A system for managing power states for a video display monitor for a computer during periods of operator inactivity senses the presence or absence of signals provided to the video display monitor for forming an image on the monitor, such as red (R), green (G), blue (B) and horizontal synchronization...http://www.google.de/patents/US5880719?utm_source=gb-gplus-sharePatent US5880719 - Low-power-consumption monitor standby system
