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Related Experiment Video

Updated: May 23, 2026

Polymeric Microneedle Array Fabrication by Photolithography

Polymeric Microneedle Array Fabrication by Photolithography

Published on: November 17, 2015

High refractive index microlenses patterned onto micro-LED arrays using electrohydrodynamic inkjet printing.

Gaoyu Dai^1,2, Kaidi Chen^1,2, Xinhui Meng^1,2

¹Shanghai Key Laboratory of Chips and Systems for Intelligent Connected Vehicle, Shanghai University, Shanghai, 201899, China.

Scientific Reports

|March 20, 2026

Summary

Researchers improved micro-light-emitting diode (micro-LED) image quality by directly integrating high-refractive-index microlens arrays (MLAs). This enhanced peak luminance and reduced unwanted side emissions for better display performance.

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Improving micro-LED display image quality requires reducing pixel crosstalk and enhancing luminance.
Conventional microlens arrays (MLAs) have limited collimation due to the low refractive index of lens materials.

Purpose of the Study:

To develop a direct on-chip integration method for microlenses onto micro-LEDs.
To enhance the collimation performance and image quality of micro-LED displays.

Main Methods:

Utilized EHD inkjet printing to fabricate microlenses with a high refractive index (up to 1.77) directly onto micro-LEDs.
Applied a hydrophobic surface treatment to increase lens sag height for improved performance.

Main Results:

Achieved a 16% increase in peak luminance for the micro-LED displays.
Effectively suppressed large-angle side emission by approximately 12%.

Conclusions:

Demonstrated a practical route for on-chip integration of MLAs on micro-LEDs.
Highlighted the potential of high-refractive-index microlenses for advanced micro-LED display applications.