US 11,990,094 B1
Pixel driving circuit and driving method therefor, and display panel
Tao Fan, Shenzhen (CN); Zhenghui Yuan, Shenzhen (CN); Yun Wang, Shenzhen (CN); Guanqun Li, Shenzhen (CN); and Baohong Kang, Shenzhen (CN)
Assigned to HKC CORPORATION LIMITED, Shenzhen (CN)
Filed by HKC CORPORATION LIMITED, Shenzhen (CN)
Filed on Jun. 12, 2023, as Appl. No. 18/333,050.
Claims priority of application No. 202211470343.5 (CN), filed on Nov. 23, 2022.
Int. Cl. G09G 3/3233 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 2300/0852 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0223 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/0257 (2013.01); G09G 2320/045 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A driving method for a pixel driving circuit, wherein the driving method for a pixel driving circuit is used for the pixel driving circuit comprising an organic light-emitting diode, wherein the pixel driving circuit further comprises:
a first switching transistor, having a control end connected to a first control line, a first end connected to a reference power line, and a second end connected to a first node;
a second switching transistor, having a control end configured to be connected to a scan line, a first end configured to be connected to a data line, and a second end connected to the first node;
a driving transistor, having a control end connected to the first node, a first end connected to a driving power line, and a second end connected to a second node;
a first capacitor, connected to the first node and a third node;
a second capacitor, connected to the third node and a cathode of the organic light-emitting diode;
a third switching transistor, having a first end and a second end connected to the third node and the second node in a one-to-one correspondence manner, and a control end connected to a second control line; and
a fourth switching transistor, having a first end and a second end connected to the second node and an anode of the organic light-emitting diode in a one-to-one correspondence manner, and a control end connected to a third control line,
wherein the driving power line is connected to an alternating current power supply and the driving power line is the second control line;
wherein the driving method for a pixel driving circuit comprises:
in a sampling stage, controlling the first switching transistor and the third switching transistor to be turned on, and controlling the second switching transistor and the fourth switching transistor to be turned off, to charge the first capacitor and the second capacitor;
in a data writing stage, controlling the second switching transistor to be turned on, and controlling the first switching transistor, the third switching transistor, and the fourth switching transistor to be turned off, allowing a signal from the data line to be written into the first capacitor and the second capacitor through the second switching transistor; and
in a light emitting stage, controlling the third switching transistor and the fourth switching transistor to be turned on, and controlling the first switching transistor and the second switching transistor to be turned off, allowing a driving current to flow through the organic light-emitting diode to make the organic light-emitting diode emit light.