Researchers developed perovskite QDs for microLED color conversion

Researchers from the Beijing Institute of Technology and MIIT have developed perovskite quantum dots microarrays with strong potential for quantum dots color conversion (QDCC) applications including micro-LEDs displays.

Perovskite quantum dots microarrays with strong potential for QDCC applications, including photonics integration, micro-LEDs, and near-field displays. Image from Nano Research

Perovskite quantum dots (PQDs) hold potential as an attractive material and can resolve some of the problems found in conventional QDCC. While perovskite quantum dots are relatively new, they have already been shown to have attractive properties that make them extremely suited for electronic and optoelectronic applications.

Nanosys/Glo shows a 0.7" 480x272 microLED microdisplay prototype

In 2021, Quantum Dots developer Nanosys acquired 3D Nanowire microLED display developer Glo. At Displayweek 2022, Nanosys showed Glo's latest new microLED microdisplay prototype. You can see a demonstration in the video below.

The display is 0.7-inch in size, with a resolution of 480x270, or 787 PPI. That is very low for a microdisplay. The microLED chip size is 7x7 um, and the brightness is 50,000 nits. The performance is underwhelming - however such a solution could find applications, depending on the price - and Nanosys suggests using it in an automotive HUD solution.

PlayNitride shows its latest microLED displays at SID Displayweek 2022

PlayNitride demonstrates its latest microLED display prototypes and technologies at SID Displayweek 2022.

PlayNitride SID Displayweek 2022 booth and 132-inch microLED tiled display

At the entrance to PlayNitride's booth, you can see a long 132-inch tiled microLED display, made from 192 modules (each 5" in size). The 7680x1080 59PPI display is completely seamless and offers 3,000 nits and a 116% NTSC color gamut.

ALD passivation found to increase the efficiency of microLEDs, and improve QD color conversion technology

Researchers from the National Yang Ming Chiao Tung University (NYCU) in Taiwan have found that by applying ALD Al2O3 passivation, it is possible to increase the external quantum efficiency of microLED chips.

Picosun Morpher LED ALD system photo

The EQE of 5x5 um microLEDs was enhanced by 70%, and the EQE of 10x10 um chips was enhanced by 60%. The ALD passivation technology was also successfully used for the patterning of color-conversion QDs by inkjet printing (the passivation is used to prevent the quantum dots from photo-oxidation and degradation).

QuantumDots-Info, a new knowledge hub to focus on quantum dots technologies for the display industry

Metalgrass has launched a new knowledge hub, QuantumDots-Info.com. Our new site focuses on QuantumDots technologies for the display industry. QDs are already used in many displays, and it is likely that the future will bring us more types of QD Displays, including QDEL, QD-OLEDs and QD-MicroLEDs that use quantum dots to convert blue light to red and green.

QuantumDots-Info brings you daily news, commentary, resources and updates about QDs in the display industry. You can subscribe to our weekly QD display newsletter here - and if you have not done so already, be sure to also subscribe to the free monthly MicroLED newsletter!

Sharp develops MicroLED microdisplay technology

According to reports from Japan's Nikkan Kogyo Shimbun, Sharp is developing MicroLED microdisplays, with an aim to mass produce such panels in 2023 or 2024 for AR and VR applications.

Sharp apparently already developed two prototypes, including a 0.38" 1053 PPI color one and a 0.13" 3000 PPI blue display. The color display uses blue microLEDs with Sharp's own proprietary color conversion QD technology.