Most under-screen fingerprint sensors in smartphones utilize optical technology, using light to capture your fingerprint.
Here's a breakdown of how it works:
- Illumination: When you place your finger on the designated area of the screen, the phone illuminates your finger using a bright light source, often an OLED display acting as the light.
- Image Capture: A small camera or sensor located below the screen then captures an image of your fingerprint. This camera is specifically designed to see through the display.
- Pattern Recognition: The sensor analyzes the captured image, focusing on the unique patterns of ridges and valleys in your fingerprint.
- Authentication: This fingerprint pattern is then compared to the fingerprint data previously stored on your phone. If there's a match, the device unlocks.
Essentially, the under-screen fingerprint sensor is a miniature camera that takes a picture of your fingerprint illuminated by the phone's display. This image is then used for authentication.
