tandem architecture - Page 3

TCL CSOT demonstrated its latest displays, technologies and prototypes at Display Week 2024. The company is focused on inkjet printing technologies, and a lot of the displays on show were indeed printed.

So first up, we TCL demonstrated a 14" 2880x1800 400 nits 30-120Hz ink-jet printed LTPO AMOLED display. The display is produced on a glass substrate, with thin film encapsulation (a 'hybrid OLED').

LG Display demonstrated its latest OLED display prototypes and commercial panels at Displayweek 2024. The company showed flexible panels, automotive displays, transparent OLED, gaming monitors, a 10k nit microdisplay and more.

So first up, LG Display shows its automotive Advanced-Thin-OLED (ATO) displays, which are produced on glass substrates and use a tandem structure. These OLEDs are lower in cost compared to LGD's flexible automotive p-OLED panels, but still enable low-weight and thin profile, and the excellent image quality of an OLED display. The smaller display was a 12.3" 2400x900 (209 PPI) 1,000 nits panel, while the other panel was larger at 17" 1920x2560 (188 PPI).

Samsung Display had a rather large booth at Displayweek 2024, showing its latest OLED displays and technologies. Samsung showed several displays - including foldable smartphone panels, laptop and tablet displays, two QD-OLED displays, its 9.4" round automotive AMOLED, and more.

One interesting display was a panel that combines a foldable and a rollable display, that can open up to an impressively large display. Samsung brands it as a Flex Note Extendable Display.

Yesterday Apple officially announced its 2024 iPad Pro devices, Apple's first tablets with AMOLED displays. There are two devices, a 11" model (1668x2420) and a 13" model (2064x2752). Both OLEDs offer 120Hz and 1600 nits peak brightness - and a tandem architecture. Apple brands these displays as Ultra Retina Tandem OLEDs.

The new iPad Pro 2024 devices will ship next week, starting at $999 for the 11" model. Some of the models offer a matte finish (nano-texture glass coating).

In 2022, Japan Display (JDI) announced that it has developed a "historic breakthrough in display technology" - a new OLED deposition process which they refer to as eLEAP, that is said to be cost effective and can be used to create freeform OLEDs that are brighter, more efficient, and longer lasting compared to OLEDs produced using mask evaporation (FMM).

JDI is planning to establish a 8.7-Gen eLEAP fab in China, and it is also building a smaller-scale 6-Gen eLEAP production line in Mobara, Japan. The company announced that the 6-Gen Mobara fab is advancing ahead of schedule, and production of eLEAP panels will begin before the end of 2024. JDI developed 14" laptop panels that are three times brighter than other OLEDs (at 1,600 nits), and is also targeting smartwatches, smartphones and automotive displays. JDI is also looking into adopting a tandem structure, to increase brightness even further to 3,000 nits.

In January 2024 we reported that Samsung Display and LG Display have started to produce AMOLED displays for Apple's future iPads, to be announced later this year. Earlier expectations were for Apple to order a total of 10 million iPad AMOLED displays in 2024 from both LGD and SDC, with LGD getting around 60% of the orders. 

Apple was aiming to launch the new OLED iPads this month, but have now reportedly delayed the release to May, as Samsung is suffering from low yields for the 11" AMOLED panels, mostly due to the tandem stack architecture.

OLED lighting developer OLEDWorks announced that it has been awarded a $8.6 million US army project to develop high-performance OLED microdisplays for consumer and defense applications. The display is targeted specifically towards head-mounted display applications in the AR and VR markets.

OLEDWorks says that its microdisplay platform offers high brightness, full color, and excellent lifetime. The company says that it is developing three OLED microdisplay products. The company's displays are based on OLEDWorks' proprietary multi-stack (3, 4, and 5-stacks) OLED technology to OLED microdisplays.

According to reports, BOE has commercialized a new tandem OLED architecture, that enabled an improvement of 40% in power consumption and a 600% increase in display lifetime. 

As you can see from the teaser poster above, Chinese smartphone maker Honor will release the first phone to adopt the new panel, the Honor Magic 6 Ultimate, next week on March 18th.

LG Display announced that its automotive OLED displays (both its flexible P-OLED panels and its rigid ATO panels) received TÜV Rheinland’s ‘Product Carbon Footprint’ certification, a milestone marking compliance with emissions standards across the product’s lifecycle. LGD's automotive OLEDs are highly efficient, and both utilize the company's tandem OLED structure.

LGD says that it recently introduced a new film to its automotive OLEDs, developed in-house, "Light Control Film Integration Technology" that enabled it to reduce its automotive OLEDs carbon emissions by up to 18% compared to its previous OLEDs.  This method also has the added benefit of effectively streamlining the manufacturing process, further reducing product weight, and improving power efficiency compared to conventional panels that use external films.

Reports from Korea suggest that Samsung Display and LG Display are starting to produce AMOLED displays for Apple's future iPads, to be announced later this year. Samsung is set to produce 11" LTPO AMOLED displays, while LG Display is producing displays for the 13" model (but LGD will also produce 11" AMOLEDs in the future for Apple). 

The Elec says that both Korean makers developer 11" and 13" displays, but for some unknown reason only LGD will produce the 13" displays. This could change in the future, of course. One reason could be that LG Display has more experience with tandem OLED architectures (developed originally by LGD years ago for automotive OLEDs).