Package thin film, flexible display device and flexible terminal

Abstract

The invention relates to the technical field of display and discloses a package thin film, a flexible display device and a flexible terminal. The package thin film is used for the flexible display device and comprises at least one layer of inorganic film layer and at least one layer of organic film layer, which are superposed alternately, wherein the organic film layer comprises a first organic film layer for covering a bending area and a second organic film layer corresponding to a non-bending area and connected with the first organic film layer, Young's modulus of the first organic film layer being smaller than that of the second organic film layer. According to the package thin film, the organic film layers corresponding to the bending area and the non-bending area of the flexible display device are different in performance; the first organic film layer corresponding to the bending area has smaller Young's modulus and has larger elongation at break; and when the flexible display device bends repeatedly, stress during bending can be released properly, thereby enabling the package thin film not to be damaged easily, improving overall bending performance of the flexible display device and facilitating prolonging the service life of the flexible display device.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a packaging film, a flexible display device and a flexible terminal. Background technique [0002] OLED (Organic Electroluminescent) devices are considered to be the most promising flat-panel display devices in the contemporary era, and at the same time considered to be the display technology most likely to produce flexible display devices. However, the lifespan of the OLED device restricts its industrial development. When the OLED device is working, electrons are injected from the cathode to the transport layer. Materials to reduce the energy level barrier, and such low work function metals, such as magnesium, aluminum, and silver, are active materials, which can easily react with water and oxygen in the environment, causing the device to fail. At the same time, the hole transport layer (HTL) and the electron transport layer (ETL) are easily corroded by water and oxygen, resul...

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Problems solved by technology

[0003] At present, the reliability of OLED encapsulation mainly depends on Thin Film Encapsulation (TFE). The structure of TFE is an organic / inorganic multilayer stack structure, in which the inorganic layer realizes the function of blocking water and oxygen, and the organic layer realizes the planarization effect. However, for flexible OLEDs, the display screen is repeatedly bent. Due to the large stress of the inorganic film layer and the large Young's modulus, repeated bending will cause damage to the packaging structure and even the entire display terminal. Therefore, there is an urgent need for a flexible OLED display device. package structure

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