Pixel circuit, driving method and display device of pixel circuit

Abstract

The embodiment of the invention provides a pixel circuit, a driving method and a display device of the pixel circuit, relates to the field of display technology, can effectively compensate the threshold voltage shift of a thin film transistor (TFT) so as to improve the luminance homogeneity of the display device and improve the display effect. The pixel circuit comprises a first transistor, a second transistor, a memory capacitor and a third transistor for driving a luminescent device, wherein the grid electrode of the first transistor is connected with a scanning line; the first electrode of the first transistor is connected with the grid electrode of the third transistor; the second electrode of the first transistor is connected with a control power line; the grid electrode of the second transistor is connected with the scanning line; the first electrode is connected with a data line; the second electrode is connected with one end of the luminescent device; the first electrode of the third transistor is connected with the control power line; the second electrode is connected with one end of the luminescent device; one end of the memory capacitor is connected with a first power voltage; the other end of the memory capacitor is connected with the grid electrode of the third transistor; and the other end of the luminescent device is connected with a second power voltage. The embodiment is applied to manufacturing 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.

Images