Titanium Nitride Oxidation Resistant Layer for Flexible Display
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Solution Overview
Problem
Flexible display devices face challenges in preventing the formation of metal oxides that can lead to stains due to oxidation and non-uniform etching, which affects their visibility and manufacturing processes.
Innovation Solution
Incorporating a titanium nitride oxidation resistant layer between the organic layer and metal layers, with specific thickness and nitrogen-to-titanium ratios, to prevent metal oxide formation and facilitate simultaneous etching of the metal layers for wiring formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal layers are directly deposited on the organic layer, then the manufacturing process is simplified, but metal oxides form causing visible stains
Solution Approach 1:
A titanium nitride layer is introduced as an intermediary between the organic layer and the metal layer. This intermediate layer prevents direct contact between the metal and organic materials, thereby preventing metal oxide formation and stain visibility while maintaining manufacturing feasibility through a single-layer deposition process.
2Manufacturing precision
If multiple separate etching processes are used for different metal layers, then etching precision is improved, but manufacturing complexity and time increase
Solution Approach 1:
Multiple metal layers with different etching rates are combined into a single etching process. The titanium nitride layer serves as a common etching reference that enables simultaneous etching of multiple metal layers, achieving both precision and process simplification by merging separate operations into one unified process.
3Reliability
If a thick oxidation resistant layer is used, then protection against oxidation is improved, but etching uniformity deteriorates
Solution Approach 1:
The thickness of the titanium nitride layer is optimized to a specific range (50-200 nm) to balance oxidation protection and etching uniformity. By changing the thickness parameter to an optimal value, the layer provides sufficient oxidation resistance while maintaining uniform etching characteristics across the layer.
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 effectively reduces the visibility of stains and simplifies the manufacturing process by preventing metal oxide formation and ensuring uniform etching, enhancing the flexibility and reliability of flexible display devices.
Implementation Method 1
a first oxidation resistant layer between the organic layer and the first metal layer, the first oxidation resistant layer including a nitride of the first metal
Implementation Method 2
simultaneously etching the first oxidation resistant layer, the first metal layer, and the second metal layer to form a wiring
Data Source
AI summary
A display device may include an organic layer, a first metal layer on the organic layer, the first metal layer including a first metal, and a first oxidation resistant layer between the organic layer and the first metal layer, the first oxidation resistant layer including a nitride of the first metal.