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Quantum dot boost for microLED displays

Business news |
By Nick Flaherty

Micledi Microdisplays in Belgium has teamed up with QustomDot to develop brighter high resolution full-colour microLED displays for smart glasses and other augmented reality (AR) applications.

QustomDot, a spin off from Ghent University in Belgium, combines quantum dot synthesis, surface engineering and ink/photoresist formulation into patterned colour conversion layers for microLED displays. The quantum dots convert the light from the Micledi microLEDs to provide a polychromatic full colour display without having to use filters. This produces displays with higher brightness and lower energy use.

Micledi is a spin-off of research lab imec to produce microLED pixel arrays on large 300mm wafers and has also developed a technique for integrating microlenses onto the pixels using wafer-to-wafer bonding to provide a self-contained, compact, monolithic AR display. Part of the process technology and prototyping is currently being perfected in collaboration with imec and will be transferred to an industrial foundry partner for mass production. The company has a partnership with Global Foundries.

“Polychromatic arrays is an important development for microLED products. The manufacturing precision of MICLEDI’s 300mm microLED approach is a perfect enabler for highly efficient colour conversion. Our new pixel architecture has been optimized for high-aperture (>60% aperture at a 3µm pixel pitch) which is a key requisite to achieve a high brightness with quantum dots” – says Dr. Soeren Steudel, CTO of Micledi.

“New QD materials for colour conversion are a game changer. Our patented method for producing RoHS-compliant QDs deliver high-quality and stable materials. This makes them effective for microLED applications, which will accelerate product development in this untapped market,” said Willem Walravens, CTO of QustomDot.

“We are pleased to support the new microLED developments with imec’s extensive technology background and know-how in the field of high-resolution patterning and transfer. We will continue moving the state-of-the-art in pixel resolution, uniformity and process throughput,” said = Prof. Geert Van Steenberge, R&D Team Leader at imec-UGent.

www.qustomdot.com; www.micledi.com.

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