Fingerprint identification method and device thereof

A fingerprint identification device, configured to identify a fingerprint image of a finger, the fingerprint identification device comprising:

• a photoelectronic sensor module, having a light receiving surface and configured for the finger to come into contact with;
• at least one first light emitting element, emitting an invisible light beam toward the finger;
• at least one second light emitting element, emitting a visible light beam toward the finger;
• an analog/digital converter module, electrically connected to the photoelectronic sensor module;
• and
• a processor module, electrically connected to the analog/digital converter module,
• wherein the invisible light beam is reflected to the photoelectronic sensor module after passing through the finger, such that the photoelectronic sensor module receives at least one invisible light intensity signal of the invisible light beam, the visible light beam is reflected to the photoelectronic sensor module via a surface of the finger, such that the photoelectronic sensor module receives at least one visible light intensity signal of the visible light beam, the photoelectronic sensor module respectively converts the invisible light intensity signal into an invisible light photocurrent signal and converts the visible light intensity signal into a visible light photocurrent signal, the analog/digital converter module respectively converts the invisible light photocurrent signal into a first digital signal and converts the visible light photocurrent signal into a second digital signal, and the processor module respectively outputs a gray-scale fingerprint image based on the first digital signal and outputs a colored fingerprint image based on the second digital signal for identification.

A fingerprint identification method, comprising:

• placing a finger on a photoelectronic sensor module;
• emitting a light beam toward the finger by a first light emitting element;
• reflecting the visible light beam to the photoelectronic sensor module via a surface of the finger, such that the photoelectronic sensor module receives at least one visible light intensity signal of the visible light beam;
• generating at least one visible light photocurrent signal based on the visible light intensity signal by the photoelectronic sensor module, and transmitting the visible light photocurrent signal to an analog/digital converter module by the photoelectronic sensor module;
• generating at least one digital signal based on the visible light photocurrent signal by the analog/digital converter module, and transmitting the digital signal to a processor module by the analog/digital converter module;
• and
• generating a colored fingerprint image and/or a gray-scale fingerprint image based on the digital signal and performing identification based on the colored fingerprint image and/or the gray-scale fingerprint image by the processor module.