Technical / research

Sundiode and Soft-EPI successfully grew a monolithic all-InGaN stacked-RGB LED structure

Stacked-RGB microLED microdisplay developed Sundiode announced that it has achieved the successful growth of a monolithic, all-InGaN RGB LED structure on a single sapphire wafer. This structure was developed in collaboration with Soft-EPI.

Sundiode's epitaxial technology enables stacked-RGB LEDs with multiple junctions, capable of emitting RGB colors independently. This structure makes it easier to produce ultra-high density microdisplays.

Read the full story Posted: Jan 11,2023

The MicroLED Industry Association to host a Perovskite microLED technology webinar

On March 27 the MicroLED Industry Association will host a private webinar on perovskite materials for the microLED industry. Perovskite materials hold great promise for the solar industry and in recent years we are seeing promising signs for the adoption of perovskites the display industry.

Researchers Fabricate Large-area Sky-blue PeLEDs image

The upcoming Seminar will feature four world-leading speakers, and will also be open to a Q&A session. We will learn more about the state-of-the-art perovskite research and development, with a focus of course on applications in the microLED industry - for both perovskite QDs and PeLEDs.

  • Prof. Henry Snaith FRS: leading the Photovoltaic and Optoelectronic Device Group at Oxford University, founder of Oxford PV and Helio Display Materials
  • Simon Jones: CEO at Helio Display Materials, a perovskite material developer focusing on the display market, spun off from the UK's Oxford and Cambridge universities
  • Prof. Lioz Etgar: leading perovskite researcher, Associate Professor of chemistry at the Hebrew Univeristy of Jerusalem, Israel
  • Samuel Halim: CEO at electronics material developer Avantama

The MicroLED Industry Association was established with an aim to speak in a unified voice and promote microLED display solutions. The association works to improve communication, collaboration and partnerships within association members and assist its members in reaching their marketing and development goals. The association currently lists 29 members, including LG Electronics, 3M, PlayNitride, the Fraunhofer Institute (IZM and FEP), Coherent, Lextar/Epistar and many more.

Read the full story Posted: Dec 20,2022

Toshiba develops a new high-performance phosphor for microLED color conversion

Toshiba Corporation announced that it has developed a new high-performance phosphor material that could be highly useful in microLED color conversion, among other applications. Toshiba aims to start mass producing the new material in 2025, and will soon offer samples for potential partners and customers.

Toshiba says that the new material delivers excellent solubility in polymers or organic solvents, where it is transparent and colorless under visible light, and that emits persistent red-light emissions under UV light, with excellent color purity and a luminescence six times that of current phosphors.

Read the full story Posted: Dec 15,2022

KAIST researchers use an array of microLEDs to create a wearable skin care patch

Researchers from Korea-based KAIST institute developed a microLED-powered wearable patch that acts as an UV-induced inhibitor for melanogenesis, the creation of brown or dark pigments that can lead to skin diseases.

LEDs have been used to photo-stimulate in skin care, but normal devices cannot conform to the skin shape, they operate from a distance which is problematic. If the patch is connected to the skin, it achieves much more effective photo-treatment. In this research, the team fabricated a 4x4 cm2 wearable device made from an array of 100-micron sized microLED chips, vertically interconnected for high flexibility.

Read the full story Posted: Nov 23,2022

Kyoreca developed a new process to grow low-defect microLED GaN devices

Kyocera Corporation announced that it has successfully developed a new process technology to produce microLED (and micro-laser) devices. The process is based on lateral growth of GaN layer on a silicon wafer, in a way that limits defects in most of the area.

The basic process has three steps. First you grow a GaN layer on silicon. The second step is to apply a mask with a has a horizontal gap. The third step is to continue growing the GaN layer. The defects are concentrated in the opening nucleus, but the rest of the growth area remains almost defect free. The actual microLED devices are fabricated from the low-defect region.

Read the full story Posted: Nov 06,2022

RAPT develops unique touch solutions for microLED displays

The COVID-19 pandemic created an increased demand for high quality IT solutions, including monitors and collaborative tools, which prompted LCD and OLED display makers to develop new solutions for this market for applications like computer monitors, signage and more.

RAPT Touch FLIR on tablet image

microLED displays (and also OLED displays) that are 20-inch or more will suffer from incompatibility with standard capacitive touch, because the thin microLED display panels result in large parasitic capacitive coupling with the touch surface. The dynamic driving of microLED (where only lit pixels draw current) further reduces the capacitive touch performance by introducing unpredictable “display pattern noise”. These issues are easily mitigated in small area displays, but as displays increase in size, the performance and costs of capacitive solutions suffer.

Read the full story Posted: Sep 12,2022

MICLEDI and QustomDot to jointly develop color microLED microdisplays with QD color conversion

QustomDot and MICLEDI announced a joint  development program to develop color microLED microdisplays using QustomDot's color conversion technology. The companies will demonstrate a microdisplay that offers a new architecture tailored for high-efficiency color conversion using stable RoHS-compliant QD materials. The displays will be produced using a high-throughput QD transfer and patterning techniques on micron-sized pixels.

QustomDot developed a patented method to produce high-quality and stable QD materials suitable for microLEDs. MICLEDI is producing its microdisplays on 300 mm wafers, and the company developed a new pixel architecture that has been optimized for high-aperture (>60% aperture at a 3μm pixel pitch) which the company says is a key requisite to achieve a high brightness with quantum dots.

Read the full story Posted: Aug 16,2022

Green GaN microLED developer Kubos Semiconductors raises $600,000

UK-based Kubos Semiconductors raised $605,000 to launch its cubic-GaN LED technology into new markets, such as microLED displays.

Kubos says that its unique cubic-GaN technology can increase light output (and efficiency) of green LEDs. Kubos operates in a fabless model and says that its technology is fully compatible with standard LED development process on large wafers, offering lower cost volume production. Kubos is also looking to use the technology to produce red GaN LEDs.

Read the full story Posted: Aug 14,2022

Leyard starts producing microLED displays with Saphlux's QD color conversion technology

LED display market Leyard Optoelectronics announced that it developed the world's first mass-produced microLED display that uses quantum dots color conversion technology. Leyard collaborated with Saphlux (of which it owns around 12%).

Leyard adopted Saphlux's NPQD R1 micro LED technology, and have completed the development and testing of the display technology, and now it can mass produce NPQD-powered displays.

Read the full story Posted: Jul 31,2022

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.
Read the full story Posted: Jun 11,2022