Power settings for monitors can be set via the procedure for computers. It doesn’t take much energy to power up a monitor, and the Department of Energy recommends that you turn off your monitor manually or automatically if you will be away from your computer for more than twenty minutes.
The two main types of computer monitors in use today are cathode ray tube (CRT) and liquid crystal display (LCD) monitors. In the past, CRTs displayed better colors, refreshed faster, and were cheaper than LCDs. Although CRTs still cost less, LCDs have caught up in almost all other categories. LCDs are thinner and more environmentally friendly; they consume half the power and release only a small amount of heat. See LCD vs CRT – Pros and Cons for more detailed comparison.