Introduction to the principle of fingerprint recognition under the screen _ Analysis of the principle of fingerprint recognition technology under the screen

Fingerprint recognition under the screen is a cutting-edge technology that has gained significant attention in the smartphone industry. This method allows users to unlock their devices by placing their fingers directly on the display, eliminating the need for physical buttons or facial recognition. The core of this technology lies in the sensor, which detects and verifies the unique patterns of the fingerprint. The process involves illuminating the area where the fingerprint is placed using the screen's backlight. The reflected light from the fingerprint is then captured by the sensor, which processes the image and matches it against the stored data. This technique is particularly advanced, requiring precise engineering and high-quality materials. One of the most notable sensors in this field is the Clear ID FS9500, developed by Synaptics. It uses optical technology and can be integrated into AMOLED screens with a thickness of just 1.5mm. This design ensures that the screen remains intact and functional while providing reliable fingerprint recognition. The sensor works by emitting light through the OLED panel, capturing the reflected light from the fingerprint, and processing it for identification. In addition to optical solutions, ultrasonic fingerprint recognition is another promising approach. Companies like Qualcomm have introduced technologies such as Sense ID, which use sound waves to detect fingerprints. This method is more versatile, as it can work through various materials, including glass and plastic, and is less affected by dirt or moisture. Despite the technological advancements, challenges remain. For instance, ultrasonic sensors may struggle with thicker glass, requiring modifications to the device's design. However, companies are continuously improving these systems to enhance accuracy, speed, and security. As full-screen smartphones become the norm, the demand for under-screen fingerprint recognition is expected to grow. Major manufacturers are investing heavily in this technology to meet consumer expectations and stay ahead in the competitive market. Whether through optical or ultrasonic methods, the future of fingerprint recognition looks promising, offering a seamless and secure user experience.

Fresnel Lens

The fresnel lens is a thin sheet made of plastic material. One side of the lens surface is smooth, and the other side is molded with concentric circles from small to large. Its grooves is designed from the interference of light, the relative sensitivity, and receiving angle requirements.

Compared to the conventional Spherical Lens, a Fresnel lens by the lens divided into a series of concentric circles theoretically infinite number of lines (i.e., the Fresnel zone) to achieve the same optical effect, while saving the amount of material For these lines, the overall thickness of the lens is reduced; ordinary Fresnel convex lens is actually a continuous curved surface is truncated to a section of a discontinuous change of the curvature as the surface is finely divided, so look like a
circle around the lines. Fresnel lenses may in fact be regarded as a series of prisms are arranged in a ring, wherein the relatively sharp edge, and the center of the convex surface is relatively smooth.

Fresnel lenses are mainly used in optical imaging industry ( projectors, VR, AR, etc.), Fresnel lenses are used in LED lighting distribution (spotlights, floodlights, stage lights, traffic signal lights), infrared induction lenses are used in ( industry 4.0 intelligent fields, building security systems, induction lighting, etc.), large Fresnel lenses are used in ( photovoltaic concentrated light generation, heat collection, light utilization, etc.).

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