US 12,217,719 B2
Pixel driving circuit and display device
Yan Li, Shenzhen (CN)
Assigned to TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Shenzhen (CN)
Appl. No. 17/272,244
Filed by TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Shenzhen (CN)
PCT Filed Dec. 31, 2020, PCT No. PCT/CN2020/142180
§ 371(c)(1), (2) Date Sep. 25, 2023,
PCT Pub. No. WO2022/141409, PCT Pub. Date Jul. 7, 2022.
Prior Publication US 2024/0038195 A1, Feb. 1, 2024
Int. Cl. G09G 3/36 (2006.01); G09G 3/34 (2006.01)
CPC G09G 3/3688 (2013.01) [G09G 3/3413 (2013.01); G09G 3/3677 (2013.01); G09G 2320/0626 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pixel driving circuit, comprising:
a scanning signal line;
at least two data signal lines arranged with the scanning signal line in an interleaved manner;
a light emitting diode, having a first end electrically coupled to a voltage source; and
a pixel driving circuit unit, comprising at least two cascaded units, each cascaded unit having a first electrode electrically coupled to a corresponding data signal line, and a second electrode electrically coupled to a second end of the light emitting diode; wherein the pixel driving circuit unit is configured to change a connection number of the cascaded units being connected to the data signal lines and the light emitting diode, such that a brightness of the light emitting diode is adjusted accordingly; wherein:
each cascaded unit comprises a switching thin film transistor and a driving thin film transistor;
a source of the switching thin film transistor is electrically coupled to the corresponding data signal line;
a gate of the switching thin film transistor is electrically coupled to the corresponding scanning signal line;
a drain of the switching thin film transistor is electrically coupled to a gate of the corresponding driving thin film transistor; and
the switching thin film transistor and the driving thin film transistor comprise at least one of N-type thin film transistors or P-type thin film transistors;
wherein the at least two cascaded units share the scanning signal line, and
the scanning signal line is connected to the gate of the switching thin film transistor in each cascaded unit; and
the at least two cascaded units share a capacitor having one end grounded and another end connected to the drain of the switching thin film transistor and the gate of the driving thin film transistor in each cascaded unit.