Pixel circuit, organic electroluminescence display panel and display device

Abstract

The invention discloses a pixel circuit, an organic electroluminescence display panel and a display device. A testing module is additionally arranged in the pixel circuit. In a display time period, a charging module provides driving voltage signals to a driving module through the testing module, and the driving module drives a light-emitting component to emit light under control of the driving voltage signals. In a testing time period, the current signals of the light-emitting component reach the output end of the charging module after passing through the testing module, the charging module outputs the current signals to a data signal end, an external compensation processing unit determines the compensating voltage signals of each pixel circuit according to the current signals received by the data signal end, a driving unit enables the compensating voltage signals to be superimposed with the data signals received from a signal source and then sends the superimposed signals to the data signal end, compensated driving voltage signals are provided for the driving module through the charging module, and finally the current signals driving the light-emitting component to emit light meet a uniformity standard, the brightness of pixels is made to be even, and the quality of a display frame is guaranteed.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to a pixel circuit, an organic electroluminescence display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is one of the hot spots in the field of flat panel display research today. Compared with liquid crystal displays, OLED has the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed. , OLED has begun to gradually replace traditional LCD display screens in display fields such as mobile phones, PDAs, and digital cameras. Unlike LCD, which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current to control light emission. [0003] Existing pixel circuits that drive OLED to emit light, such as figure 1 As shown, it includes: a driving transistor M1, a switching transistor M2, a storage capacitor C, and a light...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a pixel circuit, an organic electroluminescence display panel, and a display device, which are used to solve the problems of poor uniformity of current for driving a light-emitting device OLED and uneven display brightness existing in a display device in the prior art

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