Microcavity Light-Emitting Element for Wider Viewing Angles
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Solution Overview
Problem
Light-emitting elements using a microcavity system suffer from low viewing angle characteristics due to wavelength shifts and luminance differences when viewed from different angles.
Innovation Solution
Incorporating a light reflective layer, a first electrode, a second electrode, and an optical function layer with specific reflectivity properties to create multiple optical path lengths, enhancing resonance conditions for light emission across various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a microcavity system is used in a light-emitting element, then the light emission efficiency is improved, but the viewing angle characteristic deteriorates
Solution Approach 1:
The optical function layer is divided into multiple sub-layers with different refractive indices and thicknesses. Each sub-layer creates specific optical path lengths that work together to improve viewing angle characteristics while maintaining the microcavity system's light emission efficiency. The segmentation allows independent optimization of each layer's optical properties.
Solution Approach 2:
Different regions of the optical function layer are designed with locally optimized properties. The first optical function layer has different characteristics from the second optical function layer, allowing each region to contribute specifically to resolving the viewing angle problem while preserving the overall microcavity resonance effect.
2Adaptability or versatility
If an optical function layer with intermediate reflectivity is added, then the viewing angle characteristic is improved, but the device complexity increases
Solution Approach 1:
The optical function layer performs multiple functions simultaneously: it controls optical path lengths, manages light reflection and transmission, and maintains resonance conditions. By making this single layer multi-functional, the patent avoids adding multiple separate components, thus improving viewing angle characteristics without proportionally increasing device complexity.
Solution Approach 2:
The optical function layer uses composite material structures with different refractive indices arranged in specific sequences. This composite approach allows the layer to achieve complex optical functions through material properties rather than through increased structural complexity, resolving the contradiction between performance improvement and device simplicity.
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
Improves the viewing angle characteristic by reducing color drift and maintaining consistent luminance across different viewing directions, thereby widening the angle at which the light-emitting element can be effectively viewed.
Implementation Method 1
an optical function layer disposed between the light reflective layer and the first electrode and having a light reflectivity lower than that of the light reflective layer and higher than that of the first electrode
Implementation Method 2
a light-emitting layer disposed between the first electrode and the second electrode
Implementation Method 3
A light-emitting element that uses a microcavity system
Implementation Method 4
having a light reflectivity lower than that of the light reflective layer and higher than that of the first electrode
Data Source
AI summary
A light-emitting element includes a light reflective layer, a first electrode above the light reflective layer, a second electrode above the first electrode, a light-emitting layer between the first electrode and the second electrode, and an optical function layer disposed between the light reflective layer and the first electrode and having a light reflectivity lower than that of the light reflective layer and higher than that of the first electrode.