Anisotropic Conductive Film with Dual-Layer Filler Exposure
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Solution Overview
Problem
Anisotropic conductive films face challenges in achieving high-density mounting of electronic components while preventing short circuits and maintaining tackiness for reliable connections.
Innovation Solution
A filler-containing film with a first filler layer and a second filler layer at different depths, where the first filler layer is exposed on one surface and the second filler layer is exposed on the other, allowing for increased filler density and improved connection reliability and tackiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number density of conductive particles is increased to support high mounting density, then the ability to support high density mounting is improved, but short circuits easily occur in the connection structure
Solution Approach 1:
The conductive particles are segmented into two separate layers (first conductive particle layer at first depth, second conductive particle layer at second depth) rather than being mixed in a single layer. This segmentation allows the overall number density to be increased while maintaining adequate spacing within each layer, thus supporting high mounting density while reducing short circuit occurrence.
2Reliability
If conductive particles are disposed in a single layer to enable regular arrangement, then the ease of occurrence of short circuits is reduced, but there are limits to the ability to precisely arrange the conductive particles for high density mounting
Solution Approach 1:
The solution transitions from a two-dimensional single-layer arrangement to a three-dimensional multi-layer structure by disposing conductive particles at different depths (first depth and second depth) within the insulating resin layer. This dimensional change allows precise arrangement in each layer while increasing the overall number density, thereby supporting high density mounting without increasing short circuit risk.
3Stability of the object's composition
If a curable resin is used and cured to retain conductive particles in the resin layers, then the conductive particles are retained in the resin layers, but the tackiness of the surface decreases and operability decreases for temporary bonding
Solution Approach 1:
The resin composition is made non-uniform by adding a wax component that creates local differences in melting behavior. The wax melts at a lower temperature than the resin's curing temperature, creating a localized soft layer on the surface that provides tackiness for bonding, while the bulk resin remains cured to retain conductive particles.
Data Source
AI summary
An anisotropic conductive film or other filler-containing film 10A of the present invention includes a filler dispersed-layer 3 including a resin layer 2, a first filler layer with a filler 1A dispersed in a single layer in the resin layer 2, and a second filler layer with a filler 1B dispersed in a single layer in the resin layer 2 at a depth different from the depth of the first filler layer. The filler 1A of the first filler layer is exposed from one surface 2a of the resin layer 2, or is in close proximity to the surface 2a, and the filler 1B of the second filler layer is exposed from the other surface 2b of the resin layer 2, or is in close proximity to the surface 2b.