Flexible OLED display panel and preparation method thereof

Abstract

The embodiment of the invention provides a flexible OLED display panel and a preparation method thereof. According to the flexible OLED display panel provided by the embodiment of the invention, the barrier layer is arranged between the flexible substrate and the TFT layer, and the content of the hydrogen element in the barrier layer in the direction from the flexible substrate to the TFT layer is gradually reduced, so that the content of the hydrogen element, close to one side of the flexible substrate, in the barrier layer is relatively high; therefore, erosion of water and oxygen from one side of the flexible substrate can be effectively blocked, the problems of display image degradation and OLED device aging caused by external water and oxygen invasion are avoided, in addition, the hydrogen element content of one side, close to the TFT layer, in the blocking layer is low or the blocking layer does not contain hydrogen, diffusion of the hydrogen element to the TFT layer can be effectively slowed down or prevented, and the OLED device display quality is improved. The influence of hydrogen diffusion in the barrier layer on the electrical property of the TFT is eliminated or reduced, the stability of the image quality of the flexible OLED display panel is improved, and the service life of the flexible OLED display panel is prolonged.

Description

technical field [0001] The present application relates to the display field, in particular to a flexible OLED display panel and a preparation method thereof. Background technique [0002] Organic Light-Emitting Diodes (OLED for short) is a self-luminous device, which has the advantages of light weight, low power consumption, fast response speed, high luminous efficiency and flexible display, and has become a widely used device in recent years. One of the display devices. Among them, the flexible OLED display panel has become the mainstream product in the display field. [0003] The substrate of the flexible OLED display panel is usually a flexible polymer material (such as PI, etc.), and its ability to block water and oxygen is obviously insufficient compared with the glass substrate, which leads to unstable display of the flexible OLED display panel and accelerates the aging of the OLED device. . An existing solution is to prepare an inorganic water-oxygen barrier layer....

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Problems solved by technology

[0003] The substrate of the flexible OLED display panel is usually a flexible polymer material (such as PI, etc.), and its ability to block water and oxygen is obviously insufficient compared with the glass substrate, which leads to unstable display of the flexible OLED display panel and accelerates the aging of the OLED device.

An existing solution is to prepare an inorganic water-oxygen barrier layer. During the preparation process, gas containing H is introduced to further increase the density of the barrier layer, but the problem that follows is that a large amount of H will partially diffuse into the active layer. Change the TFT threshold voltage, causing image quality degradation

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