Light Emitting Device Control Layer Optical Distance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light emitting devices face issues with luminous intensity deviation and color reproducibility due to uniform protecting layer thickness, which affects light interference and efficiency, leading to reduced luminous intensity and deteriorated color purity.
Innovation Solution
The introduction of a control layer between the second electrode and the protecting layer in a light emitting device, which adjusts the optical distance to enhance both traveling and reflected waves, optimizing light intensity and color purity by controlling the layer thickness based on specific formulas to satisfy phase variation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protecting layer thickness is increased to improve moisture blocking, then the blocking property improves, but the fabrication time increases and peeling-off due to film stress occurs
Solution Approach 1:
The protecting layer is divided into multiple sub-layers (first protecting layer, second protecting layer, third protecting layer) with different materials and thicknesses. Each layer provides specific protection functions, achieving sufficient moisture blocking without requiring excessive total thickness, thus reducing fabrication time and film stress.
Solution Approach 2:
The protecting layer uses composite material structure combining inorganic materials (silicon nitride, silicon oxide) with different properties. The first protecting layer uses high-density silicon nitride for primary barrier, while second and third layers use silicon oxide for additional protection and stress management, achieving optimal balance between blocking performance and film stability.
2Stability of the object's composition
If the protecting layer thickness is uniform to prevent peeling-off, then film stability improves, but luminous intensity deviation and color deviation occur
Solution Approach 1:
Different regions of the protecting layer structure are assigned different thicknesses and materials based on local requirements. The first protecting layer has uniform thickness for stability, while the second and third layers have optimized thicknesses (50-200 nm and 10-50 nm) to control optical interference and light extraction efficiency, achieving both film stability and luminous uniformity.
3Loss of energy
If the protecting layer thickness is optimized for light extraction, then luminous efficiency improves, but moisture blocking becomes insufficient
Solution Approach 1:
The protecting layer is segmented into multiple functional layers: the first layer (200-500 nm silicon nitride) provides primary moisture blocking, while the second (50-200 nm silicon oxide) and third (10-50 nm silicon oxide) layers optimize optical properties for light extraction. This segmentation allows each layer to specialize in either protection or light management.
Solution Approach 2:
The multi-layer composite structure combines silicon nitride (high barrier property) with silicon oxide (good optical properties) to achieve both excellent moisture blocking and optimized light extraction efficiency, resolving the trade-off between protection and luminous performance.
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 configuration improves luminous intensity deviation and color deviation, ensuring good color purity and reproducibility by optimizing light interference within the device.
Implementation Method 1
a structure in which both a traveling wave of light and a reflected wave of light enhance intensity of light in each of the plurality of luminous elements
Implementation Method 2
a large light reflection is generated at the interface surface between the former (transparent material) and the latter (opaque material) since there exists a large refractivity difference at the interface surface therebetween
Data Source
AI summary
There is provided a light emitting device having a plurality of luminous elements emitting with different colors respectively being improved in a luminous intensity deviation and a color deviation without deterioration of a luminous efficiency. In the light emitting device having a plurality of luminous elements respectively emitting with different colors, both a traveling wave of light and a reflected wave of light enhance intensity of light.