Display Device Anti-Reflection Layer and Filling Layer
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Solution Overview
Problem
Conventional organic light emitting display devices face issues with external light reflection due to metal patterns, which are mitigated by polarizing plates but result in decreased light transmittance.
Innovation Solution
A display device configuration including a base substrate, an emission element, a capping layer, an anti-reflection layer with inorganic materials, a filling layer with transparent materials like silicone-based resins, and an encapsulation substrate, optimized to reduce reflectance by adjusting the thickness and refractive index of the capping and filling layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used to prevent reflection of external light, then reflection is reduced, but light transmittance from the display device decreases
Solution Approach 1:
The patent changes the optical parameters (refractive index and thickness) of the filling layer to optimize the balance between reducing external light reflection and maintaining light transmittance. By adjusting the refractive index to be between 1.3 and 1.6 and the thickness to be between 280-360 Å, the device achieves reduced reflectance while preserving adequate light transmission from the emission element.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers with different materials and optical properties: a capping layer, an anti-reflection layer, a filling layer with specific refractive index, and an encapsulation substrate. This composite approach allows each layer to contribute differently to the overall optical performance, reducing external light reflection while maintaining light transmittance.
2Object-affected harmful factors
If the capping layer thickness is increased to reduce reflectance, then external light reflection decreases, but the overall device structure becomes more complex
Solution Approach 1:
The patent optimizes the capping layer thickness to a specific range (280-360 Å) to achieve effective reflectance reduction while avoiding excessive thickness that would increase device complexity. This parameter optimization allows the layer to perform its anti-reflection function efficiently without adding unnecessary structural complexity.
Solution Approach 2:
The patent applies a filling layer with refractive index between 1.3 and 1.6, which provides sufficient anti-reflection performance without requiring excessive thickness. This partial action approach achieves the desired optical effect with minimal structural addition, avoiding over-engineering the layer thickness.
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 proposed configuration effectively reduces reflectance from external light, thereby enhancing the display quality by maintaining light transmittance while minimizing external light reflection.
Implementation Method 1
an anti-reflection layer disposed on the capping layer; a filling layer disposed on the anti-reflection layer and having a refractive index of about 1.3 to about 1.6
Implementation Method 2
a filling layer disposed on the anti-reflection layer and having a refractive index of about 1.3 to about 1.6
Data Source
AI summary
A display device includes: a base substrate, an emission element disposed on the base substrate, a capping layer disposed on the emission element and having a thickness of about 280 Å to about 360 Å, an anti-reflection layer disposed on the capping layer, a filling layer disposed on the anti-reflection layer and having a refractive index of about 1.3 to about 1.6, and an encapsulation substrate disposed on the filling layer.