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Max on-to-off switching speed for DLP kits < 1 microsec?

Other Parts Discussed in Thread: DLP7000

I'm considering DLP micromirrors for an application requiring fast switching speeds for the entire array.  I need all the mirrors to be able to switch back and forth between on and off states at rates of < 1 microsecond.

 

I understand this will require global resets to update all the mirrors.  It seems to me that the global fps values of 22 kHz (I think this was XGA) and the DLP 4000 kit's 22k patterns/sec imply max on-to-off rates of ~ 45 microseconds.

 

Do any of the kits (Pico, 3000, 4000) have the ability to meet this < 1 microsecond switch rate?  If this is implied in the data in the online manuals, please point me to the proper section.

 

Thanks in advance for your time and for any help you could provide.

  • Blake,

    Unfortunately, the kits available today can not support the frame rate you are looking for due to the time it takes to reset the mirrors. The fastest rate currently is 32.5K patterns/sec which is about 30us.

  • quote

    I can't understand that you said dlp7000 has a fps 23k Hz,but I find the switching time of this equipment is 140 us ,in  other way ,it's fps is 7 k Hz,can you explain it for me? thankyou !

     pq

  • Hello pq,

    Welcome to the DLP section of the TI-E2E community.

    If the DLP7000 is operated at 400 MHz it is possible to achieve a global binary pattern rate of around 23 kHz.  What equipment are you using?

    The 140 µs listed int the DLP7000 datasheet is in error.  It was brought to our attention by another customer recently and is due for an update soon.  The number should be about 43 µs.  This is about 31 µs loading time plus 12 µs "mirror clocking pulse" plus µ-mirror settling time.

    Faster effective binary pattern rates can be achieved by operating the DMD in a phased mode.  This is analogous to the rolling shutter used on many cell phone cameras.  This allows the mirror clocking pulse and settling time to be "hidden" during the loading of adjacent µ-mirror groups.  This method has can approach an effective binary pattern rate near 32 kHz..  The caveat is that like the rolling shutter the image is not displayed all at the same time

    I hope this helps.

    Fizix

  • Fizix

    thankyou for your interpretation,I have getten it.

    pq