OLED Display Adhesive Encapsulation for Moisture and Oxygen Protection
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Solution Overview
Problem
The organic light emitting diode (OLED) display is sensitive to moisture and oxygen, leading to potential degradation, and existing encapsulation methods complicate manufacturing and hinder the achievement of a thin thickness.
Innovation Solution
An adhesive layer composed of sequentially layered first filling, hygroscopic, and second filling layers, incorporating hygroscopic materials like silica gel and filling materials like talc, is used to protect the OLED from moisture and oxygen, simplifying the manufacturing process.
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 quality and reliability of the OLED display is improved, but the manufacturing process becomes complicated and the thickness increases
Solution Approach 1:
The patent combines the encapsulation function and adhesive function into a single integrated layer. The encapsulation layer is formulated to include both protective properties against moisture/oxygen and adhesive properties to bond the flexible substrate to the rigid substrate, eliminating the need for separate encapsulation and adhesive layers.
Solution Approach 2:
The encapsulation layer is designed to perform multiple functions simultaneously: it provides barrier protection against moisture and oxygen, serves as an adhesive to bond substrates, and maintains structural integrity. This multi-functional design simplifies the overall device structure and manufacturing process.
2Reliability
If an encapsulation substrate is used or a protection layer is formed to prevent moisture or oxygen penetration, then the quality and reliability of the OLED display is improved, but the thickness of the display increases
Solution Approach 1:
The patent employs a thin-film encapsulation layer that provides effective protection against moisture and oxygen while maintaining a minimal thickness. The encapsulation layer is formulated as a thin film that can be deposited directly onto the OLED structure, avoiding the need for thick rigid encapsulation substrates.
3Reliability
If conventional encapsulation methods are used to protect the organic emission layer, then moisture or oxygen penetration is prevented, but the manufacturing process becomes complicated
Solution Approach 1:
The patent combines the encapsulation function and adhesive function into a single integrated layer. The encapsulation layer is formulated to include both protective properties against moisture/oxygen and adhesive properties to bond the flexible substrate to the rigid substrate, eliminating the need for separate encapsulation and adhesive layers.
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 adhesive layer effectively blocks moisture and oxygen penetration, enhancing the OLED's lifespan and reliability while allowing for a simpler manufacturing process.
Implementation Method 1
a hygroscopic adhesive layer comprising a hygroscopic material and a resin, the hygroscopic material having a specific gravity of 0.9 g/cm3 or less
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.