OLED Adhesive Layer Moisture Barrier Design
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face challenges in preventing moisture and oxygen penetration, which complicates the manufacturing process and affects the display's thickness and reliability, as existing encapsulation methods are cumbersome and not entirely effective.
Innovation Solution
A layered adhesive system comprising a filling adhesive layer and a hygroscopic adhesive layer, made from materials like silica gel, alumino-silicate beads, and thermally or photocurable resins, is applied between the substrate and encapsulation substrate to create a barrier against moisture and oxygen, enhancing the OLED's lifespan without increasing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation substrate is used or a protection layer is formed to prevent moisture or oxygen penetration, then the reliability of the OLED display is improved, but the device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent combines the encapsulation function and adhesive function into a single integrated adhesive layer. This layer simultaneously bonds the substrate to the encapsulation substrate and provides moisture/oxygen barrier protection through hygroscopic materials embedded within it, eliminating the need for separate encapsulation layers and reducing manufacturing steps
Solution Approach 2:
The adhesive layer is designed to perform multiple functions: mechanical bonding between substrates, moisture absorption, and oxygen barrier protection. By incorporating hygroscopic materials and filling materials into the adhesive composition, a single component achieves what previously required multiple separate layers
2Reliability
If an encapsulation substrate is used or a protection layer is formed to prevent moisture or oxygen penetration, then the reliability of the OLED display is improved, but the thickness of the display increases
Solution Approach 1:
The patent combines the encapsulation function and adhesive function into a single integrated adhesive layer. This layer simultaneously bonds the substrate to the encapsulation substrate and provides moisture/oxygen barrier protection through hygroscopic materials embedded within it, eliminating the need for separate encapsulation layers and reducing manufacturing steps
Solution Approach 2:
The adhesive layer is formulated as a thin film containing hygroscopic materials that provide effective barrier protection without requiring the thickness of traditional encapsulation substrates. The filling materials create a tortuous path for moisture and oxygen diffusion, achieving barrier functionality in a thin profile
3Reliability
If traditional encapsulation methods are used to protect the organic emission layer, then the reliability is improved, but the manufacturing process becomes more complex and yield decreases
Solution Approach 1:
The patent combines the encapsulation function and adhesive function into a single integrated adhesive layer. This layer simultaneously bonds the substrate to the encapsulation substrate and provides moisture/oxygen barrier protection through hygroscopic materials embedded within it, eliminating the need for separate encapsulation layers and reducing manufacturing steps
Solution Approach 2:
The adhesive layer contains hygroscopic materials that automatically absorb and trap moisture and oxygen that penetrate through the encapsulation substrate, providing self-healing protection without requiring additional active management or complex manufacturing processes
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 effectively blocks moisture and oxygen, improving the OLED's lifespan and manufacturing simplicity by forming a reliable barrier without the need for additional getter materials, thus enhancing the display's reliability and reducing manufacturing complexity.
Implementation Method 1
an adhesive layer which is intervened between the substrate and the encapsulation substrate and comprises a hygroscopic material that has a function of absorbing and trapping moisture or oxygen which has penetrated through the encapsulation substrate
Implementation Method 2
a filling adhesive layer which is covered by the hygroscopic adhesive layer and comprises a filling material having a function of blocking and trapping the moisture or oxygen
Data Source
AI summary
Disclosed is an organic light emitting diode (OLED) display comprising a substrate; an organic light emitting element disposed on the substrate; an encapsulation substrate disposed on the organic light emitting element; and an adhesive layer formed on the substrate, covering the organic light emitting element, and bonding the substrate on which the organic light emitting element is formed with the encapsulation substrate.