CN115410503A

CN115410503A - Display panel and display device

Info

Publication number: CN115410503A
Application number: CN202211088161.1A
Authority: CN
Inventors: 李东升; 任庆荣; 邢汝博; 李俊峰
Original assignee: Yungu Guan Technology Co Ltd
Current assignee: Yungu Guan Technology Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2022-11-29

Abstract

The invention discloses a display panel and a display device, wherein the display panel comprises a pixel circuit and a fingerprint detection circuit, wherein the pixel circuit is used for driving a light-emitting device to emit light based on signals provided by a scanning line, a data line, an initialization signal line, a first power supply and a second power supply; the fingerprint detection circuit is used for resetting the photosensitive device based on signals input by the reset signal control end and the reset signal input end and outputting a fingerprint detection signal through the signal output end, wherein the reset signal control end is connected with the reset control signal line or the scanning line, and/or the reset signal input end is connected with the reset signal line or the initialization signal line or the scanning line, and/or the power supply end is connected with the third power supply line or the first power supply or the scanning line, and/or the signal output end is connected with the signal reading line or the data line. The signal line that fingerprint detection circuit connects is multiplexing with the signal line that pixel circuit connects to realize fingerprint detection in the screen, practice thrift the kind and the quantity of signal line, simplify the display panel structure.

Description

Display panel and display device

Technical Field

The invention relates to the technical field of display, in particular to a display panel and a display device.

Background

With the development of science and technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present. The main component of the electronic device that implements the display function is the display panel.

In order to meet the ever-increasing functional requirements of people, electronic equipment generally has a fingerprint detection function. At present, corresponding modules are generally arranged under a screen to realize fingerprint detection. However, with the popularization of flexible curved screens and folding screens, the finger print detection under the screen is difficult to be applied to curved screens and folding screens.

Disclosure of Invention

The invention provides a display panel and a display device, which are used for detecting fingerprints in a screen, saving the types and the number of signal lines and simplifying the structure of the display panel.

According to an aspect of the present invention, there is provided a display panel including: the fingerprint detection circuit comprises a pixel circuit and a fingerprint detection circuit, wherein the pixel circuit comprises a light-emitting device;

the pixel circuit is respectively connected with a scanning line, a data line, an initialization signal line, a first power supply and a second power supply, and is used for driving the light-emitting device to emit light based on signals provided by the scanning line, the data line, the initialization signal line, the first power supply and the second power supply;

the fingerprint detection circuit comprises a reset signal control end, a reset signal input end, a power end, a signal output end and a photosensitive device, and is used for resetting the photosensitive device based on signals input by the reset signal control end and the reset signal input end and outputting a fingerprint detection signal through the signal output end;

wherein the reset signal control end is connected with a reset control signal line or the scanning line,

and/or the reset signal input end is connected with a reset signal line or the initialization signal line or the scanning line,

and/or the power supply end is connected with a third power supply line or the first power supply or the scanning line,

and/or the signal output end is connected with a signal reading line or the data line.

Optionally, the fingerprint detection circuit further includes a reset module and a signal output module, the reset module is configured to reset the photosensitive device and the signal output module based on signals of the reset signal control terminal and the reset signal input terminal, and the signal output module is configured to generate and output the fingerprint detection signal based on the reset signal control terminal, the reset signal input terminal, the signal of the power supply terminal, and a photosensitive state of the photosensitive device;

the pixel circuit further comprises a data writing module, a driving module and an initialization module, wherein the scanning line comprises a first scanning line, a second scanning line and/or a third scanning line, the data writing module is connected with the data line and the first scanning line, the data writing module is used for transmitting data voltage output by the data line to a control end of the driving module, the initialization module is connected with the initialization signal line, the second scanning line and/or the third scanning line, the initialization module is used for initializing a control end of the driving module and/or the light-emitting device, the driving module and the light-emitting device are connected between the first power supply and the second power supply, and the driving module is used for generating driving current according to the data voltage and driving the light-emitting device to emit light.

Optionally, the pixel circuit further includes a light emission control module and a compensation module, the scan line further includes a light emission control signal line and a fourth scan line, the light emission control module is connected to the light emission control signal line, and the light emission control module, the driving module and the light emitting device are connected between the first power supply and the second power supply;

the compensation module is connected with the fourth scanning line, the compensation module is connected between the first end and the control end of the driving module, and the compensation module is used for performing threshold compensation on the driving module based on a signal on the fourth scanning line; optionally, a first end of the photosensitive device is connected to the reset module, and a second end of the photosensitive device is connected to the light-emitting control signal line.

Optionally, the reset module includes a reset transistor, a first pole of the reset transistor is used as the reset signal input end, a second pole of the reset transistor is connected to the signal output module and the photosensitive device, respectively, a gate of the reset transistor is used as the reset signal control end, and a first pole of the reset transistor is connected to the initialization signal line or the first power supply;

optionally, a gate of the reset transistor is connected to the first scan line, the second scan line, the third scan line, the fourth scan line, or the light-emitting control signal line.

Optionally, the reset module includes a reset transistor, a first pole of the reset transistor is used as the reset signal input end, a second pole of the reset transistor is connected to the signal output module and the photosensitive device, respectively, a gate of the reset transistor is used as the reset signal control end, and a first pole of the reset transistor is connected to the light emission control signal line;

optionally, a gate of the reset transistor is connected to the first scan line, the second scan line, the third scan line, or the fourth scan line.

Optionally, a first end of the photosensitive device is connected to the reset module, and a second end of the photosensitive device is connected to the first power supply, the second power supply, or the initialization signal line.

Optionally, the signal output module includes a signal obtaining transistor and an output transistor, a first pole of the signal obtaining transistor is used as the power supply end, a second pole of the signal obtaining transistor is connected to the first pole of the output transistor, a gate of the signal obtaining transistor is connected to the reset module, a gate of the output transistor is connected to the output control signal line or the first scan line or the second scan line or the third scan line, and a second pole of the output transistor is used as the signal output end;

optionally, the first pole of the signal acquisition transistor is connected to the first power supply.

Optionally, the signal output module includes a signal obtaining transistor and an output transistor, a first pole of the signal obtaining transistor is used as the power supply terminal, a second pole of the signal obtaining transistor is connected to the first pole of the output transistor, a gate of the signal obtaining transistor is connected to the reset module, and a gate of the output transistor is connected to the fourth scan line;

optionally, the first electrode of the signal obtaining transistor is connected to the light emission control signal line.

Optionally, the second pole of the output transistor is connected to the data line, and the display panel further includes a time-sharing control circuit, where the time-sharing control circuit is configured to provide a data voltage to the data line and read the fingerprint detection signal in a time-sharing manner based on the first time-sharing control signal and the second time-sharing control signal.

Optionally, the time-sharing control circuit includes: the fingerprint detection circuit comprises a first time-sharing control transistor and a second time-sharing control transistor, wherein a first pole of the first time-sharing control transistor is connected with a second pole of the output transistor, the second pole of the first time-sharing control transistor is connected with a fingerprint driving chip, a grid electrode of the first time-sharing control transistor is connected with a first time-sharing control signal line, and the first time-sharing control signal line is used for providing a first time-sharing control signal;

the first pole of the second time-sharing control transistor is connected with the second pole of the output transistor, the second pole of the second time-sharing control transistor is connected with the display driving chip, the grid electrode of the second time-sharing control transistor is connected with a second time-sharing control signal line, and the second time-sharing control signal line is used for providing the second time-sharing control signal.

According to another aspect of the present invention, there is provided a display device including the display panel of any one of the above.

The display panel provided by the embodiment of the invention comprises a pixel circuit and a fingerprint detection circuit, wherein the pixel circuit comprises a light-emitting device; the pixel circuit is respectively connected with the scanning line, the data line, the initialization signal line, the first power supply and the second power supply, and is used for driving the light-emitting device to emit light based on signals provided by the scanning line, the data line, the initialization signal line, the first power supply and the second power supply; the fingerprint detection circuit comprises a reset signal control end, a reset signal input end, a power supply end, a signal output end and a photosensitive device, and is used for resetting the photosensitive device based on signals input by the reset signal control end and the reset signal input end and outputting a fingerprint detection signal through the signal output end, wherein the reset signal control end is connected with a reset control signal line or a scanning line, and/or the reset signal input end is connected with a reset signal line or an initialization signal line or a scanning line, and/or the power supply end is connected with a third power supply line or a first power supply or a scanning line, and/or the signal output end is connected with a signal reading line or a data line. The signal line that fingerprint detection circuit connects is multiplexed with the signal line that pixel circuit connects, and then realizes when drive display panel shows, realizes fingerprint detection's function simultaneously, because of the multiplexing of signal line, can practice thrift the quantity of signal line, simplifies display panel's structure. And fingerprint detection circuit and pixel circuit all set up the display area at display panel, and then realize the function that fingerprint detected in the screen, and display panel is applicable in curved surface screen and folding screen, and the suitability is stronger.

It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another display panel provided in the embodiment of the present invention;

FIG. 5 is a timing diagram of a driving process of a display panel according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 7 is a timing diagram of another embodiment of a display panel;

FIG. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a fingerprint detection circuit according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another fingerprint detection circuit according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of another fingerprint detection circuit according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of another fingerprint detection circuit according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of another fingerprint detection circuit according to an embodiment of the present invention;

FIG. 15 is a schematic diagram of another fingerprint detection circuit according to an embodiment of the present invention;

FIG. 16 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of another display panel provided in the embodiment of the present invention;

FIG. 18 is a schematic structural diagram of another display panel provided in an embodiment of the present invention;

FIG. 19 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 20 is a schematic structural diagram of another display panel provided in an embodiment of the invention;

FIG. 21 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 22 is a schematic structural diagram of another display panel provided in an embodiment of the invention;

FIG. 23 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 24 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 25 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 26 is a schematic diagram of another display panel according to an embodiment of the present invention;

fig. 27 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 28 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 29 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 30 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 31 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 32 is a schematic structural diagram of another display panel provided in an embodiment of the invention;

FIG. 33 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 34 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 35 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

fig. 36 is a schematic structural diagram of another display panel provided in an embodiment of the present invention;

fig. 37 is a schematic structural diagram of another display panel provided in an embodiment of the invention;

FIG. 38 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 39 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

FIG. 40 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 41 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 42 is a timing diagram illustrating driving of another display panel according to an embodiment of the present invention;

fig. 43 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As described in the background art, the technology for detecting fingerprints under a screen is not suitable for a curved screen and a folding screen, and the inventor finds that the technology for detecting fingerprints under a screen is to arrange/attach a fingerprint detection circuit below (on the back of) a display panel, and the fingerprint detection circuit detects fingerprint images through the display panel. In the under-screen fingerprint detection technology, a fingerprint detection circuit is disposed outside a display panel, and the total thickness increases after the display panel and the fingerprint detection circuit are stacked on each other. For curved screens and folding screens, the requirements on thickness are strict, and the thickness is required to be smaller. Therefore, the underscreen fingerprint detection technique is no longer applicable to curved screens and folded screens.

To solve the above technical problem, the present invention provides a display panel, fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 1, a display panel 6 includes: a pixel circuit 1 and a fingerprint detection circuit 2, the pixel circuit 1 comprising a light emitting device.

The pixel circuit 1 is connected to the scanning line S, the data line Vdata, the initializing signal line Vref, the first power supply Vdd, and the second power supply Vss, respectively, and the pixel circuit 1 is configured to drive the light emitting device to emit light based on signals supplied from the scanning line S, the data line Vdata, the initializing signal line Vref, the first power supply Vdd, and the second power supply Vss.

The fingerprint detection circuit 2 comprises a reset signal control end RS, a reset signal input end IN, a power end VC, a signal output end OUT and a photosensitive device, and the fingerprint detection circuit 2 is used for resetting the photosensitive device based on signals input by the reset signal control end RS and the reset signal input end IN and outputting a fingerprint detection signal through the signal output end OUT;

wherein, the reset signal control end RS is connected with the reset control signal line Rest or the scanning line S,

and/or, the reset signal input terminal IN is connected with the reset signal line Vrst or the initialization signal line Vref or the scanning line S,

and/or, the power source terminal VC is connected to the third power source line Vdds or the first power source Vdd or the scan line S,

and/or, the signal output terminal OUT is connected to the signal read line Rout or the data line Vdata.

The scan line S may include at least one signal line, for example, a scan line for controlling writing of an initialization voltage provided by the initialization signal line Vref to the light emitting device, a scan line for controlling writing of a data voltage provided by the data line Vdata to the pixel circuit, and a scan line for controlling a path formed between the first power supply Vdd, the light emitting device, and the second power supply Vss, which is not particularly limited in this embodiment.

The pixel circuit 1 and the fingerprint detection circuit 2 in this embodiment can be both disposed in the display area, so that the display panel 6 can realize fingerprint identification while realizing display. The light emitting device of the pixel circuit 1 provides a source of illumination for the light sensing device. Different fingerprints are different in the reflection condition of light emitted by the light emitting device, so that the illumination intensity received by the photosensitive device is different, different signals are output by the photosensitive device when different illumination intensities are received, and then different fingerprint detection signals are output by the fingerprint detection circuit 2, and the detection of the fingerprints is realized. Illustratively, the fingerprint detection signal may be a current signal. The reset signal control terminal RS, the reset signal input terminal IN, the power supply terminal VC, and the signal output terminal OUT may be connected to separate signal lines, or signal lines connected to the multiplexing pixel circuit 1. When the fingerprint detection circuit 2 and the pixel circuit 1 multiplex signal lines, the number and the types of signals required for realizing light emission control and fingerprint identification can be reduced, the driving method is simplified, the structure of the display panel 6 is simplified, and the cost is reduced. It should be noted that one pixel circuit 1 drives one sub-pixel to emit light, and a plurality of pixel circuits 1 corresponding to a plurality of sub-pixels in the display panel may share one fingerprint detection circuit 2, for example, three sub-pixels included in one pixel may correspond to one fingerprint detection circuit 2, or a row of sub-pixels may correspond to one fingerprint detection circuit 2. I.e. a plurality of pixel circuits 1 corresponds to one fingerprint detection circuit 2.

The signal line that fingerprint detection circuit connects is multiplexed with the signal line that pixel circuit connects, and then realizes when drive display panel shows, realizes fingerprint detection's function simultaneously, because of the multiplexing of signal line, can practice thrift the quantity of signal line, simplifies display panel's structure. And fingerprint detection circuit and pixel circuit all set up the display area at display panel, and then realize the function that fingerprint detected in the screen, and display panel is applicable in curved surface screen and folding screen, and the suitability is stronger.

Fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 2, optionally, the fingerprint detection circuit 2 further includes a reset module 21 and a signal output module 22, the reset module 21 is configured to reset the photosensitive device 23 and the signal output module 22 based on signals of a reset signal control terminal RS and a reset signal input terminal IN, and the signal output module 22 is configured to generate and output a fingerprint detection signal based on signals of the reset signal control terminal RS, the reset signal input terminal IN, the power supply terminal VC, and a photosensitive state of the photosensitive device 23.

The pixel circuit 1 further includes a data writing module 11, a driving module 12 and an initializing module 13, the scan lines include a first scan line S1, a second scan line S2 and/or a third scan line S3, the data writing module 11 is connected to the data line Vdata and the first scan line S1, the data writing module 11 is configured to transmit a data voltage output by the data line Vdata to a control terminal of the driving module 12, the initializing module 13 is connected to an initializing signal line Vref, the second scan line S2 and/or the third scan line S3, the initializing module 13 is configured to initialize the control terminal of the driving module 12 and/or the light emitting device 14, the driving module 12 and the light emitting device 14 are connected between a first power supply Vdd and a second power supply Vss, and the driving module 12 is configured to generate a driving current according to the data voltage and drive the light emitting device 14 to emit light.

The embodiment exemplarily shows that the first terminal of the photosensitive device 23 is connected to the reset module 21, and the other terminal is connected to the fourth power source Vcom. The reset module 21 resets the photosensitive device 23 and the signal output module 22 based on the signals of the reset signal control terminal RS and the reset signal input terminal IN; specifically, when the signal input by the reset signal control terminal RS is an active signal, the reset module 21 transmits the voltage input by the reset signal input terminal IN to the first terminal of the photosensitive device 23 and the signal output module 22 to reset the photosensitive device 23 and the signal output module 22, where IN the case that the active signal is applied by the reset signal control terminal RS, the reset signal input terminal IN is communicated with the photosensitive device 23 and the signal output module 22. Under different touch conditions (i.e. under different fingerprints), the light intensities received by the light sensing device 23 are different, and the generated currents are different, so that the signal output module 22 generates different fingerprint detection signals according to different currents, wherein the light sensing state of the light sensing device 23 can be changed according to the change of the received light intensities.

In the present embodiment, three scanning lines including the first scanning line S1, the second scanning line S2, and the third scanning line S3 are exemplarily shown, the initialization module 13 transmits the initialization voltage supplied from the initialization signal line Vref to the control terminal of the driving module 12 and the first terminal of the light emitting device 14 when the second scanning line S2 and the third scanning line S3 are active signals, and the second terminal of the light emitting device 14 is connected to the second power supply Vss. When the first scan line S1 is an active signal, the data writing module 11 transmits a data voltage provided by the data line Vdata to the control terminal of the driving module 12, so as to implement writing of the data voltage. The driving module 12 generates a driving current according to the data voltage to drive the light emitting device 14 to emit light.

In this embodiment, the signal line multiplexing initialization signal line Vref accessed by the reset signal control terminal RS is exemplarily shown, that is, when the pixel circuit 1 initializes the driving module 12 and the light emitting device 14, the fingerprint detection circuit 2 synchronously resets the light sensing device 23. For example, after the resetting of the light sensing device 23 is completed, the output of the fingerprint detection signal may be performed during the light emitting phase of the light emitting device 14. The fingerprint detection circuit 2 shares with the signal lines of the pixel circuit 1, so that the number and the types of signals required for realizing light emission control and fingerprint identification can be reduced, the driving method is simplified, the structure of the display panel is simplified, and the cost is reduced.

Fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 3, optionally, the pixel circuit 1 further includes a light-emitting control module 15 and a compensation module 16, the scan line further includes a light-emitting control signal line EM and a fourth scan line S4, the light-emitting control module 15 is connected to the light-emitting control signal line EM, and the light-emitting control module 15, the driving module 12, and the light-emitting device 14 are connected between a first power supply Vdd and a second power supply Vss.

The compensation module 16 is connected to the fourth scan line S4, the compensation module 16 is connected between the first end and the control end of the driving module 12, and the compensation module 16 is configured to perform threshold compensation on the driving module 12 based on a signal on the fourth scan line S4.

Optionally, the light-emitting control module 15 includes a first light-emitting control module 151 and a second light-emitting control module 152, the first light-emitting control module 151 is connected between the second end of the driving module 12 and the first power Vdd, the second light-emitting control module 152 is connected between the first end of the driving module 12 and the second power Vss, and the light-emitting control module 15 is configured to communicate a path among the first power Vdd, the driving module 12, the light-emitting device 14, and the second power Vss when the light-emitting control signal line EM is an active signal.

Optionally, a first end of the data writing module 11 is connected to the data line Vdata, the other end of the data writing module 11 is connected to a second end of the driving module 12, a first end of the initialization module 13 is connected to the initialization signal line Vref, a second end of the initialization module 13 is connected to the control end of the driving module 12, and a third end of the initialization module 13 is connected to the first end of the light emitting device 14.

Optionally, the pixel circuit 1 further includes a storage module 17, and the storage module 17 is connected to the control end of the driving module 12 and is configured to store the voltage at the control end of the driving module 12.

Fig. 3 exemplarily shows that the reset signal input terminal IN and the power supply terminal VC of the reset block 21 are both connected to the first power supply Vdd, the reset signal control terminal RS of the reset block 21 is connected to the emission control signal line EM, the second terminal of the photo sensor device 23 is connected to the second power supply Vss, and the signal output terminal OUT of the signal output block 22 is connected to the data line Vdata. To facilitate description of the operation process of the display panel, this embodiment exemplarily shows a specific structure of the display panel shown IN fig. 3, and fig. 4 is a schematic structural diagram of another display panel provided IN the embodiment of the present invention, and referring to fig. 3 and 4, optionally, the reset module 21 includes a reset transistor Tr, a first pole of the reset transistor Tr is used as a reset signal input terminal IN, a second pole of the reset transistor Tr is respectively connected to the signal output module 22 and the photosensitive device 23, a gate of the reset transistor Tr is used as a reset signal control terminal RS, and a first pole of the reset transistor Tr is connected to the initialization signal line Vref or the first power supply Vdd. Alternatively, the gate of the reset transistor Tr is connected to the first scan line S1, the second scan line S2, the third scan line S3, the fourth scan line S4, or the emission control signal line EM. To illustrate a specific structure of the fingerprint detection circuit 2, in the present embodiment, the signal output module 22 includes a signal reading transistor Ts and an output transistor Tf, a gate of the signal reading transistor Ts is connected to a second pole of the reset transistor Tr, a first pole of the signal reading transistor Ts is used as a power supply terminal VC, a second pole of the signal reading transistor Ts is connected to a first pole of the output transistor Tf, a second pole of the output transistor Tf is used as a signal output terminal OUT, and a gate of the output transistor Tf is connected to a signal output control line Select. Optionally, the driving module 12 includes a first transistor T1, the compensation module 16 includes a second transistor T2, the data writing module 11 includes a third transistor T3, the initialization module 13 includes a fourth transistor T4 and a fifth transistor T5, the first light emission control module 151 includes a sixth transistor T6, the second light emission control module 152 includes a seventh transistor T7, and the storage module 17 includes a storage capacitor Cst. A first electrode of the third transistor T3 is connected to the data line Vdata, a second electrode of the third transistor T3 is connected to the first electrode of the first transistor T1, a gate electrode of the third transistor T3 is connected to the first scan line S1, a first electrode of the second transistor T2 is connected to the second electrode of the first transistor T1, a second electrode of the second transistor T2 is connected to the gate electrode of the first transistor T1, a gate electrode of the second transistor T2 is connected to the fourth scan line S4, a first electrode of the fourth transistor T4 is connected to the initialization signal line Vref, a second electrode of the fourth transistor T4 is connected to the gate electrode of the first transistor T1, a gate electrode of the fourth transistor T4 is connected to the second scan line S2, a first electrode of the fifth transistor T5 is connected to the initialization signal line Vref, a second electrode of the fifth transistor T5 is connected to the first end of the light emitting device 14, a gate electrode of the fifth transistor T5 is connected to the third scan line S3, a first electrode of the sixth transistor T6 is connected to the first power supply Vdd, a sixth transistor T6 is connected to the first electrode of the sixth transistor T1, a gate electrode of the seventh transistor T7 is connected to the first transistor T7, and a gate electrode of the light emitting transistor T7 is connected to the first transistor T1, and a gate electrode of the seventh transistor T7, and a second transistor T1 are connected to the second scanning line EM.

Fig. 5 is a driving timing diagram of a display panel according to an embodiment of the present invention, where the timing diagram shown in fig. 5 is applied to the display panel shown in fig. 4, and exemplarily, in fig. 5, the first transistor T1, the third transistor T3, the sixth transistor T6, and the seventh transistor T7 are low-temperature polysilicon transistors, and further, are all P-type transistors, and the second transistor T2, the fourth transistor T4, the fifth transistor T5, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all oxide transistors, and further, are all N-type transistors. Illustratively, the signals on the third scan line S3 and the second scan line S2 are the same. The working process of the display panel comprises an initialization phase t1, a data writing phase t2, a light emitting phase t3, a reset phase t4, a signal generating phase t5 and a signal outputting phase t6.

In the initialization period t1, the signals on the second scan line S2 and the third scan line S3 are at a high level, the signal on the first scan line S1 is at a high level, the signal on the emission control signal line EM is at a high level, and the signals on the fourth scan line S4 and the signal output control line Select are both at a low level. The second transistor T2, the third transistor T3, the sixth transistor T6, the seventh transistor T7, and the output transistor Tf are all turned off, the fourth transistor T4, the fifth transistor T5, and the reset transistor Tr are turned on, the turned-on fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the gate of the first transistor T1, and the turned-on fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light emitting device 14, thereby avoiding the influence of the residual charge of the first end of the light emitting device 14 on the light emission brightness. Meanwhile, in the initialization period t1, the turned-on reset transistor Tr transmits the voltage supplied from the first power source Vdd to the first terminal of the photosensitive device 23, resetting the photosensitive device 23.

In the data writing phase t2, signals on the first scan line S1, the second scan line S2, the third scan line S3, and the signal output control line Select are at a low level, and signals on the fourth scan line S4 and the light emission control signal line EM are at a high level. The fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the output transistor Tf are all turned off, and the second transistor T2, the third transistor T3, and the reset transistor Tr are turned on. The turned-on second transistor T2 and third transistor T3 write the data voltage supplied from the data line Vdata into the gate of the first transistor T1 while correlating the gate voltage of the first transistor T1 with the threshold voltage of the first transistor T1, thereby achieving data voltage writing and threshold voltage compensation to the first transistor T1. While continuing to reset the photosensitive device 23 during the data writing phase t 2.

In this embodiment, the reset period t4 coincides with a period of time when the emission control signal line EM is at a high level, that is, in the non-emission period of the pixel circuit, the fingerprint detection circuit resets the photosensitive device 23.

In the light emitting period T3 (the signal generating period T5 and the signal outputting period T6 are in the light emitting period), the signal on the first scan line S1 is at a high level, the signals on the fourth scan line S4, the second scan line S2, the third scan line S3 and the light emitting control signal line EM are at a low level, the second transistor T2, the third transistor T3, the fourth transistor T4 and the fifth transistor T5 are turned off, the sixth transistor T6 and the seventh transistor T7 are turned on, and the first transistor T1 generates a driving current according to the gate voltage thereof and the voltage supplied by the first power supply Vdd, so as to drive the light emitting device 14 to emit light.

In the signal generation phase t5, the signal on the emission control signal line EM is at a low level, the signal on the signal output control line Select is at a low level, and both the reset transistor Tr and the output transistor Tf are turned off. The light emitting device 14 is used for providing illumination for the photosensitive device 23, the fingerprints include valleys and ridges, and the reflection conditions of different fingerprints to light are different, so that the intensity of illumination received by the photosensitive device 23 is different, and further, the charge condition accumulated at the first end of the photosensitive device 23 is different.

In the signal output stage t6, the signal on the light emission control signal line EM is at a low level, the signal on the signal output control line Select is at a high level, the reset transistor Tr is turned off, the output transistor Tf is turned on, the signal reading transistor Ts generates different fingerprint detection signals according to different voltages of the gate electrode of the signal reading transistor Ts, and the fingerprint detection signals are output through the turned-on output transistor Tf and the data line Vdata to complete fingerprint detection.

It should be noted that, when the display panel displays, each frame of the display includes an initialization phase t1, a data writing phase t2 and a light emitting phase t3, and the display process of the display panel only includes a reset phase t4, a signal generating phase t5 and a signal outputting phase t6, i.e. a fingerprint identification is performed.

In the embodiment, a plurality of signal lines are shared, so that the fingerprint detection function is realized, the number and the types of signals in the display panel can be greatly saved, the structure of the display panel is simplified, and the cost is reduced.

Referring to fig. 6, optionally, a first end of the photosensitive device 23 is connected to the reset module 21, and a second end of the photosensitive device 23 is connected to the first power supply Vdd or the second power supply Vss or the initialization signal line Vref. Fig. 7 is a timing diagram of another driving method for a display panel according to an embodiment of the invention, and the driving timing diagram shown in fig. 7 is suitable for the display panel shown in fig. 6. The pixel circuit shown IN fig. 6 is different from the pixel circuit shown IN fig. 4 IN that the second transistor T2, the fourth transistor T4, the fifth transistor T5, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf IN fig. 6 are all low-temperature polysilicon transistors, and further are all P-type transistors, the second terminal of the light sensing device 23 is connected to the first power supply Vdd, the gate (reset signal control terminal RS) of the reset transistor Tr is connected to the reset control signal line Rest, the first terminal (reset signal input terminal IN) of the reset transistor Tr is connected to the reset signal line Vrst, the first terminal (power supply terminal VC) of the signal reading transistor Ts is connected to the third power supply Vdds, and the output transistor Tf (signal output terminal OUT) is connected to the signal reading line Rout.

Referring to fig. 6 and 7, the operation process of the display panel includes an initialization phase t1, a data writing phase t2, a light emitting phase t3, a reset phase t4, a signal generating phase t5, and a signal outputting phase t6.

In the initialization stage t1, signals on the second scan line S2 and the third scan line S3 are at a low level, and signals on the first scan line S1, the fourth scan line S4, the emission control signal line EM, the reset signal line Rest, and the signal output control line Select are all at a high level. The second transistor T2, the third transistor T3, the sixth transistor T6, the seventh transistor T7, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all turned off, the fourth transistor T4 and the fifth transistor T5 are turned on, the turned-on fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the gate electrode of the first transistor T1, and the turned-on fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light emitting device 14, thereby avoiding the influence of the residual charge of the first end of the light emitting device 14 on the light emission brightness.

In the data writing phase t2, signals on the first scan line S1 and the fourth scan line S4 are at a low level, and signals on the second scan line S2, the third scan line S3, the light emission control signal line EM, the reset signal line Rest, and the signal output control line Select are all at a high level. The fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all turned off, and the second transistor T2 and the third transistor T3 are turned on. The turned-on second transistor T2 and third transistor T3 write the data voltage supplied from the data line Vdata into the gate of the first transistor T1 while correlating the gate voltage of the first transistor T1 with the threshold voltage of the first transistor T1, thereby achieving data voltage writing and threshold voltage compensation to the first transistor T1.

The reset phase t4, the signal generation phase t5 and the signal output phase t6 are all located within the light emitting phase t 3. In the whole light emitting period t3, the signals on the first scanning line S1, the fourth scanning line S4, the second scanning line S2, and the third scanning line S3 are at a high level, and the signal on the light emission control signal line EM is at a low level. The second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 are turned off, the sixth transistor T6 and the seventh transistor T7 are turned on, and the first transistor T1 generates a driving current according to a gate voltage thereof and a voltage supplied from the first power supply Vdd, and drives the light emitting device 14 to emit light.

In the reset period t4, the signal on the reset control signal line Rest is at a low level, the signal on the signal output control line Select is at a high level, the reset transistor Tr is turned on, and the output transistor Tf is turned off. The turned-on reset transistor Tr outputs the reset voltage transmitted by the reset signal line Vrst to the first end of the photosensitive device 23 and the gate of the signal reading transistor Ts, so that the reset of the voltages of the photosensitive device 23 and the signal reading transistor Ts is completed, and the influence of residual charges on the fingerprint detection result at this time during the previous fingerprint detection is avoided.

In the signal generation phase t5, the signal on the reset control signal line Rest is at a high level, the signal on the signal output control line Select is at a high level, and both the reset transistor Tr and the output transistor Tf are turned off. The light emitting device 14 is used for providing illumination for the photosensitive device 23, the fingerprints include valleys and ridges, and the reflection conditions of different fingerprints to light are different, so that the intensity of illumination received by the photosensitive device 23 is different, and further, the charge conditions accumulated at the first end of the photosensitive device 23 are different.

In the signal output stage t6, the signal on the reset control signal line Rest is at a high level, the signal on the signal output control line Select is at a low level, the reset transistor Tr is turned off, the output transistor Tf is turned on, the signal reading transistor Ts generates different fingerprint detection signals according to different voltages of the gate thereof, and the fingerprint detection signals are output through the turned-on output transistor Tf to complete fingerprint detection.

In this embodiment, the second end of the light sensing device 23 multiplexes the first power Vdd of the pixel circuit, so that the number of power supplies in the display panel can be reduced, and the structure of the display panel is simplified.

Fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and a difference between fig. 8 and fig. 6 is that the second terminal of the sensing device 23 in fig. 8 is multiplexed with the second power supply Vss of the pixel circuit, the timing diagram shown in fig. 7 is also applicable to fig. 8, and the working process of the display panel in fig. 8 is the same as that in fig. 6, and is not repeated herein.

Fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 9, optionally, a first end of the photosensitive device 23 is connected to the reset module 21, and a second end of the photosensitive device 23 is connected to the emission control signal line EM. Fig. 9 is different from fig. 6 in that the second end of the sensing device 23 in fig. 9 multiplexes the emission control signal line EM of the pixel circuit, the timing diagram shown in fig. 7 is also applicable to fig. 9, and the working process of the display panel in fig. 9 is the same as that in fig. 6, and is not repeated here.

In order to solve the problem of leakage current in the pixel circuit, the pixel circuit is designed as an LTPO circuit at present, that is, transistors included in the compensation module and the initialization module connected to the control terminal of the driving module are both oxide transistors, so as to reduce the magnitude of leakage current in the circuit. The fingerprint detection circuit may have various forms for the LTPO pixel circuit, and six specific fingerprint detection circuits are exemplarily shown in the present embodiment to be adapted to the LTPO circuit, and see fig. 10 to 15 in particular. In fig. 10, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all low temperature polysilicon transistors, and further, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all P-type transistors. In fig. 11, the reset transistor Tr and the output transistor Tf are both oxide transistors, and the signal reading transistor Ts is a low temperature polysilicon transistor, and further, the reset transistor Tr and the output transistor Tf are N-type transistors, and the signal reading transistor Ts is a P-type transistor. In fig. 12, the reset transistor Tr is an oxide transistor, the signal reading transistor Ts, and the output transistor Tf are all low temperature polysilicon transistors, and further, the reset transistor Tr is an N-type transistor, and the signal reading transistor Ts and the output transistor Tf are all P-type transistors. In fig. 13, the reset transistor Tr and the signal reading transistor Ts are both oxide transistors, and the output transistor Tf is a low-temperature polysilicon transistor, and further, the reset transistor Tr and the signal reading transistor Ts are both N-type transistors, and the output transistor Tf is a P-type transistor. In fig. 14, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all oxide transistors, further, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all N-type transistors, and a first pole of the reset transistor Tr is connected to a first pole of the signal reading transistor Ts. In fig. 15, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all oxide transistors, and further, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all N-type transistors. Any of the fingerprint detection circuits shown in fig. 10-15 can be combined with LTPO pixel circuits to achieve display and fingerprint detection of the display panel.

For the case that the second end of the photosensitive device is multiplexed with one of the first power supply, the second power supply, the initialization signal line and the light-emitting control signal line in the pixel circuit, if the pixel circuit is an LTPO pixel circuit, any one of the fingerprint detection circuits in fig. 10 to 15 can be selected to be combined with the pixel circuit to realize the display control and the fingerprint detection of the display panel, and the LTPO pixel circuit has small leakage current, which is beneficial to improving the uniformity of the display.

Fig. 16 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and the differences between fig. 16 and fig. 6 are that the second end of the photosensitive device 23 is connected to a fourth power source Vcom, the first pole (reset signal input end IN) of the reset transistor Tr is multiplexed with an initialization signal line Vref of the pixel circuit, an initialization voltage on the initialization signal line Vref is used as a reset voltage of the photosensitive device 23 and the signal reading transistor Ts, and other structures are the same as fig. 6, and the operation principle is the same as fig. 6, and are not repeated herein. The fingerprint detection circuit is multiplexed with the initialization signal line Vref in the pixel circuit, so that the types and the number of signals can be saved, the structure of the display panel is simplified, and the cost is reduced.

Fig. 17 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 17, a first electrode of the reset transistor Tr is optionally connected to the emission control signal line EM. The difference between fig. 17 and fig. 6 is that the second end of the photosensitive device 23 is connected to the fourth power source Vcom, the first electrode of the reset transistor Tr multiplexes the light-emitting control signal line EM of the pixel circuit, and the voltage on the light-emitting control signal line EM is used as the reset voltage of the photosensitive device 23 and the signal reading transistor Ts, the other structures are the same as those in fig. 6, and the operation principle is the same as that in fig. 6, and details are not repeated here. The fingerprint detection circuit can save the types and the number of signals, simplify the structure of the display panel and reduce the cost by multiplexing with the light-emitting control signal line EM in the pixel circuit.

Fig. 18 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 18, optionally, a gate of the reset transistor Tr is connected to the first scan line S1, the second scan line S2, the third scan line S3, or the fourth scan line S4.

Fig. 18 differs from fig. 6 in that the second terminal of the photosensitive device 23 is connected to the fourth power source Vcom, and the gate of the reset transistor Tr is connected to the second scan line S2. The other structures are the same as those in fig. 6, and are not described again in this embodiment. Fig. 19 is a timing diagram of driving another display panel according to an embodiment of the present invention, and the timing diagram shown in fig. 19 is applicable to the display panel shown in fig. 18.

In this embodiment, after the gate of the reset transistor Tr multiplexes the second scanning line S2, the initialization phase t1 and the reset phase t4 overlap. In the initialization stage T1/the reset stage T4, the signals on the second scan line S2 and the third scan line S3 are at a low level, the signals on the first scan line S1, the fourth scan line S4, the emission control signal line EM and the signal output control line Select are all at a high level, the second transistor T2, the third transistor T3, the sixth transistor T6, the seventh transistor T7 and the output transistor Tf are all turned off, the fourth transistor T4, the fifth transistor T5 and the reset transistor Tr are turned on, the turned-on fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the gate of the first transistor T1, and the turned-on fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light emitting device 14, so as to avoid the influence of the residual charge at the first end of the light emitting device 14 on the emission brightness. The turned-on reset transistor Tr outputs the reset voltage transmitted by the reset signal line Vrst to the first end of the photosensitive device 23 and the gate of the signal reading transistor Ts, so that the reset of the voltages of the photosensitive device 23 and the signal reading transistor Ts is completed, and the influence of residual charges on the fingerprint detection result at this time during the previous fingerprint detection is avoided. The working processes of the data writing stage t2, the light emitting stage t3, the signal generating stage t5 and the signal outputting stage t6 are the same as those of the structure shown in fig. 6, and are not described herein again. Wherein, the signal generating phase t5 and the signal outputting phase t6 are located within the light emitting phase t 3.

Fig. 20 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 20, the difference between fig. 20 and fig. 6 is that the second terminal of the photosensitive device 23 is connected to the fourth power source Vcom, and the gate of the reset transistor Tr multiplexes the third scan line S3. The other structures are the same as those in fig. 6, and are not described again in this embodiment. Fig. 21 is a timing diagram of another driving of a display panel according to an embodiment of the present invention, and the timing diagram shown in fig. 21 is suitable for the pixel circuit shown in fig. 20. In the structure shown in fig. 20, the signals on the second scanning line S2 and the third scanning line S3 are different. The working process of the display panel comprises a first initialization phase t11, a data writing phase t2, a second initialization phase t12, a light emitting phase t3, a reset phase t4, a signal generating phase t5 and a signal outputting phase t6.

In the first initialization phase t11, the signal on the second scan line S2 is at a low level, and the signals on the first scan line S1, the fourth scan line S4, the third scan line S3, the light emitting control signal line EM, and the signal output control line Select are all at a high level. The second transistor T2, the third transistor T3, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all turned off, the fourth transistor T4 is turned on, and the turned-on fourth transistor T4 writes the initialization voltage supplied from the initialization signal line Vref into the gate of the first transistor T1.

The data writing stage t2 is the same as the operation of the structure shown in fig. 6, and is not described herein again.

Since the gate of the reset transistor Tr multiplexes the third scanning line S3, the second initialization phase t12 and the reset phase t4 overlap, and in the second initialization phase t 12/the reset phase t4, the signals on the first scanning line S1, the second scanning line S2, the fourth scanning line S4, the emission control signal line EM, and the signal output control line Select are all at a high level, and the signal on the third scanning line S3 is at a low level. The second transistor T2, the third transistor T3, the fourth transistor T4, the sixth transistor T6, the seventh transistor T7, and the output transistor Tf are all turned off, the fifth transistor T5 and the reset transistor Tr are turned on, the turned-on fifth transistor T5 writes an initialization voltage to the first terminal of the light emitting device 14, and the turned-on reset transistor Tr writes a reset voltage on the reset signal line Vrst to the first terminal of the light sensing device 23 and the gate of the signal reading transistor Ts. I.e. the first terminal of the light emitting device 14, is initialized while the light sensing device 23 is reset.

The light-emitting stage t3, the signal generating stage t5 and the signal outputting stage t6 are the same as the process of the structure shown in fig. 6, and are not described again here.

Fig. 22 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 22, optionally, a gate of the reset transistor Tr is connected to the fourth scan line S4. The fourth scan line S4 in fig. 22 is the same signal as the first scan line S1. Fig. 22 differs from fig. 6 in that the second terminal of the light sensing device 23 is connected to the fourth power source Vcom, and the gate of the reset transistor Tr multiplexes the fourth scanning line S4. The other structures are the same as those in fig. 6, and the description of this embodiment is omitted here. Fig. 23 is a timing diagram of driving another display panel according to an embodiment of the invention, and the timing diagram shown in fig. 23 is suitable for the display panel shown in fig. 22.

In this embodiment, after the gate of the reset transistor Tr multiplexes the fourth scanning line S4, the data writing period t2 and the reset period t4 overlap. In the data writing stage t 2/the resetting stage t4, the signals on the first scan line S1 and the fourth scan line S4 are at a low level, and the signals on the second scan line S2, the third scan line S3, the light emission control signal line EM, and the signal output control line Select are all at a high level. The fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the output transistor Tf are all turned off, and the second transistor T2, the third transistor T3, and the reset transistor Tr are turned on. The turned-on second transistor T2 and third transistor T3 write the data voltage provided by the data line Vdata into the gate of the first transistor T1 while correlating the gate voltage of the first transistor T1 with the threshold voltage of the first transistor T1, thereby achieving data voltage writing and threshold voltage compensation for the first transistor T1. The turned-on reset transistor Tr outputs the reset voltage transmitted by the reset signal line Vrst to the first end of the photosensitive device 23 and the gate of the signal reading transistor Ts, so that the reset of the voltages of the photosensitive device 23 and the signal reading transistor Ts is completed, and the influence of residual charges on the fingerprint detection result at this time during the previous fingerprint detection is avoided. The working processes of the initialization stage t1, the light emitting stage t3, the signal generating stage t5 and the signal outputting stage t6 are the same as those of the structure shown in fig. 6, and are not described herein again. Wherein, the signal generating stage t5 and the signal outputting stage t6 are located within the light emitting stage t 3.

In the case where the second scanning line S2 is multiplexed with the gate of the reset transistor Tr, the pixel circuit of the display panel may be an LTPO pixel circuit. Fig. 24 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 24, the first transistor T1, the third transistor T3, the sixth transistor T6, and the seventh transistor T7 are all P-type transistors, and the second transistor T2, the fourth transistor T4, the fifth transistor T5, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all N-type transistors. The second transistor T2, the fourth transistor T4, and the fifth transistor T5 are oxide transistors, and have a small off-state leakage current, so that the variation of the gate potential of the first transistor T1 can be reduced, thereby ensuring the uniformity of display. As exemplarily shown in fig. 24, the second terminal of the light sensing device 23 multiplexes the second power source Vss, the first pole of the reset transistor Tr multiplexes the first power source Vdd, and the first pole of the signal reading transistor Ts multiplexes the first power source Vdd. Fig. 25 is a timing diagram illustrating another driving method of a display panel according to an embodiment of the present invention, and fig. 25 is applicable to the display panel shown in fig. 24. The working process of the display panel comprises an initialization phase t1, a data writing phase t2, a light emitting phase t3, a reset phase t4, a signal generating phase t5 and a signal outputting phase t6.

In the initialization stage t 1/reset stage t4, signals on the first scan line S1, the second scan line S2, the third scan line S3, and the emission control signal line EM are at a high level, and signals on the fourth scan line S4 and the signal output control line Select are both at a low level. The second transistor T2, the third transistor T3, the sixth transistor T6, the seventh transistor T7, and the output transistor Tf are all turned off, the fourth transistor T4, the fifth transistor T5, and the reset transistor Tr are turned on, the turned-on fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the gate electrode of the first transistor T1, and the turned-on fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light emitting device 14, thereby avoiding the influence of the residual charge of the first end of the light emitting device 14 on the emission brightness. The turned-on reset transistor Tr outputs the first power voltage transmitted by the first power Vdd to the first end of the light sensing device 23 and the gate of the signal reading transistor Ts, so that the voltage of the light sensing device 23 and the voltage of the signal reading transistor Ts are reset, and the influence of residual charge on the fingerprint detection result at this time during the previous fingerprint detection is avoided.

In the data writing phase t2, the signals on the first scan line S1, the second scan line S2, the third scan line S3, and the signal output control line Select are all at low level, and the signals on the fourth scan line S4 and the light emission control signal line EM are at high level. The fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the reset transistor Tr, and the output transistor Tf are all turned off, and the second transistor T2 and the third transistor T3 are turned on. The turned-on second transistor T2 and third transistor T3 write the data voltage provided by the data line Vdata into the gate of the first transistor T1 while correlating the gate voltage of the first transistor T1 with the threshold voltage of the first transistor T1, thereby achieving data voltage writing and threshold voltage compensation for the first transistor T1.

The signal generation phase t5 and the signal output phase t6 are both located within the light emitting phase t 3. In the entire light emission period t3, the signals on the second scanning line S2, the third scanning line S3, the fourth scanning line S4, and the light emission control signal line EM are at a low level, and the signal on the first scanning line S1 is at a high level. The second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 are turned off, the sixth transistor T6 and the seventh transistor T7 are turned on, and the first transistor T1 generates a driving current according to a gate voltage thereof and a voltage supplied from the first power supply Vdd, and drives the light emitting device 14 to emit light.

In the signal generation phase t5, the signal on the signal output control line Select is at a low level, and the reset transistor Tr and the output transistor Tf are both turned off. The light emitting device 14 is used for providing illumination for the photosensitive device 23, the fingerprints include valleys and ridges, and the reflection conditions of different fingerprints to light are different, so that the intensity of illumination received by the photosensitive device 23 is different, and further, the charge conditions accumulated at the first end of the photosensitive device 23 are different.

And in a signal output stage t6, the signal on the signal output control line Select is at a high level, the reset transistor Tr is turned off, the output transistor Tf is turned on, the signal reading transistor Ts generates different fingerprint detection signals according to different voltages of the grid electrode of the signal reading transistor Ts, and the fingerprint detection signals are output through the turned-on output transistor Tf to complete fingerprint detection.

Fig. 26 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and a difference between fig. 26 and fig. 24 is that the gate of the reset transistor Tr multiplexes the fourth scan line S4, that is, in a data writing stage, when the pixel circuit performs writing of a data voltage and compensation of a threshold voltage, the reset transistor Tr of the fingerprint detection circuit is turned on to reset the photosensitive device 23. Fig. 27 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and the difference between fig. 27 and fig. 24 is that the gate of the reset transistor Tr multiplexes the third scanning line S3, that is, when the pixel circuit initializes the light emitting device 14, the reset transistor Tr of the fingerprint detection circuit is turned on, and the photosensitive device 23 is reset.

Fig. 28 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 28, optionally, the signal output module 22 includes a signal obtaining transistor Ts and an output transistor Tf, a first electrode of the signal obtaining transistor Ts is used as the power supply terminal VC, a second electrode of the signal obtaining transistor Ts is connected to the first electrode of the output transistor Tf, a gate of the signal obtaining transistor Ts is connected to the reset module 21, a gate of the output transistor Tf is connected to the output control signal line Select, the first scan line S1, the second scan line S2, or the third scan line S3, and a second electrode of the output transistor Tf is used as the signal output terminal OUT. As exemplarily shown in fig. 28, the gate of the output transistor Tf is connected to the second scan line S2. The difference between the structure shown in fig. 28 and fig. 6 is that the second terminal of the light sensing device 14 is connected to the fourth power source Vcom, the first pole of the signal reading transistor Ts is multiplexed with the first power source Vdd, the gate of the output transistor Tf is multiplexed with the second scan line S2, and the connection structures of other transistors are the same as those in fig. 6, and are not described again here. Fig. 29 is a driving timing diagram of another display panel according to an embodiment of the invention, and the timing diagram shown in fig. 29 is applicable to the display panel shown in fig. 28. The timing shown in fig. 29 is different from the timing shown in fig. 7 in that the signal output stage t6 coincides with the initialization stage t1 of the second frame t02 of the pixel circuit, that is, in the light emission stage t3 of the first frame t01 of the pixel circuit, the fingerprint detection circuit completes the reset stage t4 and the signal generation stage t5 to generate the fingerprint signal, and in the initialization stage t1 of the second frame t02 of the pixel circuit, the output of the fingerprint detection signal is synchronously performed. Fig. 30 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 30, the difference between fig. 30 and fig. 28 is that a gate of an output transistor Tf is connected to a first scan line S1 or a fourth scan line S4, and signals of the first scan line S1 and the fourth scan line S4 are the same as each other in this embodiment. The operation of the structure shown in fig. 30 differs from that of fig. 28 in that: the signal output stage t6 coincides with the data writing stage t2 of the second frame of the pixel circuit, that is, when the writing of the data voltage and the compensation of the threshold voltage are performed in the second frame of the pixel circuit, the fingerprint detection signal of the previous frame is simultaneously output.

Fig. 31 is a schematic structural diagram of another display panel according to an embodiment of the disclosure, and referring to fig. 31, the difference between fig. 31 and fig. 28 is that the gate of the output transistor Tf is connected to the third scan line S3. In the structure shown in fig. 31, signals on the second scanning line S2 and the third scanning line S3 are different to initialize the gate of the first transistor T1 and the light emitting device 14 at different stages, respectively. The operation of the structure shown in fig. 31 differs from that of fig. 28 in that: when the light emitting device 14 is initialized in the second frame in which the pixel circuit performs display, the output of the fingerprint detection signal is performed at the same time.

Fig. 32 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and the difference between fig. 32 and fig. 24 is that a gate of the reset transistor Tr is connected to the reset signal line Rest, and a gate of the output transistor Tf multiplexes the second scan line S2. Fig. 33 is a timing diagram of driving another display panel according to an embodiment of the invention, and the timing diagram shown in fig. 33 is applicable to the display panel shown in fig. 32. In this embodiment, the initialization phase T1 and the signal output phase T6 of the second frame T02 coincide, that is, when the light emitting device 14 and the first transistor T1 are initialized in the pixel circuit second frame T02, the fingerprint detection circuit outputs the fingerprint detection signal generated in the light emitting phase T3 of the first frame T01. In the data writing phase t2, the pixel circuit performs writing of a data voltage and compensation of a threshold voltage. In a reset phase t4, the fingerprint detection circuit resets the photosensitive device 23. In the light emitting period T4, the driving current generated by the first transistor T1 drives the light emitting device 14 to emit light, and at the same time, the gate of the signal reading transistor Ts generates different voltages due to different light sensing states of the light sensing device 23.

Fig. 34 is a schematic structural diagram of another display panel according to an embodiment of the disclosure, and referring to fig. 34, optionally, the gate of the output transistor Tf is connected to the fourth scan line S4. Fig. 34 differs from fig. 32 in that the gate of the output transistor Tf multiplexes the fourth scan line S4, that is, when the pixel circuit performs data voltage writing and threshold voltage compensation for the second frame, the output transistor Tf of the fingerprint detection circuit is turned on, and then outputs the fingerprint detection signal generated by the pixel circuit in the light-emitting stage of the first frame.

Fig. 35 is a schematic structural diagram of another display panel according to an embodiment of the present invention, in the structure shown in fig. 35, signals on the second scan line S2 and the third scan line S3 are different, so as to initialize the gate of the first transistor T1 and the light emitting device 14 at different stages respectively. Fig. 35 differs from fig. 32 in that the gate of the output transistor Tf multiplexes the third scan line S3, that is, when the pixel circuit initializes the light emitting device 14 in the second frame, the output transistor Tf of the fingerprint detection circuit is turned on, and then outputs the fingerprint detection signal generated by the pixel circuit in the light emitting stage of the first frame.

Fig. 36 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 36, optionally, the first electrode of the signal obtaining transistor Ts is connected to the first power supply Vdd. Fig. 37 is different from fig. 6 in that the second terminal of the light sensing device 23 is connected to the fourth power source Vcom, the first terminal of the signal obtaining transistor Ts is connected to the first power source Vdd, and the other structure is the same as fig. 6. The timing chart shown in fig. 7 is also applicable to fig. 36, and the specific working process of the display panel shown in fig. 36 is not described herein again.

Fig. 37 is a schematic structural view of another display panel according to the embodiment of the present invention, and optionally, a first electrode of the signal obtaining transistor Ts is connected to the emission control signal line EM. Fig. 37 is different from fig. 6 in that the second terminal of the light sensing device 23 is connected to the fourth power source Vcom, the first terminal of the signal acquisition transistor Ts is connected to the emission control signal line EM, and the other structure is the same as fig. 6. The timing chart shown in fig. 7 is also applicable to fig. 37, and the specific working process of the display panel shown in fig. 37 is not described herein again.

Fig. 38 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and the difference between fig. 38 and fig. 37 is that the second transistor T2, the fourth transistor T4, the fifth transistor T5, the reset transistor Tr, the signal reading transistor Ts, and the output transistor Tf are all oxide transistors, and further, are all N-type transistors, and signals on the first scan line S1 and the fourth scan line S4 are different. Fig. 39 is a timing diagram of another driving of a display panel according to an embodiment of the invention, and the timing diagram shown in fig. 39 is suitable for the display panel shown in fig. 38. The working process of the display panel comprises an initialization phase t1, a data writing phase t2, a light emitting phase t3, a reset phase t4, a signal generating phase t5 and a signal outputting phase t6.

In the initialization stage t1, signals on the first scan line S1, the second scan line S2, the third scan line S3, and the emission control signal line EM are at a high level, and signals on the fourth scan line S4, the reset control signal line Rest, and the signal output control line Select are all at a low level. The second transistor T2, the third transistor T3, the sixth transistor T6, the seventh transistor T7, the reset transistor Tr, and the output transistor Tf are all turned off, the fourth transistor T4 and the fifth transistor T5 are turned on, the fourth transistor T4 writes the initialization voltage provided by the initialization signal line Vref into the gate of the first transistor T1, and the fifth transistor T5 writes the initialization voltage provided by the initialization signal line Vref into the first end of the light emitting device 14, thereby avoiding the influence of the residual charge of the first end of the light emitting device 14 on the light emission brightness.

In the data writing phase t2, signals on the first scan line S1, the second scan line S2, the third scan line S3, the reset control signal line Rest, and the signal output control line Select are all at a low level, and signals on the fourth scan line S4 and the light emission control signal line EM are at a high level. The fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the reset transistor Tr, and the output transistor Tf are all turned off, and the second transistor T2 and the third transistor T3 are turned on. The turned-on second transistor T2 and third transistor T3 write the data voltage supplied from the data line Vdata into the gate of the first transistor T1 while correlating the gate voltage of the first transistor T1 with the threshold voltage of the first transistor T1, thereby achieving data voltage writing and threshold voltage compensation to the first transistor T1.

In the reset phase T4, signals on the second scan line S2, the third scan line S3 and the fourth scan line S4 are all at a low level, signals on the first scan line S1 light-emitting control signal line EM and the reset control signal line Rest are all at a low level and at a high level, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7 and the output transistor Tf are all turned off, the reset transistor Tr is turned on, the turned-on reset transistor Tr outputs the reset voltage transmitted by the reset signal line Vrst to the first end of the photosensitive device 23 and the gate of the signal reading transistor Ts, so as to complete the reset of the voltages of the photosensitive device 23 and the signal reading transistor Ts, and avoid the influence of residual charges on the fingerprint detection result at this time during the previous fingerprint detection.

In the signal generation phase t 5/light emission phase t3, the signals on the second scanning line S2, the third scanning line S3, the fourth scanning line S4, and the light emission control signal line EM are at a low level, and the signal on the first scanning line S1 is at a high level. The second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 are turned off, the sixth transistor T6 and the seventh transistor T7 are turned on, and the first transistor T1 generates a driving current according to a gate voltage thereof and a voltage supplied from the first power supply Vdd, driving the light emitting device 14 to emit light. The signals on the reset control signal line Rest and the signal output control line Select are both low levels, and the reset transistor Tr and the output transistor Tf are both off. The light emitting device 14 is used for providing illumination for the photosensitive device 23, the fingerprints include valleys and ridges, and the reflection conditions of different fingerprints to light are different, so that the intensity of illumination received by the photosensitive device 23 is different, and further, the charge condition accumulated at the first end of the photosensitive device 23 is different.

In the signal output stage t6, the signal on the signal output control line Select is at a high level, the reset transistor Tr is turned off, the output transistor Tf is turned on, the signal reading transistor Ts generates different fingerprint detection signals according to different voltages of the gate thereof, and the fingerprint detection signals are output through the turned-on output transistor Tf to complete fingerprint detection.

It is to be noted that the timing shown in fig. 39 shows the timing of two frames when the pixel circuit performs display, the fingerprint detection circuit completes the reset of the light sensing device 23 in the first frame t01, and generates a fingerprint detection signal in the light emission period t3 of the first frame t01, and outputs the fingerprint detection signal in the second frame t 02.

Fig. 40 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 40, optionally, the reset signal control terminal RS is connected to a reset control signal line Rest, the reset signal input terminal IN is connected to a light-emitting control signal line EM, the power supply terminal VC is connected to a first power supply Vdd, and the second terminal of the photosensitive device 23 is connected to a second power supply Vss. The timing chart shown in fig. 7 is applicable to fig. 40, and the working process shown in fig. 40 is not described in detail in this embodiment. The fingerprint detection circuit in fig. 40 multiplexes the emission control signal line EM, the first power supply Vdd, and the second power supply Vss in the pixel circuit, so that the kind and number of signal lines in the display panel can be further saved, and the structure of the display panel can be further simplified.

Fig. 41 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 41, optionally, the second pole of the output transistor Tf is connected to the data line Vdata, the display panel further includes a time-sharing control circuit 24, and the time-sharing control circuit 24 is configured to provide a data voltage to the data line Vdata and read a fingerprint detection signal in a time-sharing manner based on the first time-sharing control signal and the second time-sharing control signal.

The time-sharing control circuit 24 controls the data voltage on the data line Vdata to be transmitted into the display panel when the second time-sharing control signal is an effective signal, and when the first time-sharing control signal is an effective signal, the data line Vdata does not transmit the data line to the pixel circuit any more, but reads the fingerprint detection signal to an external chip, so that the fingerprint detection circuit multiplexes the data line, the data and the type of the signal line are saved, and the structure of the display panel is simplified.

With continued reference to fig. 41, optionally, the time-sharing control circuit 24 includes: a first time-sharing control transistor M1 and a second time-sharing control transistor M2, wherein a first pole of the first time-sharing control transistor M1 is connected with a second pole of the output transistor Tf, a second pole of the first time-sharing control transistor M1 is connected with the fingerprint driving chip 3, a grid electrode of the first time-sharing control transistor M1 is connected with a first time-sharing control signal line TRO, and the first time-sharing control signal line TRO is used for providing a first time-sharing control signal;

the first pole of the second time-sharing control transistor M2 is connected to the second pole of the output transistor Tf, the second pole of the second time-sharing transistor M2 is connected to the display driver chip 4, the gate of the second time-sharing control transistor M2 is connected to a second time-sharing control signal line TD, and the second time-sharing control signal line TD is used for providing a second time-sharing control signal.

Fig. 42 is a driving timing diagram of a display panel according to an embodiment of the invention, and the timing diagram shown in fig. 42 is applied to the display panel shown in fig. 41, and exemplarily, in fig. 41, the first transistor T1, the third transistor T3, the sixth transistor T6, and the seventh transistor T7 are low temperature polysilicon transistors, and further, are P-type transistors, and the rest transistors are oxide transistors, i.e., N-type transistors.

IN this embodiment, the reset signal control terminal RS is electrically connected to the emission control signal line EM, the reset signal input terminal IN is connected to the first power supply Vdd, the power supply terminal VC is connected to the first power supply Vdd, the second terminal of the light sensing device 23 is connected to the second power supply Vss, and the signal output terminal OUT is connected to the data line Vdata. The working process of the display panel comprises an initialization phase t1, a data writing phase t2, a light emitting phase t3, a reset phase t4, a signal generating phase t5 and a signal outputting phase t6.

In the initialization stage t1, signals on the second scan line S2 and the third scan line S3 are at a high level, a signal on the first scan line S1 is at a high level, signals on the emission control signal line EM and the second time-sharing control signal line TD are both at a high level, and signals on the fourth scan line S4, the signal output control line Select and the first time-sharing control signal line TRO are all at a low level. The second transistor T2, the third transistor T3, the sixth transistor T6, the seventh transistor T7, the output transistor Tf, and the first time-sharing control transistor M1 are all turned off, the fourth transistor T4, the fifth transistor T5, the reset transistor Tr, and the second time-sharing control transistor M2 are turned on, the turned-on fourth transistor T4 writes the initialization voltage supplied from the initialization signal line Vref into the gate of the first transistor T1, and the turned-on fifth transistor T5 writes the initialization voltage supplied from the initialization signal line Vref into the first end of the light emitting device 14, thereby avoiding the influence of the residual charge of the first end of the light emitting device 14 on the light emission brightness. At the same time, in the initialization phase t1, the photosensitive device 23 is reset.

In the data writing phase t2, signals on the first scan line S1, the second scan line S2, the third scan line S3, the signal output control line Select, and the first timing control signal line TRO are at a low level, and signals on the second timing control signal line TD, the fourth scan line S4, and the light emission control signal line EM are all at a high level. The fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, the first timing control transistor M1, and the output transistor Tf are all turned off, and the second transistor T2, the third transistor T3, the reset transistor Tr, and the second timing control transistor M2 are turned on. The turned-on second timing control transistor M2, the second transistor T2, and the third transistor T3 write the data voltage provided by the data line Vdata into the gate of the first transistor T1 while correlating the gate voltage of the first transistor T1 with the threshold voltage of the first transistor T1, thereby achieving data voltage writing and threshold voltage compensation for the first transistor T1. At the same time, in the data writing phase t2, the photosensitive device 23 is reset.

In the light emitting period T3 (the signal generating period T5 and the signal outputting period T6 are in the light emitting period), the signal on the first scanning line S1 is at a high level, the signals on the fourth scanning line S4, the second scanning line S2, the third scanning line S3 and the light emitting control signal line EM are at a low level, the second transistor T2, the third transistor T3, the fourth transistor T4 and the fifth transistor T5 are turned off, the sixth transistor T6 and the seventh transistor T7 are turned on, and the first transistor T1 generates a driving current according to the gate voltage thereof and the voltage supplied by the first power supply Vdd, so as to drive the light emitting device 14 to emit light.

In the signal generation phase t5, the signal on the emission control signal line EM is at a low level, the signal on the signal output control line Select is at a low level, and both the reset transistor Tr and the output transistor Tf are turned off. The light emitting device 14 is used for providing illumination for the photosensitive device 23, the fingerprints include valleys and ridges, and the reflection conditions of different fingerprints to light are different, so that the intensity of illumination received by the photosensitive device 23 is different, and further, the charge conditions accumulated at the first end of the photosensitive device 23 are different. In the signal generation phase t5, the signal on the second time-division control signal line TD jumps from the high level to the low level, and the second time-division control transistor M2 is turned from on to off. When the signal on the first time-division control signal line TRO changes from low level to high level, the first time-division control transistor M1 changes from off to on.

And in a signal output stage t6, the signal on the light-emitting control signal line EM and the signal on the second time-sharing control signal line TD are at a low level, the signal on the signal output control line Select and the signal on the first time-sharing control signal line TRO are at a high level, the reset transistor Tr and the second time-sharing control transistor M2 are turned off, the output transistor Tf and the first time-sharing control transistor M1 are turned on, the signal reading transistor Ts generates different fingerprint detection signals according to different voltages of the grid electrode of the signal reading transistor Ts, and the fingerprint detection signals are output through the turned-on output transistor Tf and the turned-on data line, so that fingerprint detection is completed.

It is worth noting that when the fingerprint detection circuit and the pixel circuit share a data line, the fingerprint detection signal can be output in a time period after the data voltage is written into the pixel circuits of all rows of the current frame of the pixel circuit and before the data voltage of the next frame is written into the pixel circuits, so that the time-sharing multiplexing of the data line is realized, namely, the data voltage is written into the data line Vdata, and the fingerprint detection signal is output through the data line Vdata.

In the timing sequences shown in fig. 5, 7, 19, 21, 23, 25 and 42, the signal output stage t6 overlaps with the light emitting stage t3, and the signal generation stage t5 and the signal output stage t6 are both located in the light emitting stage t3, and the generation of the fingerprint detection signal depends on the light emitted by the pixel circuit, so that the display panel to which the timing sequence is applied generates the fingerprint detection signal of the current frame in the light emitting stage, and then outputs the fingerprint detection signal in the light emitting stage. In fig. 29, 33 and 39, there is no overlap between the signal output phase t6 and the light emitting phase t3, i.e. the signal output phase t6 is located in the non-light emitting phase, the signal generating phase t5 is located in the light emitting phase t3 of the first frame t01 of the pixel circuit, i.e. the fingerprint detection circuit is generating the fingerprint detection signal in the whole light emitting phase t3 of the first frame, and the generated fingerprint detection signal is output in the second frame t02 of the pixel circuit.

In addition to the above-mentioned illustration, in other embodiments, the first electrode of the signal reading transistor is connected to a first power supply, the second terminal of the photosensitive device is connected to a second power supply, the first electrode of the reset transistor is connected to the first power supply, the gate of the output transistor is connected to the signal output control line, the gate of the reset transistor is connected to the reset control signal line, and the second electrode of the output transistor is connected to the signal reading line. Or the first pole of the signal reading transistor is connected with a first power supply, the second end of the photosensitive device is connected with a second power supply, the first pole of the reset transistor is connected with the light-emitting control signal line, the grid of the output transistor is connected with the signal output control line, the grid of the reset transistor is connected with the reset control signal line, and the second pole of the output transistor is connected with the data line. Or the first pole of the signal reading transistor is connected with the first power supply, the second end of the photosensitive device is connected with the second power supply, the first pole of the reset transistor is connected with the light-emitting control signal line, the grid of the output transistor is connected with the signal output control line, the grid of the reset transistor is connected with the first scanning line, and the second pole of the output transistor is connected with the data line. Or the first pole of the signal reading transistor is connected with the first power supply, the second end of the photosensitive device is connected with the second power supply, the first pole of the reset transistor is connected with the light-emitting control signal line, the grid of the output transistor is connected with the first scanning line, the grid of the reset transistor is connected with the reset control signal line, and the second pole of the output transistor is connected with the data line.

In this embodiment, the second terminal of the light sensing device may multiplex the first power supply or the second power supply or the light emission control signal line or the initialization signal line, the first pole (the input end of the fingerprint detection circuit) of the reset transistor may multiplex the initialization signal line or the light emission control signal line, the gate (the reset control end) of the reset transistor may multiplex the first scan line or the second scan line or the third scan line or the fourth scan line, the first pole of the signal acquisition transistor may multiplex the first power supply and the light emission control signal line, the gate of the output transistor may multiplex the first scan line or the second scan line or the third scan line or the fourth scan line, and the second pole (the signal output end) of the output transistor may multiplex the data line. The fingerprint detection circuit can select at least one of the ports to be multiplexed with the signal lines of the pixel circuit, so that the number and the types of the signal lines are reduced, and the structure of the display panel is simplified. It should be noted that the foregoing embodiments only illustrate several port multiplexing cases, the present invention is not limited to these, and other port multiplexing combinations are also covered by the scope of the present invention. The pixel circuit according to the embodiment of the present invention can be arbitrarily combined with the fingerprint detection circuit shown in fig. 10 to 15, which is not specifically limited in this embodiment.

Fig. 43 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 43, a display device 5 includes the display panel 6 according to any one of the embodiments. The display device 5 may be a mobile phone shown in fig. 43, and may also be a computer, a television, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment of the present invention.

The display device has the same beneficial effects as the display panel, and the description of the embodiment is omitted.

The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, comprising: the fingerprint detection circuit comprises a pixel circuit and a fingerprint detection circuit, wherein the pixel circuit comprises a light-emitting device;

2. The display panel according to claim 1, wherein the fingerprint detection circuit further comprises a reset module and a signal output module, the reset module is configured to reset the photosensitive device and the signal output module based on signals from the reset signal control terminal and the reset signal input terminal, and the signal output module is configured to generate and output the fingerprint detection signal based on the signals from the reset signal control terminal, the reset signal input terminal, the power supply terminal, and a photosensitive state of the photosensitive device;

3. The display panel according to claim 2, wherein the pixel circuit further includes a light emission control module and a compensation module, the scan line further includes a light emission control signal line and a fourth scan line, the light emission control module is connected to the light emission control signal line, and the light emission control module, the driving module, and the light emitting device are connected between the first power supply and the second power supply;

the compensation module is connected with the fourth scanning line, the compensation module is connected between the first end and the control end of the driving module, and the compensation module is used for performing threshold compensation on the driving module based on a signal on the fourth scanning line;

preferably, a first end of the photosensitive device is connected with the reset module, and a second end of the photosensitive device is connected with the light-emitting control signal line.

4. The display panel according to claim 3, wherein the reset module comprises a reset transistor, a first pole of the reset transistor is used as the reset signal input terminal, a second pole of the reset transistor is respectively connected with the signal output module and the photosensitive device, a gate of the reset transistor is used as the reset signal control terminal, and a first pole of the reset transistor is connected with the initialization signal line or the first power supply;

preferably, a gate of the reset transistor is connected to the first scan line, the second scan line, the third scan line, the fourth scan line, or the light emission control signal line.

5. The display panel according to claim 3, wherein the reset module comprises a reset transistor, a first pole of the reset transistor is used as the reset signal input terminal, a second pole of the reset transistor is respectively connected with the signal output module and the photosensitive device, a gate of the reset transistor is used as the reset signal control terminal, and a first pole of the reset transistor is connected with the light emission control signal line;

preferably, a gate of the reset transistor is connected to the first scan line, the second scan line, the third scan line, or the fourth scan line.

6. The display panel according to claim 2, wherein a first terminal of the light sensing device is connected to the reset module, and a second terminal of the light sensing device is connected to the first power supply, the second power supply, or the initialization signal line.

7. The display panel according to claim 2, wherein the signal output module includes a signal acquisition transistor and an output transistor, a first pole of the signal acquisition transistor being the power supply terminal, a second pole of the signal acquisition transistor being connected to a first pole of the output transistor, a gate of the signal acquisition transistor being connected to the reset module, a gate of the output transistor being connected to the output control signal line or the first scan line or the second scan line or the third scan line, a second pole of the output transistor being the signal output terminal;

preferably, a first pole of the signal acquisition transistor is connected to the first power supply.

8. The display panel according to claim 3, wherein the signal output module includes a signal acquisition transistor and an output transistor, a first pole of the signal acquisition transistor being the power supply terminal, a second pole of the signal acquisition transistor being connected to a first pole of the output transistor, a gate of the signal acquisition transistor being connected to the reset module, and a gate of the output transistor being connected to the fourth scan line;

preferably, the first electrode of the signal acquisition transistor is connected to the emission control signal line.

9. The display panel according to claim 7, wherein a second pole of the output transistor is connected to the data line, and the display panel further comprises a time-division control circuit configured to supply a data voltage to the data line and read the fingerprint detection signal in a time-division manner based on a first time-division control signal and a second time-division control signal.

10. The display panel according to claim 9, wherein the time-sharing control circuit comprises: the fingerprint detection circuit comprises a first time-sharing control transistor and a second time-sharing control transistor, wherein a first pole of the first time-sharing control transistor is connected with a second pole of the output transistor, the second pole of the first time-sharing control transistor is connected with a fingerprint driving chip, a grid electrode of the first time-sharing control transistor is connected with a first time-sharing control signal line, and the first time-sharing control signal line is used for providing a first time-sharing control signal;

11. A display device characterized by comprising the display panel according to any one of claims 1 to 10.