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Optical fingerprint sensor module and forming method thereof

A fingerprint sensor, optical technology, applied in instruments, character and pattern recognition, computer parts and other directions, can solve the problem that the performance of the optical fingerprint sensor module needs to be improved, etc.

Active Publication Date: 2020-02-14
SHANGHAI OXI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the performance of existing optical fingerprint sensor modules needs to be improved

Method used

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  • Optical fingerprint sensor module and forming method thereof
  • Optical fingerprint sensor module and forming method thereof
  • Optical fingerprint sensor module and forming method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] As mentioned in the background, existing optical fingerprint sensor modules have poor performance.

[0032] When the optical fingerprint sensor module is used outdoors, it is irradiated by stronger light, and when it is used indoors, it is irradiated by weaker light. Under strong outdoor light, the image obtained by the optical fingerprint sensor module is oversaturated. In order to avoid oversaturation of the image obtained by the optical fingerprint sensor module under the illumination of outdoor light, a common practice is to coat the optical fingerprint sensor with a film, which is used to cut off light in the characteristic wavelength range. When the optical fingerprint sensor module is used outdoors, the film layer cuts off the light in the characteristic wavelength range. However, when the optical fingerprint sensor module is used indoors, the film layer will also cut off the light in the characteristic wavelength range, resulting in reduced brightness of the fi...

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Abstract

The invention discloses an optical fingerprint sensor module and a forming method thereof. The optical fingerprint sensor module comprises an optical fingerprint sensor; a photochromic layer is positioned on the optical fingerprint sensor; the photochromic layer is used for realizing discoloration under the irradiation of ultraviolet light with first intensity so as to selectively cut off light ina characteristic wavelength range; the photochromic layer has a first light transmittance to the light in the characteristic wavelength range under the irradiation of ultraviolet light with a first intensity; the photochromic layer has second light transmittance for the light in the characteristic wavelength range under the irradiation of ultraviolet light with second intensity, the first intensity is greater than or equal to cut-off threshold intensity, the second intensity is smaller than the cut-off threshold intensity, and the first light transmittance is smaller than the second light transmittance. The performance of the optical fingerprint sensor module is improved.

Description

technical field [0001] The invention relates to the field of optical fingerprint identification, in particular to an optical fingerprint sensor module and a forming method thereof. Background technique [0002] Fingerprint imaging recognition technology is to collect the fingerprint image of the human body through the optical fingerprint sensor, and then compare it with the existing fingerprint imaging information in the system to judge whether it is correct or not, and then realize the technology of identity recognition. Due to its ease of use and the uniqueness of human fingerprints, fingerprint imaging recognition technology has been widely used in various fields, such as security inspection fields such as public security bureaus and customs, building access control systems, and consumer products such as personal computers and mobile phones. [0003] The imaging methods of fingerprint imaging recognition technology include optical imaging, capacitive imaging, ultrasonic i...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/20
CPCG06V40/1324G06V10/145
Inventor 李重寰朱虹陆震生
Owner SHANGHAI OXI TECH
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