Looks nice 
one thing I noticed from the video was, that when you type in part of the passcode without completing it, the display will wake up again with the last keypresses still present.
If it was me, i'd make sure to clear away any inputs when i switch off the screen, so any almost typed in passcode will not reamin there (making it easier for any intruders to guess the right digit to unlock the door).
very cool project though. I hope you'll make a little writeup, and let us know how it comes along 