Lets the display go for another frame: the connection is marked closed at once, and the device itself closed behind whatever is already queued for it.
The pins are left as they are: the frame that asked is about to draw.
Resolves once the device is closed, or null when this frame holds no display
Takes the display up again, given back by a frame that asked for it and then could not open it.
What a frame's connection does when the handoff asks it to.