[blahedo]

I'm not sure what I'm missing here, but I'm pretty sure transparent LCDs have existed in commercial production for decades. For instance, back in the mid-90s (and possibly still today) they make displays that emulate TI-8x calculators and can be placed on an old-school overhead projector, for classroom use.

[baddox]

I thought all LCD's were somewhat transparent. They have backlights behind them, after all, and LCD projectors are clearly transparent.

[zbowling]

TI ViewScreen. :-)

I used to work at TI in the education/productivity group. Know way to much about it that monster. Worked on the model for the TI-Nspire for a bit. Software guy and not a hardware guy so I know very little how it worked.