To get the right size TV for your room, take the distance from the TV screen to the place where you'll sit to watch it. Multiply that by .84 and you'll get a roughly 40-degree viewing angle, which is optimal according to the home theater mad scientists at THX.
When the word "class" follows the measurement, it's actually a half-inch smaller than the number. So, a 37-inch class TV measures 36.5 inches diagonally.
Since the death of plasma TVs several years ago, just about every TV you'll find in the store is some kind of LCD screen. LCD isn't something you have to specify. It's the default option.
LED: Standard LED is the basic backlight tech in most TVs. There's nothing wrong with it, but don't let the salesman try to sell it as a special feature. Unless noted, the backlight comes from the edges of the screen which may cause an uneven look.
LED with local dimming: This is a step up from regular LED that gives darker blacks than standard LED, which usually translates to better picture, but it can have its own issues, like streaks of light across the screen. It's not always a strict upgrade, so see it in person first if you can.
OLED: This is the top-notch backlight that offers the darkest blacks. It's great for contrast, but some viewers don't like the colors, which sometimes favor vibrance over accuracy. Scope it out in the store before Black Friday to see if the difference is worth paying for.
1080p (High-definition, or HD): This is as low as you should go when it comes to pixels for a TV in 2017. Only really budget models will go lower. This is fine if you watch a lot of older content (like DVDs), have a slow internet connection that's bad for high-res streaming, or you're just trying to get the lowest possible price. The term 1080p means that there are 1080 rows of pixels measured vertically up the screen.
Ultra high-definition, or UHD (4K or 2160p): Higher- resolution screens have four times the pixels of 1080p sets. It's worth the upgrade for most people at this point, especially if you're buying something over 50-inches. Just make sure you have a streaming box or Blu-ray player that will give you access to UHD content.
"Smart" means the TV can connect to the web and run apps natively to watch content without the need for an external box like a Roku, Apple TV, or gaming console. (You can make a standard television "smart" by just plugging one of those in it.)
Don't pay too much extra for "smart" functionality because very capable, 4K-ready media boxes typically have more features and cost under $100, especially on Black Friday.
High-dynamic range offers expanded colors and more details during playback. If you're moving up to 4K, this is worth some extra cash, as it makes a noticeable difference.
The two major HDR protocols are Dolby Vision and HDR10. Both are fine and many sets support both. Neither one is clearly better at this point.
You can never have too many HDMI ports. Count the things you want to plug into your TV and don't go lower.
The two common types of HDMI port you'll encounter are 1.4 and 2.0. For UHD televisions, you want at least 2.0 to get maximum color, resolution and framerate. For 1080p, 1.4 will work fine, but may have compatibility issues with newer, UHD media sources.
HDMI 2.1 is the newest protocol. It's futureproof for a bunch of crazy stuff that won't be real for a long time, like 10K resolution. It's not bad to have, but definitely not necessary.
Cheap HDMI cables are still fine. Look for the "high-speed" designation, but don't pay extra for a cable just because it says "4K" on the box. You don't need it.
This refers to the number of times the screen refreshes in a second.
120 Hz is standard, but 60 Hz is still common on cheaper sets.
"Motion smoothing" often makes content look like a soap opera and is best left off, so paying extra for high refresh rates is often a bad investment unless you're a heavy gamer, where smooth motion is better.
Retail prices on TVs are all over the place, so check a site like Amazon to make sure an inflated original number isn't making it look like a bigger deal than it is.
Paying extra for a specific brand is a bad strategy unless you have a compelling reason. Companies make wide ranges of TVs, some of which are better than others. Some brands like Westinghouse, Element, and Polaroid are exclusively value brands, but the heavy hitters like Samsung, Sony, and LG also make cheap TVs meant for low price points.
Don't forget to check for deals on things like mounts and other accessories you might need to accommodate your new TV, especially if it's a lot bigger than your old set.
If you miss out on the TV you want on Black Friday, hold out until Super Bowl season rolls around. Mid-January to early February is one of the best times to buy a TV, other than the day after Thanksgiving.