Study on Calibration Algorithm of Embedded Touch Screen

摘要

This paper firstly analyzes causes and classification of the errors generated between touch screen and liquid crystal display (LCD). For the deficiencies of existing embedded touch screen calibration algorithm, five-point calibration algorithm (also known as multi-point mean calibration algorithm) is proposed. Then, the mathematical theoretical basis of the algorithm is introduced. Integer arithmetic instead of floating-point operations which can get better computing performance is proposed. Integer arithmetic can adapt to the characteristics and requirements of embedded devices. Meanwhile, deviation correction method is proposed to enhance the practicability of algorithm. Finally, the algorithm is implemented by program. Experiments show that the algorithm is accurate and has actual value.