Flexible Device Substrate via Debonding Layer and Metal Oxide Adhesive
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Solution Overview
Problem
The limitation of using glass substrates without flexibility in display device manufacturing restricts the versatility and application of display devices, as they cannot be easily curved or bent, necessitating the development of a method to create a flexible device substrate.
Innovation Solution
A method involving the formation of a debonding layer with a silane compound and an inorganic adhesive layer using metal oxide materials like Al2O3 and AlZnO on a carrier substrate, allowing for the separation and flexibility of a process substrate, which is then used to manufacture a display device with enhanced hydrophobic and hydrophilic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a glass substrate is used for manufacturing display devices, then the structural strength and stability are improved, but the flexibility and adaptability of the display device are worsened
Solution Approach 1:
The patent replaces the rigid glass substrate with a flexible polymer substrate (such as polyimide, PET, or PEN) that can be bent and curved. This flexible substrate supports the entire display structure while enabling the device to achieve various shapes and form factors, directly resolving the contradiction between structural strength and flexibility.
Solution Approach 2:
The patent changes the fundamental material parameter of the substrate from inorganic glass to organic polymer materials. This material substitution fundamentally alters the mechanical properties, transitioning from rigid and brittle to flexible and ductile, thereby enabling both structural integrity and flexibility simultaneously.
2Adaptability or versatility
If a flexible polymer substrate is used instead of glass, then the flexibility and adaptability are improved, but the manufacturing precision and reliability during separation processes are worsened
Solution Approach 1:
The patent applies a release coating layer on the flexible substrate before manufacturing processes. This preliminary action creates a controlled interface that prevents unwanted adhesion during processing and enables clean separation at predetermined locations, thereby maintaining manufacturing precision while using flexible substrates.
Solution Approach 2:
The patent introduces a release coating layer as an intermediary between the flexible substrate and other components or processing tools. This intermediary layer controls adhesion properties, allowing precise separation when needed while maintaining flexibility, thus resolving the contradiction between flexibility and separation precision.
3Strength
If adhesive layers are used to attach components to the flexible substrate, then the bonding strength is improved, but the flexibility and bendability of the device are worsened
Solution Approach 1:
The patent uses thin-film adhesive layers deposited directly on the flexible substrate. These thin films provide sufficient bonding strength for component attachment while maintaining the overall flexibility of the device structure, as the thin adhesive layer does not significantly restrict bending or deformation of the flexible substrate.
Solution Approach 2:
The patent creates a composite structure combining the flexible substrate with thin adhesive layers and functional components. This composite design distributes mechanical stress across multiple layers, allowing the adhesive to provide bonding strength while the flexible substrate maintains overall device flexibility and bendability.
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 approach enables the production of flexible display devices with reduced damage during separation and minimizes bubble defects, offering improved flexibility and stability in the manufacturing process.
Implementation Method 1
The debonding layer may be formed by forming a silane compound layer including a self-assembled monolayer on the carrier substrate
Implementation Method 2
The inorganic adhesive layer may be formed by depositing the metal oxide material on the debonding layer
Data Source
AI summary
A device substrate manufacturing method includes forming a debonding layer on a carrier substrate. An inorganic adhesive layer is formed on at least a portion of the debonding layer. A process substrate is formed on the carrier substrate. A device is formed on the process substrate, and the process substrate is separated from the carrier substrate.