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DLP4500: DLP image projection inhomogeneities

Aurélien Duboin
Prodigy 15 points
Part Number: DLP4500

Tool/software:

Dear TI team,

At Alvéole we are integrating DLP4500 products into our PRIMO device which enables to project images and achieve photopatterning of proteins on surfaces.

We have been observing in the past years quality issues in the DLP image projection with non homogeneities within a DLP and variability from one DLP to another.

We basically shine the DLP with a collimated light beam and display a white image on the full DLP. We have a way to capture the projected image on a camera.

We observe dark striations and inhomogeneities in the intensity of the image projected by the DLP. All chip tested have been tested with the same light source so the discrepancies are linked to the DMD chip itself.

I suspect inhomogeneities on the coating on the windows which is in front of the micromirror array.

I compiled a report in the pdf underneath.

I would be glad to know if somebody already observed the same kind of issues.

Many thanks,


Aurélien Duboin
2024-11-15 - Report DMD quality assessment ALVEOLE.pdf

  • 0
    TI__Intellectual 1060 points

    Hello ,

    Thank you for reaching out and using the E2E forums! An expert from our team will review the thread and get back to you shortly.

  • 0
    TI__Mastermind 49155 points

    Hello Aurélien,

    We want to understand the operation.  From the post above you wrote, "We basically shine the DLP with a collimated light beam and display a white image on the full DLP." So the effective input NA is very small.  What is the output NA (f#)?.  In other words is the output also effectively collimated? 

    If this is the case, there are minor variations in production that will not show up in most projection systems, but with small NA systems, slight variations might show up.  If you would like to have a phone conference with our team please send a friend invite.

    Fizix

  • 0 in reply to Fizix
    Prodigy 15 points

    Hi Fizix,

    Thanks for your feedback.

    The light beam is collimated also at the output of the DLP.

    However, the DLP is integraded in a device which we plug to the back port (infinity port) of an inverted microscope. We then optically conjugate the DLP with the focal plane of the objective of the microscope so as to get the image projected by the DLP in focus on the same plane as our sample on the microscope.

    It would be great indeed to have a phone conference with your team. I will be available tomorrow or next week and just sent you an invite.

    Best,
    Aurélien

  • 0 in reply to Aurélien Duboin
    TI__Mastermind 49155 points

    Hello again Aurélien,

    It will have to be next week as I took ill yesterday and I am still under the weather today.  Let me arrange a meeting, because this definitely needs the optical team.

    Fizix

  • 0 in reply to Fizix
    TI__Mastermind 49155 points

    Hello Aurélien,

    We have connected via email and will continue our interaction there.

    Fizix