Sony has announced plans to introduce 3D televisions to market in 2010. The LCD sets will use “active shutter” technology—the viewer wears electronic glasses that rapidly open and shut to provide the 3D illusion. But there are several competing 3D formats, and the company runs the risk of becoming involved in another Beta vs VHS battle. Not to mention the potential backlash from consumers who are only now coming around to HD and Blu Ray.