electronic devices

Abstract

The present disclosure relates to an electronic device comprising a display screen and an optical fingerprint detection module disposed below the display screen; the optical fingerprint detection module comprises a plurality of row control lines, a plurality of column data lines, pixels disposed at the intersection of any row control line and any column data line, a drive circuit connected to the plurality of row control lines, a data reading circuit connected to the plurality of column data lines, and a charge elimination circuit; the plurality of rows of pixels belong to multiple groups, and at least one group includes two or more rows of pixels; the drive circuit is configured to sequentially turn on each row of pixels during a scanning phase, and the data reading circuit is configured to read pixel data of each pixel; the drive circuit is configured to sequentially turn on each group of pixels during a reset phase, and the charge elimination circuit is configured to provide a forward bias voltage to pixels in the on state to eliminate charge in the pixels. This embodiment can quickly eliminate residual charge in the pixels.

Description

Technical Field

[0001] The present disclosure relates to the field of control technology, and in particular to an electronic device. Background Art

[0002] Currently, more and more electronic devices are using under-screen fingerprint solutions for unlocking, payment, and other scenarios. Figure 1 When the display screen is an OLED display screen, the OLED self-luminescence encounters the finger and is reflected to the optical fingerprint module. The optical fingerprint module detects the image based on the reflected light to obtain the fingerprint.

[0003] Figure 1 The optical fingerprint module shown includes an optical path and a sensor, wherein the sensor circuit is as follows Figure 2 As shown in the figure, the sensor includes an optical fingerprint sensing area and a non-sensing area. The optical fingerprint sensing area includes multiple pixel circuits, each of which includes a switching device TFT and a photodiode PD; the non-sensing area includes a gate driver chip (GOA) and a data readout chip (ROIC).

[0004] Figure 3 The circuit architecture and timing of a pixel reading charge are shown in FIG. Figure 3 , triggering the RST switch to discharge the capacitor CF, that is, to reset the operational amplifier. And read the output value Vout1 of the output terminal Vout of the operational amplifier at time t1. After a period of time, the PD can collect light energy and convert it into capacitance. After turning on the GOA to reach this line of the PD, the signal at SEL is effectively turned on. At time t2, read the output value Vout2 of the output terminal Vout of the operational amplifier. Then, subtract the two values ​​to get the light signal collected by the PD. The PD signal of the entire sensing area can restore the fingerprint. In other words, Figure 3 In the illustrated architecture, the photodiode PD is a key component, and the accumulated photocharge (sensitivity) of the photodiode determines the quality of the entire fingerprint image.

[0005] In practical applications, photodiodes (PDs) use an a-Si PIN structure and are manufactured using chemical vapor deposition (CVD). During this process, some electrons in the PD are trapped, resulting in residual photocharges. This means that the data read will include the previously accumulated charge, affecting detection accuracy. Summary of the Invention

[0006] The present disclosure provides an electronic device to solve the deficiencies of the related art.

[0007] According to a first aspect of an embodiment of the present disclosure, an electronic device is provided, comprising a display screen and an optical fingerprint detection module disposed below the display screen; the optical fingerprint detection module comprises a plurality of row control lines, a plurality of column data lines, pixels disposed at the intersection of any row control line and any column data line, a drive circuit connected to the plurality of row control lines, a data reading circuit connected to the plurality of column data lines, and a charge elimination circuit; the plurality of rows of pixels belong to a plurality of groups, and at least one group includes two or more rows of pixels;

[0008] The driving circuit is used to sequentially turn on each row of pixels during a scanning phase, and the data reading circuit is used to read pixel data of each pixel to obtain fingerprint data based on the pixel data;

[0009] The driving circuit is used to turn on each group of pixels in sequence during a reset phase, and the charge elimination circuit is used to provide a forward bias voltage to the pixels in the turned-on state to eliminate the charge in the pixels.

[0010] Optionally, the number of rows of pixels included in the multiple groups is the same.

[0011] Optionally, the charge elimination circuit includes a bias switch and a bias power supply; the bias power supply can provide a forward bias voltage and a reverse bias voltage; wherein the forward bias voltage is a voltage for placing the photodiode in the pixel in a forward bias state, and the reverse bias voltage is a voltage for placing the photodiode in the pixel in a reverse bias state;

[0012] The bias switch is used to provide a reverse bias voltage to the pixels in the on state during the scan phase, and is used to provide a forward bias voltage to the pixels in the on state during the reset phase.

[0013] Optionally, the charge elimination circuit also includes a first switch and a preset power supply; the first end of the first switch is connected to the data line of the column, the second end of the first switch is connected to the preset power supply, and the control end of the first switch is connected to the driving circuit; the first switch is used to connect the data line of the column and the preset power supply upon receiving a control signal from the driving circuit.

[0014] Optionally, the preset power supply includes at least one of the following: ground, a negative voltage source, and a current source.

[0015] Optionally, the driving circuit includes a first driving unit and a second driving unit;

[0016] The first driving unit is used to output control signals to each row control line in sequence during the scanning phase;

[0017] The second driving unit is used to output control signals to each group of control lines in sequence during the reset phase.

[0018] Optionally, the data reading circuit includes several data reading units, each data reading unit is connected to a data line one-to-one; each data reading unit includes an operational amplifier and a feedback capacitor; the inverting input terminal of the operational amplifier is respectively connected to the data line of the column and the first end of the feedback capacitor, the non-inverting input terminal of the operational amplifier is grounded, and the output terminal of the operational amplifier is connected to the second end of the feedback capacitor.

[0019] Optionally, the data reading circuit further includes an analog-to-digital converter, which is connected to each data reading unit and is used to perform analog-to-digital conversion on the pixel data output by the data reading unit.

[0020] According to a second aspect of an embodiment of the present disclosure, an electronic device is provided, comprising a display screen and an optical fingerprint detection module disposed below the display screen; the optical fingerprint detection module comprises a plurality of row control lines, a plurality of column data lines, pixels disposed at the intersection of any row control line and any column data line, a drive circuit connected to the plurality of row control lines, a data reading circuit connected to the plurality of column data lines, and a charge elimination circuit;

[0021] The driving circuit is used to sequentially turn on each row of pixels during a scanning phase, and the data reading circuit is used to read pixel data of each pixel to obtain fingerprint data based on the pixel data;

[0022] The driving circuit is used to turn on each row of pixels in sequence during a reset phase, and the charge elimination circuit is used to provide a forward bias voltage to the pixels in the turned-on state to eliminate the charge in the pixels.

[0023] Optionally, the charge elimination circuit includes a bias switch and a bias power supply; the bias power supply can provide a forward bias voltage and a reverse bias voltage; wherein the forward bias voltage is used to put the photodiode in the pixel in a forward bias state, and the reverse bias voltage is used to put the photodiode in the pixel in a reverse bias state;

[0024] The bias switch is used to provide a reverse bias voltage to the pixels in the on state during the scan phase, and is used to provide a forward bias voltage to the pixels in the on state during the reset phase.

[0025] Optionally, the charge elimination circuit also includes a first switch and a preset power supply; the first end of the first switch is connected to the data line of the column, the second end of the first switch is connected to the preset power supply, and the control end of the first switch is connected to the driving circuit; the first switch is used to connect the data line of the column and the preset power supply upon receiving a control signal from the driving circuit.

[0026] Optionally, the preset power supply includes at least one of the following: ground, a negative voltage source, and a current source.

[0027] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0028] As can be seen from the above embodiments, the disclosed embodiments can group several rows of pixel data, and during the reset phase, each group of pixels can be sequentially turned on to eliminate the charge in each pixel. Because each group of pixels corresponds to multiple rows, the time taken for each group of pixels to eliminate the charge can be increased, which is beneficial for eliminating residual charge in the pixels. Furthermore, without exceeding the on-time in related art (e.g., the product of the number of rows in each group and the on-time for each row), the time taken during the reset phase can be reduced.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0031] Figure 1 This is a schematic diagram of the spatial position relationship between an optical fingerprint detection module and a display screen shown in the related art.

[0032] Figure 2 This is a schematic diagram of the circuit structure of an optical fingerprint detection module shown in the related art.

[0033] Figure 3 FIG. 1 is a schematic diagram of a charge collection circuit including one pixel shown in the related art.

[0034] Figure 4 The figure is a schematic diagram showing a circuit structure of an electronic device according to an exemplary embodiment.

[0035] Figure 5 FIG. 1 is a schematic diagram showing a logic structure of a driving circuit according to an exemplary embodiment.

[0036] Figure 6 It is a working timing diagram according to an exemplary embodiment.

[0037] Figure 7 is a schematic diagram showing a circuit structure of another electronic device according to an exemplary embodiment.

[0038] Figure 8 This is a schematic diagram showing a current source disposed inside a data acquisition circuit as shown in the related art.

[0039] Figure 9 This is a schematic diagram showing that a current source is provided outside a data acquisition circuit as shown in the related art.

[0040] Figure 10 It is a working timing diagram according to an exemplary embodiment.

[0041] Figure 11 is a schematic diagram showing a circuit structure of another electronic device according to an exemplary embodiment.

[0042] Figure 12 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The exemplary embodiments described below are not intended to represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0044] In order to eliminate the residual charge in the photodiode PD in the pixel, the embodiment of the present disclosure provides an electronic device, which may include a display screen and an optical fingerprint detection module arranged below the display screen. Figure 4 The optical fingerprint detection module includes several rows of control lines (G1~G N ) and several columns of data lines (R O1 ~R ON ), pixels arranged at the intersection of any row control line and any column data line, a driving circuit (GOA) connected to several row control lines, a data reading circuit (ROIC) connected to several column data lines, and a charge elimination circuit; several rows of pixels belong to multiple groups and at least one group includes two or more rows of pixels.

[0045] Continue to see Figure 4In this embodiment, several rows of pixels in the optical fingerprint detection module are divided into multiple groups. The division method may include but is not limited to average division and random division. Taking average division as an example, assuming the preset number is M, the number of pixels in each group is N / M, that is, any two groups in the multiple groups have the same number of rows of pixels. Thus, the working principle of the optical fingerprint detection module in this embodiment is as follows:

[0046] The driving circuit GOA can sequentially turn on each row of pixels during the scanning phase, and the data reading circuit ROIC can read pixel data of each pixel to obtain fingerprint data based on the pixel data; and

[0047] The driving circuit GOA can turn on each group of pixels in sequence during a reset phase, and the charge elimination circuit is used to provide a forward bias voltage to the pixels in the on state, and the data reading circuit is used to eliminate the charge in each pixel.

[0048] Considering that the time taken for resetting each row of pixels in the reset phase in the related art is TA, the maximum available time for each group of pixels in the reset phase in this example is TA*N / M. In practical applications, the time taken for each group of pixels in the reset phase in this embodiment is TB, where TB can be determined based on the actual time taken for the pixel to eliminate the charge, such as 2TA, 3TA, that is, the value range of TB is (TA, TA*N / M). In other words, in this embodiment, by eliminating the charge of each column of pixels in the group, the time taken for eliminating the charge TB can be made greater than the time TA used in the related art, ensuring that the photodiode PD in the pixel has sufficient time to eliminate the charge; and, in this embodiment, TB is less than TA*N / M, which can also reduce the time taken for each group of pixels to eliminate the charge, which is conducive to improving the efficiency of charge elimination.

[0049] To eliminate charge from a single row or group of controlled pixels, the drive circuit GOA in this example may include a first drive unit and a second drive unit. The first drive unit is configured to sequentially output control signals to each row of control lines during a scan phase, while the second drive unit is configured to sequentially output control signals to each group of control lines during a reset phase. Figure 5 FIG. 1 is a schematic diagram showing a circuit structure of a driving circuit GOA according to an exemplary embodiment. Figure 5 As shown, the optical fingerprint detection module can control the multiplexer MUX to switch through the control terminal CON:

[0050] During the scanning phase, the driving circuit GOA can output a first level through the control terminal CON, so that each MUX switches to the first input terminal. At this time, the driving signal of the shift register SR1-(1~N+1) can pass through the first input terminal of MUX1~M and output to the Gate terminal 1~M, so that single-row control of pixels can be achieved.

[0051] During the reset phase, the driver circuit GOA can output a second level through the control terminal CON, switching each MUX to its second input terminal. At this point, the drive signal from the shift register SR2-(1-N / M+1) can pass through the second input terminals of the multiplexers MUX 1-N and be output to Gates 1-N. Gates 1-N are connected to control lines G1-N, enabling single-group control of pixels.

[0052] It should be noted that technicians can select an implementation scheme of the driving circuit GOA according to specific scenarios. If single-row and single-group control can be achieved, the corresponding scheme falls within the protection scope of this disclosure.

[0053] Combine Figures 4 to 6 The working principle of the optical fingerprint detection module is described as follows:

[0054] During the reset phase, the driver circuit GOA controls the multiplexer MUX to switch to the respective second input terminals, so that the control signal output by the shift register SR2 is output to the Gate terminal via the second input terminal of the MUX in the row, thereby making the control line G corresponding to each group high. At this time, the switching devices in the pixels of each group are turned on. At the same time, the reset switch RST is closed, and the switch K1 is closed, and the photodiode PD is forward-conducted. At this time, the residual charge in the photodiode PD begins to disappear. After a certain time T#1 (such as the time TB mentioned above), the residual charge in the photodiode PD can be completely eliminated. In this way, in this stage, by increasing the duration of the reset phase, sufficient time can be provided to eliminate the residual charge in the photodiode PD. At t1, the operational amplifier can detect the voltage at VN and output it, which is recorded as Vout1.

[0055] In the sensing stage, the control line G is at a low level, the reset switch RST is disconnected, and the switch K1 is disconnected. At this time, the photodiode PD can sense external light, forming a leakage current, which makes V N The voltage change at Delta V is .

[0056] In the scanning phase, the driving circuit GOA controls the multiplexer MUX to switch to the first input terminal of each row, so that the control signal output by the shift register SR1 passes through the first input terminal of the MUX in the row and is output to the Gate terminal, that is, the control line G is high. At this time, the switching devices in the pixels of each row are turned on in sequence. The cathode of the photodiode PD is connected to the feedback capacitor C F At t2, the operational amplifier can detect the voltage at VN and output it as Vout2.

[0057] In this way, the analog-to-digital conversion unit in the data reading circuit can obtain the pixel data (Vout1 and Vout2) output by the data reading unit for analog-to-digital conversion. The two can be subtracted to obtain Delta V. The disclosed embodiment can group several rows of pixel data, and during the reset phase, each group of pixels can be turned on sequentially to eliminate the charge in each pixel. Because each group of pixels corresponds to multiple rows, the time taken for each group of pixels to eliminate the charge can be increased, which is beneficial for eliminating the residual charge in the pixels. Moreover, without exceeding the on-time in the related art (such as the product of the number of rows in each group and the on-time of each row), the time used in the reset phase can also be reduced.

[0058] In one embodiment, the optical fingerprint detection module further includes a charge elimination circuit, which is used to provide a forward bias voltage to the pixels in the on state during the reset phase to eliminate the charge in each pixel. Figure 7 The charge elimination circuit includes a power supply and a bias switch Bias. The power supply is connected to each column of data lines through the bias switch Bias. The power supply is used to provide a reverse bias voltage -V and a forward bias voltage +V. The reverse bias voltage is a negative value, and the forward bias voltage is a positive value. In other words, the forward bias voltage is used to put the photodiode in the pixel in a forward biased state, and the reverse bias voltage is used to put the photodiode in the pixel in a reverse biased state. The bias switch Bias is used to turn on the power supply and the data line during the scanning phase to provide the data line with a reverse bias voltage -V, and to turn on the power supply and the data line during the reset phase to provide the data line with a forward bias voltage +V. In this way, in this embodiment, by switching the bias switch Bias to the forward bias voltage +V, the photodiode PD can be put in a forward biased state, thereby quickly eliminating the charge accumulated in the PD.

[0059] In one embodiment, see Figure 7 , in the case of unchanged pixel circuit, GOA adopts the circuit in related technology or adopts Figure 4 In the case of the circuit shown, the data reading circuit includes a plurality of data reading units, each of which is connected to a data line in a one-to-one correspondence; each data reading unit includes a current source, which is used to eliminate the charge in the pixels in the column; or, the electronic device includes a current source corresponding to each data reading unit in a one-to-one correspondence, and the current source is used to eliminate the charge in the pixels in the column. Figure 8 1 is a schematic diagram showing a circuit structure of a data reading circuit according to an exemplary embodiment, wherein a current source is provided in the data reading circuit; Figure 9 1 is a schematic diagram of a circuit structure of a data reading circuit according to an exemplary embodiment, wherein a current source is provided outside the data reading circuit.

[0060] In other words, the charge elimination circuit includes a current source, and the charge elimination circuit can be arranged inside or outside the data reading unit, and can be arranged according to specific scenarios, which is not limited here.

[0061] Take the current source in the charge elimination circuit as an example, which is set inside the data reading unit. Figure 8 The data reading unit includes an operational amplifier A1, a feedback capacitor C F and current source I leak The inverting input of the operational amplifier A1 is connected to the data line of the column, the current source I leak The positive terminal and feedback capacitor C F The first end of the operational amplifier A1 is connected to the ground, the non-inverting input terminal of the operational amplifier A1 is grounded, and the output terminal of the operational amplifier A1 is connected to the feedback capacitor C F The second end of the

[0062] For example, the current source in the charge elimination circuit is set outside the data reading unit. Figure 9 The data reading unit includes an operational amplifier A1, a feedback capacitor C F , and the electronic device further includes a current source I leak The inverting input of the operational amplifier A1 is connected to the data line of the column, the current source I leak The positive terminal and feedback capacitor C F The first end of the operational amplifier A1 is connected to the ground, the non-inverting input terminal of the operational amplifier A1 is grounded, and the output terminal of the operational amplifier A1 is connected to the feedback capacitor C F The second end of the

[0063] Combine Figures 7 to 10 The working principle of the optical fingerprint detection module is described as follows:

[0064] During the reset phase, the driver circuit GOA outputs a control signal, setting the control line G to a high level. This turns on the switching devices in each row of pixels sequentially. Furthermore, the reset switch RST is closed, and switch K1 is also closed, causing the photodiode PD to conduct in the forward direction. This creates a discharge path between the current source, the control line, and the photodiode PD. The high current from the current source eliminates any residual charge in the PD. At t1, the operational amplifier detects the voltage at VN and outputs it, denoted as Vout1.

[0065] In the sensing stage, the control line G is at a low level, the reset switch RST is disconnected, and the switch K1 is disconnected. At this time, the photodiode PD can sense external light, forming a leakage current, which makes V N The voltage change at Delta V is .

[0066] In the scanning phase, the control line G is at a high level, and the switching device in the pixel is turned on; at the same time, the reset switch RST is turned off, and the switch K1 is turned off. At this time, the cathode of the photodiode PD is connected to the feedback capacitor C F At t2, the operational amplifier can detect the voltage at VN and output it as Vout2.

[0067] In this way, the analog-to-digital conversion unit in the data reading circuit can obtain the pixel data (Vout1 and Vout2) output by the data reading unit to perform analog-to-digital conversion, and Delta V can be obtained by subtracting the two.

[0068] Thus, the embodiment of the present disclosure connects a current source to the data line, and can utilize the large current of the current source to accelerate the elimination of residual charge in the pixel, thereby improving the elimination efficiency and enhancing the accuracy of detection.

[0069] In one embodiment, see Figure 11 The electronic device includes a display screen and an optical fingerprint detection module disposed below the display screen. Figure 11 The optical fingerprint detection module includes several rows of control lines (G1~G N ) and several columns of data lines (R O1 ~R ON ), a pixel is set at the intersection of any row control line and any column data line, a driving circuit (GOA) connected to several row control lines and a data reading circuit (ROIC) connected to several column data lines.

[0070] Continue to see Figure 11 The number of charge elimination circuits can be multiple, that is, each charge elimination circuit can correspond to each group one by one, or the number of charge elimination circuits can be one. The charge elimination circuit is used to provide a forward bias voltage to the pixels in the on state during the reset phase to eliminate the charge in the pixels of the group. Figure 11 The shaded area shows a charge cancellation circuit. Figure 11 The charge elimination circuit includes a first switch T1 and a preset power source Vg. A first end of the first switch T1 is connected to the data line Rox of the corresponding column, a second end of the first switch T1 is connected to the preset power source Vg, and a control end of the first switch T1 is connected to the drive circuit GOA. The first switch T1 is configured to connect the data line of the corresponding column to the preset power source upon receiving a control signal from the drive circuit GOA. The preset power source includes at least one of the following: ground, a negative voltage source, and a current source.

[0071] Combine Figure 6 and Figure 11 , describing the working principle of the optical fingerprint detection module as follows:

[0072] During the reset phase, the driver circuit GOA outputs a control signal to set the control line G to a high level, turning on the pixels in each row in order, turning on the switches in that row. At the same time, GOA also outputs a control signal to the first switch T1, connecting the data line Rox to the preset power supply Vg, which is then connected to the pixels in the row. This allows the preset power supply to forward eliminate the residual charge on the photodiodes in each pixel. The working methods of other phases can be found in [Note: The following text appears to be unrelated and should be omitted.] Figure 4 and Figure 7 The electronic equipment shown will not be described in detail here.

[0073] As can be seen, by providing a charge elimination circuit for each pixel group, the disclosed embodiment can accelerate the elimination of residual charge in the pixels, thereby improving elimination efficiency and enhancing detection accuracy. Furthermore, providing a charge elimination circuit for each group in this embodiment can eliminate residual charge for pixels whose pixel data has been read while other groups are reading pixel data, further improving reset efficiency.

[0074] It should be noted that, in the absence of conflicts, technicians can combine the above embodiments to obtain different solutions: combining group drive and current source, combining group drive and charge elimination circuit, combining current source and charge elimination circuit, and combining group drive, current source and charge elimination circuit. The above solutions fall within the protection scope of this disclosure.

[0075] Figure 12 1 is a block diagram of an electronic device according to an exemplary embodiment. For example, the electronic device 1200 may be a smartphone, a computer, a digital broadcast terminal, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0076] Reference Figure 12 , the electronic device 1200 may include one or more of the following components: a processing component 1202 , a memory 1204 , a power component 1206 , a multimedia component 1208 , an audio component 1210 , an input / output (I / O) interface 1212 , a sensor component 1214 , a communication component 1216 , and an image acquisition component 1218 .

[0077] The processing component 1202 generally controls the overall operation of the electronic device 1200, such as operations associated with display, phone calls, data communications, camera operation, and recording operations. The processing component 1202 may include one or more processors 1220 to execute computer programs. In addition, the processing component 1202 may include one or more modules to facilitate interaction between the processing component 1202 and other components. For example, the processing component 1202 may include a multimedia module to facilitate interaction between the multimedia component 1208 and the processing component 1202.

[0078] The memory 1204 is configured to store various types of data to support operations on the electronic device 1200. Examples of such data include computer programs for any application or method operating on the electronic device 1200, contact data, phone book data, messages, pictures, videos, etc. The memory 1204 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0079] The power supply assembly 1206 provides power to various components of the electronic device 1200. The power supply assembly 1206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device 1200. The power supply assembly 1206 may include a power chip, and the controller may communicate with the power chip to control the power chip to turn on or off a switching device, thereby enabling or disabling the battery to supply power to the mainboard circuit.

[0080] The multimedia component 1208 includes a screen that provides an output interface between the electronic device 1200 and the target object. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the target object. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor can not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.

[0081] The audio component 1210 is configured to output and / or input audio signals. For example, the audio component 1210 includes a microphone (MIC), which is configured to receive external audio signals when the electronic device 1200 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 1204 or transmitted via the communication component 1216. In some embodiments, the audio component 1210 also includes a speaker for outputting audio signals.

[0082] The I / O interface 1212 provides an interface between the processing component 1202 and peripheral interface modules, such as a keyboard, a click wheel, buttons, etc.

[0083] Sensor assembly 1214 includes one or more sensors for providing various status assessments for electronic device 1200. For example, sensor assembly 1214 can detect the open / closed state of electronic device 1200, the relative positioning of components, such as the display screen and keypad of electronic device 1200. Sensor assembly 1214 can also detect changes in the position of electronic device 1200 or a component, the presence or absence of contact between a target object and electronic device 1200, the orientation or acceleration / deceleration of electronic device 1200, and changes in the temperature of electronic device 1200. In this example, sensor assembly 1214 may include a magnetic sensor, a gyroscope, and a magnetic field sensor, where the magnetic field sensor includes at least one of the following: a Hall effect sensor, a thin-film magnetoresistive sensor, or a magnetic fluid accelerometer.

[0084] The communication component 1216 is configured to facilitate wired or wireless communication between the electronic device 1200 and other devices. The electronic device 1200 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 1216 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1216 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0085] In an exemplary embodiment, the electronic device 1200 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0086] In an exemplary embodiment, a non-transitory readable storage medium including an executable computer program is also provided, such as memory 1204 including instructions. The executable computer program can be executed by a processor. The readable storage medium can be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

[0087] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0088] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An electronic device, characterized in that: The optical fingerprint detection module comprises a display screen and an optical fingerprint detection module disposed below the display screen; the optical fingerprint detection module comprises a plurality of row control lines, a plurality of column data lines, pixels disposed at the intersection of any row control line and any column data line, a drive circuit connected to the plurality of row control lines, a data reading circuit connected to the plurality of column data lines, and a charge elimination circuit; the plurality of rows of pixels belong to a plurality of groups, and at least one group comprises two or more rows of pixels; The driving circuit is used to sequentially turn on each row of pixels during a scanning phase, and the data reading circuit is used to read pixel data of each pixel to obtain fingerprint data based on the pixel data; The driving circuit is used to turn on each group of pixels in sequence during a reset phase, and the charge elimination circuit is used to provide a forward bias voltage to the pixels in the turned-on state to eliminate the charge in the pixels; The available time of each group of pixels in the reset phase is between TA and TA*N / M, where TA is the time used by a row of pixels in the reset phase, N is the total number of pixel rows, and M is the total number of groups.

2. The electronic device according to claim 1, wherein The number of rows including pixels in the plurality of groups is the same.

3. The electronic device according to claim 1, wherein The charge elimination circuit includes a bias switch and a bias power supply; the bias power supply can provide a forward bias voltage and a reverse bias voltage; wherein the forward bias voltage is used to put the photodiode in the pixel in a forward bias state, and the reverse bias voltage is used to put the photodiode in the pixel in a reverse bias state; The bias switch is used to provide a reverse bias voltage to the pixels in the on state during the scan phase, and is used to provide a forward bias voltage to the pixels in the on state during the reset phase.

4. The electronic device according to claim 1, wherein: The charge elimination circuit also includes a first switch and a preset power supply; the first end of the first switch is connected to the data line of the column, the second end of the first switch is connected to the preset power supply, and the control end of the first switch is connected to the drive circuit; the first switch is used to connect the data line of the column and the preset power supply when receiving a control signal from the drive circuit.

5. The electronic device according to claim 4, characterized in that The preset power source includes at least one of the following: ground, a negative voltage source, and a current source.

6. The electronic device according to claim 1, wherein: The driving circuit includes a first driving unit and a second driving unit; The first driving unit is used to output control signals to each row control line in sequence during the scanning phase; The second driving unit is used to output control signals to each group of control lines in sequence during the reset phase.

7. The electronic device according to claim 1, wherein: The data reading circuit includes several data reading units, each of which is connected to a data line in a one-to-one correspondence; each data reading unit includes an operational amplifier and a feedback capacitor; the inverting input terminal of the operational amplifier is respectively connected to the data line of the column and the first end of the feedback capacitor, the non-inverting input terminal of the operational amplifier is grounded, and the output terminal of the operational amplifier is connected to the second end of the feedback capacitor.

8. The electronic device according to claim 7, wherein: The data reading circuit further includes an analog-to-digital converter, which is connected to each data reading unit and is used to perform analog-to-digital conversion on the pixel data output by the data reading unit.

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