公开(公告)号：US4764885A

公开(公告)日：1988-08-16

申请号：US856627

申请日：1986-04-25

申请人： Evon C. Greanias ,  Karl F. Schroeder ,  Louis V. Ruffino

发明人： Evon C. Greanias ,  Karl F. Schroeder ,  Louis V. Ruffino

IPC分类号： G06F3/153 ,  G06F3/033 ,  G06F3/038 ,  G06F3/041 ,  G06F3/048 ,  G08C21/00

CPC分类号： G06F3/0418 ,  G06F3/03545 ,  G06F3/038 ,  G06F3/041

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

摘要翻译： 公开了一种用于与位于显示装置的观察表面上的图形输入网格覆盖层一起使用的最小视差触笔检测子系统。 本发明具有三相操作，其中在第一阶段期间，触针距显示器的观察表面处于远离距离，因此不显示触针位置的表示。 在第二阶段期间，将触控笔置于与显示器的观察表面之间的第一阈值距离内，在该第一阈值距离内，生成精确定位在显示器上的光标图像，该显示器对应于检测到的触控笔的位置。 在本发明的第三操作阶段期间，将触针置于显示器的观察表面附近，在此期间将光标图像从显示器移除，并且触控笔的路径相对于显示器的实际轨迹 显示图形输入网格覆盖图。 以这种方式，操作者可以将注意力集中在光标的显示位置，而不是在触控笔的物理位置上，从而最小化触针相对于显示图像的位置的视差误差。