OLED Semi-Transparent Layer Thickness Optimization
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Solution Overview
Problem
Organic light-emitting devices face challenges in achieving high luminous efficiency and color purity due to variations in semi-transparent layer thickness and material, leading to chromaticity differences when viewed from different angles.
Innovation Solution
The use of organic light-emitting elements with micro cavity structures, where the thickness and material of semi-transparent layers are optimized for each emission color, allowing for differential thickness and material selection to enhance resonance and reduce chromaticity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If semi-transparent layers in different organic light-emitting elements have the same thickness, then the manufacturing process is simplified, but the transmittance and reflectance differ due to wavelength dispersibility, causing resonance intensity variations and reduced luminous efficiency
Solution Approach 1:
The patent applies local quality by setting different thicknesses for semi-transparent layers in different organic light-emitting elements based on their specific emission wavelengths. Each element's semi-transparent layer thickness is locally optimized to achieve optimal transmittance and reflectance for its wavelength, thereby maximizing resonance intensity and luminous efficiency for each element
Solution Approach 2:
The patent changes the physical parameter of semi-transparent layer thickness to resolve the contradiction. By adjusting the thickness parameter according to the emission characteristics of each organic light-emitting element, the patent achieves optimal optical performance while maintaining manufacturing feasibility through systematic parameter optimization
2Ease of manufacture
If semi-transparent layers have the same thickness, then production is easier, but chromaticity differences occur due to view angle variations
Solution Approach 1:
The patent applies local quality by customizing the thickness of semi-transparent layers for each organic light-emitting element according to its specific emission characteristics. This local optimization ensures that each element maintains consistent chromaticity across different viewing angles, thereby improving overall chromaticity uniformity in the display device
Solution Approach 2:
The patent changes the thickness parameter of semi-transparent layers to eliminate chromaticity differences. By optimizing this parameter for each element, the patent achieves consistent color output across different viewing angles while maintaining production consistency
3Loss of energy
If resonance intensity is increased to improve luminous efficiency, then more light is extracted, but chromaticity difference due to view angle increases
Solution Approach 1:
The patent applies local quality by optimizing the thickness of semi-transparent layers for each organic light-emitting element based on its specific emission wavelength. This localized optimization achieves the right balance between resonance intensity and chromaticity uniformity for each element, ensuring both high luminous efficiency and consistent color output
Solution Approach 2:
The patent changes the thickness parameter of semi-transparent layers to simultaneously optimize luminous efficiency and chromaticity uniformity. By carefully selecting thickness values for each element, the patent achieves optimal resonance intensity while maintaining consistent chromaticity across different viewing angles
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 improves luminous efficiency and reduces chromaticity variations across different viewing angles, resulting in a more robust and efficient organic light-emitting device with less production fluctuation.
Implementation Method 1
a micro cavity structure for resonating light emitted from the light-emitting layer between the reflective surface and the semi-transparent layer
Data Source
AI summary
The organic light-emitting device of the present invention includes a plurality of organic light-emitting elements including an organic light-emitting element showing a first emission color and at least one organic light-emitting element showing a different emission color from the first emission color, each of the organic light-emitting elements including: a first electrode having a reflective surface; a second electrode placed on a light extraction side and including a semi-transparent layer; an organic compound layer including a light-emitting layer and formed between the first electrode and the second electrode; and a micro cavity structure for resonating light emitted from the light-emitting layer between the reflective surface and the semi-transparent layer, wherein the semi-transparent layer in the organic light-emitting element showing the first emission color is different in thickness and/or material from the semi-transparent layer in the at least one organic light-emitting element showing the different emission colors.