OLED Resonance Structure with Uneven Pattern for Color Shift
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Solution Overview
Problem
Conventional organic light-emitting display apparatuses suffer from color shift issues when viewed from different angles due to their design, which affects light extraction efficiency and color reproduction.
Innovation Solution
The use of a resonance structure with an uneven pattern unit, including insulating films with different refractive indices, is implemented to reduce color shift and enhance light extraction efficiency by forming a distributed bragg reflector (DBR) structure, which is achieved through a specific manufacturing process involving multiple mask operations and layer formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat structure is used in organic light-emitting display apparatuses, then the manufacturing process is simple, but color shift occurs when viewed from different angles
Solution Approach 1:
The patent introduces an uneven pattern unit with asymmetric structure into the display apparatus. This uneven pattern includes insulating films with different refractive indices arranged in a non-uniform configuration, which creates directional light control to reduce color shift when viewed from different angles, while maintaining manufacturing feasibility through pattern formation processes
Solution Approach 2:
The uneven pattern unit is selectively formed in specific regions of the display apparatus rather than uniformly across the entire structure. This localized approach allows the patent to address color shift issues in critical viewing areas while maintaining the simplicity of the overall manufacturing process and not requiring complete restructuring of the entire device
2Loss of energy
If insulating films with different refractive indices are stacked to form DBR structure, then light extraction efficiency is improved, but device structure becomes more complex
Solution Approach 1:
The patent utilizes changes in the refractive index parameter by stacking insulating films with different refractive indices to form a distributed bragg reflector (DBR) structure. This parameter-based approach enables effective light extraction enhancement through optical interference effects without requiring complex mechanical or structural modifications to the device architecture
Solution Approach 2:
The DBR structure with stacked insulating films creates continuous optical feedback and light reflection throughout the uneven pattern unit. This continuous optical action maintains high light extraction efficiency across different viewing angles by continuously reflecting and redirecting light waves, ensuring consistent performance without requiring additional active components
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 effectively minimizes color shift and improves light extraction efficiency and color reproduction by utilizing a DBR resonance structure, ensuring consistent display quality across various viewing angles.
Implementation Method 1
The use of a resonance structure with an uneven pattern unit, including insulating films with different refractive indices, is implemented to reduce color shift and enhance light extraction efficiency by forming a distributed bragg reflector (DBR) structure
Implementation Method 2
The use of a resonance structure with an uneven pattern unit is implemented to reduce color shift and enhance light extraction efficiency
Implementation Method 3
including insulating films with different refractive indices
Implementation Method 4
forming a distributed bragg reflector (DBR) structure
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate, a thin film transistor (TFT) on the substrate, the TFT including an active layer, a gate electrode, a source electrode, and a drain electrode, an uneven pattern unit on the substrate and spaced apart from the TFT, the uneven pattern including an insulating film, a pixel electrode on the uneven pattern unit, an intermediate layer on the pixel electrode and including an organic light-emitting layer, and a counter electrode on the intermediate layer.