Research on fingerprint recognition materials under ultra-thin screen

The biggest problem faced in the application of optical under-screen fingerprint identification technology is that the finger reflects back more light information, and the information of the fingerprint is interfered by a lot of stray signals, which i s solved by the appearance of ultra-thin under-screen fingerprint identification materials. Using high transmittance core glass and light shielding cladding glass, the preparation process of fiber optic panel is used to obtain the under-screen fingerprint identification material composed of micron-level 2D optical waveguide collimated array. The test results show that the ultra-thin under-screen fingerprint identification material has a good collimation and selection effect on the reflected light signals from the peaks and valleys of the finger, the light shielding glass absorbs the reflected light signals from the large angle, and the high transmittance core glass conducts the collimated and small-angle reflected light signals, so that a clear fingerprint image can be obtained. The development of ultra-thin under-screen fingerprint identification material provides feasible for ultra-thin 5G cell phones.