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DLPC350: Wrong resolution detected when in LVDS mode

Oliver Tedder1
Prodigy 20 points
Part Number: DLPC350

Hi,

We use the DLPC350 in conjunction with the DLP4500FQE, where we stream pattern information to it using the LVDS interface running in pattern mode (so that we can get pixel accuracy).  This has been working fine for some time.
The DLP4500FQE is end of life so we have had to upgrade to the DLP4500AFQE .  We were told that we need to also upgrade the firmware on the the DLPC350 to 4.1 in order to support this.
We have done this but now, the resolution of the video stream is being recognised incorrectly both in Lightcrafter and without our own software (that talks to the DLPC350 via USB):

In video mode it now shows:

where it is showing Horizontal resolution of 913 instead of the expected 912.

The windows display settings are correct, and how the resolution of 912.

Can you please tell us how to resolve this issue as it is quite critical for us?

Many thanks,
Oliver.

  • 0
    Intellectual 505 points

    Appologies, i don't think the images attached properly.  Here is how it looks on another system which is using the old DLP4500FQE.  The Horizontal resolution is 912 as we expect.

    ANd here is how it looks on the new system, where the horizontal resolution is incorrectly picked up as 915   (we have also seen it identified before as 913 as i mentioned above).

    A thought was that perhaps we need to update the EDID structure on our custom hardware to support the new part?  If so can you tell us how it should be changed?

    Many thanks

  • 0 in reply to Oliver Tedder
    TI__Mastermind 28005 points

    Oliver,

    It sounds like you are using the LightCrafter GUI with a custom board implementation, is that correct? 

    Will loop in the team to determine what additional measures need to be taken (if any) to support such a configuration.

    Regards,

    Philippe Dollo

  • 0 in reply to Philippe Dollo
    Intellectual 505 points

    Hi Philippe,

    Yes, we have a custom board configuration but this has been operating without any problems for well over a year.  This problem has only started recently with the upgrade to the new DLPC4500.

    Please note, that we either user our own software to talk to the DLP350 over USB, OR can also use your LightCrafter GUI application.  Both work.  In addition, both of them report the different horizontal resolution that we are seeing.

    Thanks,

    Oliver.

  • 0 in reply to Oliver Tedder
    TI__Mastermind 28005 points

    Oliver,

    Thanks much for elaborating. Have you upgraded the software AND the DMD, or just one (or the other)? 

  • 0 in reply to Philippe Dollo
    Intellectual 505 points

    We have developed our custom software for the old DMD. 

    Then we have tried to run the same custom software with the new DMD, and had the resolution problem. (everything else e.g. our custom DPLC350 carrier board, is unchanged)

    We have tried to run the new DMD with the old lightcrafter GUI version (3.1) and had the same problem.

    We have tried to run the new DMD with the new lightcrafter version (4.0 i think?) but also had the same problem.

    We had also ran the DLPC350 with the NEW DMD using the old firmware revision (3.1), and the latest one (4.1) but both show the same issue.

    Our custom EDID is also unchanged from when we were using the old DMD.

    Thanks,

    Oliver.

  • 0 in reply to Oliver Tedder
    TI__Genius 10925 points

    Hi Oliver, 

    Kindly help us understand the source of the issue better by confirming the below pointers:

    1. When the DLPC350 is used with new DMD DLP4500AFQE, irrespective of the FW used (3.1 or 4) you are always getting WRONG resolution over both USB and I2C.

    2. When the DLPC350 is used with older DMD DLP4500FQE, irrespective of the FW used (3.1 or 4) you are always getting CORRECT resolution over both USB and I2C. 

    3. There are no changes between the two boards except the DMD part. 

    Also, is it possible for you to try using HDMI input to see f you can reproduce the issue (just for experimental purposes, since I do not have systems with both type of DMDs with me currently) ?

    Thanks & Regards,
    Hirak.

  • 0 in reply to Hirak Biswas
    Intellectual 505 points

    Hi Hirak,

    We will try to get this data to answer 1 and 2.  We don't currently have provisions to query data over I2C, only over USB.
    For 3. I can confirm that the only change is the DMD part.

    Many thanks,

    Oliver.

  • 0 in reply to Oliver Tedder
    TI__Genius 10925 points

    Hi Oliver, 

    Thanks for the update! We will wait for you to get the info.

    Thanks & Regards,
    Hirak.