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Bump-Fabrication Technologies for Micro-LED Display: A Review.

Xin Wu1,2, Xueqi Zhu1,2, Shuaishuai Wang1,2

  • 1College of Physics and Information Engineering, Fuzhou University, Fuzhou 350100, China.

Materials (Basel, Switzerland)
|May 7, 2025
PubMed
Summary

Micro Light Emitting Diode (Micro-LED) technology offers advanced display capabilities but faces fabrication hurdles. Innovations in interconnects and materials are crucial for high-density Micro-LED commercialization.

Keywords:
Micro-LEDball mountingbump fabricationdip solderingelectroless platingelectroplatingevaporationhigh-density interconnectsphotosensitive conductive polymers

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Display Technology

Background:

  • Micro Light Emitting Diode (Micro-LED) displays promise superior performance but require advanced fabrication techniques.
  • High-density interconnects, especially micrometer-scale bump formation, are critical for Micro-LED commercialization.

Purpose of the Study:

  • To systematically review conventional and emerging fabrication methodologies for Micro-LED displays.
  • To identify technological bottlenecks in micrometer-scale bump formation and interconnect fabrication.
  • To propose guidelines for industrial-scale production of high-density Micro-LED displays.

Main Methods:

  • Comparative analysis of traditional methods (evaporation, electroplating) and emerging techniques (electroless plating, ball mounting, dip soldering, photosensitive conductive polymers).
  • Evaluation of methods based on bump control, scalability, cost, substrate compatibility, uniformity, and stability.
  • Identification of critical challenges including uniformity, thermomechanical stability, and environmental compatibility.

Main Results:

  • Evaporation offers precision but lacks scalability; electroplating is cost-effective but has uniformity issues.
  • Electroless plating provides uniform deposition on non-conductive substrates but is slow; ball mounting/dip soldering face miniaturization limits.
  • Photosensitive polymers simplify fabrication but lack long-term stability data.

Conclusions:

  • Achieving micrometer-scale uniformity, thermomechanical stability, and environmental compatibility are key challenges.
  • Integrated hybrid processes, eco-friendly manufacturing, and novel materials are essential for ultra-high-resolution and flexible Micro-LEDs.
  • Strategic guidelines are proposed to facilitate industrial-scale production of advanced Micro-LED displays.