Adhesive Film for Flexible OLED Pixel Separation
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Solution Overview
Problem
Flexible organic electroluminescent display devices face failures due to peeling off of the organic film or lower electrode from the pixel separation film when the substrate is bent, causing stress at the periphery of the pixel separation film.
Innovation Solution
An organic electroluminescent display device configuration that includes a substrate with a matrix of pixels, an under layer with an organic insulating film and lower electrodes, a pixel separation film that projects to cover the outer edge of the lower electrode, and an organic layer with a first adhesive film made of amorphous carbon, diamond-like carbon, silicon, gallium, germanium, graphite oxide, or silicon carbide formed between the under layer and the pixel separation film or between the pixel separation film and the organic layer to enhance adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used to enable bending, then adaptability is improved, but reliability deteriorates due to peeling off of layers at the periphery of the pixel separation film
Solution Approach 1:
An adhesive film is introduced as an intermediary layer between the pixel separation film and adjacent layers (organic film or lower electrode). This adhesive film specifically at the periphery of the pixel separation film prevents peeling off when bending stress is applied, while maintaining the flexibility of the display device.
Solution Approach 2:
The adhesive film is applied locally at the periphery of the pixel separation film where bending stress concentrates, rather than uniformly across the entire structure. This localized application prevents peeling at critical stress points while maintaining overall device flexibility.
2Length of moving object
If the pixel separation film is made thinner for miniaturization, then device size is reduced, but strength deteriorates making it more susceptible to peeling
Solution Approach 1:
The adhesive film serves as a mediator that compensates for the reduced strength of thinner pixel separation films. By providing enhanced adhesion at the interface, the adhesive film allows the pixel separation film to be made thinner without compromising peeling resistance.
Solution Approach 2:
The structure combines the pixel separation film with an adhesive film to create a composite structure. This composite provides both the miniaturization benefits of a thin pixel separation film and the strength benefits of the adhesive film's bonding properties.
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 enhanced adhesiveness between the pixel separation film and adjacent layers prevents peeling off, ensuring the reliability and miniaturization of the display device, even when stress is applied due to bending, and maintains the integrity of the light-emitting area.
Implementation Method 1
a first adhesive film formed of one or more kinds of substances selected from the group consisting of amorphous carbon, diamond-like carbon, silicon, gallium, germanium, graphite oxide, and silicon carbide is formed at least partially between the top of the under layer and the pixel separation film or between the pixel separation film and the organic layer
Data Source
AI summary
An organic electroluminescent display device of the invention includes a substrate on which a plurality of pixels are disposed in a matrix, an under layer that includes an organic insulating film and lower electrodes, a pixel separation film that is provided on the under layer so as to project therefrom, and an organic layer that covers the top of the under layer and the top of the pixel separation film and includes at least a light-emitting layer. A first adhesive film formed of one or more kinds of substances selected from the group consisting of amorphous carbon, diamond-like carbon, silicon, gallium, germanium, graphite oxide, and silicon carbide is formed at least partially between the top of the under layer and the pixel separation film or between the pixel separation film and the organic layer.