CHIBA, Japan — Japan's big name electronic manufacturers are readying flat-screen TVs that can show high-definition movies and video games in 3D for launch next year.

At the country's biggest consumer electronics show that opened Tuesday just outside of Tokyo all the major makers displayed 3D prototypes. Sony and Panasonic said they would bring their first models to market next year.

The companies are plowing ahead even before there is much content available, with corporate spokesmen saying only that preparation is under way. Demonstrations at the exhibitions were mainly short clips of movies, nature scenes and sports.