Adaptive refresh rate technology, also known as LTPO technology, is a TFT backplane technology that acts on OLED screens. In fact, LTPO is a combination of LTPS and IGZO TFT backplane technology.
LTPS (low temperature polysilicon) is the most widely used TFT backplane technology in the market at present, which has the advantages of high resolution, high reaction speed, high brightness and high aperture ratio. Unfortunately, due to the large electron mobility, the leakage current is also large, and the power consumption of low-frequency driving (that is, in the case of low brightness) is also large, which is not enough to save electricity.
Another technology, IGZO (indium gallium zinc oxide), has lower electron mobility than LTPS, so its resolution is not as good as LTPS. However, the low leakage of IGZO makes this technology save some energy in practical use, especially in low-frequency driving scenarios, and the power consumption is lower than LTPS. It can be said that these two technologies have their own advantages and their advantages can complement each other.
Simply put, the integration of LTPO is to ensure the screen display effect and reduce power consumption, so the essence is to save electricity.
At present, most Android machines adopt a fixed refresh rate of 120Hz, which belongs to high screen refresh. Xiaomi MIX4 does not use adaptive refresh technology, but Xiaomi 12 has applications.