Organic EL Panel Light Extraction via Localized Film Thickness
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Solution Overview
Problem
The manufacturing process of organic EL panels is complicated due to the need to adjust the film thickness of transparent conductive layers for each R, G, and B color, which affects light-extraction efficiency.
Innovation Solution
An organic EL panel design where the first electrode reflects light, the second electrode transmits light, and the organic light-emitting layer is sandwiched between them, with charge injection/transport layers and other layers optimized in film thickness to enhance light interference and extraction efficiency, simplifying the manufacturing process by using the same material for functional layers across colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the film thickness of transparent conductive layer is adjusted for each R, G, and B color to increase light-extraction efficiency, then light-extraction efficiency is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the film thickness of the first functional layer (charge injection/transport layer) for each color (R, G, B) to optimize light-extraction efficiency for each wavelength, while keeping other layers uniform. This localized optimization resolves the contradiction by achieving color-specific performance improvement without requiring all layers to be customized for each color.
Solution Approach 2:
The patent changes the physical parameter (film thickness) of the first functional layer to optimize optical interference effects for different colors. By adjusting this specific parameter locally for each color while maintaining uniformity in other layers, the patent achieves improved light-extraction efficiency without proportionally increasing manufacturing complexity.
2Loss of energy
If the film thickness of transparent conductive layer is adjusted for each R, G, and B color to increase light-extraction efficiency, then light-extraction efficiency is improved, but the number of manufacturing steps increases
Solution Approach 1:
The patent applies local quality by differentiating the film thickness of the first functional layer (charge injection/transport layer) for each color (R, G, B) to optimize light-extraction efficiency for each wavelength, while keeping other layers uniform. This localized optimization resolves the contradiction by achieving color-specific performance improvement without requiring all layers to be customized for each color.
Solution Approach 2:
The patent changes the physical parameter (film thickness) of the first functional layer to optimize optical interference effects for different colors. By adjusting this specific parameter locally for each color while maintaining uniformity in other layers, the patent achieves improved light-extraction efficiency without proportionally increasing manufacturing complexity.
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 design increases light-extraction efficiency while simplifying the manufacturing process by allowing for separate film thickness adjustments for each color without the need for complex layer-by-layer adjustments, specifically improving the B color's efficiency and maintaining chromaticity correction.
Implementation Method 1
a first electrode of each of R (red), G (green), and B (blue) colors that reflects incident light
Implementation Method 2
an organic light-emitting layer of each of the R, G, and B colors that is disposed between the first electrode of a corresponding color and the second electrode, and emits light of a corresponding color due to voltage application between the first electrode of the corresponding color and the second electrode
Implementation Method 3
the present invention aims to provide an organic EL panel, a display with use of the organic EL panel, and a method of manufacturing the organic EL panel according to which light-extraction efficiency is increased due to light interference phenomenon
Data Source
AI summary
To increase light-extraction efficiency and simplify manufacturing process. An organic EL panel includes: first electrode reflecting incident light; second electrode transmitting incident light therethrough; organic light-emitting layer emitting light of corresponding color among R, G, and B colors; first functional layer including charge injection/transport layer and at least one other layer, and disposed between the first electrode and the light-emitting layer; and second functional layer disposed between the second electrode and the light-emitting layer. The charge injection/transport layers of R, G, and B colors differ in film thickness, the at least one other layers of R, G, and B colors are equal in film thickness to one another, the second functional layers of R, G, and B colors are equal in film thickness to one another, and the light-emitting layers of R and G colors are equal in film thickness, and differ in film thickness from the light-emitting layer of B color.