Flexible Display Module Sealant Layout for Junction Stress Release

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Solution Overview

Problem

Existing display modules experience excessive local stress at the junction between film structures like polarizers and protective glues during bending, leading to performance issues and reduced service life due to unreleased stress.

Innovation Solution

A sealant layer is divided into two sections with different elastic moduli, where the second sealant section bonded to the functional layer has a lower modulus than the first, allowing better stress release during bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a layer of protective glue is used to cover the wiring and structures during bending, then the display module is protected from damage, but excessive local stress accumulates at the junction between the film structure and protective glue

Engineering Contradiction:

Improveprotection of wiring and structuresVSAvoidlocal stress at junction

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The sealant layer is divided into two distinct sections: a first sealant section spaced apart from the functional layer and a second sealant section filled between the first sealant section and the functional layer. This segmentation allows each section to have different elastic moduli, with the second sealant section having a smaller elastic modulus to better accommodate stress at the critical junction area with the film structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the sealant layer are assigned different elastic moduli based on their functional requirements. The second sealant section adjacent to the film structure has a smaller elastic modulus to provide flexibility and stress relief at the junction, while the first sealant section can have a larger elastic modulus for structural support. This local differentiation of material properties optimizes both protection and stress management.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the sealant layer is made with uniform elastic modulus, then manufacturing is simplified, but stress cannot be effectively released during bending

Engineering Contradiction:

Improveuniform sealant layerVSAvoidstress release capability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The sealant layer transitions from a uniform structure to a non-uniform structure with spatially varying elastic moduli. The first sealant section has a larger elastic modulus for rigidity, while the second sealant section has a smaller elastic modulus for flexibility and stress accommodation at the film structure junction. This local quality differentiation maintains manufacturing feasibility while significantly improving stress release capability during bending operations.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12512020B2Display module, manufacturing method thereof, and display device

Publication Date: 2025.12.30 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

Embodiments of the application discloses a display module, a manufacturing method thereof, and a display device, wherein the display module includes a display panel, a functional layer, and a sealant layer disposed on the display panel, the sealant layer includes a first sealant section spaced apart from the functional layer and a second sealant section filled between the first sealant section and the functional layer, and an elastic modulus of the second sealant section is smaller than an elastic modulus of the first sealant section.