TWI773453B - Sensor device adopting sensing pixels having partial spectrum sensing areas - Google Patents

Abstract

A sensor device includes sensing pixels arranged in an array. The sensing pixels include a first sensing pixel and a second sensing pixel. The first sensing pixel obtains a first sensing value S1 based on reflected light from a portion of an object, and has a first region with a first percentage M1 and a second region with a second percentage N1. The first region senses first light of the reflected light. The second sensing pixel obtains a second sensing value S2 based on the reflected light, and has a third region with a third percentage M2 and a fourth region with a fourth percentage N2. The third region senses first light of the reflected light, so that spectrum information of the portion corresponding to the first light is defined according to at least M1, N1, M2, N2, S1 and S2.

Description

Sensing device employing sensing pixels with partial spectral sensing area

The present invention relates to a sensing device, and more particularly, to a sensing device using a sensing pixel having a partial spectral sensing area, utilizing a sensing value obtained by the sensing pixel having a partial spectral sensing area , the spectral information of a specific spectrum can be obtained, or it can be used as the basis for living body judgment (such as true and false finger judgment) or property judgment.

Today's mobile electronic devices (such as mobile phones, tablet computers, notebook computers, etc.) are usually equipped with user biometric identification systems, including different technologies such as fingerprints, face shapes, irises, etc., to protect personal data security, such as application in Portable devices such as mobile phones or smart watches also have the function of mobile payment, and biometric identification has become a standard function for users. ) trend, which makes the traditional capacitive fingerprint buttons no longer used, and then evolves new miniaturized optical imaging devices (some are very similar to traditional camera modules, with Complementary Metal-Oxide Semiconductor (Complementary Metal-Oxide Semiconductor) (CMOS) Image Sensor (abbreviated as CIS) sensing element and optical lens module). The miniaturized optical imaging device is arranged under the screen (it can be called under the screen), and the light is partially transmitted through the screen (especially the organic light emitting diode (Organic Light Emitting Diode, OLED) screen). The image of the object, especially the fingerprint image, can be called Fingerprint On Display (FOD).

In addition to correctly sensing fingerprints, under-screen fingerprint sensing also needs to determine the authenticity of the fingers, so as to prevent someone from using fake fingerprints or fake fingers of another person to impersonate another person and pass the authentication. The current counterfeiting technology is also becoming more and more sophisticated. For example, you can use 2D images or 3D printing to make a mold, and then use this mold to fill in various silicones and pigments to make fake fingers, or you can copy another person's fingerprints into A transparent or skin tone film is attached to the surface of the finger, making it difficult to identify fake fingers with a transparent film attached. The traditional identification methods are all in the 2D sensor array (basically all white pixels that can detect the visible spectrum), and set some color pixels (make a specific color filter on top of them). color filter), such as RGB color filter) is distributed in the 2D array, and then the light signal intensity reflected on the finger is detected by these color pixels. Purpose. However, the judgment of the optical signal intensity is easily affected by the change of the intensity of the ambient light field, which often causes variation in the setting of the threshold value of the optical signal intensity, which greatly affects the authenticity of the judgment.

In view of the above description, there is indeed a need for further improvement in the mechanism for judging real fingers, so as to prevent fake fingers from being detected by fingerprints.

Therefore, an object of the present invention is to provide a sensing device using a sensing pixel having a partial spectral sensing area, and the sensing obtained by sensing the part to be sensed by the sensing pixel according to the occupation ratio of the partial area of the sensing pixel and the sensing pixel. The value is used as the basis for the judgment of living body or property, and can be used to define the spectral information corresponding to the specific spectrum of the tested part.

In order to achieve the above object, the present invention provides a sensing device using sensing pixels having a partial spectral sensing area, comprising a plurality of sensing pixels arranged in an array, and the sensing pixels at least include a first sensing pixel and a second sensing pixel. The first sensing pixel obtains a first sensing value S1 based on the reflected light from a part of an object, and has a first area with a first proportion M1 and a second area with a second proportion N1, The first area senses the first light of the site. The second sensing pixel obtains a second sensing value S2 based on the reflected light, and has a third region with a third ratio M2 and a fourth region with a fourth ratio N2, and the third region senses the reflected light The first light ray of , so that the spectral information of the part corresponding to the first light ray can be defined according to at least M1 , N1 , M2 , N2 , S1 and S2 .

With the sensing device of the above-mentioned embodiment, the spectral information corresponding to the specific spectrum of the tested part can be obtained according to the occupation ratio of the partial area of the sensing pixel and the sensing value obtained by the sensing pixel sensing the tested part, and The judgment of detecting blood oxygen concentration, skin properties or other subcutaneous tissue properties, etc. is performed from the spectral information, without sacrificing the spectral information of the tested site.

In order to make the above-mentioned content of the present invention more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

FIG. 1A shows a schematic diagram of a sensing pixel according to a preferred embodiment of the present invention. As shown in FIG. 1A , the present embodiment provides a sensing pixel 10 , which at least includes a complete light sensing element 11 and a spectral separation element 13 , which is disposed on one side of the light sensing element 11 . The spectral separation element 13 has a first light area 13A and a second light area 13B, respectively processing light with different spectral components. A first part 11A and a second part 11B of the light sensing element 11 pass through the first light area 13A and the second light area 13B of the spectral separation element 13 respectively to sense a measured light from an object F to obtain a comprehensive signal . The first light area 13A and the first portion 11A form a first area 12 of the sensing pixel 10 , and the second light area 13B and the second portion 11B form a second area 14 of the sensing pixel 10 . In this embodiment, the spectral separation element 13 is an optical filter, and the effective area A13 of the first light region 13A is smaller than the effective area A11 of the light sensing element 11 capable of performing light sensing. In one example, the first light area 13A allows a first light L1 (having, for example, a red light spectrum) of the light to be tested to pass through to reach the light sensing element 11 , and the second light area 13B allows all of the light to be tested (having a white light spectrum, for example) to pass through. ) passes through and reaches the light sensing element 11 . In another example, the first light area 13A allows a first light L1 (having, for example, a red light spectrum) to pass through to reach the light sensing element 11 , and the second light area 13B allows a second light L2 (having a blue light, for example) to be detected. or green light spectrum) to reach the light sensing element 11 . With the above design, the sensing pixel 10 can have a part of a specific spectral sensing area to achieve the function of selectively filtering the spectrum of the light to be detected at a specific ratio, which can provide a solution for the application of the following sensing device. In actual design, the ratio of the effective areas A13 to A11 can be adjusted to configure sensing pixels with different area ratios. It can be understood that the spectral separation element 13 in this embodiment may be located on or above the light sensing element 11 .

FIG. 1B shows a schematic diagram of the application of the sensing device according to the preferred embodiment of the present invention. FIG. 2 shows a plan view of a plurality of sensing pixels of FIG. 1B . As shown in FIG. 1B and FIG. 2 , the sensing device 100 of the present embodiment at least includes a plurality of sensing pixels arranged in an array, the light sensing elements of the sensing pixels are formed on a sensing substrate 45 , and the sensing pixels at least It includes the sensing pixel 10 (which may be referred to as the first sensing pixel), and certainly may further include the second, third and fourth sensing pixels 20, 30 and 40, each of which has a specific spectral sensing area with different area ratios. The sensing device 100 is used for sensing a part VIP (measured part, or virtual identical part (Virtual Identical Position)) of the object F, and the sensing pixel 10 obtains a first Sensing value S1. In this embodiment, the sensing pixel 10 has a first region 12 with a first ratio M1 and a second region 14 with a second ratio N1. The first area 12 is used for sensing the first light L1 of the reflected light (specific spectrum, such as red (R), green (G), blue (B) color spectrum, etc.). In the non-limiting example of FIG. 2, it can be seen that M1=25%, N1=75%, but in other examples, M1+N1<100% can also be set. Similarly, the second sensing pixel 20 obtains a second sensing value S2 based on the reflected light from the portion VIP. In this embodiment, the sensing pixel 20 has a third region 22 with a third ratio M2 and a fourth region 24 with a fourth ratio N2. The third area 22 is used for sensing the first light L1 of the reflected light. In conjunction with the sensing pixels 10 , the spectral information of the portion VIP corresponding to the first light L1 can be defined according to at least M1 , N1 , M2 , N2 , S1 and S2 (the spectral information of the light to be measured can also be defined). The sensing device 100 may optionally include a signal processing unit 50 and a database 60 . The signal processing unit 50 is electrically connected to the database 60 and the sensing pixels. The signal processing unit 50 can compare the data pre-stored in the database 60 according to M1, N1, M2, N2, S1 and S2 to determine the authenticity of the object F. In the non-limiting example of FIG. 2, M2=50%, N2=50%, but in other examples, M2+N2<100% can also be set.

Hereinafter, the so-called virtual identical site VIP will be exemplified. For a fingerprint of a finger, the center-to-center pitch of the fingerprint peaks is about 400 to 500µm, and the center-to-center pitch of the sensing pixels is about 10 to 20µm, so that two or three adjacent sensing pixels actually measure to the same part of the finger, because the distance from the finger (object F) to the sensing pixel is about 1,000µm, in the case of a considerable difference between the horizontal and vertical dimensions, the adjacent two or three The object under test seen by each sensing pixel is almost the same position. The depth information of the virtual identical parts representing the same position is substantially the same, and the corresponding spectral information is also the same.

In this example, the signal processing unit 50 can determine the authenticity of the object F according to the six parameters of M1, N1, S1, M2, N2 and S2, and of course can also define the spectral information of the part VIP. In another variation, the six parameters can be output to the electronic device installed with the sensing device 100 for processing by the central processing unit of the electronic device (such as a mobile phone, a tablet computer or a notebook computer, etc.), that is, the central processing unit. Processing can be performed on the above and below data. Therefore, the electrical connection of the signal processing unit 50 to the database 60 is not necessarily a necessary element of the sensing device 100 .

Of course, in order to adapt to different application situations and strengthen the result of authenticity identification, the details of the above embodiments may be changed and expanded. Since a variety of changes can be derived from sensing pixels that can sense a specific spectrum by using a portion of the specific spectrum sensing area with different proportions, this is the core spirit of the present disclosure.

The third sensing pixel 30 obtains a third sensing value S3 based on the reflected light from the portion VIP, and the third sensing pixel 30 has a fifth region 32 with a fifth ratio M3 and a region 32 with a sixth ratio N3 The sixth area 34 and the fifth area 32 are used for sensing the first light L1 of the reflected light, so that the authenticity can be determined according to at least nine parameters of M1, N1, M2, N2, M3, N3, S1, S2 and S3 Judging, of course, it can also be defined that the portion VIP corresponds to the spectral information of the first light ray L1. Alternatively, the signal processing unit 50 may compare the data pre-stored in the database 60 with the nine parameters to determine the authenticity of the object F. In the non-limiting example of FIG. 2, M3=75%, N3=25%, but in other examples, M3+N3<100% can also be set. M1, N1, M2, N2, M3, N3 are all between 0% and 100%.

In this example, the fourth sensing pixel 40 is not provided with a specific spectral sensing area like the sensing pixels 10 , 20 and 30 , so the fourth sensing pixel representing the full spectrum information of the part VIP can be obtained based on the reflected light from the part VIP Measured value S4. In addition to providing a reference, the fourth sensing pixel 40 can also be used to sense other biological features of the object F, such as fingerprints, blood vessel images, blood oxygen concentration images and other biological features. In the actual design, some of the fourth sensing pixels 40 are interspersed with some of the sensing pixels 10 and the second sensing pixels 20 (the third sensing pixels 30 may also be included), and the fourth sensing pixels 40 sense the The signal is regarded as a biological feature, and the sensing pixel 10 and the second sensing pixel 20 (and may further include the third sensing pixel 30 ) are regarded as the data for spectral information determination.

The first area 12 , the third area 22 and the fifth area 32 are used for sensing the first light L1 of the part VIP to obtain the received values S11 , S21 and S31 respectively. The second area 14, the fourth area 24 and the sixth area 34 are used for sensing the second light L2 of the part VIP to obtain the received values S12, S22 and S32, respectively. When the first light L1 is red/green/blue (for example, the finger reflects the light from the display screen), the second light L2 can be pure light or mixed light that is not pure red/green/blue, so that the second light L2 It partially overlaps with the first light ray L1, or does not overlap.

It is worth noting that in a biometric sensor or fingerprint sensor, there may be multiple sensing pixels 10, multiple second sensing pixels 20, multiple third sensing pixels 30, and multiple fourth sensing pixels The sensing pixels 40 sense different spectrums of light passing through a display 80 and an optical-mechanical structure 70 , and are arranged in an array and formed on the sensing substrate 45 . Display 80 may be an LCD, OLED display, micro light emitting diode display, or other existing or future display. The display 80 can provide light to illuminate the finger (object F), and of course other light sources can also be provided to illuminate the finger (object F). In another example, it is not necessary to use the display 80, but a light-transmitting cover plate can be used to cover the optical-mechanical structure 70, and the finger (object F) can touch the light-transmitting cover plate.

The implementation of the optomechanical structure 70 is also not particularly limited. In one example, the optomechanical structure 70 includes a plurality of microlens structures and a light shielding layer. In another example, the optomechanical structure 70 is a collimator structure without a microlens structure.

In actual implementation, the sensing pixel 10 may be constituted by a light sensing element plus a spectral separation element, wherein the area of the spectral separation element divided by the area of the light sensing element is equal to 25%. The spectral separation element is, for example, a red/green/blue light filter, which only allows the red/green/blue light passing through the optomechanical structure 70 to enter the light sensing element. The design of the second sensing pixel 20 and the third sensing pixel 30 can be deduced by analogy.

In the above embodiment, the first region 12 senses the red/green/blue spectral values, and the second region 14 senses the white spectral value. However, the present disclosure is not limited to this, as long as different mixed spectra are used to solve individual spectral values, or even to perform authenticity judgment, the present disclosure is applicable. For example, the first region 12 senses red spectral values, while the second region 14 senses green spectral values, and so on. Therefore, by configuring different spectral sensing regions with different occupancy ratios, signals of different spectra can also be extracted in the back-end signal processing unit for application in the above-mentioned various occasions.

3 to 5 show three-dimensional configuration diagrams of the three sensing pixels of FIG. 1B . As shown in FIG. 1B to FIG. 5 , in the following, the first light L1 is in the red spectrum, the second light L2 is in the white spectrum, and the sensing pixel 10 , the second sensing pixel 20 and the third sensing pixel 30 respectively include area The specific spectral sensing regions accounting for 25%, 50%, and 75% are illustrated as examples, but the disclosure is not limited thereto. In other examples, each sensing pixel may include other appropriate proportions of sensing regions, and the first light and the second light may have non-overlapping spectra.

Referring to FIGS. 1B to 4 , the received values S11 and S12 are combined into a first sensing value S1, and the received values S21 and S22 are combined into a second sensing value S2. Therefore, in the pixel group 53 of FIG. 2, the following equations 1 and 2 are satisfied: S1=M1*I1 +N1*I2=0.25*I1+0.75*I2 [Equation 1] S2=M2*I1+N2*I2 =0.5*I1+0.5*I2 [Equation 2] where I1 represents the intensity of the first light (red light), and I2 represents the intensity of the second light (white spectrum). Since there are two unknowns I1 and I2, I1 and I2 can be solved using two equations. Therefore, when M2 is not equal to M1 and N2 is not equal to N1, the intensity I1 of the first light ray L1 and the intensity I2 of the second light ray L2 are obtained by S1, S2, M1, M2, N1 and N2. The solution of the above equation can be performed by the signal processing unit 50 or the central processing unit of the electronic device. Alternatively, according to the characteristics of the above two equations 1 and 2, the signal processing unit 50 can be used to compare the database 60 according to S1 and S2 to determine the object F in cooperation with the database 60 obtained by measuring the real finger and the fake finger in the experiment. , without first solving I1 and I2, which also provides another feasible way. Alternatively, the signal processing unit 50 may obtain the spectral information of the part VIP according to S1, S2, M1, M2, N1 and N2.

Referring to FIGS. 1B to 5 , in the pixel groups 51 and 52 , the sensing pixels 10 , the second sensing pixels 20 and the third sensing pixels 30 are used, and the received values S31 and S32 are used to synthesize the third sensing value S3 . Therefore, the above equation 1, the above equation 2 and the following equation 3 are satisfied: S3=M3*I1+N3*I2 =0.75*I1+0.25*I2 [Equation 3]

According to Equation 1 to Equation 3, since there are two unknowns I1 and I2, the signal processing unit 50 can use the two equations to solve I1 and I2, but also provides a third sensing value S3, so the sensing can be avoided error. Therefore, the signal processing unit 50 can use S1, S2, S3, M1, M2, M3, N1, N2 and N3 to solve the above three equations, in a way to minimize the error (for example, the least square method), to find Out I1 and I2. Alternatively, the signal processing unit 50 can be used to compare the database 60 according to S1, S2 and S3 to determine the object F according to the characteristics of the above three equations and the database 60 obtained by measuring the real finger and the fake finger in the experiment. Authenticity without first solving for intensities I1 and I2. This also provides another implementable way. Alternatively, the signal processing unit 50 may obtain the spectral information of the part VIP according to S1, S2, M1, M2, M3, N1, N2 and N3.

In the case of using the sensing pixel 10 and the fourth sensing pixel 40, the intensity I2 of the second light L2 can be obtained through S1, S4, M1 and N1, and the signal processing unit 50 can be based on the above equation 1 and the following equation 4 Solve I1 and I2: S4 = I2 [Equation 4].

In the pixel group 51, the sensing pixels 10, the second sensing pixels 20 and the third sensing pixels 30 are arranged in a straight line. In the pixel group 52 , the sensing pixels 10 , the second sensing pixels 20 and the third sensing pixels 30 are staggered, and the three fourth sensing pixels 40 are also staggered. This means that the sensing pixels of the present disclosure can be arranged in various ways, and the arrangement of the sensing pixels is not particularly limited.

The following uses an actual numerical example to illustrate, assuming that the intensity value of the light emitted by the virtual same part is (r, g, b)=(120, 160, 200), and the first sensing pixel has 25% red spectrum sensing area and 75% white spectral sensing area, and the second sensing pixel has 50 percent red spectral sensing area and 50 percent white spectral sensing area. According to [Equation 1], I1 and I2 represent the red and white intensity values, respectively. In theory, (I1, I2)=(120, 120+160+200). During actual sensing, (S1, S2)=(390, 300) obtained by the first sensing pixel and the second sensing pixel. According to [Equation 1] and [Equation 2], (I1, I2)=(120, 480) can be solved, which is the same as the theoretical value. Of course, from (S1, S2)=(390, 300), the following simultaneous equations can also be solved according to the unknown (r, g, b). r+0.75g+0.75b=390 [Equation 5] r+0.5g+0.5b=300 [Equation 6] [Equation 5]*2-[Equation 6]*3 can eliminate g and b, get r=120, g+b=360, r+g+b=480, r/(g+b)=1/3 , r/(r+g+b)=1/4. In this way, the range of r/(g+b) or r/(r+g+b) or the comparison database can be used to judge the authenticity. On the other hand, since the two sensing pixels have white light components, the white light components of these two sensing pixels can be compensated to the white light sensing value of the complete sensing pixel, which can be used as a fingerprint sensor. The measured value can avoid the problem of data omission caused by the two sensing pixels just sensing the feature points of the fingerprint. Of course, if the third sensing pixel is further adopted, a numerical solution method can be used to obtain a better specific optical signal intensity.

It can be understood that when the first sensing pixel has 25% of the red spectrum sensing area and 75% of the green spectrum sensing area, and the second sensing pixel has 50% of the red spectrum sensing area and 50% of the green spectrum When sensing the area, (r, g) and r/g can also be solved by simultaneous equations, which can be used as the basis for authenticity judgment. Other conditions can be deduced by analogy.

Using the above sensing device, the uneven distribution of microvessels in human fingers can be used, so normal visual inspection can find the uneven distribution of finger colors in geometric space, and when the finger starts to touch a surface (such as the surface of a mobile phone screen, its The lower part is, for example, an under-screen optical fingerprint sensor). The microvessels in the finger are compressed to block blood flow, which will further change the skin color of the finger, thus producing color changes in the time domain or space domain. By using either or both of the above two phenomena, the characteristics of the real hand can be judged, which of course is either true or false, thereby avoiding the attack of fake fingers.

According to the above-mentioned embodiment, the spectral information corresponding to the specific spectrum of the measured part is defined according to the occupation ratio of the partial area of the sensing pixel and the sensing value obtained by the sensing pixel sensing the measured part. In addition, a sensing device using sensing pixels with different spectral sensing regions with different occupancy ratios can define the spectral information of the detected part by using the spectral information obtained by the sensing pixels formed by these spectral sensing regions. , as the basis for in vivo judgment without sacrificing the spectral information of the tested part.

The specific embodiments proposed in the detailed description of the preferred embodiments are only used to facilitate the description of the technical content of the present invention, rather than limiting the present invention to the above-mentioned embodiments in a narrow sense, without exceeding the spirit of the present invention and the scope of the patent application Under the circumstance, all kinds of changes and implementations made belong to the scope of the present invention.

A11: Effective area A13: Effective area F: object L1: first ray L2: second ray M1: The first proportion M2: The third proportion M3: fifth proportion N1: The second proportion N2: the fourth proportion N3: sixth proportion S1: The first sensing value S11, S12: Receive value S2: The second sensing value S21, S22: Receive value S3: The third sensing value S4: Fourth sensed value VIP: Parts 10: Sensing pixels 11: Light sensor element 11A: Part 1 11B: Part II 12: District 1 13: Spectral separation element 13A: The first light zone 13B: The second light zone 14: Second District 20: Second sensing pixel 22: The third district 24: District 4 30: The third sensing pixel 32: District 5 34: District Six 40: Fourth sensing pixel 45: Sensing substrate 50: Signal processing unit 51: Pixel groups 52: Pixel groups 53: Pixel groups 60:Database 70: Opto-mechanical structure 80: Monitor 100: Sensing device

[ FIG. 1A ] A schematic diagram showing a sensing pixel according to a preferred embodiment of the present invention. [ FIG. 1B ] A schematic diagram showing the application of the sensing device according to the preferred embodiment of the present invention. [ FIG. 2 ] A plan configuration diagram showing a plurality of sensing pixels of [ FIG. 1B ]. [ FIG. 3 ] to [ FIG. 5 ] show three-dimensional configuration diagrams of the three sensing pixels of [ FIG. 1B ].

10: Sensing pixels

12: District 1

14: Second District

20: Second sensing pixel

22: District 1

24: Second District

30: The third sensing pixel

32: District 1

34: Second District

40: Fourth sensing pixel

51: Pixel groups

52: Pixel groups

53: Pixel groups

100: Sensing device

Claims (8)

A sensing device, comprising at least a plurality of sensing pixels arranged in an array, the sensing pixels at least comprising: a first sensing pixel, obtaining a first sensing value S1 based on reflected light from a part of an object , and has a first area with a first proportion M1 and a second area with a second proportion N1; and a second sensing pixel, which obtains a second sensing value S2 based on the reflected light, and has A third region with a third ratio M2 and a fourth region with a fourth ratio N2, the first region and the third region are used for sensing the first light of the reflected light, so as to be able to sense at least M1 , N1, M2, N2, S1 and S2 to define the spectral information of the part corresponding to the first light, wherein the second area and the fourth area are used to sense the second light of the part, and the second light is White light spectrum, and the first light is red, green or blue spectrum. The sensing device according to claim 1, wherein the sensing pixels further comprise a third sensing pixel, obtain a third sensing value S3 based on the reflected light, and have a fifth ratio M3 Five areas and a sixth area with a sixth ratio N3, the fifth area is used for sensing the first light of the reflected light, so as to be able to detect at least M1, N1, M2, N2, M3, N3, S1, S2 and S3 define the part corresponding to the spectral information of the first light ray. The sensing device of claim 2, wherein the sixth area is used for sensing the second light of the reflected light. The sensing device of claim 2, wherein the sensing pixels further comprise a fourth sensing pixel, and a fourth sensing value S4 representing the full spectrum information of the part is obtained based on the reflected light. A sensing device at least includes a plurality of sensing pixels arranged in an array and a signal processing unit, wherein the sensing pixels at least include: a first sensing pixel, which obtains a The first sensing value S1 has a first area with a first proportion M1 and a second area with a second proportion N1; and a second sensing pixel, obtaining a second sense based on the reflected light The measured value S2 has a third area with a third proportion M2 and a fourth area with a fourth proportion N2, the first area and the third area are used for sensing the first light of the reflected light , so that the spectral information of the part corresponding to the first light can be defined according to at least M1, N1, M2, N2, S1 and S2, wherein the signal processing unit is based on M1, N1, M2, N2, S1 and S2 and a data Compare the pre-stored data in the library to judge the authenticity of the object. A sensing device at least includes a plurality of sensing pixels arranged in an array and a signal processing unit, wherein the sensing pixels at least include: a first sensing pixel, which obtains a The first sensing value S1 has a first area with a first proportion M1 and a second area with a second proportion N1; a second sensing pixel obtains a second sensing based on the reflected light value S2, and has a third area with a third ratio M2 and a fourth area with a fourth ratio N2; and a third sensing pixel, based on the reflected light to obtain a third sensing value S3, and has a fifth area with a fifth proportion M3 and a sixth area with a sixth proportion N3, the first area, the third area and the fifth area are used for sensing the first reflected light Light, the second area, the fourth area and the sixth area are used for sensing the second light of the reflected light, so as to be able to detect the reflected light according to at least M1, N1, M2, N2, M3, N3, S1, S2 and S3 Define that the part corresponds to the spectral information of the first light, wherein the signal processing unit The element compares M1, N1, M2, N2, M3, N3, S1, S2 and S3 with pre-stored data in a database to judge the authenticity of the object. The sensing device of claim 6, wherein the second light ray and the first light ray do not overlap each other. A sensing device, comprising at least a plurality of sensing pixels arranged in an array, the sensing pixels at least comprising: a first sensing pixel, obtaining a first sensing value S1 based on reflected light from a part of an object , and has a first area with a first proportion M1 and a second area with a second proportion N1, the first area senses the first light of the reflected light; and a second sensing pixel, based on The reflected light obtains a second sensing value S2, and has a third region with a third ratio M2 and a fourth region with a fourth ratio N2, the third region is used for sensing the reflected light The first light is used to define the spectral information of the part corresponding to the first light according to at least M1, N1, M2, N2, S1 and S2, wherein the second area and the fourth area are used for sensing the part the second light ray, wherein the second light ray partially overlaps with the first light ray.

Images