Display Substrate Barrier Layer Prevents Silver Migration
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Solution Overview
Problem
Silver migration between adjacent wires in flexible display devices leads to short circuits due to the reaction of silver with water vapor and potential differences, which is not effectively addressed by increasing the spacing between wires in narrow bezel designs.
Innovation Solution
A display substrate design featuring first and second wires with a migratable metal layer, where a barrier layer is positioned between the second wire and the base substrate to prevent water vapor invasion and metal migration, ensuring the wires are on different planes, thereby lengthening the migration path and reducing the likelihood of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spacing between adjacent wires is increased to prevent silver migration, then the reliability is improved, but the device complexity increases and the available space is reduced
Solution Approach 1:
A barrier layer is introduced as an intermediary substance between adjacent wires to prevent silver migration. The barrier layer acts as a mediator that blocks the interaction between migratable metal ions and water vapor, eliminating the need for increased wire spacing while maintaining reliability
Solution Approach 2:
The solution transitions from addressing silver migration in the horizontal plane (increasing wire spacing) to addressing it in the vertical dimension (introducing a barrier layer between the wires and the base substrate). This dimensional shift allows wires to remain closely spaced while still preventing migration paths
2Reliability
If the spacing between wires is increased to prevent short circuits, then the reliability is improved, but the area occupied by wires is reduced
Solution Approach 1:
The barrier layer serves as a mediating structure that enables dense wire packing by preventing migration through chemical isolation rather than physical separation
Solution Approach 2:
The invention changes the parameter of wire spacing from a critical design constraint to a flexible parameter by introducing the barrier layer, allowing wires to be positioned closer together without increasing short circuit risk
3Reliability
If a barrier layer is introduced to block water vapor and prevent metal migration, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The barrier layer performs multiple functions simultaneously: it blocks water vapor invasion, prevents metal ion migration, and provides electrical isolation between adjacent wires. This multi-functionality reduces the need for additional separate components
Solution Approach 2:
The barrier layer is constructed from composite materials with specific properties (water vapor barrier, electrical insulation, chemical stability) that enable it to perform multiple protective functions in a single layer structure
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
Effectively prevents metal migration and subsequent short circuits by blocking water vapor and raising the wires to different heights, enhancing the reliability and durability of flexible display devices.
Implementation Method 1
a first barrier layer on a side of the base substrate... a second wire on a side of the first barrier layer distal to the base substrate... blocking water vapor invasion
Implementation Method 2
the first wires and the second wire are spaced apart from each other... prevent metal migration... lengthening the migration path
Data Source
AI summary
The present disclosure provides a display substrate, a method for manufacturing the same and a display device. The display substrate includes a base substrate, first wires on a side of the base substrate, a first barrier layer on the side of the base substrate; and a second wire on a side of the first barrier layer distal to the base substrate, where the first wires and the second wire being adjacent to and spaced apart from each other.