Patent ID: 11875006
Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. A method for self-capacitor sensing in a touch panel array integrated with a display panel, the method comprising:
(a) coupling a first branch of an alternating-current-mode (AC-mode) bridge to an ith channel of the touch panel array having an ith channel self-capacitance (Ci_i), and coupling a second branch of the AC-mode bridge to a jth channel of the touch panel array having a jth channel self-capacitance (Ci_j);
(b) generating a loop control voltage responsive to a sinusoidal driver signal and an error feedback signal, the error feedback signal being a function of a first branch voltage on the first branch and a second branch voltage on the second branch;
(c) generating first and second sinusoidal currents based on the loop control voltage;
(d) driving the first branch with the first sinusoidal current to manifest the first branch voltage based on Ci_i;
(e) driving the second branch with the second sinusoidal current to manifest the second branch voltage based on Ci_j; and
(f) generating an ith output voltage (Vout_i) based on a difference between the first branch voltage and the second branch voltage.