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DP to eDP

Tsvetomir Asenov
Prodigy 160 points

Hi, 
What is the main difference between DP and eDP. I am looking for differences and also for a suitable IC/bridge that converts DP to eDP interface for driving Displays. 

Thanks! 

  • +1
    Guru 301910 points

    The main difference is that DP specifies what cables to use, while eDP is designed for direct connections without cables.

    The electrical specifications are the same, so you can connect the two devices without any conversion.

  • +1 in reply to Clemens Ladisch
    TI__Guru**** 167886 points

    Hi,

    If you need signal compensation between DP and eDP, you can use DP141 or DP142 re-driver.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 160 points

    Hello, 
    Thanks for the information provided.

    I just wanted to investigate if there is a differences between  DP and eDP, or in other words to check if I can just wire them up onto a single PCB that has DP sink input and eDP output, in order to drive an LCD panel with eDP interface via DP from the video card output. 

    As far as I understood there is not difference in signals but I should sort and order the signals on a PCB between the DP and eDP, correct?

    Thanks, 

    Tsvetomir 

  • +1 in reply to Tsvetomir Asenov
    TI__Guru**** 167886 points

    Tsvetomir 

    As far as I understood there is not difference in signals but I should sort and order the signals on a PCB between the DP and eDP, correct?

    For main link, HPD, and AUX, these are correct. 

    Does the LCD panel have any backlight control requirement? The backlight can be controller through the AUX channel. But instead of using the AUX, a display panel can be implemented that allows use of the BL_PWM_DIM for backlight control. In addition, the panel can be implemented to allow backlight control by both the BL_PWM_DIM pin and EDP_BACKLIGHT_BRIGHTNESS_MSB/LSB registers. So you may need to build a backlight control on your PCB as well.

    Thanks

    David 

  • 0 in reply to David (ASIC) Liu
    Prodigy 160 points

    Hello David, 
    How about diff voltage swing levels, are they also compatible? 
    I mean the Display Port diff voltage levels to eDP voltage levels? 

    Thanks, Tsvetomir

  • 0 in reply to Tsvetomir Asenov
    TI__Genius 13300 points

    Hello,Tsvetomir,

    I am looking into your questions and will get back to you shortly.

    Thanks,

    Zach

  • +1 in reply to Zach Dryer
    TI__Genius 13300 points

    Tsvetomir,

    How about diff voltage swing levels, are they also compatible?

    The max allowable differential pk-pk voltage levels are compatible.

    Thanks,

    Zach