The biggest trend in TVs today is 4K, also known as ultra HD. It’s the latest bid to improve the sharpness and detail of big screen sets, offering about four times the number of pixels of HDTV. And as it has rapidly become the standard for TVs, it’s also spreading to game consoles, laptops, smartphones and camcorders.

The amount of 4K content, however, has not been growing as fast as the number of screens (but it’s coming). That doesn’t mean there’s no use for the new sets: All 4K TVs upscale regular HD content for a near-ultra-HD viewing experience. Furthermore, many 4K TVs support a new, wider color format called high dynamic range (HDR) that delivers many more colors and more intense colors. That means an attention-grabbing picture with more details in bright and dark areas of the picture.

Here’s everything you need to know about 4K or ultra HD but were afraid to ask.
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https://www.tomsguide.com/us/4k-tv-explained,news-17877.html