[IDEA] [Tut] How to turn off Backlight of a Waveshare 7" HDMI LCD using GPIO and screensaver

[tridy]

(8th Feb, 2017 08:25 AM)f1vefour Wrote:  That is a nice way to interface with the switch.

I don't think undervolting the display is the right way to go about dimming it but I don't know of another way.

Well, you sort of can fake it by doing it programmatically. When the command comes, put a black rectangle on the top of the screen and gradually change the opacity, making it all the way from transparent to fully black. Only after that is done, make the relay do its job.