US 12,412,415 B2
Method for capacitive fingerprint identification, capacitive fingerprint identification apparatus and electronic device
Yi Liu, Shenzhen (CN); Dayu Ding, Shenzhen (CN); Zhichuan Liao, Shenzhen (CN); and Chao Yuan, Shenzhen (CN)
Assigned to SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed on Jul. 12, 2022, as Appl. No. 17/862,833.
Application 17/862,833 is a continuation of application No. PCT/CN2021/083033, filed on Mar. 25, 2021.
Prior Publication US 2022/0358781 A1, Nov. 10, 2022
Int. Cl. G06V 40/13 (2022.01)
CPC G06V 40/1306 (2022.01) 17 Claims
OG exemplary drawing
 
1. A method for capacitive fingerprint identification, wherein the method is applied to an electronic device with a capacitive fingerprint identification apparatus, the capacitive fingerprint identification apparatus is configured to be disposed on a special-shaped surface of the electronic device, the capacitive fingerprint identification apparatus comprises a pixel electrode array, the pixel electrode array is configured to form capacitance with a finger touching the special-shaped surface, the pixel electrode array comprises M columns of pixel electrodes, wherein each pixel electrode in the same column of pixel electrodes has a same distance from the special-shaped surface, M is an integer greater than 1, and the method comprises:
acquiring a number of driving signals N(i) of an ith column of pixel electrodes;
performing signal driving to the ith column of pixel electrodes to obtain an output voltage according to the number of driving signals N(i), the output voltage corresponds to the capacitor, and the output voltage is configured for fingerprint identification; and
wherein the number of driving signals N(i) corresponding to the ith column of pixel electrodes is positively correlated with a distance D between the ith column of pixel electrodes and the special-shaped surface, i is a serial number of the M columns of pixel electrodes, i is an integer greater than or equal to 1, and i is less than or equal to M;
wherein the number of driving signals N(i) of the ith column of pixel electrodes is expressed as:

OG Complex Work Unit Math
wherein the target value is a predefined average output voltage value of the M columns of pixel electrodes, Na and Nb are two different fixed number of driving signals, Na and Nb are integers greater than or equal to 1, and avgA(i) and avgB(i) are the average output voltage values of the ith column of pixel electrodes corresponding to the number of driving signals Na and Nb respectively.