Replacing existing pic

[Freman]

It would be mounted behind the screen - the back side of the screen is a flat black - haven't tested it's reflectivity.

The other alternative is to use one piece of shiny 'something' on the back of the screen at the bottom (where it doesn't bend) and use 2 detectors.

Which of these would you use?
* Phototransistor (Say: http://tinyurl.com/5bspbk for example)
* Photodiode (Say: http://tinyurl.com/58wuwp for example)
* or a full on IR Receiver (Like: http://tinyurl.com/54vqs6) and PWM the IR led(s) to the right frequency.

Edit: Oooh, just found the Sharp IS471F proximity detector... that could be nice - cept for shipping - I can pick the other options up locally...