Diamond-Shaped Wire Configuration for Flexible Display Substrates
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Solution Overview
Problem
Flexible display devices face mechanical stress issues when bent, leading to cracking and delamination due to tensile stress, which can cause defects and disconnection of wires, especially at the bending portion of the substrate.
Innovation Solution
The flexible organic light emitting display device features wires formed in diamond shapes connected to each other, with portions extending in different directions to minimize tensile force and reduce the risk of breakage, and a method of manufacturing that includes forming these wires on a flexible substrate with a bending area designed to absorb strain by varying widths and lengths of wire segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wires are formed in straight lines across the bending area, then electrical connection is simple and direct, but mechanical stress causes cracking and disconnection at the bent portion
Solution Approach 1:
The wire is formed in a diamond shape pattern instead of a straight line, creating curved segments that can flex and absorb mechanical stress during bending. This curved configuration prevents stress concentration and cracking while maintaining electrical connectivity across the bending area.
Solution Approach 2:
The wire is divided into multiple segments forming the diamond shape pattern, with each segment capable of independently accommodating mechanical deformation. This segmentation allows the wire to maintain electrical connection reliability while distributing mechanical stress across multiple sections rather than concentrating it in a single straight path.
2Strength
If the wire width is increased to reduce stress concentration, then mechanical strength improves, but the device area and complexity increase
Solution Approach 1:
The diamond shape pattern provides inherent mechanical strength through its curved geometry, eliminating the need to increase wire width. The curved segments distribute stress more effectively, maintaining wire strength while preserving a compact device area and avoiding additional structural complexity.
3Reliability
If the wire follows a complex diamond shape pattern, then mechanical stress is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The diamond shape pattern consists of simple linear segments that are easier to manufacture with high precision compared to complex curved paths. Each segment can be formed using standard photolithography and deposition processes, reducing manufacturing precision requirements while still providing effective stress distribution through the segmented structure.
Data Source
Figure 1a~1c
Figure 1d~1f
Figure 1g~1i
AI summary
A flexible display substrate, a flexible organic light emitting display device, and a method of manufacturing the same are provided. The flexible display substrate comprises a flexible substrate including a display area and a non-display area extending from the display area, a first wire formed on the display area of the flexible substrate, and a second wire formed on the non-display area of the flexible substrate, wherein at least a part of the non-display area of the flexible substrate is curved in a bending direction, and the second wire formed on at least a part of the non-display area of the flexible substrate includes a first portion formed to extend in a first direction and a second portion formed to extend in a second direction.