I've been interested in this topic for a long time, but I'm stumped at this point. Maybe you guys can chime in and help. I've been looking for a license plate cover that electronically hides your rear plate. Preferably, I'd be looking for this exactly:

I have found the following sites/videos for sites (and others not listed):

And I want to make one myself. From what I understand, these use LCD glass that, once a charge is applied, turns opaque (not see through). These are all $150+ and I'd like to make one myself. There are WAY TOO MANY red-light cameras in NY and I want to beat the punch.

Any information is definitely appreciated.