At the very top of Sony's high-performance XBR series of TVs are the Ultra High Definition models like the XBR-55X900A. Here's a TV that can enhance the quality of everything you watch, with a screen that has four times the resolution of a regular "full HD" 1080p TV. Sony teams this 4K screen technology with a new type of LED backlighting that provides more depth and shades of color than you've probably ever seen before.