Pixel circuit and driving method, display panel and display device of pixel circuit

Abstract

A pixel circuit and a method for driving the same, a display panel and a display apparatus are configured to improve the lifespan of the pixel circuit. The pixel circuit comprises: a charging sub-circuit (1), a capacitor (CST), a first driving sub-circuit (2) and a second driving sub-circuit (3); a first terminal of the capacitor (CST) is connected to a first terminal of the first driving sub-circuit (2) and a first terminal of the second driving sub-circuit (3), and a second terminal of the capacitor (CST) is connected to the charging sub-circuit (1); a second terminal of the first driving sub-circuit (2) is connected to a first light emitting device (D1), a second terminal of the second driving sub-circuit (3) is connected to a second light emitting device (D2), wherein a driving current (I1) flowing from the first driving sub-circuit (2) to the first light emitting device (D1) is in an opposite direction to a driving current (I2) flowing from the second driving sub-circuit (3) to the second light emitting device (D2); the charging sub-circuit (1) is configured to charge the capacitor (CST), and when the capacitor (CST) is discharged, the first driving sub-circuit (2) drives the first light emitting device (D1) to emit light or the second driving sub-circuit (3) drives the second light emitting device (D2) to emit light.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, in particular to a pixel circuit and its driving method, a display panel and a display device. Background technique [0002] Organic light-emitting display devices have attracted much attention due to their advantages of low power consumption, high brightness, low cost, wide viewing angle, and fast response speed, and have been widely used in the field of organic light-emitting technology. [0003] An organic light emitting diode (Organic Light Emitting Diode, OLED) is a light-emitting device widely used in the field of organic light-emitting at present. At present, OLEDs can be divided into two categories: passive drive and active drive according to their driving methods, namely direct addressing and thin film transistor (Thin Film Transistor, TFT) matrix addressing. Among them, the actively driven OLED is also called active matrix OLED (AMOLED), and the light-emi...

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Problems solved by technology

[0006] The pixel circuit provided by the prior art only includes a driving transistor and a light-emitting device connected to the driving transistor. In the stage of displaying a frame of images, the driving transistor in the pixel circuit drives the light-emitting device to emit light; AMOLED display driving OLED to emit light belongs to DC drive. , the electric field corresponding to the long-term DC driving voltage causes polarized ions inside the OLED, which makes the OLED form a built-in electric field, thereby increasing the threshold voltage of the OLED, greatly reducing the luminous efficiency of the OLED, and shortening the life of the OLED.

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