Display Device Meta-Layer With Patterned Metal for Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in improving reliability and efficiency, particularly in light extraction and interfacial adhesion between metal and metal oxide layers, leading to light loss and reduced performance.
Innovation Solution
A display device design incorporating a meta-layer with a patterned metal layer and a metal oxide layer, where the metal layer is patterned into rectangles and the metal oxide layer is formed through selective oxidation, enhancing interfacial adhesion and improving light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional metal layer is used without patterned structure, then the manufacturing process is simpler, but light extraction efficiency is reduced
Solution Approach 1:
The metal layer is segmented into a patterned structure with multiple rectangular regions rather than a continuous layer. This segmentation creates multiple metal-oxide interfaces that enhance light extraction efficiency by scattering and redirecting light paths, thereby reducing light loss while maintaining manufacturing feasibility through standard patterning processes
Solution Approach 2:
The metal layer is designed with spatially varying properties through the patterned structure, where different regions have different configurations of metal and metal oxide. This local quality variation optimizes light extraction in specific areas while maintaining overall device performance, addressing light loss without requiring complete structural redesign
2Loss of energy
If a metal oxide layer is added on the metal layer, then light extraction efficiency is improved, but interfacial adhesion becomes problematic
Solution Approach 1:
The patterned metal structure acts as an intermediary between the underlying layers and the metal oxide layer. By creating a non-continuous metal pattern, it provides a controlled interface that enhances adhesion through increased surface area and mechanical interlocking, while the metal oxide layer continues to provide optical benefits for light extraction
Solution Approach 2:
The structure employs a composite arrangement of metal and metal oxide layers with optimized thicknesses and patterns. This composite structure leverages the electrical and structural properties of metal combined with the optical and adhesive properties of metal oxide, achieving both improved light extraction and enhanced interfacial adhesion
3Loss of energy
If the metal layer is patterned into rectangles, then light extraction efficiency is enhanced, but manufacturing complexity increases
Solution Approach 1:
The metal layer is divided into simple rectangular patterns rather than complex shapes. These basic geometric forms can be efficiently manufactured using standard photolithography and etching processes, minimizing manufacturing complexity while still providing sufficient light extraction enhancement through the segmented structure
Solution Approach 2:
The rectangular pattern parameters (dimensions, spacing, orientation) are optimized to achieve effective light extraction without excessive complexity. By carefully selecting these parameters within practical manufacturing ranges, the design balances optical performance with ease of fabrication using conventional processes
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 enhances interfacial adhesion and improves light extraction efficiency by reducing light loss, thereby increasing the reliability and performance of the display device.
Implementation Method 1
the metal oxide layer may be formed through selective oxidation
Implementation Method 2
improving light extraction efficiency by reducing light loss
Data Source
AI summary
A display device including a substrate, a light-emitting element disposed on the substrate and including a subpixel electrode, an emission layer, and an opposite electrode, a capping layer disposed on the light-emitting element, and a meta-layer disposed on the capping layer and including a patterned metal layer and a metal oxide layer disposed on the metal layer.