Both sets work on infrared sensors placed near the screen that monitor a user's hand movements and convert them into commands for controlling the TV.

The Hitachi prototype enables users to turn the TV on and off with a wave, change channels by moving their hands from side-to-side and control volume by moving their hands in a circular motion.

The Toshiba TV employs three-dimensional hand gestures to allow users to navigate recorded video content. You can zoom in or out from a screen full of video clips by bring your hands closer together or further apart, start it with a gesture and then fast forward or reverse through the clip with side-to-side movements.

Toshiba said it was looking into the technology for possible use on its Cell TV, a TV set based on the powerful Cell processor. The TV is due on the market in Japan this year but the technology won't necessarily be in the first model.

Toshiba is keen to differentiate its TVs from lower priced competitors and sees such technologies as a way to do it.