The power consumption of smartphones has always been an unavoidable problem.
Power consumption, in turn, determines the battery life of a smartphone, depending on the different applications, usage patterns, and content types that users access.
To help extend the overall battery life of smartphones while reducing power consumption, it is important to optimize the display, especially for broadcast displays such as AMOLED or active matrix organic light-emitting displays.
Currently, mobile AMOLEDs use low temperature polysilicon thin film transistors (LTPS TFTs) as standard backplanes, whether on rigid OLEDs with glass substrates or flexible OLEDs with polyimide substrates.
Due to good electron mobility, high pixel density can be achieved by driving OLED circuits and materials.
In the AMOLED industry, there is a saying that if display manufacturers want to make high-quality AMOLED displays, then it is necessary to first achieve mature manufacturing on LTPS TFTs.
However, a new type of backplane TFT is on the rise, and in the long run, Apple's iPhone may adopt this technology - LTPO TFT (low temperature polycrystalline oxide).
In fact, Apple has applied for three important patents on LTPO technology:
2014: Organic light-emitting diodes show semiconductor oxide and silicon thin film transistors
2015: Silicon thin film transistor and semiconductor oxide thin film transistor
2018: Method for protecting semiconductor oxide channels in a hybrid TFT process flow
Backplane technology is important because it covers the thin film transistor components that drive the main display.
The backplane is responsible for turning individual pixels on and off, so it plays an important role in determining the resolution, refresh rate, and power consumption of the display.