US 12,482,383 B2
Sensing circuit within a display and detection method of sensing signal
Zhiyi Chen, Shenzhen (CN)
Assigned to SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD., Shenzhen (CN)
Appl. No. 17/618,509
Filed by Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen (CN)
PCT Filed Nov. 5, 2021, PCT No. PCT/CN2021/128954
§ 371(c)(1), (2) Date May 4, 2023,
PCT Pub. No. WO2023/070730, PCT Pub. Date May 4, 2023.
Claims priority of application No. 202111264701.2 (CN), filed on Oct. 28, 2021.
Prior Publication US 2024/0038109 A1, Feb. 1, 2024
Int. Cl. G09G 3/00 (2006.01); G06F 3/042 (2006.01)
CPC G09G 3/006 (2013.01) [G06F 3/042 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A detection method of a sensing signal, comprising following steps:
in a display cycle of a first frame, reading a signal of a display panel to obtain a first sensing signal, wherein the step of in a display cycle of a first frame, reading the signal of the display panel to obtain the first sensing signal comprises following steps: reading the signal of the display panel for a first time to obtain a first sub-sensing signal, wherein the first sub-sensing signal comprises a first noise signal without photocurrent;
reading the signal of the display panel for a second time to obtain a second sub-sensing signal, wherein the second sub-sensing signal comprises the first noise signal and a first photocurrent; and
producing the first sensing signal indicative of the first photocurrent according to the first sub-sensing signal and the second sub-sensing signal;
in a display cycle of a second frame adjacent to the display cycle of the first frame, reading the signal of the display panel to obtain a second sensing signal, wherein the step of in the display cycle of the second frame, reading the signal of the display panel to obtain the second sensing signal comprises following steps:
reading the signal of the display panel for a first time to obtain a third sub-sensing signal, wherein the third sub-sensing signal comprises a second noise signal without photocurrent;
reading the signal of the display panel for a second time to obtain a fourth sub-sensing signal, wherein the fourth sub-sensing signal comprises the second noise signal and a second photocurrent; and
producing the second sensing signal indicative of the second photocurrent according to the third sub-sensing signal and the fourth sub-sensing signal;
wherein a polarity of a display voltage corresponding to the display cycle of the second frame and a polarity of a display voltage corresponding to the display cycle of the first frame are opposite to each other; and
producing a target sensing signal according to the mean value of the first sensing signal and the second sensing signal;
wherein the step of reading the signal of the display panel for the first time and the step of reading the signal of the display panel for the second time have at least one row of pixel scan time therebetween.