Hi Mi Fans!!!
We are here with another interesting debate, Underscreen fingerprint sensor Vs Physical fingerprint sensor. As you may know, many cell phone brands have come up with the new technology of In screen fingerprint scanner or otherwise called the Under screen fingerprint sensor technology. As soon as it was released, it became a sensation among gadgets lovers as it gives a much more premium feel to the device. But still, this technology has a bit of disadvantage compared to the conventional one.
Today we will try to explain both the topics one by one, about its merits and demerits and it's up to you Mi Fans to decide which is better.
So Let's get started...
Physical Fingerprint Sensor
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A fingerprint scanner, capacitive or optical works on the basis of patterns of ridges and valleys found in human fingertips. These ridges and valleys are responsible for the formation of certain unique designs on your fingers. fingerprints are a unique marker for a person, even for an identical twin. And while two prints may look basically the same at a glance, a trained investigator or an advanced piece of software can pick out clear, defined differences and so can a fingerprint scanner.
The physical fingerprint scanner which is quite common in the budget device to higher uses the uniqueness provided by the fingerprint of humans. It uses a capacitive circuit which can make use of electric current patterns with respect to the valley and ridge of the fingerprint.
How it works...
There are two conductor plates form a basic capacitor, an electrical component that can store up charge. The surface of the finger acts as a third capacitor plate, separated by the insulating layers in the cell structure and, in the case of the fingerprint valleys, a pocket of air. Varying the distance between the capacitor plates (by moving the finger closer or farther away from the conducting plates) changes the total capacitance (ability to store charge) of the capacitor. Because of this quality, the capacitor in a cell under a ridge will have a greater capacitance than the capacitor in a cell under a valley.
To scan the finger, the processor first closes the reset switch for each cell, which shorts each amplifier's input and output to "balance" the integrator circuit. When the switch is opened again, and the processor applies a fixed charge to the integrator circuit, the capacitors charge up. The capacitance of the feedback loop's capacitor affects the voltage at the amplifier's input, which affects the amplifier's output. Since the distance to the finger alters capacitance, a finger ridge will result in a different voltage output than a finger valley.
The scanner processor reads this voltage output and determines whether it is characteristic of a ridge or a valley. By reading every cell in the sensor array, the processor can put together an overall picture of the fingerprint, similar to the image captured by an optical scanner.
Advantages of Physical/ capacitive fingerprint scanner :
Disadvantages of Physical/ capacitive fingerprint scanner :
Under-display Fingerprint Sensor
An in-display fingerprint scanner currently only works with OLED displays as the sensor can scan the fingerprint through the OLED dots. An LCD display uses a backlight which won’t allow the sensor to see through the screen.
How it works...
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The Under display fingerprint scanner is considered as a symbol of premium feature now. But still, it is restricted to OLED displays which limits its application to high-end devices.
Advantages of Underscreen Fingerprint Scanner :
Disadvantages of Underscreen Fingerprint Scanner:
So, now it's your time to decide whether you prefer the Under display fingerprint scanner or Physical fingerprint scanner. Do participate in the debate and let us know.
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