Research on multi-degree-of-freedom and high-precision touch screen characteristic test instrument

This paper takes the touch screen characteristic test as an example, Through the multi-dimensional automatic motion platform, the test pen is driven to move on the touch screen according to the set trajectory. The actual feedback track of the touch screen control board is compared with the previously given track, and the test error is passed. To judge the touch screen's touch sensitivity and linear accuracy. The test system selects the upper computer and the lower computer to control the mode. The upper computer software is used for data acquisition and master control. The upper computer adopts the project database management mode. It can perform the playback analysis and waveform display of the original data of each movement; the lower computer takes The PLC and the three-degree-of-freedom motion slide, etc., control the entire equipment operation by controlling the PLC and the step controller through the host computer software. Through the management system software, motion data and curves can be displayed in real time, data is stored to the database, and the history is played back.