The Samsung USB Monitor is soon to be the most energy efficient monitor on the market. This monitor is powered solely by your computer via USB port.
I never gave much thought to the fact that a computer monitor is actually plugged in and using power until I saw the Samsung USB Monitor. The monitor is 18.5" and has a life span of 30,000 hours -- 20,000 hours shorter than existing LCD LED monitors.
The Samsung USB Monitor is Powered by Your Computer
Michael Hines — June 1, 2010 — Tech
References: tinyurl & techon.nikkeibp.co.jp