What is the difference between full color and monochrome screen?

The difference between full-color and monochrome screen:

Full-color screen can display many colors, or all colors in our life, and can be used as a display. Many large LED outdoor displays belong to this kind, and the cost is high and expensive.

a monochrome screen is a screen that can only display one color, such as red, green, yellow, blue, etc., with a relatively simple display, which is commonly used in advertising signs of many merchants, and has low cost and cheap price.