Filler-Aligned Connection Film for Reliable Fine-Bump Bonding
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Solution Overview
Problem
Anisotropic conductive films face challenges in reliably trapping conductive particles on minimized bumps due to resin flow issues, leading to potential dislodgment of conductive particles during the manufacturing process, especially as bump sizes decrease.
Innovation Solution
A method involving a filler-containing film with a filler-aligned layer, where individual conductive particles are aligned in a binder resin layer, involves a temporary fixing step to sandwich the filler between components and a final compression bonding step to secure the particles, minimizing resin flow and ensuring reliable trapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles are uniformly or regularly arranged in a matrix to maintain particle trapping properties on minimized bumps, then the particle trapping capability is improved, but the adhesive component flows during heating and pressurizing causing conductive particles to flow out and fail to be trapped
Solution Approach 1:
The conductive particles are pre-aligned in a linear pattern within the adhesive layer before the bonding process. This preliminary arrangement ensures that particles are positioned optimally to be trapped between minimized bumps, preventing particle trapping failures even when bumps are small
Solution Approach 2:
The patent changes the spatial distribution parameter of conductive particles from uniform/random arrangement to linear alignment. This parameter change allows particles to be more effectively trapped by minimized bumps while reducing the negative impact of resin flow during heating and pressurizing
2Productivity
If bump size is minimized to increase wiring density in small electronic devices, then the wiring density is improved, but the number of conductive particles that can be trapped is reduced leading to unreliable conduction
Solution Approach 1:
Conductive particles are pre-aligned in linear patterns within the adhesive layer before bonding. This preliminary arrangement ensures that even when bump sizes are minimized for high wiring density, there are sufficient particles positioned correctly to be trapped and establish reliable conduction paths
Solution Approach 2:
The patent creates local concentration of conductive particles along linear paths where bumps will make contact. This local quality enhancement ensures that minimized bumps can still trap enough particles for reliable conduction, maintaining conduction reliability while achieving high wiring density
Data Source
AI summary
A method for manufacturing a connection body, and a method for connecting a component, which can secure conduction reliability by trapping conductive particles even when the bump size is minimized. The method includes a disposing step of disposing a filler-containing film having a filler-aligned layer in which individual independent fillers are aligned in a binder resin layer between a first component having a first electrode and a second component having a second electrode; a temporary fixing step of pressing the first component or the second component to sandwich the filler-aligned layer; and a final compression boding step of further pressing the first component or the second component after the temporary fixing step to connect the first electrode and the second electrode.