The first so-called LED TVs were local-dimming models, where the LEDs behind the screen could be dimmed or brightened in different areas to correspond to darker or brighter areas of the picture. The result was excellent contrast, on a level no other LCD-based TV could muster. Since 2008 when these TVs debuted, they've remained uncommon and expensive while so-called edge-lit models have populated store shelves and living rooms with abandon.
The XBR-HX929, Sony's most expensive and, we're willing to guess, best-performing TV of 2011, is also the company's only local dimmer. It boasts that excellent contrast by way of inky black levels not found on any TV aside from the oft-cited Pioneer Kuro plasma, and improves upon the color accuracy of its predecessor XBR. In short, it represents the pinnacle of LCD picture quality, so if you're shopping in the extreme upper end of the TV market and were only going to consider plasma, the XBR-HX929 might change your mind.
Read the full review of the Sony XBR-HX929 series.