Display panel, sensing identification method and display device

Abstract

The application discloses a display panel, an induction identification method and a display device. The display panel comprises a plurality of pixel circuit units and an induction function module. The induction function module comprises a plurality of control lines, and each control line is connected with at least part of the pixel circuit units in the same column. The pixel circuit unit comprises a photoelectric induction unit. The control end of the photoelectric induction unit is connected with the scanning signal line of the corresponding row of pixel circuit units, and the output end is connected with the control line of the corresponding column. The photoelectric induction unit outputs a corresponding induction signal according to the received reflected light signal. The induction function module is used for receiving the induction signals output by the photoelectric induction units through the control lines. According to the embodiment of the application, the thickness of the display panel can be reduced, the light transmittance of the pixel circuit unit does not need to be improved, and the area of the pixel circuit unit can be reduced by adjusting the arrangement design, so that the pixel circuit layout density of the display panel is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a display panel, an induction recognition method and a display device. BACKGROUND

[0002] Currently, in an AMOLED (Active-matrix organic light-emitting diode) display panel, the solution of the induction recognition function is usually arranged on the back of the screen body, which increases the thickness of the display panel. In order to make the light reflected by the human finger be able to pass through the pixel circuit unit and be received by the induction unit, the pixel circuit unit needs to maintain a certain light transmittance, so that the pixel circuit unit cannot be designed in a close arrangement to reduce the area. SUMMARY

[0003] The display panel, the induction recognition method and the display device provided by the embodiments of the present application can solve the technical problems that the fingerprint recognition device increases the thickness of the display panel and the pixel circuit unit cannot be reduced by arrangement design due to maintaining light transmittance.

[0004] In a first aspect, the embodiments of the present application provide a display panel, which comprises:

[0005] a plurality of pixel circuit units;

[0006] an induction function module, the induction function module comprising a plurality of control lines, each control line being connected with at least part of the pixel circuit units in the same column;

[0007] The pixel circuit unit comprises:

[0008] a photoelectric induction unit, a control end of the photoelectric induction unit being connected with a scan signal line of the pixel circuit unit in the corresponding row, and an output end of the photoelectric induction unit being connected with a control line in the corresponding column;

[0009] The photoelectric induction unit outputs a corresponding induction signal according to the received reflected light signal; and the induction function module is configured to receive the induction signal output by each photoelectric induction unit through each control line, and generate a fingerprint of a human finger according to the induction signal to perform fingerprint recognition.

[0010] In some embodiments, the photoelectric induction unit comprises:

[0011] a photoelectric induction transistor, a gate of the photoelectric induction transistor being connected with a scan signal line of the pixel circuit unit in the corresponding row, a first end of the photoelectric induction transistor being connected with a power signal line, and a second end of the photoelectric induction transistor being connected with a control line in the corresponding column;

[0012] The photoelectric sensing transistor is used to generate corresponding photo-generated carriers according to the light intensity of the reflected light signal of the human finger, generate a sensing signal according to the photo-generated carriers, and output the sensing signal to the control line.

[0013] In some embodiments, the photoelectric sensing unit further comprises:

[0014] The reset transistor has a first end connected to an initialization signal, a gate connected to a reset signal line of a corresponding row, and a second end connected to a control line of a corresponding column.

[0015] In some embodiments, the scan signal line is multiplexed as a reset signal line of a next row.

[0016] In some embodiments, the photoelectric sensing transistor is used to turn on when receiving the scan signal, so as to convert the power supply signal into a sensing signal according to the reflected light signal of the human finger and output the sensing signal to the control line.

[0017] Alternatively, the photoelectric sensing transistor is used to turn off when receiving the scan signal, so as to convert the leakage current into a sensing signal according to the reflected light signal of the human finger and output the sensing signal to the control line.

[0018] In some embodiments, the pixel circuit unit further comprises a data write transistor for controlling the writing of the data signal.

[0019] The data write transistor and the photoelectric sensing transistor are both P-type transistors or N-type transistors.

[0020] Alternatively, one of the data write transistor and the photoelectric sensing transistor is a P-type transistor, and the other is an N-type transistor.

[0021] Preferably, the reset transistor and the data write transistor are of the same type of transistor.

[0022] In some embodiments, the photoelectric sensing transistor is a bottom-gate transistor.

[0023] In a second aspect, the embodiments of the present application provide an induction recognition method, applied to the display panel as above, and the induction recognition method comprises:

[0024] The scan signal is sent to the photoelectric sensing unit through the scan signal line, so that the photoelectric sensing unit generates a sensing signal according to the reflected light signal of the human finger;

[0025] The sensing signal transmitted by the photoelectric sensing unit through the control line is received.

[0026] The fingerprint of the human finger is calculated and generated according to the sensing signal, so as to perform fingerprint recognition according to the fingerprint.

[0027] In some embodiments, before sending the scanning signal through the scanning signal line, further comprising:

[0028] Sending the reset signal to the reset transistor through the reset signal line, so as to reset the control line through the initialization signal.

[0029] In a third aspect, the embodiments of the present application provide a display device, which comprises the display panel as above.

[0030] Compared with the prior art, the display panel provided by the embodiments of the present application can directly receive the light reflected by the human finger through the photoelectric sensing unit, and output the corresponding sensing signal by identifying the light intensity of the reflected light signal. After receiving the sensing signal output by each photoelectric sensing unit on each pixel circuit unit, the sensing function module can determine the touch position on the screen position corresponding to each photoelectric sensing unit, and realize the sensing and identification function according to the touch sensing position. By arranging the photoelectric sensing unit on the pixel circuit unit, the sensing and identification function can be realized, thereby reducing the thickness of the display panel. The photoelectric sensing unit is directly arranged on the pixel circuit unit, and the light reflected by the human finger does not need to pass through the pixel circuit unit, so it is not necessary to improve the light transmittance of the pixel circuit unit, and the area of the pixel circuit unit can be reduced through arrangement design, so as to improve the pixel circuit layout density of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a structural schematic diagram of the display panel provided by an embodiment of the present application;

[0033] Figure 2 is a circuit structural schematic diagram of the pixel circuit unit in an embodiment of the present application;

[0034] Figure 3 is a schematic diagram of the light reflected by the human finger in an embodiment of the present application;

[0035] Figure 4 is a signal schematic diagram of the sensing signal when the light is reflected by the human finger in an embodiment of the present application;

[0036] Figure 5 is a flow schematic diagram of the sensing and identification method in an embodiment of the present application;

[0037] Figure 6is a structural schematic diagram of a display device provided by an embodiment of the present application.

[0038] In the drawings:

[0039] 10, pixel circuit unit; 20, control line; 30, scanning signal line; 40, sensing function module; 11, photoelectric sensing unit; 12, packaging layer; 13, light emitting element layer; 14, driving element layer; M8, photoelectric sensing transistor; M9, reset transistor. DETAILED DESCRIPTION

[0040] The features and exemplary embodiments of various aspects of the present application will be described below in detail, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0041] It should be noted that in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below in combination with the drawings.

[0043] Currently, the inductive recognition solution in the display panel is usually to externally mount an inductive unit under the screen body. However, the inductive unit is usually arranged on the back of the screen body, and the arrangement area is fixed, so the human finger needs to be in the fixed area to perform inductive recognition. Moreover, since the inductive unit is usually arranged below the pixel circuit unit, after the light is reflected by the human finger, it still needs to penetrate the pixel circuit unit to reach the inductive unit. Therefore, in order to enable the inductive unit to receive the light reflected by the human finger, it is necessary to ensure that the pixel circuit unit has a certain light transmittance, so that the light can pass through the pixel circuit unit. When the light transmittance of the pixel circuit unit cannot be reduced, the area of the pixel circuit unit also cannot be reduced, so that the pixel density of the display panel also cannot be further improved.

[0044] To solve the above technical problems, the embodiments of the present application provide a display panel, an inductive recognition method and a display device. First, the display panel provided by the embodiments of the present application is introduced.

[0045] Figure 1 The structure schematic diagram of the display panel provided by an embodiment of the present application is shown. The display panel includes a plurality of pixel circuit units 10 and an inductive function module 40. The plurality of pixel circuit units 10 can be arranged in an array, and the inductive function module 40 includes a plurality of control lines 20, and each control line 20 is connected with at least part of the pixel circuit units 10 in the same column. That is, the number of control lines 20 is the same as the number of columns of pixel circuit units 10.

[0046] The pixel circuit unit 10 includes a photoelectric inductive unit 11. It can be understood that the pixel circuit unit 10 is also connected with a light emitting element and includes various devices capable of driving the light emitting element to emit light, such as transistors and capacitors. Figure 2 In one pixel circuit unit 10 shown, a 7T1C pixel circuit composed of 7 TFTs (Thin Film Transistor) and 1 capacitor and a light emitting element can be included, where M1-M7 are 7 TFTs, Cst is a capacitor, and OLED is a light emitting element. Through the pixel circuit, corresponding scanning signals, light emitting driving signals and data signals, etc. can be received to drive the light emitting element to emit light. The specific principle of driving the light emitting element to emit light by the pixel circuit is not described here.

[0047] The control end of the photoelectric sensing unit 11 is connected with the scanning signal line 30 corresponding to the pixel circuit unit 10 row where the photoelectric sensing unit 11 is located, and the output end of the photoelectric sensing unit 11 is connected with the control line 20 corresponding to the pixel circuit unit 10 column where the photoelectric sensing unit 11 is located. It can be understood that one scanning signal line 30 can be connected with multiple photoelectric sensing units 11 in multiple pixel circuit units 10 in the same row, and simultaneously control multiple photoelectric sensing units 11 in the same row through the output scanning signal.

[0048] The photoelectric sensing unit 11 can output the corresponding voltage signal when receiving the scanning signal output by the scanning signal line 30. When the human finger covers the screen and reflects the light emitted by the display panel, the photoelectric sensing unit 11 can receive the reflected light of the human finger and adjust the output voltage signal according to the light intensity of the reflected light signal to output the corresponding sensing signal Vf.

[0049] It can be understood that since the scanning signal line 30 is connected with multiple photoelectric sensing units 11 in the same row, multiple photoelectric sensing units 11 in the same row can respectively receive the reflected light of the human finger and output the same or different sensing signals Vf according to the light intensity of the reflected light signal.

[0050] The multiple photoelectric sensing units 11 in the same row are respectively connected with the sensing function module 40 through the one-to-one corresponding multiple control lines 20, and when the multiple photoelectric sensing units 11 in the same row output the corresponding sensing signals Vf, the sensing function module 40 can receive these sensing signals Vf through each control line 20.

[0051] The scanning signal line 30 can output the scanning signal in a row-by-row manner, and after the multiple photoelectric sensing units 11 in the previous row receive the scanning signal and respectively output the corresponding sensing signals Vf, the scanning signal line 30 can output the scanning signal to the multiple photoelectric sensing units 11 in the next row, so that the multiple photoelectric sensing units 11 in the next row respectively output the corresponding sensing signals Vf when receiving the scanning signal. The sensing function module 40 can also receive the sensing signals Vf output by the multiple photoelectric sensing units 11 in the next row through each control line 20. After the scanning signal line 30 sends the scanning signal to all rows in a row-by-row manner, the sensing function module 40 receives the sensing signals Vf sent by the photoelectric sensing units 11 on each row in turn, thereby receiving the sensing signals Vf sent by each photoelectric sensing unit 11 on the display panel.

[0052] The sensing function module 40 can recognize whether the screen position corresponding to each photoelectric sensing unit 11 is covered by a human finger according to the sensing signal Vf sent by each photoelectric sensing unit 11, and determine whether the fingerprint data corresponding to the screen position is a fingerprint valley or a fingerprint ridge when the screen position is covered by a human finger according to the signal size of the sensing signal Vf. According to the received sensing signal Vf, the fingerprint valley and the fingerprint ridge of each screen position can be sorted and analyzed, so as to integrate the fingerprint of the human finger covered on the screen, and perform fingerprint recognition according to the fingerprint.

[0053] It can be understood that the sensing function module 40 can also recognize whether the screen position corresponding to each photoelectric sensing unit 11 is covered by a human finger according to the sensing signal Vf sent by each photoelectric sensing unit 11. By recognizing the covered position of the human finger and the information such as the movement and the stay time of the covered position, the touch operation recognition can be realized when the user performs clicking, long pressing, sliding and other operations by the human finger. That is, the sensing function module 40 can not only recognize the touch operation according to the sensing signal Vf, but also recognize the fingerprint according to the sensing signal Vf by receiving the sensing signal Vf sent by each photoelectric sensing unit 11.

[0054] In the embodiment, the photoelectric sensing unit 11 is arranged in the pixel circuit unit 10 arranged in an array on the display panel, so that the corresponding sensing signal Vf can be output according to the light intensity of the received reflected light signal when the human finger covers the screen and reflects the light emitted by the light emitting element in the display panel. The plurality of control lines 20 are connected with the photoelectric sensing units 11 in the pixel circuit units on the same column, so that the sensing function module 40 connected with the plurality of control lines 20 can receive the sensing signal Vf output by the photoelectric sensing unit 11 through the control line 20. After receiving each sensing signal Vf, the sensing function module 40 can determine the corresponding fingerprint valley or fingerprint ridge according to the sensing signal Vf, and determine the corresponding photoelectric sensing unit 11 according to the sensing signal Vf. According to the position of the pixel circuit unit 10 to which each photoelectric sensing unit 11 belongs in the display panel, the fingerprint ridge or fingerprint valley corresponding to each position on the screen can be sorted, so that the fingerprint data of the human finger can be integrated, and the fingerprint recognition can be performed according to the fingerprint data. By arranging the photoelectric sensing unit 11 on the pixel circuit unit 10, the fingerprint recognition of the human finger can be realized, and the thickness of the display panel and the material cost of the fingerprint recognition device can be reduced. At the same time, the photoelectric sensing unit 11 is directly arranged on the pixel circuit unit 10, so that the light reflected by the human finger does not need to penetrate the pixel circuit unit 10, and the light transmittance of the pixel circuit unit 10 does not need to be improved. Moreover, the area of the pixel circuit unit 10 can be reduced by adjusting the arrangement design, so as to improve the pixel circuit layout density of the display panel.

[0055] It can be understood that, in some embodiments, all pixel circuit units 10 on the display panel can be provided with photoelectric sensing units 11, and each column of control lines 20 is only electrically connected with photoelectric sensing units 11 in a part of pixel circuit units 10 in the same column, so that the photoelectric sensing units 11 electrically connected with the control lines 20 can transmit the sensing signals. The corresponding area of the photoelectric sensing units 11 electrically connected with the control lines 20 on the display panel is the area capable of realizing fingerprint identification. The photoelectric sensing units 11 are arranged in all pixel circuit units 10 on the display panel, which can keep the structure of all pixel circuit units 10 on the display panel consistent and reduce the wiring design difficulty of the display panel.

[0056] In some embodiments, the photoelectric sensing units 11 can also be arranged in only a part of pixel circuit units 10 on the display panel, so that the user can realize fingerprint identification in the display area provided with the photoelectric sensing units 11. By collecting the fingerprint identification habits of the user, the fingerprint identification area most frequently used by the user can be determined from each area of the display panel, and the photoelectric sensing units 11 are arranged in the pixel circuit units 10 in the fingerprint identification area, which can meet the fingerprint identification demand of the user, and also reduce the number of photoelectric sensing units 11 to reduce the production cost of the display panel.

[0057] Please refer to Figure 3 , the encapsulation layer 12, the light emitting element layer 13 and the driving element layer 14 are arranged along the direction close to the display panel substrate. When the display panel drives the light emitting element layer 13 to emit light, the light is reflected by the fingerprint valleys or fingerprint ridges of the human finger, and the reflected light signal passes through the encapsulation layer 12 and the light emitting element layer 13 to reach the driving element layer 14. The photoelectric sensing unit 11 is arranged on the driving element layer 14, which can receive the reflected light signal and output a corresponding sensing signal Vf according to the light intensity of the reflected light signal.

[0058] As an optional embodiment, please refer to Figure 2 , the above-mentioned photoelectric sensing unit 11 can include a photoelectric sensing transistor M8, the gate of the photoelectric sensing transistor M8 is connected with the scanning signal line 30 of the corresponding row, the first end of the photoelectric sensing transistor M8 is connected with the power signal line, and the second end of the photoelectric sensing transistor M8 is connected with the control line 20 of the corresponding column.

[0059] The photoelectric sensing transistor M8 can be turned on when the gate receives the scanning signal output by the scanning signal line 30. When the photoelectric sensing transistor M8 is turned on, the power signal VDD output by the power signal line can be transmitted to the sensing function module 40 through the photoelectric sensing transistor M8 and the control line 20. At this time, the signal voltage received by the sensing function module 40 is the power signal VDD. When the photoelectric sensing transistor M8 receives the reflected light signal reflected by the human finger, the semiconductor layer on the photoelectric sensing transistor M8 can receive the reflected light signal and generate corresponding photo-generated carriers, thereby increasing the current flowing through the photoelectric sensing transistor M8. At this time, the power signal VDD can generate a corresponding sensing signal Vf after the current is increased by the photo-generated carriers, and output to the control line 20, so that the sensing function module 40 receives the sensing signal Vf.

[0060] Since the photoelectric sensing transistor M8 increases the current flowing through the photoelectric sensing transistor M8 after receiving the reflected light signal to generate photo-generated carriers, the sensing signal Vf formed after the power signal VDD passes through the photoelectric sensing transistor M8 increases compared to the signal voltage of the power signal VDD. That is, the photoelectric sensing transistor M8 generates photo-generated carriers after the power signal VDD is boosted to obtain the sensing signal Vf.

[0061] It can be understood that the sensing function module 40 can further determine whether the corresponding position of the photoelectric sensing transistor M8 is a fingerprint ridge or a fingerprint valley according to the signal voltage of the sensing signal Vf. As shown in Figure 3 When the position of the human finger corresponding to the photoelectric sensing transistor M8 is a fingerprint ridge, the light signal reflected by the fingerprint ridge is reflected in all directions, so that the reflected light signal received by the photoelectric sensing transistor M8 corresponding to the fingerprint ridge is small. When the position of the human finger corresponding to the photoelectric sensing transistor M8 is a fingerprint valley, most of the light signal reflected by the fingerprint valley is reflected in the original light emitting direction, so that the reflected light signal received by the photoelectric sensing transistor M8 corresponding to the fingerprint valley is large. That is, the voltage increment of the sensing signal Vf generated by the photoelectric sensing transistor M8 at the position corresponding to the fingerprint ridge is small relative to the power signal VDD, and the voltage increment of the sensing signal Vf generated by the photoelectric sensing transistor M8 at the position corresponding to the fingerprint valley is large relative to the power signal VDD. The sensing function module 40 can determine whether the corresponding position of each photoelectric sensing transistor M8 is a fingerprint ridge or a fingerprint valley according to the signal voltage of the sensing signal Vf.

[0062] As an optional embodiment, please continue to refer to Figure 2The photoelectric sensing unit 11 can further include a reset transistor M9, a first end of the reset transistor M9 is connected with the initialization signal Vref, a second end of the reset transistor M9 is connected with the control line 20 of the corresponding column, and a gate of the reset transistor M9 is connected with the reset signal line of the corresponding row.

[0063] The reset signal line can send a reset signal to the reset transistor M9 of the same row, and the reset transistor M9 is turned on when receiving the reset signal to connect the initialization signal Vref to the control line 20 of the corresponding column. Before sending the corresponding sensing signal Vf through the control line 20, the control line 20 is reset, which can avoid the influence of residual charges on the control line 20 on the sensing signal Vf, and improve the fingerprint recognition accuracy of the sensing function module 40. At the same time, by resetting the control line 20, the recombination speed of the photo-generated carriers can also be accelerated.

[0064] As an optional embodiment, each photoelectric sensing unit 11 can include a non-fingerprint identification stage and a fingerprint identification stage when transmitting the sensing signal Vf.

[0065] In the non-fingerprint identification stage, the reset signal line outputs a reset signal, and the reset transistor M9 is turned on when receiving the reset signal to connect the initialization signal Vref to the control line 20 of the corresponding column.

[0066] In the fingerprint identification stage, the scan signal line 30 outputs a scan signal, and the photoelectric sensing transistor M8 is turned on when receiving the scan signal. One end of the photoelectric sensing transistor M8 can generate corresponding photo-generated carriers according to the reflected light signal reflected by the human finger when receiving the power signal VDD output by the power signal line, to generate a corresponding sensing signal Vf after boosting the signal voltage of the power signal VDD, and send it to the sensing function module 40 through the control line 20 of the corresponding column.

[0067] It can be understood that before the scan signal line 30 of each row sends a scan signal to the photoelectric sensing transistor M8 in the photoelectric sensing unit 11 of the row, the reset signal line can send a reset signal to the reset transistor M9 in the photoelectric sensing unit 11 of the row, so that each control line 20 is reset by the initialization signal Vref, and then the photoelectric sensing transistor M8 is controlled to be turned on by the scan signal to send the sensing signal Vf through each control line 20. That is, each reset signal line can be connected with the reset transistor M9 of the same row, and the reset signal line can also be output in a row-by-row driving manner to reset the corresponding control line 20 through the reset transistor M9 before the photoelectric sensing transistor M8 of each row is turned on.

[0068] As an optional embodiment, each scan signal line in the plurality of scan signal lines can be multiplexed as a reset signal line of the next row.

[0069] Before the photoelectric sensing transistor M8 in the same row of the photoelectric sensing unit 11 outputs the sensing signal Vf through the control line 20, the control line 20 needs to be reset by introducing the initialization signal Vref, that is, the reset transistor M9 in the photoelectric sensing unit 11 receives the reset signal first, and the photoelectric sensing transistor M8 receives the scanning signal later. Since the scanning signal line outputs the scanning signal row by row, when each scanning signal line is multiplexed as the reset signal line of the next row, the reset signal can be output to the next row at the same time as the scanning signal is output to the current row, so that the next row resets the control line 20 according to the reset signal.

[0070] It can be understood that, in order to avoid the photoelectric sensing transistor M8 of the previous row outputting the sensing signal Vf at the same time as the reset transistor M9 of the next row resetting the control line 20, a delay unit can be arranged between the gate of each reset transistor M9 and the reset signal line, or the parameters such as the wire width and the wire length of the wire part of the reset signal line extending from the scanning signal line of the previous row are set, so that the reset transistor M9 can receive the reset signal after a certain time delay, avoiding the simultaneous operation of the photoelectric sensing transistor M8 of the previous row and the reset transistor M9 of the next row, which causes the sensing function module 40 to fail to receive the sensing signal Vf.

[0071] Please refer to Figure 2 , S1, S2 and S3 are reset signal, scanning signal and light-emitting initialization signal respectively. Among them, S2 can be used as scanning signal or scanning signal.

[0072] When the S1 signal is enabled, the reset transistor M9 and the first initialization transistor M4 initialize the sensing signal line 20 and the gate of the driving transistor M1 respectively.

[0073] When the S2 signal is enabled, the data writing transistor M2, the compensation transistor M3 and the photoelectric sensing transistor M8 are turned on, so that the data signal is written into the driving transistor M1 at the same time as the photoelectric sensing transistor is turned on, and the photoelectric sensing transistor outputs the corresponding sensing signal Vf to the control line 20 according to the light intensity of the received reflected light signal.

[0074] When the S3 signal is enabled, the second initialization transistor is turned on to initialize the anode of the light-emitting element.

[0075] It can be understood that the above-mentioned S1, S2 and S3 signals can control multiple transistors by multiplexing, or separate signal wires can be provided for each transistor to transmit corresponding signals. For example, the S2 signal can be split into three separate signal wires to control the reset transistor M9, the first initialization transistor M4 and the driving transistor M1 respectively. In order to adapt to P-type or N-type transistors, each signal wire can also invert the signal to adapt to the corresponding transistor.

[0076] As an optional embodiment, the photoelectric sensing transistor M8 can be configured to be turned on when receiving the active signal of the scanning signal, or configured to be turned off when receiving the active signal of the scanning signal.

[0077] It can be understood that the scanning signal line 30 connected with the pixel circuit unit 10 usually outputs low-level active signal line by line. That is, when the scanning signal line 30 outputs low-level signal, the data writing transistor M2 is turned on to write the data signal into the driving transistor M1.

[0078] When the photoelectric sensing transistor M8 receives the active signal of the scanning signal and is turned on, the photoelectric sensing transistor M8 can generate photo-generated carriers according to the received reflected light signal and boost the received power signal VDD to obtain the sensing signal Vf. At this time, if the sensing function module 40 receives the sensing signal Vf output by a certain photoelectric sensing transistor M8 which is the same as the power signal VDD, it can be determined that the photoelectric sensing transistor M8 does not receive the reflected light signal; if the sensing signal Vf output by a certain photoelectric sensing transistor M8 is greater than the power signal VDD, the corresponding fingerprint ridge or fingerprint valley can be determined according to the signal voltage of the sensing signal Vf. That is, at this time, the photoelectric sensing transistor M8 boosts the power signal VDD according to the photo-generated carriers to obtain the sensing signal Vf which is greater than or equal to the power signal VDD.

[0079] When the photoelectric sensing transistor M8 receives the active signal of the scanning signal and is turned off, the sensing signal Vf output by the control line 20 is the leakage current signal in the off state. When the photoelectric sensing transistor M8 receives the reflected light signal, the generated leakage current increases, so that the sensing signal Vf at this time increases compared with the sensing signal Vf when no reflected light signal is received. Then, if the sensing function module 40 receives the sensing signal Vf which is greater than the normal leakage current signal, it can be determined that the photoelectric sensing transistor M8 receives the reflected light signal, and the corresponding fingerprint ridge or fingerprint valley of the photoelectric sensing transistor M8 can be determined according to the signal difference between the signal voltage of the sensing signal Vf and the leakage current signal of the photoelectric sensing transistor M8 in the off state.

[0080] Since the leakage current generated by the photoelectric induction transistor M8 is small when it is in the off state, when receiving the reflected light signal, the photo-generated carriers generated will cause a small leakage current to increase greatly in amplitude. The induction function module 40 can more accurately determine the light intensity of the reflected light signal according to the large amplitude change of the leakage current, so as to more accurately determine whether the fingerprint data of the corresponding position is a fingerprint valley or a fingerprint ridge. That is, the induction function module 40 can more accurately determine the fingerprint data of the corresponding position by detecting the change amplitude of the leakage current of the photoelectric induction transistor M8 in the off state, thereby improving the sensitivity of fingerprint identification.

[0081] It can be understood that the photoelectric induction transistor M8 described above is turned on when receiving the non-active signal of the scanning signal, and at this time the induction function module 40 receives the power signal VDD. That is, the induction function module 40 can determine that the photoelectric induction transistor M8 is in a non-working state when the received signal voltage is greater than the power signal VDD.

[0082] As an optional embodiment, the pixel circuit unit 10 described above further includes a data writing transistor M2, which is connected with the scanning signal line and the data signal line and can write the data signal into the driving transistor M1 when turned on.

[0083] When the photoelectric induction transistor M2 outputs the induction signal Vf according to the photo-generated carriers, there are several cases:

[0084] When the active signal of the scanning signal is a low-level signal and the photoelectric induction transistor M8 boosts the power signal VDD according to the photo-generated carriers, the data writing transistor M2 is a P-type transistor and the photoelectric induction transistor M8 is also a P-type transistor;

[0085] When the active signal of the scanning signal is a high-level signal and the photoelectric induction transistor M8 boosts the power signal VDD according to the photo-generated carriers, the data writing transistor M2 is an N-type transistor and the photoelectric induction transistor M8 is also an N-type transistor;

[0086] When the active signal of the scanning signal is a low-level signal and the photoelectric induction transistor M8 boosts the leakage current signal according to the photo-generated carriers, the data writing transistor M2 is a P-type transistor and the photoelectric induction transistor M8 is an N-type transistor;

[0087] When the active signal of the scanning signal is a high-level signal and the photoelectric induction transistor M8 boosts the leakage current signal according to the photo-generated carriers, the data writing transistor M2 is an N-type transistor and the photoelectric induction transistor M8 is a P-type transistor.

[0088] As can be seen from the above four cases, when the photoelectric sensing transistor M8 generates the sensing signal Vf by photo-generated carriers on the basis of the power signal VDD, the photoelectric sensing transistor M8 needs to be turned on when receiving the active signal of the scanning signal, at this time, the photoelectric sensing transistor M8 and the data writing transistor M2 are the same type of transistors, for example, they can both be P-type transistors or both be N-type transistors, which are selected according to the active signal of the scanning signal.

[0089] When the photoelectric sensing transistor M8 generates the sensing signal Vf by photo-generated carriers on the basis of the drain current signal, the photoelectric sensing transistor M8 needs to be turned off when receiving the active signal of the scanning signal, at this time, the photoelectric sensing transistor M8 and the data writing transistor M2 are different types of transistors, one is a P-type transistor and the other is an N-type transistor, and the specific selection is also selected according to the active signal of the scanning signal.

[0090] As for the reset transistor M9, since it needs to be turned on when receiving the active signal of the scanning signal, the reset transistor M9 needs to be set to be the same type of transistor as the data writing transistor M2.

[0091] As an optional embodiment, the photoelectric sensing transistor M8 and the data writing transistor M2 are the same type of transistors, and the gate of the photoelectric sensing transistor M8 receives the inverted signal of the scanning signal.

[0092] When the photoelectric sensing transistor M8 and the data writing transistor M2 are the same type of transistors and the received signals are inverted signals of each other, the photoelectric sensing transistor M8 can also be turned off when the data writing transistor M2 is turned on, so that the photoelectric sensing transistor M8 generates the sensing signal Vf by increasing the drain current signal through photo-generated carriers in the off state.

[0093] Please refer to Figure 4 When the scanning signal Scan is a low-level active signal, the data writing transistor M2 and the photoelectric sensing transistor M8 are both P-type transistors, the sensing function module 40 can receive the sensing signal Vf output by the photoelectric sensing unit 11 in the same row through the plurality of control lines 20 when each row of photoelectric sensing units 11 receives the active Scan signal.

[0094] When the screen body is not covered by the human finger, Vf1 is each sensing signal Vf received by the sensing function module 40. That is, when there is no human finger to reflect light, the sensing signal Vf output by each photoelectric sensing unit 11 remains the same.

[0095] When the screen is covered by a human finger, the FP is the covered area of the human finger, and the NFP is the uncovered area of the human finger. In the uncovered area NFP, the output sensing signal Vf remains the same because the photoelectric sensing unit 11 does not receive the reflected light signal. In the covered area FP, when the photoelectric sensing unit 11 receives the reflected light signal of the fingerprint ridge, the signal voltage of the sensing signal Vf generated according to the light intensity of the reflected light signal of the fingerprint ridge is Ri; when the photoelectric sensing unit 11 receives the reflected light signal of the fingerprint valley, the signal voltage of the sensing signal Vf generated according to the light intensity of the reflected light signal of the fingerprint valley is Va. It can be understood that the light intensity of the reflected light signal of different fingerprint ridges is not completely consistent, and thus the sensing signal Vf generated when the photoelectric sensing unit 11 receives the reflected light signal of different fingerprint ridges can remain in a first voltage range. Therefore, when the sensing function module 40 receives the sensing signal Vf in the first voltage range, it can be considered that the received signal voltage corresponds to the fingerprint ridge. Similarly, when the sensing function module receives the sensing signal Vf in a second voltage range, it can be considered that the received signal voltage corresponds to the fingerprint valley.

[0096] It can be understood that the signal voltage Ri is in the first voltage range, and the signal voltage Va is in the second voltage range.

[0097] After the sensing function module 40 sequentially receives the sensing signals Vf output by the photoelectric sensing units 11 in different rows, the area covered by the human finger in each row can be identified, and it can be identified whether the position covered by the human finger is a fingerprint ridge or a fingerprint valley. After the areas covered by the human finger in each row are integrated and processed, the fingerprint data information of the human finger can be obtained, and thus the fingerprint recognition can be performed according to the fingerprint data information.

[0098] As an optional embodiment, the photoelectric sensing transistor M8 can be a bottom-gate transistor. The transistor generally includes a top-gate transistor and a bottom-gate transistor. In the top-gate transistor, the gate is closer to the screen surface than the active layer. In the bottom-gate transistor, the gate is closer to the substrate of the display panel than the active layer.

[0099] It can be understood that the active layer of the photoelectric sensing transistor M8 is generally a semiconductor material with a certain thickness, which can generate corresponding photo-generated carriers according to the light intensity of the reflected light signal when receiving the reflected light signal. If a top-gate transistor is used, part of the reflected light signal will be blocked by the gate, so that the active layer cannot receive the part of the reflected light. In order to enable the active layer to fully receive the reflected light signal, the photoelectric sensing transistor M8 can be set as a bottom-gate transistor.

[0100] In a low temperature poly-silicon (LTPS) transistor, a heavy doping process is needed, in order to avoid the channel position of the transistor from being heavily doped, a metal layer is arranged on the semiconductor layer of the bottom gate transistor to avoid the channel position from being heavily doped. After the heavy doping is completed, the metal layer can be etched.

[0101] The embodiment of the present application further provides a sensing identification method, which can be applied to the display panel in the above embodiment, Figure 5 The structure diagram of the sensing identification method provided by an embodiment of the present application is shown. The sensing identification method comprises:

[0102] S110, sending a scanning signal to the photoelectric sensing unit through a scanning signal line, so that the photoelectric sensing unit generates a sensing signal according to the reflected light signal of the human finger;

[0103] S120, receiving the sensing signal transmitted by the photoelectric sensing unit through a control line;

[0104] S130, performing fingerprint identification and / or touch identification according to the sensing signal.

[0105] In the embodiment, the display panel can send a scanning signal through a scanning signal line to drive the photoelectric sensing unit. When the photoelectric sensing unit receives the reflected light signal of the human finger, the photoelectric sensing unit can generate a corresponding sensing signal according to the light intensity of the reflected light signal, and send the sensing signal to the sensing function module through a control line. The sensing function module can determine the positions of the fingerprint ridges and the fingerprint valleys according to the signal sizes of the sensing signals, thereby integrating the fingerprint data of the user, and performing fingerprint identification according to the fingerprint data.

[0106] In S110, the display panel can send a scanning signal to the photoelectric sensing unit through a scanning signal line, so that the photoelectric sensing unit receives the reflected light signal of the human finger, and generates a corresponding photo-generated carrier according to the light intensity of the reflected light signal, and generates a corresponding sensing signal by boosting the power signal VDD received by the photoelectric sensing unit through the photo-generated carrier.

[0107] In S120, when the photoelectric sensing unit generates a corresponding sensing signal, the photoelectric sensing unit can send the sensing signal to the sensing function module through a control line. When the scanning signal line drives the photoelectric sensing unit row by row, the sensing function module can receive the sensing signals sent by the photoelectric sensing unit row by row through multiple control lines. That is, the sensing function module can receive the sensing signals sent by all photoelectric sensing units in the same row through multiple control lines at the same time when the photoelectric sensing units in the same row send the sensing signals. When the photoelectric sensing units in the next row send the sensing signals, all sensing signals in the next row are also received through multiple control lines at the same time.

[0108] After the scanning signal line sends the scanning signal to all rows of the photoelectric sensing units in turn, the sensing function module can receive the sensing signals sent by all the photoelectric sensing units.

[0109] In S130, the sensing function module can determine, according to each sensing signal, whether the fingerprint data corresponding to the position of the corresponding photoelectric sensing unit is a fingerprint ridge or a fingerprint valley. The fingerprint data of the human finger can be integrated and generated according to the positions of each fingerprint ridge and fingerprint valley, so as to perform fingerprint recognition according to the fingerprint data.

[0110] The sensing function module can also determine, according to each sensing signal, whether the position of the corresponding photoelectric sensing unit is covered by the human finger. By identifying the covered position of the human finger and the movement, stay time and other information of the covered position, the sensing function module can also realize touch operation recognition when the user performs clicking, long pressing, sliding and other operations through the human finger. That is, the sensing function module can receive the sensing signals sent by each photoelectric sensing unit, and can both recognize the touch operation according to the sensing signals and perform fingerprint recognition according to the sensing signals.

[0111] As an optional embodiment, before S110, the above method can further include:

[0112] S210, sending a reset signal to the reset transistor through the reset signal line, so that the control line is reset by the initialization signal.

[0113] In this embodiment, the photoelectric sensing unit includes a photoelectric sensing transistor and a reset transistor. Before sending the scanning signal to the photoelectric sensing transistor in the photoelectric sensing unit, a reset signal can also be sent to the reset transistor through the reset signal line, so that the reset transistor is turned on and the initialization signal is connected to the corresponding control line to reset the control line. By resetting the control line before each output of the sensing signal, the influence of the residual charge generated by the previous sensing signal can be avoided, and the accuracy of each output of the sensing signal can be ensured.

[0114] The application also provides a display device, please see Figure 6 The display device can be a PC, a television, a display, a mobile terminal, a tablet computer, a wearable device, etc. The display device can include the display panel provided by the application.

[0115] The functional blocks shown in the structural block diagrams described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, functional cards, and the like. When implemented in software, the elements of the present application are program or code segments that are used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted by a first data signal carrier wave in a transmission medium or communication link. The "machine-readable medium" can include any medium that can store or transfer information. Examples of the machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, and the like.

[0116] It should be noted that, in this document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0117] The principles and implementation modes of the present application are described by applying specific examples in this document. The above examples are only used to help understand the method of the present application and its core idea. The above is only the preferred implementation mode of the present application. It should be noted that, due to the limited nature of the language expression, there are infinite specific structures in objective world. For ordinary skilled persons in the technical field, they can make several improvements, refinements, or changes without departing from the principles of the present application, or combine the above technical features in an appropriate way. These improvements, refinements, changes, or combinations, or direct application of the ideas and technical solutions of the present application to other occasions without improvements, shall be regarded as the protection scope of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a plurality of pixel circuit units; a sensing function module, the sensing function module comprising a plurality of control lines, each control line being connected to at least part of the pixel circuit units in the same column; the pixel circuit unit comprising: a photoelectric sensing unit, a control end of the photoelectric sensing unit being connected to a scan signal line of the pixel circuit unit in the corresponding row, and an output end of the photoelectric sensing unit being connected to a control line in the corresponding column; the photoelectric sensing unit being configured to output a corresponding sensing signal according to a received reflected light signal; the sensing function module being configured to receive the sensing signal output by each photoelectric sensing unit through each control line; and the photoelectric sensing unit electrically connected to the control line corresponding to a fingerprint recognition area on the display panel; the photoelectric sensing unit comprising: a photoelectric sensing transistor, a gate of the photoelectric sensing transistor being connected to a scan signal line of the pixel circuit unit in the corresponding row, a first end of the photoelectric sensing transistor being connected to a power signal line, and a second end of the photoelectric sensing transistor being connected to a control line in the corresponding column; a reset transistor, a first end of the reset transistor being connected to an initialization signal, a gate of the reset transistor being connected to a reset signal line of the pixel circuit unit in the corresponding row, and a second end of the reset transistor being connected to a control line in the corresponding column; the photoelectric sensing transistor being configured to generate corresponding photo-generated carriers according to the light intensity of the reflected light signal, generate a sensing signal according to the photo-generated carriers, and output the sensing signal to the control line; the pixel circuit unit further comprising a data write transistor for controlling the writing of a data signal, a gate of the data write transistor being electrically connected to a gate of the photoelectric sensing transistor.

2. The display panel of claim 1, wherein, the scan signal line being multiplexed as a reset signal line of the next row.

3. The display panel of claim 1, wherein, the photoelectric sensing transistor being configured to be turned on when receiving a scan signal, so as to convert the power signal into the sensing signal according to the reflected light signal and output the sensing signal to the control line; alternatively, the photoelectric sensing transistor being configured to be turned off when receiving a scan signal, so as to convert a leakage current into the sensing signal according to the reflected light signal and output the sensing signal to the control line.

4. The display panel of claim 3, wherein, the data write transistor and the photoelectric sensing transistor are both P-type transistors or both N-type transistors; alternatively, one of the data write transistor and the photoelectric sensing transistor is a P-type transistor, and the other is an N-type transistor.

5. The display panel of claim 4, wherein, the reset transistor and the data write transistor are of the same type.

6. The display panel of claim 1, wherein, the photoelectric sensing transistor is a bottom-gate transistor.

7. An inductive identification method, characterized by The sensing and identifying method is applied to the display panel of any one of claims 1-6, and the sensing and identifying method comprises: sending a scan signal to the photoelectric sensing unit through the scan signal line, so that the photoelectric sensing unit generates a sensing signal according to a reflected light signal of a human finger; receiving the sensing signal transmitted by the photoelectric sensing unit through the control line; performing fingerprint identification and / or touch identification according to the sensing signal.

8. The inductive identification method of claim 7, wherein, Before the scan signal is sent through the scan signal line, the method further comprises: sending a reset signal to the reset transistor through the reset signal line, so that the control line is reset by the initialization signal.

9. A display device, characterized by The display device includes the display panel of any one of claims 1-6.

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