Gizmodo has posted a really cool proof-of-concept laptop prototype with an invisible AMOLED screen—but a stone's throw from those floating 3D displays of Avatar. Practical?
AMOLED (Active-Matrix Organic Light-Emitting Diode): “A display technology for use in mobile devices such as mobile phones. OLED describes a specific type of ultra thin, ultra bright display technology which doesn’t require a backlight and Active-Matrix refers to the technology behind the addressing of pixels. AMOLED technology continues to make progress towards low-power and low-cost large size (e.g. 40-inch) for applications such as TV,” Wikipedia.