Most FPV displays are simple and small 7″ to 10″ LCD FPV monitor. They are portable, light weight, will generally run fine off the power from a 3S LiPo battery, and easy to hook up to the video receiver through RCA type AV cables.
The advantages to displays over video goggles is several people can be viewing one at once, they are inexpensive, and if you get motion sickness easy, might be a little easier on your stomach.
The disadvantages are the image is not as large or perhaps a better word is “immersive“ so you don’t get that same “in the aircraft flight experience”. They can also be hard to see outdoors during the daytime (even with display shades in place).