Flexible Device Packaging with Anisotropic Conductive Film
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Solution Overview
Problem
Flexible electronic devices face challenges in maintaining mechanical strength and waterproof properties, especially when subjected to bending and high-temperature semiconductor manufacturing processes, due to insufficient adhesion between substrates and coating layers.
Innovation Solution
A flexible device is packaged using an anisotropic conductive film that electrically and physically connects the electronic device to a flexible substrate, with a silicon-on-insulator circuit board and a protection layer to ensure flexibility and mechanical durability, while maintaining waterproof properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used to maintain flexibility, then the device can bend, but the substrate cannot easily endure high-temperature semiconductor manufacturing processes
Solution Approach 1:
The patent divides the substrate system into multiple layers: a flexible substrate for bending capability, a support substrate for temperature tolerance during manufacturing, and a release layer to separate them. This segmentation allows each layer to perform its specific function without compromise.
Solution Approach 2:
The release layer acts as an intermediary between the flexible substrate and support substrate. It enables the flexible substrate to be processed at high temperatures on the support substrate, then released and bonded to the electronic device after manufacturing, mediating between the conflicting temperature and flexibility requirements.
2Strength
If adhesive force is increased to prevent separation during bending, then the substrate and coating layer remain bonded, but the device complexity increases
Solution Approach 1:
The anisotropic conductive film serves as an intermediary bonding layer between the flexible substrate and electronic device. It provides both mechanical adhesion to prevent separation during bending and electrical connectivity, eliminating the need for separate adhesive and conductive layers, thus reducing overall device complexity while maintaining sufficient adhesive force.
Solution Approach 2:
The anisotropic conductive film performs multiple functions simultaneously: it provides adhesive bonding to prevent separation during bending, establishes electrical connectivity between components, and maintains flexibility. This multi-functionality reduces the number of separate layers needed, simplifying the packaging structure.
3Reliability
If a coating layer is applied to ensure waterproof property, then the device is protected in fluidic environment, but the adhesion between coating layer and substrate becomes insufficient during bending
Solution Approach 1:
The anisotropic conductive film acts as an intermediary bonding layer between the flexible substrate and the coating layer. It provides sufficient adhesion strength to prevent separation during bending while allowing the coating layer to maintain its waterproof properties in fluidic environments.
Solution Approach 2:
The patent uses a composite structure combining the flexible substrate, anisotropic conductive film, and coating layer. This composite material system integrates the flexibility of the substrate, the adhesive properties of the conductive film, and the waterproof characteristics of the coating layer, achieving both waterproofing and adhesion during bending.
4Adaptability or versatility
If the circuit board thickness is reduced to maintain flexibility, then the device can bend, but the mechanical strength decreases
Solution Approach 1:
The patent segments the mechanical support function from the flexibility function. The thin circuit board provides flexibility for bending, while the support substrate and packaging structure provide the necessary mechanical strength and protection, allowing each component to optimize its specific role.
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
The solution effectively transmits electric signals, protects against mechanical stress, and maintains flexibility and waterproof properties, even when the device is bent, ensuring reliable operation in fluidic environments.
Implementation Method 1
an anisotropic conductive film is provided between the electronic device and the flexible substrate
Data Source
AI summary
Provided is a flexible device, which includes a flexible substrate, a plurality of electrode lines provided on the flexible substrate and configured to contact the following anisotropic conductive film and then extend to a side of the flexible substrate, an anisotropic conductive film configured to contact the electrode line and laminated on the flexible substrate, a plurality of bumps provided on the anisotropic conductive film, and a circuit board having an electronic device provided at one side thereof and configured to contact the plurality of bumps.