Flexible Substrate Carrier with Patterned Release Layer
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Solution Overview
Problem
The challenge in manufacturing flexible display devices lies in the need for reliable substrate transfer and separation techniques, particularly in roll-to-roll fabrication processes, where issues arise from rolling and contact, and there is a requirement for a substrate with heat-resistance, low thermal expansion, and chemical stability to bond and release plastic substrates from glass without causing deformation.
Innovation Solution
A substrate structure comprising a carrier with a patterned release layer and a flexible substrate, where the release layer has a specific adhesion force relationship with the carrier and the flexible substrate, allowing for controlled attachment and detachment during TFT processing, ensuring the flexible substrate remains attached during processing and can be easily separated without peeling off, using materials like parylene or cyclic olefin copolymers for the release layer and polyimide or silicon dioxide for the flexible substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release layer with specific adhesion forces is introduced between the carrier and flexible substrate, then the flexible substrate can be reliably attached during processing and easily separated without deformation, but the structural complexity and manufacturing process complexity increase
Solution Approach 1:
A release layer is introduced as an intermediary component between the carrier and the flexible substrate. This release layer has specific adhesion characteristics: it adheres strongly to the carrier during processing but releases easily from the flexible substrate when needed. The release layer acts as a mediator that enables reliable attachment during manufacturing while facilitating clean separation afterward, preventing substrate deformation and contamination.
Solution Approach 2:
The adhesion force parameter of the release layer is carefully controlled and optimized. The release layer exhibits different adhesion strengths to different surfaces: strong adhesion to the carrier (first adhesion force) and weak adhesion to the flexible substrate (second adhesion force). This parameter differentiation enables the release layer to hold the substrate securely during processing while allowing easy release when required.
2Ease of manufacture
If the flexible substrate is directly bonded to the carrier without a release layer, then the manufacturing process is simpler, but the substrate cannot be easily separated without peeling or deformation
Solution Approach 1:
The release layer serves as a mediator that decouples the bonding simplicity from the separation difficulty. During manufacturing, the flexible substrate is bonded to the carrier through the release layer in a simple process. During separation, the release layer's weak adhesion to the substrate allows easy peeling without damaging the substrate, thus resolving the contradiction between simple manufacturing and easy separation.
Solution Approach 2:
The bonding interface is segmented into two distinct adhesion relationships: the release layer-carrier interface with strong adhesion and the release layer-substrate interface with weak adhesion. This segmentation allows the system to exhibit different bonding characteristics on different sides of the release layer, enabling both simple manufacturing and easy separation operations.
3Strength
If high adhesion force is used between the flexible substrate and carrier, then the substrate remains stable during processing, but the substrate cannot be easily released without causing damage
Solution Approach 1:
The release layer acts as a protective intermediary between the substrate and carrier. It provides strong adhesion to the carrier to ensure substrate stability during processing, while its weak adhesion to the substrate prevents damage during release. The release layer absorbs the mechanical stress of separation, preventing direct force application to the substrate that would cause peeling or deformation.
Solution Approach 2:
Different adhesion strengths are localized to different interfaces of the release layer. The release layer exhibits strong adhesion quality at the carrier interface and weak adhesion quality at the substrate interface. This local differentiation of adhesion properties allows the system to simultaneously achieve strong substrate fixation during processing and easy damage-free release when needed.
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 enhances the stability and heat dissipation of the substrate structure, reduces the risk of carrier deformation during high-temperature processes, and facilitates easy separation of the flexible substrate, improving the manufacturing process efficiency and reliability.
Implementation Method 1
a release layer with a first area formed on the carrier, which has a first adhesion force to the carrier; and a flexible substrate with a second area overlying part of the first area of the release layer and contacting the carrier, which has a second adhesion force to the release layer
Implementation Method 2
This approach enhances the stability and heat dissipation of the substrate structure, reduces the risk of carrier deformation during high-temperature processes
Data Source
AI summary
A substrate structure applied in flexible devices is provided. The substrate structure includes a carrier; a release layer with a first area formed on the carrier, which has a first adhesion force to the carrier; and a flexible substrate with a second area overlying part of the first area of the release layer and contacting the carrier, which has a second adhesion force to the release layer and a third adhesion force to the carrier, wherein the first area is larger than or equal to the second area, the third adhesion force is greater than the first adhesion force, and the first adhesion force is greater than the second adhesion force.