CN109241940B - Display panel, fingerprint identification driving method thereof and display device - Google Patents
Display panel, fingerprint identification driving method thereof and display deviceDownload PDFInfo
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- CN109241940B CN109241940BCN201811137674.0ACN201811137674ACN109241940BCN 109241940 BCN109241940 BCN 109241940BCN 201811137674 ACN201811137674 ACN 201811137674ACN 109241940 BCN109241940 BCN 109241940B
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- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel, a fingerprint identification driving method thereof and a display device.
[ background of the invention ]
To the display panel who has the fingerprint identification function, for the comprehensive screen design of better realization, avoid the fingerprint identification area to occupy the space in non-display area, can adopt fingerprint technique under the screen at present to set up whole display area into the fingerprint identification area, promptly, correspond in the whole display area and be provided with a plurality of fingerprint identification units.
For the full-screen fingerprint identification display panel, in order to provide the fingerprint identification unit with sufficient detection time to improve the fingerprint identification accuracy, the scanning time of the fingerprint identification unit is not too short, so that the scanning period of the fingerprint identification is too long, and the detection performance is affected.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a display panel, a fingerprint identification driving method thereof, and a display device, which can shorten a duration of a scanning period during fingerprint identification and improve detection accuracy of fingerprint identification.
In one aspect, an embodiment of the present invention provides a display panel, where the display panel includes:
the touch control electrode is used for detecting the touch position of the touch main body on the display panel;
the fingerprint identification device comprises a plurality of fingerprint identification areas, a plurality of fingerprint identification units and a control unit, wherein each fingerprint identification area is internally provided with a plurality of fingerprint identification units;
the scanning driving unit is electrically connected with the fingerprint identification unit;
the control unit is used for controlling the scanning driving unit to scan the fingerprint identification unit in a first fingerprint identification area according to the touch position so as to enable the fingerprint identification unit in the first fingerprint identification area to carry out fingerprint identification;
the first fingerprint identification area is a fingerprint identification area where the touch position is located, and the scanning time of the scanning driving unit to the fingerprint identification unit in the first fingerprint identification area is longer than the scanning time to the fingerprint identification units in other fingerprint identification areas.
On the other hand, an embodiment of the present invention provides a fingerprint identification driving method, where the fingerprint identification driving method is applied to the display panel, and the fingerprint identification driving method includes:
the touch electrode detects the touch position of the touch main body on the display panel;
the control unit controls the scanning driving unit to scan the fingerprint identification unit in the first fingerprint identification area according to the touch position, so that the fingerprint identification unit in the first fingerprint identification area carries out fingerprint identification;
the first fingerprint identification area is a fingerprint identification area where the touch position is located, and the scanning time of the scanning driving unit to the fingerprint identification unit in the first fingerprint identification area is longer than the scanning time to the fingerprint identification units in other fingerprint identification areas.
In another aspect, an embodiment of the present invention provides a display device, which includes the above display panel.
One of the above technical solutions has the following beneficial effects:
the display panel provided by the embodiment of the invention divides the whole identification area into a plurality of fingerprint identification areas, and when fingerprint identification is carried out, firstly, the touch position of the touch main body is detected through the touch electrode based on the working principle of the touch electrode, and then, the first fingerprint identification area where the touch position is located is scanned in a targeted manner. For the fingerprint identification area at the non-touch position, the scanning time can be reduced or the fingerprint identification area is not scanned, so that the duration of the whole scanning period is reduced, the scanning times are increased in unit time, and the identification precision is improved. On the other hand, because the display panel can reduce the duration of the scanning period, the display panel can also improve the scanning time of the fingerprint identification unit in the first fingerprint identification area to a certain extent, thereby improving the detection precision of the fingerprint identification unit in the area and improving the accuracy of fingerprint identification.
Therefore, by adopting the technical scheme provided by the embodiment of the invention, the time length of the whole scanning period can be reduced, the detection precision of the fingerprint identification unit in the first fingerprint identification area can be improved to a certain extent, and the accuracy of fingerprint identification is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 diagram of a display panel in the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic view of another structure of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a scan module according to an embodiment of the present invention;
FIG. 5 is a signal timing diagram of a scan module according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another structure of a display panel according to an embodiment of the present invention;
FIG. 7 is a signal timing diagram of a scan driving unit according to an embodiment of the present invention;
FIG. 8 is a flow chart of a fingerprint identification driving method provided by an embodiment of the invention;
FIG. 9 is another flow chart of a fingerprint identification driving method provided by an embodiment of the present invention;
FIG. 10 is a flowchart of a fingerprint identification driving method according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first and second may be used to describe the matching modules in embodiments of the present invention, the matching modules should not be limited to these terms. These terms are only used to distinguish matching modules from each other. For example, a first matching module may also be referred to as a second matching module, and similarly, a second matching module may also be referred to as a first matching module, without departing from the scope of embodiments of the present invention.
Before explaining the technical scheme provided by the embodiment of the invention, the embodiment of the invention firstly explains the principle of light-sensitive fingerprint identification in detail:
as shown in fig. 1, fig. 1 is a schematic structural diagram of a display panel in the prior art, a plurality of fingerprint identification units 2 'arranged in a matrix manner are arranged in a display area 1' of the display panel, and each fingerprint identification unit 2 'includes a PIN junction 3', a storage capacitor 4 'and a thin film transistor 5'. When a touch subject (e.g., a finger) touches the display panel, the scan driving unit 6 ' sequentially outputs scan signals, which are transmitted to the corresponding fingerprint recognition units 2 ' via the scan signal line S1 '. For the fingerprint identification unit 2 'at the touch position, when the fingerprint identification unit 2' receives a scanning signal, the thin film transistor 5 'is turned on under the action of the scanning signal, and the light reflected by the touch subject is irradiated onto the PIN junction 3' through one of the plates of the storage capacitor 4 ', so that the saturation reverse leakage current of the PIN junction 3' is greatly increased to form a photocurrent, and the photocurrent is transmitted out through the output signal line D1 'connected with the thin film transistor 5'. Because the distance from the ridge and the valley in the fingerprint to the PIN junction 3 ' is different, the intensity of the reflected light ray received by the PIN junction 3 ' and formed at the ridge position and the intensity of the reflected light ray formed at the valley position are different, so that the magnitude of the photocurrent converted by the PIN junction 3 ' is different, and the valley and the ridge of the fingerprint are identified according to the magnitude of the photocurrent.
In the prior art, in order to ensure the identification accuracy, the number of the fingerprint identification units 2 ' arranged in the display panel is large, and in order to give enough detection time to the fingerprint identification units 2 ', the time length of the scanning signal received by each row of fingerprint identification units 2 ' is not too short, which results in too long scanning period of fingerprint identification.
Based on this, an embodiment of the present invention provides a display panel, as shown in fig. 2, fig. 2 is a schematic structural diagram of the display panel provided in the embodiment of the present invention, and the display panel includes atouch electrode 1, a plurality offingerprint identification areas 2, a scan driving unit 3, and acontrol unit 4.
Thetouch electrode 1 is used for detecting a touch position of a touch subject on the display panel. Specifically, thetouch electrode 1 may include a touch sensing electrode and a touch driving electrode, a mutual capacitance is formed between the touch sensing electrode and the touch driving electrode, and when the touch main body touches the display panel, the mutual capacitance between the touch sensing electrode and the touch driving electrode at the touch position is changed, so as to detect the touch position according to a change amount of the mutual capacitance. The touch sensing electrodes and the touch driving electrodes can be arranged on the same layer or different layers, and the arrangement mode and the touch principle of the touch sensing electrodes and the touch driving electrodes are the same as those of the prior art, and are not repeated here.
Eachfingerprint identification area 2 is provided with a plurality of fingerprint identification units 5, and referring to fig. 1 again, each fingerprint identification unit 5 specifically includes a PIN junction, a storage capacitor, and a thin film transistor.
The scanning driving unit 3 is electrically connected with the fingerprint identification unit 5 and is used for providing scanning signals to the fingerprint identification unit 5.
Thecontrol unit 4 is used for controlling the scanning driving unit 3 to scan the fingerprint identification unit 5 in the firstfingerprint identification area 6 according to the touch position, so that the fingerprint identification unit 5 in the firstfingerprint identification area 6 performs fingerprint identification; the firstfingerprint identification area 6 is thefingerprint identification area 2 where the touch position is located, and the scanning time of the scanning driving unit 3 for the fingerprint identification units 5 in the firstfingerprint identification area 6 is longer than the scanning time for the fingerprint identification units 5 in otherfingerprint identification areas 2.
The display panel provided by the embodiment of the invention divides the whole identification area into a plurality offingerprint identification areas 2, and when fingerprint identification is carried out, firstly, the touch position of a touch main body is detected through thetouch electrode 1 based on the working principle of thetouch electrode 1, and then, the firstfingerprint identification area 6 where the touch position is located is scanned in a targeted manner. For thefingerprint identification area 2 at the non-touch position, the scanning time can be reduced or the fingerprint identification area is not scanned, so that the duration of the whole scanning period is reduced, the scanning times are increased in unit time, and the identification precision is improved. On the other hand, because the display panel can reduce the duration of the scanning period, the display panel can also improve the scanning time of the fingerprint identification unit 5 in the firstfingerprint identification area 6 to a certain extent, thereby improving the detection precision of the fingerprint identification unit 5 in the area and improving the accuracy of fingerprint identification.
Therefore, by adopting the display panel provided by the embodiment of the invention, the time length of the whole scanning period can be reduced, the detection precision of the fingerprint identification unit 5 in the firstfingerprint identification area 6 can be improved to a certain extent, and the accuracy of fingerprint identification is improved.
To improve the regularity of the arrangement of the fingerprint identification units 5 in the display panel and further improve the operability of driving the fingerprint identification units 5, as shown in fig. 3, fig. 3 is another schematic structural diagram of the display panel according to the embodiment of the present invention, a plurality offingerprint identification areas 2 are arranged in the column direction, eachfingerprint identification area 2 includes a plurality ofidentification unit groups 7, and eachidentification unit group 7 includes a plurality of fingerprint identification units 5 arranged in the row direction.
Optionally, referring to fig. 3 again, the scanning driving unit 3 includes a plurality of scanning modules 8 corresponding to the plurality offingerprint identification areas 2 one by one, each scanning module 8 includes a plurality of output terminals, and each output terminal is electrically connected to the fingerprint identification unit 5 of oneidentification unit group 7 in the correspondingfingerprint identification area 2.
Thecontrol unit 4 further comprises a first matching module 9 and aselection driving module 10, wherein the first matching module 9 is configured to obtain the position information of the firstfingerprint identification area 6 according to the touch position. The input end of theselection driving module 10 is electrically connected with the first matching module 9, theselection driving module 10 comprises a plurality of output ends, each output end is electrically connected with one scanning module 8, and theselection driving module 10 is used for outputting a driving signal to the scanning module 8 corresponding to the firstfingerprint identification area 6 according to the position information, so that the scanning module 8 scans the fingerprint identification unit 5 in the firstfingerprint identification area 6.
Specifically, as shown in fig. 4, fig. 4 is a schematic structural diagram of a scanning module according to an embodiment of the present invention, each scanning module 8 includes a plurality of cascadedshift register units 11, and oneshift register unit 11 is electrically connected to a plurality of fingerprint identification units 5 in oneidentification unit group 7.
Eachshift register cell 11 includes a shift input terminal IN, a shift output terminal NEXT, a first clock signal terminal CK1, a second clock signal terminal CK2, a RESET signal terminal RESET, and an output terminal OUT. The shift input terminal IN of the firstshift register unit 11 is electrically connected to theselection driving module 10 through the frame start signal line STV, IN two adjacentshift register units 11, the shift output terminal NEXT of the previousshift register unit 11 is connected to the shift input terminal IN of the NEXTshift register unit 11, and the output terminal OUT of eachshift register unit 11 is electrically connected to the plurality of fingerprint identification units 5 IN the correspondingidentification unit group 7. The first clock signal terminal CK1 of the oddshift register cells 11 is electrically connected to theselection driving module 10 through the first clock signal line CKH1, the second clock signal terminal CK2 is electrically connected to theselection driving module 10 through the second clock signal line CKH2, the first clock signal terminal CK1 of the evenshift register cells 11 is electrically connected to theselection driving module 10 through the second clock signal line CKH2, the second clock signal terminal CK2 is electrically connected to theselection driving module 10 through the first clock signal line CKH1, and the RESET signal terminals RESET of theshift register cells 11 are electrically connected to theselection driving module 10 through the RESET signal line RST.
Assuming that Nidentification unit groups 7 are disposed in eachfingerprint identification area 2, in the process of fingerprint identification, as shown in fig. 5, fig. 5 is a signal timing diagram corresponding to a scanning module provided in an embodiment of the present invention, and theselection driving module 10 outputs a driving signal stv to the scanning module 8 corresponding to the firstfingerprint identification area 6 according to the position information. During a 1 st period t1A first clock signal provided on a first clock signal line CKH1Under the action of chk1, the 1 stshift register cell 11 outputs scan signals scan1 to the fingerprint identification cells 5 of the 1 stidentification cell group 7, so that the fingerprint identification cells 5 perform fingerprint detection, and the shift output terminal NEXT of the 1 stshift register cell 11 outputs a shift control signal to the shift input terminal IN of the 2 ndshift register cell 11.
In the 2 nd period t2Under the action of the second clock signal chk2 provided from the second clock signal line CKH2, the 2 ndshift register cell 11 outputs a scan signal scan2 to the fingerprint identification cells 5 of the 2 ndidentification cell group 7 to make the fingerprint identification cells 5 perform fingerprint detection, and at the same time, the shift output terminal NEXT of the 2 ndshift register cell 11 outputs a shift control signal to the shift input terminal IN of the 3 rdshift register cell 11.
And so on, until the nthshift register unit 11 outputs the scan signal scan N to the fingerprint identification units 5 of the nthidentification unit group 7. Finally, the reset signal line RST supplies a reset signal RST to the Nshift register units 11, and controls the Nshift register units 11 to reset.
By enabling each fingerprint identification unit 5 to correspond to one independent scanning module 8 and enabling theselection driving module 10 to drive the plurality of scanning modules 8 independently, after the position of the firstfingerprint identification area 6 is determined, only the scanning module 8 corresponding to the firstfingerprint identification area 6 can be driven to output scanning signals, so that the fingerprint identification unit 5 in the area can perform fingerprint identification, and other scanning modules 8 are not driven. By adopting the setting mode, the fingerprint identification unit 5 at the touch position can be ensured to receive the scanning signal, the complete fingerprint can be detected, and the duration of the scanning period can be reduced to a great extent. Further, by increasing the scanning time period for the fingerprint recognition units 5 in the firstfingerprint recognition area 6, the detection accuracy can also be improved.
Alternatively, as shown in fig. 6, fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention, in which the scan driving unit 3 includes a plurality of output terminals, and each output terminal is electrically connected to the fingerprint identification unit 5 of oneidentification unit group 7.
Thecontrol unit 4 comprises asecond matching module 12 and a pulsewidth control module 13, wherein thesecond matching module 12 is configured to obtain the position information of the firstfingerprint identification area 6 according to the touch position. The pulsewidth control module 13 is electrically connected to thesecond matching module 12 and the scan driving unit 3, and the pulsewidth control module 13 is configured to output a pulse width control signal to the scan driving unit 3 according to the position information, so that the scanning duration of the scan driving unit 3 for eachrecognition unit group 7 in the firstfingerprint recognition area 6 is T1, the scanning duration for eachrecognition unit group 7 in the otherfingerprint recognition areas 2 is T2, and T1 > T2.
Specifically, referring to fig. 6 again, the scan driving unit 3 includes a plurality ofshift register units 11, the number of theshift register units 11 is equal to the total number of the fingerprint identification groups in the plurality offingerprint identification areas 2, and oneshift register unit 11 is electrically connected to the plurality of fingerprint identification units 5 in oneidentification unit group 7. The specific structure and connection manner of theshift register unit 11 are the same as those of theshift register unit 11 shown in fig. 4, and are not described herein again.
Assuming that the total number of fingerprint identification groups in the plurality offingerprint identification areas 2 is M, the fingerprint identification groups in the firstfingerprint identification area 6 correspond to the jth and kth of all fingerprint identification groups. As shown in fig. 7, fig. 7 is a signal timing diagram corresponding to the scan driving unit 3 according to the embodiment of the invention, and the pulsewidth control module 13 outputs a first pulse width control signal ckh1 'and a second pulse width control signal ckh 2' to the scan driving unit 3 according to the position information, wherein a pulse width T2 of a jth pulse and a kth pulse in the first pulse width control signal ckh1 'and the second pulse width control signal ckh 2' is greater than a pulse width T1 of other pulses.
During a 1 st period t1Time period t of j-1j-1The scan driving unit 3 sequentially provides scan signals to the 1 st to j-1 st finger print recognition groups, and under the action of the first pulse width control signal ckh1 'and the second pulse width control signal ckh 2', the time length for each of the 1 st to j-1 th finger print recognition groups to receive the scan signals is T1.
During the j-th period tjKth time period tkCleaning broomThe scanning driving unit 3 sequentially provides scanning signals to the jth to kth fingerprint identification groups, and under the action of the first pulse width control signal ckh1 'and the second pulse width control signal ckh 2', the time length for each of the jth to kth fingerprint identification groups to receive the scanning signals is T2, and T2 is more than T1.
During the (k + 1) th period tk+1Time period of MMThe scan driving unit 3 sequentially provides scan signals to the (k + 1) th to mth fingerprint identification groups, and under the action of the first pulse width control signal ckh1 'and the second pulse width control signal ckh 2', the time length for each of the (k + 1) th to mth fingerprint identification groups to receive the scan signals is T1.
By adopting the setting mode, the specific structure of the original scanning driving unit 3 is not required to be changed, and only the pulsewidth control module 13 is required to be arranged, so that the time length for receiving scanning signals in the firstfingerprint identification area 6 and otherfingerprint identification areas 2 is controlled by the pulsewidth control module 13, the scanning time length in otherfingerprint identification areas 2 is reduced, and the time length of the whole scanning period is further reduced. Moreover, with this arrangement, the detection accuracy can be improved by increasing the scanning time of the fingerprint identification unit 5 in the firstfingerprint identification area 6.
Optionally, the display panel is including being a plurality of pixel regions that the matrix was arranged, in order to increase the quantity of fingerprint identification unit 5, improves fingerprint identification's detection precision, can make every pixel region all correspond and set up a fingerprint identification unit 5.
Optionally, the pixel regions are arranged in m rows, and when each pixel region is correspondingly provided with one fingerprint identification unit 5, the row number of the pixel region corresponding to the fingerprint identification unit 5 in eachfingerprint identification region 2 is L, and L is greater than or equal to 150 and less than or equal to m. Generally speaking, most of touch subjects are fingers, and when the fingers touch the display panel, the width occupied by the fingerprint is close to the width of the 150 rows of pixel areas, so that eachfingerprint identification area 2 at least corresponds to the 150 rows of pixel areas, and the width of eachfingerprint identification area 2 can be ensured to be larger than the conventional width of the fingerprint of the finger, and thus, the fingerprint can be accurately identified only by the fingerprint identification unit 5 in onefingerprint identification area 2.
An embodiment of the present invention further provides a fingerprint identification driving method, where the fingerprint identification driving method is applied to the display panel, and with reference to fig. 2 and as shown in fig. 8, fig. 8 is a flowchart of the fingerprint identification driving method according to the embodiment of the present invention, and the fingerprint identification driving method includes:
step S1: thetouch electrode 1 detects a touch position of a touch subject on the display panel.
Step S2: thecontrol unit 4 controls the scanning driving unit 3 to scan the fingerprint identification unit 5 in the firstfingerprint identification area 6 according to the touch position, so that the fingerprint identification unit 5 in the firstfingerprint identification area 6 performs fingerprint identification; the firstfingerprint identification area 6 is thefingerprint identification area 2 where the touch position is located, and the scanning time of the scanning driving unit 3 for the fingerprint identification unit 5 in the firstfingerprint identification area 6 is longer than the scanning time for the fingerprint identification units 5 in otherfingerprint identification areas 2.
By adopting the fingerprint identification driving method provided by the embodiment of the invention, when fingerprint identification is carried out, firstly, the touch position of the touch main body is detected through thetouch electrode 1, and then, the firstfingerprint identification area 6 where the touch position is located is scanned in a targeted manner. For thefingerprint identification area 2 corresponding to the non-touch position, the scanning time can be reduced or the fingerprint identification area is not scanned, so that the duration of the whole scanning period is reduced, the scanning times are increased in unit time, and the identification precision is improved. On the other hand, because the driving method can reduce the duration of the scanning period, the driving method can also improve the scanning time of the fingerprint identification unit 5 in the firstfingerprint identification area 6 to a certain extent, thereby improving the detection precision of the fingerprint identification unit 5 in the area and improving the accuracy of fingerprint identification.
With reference to fig. 3, the plurality offingerprint identification areas 2 are arranged along the column direction, eachfingerprint identification area 2 includes a plurality ofidentification unit groups 7, eachidentification unit group 7 includes a plurality of fingerprint identification units 5 arranged along the row direction, the scanning driving unit 3 includes a plurality of scanning modules 8 corresponding to the plurality offingerprint identification areas 2 one by one, each scanning module 8 includes a plurality of output ends, and each output end is electrically connected to the fingerprint identification unit 5 of oneidentification unit group 7 in the correspondingfingerprint identification area 2; thecontrol unit 4 comprises a first matching module 9 and aselection driving module 10, wherein an input end of theselection driving module 10 is electrically connected with the first matching module 9, theselection driving module 10 comprises a plurality of output ends, and each output end is electrically connected with one scanning module 8.
At this time, as shown in fig. 9, fig. 9 is another flowchart of the fingerprint identification driving method according to the embodiment of the present invention, and step S2 may specifically include:
step S21: the first matching module 9 obtains the position information of the firstfingerprint identification area 6 according to the touch position.
Step S22: theselection driving module 10 outputs a driving signal to the scanning module 8 corresponding to the firstfingerprint identification area 6 according to the position information, so that the scanning module 8 scans the fingerprint identification unit 5 in the firstfingerprint identification area 6.
The specific working principle of theselection driving module 10 and the scanning module 8 has been described in detail in the above embodiments, and is not described herein again.
By adopting the driving mode, after the position of the firstfingerprint identification area 6 is determined, only the scanning module 8 corresponding to the firstfingerprint identification area 6 can be driven to output scanning signals, so that the fingerprint identification unit 5 in the area carries out fingerprint identification, and other scanning modules 8 are not driven. Therefore, the fingerprint identification unit 5 at the touch position can be ensured to receive the scanning signal, the complete fingerprint detection is realized, and the duration of the scanning period can be reduced to a great extent. Further, by increasing the scanning time period for the fingerprint recognition units 5 in the firstfingerprint recognition area 6, the detection accuracy can also be improved.
Referring to fig. 6, a plurality offingerprint identification areas 2 are arranged in a column direction, eachfingerprint identification area 2 includes a plurality ofidentification cell groups 7, and eachidentification cell group 7 includes a plurality of fingerprint identification cells 5 arranged in a row direction; the scanning driving unit 3 comprises a plurality of output ends, and each output end is electrically connected with a plurality of fingerprint identification units 5 of oneidentification unit group 7; thecontrol unit 4 includes asecond matching module 12 and a pulsewidth control module 13, wherein the pulsewidth control module 13 is electrically connected with thesecond matching module 12 and the scan driving unit 3.
At this time, as shown in fig. 10, fig. 10 is a flowchart of a fingerprint identification driving method according to an embodiment of the present invention, and step S2 may specifically include:
step S21': thesecond matching module 12 obtains the position information of the firstfingerprint identification area 6 according to the touch position.
Step S22': the pulsewidth control module 13 outputs a pulse width control signal to the scan driving unit 3 according to the position information, so that the scan driving unit 3 has a scanning time duration T1 for eachrecognition unit group 7 in the firstfingerprint recognition area 6 and a scanning time duration T2 for eachrecognition unit group 7 in the otherfingerprint recognition areas 2, where T1 > T2.
The specific working principle of the pulsewidth control module 13 and the scan driving unit 3 has been described in detail in the above embodiments, and is not described herein again.
By adopting the driving mode, the duration of receiving the scanning signals in the firstfingerprint identification area 6 and the otherfingerprint identification areas 2 is controlled through the pulsewidth control module 13, so that the scanning duration in the otherfingerprint identification areas 2 can be reduced, and further the duration of the whole scanning period is reduced. In addition, with this driving method, the detection accuracy can be improved by increasing the scanning time of the fingerprint identification unit 5 in the firstfingerprint identification area 6.
Optionally, in order to ensure that the fingerprint identification units 5 in the firstfingerprint identification area 6 have sufficient detection time and improve the accuracy of fingerprint identification detection, the scanning time T1 of the corresponding fingerprint identification unit 5 at the touch position may be satisfied: t1 is more than or equal to 50 mu s.
Optionally, in order to effectively reduce the duration of the scanning period, the scanning time T2 of the fingerprint identification unit 5 corresponding to the non-touch position may be satisfied: t2 is more than or equal to 5 mu s and less than or equal to 8 mu s.
As shown in fig. 11, fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the display device includes thedisplay panel 100. The specific structure of thedisplay panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 11 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Because the display device provided by the embodiment of the invention comprises thedisplay panel 100, the display device can reduce the time length of the whole scanning period, improve the detection precision of the fingerprint identification unit in the first fingerprint identification area to a certain extent and improve the accuracy of fingerprint identification.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A display panel, comprising:
the touch control electrode is used for detecting the touch position of the touch main body on the display panel;
the fingerprint identification device comprises a plurality of fingerprint identification areas, a plurality of fingerprint identification units and a control unit, wherein each fingerprint identification area is internally provided with a plurality of fingerprint identification units;
the control unit is used for controlling the scanning driving unit to scan the fingerprint identification unit in a first fingerprint identification area according to the touch position so as to enable the fingerprint identification unit in the first fingerprint identification area to carry out fingerprint identification;
the first fingerprint identification area is a fingerprint identification area where the touch position is located, and the scanning time of the scanning driving unit for the fingerprint identification units in the first fingerprint identification area is longer than the scanning time for the fingerprint identification units in other fingerprint identification areas;
the fingerprint identification areas are arranged along the column direction, each fingerprint identification area comprises a plurality of identification unit groups, and each identification unit group comprises a plurality of fingerprint identification units arranged along the row direction;
the scanning driving unit comprises a plurality of scanning modules which are in one-to-one correspondence with the plurality of fingerprint identification areas, each scanning module comprises a plurality of output ends, and each output end is electrically connected with the fingerprint identification unit of one identification unit group in the corresponding fingerprint identification area;
the control unit includes:
the first matching module is used for acquiring the position information of the first fingerprint identification area according to the touch position;
the input end of the selective driving module is electrically connected with the first matching module, the selective driving module comprises a plurality of output ends, each output end is electrically connected with one scanning module, and the selective driving module is used for outputting a driving signal to the scanning module corresponding to the first fingerprint identification area according to the position information so that the scanning module scans the fingerprint identification units in the first fingerprint identification area;
or,
the scanning driving unit comprises a plurality of output ends, and each output end is electrically connected with the fingerprint identification unit of one identification unit group;
the control unit includes:
the second matching module is used for acquiring the position information of the first fingerprint identification area according to the touch position;
the pulse width control module is electrically connected with the second matching module and the scanning driving unit, and is used for outputting a pulse width control signal to the scanning driving unit according to the position information, so that the scanning driving unit has a scanning time length of T1 for each identification unit group in the first fingerprint identification area, and has a scanning time length of T2 for each identification unit group in the other fingerprint identification areas, wherein T1 is greater than T2.
2. The display panel according to claim 1, wherein the display panel comprises a plurality of pixel regions arranged in a matrix, and each pixel region is provided with one fingerprint identification unit.
3. The display panel according to claim 2, wherein the pixel regions are arranged in m rows, and the row number of the pixel region corresponding to the fingerprint identification unit in each fingerprint identification region is L, L is greater than or equal to 150 and less than or equal to m.
4. A fingerprint recognition driving method applied to the display panel according to claim 1, the fingerprint recognition driving method comprising:
the touch electrode detects the touch position of the touch main body on the display panel;
the control unit controls the scanning driving unit to scan the fingerprint identification unit in the first fingerprint identification area according to the touch position, so that the fingerprint identification unit in the first fingerprint identification area carries out fingerprint identification;
the first fingerprint identification area is a fingerprint identification area where the touch position is located, and the scanning time of the scanning driving unit for the fingerprint identification unit in the first fingerprint identification area is longer than the scanning time of the fingerprint identification units in other fingerprint identification areas;
the fingerprint identification areas are arranged along the column direction, each fingerprint identification area comprises a plurality of identification unit groups, and each identification unit group comprises a plurality of fingerprint identification units arranged along the row direction;
the scanning driving unit comprises a plurality of scanning modules which are in one-to-one correspondence with the plurality of fingerprint identification areas, each scanning module comprises a plurality of output ends, and each output end is electrically connected with the fingerprint identification unit of one identification unit group in the corresponding fingerprint identification area; the control unit includes: a first matching module; the input end of the selective driving module is electrically connected with the first matching module, the selective driving module comprises a plurality of output ends, and each output end is electrically connected with one scanning module;
the controlling the scanning driving unit to scan the fingerprint identification unit in a first fingerprint identification area according to the touch position so that the fingerprint identification unit in the first fingerprint identification area performs fingerprint identification comprises:
the first matching module acquires the position information of the first fingerprint identification area according to the touch position;
the selection driving module outputs a driving signal to the scanning module corresponding to the first fingerprint identification area according to the position information, so that the scanning module scans the fingerprint identification units in the first fingerprint identification area;
or,
the scanning driving unit comprises a plurality of output ends, and each output end is electrically connected with a plurality of fingerprint identification units of one identification unit group; the control unit includes: a second matching module; the pulse width control module is electrically connected with the second matching module and the scanning driving unit;
the controlling the scanning driving unit to scan the fingerprint identification unit in a first fingerprint identification area according to the touch position so that the fingerprint identification unit in the first fingerprint identification area performs fingerprint identification comprises:
the second matching module acquires the position information of the first fingerprint identification area according to the touch position;
the pulse width control module outputs a pulse width control signal to the scanning driving unit according to the position information, so that the scanning driving unit has a scanning time length of T1 for each identification unit group in the first fingerprint identification area, and has a scanning time length of T2 for each identification unit group in other fingerprint identification areas, wherein T1 is greater than T2.
5. The fingerprint recognition driving method according to claim 4, wherein T1 is 50 μ s or more.
6. The fingerprint recognition driving method according to claim 4, wherein T2 is 5 μ s ≦ T2 ≦ 8 μ s.
7. A display device comprising the display panel according to any one of claims 1 to 3.
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| CN112418201B (en)* | 2019-08-22 | 2025-05-13 | 京东方科技集团股份有限公司 | Fingerprint recognition module, driving method thereof and display device |
| CN112464702B (en)* | 2019-09-06 | 2025-06-06 | 联咏科技股份有限公司 | Electronic device, chip, panel, decoder, and operating method |
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