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In this January file photo, Joe Stinziano, executive vice president of Samsung Electronics America, introduces a Samsung SUHD 4K TV at a news conference in Las Vegas. There’s an emerging picture standard that offers four times the pixels of today’s high definition. It’s known as ultra-high definition, or 4K. But do you need it? (AP Photo/John Locher, File)

TV Buying Guide: Get out tape measure before shopping (access required)

LOS ANGELES — If you're shopping for a TV, get out a tape measure and do some quick calculations before you head to the store. And count the number of gadgets you'll want to connect to your screen. Buying a TV is no longer just choosing how big a screen you want. Here are some big decisions ...