Screen starts to flicker when brightness is raised above a certain value

[Emilmart]

Hi everyone,

I can print nice pictures & transitions on the display of my custom board.

But when I'm rasing the brightness of the display (by setting the PWM backlight value), at a certain value the screen starts to flicker. Controls are shaking and if I continue to raise the brightness it flickers more.

Below that critical value it's working well, as you can see on the pictures joined.

I'm using a LCD TFT (parallel interface) with external SDRAM & TouchGFX.

What could cause this ?

Thanks

[Emilmart · Accepted solution]

solved, it was my input voltage that was dropping due to bad connectic

[Romain DIELEMAN]

Good to hear it works, thanks for sharing 👍

/Romain