LTPO OLED backplanes

Samsung announced today four new devices - two foldable smartphones, and two smartwatches, all with AMOLED displays. All of these devices will ship on July 24.

First we have the latest clamshell smartphone, the Galaxy Z Flip6 - that has a foldable 6.7" 120Hz 2,600 nits 1080x2640 LTPO AMOLED display. It also has a 3.4" 720x748 Super AMOLED cover display.

China-based Tianma had an impressive booth at Displayweek 2024, showing numerous OLED and microLED displays and prototypes.

For the automotive market, Tianma showed three new display prototypes. First up is a 13" slidable OLED, with an embedded touch panel, aimed towards car dashboards or center controls.

During Displayweek 2024, Visionox demonstrated many OLED display technologies and panels, and also an interesting microLED prototypes (produced by its subsidiarity Vistar).

Visionox is in the final stages of development of its ViP maskless display production process, and the company showcased some nice ViP smartphone panel prototypes (the technology can be used for any panel size). ViP offers a high improvement in aperture ratio (69% up from 29%) which results in low power consumption and brightness (up to 4X according to Visionox), improved lifetime (up to 6X), improved PPI and more.

Apple was the first company to develop LTPO backplanes and it adopted this innovative and energy-efficient backplane technology back in 2018 in the Watch Series 4. LTPO combines Oxide-TFT and LTPS, by using the IGZO in some of the switching TFTs and LTPS in the remaining switching TFTs and all the driving TFTs. LTPO can reduce the power consumption by 5-15%, and enables variable refresh rate.

According to reports from Korea, Apple developed its 2nd-Gen LTPO backplane technology, that uses the IGZO in all the driving TFTs, and uses LTPS only in the remaining switching TFTs. This leads to higher efficiency compared to the first-generation LTPO backplane.

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).

TCL is demonstrating a new 14" 4K 120Hz flexible AMOLED display that adopts a tandem display structure. The tandem structures enabled a reduction in power consumption of over 30%, an extension of the display's lifetime (3.5X) and a peak brightness of over 2,500 nites.

TCL was also showing a new 6.36" 1200x2670 LTPO AMOLED display, that features the company's new frequency division technology and self-developed frequency scanning circuits. Coupled with an ultra-low power consumption IC, it offers 15-20% power savings compared to TCL's standard AMOLEDs. 

BOE hosted an event to mark the launch of its new X1 AMOLED screen, together with OnePlus, who will adopt the new display in its upcoming OnePlus 12 smartphone. BOE also announced, during the event, that it has produced over 100 million AMOLED displays already in 2023.

The OnePlus 12 will features a 2K (3168x1440) display that will offer a peak brightness of 2600 nits. The smartphone will also sport the company's own Oppo P1 display chip that features high-precision pixel calibration algorithms that ensure high brightness, high image quality - reduced power consumption (by 13%, according to OnePlus). The display is based on BOE's new-generation of LTPO backplane, that the company says offer stable high and low frequency switching and increase image performance, while reducing power consumption compared to its previous LTPO platform.