TWI824671B - Fingerprint collection device, encrypted fingerprint collection method and information processing device - Google Patents

Abstract

The present invention mainly discloses a fingerprint collection device, which includes: a gate drive circuit, a readout circuit, a sensor array including M×N sensing pixels, a first encryption unit, and a second encryption unit. , a control and processing unit. When performing a fingerprint collection operation, the control and processing unit sets a first encryption configuration parameter in the first encryption unit, so that the first encryption unit sends a first enable signal to the gate according to the first encryption configuration parameter. The gate driving circuit controls the gate driving circuit to drive M×N sensing pixels in a pixel sensing sequence to perform pixel sensing. At the same time, the control and processing unit sets a second encryption configuration parameter in the second encryption unit, causing the second encryption unit to send a second enable signal to the readout circuit according to the second encryption configuration parameter to control The readout circuit reads out M×N pixel values from the M×N sensing pixels in a sensing data readout sequence.

Description

Fingerprint collection device, encrypted fingerprint collection method and information processing device

The present invention relates to the technical field of fingerprint identification, and in particular, to a fingerprint collection device with a fingerprint data encryption function.

As financial transactions such as mobile payments and electronic securities orders gradually use electronic products such as smartphones and smart wearable products as the main operating platform, identity recognition systems based on biometric identification technology will be integrated into these smart devices. Mobile electronic devices are also receiving more and more attention. Biometric identification technology collects the inherent physiological characteristics of the human body as the basis for individual biological identification, such as: iris, face, voice, fingerprint and other physiological characteristics. .

Currently, fingerprint identification devices are divided into optical, pressure, ultrasonic, and capacitive types. Among them, capacitive fingerprint identification devices are currently widely used because they are easiest to integrate into a single chip through standard CMOS processes and related control circuits. in various electronic products. Figure 1 shows the architecture diagram of a conventional capacitive fingerprint identification device. As shown in Figure 1, the capacitive fingerprint collection device 1a includes: a sensor array 11a, a gate drive circuit 12a, a readout circuit 13a, and a control and processing unit 14a. When it is necessary to perform a fingerprint recognition operation, a host computer (such as the application processor 2a of a smartphone) notifies the control and processing unit 14a to control the actions of the gate driving circuit 12a and the readout circuit 13a, thereby obtaining a Collect fingerprint images.

FIG. 2 is a block diagram of the sensor array 11a shown in FIG. 1 . As shown in FIG. 2 , the sensor array 11a includes M×N sensing capacitors 111a (ie, sensing pixels). Further, FIG. 3 is a schematic diagram of the sensor array 11a being controlled to perform fingerprint pixel sensing. As shown in Figures 1 and 3, when performing a fingerprint collection operation, the gate driving circuit 12a drives each of the sensing capacitors 111a to sense each pixel, and the readout circuit 13a switches each of the sensing capacitors The sensed pixel value (ie, capacitance value) of 111a is read out. Moreover, when performing a fingerprint collection operation, the pixel is usually sensed with the first (i.e., p00) sensing capacitor 111a in the first row as the starting point and the last (i.e., p77) sensing capacitor 111a in the last row as the end point. pixels, and then drive each pixel one by one in the order from left to right and top to bottom.

After completing the fingerprint collection operation, the readout circuit 13a obtains a collected fingerprint image, and transmits the collected fingerprint image to a back-end host computer (such as the application processor 2a of a smartphone) to then perform fingerprint matching and identification. However, practical experience points out that since the fingerprint collection operation of the conventional technology adopts the fixed mode as mentioned above, this method has many security loopholes and has a great chance of causing the user's fingerprint to be detected during the data storage and/or transmission process. Image leaked.

It can be seen from the above description that a new type of fingerprint collection device is urgently needed in this field.

The main purpose of the present invention is to provide a fingerprint acquisition device with a fingerprint data encryption function, which uses a method of changing the configuration parameters stored in the register to randomly change the order of M×N sensing pixels to perform pixel sensing. The pixel collection sequence of the fingerprint is changed, thereby achieving the beneficial effect of fingerprint data encryption.

In order to achieve the above object, the present invention proposes an embodiment of the fingerprint collection device, which includes: A sensor array including M×N sensing pixels, where M and N are both positive integers; a gate drive circuit coupled to the sensor array; a readout circuit coupled to the sensor array; a first encryption unit coupled to the gate driving circuit; a second encryption unit coupled to the readout circuit; and a control and processing unit coupled to the first encryption unit, the second encryption unit and the readout circuit; and Wherein, when performing a fingerprint collection operation, the control and processing unit sets a first encryption configuration parameter in the first encryption unit, and sets a second encryption configuration parameter in the second encryption unit; Wherein, the first encryption unit generates and transmits a first enable signal to the gate drive circuit according to the first encryption configuration parameter, thereby controlling the gate drive circuit to drive M×N of the gate drive circuits in a pixel sensing sequence. The sensing pixel performs pixel sensing, and the second encryption unit generates and transmits a second enable signal to the readout circuit according to the second encryption configuration parameter, thereby controlling the readout circuit to read out the sensing data in a sequence M×N pixel values are read out from the M×N sensing pixels.

In one embodiment, both the first encryption unit and the second encryption unit are a register.

In one embodiment, the control and processing unit, the first encryption unit and the second encryption unit are integrated into a single microcontroller chip.

In one embodiment, the sensor array is selected from the group consisting of an optical fingerprint sensor array, a pressure fingerprint sensor array, an ultrasonic fingerprint sensor array, and a capacitive fingerprint sensor array. Any one of the groups.

The present invention also discloses an encrypted fingerprint collection method, which is applied in a fingerprint collection device. The fingerprint collection device includes a gate drive circuit, a readout circuit, and a sensor including M×N sensing pixels. A detector array, a first encryption unit, a second encryption unit, and a control and processing unit, and the fingerprint collection device executes the encrypted fingerprint collection method to implement a fingerprint collection operation; where M and N are both A positive integer, and the encrypted fingerprint collection method includes the following steps: The control and processing unit sets a first encryption configuration parameter in the first encryption unit, and sets a second encryption configuration parameter in the second encryption unit; The first encryption unit generates and transmits a first enable signal to the gate drive circuit according to the first encryption configuration parameter, thereby controlling the gate drive circuit to drive M×N sensors in a pixel sensing sequence. Pixel for pixel sensing; The second encryption unit generates and transmits a second enable signal to the readout circuit according to the second encryption configuration parameter, thereby controlling the readout circuit to read out the M×N sensing data in a sensing data sequence. Measure pixels and read out M×N pixel values; and The control and processing unit generates an encrypted fingerprint image based on M×N pixel values.

In one embodiment, both the first encryption unit and the second encryption unit are a register.

In one embodiment, the control and processing unit, the first encryption unit and the second encryption unit are integrated into a single microcontroller chip.

In one embodiment, the sensor array is selected from the group consisting of an optical fingerprint sensor array, a pressure fingerprint sensor array, an ultrasonic fingerprint sensor array, and a capacitive fingerprint sensor array. Any one of the groups.

Moreover, the present invention also provides an information processing device, which is characterized by including the fingerprint collection device of the present invention as mentioned above. Moreover, the information processing device is selected from the group consisting of smart phones, smart watches, smart TVs, tablet computers, notebook computers, all-in-one computers, access control devices, electronic door locks, ATMs, and fingerprint punch cards. An electronic device in a group of machines.

In order to enable the review committee to further understand the structure, characteristics, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred embodiments are attached below.

Figure 4 shows a block diagram of a fingerprint collection device according to the present invention. As shown in Figure 4, the fingerprint collection device 1 of the present invention includes: a sensor array 11, a gate drive circuit 12 coupled to the sensor array 11, and a readout circuit coupled to the sensor array 11. Circuit 13, a first encryption unit 15 coupled to the gate driving circuit 12, a second encryption unit 16 coupled to the readout circuit 13, and coupled to the first encryption unit 15 and the second encryption unit 16 and a control and processing unit 14 of the readout circuit 13 . The fingerprint collection device 1 is characterized in that: the gate driving circuit 12 drives the sensor array 11 according to a specified row driving sequence, and the reading circuit 13 reads the sensor array 11 according to a specified row reading sequence, wherein , the designated row reading sequence is matched with the designated column driving sequence so that multiple pixel values of a frame of the sensed image of the sensor array 11 are output in a designated row and column coordinate sequence. In addition, in feasible embodiments, the fingerprint collecting device 1 of the present invention may be an optical fingerprint collecting device, a pressure fingerprint collecting device, an ultrasonic fingerprint collecting device, or a capacitive fingerprint collecting device. In other words, the sensor array 11 shown in FIG. 3 can be an optical fingerprint sensor array, a pressure fingerprint sensor array, an ultrasonic fingerprint sensor array, or a capacitive fingerprint sensor. array.

FIG. 5 is a block diagram of the sensor array shown in FIG. 4 . As shown in FIG. 5 , the sensor array 11 includes M×N sensing pixels, and the sensing pixels are selected from optical sensors, pressure sensors, ultrasonic sensors, or capacitive sensors. A type of sensor among detectors. To further explain, the fingerprint collection device 1 of the present invention is applied in an information processing device (such as a smart phone) and is coupled to an application processor 2 of the information processing device. Here, for the fingerprint collection device 1, the application processor 2 is its host computer. In particular, the present invention uses a register as both the first encryption unit 15 and the second encryption unit 16. With this design, the configuration parameters stored in the register can be changed to randomly change the order in which the M×N sensing pixels 11 perform pixel sensing, so that the pixel collection order of the fingerprint changes, thereby achieving fingerprint recognition. Beneficial effects of data encryption. In addition, the control and processing unit 14, the first encryption unit 15 and the second encryption unit 16 can also be integrated into a single microcontroller chip.

When it is necessary to perform a fingerprint collection operation, the application processor 2 sends a fingerprint collection command to control the fingerprint collection device 1 to perform a fingerprint collection operation. Then, the fingerprint collection device 1 executes an encrypted fingerprint collection method of the present invention to realize the fingerprint collection operation.

Figure 6 is a flow chart of an encrypted fingerprint collection method of the present invention. As shown in Figures 4 and 6, the encrypted fingerprint collection method includes a plurality of steps. When performing the fingerprint collection operation, first, in step S1, the control and processing unit 14 sets a first encryption configuration parameter in the first encryption unit 15, and sets a first encryption configuration parameter in the second encryption unit 16. 2. Encryption configuration parameters. Next, in step S2, the first encryption unit 15 generates and transmits a first enable signal to the gate driving circuit 12 according to the first encryption configuration parameter, thereby controlling the gate driving circuit 12 to follow a pixel sensing sequence. M×N sensing pixels 111 are driven to perform pixel sensing. Moreover, in step S3, the second encryption unit 16 generates and transmits a second enable signal to the readout circuit 13 according to the second encryption configuration parameter, thereby controlling the readout circuit 13 to read out the sensing data according to a sequence. M×N pixel values are read out from the M×N sensing pixels 111 . Finally, in step S4, the control and processing unit 14 generates an encrypted fingerprint image based on the M×N pixel values.

FIG. 7 is a first schematic diagram of a sensor array controlled for fingerprint pixel sensing. According to the design of the present invention, a first encryption configuration parameter is set in the first encryption unit 15 (ie, a register), so that the first encryption unit 15 generates a first enable based on the first encryption configuration parameter. signal, thereby controlling the gate driving circuit 12 to drive the M×N sensing pixels according to a specific pixel sensing sequence to perform pixel sensing. For example, as shown in FIG. 7 , under the control of the gate driving circuit 12 , the first sensing pixel 111 in the first row (i.e., p00) is used as the starting point for sensing pixels and the last (ie, p00) sensing pixel in the last row is used as the starting point. That is, p77) sensing pixel 111 is the end sensing pixel, and then p00àp07, skip row, p40àp47, skip row, p10àp17, skip row, p50àp57, skip row, p20àp27, skip row, p60àp67, skip row, p30àp37, skip row , p70àp77 to drive each pixel one by one. Moreover, since the present invention simultaneously sets a second encryption configuration parameter in the second encryption unit 16 (ie, register), the gate driving circuit 12 drives M×N of the pixels in the pixel sensing sequence. When the sensing pixel 111 performs pixel sensing, the second encryption unit 16 simultaneously generates a second enable signal according to the second encryption configuration parameter and sends it to the readout circuit 13 to control the readout circuit 13 M×N pixel values are read out from the M×N sensing pixels 111 according to a sensing data reading sequence. It should be understood that the sensing data reading sequence is also p00àp07, skip row, p40àp47, skip row, p10àp17, skip row, p50àp57, skip row, p20àp27, skip row, p60àp67, skip row, p30àp37, skip row, and p70àp77.

Figure 8 is a second schematic diagram of a sensor array controlled for fingerprint pixel sensing. From the foregoing description, it can be known that as long as the first encryption configuration parameter stored in the first encryption unit 15 is changed, the pixel sensing order can be changed accordingly. For example, as shown in Figure 8, under the control of the gate driving circuit 12, the p00 sensing pixel 111 is used as the starting point for sensing pixels and the p44 sensing pixel 111 is used as the end point sensing pixel, and then p00àp70, The order of p70àp71, p77àp07, p07àp01, p01àp61, p61àp66, p66àp16, p16àp12, p12àp52, p52àp55, p55àp25, p25àp23, p23àp43, p43àp44, p44àp34 drives each pixel one by one. After changing the first encryption configuration parameter, the second encryption configuration parameter stored in the second encryption unit 16 must be changed accordingly. In this way, the readout circuit 13 can read out the M×N pixel values from the M×N sensing pixels 111 according to the correct sensing data reading sequence. It should be understood that the sensing data reading sequence is also p00àp70, p70àp71, p77àp07, p07àp01, p01àp61, p61àp66, p66àp16, p16àp12, p12àp52, p52àp55, p55àp25, p25àp23, p23àp43, p43àp4 4. p44àp34.

In this way, the above has completely and clearly explained the fingerprint collection device with fingerprint data encryption function of the present invention and the encrypted fingerprint collection method applied thereto; and, from the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a fingerprint collection device and method with fingerprint data encryption function, which uses the method of changing the configuration parameters stored in the register to randomly change the order of M×N sensing pixels to perform pixel sensing. The pixel collection sequence of the fingerprint is changed, thereby achieving the beneficial effect of fingerprint data encryption.

(2) The present invention also discloses an information processing device, which is characterized by including the fingerprint collection device with fingerprint data encryption function of the present invention as described above. Moreover, the information processing device is selected from the group consisting of smart phones, smart watches, smart TVs, tablet computers, notebook computers, all-in-one computers, access control devices, electronic door locks, ATMs, and fingerprint punch cards. An electronic device in a group of machines.

It must be emphasized that the foregoing disclosed in this case are preferred embodiments. Any partial changes or modifications derived from the technical ideas of this case and easily inferred by those familiar with the art do not deviate from the patent of this case. category of rights.

To sum up, regardless of the purpose, means and effects of this case, it shows that it is completely different from the conventional technology, and that the invention is practical first, and indeed meets the patent requirements for inventions. I sincerely ask the review committee to take a clear look and grant the patent as soon as possible for your benefit. Society is a prayer for the Supreme Being.

1a: Capacitive fingerprint collection device 11a: Sensor array 111a: Sensing capacitor 12a: Gate drive circuit 13a: Readout circuit 14a: Control and processing unit 1: Fingerprint collection device 11: Sensor array 111: Sensing pixel 12: Gate drive circuit 13: Readout circuit 14:Control and processing unit 15: First encryption unit 16: Second encryption unit S1: The control and processing unit 14 sets a first encryption configuration parameter in the first encryption unit 15 and sets a second encryption configuration parameter in the second encryption unit 16 S2: The first encryption unit 15 generates and transmits a first enable signal to the gate drive circuit 12 according to the first encryption configuration parameter, thereby controlling the gate drive circuit 12 to drive M×N according to a pixel sensing sequence. The sensing pixels are used for pixel sensing S3: The second encryption unit 16 generates and transmits a second enable signal to the readout circuit 13 according to the second encryption configuration parameter, thereby controlling the readout circuit 13 to read out the M× data in a sensing data sequence. N sensing pixels read out M×N pixel values S4: The control and processing unit 14 generates an encrypted fingerprint image based on the M×N pixel values.

Figure 1 is a structural diagram of a conventional capacitive fingerprint identification device; Figure 2 is a block diagram of the sensor array shown in Figure 1; Figure 3 is a schematic diagram of a sensor array controlled for fingerprint pixel sensing; Figure 4 is a block diagram of a fingerprint collection device according to the present invention; Figure 5 is a block diagram of the sensor array shown in Figure 4; Figure 6 is a flow chart of an encrypted fingerprint collection method of the present invention; Figure 7 is a first schematic diagram of a sensor array controlled for fingerprint pixel sensing; and Figure 8 is a second schematic diagram of a sensor array controlled for fingerprint pixel sensing.

1: Fingerprint collection device

11: Sensor array

111: Sensing pixel

12: Gate drive circuit

13: Readout circuit

14:Control and processing unit

15: First encryption unit

16: Second encryption unit

Claims (11)

A fingerprint collection device includes: a sensor array including M×N sensing pixels, where M and N are both positive integers; a gate drive circuit coupled to the sensor array; a readout circuit coupled connected to the sensor array; a first encryption unit coupled to the gate driving circuit; a second encryption unit coupled to the readout circuit; and a control and processing unit coupled to the first encryption unit, the the second encryption unit and the readout circuit; and wherein, when performing a fingerprint collection operation, the control and processing unit sets a first encryption configuration parameter in the first encryption unit, and in the second encryption unit Set a second encryption configuration parameter; wherein the first encryption unit generates and sends a first enable signal to the gate drive circuit according to the first encryption configuration parameter, thereby controlling the gate drive circuit to sense a pixel M×N sensing pixels are sequentially driven to perform pixel sensing, and the second encryption unit generates and transmits a second enable signal to the readout circuit according to the second encryption configuration parameter, thereby controlling the readout circuit. M×N pixel values are read out from the M×N sensing pixels in a sensing data reading sequence. The fingerprint collection device of claim 1, wherein both the first encryption unit and the second encryption unit are a register. The fingerprint collection device of claim 1, wherein the control and processing unit, the first encryption unit and the second encryption unit are integrated into a single microcontroller chip. The fingerprint collection device of claim 1, wherein the sensor array is selected from the group consisting of an optical fingerprint sensor array, a pressure fingerprint sensor array, an ultrasonic fingerprint sensor array, and a capacitive fingerprint sensor array. Any one in a group of fingerprint sensor arrays. A fingerprint collection device has a sensor array, a gate drive circuit and a readout circuit, characterized in that: the gate drive circuit drives the sensor array according to a specified column drive sequence, and the readout circuit The circuit reads the sensor array according to a specified row reading sequence, wherein the specified row reading sequence is matched with the specified column driving sequence to cause one frame of the sensor array to sense an image Multiple pixel values are output sequentially in a specified row and column coordinates. An encrypted fingerprint collection method is applied in a fingerprint collection device, wherein the fingerprint collection device includes a gate drive circuit, a readout circuit, a sensor array including M×N sensing pixels, A first encryption unit, a second encryption unit, and a control and processing unit, and the fingerprint collection device executes the encrypted fingerprint collection method to implement a fingerprint collection operation; where M and N are both positive integers, and The encrypted fingerprint collection method includes the following steps: the control and processing unit sets a first encryption configuration parameter in the first encryption unit, and sets a second encryption configuration parameter in the second encryption unit; The first encryption unit generates and transmits a first enable signal to the gate drive circuit according to the first encryption configuration parameter, thereby controlling the gate drive circuit to drive M×N sensors in a pixel sensing sequence. The pixel performs pixel sensing; the second encryption unit generates and transmits a second enable signal to the readout circuit according to the second encryption configuration parameter, thereby controlling the readout circuit to read out the M data in a sensing data sequence. The ×N sensing pixels read out M×N pixel values; and the control and processing unit generates an encrypted fingerprint image based on the M×N pixel values. The encrypted fingerprint collection method as claimed in claim 6, wherein both the first encryption unit and the second encryption unit are a register. The encrypted fingerprint collection method of claim 6, wherein the control and processing unit, the first encryption unit and the second encryption unit are integrated into a single microcontroller chip. The encrypted fingerprint collection method as described in claim 6, wherein the sensor array is selected from the group consisting of an optical fingerprint sensor array, a pressure fingerprint sensor array, an ultrasonic fingerprint sensor array, Any one of the group consisting of a capacitive fingerprint sensor array. An information processing device, characterized in that it includes a fingerprint collection device as described in any one of claims 1 to 5. The information processing device as described in claim 10, wherein the information processing device is selected from the group consisting of smart phones, smart watches, smart TVs, tablet computers, notebook computers, all-in-one computers, access control devices, electronic It is an electronic device among the group consisting of door locks, ATMs, and fingerprint punch machines.