Anisotropic Conductive Film Layout for Tilt-Free Pad Connection
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Solution Overview
Problem
Existing anisotropic conductive films (ACF) face issues with non-uniform distribution of conductive particles, leading to open circuits due to insufficient particles connecting small pads and uneven force distribution causing component tilt, resulting in quality problems.
Innovation Solution
The anisotropic conductive structure employs a specific arrangement of small and large conductive particles, where small particles are aligned with electrical connection portions and large particles are outside, balancing height differences and ensuring even force application, thus preventing open circuits and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles are distributed in the adhesive layer, then electrical connection is achieved, but non-uniform distribution causes open circuits for small pads
Solution Approach 1:
The patent applies local quality by creating different particle density zones within the adhesive layer. The first region has a higher concentration of conductive particles to ensure reliable electrical connection for small pads, while the second region has lower particle concentration. This non-uniform local distribution resolves the contradiction by providing sufficient particles where needed (improving reliability) while maintaining overall structure integrity (managing manufacturing precision constraints).
Solution Approach 2:
The adhesive layer is segmented into multiple regions with different particle concentrations. The first region corresponds to the projection area of the pad and contains more conductive particles, while the second region contains fewer particles. This segmentation allows the structure to address the reliability issue for small pads without requiring uniform high-density particles throughout the entire adhesive layer, thus resolving the technical contradiction.
2Reliability
If pressure is applied to squeeze conductive particles for electrical connection, then electrical conduction is achieved, but uneven force distribution causes component tilt
Solution Approach 1:
The patent implements local quality by concentrating conductive particles in the first region that corresponds to the pad projection area. This localized particle concentration ensures that pressure is effectively transmitted to create electrical connection only where needed (improving reliability) while preventing excessive or uneven force distribution across the entire component (maintaining alignment stability).
Solution Approach 2:
The adhesive layer acts as an intermediary between the applied pressure and the conductive particles. By designing the adhesive layer with region-specific particle concentrations, it mediates the pressure distribution to ensure adequate force for electrical connection in the first region while preventing excessive force that would cause component tilt, thus resolving the contradiction between connection reliability and alignment stability.
3Reliability
If conductive particles are placed outside pads, then electrical connection is achieved, but gaps cause component inclination under pressure
Solution Approach 1:
The patent applies local quality by restricting conductive particles primarily to the first region corresponding to the pad projection area, with fewer particles in the second region outside the pad. This localized particle placement achieves reliable electrical connection where needed while minimizing the complexity of force distribution management, as particles outside the pad area are reduced to prevent unwanted mechanical interactions that would complicate the force distribution system.
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 arrangement ensures stable electrical connections by evenly distributing force across components, preventing tilt and ensuring reliable electrical contact without short circuits.
Implementation Method 1
the pads of the components are electrically conducted to each other by the conductive particles
Data Source
AI summary
An anisotropic conductive structure includes a first element, a second element, and an anisotropic conductive film (ACF) arranged between the first element and the second element. The anisotropic conductive structure can balance the height difference caused by the electrical connection portion, which can prevent tilt and open circuit. A lens module and an electronic device carrying the lens module are also provided.