Patent ID: 11954287
Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 11:
12. A method for self-capacitor sensing in a touch panel array integrated with a display panel, the method comprising:
generating an error signal responsive to a sinusoidal driver signal and a channel feedback signal;
generating K sinusoidal input currents based on the error signal, the K sinusoidal input currents being nominally identical, K being an integer greater than two;
for each of a plurality of rotation cycles, cycling through K frames by, for each kth frame:
sequencing a unit current rotator into a kth configuration of K configurations, each configuration defining a unique one-to-one coupling between K rotator inputs of the unit current rotator and K rotator outputs of the unit current rotator,
wherein each of the K rotator inputs is coupled with a respective one of the K sinusoidal input currents, and each of the K rotator outputs is coupled with a respective one of K branches, each of the K branches to couple with a respective one of a plurality of touch sense channels of the touch panel array, such that each of the K branches receives a respective sinusoidal branch current that is sourced by each of the K sinusoidal input currents for 1/Kth of each rotation cycle; and
updating the channel feedback signal based on one or more respective branch voltages from one or more of the K branches, the one or more respective branch voltages arising on the one or more of the K branches responsive to the respective sinusoidal branch current on the one or more of the K branches.