Aluminum-Silver Multilayer Electrodes for Fine-Pattern Displays
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Solution Overview
Problem
Existing display devices, particularly those used in head-mounted displays, face challenges in achieving high reflectivity while manufacturing fine patterns, which is essential for high-resolution images required for virtual and augmented reality applications.
Innovation Solution
A display device structure comprising a substrate with a first electrode having multiple pattern layers, including a first pattern layer of aluminum with a specific thickness and area, a second pattern layer of transparent conductive material, a third pattern layer of silver, and a fourth pattern layer of transparent conductive material, optimized for high reflectivity and fine pattern manufacturing through a combination of wet and dry etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer aluminum electrode is used, then the manufacturing process is simple, but the reflectivity is insufficient for high-resolution displays
Solution Approach 1:
The patent applies composite materials by creating a multi-layer electrode structure combining aluminum (first pattern layer) with silver (third pattern layer). This composite structure achieves superior reflectivity compared to single-layer aluminum, resolving the contradiction between manufacturing simplicity and reflectivity requirements for high-resolution displays.
Solution Approach 2:
The patent transitions from a single-layer (one-dimensional) aluminum electrode to a multi-layer (three-dimensional) structure with alternating conductive and reflective layers. This dimensional expansion enables enhanced optical properties while maintaining electrical functionality, solving the reflectivity insufficiency of simple single-layer electrodes.
2Illumination intensity
If multiple pattern layers are used to improve reflectivity, then the reflectivity increases, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the electrode into distinct functional layers: first pattern layer (aluminum for conductivity), second pattern layer (transparent conductive material), and third pattern layer (silver for reflectivity). This segmentation allows each layer to perform its specific function optimally, achieving high reflectivity while maintaining manageable manufacturing complexity through clear functional division.
Solution Approach 2:
The multi-layer electrode structure serves multiple functions simultaneously: the aluminum layer provides electrical conductivity and initial reflectivity, the transparent conductive material layer maintains electrical connection while allowing light transmission, and the silver layer enhances overall reflectivity. This multi-functionality reduces the need for separate components, managing complexity while achieving superior performance.
3Manufacturing precision
If thin layers are used for fine patterns, then the pattern resolution improves, but the reflectivity decreases
Solution Approach 1:
The patent uses composite materials with different optical properties in thin-layer configuration. The silver layer (third pattern layer) provides high reflectivity even at thin thicknesses, while the aluminum layer (first pattern layer) contributes both conductivity and reflectivity. This composite approach maintains fine pattern resolution with thin layers while preserving sufficient overall reflectivity through material synergy.
Solution Approach 2:
The patent applies local quality by assigning different materials with specialized properties to different layers: aluminum for conductivity and baseline reflectivity, transparent conductive material for electrical connection with light transmission, and silver for enhanced reflectivity. Each layer's local material quality compensates for the thinness, maintaining both fine pattern capability and sufficient reflectivity.
4Illumination intensity
If metal layers are used for high reflectivity, then the reflectivity improves, but metal diffusion occurs degrading image quality
Solution Approach 1:
The patent introduces transparent conductive material layers (second and fourth pattern layers) as intermediaries between the metal layers (aluminum and silver). These intermediary layers prevent direct contact between dissimilar metals, thereby preventing metal diffusion while maintaining electrical conductivity and light transmission, thus preserving image quality while achieving high reflectivity.
Solution Approach 2:
The patent applies preliminary action by placing protective transparent conductive material layers before potential diffusion can occur. These barrier layers are deposited on the metal surfaces in advance, creating a diffusion barrier that prevents harmful metal interaction during subsequent processing or device operation, thus preventing image quality degradation before it can happen.
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 enables the production of a display device with high reflectivity and fine patterns, reducing power consumption and enhancing image quality by minimizing metal diffusion and allowing for efficient manufacturing of high-resolution images.
Implementation Method 1
a first pattern layer containing aluminum; a third pattern layer on the second pattern layer and containing silver
Data Source
AI summary
A display device, more particularly, to a display device capable of manufacturing fine patterns while having high reflectivity, an optical device, and a method of manufacturing the display device is provided. A display device includes: a substrate; a first electrode on the substrate; a light emitting layer on the first electrode; and a second electrode on the light emitting layer, the first electrode including: a first pattern layer including aluminum; a second pattern layer on the first pattern layer and including a transparent conductive material; a third pattern layer on the second pattern layer and including silver; and a fourth pattern layer on the third pattern layer and including a transparent conductive material.