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LVDS to Digital RGB

Ehsan Ghaneie
Prodigy 10 points
Other Parts Discussed in Thread: DS90CF386

Hello,

I'm having some problems with my Display Driver Board.

The goal is to drive a panel with Digital RGB interface ( RGB x 8Bit + HSync + VSync + Clk ). The input interface to the Display Driver Board is DisplayPort v1.2.
Since I wasn't able to find a single-chip solution for this application, I ended up with the following two-chip configuration:

DisplayPort to LVDS (FPD-Link) using NXP PTN3460

LVDS (FPD-Link) to Digital RGB using DS90CF386

The display does produce an image, but there are two problems:

  • There are two vertically interleaved images superimposed with one slightly shifted (See picture).
  • The colors are not correct.

I have attached the datasheet for the display.

7701.2 inch 10TLM078(COM20T2M57XSB)_E_TENT_A.pdf

The clock signals as well as HSync/VSync are clean and there is no jitter.

What can possibly cause such behavior?
Are there other chips that would be more suitable for what I'm trying to accomplish (DisplayPort to Digital RGB) ?

  • 0
    Prodigy 30 points

    Hi Ehsan,

    You would know a lot more about this than I would but I thought I might mention it anyway in case it helps. Did you check your traces on the PCB are same length?

    Your signal can be clean but out of phase, so the colour information will arrive at different times for each of the channels.

    Thanks,

    Ibrahim