Multi-Layer Cover Window Assembly for Flexible Displays
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Solution Overview
Problem
Conventional cover windows for flexible display devices lack sufficient impact resistance and flexibility, failing to protect against scratches, fingerprints, and damage from impacts, especially when the displays need to be foldable and maintain optical clarity.
Innovation Solution
A multi-layer cover window assembly comprising energy-dispersing, elastomer, structural, hard coat, and oxide layers, with an adhesive layer, designed to provide enhanced mechanical properties and optical transparency, including a combination of polymeric and inorganic materials to achieve improved impact resistance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If harder cover windows are used to provide increased protection, then impact resistance is improved, but flexibility and bendability deteriorate
Solution Approach 1:
The cover window is divided into multiple functional layers: a hard outer layer (glass, ceramic, or hard coating) for impact resistance, a middle elastomer layer for flexibility and stress absorption, and an inner adhesive layer for bonding. This segmentation allows each layer to perform its specialized function while working together as a unified protective structure.
Solution Approach 2:
The invention uses composite material construction combining rigid materials (glass, ceramic, hard coatings) with flexible materials (elastomers, polymeric adhesives). This composite structure integrates the high strength and scratch resistance of rigid materials with the flexibility and impact absorption of soft materials, resolving the contradiction between hardness and flexibility.
2Adaptability or versatility
If cover window thickness is reduced for flexible displays, then flexibility is improved, but impact resistance deteriorates
Solution Approach 1:
The multi-layer composite structure compensates for reduced overall thickness by concentrating protective functions in specific layers. The hard outer layer maintains scratch and impact resistance even at thin profiles, while the elastomer layer provides flexibility and shock absorption, enabling thin yet protective cover windows for flexible displays.
Solution Approach 2:
The invention employs thin-film technology to create a cover window assembly that is both thin and protective. The hard coating layers and thin glass/ceramic layers provide protection while maintaining flexibility, and the elastomer layers add compliance without significant thickness, enabling the cover window to bend with flexible displays.
3Strength
If multi-layer assembly is used to improve protection, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The cover window is segmented into distinct functional layers (hard protective layer, elastomer layer, adhesive layer), with each layer having a specific purpose. This segmentation allows for optimized performance of each function while maintaining a relatively simple overall structure that can be manufactured and assembled using standard processes.
Data Source
AI summary
The present invention is directed to a cover window assembly comprising a multi-layer films of polymeric and inorganic materials for a variety of articles, and the related articles and methods. The cover window assembly exhibits high resistance to strain and impact damage for the articles including display devices, particularly flexible display devices.