A display arrangement comprises an image display device having two or more sets of images for display; a camera directed towards positions adopted by users viewing the display; a face detector for detecting human faces in images captured by the camera, the face detector being arranged to detect faces...http://www.google.com.tw/patents/US7636456?utm_source=gb-gplus-share專利 US7636456 - Selectively displaying information based on face detection
