通过介绍基于光反射的大屏幕定位方法, 解释了视觉触控的实现原理, 搭建了大屏幕触控系统。针对大尺寸超大屏幕的应用和平板显示屏幕的大型化趋势, 研究了超大屏幕触控的小信号检测方法, 包括位置选行方法、背景跟随方法和屏幕抗重压方法。实验证明, 在不需要佩戴任何标记和传感器的条件下, 基于光反射的超大屏幕触控系统能够在 100英寸(1英寸=2.54 cm)的大屏幕上全屏绘图且不产生断笔与跳笔等现象, 触控系统的设计也为大尺度真三维人机交互奠定了实物基础。

By introducing big screen positioning methods based on light reflection, the principle of visual touch is explained and the big touch-screen system is built. For large-scale trend of FPD (Flat Panel Display), touch detection method based on small-signal is studied. Row selected, background followed and screen heavy pressure removal method are proposed. It is demonstrated in the experiments that large screen touch system based on light reflection achieves full-screen drawing on a 100-inch screen without wearing any marks or sensors and there are not drawing breaking and skipping phenomena. The design of touch system also lays the foundation for large-size volumetric human-computer interaction.