PPI

HKC unveiled its first microLED display prototype, a 6.67" 100 PPI (roughly 580 × 325) panel that offers 1,000 nits of brightness, and a 99% DCI-P3 color gamut. 

HKC's display is produced on the company's high mobility oxide (HMO) backplane. The company says that its HMO material offers an electron mobility that is 20 to 50 times higher than that of amorphous Silicon (a-Si).

Researchers from the Chemnitz University of Technology have combined several new technologies to enable high density high-brightness microLED displays. The researchers demonstrated a 3400 PPI 1080x780 monochrome green display with a brightness of over 10,000,000 nits.

To achieve this high performance display, the researchers used wafer-scale high-quality epitaxial growth, sidewall passivation, efficient photon extraction, and elegant bonding technologies.

X Display Company (XDC) has announced that it has developed a new micro-IC driven microLED display in collaboration with Lumileds. XDC says that its micro-IC architecture is efficient and also cost-effective to produce, and is already ready for mass production.

The two companies developed a 140 PPI display that uses Lumiled's 13x20 micron LEDs, and XDC's own microIC backplane technology. The display offers high brightness (2360 nits peak) and an excellent image quality. 

Justin Brown is X Display's Executive Vice President for Operations & Equipment. Justin leads the company’s supply chain development, manufacturing partner relationships and also its Equipment division, which provides mass-transfer equipment for XDC’s partners and licensees. Justin was kind enough to answer a few questions we had for XDC.

Q: Hello Justin, thanks for your time. XDC has been a bit quiet in the last few years. Can you bring us up to date on your microLED technologies, processes and products?

Thank you for the opportunity to share the progress at XDC. We have been busier in the near past than ever before. As you know, we first announced our MicroIC technology, our mass transfer process, our manufacturing equipment and the uniqueness of our approach, the IP strength we possess and the experience of the team. This led to broad customer visibility and we narrowed down our efforts to a select set of partners that we are currently working with. We have deep engagements with customers that we anticipate will result in end product announcements in the future.

Tianma shows several MicroLEDs prototypes at Displayweek 2024, including automotive displays, transparent displays, and wearable ones.

The first display was an automotive, a transparent 8.07-inch octagon-shaped display aimed towards digital side mirror applications (to be placed inside the vehicle). The display offers a transparency of 55%, a resolution of 608x1204 (167 PPI) and a brightness of 1,500 nits.

Innolux showed several new microLED display prototypes at Displayweek 2024, as it focuses on microLEDs as its next-generation display solution.

First, the company showcased a large 106" tiled microLED TV display, build from 96 12.3" modules. The display uses 20x40 um blue microLED chips (with QD color conversion) and an LTPS backplane.

AUO had an impressive booth at Displayweek, showing some of its latest microLED prototypes. It is clear that the company is highly focused on microLED technology as its next-gen display strategy.

First up, with a 31" large area single-panel microLED, which AUO says is the world's largest. The display is produced on a single glass LTPS backplane, and offers 120Hz and a brightness of 500 nits. AUO calls this a Large Size A.R.T. MicroLED display.

US-based Q-Pixel announced that it has developed a new 3K x 1.5K, a 1.1x0.6 cm (6800 PPI) microLED microdisplay. Q-Pixel says that this is the world's highest resolution color microdisplay - but they actually mean the highest density full-color microdisplay.

Q-Pixel's technology is based around a single-pixel color-tunable microLED device, and the company's displays are produced using a monolithic process. In May 2023, the company announced a 5,000 PPI full-color microdisplay. In fact, later in 2023 the company announced a 10,000 PPI microLED microdisplay, but the 10,000 display was a passive-matrix microdisplay, and the newly announced display is an active-matrix one. 

Hong Kong based microLED microdisplay developer Raysolve Technology demonstrated two new microLED microdisplay prototypes, 0.11" (320x240) and 0.22" full color displays. The displays feature a density of 7,200 PPI and a brightness of up to 150,000 nits (full color). 

The displays are based on blue LEDs, with the company's proprietary Quantum dot photoresist (QDPR) process. Raysolve says it has optimized its QD process and increase the color gamut of its displays - which now achieve 147.2% sRGB, 104.3% NTSC and 108.5% DCI-P3. 

Poland-based inkjet printing pioneer XTPL has launched its latest printing system, the Ultra-Precise Dispensing (UPD) System that enables the printing of high-precision electronically conductive or insulating structures.

The new systems are suitable for industrial production, and XTPL is targeting the display market, and specifically the microLED display market with its new systems. For microLED developers, UPD offers the ability to deposit precise conductive interconnections, supporting the integration of the microLEDs into heterogeneous microelectronic systems. These interconnections manage control, driving, and power distribution for microLEDs, expanding potential applications in AR/VR devices, smartwatches, automotive displays, and more.