Sensing methods for touch sensing devices

摘要

A sensing method for a touch sensing device is provided. In one embodiment, for one set of interlaced receiving electrode and transmitting electrodes of the touch sensing device, an integrator coupled to the receiving electrode is reset only one time. In another embodiment, for each group of sensing electrodes, an integrator coupled to the sensing electrodes is reset only one time. Accordingly, the rate at which the touch sensing array is sensed may be increased. Noise reduced by the process of resetting the integrator due to charge injection effects may be decreased.

主权项

1. A sensing method for a touch sensing device which comprises a touch sensing array and an integrator, wherein the touch sensing array comprises a plurality of receiving electrodes disposed successively and a plurality of transmitting electrodes disposed successively and interlacing with the receiving electrodes, and the sensing method comprises:
selecting one of the receiving electrodes to serve as a current receiving electrode; connecting the current receiving electrode to the integrator; resetting the integrator; and measuring output signals corresponding to one set of the current receiving electrode and the transmitting electrodes, wherein the step of measuring the output signals corresponding to the current receiving electrode and the transmitting electrodes comprises: providing a first voltage to a previous transmitting electrode among the transmitting electrodes; measuring an output voltage of the integrator in response to the first voltage on the previous transmitting electrode to obtain a previous integration value; providing a second voltage to a current transmitting electrode among the transmitting electrodes; measuring the output voltage of the integrator in response to the second voltage on the current transmitting electrode by the integrator to obtain a current integration value; and calculating the difference between the previous integration value and the current integration value to obtain the output signal corresponding to the current receiving electrode and the current transmitting electrode; wherein for the set of the current receiving electrode and the transmitting electrodes, the integrator is reset one time.