This new LCD system from Sharp Electronics allows you to display different images on the screen when viewed off axis.

Sharp’s European laboratory has developed a system that takes advantage of a concept called the “parallax barrier,” which limits what light can be seen along specific angles. This principal has been used before in the development of Sharp’s 3D LCD panels. This latest concept provides greater control over viewing angles and has the potential to allow multiple viewers to watch different programs on the same tv at the same time based on their seating position.
[via Engadget]