Flexible OLED Dative Bond Layer Adhesion
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Solution Overview
Problem
Flexible OLED displays are prone to moisture ingress and breakage during bending due to the peeling off of inorganic passivation layers, which have high water vapor transmission rates and lack sufficient adhesion to organic layers.
Innovation Solution
A manufacturing method for flexible OLED displays that includes forming an organic light emitting display layer on a flexible substrate, followed by a first inorganic layer, a dative bond layer with an electron-rich group, a polymer organic layer with an electron-deficient group forming a dative bond, and a second inorganic layer, enhancing adhesion and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic passivation layer is applied to block moisture, then water vapor transmission rate is reduced, but adhesion to organic layers deteriorates causing peeling during bending
Solution Approach 1:
The patent introduces an intermediate layer between the inorganic passivation layer and the organic layer. This intermediate layer acts as a mediator that provides both moisture blocking capability and sufficient adhesion to the organic layer, preventing peeling during bending while maintaining the moisture barrier function of the inorganic layer.
Solution Approach 2:
The patent employs a composite structure combining inorganic materials (for moisture blocking) with organic or hybrid materials (for adhesion). This composite approach allows the system to simultaneously achieve low water vapor transmission rate and strong interlayer bonding, resolving the contradiction between moisture protection and adhesion strength.
2Reliability
If a thick inorganic layer is used to ensure low transmittance, then moisture protection is improved, but flexibility and resistance to bending breakage deteriorate
Solution Approach 1:
The patent applies different material properties to different layers: the inorganic layer provides localized moisture blocking where needed, while the intermediate and organic layers provide flexibility and adhesion. This local differentiation of material qualities allows the structure to simultaneously achieve moisture protection and bending flexibility without requiring the entire structure to be thick and rigid.
Solution Approach 2:
The patent segments the passivation structure into multiple functional layers rather than using a single thick inorganic layer. This segmentation allows each layer to perform its specific function (moisture blocking, adhesion, flexibility) independently, maintaining moisture protection while improving overall flexibility and bend resistance.
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 method improves the adhesion between inorganic and organic layers, enhancing the reliability and durability of flexible OLED displays by forming a reinforcing dative bond, thereby preventing peeling during bending and moisture ingress.
Implementation Method 1
forming a first dative bond layer on the first inorganic layer, wherein the first dative bond layer is configured to provide an electron-rich group which is a π bond of a benzene ring; forming a polymer organic layer on the first dative bond layer, wherein the polymer organic layer has an electron-deficient group, the electron-deficient group and the electron-rich group commonly form a dative bond
Data Source
AI summary
A flexible organic light emitting diode display and a method for manufacturing the same are provided. The flexible organic light emitting diode display includes sequentially forming an organic light emitting display layer, a first inorganic layer, a first dative bond layer, a polymer organic layer, and a second inorganic layer on a flexible substrate; the first dative bond layer is configured to provide an electron-rich group; the polymer organic layer has an electron-deficient group, the electron-deficient group and the electron-rich group commonly form a dative bond.