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Polymeric Microneedle Array Fabrication by Photolithography
Published on: November 17, 2015
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High refractive index microlenses patterned onto micro-LED arrays using electrohydrodynamic inkjet printing
Gaoyu Dai1,2, Kaidi Chen1,2, Xinhui Meng1,2
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.
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.
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