Pixel circuit, driving method thereof, and display device

Abstract

The invention provides a pixel circuit, a driving method thereof, and a display device. The pixel circuit includes: a reset unit, which connects the reset voltage to the gate of the drive transistor, so that the drive transistor is reset; a write unit, which writes the data voltage into the second terminal of the storage capacitor, and writes the reference voltage into the second terminal of the drive transistor. Two poles; the threshold voltage latch unit is connected to the gate of the drive transistor and the first pole of the drive transistor, and the threshold voltage of the drive transistor is latched to the gate of the drive transistor; the drive level latch unit is connected to the first pole of the drive transistor. The second driving level is latched to the second end of the storage capacitor; and the light emission control unit, after latching the threshold voltage to the gate of the driving transistor, connects the second driving level to the second pole of the driving transistor, and controls The driving transistor drives the light-emitting element to emit light, and the gate-source voltage of the driving transistor compensates the threshold voltage of the driving transistor and the second driving level. The invention can improve the effect of compensating the driving level.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and a display device. Background technique [0002] In an existing pixel circuit applied to an AMOLED (Active Matrix / Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode) display device, the drive level VDD and the threshold voltage Vth of the drive transistor are latched synchronously. In the latch stage, the drive transistor adopts diode connection mode, which is equivalent to charging a super large resistor and capacitor through the source of the drive transistor, so charging the capacitor is very slow, and it cannot be fully charged to the predetermined voltage within a certain period of time. Charging to a certain voltage, the ratio of the voltage to the predetermined voltage is the charging rate, so the latched driving level VDD should be multiplied by the charging rate, so that the driving level VDD ca...

AI Technical Summary

Problems solved by technology

[0002] In an existing pixel circuit applied to an AMOLED (Active Matrix / Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode) display device, the drive level VDD and the threshold voltage Vth of the drive transistor are latched synchronously. In the latch stage, the drive transistor adopts diode connection mode, which is equivalent to charging a super large resistor and capacitor through the source of the drive transistor, so charging the capacitor is very slow, and it cannot be fully charged to the predetermined voltage within a certain period of time. Charging to a certain voltage, the ratio of the voltage to the predetermined voltage is the charging rate, so the latched driving level VDD should be multiplied by the charging rate, so that the driving level VDD cannot be fully compensated during the light-emitting phase

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