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  • TI Thinks Resolved

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

Prodigy 100 points

Replies: 19

Views: 322

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. 

  • In reply to Mayank Khandelwal:

    Hello,

    I have updated the firmware to the latest version, the same behavior persists.

    Regards,

    Ege

  • In reply to Mayank Khandelwal:

    Hello, 

    Unfortunately I cannot provide these plots as we do not have the equipment.

    I have updated the firmware as well and the behavior persists.

    Regards,

    Ege

  • In reply to user6481091:

    Ege,

    Did you change any default settings in the firmware. Were you seeing such behavior from the start itself, or is it something that was seen after making certain changes?

    Also, can you display a solid black Test Pattern using the Test Pattern Generator mode and let us know if the behavior still persists 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 Mayank Khandelwal:

    Hello,

    I haven't made any changes to the firmware. It was like this from the start, I have only just realized the severity, trying to photograph the propagation of the light inside the resin.

    The behavior persists with the solid black test pattern as well.

    Regards,

    Ege

  • In reply to user6481091:

    Hello Ege,

    Thank  you for your patience. It is holiday time holiday time for some of our team members. We will get back middle of next week on this subject.

    regards,

    Vivek

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

    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 Vivek Thakur:

    Ege,

    Per Mayank's comments above, you should try to project a solid black test pattern (with LEDs enabled) to determine whether the issue you are seeing is due to optical light leakage or a problem with the dynamic range of your video feed. 

    Using the Solid black test pattern will let you isolate the LED output from your video source. Meanwhile, you should try alternative video sources to see if you are outputting full dynamic range.

    In addition to this, I also recommend that you ensure CCA (Color Coordinate Adjustment) is disabled (command 0x86W, 0x87R)) and disable it if it is.

    I hope this helps.
    Regards,

    Philippe Dollo

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

    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 Philippe Dollo:

    Hello Philippe,

    I have the same issue with the solid test pattern, the surface is still lit up.

    I have made sure that CCA was disabled as well.

    What will I be looking at to test whether I am outputting full dynamic range?

    Thank you.

    Regards,

    Ege

  • In reply to user6481091:

    Ege,

    Dynamic range is something you would need to assess from your graphics card or frontend (such as Intel or Nvidia control panel). However, if you are seeing the issue with internal solid field test pattern then the issue is likely not related to frontend.

    In this case, it might be a good idea to understand what you are seeing. Do you have a luxmeter with which you can measure the black level of your light output?

    Regards,

    Philippe Dollo

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

    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 Philippe Dollo:

    Hello,

    I unfortunately do not have a means of measuring the light output.

    Regards,

    Ege

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