OLED Transparency via Low Refractive Index Intermediary Layer
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Solution Overview
Problem
Conventional transparent organic light-emitting diodes (OLEDs) have limited optical transparency due to the refractive index of the adhesive used in their lamination, which restricts their optical performance.
Innovation Solution
Incorporating a layer structure with a refractive index less than the cover glass, potentially including fluorine-containing polymers or aerogel, to increase transparency without significantly increasing the component's thickness, and using a low refractive index adhesive or intermediate layer to further enhance optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional adhesive with refractive index of approximately 1.55 is used for lamination of the cover glass, then the component can be assembled and protected, but the optical transparency of the light-emitting component is limited
Solution Approach 1:
The patent introduces an intermediate layer with refractive index n3 between the cover glass (n1≈1.55) and the adhesive layer (n2≈1.55). This intermediate layer has a lower refractive index (n3<1.55) that creates a gradual transition, reducing the refractive index mismatch and minimizing light reflection at interfaces, thereby enhancing optical transparency without complicating the assembly process
Solution Approach 2:
The patent changes the refractive index parameter of the layer structure by selecting materials with specific refractive indices. The intermediate layer is designed with refractive index n3 < 1.55 (lower than both the cover glass and adhesive), creating an optimized optical path that reduces reflection losses and improves overall transparency of the light-emitting component
2Illumination intensity
If the refractive index of the layer structure is reduced to increase transparency, then optical performance is improved, but the component thickness may increase
Solution Approach 1:
The patent applies local quality by making the intermediate layer optically active rather than uniformly thick throughout. The intermediate layer with refractive index n3<1.55 is positioned specifically at the critical interface between cover glass and adhesive, where it most effectively reduces reflection. This localized optical optimization improves transmission without requiring the entire component to be thinner
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 solution significantly increases the optical transparency of the light-emitting component by reducing the refractive index of the layer structure, achieving higher transmission values across various wavelengths without increasing the overall thickness, thus improving the component's optical performance.
Implementation Method 1
the at least one layer has a refractive index which is less than the refractive index of the cover
Data Source
AI summary
A light-emitting component may include: an electrically active region, including a first electrode, a second electrode, an organic functional layer structure between the first electrode and the second electrode, a cover arranged above the electrically active region, and a layer structure arranged between the cover and the electrically active region. The component may have at least one layer having a refractive index which is less than the refractive index of the cover.