NHD-0420D3Z-FL-GBW-V3 Backlight



  • Official comment
    Engineering Support
    Community moderator

    Hi Theodore,

    If you have the data lines powered before supplying the main supply of the display, this may cause irregular behavior on occasion. Additionally, adding a delay at the start of your initialization sequence will help the power supply to settle.

    You mentioned that the backlight is on the day following turning the display on. Do you mean that the backlight turns on after a certain time after starting with no backlight? Also, If you power cycle your device, does the backlight turn back on or continue to stay off?

  • tbelo1


    I added a delay and waiting for the results.

    Forget my statement about the following day. 

    When the problem appears If I power cycle the device problem remains. Problem disapears after unknown times of power.cycling  the device.


  • Engineering Support
    Community moderator

    Hi Theodore,

    Thank you for the additional information, and I hope that the addition of a start-up delay solves your issue. Just for clarification, do you that the issue is still present when soft resetting or when the display is reconnected after being fully disconnected the system's supply? 

    Please let me know if you have any additional questions. Otherwise if you have concerns about your code, the linked example LCD code is a great resource for the NHD-0420D3Z-FL-GBW-3V.


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