Electroluminescent Display Insulation Layers for Color Gamut
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Solution Overview
Problem
Existing electroluminescent display devices have a narrow color gamut due to difficulties in obtaining red, green, and blue light emitting materials with uniform lifetimes and efficiencies, which limits their color representation capabilities.
Innovation Solution
The electroluminescent display device incorporates a substrate with a first electrode, a hole auxiliary layer, a light emitting material layer, an electron auxiliary layer, and insulation layers with a refractive index lower than the light emitting material layer, where the insulation layers are used to enhance light efficiency and color purity by acting as optical compensation layers, increasing the color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional light emitting materials are used in electroluminescent display devices, then the device structure can be kept simple, but the color gamut remains narrow due to non-uniform lifetimes and efficiencies of red, green, and blue materials
Solution Approach 1:
The patent introduces an optical compensation layer as an intermediary component between the light emitting material layer and the electrode. This layer mediates the optical interaction by having a refractive index lower than the light emitting material, which compensates for the narrow color gamut issue without requiring changes to the light emitting materials themselves, thus maintaining device structure simplicity while improving color gamut
Solution Approach 2:
The patent changes the refractive index parameter of the optical compensation layer to be lower than that of the light emitting material layer. This parameter change enables improved light extraction efficiency and broader color gamut while keeping the overall device structure relatively simple, resolving the contradiction between structural simplicity and color performance
2Adaptability or versatility
If insulation layers with lower refractive index are added to improve color gamut, then light efficiency and color purity improve, but device structure becomes more complex
Solution Approach 1:
The optical compensation layer serves multiple functions simultaneously: it acts as an insulation layer, provides optical compensation to broaden color gamut, improves light extraction efficiency, and maintains electrical isolation. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device structure complexity while achieving improved color gamut
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 light efficiency and color purity, resulting in a wider color gamut and enhanced color representation, while maintaining hole and electron mobility.
Implementation Method 1
insulation layers between the hole auxiliary layer and the light emitting material layer and between the electron auxiliary layer and the light emitting material layer, wherein a refractive index of the insulation layers is smaller than a refractive index of the light emitting material layer
Data Source
AI summary
An electroluminescent display device includes a substrate; a first electrode on the substrate; a hole auxiliary layer on the first electrode; a light emitting material layer on the hole auxiliary layer; an electron auxiliary layer on the light emitting material layer; a second electrode on the electron auxiliary layer; and insulation layers between the hole auxiliary layer and the light emitting material layer and between the electron auxiliary layer and the light emitting material layer, wherein a refractive index of the insulation layers is smaller than a refractive index of the light emitting material layer.