CN110989870A - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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- CN110989870A CN110989870A CN201911316439.4A CN201911316439A CN110989870A CN 110989870 A CN110989870 A CN 110989870A CN 201911316439 A CN201911316439 A CN 201911316439A CN 110989870 A CN110989870 A CN 110989870A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/96—Management of image or video recognition tasks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
Abstract
The invention discloses a display panel, a driving method thereof and a display device, and relates to the technical field of display, wherein the driving method of the display panel comprises a fingerprint identification stage, a display stage and a touch stage; the fingerprint identification stage comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in the same driving period, the display phase is executed between the reset phase and the data reading phase, and the touch phase is executed before the reset phase, or the touch phase is executed after the data reading phase. Therefore, in the same driving period, the touch control stage and the fingerprint identification stage are executed in a time-sharing mode, so that the influence of signals in the touch control stage on the signals in the fingerprint identification period is effectively avoided, and the fingerprint identification accuracy is favorably improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, a driving method thereof, and a display device.
Background
From the CRT (Cathode Ray Tube) era to the liquid crystal era and now to the OLED (Organic Light-Emitting Diode) era, the display industry has been developing over decades. The display industry is closely related to our lives, and display technologies cannot be separated from traditional mobile phones, flat panels, televisions and PCs, to current intelligent wearable devices and VRs.
In order to meet the use requirements of people on display devices, fingerprint identification functions and touch control functions are widely applied to the display devices. Fingerprints are inherent to everyone, and with the development of science and technology, a variety of display devices with fingerprint identification functions, such as mobile phones, tablet computers, intelligent wearable devices and the like, appear in the market. Before a user operates the display device with the fingerprint identification function, the user only needs to touch the display device with a finger to verify the authority, so that the authority verification process is simplified, and along with the gradual increase of application scenes of the fingerprint identification function, the fingerprint identification area gradually evolves from a partial area to full-screen identification.
When the fingerprint identification function and the touch function are simultaneously introduced into the display device, the electric signal in the touch process easily influences the electric signal in the fingerprint identification process, so that the precision of fingerprint identification is greatly reduced.
Disclosure of Invention
In view of this, the present invention provides a display panel, a driving method thereof and a display device, in which a touch stage and a fingerprint identification stage are executed in a time-sharing manner in a same driving cycle, so as to effectively avoid an influence of a signal in the touch stage on a signal during the fingerprint identification, thereby facilitating to improve the accuracy of the fingerprint identification.
In a first aspect, the present application provides a driving method of a display panel, where the driving method of the display panel includes a fingerprint identification stage, a display stage, and a touch stage;
the fingerprint identification stage comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in the same driving cycle, the display phase is executed between the reset phase and the data reading phase, and the touch phase is executed before the reset phase, or the touch phase is executed after the data reading phase.
In a second aspect, the present application provides a display panel comprising:
the photoelectric conversion device comprises a plurality of photodiodes which are arranged along a first direction and a second direction, wherein a first pole of each photodiode is connected with a reference potential terminal, and the first direction and the second direction are crossed;
the array substrate comprises a substrate base plate and an array layer positioned on one side of the substrate base plate;
the first electrode layer is positioned on one side of the array layer, which is far away from the substrate base plate, and the reference potential end is electrically connected with the first electrode layer; in the display stage, the first electrode layer is multiplexed into a common electrode layer and receives a common voltage signal; in the touch control stage, the first electrode layer is reused as a touch control electrode to receive a touch control detection signal;
the fingerprint identification stage of the display panel comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in the same driving cycle, the display phase is executed between the reset phase and the data reading phase, and the touch phase is executed before the reset phase, or the touch phase is executed after the data reading phase.
In a third aspect, the present application further provides a display device including the display panel provided in the present application.
Compared with the prior art, the display panel, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
in the display panel, the driving method thereof and the display device provided by the invention, the driving method comprises a fingerprint identification stage, a display stage and a touch control stage, wherein the fingerprint identification stage comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in particular, in the same driving cycle, the touch phase is executed before the reset phase in the fingerprint identification phase, or the touch phase is executed after the data reading phase in the fingerprint identification phase. Therefore, the touch control stage and the fingerprint identification stage are executed in a time-sharing mode, the influence of signals in the touch control stage on the signals in the fingerprint identification period is effectively avoided, and the fingerprint identification precision is improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram illustrating two adjacent driving periods in a driving method of a display panel according to an embodiment of the present disclosure;
fig. 2 is another schematic diagram illustrating two adjacent driving periods in a driving method of a display panel according to an embodiment of the present application;
fig. 3 is another schematic diagram illustrating two adjacent driving periods in a driving method of a display panel according to an embodiment of the present application;
fig. 4 is another schematic diagram illustrating two adjacent driving periods in a driving method of a display panel according to an embodiment of the present application;
fig. 5 is a top view of a display panel according to an embodiment of the present application;
FIG. 6 is an AA' cross-sectional view of the display panel of FIG. 5;
FIG. 7 is a circuit diagram of a fingerprint identification circuit according to an embodiment of the present application;
fig. 8 is a flowchart illustrating a fingerprint identification method in a driving method of a display panel according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram illustrating an arrangement of photodiodes in a display panel according to an embodiment of the present disclosure;
fig. 10 is a timing diagram illustrating a driving method of a display panel according to an embodiment of the present disclosure;
fig. 11 is a structural diagram of a display device according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the prior art, a fingerprint identification unit is introduced into a display device, so that the display device has a fingerprint identification function; the touch electrode is introduced into the display device, so that the display device has a touch function. Generally, a fingerprint recognition unit includes a selection switch and a light sensing device for sensing the intensity of light, which has a poor noise immunity although it has a simple structure. Especially, after the fingerprint identification element is integrated in the display device, the electric signal in the touch process is easy to interfere with the electric signal of the fingerprint identification unit, so that the fingerprint identification precision is greatly reduced.
In view of this, the present invention provides a display panel, a driving method thereof and a display device, in which a touch stage and a fingerprint identification stage are executed in a time-sharing manner in a same driving cycle, so as to effectively avoid an influence of a signal in the touch stage on a signal during the fingerprint identification, thereby facilitating to improve the accuracy of the fingerprint identification.
Fig. 1 is a schematic view illustrating two adjacent driving cycles in a driving method of a display panel provided in an embodiment of the present application, and fig. 2 is another schematic view illustrating two adjacent driving cycles in the driving method of the display panel provided in the embodiment of the present application, please refer to fig. 1 and fig. 2, in the driving method of the display panel provided in the embodiment of the present application, the driving method includes a fingerprint identification phase T2, a display phase T3 and a touch phase T1;
the fingerprint identification phase T2 includes a reset phase T21, an exposure phase T22 and a data reading phase T23 which are sequentially executed; in the same driving period T, the display phase T3 is performed between the reset phase T21 and the data reading phase T23, the touch phase T1 is performed before the reset phase T21, or the touch phase T1 is performed after the data reading phase T23.
Specifically, in the driving method of the display panel provided in the embodiment of the present application, the fingerprint identification phase T2 includes a reset phase T21, an exposure phase T22 and a data reading phase T23 that are sequentially executed, and fig. 1 shows a driving timing of the reset phase T21, the exposure phase T22 and the data reading phase T23 with the display phase T3 and the touch phase T1, in fig. 1, in the same driving period T, the touch phase T1 is first executed, then the reset phase T21 in the fingerprint identification phase T2 is executed, and the display phase T3 and the exposure phase T22 are located between the reset phase T21 and the data reading phase T23. Therefore, in the same driving period T, the touch control stage T1 is completed before the fingerprint identification stage T2 is carried out, namely, the fingerprint identification stage T2 and the touch control stage T1 are executed in a time-sharing mode in the same driving period T, the two stages are not overlapped, and the influence of an electric signal generated by the touch control stage T1 cannot be caused in the fingerprint identification process, so that the signal interference of a fingerprint identification circuit in a display panel when the fingerprint identification is carried out is reduced, the fingerprint identification precision is favorably improved, and the use experience effect of a user is favorably improved.
Similarly, fig. 2 shows another driving sequence of the reset phase T21, the exposure phase T22 and the data reading phase T23 in the fingerprint identification phase T2 and the display phase T3 and the touch phase T1, in fig. 2, in the same driving cycle T, the reset phase T21 in the fingerprint identification phase T2 is executed first, then the display phase T3 and the exposure phase T22 are executed, then the data reading phase T23 is executed, and after the data reading phase T23 is executed, the touch phase T1 is entered. So, in same drive cycle T, touch-control stage T1 is just started after fingerprint identification stage T2 execution is accomplished, that is to say, at fingerprint identification stage T2, the fingerprint identification process can not receive the influence of the signal of telecommunication that touch-control stage T1 produced, consequently be favorable to reducing the signal interference that fingerprint identification circuit received when carrying out fingerprint identification in the display panel, be favorable to promoting the fingerprint identification precision of display panel equally, and then be favorable to promoting user's use experience effect equally.
In the embodiment shown in fig. 1 and 2, the display phase T3 and the exposure phase T22 between the reset phase T21 and the data reading phase T23 may not overlap, for example, the display phase T3 may be performed first, and then the exposure phase T22 may be performed; or the exposure phase T22 is performed first, and then the display phase T3 is performed.
In an alternative embodiment of the present invention, referring to fig. 3, fig. 3 is another schematic diagram of two adjacent driving periods T in the driving method of the display panel provided in the embodiment of the present application, in which the exposure period T22 and the display period T3 at least partially overlap in the same driving period T.
In particular, with continued reference to fig. 3, during the same driving period T, the display period T3 and the exposure period T22 at least partially overlap, and display and exposure are performed simultaneously during the overlapping time period, which is beneficial to reducing the time occupied by one driving period T, and thus beneficial to improving the overall use sensitivity of the display panel.
In an alternative embodiment of the present invention, referring to fig. 4, fig. 4 is another schematic diagram of two adjacent driving periods T in the driving method of the display panel provided in the embodiment of the present application, in which the exposure period T22 and the display period T3 are completely overlapped in the same driving period T.
In particular, with continued reference to fig. 4, in the same driving period T, the display period T3 and the exposure period T22 completely coincide, that is, while displaying, the fingerprint identification unit is exposed, which is beneficial to increase the exposure time of the fingerprint identification unit, so that the fingerprint identification unit is fully exposed in the display period T3 of the display panel, and fully receives the light reflected by the touch subject, and can convert more light signals into electrical signals, thereby being beneficial to enhancing the signal intensity in the fingerprint identification process and improving the sensitivity of the fingerprint identification.
In an alternative embodiment of the present invention, fig. 5 is a top view of the display panel 100 provided in the embodiment of the present application, fig. 6 is an AA' cross-sectional view of the display panel 100 in fig. 5, and it should be noted that the cross-sectional view in fig. 6 is a cross-sectional view of the fingerprint identification area 11 on the display panel 100, in which the photodiode 30 is disposed; fig. 7 is a circuit diagram of a fingerprint identification circuit in an embodiment of the present application, and referring to fig. 1 to 7, a display panel 100 includes a photodiode 30, a reference potential terminal Vbias electrically connected to a first pole of the photodiode 30, and a first electrode layer 41, wherein the reference potential terminal Vbias is further electrically connected to the first electrode layer 41;
in the display period T3 and the exposure period T22, the first electrode layer 41 is multiplexed as a common electrode layer, receives a common voltage signal, and transmits the common voltage signal to the reference potential terminal Vbias.
Specifically, with continued reference to fig. 5 to 7, the present embodiment provides a display panel 100 in which the photodiode 30 serves as a light sensing device in the fingerprint recognition unit for receiving an optical signal fed back via the touch subject and converting the optical signal into an electrical signal, and a first pole of the photodiode 30 is connected to a reference potential terminal Vbias for receiving a constant voltage signal. The present application connects the reference potential terminal Vbias to the first electrode layer 41, and in the display period T3 and the exposure period T22, the first electrode layer 41 is multiplexed as a common electrode layer, receives a common voltage signal for display, the common voltage signal is a constant voltage signal, and when the reference potential terminal Vbias in the fingerprint identification unit is electrically connected to the first electrode layer 41, when the first electrode is multiplexed as a common electrode layer, a constant common voltage signal can be transmitted to the reference potential terminal Vbias, with the common voltage as a reference potential, therefore, even if the fingerprint identification unit is introduced into the display panel 100, it is not necessary to add a new film structure for the reference potential terminal Vbias in the fingerprint identification unit separately, multiplex the existing first electrode layer 41 on the display panel 100, therefore, the fingerprint recognition function is realized, and the film structure of the display panel 100 is simplified, so that the demand of thinning the display panel 100 is met.
In an alternative embodiment of the invention, please refer to fig. 1-7, in the touch stage T1, the first electrode layer 41 is reused as a touch electrode layer to receive a touch detection signal.
Specifically, the present application multiplexes the first electrode layer 41 into a common voltage layer, receives a common voltage signal, and electrically connects the reference potential terminal Vbias with the first electrode layer 41 in the exposure phase T22 in the display phase T3 and the fingerprint identification phase T2; in the touch stage T1, the first electrode layer 41 is reused as a touch electrode layer to receive a touch detection signal; that is to say, the first electrode layer 41 is used to receive different signals at different stages, and the film structure in the display panel 100 is fully utilized, and it is not necessary to separately set an independent film structure for the common voltage layer, the touch electrode layer, and the reference potential terminal Vbias, which is more beneficial to simplifying the film structure on the display panel 100 and more beneficial to realizing the requirement of thinning the display panel 100.
In an alternative embodiment of the present invention, please refer to fig. 4, 7-8, fig. 8 is a flowchart illustrating a fingerprint identification method in a driving method of a display panel according to an embodiment of the present application, where the driving method of the display panel further includes:
102, in an exposure period T22, the photodiode 30 collects an optical signal reflected by the touch subject and converts the optical signal into an electrical fingerprint signal;
Specifically, fig. 8 shows a flowchart of a fingerprint identification method in a driving method of the display panel 100 according to an embodiment of the present application, please refer to fig. 4, 7-8, where the reset phase T21 is equivalent to resetting the second polarity signal of the photodiode 30 to the first voltage signal, i.e. initializing the photodiode 30; after the resetting is completed, the photodiode 30 enters an exposure stage T22, and when a touch subject touches the display panel 100, the photodiode 30 collects an optical signal reflected by the touch subject and converts the optical signal into a fingerprint electrical signal; in the final data reading stage T23, the fingerprint electrical signal is transmitted to the output terminal Vout of the fingerprint identification circuit, and the fingerprint electrical signal is read by the fingerprint identification driving chip. Thus, a fingerprinting phase T2 is completed. It should be noted that, in the exposure period T22, when the touch subject does not touch the display panel 100, the photodiode 30 will not collect the light reflected by the touch subject, that is, the electrical signal on the photodiode 30 will not change, and the signal collected by the fingerprint identification driving chip is not different from the initial signal, so that it is determined that fingerprint identification has not occurred.
In an alternative embodiment of the present invention, referring to fig. 4 and 7, in the same driving period T, the duration of the exposure phase T22 is greater than the duration of the reset phase T21 and greater than the duration of the data reading phase T23.
Specifically, the duration of the exposure phase T22 in the fingerprint identification phase T2 is set to be greater than the duration of the reset phase T21 and greater than the duration of the data reading phase T23, which is favorable for increasing the exposure duration of the photodiode 30 in the fingerprint identification phase T2, so that the photodiode 30 can sufficiently receive the light reflected by the touch subject, and the amount of the light reflected by the touch subject, which can be received by the photodiode 30, is increased, thereby being favorable for increasing the intensity of the fingerprint signal, and being favorable for increasing the sensitivity of the fingerprint identification of the display panel 100.
Based on the same inventive concept, the present application further provides a display panel 100, please refer to fig. 5, 6, 7 and 9, including:
a plurality of photodiodes 30 arranged along a first direction and a second direction, please refer to fig. 9, a first pole of each of the photodiodes 30 is connected to a reference potential terminal Vbias, and the first direction and the second direction intersect, where fig. 9 is a schematic diagram of an arrangement of the photodiodes 30 in the display panel 100 according to the embodiment of the present application;
a substrate base plate 10 and an array layer 20 positioned at one side of the substrate base plate 10;
a first electrode layer 41 located on a side of the array layer 20 away from the substrate 10, wherein the reference potential terminal Vbias is electrically connected to the first electrode layer 41; in the display period T3, the first electrode layer 41 is multiplexed into a common electrode layer and receives a common voltage signal; at a touch stage T1, the first electrode layer 41 is reused as a touch electrode to receive a touch detection signal;
referring to fig. 1-2, the fingerprint recognition phase T2 of the display panel 100 includes a reset phase T21, an exposure phase T22 and a data reading phase T23 that are sequentially executed; within the same driving period T, the display phase T3 is performed between the reset phase T21 and the data reading phase T23, the touch phase T1 is performed before the reset phase T21, or the touch phase T1 is performed after the data reading phase T23.
Specifically, the photodiode 30 for identifying a fingerprint is introduced to the display panel 100, so that the display panel 100 has a fingerprint identification function at the same time as a display function. Referring to fig. 1, in the same driving cycle T, the touch stage T1 is first performed, and then the reset stage T21 of the fingerprint identification stage T2 is performed, and the display stage T3 and the exposure stage T22 are located between the reset stage T21 and the data reading stage T23. Therefore, in the same driving period T, the touch stage T1 is completed before the fingerprint identification stage T2 is performed, that is, the fingerprint identification stage T2 and the touch stage T1 are performed in the same driving period T in a time-sharing manner, and the two stages are not overlapped with each other and are not influenced by the electric signal generated by the touch stage T1 in the fingerprint identification process, so that the signal interference of the fingerprint identification circuit in the display panel 100 when the fingerprint identification is performed is reduced, thereby being beneficial to improving the precision of the fingerprint identification and further being beneficial to improving the use experience effect of a user.
Similarly, fig. 2 shows another driving sequence of the reset phase T21, the exposure phase T22 and the data reading phase T23 in the fingerprint identification phase T2 and the display phase T3 and the touch phase T1, in fig. 2, in the same driving cycle T, the reset phase T21 in the fingerprint identification phase T2 is executed first, then the display phase T3 and the exposure phase T22 are executed, then the data reading phase T23 is executed, and after the data reading phase T23 is executed, the touch phase T1 is entered. Therefore, in the same driving period T, the touch stage T1 is started after the fingerprint identification stage T2 is executed, that is, in the fingerprint identification stage T2, the fingerprint identification process is not affected by the electrical signal generated in the touch stage T1, so that the signal interference on the fingerprint identification circuit in the display panel 100 when the fingerprint identification is executed is reduced, the fingerprint identification precision of the display panel 100 is improved, and the use experience effect of the user is improved.
In addition, in the present application, the reference potential terminal Vbias is connected to the first electrode layer 41, in the display period T3 and the exposure period T22, the first electrode layer 41 is multiplexed as a common electrode layer, receives a display common voltage signal, which is a constant voltage signal, and when the reference potential terminal Vbias in the fingerprint identification unit is electrically connected to the first electrode layer 41, the constant common voltage signal can be transmitted to the reference potential terminal Vbias using the common voltage as a reference potential when the first electrode is multiplexed as a common electrode layer, so that even if the fingerprint identification unit is introduced into the display panel 100, there is no need to add a new film structure separately for the reference potential terminal Vbias in the fingerprint identification unit, and the first electrode layer 41 existing on the display panel 100 is multiplexed, thereby facilitating simplification of the film structure of the display panel 100 while realizing the fingerprint identification function, the demand for thinning of the display panel 100 is fulfilled.
In an alternative embodiment of the invention, the exposure phase T22 and the display phase T3 at least partially overlap during the same drive period T.
In particular, with continued reference to fig. 3, during the same driving period T, the display period T3 and the exposure period T22 at least partially overlap, and display and exposure are performed simultaneously during the overlapping time period, which is beneficial to reducing the time occupied by one driving period T, and thus beneficial to improving the overall use sensitivity of the display panel 100.
Optionally, in the same driving period T, the display period T3 and the exposure period T22 completely coincide, that is, while displaying, the fingerprint identification unit is exposed, which is beneficial to increase the exposure time of the fingerprint identification unit, so that the fingerprint identification unit is fully exposed in the display period T3 of the display panel 100, and fully receives the light reflected by the touch subject, and more light signals can be converted into electrical signals, thereby being beneficial to enhancing the signal strength in the fingerprint identification process and improving the sensitivity of fingerprint identification.
In an alternative embodiment of the present invention, referring to fig. 7, the display panel 100 further includes a fingerprint driving circuit, which includes the photodiode 30, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a first capacitor Cst;
a second pole of the photodiode 30 is electrically connected to a first pole of the first transistor T1, and a second pole of the first transistor T1, a first pole of the second transistor T2, and a first pole of the first capacitor Cst are electrically connected to a gate of the third transistor T3, respectively; a first pole of the third transistor T3 and a second pole of the second transistor T2 are electrically connected to a first voltage signal terminal VDD, respectively; a second pole of the third transistor T3 is electrically connected to a first pole of the fourth transistor T4, and a second pole of the fourth transistor T4 is electrically connected to the output terminal Vout of the fingerprint recognition driving circuit; the second pole of the first capacitor Cst is electrically connected to the reference potential terminal Vbias; the gate of the first transistor T1, the gate of the second transistor T2, and the gate of the fourth transistor T4 are connected to different control signal terminals, respectively.
Specifically, the operation of the fingerprint identification circuit will be described with reference to the circuit diagram shown in fig. 7 and the driving timing sequence shown in fig. 10, where fig. 10 is a timing diagram of the driving method of the display panel 100 according to the embodiment of the present application, where Rst represents the control signal received by the gate of the second transistor T2, Tx represents the control signal received by the gate of the first transistor T1, and SEL represents the control signal received by the gate of the fourth transistor T4. In the reset period T21, the second transistor T2 and the first transistor T1 are turned on, and the signal of the first voltage signal terminal VDD is reset to the first node N1; in the reset period T21, the first node N1 is simultaneously connected to the second pole of the photodiode 30 and the gate of the third transistor T3, that is, the potentials of the second pole of the photodiode 30 and the gate of the third transistor T3 are both VDD, so that the third transistor T3 is turned on. In the exposure period T22, the second transistor T2 maintains an on state, the first transistor T1 is turned off, the photodiode 30 collects light reflected by the touch subject, and when light reflected by the touch subject is collected, converts the optical signal into a fingerprint electric signal. In the data reading stage T23, the first transistor T1 and the fourth transistor T4 are turned on, the photodiode 30 converts the optical signal into an electrical signal, and stores the electrical signal into the first capacitor Cst, and the first capacitor Cst transmits the electrical signal to the output terminal Vout of the fingerprint identification circuit through the third transistor T3 and the fourth transistor T4, so that the fingerprint driving chip can collect a fingerprint signal through the output terminal Vout, thereby determining the ridge or valley of the touch main body, and further implementing the fingerprint identification function.
In addition, the touch main body in the present application may be embodied as a main body having a touch function, such as a palm, in addition to the finger, so that the palm print recognition function is realized.
Based on the same inventive concept, the present application further provides a display device 200, and fig. 11 is a structural diagram of the display device 200 provided in the embodiment of the present application, and referring to fig. 11, the display device 200 includes a display panel 100, and the display panel 100 is the display panel 100 provided in the embodiment of the present application. It should be noted that, for the embodiments of the display device 200 provided in the embodiments of the present application, reference may be made to the embodiments of the display panel 100, and repeated descriptions are omitted. The display device 200 provided by the present application may be: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In summary, the display panel, the driving method thereof and the display device provided by the invention at least achieve the following beneficial effects:
in the display panel, the driving method thereof and the display device provided by the invention, the driving method comprises a fingerprint identification stage, a display stage and a touch control stage, wherein the fingerprint identification stage comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in particular, in the same driving cycle, the touch phase is executed before the reset phase in the fingerprint identification phase, or the touch phase is executed after the data reading phase in the fingerprint identification phase. Therefore, the touch control stage and the fingerprint identification stage are executed in a time-sharing mode, the influence of signals in the touch control stage on the signals in the fingerprint identification period is effectively avoided, and the fingerprint identification precision is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. The driving method of the display panel is characterized by comprising a fingerprint identification stage, a display stage and a touch stage;
the fingerprint identification stage comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in the same driving cycle, the display phase is executed between the reset phase and the data reading phase, and the touch phase is executed before the reset phase, or the touch phase is executed after the data reading phase.
2. The method according to claim 1, wherein the exposure phase and the display phase at least partially overlap in the same driving period.
3. The method according to claim 2, wherein the exposure phase and the display phase completely coincide in the same driving period.
4. The method for driving a display panel according to claim 2, wherein the display panel comprises a photodiode, a reference potential terminal electrically connected to a first pole of the photodiode, and a first electrode layer, the reference potential terminal being further electrically connected to the first electrode layer;
in the display stage and the exposure stage, the first electrode layer is multiplexed into a common electrode layer, receives a common voltage signal, and transmits the common voltage signal to the reference potential terminal.
5. The method as claimed in claim 4, wherein the first electrode layer is reused as a touch electrode layer to receive a touch detection signal during the touch stage.
6. The method for driving a display panel according to claim 4, further comprising:
resetting a signal of a second polarity of the photodiode to a first voltage signal in the reset phase;
in an exposure stage, the photodiode collects an optical signal reflected by the touch main body and converts the optical signal into a fingerprint electrical signal;
in the data reading stage, the fingerprint electric signal is transmitted to the output end of the fingerprint identification circuit, and the fingerprint identification driving chip reads the fingerprint electric signal through the output end of the fingerprint identification circuit.
7. The method according to claim 1, wherein the duration of the exposure phase is longer than the duration of the reset phase and longer than the duration of the data read phase in the same driving period.
8. A display panel, comprising:
the photoelectric conversion device comprises a plurality of photodiodes which are arranged along a first direction and a second direction, wherein a first pole of each photodiode is connected with a reference potential terminal, and the first direction and the second direction are crossed;
the array substrate comprises a substrate base plate and an array layer positioned on one side of the substrate base plate;
the first electrode layer is positioned on one side of the array layer, which is far away from the substrate base plate, and the reference potential end is electrically connected with the first electrode layer; in the display stage, the first electrode layer is multiplexed into a common electrode layer and receives a common voltage signal; in the touch control stage, the first electrode layer is reused as a touch control electrode to receive a touch control detection signal;
the fingerprint identification stage of the display panel comprises a reset stage, an exposure stage and a data reading stage which are sequentially executed; in the same driving cycle, the display phase is executed between the reset phase and the data reading phase, and the touch phase is executed before the reset phase, or the touch phase is executed after the data reading phase.
9. A display panel as claimed in claim 8 characterized in that the exposure phase and the display phase at least partly overlap during the same drive period.
10. The display panel according to claim 9, further comprising a fingerprint driving circuit including the photodiode, a first transistor, a second transistor, a third transistor, a fourth transistor, and a first capacitor;
a second pole of the photodiode is electrically connected to a first pole of the first transistor, and the second pole of the first transistor, the first pole of the second transistor, and the first pole of the first capacitor are electrically connected to a gate of the third transistor, respectively; a first pole of the third transistor and a second pole of the second transistor are respectively electrically connected with a first voltage signal end; a second pole of the third transistor is electrically connected with a first pole of the fourth transistor, and a second pole of the fourth transistor is electrically connected with an output end of the fingerprint identification driving circuit; the second pole of the first capacitor is electrically connected with the reference potential end; the grid electrode of the first transistor, the grid electrode of the second transistor and the grid electrode of the fourth transistor are respectively connected to different control signal ends.
11. A display device characterized by comprising the display panel according to any one of claims 8 to 10.
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