Source: Sohu.com
Although the iPhone 12 is not yet available, the basic parameters have been almost confirmed through recent multiple exposures, and the report has disclosed to the iPhone 13 that the basic information is as follows: iPhone 13 is designed without bangs, that is, the front camera is an under-screen camera At the top center of the screen. In addition to Wu Liuhai, this model also has an ultra-thin frame design, and its interface seems to have become a USB-C interface. Another piece of news is revealed through Apple's supply chain that next year's high-end iPhone models will develop OLED screens that use LTPO backplane technology.
The screen backplane produced by LTPO technology can provide the device with longer battery life and add new functions such as ProMotion. This technology can turn on and off a single pixel on the display, and pave the way for the constant display function, display panel Industry analyst Ross Youn believes that if Apple plans to provide ProMotion on the iPhone, then LTPO technology is essential, because when the device is inactive, LTPO will allow its refresh rate as low as 1Hz to optimize battery life.
Conventional display backplanes include LTPS and IGZO, etc. LTPO technology is to place LTPS and oxide IGZO design in the same pixel, LTPS is used to drive the display, and oxide is used for switching, which is simply integrated in the same pixel LTPS and Oxide are two types of TFT devices. Oxide is a bottom-gate structure and LTPS is a top-gate structure. This new process combines the advantages of LTPS TFT process driving capability and Oxde TFT process leakage and low power consumption.
The main advantage is to reduce power consumption, that is, to improve battery life. Apple adopted it for the first time on the Watch 4, thereby achieving the effect of increasing standby to 18 hours. Apple originally hoped to apply LTPO technology to not only watches, but also mobile phones and even Pads. However, due to the screen supplier Samsung, its first application on the mobile phone side will be used in Samsung's Note 20 mobile phones, which will be available in the second half of this year. It is worth mentioning that the combination of LTPO and high refresh 120Hz technology can achieve the purpose of both improving performance and reducing power consumption.
This technology can reduce the power consumption when displaying on the screen, so for iPhones that do not perform well in terms of battery life, LTPO OLED is particularly important. LTPO OLED has been used by Apple in the Apple Watch Series 5 in the past. The low-power screen and the screen that can be reduced to a minimum of 1 Hz allow the Apple Watch Series 5 to provide the same function as the Apple Watch Series 4 when long-term display is turned on. Similar battery life. In the past, LTPO OLED was only used on Apple Watch Series 5, because the LTPO OLED oxide layer has very high technical requirements: the oxide layer cannot destroy the structure of the LPTS transistor on the top, nor can it have a great impact on the final thickness of the product. Various technical restrictions make LTPO OLED technology only applicable to small devices such as smart watches for a long time, and missed the iPhone and iPad.
Apple Watch OLED panels all use common LTPS low-temperature polysilicon as the back substrate material OLED panel. In the OLED panel, in order to improve the panel resolution, the conventional approach is to increase the TFT electron mobility and make the capacitor smaller, and because the OLED has multiple transistors per pixel, the capacitor size must be smaller. The smaller capacitor will inevitably delay the electrical signal of the channel resistance. The most effective way is to increase the electron mobility through LTPS to achieve the effect of power saving. But LTPS still has a big problem, it is difficult to apply to large-sized substrates, and LTPS does not optimize the high-performance state of small and medium-sized OLED panels, that is, the high refresh rate screens that we have often mentioned on mobile phones and notebooks will Under LTPS, it brings higher power consumption.
LTPO technology is already one of the inevitable technologies for the next generation of flagship mobile phones. At present, display panel manufacturers including Samsung LG and domestic BOE have carried out research and development of related technologies. In addition to the Samsung reported above will use LTPO technology this year, Mobile phones such as domestic OPPO will also be adopted, and mobile phones such as Huawei Xiaomi will also be adopted next year. What is certain is that LTPO's power consumption reduction, superimposed high refresh 120Hz high display effect, will be the mainstream trend of mobile phones next year.
Post time: Jul-02-2020