OLED Display Dual Sealing Structure for Moisture Barrier
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Solution Overview
Problem
Existing organic light emitting diode (OLED) displays face challenges in preventing moisture and oxygen permeation, which can deteriorate their performance and lead to a limited lifespan due to insufficient sealing, and there is a need to improve the encapsulation method to enhance durability and production efficiency.
Innovation Solution
The OLED display employs a dual sealing system with a first sealing material between the display and encapsulation substrates, a second sealing material covering the external exposed surface, and a molding portion made of elastic materials like rubber or silicon to surround lateral surfaces and corners, ensuring a secure and moisture-resistant enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealing material is used between substrates, then the structure is simple, but moisture and oxygen permeation occurs leading to deteriorated performance
Solution Approach 1:
The sealing structure is divided into two distinct sealing materials: a first sealing material positioned between the display substrate and encapsulation substrate, and a second sealing material covering the external exposed surface of the first sealing material. This segmentation creates multiple barrier layers that collectively prevent moisture and oxygen permeation, resolving the contradiction between simple structure and reliable sealing.
Solution Approach 2:
The second sealing material is applied over the external exposed surface of the first sealing material, creating a nested configuration where one sealing layer protects the other. This nested arrangement ensures that even if one sealing layer has defects, the other provides protection, thereby improving reliability without requiring a completely separate sealing system.
2Productivity
If sealing material is injected without control, then the sealing process is fast, but spattering and flowing occur causing material waste
Solution Approach 1:
The first sealing material is applied and positioned between the substrates before the second sealing material is applied externally. This preliminary action creates a contained structure that guides the subsequent injection process, allowing rapid injection of the second sealing material without spattering or flowing, thus maintaining high productivity while preventing material waste.
Solution Approach 2:
The first sealing material acts as an intermediary structure that contains and directs the second sealing material during injection. This intermediary configuration ensures that the sealing material is injected precisely where needed without spattering onto surrounding areas, reducing material waste while maintaining efficient processing speed.
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 configuration effectively suppresses moisture and oxygen permeation, enhancing the lifespan of the OLED display and reducing material waste during manufacturing by preventing spattering and flowing of the sealing material during injection.
Implementation Method 1
The molding portion may be formed of a material having elastic force. The material having the elastic force may include any one selected from rubber, urethane, and silicon.
Data Source
AI summary
An organic light emitting diode display includes a display substrate including a display region having an organic light emitting diode; an encapsulation substrate facing the display substrate and covering the display region; a first sealing material between the display substrate and the encapsulation substrate, the first sealing material sealing the display region; a second sealing material in contact with an external exposed surface of the first sealing material and sealing the first sealing material; and a molding portion surrounding a lateral surface and an external corner of each of the display substrate and the encapsulation substrate and surrounding an external exposed surface of the second sealing material.