为满足大屏幕显示对触摸板的要求，克服现有交互式触摸板系统在性能及成本方面的不足，设计了一种应用光学系统成像原理和基于光学敏感器件PSD的新型触摸板。将触摸笔与触摸板接触点的红外点光源，通过透镜等组成的简单光学系统，成像于光学传感器，经过坐标校正等数据处理确定触摸点位置。系统设计结构简单紧凑、易于集成，具有很高的数据处理速度，灵敏度高，成本低，尤其适用于大尺寸、大面积触摸板的应用。

In order to meet the big screen displays requirements on touchpad and overcome the disadvantages of interactive touchpad on property and cost, a new type of touchpad technology was invented which was an application of optical system imaging principle as well as optical sensing device of PSD. The infrared spotlight source of contact point of touch pen and touch board imaging on the optical sensor through simple optical system consisted of optical lens and the location of the touch point will be determined by data processing such as coordinates correction. The low cost, easy integration, high sensitivity, high speed of data processing and simple system structure of the new touchpad can be applied to the big size and proportion of the touchpad.