Minimun parallax stylus detection subsystem for a display device

摘要: A minimum parallax stylus detection subsystem is disclosed for use with a graphic input grid overlay which positioned on the viewing surface of display device. The invention has three phase operation wherein, during first phase, at remote distance from and therefore no representation position displayed. During second brought within threshold display, cursor image generated precisely corresponding to detected stylus. third invention, close proximity removed an actual trace path respect shown. In this manner, operator can focus attention displayed location instead physical stylus, thereby minimizing error in image.