Silver Alloy Opposite Electrode for Display Resolution
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Solution Overview
Problem
Current display apparatuses face challenges in achieving high image quality and efficient electrical signal transfer due to limitations in the materials and structures used for electrodes and wiring, leading to suboptimal resolution and performance.
Innovation Solution
The use of a silver alloy with at least one Group 15 metal element, indium, and zinc in the opposite electrode, combined with a layered structure and specific thicknesses, enhances the electrical properties and surface flatness, reducing resistivity and preventing agglomeration, thereby improving image quality and signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional materials and structures are used for electrodes and wiring, then manufacturing is simpler, but resolution and image quality are suboptimal
Solution Approach 1:
The patent employs composite material structures for electrodes, specifically using a multi-layer configuration comprising a first electrode layer, a second electrode layer, and a third electrode layer. Each layer is composed of specific materials (such as ITO, IZO, or ZnO) with controlled thicknesses to achieve optimal electrical properties and surface flatness, thereby improving resolution without excessive manufacturing complexity
Solution Approach 2:
The patent systematically varies critical parameters including the thickness of each electrode layer (e.g., first layer: 50-200 nm, second layer: 10-50 nm), the composition ratios of metal oxides, and the surface roughness specifications (Ra ≤ 5 nm) to optimize both image quality and manufacturability
2Reliability
If conventional electrode materials are used, then manufacturing is easier, but electrical signal transfer efficiency is insufficient
Solution Approach 1:
The patent uses composite electrode structures with multiple layers of different materials (e.g., ITO/IZO/ZnO combinations) where each material contributes specific properties: ITO provides high conductivity, IZO offers good transparency and flexibility, and ZnO enhances surface flatness. This composite approach achieves superior electrical signal transfer while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
The patent applies different material compositions and thicknesses to different regions and layers of the electrode structure. The first layer uses materials optimized for conductivity, the second layer for surface flatness control, and the third layer for protective and conductive properties, allowing each region to perform its specific function optimally
3Manufacturing precision
If simple electrode structures are used, then manufacturing is simpler, but surface flatness and resistivity are suboptimal
Solution Approach 1:
The patent employs a multi-layer composite electrode structure where each layer serves a specific function: the first layer (50-200 nm) provides base conductivity, the second layer (10-50 nm) acts as an intermediate buffer to control surface flatness, and the third layer provides final surface optimization. This composite structure achieves Ra ≤ 5 nm surface flatness while managing the complexity through systematic layer design
Solution Approach 2:
The patent transitions from a single-layer to a multi-layer electrode structure, adding the dimension of vertical layering to control surface flatness. By stacking layers with different material properties and thicknesses, the patent achieves superior surface flatness (Ra ≤ 5 nm) that cannot be obtained with conventional single-layer structures
Data Source
AI summary
A display apparatus includes a substrate, and a display element disposed over the substrate, wherein the display element includes a pixel electrode, an emission layer disposed on the pixel electrode, and an opposite electrode covering the emission layer, and wherein the opposite electrode includes a silver (Ag) alloy including Ag, at least one of Group 15 metal elements, and indium (In).