Sven Hujo | DELO: How do you prevent conductive particle migration when jetting two liquid adhesives side-by-side?
00:13:02 - 00:14:45
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How do you prevent conductive particle migration when jetting two liquid adhesives side-by-side?
Integrating structural and electrical bonds in a single micro-assembly step requires dispensing distinct chemistries in close proximity. When liquid Non-Conductive Adhesives (NCA) and Isotropic Conductive Adhesives (ICA) are co-dispensed, they must possess absolute chemical and rheological compatibility.
Without precise rheological control, the silver particles from the conductive ICA will migrate and diffuse into the neighboring NCA channel. This uncontrolled particle percolation degrades mechanical adhesion and introduces massive lateral short-circuit risks under high-density arrays.
Achieving a pristine, sharp boundary under microscopes requires formulating precise viscosity, thixotropy, and surface tension compatibility. Successfully engineered systems maintain distinct boundaries even when applied as sub-millimeter co-jetted droplets.
In this short video, you can learn:
* The critical role of rheological matching in multi-material micro-assembly
* Why silver particle diffusion across liquid boundaries causes devastating electrical failures
* Technical criteria for evaluating chemical co-compatibility during simultaneous jetting operations
š **Clip Abstract** This clip explores the complex physics of dispensing non-conductive and conductive adhesives in immediate physical contact. It highlights how rheological engineering prevents particle diffusion, protecting high-density arrays from catastrophic lateral short circuits.
#IsotropicConductiveAdhesives, #RheologicalMatching, #JetDispensing, #ParticleMigration, #AdvancedPackaging, #MicroAssembly
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00:04:01 - 00:05:08
Why do high-yield micro-assembly lines rely on dual-stage light and thermal curing instead of single-step mechanisms?
Why do high-yield micro-assembly lines rely on dual-stage light and thermal curing instead of single-step mechanisms?
To achieve high-yield assembly of ultra-miniature components like microLEDs, relying on a single curing mechanism often introduces risk. Thermal curing takes time and can lead to thermal expansion-induced drifting, while pure UV curing cannot reach shaded areas underneath the die.
By utilizing a dual-stage process, an initial ultra-fast UV light curing step instantly freezes the component's position within seconds. This initial structural fixation prevents physical misalignment during subsequent transport and bulk handling.
The assembly is then transferred to a thermal oven for bulk curing, ensuring maximum cross-linking density and structural integrity. This hybrid approach eliminates position drift and drastically improves process yield in automated high-throughput manufacturing lines.
In this short video, you can learn:
* How dual-stage UV-thermal curing eliminates component drift during pick-and-place
* The physical mechanisms of light-activation versus secondary thermal cross-linking
* Best practices for securing high-precision optical and electrical alignments
š **Clip Abstract** This clip covers how hybrid curing processes stabilize precise electronic assemblies during automated production. By combining rapid UV fixation with bulk thermal curing, manufacturers can prevent component drift and ensure high reliability.
#DualStageCuring, #UVThermalCuring, #MicroAssembly, #ComponentDrift, #MicroLEDDisplay, #AdvancedPackaging
00:00:29 - 00:02:00
Is solder obsolete for microLED assembly? Anisotropic Conductive Adhesives (ACAs) offer a compelling alternative that eliminates the risk of short circuits.
Is solder obsolete for microLED assembly? Anisotropic Conductive Adhesives (ACAs) offer a compelling alternative that eliminates the risk of short circuits.
Non-Conductive Adhesives (NCAs) are simple structural glues, but for electrical connection, they require pre-formed interconnects like stud bumps to penetrate the adhesive and make contact. This adds complexity to the component or substrate, requiring an extra processing step to create the physical bumps that will establish the electrical pathway through the insulating adhesive layer.
Isotropic Conductive Adhesives (ICAs) are conductive in all directions, much like solder paste. This creates a significant process challenge for fine-pitch components like microLEDs, as precise dispensing is required to avoid the adhesive spreading and bridging between adjacent contact pads, which would cause a short circuit. This need for high-precision deposition can slow down production and reduce yield.
Anisotropic Conductive Adhesives (ACAs) are the game-changer for high-density interconnects. They contain conductive particles but are only conductive in the Z-axis (vertically) when compressed between the chip and the substrate. This means you can apply the adhesive over an entire area without worrying about lateral (X-Y) conductivity, completely eliminating the risk of short circuits and dramatically simplifying the assembly process for mini and microLEDs.
In this short video, you can learn:
* The fundamental differences between NCA, ICA, and ACA bonding technologies.
* Why traditional isotropic conductive materials pose a short-circuit risk for fine-pitch components.
* How Z-axis-only conductivity in ACAs simplifies microLED assembly and enhances process reliability.
š **Clip Abstract** This clip explains the three main types of adhesives used for electronic component assembly: Non-Conductive (NCA), Isotropic Conductive (ICA), and Anisotropic Conductive (ACA). It highlights why ACAs are particularly advantageous for high-density applications like mini and microLED displays, as their unique Z-axis conductivity prevents short circuits.
š Link in comments š
#AnisotropicConductiveAdhesives, #IsotropicConductiveAdhesives, #NonConductiveAdhesives, #MicroLEDAssembly, #MicroLEDDisplays, #ARdisplays
00:07:00 - 00:08:35
Are you choosing the right conductive adhesive category for fine-pitch microelectronic interconnects?
Are you choosing the right conductive adhesive category for fine-pitch microelectronic interconnects?
Selecting the appropriate electronic adhesive requires a fundamental understanding of electrical percolation pathways. Non-conductive adhesives (NCAs) serve primarily as mechanical anchors where electrical contact is maintained purely through physical bump-to-pad force.
Conversely, Isotropic Conductive Adhesives (ICAs) distribute conducting particles uniformly in three dimensions, making them highly effective for uniform bulk connections like grounding but prone to short-circuits in high-density pitches.
For sub-millimeter pitch assemblies such as micro-bumped flip chips and RFIDs, Anisotropic Conductive Adhesives (ACAs) isolate conductivity strictly along the vertical compression axis, enabling multi-terminal connectivity down to the micron scale.
In this short video, you can learn:
* The mechanical and electrical differences between NCA, ICA, and ACA technologies
* Why ICA materials pose a high risk of lateral short circuits in fine-pitch arrays
* How ACA particle sizes enable isolated vertical conductivity for advanced flip-chip packaging
š **Clip Abstract** This clip breaks down the selection criteria and technical distinctions among non-conductive, isotropic, and anisotropic adhesives. It explains how selecting the appropriate electrical pathway geometry prevents shorts in miniaturized semiconductor packages.
#AnisotropicConductiveAdhesives, #FinePitchInterconnects, #ElectricalPercolation, #IsotropicConductiveAdhesives, #AdvancedPackaging, #FlipChipAssembly