I picked up one of the SLD62445P 2.8" TFT TouchScreen shields at radio shack to play around with and possibly use in a project I’m working on.
However I’ve come across at least one problem so far that I’m trying to figure out a way around. The screen is always on. I need it to turn off sometimes or at least go into a lower power usage mode and not give off light. Now I know I could simply cut the power to the screen in order to achieve this, but I’m trying to avoid the delay redrawing the screen when reapplying power (it’s a substantial delay as this screen is a little slow at drawing).
The library for this screen is rather limited. It has the pure basics for drawing to the screen and that is about it. So I’ve been reading the ST7781R datasheet and trying to add some functionality to the library. Right now I’m working on trying to add the ability to put the screen into standby.
When I put the screen into standby or sleep however, instead of turning the display off and backlight off as one would expect it simply turns the screen white with the backlight on making it even brighter!
I tried turning the Display off on Display Control 1, but it does the same thing. White screen with backlight on.
Is there a way through commands to turn the backlight off and leave the color as black so that the screen appears to be off?