Pixel circuit and driving method thereof, electroluminescent display panel and display device

Abstract

The invention discloses a pixel circuit and a driving method thereof, an electroluminescent display panel and a display device. The pixel circuit comprises a first switch module, a second switch module, a light-emitting module and a dual-driving module. On the basis of improvement of the pixel circuit, a first drive end of the dual-driving module is connected with a first node and a second drive end is connected with a second node. When a first grid line signal terminal and a second grid line signal terminal input grid line scanning signal alternately, the first switch module and the second switch module works alternately and thus the first drive end and the second drive end of the dual-driving module works alternately, so that the light-emitting module is driven to emit light. Therefore,because of the alternate work of the two drive ends, a phenomenon of high voltage instability caused by the long-term working state of one drive end of the dual-driving module is avoided, so that thestability of the pixel grayscale brightness is ensured and the poor displaying is eliminated.

Description

technical field [0001] The present invention relates to the technical field of light-emitting, and in particular, to a pixel circuit, a driving method thereof, an electroluminescent display panel and a display device. Background technique [0002] Organic light-emitting diodes (Organic Light Emitting Display, OLED) can be divided into passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED) according to the driving method. Pixels arranged in an array are active display types, and have the advantages of high luminous efficacy, high contrast ratio, and wide viewing angle, and are usually used in high-definition large-size display devices. At present, the commonly used AMOLED pixel circuit is a current-type driving circuit. When a current passes through the organic light-emitting diode, the organic light-emitting diode emits light, and the gray-scale brightness of the pixel can be changed by controlling the current flowing through th...

AI Technical Summary

Problems solved by technology

[0004] However, because the driving thin film transistor T2 in the pixel circuit is under the action of the gate bias for a long time, the threshold voltage of the driving thin film transistor T2 drifts, so that the brightness of the organic light emitting diode D changes significantly, resulting in various display problems. bad

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