The in-display Touch ID has been touted as the Holy Grail for the iPhone in the past few years.
DigiTimes reported in 2015 that Apple was working on touch and display driver integration (TDDI) single-chip solutions for the iPhone where fingerprint sensors are integrated with the virtual home button. Later that year, G for Games reported on five different iPhone 7 configurations with one having embedded fingerprint recognition technology in the display.
In 2016, it was uncovered that Apple filed a patent in March 2015 on optical, capacitive and ultrasonic fingerprint reading technologies. A year later, the U.S Patent and Trademark Office (USPTO) granted Apple some patents with one describing an invention of a fingerprint sensor embeded within the touch display for authentication. Analyst Kuo wrote in 2019 that he believes an iPhone with Face ID and in-screen Touch ID could arrive in 2021.
Bloomberg also jumped on the bandwagon and said that Apple is developing an in-screen fingerprint reader for use as early as 2020. In September last year, the USPTO granted Apple another patent for an in-screen Touch ID.
Earlier this year, Bloomberg wrote that a key feature of the 2021 iPhone could be the in-screen Touch ID which will work alongside Face ID as another authentication method. The Wall Street Journal also made a similar claim in the following month. Barclays analysts followed up with their own analysis that the iPhone 13 would come with the in-display Touch ID and even tout it as the "security feature of the future".
However, hopes were dashed late last month when Bloomberg shared that the feature would not make the cut this year and Apple's long term goal is "to implement Face ID in the display itself".