Apple touch screen allows wet fingers to sense normally

2022-11-28 17:27:31 260

On March 24, Beijing time, it was reported that the new patent shows that Apple's touch screen may enable wet fingers to work normally in the future

Apple hopes to make the screens of iPhones and iPads better able to recognize touch and gestures even in wet or humid environments. Now a new patent shows that Apple is studying how to compensate for wet fingertips and let the screen react in the way you want.

This Apple patent, called "Fingerprint Auxiliary Force Estimation", focuses on how to distinguish accidental touch and intentional touch on capacitive screen by using pressure under wet conditions. Apple said that in general, capacitive touch screens do not measure the force exerted on the screen or the cover glass, but rather measure the presence or absence of touch and the contact size of touch. The touch force or the change in touch force may be interpreted as additional input beyond simple touch, multi touch, touch and/or proximity input.


Generally, the force is considered to be the size of the pressure exerted on the screen. The more energy transmitted from the screen, the more contacts, and therefore, the greater the applied force. The contact between the fingerprint and the touch surface is used to determine the applied force, that is, the wettability of the fingerprint on the touch surface is interpreted as the applied force.

Therefore, if the screen can detect how wet a person's fingers are, it can recalibrate itself to better determine when the touch is intentional or not. Its working principle may be that wet fingers press the screen slightly wider than dry fingers. In wet conditions, ridges and valleys of fingerprints may be more ductile and may provide better contact, while dry conditions may lead to the opposite result.

The patent describes a calibration device designed to determine the current state of a user's fingerprint. The button or input can be configured with a mechanical actuator that actuates at a known force level, that is, the amount of touch sensed at the time of actuation can have a known force that can be used to calibrate fingerprint auxiliary force estimates.

The rest of the patent mostly studies the different types of equipment that may be used, and the specific details of how the procedures will change at that time. In general, however, the goal is to find out how wet the user's fingers are. Then we can infer when to make a touch or knock reaction according to the humidity reading and the size of the fingerprint on the device.