In display fingerprint scanner!! Many people think how it works, is there any scanner under the screen of our smart phone or our whole screen is a scanner and many more things, we think.. but actually it is not true, so let's discuss how it works.
Before learning how in display fingerprint works you have to know how many types of displays are there, as there are many kinds of display but in this case we only discuss about 2 types of screen i.e. LCD and LED.
In LCD display there are many lights under the screen that makes the screen glow.
But in case of LED display there are many pixels which glow itself to produce light.
Now about the in display fingerprint, how and where it works. In case of LCD screen, it glows because of back light, so there's no place for fixing an extra hardware for fingerprint scanner. So it is not possible to add in display fingerprint scanner on LCD display.
Now in case of LED display, as earlier discussed that there are many pixels that glows itself, so there are many gaps between the pixels, let's take an example, take a paper and a pen let's start making circles without leaving gaps between two circles.... you will see like this...
Exactly, in this manner LED display appears when you see it on microscope. From the gaps between pixels it is possible to see what's happening on the other side.
So in display fingerprint works exactly like this, on the back side of LED screen they setup a camera that can read your fingerprint.
But in general there are two types of scanner.
First is Optical and other is Capacitive.
Optical, we all have seen this scanner in aadhar card centers. It has camera inside which can take picture of your fingerprint.
And capacitive is that which we use normally in smartphones. Capacitive is much more accurate than optical because you have to actually keep your finger on the scanner in capacitive. But in optical, as it captures images. If you give your fingerprint's image on optical it may open. Normally this will not happen but in cheap attendance scanner it may work.
Now you may think your phone will also opens like this, but in case of smart phones this will never happen because the screen of your screen is capacitive and the scanner is optical, until you touch the screen, screen will not work, so as you touch your screen, scanner starts its work and open your phone.
In LCD display there are many lights under the screen that makes the screen glow.
But in case of LED display there are many pixels which glow itself to produce light.
Now about the in display fingerprint, how and where it works. In case of LCD screen, it glows because of back light, so there's no place for fixing an extra hardware for fingerprint scanner. So it is not possible to add in display fingerprint scanner on LCD display.
Now in case of LED display, as earlier discussed that there are many pixels that glows itself, so there are many gaps between the pixels, let's take an example, take a paper and a pen let's start making circles without leaving gaps between two circles.... you will see like this...
So in display fingerprint works exactly like this, on the back side of LED screen they setup a camera that can read your fingerprint.
But in general there are two types of scanner.
First is Optical and other is Capacitive.
 |
| Optical scanner |
Optical, we all have seen this scanner in aadhar card centers. It has camera inside which can take picture of your fingerprint.
 |
| Capacitive scanner |
And capacitive is that which we use normally in smartphones. Capacitive is much more accurate than optical because you have to actually keep your finger on the scanner in capacitive. But in optical, as it captures images. If you give your fingerprint's image on optical it may open. Normally this will not happen but in cheap attendance scanner it may work.
Now you may think your phone will also opens like this, but in case of smart phones this will never happen because the screen of your screen is capacitive and the scanner is optical, until you touch the screen, screen will not work, so as you touch your screen, scanner starts its work and open your phone.
There are two more type of fingerprint sensor but no reputed company use those sensors in any phones.
I hope you have understand how the in display fingerprint scanner works.
I hope you have understand how the in display fingerprint scanner works.
Thank you..
2 Comments
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