Low-Temperature Polycrystalline Oxid, or LTPO, is an OLED display backplane technology developed by Apple. LTPO combines both LTPS TFTs and Oxide TFTs (IGZO, Indium Gallium Zinc Oxide). LTPO is applicable for both OLED and LCD displays, actually, but this backplane technology is likely to be used exclusively in high-end OLED displays
In LTPO, the switching circuits are using LTPS while the driving TFTs will use IGZO materials. This could lead to a power saving of around 5-15% compared to the currently-used LTPS backplanes. The main drawback of LTPO, however, is that the IGZO TFTs are larger and so the display density may be compromised.
In September 2014 Apple introduced the world's first device to use an LTPO backplane - the Watch Series 4. Compared to the current-generation Watch, the new series has a larger AMOLED display - 1.78" 448x363 on the 44 mm watch and a 1.57" 394x324 one on the 40 mm model.
The latest LTPO OLED news:
According to a new report from Korea, Samsung has decided to build a new flexible OLED 6-Gen (1500x1850 mm) production line (A4E, although this could be a tentative name), which will be located at Samsung's Asan production complex.
The new fab will have a monthly capacity of 30,000 substrates. The first phase (15,000 substrates) will enter production by the end of 2022, and the second phase a year later. Total investment is estimated at over 1 trillion KRW (around $854 million USD).
A few days ago we posted that Apple has reportedly decided to delay its iPad OLED launch to 2023, and the company canceled its current joint development project with Samsung Display, as SDC could not develop what Apple wanted - a tandem stack structure, which would have improved the lifetime and performance of the AMOLED display.
According to a new report from Korea, LG Display is also developing a tablet display for Apple - a 12.9" AMOLED panel. LG's iPad display will be ready for mass production by 2023-2024, and it will use a tandem (2 stacks) architecture on an LTPO backplane. As SDC's project is canceled, it is likely that LG's 12.9" will be the first OLED adopted by Apple's tablets.
Our friends at DisplayMate posted an in-depth technical review of the iPhone 13 Pro Max display. The 6.7-inch 1284x2778 10Hz-120Hz 1200 nits LTPO AMOLED receives DisplayMate's highest display performance grade of A+.
DisplayMate says that the new display outperforms the display adopted by Apple in last year's iPhone 12 Pro Max. The iPhone 13 Pro display's new adaptive 120Hz refresh rate which results in a 25% boost to power efficiency. The new display is also brighter by 27% and enjoys a higher absolute color accuracy. The size of the notch was also reduced by 20%.
Apple introduced its latest iPhones, with four models, all featuring AMOLED displays. We'll start with the iPhone 13 which features a 6.1" Super Retina 1200 nits 1170x2532 (460 PPI) AMOLED display. The iPhone 13 mini offer similar specifications, with a 5.4" 1080x2340 1200 nits AMOLED (476 PPI) displays.
According to reports, Vivo will soon release its latest IQOO smartphone (IQOO 8 Pro). The phone will use an AMOLED display produced by Samsung Display. This panel, in fact, will be the first one to adopt Samsung's latest E5 OLED stack.
We do not have any information on this new stack, but OLED companies keep improving the material stack to enable higher efficiency - and sometimes to increase the color gamut, reduce costs or improve other performance points. Hopefully Samsung will announce the E5 stack officially soon.
Samsung Display has recently announced two design wins for its smartphone LTPO AMOLED displays - the Oppo Find X3 series and the OnePlus 9 Pro. Both adopt the same 6.7-inch 1440x3216 120Hz HDR10+ (1,300 nits peak) LTPO AMOLED display.
Samsung also announced that in the past the company's priority was to improve the image quality and the design of its OLED displays. Moving forward, SDC will focus on lowering the power consumption of its OLED displays. SDC will do so by developing low-power materials and "optimizing power-efficient technologies".
A report from Korea suggests that Samsung will be the exclusive supplier for Apple' LTPO AMOLED displays used in the next iPhone devices. Apple will adopt LTPO, according to the report, in the two higher-end modules in 2021. These models will also support a 120Hz refresh rate.
It was already reported that Apple aims to adopt LTPO in future iPhone displays. It was assumed that LG Display will also be able to produce such displays, but apparently that will only happen in 2022. Samsung already produces such smartphone displays, adopted in the Note 20 Ultra (Samsung brands this technology as Adaptive Frequency or hybrid oxide and polycrystalline silicon, or HOP).
The Elec: BOE will not supply OLEDs to Apple smartphones in 2021, LGD and SDC to remain exclusive suppliers
Earlier this year it was reported that BOE failed to pass Apple's quality tests and did not become a supplier to the iPhone 12 series (BOE also failed to pass Samsung Electronics's display quality test).
According to a new report from Korea, Apple has tested BOE's AMOLEDs for next year's iPhones, but again BOE's OLED production quality is not good enough for Apple, which means that in 2021 Samsung Display and LG Display will remain the exclusive OLED suppliers to Apple's phones. In 2021 it is likely that Apple will introduce LTPO displays in addition to screens with a 120Hz refresh rates and on-cell touch.
Samsung announced several new OLED devices yesterday. We'll start with the new Galaxy Note 20 which sports a 6.7-inch 1080x2400 HDR10+ Super AMOLED Plus display (which could mean this is an RGB display, not a Pentile one). The Galaxy Note 20 Ultra has a larger 6.9-inch 1440x3088 Dynamic AMOLED. The display supports a refresh rate of 120Hz at Full-HD resolution and 60Hz at QHD. According to the Elec in Korea, the Note 20 Ultra display has an LTPO backplane (which Samsung calls HOP).
Next up is the company's 2nd generation Galaxy Z Fold 2 that is an update to the original fold with a larger internal foldable display at 7.6" 1768x2208 HDR10+ 120Hz Dynamic AMOLED and also a larger 6.23" 816x2260 Super AMOLED cover display. The Fold 2 also improves the hinge design and sports an ultra-thin-glass cover (like the Galaxy Z Flip).
Samsung Display is updating its A3 flexible OLED production line, to support two new technologies. The TFT process is being updated, for some of the capacity, to Apple's LTPO technology. LTPO is currently used in Apple's Watch displays, but next-generation iPhones will adopt it as well.
According to UBI, Samsung will dedicate 75,000 monthly substrates to produce smartphone LTPO displays. According to some reports, Samsung has also developed its own backplane technology which is similar to LTPO, it could be that some of this capacity will be used for Samsung's own displays.