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Pico Projector as a binary display

Brice Thurin
Prodigy 10 points

Good Afternoon,

I was wondering if it is possible to drive the Pico projector with binary patterns and at which frame rate?

 

Many thanks

Brice

  • 0
    TI__Prodigy 190 points

    Hi Brice, did you ever get an answer to your question?  You might try checking the information at www.dlpdiscovery.com if you haven't tried that, yet.

  • 0
    TI__Prodigy 450 points

     

    Hi,

    The input to the Pico must be configured in VGA. See the http://beagleboard.org/pico page for displaying content on the Pico.

    Currently the Pico kit supports a frame rate of up to 60Hz.

     

  • 0 in reply to tsolo
    Prodigy 70 points

    Even if the Pico kit can only support full frame refresh at 60Hz, can it do a partial frame refresh faster? Is the data is the framebuffer only read 60 times per second?

  • 0 in reply to Peter B.
    Intellectual 270 points

    I think you'd have to write your own FPGA code, replacing the standard code in the processor FPGA in order  to drive the DLP chip directly to get faster updates.

    As the standard DLP processing system uses pulse-width modulation to do greyscaling, it ought to be possible to get significantly higher rates for mono, but could be quite a lot of work.

     

  • 0 in reply to Peter B.
    TI__Expert 3425 points

    Hi Peter,

    The refresh rate of binary patterns on the DMD in the Pico kit is not driven directly at the input interface.  The assumed input is a "video" like signal.  Therefore, driving partial images would not increase the refresh rate.  If you were to use the Discovery 4000 platform, this platform allows you to more directly access the DMD in a pattern mode, and supports refresh rates of binary patterns > 25KHz for full DMD loads.  THis might be an option for you.

    I suppose that you have an application needing the "Pico" level lumens and resolution, but with the binary pattern interface.  Is this true?

     JRT

  • 0 in reply to Jason Thompson
    Prodigy 70 points

    Right, I'm interested in a small projector that shows a looping pattern with about 500hz refresh. The Discovery 4000 is a bit overkill, but I suppose there is no cheaper middleground. Using a consumer DLP with no color wheel may be enough (kind of like 360hz, with some constraints that may not matter to me), which is what I'll try first.

  • 0 in reply to Peter B.
    TI__Expert 3425 points

    Peter,

    OK.  Thanks for the feedback.  We will keep this in mind going forward as we do not have EVM kit that would immediately address your needs.

    JRT