Pixel circuit and driving method thereof, and active-matrix organic light emission display device

Abstract

The invention discloses a pixel circuit and a driving method thereof, and an active-matrix organic light emission display device. The pixel circuit comprises first to six thin film transistors, a capacitor and an organic light-emitting diode. The grid electrode of the first thin film transistor is electrically connected to a light-emitting control line, the first terminal of the first thin film transistor is electrically connected to a first power supply, and a second terminal of the first thin film transistor is electrically connected to a first node; the grid electrode of the second thin film transistor is electrically connected to the light-emitting control line, the first terminal of the second thin film transistor is electrically connected to a second node, and a second terminal of the second thin film transistor is electrically connected to a third node; the grid electrode of the third thin film transistor is electrically connected to the third node; the grid electrode of the fourth thin film transistor is electrically connected to a first scan line, the grid electrode of the fifth thin film transistor is electrically connected to a second scan line, the grid electrode of the sixth thin film transistor is electrically connected to the second scan line, and the capacitor is electrically connected between the first node and the second node. By employing the pixel circuit and the driving method thereof, and the active-matrix organic light emission display device, images with uniform brightness can be displayed.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and an active matrix organic light-emitting display device. Background technique [0002] Flat panel display has the characteristics of complete planarization, lightness, thinness, and power saving. It is an inevitable trend and research focus of image display development. Among various types of flat panel display devices, since an active-matrix organic light-emitting display (AMOLED) uses self-luminous organic light-emitting diodes (Organic Light-Emitting Diode, OLED) to display images, With the characteristics of short response time, driving with low power consumption, and relatively better brightness and color purity, organic light-emitting display devices have become the focus of next-generation display devices. [0003] For a large-scale active matrix organic light emitting display device, it includes a plurality of pixel units lo...

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Problems solved by technology

[0006] although figure 1 The existing active matrix light-emitting display device has the advantage of low power consumption, but due to the manufacturing process of thin-film transistors, it is difficult to make all the thin-film transistors in the active-matrix organic light-emitting display device have the same threshold voltage, that is, the thin film The voltage between the gate and source of the transistor T2, which causes a threshold voltage deviation between different pixel units, which causes the current intensity flowing through the organic light-emitting diode OLED to change over time, resulting in uneven display brightness.

In addition, the leakage current of the thin film transistor T1 is large, which causes the gate voltage of the thin film transistor T2 to change, thereby causing the current flowing through the organic light emitting diode OLED to change, causing the organic light emitting diode OLED to emit light and flicker, causing the active matrix organic light emitting display Device shows deterioration in image quality

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