i actually though of doing this to my rear window...just so I could have pre programed annimations, flick off the jerk behind me, a little wave bye bye, stuff like that. It came out to be way too expensive and far too much work. So I am currently exploring a 356 color lcd, about 15 inches...it's compleatly clear untill you run voltage to it...I can make it more transparent by cutting the voltage down a bit, my only problem is I cant get it to run a composite signal if i can figure it out, it will only look like a small rise on the interior of the window