Grooved Metal Sheet for Flexible Display Moisture Barrier
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Solution Overview
Problem
Flexible displays face issues with moisture and oxygen penetration, leading to corrosion and delamination of layers, especially when rolled, due to contact between the metal sheet and the back film in high humidity environments, causing reliability and stability concerns.
Innovation Solution
Incorporating a metal sheet with grooves that extend from one side to the other, allowing for moisture discharge and adjusting the thickness and position of the neutral surface to distribute stress, thereby preventing tensile stress on vulnerable layers and enhancing flexibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal sheet is added to prevent moisture and oxygen penetration, then reliability is improved, but device complexity increases
Solution Approach 1:
The metal sheet is segmented by forming grooves that divide it into multiple regions. These grooves create a segmented structure that allows moisture to be discharged while maintaining the barrier function in other areas, thus improving reliability without excessive complexity
Solution Approach 2:
The metal sheet is designed with groove structures that create controlled porous pathways. These grooves allow selective passage of moisture while maintaining barrier properties against oxygen and other contaminants, achieving improved reliability through a modified rather than completely complex structure
2Reliability
If the metal sheet is made thicker to improve barrier performance, then reliability is improved, but flexibility deteriorates
Solution Approach 1:
By segmenting the metal sheet through grooves, the effective barrier thickness is maintained in the wall portions while the grooves create flexibility pathways. This segmented approach allows the sheet to bend and flex without compromising the moisture barrier performance of the intact metal regions
Solution Approach 2:
Different regions of the metal sheet have different properties: the groove walls maintain thick barrier properties for moisture protection, while the groove regions themselves provide flexibility and stress relief. This local differentiation allows simultaneous achievement of reliability and flexibility
3Reliability
If grooves are added to the metal sheet to discharge moisture, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The groove structure segments the metal sheet into functional regions. The segmentation creates discrete moisture discharge pathways that are easier to control and manufacture with standard precision, rather than requiring uniform precision across the entire sheet structure
Solution Approach 2:
The groove parameters (depth, width, spacing) are optimized to achieve effective moisture discharge within manufacturable tolerance ranges. By carefully selecting these parameters, the design achieves reliability improvement while remaining compatible with existing manufacturing precision capabilities
4Adaptability or versatility
If grooves are formed in the metal sheet, then flexibility is improved, but strength deteriorates
Solution Approach 1:
The grooves segment the metal sheet structure, creating regions that can flex independently. This segmentation allows the sheet to accommodate bending and deformation while the remaining intact metal regions maintain overall structural strength
Solution Approach 2:
The metal sheet exhibits local quality variations where groove regions provide flexibility and bending capability, while the groove wall regions maintain structural strength and barrier function. This spatial differentiation of properties resolves the contradiction between flexibility and strength
Data Source
AI summary
A flexible display is disclosed. The flexible display includes a substrate having a pixel array and a metal sheet disposed on the substrate and covering the pixel array. The metal sheet includes a groove that extends from one side to the other side of the metal sheet and has a predetermined depth. The groove includes at least one first groove extended in a first direction and at least one second groove extended in a second direction intersecting the first direction.