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TDP142: Image retention

Tsvetomir Asenov
Prodigy 170 points
Part Number: TDP142

Tool/software:

Hello all, 
I am using TDP142RNQT to drive an 4K 15.6 eDP panel form my NVIDIA PC source. 
It worked okay, but after 200 hours approx I started to see image retention or ghosting. 

I am wondering if someone has already faced such issue, and also I saw that within panel spec, diff voltage is typically  550mV and max value of 650mV. 
On the other hand TDP142 output is 1500mV and cannot be changed. Thus I have difference two times between the panel specifications and what the redriver can provide which may cause the issue. 

Thanks! 

  • 0
    TI__Mastermind 30130 points

    Hi,

    I'm not aware of this issue happening in the past. Image retention is likely a product of the display itself rather than a DP re-driver in the signal path (TDP142).

    The 1500mV in the datasheet is the linearity range of our device, not the output amplitude. The output amplitude is directly correlated to the input amplitude, and is not set by the TDP142 itself. You can see how the output voltage varies as a linear function of the input voltage up to 1500mV:

    I recommend checking with your panel manufacturer to see whether they have seen this before. A re-driver like the TDP142 will only pass through data from the source to the sink, and should not cause visual artifacts like image retention.

    Best,

    Shane