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

Claim 0:
1. A system for self-capacitor sensing in a touch panel array integrated with a display panel, the system comprising:
an alternating-current-mode (AC-mode) bridge comprising:
an error amplifier to generate a loop control voltage responsive to a sinusoidal driver signal and an error feedback signal;
a first branch to couple with an ith channel of a touch panel array having an ith channel self-capacitance (Ci_i), and a second branch to couple with a jth channel of a touch panel array having a jth channel self-capacitance (Ci_j);
a set of adjustable current sources configured, based on the loop control voltage, to output a first sinusoidal current to the first branch and to output a second sinusoidal current to the second branch,
wherein the first branch manifests a first branch voltage responsive to applying the first sinusoidal current to Ci_i, and the second branch manifests a second branch voltage responsive to applying the second sinusoidal current to Ci_j, the error feedback signal being a function of the first branch voltage and the second branch voltage; and
an output amplifier to generate an ith output voltage (Vout_i) based on a difference between the first branch voltage and the second branch voltage.