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Thread Contributor: desiredshoeScreen flash during power on

#1
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Has anyone figured out how to prevent the screen from flashing white during power on?
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#2
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Hi desiredshoe!

What TFT do you have?.

Please, show us some pictures of your hardware in order to get a more clear path of the solution.
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#3
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Apologies, I'm using a Teensy 3.5 with the 5" 800x480 HOTMCU display.  Running GD23Z code.  I've attached a video showing what is happening.  It's not a huge deal, I guess I'm just a little picky with these little things.

https://photos.app.goo.gl/TaRsrmjhRDuiB8re8
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#4
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I was going to upgrade to a Newhaven display but after emailing them about the issue, they are saying that their screens also do that. Must be because of the FTDI chip.

I wonder if I could split the display LED ground and hook it up to one of the digital inputs on the Teensy with a delay. Anyone think that would work?
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#5
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Better response on post RE: Screen flash during power onMaybe this issue is related to teensy 3.X board SPI architecture, in the STM32 Nucleo F767ZI + NHD 7" (FT813) this behavior is less visible

http://www.mediafire.com/file/qff61m1dlc...Issue.m2ts

Left: Nucleo F767ZI+NHD 7"
Right: Teensy 3.6 + NHD 5"

The NHD-FT813 TFT´s have more quality, you can connect with FFC20-pin@1mm-pitch or with the onboard header 20 pin@2.54mm-pitch

I suggest the sunlight readable series
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#6
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I think it's the initialization of the GD.begin(); because if I have this code...

delay(2000);
GD.begin();
delay(2000);
Serial.begin();

It will do nothing for 2 seconds, flash white then black and then 2 seconds later the screen will display the image. Going to break out the LED- pin from the display and connect it to a digital in and see how that works.
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