Debonding Flexible Substrates Using Vacuum Chuck and Ultrasonic Cutting
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Solution Overview
Problem
The proliferation of flexible displays and electronics is hindered by the challenge of securely bonding and subsequently debonding flexible substrates from rigid carriers without damaging the circuitry or the substrates, and existing bonding technologies are not scalable for high-resolution semiconductor processes.
Innovation Solution
A method and apparatus involving a vacuum-operated chuck, a debonder with adjustable cutting edges, and a system that includes ultrasonic vibration, solvent application, and temperature control to safely separate flexible substrates from rigid carriers, allowing for the reuse of the rigid carriers and efficient removal of residual adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If bonding technologies are used to secure flexible substrates to rigid carriers, then the substrates can be fixed in a fixed orientation during processing, but the subsequent debonding becomes challenging and may damage the fabricated circuitry or the flexible substrate itself
Solution Approach 1:
The patent introduces a sacrificial adhesive layer as an intermediary between the flexible substrate and rigid carrier. This adhesive is specifically designed to be weaker than both the substrate and carrier materials, allowing it to fail preferentially during debonding. The sacrificial adhesive absorbs the bonding function during processing while enabling damage-free separation afterward, as the adhesive layer cleanly detaches from both surfaces.
Solution Approach 2:
The patent employs parameter changes by selecting an adhesive material with specific mechanical properties (lower strength, controlled adhesion characteristics) that differ from the substrate and carrier materials. By changing the material parameters of the bonding layer, the system achieves both stable bonding during processing and easy, damage-free debonding afterward. The adhesive's parameter profile is optimized to be stronger than the interface it bonds but weaker than the materials being bonded.
2Productivity
If roll-to-roll processing is used for flexible substrates, then scalability is improved, but the practical application to high resolution semiconductor-like processes has not been demonstrated on a significant scale
Solution Approach 1:
The patent uses a rigid carrier as a copy or template of the traditional semiconductor manufacturing platform. By bonding the flexible substrate to this rigid carrier, the system replicates the stable, precision-friendly environment of rigid semiconductor processing while working with flexible materials. This allows high-resolution semiconductor-like processes to be performed on flexible substrates using established rigid carrier tooling and techniques.
Solution Approach 2:
The patent segments the manufacturing process into distinct phases: bonding the flexible substrate to a rigid carrier for high-precision processing, performing the semiconductor-like fabrication, and then debonding for flexible application. This segmentation allows each phase to be optimized independently - the rigid carrier phase for precision and the flexible substrate phase for scalability and application flexibility.
3Stability of the object's composition
If framing is used to secure flexible substrates, then the substrates can be held in place, but it requires much equipment and process modifications to become a viable option at large scale
Solution Approach 1:
The patent extracts the positioning and stabilization function from complex framing systems and consolidates it into a simple bonding interface between the flexible substrate and rigid carrier. The rigid carrier itself provides the structural support and positioning stability that would otherwise require elaborate framing equipment. This extraction eliminates the need for specialized framing equipment and process modifications while maintaining substrate stability throughout processing.
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
Enables the safe and efficient debonding of flexible substrates from rigid carriers, facilitating the scalability of flexible electronics manufacturing while allowing for the reuse of rigid carriers and effective removal of residual adhesive, thus addressing the limitations of existing bonding technologies.
Implementation Method 1
a vacuum operated chuck attached to the X-stage, wherein the vacuum operated chuck is capable of receiving a submounted substrate
Implementation Method 2
a vibration system communicatively coupled to the user interface, wherein the vibration system is operable to vibrate a debonder at ultrasonic frequencies
Implementation Method 3
a temperature control system communicatively coupled to the user interface, wherein the temperature control system is operable to heat the debonding system's cutting edge and/or vacuum operated chuck prior to debonding
Data Source
AI summary
The present invention provides a debonding apparatus, a system comprising such apparatus, and methods for using such apparatus or system for the removal of flexible substrates (14) post-processing without damage to fabricated devices.