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Pixel circuit, compensation method for pixel circuit and display device

專利號(hào)
US10867554B2
公開日期
2020-12-15
申請(qǐng)人
Hefei Xinsheng Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd.(CN Hefei CN Beijing)
發(fā)明人
Min He; Song Meng; Fei Yang; Chun Cao; Xiaolong Wei
IPC分類
G09G3/3233; G09G3/3266; G09G3/3275
技術(shù)領(lǐng)域
voltage,transistor,signal,reset,scan,emitting,terminal,sensing,tft3,switching
地域: Anhui

摘要

The present disclosure relates to a pixel circuit, a compensation method and a display device. The pixel circuit includes a first switching circuit for supplying a data voltage to a first node in response to a first scan signal being valid, a second switching circuit for conductively connecting a sensing signal line with a second node in response to a second scan signal being valid, a reset circuit for supplying a reset voltage to the sensing signal line in response to a reset control signal being valid, a light-emitting element, and a driving transistor for enabling, when the light-emitting element emits light, the sensing signal line to be charged in response to the second scan signal being valid and the reset control signal being invalid, the voltage of the sensing signal line is sensed after it was charged so as to compensate the data voltage.

說明書

S203: a voltage sensing phase comprises: when the light-emitting element emits light, charging the sensing signal line in response to the first scan signal becoming invalid and by correspondingly controlling the second scan signal and the reset control signal. Optionally, when both the first scan signal and the second scan signal become invalid, the driving transistor is kept ON with a data voltage stored with the tank circuit. In response to the second scan signal becoming valid and the reset control signal being invalid, the sensing signal line (in other words, a parasitic capacitance of the sensing signal line) is charged with a second voltage on the second voltage terminal, and the voltage of the sensing signal line is sensed after it was charged. The sensed voltage corresponds to a voltage on the first terminal of the light-emitting element in a light-emitting state.

S204: a compensation phase comprises: compensating the data voltage supplied to the data line according to the sensed voltage. In some embodiments, a corresponding data voltage variation may be determined according to the sensed voltage, and compensation may be performed for the to-be-written data signal according to the determined data voltage variation to provide a compensated data signal in a corresponding data writing phase. Optionally, the sensed voltage and the degree of aging of the light-emitting element are used together to determine a data voltage variation ΔV. The data voltage variation ΔV is used to adjust the data voltage of the corresponding original data signal. The adjusted data voltage is supplied to the pixel circuit on the data signal terminal in the corresponding data writing phase to achieve compensation.

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