PPI - Page 6

Semiconductor Energy Laboratory (SEL) has developed a high density OLED display (5,291 PPI) based on its proprietary CAAC-IGZO (C-Axis aligned crystalline In-Ga-Zn-O) backplane. SEL will discuss this new achievement at SID 2019.

We do not have more information, but SEL has shown some high resolution CAAC OLEDs before. In 2014 it demonstrated a 2.8" 2560x1440 (1,058 PPI) WRGB OLED display. If SEL indeed developed a 5,291 PPI OLED display on glass it is very impressive.

Tianma demonstrated new display technologies at Embedded World in Germany, including two new OLED prototypes. First up is a 10.3" 91 PPI transparent AMOLED panel that features a transparency of up to 50% and high brightness (not disclosed).

The second display is a 4.92" 403 PPI AMOLED that was produced using an ink-jet printing process. Tianma's technology was jointly developed with Guangdong Juhua Printing and Display Technology (which was established in 2016 by CSoT and TianMa).

Taiwan-based INT Tech unveiled its proprietary glass-based high pixel density OLED technology, that enables the production of over 2,200 PPI displays on glass. Such high resolution displays can find applications in the visually demanding devices in the medical market, the defense market and also for VR headsets.

INT Tech demonstrated a 2.17 2,228 PPI prototype (see image above). This technology can compete with OLED microdisplays (Silicon based) for high-end VR solutions for 2 merits: they can be larger than silicon-based OLED microdisplays to achieve higher FOV, and they are at a much lower cost.

Semiconductor Energy Laboratory (SEL) demonstrated two new OLED display prototypes, both based on the company's proprietary CAAC-IGZO (c-axis aligned crystalline In-Ga-Zn-O) backplane material.

First up is the world's smallest 8K display, a 8.3" OLED (1058 PPI) with a resolution of 7680x4320. The panel is based on a white OLED with color filter architecture.

As expected, Samsung unveiled its upcoming foldable smartphone yesterday. The rumors were correct, and Samsung's first foldable device will have two screens - a large 7.3" foldable AMOLED that folds inside, and a smaller OLED that is used when the phone is closed. Samsung brands the display as the Samsung Infinity Flex Display.

The inner foldable display is a 7.3" AMOLED with a resolution of 1532x2152 (361 PPI). The outer display is a 4.5" 840x1960 AMOLED. The whole device seems to be quite thick and about double the depth compared to a standard smartphone.

US and China based Royole launched the world's first foldable OLED device - the FlexPai phone/tablet. The FlexPai has a 7.8" 1920x1440 (308 PPI) AMOLED display, when unfolded, The display folds outwards, and when folded the device has three different displays (front, back and spine).

Royole is now accepting pre-orders for the "Developer Mode" device, starting at $1318 for the 128GB model. The first devices will ship in late December 2018. The company said the device has passed bending, twisting and tension tests over 200,000 times, and the display is much more durable compared to current displays (as it is not covered by glass).

In January 2015 the EU launched the LOMID project to develop next-generation large-area OLED microdisplays, and in 2017 the partners in the project announced the production of a 1-inch diagonal 1200x1920 (2,300 PPI) 120Hz curved OLED microdisplay.

The Fraunhofer FEP demonstrated this panel at SID 2018, as you can see in the video above. The institute also demonstrated a new design which uses two such panels and special optics to provide double the resolution for each eye.

China-based OLED producer Visionox had a very impressive booth at SID 2018, demonstrating the company's latest AMOLED and PMOLED displays and prototypes.

Visionox is now producing AMOLED displays for smartphones and wearables and the company showcased a wide range of AMOLED panels and also commercial phones that use these panels. Visionox also demonstrated many new display prototypes.

In March 2017 OLED maker BOE Technology and OLED Microdisplay maker OLiGHTEK announced a new $170 million joint-venture to produce OLED microdisplays for the consumer VR and AR markets. This will be the world's largest OLED-on-silicon production line that will have an annual production capacity of a million OLED microdisplays, although we have no details on to when it will begin operation.

At SID 2018, BOE quietly demonstrated a new OLED microdisplay - a 0.39" FHD (1920x1080, 5644 PPI) OLED on silicon, that supports a brightness of 3,500 nits and a refresh rate of 90 Hz. It's not clear how close is this display to commercialization, and whether it is part of the JV with OLiGHTEK.

China's largest display maker BOE Display has an active OLED ink-jet printing project, and according to reports the company is establishing an R&D production line (in Hefei) that uses Kateeva's inkjet deposition equipment.

At SID 2018, BOE demonstrated a printed OLED panel for the first time. Surprisingly this is a small mobile OLED display - a 5.5" FHD (400 PPI) flexible AMOLED. It is usually assumed that inkjet printing is limited to around 200 PPI, and so only useful to large area panels (such as TVs or monitors). JOLED's 21.6" 4K printed OLEDs have a PPI of 204, for example. In 2017 Korea-based Unijet's president said that Inkjet printing could reach up to 550 PPI in 2020 by using next-generation laser-droplet technologies.