Anisotropic Conductive Film Particle Placement to Prevent Short Circuits
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Solution Overview
Problem
Anisotropic conductive films used in display panels often experience short circuits due to conductive particles shifting during the bonding process, leading to product failures and reduced reliability.
Innovation Solution
A manufacturing method and apparatus that aligns and embeds conductive particles into a resin layer using a magnetic pressing head with controllable magnetic coils, ensuring precise placement and maintaining a distance from metal contacts to prevent short circuits, while heating and cooling the resin to secure the particles in position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressing methods are used to bond substrates via anisotropic conductive film, then bonding is achieved, but conductive particles shift and cause short circuits between adjacent contacts
Solution Approach 1:
The patent applies preliminary action by pre-positioning conductive particles onto the first substrate at locations corresponding to metal contacts before the bonding process. This preliminary placement ensures particles are already in correct positions, preventing short circuits during subsequent pressing operations
Solution Approach 2:
The patent segments the bonding process into distinct steps: first positioning particles on the first substrate, then bonding the second substrate. This segmentation allows precise particle placement to be completed before the bonding pressure is applied, preventing particle displacement and short circuits
2Reliability
If conductive particles are densely distributed to ensure conductivity, then electrical connection is improved, but the risk of short circuits between adjacent contacts increases
Solution Approach 1:
The patent applies local quality by concentrating conductive particles only at specific locations corresponding to metal contacts on the substrate, rather than uniform distribution. This localized placement ensures electrical conduction where needed while minimizing the risk of particles bridging adjacent contacts and causing short circuits
3Strength
If pressing force is increased to improve bonding strength, then substrate bonding is enhanced, but conductive particles are more likely to shift and cause short circuits
Solution Approach 1:
The patent performs the particle positioning action before applying bonding pressure. By pre-placing particles on the first substrate at locations corresponding to metal contacts, the particles are secured in position before the second substrate is pressed onto them, preventing particle shift even under increased 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 approach effectively reduces the occurrence of short circuits between contacts, enhancing the yield and reliability of anisotropic conductive films by ensuring conductive particles remain accurately positioned and embedded within the resin layer.
Implementation Method 1
providing a magnetic pressing head having a suction pattern arranged corresponding to the plurality of metal contacts, wherein the magnetic pressing head has a plurality of controllable magnetic coils arranged corresponding to the suction pattern
Implementation Method 2
sucking a plurality of conductive particles by the pressing head
Implementation Method 3
heating the resin layer by the pressing head to melt the resin layer, thereby embedding the plurality of conductive particles into the resin layer
Implementation Method 4
cooling the pressing head to cure the resin layer
Data Source
AI summary
A manufacturing method of an anisotropic conductive film and an apparatus thereof are provided. The manufacturing method of an anisotropic conductive film includes steps of: (a) providing a first substrate having metal contacts; (b) disposing a resin layer on the first substrate and covering the metal contacts; (c) providing a press head having a suction pattern arranged corresponding to the metal contacts; (d) sucking the conductive particles by the press head; and (e) pressing the conductive particles into the resin layer by the press head. The conductive particles are disposed corresponding to the metal contacts of the substrate, so that the problem about the short circuit between contacts can be improved, and the product yield and reliability can also be improved.