CN112699767A

CN112699767A - Anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films

Info

Publication number: CN112699767A
Application number: CN202011559392.7A
Authority: CN
Inventors: 尚大吉; 郭必成; 旷章曲; 刘志碧; 陈杰
Original assignee: Beijing Superpix Micro Technology Co Ltd
Current assignee: Beijing Superpix Micro Technology Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-23

Abstract

The invention discloses an anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films, which comprises a sensor array, wherein the surface of the sensor array is provided with the multispectral or hyperspectral films; the multispectral or hyperspectral film is in a hole shape, a grating shape or a thickness change shape. The intensity of reflected light with different wavelengths can be identified through the principles of small hole imaging, grating or film effect and the like, the process processing difficulty is low, the cost is saved, the identification accuracy is high, and the space required by a chip is saved.

Description

Anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films

Technical Field

The invention relates to a fingerprint detection technology, in particular to an anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films.

Background

Hemoglobin in human blood selectively absorbs light of different wavelengths.

As shown in fig. 1, hemoglobin has weak absorption of 560nm light, and human skin has a specific spectral absorption curve, so that the authenticity of the living fingerprint can be verified through the characteristic.

In the prior art, as shown in fig. 2, a conventional optical fingerprint identification chip verifies the authenticity of a living fingerprint through a color-filter (color coating) of a Bayer model. Or the authenticity of the living fingerprint is verified by emitting light rays with different wavelengths by an additional light source.

The defects of the prior art are as follows:

the process has high processing difficulty, high cost and low identification accuracy.

Disclosure of Invention

The invention aims to provide an anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films.

The purpose of the invention is realized by the following technical scheme:

the anti-counterfeiting optical fingerprint chip integrating the multispectral and hyperspectral films comprises a sensor array, wherein the multispectral or hyperspectral films are arranged on the surface of the sensor array;

the multispectral or hyperspectral film is in a hole shape, a grating shape or a thickness change shape.

According to the technical scheme provided by the invention, the anti-counterfeiting optical fingerprint chip integrated with the multispectral and hyperspectral films provided by the embodiment of the invention can identify the intensities of reflected lights with different wavelengths through principles such as pinhole imaging, grating or thin-film effect and the like, is low in process processing difficulty, saves cost, is high in identification accuracy, and saves the space required by the chip.

Drawings

FIG. 1 is a graph showing a prior art hemoglobin vs. light absorption curve.

Fig. 2 is a schematic structural diagram of a Bayer pattern in the prior art.

Fig. 3 is a schematic structural diagram of an anti-counterfeiting optical fingerprint chip integrated with a multispectral and hyperspectral film according to an embodiment of the invention.

Fig. 4 to 6 are schematic structural diagrams of embodiments of the present invention, respectively.

Fig. 6a to 6b are schematic plan views of the multispectral or hyperspectral films of fig. 6, respectively.

In the figure:

1. sensor array, 2, color coating, 3, multispectral or hyperspectral film.

Detailed Description

The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.

The invention discloses an anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films, which has the preferred specific implementation modes that:

the sensor array is provided with a multispectral or hyperspectral film on the surface;

The hole-shaped and grating-shaped features comprise any one or combination of a circular hole, a long hole, an elliptical hole and a polygonal hole.

The multispectral or hyperspectral film is made of an organic material, a semiconductor medium material or a metal material.

The multispectral or hyperspectral comprises infrared light, visible light and/or ultraviolet light.

The multispectral or hyperspectral film can realize at least one of the following effects:

pinhole imaging effects;

the grating effect;

and (4) thin film effect.

The chip is used for verifying the authenticity of the living fingerprint.

The multi-spectral anti-counterfeiting optical fingerprint chip (multi-spectral) integrated with the multispectral and hyperspectral films can identify the intensities of reflected light with different wavelengths through principles such as micropore imaging, grating or film effect and the like, and does not need color-filter (color coating) to realize living body anti-counterfeiting, so that a plurality of layers of color coatings required in the processing process of the optical fingerprint identification chip can be omitted, the processing difficulty of the process is reduced, and the cost is saved;

the optical fingerprint chip can be verified and counterfeit-proof through multispectral, and due to multispectral characteristics, the recognition accuracy is higher than that of a common optical fingerprint chip;

the multispectral identification can be realized only by the size of the optical sensor without an additional light source, the size of the fingerprint identification device is reduced, the space is saved, the cost and the volume are reduced, and the power consumption is low, so that the multispectral identification device can be used for daily consumer products;

because color-filter and extra light source are not needed, the thickness of the chip used for fingerprint identification can be reduced, and the space required by the chip is saved.

Specific embodiments, as shown in fig. 3 to 6 b:

a fingerprint identification chip integrated with a multispectral or hyperspectral film is used for anti-counterfeiting of the fingerprint identification chip.

Multispectral or hyperspectral includes infrared light, visible light, and ultraviolet light.

The specific use is not limited to all the wave bands of the hyperspectrum, and can be partial wave bands of the hyperspectrum.

The hyperspectral film comprises a porous, raster-shaped or thickness-variable organic material, a semiconductor dielectric material or a metal film.

The hole-shaped and grating-shaped characteristics of the hyperspectral film comprise a circular shape, an oval shape, a polygonal shape and a composite shape structure formed by combining the different shapes.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. an anti-counterfeiting optical fingerprint chip integrating multi-spectral, hyperspectral film, is characterized in that, comprises sensor array, and the surface of described sensor array is provided with multi-spectral or hyperspectral film;

The multispectral or hyperspectral thin films are in the shape of holes, gratings or varying thicknesses.

2 . The anti-counterfeiting optical fingerprint chip integrating multi-spectral and hyperspectral films according to claim 1 , wherein the hole-shaped and grating-shaped features comprise circular holes, elongated holes, elliptical holes, and polygonal holes. 3 . any one or more combinations.

3 . The anti-counterfeiting optical fingerprint chip integrating multi-spectral and hyper-spectral films according to claim 2 , wherein the materials of the multi-spectral or hyper-spectral films are organic materials, semiconductor dielectric materials or metal materials. 4 .

4 . The anti-counterfeiting optical fingerprint chip integrating multi-spectral and hyper-spectral films according to claim 3 , wherein the multi-spectral or hyper-spectral light includes infrared light, visible light and/or ultraviolet light. 5 .

5. The anti-counterfeiting optical fingerprint chip integrating multispectral and hyperspectral films according to any one of claims 1 to 4, wherein the multispectral or hyperspectral films can realize at least one of the following effects:

pinhole imaging effect;

grating effect;

film effect.

6 . The anti-counterfeiting optical fingerprint chip with integrated multi-spectral and hyperspectral films according to claim 5 , wherein the chip is used to verify the authenticity of living fingerprints. 7 .