How to buy a TV: All you wanted to know in 5 points

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 5 big decisions you’ll face:
1. HD OR 4K?
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?