OLED Resonator Structure Optimizing Color Purity and Light Transmission
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Solution Overview
Problem
Existing OLED light emitting devices face challenges in enhancing color purity while maintaining light transmission, as increasing the thickness of reflection layers to improve reflectivity can lead to image deterioration due to decreased transmission and potential complications in device configuration.
Innovation Solution
A light emitting device configuration that includes a resonator structure with a translucent transflective layer between a high refractive index layer and a low refractive index layer, optimizing the optical distance and thickness to enhance resonation phenomena and maintain high light transmission, thereby improving color purity without compromising image brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the reflection layer is increased to improve reflectivity, then color purity is improved, but light transmission decreases causing image deterioration
Solution Approach 1:
The reflection layer is segmented into a first reflection layer and a second reflection layer with different thicknesses and optical properties. The first reflection layer has greater thickness for high reflectivity, while the second reflection layer has smaller thickness for light transmission, allowing both functions to coexist without compromising either color purity or image brightness
Solution Approach 2:
Different regions of the reflection layer structure are assigned different local qualities: the first reflection layer is designed with high reflectivity characteristics (greater thickness) to enhance color purity, while the second reflection layer is designed with light transmission characteristics (smaller thickness) to maintain image brightness, allowing each part to optimize its specific function
2Measurement precision
If the thickness of the reflection layer is increased to improve reflectivity, then color purity is improved, but device configuration becomes more complex
Solution Approach 1:
The first reflection layer and second reflection layer are merged into a single integrated reflection layer structure that functions as a unified component. This merging approach simplifies device configuration and manufacturing while achieving the dual functionality of high reflectivity and light transmission, avoiding the complexity of separate independent layers
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 increases color purity and reduces image deterioration by optimizing the resonator structure, ensuring efficient light transmission and simplifying device manufacturing while maintaining image brightness.
Implementation Method 1
there is known a technique (for example, a PCT pamphlet No. WO01/39554) for intensifying light having a specific wavelength among emitted light by use of amplified interference, that is, resonance
Implementation Method 2
a reflection layer which reflects light emitted from the light emitting function layer toward the light emitting function layer
Implementation Method 3
The translucent transflective layer is centered between a first layer having a refractive index n1 and being disposed on a side of the reflection layer and a second layer having a refractive index n2
Data Source
AI summary
A light emitting device includes: a light emitting element which includes a first electrode layer, a second electrode layer, and a light emitting function layer disposed between the first electrode and the second electrode; a reflection layer which reflects light emitted from the light emitting function layer toward the light emitting function layer; and a translucent transflective layer which is disposed opposite the reflection layer with the light emitting function layer interposed therebetween to reflect some of the light emitted from the light emitting function layer toward the light emitting function layer and to transmit the remainder of the light. The translucent transflective layer is centered between a first layer having a refractive index n1 and being disposed on a side of the reflection layer and a second layer having a refractive index n2 (where n2<n1) and being disposed opposite the first layer.