Flexible screen folding cover plate, preparation method thereof, and flexible display module

Abstract

The invention provides a flexible screen folding cover, its preparation method and a flexible display module, which solves the problem of poor bending performance of the folding cover in the existing flexible screen. The flexible screen folding cover includes: a flexible substrate; and a covering layer formed on the surface of the flexible substrate; wherein, the covering layer includes at least one negative Poisson's ratio material layer. By setting a covering layer including at least one layer of negative Poisson's ratio material layer on the surface of the flexible substrate, since the covering layer of the surface layer has a negative Poisson's ratio characteristic, the stress concentration when the cover plate is stressed is slowed down, and the surface of the cover plate is reduced. There is no risk of cracks or even breakage, which in turn improves the bending performance of the flexible screen folding cover.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a flexible screen folding cover, a preparation method thereof, and a flexible display module. Background technique [0002] As an important part of the bendable flexible screen, the folding cover of the flexible screen is arranged at the outermost end of the flexible screen. With the continuous development of display technology, flexible screens with good bending performance are more and more popular in the market, and higher requirements are put forward for the bending performance of the flexible screen folding cover. The existing flexible screen folding covers are mostly made of colorless transparent polyimide (Colorless Polyimide, CPI) with hard coating or ultra-thin glass (Ultra Thin Glass, UTG). The performance is not optimistic, and there is a problem of poor bending performance. Therefore, abnormalities such as cracks, surface scratches, and internal disconnections occur...

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Problems solved by technology

[0003] In view of this, the embodiments of the present invention are dedicated to providing a flexible screen folding cover and its preparation method. In addition, the present invention also provides a flexible display module using the flexible screen folding cover to solve the problem of existing flexibility The problem of poor bending performance of the screen folding cover

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