While the communication is Bluetooth, a protocol that does incremental drawing would allow to repaint only a small region at a time by comparing with the previous frame.
This does not play well with scrolling or animations, but a filter could be added to wait that the phone screen becomes still before sending the new frame, as a list of pixel that changed.
While the communication is Bluetooth, a protocol that does incremental drawing would allow to repaint only a small region at a time by comparing with the previous frame.
This does not play well with scrolling or animations, but a filter could be added to wait that the phone screen becomes still before sending the new frame, as a list of pixel that changed.