US 12,217,669 B2
Pixel driving circuit, driving method thereof, and display device
Shiqiang Huang, Hubei (CN); Qi Cao, Hubei (CN); Zhengyue Chen, Hubei (CN); and Xing Ming, Hubei (CN)
Assigned to WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD., Hubei (CN)
Appl. No. 16/975,121
Filed by WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD., Hubei (CN)
PCT Filed Jun. 15, 2020, PCT No. PCT/CN2020/096126
§ 371(c)(1), (2) Date Aug. 22, 2020,
PCT Pub. No. WO2021/217808, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 202010356383.1 (CN), filed on Apr. 29, 2020.
Prior Publication US 2023/0123397 A1, Apr. 20, 2023
Int. Cl. G09G 3/3233 (2016.01); G09G 3/3266 (2016.01); G09G 3/3291 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 3/3266 (2013.01); G09G 3/3291 (2013.01); G09G 2300/0819 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A pixel driving method based on a pixel driving circuit, wherein the pixel driving method comprises:
in a reset phase, writing a data voltage to a first node in response to control of a first scan signal by a data writing unit, and pulling down a voltage of a second node by a compensation unit and a light-emitting control unit;
in a compensation phase, charging the voltage of the second node to a first compensation voltage in response to the control of the first scan signal by both the data writing unit and the compensation unit;
wherein V1=Vdata+Vth, V1 represents the first compensation voltage, Vdata represents the data voltage, and Vth represents a threshold voltage of a driving transistor; and
in a light-emitting phase, inputting a first power supply voltage to the first node in response to control of a second scan signal by a first control unit;
wherein a driving unit outputs a driving current to a light-emitting device through the light-emitting control unit in response to control of the voltage of the second node to drive the light-emitting device to emit light; and
wherein the pixel driving circuit comprises:
the data writing unit connected to the data voltage and the first scan signal and configured to write the data voltage to the first node in the reset phase;
the first control unit connected to the first power supply voltage and the second scan signal, coupled to the first node with the driving unit and the data writing unit respectively, and configured to write the first power supply voltage to the first node during the light-emitting phase;
the driving unit connected to the first power supply voltage and configured to provide the driving current;
the compensation unit coupled to the second node with the driving unit, and connected to the first scan signal, wherein the data writing unit and the compensation unit are configured to charge the second node to the first compensation voltage during the compensation phase;
the light-emitting control unit configured to receive a light-emitting signal, coupled to a third node with the driving unit and the compensation unit, and configured to reset the light-emitting device and to control the driving current to transmit to the light-emitting device during the light-emitting phase; and
the light-emitting device, wherein a first electrode of the light-emitting device is connected to the light-emitting control unit, and a second electrode of the light-emitting device is configured to receive a second power supply voltage.