A fingerprint identification device, its driving method, and display device
A technology of fingerprint recognition and devices, which is applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, instruments, etc., and can solve problems affecting the accuracy of fingerprint recognition and inaccurate fingerprint images
Active Publication Date: 2021-04-27
BOE TECH GRP CO LTD
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Problems solved by technology
The inventor found that the ultrasonic sensor in the related art has leakage phenomenon in the process of fingerprint identification, which makes the obtained fingerprint image inaccurate, which in turn affects the accuracy of fingerprint identification
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[0039] The application describes a number of embodiments, but the description is illustrative rather than restrictive, and it will be obvious to those of ordinary skill in the art that within the scope of the embodiments described in the application, There are many more embodiments and implementations. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.
[0040] This application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of this application can also be combined with any conventional features or elements to form unique inventive solutions as defined by the clai...
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Abstract
A fingerprint identification device, its driving method, and a display device, wherein the fingerprint identification device includes: a receiving electrode layer, a piezoelectric material layer, a driving electrode layer, and a processor; the piezoelectric material layer is arranged between the receiving electrode layer and the driving electrode layer The piezoelectric material layer is used to emit ultrasonic waves under the excitation of the driving voltage, and is also used to convert the ultrasonic waves reflected back from the fingerprint to be tested into electrical signals; the processor is respectively connected to the driving electrode layer and the receiving electrode layer for The driving voltage and the fixed voltage are simultaneously applied to the driving electrode layer, and the fixed voltage is also applied to the receiving electrode layer while obtaining the electrical signal output by the receiving electrode layer, and is also used to obtain a fingerprint image according to the electrical signal. The technical solution provided by this application realizes real-time sending and receiving of ultrasonic waves, reduces electric leakage, can ensure the accuracy of fingerprint images obtained, and further improves the accuracy of fingerprint recognition.
Description
technical field [0001] This article relates to the field of display technology, in particular to a fingerprint recognition device, a driving method thereof, and a display device. Background technique [0002] In recent years, with the development of science and technology, electronic products with biometric functions have gradually entered people's lives and work. Fingerprints are invariant features that are inherently unique to human beings and distinguishable from them, and consist of ridges and valleys on the skin surface of the fingertips. Due to its uniqueness and invariance, fingerprints can be used for personal identification, so fingerprint recognition technology has attracted much attention. [0003] At present, the implementation methods of fingerprint identification mainly include optical, capacitive, and ultrasonic imaging technologies. Among them, the identification realized by ultrasonic sensors has 3D characteristics, so it is safer, has better user experienc...
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IPC IPC(8): G06K9/00
CPCG06V40/1306G06V40/1347
Inventor 刘英明王海生丁小梁王雷王鹏鹏李昌峰
Owner BOE TECH GRP CO LTD