Sainsmart 7" screens and HMDI converter boards:
http://www.sainsmart.com/7-inch-tft-lcd ... 2av-1.html
In finest Chinese tat tradition they come with no instructions whatsoever, but they're only £30+VAT (in small volumes) and we need 'em now rather than whenever the official 7" screens come out.
Application: smart thermostat interface for a research project
We'd like to leave the "touch" element powered all the time, power down the screen when not in use, and have it wake up on touch. Failing that we'd like to keep the screen on but kill the backlight. Sending "black" is no good because the backlight remains powered and will illuminate half a room...
It's easy to drive a switch from a GPIO output to turn the lot on and off. Unfortunately, when you power on the screen, it displays the Pi output but also flashes up with the words "HDMI" in the top left corner for a couple of seconds. This would look a little naff if it happened every time you touched the thermostat.
Has anybody used one of these screens in anger, and found a way to either disable this message, or at least kill the backlight without killing the display driver part of the screen?