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DLPC4422: DLPC4422 Pulldown and Refresh Rate Options

Dylan Seeger
Prodigy 80 points
Part Number: DLPC4422
Other Parts Discussed in Thread: DLP660TE, , DLP470NE

Hi,

I noticed in the DLPC4422 white paper that this display controller "Supports 24-30 Hz and 47-120 Hz Frame Rates". Two of these controllers need to be used in conjunction with the DLP660TE TRP DMD. My question relates to the a 24p signal being sent to a projector with this combination of hardware. I recently had an Optoma UHD65 projector which uses these display controllers with the DLP660TE TRP DMD but there seems to be 3:2 pulldown occurring with a 24p input sent to the projector. This projector forces the XPP actuator to be enabled at all times. The image is always scaled to UHD and displayed through the projector via XPR. There is no support for 1:1 pixel mapping at this DMD's native resolution. My question is; does the DLPC4422 combined with the DLP660TE TRP DMD with XPR enabled allow for 2:2 (or higher) pulldown to properly display this type of signal or is everything forced to be displayed at 60p with 3:2 pulldown being forced due to the use of XPR? I'm just curious if this is a limitation of this controller and DMD combination or if this is the fault of Optoma in how they're handling your hardware?

Any help is much appreciated!

Thanks,


Dylan

  • 0
    TI__Intellectual 2025 points

    The DLP660TE is intended for use in a 4K UHD system and supports UHD displays. Furthermore, these displays must run at 50Hz or 60Hz. The front end processor will convert any input frame rate to either 50Hz or 60Hz.If the input is an integer multiple of 50Hz or 60 Hz, the front end will use 2:2 pulldown, otherwise it will use 3:2 pulldown. These configurations are not currently programmable. Any source with a resolution lower than UHD will be upscaled by the front end processor to UHD. The DLPC4422 controller does allow different levels of control to drive the DMD, but it’s the decision of the system integrator on how to configure the final system.

  • 0 in reply to Benjamin Uhing
    Prodigy 80 points

    Thank you very much for the response. When you said the controller allows for different levels of control to drive the DMD, what exactly are you referring to? Could you give me an example of how a system integrator might alter how this controller is setup with stock settings?

  • 0 in reply to Dylan Seeger
    TI__Intellectual 2025 points

    Dylan,

    In about a month, we are planning to post a new TI Design for our DLP470NE product which will include a Programmer's Guide. This Guide is a list of changes a system integrator can make to a stock DLP442x controller. Would it be alright with you if I get back to you when this document has gone through final review and has been posted? I think having these specific examples will be very useful in answering your questions.

    Regards,

    Ben

  • 0 in reply to Benjamin Uhing
    Prodigy 80 points

    Sure, I don't mind waiting. I'm most interested in hearing if proper 2:2 puldown (or higher up to 5:5 pulldown via 120hz refresh) will be possible down the road with this updated through the Programmer's Guide. I'm interested in this because this DMD and controller are being used in projectors marketed as "home theater" projectors, so the omission of proper 24p support is a little concerning.

    Thanks!

  • 0 in reply to Benjamin Uhing
    Prodigy 80 points

    I see the programmers guide has been released.  The only mention of frame rate control or manipulation is for internal test patterns.  Can you please confirm if proper 24p support at an interval of 24hz is possible or if this DMD and controller are locked to 50/60hz refresh only.

  • 0 in reply to Dylan Seeger
    TI__Prodigy 720 points

    Dylan,

    With our latest SW release it is now possible for the system integrator to take 24Hz as input and configure the DLP system to run at 48Hz so as to do 2:2 pulldown. Can you please provide more detail about your project so we can assist you better. Are you in process of building the the whole system (EE and Optical engine) or you are working with one of our existing OEMs ?

    Regards

    Anshul