Flexible Display Package Structure for Water Vapor Sealing
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Solution Overview
Problem
Conventional package structures for flexible display devices are insufficient in providing reliable protection and airtightness due to the sensitivity of organic soft substrates and ultra-thin metal substrates to water vapor, leading to potential damage and reduced reliability.
Innovation Solution
A package structure incorporating a flexible opto-electronic display panel with a first and second barrier layer, along with an encapsulation layer, to provide enhanced protection and sealing effects, utilizing a composite structure of inorganic and organic materials to maintain flexibility and prevent water vapor ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one encapsulation layer is used to isolate the flexible display device from water vapor, then the device structure remains simple, but the sealing and protection effects are insufficient
Solution Approach 1:
The encapsulation layer is divided into multiple segments (first encapsulation layer and second encapsulation layer) that are disposed at different positions. The first encapsulation layer is disposed on the first surface of the backplane, while the second encapsulation layer is disposed on the second surface of the backplane, creating a multi-layer protective structure that significantly enhances sealing effectiveness against water vapor ingress
Solution Approach 2:
The package structure employs a nested configuration where the first and second encapsulation layers are positioned on opposite surfaces of the backplane, creating a sandwich-like protective structure. This nested arrangement ensures that water vapor must penetrate through multiple layers to reach the sensitive components, thereby improving reliability without excessive complexity
2Adaptability or versatility
If flexible substrates are used to maintain flexibility, then the device remains bendable, but the substrates become highly sensitive to water vapor and prone to damage
Solution Approach 1:
The patent employs flexible encapsulation layers that conform to the bendable nature of the display device. These thin film encapsulation layers are disposed on both surfaces of the backplane, providing a protective barrier against water vapor while maintaining the overall flexibility of the device. The encapsulation layers are designed to be thin yet effective, allowing the device to bend without compromising protection
Solution Approach 2:
The package structure utilizes composite material construction by combining flexible substrate materials with protective encapsulation layers. The first and second encapsulation layers work synergistically with the flexible backplane and frontplane to create a composite structure that simultaneously provides flexibility and resistance to water vapor, solving the contradiction between adaptability and harmful factor resistance
Data Source
AI summary
A package structure of flexible display device includes a flexible opto-electronic display panel, a first barrier layer and a second barrier layer. The flexible opto-electronic display panel includes a backplane, a flexible frontplane, and a display media layer. The display media layer is disposed between the flexible frontplane and the backplane, where the display media layer is substantially corresponding to a display region of the backplane, and at least one side of the display media layer aligns with one corresponding side of the backplane. The first barrier layer is disposed on a first surface of the flexible frontplane, where the flexible frontplane, the display media layer and the first barrier layer expose a bonding region of the backplane. The second barrier layer is disposed on a second surface of the backplane.