TWI612478B - Fingerprint identification system, a driving circuit and a fingerprint identification method - Google Patents

Abstract

The invention provides a fingerprint identification system. The fingerprint identification system includes a sensing panel and a driving circuit. The sensing panel includes a plurality of sensors. The sensor transmits the sensing signal and the reference signal respectively through the two signal transmission paths. The driving circuit is coupled to the sensing panel. The driving circuit is configured to drive the sensing panel, and perform fingerprint identification operations according to the sensing signal and the reference signal. The sensing signal and the reference signal form a differential signal pair. The driving circuit generates a fingerprint identification signal according to the sensing signal and the reference signal. A driving circuit and a fingerprint identification method are also proposed.

Description

Fingerprint identification system, driving circuit and fingerprint identification method

The invention relates to a fingerprint identification technology, and in particular to a fingerprint identification system, a driving circuit and a fingerprint identification method.

In the technical field of fingerprint identification, fingerprint identification technology can be divided into optical, thermal, ultrasonic and capacitive, and these fingerprint identification technologies have different applications and combinations in various electronic devices. In particular, the capacitive fingerprint identification technology has been widely used at present, and the fingerprint identification method is to identify the fingerprint roughness change to obtain fingerprint information. Since the fingerprint has different embossed lines, when the fingerprint contacts the sensing panel, the capacitance values of the different sensing regions on the sensing panel will respectively change corresponding to the different lines touched, wherein the concave portion of the fingerprint has a capacitance value Small, and the capacitance value induced in the convex portion of the fingerprint is large. However, the variation of the fingerprint's texture is quite small, and the capacitance value induced on the sensing panel may be only 0.1 Farad and 1 Farad. Therefore, when fingerprint recognition occurs, if there is noise interference, the fingerprint identification system receives the sensing signal about the change of the capacitance value to analyze the change of the capacitance value, and is susceptible to the influence of the noise, resulting in the misjudgment of the signal. Affect the accuracy of fingerprint identification. Therefore, how to overcome noise interference to improve the accuracy of fingerprint identification is a very important topic at present.

The invention provides a fingerprint identification system, a driving circuit and a fingerprint identification method, which can effectively solve the noise interference of the signal on the signal transmission path.

A fingerprint identification system of the present invention includes a sensing panel and a driving circuit. The sensing panel includes a plurality of sensors, wherein each sensor transmits the sensing signal and the reference signal respectively via the two signal transmission paths. The driving circuit is coupled to the sensing panel for driving the sensing panel. The driving circuit performs a fingerprint identification operation according to the sensing signal and the reference signal, wherein the sensing signal and the reference signal form a differential signal pair. The driving circuit generates a fingerprint identification signal according to the sensing signal and the reference signal.

In an embodiment of the invention, each of the sensors respectively connects the two signal transmission paths via the two switching elements. The two switching elements are used to perform the same switching operation, wherein the sensors respectively correspond to the plurality of sensing regions of the sensing panel. Each sensor determines whether to output a capacitance value corresponding to the sensing region by one of the two switching elements.

In an embodiment of the invention, the two signal transmission paths are symmetrically configured to have the same equivalent load.

In an embodiment of the invention, the sensing signal is determined according to a capacitance value and a parasitic capacitance value of one of the two signal transmission paths.

In an embodiment of the invention, the reference signal is determined according to a parasitic capacitance value of the other of the two signal transmission paths.

In an embodiment of the invention, the driving circuit includes a signal processing circuit. The signal processing circuit is configured to receive the sensing signal and the reference signal, and perform a difference operation according to the sensing signal and the reference signal to obtain the fingerprint identification signal.

In an embodiment of the invention, the signal processing circuit is a differential amplifier circuit.

In an embodiment of the invention, the driving circuit further includes a voltage supply circuit. The voltage supply circuit is coupled to the two signal transmission paths through two resistors. The voltage supply circuit is used to provide the same bias voltage to the two signal transmission paths to drive the sensing panel.

A driving circuit of the present invention is suitable for driving a sensing panel, wherein the sensing panel includes a plurality of sensors and two signal transmission paths. The drive circuit includes a signal processing circuit. The signal processing circuit is coupled to the sensing panel. The signal processing circuit is configured to receive the sensing signal and the reference signal respectively through the two signal transmission paths, and perform fingerprint identification operations according to the sensing signal and the reference signal. The sensing signal and the reference signal form a differential signal pair. The driving circuit generates a fingerprint identification signal according to the sensing signal and the reference signal.

In an embodiment of the invention, the sensor is connected to the two signal transmission paths via the two switching elements. The two switching elements are used to perform the same switching operation, wherein the sensors respectively correspond to the plurality of sensing regions of the sensing panel. Each sensor determines whether to transmit the capacitance value of the corresponding sensing region by one of the two switching elements.

In an embodiment of the invention, the two signal transmission paths are symmetrically configured to have the same equivalent load.

In an embodiment of the invention, each of the sensors is configured to sense a capacitance value of a corresponding sensing region. The sensing signal is determined according to the capacitance value and the parasitic capacitance value of one of the two signal transmission paths.

In an embodiment of the invention, the reference signal is determined according to a parasitic capacitance value of the other of the two signal transmission paths.

In an embodiment of the invention, the signal processing circuit is a differential amplifier circuit. The signal processing circuit is configured to receive the sensing signal and the reference signal, and perform a difference operation according to the sensing signal and the reference signal to obtain the fingerprint identification signal.

In an embodiment of the invention, the driving circuit further includes a voltage supply circuit. The voltage supply circuit is coupled to the two signal transmission paths through two resistors. The voltage supply circuit is used to provide the same bias voltage to the two signal transmission paths to drive the sensing panel.

A fingerprint identification method of the present invention is applicable to a sensing panel, wherein the sensing panel includes a plurality of sensors and two signal transmission paths. The fingerprint identification method includes: transmitting the sensing signal and the reference signal by using the two signal transmission paths respectively. Performing a fingerprint identification operation according to the sensing signal and the reference signal to generate a fingerprint identification signal, wherein the sensing signal and the reference signal form a differential signal pair.

In an embodiment of the invention, the plurality of sensors respectively correspond to the plurality of sensing regions of the sensing panel. Each sensor is configured to sense a capacitance value of the corresponding sensing region. The sensing signal is determined according to the capacitance value and the parasitic capacitance value of one of the two signal transmission paths.

In an embodiment of the invention, the reference signal is determined according to a parasitic capacitance value of the other of the two signal transmission paths.

In an embodiment of the invention, the step of performing a fingerprint identification operation by using the driving circuit according to the sensing signal and the reference signal comprises: performing a difference operation according to the sensing signal and the reference signal to obtain the fingerprint identification signal.

Based on the above, the fingerprint identification system transmits the sensing signals forming the differential signal pair and the reference signal to the driving circuit by using the two signal transmission paths disposed in the sensing panel. The driving circuit uses the reference signal to cancel the noise in the sensing signal, thereby effectively solving the noise interference of the signal on the signal transmission path.

The above described features and advantages of the invention will be apparent from the following description.

The term "coupled" as used throughout the specification (including the scope of the patent application) may be used in any direct or indirect connection. For example, if the driving circuit is coupled to the sensing panel, it should be interpreted that the driving circuit can be directly connected to the sensing panel, or the driving circuit can be indirectly connected through other devices, wires or some connection means. To the sensing panel. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

FIG. 1 is a schematic diagram of a fingerprint identification system according to an embodiment of the present invention. Please refer to Figure 1. The fingerprint recognition system 10 of the present embodiment includes a sensing panel 100 and a driving circuit 200. The sensing panel 100 includes a plurality of sensors 110. The sensors 110 correspond to the plurality of sensing regions SR of the sensing panel 100, wherein the sensors 110 sense the capacitance values of the sensing regions SR in a one-to-one manner. Each of the sensors 110 transmits the sensing signal SS and the reference signal FS via the two signal transmission paths 120 and 130, respectively.

In this embodiment, the sensing panel 100 further includes a plurality of switching elements and two signal transmission paths 120 and 130. Each of the sensors 110 respectively connects the two signal transmission paths 120 and 130 via the two switching elements 140 and 150. The switching elements 140, 150 are used to perform the same switching operation, wherein each of the sensors 110 determines whether to transmit the sensed capacitance value by the switching element 140.

In the embodiment, the driving circuit 200 is coupled to the sensing panel 100. The driving circuit 200 is configured to drive the sensing panel 100 and perform a fingerprint identification operation according to the sensing signal SS and the reference signal FS, wherein the sensing signal SS and the reference signal FS form a differential signal pair. The driving circuit 200 generates a fingerprint identification signal FIS according to the sensing signal SS and the reference signal FS. The driving circuit 400 can further output the fingerprint identification signal FIS to the next-stage circuit of the driving circuit 400 (not shown) for the next stage of the fingerprint. Identification, but the invention is not limited.

In this embodiment, the sensor 110 can be a capacitive sensor, and the sensing panel 100 can be a capacitive fingerprint recognition panel, and can also be combined with a touch panel, a display panel, or a touch display panel to have a fingerprint at the same time. Identification and other touch and display functions, but the invention is not limited. In addition, the switching elements 140, 150 may be transmission gates, transistor switches or other switching elements/circuits, and the like.

It should be noted that, in this embodiment, the signal transmission path 130 is not substantially coupled to the sensor 110. Therefore, the reference signal FS transmitted by the signal transmission path 130 does not include the capacitance value of the sensing area SR. In addition, the circuit configuration of the sensor 110 and the range of the sensing area SR of the present embodiment are not limited to those shown in FIG. 1. FIG. 1 is only used to present the configuration relationship of the summary, and the purpose is to express the sensing area SR and signal transmission. The coupling relationship between the paths 120 and 130, wherein the signal transmission path 120 is coupled to the sensor 110 to receive the change in the capacitance value of the sensing region SR sensed by the sensor 110. In contrast, the signal transmission path 130 is not coupled to the sensor 110, wherein the signal transmission path 130 is used to transmit the reference signal FS, and the reference signal FS may correspond to the noise waveform in the sensing signal SS.

Specifically, when the user places a finger on the sensing panel 100 to perform a fingerprint recognition operation, since the plurality of sensing regions SR of the sensing panel 100 respectively correspond to different fingerprint patterns, the sensors 110 may respectively The different capacitance values are sensed, wherein each of the sensors 110 can transmit the sensed capacitance value to the driving circuit 200 via the signal transmission path 120 by means of the switching element 140 in a time-sharing manner, to be performed by the driving circuit 200. Fingerprint recognition operation. However, when the driving circuit 200 receives the capacitance values measured by the sensors 110 through the signal transmission path 120, the driving circuit 200 may further include receiving in the signal transmission path 120 due to parasitic capacitance or other switching elements. The noise generated by the capacitor may even include noise interference caused by other circuit configurations. That is to say, the sensing signal SS can be determined according to the capacitance value measured by each sensor 110 and the parasitic capacitance value in the signal transmission path 120. Therefore, the sensing signal SS received by the driving circuit 200 includes the noise provided by the parasitic capacitance in the signal transmission path 120 in addition to the capacitance value change received by the sensor 110.

In the present embodiment, the driving circuit 200 receives the reference signal FS via the signal transmission path 130. The signal transfer path 130 can be symmetrically configured with the signal transfer path 120 to have the same equivalent load. The switching element 150 and the switching element 140 of each sensor 110 may also be symmetrically arranged and have the same switching operation. Thereby, the transmission path 130 and the signal transmission path 120 will have the same parasitic capacitance effect in order to generate the same noise interference. That is to say, the reference signal FS can be determined according to the parasitic capacitance value of the signal transmission path 130. Therefore, the reference signal FS received by the driving circuit 200 may be the noise provided by the parasitic capacitance in the signal transmission path 130.

It should be noted that, in this embodiment, since the signal transmission path 120 can be symmetrically configured with the signal transmission path 130, the circuits of the signal transmission paths 120 and 130 have the same circuit structure and electronic component layout, for example, having the same number of switches. And the signal transmission paths 120, 130 are in a symmetrical configuration, wherein the switching element 140 performs the same switching operation as the corresponding switch 150. In this embodiment, the difference between the signal transmission paths 120 and 130 is that the signal transmission path 120 transmits the capacitance value sensed by the sensor 110 by the switching action of the plurality of switches 140, and the signal transmission path 130 is coupled to There are a plurality of switches 150 that are symmetrically configured with these switches 140, but these switches 150 do not pass the capacitance values sensed by the sensor 110. One end of the switch 150 is coupled to the signal transmission path 130, and the other end may be grounded, floated, or coupled to a specific voltage level, etc., and the invention is not limited thereto. That is, the sensing signal SS and the reference signal FS have the same noise interference signal, but the sensing signal SS further includes the capacitance value change of the sensor 110. Therefore, the differential signal pair is formed by the sensing signal SS and the reference signal FS, and the driving circuit 200 can receive the difference between the sensing signal SS and the reference signal FS to delete the noise in the sensing signal SS, and obtain fingerprint identification. Signal FIS.

2A is a schematic diagram showing the waveform of a fingerprint identification signal according to an embodiment of the invention. FIG. 2B is a schematic diagram showing the waveform of a sensing signal according to an embodiment of the invention.

The waveform diagram of the sensing signal SS shown in FIG. 2A is a change in the capacitance values 1f and 0.1f and the noise interference caused by the unevenness of the fingerprint. Please refer to FIG. 1 and FIG. 2A. In the embodiment, the driving circuit 200 receives the sensing signal SS via the signal transmission path 120, wherein the sensing signal SS includes the capacitance value measured by the sensors 110 and the parasitic capacitance in the signal transmission path 120 or The noise generated by the capacitance provided by other switching elements. In this embodiment, the change in the capacitance value measured by the sensor 110 in the sensing signal SS and the noise will be mixed. Therefore, another signal transmission path 130 can be disposed in the sensing panel 100 for transmitting the reference signal FS having the same noise as the signal transmission path 120, and the reference signal FS does not include the capacitance measured by the sensor 110. The value changes. Therefore, the driving circuit 200 can perform the difference operation using the reference signal FS and the sensing signal SS to eliminate the noise waveform in the sensing signal SS.

The waveform diagram of the fingerprint identification signal FIS shown in FIG. 2B is a change in the capacitance values 1f and 0.1f caused by the unevenness of the fingerprint. Please refer to FIGS. 1 and 2B. In this embodiment, the driving circuit 200 performs a difference operation using the differential signal pair formed by the sensing signal SS and the reference signal FS, and the noise signal in the sensing signal SS is used by the reference signal FS having the same noise waveform. deduction. Therefore, the driving circuit 200 will obtain, for example, the fingerprint identification signal FIS shown in FIG. 2B. In this embodiment, the fingerprint identification signal FIS will have a waveform change that is clear about the capacitance value of the fingerprint pattern, and can be provided to the next stage circuit of the driving circuit 200. Fingerprint recognition is performed (not shown).

FIG. 3 is a schematic diagram of a fingerprint identification system according to another embodiment of the present invention. Referring to FIG. 3 , the fingerprint identification system 30 of the embodiment includes a sensing panel 300 and a driving circuit 400 . The sensing panel 300 includes a plurality of sensors 310_1~310_N. The sensors 310_1~310_N are respectively corresponding to the plurality of sensing regions SR1 S SRN of the sensing panel 300, and the sensors 310_1~310_N are used to respectively sense the capacitance values of the sensing regions SR1 S SRN, wherein N is a positive integer greater than zero. Each of the sensors 310_1~310_N transmits the sensing signal SS and the reference signal FS via the two signal transmission paths 320 and 330, respectively.

In the embodiment, the sensing panel 300 further includes a plurality of switching elements and two signal transmission paths 320 and 330. The sensors 310_1~310_N are respectively connected to the signal transmission path 320 via the switching elements 340_1~340_N and 350_1~350_N. 330. The corresponding switching elements are respectively used to perform the same switching operation, wherein the sensors 310_1~310_N respectively determine whether to transmit the sensed capacitance value by the switching elements 340_1~340_N.

It should be noted that, in this embodiment, the signal transmission path 330 is not substantially coupled to the sensors 310_1~310_N, so the reference signal FS transmitted by the signal transmission path 330 does not include the capacitance values of the sensing areas SR1~SRN. . In addition, the circuit configuration of the sensors 310_1~310_N and the range of the sensing areas SR1~SRN of the present embodiment are not limited to those shown in FIG. 3. FIG. 3 is only an example schematic diagram, and the purpose is to express the sensing areas SR1~SRN and The signal transmission path 320 is coupled to the sensors 310_1~310_N to receive the capacitance value changes of the sensing regions SR1 S SRN by the sensors 310_1 310 310_N. In contrast, the signal transmission path 330 is not coupled to the sensors 310_1 310 310_N, wherein the signal transmission path 330 is used to transmit the reference signal FS, and the reference signal FS may correspond to the noise waveform in the sensing signal SS.

In addition, the related circuit features, the signal transmission means, the signal processing mode, and the fingerprint identification operation of the sensing panel 300 of the present embodiment can be sufficiently taught, suggested, and implemented by the description of the embodiment of FIG. 1 to FIG. 2B. No longer.

In the present embodiment, the driving circuit 400 includes a signal processing circuit 410, a voltage supply circuit 420, and resistors 430, 440. The signal processing circuit 410 includes a differential amplifier circuit 411 for receiving the sensing signal SS and the reference signal FS transmitted via the signal transmission paths 320, 330, and performing a difference operation to obtain the fingerprint identification signal FIS. And the operation result of the fingerprint identification signal FIS is output to the next-stage circuit (not shown) of the drive circuit 400 for fingerprint recognition in the next stage. However, in another embodiment, the driving circuit 400 may further include an analog/digital conversion circuit 412 for receiving the fingerprint identification signal FIS for analog/digital conversion, and then outputting the conversion result to the next stage circuit of the driving circuit 400. (not shown) to perform the fingerprint recognition operation of the next stage, but the invention is not limited.

In the present embodiment, the voltage supply circuit 420 is coupled to the signal transmission paths 320 and 330 through the two resistors 430 and 440 to provide the same bias voltage to the signal transmission paths 320 and 330 to drive the sensing panel 300. In particular, since the signal transfer paths 320, 330 are symmetrically configured and have the same equivalent load, the voltage supply circuit 420 provides the same bias to the signal transfer paths 320, 330 through the two resistors 430, 440. Thereby, the signal transmission paths 320, 330 can generate the same noise interference or parasitic capacitance effect, so as to use the sensing signal SS and the reference signal FS to form a differential signal pair.

For example, FIG. 4 is a schematic diagram of signals of the fingerprint identification system of the embodiment of FIG. 3. Please refer to Figure 3 and Figure 4. In the embodiment, when the sensor 310_1 turns on the switching element 340_1 to sense the capacitance value of the touch area SR1 of the touch panel 300, the switching elements 340_2 340 340_N may be in a non-conducting state, and the corresponding switch Elements 350_1~350_N are the same switching operation. In other words, the sensor 310_1 transmits the sensed capacitance value C1 to the driving circuit 400 via the signal transmission path 320. In contrast, the switching element 340_1 is also in an on state, but the signal transmission path 330 does not include a signal waveform in which the capacitance value C1 of the touch area SR1 is transmitted.

During the transmission of the signal, the signal transmission path 330 itself or the unsensed sensor 310_2~310_N may have a parasitic capacitance, or may be caused by the capacitance values C2~CN contributed by the switching elements 340_2~340_N themselves. News. Therefore, the signal waveform of the sensing signal SS received by the driving circuit 400 will include the capacitance value change of the touch area SR1 and other noise interference. However, the signal transmission path 330 is symmetrically disposed with the signal transmission path 320 and can be used to generate the same noise interference. Therefore, the reference signal FS received by the driving circuit 400 will include the same signal waveform as the noise interference of the signal transmission path 320.

In other words, in the embodiment, the driving circuit 400 can perform a difference operation according to the differential signal pair formed by the sensing signal SS and the reference signal FS to eliminate noise interference in the sensing signal SS. Therefore, the driving circuit 400 can output the fingerprint identification signal FIS to provide the next stage of the driving circuit 400 (not shown) for the next stage of fingerprint identification, wherein the fingerprint identification signal FIS can be less than the sensing signal SS. Noise interference, even no noise interference.

It should be noted that FIG. 4 is a schematic diagram of the signal. The capacitance value C1 of FIG. 4 represents the capacitance value of the sensing area SR1 of the sensor 310_1, and the capacitance values C2~CN are only used to indicate the signal transmission path 320, 330. And possible equivalent capacitance values of the switching elements 340_1 340 340_N, 350_1 ～ 350_N.

FIG. 5 is a flow chart of a fingerprint identification method according to an embodiment of the invention. Please refer to Figure 1 and Figure 5. The fingerprint identification method of the present embodiment can be applied at least to the fingerprint recognition system 10 of FIG. 1, but the present invention is not limited thereto. In this embodiment, the fingerprint identification method may include at least the following steps. In step S510, the sensor 110 transmits the sensing signal SS and the reference signal FS by using the two signal transmission paths 120 and 130, respectively. In step S510, the driving circuit 200 performs a fingerprint identification operation according to the sensing signal SS and the reference signal FS to generate a fingerprint identification signal FIS, wherein the sensing signal SS and the reference signal FS form a differential signal pair.

In addition, the related circuit features, the signal transmission means, the signal processing mode, and the fingerprint identification operation of the fingerprint identification system 10 of the present embodiment can be sufficiently taught, suggested, and implemented by the description of the embodiment of FIG. 1 to FIG. No longer.

In summary, in the embodiment of the present invention, the fingerprint identification system transmits the sensing signal and the reference signal respectively by using two signal transmission paths disposed in the sensing panel, wherein the fingerprint identification system is symmetrically configured by the two signal transmission paths. The two signal transmission paths have the same load and noise interference, so the sensing signal and the reference signal include the same noise. Thereby, the driving circuit uses the sensing signal and the reference signal to form a differential signal pair for performing the difference calculation, which can effectively eliminate the noise interference of the signal in the signal transmission path, and further obtain the fingerprint identification signal.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10, 30: fingerprint identification system 100, 300: sensing panel 110, 310_1 ~ 310_N: sensor 120, 130, 320, 330: signal transmission path 140, 150, 340_1 ~ 340_N, 350_1 ~ 350_N: switching element 200, 400: drive circuit 410: signal processing circuit 411: differential amplifier circuit 412: analog/digital conversion circuit 420: voltage supply circuit 430, 440: resistor C1 ~ CN: capacitance value FIS: fingerprint identification signal FS: reference signal SR, SR1~SRN: sensing area SS: sensing signal S510, S520: steps

FIG. 1 is a schematic diagram of a fingerprint identification system according to an embodiment of the present invention. 2A is a schematic diagram showing the waveform of a fingerprint identification signal according to an embodiment of the invention. FIG. 2B is a schematic diagram showing the waveform of a sensing signal according to an embodiment of the invention. FIG. 3 is a schematic diagram of a fingerprint identification system according to another embodiment of the present invention. 4 is a schematic diagram of signals of the fingerprint identification system of the embodiment of FIG. 3. FIG. 5 is a flow chart of a fingerprint identification method according to an embodiment of the invention.

30: fingerprint identification system 300: sensing panels 310_1~310_N: sensors 320, 330: signal transmission paths 340_1~340_N, 350_1~350_N: switching element 400: driving circuit 410: signal processing circuit 411: differential amplifier circuit 412 : analog/digital conversion circuit 420: voltage supply circuit 430, 440: resistors SR1 S SRN: sensing area SS: sensing signal FS: reference signal FIS: fingerprint identification signal

Claims (17)

A fingerprint identification system includes: a sensing panel, comprising a plurality of sensors, wherein each of the sensors transmits a sensing signal via one of the two signal transmission paths, and wherein the two signals are transmitted through the two signals The other one transmits a reference signal; and a driving circuit is coupled to the sensing panel for driving the sensing panel, and performing a fingerprint identification operation according to the sensing signal and the reference signal, wherein the sensing signal and The reference signal forms a differential signal pair, and the driving circuit generates a fingerprint identification signal according to the sensing signal and the reference signal, wherein the sensors respectively connect the two signal transmission paths via two switching elements, the two switching elements For performing the same switching operation, wherein the sensors respectively correspond to the plurality of sensing regions of the sensing panel, and each of the sensors determines whether to transmit the corresponding feeling by one of the two switching elements a capacitance value of the measurement area, wherein the reference signal transmitted by the other of the two signal transmission paths does not include the capacitance of the corresponding sensing area . The fingerprint identification system of claim 1, wherein the two signal transmission paths are symmetrically configured to have the same equivalent load. The fingerprint identification system of claim 2, wherein the sensing signal is determined according to the capacitance value and a parasitic capacitance value of one of the two signal transmission paths. The fingerprint identification system of claim 3, wherein the reference signal is determined according to a parasitic capacitance value of the other of the two signal transmission paths. The fingerprint identification system of claim 1, wherein the driving circuit comprises: a signal processing circuit for receiving the sensing signal and the reference signal, and performing a difference according to the sensing signal and the reference signal Value calculation to obtain the fingerprint identification signal. The fingerprint identification system of claim 5, wherein the signal processing circuit comprises a differential amplifier circuit. The fingerprint identification system of claim 5, wherein the driving circuit further comprises: a voltage supply circuit coupled to the two signal transmission paths via two resistors to provide an identical The bias voltage is applied to the two signal transmission paths to drive the sensing panel. A driving circuit is configured to drive a sensing panel, wherein the sensing panel includes a plurality of sensors and two signal transmission paths, and the driving circuit includes: a signal processing circuit coupled to the sensing panel for One of the two signal transmission paths receives a sensing signal, and receives a reference signal through the other of the two signal transmission paths, and performs a fingerprint identification operation according to the sensing signal and the reference signal. The sensing signal and the reference signal form a differential signal pair, and the driving circuit generates a fingerprint identification signal according to the sensing signal and the reference signal, wherein the sensors respectively connect the two signals through the two switching elements a path for the two switching elements to perform a same switching operation, wherein the sensors respectively correspond to the plurality of sensing regions of the sensing panel, and each of the sensors is provided by one of the two switching elements Determining whether to transmit a capacitance value of the corresponding sensing region, wherein the reference signal received by the other of the two signal transmission paths does not include the capacitance value of the corresponding sensing region. The driving circuit of claim 8, wherein the two signal transmission paths are symmetrically configured to have the same equivalent load. The driving circuit of claim 9, wherein the sensing signal is determined according to the capacitance value and a parasitic capacitance value of one of the two signal transmission paths. The driving circuit of claim 10, wherein the reference signal is determined according to a parasitic capacitance value of the other of the two signal transmission paths. The driving circuit of claim 8, wherein the signal processing circuit comprises a differential amplifier circuit for receiving the sensing signal and the reference signal, and performing a difference according to the sensing signal and the reference signal. Value calculation to obtain the fingerprint identification signal. The driving circuit of claim 8, wherein the driving circuit further comprises: A voltage supply circuit is coupled to the two signal transmission paths through two resistors to provide an identical bias voltage to the two signal transmission paths to drive the sensing panel. A fingerprint identification method is applicable to a sensing panel, wherein the sensing panel includes a plurality of sensors and two signal transmission paths, and the fingerprint identification method includes: transmitting a sensing signal by using one of the two signal transmission paths And transmitting a reference signal through the other of the two signal transmission paths; and performing a fingerprint identification operation according to the sensing signal and the reference signal to generate a fingerprint identification signal, wherein the sensing signal and the reference signal are formed a pair of differential signals, wherein the sensors are respectively connected to the two signal transmission paths via two switching elements, wherein the two switching elements are used to perform a same switching operation, wherein the sensors respectively correspond to the sensing panel a plurality of sensing regions, each of the sensors determining whether to transmit a capacitance value of the corresponding sensing region by one of the two switching elements, wherein the other of the two signal transmission paths transmits the reference The signal does not include the capacitance value of the corresponding sensing area. The fingerprint identification method of claim 14, wherein each of the sensors is configured to sense the capacitance value of the corresponding sensing region, and the sensing signal is based on the capacitance value and the two signal transmission paths. One of the parasitic capacitance values is determined. The fingerprint identification method of claim 15, wherein the reference signal is determined according to a parasitic capacitance value of the other of the two signal transmission paths. The fingerprint identification method of claim 14, wherein the step of performing the fingerprint identification operation according to the sensing signal and the reference signal comprises: performing a difference operation according to the sensing signal and the reference signal to obtain The fingerprint identification signal.