Flexible Substrate Bonding Protrusions for Reliable Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The bonding process for electronic devices with flexible substrates requires high bonding pressure to ensure effective contact between conductive particles and bonding pads, which can lead to the collapse of the flexible substrate due to excessive pressure.
Innovation Solution
The use of protrusions on the bonding pad of the flexible substrate, with specific dimensions and insulation layers, increases the contact area and deformation of conductive particles, allowing for enhanced bonding stability while reducing the external force required for effective contact, thereby preventing substrate collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If greater bonding pressure is applied to ensure effective contact between conductive particles and bonding pad, then bonding reliability is improved, but the flexible substrate may collapse
Solution Approach 1:
The bonding pad surface is modified with protrusions that create localized contact points. These protrusions concentrate the bonding pressure at specific locations rather than distributing it uniformly, enabling effective conductive particle contact while reducing the overall pressure required and preventing substrate collapse
Solution Approach 2:
The bonding pad transitions from a flat two-dimensional surface to a three-dimensional structure with protrusions. This dimensional change increases the effective contact area with conductive particles while maintaining reduced bonding pressure, resolving the contradiction between bonding reliability and substrate integrity
2Reliability
If the contact area between conductive particles and bonding pad is increased to improve bonding stability, then bonding reliability is improved, but greater bonding pressure is required
Solution Approach 1:
Protrusions are formed at specific locations on the bonding pad to create localized contact points with conductive particles. This local quality enhancement provides reliable bonding at discrete points without requiring uniformly high pressure across the entire bonding interface
Solution Approach 2:
The protrusions are pre-formed on the bonding pad before the bonding process. This preliminary structural preparation ensures that when conductive particles are applied, they naturally contact the protrusions with minimal pressure, achieving stable bonding without requiring excessive bonding force
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 solution enhances bonding stability and maintains effective electrical connections by increasing the contact area between conductive particles and the flexible substrate, reducing the risk of substrate collapse and ensuring reliable contact even under environmental changes or long-term use.
Implementation Method 1
the conductive particles of the anisotropic conductive film deform effectively and be in contact with the conductive layer of the bonding pad
Data Source
AI summary
An electronic device includes a flexible substrate, an anisotropic conductive film, and an electronic element. The flexible substrate includes an active area, a bonding pad, and a plurality of protrusions located on the bonding pad. The anisotropic conductive film includes a plurality of conductive particles. The conductive particles are in contact with the protrusions. The anisotropic conductive film is located between the bonding pad of the flexible substrate and the electronic element.