Patent ID: 6377249
Filing Date: 2002-04-23
Classification: G06F

Abstract:
An electronic light pen assembly for use in conjunction with a video display having a plurality of pixels thereon, said assembly comprising:light gathering optical means for receiving light emanating from a video display screen, including at least one photo sensitive detector against which said light from said video display screen is directed; circuit means for receiving signals from said at least one photo sensitive detector, for processing said signals, and for transmitting data signals whose value is determined by the light received from said video display screen by said at least one photo sensitive detector at any instant in time; computer means for receiving said data signals and providing information as to the value thereof; wherein, at any instant in time, said video display screen and said computer means are linked together; and wherein, at any instant in time, when said electronic light pen is directed at any pixel or group of pixels on said video display screen, a data signal providing information as to the light received from said pixel or group of pixels is transmitted to mapping software resident in said computer; whereby, upon successive iterations of a sampling sequence under the control of said mapping software, the position of said pixel or group of pixels on said video display screen can be determined and mapped.