In-display fingerprint sensors are an important component of the current hole-punch display designs used by the majority of Android makers. However, there is an exception to the rule, foldable phones such as the Samsung Galaxy Z Fold 4 and Flip 4. The fingerprint sensor was positioned on the side of those handsets, and it is expected to remain there on the Samsung Galaxy Z Fold 4 and Flip 4 this summer. That may appear to be a step back from the standard Android smartphone functionality. Android smartphone makers choose fingerprint sensors for 3D face authentication, whereas Apple favors the latter.
The large notch at the top of the iPhone is the result of Face ID. On Android phones, however, there is no need for a notch. On Android devices, the fingerprint sensor is located beneath the screen, allowing OEMs to offer all-screen display designs without foregoing the extra protection that biometrics may provide.
On the other hand, Foldable smartphones are more complicated since they provide users with two experiences. Regardless of whether we’re looking at the Fold or Flip designs, each smartphone features a main foldable display on the inside and a second cover screen on the outside. Where do you position the fingerprint sensor to ensure that it is always available to users?
The fingerprint sensor on the Galaxy Z Fold 4
The foldable screen may appear to be the most useful display, especially on clamshell designs like the Galaxy Z Flip 3. However, because the fingerprint sensor is hidden beneath the foldable display, the user will have to unfold the phone first in order to unlock it. This can be an issue when making mobile payments on a device like the Flip 3. There’s the argument for placing the fingerprint sensor beneath the cover display of smartphones like the Fold.
However, when the primary screen is unfolded, it is largely unavailable for use. And anyway, the fingerprint reader does more than just unlock the phone. It also verifies you within apps as you use them. With all that in mind, it’s hardly surprising that the Samsung Galaxy Z Fold 4 and Flip 4 will retain their predecessors’ fingerprint sensors. According to Business Korea, Samsung has considering adopting in-display sensors for its next phones. Ultimately, Samsung decided not to pursue such ambitions.
Samsung holds patents for twin in-display fingerprint sensors for foldable phones such as the Samsung Galaxy Z Fold 4. The sensors would be placed beneath both the cover screen and the foldable panel. Users might well have access to a fingerprint sensor regardless of how they used a Fold handset.
Although keep in mind that, such a design would incur significant expenses. Samsung will have to employ two sensors, which would take up extra space inside the phone. Given all of this, placing the fingerprint sensor in the side button makes more sense for the Samsung Galaxy Z Fold 4 and Flip 4.
According to the same publication, the Vivo X Fold, which will be released next week, will have in-display ultrasonic fingerprint sensors on both the cover and the folding screen.