AUO utilizes TFT (Array) to expand cutting-edge sensing technology and develop various sensor component products. High-resolution CMUT components with stable quality and mass production capabilities can be used to produce high-resolution ultrasound probes and patch-type probes for administering accurate measurement and physiological monitoring over extended periods on patients.
AUO has developed large-size TFT combined with photodiode applications for X-ray imaging, utilizing components with high light sensitivity that can reduce the radiation dose received by the human body during X-ray photography. In addition to glass substrates, flexible substrates can also be selected, making them suitable for portable medical and industrial X-ray imaging sensors.
In addition, AUO's TFT-based full screen optical Fingerprint on Display (FoD) technology allows the entire screen to function as a fingerprint reader with support for multi-finger recognition, thereby enhancing the security and protection of mobile devices. Compared to other technologies that integrate fingerprint recognition and display modules, TFT-based optical fingerprint recognition technology decreases display module thickness and provides a larger sensing area at lower costs, while also improving the recognition success rate.
TFT fingerprint scanning technology uses thin-film transistors (TFT) as the light-sensing element. The photoelectric conversion characteristics of amorphous silicon (a-Si) and low-temperature polycrystalline silicon (LTPS) absorb light sources of different wavelengths. The sensor IC reads the photo leakage current difference of the array sensing components and converts them into digital grayscale images.
The ultra-high pixel density optical sensing technology can accurately detect weak light signals reflected by the finger. Fine fingerprints are detectable, as well as the heartbeat through the subtle gray-scale changes caused by the finger pulse, making identity verification more accurate. TFT structure optimization can reduce signal transmission interference and achieve the best signal-to-noise ratio of the optical sensor. The sensor’s sensitivity is improved by enhancing the intensity of optical signal reception, optimizing the sensor circuit, and using special optical film materials. As a result, integrated fingerprint scanners can meet the highest requirement standards of the FBI’s international safety standard certification.
It is necessary to implement fingerprint recognition, and other security measures as mobile payments have become universal smartwatch functions. TFT optical fingerprint recognition technology can provide fingerprint recognition capability to smartwatch displays without increasing the thickness of display modules.
Today, smartphones contain a massive amount of sensitive data, and app developers require enhanced fingerprint recognition to ensure data security. In addition to multi-fingerprint recognition, TFT optical fingerprint recognition technology is utilized during app usage to determine whether the user possesses the necessary permissions, thereby creating more secure mobile applications.