Dual-Layer Connection Terminal for Display Substrate Signal Reliability
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Solution Overview
Problem
Display substrates with single metal layer connection terminals are prone to scratching or burnout during processing, leading to signal disruption and poor display quality.
Innovation Solution
Incorporating a dual-layer connection terminal with a sacrificial metal layer and a first conductive layer, where the sacrificial metal can maintain signal conduction if the first layer is scratched or burnt out, and both layers are made of materials like Ti/Al/Ti and Mo/ITO, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single metal layer is used for connection terminals, then the manufacturing process is simple, but the connection terminal is prone to scratching or burnout during processing, leading to signal disruption
Solution Approach 1:
The connection terminal is divided into multiple metal layers (first metal layer and second metal layer) instead of using a single layer. This segmentation allows the first metal layer to provide good conductivity while the second metal layer provides mechanical strength and scratch resistance, resolving the contradiction between manufacturing simplicity and signal conduction reliability.
Solution Approach 2:
The connection terminal uses composite metal layer structure where different metal materials are stacked together. The first metal layer (e.g., Al, Mo) provides electrical conductivity, while the second metal layer (e.g., Ti, W) provides mechanical strength and protection against scratching and burnout. This composite structure maintains signal conduction reliability while remaining compatible with existing manufacturing processes.
2Reliability
If a dual-layer connection terminal is used, then signal transmission reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The first metal layer and second metal layer are merged into a single integrated connection terminal structure that is formed together during the manufacturing process. This merging approach improves signal transmission reliability through the dual-layer design while avoiding excessive structural complexity by maintaining a unified formation process and simple geometric configuration.
3Productivity
If a dual-layer connection terminal is used, then production yield is enhanced, but the manufacturing process becomes more complicated
Solution Approach 1:
The first metal layer and second metal layer are formed in advance during the manufacturing process, before the connection terminal is actually needed for signal conduction. This preliminary action allows the dual-layer structure to be integrated into the existing manufacturing workflow, enhancing production yield without significantly complicating the overall manufacturing process.
Solution Approach 2:
The invention changes the structural parameters of the connection terminal by adding a second metal layer, which improves production yield by preventing defects. However, the parameter changes are implemented in a way that maintains compatibility with existing manufacturing processes, minimizing the increase in manufacturing complexity.
Data Source
AI summary
A display substrate, a manufacturing method thereof, and a display device are disclosed. The display substrate includes: a base substrate, the base substrate includes a bonding region; and a connection terminal located in the bonding region of the base substrate, the connection terminal includes a first conductive layer and a second conductive layer being in contact with each other, the first conductive layer and the second conductive layer are overlapped with each other in a direction perpendicular to the base substrate.