US 11,056,056 B2
Pixel unit circuit, method of driving the same, pixel circuit and display device
Minghua Xuan, Beijing (CN); Xiaochuan Chen, Beijing (CN); and Shengji Yang, Beijing (CN)
Assigned to BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Appl. No. 16/622,719
Filed by BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
PCT Filed Aug. 2, 2018, PCT No. PCT/CN2018/098256
§ 371(c)(1), (2) Date Dec. 13, 2019,
PCT Pub. No. WO2019/024887, PCT Pub. Date Feb. 7, 2019.
Claims priority of application No. 201710655886.7 (CN), filed on Aug. 3, 2017.
Prior Publication US 2020/0105196 A1, Apr. 2, 2020
Int. Cl. G09G 3/3241 (2016.01); G09G 3/3291 (2016.01)
CPC G09G 3/3241 (2013.01) [G09G 3/3291 (2013.01); G09G 2300/0842 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method of driving a pixel unit circuit, wherein the pixel unit circuit comprises:
a light-emitting component, a driving transistor, a data writing circuit and a storage capacitor circuit, wherein
a drain electrode of the driving transistor is coupled to a high-level input terminal, a source electrode of the driving transistor is coupled to a first end of the light-emitting component, the driving transistor is an n-type transistor;
the data writing circuit is coupled to a data line, at least one gate line and a gate electrode of the driving transistor, and configured to, under a control of the at least one gate line, enable a connection between the data line and the gate electrode of the driving transistor to be turned on or off;
a first end of the storage capacitor circuit is coupled to the gate electrode of the driving transistor, and a second end of the storage capacitor circuit is coupled to a reference voltage input terminal;
a second end of the light-emitting component is coupled to a low-level input terminal;
a source electrode voltage of the driving transistor varies with a gate electrode potential of the driving transistor;
in a light-emitting phase, under a control of the at least one gate line, enabling by the data writing circuit a connection between the data line and the gate electrode of the driving transistor to be turned on, to enable the driving transistor to work in a constant-current region to drive the light-emitting component to emit light, wherein a source electrode voltage of the driving transistor varies with a gate electrode potential of the driving transistor;
wherein each display period further comprises a resetting phase, the method further comprises:
in the resetting phase, under the control of the at least one gate line, enabling by the data writing circuit the connection between the data line and the gate electrode of the driving transistor to be turned off; under a control of a reset terminal, enabling by a reset circuit a connection between the gate electrode of the driving transistor and the reference voltage input terminal to be turned on;
in the light-emitting phase, under the control of the reset terminal, enabling by the reset circuit the connection between the gate electrode of the driving transistor and the reference voltage input terminal to be turned off;
wherein the at least one gate line comprises a first gate line and a second gate line, and the data writing circuit comprises:
a first data writing transistor, wherein a gate electrode of the first data writing transistor is coupled to the first gate line;
a second data writing transistor, wherein a gate electrode of the second data writing transistor is coupled to the second gate line;
the first data writing transistor is an n-type transistor, and the second data writing transistor is a p-type transistor; and
when an absolute value of a threshold voltage of the first data writing transistor is equal to an absolute value of a threshold voltage of the second data writing transistor, the enabling by the data writing circuit the connection between the data line and the gate electrode of the driving transistor to be turned off in the resetting phase under the control of the at least one gate line, further comprises:
outputting a first gate driving signal by the first gate line, and outputting a second gate driving signal by the second gate line, wherein a potential of the first gate driving signal is a low voltage and a potential of the second gate driving signal is a high voltage, to enable the first data writing transistor and the second data writing transistor to be turned off, and to enable the connection between the data line and the gate electrode of the driving transistor to be turned off;
the enabling by the data writing circuit the connection between the data line and the gate electrode of the driving transistor to be turned on in the light-emitting phase under the control of the at least one gate line, comprises:
outputting the first gate driving signal by the first gate line, and outputting the second gate driving signal by the second gate line, wherein the potential of the first gate driving signal is the high voltage and the potential of the second gate driving signal is the low voltage, to enable the first data writing transistor to be turned on and enable the second data writing transistor to be turned on;
the method further comprises: after the light-emitting phase ends in each display period, outputting the first gate driving signal by the first gate line, and outputting the second gate driving signal by the second gate line, wherein the potential of the first gate driving signal is the low voltage and the potential of the second gate driving signal is the high voltage, to enable the first data writing transistor and the second data writing transistor to be turned off, and to enable the connection between the data line and the gate electrode of the driving transistor to be turned off.