Pixel circuit and drive method thereof, and display device

Abstract

The present invention provides a pixel circuit and a drive method thereof, and a display device, and relates to the technical field of display. The objective of the invention is to improve the problemthat display frame brightness is not uniform caused by threshold voltage drift and voltage drop on a power line. The pixel circuit comprises: a data write-in sub circuit connected with a first signalend, a first voltage end and a first point and configured to transmit signals of the first voltage end to the first point; a compensation sub circuit connected with a second signal end and a drive sub circuit and configured to perform compensation of a threshold voltage for the drive sub circuit; a luminescence control sub circuit connected with an enable signal end, a drive sub circuit and a luminescence sub circuit and configured to connect the drive sub circuit with the luminescence sub circuit; the drive sub circuit connected with the first point, a second voltage end and the luminescencecontrol sub circuit and configured to drive the luminescence sub circuit for luminescence under the control of the first point and the luminescence control sub circuit after the compensation of the threshold voltage is obtained; and the luminescence sub circuit connected with a third voltage end and used for luminescence.

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] Organic Light Emitting Diode (OLED) display is one of the hotspots in the current research field. Compared with Liquid Crystal Display (LCD), OLED has low energy consumption, low production cost, self-illumination, and wide viewing angle. And corresponding advantages such as fast speed. Among them, pixel circuit design is the core technical content of OLED display, which has important research significance. [0003] The OLED drive circuit in the prior art such as figure 1 As shown, since the driving transistor Td and OLED are connected in series, the driving current I of the driving transistor Td oled The value of can determine the brightness produced by the OLED device. Drive current I oled That is, the current flowing through the driving transistor Td can be expressed as...

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