Even though the OnePlus 6T is not an upgrade from the 6 Series its star feature, the in-display fingerprint reader, is interesting enough to do the party trick. OnePlus has confirmed that the scanner is an optical scanner. This technology makes it slower, less reliable, and less secure than capacitive or ultrasonic sensors. We could not take a closer look so far.
There are three common designs for fingerprint scanners, and the optical one is the least popular in the series for obvious reasons.
Optical Scanner: This sensor captures an image of the finger and requires light. This shiny ring of light around your finger, when you scan it with the OnePlus 6T, is not just for viewing but illuminates your finger so that the sensor (usually a camera) can take a photo. This scanner is the least reliable, as dirt or irregularities on the fingers or surface, including scratches, can result in failed authentication. It's also one of the simplest technologies that can be deceived, as all it needs is a 2D image of your fingerprint.
Capacitive Sensor: This is by far the most popular option. Unlike the optical scanner, a capacitive scanner uses capacitors (current) to take a snapshot of your finger. These sensors are far more reliable because they capture the 3D shape of your fingerprint, not just the image. Most fingerprint scanners, including Apple's TouchID, use this technology.
Ultrasonic Sensor: These sensors go deeper. While the previous two examples capture the surface of your finger, an ultrasound scanner uses sound waves to image the skin layer of your skin; H. The layer just below the outer skin layer. Because of this, these sensors are extremely accurate and almost impossible to fool. They are also unaffected by dirt or scars.
Back to the OnePlus 6T, we normally contact iFixit the latest hardware, but in this case it was Zack from JerryRigEverything who first came to the OnePlus 6T. If you love phones, this is not a channel you want to see. Zack insists on scratching, bending and burning every smartphone on which he can lay his hands. * shudder *
In any case, Zack had the OnePlus 6T in his hands and decided to take a close look at the fingerprint scanner on the device's display.
That's fine when you've torn the phone apart. If you have the right tools, Zack finds the sensor is underneath the battery. A closer look reveals that, as expected, the sensor is a camera mounted under the OLED display of the phone.
Removing the camera reveals a small hole through which the camera can look into the world. Type of. Since the camera has to look between the display pixels, the hole is more like a frosted glass window.
The light you see when scanning comes from the OLED display itself. However, since the pixels only glow in one direction, the camera is not blinded by the light from the display.