Hold the fingerprint on the screen, this is mainly because the thickness of the screen module itself causes the sensor to not collect enough useful signals. This makes the front capacitive fingerprint recognition scheme useless on full-screen mobile phones. The screen, literally explained, is that the front of the phone is all screens, adopting a bezel-less design, and pursuing a screen ratio of close to 100%. However, due to the current technology, the full-screen phone claimed by the industry is only a super high screen Compared with mobile phones. If you want to make the full screen more "full" or even close to the real "full screen", the fingerprint recognition under the screen must be overcome. There are two main known fingerprint recognition schemes under the screen: One is the use of OLED to achieve, that is, optical identification; the other is ultrasonic fingerprint recognition. According to this text, the following statements are wrong:. ['At present, there are no mobile phones with a screen ratio of 100% on the market.', 'Front capacitive fingerprint recognition has not been implemented on a true full-screen phone.', 'Under-screen fingerprint recognition technology is one of the keys to real full-screen mobile phones.', 'At present, no mobile phone can use optical or ultrasonic fingerprint recognition technology.']