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Optical fingerprint imaging system and array sensor

An imaging system and sensor technology, applied in the acquisition/organization of fingerprints/palmprints, instruments, electric solid-state devices, etc., can solve the problems of irradiating other adjacent pixels and blurring fingerprint images.

Active Publication Date: 2018-06-08
SHANGHAI OXI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in existing optical fingerprint imaging systems, light reflected at a specific point at the interface may travel along multiple directions, so it not only reaches the corresponding pixel located directly below the specific point on the interface, but may also illuminate the to other adjacent pixels, making the final fingerprint image blurred

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  • Optical fingerprint imaging system and array sensor
  • Optical fingerprint imaging system and array sensor
  • Optical fingerprint imaging system and array sensor

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Embodiment Construction

[0039] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The invention will be described in terms of certain specific examples, but the invention is not limited to the disclosed examples. It will be understood by those skilled in the art that various changes can be made to the embodiments without departing from the spirit or scope of the present invention.

[0040] refer to figure 2 and image 3 , figure 2 and image 3 An optical fingerprint imaging system 200 according to one embodiment of the invention is shown. The optical fingerprint imaging system 200 includes a backlight 201 , an area array sensor 202 and a transparent cover 203 , wherein the area array sensor 202 is disposed between the backlight 201 and the cover 203 .

[0041] The area sensor 202 includes a pixel array 2021, and th...

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Abstract

An optical fingerprint imaging system and an array sensor are provided. The optical fingerprint imaging system includes: a cover plate (203, 303, 403, 506), a backlight source (201,304, 404, 503), anarray sensor (202) disposed between the cover plate (203, 303, 403, 506) and the backlight source (201,304, 404, 503), and an optical assembly (204); the array sensor (202) includes an array of pixels(301, 401, 501) each of which has an opaque region (3052) and a nonopaque region (3051), the opaque region (3052) includes an photosensitive device for converting an input light into electronic signals, and the nonopaque region (3051) is adapted for allowing light from the backlight source (201,304, 404, 503) passing through; and the optical assembly (204) is adapted for partially blocking the light from the cover plate (203, 303, 403, 506) to the photosensitive device, and is configured with at least one light tunnel (302) between the cover plate (203, 303, 403, 506) and each of the photosensitive devices, wherein the light tunnel (302) allows light passing through in a preset range of direction. Accordingly, the contrast of a fingerprint image obtained is enhanced.

Description

technical field [0001] The invention mainly relates to the field of optical imaging, in particular to an optical fingerprint imaging system and an area array sensor. Background technique [0002] The optical fingerprint imaging system realizes fingerprint image acquisition based on light reflection / refraction and light sensing. Specifically, when a finger touches the effective area of ​​the optical fingerprint imaging system, the light emitted from the fingerprint imaging system reaches the interface between the fingerprint imaging system and the finger, and is partially reflected at the interface. Since light reflected at different regions of the interface (eg, regions touched by ridges or valleys of a finger) may have different intensities, finger prints can be characterized by light intensity variations. In some solutions, the reflected light can be picked up by a sensor and then converted into an electrical signal. Fingerprint images can be obtained by processing elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/00
CPCH01L27/14623H01L27/14678G06V40/1318
Inventor 朱虹凌严
Owner SHANGHAI OXI TECH