There is Plasma, LCD and LED.
Plasma is now considered an old technology but it was loved for its deep blacks and speed.
LCD with a single backlight source (you'll see why I say this later) uses less power than plasma and eventually caught up when it came to contrast and speed. I have a Sony Bravia from 2009 that is universally praised by visitors for its picture quality.
LED is essentially an LCD TV with multiple LED sources that in some TVs also adjust in intensity as well as the LCD part of the screen. It has great contrast as different sections of the screen can be run with different illumination levels. An LED TV is NOT as some think an array of thousands of LEDs making up the pixels. LED backlighting comes in several flavours.
LED-backlit LCD display - Wikipedia, the free encyclopedia
One word of caution with modern TVs. My TV is praised because it is a capable set and I took the time to set up the picture properly. As delivered a modern TV is set up to be viewed in a big box store with many things set to 11 if you get my drift. You have to tone down everything to get a natural picture. Biggest mistake I see in TV setups are too much backlighting leading to white clipping, too much contrast and/or colour saturation and way too much sharpening. Watching the TV at my buddy's place is like having razor blades fired into your eyes.