Other What's the difference between ultrasonic and acoustic fingerprint sensors?

Discussion in 'iPhone' started by racingman, Jul 17, 2019.

  1. racingman macrumors newbie

    Jul 11, 2019
    In regards to next year's iPhones, there are rumours that they will adopt full in-display Touch ID with acoustic or ultrasonic technology. Some articles seem to view them as equals, some say there are slight differences. Can anyone please explain how they're different? Thanks! :)
  2. Shirasaki macrumors G3


    May 16, 2015
    Based on my preliminary and brief search, I think acoustic method might shake the screen very slightly to detect fingerprint while ultrasonic method emit sound waves through screen to detect fingerprint. One thing certain for me is both are using sound waves in different ways to recognise fingerprint and authenticate.

    I am waiting for an acoustic engineer to give a more formal answer. :)
  3. racingman thread starter macrumors newbie

    Jul 11, 2019
    Thanks for the reply! :) Can anyone please explain further?
  4. Moonjumper macrumors 68000


    Jun 20, 2009
    Lincoln, UK
    I thought ultrasonic was a form of acoustics. Maybe the term ultrasonic is being used to signify wavelength, and as a result, accuracy.
  5. JPack macrumors 601


    Mar 27, 2017
    They are referring to the same thing.

    The two main approaches to in-display fingerprint sensor are: ultrasonic echoing and optical imaging.

    Ultrasonic works with LCD and OLED while current optical solutions require OLED due to backlight requirements. Optical solutions tend to have a wider sensing area compared to ultrasonic.

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