Patent ID: 11899876
Assignee: TOUCHNETIX LIMITED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A touch-sensitive apparatus, the apparatus comprising:
a plurality of drive electrodes, comprising at least a first electrode and a second electrode;
at least one receiver electrode;
drive circuitry configured to generate a first time-varying voltage signal and a second time-varying voltage signal, wherein the first and second time-varying voltage signals are the inverse of one another; and
control circuitry configured to:
perform a first measurement on the at least one receiver electrode during a first time period, wherein the control circuitry is configured to supply at least one of the first and second time-varying voltage signals to the first and second drive electrodes during the first time period;
perform a second measurement on the at least one receiver electrode during a second time period, wherein the control circuitry is configured to supply at least one of the first and second time-varying voltage signals to the first and second drive electrodes during the second time period; and
determine a resultant signal corresponding to the mutual capacitance between the first electrode and the at least one receiver electrode based on both the first measurement and the second measurement,
wherein the plurality of drive electrodes is divided into groups of drive electrodes consisting of N drive electrodes, and wherein, when the plurality of electrodes divided by N is not equal to an integer, the control circuitry is configured to include at least one drive electrode in two groups; and
wherein in at least one of the first time period and the second time period, the control circuitry is configured to supply the first time-varying voltage signal, or the second time-varying voltage signal, to the at least one drive electrode included in the two groups, and to supply the other of the first time-varying voltage signal or the second time-varying voltage signal to at least one other drive electrode of at least one of the two groups.