The Samsung Galaxy S21 FE features an optical fingerprint sensor.
Based on the provided information, the fingerprint sensor on the Galaxy S21 FE is an optical type. This technology is integrated underneath the display, allowing you to unlock your phone or authenticate apps by simply placing your finger on a designated area of the screen.
Understanding Optical Fingerprint Sensors
Optical fingerprint sensors work by capturing a 2D image of your fingerprint. Here's a simple breakdown:
- How it works: When you place your finger on the screen, a light source underneath illuminates your fingertip. A small camera or sensor then takes a photograph of the light reflecting off the ridges and valleys of your fingerprint.
- Technology: This method relies on the visual differences between the darker valleys (less light reflected) and the brighter ridges (more light reflected) to create an image pattern.
- Placement: Optical sensors are commonly placed under the display on modern smartphones.
S21 FE Fingerprint Sensor Placement and Usage
According to the reference, similar to previous models like the S21 and S20 FE:
- The S21 FE's optical fingerprint sensor is located underneath the display.
- When you need to use the sensor, such as on the lock screen or for app logins, a fingerprint icon appears towards the bottom of the display indicating the precise location of the sensor.
This under-display placement provides a seamless look on the front of the device, eliminating the need for a separate physical button for the fingerprint scanner.
