LED or OLED?
Plasma TVs were the only flat-panel models available when they were first introduced more than a decade ago. They're now a dead category, and you won't see a major television manufacturer offering a new plasma television any time soon. That means your choices will mostly consist of LED-backlit LCD TVs (also simply called LED TVs), as well as much less common, much more expensive OLED displays.
There are further differences in the various designs. LED TVs can be either edge-lit or backlit. Edge-lit TVs light up their screens with arrays of LEDs along the edges of the panels, allowing the set to be thin and light. Backlit TVs use a large array of LEDs directly behind the panel, making the screen a little thicker, but allowing it to more evenly illuminate the panel and, for high-end screens, adjust individual LEDs to enhance black levels in scenes. Very good edge-lighting systems can produce excellent pictures, though, and TV manufacturers are making backlit LED arrays smaller and thinner, so the distinction means less than it used to. No matter the technology, an LED TV's thinness and brightness will be roughly proportional to its price range.
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