Flexible Display Optical Adhesive Local Curing Strategy

Solution Overview

Problem

Current optical adhesives used in flexible display modules suffer from poor bending performance when cured and poor adhesion when uncured, making it challenging to achieve both structural strength and adhesion stability in flexible display devices.

Innovation Solution

A flexible display module and device design that incorporates a first optical adhesive layer with uncured optical adhesive in bending regions and cured optical adhesive in non-bending regions, utilizing poly(methyl methacrylate) and epoxy acrylate respectively, to enhance both bending and adhesion performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If cured optical adhesive is used, then adhesion and fluidity are improved, but bending resistance deteriorates

Engineering Contradiction:

ImproveadhesionVSAvoidbending resistance

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent applies different adhesive states to different regions: cured optical adhesive is used in non-bending regions (such as four corners and middle areas) where strong adhesion is needed, while uncured optical adhesive is used in bending regions where flexibility is required. This local differentiation resolves the contradiction by matching adhesive properties to functional requirements of each region.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The optical adhesive layer is segmented into multiple regions with different curing states. The non-bending regions contain cured adhesive for structural strength, while bending regions contain uncured adhesive for flexibility. This segmentation allows the single adhesive layer to simultaneously provide both adhesion and bending resistance in different locations.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If uncured optical adhesive is used, then bending resistance is improved, but adhesion deteriorates

Engineering Contradiction:

Improvebending resistanceVSAvoidadhesion

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent applies different adhesive states to different regions: cured optical adhesive is used in non-bending regions (such as four corners and middle areas) where strong adhesion is needed, while uncured optical adhesive is used in bending regions where flexibility is required. This local differentiation resolves the contradiction by matching adhesive properties to functional requirements of each region.

Inventive Principle:

Principle #3Local quality

3Strength

If optical adhesive is used to attach polarizer, then adhesion is improved, but bending performance deteriorates after curing

Engineering Contradiction:

ImproveadhesionVSAvoidbending performance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies different adhesive states to different regions: cured optical adhesive is used in non-bending regions (such as four corners and middle areas) where strong adhesion is needed, while uncured optical adhesive is used in bending regions where flexibility is required. This local differentiation resolves the contradiction by matching adhesive properties to functional requirements of each region.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The optical adhesive layer is segmented into multiple regions with different curing states. The non-bending regions contain cured adhesive for structural strength, while bending regions contain uncured adhesive for flexibility. This segmentation allows the single adhesive layer to simultaneously provide both adhesion and bending resistance in different locations.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design achieves high bending strength in bending regions and adhesion stability across the entire surface, addressing the limitations of prior art by combining the benefits of uncured and cured adhesives in specific areas.

Implementation Method 1

optical adhesives are used to attach polarizers to other materials

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

the other is a cured type, which has good adhesion and fluidity, but the bending resistance is reduced after being cured by ultraviolet light

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS20210046746A1Flexible display module and flexible display device

Publication Date: 2021.02.18 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The present application provides a flexible display module including a touch panel and a polarizer. The polarizer is disposed on the touch panel and connected to the touch panel by a first optical adhesive layer. The first optical adhesive layer includes an uncured optical adhesive in a bending region and a cured optical adhesive in a non-bending region.