Sven Hujo | DELO Industrial Adhesives: Can adhesives really match the electrical performance and reliability of solder for demanding display applications? The data might surprise you.
00:03:39 - 00:05:28
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Summary of the clip:
Can adhesives really match the electrical performance and reliability of solder for demanding display applications? The data might surprise you.
Electrical performance is a critical metric for any interconnect material. This clip presents I-V curve data for miniLEDs bonded with DELO's anisotropic conductive adhesive. The results show that the electrical characteristics are virtually identical to the manufacturer's datasheet specifications (which assume solder) and, crucially, remain stable with no significant change even after 500 hours of thermal aging at 120Ā°C.
Beyond electrical stability, mechanical robustness is essential for long-term device reliability. Die shear tests were performed to quantify the adhesion strength of the ACA, which is a measure of how much force is required to push the chip off the substrate. The results demonstrate high initial adhesion, reaching values up to 10 Megapascals, indicating a strong, reliable bond for such small components.
The true test of reliability comes from accelerated aging under harsh conditions. The clip shows that the high die shear strength is maintained with minimal degradation after both 500 hours at 120Ā°C and, even more impressively, after 500 hours of 85Ā°C / 85% relative humidity (damp heat) testing. This proves the material's resilience to both thermal and environmental stressors, making it suitable for robust, long-life products.
In this short video, you can learn:
* How the electrical performance (I-V curve) of ACA-bonded miniLEDs compares to solder.
* The mechanical strength (die shear) achievable with modern conductive adhesives.
* How these critical properties hold up after extensive thermal and damp heat (85/85) reliability testing.
š **Clip Abstract** This clip presents compelling reliability data for anisotropic conductive adhesives used in miniLED assembly. It demonstrates through I-V curves and die shear tests that the adhesive provides stable electrical performance and robust mechanical adhesion, even after prolonged thermal and damp heat aging.
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#MiniLEDAssembly, #AnisotropicConductiveAdhesive, #DisplayReliability, #DieShearTesting, #MicroLEDDisplays, #ARVRDisplays
This is a highlight of the presentation:
Investigation of Electrically Conductive Adhesives for Miniaturized SMD Components
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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
00:13:02 - 00:14:45
How do you prevent conductive particle migration when jetting two liquid adhesives side-by-side?
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
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