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DLP4710: 1080 24p support

Kyungdahm Yun
Prodigy 40 points
Part Number: DLP4710
Other Parts Discussed in Thread: DLPC3439, DLPC4422

I'm curious if DLP4710 chipset can support 1920x1080 resolution at native 24hz frame rate without 3:2 pulldown. The technical spec says the maximum frame rate for the input signal is up to 60hz at 1080, but does not clearly mention that the output can be set to a lower rate.

In the mean time, I found a similar question on DLPC4422 saying that the chipset only recently got a firmware update for 24hz frame rate support with 2:2 pulldown, which might suppose the sibling DLP4710 didn't have 24hz support either.

  • 0
    TI__Expert 3240 points

    Hello,

    Thanks for using the DLP forums! The DLP4710 you reference is a 1080p DMD that uses two DLPC3439 controllers to drive it, not the DLPC4422. This is an entirely different chipset than the one referenced in the post you linked. Are you asking about a DLPC4422 configuration or a DLPC3439 set up? 

  • 0 in reply to Danny White
    Prodigy 40 points

    Sorry for confusion. I’m asking about a configuration on DLP4710 with DLPC3439. Just mentioned the DLPC4422 question because it was about the same issue on 24p support.

  • 0 in reply to Kyungdahm Yun
    TI__Expert 3240 points
    Pardon the delay. I have been looking into this and the chipset supports in two different methods depending on the configuration.
    1. In asynchronous mode where we display it at 60Hz
    2. In synchronous mode where we upscale the frame rate by x3. This take the 24Hz input to a 72Hz output

    I hope that helps!

    ~Danny W
  • 0 in reply to Danny White
    Prodigy 40 points

    Hi Danny,

    1. If I understood your answer correctly, asynchronous mode seems to force 3:2 pulldown for 24p input to display video at 60hz. Is that correct?

    2. In synchronous mode, can we get 1920x1080@24p video upscaled to 72hz? DLPC3439 datasheet specifically says it can support up to 62hz for both 1920x1080 and 1280x720 signals.

    3. Could you provide more information about synchronous/asynchronous mode switching? I couldn't find one in the datasheet.

  • 0 in reply to Kyungdahm Yun
    TI__Expert 3240 points

    Hello,

    I will be happy to clear this up for you. The 4710 EVM standard firmware supports asynchronous output of 60 Hz with an input of 24 Hz. This is not the same as 3:2 pulldown. I have had better results using synchronous mode. This requires a slight modification to the TI.com Firmware that I could help you with. Your input of 1080p @ 24 Hz should not be a problem. The output will be your data, but x3 the frame rate to 72 Hz.

    I hope that helps!

    ~Danny W

  • 0 in reply to Danny White
    Prodigy 40 points

    Hi Danny,

    I'm very curious how it can achieve 60hz output from 24hz input without 3:2 pulldown. Could you elaborate more on the mechanism please?

    1080p@72hz output from 24hz source sounds very interesting to me because that is what exactly I would like to get. In this case, I'd just want to double check if 62hz limitation specified on DLPC3439 datasheet no longer relevant.

  • 0 in reply to Kyungdahm Yun
    TI__Expert 3240 points
    I would have to do some more digging to get you the exact mechanism of the 60Hz. But the summary is that I did not see good results.

    The 62Hz @ 1080p refers to the max input data rate supported. The output is configurable based on certain settings .

    I hope that helps!

    ~Danny W