TWI709920B - Circuit and information processing device for accelerating fingerprint unlocking - Google Patents

Abstract

The present invention mainly discloses a circuit for accelerating fingerprint unlocking, which is applied to an electronic device having an application processor, a touch chip, a fingerprint recognition chip, a display driver chip, and a flash memory chip, and includes a logic unit, A first signal selection unit and a second signal selection unit. In the case of applying the circuit for accelerating fingerprint unlocking of the present invention, the fingerprint recognition chip can simultaneously perform fingerprint image acquisition during the process of waking up the application processor, so that the application processor can directly read the fingerprint image after being awakened. Image collection data, in this way, the dormant electronic device is quickly awakened and fingerprint unlocked.

Description

Circuit and information processing device for accelerating fingerprint unlocking

The present invention relates to the technical field of electronic devices with both touch function and fingerprint identification function, in particular to a circuit for accelerating fingerprint unlocking and an information processing device with the circuit for accelerating fingerprint unlocking.

It is known that smart phones are indispensable electronic products for modern people. In addition to the most basic touch functions and display functions, some mid-to-high-end smartphones further have fingerprint recognition functions. Therefore, mid-to-high-end smart phones usually must be equipped with an application processor, a display driver chip, a touch chip, and a fingerprint recognition chip, so that the smart phone can realize the touch function, display function and fingerprint recognition function together.

FIG. 1 is a circuit block diagram of an application processor, a display driver chip, a touch chip, and a fingerprint recognition chip included in a conventional smart phone. As shown in Figure 1, the application processor 1'is mainly used to run a mobile phone operating system and through an IIC (Inter-integrated circuit) main control interface 11', an SPI (Serial peripheral interface) main control interface 12' and a The MIPI (Mobile Industry Processor Interface) main control interface 13' sends instructions to the touch chip 2', the fingerprint recognition chip 3', and the display driver chip 4'respectively. Correspondingly, the touch chip 2'has an IIC controlled interface 21', the fingerprint identification chip 3'has an SPI controlled interface 31', and the display driver chip 4'has an MIPI controlled interface 41'.

It is added that the Serial Peripheral Interface (SPI) is a four-wire full-duplex communication bus (Bus), which has the advantage of faster communication speed, so it is often used in smart phones to benefit the application processor. 1 '(Ie, the main control chip) and the fingerprint recognition chip 3'for communication and data transmission. The integrated circuit interface (IIC) is also a serial communication bus (Bus), which is mainly used to connect the application processor 1'to some controlled chips at low speed, such as the touch chip 2'shown in FIG. Furthermore, the Mobile Industry Processor Interface (MIPI) is a special interface used to realize high-speed data transmission, for example, between the display driver chip 4'and the application processor 1'.

In the process of implementing the fingerprint unlocking technology, as shown in Figure 1, the application processor 1'communicates with the touch chip 2'through the IIC protocol, communicates with the fingerprint recognition chip 3'through the SPI protocol, and communicates with the display driver chip 4 through the MIPI protocol. 'Communication. When the touch chip 2'detects that the finger touches the screen of the smart phone, it uploads the touch coordinates of the finger to the application processor 1'through the IIC protocol. After that, the application processor 1'sends an instruction to the display driver chip 4'through the MIPI protocol, and then displays a background image for assisting fingerprint recognition on the corresponding position of the screen. Continuing, the application processor 1'transmits a fingerprint collection coordinate and a fingerprint collection instruction to the fingerprint recognition chip 3'through the SPI protocol, and reads the fingerprint image after the fingerprint recognition chip 3'completes a fingerprint collection operation. Finally, after feature extraction and feature matching are performed on the collected fingerprint image, the application processor 1'will only allow the screen to be unlocked when the fingerprint feature is consistent with a pre-stored template fingerprint feature.

In more detail, as shown in FIG. 1, in addition to the IIC controlled interface 21', the touch chip 2'also includes an INT interface 22' for performing an external interrupt wake-up on the application processor 1'. On the other hand, since the touch chip 2'is mainly used to perform touch sensing and determine whether there is a finger touch and the position of the finger according to the sensing signal, a microprocessor 23' is usually provided inside the touch chip 2' Perform a touch detection algorithm. Currently, the touch chip 2'is usually connected to an external flash memory chip 5'; as shown in FIG. 1, the touch chip 2'is also coupled to the flash memory chip 5 through an SPI master interface 24' 'An SPI controlled interface 51'. With this configuration, when the touch detection algorithm is executed, the microprocessor 23' can load the relevant executable file from the flash memory chip 5'. In addition, the touch control chip 2'also has several General Purpose Input/Output (GPIO) 25'.

However, for a smart phone with an application processor 1', a touch chip 2', a fingerprint recognition chip 3', and a display driver chip 4'as shown in FIG. 1, during the sleep unlocking process using fingerprint recognition The following defects will be displayed. When the smart phone is in the sleep state, after the touch chip 2'detects that the finger touches the screen, it will use its INT interface 22' to wake up the application processor 1'by an external interrupt. It is worth noting that for low-end smartphones, the relatively low-performance application processor 1'usually has a longer wake-up time; therefore, practical experience shows that it takes a finger to touch the screen to complete the screen unlocking It takes 700 microseconds to 800 microseconds, resulting in poor user experience (UX).

It can be seen from the above description that a circuit for accelerating fingerprint unlocking is urgently needed in the art.

The main purpose of the present invention is to provide a circuit for accelerating fingerprint unlocking, which is integrated in an electronic device such as a smart phone to realize rapid wake-up of the electronic device and unlock the screen through fingerprint recognition. In the case of applying the circuit for accelerating fingerprint unlocking of the present invention, the fingerprint recognition chip can simultaneously perform fingerprint image acquisition during the process of waking up the application processor, so that the application processor can directly read the fingerprint image after being awakened. Image collection data, in this way, the dormant electronic device is quickly awakened and fingerprint unlocked.

To achieve the above objective, the present invention proposes an embodiment of the circuit for accelerating fingerprint unlocking, which is applied to an information processing device with touch function and fingerprint recognition function, and the information processing device has an application processor, A touch chip, a fingerprint recognition chip, a display driver chip, and a flash memory chip; the circuit for accelerating fingerprint unlocking includes:

A logic unit for coupling a serial control signal transmitted from the touch chip and a first serial signal transmitted by a first universal input and output interface of the touch chip, and then according to the first serial Line signal outputting the serial control signal or shielding the serial control signal;

A first signal selection unit for receiving the serial control signal transmitted by the logic unit, and at the same time being coupled to a second serial signal transmitted by a second universal input and output interface of the touch chip, Further transmitting the serial control signal to the flash memory chip or the display driver chip according to the second serial signal; and

A second signal selection unit for coupling the serial control signal and a first SPI signal transmitted from the touch chip, the first serial signal transmitted by the first universal input output interface, and A second SPI signal of the application processor, further transmitting the first SPI signal or the second SPI signal to the fingerprint recognition chip according to the first serial signal and the serial control signal;

Wherein, the display driver chip is coupled to the first SPI signal and a third serial signal transmitted by a third universal input and output interface of the touch chip, and the flash memory chip is coupled to the third serial signal transmitted from the The third SPI signal of the touch chip.

In possible embodiments, the logic unit may be an OR gate or an AND gate.

In an embodiment, the first signal selection unit is a first multiplexer, and the second signal selection unit is a second multiplexer.

In one embodiment, when the third serial signal rises to a high level and the first serial signal and the second serial signal both fall to a low level, the second signal selection unit applies The second SPI signal of the processor is transmitted to the fingerprint recognition chip, and the first signal selection unit transmits the serial control signal of the touch chip to the display driving chip.

In one embodiment, when the second serial signal rises to a high level and the first serial signal and the third serial signal both fall to a low level, the second signal selection unit applies The second SPI signal of the processor is transmitted to the fingerprint recognition chip, and the first signal selection unit transmits the serial control signal of the touch chip to the flash memory chip.

In one embodiment, when the third serial signal drops to a low level, the display driver chip performs high-speed data transmission with the application processor through the MIPI protocol; and, when the third serial signal rises to a high level In the case of the level, the touch control chip controls the display driver chip to display a background image for assisting fingerprint recognition on a screen of the information processing device.

In one embodiment, when the first serial signal rises to a high level and the second serial signal and the third serial signal both fall to a low level, the second signal selection unit touches The first SPI signal of the control chip is transmitted to the fingerprint recognition chip, the logic unit shields the serial control signal, and the display driver chip performs high-speed data transmission with the application processor through the MIPI protocol.

In one embodiment, the third serial signal, the first serial signal, and the second serial signal are configured by a microprocessor of the touch chip to rise to a high level or fall to a low level.

The present invention also provides an information processing device, which includes an application processor, a touch chip, a fingerprint recognition chip, a display driver chip, and a flash memory chip, and further includes the accelerated fingerprint unlocking as described above Circuit.

In possible embodiments, the information processing device may be a smart phone, a tablet computer, a notebook computer with a touch screen, an all-in-one computer, a smart watch, or an access control device with a touch screen.

In order to enable your reviewer to further understand the structure, features, purpose, and advantages of the present invention, the drawings and detailed descriptions of preferred specific embodiments are attached as follows.

Fig. 2 shows a functional block diagram of a smart phone including a circuit for accelerating fingerprint unlocking of the present invention. As shown in FIG. 2, the smart phone includes a number of important chips, including: an application processor 1, a touch chip 2, a fingerprint recognition chip 3, a display driver chip 4, and a flash memory chip 5. Wherein, the application processor 1 communicates with an IIC controlled interface 20 of the touch chip 2 through an IIC main control interface 11, and an MIPI main control interface 12 and a MIPI controlled interface of the display driver chip 4 41 for high-speed data transmission. On the other hand, the flash memory chip 5 has an SPI controlled interface 51, and the fingerprint identification chip 3 also has an SPI controlled interface 31. Furthermore, the display driver chip 4 also has an electrical connection interface 42 for performing serial communication.

It is worth noting that, in addition to the IIC controlled interface 20, the touch chip 2 also includes a microprocessor 21, an SPI master interface 22, a first universal input output interface 23, and a second universal input output interface 24. , A third universal input and output interface 25, and an INT interface 26. The circuit for accelerating fingerprint unlocking of the present invention is planned to be arranged between the touch chip 2, the fingerprint recognition chip 3, the display driver chip 4, the flash memory chip 5, and the application processor 1 to pass through The first universal input output interface 23, the second universal input output interface 24, and the third universal input output interface 25 of the touch chip 2 are configured or changed at a high level or a low level, so that the touch chip 2 When the application processor 1 is awakened by an external interrupt via its INT interface 26, the fingerprint recognition chip 3 can be simultaneously controlled to perform fingerprint collection operations, so that the application processor 1 can directly read the fingerprint image after being awakened. Collect data, and use fingerprint recognition technology to wake up and unlock the screen of the electronic device that enters the sleep state.

As shown in FIG. 2, the circuit for accelerating fingerprint unlocking of the present invention includes: a logic unit 61, a first signal selection unit 62, and a second signal selection unit 63, wherein the logic unit 61 is used to couple the touch A serial control signal SPI_CS transmitted by the SPI main control interface 22 of the control chip 2 and a first serial signal GPIO1 transmitted by the first general-purpose input and output interface 23, and then according to the first serial signal GPIO1 The serial control signal SPI_CS is outputted or the serial control signal SPI_CS is shielded. For example, the logic unit 61 can be an OR gate or an AND gate.

The first signal selection unit 62 is used to receive the serial control signal SPI_CS transmitted by the logic unit 61, and at the same time is coupled to a second serial signal GPIO2 transmitted by the second universal input output interface 24, and then The serial control signal SPI_CS is transmitted to the SPI controlled interface 51 of the flash memory chip 5 or the electrical connection interface 42 of the display driver chip 4 according to the second serial signal GPIO2. On the other hand, the second signal selection unit 63 is used to couple the serial control signal SPI_CS transmitted by the SPI main control interface 22 of the touch chip 2 and a first SPI signal, which is output from the first universal input and output. The first serial signal GPIO1 transmitted by the interface 23 and a second SPI signal transmitted by the SPI main control interface 13 of the application processor 1. After that, the second signal selection unit 63 transmits the first SPI signal or the second SPI signal to the SPI controlled interface 31 of the fingerprint recognition chip 3 according to the first serial signal GPIO1 and the serial control signal SPI_CS .

It is supplemented that the first signal selection unit 62 is a first multiplexer, and the second signal selection unit 63 is a second multiplexer. In addition, as shown in FIG. 2, the display driver chip 4 is coupled to a first SPI signal transmitted by the SPI master interface 22 of the touch chip 2 and a third SPI signal transmitted by the third universal input output interface 25. Serial signal GPIO0, and the SPI master interface 22 of the touch chip 2 simultaneously transmits a third SPI signal to the SPI controlled interface 51 of the flash memory chip 5.

3A shows the first circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention. When the smartphone operates in a normal working mode (or called bright screen mode), as shown in FIG. 3A, the microprocessor 21 of the touch chip 2 causes the second serial signal GPIO2 to rise to a high level and causes the first Both the serial signal GPIO1 and the third serial signal GPIO0 fall to a low level. That is, GPIO0=0, GPIO1=0, and GPIO2=1. In this case, the second signal selection unit 63 (that is, the second multiplexer) transmits the second SPI signal of the application processor 1 to the fingerprint recognition chip 3, and the first signal selection unit 62 (That is, the first multiplexer) transmits the serial control signal SPI_CS of the touch chip 2 to the flash memory chip 5. At the same time, since the third serial signal GPIO0 is at a low level (ie, GPIO0=0), the display driver chip 4 performs high-speed data transmission with the application processor 1 through the MIPI protocol. Simply put, after the microprocessor 21 of the touch control chip 2 is configured (GPIO0, GPIO1, GPIO2)=(0, 0, 1), the touch control chip 2 passes through the SPI master interface 22 and the SPI controlled interface 51 The flash memory chip 5 is accessed. At the same time, the application processor 1 controls the fingerprint identification chip 3 to perform fingerprint collection operations through the SPI master control interface 13 and the SPI controlled interface 31, and the application processor 1 also communicates with the fingerprint recognition chip 3 through the MIPI master control interface 12 and the MIPI controlled interface 41 The display driver chip 4 performs high-speed data transmission.

3B shows the second circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention. When the smart phone operates in a sleep wake-up mode, as shown in FIG. 3B, the microprocessor 21 of the touch chip 2 causes the third serial signal GPIO0 to rise to a high level, and causes the first serial signal GPIO1 and the The second serial signal GPIO2 drops to a low level. That is, GPIO0=1, GPIO1=0, and GPIO2=0. In this case, the second signal selection unit 63 (that is, the second multiplexer) transmits the second SPI signal of the application processor 1 to the fingerprint recognition chip 3, and the first signal selection unit 62 (That is, the first multiplexer) transmits the serial control signal SPI_CS of the touch chip 2 to the display driver chip 4. At the same time, since the third serial signal GPIO0 is at a high level (that is, GPIO0=1), the touch chip 2 controls the display driver chip 4 through the SPI main control interface 22 and the electrical connection interface 42 to make the display driver chip 4 Display a background image for assisting fingerprint recognition on the corresponding position (ie, the touch position) on the screen of the electronic device. Simply put, when the smart phone sleeps, the microprocessor 21 of the touch chip 2 configures (GPIO0, GPIO1, GPIO2)=(1, 0, 0). With this configuration, when the screen of the electronic device is touched by a finger, the touch chip 2 can also control the display driver chip 4 to display for assistance at the same time when the application processor 1 is awakened by an external interrupt via its INT interface 26 The background picture for fingerprint recognition is helpful for the fingerprint recognition chip 3 to perform fingerprint collection operations.

3C shows the third circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention. After the display driver chip 4 drives the screen of the electronic device to display a frame of image (that is, a background image for assisting fingerprint recognition), as shown in FIG. 3C, the microprocessor 21 of the touch chip 2 makes the first string The row signal GPIO1 rises to a high level, and both the second serial signal GPIO2 and the third serial signal GPIO0 fall to a low level. That is, GPIO0=0, GPIO1=1, and GPIO2=0. In this case, the touch chip 2 controls the fingerprint identification chip 4 to perform a fingerprint collection operation through the SPI master control interface 22 and the SPI controlled interface 31.

3D shows the fourth circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention. After the fingerprint recognition chip 4 completes the fingerprint collection operation, as shown in FIG. 3D, the microprocessor 21 of the touch chip 2 causes the third serial signal GPIO0 to drop to a low level, and causes the first serial The signal GPIO1 and the second serial signal GPIO2 both rise to a high level. That is, GPIO0=0, GPIO1=1, and GPIO2=1. In this case, the application processor 1 controls the fingerprint identification chip 3 through the SPI master control interface 13 and the SPI controlled interface 31. Simply put, after the application processor 1 is successfully awakened, the application processor 1 can directly read the collected data of the fingerprint image. Finally, after feature extraction and feature matching are performed on the collected fingerprint images, the application processor 1 will only allow the screen to be unlocked when the fingerprint features are consistent with the fingerprint features of a pre-stored template. The fingerprint recognition technology wakes up and unlocks the screen of the electronic device that enters the sleep state.

In this way, the above has completely and clearly explained a circuit for accelerating fingerprint unlocking of the present invention; and from the above, it can be seen that the present invention has the following advantages:

The present invention discloses a circuit for accelerating fingerprint unlocking, which is applied to an electronic device having an application processor, a touch chip, a fingerprint recognition chip, a display driver chip, and a flash memory chip. In the case of applying the circuit for accelerating fingerprint unlocking of the present invention, the fingerprint recognition chip can simultaneously perform fingerprint image acquisition during the process of waking up the application processor, so that the application processor can directly read the fingerprint image after being awakened. Image collection data, in this way, the dormant electronic device is quickly awakened and fingerprint unlocked.

It must be emphasized that the foregoing disclosures in this case are preferred embodiments, and any partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those who are familiar with the art will not deviate from the patent of this case. Right category.

In summary, regardless of the purpose, means and effects of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. Please check it out and grant the patent as soon as possible. Society is for the best prayer.

<The present invention>

1: Application processor

11: IIC main control interface

12: MIPI main control interface

2: Touch chip

20: IIC controlled interface

21: Microprocessor

13, 22: SPI master interface

23: The first universal input and output interface

24: The second universal input and output interface

25: The third universal input and output interface

26: INT interface

3: Fingerprint recognition chip

4: Display driver chip

41: MIPI controlled interface

42: Electrical connection interface

5: Flash memory chip

31, 51: SPI controlled interface

61: Logic Unit

62: The first signal selection unit

63: The second signal selection unit

＜Actually knowledge＞

1’: Application processor

11’: IIC main control interface

12’, 24’: SPI master interface

13’: MIPI main control interface

2’: Touch chip

21’: IIC controlled interface

22’: INT interface

23’: Microprocessor

25’: Universal input and output interface

3’: Fingerprint recognition chip

31’, 51’: SPI controlled interface

4’: Display driver chip

41’: MIPI controlled interface

5’: Flash memory chip

Fig. 1 is a circuit block diagram of an application processor, a display driver chip, a touch chip, and a fingerprint recognition chip included in a conventional smart phone; 2 is a functional block diagram of a smart phone circuit including a circuit for accelerating fingerprint unlocking of the present invention; 3A is a first circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention; 3B is a second circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention; 3C is a third circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention; and 3D is a fourth circuit operation diagram of the circuit for accelerating fingerprint unlocking of the present invention.

1: Application processor

11: IIC main control interface

12: MIPI main control interface

13, 22: SPI master interface

2: Touch chip

20: IIC controlled interface

21: Microprocessor

23: The first universal input and output interface

24: The second universal input and output interface

25: The third universal input and output interface

26: INT interface

3: Fingerprint recognition chip

31, 51: SPI controlled interface

4: Display driver chip

41: MIPI controlled interface

42: Electrical connection interface

5: Flash memory chip

61: Logic Unit

62: The first signal selection unit

63: The second signal selection unit

Claims (10)

A circuit for accelerating fingerprint unlocking is applied to an information processing device with touch function and fingerprint recognition function, and the information processing device has an application processor, a touch chip, a fingerprint recognition chip, and a display drive chip And a flash memory chip; the circuit for accelerating fingerprint unlocking includes: a logic unit for coupling a serial control signal transmitted from the touch chip and a first universal input/output from the touch chip A first serial signal transmitted by the interface, and then output the serial control signal or shield the serial control signal according to the first serial signal; a first signal selection unit for receiving the logic unit The serial control signal transmitted is coupled to a second serial signal transmitted by a second universal input and output interface of the touch chip at the same time, and the serial control signal is further transferred according to the second serial signal Transmitted to the flash memory chip or the display driver chip; and a second signal selection unit for coupling the serial control signal and a first SPI signal transmitted from the touch chip to the first universal The first serial signal transmitted by the input and output interface and a second SPI signal transmitted from the application processor, and then the first SPI signal or the second SPI signal is transmitted according to the first serial signal To the fingerprint recognition chip; wherein the display driver chip is coupled to the first SPI signal and a third serial signal transmitted by a third universal input and output interface of the touch chip, and the flash memory The chip is coupled to the third SPI signal transmitted from the touch chip. For example, the circuit for accelerating fingerprint unlocking described in item 1 of the scope of patent application, wherein the logic unit is an OR gate or a gate. According to the circuit for accelerating fingerprint unlocking as described in claim 1, wherein, the first signal selection unit is a first multiplexer, and the second signal selection unit is a second multiplexer. The circuit for accelerating fingerprint unlocking as described in item 1 of the scope of patent application, wherein, when the third serial signal rises to a high level and the first serial signal and the second serial signal both fall to a low level In this case, the second signal selection unit transmits the second SPI signal of the application processor to The fingerprint recognition chip, and the first signal selection unit transmits the serial control signal of the touch chip to the display driving chip. The circuit for accelerating fingerprint unlocking as described in item 1 of the scope of patent application, wherein, when the second serial signal rises to a high level and the first serial signal and the third serial signal both fall to a low level In this case, the second signal selection unit transmits the second SPI signal of the application processor to the fingerprint recognition chip and the first signal selection unit transmits the serial control signal of the touch chip to the flash memory Body chip. The circuit for accelerating fingerprint unlocking described in item 5 of the scope of patent application, wherein, when the third serial signal drops to a low level, the display driver chip performs high-speed data transmission with the application processor through the MIPI protocol Wherein, when the third serial signal rises to a high level, the touch chip controls the display driver chip to display a background image for assisting fingerprint recognition on a screen of the information processing device. The circuit for accelerating fingerprint unlocking described in item 6 of the scope of patent application, wherein, when the first serial signal rises to a high level and the second serial signal and the third serial signal both fall to a low level In this case, the second signal selection unit transmits the first SPI signal of the touch chip to the fingerprint recognition chip, the logic unit shields the serial control signal, and the display driver chip processes the application with the MIPI protocol The device performs high-speed data transmission. The circuit for accelerating fingerprint unlocking as described in item 4 of the scope of patent application, wherein the third serial signal, the first serial signal and the second serial signal are configured by a microprocessor of the touch chip It rises to the high level or falls to the low level. An information processing device, which includes an application processor, a touch chip, a fingerprint recognition chip, a display driver chip, and a flash memory chip, and further includes any of the first to eighth patent applications A circuit that speeds up fingerprint unlocking. The information processing device described in item 9 of the scope of patent application, wherein the information processing device is selected from smart phones, tablet computers, notebook computers with touch screens, all-in-one computers, smart watches, An electronic device in the group consisting of an access control device with a touch screen.

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