A pixel circuit, its driving method, and a display device

Abstract

The invention provides a pixel circuit and a driving method thereof and a display device thereof, and relates to display technical field. The pixel circuit can effectively compensate threshold value voltage drift of thin film transistor (TFT), improve uniformity of luminance brightness of the display device, and improve display effect. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a storage capacitance and a luminescent device. The pixel circuit and the driving method thereof and the display device thereof are used for manufacture of display panels.

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), as a current-mode light-emitting device, is increasingly being used because of its characteristics such as self-luminescence, fast response, wide viewing angle and the ability to be fabricated on flexible substrates. In the field of high-performance display. According to the driving method, OLED can be divided into two types: PMOLED (Passive Matrix Driving OLED, passive matrix driving organic light emitting diode) and AMOLED (Active Matrix Driving OLED, active matrix driving organic light emitting diode). As the size of the traditional PMOLED increases, the driving time of a single pixel usually needs to be reduced, so the transient current needs to be increased, resulting in a significant increase in power consumption. In the AMOLED techn...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the crystallization process and manufacturing level, the TFT switch circuits fabricated on large-area glass substrates often have non-uniformity in electrical parameters such as threshold voltage and mobility, which makes the threshold voltage shift of each TFT inconsistent. , which will lead to current differences and brightness differences of OLED display devices, which will be perceived by human eyes; in addition, the threshold voltage of TFT will also drift under long-term pressure and high temperature. The amount of threshold shift for different images is different, resulting in a difference in display brightness. Since this difference is related to the previously displayed image, it often appears as an afterimage phenomenon.

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