Patent ID: 8872791

Claim:
A touch sensing device, comprising: a plurality of sensing circuit units to measure capacitance variations from a plurality of sensing electrodes; at least one time-to-digital converter (TDC) circuit to sequentially receive the capacitance variations from the plurality of sensing circuit units to generate digital signals by measuring a time required for a voltage signal corresponding to a capacitance variation of the capacitance variations to be varied to have a predetermined reference voltage; a calculating unit to judge a touch from the digital signals; a delay circuit to control, using a plurality of predetermined delay time periods, individual circuit units of the plurality of sensing circuit units to detect the capacitance variations during different respective time periods, wherein a first of the plurality of predetermined delay time periods partialy overlaps a second of the plurality of predetermined delay time periods, and wherein a time period length of each of the the plurality of predetermined delay time periods is based on a time required for the at least one TDC circuit to generate the digital signals and a time difference between a minimum time and a maximum time required for the voltage signal to be varied to have the predetermined reference voltage; and a switching circuit to control connections between the plurality of sensing circuit units and the at least one TDC circuit in synchronization with the plurality of predetermined delay time periods.