LVDS output for custom screen display

Discussion in 'Android' started by agl, Feb 17, 2017.

  1. agl

    agl New Member

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  2. jas-mx

    jas-mx Active Member

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    Probably not unless the pins match up correctly. It would be easier to get the official 7" cable and convert for your use. Your 10.1 inch display may still require a controller to handle the LVDS signals correctly.
     
  3. agl

    agl New Member

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    Hi Jas-mx, thanks for your answer. :)

    We have selected the "LVDS 15" option as video output in Android settings, and of course we have create a cable for interfacing the pinout of the LVDS connector of the DUAL with the pinout of our screen, you can see the correspondance in the attachment "Interface-Screen-LVDS.png".

    You can see the result of our test in the attachment "pic.jpg".

    Do you see a wiring error ?

    Maybe it's only a "software issue" due to the select of LVDS15 output?
    We are able to build the Android ROM from source, do you know if we can change any uboot configuration file to display the signal correctly ?



    Interface-Screen-LVDS.png pic.jpg
     
  4. Andrea Rovai

    Andrea Rovai Administrator Staff Member

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    Hi @agl,
    I'm sorry but I didn't understand your problem. Also, why is your screen blue?
     
  5. agl

    agl New Member

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    For our project we need a display of 10.1" screen and to save space in our product we trying to plug it directly in the LVDS output of your DUAL board without a controller board.

    For doing this we have analysed the pinout of our screen and the pinout of your LVDS connector and we have make a custom cable for the connection. (As you can see in the attachment)

    We don't know why our screen is blue that's why we asking if there is a wiring mistake or if it's due to the configuration of the LVDS 15 in the linux kernel (https://github.com/UDOOboard/linux_.../arch/arm/boot/dts/imx6dl-seco_A62-lvds15.dts) ?

    Edit: Another question, are your LVDS (7" et 15") screens has a video controller board integrate ? Or it's only a screen display who is pluggable on the LVDS output ?
     
    Last edited: Feb 20, 2017
  6. Andrea Rovai

    Andrea Rovai Administrator Staff Member

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    Hi @agl,
    what display are you using?
     
  7. jas-mx

    jas-mx Active Member

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    From the software side you need to ensure the bus width and timings declared in the dts file (kernel) match your 10" display otherwise the output can be nonexistent or distorted depending on how skewed the values are. You can try altering the 15" dts file as a starting point, it needs to be compiled and repackaged for Android in the image. You also need to validate which kernel version the Android image is using to know which source tree to alter.
     
  8. MRWEB

    MRWEB New Member

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