WO2019127576A1 - Procédé de détection de lumière pour dispositif photosensible - Google Patents

Procédé de détection de lumière pour dispositif photosensible Download PDF

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Publication number
WO2019127576A1
WO2019127576A1 PCT/CN2017/120404 CN2017120404W WO2019127576A1 WO 2019127576 A1 WO2019127576 A1 WO 2019127576A1 CN 2017120404 W CN2017120404 W CN 2017120404W WO 2019127576 A1 WO2019127576 A1 WO 2019127576A1
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Prior art keywords
photosensitive
signal
light sensing
pixels
row
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PCT/CN2017/120404
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English (en)
Chinese (zh)
Inventor
李问杰
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Shenzhen Sunwave Technology Co Ltd
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Shenzhen Sunwave Technology Co Ltd
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Priority to PCT/CN2017/120404 priority Critical patent/WO2019127576A1/fr
Priority to CN201780002288.8A priority patent/CN108140121A/zh
Publication of WO2019127576A1 publication Critical patent/WO2019127576A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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

Definitions

  • the present invention relates to a light sensing method for a photosensitive device for sensing biometric information.
  • optical fingerprint recognition has gradually become a standard component of electronic products such as mobile terminals. Since optical fingerprint recognition has stronger penetrability than capacitive fingerprint recognition, the application of optical fingerprint recognition to mobile terminals is a future development trend. However, the existing optical fingerprint recognition structure applied to mobile terminals still needs to be improved.
  • embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art. To this end, embodiments of the present invention need to provide a light sensing method of a photosensitive device.
  • the photosensitive device includes a plurality of photosensitive pixels, wherein the light sensing method comprises the following steps:
  • an output control signal is provided to the plurality of photosensitive pixels, and an electrical signal output generated when the photosensitive pixel performs light sensing is controlled.
  • the light sensing method of the embodiment of the invention can not only control the light sensing time of the photosensitive pixel, but also realize the timely and effective output of the electrical signal generated by the photosensitive unit by outputting the control signal, thereby improving the sensing precision.
  • the output of the photosensitive signal of the photosensitive pixel is controlled by the output control signal, so that the signal of the photosensitive pixel is isolated from the output end, and other circuit loads are prevented from affecting the photosensitive signal of the photosensitive pixel, thereby obtaining an accurate photosensitive signal, thereby further improving the sensing precision.
  • the plurality of photosensitive pixels are distributed in an array; and the step of sequentially providing the first scan driving signal to the plurality of photosensitive pixels further comprises:
  • the first scan driving signal is supplied to the plurality of photosensitive pixels row by row or interlaced to drive the plurality of photosensitive pixels to perform light sensing row by row.
  • the step of providing the first scan driving signal to the plurality of photosensitive pixels row by row or interlaced providing the first scan driving signal to the photosensitive pixels of the current row, and providing And outputting the control signal to the photosensitive pixel of the current row to control the output of the electrical signal generated when the photosensitive pixel of the current row performs light sensing, and then providing the first scan driving signal to the photosensitive pixel of the next row.
  • the photosensitive device in the embodiment of the present invention performs light sensing
  • the photosensitive pixels of the current row perform light sensing
  • the photosensitive signals generated when the light sensing is performed are read
  • the photosensitive pixels of the next row are executed to perform light sensing. Therefore, the reading of the photosensitive signals of each row of photosensitive pixels does not interfere with each other, so that an accurate photosensitive signal can be obtained.
  • the photosensitive device since the photosensitive device takes a long time to perform one light sensing, it can be used as a test mode.
  • the step of providing the first scan driving signal to the plurality of photosensitive pixels in a row or interlace manner providing the first scan driving signal to the photosensitive pixels of the current row and reaching a predetermined time And providing the first scan driving signal to the photosensitive pixels of the next row; the predetermined time is at least one clock cycle.
  • the embodiment of the invention adopts a method in which the photosensitive device rolls the photosensitive light, so that the photosensitive device performs a light sensing time for a short time, and all the photosensitive pixels wait for reading the photosensitive signal for the same time, that is, the charge leakage is solved for the photosensitive signal collection.
  • the resulting effect increases the accuracy of the sensing.
  • the output control signal is provided to the photosensitive pixel to control an electrical signal output generated when the photosensitive pixel performs light sensing.
  • the output control signal is used to control an electrical signal output generated when the photosensitive pixel performs photo sensing for a second predetermined time.
  • the second predetermined time is dynamically adjusted based on the intensity of the received optical signal.
  • the embodiment of the invention adjusts the reading time of the electrical signal generated by the photosensitive pixel in time according to the intensity of the optical signal, thereby ensuring accurate reading of the electrical signal, thereby improving the sensing accuracy.
  • the light sensing method further comprises:
  • Predetermining biometric information of an object contacting or approaching the photosensitive device is acquired based on the electrical signals generated when the plurality of photosensitive pixels are read to perform light sensing.
  • the predetermined biometric information includes one or more of a fingerprint, a fingerprint, a palm print, an ear print, a sole, a heart rate, a blood oxygen concentration, and a vein.
  • FIG. 1 is a schematic view showing an array distribution of photosensitive pixels in a photosensitive device according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing the circuit structure of an embodiment of the photosensitive pixel shown in FIG. 1;
  • FIG. 3 is a timing diagram of signals at respective nodes when the photosensitive pixel shown in FIG. 2 performs light sensing
  • FIG. 4 is a structure of a connection relationship between a photosensitive pixel and a scanning line, a data line, and a signal reference line in the photosensitive device according to an embodiment of the present invention, and the photosensitive pixel is a photosensitive pixel structure shown in FIG. 2;
  • FIG. 5 is a block diagram showing the structure of an embodiment of the photosensitive driving unit shown in Figure 4;
  • FIG. 6 is a signal timing diagram of an embodiment in which the photosensitive device shown in FIG. 4 performs light sensing
  • FIG. 7 is a signal timing diagram of another embodiment in which the photosensitive device shown in FIG. 4 performs light sensing
  • FIG. 8 is a schematic circuit diagram of another embodiment of the photosensitive pixel shown in FIG. 1;
  • FIG. 9 is a timing chart of signals at each node when the photosensitive pixel shown in FIG. 8 performs light sensing
  • FIG. 10 is a diagram showing a structure of a connection relationship between a photosensitive pixel and a scanning line, a data line, and a signal reference line in the photosensitive device according to an embodiment of the present invention, and the photosensitive pixel is a photosensitive pixel structure shown in FIG. 8;
  • FIG 11 is a block diagram showing the structure of an embodiment of the photosensitive driving unit shown in Figure 10;
  • FIG. 12 is a schematic structural view of a photosensitive panel in a photosensitive device according to an embodiment of the present invention.
  • FIG. 13 is a schematic flow chart of a light sensing method of a photosensitive device according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural view of an electronic device to which a photosensitive device according to an embodiment of the present invention is applied;
  • FIG. 15 is a cross-sectional view of the electronic device shown in FIG. 14 taken along line I-I, and FIG. 15 shows a partial structure of the electronic device;
  • 16 is a schematic view showing a corresponding position of a display area of a display panel and a sensing area of the photosensitive panel according to an embodiment of the present invention
  • FIG. 17 is a schematic structural view of an electronic device to which a photosensitive device according to an embodiment of the present invention is applied;
  • FIG. 18 is a cross-sectional view of the electronic device shown in FIG. 17 taken along line II-II, and FIG. 18 shows a partial structure of the electronic device.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining “first” or “second” may include one or more of the described features either explicitly or implicitly. In the description of the present invention, the meaning of “plurality” is two or more unless specifically and specifically defined. “Contact” or “touch” includes direct or indirect contact.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be mechanically connected, or may be electrically connected or may communicate with each other; may be directly connected or indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • Embodiments of the present invention provide a photosensitive device disposed in an electronic device, particularly disposed under a display screen of an electronic device.
  • the display screen has a display device that emits an optical signal, such as, but not limited to, an OLED display panel.
  • the display emits an optical signal to perform the corresponding image display.
  • the target object touches or touches the electronic device
  • the light signal emitted by the display screen reaches the target object and reflects, and the reflected light signal passes through the display screen and is received by the photosensitive device, and the light receiving device receives the light signal. Converting to an electrical signal corresponding to the optical signal to form predetermined biometric information of the target object based on the electrical signal generated by the photosensitive device.
  • the biometric information of the target object is, for example but not limited to, skin texture information such as fingerprints, palm prints, ear prints, and soles, and other biometric information such as heart rate, blood oxygen concentration, and veins.
  • the target object such as but not limited to a human body, may also be other suitable types of objects.
  • the electronic device can also provide a light source for biometric information sensing.
  • the light source emits a corresponding optical signal, such as infrared light, to achieve sensing of heart rate, blood oxygen concentration, veins, and the like of the target object.
  • Electronic devices such as, but not limited to, suitable types of electronic products such as consumer electronics, home electronics, vehicle-mounted electronics, and financial terminal products.
  • consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines.
  • Home-based electronic products such as smart door locks, TVs, refrigerators, wearable devices, etc.
  • Vehicle-mounted electronic products such as car navigation systems, car DVDs, etc.
  • Financial terminal products such as ATM machines, terminals for self-service business, etc.
  • FIG. 1 shows an array distribution structure of photosensitive pixels in a photosensitive device.
  • the photosensitive device 20 includes a plurality of photosensitive pixels 22, and the plurality of photosensitive pixels 22 are arrayed in a matrix to form a photosensitive array 201.
  • the photosensitive array 201 includes a plurality of rows of photosensitive pixels and a plurality of columns of photosensitive pixels, and each row of photosensitive pixels is spaced apart in the X direction, and each column of the photosensitive pixels is spaced apart in the Y direction.
  • each row of the photosensitive pixels 22 can be driven from the X direction to perform light sensing, and the electrical signals generated by the respective photosensitive pixels 22 to perform light sensing can be read from the Y direction.
  • each of the photosensitive pixels 22 forming the photosensitive array 201 is not limited to the vertical relationship shown in FIG. 1, and may be distributed in other regular manners or in an irregular manner.
  • each photosensitive pixel 22 includes a sensing unit and a signal output unit.
  • the sensing unit is configured to receive a light sensing control signal, and perform light sensing when receiving the light sensing control signal.
  • the sensing unit receives the optical signal and converts the received optical signal into a corresponding photosensitive signal, that is, an electrical signal;
  • the signal output unit is configured to receive the output control signal and receive the output control signal When the control signal is output, the sensing unit outputs a light sensing signal generated when the light sensing is performed.
  • FIG. 2 shows a circuit configuration of one photosensitive pixel 22 of FIG. 1. Therefore, the photosensitive pixel 22 can also be referred to as a photosensitive circuit.
  • a photosensitive pixel 22 in the embodiment of the present invention has a first input terminal In1, a second input terminal In2, a third input terminal In3, and a first output terminal Out1.
  • the light sensing control signal includes a first scan driving signal.
  • the photosensitive pixel 22 includes a sensing unit and a signal output unit 223.
  • the sensing unit further includes a switching unit 221 and a photosensitive unit 222.
  • the photosensitive unit 222 is connected between the switching unit 221 and the signal output unit 223.
  • the switch unit 221 receives a reference signal Vref through the third input terminal In3.
  • the switch unit 221 further receives a first scan driving signal through the first input terminal In1, and transmits the reference signal Vref when receiving the first scan driving signal.
  • the photosensitive unit 222 is driven to drive the photosensitive unit 222 to operate.
  • the photosensitive unit 222 is configured to receive an optical signal and convert the received optical signal into a corresponding electrical signal when the optical signal is received.
  • the signal output unit 223 receives the output control signal through the second input terminal In2, and outputs the electrical signal generated by the photosensitive unit 222 from the first output terminal Out1 according to the output control signal.
  • the first scan driving signal and the output control signal are both a pulse signal, and a duration of a high level in the first scan driving signal is a first predetermined time, and a duration of a high level in the output control signal is a second scheduled time.
  • the photosensitive unit 222 includes a photosensitive device including a first electrode for receiving the reference signal Vref transmitted by the switching unit 221 and a second electrode for receiving A fixed electrical signal.
  • a driving voltage for driving the photosensitive device is formed by applying a reference signal Vref and a fixed electrical signal to both electrodes of the photosensitive device.
  • the photosensitive device is, for example but not limited to, a photodiode D1, which may alternatively be a photo resistor, a phototransistor, a thin film transistor or the like. It should be noted that the number of photosensitive devices may also be two, three, and the like.
  • the photodiode D1 includes a positive electrode and a negative electrode, wherein the positive electrode receives a predetermined electrical signal, such as a ground signal NGND; and the negative electrode serves as a first electrode of the photosensitive device for receiving the reference signal Vref transmitted by the switching unit 221. . It should be noted that as long as the reference signal Vref is applied to both ends of the photodiode D1 corresponding to the predetermined signal, a reverse voltage can be formed across the photodiode D1, thereby driving the photodiode D1 to perform photo sensing.
  • the reference signal Vref When the switch unit 221 is closed, the reference signal Vref is transmitted to the negative terminal of the photodiode D1 through the closed switch unit 221, and since the photodiode D1 has an equivalent capacitance inside, the reference signal Verf performs the equivalent capacitance inside the photodiode D1. Charging, so that the voltage Vg on the negative electrode of the photodiode D1 gradually rises and reaches the first predetermined time, the voltage Vg reaches the voltage value of the reference signal Vref and remains unchanged. At this time, the voltage difference across the photodiode D1 will reach the reverse voltage at which the photodiode is driven, that is, the photodiode D1 is in operation.
  • the switching unit 221 Since the first scan driving signal is turned to a low level signal when the first predetermined time arrives, the switching unit 221 is turned off according to the low level signal, and a discharge loop is formed inside the photodiode D1. At this time, if an optical signal is incident on the photodiode D1, the reverse current of the photodiode D1 rapidly increases, so that the voltage Vg on the negative node of the photodiode D1 changes, that is, gradually decreases. Moreover, since the intensity of the optical signal is larger, the reverse current generated by the photodiode D1 is also larger, and the rate of decrease of the voltage Vg at the negative node of the photodiode D1 is faster.
  • the photosensitive unit 222 further includes a first capacitor c1.
  • the first capacitor c1 is used to form a discharge loop with the photosensitive device when performing light sensing to obtain a corresponding photosensitive signal.
  • the first capacitor c1 is disposed in parallel with the photosensitive device, that is, the first plate of the first capacitor c1 is connected to the cathode of the photodiode D1, and the second plate of the first capacitor c1 is connected to a predetermined one.
  • An electrical signal such as the ground signal NGND.
  • the first capacitor c1 When the reference signal Vref is transmitted to the negative electrode of the photodiode D1, the first capacitor c1 is also charged, and when the switch unit 221 is turned off, the first capacitor c1 forms a discharge loop with the photodiode D1, and the first capacitor c1
  • the voltage of one plate ie, voltage Vg
  • the capacitance capacity of the photosensitive unit 222 is increased, thereby reducing the voltage drop speed on the negative electrode of the photodiode D1, thereby ensuring that an effective photosensitive signal is obtained, and the sensing accuracy of the photosensitive device 20 on the target object is improved.
  • the first capacitor c1 is a variable capacitor, for example, a capacitor array formed by a plurality of capacitors, and the plurality of capacitors are disposed in parallel, and the capacity change of the first capacitor c1 is realized by controlling whether the plurality of capacitors are connected. Since the first capacitor c1 is set as a variable capacitor, the capacity adjustment of the first capacitor c1 is adapted to the change of the received optical signal, thereby obtaining an accurate and effective photosensitive signal. Specifically, if the intensity of the received optical signal is larger, the capacity of the first capacitor c1 is larger, and if the intensity of the received optical signal is smaller, the capacity of the first capacitor c1 is smaller.
  • the switching unit 221 includes a first transistor T1, such as but not limited to any one or several of a triode, a MOS transistor, and a thin film transistor.
  • the first transistor T1 includes a first control electrode C1, a first transfer electrode S1, and a second transfer electrode S2, wherein the first control electrode is a gate of the MOS transistor, and the first transfer electrode S1 is a MOS transistor.
  • the drain of the second transfer electrode S2 is the source of the MOS transistor.
  • the first control electrode C1 is connected to the first input terminal In1 for receiving the first scan driving signal; the first transfer electrode S1 is connected to the third input terminal In3 for receiving the reference signal Vref; the second transfer electrode S2 and the photosensitive unit
  • the negative electrode of the photodiode D1 is connected in 222.
  • signal output unit 223 includes a second transistor T2 and a buffer circuit.
  • the snubber circuit is used to buffer the electrical signal generated by the photosensitive unit 222.
  • the second transistor T2 is, for example but not limited to, one or more of a triode, a MOS transistor, and a thin film transistor. Taking the MOS transistor as an example, the second transistor T2 includes a second control electrode C2, a third transfer electrode S3, and a fourth transfer electrode S4, wherein the second control electrode C2 is the gate of the MOS transistor, and the third transfer electrode S3 is the MOS transistor. The drain of the fourth transfer electrode S4 is the source of the MOS transistor.
  • the second control electrode C2 is connected to the second input terminal In2 for receiving an output control signal;
  • the third transmission electrode S3 is connected to the buffer circuit for receiving an electrical signal output by the buffer circuit;
  • the fourth transmission electrode S4 is The first output terminal Out1 is connected for outputting an electrical signal buffered by the buffer circuit.
  • a buffer circuit is connected between the photosensitive unit 222 and the second transistor T2 for buffering the electrical signal converted by the photosensitive unit 222, and outputs a buffered electrical signal when the second transistor T2 is turned on.
  • the buffer circuit includes a third transistor T3, such as but not limited to any one or several of a triode, a MOS transistor, and a thin film transistor.
  • the third transistor T3 includes a third control electrode C3, a fifth transmission electrode S5, and a sixth transmission electrode S6, wherein the third control electrode C3 is the gate of the MOS transistor, and the fifth transmission electrode S5 is the MOS.
  • the drain of the tube, the sixth transfer electrode S6 is the source of the MOS tube.
  • the third control electrode C3 is connected to the negative electrode of the photodiode D1 for receiving an electrical signal generated when the photodiode D1 performs photo sensing; the fifth transmission electrode S5 is for receiving a voltage signal Vcc; and the sixth transmission electrode S6 is second.
  • the third transfer electrode S3 of the transistor T2 is connected for outputting a buffered electrical signal when the second transistor T2 is turned on.
  • the voltage Vs of the sixth transfer electrode S6 changes according to the voltage Vg of the third control electrode C3, that is, the sixth transfer electrode S6 is not affected regardless of the circuit load connected to the sixth transfer electrode S6. Voltage. Moreover, due to the transistor characteristics, the voltage Vs is always lower than the voltage Vg by a threshold voltage which is the threshold voltage of the third transistor T3. Therefore, the buffer circuit functions as a buffer isolation to isolate the electrical signal generated when the photosensitive unit 222 performs light sensing, thereby preventing other circuit loads from affecting the photosensitive signal generated by the photosensitive unit 222, thereby ensuring accurate execution of the photosensitive pixel 22. The light sensing improves the sensing accuracy of the photosensitive device 20 on the target object.
  • FIG. 3 shows the signal timing at each node when the photosensitive pixel 22 shown in FIG. 2 performs light sensing, wherein Vg is the voltage on the negative electrode of the photodiode D1, and is also the third of the third transistor T3. The voltage on the electrode C3 is controlled; Vs is the voltage on the sixth transfer electrode S6 of the third transistor T3.
  • the first scan driving signal is input through the first input terminal In1, so that the first transistor T1 is turned on and continues for a first predetermined time (ie, t2-t1), and is turned off.
  • the reference signal Vref is turned on.
  • the first transfer electrode S1 and the second transfer electrode S2 are transmitted to the negative electrode of the photodiode D1 and the first plate of the first capacitor c1. Since the photodiode D1 has an equivalent capacitance inside, the reference signal Verf charges the equivalent capacitance inside the photodiode D1, so that the voltage Vg on the negative electrode of the photodiode D1 gradually rises and reaches the voltage value of the reference signal Vref. constant.
  • the reference signal Vref also charges the first capacitor c1, so that the voltage on the first plate gradually rises and remains unchanged after reaching the voltage value of the reference signal Vref. .
  • the first scan driving signal changes from a high level to a low level signal, that is, the first input terminal In1 becomes a low level signal, the first transistor T1 is turned off, the equivalent capacitance and the first capacitance c1 and the photodiode D1 A discharge loop is formed between them. If there is an optical signal on the photodiode D1, a current signal proportional to the optical signal is generated inside the photodiode D1, and thus the voltage Vg on the negative electrode of the photodiode D1 gradually decreases. Moreover, the stronger the optical signal, the faster the voltage Vg is lowered.
  • the voltage Vs on the sixth transfer electrode S6 of the third transistor T3 changes with the voltage Vg on the negative electrode of the photodiode D1, and the voltage Vs is always lower than the voltage Vg by Vth, which Vth is the threshold voltage of the third transistor T3.
  • the first predetermined time is to ensure that the photodiode and the first capacitor c1 in the photosensitive unit 22 are charged to the reference signal Vref.
  • the second control terminal In2 inputs and outputs a control signal, and the second transistor T2 is turned on according to the high level signal.
  • the voltage Vs on the sixth transfer electrode S6 of the third transistor T3 is output from the first output terminal Out1 via the third transfer electrode S3 and the fourth transfer electrode S4 of the second transistor T2.
  • the voltage output from the first output terminal Out1 is gradually increased from a low level to a voltage Vs on the sixth transfer electrode S6, and then changes in accordance with a change in the voltage Vs on the sixth transfer electrode S6.
  • the fourth predetermined time is at least one clock cycle, and the fourth predetermined time is not too long, and of course, cannot be too short, so as to ensure that the photosensitive signal generated when the photosensitive unit 222 performs light sensing can be effectively and timely. Output.
  • the output control signal changes from a high level signal to a low level signal, that is, the second input terminal In2 becomes a low level signal, the second transistor T2 is turned off, and the voltage outputted by the first output terminal Out1 gradually decreases or remains unchanged. change.
  • the output voltage of the first output terminal Out1 needs to gradually drop to a low level.
  • the voltage Vs on the sixth transfer electrode S6 of the third transistor T3 (that is, the voltage Vg on the negative electrode of the photodiode D1) will be from the time between the time t4 and the time t3, that is, the second predetermined time ⁇ t1.
  • the first output terminal Out1 is outputted. Therefore, by reading the voltage signal of the first output terminal Out1, the size of the photosensitive signal generated by the photodiode D1 due to the reception of the optical signal can be obtained, thereby generating biometric information of the target object.
  • the second predetermined time ⁇ t1 may be a fixed value or a change value. Due to the larger the optical signal received by the photodiode D1, the faster the voltage Vg falls, and the faster the voltage Vs falls. Therefore, in order to achieve accurate and efficient acquisition of the photosensitive signal, according to the intensity of the received optical signal. Adjust the size of ⁇ t1. Specifically, the greater the intensity of the optical signal, the shorter the second predetermined time ⁇ t1; the smaller the intensity of the optical signal, the longer the second predetermined time ⁇ t1.
  • FIG. 4 shows a connection structure of the photosensitive pixels 22 in the photosensitive device 20 with respective scan lines, data lines, and signal reference lines, and the photosensitive pixels are the circuit structure shown in FIG. .
  • the photosensitive device 20 further includes a scan line group, a data line group, and a signal reference line group electrically connected to the plurality of photosensitive pixels 22.
  • the scan line group includes a first scan line group composed of a plurality of first scan lines and a second scan line group composed of a plurality of second scan lines
  • the data line group includes a plurality of data lines
  • the signal reference line group includes Multiple signal reference lines.
  • a row of photosensitive pixels in the X direction includes n photosensitive pixels 22 arranged at intervals, and a column of photosensitive pixels in the Y direction includes m photosensitive pixels 22 arranged at intervals, thereby
  • the photosensitive array 201 includes a total of m*n photosensitive pixels 22.
  • the first scan line group includes m first scan lines, and the m first scan lines are arranged along the Y direction, for example, G11, G12, . . . G1m; the second scan line group further includes m second scans.
  • the scan line group, the data line group, and the signal reference line group of the photosensitive device 20 may also be distributed in other regular manners or in an irregular manner.
  • the first scan line, the second scan line, the signal reference line, and the data line are electrically conductive, the first scan line, the second scan line, the signal reference line, and the data line at the intersection position are made of an insulating material. isolation.
  • the m first scan lines are connected to the first input end In1 of the plurality of photosensitive pixels 22, and the m second scan lines are connected to the second input end In2 of the plurality of photosensitive pixels 22, and the m signal reference lines are connected.
  • the n data lines are connected to the first output end Out1 of the plurality of photosensitive pixels 22.
  • the first scan line, the second scan line, and the signal reference line are all drawn from the X direction, and the data line is taken out from the Y direction.
  • the photosensitive device 20 further includes a photosensitive driving circuit for sequentially driving the plurality of photosensitive pixels 22 to perform light sensing; after the photosensitive pixels 22 start performing light sensing, controlling The photosensitive pixel 22 performs an electrical signal output generated when light sensing is performed.
  • the photosensitive driving circuit includes a photosensitive driving unit 24, and the first scanning line, the second scanning line, and the signal reference line in the photosensitive device 20 are all connected to the photosensitive driving unit 24.
  • FIG. 5 shows the structure of an embodiment of the photosensitive driving unit 24 of FIG.
  • the photosensitive driving unit 24 includes a first driving circuit 241 that supplies a first scan driving signal, a second driving circuit 242 that provides an output control signal, and a reference circuit 243 that supplies a reference signal Vref.
  • the circuits of the photosensitive driving unit 24 can be integrated into one control chip through a silicon process. Of course, the circuits of the photosensitive driving unit 24 can also be formed separately in different control chips.
  • the first driving circuit 241 and the second driving circuit 242 are formed on the same substrate together with the photosensitive pixels 22, and the reference circuit 243 passes through a connecting member (for example, a flexible circuit board) and a plurality of signal reference lines on the photosensitive device 20. connection.
  • a connecting member for example, a flexible circuit board
  • the reference circuit 243 is configured to provide a reference signal Vref that is selectable by a first switch of the photosensitive pixel 22 (eg, the first transistor T1 in the switching unit 221 shown in FIG. 2) The ground is electrically connected to the photosensitive unit 222. When the first switch is closed, the reference signal Vref is transmitted to the corresponding photosensitive unit 222 through the closed first switch.
  • the first driving circuit 241 is electrically connected to the first scan line of the photosensitive device 20 for providing a first scan driving signal to the first switch in the photosensitive pixel 22 row by row or interlaced to control the first switch to be closed, and in the first When a predetermined time arrives, the first switch is controlled to be turned off, thereby driving the photosensitive unit 222 to start performing light sensing.
  • the second driving circuit 242 is electrically connected to the second scan line of the photosensitive device 20 for performing light sensing at each photosensitive pixel and reaching a fourth predetermined time, that is, the first switch is turned off and reaches a fourth predetermined time. (for example, t3-t2 shown in FIG. 3), an output control signal is supplied to the second switch in the photosensitive pixel 22 (for example, the second transistor T2 in the signal output unit 223 shown in FIG. 2), and the second is controlled. The switch is closed to cause the photosensitive unit 222 to output an electrical signal generated when the light is sensed.
  • the first driving circuit 241 is further configured to: provide the first scan driving signal to the photosensitive pixel of the current row, and provide the output control signal to the photosensitive pixel of the current row, After the light sensing is performed by driving the photosensitive pixel of the current line, and the electrical signal generated when the photosensitive pixel performs light sensing is controlled to be output, the first scanning driving signal is further supplied to the photosensitive pixel of the next row.
  • the photosensitive pixels of the next row herein are not limited to one row of photosensitive pixels adjacent to the photosensitive pixels of the current row, and may also be referred to as interlaced photosensitive pixels.
  • FIG. 6 shows a timing when the photosensitive device shown in FIG. 4 performs light sensing, and the photosensitive device performs light sensing by progressively sensing in a line-by-line manner.
  • time t 1 a first scan driving signal to the sensing pixels in the first row, the first row to drive the photosensitive pixels perform light sensing
  • t 2 time provides an output control signal to the photosensitive pixels of the first row, in order to control the first photosensitive photosensitive pixel output signal line
  • t 3 time providing the photosensitive pixels of the first scan driving signal to the second row, the second row to drive the photosensitive pixels perform light sensing
  • t 4 time provides an output control signal to the second line Sensing pixel to control the photosensitive signal output of the second row of the photosensitive signal...
  • t 2m-1 providing the first scan driving signal to the photosensitive pixel of the mth row to drive the mth row of photosensitive pixels to perform light sensing
  • an output control signal is supplied to the photosensitive pixels of the mth line to control the photosensitive pixels of the mth line to output a photosensitive signal.
  • the photosensitive device in the embodiment of the present invention performs light sensing
  • the photosensitive pixels of the current row perform light sensing
  • the photosensitive signals generated when the light sensing is performed are read
  • the photosensitive pixels of the next row are executed to perform light sensing. Therefore, the reading of the photosensitive signals of each row of photosensitive pixels does not interfere with each other, so that an accurate photosensitive signal can be obtained.
  • the photosensitive device since the photosensitive device takes a long time to perform one light sensing, it can be used as a test mode.
  • the first driving circuit 241 is further configured to: when the first scan driving signal is supplied to the photosensitive pixel of the current row and reach a predetermined time, the first scan driving signal is provided to the next row Sensing pixels; the predetermined time is at least one clock cycle.
  • the photosensitive signals in the photosensitive pixels 22 are output through the control of the output control signals, the light sensing times of the photosensitive pixels of different rows may overlap, that is, when the photosensitive pixels of the current row perform light sensing, the first scan may be provided.
  • the driving signal is sent to the photosensitive pixel of the next row to drive the photosensitive pixel to perform light sensing.
  • the photosensitive pixels of the next row herein are not limited to one row of photosensitive pixels adjacent to the photosensitive pixels of the current row, and may also be referred to as interlaced photosensitive pixels.
  • a timing when the photosensitive device shown in Fig. 4 performs light sensing, which performs rolling sensing in a line-by-line manner time t 11, a first scan driving signal to the sensing pixels in the first row, the first row to drive the photosensitive pixels perform light sensing, t 12 time, providing a first driving signal to the scan line of the photosensitive pixel 2, to drive line 2 performs light sensing photosensitive pixels, t 13 time, providing a first driving signal to the scanning line 3 of the photosensitive pixel, to drive the third row of pixels perform light sensing photosensitive, so, t 1m time, providing a first A scan driving signal is applied to the photosensitive pixels of the mth row to drive the mth row of photosensitive pixels to perform light sensing.
  • an output control signal is supplied to the photosensitive pixels of the row.
  • t 21 time provides an output control signal to the photosensitive pixels of the first row, in order to control the photosensitive signal output line of the first photosensitive pixels
  • t 22 time supplied to the second row of the photosensitive pixel outputs a control signal to control the second row of the photosensitive The photosensitive signal output of the pixel.
  • the photosensitive device 20 performs a light sensing time for a short time, and all the photosensitive pixels wait for the reading of the photosensitive signal for the same time, that is, the influence of the charge leakage on the photosensitive signal collection is solved, thereby improving the sense. Measurement accuracy.
  • the photosensitive driving circuit further includes a signal processing unit 25, and the data lines in the photosensitive device 20 shown in FIG. 4 are connected to the signal processing unit 25, and the signal processing unit 25 can be Integrated in a test chip by a silicon process.
  • the signal processing unit 25 can also be integrated with the photosensitive driving unit 24 in one processing chip.
  • the signal processing unit 25 is configured to read an electrical signal generated when the photosensitive unit 222 performs light sensing, and obtain a predetermined biological object that contacts or approaches the target object of the photosensitive panel according to the read electrical signal. Feature information. It can be understood that, in order to collect an accurate and effective electrical signal, the signal processing unit 25 can perform multiple readings on the electrical signal generated when the photosensitive unit 222 performs light sensing for a second predetermined time.
  • the signal processing unit 25 includes a plurality of processing channels, and optionally each processing channel is connected to a data line. However, it is also possible to change at least two data lines corresponding to each processing channel, and to select an electrical signal on one data line each time by means of time division multiplexing, and then select another data line. Electrical signals, and so on, until the electrical signals on all data lines are read. In this way, the number of processing channels can be reduced, thereby saving the cost of the photosensitive device 20.
  • FIG. 8 shows another circuit structure of one photosensitive pixel 22 in FIG.
  • a photosensitive pixel 22 in the embodiment of the present invention has a first input terminal In1', a second input terminal In2', a third input terminal In3', a fourth input terminal In4, and a first output terminal Out1' and a second output. End Out2.
  • the light sensing control signal includes a first scan driving signal.
  • the photosensitive pixel 22 includes a sensing unit and a signal output unit 223'.
  • the sensing unit specifically includes a switching unit 221 ′ and a photosensitive unit 222 ′.
  • the switch unit 221' receives a reference signal Vref through the third input terminal In3'.
  • the switch unit 221' further receives a first scan driving signal through the first input terminal In1', and receives the first scan driving signal.
  • the signal output unit 223' receives an output control signal through the second input terminal In2', and receives through the fourth input terminal In4.
  • a constant electrical signal Is to convert the constant electrical signal Is into two different electrical signals according to an electrical signal generated when the photosensitive unit 222' performs light sensing upon receiving the output control signal, and from the first output terminal Out1' And outputted by the second output terminal Out2.
  • the first scan driving signal and the output control signal are both a pulse signal, and the duration of the high level signal in the first scan driving signal is a first predetermined time, and the duration of the high level in the output control signal is Two scheduled times.
  • the switch unit 221' when receiving the first scan driving signal, the switch unit 221' is closed according to the high level signal and turned off according to the low level signal. Therefore, the photosensitive unit 222' receives the reference signal Vref transmitted from the switching unit 221', and when the first predetermined time arrives, starts performing light sensing.
  • the photosensitive unit 222' includes a first branch circuit 2221 and a second branch circuit 2222.
  • the first branch circuit 2221 is configured to perform light sensing, that is, receive the optical signal, and convert the received optical signal into a corresponding electrical signal;
  • the second branch circuit 2222 is configured to use the first end of the second branch circuit 2222.
  • the electrical signal is maintained at the amplitude of the reference signal Vref.
  • the photosensitive unit 222' is similar in structure to the photosensitive unit 222 shown in FIG. 2.
  • the photosensitive unit 222' includes a second capacitor c2 in addition to the structure of the photosensitive unit 222 shown in FIG.
  • the first capacitor c1 is the first branch circuit 2221 of the photosensitive unit 222'
  • the second capacitor c2 is the second branch circuit 2222 of the photosensitive unit 222'.
  • the first electrode of the photodiode D1 and the first plate of the first capacitor c1 are defined as the first end of the first branch circuit 2221, the anode of the photodiode D1 and the second plate of the first capacitor c1. It is the second end of the first branch circuit 2221.
  • the operation principle of the first branch circuit 2221 is as described in the foregoing description.
  • the first plate of the second capacitor c2 is used for receiving the reference signal Vref transmitted from the switch unit 221', and the second plate is for receiving a fixed electrical signal, such as the ground signal NGND.
  • the reference signal Vref charges the second capacitor c2 such that the voltage Vn on the first plate of the second capacitor c2 gradually rises and remains unchanged after reaching the amplitude of the reference signal Vref.
  • the first plate defining the second capacitor c2 is the first end of the second branch circuit 2222
  • the second plate of the second capacitor c2 is the second end of the second branch circuit 2222.
  • the switching unit 221 includes a fourth transistor T4 and a fifth transistor T5.
  • the fourth transistor T4 and the fifth transistor T5 are, for example but not limited to, any one or several of a triode, a MOS transistor, and a thin film transistor.
  • the fourth transistor T4 includes a fourth control electrode C4, a seventh transmission electrode S7, and an eighth transmission electrode S8, wherein the fourth control electrode C4 is the gate of the MOS transistor, and the seventh transmission electrode S7 is the MOS.
  • the drain of the tube, the eighth transfer electrode S8 is the source of the MOS tube.
  • the fifth transistor T5 includes a fifth control electrode C5, a ninth transfer electrode S9, and a tenth transfer electrode S10, wherein the fifth control electrode C5 is the gate of the MOS transistor, and the ninth transfer electrode S9 is the drain of the MOS transistor, the tenth The transfer electrode S10 is the source of the MOS transistor.
  • the fourth control electrode C4 and the fifth control electrode C5 are both connected to the first input terminal In1' for receiving the first scan driving signal; the seventh transmitting electrode S7 and the ninth transmitting electrode S9 are both connected to the third input terminal In3'.
  • the eighth transmission electrode S8 is connected to the first end of the first branch circuit 2221 of the photosensitive unit 222', and is configured to transmit the reference signal Vref to the photosensitive unit 222 when the fourth transistor T4 is turned on.
  • a tenth transmission electrode S10 is coupled to the first end of the second branch circuit 2222 of the photosensitive unit 222' for transmitting the reference signal Vref to the photosensitive unit 222 when the fifth transistor T5 is turned on 'Second branch circuit 2222.
  • the signal output unit 223' in the present embodiment includes a sixth transistor T6 and a conversion circuit 2231.
  • the sixth transistor T6 is, for example but not limited to, one or more of a triode, a MOS transistor, and a thin film transistor.
  • the sixth transistor T6 includes a sixth control electrode C6, an eleventh transmission electrode S11, and a twelfth transmission electrode S12, wherein the sixth control electrode C6 is the gate of the MOS transistor, and the eleventh transmission electrode S11 The drain of the MOS transistor, the twelfth transfer electrode S12 is the source of the MOS transistor.
  • the sixth control electrode C6 is connected to the second input terminal In2' for receiving the output control signal; the eleventh transmission electrode S11 is connected to the fourth input terminal In4 for receiving a constant current signal Is, and the twelfth transmission electrode S12 It is connected to the conversion circuit 2231.
  • the sixth transistor T6 is turned on according to an output control signal to transmit a constant current signal Is to the conversion circuit 2231.
  • the conversion circuit 2231 includes a differential pair tube having three input terminals and two output terminals, wherein one input terminal is connected to the twelfth transmission electrode S12 of the sixth transistor T6 for receiving the sixth transistor
  • the constant current signal Is is converted into two different current signals Ip and In, and the sum of the amplitudes of the two different current signals is equal to the amplitude of the constant current signal Is.
  • the conversion circuit 2231 includes a seventh transistor T7 and an eighth transistor T8.
  • the seventh transistor T7 and the eighth transistor T8 are, for example but not limited to, any one or more of a triode and a MOS transistor.
  • the seventh transistor T7 includes a seventh control electrode C7, a thirteenth transmission electrode S13, and a fourteenth transmission electrode S14, wherein the seventh control electrode C7 is the gate of the MOS transistor, and the thirteenth transmission electrode S13 is the drain of the MOS transistor, and the fourteenth transfer electrode S14 is the source of the MOS transistor.
  • the eighth transistor T8 includes an eighth control electrode C8, a fifteenth transmission electrode S15, and a sixteenth transmission electrode S16, wherein the eighth control electrode C8 is the gate of the MOS transistor, and the fifteenth transmission electrode S15 is the drain of the MOS transistor.
  • the sixteenth transmission electrode S16 is the source of the MOS transistor.
  • the seventh control electrode C7 of the seventh transistor T7 is connected to the first end of the first branch circuit 2221 (such as the first plate of the first capacitor c1); the twelfth transmission of the thirteenth transfer electrode S13 and the sixth transistor T6
  • the electrode S12 is connected to receive the constant current signal Is transmitted by the sixth transistor T6; the fourteenth transmission electrode S14 is connected to the first output terminal Out1' for outputting a current signal Ip.
  • the eighth control electrode C8 of the eighth transistor T8 is connected to the first end of the second branch circuit 2222 (such as the first plate of the second capacitor c2); the twelfth transmission of the fifteenth transfer electrode S15 and the sixth transistor T6
  • the electrode S12 is connected for receiving the constant current signal Is transmitted by the sixth transistor T6; the sixteenth transmission electrode S16 is connected to the second output terminal Out2 for outputting another current signal In.
  • the seventh transistor T7 and the eighth transistor T8 form a differential pair tube when the voltage Vp on the seventh control electrode C7 of the seventh transistor T7 and the voltage Vn on the eighth control electrode C8 of the eighth transistor T8 are equal.
  • the differential pair tube is in an equilibrium state, and the fourteenth transfer electrode S14 of the seventh transistor T7 and the sixteenth transfer electrode S16 of the eighth transistor T8 output current signals of equal amplitude.
  • the differential pair tube outputs differential electrical signals having different magnitudes.
  • FIG. 9 is a timing diagram of signals at each node when the photosensitive pixel 22 of FIG. 8 performs light sensing, wherein Vp is a negative voltage of the photodiode D1 and a voltage signal on the first plate of the first capacitor c1; It is a voltage signal on the first plate of the second capacitor c2; Ip is a current signal output from the fourteenth transmission electrode S14 of the seventh transistor T7, and In is a current signal output from the sixteenth transmission electrode S16 of the eighth transistor T8.
  • the first scan driving signal is input through the first input terminal In1', and the fourth transistor T4 and the fifth transistor T5 are turned on according to the high level signal.
  • the reference signal Vref is transmitted to the negative electrode of the photodiode D1 and the first plate of the first capacitor c1 via the seventh transfer electrode S7 and the eighth transfer electrode S8. Since the photodiode D1 has an equivalent capacitance inside, the reference signal Verf charges the equivalent capacitance inside the photodiode D1, so that the voltage Vp on the cathode of the photodiode D1 gradually rises and reaches the voltage value of the reference signal Vref. constant. In addition, the reference signal Vref also charges the first capacitor c1 such that the voltage on the first plate of the first capacitor c1 gradually rises and remains unchanged after reaching the voltage value of the reference signal Vref.
  • the reference signal Vref is transmitted to the first plate of the second capacitor c2 via the ninth transfer electrode S9 and the tenth transfer electrode S10, thereby charging the second capacitor c2, and the second capacitor c2
  • the voltage Vn on the second plate gradually rises and remains unchanged after reaching the voltage value of the reference signal Vref.
  • the first scan driving signal is changed from the high level signal to the low level signal, so the first input terminal In1 becomes a low level signal, and the fourth transistor T4 and the fifth transistor T5 are both turned off.
  • the fourth transistor T4 is turned off, a discharge circuit is formed between the equivalent capacitance and the first capacitor c1 and the photodiode D1.
  • the photosensitive unit 222' starts performing light sensing.
  • a current signal proportional to the optical signal is generated inside the photodiode D1, and thus the voltage Vp on the negative electrode of the photodiode D1 gradually decreases.
  • the stronger the optical signal the faster the voltage Vp is lowered.
  • the fifth transistor T5 is turned off, since the second capacitor c2 cannot form a discharge loop, the voltage Vn on the first plate of the second capacitor c2 remains unchanged.
  • the output control signal is input through the second input terminal In2', the sixth transistor T6 is turned on according to the high level signal, and the constant current signal Is is transmitted to the conversion circuit 2231.
  • the conversion circuit 2231 outputs two current signals having different amplitudes in accordance with the voltage difference between the voltage Vp and the voltage Vn. As the voltage Vp decreases, the voltage difference between the voltage Vn and the voltage Vp becomes larger and larger, so that the differential pair tube outputs two current signals of different amplitudes. As shown in FIG. 9, the amplitude of the current signal Ip outputted by the first output terminal Out1' decreases as the voltage Vp decreases.
  • the amplitude of the current signal In outputted by the second output terminal Out2 is low.
  • the level gradually rises to the current value corresponding to the voltage Vn and then rises as the current signal Ip decreases.
  • the electrical signal output is doubled compared to the one electrical signal, thereby achieving signal amplification.
  • the output control signal is converted from a high level signal to a low level signal, so that the second input terminal In2' becomes a low level signal, the sixth transistor T6 is turned off, the first output terminal Out1' and the second output terminal Out2 stops outputting an electrical signal and becomes a low level signal.
  • the above-mentioned time t4 and time t3 are defined as a second predetermined time ⁇ t1, during which the corresponding current signal is obtained from the first output terminal Out1' and the second output terminal Out2, and according to the two current signals.
  • the size of the photosensitive signal generated by the photosensitive unit 222' to perform light sensing can be obtained, thereby generating biometric information of the target object.
  • the second predetermined time ⁇ t1 may be a fixed value or a change value. Since the optical signal received by the photodiode D1 is larger, the rate of decrease of the voltage Vp is faster. Therefore, in order to achieve accurate and efficient acquisition of the photosensitive signal, the magnitude of ⁇ t1 is adjusted according to the intensity of the received optical signal. Specifically, the greater the intensity of the optical signal, the shorter ⁇ t1; the smaller the intensity of the optical signal, the longer ⁇ t1.
  • the interval between the above time t3 and the time t2 cannot be too long or too short to ensure that the photosensitive signal is outputted in time and efficiently. Because at time t2, the photosensitive unit 222' starts to perform light sensing, and a corresponding electrical signal is generated. If the interval time is too long, the photosensitive signal may be output in time. If the interval time is too short, the photosensitive unit 222' may generate an effective photosensitive signal in the future. The electric signal generated by the photosensitive unit 222' can be controlled to be outputted in time and efficiently.
  • the photosensitive pixel 22 of the embodiment of the present invention can ensure the timely and effective output of the photosensitive signal by the output control of the photosensitive signal, and the current signal generated by the photosensitive unit 222 performing the light sensing is converted into two differential signals by the conversion circuit 2231.
  • the output is such that amplification of the electrical signal is achieved, and the sensing accuracy of the photosensitive device 20 is improved.
  • the two differential signals are current signals, the output of the relative voltage signal improves the anti-interference ability of the signal, and further improves the sensing accuracy of the photosensitive device 20.
  • FIG. 10 illustrates a connection structure between a photosensitive pixel and a scan line, a data line, and a signal reference line in a photosensitive device according to another embodiment of the present invention, and the photosensitive pixel is illustrated in FIG. Circuit structure.
  • the photosensitive device 20 further includes a scan line group, a data line group, and a signal reference line group electrically connected to the plurality of photosensitive pixels 22.
  • the scan line group includes a first scan line group composed of a plurality of first scan lines and a second scan line group composed of a plurality of second scan lines
  • the data line group includes a plurality of first data lines and a plurality of strips.
  • Two data lines, a plurality of third data lines, and the signal reference line group includes a plurality of signal reference lines.
  • the photosensitive array 201 in FIG. 1 As an example, in the photosensitive array 201, one row of photosensitive pixels in the X direction includes n photosensitive pixels 22 arranged at intervals, and one column of photosensitive pixels in the Y direction includes m photosensitive pixels 22 arranged at intervals. Therefore, the photosensitive array 201 includes a total of m*n photosensitive pixels. The number of scanning line groups, data line groups, and signal reference line groups connected to the photosensitive pixels 22 is set correspondingly.
  • the first scan line group includes m first scan lines and m second scan lines, and the m first scan lines are arranged along the Y direction, for example, G11, G12, . . . G1m, the m second The scan lines are also arranged in the Y direction, for example, G21, G22, ... G2m.
  • the signal reference line group includes m signal reference lines, and the m signal reference lines are arranged in the Y direction, for example, L1, L2, ..., Lm.
  • the data line group includes n first data lines, n second data lines, and n third data lines, and the n first data lines are arranged along the X direction, for example, S11, S12, ..., S1n;
  • the second data lines are also arranged in the X direction, for example, S21, S22, ..., S2n;
  • the n third data lines are also arranged in the X direction, for example, S31, S32, ..., S3n.
  • the scan line group, the data line group, and the signal reference line group of the photosensitive device 20 may also be distributed in other regular manners or in an irregular manner.
  • the first scan line, the second scan line, the signal reference line, and the first data line, the second data line, and the third data line are all electrically conductive, the lines in the intersecting position are isolated by an insulating material. .
  • the m first scan lines are connected to the first input end In1 ′ of the plurality of photosensitive pixels 22
  • the m second scan lines are connected to the second input end In 2 ′ of the plurality of photosensitive pixels 22
  • m signals are connected.
  • the reference line is connected to the third input end In3 ′ of the plurality of photosensitive pixels 22
  • the n first data lines are correspondingly connected to the first output end Out1 ′ of the plurality of photosensitive pixels 22
  • the n second data lines are corresponding to the plurality of
  • the second output terminal Out2 of the photosensitive pixel 22 is connected
  • the third data line is connected to the fourth input terminal In4 of the photosensitive pixel 22.
  • the first scan line, the second scan line, and the signal reference line are all drawn from the X direction, and the first data line and the second data line are taken out from the Y direction.
  • the photosensitive device 20 further includes a photosensitive driving circuit for sequentially driving the plurality of photosensitive pixels to perform light sensing; and after the photosensitive pixels start performing light sensing, controlling the photosensitive The electrical signal output generated when the pixel performs light sensing.
  • the photosensitive driving circuit includes a photosensitive driving unit 24, and the first scanning line, the second scanning line, and the signal reference line in the photosensitive device 20 are both connected to the photosensitive driving unit 24.
  • FIG. 11 shows a functional module of a photosensitive driving unit according to an embodiment of the present invention.
  • the photosensitive driving unit 24 includes a first driving circuit 241' that supplies a first scan driving signal, a second driving circuit 242' that provides an output control signal, and a reference circuit 243' that supplies a reference signal Vref.
  • the circuits of the photosensitive driving unit 24 can be integrated into one control chip through a silicon process. Of course, the circuits of the photosensitive driving unit 24 can also be formed separately in different control chips.
  • the first driving circuit 241' and the second driving circuit 242' are formed on the same substrate together with the photosensitive pixels 22, and the reference circuit 243' passes through a plurality of signals of the photosensitive device 20 through a connecting member (for example, a flexible circuit board). Reference line connection.
  • the reference circuit 243' is for providing a reference signal Vref that passes through a third switch of the photosensitive pixel 22 (eg, the fourth transistor T4 in the switching unit 221' shown in FIG. 8)
  • the first branch circuit 2221 of the photosensitive unit 222' is selectively electrically connected.
  • the third switch is closed, the reference signal Vref is transmitted to the first branch circuit 2221 of the corresponding photosensitive unit 222' through the closed third switch.
  • the reference circuit 243' is further selectively connected to the second branch of the photosensitive unit 222' through a fourth switch of the photosensitive pixel 22 (for example, the fifth transistor T5 in the switching unit 221' shown in FIG. 8).
  • Circuit 2222 is electrically connected.
  • the fourth switch is closed, the reference signal Vref is transmitted to the second branch circuit 2222 of the corresponding photosensitive unit 222' through the closed fourth switch.
  • the first driving circuit 241 ′ is electrically connected to the first scan line of the photosensitive device 20 for providing a first scan driving signal to the third switch and the fourth switch of the plurality of photosensitive pixels 22 row by row or interlaced to
  • the third switch and the fourth switch are controlled to be closed, and when the first predetermined time arrives, the third switch and the fourth switch are controlled to be turned off, thereby driving the photosensitive unit 222' to start performing light sensing.
  • the second driving circuit 242 ′ is electrically connected to the second scan line of the photosensitive device 20 for performing the light sensing after the driving of the photosensitive unit 222 ′, for example, the third switch and the fourth switch are turned off and reach the fourth predetermined time. (t3-t2 shown in FIG. 9), an output control signal is supplied to the fifth switch (for example, the sixth transistor T6 in the signal output unit 223' shown in FIG. 8) to control the fifth switch to be closed, and When the predetermined time arrives, the fifth switch is turned off, so that the conversion circuit 2231 converts the constant current signal into two different current signals according to the electric signal generated when the photosensitive unit 222' performs light sensing, and outputs it.
  • the fifth switch for example, the sixth transistor T6 in the signal output unit 223' shown in FIG. 8
  • the manner in which the first driving circuit 241 ′ controls the plurality of photosensitive pixels 22 is the same as the manner in which the first driving circuit 241 controls the plurality of photosensitive pixels 22 . That is, the first scan driving signal is supplied to the photosensitive pixel of the current line, and the output control signal is supplied to the photosensitive pixel of the current line to control the electrical signal generated when the photosensitive pixel of the current line performs light sensing.
  • the first scan driving signal is further supplied to the photosensitive pixels of the next row, thereby realizing the progressive sensing of the photosensitive pixels 22, and reading out line by line; or, providing the first scanning driving signal to the photosensitive pixels of the current line and
  • the predetermined time is at least one clock cycle, thereby achieving rolling sensitivity of the photosensitive pixels 22, and reading out line by line.
  • the photosensitive drive circuit further includes a signal processing unit 25, and the data line groups in the photosensitive device 20 shown in FIG. 10 are all connected to the signal processing unit 25.
  • the third data line is connected, for example, to a constant current source (not shown) for providing a constant current signal; the first data line and the second data line are connected, for example, to a signal processing circuit (FIG. Not shown).
  • the signal processing unit 25 can also be integrated with the photosensitive driving unit 24 in one processing chip.
  • the signal processing unit 25 is configured to read an electrical signal generated when the photosensitive unit 222' performs light sensing, and obtain predetermined biometric information of a target object contacting or approaching the photosensitive device according to the read electrical signal. .
  • the signal processing unit 25 can be integrated in a detection chip by a silicon process. It can be understood that, in order to collect an accurate and effective electrical signal, the signal processing unit 25 can perform multiple readings on the electrical signal generated when the photosensitive unit 222' performs light sensing for a second predetermined time.
  • the signal processing unit 25 includes a plurality of processing channels.
  • each processing channel is connected to a first data line and a second data line.
  • at least two first data lines and at least two second data lines may be connected to each processing channel, and one first data line and one piece are selected to be read each time by means of time division multiplexing.
  • An electrical signal on the second data line, then another electrical signal on the first data line and the second data line, and so on, until all electrical signals on the first data line and the second data line are read take. In this way, the number of processing channels can be reduced, thereby saving the cost of the photosensitive device 20.
  • FIG. 12 shows the structure of a photosensitive device according to another embodiment of the present invention.
  • the photosensitive device 20 further includes a photosensitive panel 200.
  • the photosensitive panel 200 further includes a substrate 26 on which a plurality of photosensitive pixels 22 are disposed.
  • the photosensitive pixels 22 are distributed in an array.
  • the photosensitive driving circuit is configured to drive the plurality of photosensitive pixels to perform light sensing, and control an electrical signal output generated when the photosensitive pixel performs light sensing.
  • the photosensitive pixel 22 When the photosensitive pixel 22 performs light sensing, it is used to receive the above-mentioned optical signal, and convert the received optical signal into a corresponding electrical signal, so that the photosensitive regions of the plurality of photosensitive pixels 22 define the sensing region 203, and the sense The area other than the measurement area 203 is the non-sensing area 202.
  • the non-sensing area 202 is used to set a driving circuit required for the photosensitive pixel 22 to perform light sensing, such as the above-described photosensitive driving circuit.
  • the non-sensing area 202 is used to set a line bonding area to which the power supply connector is connected. For example, taking the photosensitive driving circuit shown in FIG.
  • the first driving circuit 241' and the second driving circuit 242' and the reference circuit 243' are both formed on the substrate 26.
  • the first driving circuit 241 ′, the second driving circuit 242 ′, and the reference circuit 243 ′ are electrically connected to the photosensitive pixels 22 through electrical connectors (eg, flexible circuit boards).
  • the signal processing unit 25 described above can be selectively formed on the substrate 26 depending on the type of the substrate 26, or can be selectively electrically connected to the photosensitive pixel 22, for example, by an electrical connector (eg, a flexible circuit board).
  • an electrical connector eg, a flexible circuit board
  • the signal processing unit 25 may be selectively formed on the substrate 26, or may be electrically connected to the photosensitive pixel 22, for example, by a flexible circuit board; when the substrate 26 is an insulating substrate The signal processing unit 25 then needs to be electrically connected to the photosensitive pixels 22, for example, via a flexible circuit board.
  • the photosensitive device 20 is a photosensitive chip for sensing biometric information of a target object that contacts or approaches the photosensitive device 20.
  • the photosensitive device 20 is a fingerprint sensing chip for sensing a fingerprint image of a user's finger.
  • an embodiment of the present invention further provides a light sensing method of the photosensitive device.
  • FIG. 13 shows specific steps of a light sensing method of a photosensitive device according to an embodiment of the present invention.
  • the light sensing method of the photosensitive device includes the following steps:
  • Step S21 sequentially providing a first scan driving signal to the plurality of photosensitive pixels, so that the photosensitive pixels start to perform light sensing when the first predetermined time arrives;
  • Step S22 after the photosensitive pixel starts performing light sensing, providing an output control signal to the plurality of photosensitive pixels, and controlling an electrical signal output generated when the photosensitive pixel performs light sensing.
  • step S21 may specifically include: providing the first scan driving signal to the plurality of photosensitive pixels in a row or interlace driving to drive the photosensitive pixels to perform light sensing. This makes it possible to drive a row of photosensitive pixels at a time to perform light sensing, thereby speeding up the sensing speed.
  • step S21 is specifically: sequentially providing a first scan driving signal to the first switch of the plurality of photosensitive pixels 22 (for example, FIG. 2
  • the first transistor T1) in the illustrated switching unit 221 controls the first switch to be closed, and when the first predetermined time arrives, controls the first switch to be turned off, thereby driving the photosensitive unit 222 to start performing light sensing.
  • Step S22 is specifically: after the first switch of the switch unit 221 is turned off, providing a second switch for outputting a control signal to the plurality of photosensitive pixels 22 (for example, the second transistor T2 in the signal output unit 223 shown in FIG. 2)
  • the second switch is controlled to be closed so that the photosensitive unit 222 performs an electrical signal output generated when the light is sensed.
  • step S11 is specifically: sequentially providing a first scan driving signal to a third switch of the plurality of photosensitive pixels 22 (for example, as shown in FIG. a fourth transistor T4) in the switching unit 221' and a fourth switch (for example, the fifth transistor T5 in the switching unit 221' shown in FIG. 8) to control the third switch and the fourth switch to be closed, and in the When a predetermined time arrives, the third switch and the fourth switch are controlled to be turned off, thereby driving the photosensitive unit 222' to start performing light sensing.
  • a third switch of the plurality of photosensitive pixels 22 for example, as shown in FIG. a fourth transistor T4
  • a fourth switch for example, the fifth transistor T5 in the switching unit 221' shown in FIG. 8
  • Step S22 is specifically: when the third switch and the fourth switch are turned off and reach the fourth predetermined time (t3-t2 shown in FIG. 9), the output control signal is provided to the fifth switch (for example, the signal output unit shown in FIG. 8)
  • the sixth transistor T6) of 223' is configured to control the fifth switch to be closed, and when the second predetermined time is reached, control the fifth switch to be turned off, so that the conversion circuit 2231 performs electricity generated when the light sensing is performed according to the photosensitive unit 222'
  • the signal converts the constant current signal into two different current signals and outputs them.
  • the step S21 further includes: providing the first scan driving signal to the photosensitive pixel of the current row, and providing the output control signal to the photosensitive pixel of the current row to control the After the photosensitive pixels of the current row perform the electrical signal output generated during the light sensing, the first scan driving signal is supplied to the photosensitive pixels of the next row.
  • the photosensitive pixels of the next row herein are not limited to one row of photosensitive pixels adjacent to the photosensitive pixels of the current row, and may also be referred to as interlaced photosensitive pixels.
  • the photosensitive device performs light sensing in a line-by-line sensing manner by progressive sensing.
  • time t 1 a first scan driving signal to the sensing pixels in the first row, the first row to drive the photosensitive pixels perform light sensing
  • t 2 time provides an output control signal to the photosensitive pixels of the first row, in order to control the first photosensitive photosensitive pixel output signal line
  • t 3 time providing the photosensitive pixels of the first scan driving signal to the second row, the second row to drive the photosensitive pixels perform light sensing
  • t 4 time provides an output control signal to the second line Sensing pixel to control the photosensitive signal output of the second row of the photosensitive signal...
  • t 2m-1 providing the first scan driving signal to the photosensitive pixel of the mth row to drive the mth row of photosensitive pixels to perform light sensing
  • an output control signal is supplied to the photosensitive pixels of the mth line to control the photosensitive pixels of the mth line to output a photosensitive signal.
  • the photosensitive device in the embodiment of the present invention performs light sensing
  • the photosensitive pixels of the current row perform light sensing
  • the photosensitive signals generated when the light sensing is performed are read
  • the photosensitive pixels of the next row are executed to perform light sensing. Therefore, the reading of the photosensitive signals of each row of photosensitive pixels does not interfere with each other, so that an accurate photosensitive signal can be obtained.
  • the photosensitive device since the photosensitive device takes a long time to perform one light sensing, it can be used as a test mode.
  • the step S21 further includes: providing the first scan driving signal to the photosensitive pixels of the next row when the first scan driving signal is supplied to the photosensitive pixels of the current row for a predetermined time
  • the predetermined time is at least one clock cycle.
  • the photosensitive signals in the photosensitive pixels 22 are output through the control of the output control signals, the light sensing times of the photosensitive pixels of different rows may overlap, that is, when the photosensitive pixels of the current row perform light sensing, the first scan may be provided.
  • the driving signal is sent to the photosensitive pixel of the next row to drive the photosensitive pixel to perform light sensing.
  • the photosensitive pixels of the next row herein are not limited to one row of photosensitive pixels adjacent to the photosensitive pixels of the current row, and may also be referred to as interlaced photosensitive pixels.
  • the photosensitive device performs light sensing by means of roll sensing, which is read out line by line.
  • time t 11 a first scan driving signal to the sensing pixels in the first row, the first row to drive the photosensitive pixels perform light sensing
  • t 12 time providing a first driving signal to the scan line of the photosensitive pixel 2
  • t 13 time providing a first driving signal to the scanning line 3 of the photosensitive pixel, to drive the third row of pixels perform light sensing photosensitive
  • t 1m time providing a first A scan driving signal is applied to the photosensitive pixels of the mth row to drive the mth row of photosensitive pixels to perform light sensing.
  • an output control signal is supplied to the photosensitive pixels of the row.
  • t 21 time provides an output control signal to the photosensitive pixels of the first row, in order to control the photosensitive signal output line of the first photosensitive pixels
  • t 22 time supplied to the second row of the photosensitive pixel outputs a control signal to control the second row of the photosensitive The photosensitive signal output of the pixel.
  • the time required for the photosensitive device 20 to perform the light sensing is short, and the time for all the photosensitive pixels to wait for reading the photosensitive signal is also the same, that is, the influence of the charge leakage on the photosensitive signal collection is solved, thereby improving the effect. Sensing accuracy.
  • FIG. 14 shows a structure of an electronic device according to an embodiment of the present invention
  • FIG. 15 shows a cross-sectional structure of the electronic device shown in FIG. 14 along line II
  • FIG. 15 shows only Part of the structure of the electronic device.
  • the electronic device includes the photosensitive device of any of the above embodiments, which is used for image display of an electronic device and for sensing biometric information of a target object contacting or approaching the electronic device.
  • Electronic devices such as, but not limited to, suitable types of electronic products such as consumer electronics, home electronics, vehicle-mounted electronic products, and financial terminal products.
  • consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines.
  • Home-based electronic products such as smart door locks, TVs, refrigerators, wearable devices, etc.
  • Vehicle-mounted electronic products such as car navigation systems, car DVDs, etc.
  • Financial terminal products such as ATM machines, terminals for self-service business, etc.
  • the electronic device shown in FIG. 14 is exemplified by a mobile terminal of the mobile phone type.
  • the above-described bio-sensing module can also be applied to other suitable electronic products, and is not limited to mobile terminals.
  • a display device (not shown) is disposed on the front surface of the mobile terminal 3, and the display device includes a display panel 300.
  • the protective cover 400 is disposed above the display panel 300.
  • the screen of the display panel 300 is relatively high, for example, 80% or more.
  • the screen ratio refers to the ratio of the display area 305 of the display panel 300 to the front area of the mobile terminal 3.
  • the photosensitive panel 200 is a panel structure that is adapted to the display panel 300 and is disposed below the display panel 300 . If the display panel 300 is in the form of a flexible curved surface, the photosensitive panel 200 is also in the form of a flexible curved surface. Therefore, the photosensitive panel 200 not only has a planar structure but also a curved surface structure. In this way, the lamination of the photosensitive panel 200 and the display panel 300 is facilitated.
  • the display panel 300 Since the photosensitive panel 200 is located below the display panel 300, the display panel 300 has a light-transmitting region through which an optical signal reflected from the target object passes, so that the photosensitive panel 200 can receive the optical signal passing through the display panel 300 and receive The incoming optical signal is converted into an electrical signal, and predetermined biometric information of the target object contacting or approaching the electronic device is acquired according to the converted electrical signal.
  • the electronic device utilizes the optical signal emitted by the display panel 300 to realize the biometric information sensing of the target object, without additionally providing a light source. Not only does the cost of the electronic device be saved, but biometric information sensing of the target object in the display area 305 of the touch or touch display panel 300 is also achieved.
  • the photosensitive device 20 can be independently fabricated, and then assembled with an electronic device, thereby accelerating the preparation of the electronic device.
  • the display panel 300 emits an optical signal.
  • the photosensitive device 20 receives the optical signal reflected by the object, converts the received optical signal into a corresponding electrical signal, and acquires predetermined biometric information of the object according to the electrical signal. For example, fingerprint image information.
  • the photosensitive device 20 can realize sensing of a target object that contacts or approaches an arbitrary position of the display area.
  • the display panel 300 is, for example but not limited to, an OLED display device, as long as a display device capable of realizing a display effect and having a light-transmitting region through which an optical signal passes is within the scope of the present invention.
  • the display panel 300 can be a bottom emission structure, a top emission structure, and a double-sided light transmission structure.
  • the display screen can be a rigid screen of a rigid material or a flexible screen of a flexible material.
  • the photosensitive panel 200 is configured to perform biometric information sensing of a target object at any position within the display area of the display panel 300.
  • the display panel 300 has a display area 305 and a non-display area 306 defined by the light-emitting areas of all the display pixels 32 of the display panel 300.
  • the area other than the display area 305 is a non-display area 306 for setting a circuit such as a display driving circuit for driving the display pixels 32 or a line bonding area for connecting the flexible circuit boards.
  • the photosensitive panel 200 has a sensing area 203 and a non-sensing area 204 defined by the sensing areas of all the photosensitive pixels 22 of the photosensitive panel 200, and the area other than the sensing area 203 is the non-sensing area 204.
  • the non-sensing area 204 is for setting a circuit such as the photosensitive driving unit 24 that drives the photosensitive pixel 22 to perform light sensing or a line bonding area for connecting the flexible circuit board.
  • the shape of the sensing region 203 is consistent with the shape of the display region 305, and the size of the sensing region 203 is greater than or equal to the size of the display region 305, such that the photosensitive panel 200 can be placed at any position adjacent to or adjacent to the display region 305 of the display panel 300. Sensing of predetermined biometric information of the target object. Further, the area of the photosensitive panel 200 is less than or equal to the area of the display panel 300, and the shape of the photosensitive panel 200 is consistent with the shape of the display panel 300, so that the assembly of the photosensitive panel 200 and the display panel 300 is facilitated. However, in some embodiments, the area of the photosensitive panel 200 may also be larger than the area of the display panel 300.
  • the sensing area 203 of the photosensitive panel 200 may also be smaller than the display area 305 of the display panel 300 to achieve the sense of predetermined biometric information of the target object of the display area 300 displaying the local area of the area 305. Measurement.
  • the display device is further configured to perform touch sensing, and after the display device detects the touch or proximity of the target object, the control display panel emits light corresponding to the position of the touch region.
  • FIG. 17 shows the structure of an electronic device according to an embodiment of the present invention
  • FIG. 18 shows the electronic device along the line of FIG. The cross-sectional structure of the II-II line
  • FIG. 18 shows only a partial structure of the electronic device.
  • the photosensitive module of the embodiment of the present invention is applied to a mobile terminal 3, and a display panel 300 is disposed on the front surface of the mobile terminal, and a protective cover 400 is disposed above the display panel 300.
  • the screen of the display panel 300 is relatively high, for example, 80% or more.
  • the screen ratio refers to the ratio of the actual display area 305 of the display panel 300 to the front area of the mobile terminal.
  • a bio-sensing area S for the target object to touch is provided at a mid-lower position of the actual display area 305 of the display panel 300 to perform biometric information sensing of the target object, for example, the target object is a finger, and the bio-sensing area is S is a fingerprint recognition area for fingerprint recognition.
  • a photosensitive device 20 is disposed at a position corresponding to the fingerprint recognition area S below the display panel 300, and the photosensitive device 20 is configured to acquire a fingerprint image of the finger when the finger is placed on the fingerprint recognition area S.
  • the middle and lower positions of the display panel 300 are for the convenience of the finger to touch the position of the display panel 300 when the user holds the mobile terminal. Of course, it can also be placed at other locations that are convenient for finger touch.
  • the electronic device further includes a touch sensor (not shown) by which the touch area of the target object on the protective cover 400 can be determined.
  • the touch sensor adopts capacitive touch sensing technology, and of course, other methods, such as resistive touch sensing, pressure sensitive touch sensing, and the like.
  • the touch sensor is configured to determine a touch area of the target object when a target object contacts the protective cover 400 to drive a display pixel corresponding to the touch area to light and the photosensitive pixel to perform light sensing.
  • the touch sensor is either integrated with the protective cover 400, or integrated with the photosensitive panel 200, or integrated with the display panel 300.
  • the integrated touch sensor not only realizes the touch detection of the target object, but also reduces the thickness of the electronic device, which is beneficial to the development of the electronic device in the direction of thinning and thinning.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

L'invention concerne un procédé de détection de lumière pour un dispositif photosensible. Le dispositif photosensible (20) comprend de multiples pixels photosensibles (22). Le procédé de détection de lumière consiste à : fournir séquentiellement un signal d'attaque de balayage aux multiples pixels photosensibles (22) de façon à permettre aux pixels photosensibles (22) d'exécuter une détection de lumière lorsqu'un premier temps prédéfini est atteint; lorsque les pixels photosensibles (22) commencent à exécuter une détection de lumière, fournir un signal de commande de sortie aux multiples pixels photosensibles (22) et commander la sortie d'un signal électrique produit par les pixels photosensibles (22) lors de l'exécution d'une détection de lumière.
PCT/CN2017/120404 2017-12-30 2017-12-30 Procédé de détection de lumière pour dispositif photosensible Ceased WO2019127576A1 (fr)

Priority Applications (2)

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PCT/CN2017/120404 WO2019127576A1 (fr) 2017-12-30 2017-12-30 Procédé de détection de lumière pour dispositif photosensible
CN201780002288.8A CN108140121A (zh) 2017-12-30 2017-12-30 感光装置的光感测方法

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PCT/CN2017/120404 WO2019127576A1 (fr) 2017-12-30 2017-12-30 Procédé de détection de lumière pour dispositif photosensible

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CN209044568U (zh) * 2017-12-30 2019-06-28 深圳信炜科技有限公司 感光驱动电路、感光装置及电子设备
CN110008860B (zh) * 2019-03-21 2021-09-24 武汉华星光电技术有限公司 指纹识别架构及触控面板
US11055508B2 (en) 2019-08-29 2021-07-06 Himax Technologies Limited Display panel applicable to reducing noise coupling and enhancing sensing signal in optical fingerprint sensor thereof with aid of switch arrangement, and associated electronic device
CN113536852B (zh) * 2020-04-20 2024-08-02 群创光电股份有限公司 驱动多个感测像素的方法及感测装置
CN111785231A (zh) * 2020-07-09 2020-10-16 深圳市华星光电半导体显示技术有限公司 光感驱动电路及其驱动方法，显示面板及显示装置
CN114170990B (zh) * 2021-12-06 2022-12-13 武汉天马微电子有限公司 显示面板及其环境光检测驱动方法、显示装置

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KR101376228B1 (ko) * 2013-07-17 2014-04-01 실리콘 디스플레이 (주) 광학식 및 정전용량방식으로 지문인식이 가능한 지문인식센서
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