Indium-Oxide Electrode Patterning for Ultra-High-Resolution Displays
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Solution Overview
Problem
Existing electrode manufacturing technologies face challenges in achieving high resolution and efficient manufacturing processes, particularly for wearable electronic devices that require fine structures with ultra-high resolution.
Innovation Solution
The proposed electrode structure includes a first layer with a transparent conductive oxide containing indium, where the indium content varies between different areas, and is supported by a metal layer and an aluminum oxide layer. The manufacturing method involves forming a preliminary first layer, creating a photoresist pattern, and etching using hydrogen and argon plasmas to achieve the desired structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a uniform indium content is used throughout the first layer, then the manufacturing process is simple, but the etching precision and pattern definition are insufficient for ultra-high resolution
Solution Approach 1:
The first layer is designed with non-uniform indium content distribution, where the indium content varies across different regions of the layer. This local variation in material composition enables different etching rates in different areas, allowing precise pattern definition and edge sharpness required for ultra-high resolution displays while maintaining a single-layer structure.
Solution Approach 2:
The indium content parameter is changed spatially across the first layer, creating regions with different indium concentrations. This parameter variation allows the etching process to achieve higher precision by exploiting the differential etching rates between regions with different indium content, thereby improving pattern definition without increasing structural complexity.
2Manufacturing precision
If conventional single plasma etching is used, then the manufacturing process is fast, but the pattern definition and edge sharpness are insufficient
Solution Approach 1:
The etching process is segmented into two distinct plasma treatment steps: a first plasma treatment that creates initial pattern definition, and a second plasma treatment that refines the pattern and sharpens edges. This segmentation of the etching process into multiple stages achieves superior pattern definition and edge sharpness while maintaining reasonable manufacturing efficiency through automated sequential processing.
Solution Approach 2:
The first plasma treatment performs a preliminary etching action that prepares the surface and creates initial pattern definition. This preliminary action enables the second plasma treatment to focus on refining and sharpening the patterns, thereby achieving high-quality pattern definition without requiring the second step to perform all etching functions, which improves overall process efficiency.
3Reliability
If the first layer thickness is increased, then the conductive performance is improved, but the resolution and fine structure capability deteriorate
Solution Approach 1:
The first layer employs non-uniform indium content distribution rather than uniform thickness increase to improve conductive performance. By concentrating indium in specific regions, the layer achieves enhanced conductivity where needed while maintaining thin overall thickness, thereby preserving the ability to form fine structures and achieve high resolution patterns.
Solution Approach 2:
The first layer is designed as a composite transparent conductive oxide material with spatially varying indium content. This composite structure combines regions of different indium concentrations to achieve both high conductive performance and fine structure capability, avoiding the resolution limitations that would result from simply increasing the overall layer thickness.
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
This approach enhances manufacturing efficiency and reliability while achieving high resolution, suitable for ultra-high resolution applications such as head-mounted devices with 3000 ppi or more.
Implementation Method 1
a first step of providing first plasma including hydrogen (H2) plasma on the preliminary first layer, and a second step of providing second plasma on the preliminary first layer, after the first step. The indium in the transparent conductive oxide agglomerates by the first plasma and forms an agglomeration pattern in the first step.
Implementation Method 2
Providing the second plasma in the second step etches the agglomeration pattern.
Data Source
AI summary
An electrode according to an embodiment of the present disclosure includes a first layer including a transparent conductive oxide containing indium. The first layer includes a first area and a second area surrounding at least a portion of the first area. The indium content of a surface of the first layer corresponding to the first area is greater than the indium content of a surface of the first layer corresponding to the second area.