Anisotropic Conductive Adhesive for LED Thermal Dissipation
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Solution Overview
Problem
Conventional anisotropic conductive adhesives have poor thermal conductivity, limiting effective heat dissipation from LED devices to the substrate, and existing mounting methods face issues with reliability and production time.
Innovation Solution
An anisotropic conductive adhesive comprising conductive resin particles with a metallic layer and solder particles dispersed in an adhesive agent, where the solder particles are included at 20% to 30% by volume, and the adhesive agent contains alicyclic, heterocyclic, or hydrogenated epoxy compounds, enhancing heat dissipation through increased contact area and mechanical bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional anisotropic conductive adhesive is used, then electrical insulation and basic conductivity are achieved, but thermal conductivity is poor limiting heat dissipation
Solution Approach 1:
The patent uses a composite particle system combining conductive particles (metal-coated resin) and solder particles in an adhesive matrix. This composite structure enables simultaneous electrical insulation (from the adhesive binder), electrical conductivity (from conductive particles), and thermal conductivity (from solder particles with high thermal conductivity), resolving the contradiction between maintaining insulation properties and improving heat dissipation.
Solution Approach 2:
The patent optimizes the volume ratio of solder particles to conductive particles (specifically 20-30% solder particles by volume) to balance thermal conductivity enhancement with maintaining adhesive properties and electrical insulation. This parameter optimization allows sufficient heat dissipation while preventing excessive conductivity that would compromise insulation performance.
2Reliability
If wire bonding method is used, then electrical connection is achieved, but the wire bond may fracture or detach reducing reliability
Solution Approach 1:
The patent merges the electrical connection function and mechanical bonding function into a single anisotropic conductive adhesive layer. This eliminates the separate wire bonding step and its associated reliability issues (wire fracture, detachment), while simplifying the mounting process. The adhesive simultaneously provides electrical connection, mechanical bonding, and thermal management in one integrated solution.
3Strength
If conductive paste is used for electrical connection, then connection is achieved, but adhesive strength is weak requiring sealing resin reinforcement
Solution Approach 1:
The patent creates a composite adhesive system where the adhesive binder provides strong mechanical bonding, conductive particles provide electrical conductivity, and solder particles provide both mechanical reinforcement and thermal conductivity. This composite structure achieves high adhesive strength without requiring separate sealing resin reinforcement, eliminating an additional process step.
4Strength
If oven hardening process is used for die bond material or sealing resin, then bonding strength is achieved, but production time increases
Solution Approach 1:
The patent replaces the thermal field-based oven hardening process with a mechanical field-based crimping process. The crimping action applies mechanical pressure to form metallic bonds between solder particles and electrodes, achieving strong bonding without requiring prolonged high-temperature heating. This substitution dramatically reduces production time while maintaining or improving bonding strength.
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
The solution achieves improved heat dissipation and connection reliability by flattening conductive particles and forming metallic bonds with solder particles during crimping, effectively transferring heat from the LED device to the substrate while maintaining electrical insulation and mechanical strength.
Implementation Method 1
the solder particles are included at 20% to 30% by volume... forming metallic bonds with solder particles during crimping
Implementation Method 2
enhancing heat dissipation through increased contact area... effectively transferring heat from the LED device to the substrate
Implementation Method 3
conductive particles and solder particles dispersed in an adhesive agent... maintaining electrical insulation and mechanical strength
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An anisotropic conductive adhesive in which high thermal dissipation is provided. Conductive particles 31 and solder particles 32 are dispersed in a binder. In a thermally compressed LED device manufactured using this anisotropic conductive adhesive, terminals (electrodes 12a, 14a) of the LED device are electrically connected to terminals of a substrate via particles and the terminals of the LED device and the terminals of the substrate are solder bonded.