Transparent Display

So I've been desparately trying to find some kind of transparent display as part of a project I'm embarking on. I know they must exist because I used to have a transparent LCD clock, but I can't find any kind of break out...

Does anyone know where I might be able to buy one, or take on out of something like a digitial LCD clock? Or can I just remove the back of, say, an Adafruit LCD, to make it transparent?

There were transparent OLED displays (sold by 4D systems), BUT: 1. they discontinued the sale due to quality issues 2. they were not meant to support Arduinos oob but other languages (although some people succeeded to get some test sketches work with the OLEDs - google youtube transparent oled arduino)