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What is the reflectance spectrum of the DLP chips 9000, 9000x, 9500, 9500UV and 7000?

Wei Zhu91
Prodigy 30 points
Other Parts Discussed in Thread: DLP9000, DLP9500, DLP9500UV, DLP7000, DLP7000UV

We are purchasing DMD chips for photopolymerization with UV (365nm), 405nm and other potential wavelengths. What is the reflectance spectrum of the DLP chips 9000, 9000x, 9500, 9500UV and 7000 from 300nm-800nm?

Thank you very much!

  • 0
    TI__Expert 6370 points

    Hi Wei,

    Check out note on wavelength transmittance through the different windows and . Please note that the visible DMDs you listed are Not intended to be operated in the UV spectrum and operation below 400nm would void the DMD warranty.

    Best regards,

    Trevor

  • 0
    TI__Expert 6370 points
    Wei,

    I apologize for the typo above, visible DMDs are not intended to be used in the UV spectrum. I corrected the statement above.

    Thanks,
    Trevor
  • 0 in reply to Trevor Dowd
    Prodigy 30 points
    Hi Trevor,

    Thanks a lot for your answer. Does this mean that all micromirrors used in different models (for example DLP9000 and DLP900UV) have the same reflectivity similar to aluminum? The only difference between the UV and visible models is the window glass?

    Thanks again,
    Wei
  • 0 in reply to Wei Zhu91
    TI__Expert 6370 points
    Hi Wei,

    I just wanted to clarify that there is not a DLP9000UV at this time, perhaps you meant the DLP9500 and the DLP9500UV.

    You are correct, the micromirrors do not change in reflectivity across devices. The main change between DMDs of different wavelength ranges is the window. Having said that, there are other changes between visible and UV DMDs which do not affect the optics, and DMDs should only be used within their given specifications.

    Best regards,
    Trevor
  • 0 in reply to Trevor Dowd
    Prodigy 30 points
    Hi Trevor,

    Thank you very much for your reply.

    Best,
    Wei
  • 0 in reply to Trevor Dowd
    Prodigy 40 points

    Hello Trevor,

    I read the above post with great interest as I am also interested in understanding the difference between the UV and visible version of the DLP9500 and DLP7000 devices.

    On Mouser, the price difference between the DLP7000 and DLP7000UV is approximately $1K vs $5K. It is very hard to understand that a different window glass is the only reason for this price difference. You state that the DMD mirror reflectivity is unchanged between these models.

    You also say, however, "there are other changes between visible and UV DMDs which do not affect the optics, and DMDs should only be used within their given specifications."

    What are these changes?

    Many thanks,

    Edward

  • 0 in reply to Edward Owen
    TI__Mastermind 43135 points

    Hello Edward,

    The micro-mirror reflectivity inside the package is effectively the same, but the windows are different.  Electrically they are also the same, but there are also process differences that enhance the resistance to UV light over exposure time.

    The UV enhanced parts are custom parts.  I suppose it would be possible to use a UV part in the visible, but that makes no sense monetarily.  However, using a visible part in the UV is NOT recommended.

    I hope this helps.

    Fizix

  • 0 in reply to Fizix
    Prodigy 40 points

    Hi Fizix,

    That's really interesting, thank you for responding!

    As i understand your comment, the most interesting difference between the UV optimised DMD's and those for the visible is in some kind of 'UV hardening' of the electronics in and around the DMD?

    Is that correct?

    Are you referring to the DMD chip itself, or the socket and PCB it connects through?

    Thanks for the information, it is certainly useful to clear up the differences between these product types.

    Ed

  • 0 in reply to Edward Owen
    TI__Mastermind 43135 points

    Hello Edward,

    The "hardening" is not in the electronics, but in the proprietary semiconductor process to build the superstructure and proprietary material inside the DMD space.  The details of both are TI trade secrets.

    Fizix