A portable computer having a main body and a display panel hingedly attached to the main body, including an open/closed sensor to output open and closed detection signals in response to the display panel being open and closed, respectively; a power supply to supply a driving power to the display panel;...http://www.google.fr/patents/US7719528?utm_source=gb-gplus-shareBrevet US7719528 - Portable computer and controlling method thereof
