Multi-Layer Connection Wire for Flexible Display Bending Reliability
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Solution Overview
Problem
Display devices with flexible substrates face challenges in maintaining reliability and preventing electrical degradation in the bending area due to the degradation or cutting of conductive wires during panel bending.
Innovation Solution
A display device design featuring a substrate with a bending area where a connection wire, formed by discontinuously depositing multiple conductive layers with a small grain size, connects conductive wires across the bending area, enhancing flexibility and reducing the risk of wire degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer conductive wire is used in the bending area, then the manufacturing process is simple, but the flexibility and reliability during bending are poor
Solution Approach 1:
The connection wire is divided into multiple conductive layers (first conductive layer, second conductive layer, and third conductive layer) stacked in the thickness direction. Each layer has a grain size of 100 nm or less, creating a multi-layered segmented structure that enhances flexibility and reliability in the bending area while maintaining electrical conductivity.
2Reliability
If the grain size of conductive layers is reduced to 100 nm or less, then flexibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The grain size of the conductive layers is controlled to be 100 nm or less through specific manufacturing parameters. This parameter change enables the connection wire to achieve high flexibility and bendability in the bending area while maintaining adequate electrical conductivity, resolving the contradiction between flexibility and manufacturing precision.
3Reliability
If multiple conductive layers are stacked, then flexibility and reliability are improved, but manufacturing complexity increases
Solution Approach 1:
Multiple conductive layers (first, second, and third conductive layers) are merged and stacked in the thickness direction to form an integrated connection wire structure. This merging approach improves flexibility and electrical characteristics stability while the layers are formed through a coordinated manufacturing process that manages the complexity of producing multiple layers.
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 solution increases the flexibility of the connection wire in the bending area, improving the reliability of the bending area and maintaining excellent electrical characteristics of the display panel.
Implementation Method 1
The connection wire includes a plurality of conductive layers contacting each other, the plurality of conductive layers including a same material
Data Source
AI summary
A display device includes: a substrate including a display area, a non-display area at which the image is not displayed and a first area including the display area, the non-display area including a bending area at which the display device is bendable between the first area and a second area; a first wire in the first area, the first wire and connected to the display area; a second wire in the second area; a protection layer in the first, second and bending areas, first and second contact holes in the protection layer and exposing the first and second wires; and a connection wire connected to the first wire, extended from the first area to traverse the bending area and connected to the second wire. The connection wire includes a plurality of conductive layers contacting each other, the plurality of conductive layers including a same material.