would be greatly appreciated. 

18 Replies

  • Hello,

    Welcome to TI E2E forums and thanks for showing interest in the DLP Technology.

    Can you please confirm that you are displaying the patterns using external pattern mode only? If yes, kindly share the screenshot of your pattern configuration details.

    Regards,

    Mayank

    If a post answers your question, please click on "Verify Answer" button

    Have any questions about DLP Pico Chipsets? Check out the DLP Pico Universal FAQ for quick answers: https://e2e.ti.com/support/dlp/f/94/t/946506 

  • In reply to Mayank Khandelwal:

    Hello,

    as far as I can tell, I am not using any patterns. To display the image I set the projector as a second monitor and make the image full screen there, if that information helps. I am attaching screenshots of the tabs under light control. Hope that helps.

  • In reply to user6481091:

    Hello,

    Do you have similar issues with contrast when using an internal pattern (a black/whie checkerboard test pattern for example)?

    Kindly,

    Austin

    --------------------------------------------------------------------------------------------------------

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    Have questions about DLP Pico Chipsets? Check out the DLP Pico Universal FAQ for quick answers: https://e2e.ti.com/support/dlp/f/94/t/946506 

  • In reply to Austin Snyder:

    Hello,

    the same issue persists with the internal patterns as well. I could not photograph the checkerboard well with my camera, but I have attached the image when I choose "solid color, black" pattern.

    Regards,

    Ege

  • In reply to user6481091:

    Hello Ege,

    Kindly let us know the firmware that you are currently using. We will try to reproduce the issue at our end.

    Regards,

    Mayank

    If a post answers your question, please click on "Verify Answer" button

    Have any questions about DLP Pico Chipsets? Check out the DLP Pico Universal FAQ for quick answers: https://e2e.ti.com/support/dlp/f/94/t/946506 

  • In reply to Mayank Khandelwal:

    Hello,

    You can find the photo of the information page below. Sorry about the delayed response, I didn't have access to the device for a while.

    Regards,

    Ege

  • In reply to user6481091:

    Hello Ege,

    Thank you for the information above. We are investigating this issue.

    Would you be able to measure the light output of the solid, black pattern with an oscilloscope and photo-detector? We would be interested in seeing these plots if possible.

    Kindly,

    Austin

    --------------------------------------------------------------------------------------------------------

    If a post answers your question, please click the "Verify Answer" button.

    Have questions about DLP Pico Chipsets? Check out the DLP Pico Universal FAQ for quick answers: https://e2e.ti.com/support/dlp/f/94/t/946506 

  • In reply to Austin Snyder:

    Ege, 

    In addition to what Austin mentioned, I would encourage you to move over to the latest firmware version (v8.1.0) that is available on ti.com and check you are still the same behavior or not.

    Regards,

    Mayank

    If a post answers your question, please click on "Verify Answer" button

    Have any questions about DLP Pico Chipsets? Check out the DLP Pico Universal FAQ for quick answers: https://e2e.ti.com/support/dlp/f/94/t/946506 

  • In reply to Austin Snyder:

    Hello,

    I don't have the necessary equipment but I will ask around to see if the other labs do. I will keep you updated.

    Regards,

    Ege

  • In reply to user6481091:

    Ege,

    Yes, before that kindly switch over to the latest firmware version and check out the behavior.

    Regards,

    Mayank

    If a post answers your question, please click on "Verify Answer" button

    Have any questions about DLP Pico Chipsets? Check out the DLP Pico Universal FAQ for quick answers: https://e2e.ti.com/support/dlp/f/94/t/946506