Top-Emission Display Low-Reflection Layer for Brightness Retention
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Solution Overview
Problem
Existing electroluminescent display apparatuses face challenges in reducing external light reflectance while maintaining high light efficiency, particularly in top emission configurations where external light is reflected by multiple metal layers, leading to interference and reduced brightness.
Innovation Solution
Incorporation of a low-reflection layer in the light emitting area, composed of a first layer made of metal oxide containing a group 6B element and a second layer of low-resistance metal, with specific patterns and spacing to minimize external light reflection and enhance light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple metal layers are stacked in the anode to reduce external light reflectance, then external light reflectance is reduced, but light efficiency deteriorates due to interference and light loss
Solution Approach 1:
The low-reflection layer is divided into multiple sub-layers with different materials and functions: a first low-reflection layer (Mo or W) for initial reflection reduction, a second low-reflection layer (MoO3 or WO3) for enhanced interference effect, and an optional third layer (Al2O3) for additional optimization. Each sub-layer contributes differently to the overall reflectance reduction while minimizing light loss
Solution Approach 2:
The invention uses composite material structure combining different metal oxides (MoO3, WO3) and metals (Mo, W, Al2O3) in specific combinations. These composite layers create optimized optical interference patterns that reduce external light reflectance more effectively than single-material layers, while maintaining better light transmission for display efficiency
2Object-affected harmful factors
If a low-reflection layer with large area ratio is used to reduce external light reflectance, then external light reflectance is reduced, but light efficiency deteriorates due to blocked light emission
Solution Approach 1:
The low-reflection layer is applied selectively only in specific regions where external light reflection is most problematic, rather than uniformly across the entire display surface. This localized application maintains reflectance reduction benefits in critical areas while preserving light emission efficiency in other regions
Solution Approach 2:
The patent applies low-reflection layer patterns with controlled area ratios (5-20% of total pixel area) rather than full coverage. This partial application is sufficient to reduce external light reflectance to acceptable levels while minimizing the blockage of emitted light, achieving the optimal balance between the two competing requirements
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 low-reflection layer effectively reduces external light reflectance and enhances light efficiency by utilizing destructive interference and optimized pattern design, maintaining brightness and improving display performance.
Implementation Method 1
the light introduced from the outside is reflected by a plurality of metal layers inside the anode, respectively, and thus interference occurs, so that the light introduced from the outside is extinguished
Data Source
AI summary
A display apparatus is disclosed. The display apparatus includes a sub-pixel having a light emitting area. The sub-pixel includes a low-reflection layer disposed in the light emitting area. The low-reflection layer includes a first layer and a second layer disposed on the first layer. The second layer contains a low-resistance metal. The first layer includes a metal oxide containing an element M, and the element M includes a group 6B element.