Pixel unit, pixel circuit and driving method of pixel circuit

Abstract

The invention relates to the technical field of display, in particular to a pixel unit, a pixel circuit comprising the pixel unit and a driving method of the pixel circuit. The pixel circuit comprises a lighting device and n driving sub-circuits, wherein the n is a natural number and is larger than 1. Each driving sub-circuit comprises a control electrode scan signal line, a switch transistor and a driving transistor. A control electrode of the switch transistor is connected with the control electrode scan signal line, a first electrode is connected with a data line, and a second electrode is connected with a control electrode of the driving transistor. A first electrode of the driving transistor is connected with a power supplying line, and a second electrode is connected with a third electrode of a luminescent device. A fourth electrode of the luminescent device is connected with a reference voltage end. According to the pixel circuit, the design that the n driving sub-circuits used for driving the luminescent device to illuminate is adopted so that the driving sub-circuits can drive the luminescent device to illuminate according to the time sequence stage. Stress time of the driving transistor in each driving sub-circuit can be effectively shortened in this way.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel unit, a pixel circuit including the pixel unit and a driving method thereof. Background technique [0002] Organic Light-Emitting Diode (OLED, Organic Light-Emitting Diode), as a current-mode light-emitting device, has been increasingly used in high-performance active-matrix OLED displays. In a traditional passive matrix organic light emitting diode (Passive Matrix OLED) display, as the display size increases, the driving time of a single pixel needs to be shorter, so it is necessary to increase the transient current and increase the power consumption. At the same time, the application of high current will cause the voltage drop on the nano-indium tin metal oxide line to be too large, and the working voltage of the OLED will be too high, thereby reducing its efficiency. The Active Matrix Organic Light Emitting Diode (AMOLED, Active Matrix OLED) display can solve...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the crystallization process, low-temperature polysilicon thin film transistors fabricated on large-area glass substrates often have non-uniformity in electrical parameters such as threshold voltage and mobility. This non-uniformity will translate into OLED devices. The difference in driving current and brightness is perceived by the human eye as color unevenness

Although the process uniformity of the oxide thin film transistor is good, but similar to the amorphous silicon thin film transistor, its threshold voltage will drift under long-term pressure and high temperature. Different amounts will cause differences in display brightness. Since this difference is related to the previously displayed image, it often appears as an afterimage phenomenon.

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