电容屏稀疏触控检测方法研究

Study on Sparse Touching Detection for Capacitive Touch Screen

电容触摸屏是一种应用非常广泛的电子产品,但常规方法实现大屏幕电容屏的快速触控检测需要的硬件电路成本昂贵、且能耗高.首先给出电容测量的预充电转移电路,分析电容屏被触控瞬间的稀疏特性,并给出了电容屏触控稀疏检测原理,还讨论测量矩阵的硬件实现.提出了基于压缩感知理论的电容屏稀疏触控检测算法和实现策略.仿真实验结果表明了触控稀疏检测的有效性.所提算法在实现高效触控检测的同时,降低了触控检测电路成本和功耗.

Capacitive touch screens（ CTS） are widely applied in electronic devices. However,the fast touching detection by the conventional methods for CTS with a big size can only be achieved at the expense of the analog hardware complexity and power consumption. Firstly,the circuit for capacitance measurement by charge and transfer was introduced. Then the sparse feature of CTS at touched was analyzed,and the scheme of sparse touching detection was given. Moreover,the hardware implementation for measurement matrix was presented. An algorithm of sparse touching sensing for CTS and its implementation were proposed. The simulation test result indicated the validity of sparse touching detection. The proposed method can achieve touching detection efficiently with lower hardware complexity and lower power consumption.