Adhesive film and preparation method thereof and flexible display module

Abstract

The embodiment of the invention provides an adhesive film and a preparation method thereof and a flexible display module and relates to the technical field of adhesives. By providing the adhesive film with gradually varied elasticity modulus, when the adhesive film is applied to the flexible display module, the module has enough bending strain under a proper stress. The double-sided adhesive film is distributed in a manner that the elastic modulus of the double-sided adhesive film is small in the middle but great in two sides along the thickness direction of the double-sided adhesive film.

Description

technical field [0001] The invention relates to the field of adhesive technology, in particular to an adhesive film, a preparation method thereof, and a flexible display module. Background technique [0002] Bonding different structural layers through adhesive films has certain applications in various industries. Take Optically Clear Adhesive (OCA) in the field of display technology as an example. Specifically, it is generally required in flexible display modules. Optical glue is used to bond each film layer structure to realize the bonding assembly of the entire display module. [0003] However, since the adjacent film layers are bonded by optical glue, and the flexible display module is in the process of bending, a certain relative displacement (strain) will occur between the film layers; in this case Under the circumstances, if the elastic modulus of the optical adhesive is too large, it is difficult for the relative displacement between the film layers to occur, and the...

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Problems solved by technology

[0003] However, since the adjacent film layers are bonded by optical glue, and the flexible display module is in the process of bending, a certain relative displacement (strain) will occur between the film layers; in this case Under the circumstances, if the elastic modulus of the optical adhesive is too large, it is difficult for the relative displacement between the film layers to occur, and the stress required under the same bending strain is relatively large, that is, the overall bending of the flexible display module requires The force is too strong to be suitable for the flexible product structure and mechanical mechanism design, and in the case of high stress, it is easy to cause the optical adhesive film layer to fall off and the function of other functional film layers to be damaged

If the elastic modulus of the optical adhesive is too small, the adhesive force of the optical adhesive is relatively small, and it is not easy to meet the requirements, and the difference between the elastic modulus of the optical adhesive and the adjacent interface is large, and the bending strain Among them, the stress is mainly concentrated on the interface, and the deformation mainly occurs on the interface, which will reduce the reliability of the flexible display module.

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