Film transistor, array substrate, display panel and display device

Abstract

The invention relates to the technical field of display and discloses a film transistor, an array substrate, a display panel and a display device. The film transistor comprises a substrate, and an active layer and a source-drain electrode layer which are sequentially arranged on the substrate, wherein the active layer comprises a first part, a second part and a third part, the first part and the second part are connected with a source electrode and a drain electrode in the source-drain electrode layer respectively, the third part is connected between the first part and the second part, and thefirst part and the second part have a height difference in the direction perpendicular to the substrate; specifically, when the flexible display panel is bent, the bending radius direction is perpendicular to a surface of the substrate. The film transistor is advantaged in that the third part (a channel region) of the active layer extends in the extending direction approximately perpendicular tothe substrate, the mechanical stress borne by the substrate in the bending process is very small, deformation is not likely to happen, problems of TFT threshold voltage drifting, device failure and the like are not likely to be caused, and thereby performance of the flexible display panel can be improved, and the service life of the flexible display panel can be prolonged.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a thin film transistor, an array substrate, a display panel and a display device. Background technique [0002] The general manufacturing method of flexible organic electroluminescent (OLED) displays is: prepare a flexible substrate on a carrier substrate, and then prepare a buffer layer, a thin-film transistor (TFT) and an organic light-emitting diode on the flexible substrate; after the flexible display substrate is prepared, use a laser Peel it off from the carrier substrate. Specifically, flexible OLED display products are often bent during use, and the TFT will continue to be subjected to mechanical stress during the bending process. As the number of bending times increases, it is easy to cause the threshold voltage (Vth) of the TFT to drift and the device to fail. , so that the flexible display displays abnormally, or even fails to work normally. Contents of the inventi...

AI Technical Summary

Problems solved by technology

Specifically, flexible OLED display products are often bent during use, and the TFT will continue to be subjected to mechanical stress during the bending process. As the number of bending times increases, it is easy to cause the threshold voltage (Vth) of the TFT to drift and the device to fail. , causing the flexible display to display abnormally or even fail to work

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