Passive Matrix MicroLEDs

MicroSolid Printing pioneer VueReal is going to unveil several new technologies and products at CES, as the company gets ready for microLED display commercialization. VueReal wants companies to take advantage of the unique properties of microLED displays (mainly the customized production process and the high transparency and high brightness) and this year it will focus on new applications that can be enabled only by microLEDs.

First up, VueReal is launching new microLED Design Reference Kits to enable product designers to buy display samples and integrate into new designs. The first kit will provide microLED-powered lighting panels. These resemble OLED lighting panels - area lighting that is uniform. But unlike OLEDs, microLEDs will provide high brightness, long lifetime, and reduced costs. These are basically monochrome simple displays, and VueReal will offer either in native colour (R, G, B) or phosphor coated (white, red, amber).

MicroLED display developer VueReal announced a strategic partnership with PMOLED producer RiTDisplay display, that will enable device makers to access VueReal's microLED display technologies.

VueReal and RiTDisplay have been collaborating for several years, co-developing automotive displays and lighting solutions. The two companies will now target the consumer market with high-performance and cost-effective displays. The displays will be based on RiT's passive-matrix backplane and VueReal's microLED frontplane solutions.

Taiwan-based MicroLED developer PlayNitride (a MicroLED Industry Association member) has demonstrated its latest microLED displays at Display Week 2023.

First up we have the company's tiled large-area microLED displays, called PixeLED Matrix. The company showed a 166" vertical installation, that is made from 324 modules. The total resolution is 1440x4860 (30 PPI, or a pixel pitch of 0.833 mm). This was a very nice looking demonstration.

Driver IC developer Solomon Systech launched what it says is the world's first PM-MicroLED display driver, the SSD2363. Solomon Systech targets applications such as wearables, home appliances and industrial applications.

The SSD2363 supports a range of resolutions up to 256x256, full-color, with 768 segments and 256 common output, SPI and MIPI interface and sizes up to 3-inches. The company is now sampling the new driver.

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

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.

According to reports from Taiwan, PlayNitride is planning to IPO in 2022. PlayNitride started to sample micro-LED at the end of 2017, and in 2018 PlayNitride demonstrated its first Micro-LED prototypes. PlayNitride has a pilot production facility at Hsinchu Science Park. In 2020 PlayNitride started constructing a second production line that will start mass producing in H2 2021.

The company is also showcasing new microLED displays at Opto Taiwan 2021, which started today. The most interesting display is a 1.58" 256x256 Passive Matrix display. The company collaborated with Solomon Systech to develop the IC for this display. PlayNitride says that this display could be commercialization in 2022. PlayNitride have demonstrated PM-MicroLED displays before, together with RiTDisplay.

This article is the second article in a short series of articles that discuss the efficiency of microLED displays. Our previous article discussed the quantum efficiency of microLED chips - with a conclusion that these can be quite efficient.

This article will look at the entire microLED display, and also compare it to current LCD and OLED displays. After all one of the main advantages of microLED displays is the increased efficiency (and brightness) compared to current displays. Most people assume that indeed microLEDs are much more efficient than OLEDs and LCDs.

In December 2019 Taiwan-based PMOLED display maker RiTDisplay announced that it plans to launch its first MicroLED displays in 2020. Last week during SID Displayweek 2020 the company demonstrated its first prototype, as can be seen in the video below.

The company did not reveal any technical specifications or discuss any commercialization plans.

MicroLED microdisplay developer Plessey Semiconductor announced that it has developed new passive-matrix monochrome microLED microdisplays. Plessey says it can customize the resolution and color of its PM displays to the customer requirements.

Plessey demonstrated its first such PM microdisplays with the 48x36 blue panel you see above. The company says it plans to introduce 384x128 monochrome and 128x128 RGB passive matrix microdisplays by the end of 2020.

In May 2019 PMOLED display maker RiTDisplay announced a strategic partnership and share swap with MicroLED developer PlayNitride, and RiT later said it aims to release its first product to the market in 2020.

RiT announced today that its revenues for the year (to date) were $47.1 million USD - a decrease of 32.4% compared to last year. The company's CEO says that its PMOLED sales has been affected by e-cigarette bans in the US, and the company is now shifting its focus to develop micro LED displays (and also mini-LED ones).