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First microLED with integrated micro-lenses

Technology News |
By Nick Flaherty

MICLEDI Microdisplays in Belgium has launched the industry’s first microLED devices with integrated micro-lenses for pixel level beam shaping.

The family has 0.5 micron microLED devices on a sub-3.0-micron pitch the company’s proprietary 300mm manufacturing flow. This allows the display to be coupled with microlenses to boost the image quality of waveguide-based AR glasses.

This provides improved power efficiency by focusing light within the targeted waveguide cone as well as optimal waveguide in-coupling for controllable compensation of colour dispersion. This provides more flexibility for AR system integration and boosts the image quality.

MICLEDI has also developed a modeling platform for micro-lens customization. The platform will be available for AR customers to evaluate the new technology in simulations and to design their own micro-lenses for specific waveguide configurations. Those can then be prototyped using MICLEDI’s manufacturing capabilities. The company has a deal with GlobalFoundries allowing global manufacturing centres in Dresden, New York and Singapore on high volume 300mm wafers.

Samples and test kits of blue and green microLED arrays, plus blue arrays with micro-lenses have been delivered to customers this summer with red microLEDs coming in by the end of 2022. The devices are available for both microLED device evaluation and for display integration with waveguides.

“With micro-lenses, we are pleased to point out that one of the hottest demands from the field, microLED wall-plug-efficiency at ‘AR’ pitch, will be at best-in-class levels. In parallel, we are working on our first RGB modules and exploring approaches for polychromatic RGB integration,” said Sean Lord, CEO of MICLEDI Microdisplays.

“Integration of the micro-lenses in a tightly pitched microLED device is a highlight of MICLEDI’s unique manufacturing capabilities using 300mm wafer fab equipment. High-quality beam shaping requires extreme precision and nanometer scale overlay accuracy that can only be met in a 300mm wafer fab,” said Dr. Soeren Steudel, co-founder and CTO of MICLEDI Microdisplays.

The company was spun-out from research lab imec in 2019 to commercialise the combination of III/V materials processing, 3D integration and 300mm silicon-based processing with a proprietary ASIC to provide a self-contained, compact monolithic AR display with high image quality and power efficiency.

www.micledi.com

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