WO2022062225A1 - 指纹识别方法、指纹识别装置和指纹识别显示装置 - Google Patents
指纹识别方法、指纹识别装置和指纹识别显示装置 Download PDFInfo
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- WO2022062225A1 WO2022062225A1 PCT/CN2020/139397 CN2020139397W WO2022062225A1 WO 2022062225 A1 WO2022062225 A1 WO 2022062225A1 CN 2020139397 W CN2020139397 W CN 2020139397W WO 2022062225 A1 WO2022062225 A1 WO 2022062225A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
Definitions
- the present disclosure relates to a fingerprint identification method, a fingerprint identification device, and a fingerprint identification display device.
- the steps of the optical fingerprint recognition under the screen are as follows: 1. Obtain an image of the finger; 2. Identify the ridges and the reflected light change information between the troughs in the image of the finger by simulating the front end, and determine the ridges in the image. and whether the troughs match the ridges and troughs in previous scans.
- the optical fingerprint image has a high dynamic range (from very bright to very dark points), which leads to the complex structure, large size and high power consumption of the analog front end that needs to be used. high.
- the main purpose of the present disclosure is to provide a fingerprint identification method, a fingerprint identification device and a fingerprint identification display device, so as to solve the problem that the optical fingerprint image in the related art has a high dynamic range, so that the required analog front end has a complex structure, a large size and a large size. problem of high power consumption.
- the present disclosure provides a fingerprint identification method, which is applied to a fingerprint identification display device, and the fingerprint identification display device includes a display panel and a photoelectric sensing module disposed on a first surface of the display panel; The first surface is the surface opposite to the surface of the display panel used for fingerprint identification; the fingerprint identification method includes:
- the photoelectric sensor module When the surface of the fingerprint identification display device used for fingerprint identification is touched, and the touched area of the fingerprint identification display device is in a non-lighted state, the photoelectric sensor module receives it in the touched area The received optical signal is photoelectrically converted to obtain the background photocurrent signal;
- the photoelectric sensing module performs photoelectric conversion on the optical signal received in the touched area to obtain a fingerprint photocurrent signal
- a modified fingerprint signal is obtained, and fingerprint identification is performed according to the modified fingerprint signal.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- a modified fingerprint signal is obtained.
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the background photocurrent signal is an analog background photocurrent signal
- the analog-to-digital conversion is performed on the analog-corrected photo-voltage signal to obtain the digital-corrected fingerprint photo-voltage signal.
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the background photocurrent signal is an analog background photocurrent signal
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the analog-to-digital conversion is performed on the analog-corrected fingerprint photo-voltage signal to obtain the digital-corrected fingerprint photo-voltage signal.
- the present disclosure also provides a fingerprint identification device, which is applied to a fingerprint identification display device, and the fingerprint identification display device includes a display panel and a photoelectric sensor module disposed on a first surface of the display panel; the first surface is the surface opposite to the surface used for fingerprint identification of the display panel; the fingerprint identification device includes:
- a touch sensor for detecting a touch event on the surface used for fingerprint recognition of the fingerprint recognition display device, and when detecting that the surface used for fingerprint recognition is touched, providing coordinates of the touched area to the controller;
- the controller is used to control the touched area of the fingerprint identification display device to be in an unlit state after receiving the coordinates, and to control the photoelectric sensing module to perform photoelectricity on the optical signal received in the touched area by the photoelectric sensor module. Convert to obtain a background photocurrent signal, and after obtaining the background photocurrent signal, control to light up the touched area, and then control the photoelectric sensing module to perform photoelectric conversion on the optical signal received in the touched area , the fingerprint photocurrent signal is obtained; and,
- the fingerprint identification circuit is configured to obtain a modified fingerprint signal according to the fingerprint photocurrent signal and the background photocurrent signal, and perform fingerprint identification according to the modified fingerprint signal.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the fingerprint identification circuit includes a conversion Subcircuits, analog-to-digital conversion subcircuits, digital-to-analog conversion subcircuits and fingerprint identification subcircuits;
- the conversion subcircuit is used for converting the analog background photocurrent signal to obtain an analog background photovoltage signal, and converting the analog fingerprint photocurrent signal to obtain an analog fingerprint photovoltage signal;
- the analog-to-digital conversion subcircuit is used to perform analog-to-digital conversion on the analog background photovoltage signal to obtain a digital background photovoltage signal, and perform analog-to-digital conversion on the analog fingerprint photovoltage signal to obtain a digital fingerprint photovoltage signal;
- the digital-to-analog conversion subcircuit is used to perform digital-to-analog conversion on the digital background light voltage signal to obtain a reverse analog background light voltage signal;
- the analog-to-digital conversion sub-circuit is further configured to subtract the reverse analog background photo-voltage signal from the analog fingerprint photo-voltage signal to obtain an analog-corrected photo-voltage signal, and perform analog-digital analysis on the analog-corrected photo-voltage signal. converting, to obtain the digital correction fingerprint photovoltage signal;
- the fingerprint identification sub-circuit is used for correcting the fingerprint photovoltage signal according to the number to perform fingerprint identification.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the fingerprint identification circuit includes a conversion Sub-circuit, analog-to-digital conversion sub-circuit, judgment sub-circuit, digital-to-analog conversion sub-circuit and fingerprint identification sub-circuit;
- the conversion subcircuit is used for converting the analog background photocurrent signal to obtain an analog background photovoltage signal, and converting the analog fingerprint photocurrent signal to obtain an analog fingerprint photovoltage signal;
- the analog-to-digital conversion subcircuit is used to perform analog-to-digital conversion on the analog background light voltage signal to obtain a digital background light voltage signal;
- the digital-to-analog conversion subcircuit is used to perform digital-to-analog conversion on the digital background light voltage signal to obtain a reverse analog background light voltage signal;
- the judging sub-circuit is configured to set the digital fingerprint photovoltage signal as the digital modified fingerprint photovoltage signal when it is judged that the voltage value of the reverse analog background photovoltage signal is less than the threshold voltage value, and set the digital fingerprint photovoltage signal to be the digital fingerprint photovoltage signal.
- the digital correction fingerprint photovoltage signal is provided to the fingerprint identification sub-circuit, and the judgment sub-circuit is further configured to: when it is determined that the voltage value of the reverse analog background photovoltage signal is greater than or equal to the threshold voltage value, the The analog fingerprint photovoltage signal is subtracted from the reverse analog background photovoltage signal to obtain an analog modified photovoltage signal, and the analog modified photovoltage signal is provided to the analog-to-digital conversion sub-circuit;
- the analog-to-digital conversion subcircuit is further configured to perform analog-to-digital conversion on the analog corrected photovoltage signal to obtain the digital corrected fingerprint photovoltage signal;
- the fingerprint identification sub-circuit is used for correcting the fingerprint photovoltage signal according to the number to perform fingerprint identification.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the fingerprint identification circuit includes a conversion Subcircuits, analog-to-digital conversion subcircuits and fingerprint identification subcircuits
- the conversion subcircuit is used for converting the analog background photocurrent signal to obtain an analog background photovoltage signal, and converting the analog fingerprint photocurrent signal to obtain an analog fingerprint photovoltage signal;
- the analog-to-digital conversion sub-circuit is used for subtracting the analog background photo-voltage signal from the analog fingerprint photo-voltage signal to obtain an analog-corrected fingerprint photo-voltage signal, and performing analog-to-digital conversion on the analog-corrected fingerprint photo-voltage signal, obtaining the digitally corrected fingerprint photovoltage signal;
- the fingerprint identification sub-circuit is used for correcting the fingerprint photovoltage signal according to the number to perform fingerprint identification.
- the present disclosure also provides a fingerprint identification display device, comprising a display panel and a photoelectric sensing module disposed on a first surface of the display panel; the fingerprint identification display device further includes the above fingerprint identification device;
- the first surface is a surface opposite to the surface of the display panel for fingerprint recognition.
- the photoelectric sensing module includes photoelectric conversion units arranged in a multi-row multi-column array
- the photoelectric conversion unit is set corresponding to the fingerprint recognition area of the display panel
- the photoelectric conversion unit is used for photoelectric conversion of the received optical signal.
- the fingerprint recognition display device further includes an optical fiber panel disposed between the display panel and the photoelectric sensing module;
- the optical fiber panel is used for collecting the light received by the optical fiber panel to the photoelectric sensing module.
- the fingerprint identification method, the fingerprint identification device and the fingerprint identification display device described in the embodiments of the present disclosure can identify the peaks and valleys of the fingerprint lines in the corrected fingerprint image with a relatively low dynamic range, and the analog front end to be used has a simple structure and a large size. large and low power consumption.
- FIG. 1 is a flowchart of a fingerprint identification method according to an embodiment of the present disclosure
- FIG. 2 is a schematic diagram of the connection relationship between an embodiment of a photoelectric conversion unit in a photoelectric sensor module, an operational amplifier and an analog-to-digital converter;
- FIG. 3 is a structural diagram of a fingerprint identification device according to an embodiment of the present disclosure.
- FIG. 4 is a schematic diagram of the connection relationship between a photoelectric sensing panel, a gate driver and a read control integrated circuit
- FIG. 5 is a structural diagram of a fingerprint identification device according to another embodiment of the present disclosure.
- FIG. 6 is a structural diagram of a fingerprint identification device according to another embodiment of the present disclosure.
- FIG. 7 is a structural diagram of a fingerprint identification device according to still another embodiment of the present disclosure.
- FIG. 8 is a schematic diagram showing the positional relationship among a display panel, an optical fiber panel, and a photoelectric sensing panel included in the fingerprint identification display device according to an embodiment of the present disclosure.
- the transistors used in all the embodiments of the present disclosure may be triodes, thin film transistors, field effect transistors, or other devices with the same characteristics.
- one pole is called the first pole, and the other pole is called the second pole.
- control electrode when the transistor is a triode, the control electrode may be the base electrode, the first electrode may be the collector electrode, and the second electrode may be the emitter electrode; or the control electrode may be the base electrode electrode, the first electrode can be an emitter electrode, and the second electrode can be a collector electrode.
- the control electrode when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode;
- the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
- the fingerprint identification method is applied to a fingerprint identification display device, the fingerprint identification display device includes a display panel and a photoelectric sensor module disposed on a first surface of the display panel; the first surface is the surface opposite to the surface used for fingerprint identification of the display panel; as shown in FIG. 1 , the fingerprint identification method includes:
- S3 Obtain a modified fingerprint signal according to the fingerprint photocurrent signal and the background photocurrent signal, and perform fingerprint identification according to the modified fingerprint signal.
- the photoelectric sensor module when the surface of the fingerprint identification display device used for fingerprint identification is touched, the photoelectric sensor module is first passed through the photoelectric sensor module under the condition that the touched area is not illuminated. Obtain the background photocurrent signal, then light up the touched area, obtain the fingerprint photocurrent signal through the photoelectric sensing module, and then subtract the background photocurrent signal from the fingerprint photocurrent signal to obtain the corrected fingerprint signal.
- the signal is used for fingerprint identification, and a corrected fingerprint image is obtained. There is no background light in the corrected fingerprint image obtained by the fingerprint identification method described in the embodiments of the present disclosure, and a low dynamic range is required to identify the peaks and valleys of fingerprint lines in the corrected fingerprint image.
- the display panel may be an OLED display panel, but not limited thereto.
- the display panel is an OLED display panel
- That the touched area of the fingerprint recognition display device is in an unlit state means: in the touched area, the OLED is not lit;
- Lighting up the touched area refers to: in the touched area, the OLED is lit.
- the photoelectric sensing module may include a plurality of photoelectric conversion units arranged in an array. As shown in FIG. 2 , each of the photoelectric conversion units may include a photoelectric conversion element PD, a storage capacitor Cpd and a the first resistance Rsh;
- the photoelectric conversion element PD performs photoelectric conversion on the received optical signal to obtain a photocurrent signal, and charges the Cpd through the photocurrent signal;
- the photocurrent signal output by the PD is converted through the operational amplifier O1 to obtain an analog photovoltage signal, and the analog photovoltage signal is output through the voltage signal output terminal Vo Signal.
- the reference numeral Ipd is the photocurrent signal output by the photoelectric conversion element PD.
- the first capacitor is labeled Cf
- the second resistor is labeled Rf.
- Vref the reference voltage
- an analog-to-digital converter ADC is also provided at the back end of the operational amplifier O1, for converting the analog optical voltage signal into a digital optical voltage signal.
- the analog front end may include an operational amplifier O1 and an analog-to-digital converter ADC, but is not limited thereto.
- the digital-to-analog converter used in the embodiment of the present disclosure since there is no background light in the corrected fingerprint image, a lower dynamic range is required to identify the peaks and valleys of the fingerprint ridges in the corrected fingerprint image. Therefore, the digital-to-analog converter used in the embodiment of the present disclosure has a relatively low dynamic range. A low effective number of bits is sufficient, the footprint is small, and the power consumption is lower.
- Embodiments of the present disclosure can reuse a smaller number of digital-to-analog converters to eliminate boundary lines in fingerprint images.
- the front-end circuit can have a higher gain before reaching saturation, thereby reducing the influence of circuit noise on the signal-to-noise ratio of the fingerprint identification module.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- a modified fingerprint signal is obtained.
- the analog background photocurrent signal can be converted into an analog background photovoltage signal
- the analog background photovoltage signal can be converted into a digital background photovoltage signal
- the analog fingerprint photovoltage signal can be converted into a digital fingerprint photovoltage signal , and then obtain a modified fingerprint signal according to the digital background photovoltage signal and the digital fingerprint photovoltage signal.
- the modified fingerprint signal may be a digital modified fingerprint photovoltage signal
- the background photocurrent signal may be an analog background photocurrent signal
- the analog-to-digital conversion is performed on the analog-corrected photo-voltage signal to obtain the digital-corrected fingerprint photo-voltage signal.
- digital-to-analog conversion can be performed on the digital background photovoltage signal to obtain a reverse analog background photovoltage signal, and then the analog fingerprint photovoltage signal is subtracted from the reverse analog background photovoltage signal to obtain an analog signal. Correcting the photovoltage signal, and performing analog-to-digital conversion on the analog corrected photovoltage signal to obtain the digitally modified fingerprint photovoltage signal.
- the analog background light voltage signal can be directly provided to the analog-to-digital converter at the back end for analog-to-digital conversion, so as to obtain the digital background light voltage signal, so as to reduce the front end.
- the working time of the photoelectric conversion unit shown in Fig. 2 speeds up the speed of fingerprint recognition; by performing digital-to-analog conversion on the digital background light voltage signal in the back-end circuit, the reverse analog background light voltage signal is obtained, and then the analog background light voltage signal is obtained.
- the fingerprint photovoltage signal is subtracted from the reverse analog background photovoltage signal to obtain an analog corrected photovoltage signal, and then digital-to-analog conversion is performed to obtain a digital corrected photovoltage signal, and fingerprint identification is performed according to the digital corrected photovoltage signal.
- the speed of fingerprint recognition is guaranteed while the accuracy of fingerprint recognition.
- the modified fingerprint signal may be a digital modified fingerprint photovoltage signal
- the background photocurrent signal may be an analog background photocurrent signal
- the threshold voltage value may be selected according to actual conditions.
- the voltage value of the reverse analog background light voltage signal may be compared with a threshold voltage value, and when the voltage value of the reverse analog background light voltage signal is less than the threshold voltage value, the The digital fingerprint photovoltage signal is set as the digital correction fingerprint photovoltage signal, so that the fingerprint photovoltage correction is not performed when the intensity of the background light is small, so as to avoid subtracting the low-light area of the fingerprint image and substantially prevent adding noise to the system and when the voltage value of the reverse analog background photovoltage signal is greater than or equal to the threshold voltage value, subtract the reverse analog background photovoltage signal from the analog fingerprint photovoltage signal to obtain an analog corrected photovoltage signal , perform analog-to-digital conversion on the analog correction photovoltage signal to obtain the digital correction fingerprint photovoltage signal, so that the digital correction fingerprint photovoltage has nothing to do with the background light, and a lower dynamic range is required to identify the correction fingerprint The peaks and valleys of fingerprint ridges in the image.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal
- the analog-to-digital conversion is performed on the analog-corrected fingerprint photo-voltage signal to obtain the digital-corrected fingerprint photo-voltage signal.
- the analog background photocurrent signal and the analog fingerprint photocurrent signal are first converted to obtain the analog background photovoltage signal and the analog fingerprint photovoltage signal; then the analog fingerprint photovoltage signal is directly subtracted simulating the background photovoltage signal to obtain an analog corrected fingerprint photovoltage signal, and then performing analog-to-digital conversion on the analog corrected fingerprint photovoltage signal to obtain the digitally corrected fingerprint photovoltage signal, so that the digitally corrected fingerprint photovoltage Regardless of the background light, a lower dynamic range is required to identify the peaks and valleys of fingerprint lines in the corrected fingerprint image.
- the fingerprint identification device is applied to a fingerprint identification display device, and the fingerprint identification display device includes a display panel and a photoelectric sensor module disposed on a first surface of the display panel; the first surface is the surface opposite to the surface used for fingerprint identification of the display panel; as shown in FIG. 3 , the fingerprint identification device includes:
- a touch sensor 31, electrically connected to the controller 32, is used for detecting a touch event on the surface for fingerprint recognition of the fingerprint recognition display device, and when detecting that the surface for fingerprint recognition is touched, to the control
- the controller 32 provides the coordinates of the touched area
- the controller 32 is electrically connected to the photoelectric sensor module 30, and is used to control the touched area of the fingerprint identification display device to be in an off state after receiving the coordinates, and to control the photoelectric sensor module 30 to It performs photoelectric conversion on the light signal received in the touched area to obtain a background photocurrent signal, and controls to light up the touched area after obtaining the background photocurrent signal, and then controls the photoelectric sensing module 30 to It performs photoelectric conversion on the optical signal received in the touched area to obtain a fingerprint photocurrent signal; and,
- the fingerprint identification circuit 33 is electrically connected to the photoelectric sensing module 30, and is used for obtaining a modified fingerprint signal according to the fingerprint photocurrent signal and the background photocurrent signal, and performing fingerprint identification according to the modified fingerprint signal.
- the touch sensor 31 detects that the surface of the fingerprint identification display device used for fingerprint identification is touched
- the touch sensor 31 provides the coordinates of the touched area to the controller 32
- the controller 32 After receiving the coordinates, control the touched area of the fingerprint identification display device to be in an unlit state, and control the photoelectric sensing module 30 to perform photoelectric conversion on the optical signal received in the touched area to obtain
- the background photocurrent signal is obtained
- the touched area is controlled to light up
- the photoelectric sensing module 30 is controlled to perform photoelectric conversion on the optical signal received in the touched area to obtain Fingerprint photocurrent signal
- the fingerprint identification circuit 33 obtains a modified fingerprint signal according to the fingerprint photocurrent signal and the background photocurrent signal, and performs fingerprint identification according to the modified fingerprint signal.
- the photoelectric sensing module may be disposed on the photoelectric sensing panel Ps, and the photoelectric sensing module may include multiple rows of sensing control lines and multiple columns of reading lines and multi-row multi-column photoelectric conversion elements (not shown in Figure 4);
- Each row of photoelectric conversion elements can be electrically connected to the same row of sensing control lines, the same column of photoelectric conversion elements can be electrically connected to the same row of read lines, and the controller can be arranged in the read control integrated circuit 40;
- the multi-row sensing control lines are electrically connected to the gate driver 41 , and the read control integrated circuit 40 provides the gate driver 41 with a power supply voltage;
- the controller provided in the read control integrated circuit 40 can control the position of the photoelectric conversion element that performs photoelectric conversion by controlling the gate driver 41 to output the induction control signal to each row of the induction control lines, and by controlling the position of the photoelectric conversion element.
- the reading line reads the photocurrent signal output by the photoelectric conversion element.
- the photoelectric sensing panel Ps may be disposed on the surface of the display panel that is opposite to the surface used for fingerprint recognition.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal; as shown in FIG. 5
- the fingerprint identification circuit 33 may include a conversion sub-circuit 331, an analog-to-digital conversion sub-circuit 332, a digital-to-analog conversion sub-circuit 333 and a fingerprint identification sub-circuit 334;
- the conversion sub-circuit 331 is electrically connected to the photoelectric sensor module 30, and is used for converting the analog background photocurrent signal to obtain an analog background photovoltage signal, and converting the analog fingerprint photocurrent signal to obtain Simulate fingerprint photovoltage signal;
- the analog-to-digital conversion sub-circuit 332 is electrically connected to the conversion sub-circuit 331 for performing analog-to-digital conversion on the analog background light voltage signal to obtain a digital background light voltage signal;
- the digital-to-analog conversion sub-circuit 333 is electrically connected to the analog-to-digital conversion sub-circuit 332 for performing digital-to-analog conversion on the digital background light voltage signal to obtain a reverse analog background light voltage signal;
- the analog-to-digital conversion sub-circuit 332 is electrically connected to the conversion sub-circuit 331 and the digital-to-analog conversion sub-circuit 333 respectively, and is also used for subtracting the reverse analog background photo-voltage signal from the analog fingerprint photo-voltage signal , to obtain an analog corrected photovoltage signal, and perform analog-to-digital conversion on the analog corrected photovoltage signal to obtain the digital corrected fingerprint photovoltage signal;
- the fingerprint identification sub-circuit 334 is electrically connected to the analog-to-digital conversion sub-circuit 332, and is used for revising the fingerprint photovoltage signal according to the digital signal to perform fingerprint identification.
- the analog background photovoltage signal and the analog fingerprint photovoltage signal can be obtained through the conversion subcircuit 331, and then the digital background photovoltage signal and the digital fingerprint photovoltage signal can be obtained through the analog-to-digital conversion subcircuit 332.
- the circuit 333 performs digital-to-analog conversion on the digital background photovoltage signal to obtain a reverse analog background photovoltage signal, and then the analog-to-digital conversion sub-circuit 332 subtracts the reverse analog background photovoltage signal from the analog fingerprint photovoltage signal to obtain a reverse analog background photovoltage signal.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal; as shown in FIG. 6
- the fingerprint identification circuit 33 may include a conversion sub-circuit 331, an analog-to-digital conversion sub-circuit 332, a judgment sub-circuit 330, a digital-to-analog conversion sub-circuit 333 and a fingerprint identification sub-circuit 334;
- the conversion sub-circuit 331 is electrically connected to the photoelectric sensor module 30, and is used for converting the analog background photocurrent signal to obtain an analog background photovoltage signal, and converting the analog fingerprint photocurrent signal to obtain Simulate fingerprint photovoltage signal;
- the analog-to-digital conversion sub-circuit 332 is electrically connected to the conversion sub-circuit 331, and is used to perform analog-to-digital conversion on the analog background light voltage signal to obtain a digital background light voltage signal, and perform analog-to-digital conversion on the analog fingerprint light voltage signal. Analog-to-digital conversion to obtain digital fingerprint photovoltage signal;
- the digital-to-analog conversion sub-circuit 333 is electrically connected to the analog-to-digital conversion sub-circuit 332 for performing digital-to-analog conversion on the digital background light voltage signal to obtain a reverse analog background light voltage signal;
- the judging sub-circuit 330 is respectively electrically connected with the digital-to-analog conversion sub-circuit 333, the fingerprint identification sub-circuit 334 and the analog-to-digital conversion sub-circuit 332, and is used for judging the reverse analog background light voltage signal.
- the digital fingerprint photovoltage signal When the voltage value of the digital fingerprint is less than the threshold voltage value, the digital fingerprint photovoltage signal is set as the digital correction fingerprint photovoltage signal, and the digital correction fingerprint photovoltage signal is provided to the fingerprint identification sub-circuit 334, the The judgment sub-circuit 330 is further configured to subtract the reverse analog background light voltage signal from the analog fingerprint light voltage signal when it is judged that the voltage value of the reverse analog background light voltage signal is greater than or equal to the threshold voltage value, to obtain an analog corrected optical voltage signal, and provide the analog corrected optical voltage signal to the analog-to-digital conversion sub-circuit 332;
- the analog-to-digital conversion sub-circuit 332 is further configured to perform analog-to-digital conversion on the analog corrected photovoltage signal to obtain the digital corrected fingerprint photovoltage signal;
- the fingerprint identification sub-circuit 334 is electrically connected to the analog-to-digital conversion sub-circuit 332, and is used for revising the fingerprint photovoltage signal according to the digital signal to perform fingerprint identification.
- the voltage value of the reverse analog background light voltage signal may be compared with a threshold voltage value, and when the voltage value of the reverse analog background light voltage signal is less than the threshold voltage value, the The digital fingerprint photovoltage signal is set as the digital correction fingerprint photovoltage signal, so that the fingerprint photovoltage correction is not performed when the intensity of the background light is small, so as to avoid subtracting the low-light area of the fingerprint image and substantially prevent adding noise to the system and when the voltage value of the reverse analog background photovoltage signal is greater than or equal to the threshold voltage value, subtract the reverse analog background photovoltage signal from the analog fingerprint photovoltage signal to obtain an analog corrected photovoltage signal , perform analog-to-digital conversion on the analog correction photovoltage signal to obtain the digital correction fingerprint photovoltage signal, so that the digital correction fingerprint photovoltage has nothing to do with the background light, and a lower dynamic range is required to identify the correction fingerprint The peaks and valleys of the fingerprint ridges in the image.
- the fingerprint photocurrent signal is an analog fingerprint photocurrent signal
- the background photocurrent signal is an analog background photocurrent signal
- the modified fingerprint signal is a digital modified fingerprint photovoltage signal; as shown in FIG. 7
- the fingerprint identification circuit 33 includes a conversion sub-circuit 331, an analog-to-digital conversion sub-circuit 332 and a fingerprint identification sub-circuit 334;
- the conversion sub-circuit 331 is electrically connected to the photoelectric sensor module 30, and is used for converting the analog background photocurrent signal to obtain an analog background photovoltage signal, and converting the analog fingerprint photocurrent signal to obtain Simulate fingerprint photovoltage signal;
- the analog-to-digital conversion sub-circuit 332 is electrically connected to the conversion sub-circuit 331, and is used for subtracting the analog background photo-voltage signal from the analog fingerprint photo-voltage signal to obtain an analog corrected fingerprint photo-voltage signal, and for the analog fingerprint photo-voltage signal. performing analog-to-digital conversion on the analog correction fingerprint photovoltage signal to obtain the digital correction fingerprint photovoltage signal;
- the fingerprint identification sub-circuit 334 is electrically connected to the analog-to-digital conversion sub-circuit 332, and is used for revising the fingerprint photovoltage signal according to the digital signal to perform fingerprint identification.
- the simulated background photocurrent signal and the simulated fingerprint photocurrent signal are first converted to obtain the simulated background photovoltage signal and the simulated fingerprint photovoltage signal; then the simulated fingerprint photovoltage signal is directly subtracted simulating the background photovoltage signal to obtain an analog corrected fingerprint photovoltage signal, and then performing analog-to-digital conversion on the analog corrected fingerprint photovoltage signal to obtain the digitally corrected fingerprint photovoltage signal, so that the digitally corrected fingerprint photovoltage Regardless of the background light, a lower dynamic range is required to identify the peaks and valleys of fingerprint lines in the corrected fingerprint image.
- the fingerprint identification display device includes a display panel and a photoelectric sensor module disposed on the first surface of the display panel; the fingerprint identification display device further includes the above fingerprint identification device;
- the first surface is a surface opposite to the surface of the display panel for fingerprint recognition.
- the photoelectric sensing module includes photoelectric conversion units arranged in a multi-row multi-column array
- the photoelectric conversion unit is set corresponding to the fingerprint recognition area of the display panel
- the photoelectric conversion unit is used for photoelectric conversion of the received optical signal.
- the fingerprint identification display device described in the present disclosure further includes an optical fiber panel disposed between the display panel and the photoelectric sensing module;
- the optical fiber panel is used for collecting the light received by the optical fiber panel to the photoelectric sensing module.
- the photoelectric sensing module may be disposed on the photoelectric sensing panel Ps, and the display panel 50 , the optical fiber panel 51 and the photoelectric sensing panel Ps may be stacked in sequence.
- the optical fiber panel 51 can collect the light emitted by the display panel 50 and the light reflected by the finger to the photoelectric sensing module.
- the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, and a navigator.
- a display function such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, and a navigator.
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Abstract
一种指纹识别方法、指纹识别装置和指纹识别显示装置。所述指纹识别方法包括：在所述指纹识别显示面板的用于指纹识别的表面被触摸时，在所述指纹识别显示面板的被触摸区域处于不点亮状态下，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号（S1）；点亮所述被触摸区域，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号（S2）；根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别（S3）。
Description
相关申请的交叉引用
本申请主张在2020年9月27日在中国提交的中国专利申请No.202011032311.8的优先权，其全部内容通过引用包含于此。
本公开涉及指纹识别方法、指纹识别装置和指纹识别显示装置。
屏下光学指纹识别的步骤如下：1、获得手指的图像；2、通过模拟前端对所述手指的图像中的脊纹和波谷之间的反射光变化信息进行识别，确定该图像中的脊纹和波谷是否与以前扫描图像中的脊纹和波谷相吻合。在获得指纹的图像时存在一些问题，即光学指纹图像具有很高的动态范围(从非常亮到非常暗的点)，这导致了所需使用的模拟前端的结构复杂，尺寸大且功耗很高。
发明内容
本公开的主要目的在于提供一种指纹识别方法、指纹识别装置和指纹识别显示装置，解决相关技术中光学指纹图像具有很高的动态范围，从而所需使用的模拟前端的结构复杂，尺寸大且功耗高的问题。
为了达到上述目的，本公开提供了一种指纹识别方法，应用于指纹识别显示装置，所述指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面；所述指纹识别方法包括：
在所述指纹识别显示装置的用于指纹识别的表面被触摸时，在所述指纹识别显示装置的被触摸区域处于不点亮状态下，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号；
点亮所述被触摸区域，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号；
根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；
根据所述数字背景光电压信号和所述数字指纹光电压信号，得到修正指纹信号。
可选地，所述修正指纹信号为数字修正指纹光电压信号；所述背景光电流信号为模拟背景光电流信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号；
对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
可选地，所述修正指纹信号为数字修正指纹光电压信号；所述背景光电流信号为模拟背景光电流信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对 所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
当判断到所述反向模拟背景光电压信号的电压值小于阈值电压值时，将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号；
当判断到所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号，所述修正指纹信号为数字修正指纹光电压信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号；
对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号。
本公开还提供了一种指纹识别装置，应用于指纹识别显示装置，所述指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面；所述指纹识别装置包括：
触摸传感器，用于检测所述指纹识别显示装置的用于指纹识别的表面上的触摸事件，并在检测到所述用于指纹识别的表面被触摸时，向控制器提供被触摸区域的坐标；
控制器，用于在接收到所述坐标后控制所述指纹识别显示装置的被触摸区域处于不点亮状态，控制所述光电传感模组对其在被触摸区域接收到的光 信号进行光电转换，得到背景光电流信号，并在得到所述背景光电流信号之后控制点亮所述被触摸区域，之后控制所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号；以及，
指纹识别电路，用于根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；所述指纹识别电路包括转换子电路、模数转换子电路、数模转换子电路和指纹识别子电路；
所述转换子电路用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
所述模数转换子电路用于对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；
所述数模转换子电路用于对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
所述模数转换子电路还用于将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，并对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号；
所述指纹识别子电路用于根据所述数字修正指纹光电压信号，进行指纹识别。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；所述指纹识别电路包括转换子电路、模数转换子电路、判断子电路、数模转换子电路和指纹识别子电路；
所述转换子电路用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
所述模数转换子电路用于对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；
所述数模转换子电路用于对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
所述判断子电路用于当判断到所述反向模拟背景光电压信号的电压值小于阈值电压值时，将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号，并将所述数字修正指纹光电压信号提供至所述指纹识别子电路，所述判断子电路还用于当判断到所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，并将所述模拟修正光电压信号提供至所述模数转换子电路；
所述模数转换子电路还用于对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号；
所述指纹识别子电路用于根据所述数字修正指纹光电压信号，进行指纹识别。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号，所述修正指纹信号为数字修正指纹光电压信号；所述指纹识别电路包括转换子电路、模数转换子电路和指纹识别子电路；
所述转换子电路用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
所述模数转换子电路用于将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号，并对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号；
所述指纹识别子电路用于根据所述数字修正指纹光电压信号，进行指纹识别。
本公开还提供了一种指纹识别显示装置，包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述指纹识别显示装置还包括上述的指纹识别装置；
所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面。
可选地，所述光电传感模组包括多行多列阵列排布的光电转换单元；
所述光电转换单元对应于所述显示面板的指纹识别区域设置；
所述光电转换单元用于对接收到的光信号进行光电转换。
可选地，本公开实施例所述的指纹识别显示装置还包括设置于所述显示面板与所述光电传感模组之间的光纤面板；
所述光纤面板用于将其接收到的光线聚集至所述光电传感模组。
本公开实施例所述的指纹识别方法、指纹识别装置和指纹识别显示装置需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷，需要使用的模拟前端的结构简单，尺寸大且功耗低。
图1是本公开实施例所述的指纹识别方法的流程图；
图2是光电传感模组中的光电转换单元的一实施例、运算放大器与模数转换器之间的连接关系示意图；
图3是本公开实施例所述的指纹识别装置的结构图；
图4是光电传感面板、栅极驱动器以及读取控制集成电路的连接关系示意图；
图5是本公开另一实施例所述的指纹识别装置的结构图；
图6是本公开又一实施例所述的指纹识别装置的结构图；
图7是本公开再一实施例所述的指纹识别装置的结构图；
图8是本公开实施例所述的指纹识别显示装置包括的显示面板、光纤面板以及光电传感面板之间的位置关系示意图。
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开所有实施例中采用的晶体管均可以为三极管、薄膜晶体管或场效应管或其他特性相同的器件。在本公开实施例中，为区分晶体管除控制极之外的两极，将其中一极称为第一极，另一极称为第二极。
在实际操作时，当所述晶体管为三极管时，所述控制极可以为基极，所述第一极可以为集电极，所述第二极可以发射极；或者，所述控制极可以为基极，所述第一极可以为发射极，所述第二极可以集电极。
在实际操作时，当所述晶体管为薄膜晶体管或场效应管时，所述控制极可以为栅极，所述第一极可以为漏极，所述第二极可以为源极；或者，所述控制极可以为栅极，所述第一极可以为源极，所述第二极可以为漏极。
本公开实施例所述的指纹识别方法，应用于指纹识别显示装置，所述指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面；如图1所示，所述指纹识别方法包括：
S1：在所述指纹识别显示装置的用于指纹识别的表面被触摸时，在所述指纹识别显示装置的被触摸区域处于不点亮状态下，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号；
S2：点亮所述被触摸区域，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号；
S3：根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
在本公开实施例所述的指纹识别方法中，当所述指纹识别显示装置的用于指纹识别的表面被触摸时，先在被触摸区域不被点亮的情况下，通过光电传感模组获取背景光电流信号，之后点亮被触摸区域，通过光电传感模组获取指纹光电流信号，然后将所述指纹光电流信号减去所述背景光电流信号，得到修正指纹信号，根据修正指纹信号进行指纹识别，得到修正指纹图像。通过本公开实施例所述的指纹识别方法得到的修正指纹图像中没有背景光，需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷。
在本公开实施例中，所述显示面板可以为OLED显示面板，但不以此为限。
当所述显示面板为OLED显示面板时，
所述指纹识别显示装置的被触摸区域处于不点亮状态指的是：在所述被触摸区域，OLED不被点亮；
点亮所述被触摸区域指的是：在所述被触摸区域，OLED被点亮。
在本公开实施例中，所述光电传感模组可以包括多个阵列排布的光电转换单元，如图2所示，每一所述光电转换单元可以包括光电转换元件PD、存储电容Cpd和第一电阻Rsh；
所述光电转换元件PD将其接收到的光信号进行光电转换，得到光电流信号，并通过所述光电流信号对Cpd进行充电；
如图2所示，在PD对光信号进行光电转换后，再经过运算放大器O1对PD输出的光电流信号进行转换，得到模拟光电压信号，并通过电压信号输出端Vo输出所述模拟光电压信号。
在图2中，标号为Ipd的为光电转换元件PD输出的光电流信号。
在图2中，标号为Cf的为第一电容，标号为Rf的为第二电阻。
在图2中，标号为Vref的为参考电压。
如图2所示，在运算放大器O1后端还设置有模数转换器ADC，用于将所述模拟光电压信号转换为数字光电压信号。
在本公开实施例中，模拟前端可以包括运算放大器O1和模数转换器ADC，但不以此为限。
在本公开实施例中，由于修正指纹图像中没有背景光，需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷，因此本公开实施例采用的数模转换器具有较低的有效位数即可，占用面积小，功耗更低。
本公开实施例可以复用较少数量的数模转换器，消除指纹图像的中的边界线。
本公开实施例通过减小指纹图像的动态范围，以使得前端电路可以在达到饱和前具有更高的增益，可以减少电路噪声对指纹识别模组的信噪比的影响。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；
根据所述数字背景光电压信号和所述数字指纹光电压信号，得到修正指纹信号。
在具体实施时，可以将模拟背景光电流信号转换为模拟背景光电压信号，再将所述模拟背景光电压信号转换为数字背景光电压信号，将模拟指纹光电压信号转换为数字指纹光电压信号，之后根据所述数字背景光电压信号和所述数字指纹光电压信号，得到修正指纹信号。
在本公开实施例中，所述修正指纹信号可以为数字修正指纹光电压信号；所述背景光电流信号可以为模拟背景光电流信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号；
对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
在实际操作时，可以对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号，之后将模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
在本公开实施例中，可以在得到模拟背景光电压信号后，直接将所述模拟背景光电压信号提供至后端的模数转换器进行模数转换，得到数字背景光电压信号，以减小前端图2所示的光电转换单元的工作时间，加快指纹识别的速度；通过在后端电路中，将数字背景光电压信号进行数模转换，得到反 向模拟背景光电压信号，然后将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，之后进行数模转换，得到数字修正光电压信号，根据该数字修正光电压信号进行指纹识别，在提升指纹识别速度的同时保证指纹识别的精度。
在本公开实施例中，所述修正指纹信号可以为数字修正指纹光电压信号；所述背景光电流信号可以为模拟背景光电流信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
当判断到所述反向模拟背景光电压信号的电压值小于阈值电压值时，将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号；
当判断到所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
在具体实施时，所述阈值电压值可以根据实际情况选定。
在具体实施时，可以将所述反向模拟背景光电压信号的电压值与阈值电压值进行比较，当所述反向模拟背景光电压信号的电压值小于所述阈值电压值时，直接将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号，以在背景光的强度较小时不进行指纹光电压修正，避免减去指纹图像的低光区域，实质上防止向系统中添加噪声；而当所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号，以使得所述数字修正指纹光电压与背景光无关，需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷。
可选地，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；
所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：
对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号；
对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号；
对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号。
在具体实施时，先对所述模拟背景光电流信号、所述模拟指纹光电流信号进行转换，得到模拟背景光电压信号、模拟指纹光电压信号；之后直接将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号，之后对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号，以使得所述数字修正指纹光电压与背景光无关，需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷。
本公开实施例所述的指纹识别装置，应用于指纹识别显示装置，所述指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面；如图3所示，所述指纹识别装置包括：
触摸传感器31，与控制器32电连接，用于检测所述指纹识别显示装置的用于指纹识别的表面上的触摸事件，并在检测到所述用于指纹识别的表面被触摸时，向控制器32提供被触摸区域的坐标；
控制器32，与光电传感模组30电连接，用于在接收到所述坐标后控制所述指纹识别显示装置的被触摸区域处于不点亮状态，控制所述光电传感模组30对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号，并在得到所述背景光电流信号之后控制点亮所述被触摸区域，之后控制所述光电传感模组30对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号；以及，
指纹识别电路33，与所述光电传感模组30电连接，用于根据所述指纹光 电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
本公开实施例所述的指纹识别装置在工作时，当所述触摸传感器31检测到指纹识别显示装置的用于指纹识别的表面被触摸时，向控制器32提供被触摸区域的坐标，控制器32在接收到所述坐标后控制所述指纹识别显示装置的被触摸区域处于不点亮状态，控制所述光电传感模组30对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号，并在得到所述背景光电流信号之后控制点亮所述被触摸区域，之后控制所述光电传感模组30对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号，指纹识别电路33根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
在本公开实施例中，如图4所示，所述光电传感模组可以设置于光电传感面板Ps上，所述光电传感模组可以包括多行感应控制线、多列读取线和多行多列光电转换元件(图4中未示出)；
每一行光电转换元件可以与同一行感应控制线电连接，同一列光电转换元件可以与同一列读取线电连接，控制器可以设置于读取控制集成电路40中；
如图4所示，所述多行感应控制线与栅极驱动器41电连接，所述读取控制集成电路40为所述栅极驱动器41提供电源电压；
设置于所述读取控制集成电路40中的所述控制器可以通过控制所述栅极驱动器41输出至各行感应控制线的感应控制信号，以控制进行光电转换的光电转换元件的位置，并通过所述读取线读取光电转换元件输出的光电流信号。
在本公开实施例中，所述光电传感面板Ps可以设置于所述显示面板的用于指纹识别的表面相背的表面上。
根据一种具体实施方式，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；如图5所示，所述指纹识别电路33可以包括转换子电路331、模数转换子电路332、数模转换子电路333和指纹识别子电路334；
所述转换子电路331与所述光电传感模组30电连接，用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流 信号进行转换，得到模拟指纹光电压信号；
所述模数转换子电路332与所述转换子电路331电连接，用于对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；
所述数模转换子电路333与所述模数转换子电路332电连接，用于对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
所述模数转换子电路332分别与所述转换子电路331和所述数模转换子电路333电连接，还用于将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，并对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号；
所述指纹识别子电路334与所述模数转换子电路332电连接，用于根据所述数字修正指纹光电压信号，进行指纹识别。
在实际操作时，可以通过转换子电路331得到模拟背景光电压信号和模拟指纹光电压信号，之后通过模数转换子电路332得到数字背景光电压信号和数字指纹光电压信号，通过数模转换子电路333对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号，之后模数转换子电路332将模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号，以便所述指纹识别子电路334根据所述数字修正指纹光电压信号进行指纹识别。
根据另一种具体实施方式，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；如图6所示，所述指纹识别电路33可以包括转换子电路331、模数转换子电路332、判断子电路330、数模转换子电路333和指纹识别子电路334；
所述转换子电路331与所述光电传感模组30电连接，用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；
所述模数转换子电路332与所述转换子电路331电连接，用于对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；
所述数模转换子电路333与所述模数转换子电路332电连接，用于对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；
所述判断子电路330分别与所述数模转换子电路333、所述指纹识别子电路334和所述模数转换子电路332电连接，用于当判断到所述反向模拟背景光电压信号的电压值小于阈值电压值时，将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号，并将所述数字修正指纹光电压信号提供至所述指纹识别子电路334，所述判断子电路330还用于当判断到所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，并将所述模拟修正光电压信号提供至所述模数转换子电路332；
所述模数转换子电路332还用于对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号；
所述指纹识别子电路334与所述模数转换子电路332电连接，用于根据所述数字修正指纹光电压信号，进行指纹识别。
在具体实施时，可以将所述反向模拟背景光电压信号的电压值与阈值电压值进行比较，当所述反向模拟背景光电压信号的电压值小于所述阈值电压值时，直接将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号，以在背景光的强度较小时不进行指纹光电压修正，避免减去指纹图像的低光区域，实质上防止向系统中添加噪声；而当所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号，以使得所述数字修正指纹光电压与背景光无关，需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷。
根据又一种具体实施方式，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号，所述修正指纹信号为数字修正指纹光电压信号；如图7所示，所述指纹识别电路33包括转换子电路331、模数转换子电路332和指纹识别子电路334；
所述转换子电路331与所述光电传感模组30电连接，用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流 信号进行转换，得到模拟指纹光电压信号；
所述模数转换子电路332与所述转换子电路331电连接，用于将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号，并对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号；
所述指纹识别子电路334与所述模数转换子电路332电连接，用于根据所述数字修正指纹光电压信号，进行指纹识别。
在具体实施时，先对所述模拟背景光电流信号、所述模拟指纹光电流信号进行转换，得到模拟背景光电压信号、模拟指纹光电压信号；之后直接将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号，之后对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号，以使得所述数字修正指纹光电压与背景光无关，需要较低的动态范围即可识别修正指纹图像中的指纹纹线的峰谷。
本公开实施例所述的指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述指纹识别显示装置还包括上述的指纹识别装置；
所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面。
可选地，所述光电传感模组包括多行多列阵列排布的光电转换单元；
所述光电转换单元对应于所述显示面板的指纹识别区域设置；
所述光电转换单元用于对接收到的光信号进行光电转换。
在具体实施时，本公开所述的指纹识别显示装置还包括设置于所述显示面板与所述光电传感模组之间的光纤面板；
所述光纤面板用于将其接收到的光线聚集至所述光电传感模组。
在具体实施时，如图8所示，所述光电传感模组可以设置于光电传感面板Ps上，显示面板50、光纤面板51和所述光电传感面板Ps可以依次层叠设置，所述光纤面板51可以将其接收到的所述显示面板50发出的光线，以及，手指反射的光线聚集至所述光电传感模组。
本公开实施例所提供的显示装置可以为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述是本公开的可选的实施方式，应当指出，对于本技术领域的普 通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。
Claims (12)
- 一种指纹识别方法，应用于指纹识别显示装置，所述指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面；其中，所述指纹识别方法包括：在所述指纹识别显示装置的用于指纹识别的表面被触摸时，在所述指纹识别显示装置的被触摸区域处于不点亮状态下，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号；点亮所述被触摸区域，所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号；根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
- 如权利要求1所述的指纹识别方法，其中，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；根据所述数字背景光电压信号和所述数字指纹光电压信号，得到修正指纹信号。
- 如权利要求1所述的指纹识别方法，其中，所述修正指纹信号为数字修正指纹光电压信号；所述背景光电流信号为模拟背景光电流信号；所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；对所述 数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号；对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
- 如权利要求1所述的指纹识别方法，其中，所述修正指纹信号为数字修正指纹光电压信号；所述背景光电流信号为模拟背景光电流信号；所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，并对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；当判断到所述反向模拟背景光电压信号的电压值小于阈值电压值时，将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号；当判断到所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号。
- 如权利要求1所述的指纹识别方法，其中，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号，所述修正指纹信号为数字修正指纹光电压信号；所述根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号步骤包括：对所述模拟背景光电流信号进行转换，得到模拟背景光电压信号；对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修 正指纹光电压信号；对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号。
- 一种指纹识别装置，应用于指纹识别显示装置，所述指纹识别显示装置包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面；其中，所述指纹识别装置包括：触摸传感器，用于检测所述指纹识别显示装置的用于指纹识别的表面上的触摸事件，并在检测到所述用于指纹识别的表面被触摸时，向控制器提供被触摸区域的坐标；控制器，用于在接收到所述坐标后控制所述指纹识别显示装置的被触摸区域处于不点亮状态，控制所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到背景光电流信号，并在得到所述背景光电流信号之后控制点亮所述被触摸区域，之后控制所述光电传感模组对其在被触摸区域接收到的光信号进行光电转换，得到指纹光电流信号；以及，指纹识别电路，用于根据所述指纹光电流信号和所述背景光电流信号，得到修正指纹信号，根据所述修正指纹信号进行指纹识别。
- 如权利要求6所述的指纹识别装置，其中，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；所述指纹识别电路包括转换子电路、模数转换子电路、数模转换子电路和指纹识别子电路；所述转换子电路用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；所述模数转换子电路用于对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号，并对所述模拟指纹光电压信号进行模数转换，得到数字指纹光电压信号；所述数模转换子电路用于对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；所述模数转换子电路还用于将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，并对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号；所述指纹识别子电路用于根据所述数字修正指纹光电压信号，进行指纹识别。
- 如权利要求6所述的指纹识别装置，其中，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号；所述修正指纹信号为数字修正指纹光电压信号；所述指纹识别电路包括转换子电路、模数转换子电路、判断子电路、数模转换子电路和指纹识别子电路；所述转换子电路用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；所述模数转换子电路用于对所述模拟背景光电压信号进行模数转换，得到数字背景光电压信号；所述数模转换子电路用于对所述数字背景光电压信号进行数模转换，得到反向模拟背景光电压信号；所述判断子电路用于当判断到所述反向模拟背景光电压信号的电压值小于阈值电压值时，将所述数字指纹光电压信号设置为所述数字修正指纹光电压信号，并将所述数字修正指纹光电压信号提供至所述指纹识别子电路，所述判断子电路还用于当判断到所述反向模拟背景光电压信号的电压值大于或等于阈值电压值时，将所述模拟指纹光电压信号减去所述反向模拟背景光电压信号，以得到模拟修正光电压信号，并将所述模拟修正光电压信号提供至所述模数转换子电路；所述模数转换子电路还用于对所述模拟修正光电压信号进行模数转换，以得到所述数字修正指纹光电压信号；所述指纹识别子电路用于根据所述数字修正指纹光电压信号，进行指纹识别。
- 如权利要求6所述的指纹识别装置，其中，所述指纹光电流信号为模拟指纹光电流信号，所述背景光电流信号为模拟背景光电流信号，所述修正 指纹信号为数字修正指纹光电压信号；所述指纹识别电路包括转换子电路、模数转换子电路和指纹识别子电路；所述转换子电路用于将所述模拟背景光电流信号进行转换，得到模拟背景光电压信号，对所述模拟指纹光电流信号进行转换，得到模拟指纹光电压信号；所述模数转换子电路用于将所述模拟指纹光电压信号减去所述模拟背景光电压信号，得到模拟修正指纹光电压信号，并对所述模拟修正指纹光电压信号进行模数转换，得到所述数字修正指纹光电压信号；所述指纹识别子电路用于根据所述数字修正指纹光电压信号，进行指纹识别。
- 一种指纹识别显示装置，包括显示面板和设置于所述显示面板的第一表面的光电传感模组；所述指纹识别显示装置还包括如权利要求6至9中任一权利要求所述的指纹识别装置；所述第一表面为与所述显示面板的用于指纹识别的表面相背的表面。
- 如权利要求10所述的指纹识别显示装置，其中，所述光电传感模组包括多行多列阵列排布的光电转换单元；所述光电转换单元对应于所述显示面板的指纹识别区域设置；所述光电转换单元用于对接收到的光信号进行光电转换。
- 如权利要求10所述的指纹识别显示装置，还包括设置于所述显示面板与所述光电传感模组之间的光纤面板；所述光纤面板用于将其接收到的光线聚集至所述光电传感模组。
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