US 12,175,902 B1
Detection method for display panel and detection device for display panel
Fan Tian, Guangdong (CN)
Assigned to SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Guangdong (CN)
Filed on Dec. 1, 2023, as Appl. No. 18/527,218.
Claims priority of application No. 202311019848.4 (CN), filed on Aug. 11, 2023.
Int. Cl. G09G 3/00 (2006.01); G09G 3/20 (2006.01); G09G 3/3233 (2016.01)
CPC G09G 3/006 (2013.01) [G09G 3/2096 (2013.01); G09G 3/3233 (2013.01); G09G 2300/0819 (2013.01); G09G 2300/0842 (2013.01); G09G 2330/12 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A detection method for a display panel, for detecting the display panel, wherein the display panel comprises a plurality of light-emitting devices and a plurality of pixel-driving circuits connected to the light-emitting devices, each of pixel-driving circuits comprises a driving transistor, a source of each driving transistor is electrically connected to a first voltage terminal through the corresponding light-emitting device, a drain of each driving transistor is electrically connected to a second voltage terminal, and the display panel detection method comprises following steps:
performing a detection operation on the pixel-driving circuits by applying a gate voltage and a source voltage to a gate and the source of each driving transistor, to turn on the driving transistor, and sampling voltages at the sources as sampled voltages;
repeating the detection operation n times, wherein in each repetition of the detection operation, the gate voltage is a sum of the gate voltage in the initial detection operation, and an accumulative addition of a difference between the gate voltage and the sampled voltage in the previous detection operation, where n is a positive integer; and
determining whether a threshold voltage of the driving transistor in each pixel-driving circuit is abnormal, based on the sampled voltage of the driving transistor of each of the pixel-driving circuits from the n-th repeated detection operation.