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Double-sided adhesive film for flexible display panel, preparation method, and flexible display panel

A flexible display and double-sided adhesive technology, which is applied in semiconductor/solid-state device manufacturing, semiconductor devices, electrical components, etc., can solve the problems of double-sided adhesive film stress and strain hysteresis, accumulation of plastic deformation, and poor reliability, and achieve Good stress-strain isolation function, moderate stress-strain hysteresis effect, and stress-reducing effect

Active Publication Date: 2021-04-20
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of flexible folding display technology, flexible folding display products, especially display products with small curvature radius, have the problem of poor reliability in the bending area, that is, in flexible display products, when used to paste adjacent film layers or In the case of structural asymmetry and rigidity asymmetry on both sides of the double-sided adhesive film of the film layer structure, the overall film layer pasted by the double-sided adhesive film inevitably has the problem of multiple bending stress concentration, which in turn causes the double-sided adhesive film The accumulation of plastic deformation of the film layer pasted by the adhesive film leads to the stress-strain hysteresis effect of the double-sided adhesive film, which in turn causes the overall stiffness of the film layer pasted by the double-sided adhesive film to be weak and then structural failure occurs, such as Figure 1A and Figure 1B shown

Method used

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  • Double-sided adhesive film for flexible display panel, preparation method, and flexible display panel
  • Double-sided adhesive film for flexible display panel, preparation method, and flexible display panel
  • Double-sided adhesive film for flexible display panel, preparation method, and flexible display panel

Examples

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Effect test

Embodiment 1

[0037] This embodiment provides a double-sided adhesive film for a flexible display panel, including a viscoelastic deformation zone and a non-deformation zone, the deformability and deformation recovery ability of the deformation zone are better than that of the non-deformation zone, so that the deformation zone can absorb stress The ability to absorb stress is stronger than that of the non-deformed region.

[0038] The double-sided adhesive film is divided into a deformation zone and a non-deformation zone with different viscoelasticity. The deformation zone can well absorb the stress of the entire film layer pasted by the double-sided adhesive film when it is deformed, which greatly eases the double-sided adhesive. The degree of stress concentration after multiple deformations of the film layer pasted by the film greatly eases the accumulation of plastic deformation of the film layer pasted by the double-sided adhesive film, thereby greatly relieving the stress-strain hyster...

Embodiment 2

[0040] This embodiment provides a double-sided adhesive film for a flexible display panel, including a viscoelastic deformation zone and a non-deformation zone, the deformability and deformation recovery ability of the deformation zone are better than that of the non-deformation zone, so that the deformation zone can absorb stress The ability to absorb stress is stronger than that of the non-deformed region.

[0041] Wherein, the viscoelastic relaxation time of the deformation zone is less than or equal to 1 ms. The Young's modulus of the deformation zone is less than 5MPa. Preferably, the Young's modulus of the deformation zone is 1-5 MPa. The smaller the viscoelastic relaxation time, the faster the viscoelastic recovery speed of the deformed zone under stress, and the better the viscoelastic recovery performance. Young's modulus is a physical quantity describing the resistance to deformation of the deformation zone, and it is a characterization of the difficulty of elastic...

Embodiment 3

[0054] This embodiment provides a flexible display panel, such as Figure 5 and Figure 6 As shown, the double-sided adhesive film 10 in any one of embodiments 1-2 is included.

[0055] The flexible display panel also includes a back film 3 , a base film 4 , an OLED light-emitting unit film 5 , an encapsulation film 6 , a touch film 7 , a polarizing film 8 and a protective film 9 arranged in sequence along the first direction P. A double-sided adhesive film 10 is disposed between the packaging film 6 and the touch film 7 . A double-sided adhesive film 10 is arranged between the polarizing film 8 and the protective film 9; a double-sided adhesive film 10 is arranged between the base film 4 and the back film 3; a double-sided adhesive film 10 is arranged between the packaging film 6 and the touch film 7 And the double-sided adhesive film 10 between the polarizing film 8 and the protective film 9 is an OCA optical adhesive film; the double-sided adhesive film 10 between the bas...

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Abstract

The invention provides a double-sided adhesive film for a flexible display panel, a preparation method, and a flexible display panel. The double-sided adhesive film includes a viscoelastic deformation zone and a non-deformation zone, and the viscoelasticity of the deformation zone is better than that of the non-deformation zone, so that the stress-absorbing ability of the deformation zone is stronger than that of the non-deformation zone. The deformation zone of the double-sided adhesive film can well absorb the stress of the entire film layer pasted by the double-sided adhesive film during deformation, which greatly eases the stress concentration degree of the entire film layer pasted by the double-sided adhesive film after multiple deformations , and then greatly eased the plastic deformation accumulation of the whole film layer pasted by the double-sided adhesive film, thereby greatly relieving the stress-strain hysteresis effect of the double-sided adhesive film, and then making the whole film layer pasted by the double-sided adhesive film Structural failure rarely occurs; the viscoelastic partition design makes the double-sided adhesive film have a good stress-strain isolation function, thereby ensuring the overall stress-strain protection of the film layer pasted by the double-sided adhesive film.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a double-sided adhesive film for a flexible display panel, a preparation method, and a flexible display panel. Background technique [0002] With the development of flexible folding display technology, flexible folding display products, especially display products with small curvature radius, have the problem of poor reliability in the bending area, that is, in flexible display products, when used to paste adjacent film layers or In the case of structural asymmetry and rigidity asymmetry on both sides of the double-sided adhesive film of the film structure, the overall film layer pasted by the double-sided adhesive film inevitably has the problem of multiple bending stress concentrations, which in turn causes the double-sided adhesive film The accumulation of plastic deformation of the film layer pasted by the adhesive film leads to the stress-strain hysteresis effect of the dou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/52H01L51/56
CPCH10K50/844H10K71/00
Inventor 朱小研肖维康黄华
Owner BOE TECH GRP CO LTD