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  • Flash lightning at the lcd power on.

    Hello.

    I have a lighning flash at the lcd power on (uLCD_50d). I have added a magical code "gfx_Contrast(0); " in PreGenieInit. this improves behavior on power on but the flashing persist. Is there any way to prevent this flash.

    Thank you.

    Eric.

  • #2
    Hi,

    Welcome to the forum,

    Could you please let me know the full model name as shown in the comms tab.

    Best regards

    Paul

    Comment


    • #3
      Hello.

      Workshop 4 - test_boot_0_contrast(Gen4-uLCD-50DT, PORTRAIT)

      I have this problem for all of my projects. With Gen4-uLCD-50DT (My LCD of test), Gen4-uLCD-50D-SB (for my définive project), Gen4-uLCD-70D.

      Best regards.

      Eric.

      Comment


      • #4
        Please try the attached drivers and let us know how you go with them.

        Attached Files
        Mark

        Comment


        • #5
          Hello.

          To Gen4_uLCD-50D

          After driver upload (en4-uLCD-50D-A-D180809.4Drv), the the flash is still present
          https://youtu.be/iLCk1-xPPNE

          same LCD, after project upgrade with magiccode "gfx_Contrast(0);", the flash is still present
          https://youtu.be/zm-aftieVY0


          To Gen4_Ulcd-50DT

          After driver upload (Gen4-uLCD-50DT-A-D180808.4Drv), the flash disapear.
          https://youtu.be/hMdT-j95Dsg

          The project is the same on the two LCD models.
          If I could have the behavior of the 50DT on the 50D, it would be perfect :-)

          Best regards.

          Eric.

          Comment


          • #6
            Hello.

            Have you are a solution for the Gen4_uLCD_50D ?
            This project is for a vehicle dashboard, this flash is a problem for me for the perceived quality of the client.

            Best regards.

            Eric.


            Comment


            • #7
              Please try the attached
              Attached Files
              Mark

              Comment


              • #8
                hello,

                Great, the flash has disappeared. Thank you very much for your help.

                Eric.


                Comment


                • #9
                  Hello,

                  I am using a Gen4-uLCD-70DCT-CLB as a car instrument cluster. Just as above, my client is complaining about the flash at startup.
                  Is there a way to disable the backlight at startup? I could then manually turn it on once everything is operational.

                  Comment


                  • #10
                    Which display driver are you using?

                    If you are on the latest Workshop (4.6.0.21) the 180809 driver should be available and that should not have this issue.
                    Mark

                    Comment


                    • #11
                      Originally posted by ESPsupport View Post
                      Which display driver are you using?

                      If you are on the latest Workshop (4.6.0.21) the 180809 driver should be available and that should not have this issue.
                      Hi Mark,
                      Thanks for the reply.

                      I checked the driver and pmmc and they are the latest version, but the screen is white at startup. This is with using the UPA or IB board.

                      Click image for larger version

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                      Click image for larger version

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                      I can make a video of the effect if that helps?

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                      • #12
                        Yes please.
                        Mark

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                        • #13
                          Attached a video of plugging in the USB cable on the UPA.

                          VID_20200315_232156.mp4

                          Comment


                          • #14
                            Can you try with a standalone power supply (many USB cables do not provide enough power for a clean power up)

                            Can you take a photo of the back of the display?
                            Mark

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                            • #15
                              I just tried with a raspberry pi 3 power supply (2.5A) but it is the same. Attached a picture of the back of the display.

                              Click image for larger version

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