Multi-Layer Conductive Pattern for Flexible Display Crack Resistance
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Solution Overview
Problem
Flexible display devices face challenges in preventing cracks when bent due to the limitations in securing both flexibility and reliability of the conductive patterns, which are often compromised by the thickness and grain size of single-layer conductive structures.
Innovation Solution
A flexible display device is designed with multiple conductive pattern layers of varying thickness and materials, where the first conductive pattern layer has a thickness between 100 and 1500 angstroms, and subsequent layers have thinner thicknesses, ensuring grain size control and reduced dislocation, thereby enhancing flexibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer conductive pattern is used, then the manufacturing process is simple, but the reliability and flexibility are compromised due to cracking during bending
Solution Approach 1:
The conductive pattern is divided into multiple layers (first conductive pattern layer and second conductive pattern layer) with different thicknesses and materials. The first layer has greater thickness for mechanical strength, while the second layer has smaller thickness for flexibility, preventing cracks during bending operations
Solution Approach 2:
The patent uses composite conductive pattern structure combining different materials with different thicknesses. The first conductive pattern layer uses a material with greater thickness for structural integrity, while the second layer uses a different material with smaller thickness to maintain flexibility and prevent cracking
2Reliability
If the conductive pattern layer thickness is increased, then the electrical conductivity is improved, but the flexibility and crack resistance are reduced
Solution Approach 1:
Different regions of the conductive pattern have different thicknesses and materials. The first conductive pattern layer has greater thickness for areas requiring electrical conductivity, while the second conductive pattern layer has smaller thickness for areas requiring flexibility, optimizing both properties locally
Solution Approach 2:
The solution moves from a single-layer two-dimensional structure to a multi-layer three-dimensional structure. By stacking conductive layers with different thicknesses and materials, the patent achieves both high conductivity and flexibility through vertical dimensionality
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 multi-layer conductive pattern structure significantly reduces the probability of cracks and disconnections when the device is repeatedly bent, improving its reliability and flexibility.
Implementation Method 1
supplying a first gas to form a first conductive pattern layer having a first thickness on the flexible substrate
Implementation Method 2
supplying a second gas different from the first gas to form a second conductive pattern layer having a second thickness smaller than the first thickness on the first conductive pattern layer
Data Source
AI summary
A flexible display device includes a flexible substrate and a conductive pattern. The flexible substrate includes a bending part. The conductive pattern includes a first conductive pattern layer and a second conductive pattern layer disposed on the first conductive pattern layer, and at least a portion of the conductive pattern may be disposed on the bending part. The first conductive pattern layer has a first thickness and includes a first material, and the second conductive pattern layer has a second thickness smaller than the first thickness and includes a second material different from the first material.