CN115100962A - Display panel and display device - Google Patents
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- CN115100962A CN115100962A CN202210753450.2A CN202210753450A CN115100962A CN 115100962 A CN115100962 A CN 115100962A CN 202210753450 A CN202210753450 A CN 202210753450A CN 115100962 A CN115100962 A CN 115100962A
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- 239000002184 metal Substances 0.000 claims description 25
- 239000010408 film Substances 0.000 claims description 17
- 239000010409 thin film Substances 0.000 claims description 16
- 230000006698 induction Effects 0.000 claims description 13
- 238000005538 encapsulation Methods 0.000 claims description 12
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 169
- 238000010586 diagram Methods 0.000 description 22
- 238000001514 detection method Methods 0.000 description 20
- 230000001965 increasing effect Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000003909 pattern recognition Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 239000011810 insulating material Substances 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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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
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a first fingerprint identification layer and a second fingerprint identification layer which are positioned at the same side of a display substrate and have an overlapped area in vertical projection, and the first fingerprint identification layer comprises a plurality of first sensing electrode strips extending along a first direction and a plurality of second sensing electrode strips extending along a second direction; the second fingerprint identification layer comprises a plurality of third sensing electrode strips extending along the first direction and a plurality of fourth sensing electrode strips extending along the second direction; the first strip of sense electrodes comprises a first sense electrode, the second strip of sense electrodes comprises a second sense electrode, the third strip of sense electrodes comprises a third sense electrode, and the fourth strip of sense electrodes comprises a fourth sense electrode; in the overlapping area, the third sensing electrode and the first sensing electrode are not overlapped at least partially in the vertical projection of the display substrate, and/or the fourth sensing electrode and the second sensing electrode are not overlapped at least partially in the vertical projection of the display substrate, so that the accuracy of fingerprint identification can be improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
In order to pursue the maximization of the screen ratio, the integration of the fingerprint identification module inside the display area of the panel has become the mainstream development direction.
At present, a fingerprint identification module dpi (Dots Per Inch) of on-screen capacitors has the problem of low accuracy of fingerprint identification.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for increasing the resolution of fingerprint identification and improving the accuracy of fingerprint identification.
According to an aspect of the present invention, there is provided a display panel including:
a display substrate;
the first fingerprint identification layer is positioned on one side of the display substrate and comprises a plurality of first sensing electrode strips extending along a first direction and a plurality of second sensing electrode strips extending along a second direction; the plurality of first sensing electrode strips are sequentially arranged along the second direction, and the plurality of second sensing electrode strips are sequentially arranged along the first direction; wherein each of the first sensing electrode strips comprises a plurality of first sensing electrodes connected in series, and each of the second sensing electrode strips comprises a plurality of second sensing electrodes connected in series; the first sensing electrode is used for receiving a first fingerprint identification driving signal, and the second sensing electrode is used for sending a first fingerprint identification induction signal; the first direction and the second direction are mutually crossed;
the second fingerprint identification layer is positioned on the same side of the display substrate as the first fingerprint identification layer, and a vertical projection of the second fingerprint identification layer on the display substrate and a vertical projection of the first fingerprint identification layer on the display substrate have an overlapping area; the second fingerprint identification layer comprises a plurality of third sensing electrode strips extending along the first direction and a plurality of fourth sensing electrode strips extending along the second direction; the plurality of third sensing electrode strips are sequentially arranged along the second direction, and the plurality of fourth sensing electrode strips are sequentially arranged along the first direction; each of the third sensing electrode strips comprises a plurality of third sensing electrodes connected in series, and each of the fourth sensing electrode strips comprises a plurality of fourth sensing electrodes connected in series; the third sensing electrode is used for receiving a second fingerprint identification driving signal, the fourth sensing electrode is used for sending a second fingerprint identification induction signal, or the fourth sensing electrode is used for receiving the second fingerprint identification driving signal, and the third sensing electrode is used for sending the second fingerprint identification induction signal;
in the overlapping region, each third sensing electrode corresponds to one first sensing electrode, each fourth sensing electrode corresponds to one second sensing electrode, the vertical projection of the third sensing electrode on the display substrate and the vertical projection of the first sensing electrode corresponding to the third sensing electrode on the display substrate are at least partially non-overlapping, and/or the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the second sensing electrode corresponding to the fourth sensing electrode on the display substrate are at least partially non-overlapping.
Optionally, at least a partial region of a vertical projection of the third sensing electrode on the display substrate is located between two adjacent first sensing electrodes along the first direction; at least partial area of the vertical projection of the fourth sensing electrode on the display substrate is positioned between two adjacent second sensing electrodes along the first direction;
and/or at least partial area of the vertical projection of the third sensing electrode on the display substrate is positioned between the adjacent first sensing electrodes along the second direction; at least partial area of the vertical projection of the fourth sensing electrode on the display substrate is located between the second sensing electrodes adjacent to each other along the second direction.
Optionally, the boundaries of the vertical projections of the third sensing electrode and the first sensing electrode corresponding thereto on the display substrate all surround the same sub-pixel group;
the boundaries of the vertical projections of the fourth sensing electrodes and the second sensing electrodes corresponding to the fourth sensing electrodes on the display substrate surround the same sub-pixel group; wherein each of the sub-pixel groups comprises at least one sub-pixel.
Optionally, the distance between the vertical projection of the third sensing electrode on the display substrate and the vertical projection of the two first sensing electrodes nearest to the third sensing electrode on the display substrate is equal;
the distance between the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the two second sensing electrodes which are nearest to the fourth sensing electrode on the display substrate is equal.
Optionally, the first sensing electrode and the fourth sensing electrode are disposed in the same layer, the third sensing electrode and the second sensing electrode are disposed in the same layer, and the third sensing electrode and the fourth sensing electrode are disposed in different layers;
or, the first sensing electrode and the second sensing electrode are arranged in the same layer; the third and fourth sensing electrodes are disposed in the same layer, and the first and third sensing electrodes are disposed in different layers.
Optionally, the display substrate includes a pixel light emitting area and a non-light emitting area between adjacent pixel light emitting areas;
wherein each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the metal ring is not overlapped with the pixel light emitting area.
Optionally, the display panel further includes a touch layer, and the touch layer is located on one side of the display substrate;
the touch layer comprises a fingerprint identification area; the touch layer in the fingerprint identification area is reused as the first fingerprint identification layer or the second fingerprint identification layer.
Optionally, the display panel further includes a thin film encapsulation layer, a polarizer and a cover plate located on the same side of the display substrate;
the first sensing electrode and the second sensing electrode are positioned on at least one film layer of the thin film packaging layer, the polarizer and the cover plate;
the third sensing electrode and the fourth sensing electrode are positioned on at least one film layer of the thin film packaging layer, the polarizer and the cover plate.
Optionally, each of the first sensing electrodes includes n first sub-electrodes electrically insulated from each other; each second sensing electrode comprises n second sub-electrodes which are mutually and electrically insulated; in the first direction, the first sub-electrodes at the same position in two adjacent first sensing electrodes are correspondingly connected one by one; in the second direction, the second sub-electrodes at the same position in two adjacent second sensing electrodes are connected in a one-to-one correspondence manner; wherein n is an integer greater than or equal to 2;
or, each of the third sensing electrodes includes m third sub-electrodes electrically insulated from each other; each of the fourth sensing electrodes comprises m fourth sub-electrodes electrically insulated from each other; in the first direction, the third sub-electrodes at the same position in two adjacent third sensing electrodes are correspondingly connected one by one; in the second direction, the fourth sub-electrodes at the same position in two adjacent fourth sensing electrodes are correspondingly connected one by one; wherein m is an integer greater than or equal to 2.
Optionally, the third sensing electrodes correspond to the first sensing electrodes one to one, and the fourth sensing electrodes correspond to the second sensing electrodes one to one;
the third sensing electrode is the same as the first sensing electrode in shape and size, and the fourth sensing electrode is the same as the second sensing electrode in shape and size.
According to another aspect of the present invention, there is provided a display device including the display panel according to any one of the embodiments of the present invention.
According to the technical scheme, the first fingerprint identification layer is arranged on the display substrate and comprises a plurality of first sensing electrode strips extending along a first direction and a plurality of second sensing electrode strips extending along a second direction; the first sensing electrodes in the first sensing electrode strips are used for receiving the first fingerprint identification driving signals, and the second sensing electrodes in the second sensing electrode strips are used for sending the first fingerprint identification induction signals; the first fingerprint identification layer is a capacitor fingerprint identification module on one screen; on the basis, a second fingerprint identification layer is additionally arranged, and the second fingerprint identification layer comprises a plurality of third sensing electrode strips extending along the first direction and a plurality of fourth sensing electrode strips extending along the second direction; each third sensing electrode strip comprises a plurality of third sensing electrodes connected in series, and each fourth sensing electrode strip comprises a plurality of fourth sensing electrodes connected in series; the third sensing electrode and the fourth sensing electrode are used for finishing receiving the second fingerprint identification driving signal and sending a second fingerprint identification induction signal. Through setting up the vertical projection of third sensing electrode on display substrate and the perpendicular at least part non-overlap of first sensing electrode on display substrate, and/or the vertical projection of fourth sensing electrode on display substrate and the vertical projection of second sensing electrode on display substrate are at least partly non-overlap, make fingerprint detection unit in the second fingerprint identification layer and fingerprint identification area difference of fingerprint detection unit in the first fingerprint identification layer, the fingerprint detection point that the second fingerprint identification layer was confirmed is different with the fingerprint detection point that first fingerprint identification layer was confirmed promptly, the number of fingerprint identification check point has been increased, thereby fingerprint image's dpi has been increased, the fingerprint identification resolution has been increased, fingerprint identification's rate of accuracy has been improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily 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 provided 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 diagram of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first fingerprint identification layer according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a second fingerprint identification layer 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 cross-sectional view of the structure of FIG. 2 taken along line AA 1;
FIG. 8 is another cross-sectional view of the structure of FIG. 2 taken along line AA 1;
FIG. 9 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of another display panel according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of a sensing electrode according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of another sensing electrode according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
As background art, the integration of fingerprint recognition modules into the display area of a panel has become a mainstream development direction. Fig. 1 is a schematic structural diagram of a display panel provided in the prior art, and referring to fig. 1, a fingerprint identification module includes first electrode stripes RX for receiving a fingerprint identification driving signal and second electrode stripes TX for sending a fingerprint identification sensing signal, where the first electrode stripes RX and the second electrode stripes TX are arranged in a crossing manner. The first electrode bar RX includes a plurality of driving electrodes 1022 therein, and the second electrode bar TX includes a plurality of sensing electrodes 1021 therein. The adjacent driving electrodes 1022 form a fingerprint capacitance with the sensing electrode 1021. Drive signal is input to the drive electrode 1022, and when the finger of the person to be measured touches the surface of the module, the capacitance value of the fingerprint capacitor changes, and the signal output by the sensing electrode 1021 changes, so that the fingerprint can be detected based on the signal change. Because the peaks and valleys in the fingerprint lines are convex and the valleys are concave, the capacitance changes of the fingerprint identification sensors corresponding to the peaks and the valleys are different according to the relationship between the capacitance and the distance, and the signals output by the sensing electrodes 1021 in the fingerprint sensors corresponding to the peaks and the valleys are different. Through the signal conversion who will respond to electrode 1021 output two-dimentional image data, can obtain the full width or the local pattern with the fingerprint that the fingerprint identification module contacted, compare the pattern of the fingerprint of acquireing with the pattern of depositing in the fingerprint identification module in advance, if the two coincide then the identity information of measurand has passed through the authentication, can carry out subsequent if sign in, operation such as cell-phone unblock.
At present, the fingerprint identification module is formed by using a metal grid, and in order to prevent the driving electrode 1022 and the sensing electrode 1021 from influencing the normal light emission of the sub-pixels 101, the driving electrode 1022 and the sensing electrode 1021 are arranged between the sub-pixels 101. The spacing between the driving electrodes 1022 and the spacing between the sensing electrodes 1021 all need to be matched with the spacing between the sub-pixels 101, that is, the PPI of the display panel affects the size of the driving electrodes 1022 and the sensing electrodes 1021, the spacing between the driving electrodes 1022 and the spacing between the sensing electrodes 1021, thereby affecting the number of the electrodes, and further affecting the number of pixel points in the fingerprint image collected by the fingerprint identification module. In the display panel with low PPI, the distance between the driving electrodes 1022 and the distance between the sensing electrodes 1021 are both large, so that the problem that the acquired fingerprint image has insufficient fingerprint dpi (Dots Per Inch), the requirement that the fingerprint dpi is more than 500 cannot be met (the sensing electrode distance is less than or equal to 50um), and the accuracy of fingerprint identification is reduced.
In view of this, a display panel is provided in an embodiment of the present invention, fig. 2 is a schematic structural diagram of a display panel provided in an embodiment of the present invention, fig. 3 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, fig. 4 is a schematic structural diagram of a first fingerprint identification layer provided in an embodiment of the present invention, and fig. 5 is a schematic structural diagram of a second fingerprint identification layer provided in an embodiment of the present invention; referring to fig. 2 to 5, the display panel includes:
a display substrate 100;
the first fingerprint identification layer is positioned on one side of the display substrate and comprises a plurality of first sensing electrode strips 1 extending along a first direction X and a plurality of second sensing electrode strips 2 extending along a second direction Y; the plurality of first sensing electrode strips 1 are sequentially arranged along the second direction Y, and the plurality of second sensing electrode strips 2 are sequentially arranged along the first direction X; wherein each first sensing electrode strip 1 comprises a plurality of first sensing electrodes 11 connected in series, and each second sensing electrode strip 2 comprises a plurality of second sensing electrodes 12 connected in series; the first sensing electrode 11 is used for receiving a first fingerprint identification driving signal, and the second sensing electrode 12 is used for sending a first fingerprint identification induction signal; the first direction X and the second direction Y are crossed with each other; the first sensing electrode strips 1 include a plurality of first sensing electrodes 11 connected in series, that is, each first sensing electrode strip 1 includes a plurality of first sensing electrodes 11 arranged in sequence along the first direction X, and adjacent first sensing electrodes 11 are connected to each other, for example, adjacent first sensing electrodes 11 may be connected to each other through a metal wire or a wide transparent electrode wire; in the same second sensing electrode strip 2, the plurality of second sensing electrodes 12 may be connected in sequence through a metal wire or a wide transparent electrode wire to implement series connection;
the second fingerprint identification layer is positioned on the same side of the display substrate 100 as the first fingerprint identification layer, and a vertical projection of the second fingerprint identification layer on the display substrate 100 and a vertical projection of the first fingerprint identification layer on the display substrate 100 have an overlapping area; each second fingerprint identification layer comprises a plurality of third sensing electrode stripes 3 extending along the first direction X and a plurality of fourth sensing electrode stripes 4 extending along the second direction Y; the plurality of third sensing electrode strips 3 are sequentially arranged along the second direction Y, and the plurality of fourth sensing electrode strips 4 are sequentially arranged along the first direction X; each third sensing electrode strip 3 comprises a plurality of third sensing electrodes 21 connected in series, and each fourth sensing electrode strip 4 comprises a plurality of fourth sensing electrodes 22 connected in series; the third sensing electrode 21 is used for receiving a second fingerprint identification driving signal, the fourth sensing electrode 22 is used for sending a second fingerprint identification induction signal, or the fourth sensing electrode 22 is used for receiving the second fingerprint identification driving signal, and the third sensing electrode 21 is used for sending the second fingerprint identification induction signal; in the same third sensing electrode strip 3, the plurality of third sensing electrodes 21 may be sequentially connected through a metal wire or a wide transparent electrode wire to realize a series connection; in the same fourth sensing electrode strip 4, the plurality of fourth sensing electrodes 22 may be connected in sequence through a metal wire or a wide transparent electrode wire to realize a series connection;
in the overlap region, each third sensing electrode 21 corresponds to a first sensing electrode 11, each fourth sensing electrode 22 corresponds to a second sensing electrode 12, a vertical projection of the third sensing electrode 21 on the display substrate and a vertical projection of the corresponding first sensing electrode 11 on the display substrate are at least partially non-overlapping, and/or a vertical projection of the fourth sensing electrode 22 on the display substrate and a vertical projection of the corresponding second sensing electrode 12 on the display substrate are at least partially non-overlapping.
Specifically, the display substrate 100 is used for performing light emitting display, and the display substrate 100 may include a substrate and a plurality of sub-pixels arranged in an array on one side of the substrate. The first direction X may be a row direction in which sub-pixels are arranged in the display panel, and the second direction Y may be a column direction in which sub-pixels are arranged in the display panel. The first direction X and the second direction Y may be perpendicular to each other. A vertical projection of a conducting wire between two first sensing electrodes 11 adjacent along the first direction X on the display substrate 100 is crossed with a vertical projection of a conducting wire between two second sensing electrodes 12 adjacent along the second direction Y on the display substrate 100; the second sensing electrode 12 is electrically insulated from the first sensing electrode 11. The adjacent first sensing electrode 11 and second sensing electrode 12 may form a fingerprint capacitance 30. The first sensing electrode 11 is for receiving a first fingerprint identification driving signal, and the second sensing electrode 12 is for transmitting a first fingerprint identification sensing signal. That is, the IC for fingerprint recognition inputs a driving signal to the first sensing electrode 11, and when the finger of the subject touches the surface of the module, the IC can detect a fingerprint according to a change in a signal sensed by the second sensing electrode 12. Two adjacent first sensing electrodes 11 and two second sensing electrodes 12 adjacent to the two adjacent first sensing electrodes 11 form a fingerprint detection unit 40, and each fingerprint detection unit 40 can determine a fingerprint detection point.
The vertical projection of the conducting wire between two adjacent third sensing electrodes 21 along the first direction X on the display substrate is crossed with the vertical projection of the conducting wire between two adjacent fourth sensing electrodes 22 along the second direction Y on the display substrate; the third sensing electrode 21 is electrically insulated from the fourth sensing electrode 22. The adjacent third and fourth sensing electrodes 21 and 22 may form one fingerprint capacitance 30. If the third sensing electrode 21 is used for receiving the second fingerprint identification driving signal, the fourth sensing electrode 22 is used for sending the second fingerprint identification sensing signal. A driving signal is inputted to the third sensing electrode 13 and when the finger of the subject touches the surface of the module, a fingerprint can be detected according to the signal marks by the fourth sensing electrode 14. If the fourth sensing electrode 22 is used for receiving the second fingerprint identification driving signal, the third sensing electrode 21 is used for sending a second fingerprint identification sensing signal; a driving signal is inputted to the fourth sensing electrode 22 and when the finger of the subject touches the surface of the module, a fingerprint can be detected from a change in the signal from the third sensing electrode 21. Two adjacent third sensing electrodes 21 and two fourth sensing electrodes 22 adjacent to both the adjacent third sensing electrodes 21 may constitute one fingerprint detection unit 40.
The second fingerprint identification layer and the first fingerprint identification layer are located on the same side of the display substrate 100, and a perpendicular projection of the second fingerprint identification layer on the display substrate 100 and a perpendicular projection of the first fingerprint identification layer on the display substrate 100 have an overlapping region. The overlapping area refers to the overlapping area of the whole film layer of the first fingerprint identification layer and the whole film layer of the second fingerprint identification layer. The overlap region may be a partial region of the first fingerprinting layer or the entire region of the first fingerprinting layer. Each third sensing electrode 21 in the overlapping region corresponds in position to a first sensing electrode 11, and each fourth sensing electrode 22 corresponds in position to a second sensing electrode 12. The vertical projection of the third sensing electrode 21 on the display substrate and the vertical projection of the corresponding first sensing electrode 11 on the display substrate do not overlap at least partially, which can be understood as that the vertical projection of the third sensing electrode 21 on the display substrate and the vertical projection of the corresponding first sensing electrode 11 on the display substrate partially overlap or do not overlap. When not overlapped, the vertical projection of the third sensing electrode 21 on the display substrate is located between the vertical projection of the corresponding first sensing electrode 11 on the display substrate and the vertical projection of the first sensing electrode 11 adjacent to the first sensing electrode 11 on the display substrate. The vertical projection of the fourth sensing electrode 22 on the display substrate and the vertical projection of the second sensing electrode 12 corresponding to the fourth sensing electrode on the display substrate do not overlap at least partially, and it can be understood that the vertical projection of the fourth sensing electrode 22 on the display substrate and the vertical projection of the second sensing electrode 12 corresponding to the fourth sensing electrode partially overlap or do not overlap. When not overlapped, the vertical projection of the fourth sensing electrode 22 on the display substrate is located between the vertical projection of the second sensing electrode 12 corresponding to the fourth sensing electrode on the display substrate and the vertical projection of the second sensing electrode 12 adjacent to the second sensing electrode 12 on the display substrate.
In the overlapped area, by setting that the vertical projection of the third sensing electrode 21 on the display substrate is not overlapped with at least part of the vertical projection of the first sensing electrode 11 on the display substrate, and/or the vertical projection of the fourth sensing electrode 22 on the display substrate is not overlapped with at least part of the vertical projection of the second sensing electrode 12 on the display substrate, the fingerprint identification areas of the fingerprint detection unit 40 in the second fingerprint identification layer and the fingerprint detection unit 40 in the first fingerprint identification layer are different, namely the fingerprint detection point determined by the second fingerprint identification layer is different from the fingerprint detection point determined by the first fingerprint identification layer, the number of the fingerprint identification detection points is increased, so that dpi of a fingerprint image is increased, and the effects of increasing fingerprint identification resolution and improving fingerprint identification accuracy are achieved.
In addition, the area of the perpendicular projection of the second fingerprint identification layer on the display substrate and the area of the perpendicular projection of the first fingerprint identification layer on the display substrate may be equal or unequal. The number of the third sensing electrode stripes 3 and the number of the fourth sensing electrode stripes 4 included in the second fingerprint layer may be the same as or different from the number of the first sensing electrode stripes 1 and the number of the second sensing electrode stripes 2 in the first fingerprint layer, respectively. The number of the third sensing electrodes 21 included in the third sensing electrode strip 3 may be the same as or different from the number of the first sensing electrodes 11 included in the first sensing electrode strip 1; the number of fourth sensing electrodes 22 included in fourth sensing electrode strip 4 may be the same as or different from the number of first sensing electrodes 11 included in second sensing electrode strip 2. A column of sub-pixels or a plurality of columns of sub-pixels can be spaced between two adjacent first sensing electrode strips 1; two adjacent second sensing electrode bars 2 may be spaced apart by one row of sub-pixels or a plurality of rows of sub-pixels. A column of sub-pixels or a plurality of columns of sub-pixels can be spaced between two adjacent third sensing electrode strips 3; two adjacent fourth sensing electrode bars 4 may be spaced apart by one row of sub-pixels or a plurality of rows of sub-pixels. The arrangement density of the sensing electrodes in the first fingerprint identification layer is the same as that of the sensing electrodes in the second fingerprint identification layer.
It should be noted that the first sensing electrode 11, the second sensing electrode 12, the third sensing electrode 21 and the fourth sensing electrode 22 need to be electrically insulated from each other. The arrangement mode of the sub-pixels in the display panel can be set according to actual requirements, and the arrangement mode of the sub-pixels is not limited in the embodiment.
According to the display panel provided by the embodiment of the invention, the first fingerprint identification layer is arranged on the display substrate and comprises a plurality of first sensing electrode strips extending along a first direction and a plurality of second sensing electrode strips extending along a second direction; the first sensing electrodes in the first sensing electrode strips are used for receiving first fingerprint identification driving signals, and the second sensing electrodes in the second sensing electrode strips are used for sending first fingerprint identification induction signals; the first fingerprint identification layer is a capacitor fingerprint identification module on one screen; on the basis, a second fingerprint identification layer is additionally arranged, and the second fingerprint identification layer comprises a plurality of third sensing electrode strips extending along the first direction and a plurality of fourth sensing electrode strips extending along the second direction; each third sensing electrode strip comprises a plurality of third sensing electrodes connected in series, and each fourth sensing electrode strip comprises a plurality of fourth sensing electrodes connected in series; the third sensing electrode and the fourth sensing electrode are used for receiving a second fingerprint identification driving signal and sending a second fingerprint identification induction signal. The vertical projection of the third sensing electrode on the display substrate is not overlapped with at least part of the vertical projection of the first sensing electrode on the display substrate, and/or the vertical projection of the fourth sensing electrode on the display substrate is not overlapped with at least part of the vertical projection of the second sensing electrode on the display substrate, so that the fingerprint identification areas of the fingerprint detection unit in the second fingerprint identification layer and the fingerprint detection unit in the first fingerprint identification layer are different, namely the fingerprint detection point determined by the second fingerprint identification layer is different from the fingerprint detection point determined by the first fingerprint identification layer, the number of the fingerprint detection points is increased, the dpi of the fingerprint image is increased, the fingerprint identification resolution is increased, and the accuracy of the fingerprint identification is improved.
Alternatively, referring to fig. 2 and 3, the third sensing electrodes 21 correspond to the first sensing electrodes 11 one to one, and the fourth sensing electrodes 22 correspond to the second sensing electrodes 12 one to one. On this basis, by setting that the vertical projection of the third sensing electrode 21 on the display substrate 100 is at least partially not overlapped with the vertical projection of the first sensing electrode 11 on the display substrate 100, and/or the vertical projection of the fourth sensing electrode 22 on the display substrate 100 is at least partially not overlapped with the vertical projection of the second sensing electrode 12 on the display substrate 100, compared with the case that a single fingerprint image is collected by using a single fingerprint identification layer, the dpi of the fingerprint image determined by the double fingerprint identification layers can be doubled, the resolution of fingerprint identification can be further increased, and the accuracy of fingerprint identification can be improved.
In one embodiment of the present invention, referring to fig. 2, at least a partial region of the vertical projection of the third sensing electrode 21 on the display substrate 100 is located between two adjacent first sensing electrodes 11 along the first direction X; at least a partial region of the vertical projection of the fourth sensing electrode 22 on the display substrate 100 is located between two adjacent second sensing electrodes 12 along the first direction X.
Specifically, when the display panel is viewed from above, the first sensing electrode 11 and the third sensing electrode 21 are disposed to be shifted from each other in the first direction X, and the second sensing electrode 12 and the fourth sensing electrode 22 are also disposed to be shifted from each other in the first direction X. If the pixel point in the fingerprint image collected by the first fingerprint identification layer is a first pixel point, the pixel point in the fingerprint image collected by the second fingerprint identification layer is a second pixel point; in the fingerprint image determined by combining the first fingerprint identification layer with the second fingerprint identification layer, in the first direction X, the pixel points in each row include first pixel points and second pixel points, and the first pixel points and the second pixel points are sequentially alternated. That is to say, for the fingerprint image that is confirmed by the first line identification layer of individual layer, in the fingerprint image that first line identification layer combines the second line identification layer to confirm, in first direction X, increased a second pixel between every two adjacent first pixels to increase fingerprint image's dpi, reached the effect that increases fingerprint identification resolution, improves the fingerprint identification rate of accuracy.
In another embodiment of the present invention, referring to fig. 3, at least a partial region of the vertical projection of the third sensing electrode 21 on the display substrate 100 is located between the first sensing electrodes 11 adjacent in the second direction Y; at least a partial region of the vertical projection of the fourth sensing electrode 22 on the display substrate 100 is located between the second sensing electrodes 12 adjacent to each other along the second direction Y. It can be understood that the first sensing electrode 11 and the third sensing electrode 21 are disposed in a staggered manner in the second direction Y; the second sensing electrode 12 and the fourth sensing electrode 22 are also arranged offset in the second direction Y. For the fingerprint image determined by the single-layer first line identification layer, the number of pixel points is increased in the fingerprint image determined by the combination of the first line identification layer and the second line identification layer in the second direction Y. Therefore, dpi of the fingerprint image is increased, and the effects of increasing fingerprint identification resolution and improving fingerprint identification accuracy are achieved.
Optionally, the boundaries of the vertical projections of the third sensing electrode 21 and the corresponding first sensing electrode 11 on the display substrate 100 all surround the same sub-pixel group;
the boundaries of the vertical projections of the fourth sensing electrodes 22 and the corresponding second sensing electrodes 12 on the display substrate 100 surround the same sub-pixel group; wherein each sub-pixel group comprises at least one sub-pixel.
Specifically, each sensing electrode corresponds to a sub-pixel group, i.e., the boundary of the vertical projection on the display substrate 100 surrounds a sub-pixel group. According to actual needs, the number of the sub-pixels corresponding to each sensing electrode may be one or more. The boundaries of the vertical projections of the two sensing electrodes corresponding to each other on the display substrate 100 all surround the same sub-pixel group, so that the two sensing electrodes corresponding to each other form a dual-ring nested structure. Each third sensing electrode 21 and the corresponding first sensing electrode 11 form a double-ring nested structure; each fourth sensing electrode 22 and its corresponding second sensing electrode 12 form a dual loop nested structure. Can guarantee in second fingerprint identification layer that fingerprint detecting element is different with fingerprint identification area of fingerprint detecting element in the first fingerprint identification layer, when increasing the number of fingerprint detection point, can also reduce the total area that sensing electrode accounts for display substrate 100 in sensing electrode and the second fingerprint identification layer in the first fingerprint identification layer to and reduce the degree of difficulty that sensing electrode and subpixel group correspond the matching.
Optionally, fig. 6 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, and referring to fig. 6, a distance between a vertical projection of the third sensing electrode 21 on the display substrate 100 and a vertical projection of two of the first sensing electrodes 11 nearest to the third sensing electrode on the display substrate 100 is equal; the distance between the vertical projection of the fourth sensing electrode 22 on the display substrate 100 and the vertical projections of the two second sensing electrodes 12 nearest thereto on the display substrate 100 is equal.
Specifically, if the sensing electrodes in the second fingerprint identification layer are misaligned with respect to the sensing electrodes in the first fingerprint identification layer in the first direction X (as shown in fig. 6), in the first direction X, the vertical projection of the third sensing electrode 21 on the display substrate 100 is located at an intermediate position between the vertical projections of the two first sensing electrodes 11 that are most adjacent to the third sensing electrode on the display substrate 100; the vertical projection of the fourth sensing electrode 22 on the display substrate 100 is located at an intermediate position between the vertical projections of the two second sensing electrodes 12 most adjacent thereto on the display substrate 100. In the intermediate position, the vertical projection of the third sensing electrode 21 on the display substrate 100 and the vertical projections of the two first sensing electrodes 11 nearest thereto on the display substrate 100 may not overlap or may partially overlap, and the exemplary illustration in fig. 6 does not overlap. Since the third sensing electrode 21 and the first sensing electrode 11 may be disposed in different layers, there is no short circuit between the third sensing electrode 21 and the first sensing electrode 11 when overlapped. Likewise, the vertical projection of the fourth sensing electrode 22 on the display substrate 100 and the vertical projections of the two second sensing electrodes 12 nearest thereto on the display substrate 100 may not overlap or may partially overlap, which is exemplarily shown in fig. 6. Since the fourth sensing electrode 22 and the second sensing electrode 12 may be disposed in different layers, there is no short circuit between the fourth sensing electrode 22 and the second sensing electrode 12 when overlapped.
If the sensing electrodes in the second fingerprint identification layer are misaligned (not shown) in the second direction Y relative to the sensing electrodes in the first fingerprint identification layer, the vertical projection of the third sensing electrode 21 on the display substrate 100 is located at an intermediate position between the vertical projections of the two first sensing electrodes 11 nearest to the third sensing electrode on the display substrate 100 in the second direction Y; the fourth sensing electrode 22 is located at an intermediate position between a vertical projection on the display substrate 100 and a vertical projection on the display substrate 100 of the two second sensing electrodes 12 most adjacent thereto. The pixel points in the fingerprint image determined by the second fingerprint identification layer in combination with the first fingerprint identification layer can be uniformly distributed, so that the fingerprint characteristics can be analyzed, and the accuracy of fingerprint identification is improved.
Alternatively, fig. 7 is a cross-sectional view of the structure shown in fig. 2 along line AA1, and referring to fig. 7 and 2, the first sensing electrode 11 and the fourth sensing electrode 22 are disposed at the same layer, the third sensing electrode 21 and the second sensing electrode 12 are disposed at the same layer, and the third sensing electrode 21 and the fourth sensing electrode 22 are disposed at different layers.
Alternatively, fig. 8 is another cross-sectional view of the structure shown in fig. 2 taken along line AA1, and referring to fig. 8 and 2, the first sensing electrode 11 and the second sensing electrode 12 are disposed in the same layer; the third and fourth sensing electrodes 21 and 22 are disposed at the same layer, and the first and third sensing electrodes 11 and 21 are disposed at different layers.
Specifically, the two sensing electrodes disposed in the same layer may be understood as two sensing electrodes located on the surface of the same film layer, and the two sensing electrodes having overlapping portions in the vertical projection on the display substrate 100 cannot be disposed in the same layer. Referring to fig. 7, two sensing electrodes in the same fingerprint identification layer are disposed on the surfaces of two film layers, that is, the first sensing electrode 11 and the second sensing electrode 12 in the first fingerprint identification layer are disposed on different layers, and the third sensing electrode 21 and the fourth sensing electrode 22 in the second fingerprint identification layer are disposed on different layers, at this time, the first sensing electrode 11 and the fourth sensing electrode 22 are disposed on the same layer, and the third sensing electrode 21 and the second sensing electrode 12 are disposed on the same layer. Alternatively, referring to fig. 8, both sensing electrodes in the same fingerprint identification layer are disposed on the surface of one film layer, and the sensing electrodes of different fingerprint identification layers are located on the surfaces of different film layers. Namely, the first sensing electrode 11 and the second sensing electrode 12 are arranged in the same layer; the third and fourth sensing electrodes 21 and 22 are disposed at the same layer, and the first and third sensing electrodes 11 and 21 are disposed at different layers. Divide four kinds of sensing electrodes in first fingerprint identification layer and the second fingerprint identification layer equally on two retes, can reduce the number of the sensing electrode that holds on the same rete to can leave sufficient dislocation space for the dislocation set of the sensing electrode in the first fingerprint identification layer in the sensing electrode in the second fingerprint identification layer. The sensing electrodes arranged on the same layer can be formed in the same manufacturing process, so that the manufacturing efficiency of the display panel can be improved.
In addition, for the first and third sensing electrodes 11 and 21, when the vertical projections of the first and third sensing electrodes 11 and 21 on the display substrate 100 do not overlap all, the first and third sensing electrodes 11 and 21 may be disposed in the same layer. For the second sensing electrode 12 and the fourth sensing electrode 22, when the vertical projections of the second sensing electrode 12 and the fourth sensing electrode 22 on the display substrate 100 are all non-overlapping, the second sensing electrode 12 and the fourth sensing electrode 22 may be disposed in the same layer.
Optionally, fig. 9 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and fig. 10 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and referring to fig. 9 and fig. 10, the display substrate includes a light emitting region of a pixel and a non-light emitting region between light emitting regions of adjacent pixels; wherein each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the metal ring is not overlapped with the pixel light emitting area.
Specifically, the display substrate includes a substrate 102 and a light emitting layer disposed on the substrate 102; the light-emitting layer is positioned on one side of the substrate base plate close to the first fingerprint identification layer; the light emitting layer includes a plurality of sub-pixels 101 arranged in an array; the area where the sub-pixels 101 are located is a pixel light emitting area, and the area between two adjacent sub-pixels 101 is a non-light emitting area between the adjacent pixel light emitting areas. Each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the sensing electrode may be a metal ring disposed around the sub-pixel 101 such that a vertical projection of the metal ring on the light emitting layer does not overlap with the sub-pixel 101. Alternatively, the sensing electrode may include a metal ring and a transparent conductive block located within the metal ring. Or, each sensing electrode in the two fingerprint identification layers may be a transparent conductive block, which may solve the problem that the sensing electrode affects the light emission of the sub-pixel 101. Wherein the material of the transparent conductive block can be ITO, for example. In addition, the connection line between the sensing electrodes may be a transparent conductive material to avoid the influence of the connection line on the light emission of the sub-pixel 101.
When the sensing electrode is the metal ring, the first fingerprint identification layer and the second fingerprint identification layer are formed by adopting metal grids. In order to prevent the sensing electrode of the metal mesh structure from affecting the normal light emission of the sub-pixel 101, the vertical projection of the metal ring on the light emitting layer is not overlapped with the sub-pixel 101. At this time, referring to fig. 10, the first sensing electrode 11 of a metal ring shape and the third sensing electrode 21 of a metal ring shape may constitute a double ring nested structure, and the second sensing electrode 12 of a metal ring shape and the fourth sensing electrode 22 of a metal ring shape may constitute a double ring nested structure. Among them, the sub-pixel 101 includes a red sub-pixel R for emitting red light, a green sub-pixel G for emitting green light, and a blue sub-pixel B for emitting blue light. Fig. 10 exemplarily shows one sub-pixel 101 corresponding to each sensing electrode, and the number of the sub-pixels 101 corresponding to each sensing electrode may be multiple according to actual needs. For example, in the prior art, one sensing electrode corresponds to 4 sub-pixels 101, and the dpi of the fingerprint image can still be improved by adopting double-loop nesting without changing the condition that one sensing electrode corresponds to 4 sub-pixels 101.
Optionally, fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 11, the display panel further includes a touch layer 200, the touch layer is located on one side of the display substrate 100; the touch layer 200 includes a fingerprint identification area 201; the touch layer of fingerprint identification district 201 multiplexes to first fingerprint identification layer or second fingerprint identification layer.
Specifically, the multiplexing of touch-control layer of fingerprint identification district 201 is first fingerprint identification layer or second fingerprint identification layer for fingerprint identification can be carried out on touch-control layer 200 of fingerprint identification district 201 when fingerprint identification, reduces one deck fingerprint identification layer, can reduce display panel thickness and cost. Wherein the fingerprint identification area may have a quadrilateral shape, a triangular shape, a diamond shape, a circular shape, an elliptical shape, a semicircular shape, a polygonal shape, or a combination thereof.
Optionally, referring to fig. 7 and 8, the display panel further includes a thin film encapsulation layer 300, a polarizer 400, and a cover plate 500 on the same side of the display substrate 100; the first sensing electrode 11 and the second sensing electrode 12 are located on at least one of the thin film encapsulation layer 300, the polarizer 400 and the cover plate 500; the third and fourth sensing electrodes 21 and 22 are located on at least one of the thin film encapsulation layer 300, the polarizer 400, and the cover 500.
Specifically, the first sensing electrode 11 and the second sensing electrode 12 may be located on the same film layer of the thin film encapsulation layer 300, the polarizer 400 and the cover plate 500, or the first sensing electrode 11 and the second sensing electrode 12 may be located on different film layers of the thin film encapsulation layer 300, the polarizer 400 and the cover plate 500, respectively. The third sensing electrode 21 and the fourth sensing electrode 22 may be located on the same film layer of the thin film encapsulation layer 300, the polarizer 400 and the cover plate 500, or the third sensing electrode 21 and the fourth sensing electrode 22 may be located on different film layers of the thin film encapsulation layer 300, the polarizer 400 and the cover plate 500, respectively.
In fig. 7, the first sensing electrode 11 and the second sensing electrode 12 are exemplarily shown to be respectively located on two film layers, the first sensing electrode 11 is located between the polarizer 400 and the thin film encapsulation layer 300, and the second sensing electrode 12 is located between the cover 500 and the polarizer 400; the third sensing electrode 21 and the fourth sensing electrode 22 are respectively located on the two films, the third sensing electrode 21 is located between the cover 500 and the polarizer 400, and the fourth sensing electrode 22 is located between the polarizer 400 and the thin film encapsulation layer 300. Fig. 8 exemplarily shows that the first sensing electrode 11 and the second sensing electrode 12 are both located on the upper surface of the thin film encapsulation layer 300; the third sensing electrode 21 and the fourth sensing electrode 22 are both located on the upper surface of the polarizer 400. Because film packaging layer, polaroid and apron are the rete of insulating material in the display panel, can utilize the insulating nature of rete to make electrical insulation between the sensing electrode, need not to set up insulating rete alone between two-layer sensing electrode to can reduce the thickness of display panel, reduce display panel's cost.
Alternatively, referring to fig. 12 and 13, each of the first sensing electrodes 11 includes n first sub-electrodes 110 electrically insulated from each other; each second sensing electrode 12 comprises n second sub-electrodes 120 electrically insulated from each other; in the first direction X, the first sub-electrodes 110 at the same position in two adjacent first sensing electrodes 11 are connected in a one-to-one correspondence; in the second direction Y, the second sub-electrodes 120 at the same position in two adjacent second sensing electrodes 12 are connected in a one-to-one correspondence; where n is an integer greater than or equal to 2 (exemplary structures in fig. 12 and 13 when n is 2 are drawn). The first sensing electrode 11 and the second sensing electrode 12 may be transparent conductive blocks to avoid the influence on the light emission of the sub-pixels after the metal ring-shaped sensing electrode is divided into sub-electrodes.
Referring to fig. 12, each of the first sub-electrodes 110 in the first sensing electrodes 11 may be an electrode (RX) for receiving a first fingerprint identification driving signal, and each of the second sub-electrodes 120 in the second sensing electrodes 12 may be an electrode (TX) for transmitting a first fingerprint identification sensing signal. Alternatively, referring to fig. 13, a part of the first sub-electrodes 110 in the first sensing electrodes 11 are used as electrodes (RX) for receiving the first pattern recognition driving signal, and a part of the first sub-electrodes 110 are used as electrodes (TX) for transmitting the first pattern recognition inducing signal; a portion of the second sub-electrodes 120 in the second sensing electrodes are used as electrodes for transmitting the first pattern recognition sensing signal, and a portion of the first sub-electrodes 120 in the second sensing electrodes are used as electrodes for receiving the first pattern recognition driving signal.
The embodiment of the present invention divides the first sensing electrode 11 and the second sensing electrode 12 into a plurality of sub-electrodes. In the first direction X, the first sub-electrodes 110 at the same positions in two adjacent first sensing electrodes 11 are connected in a one-to-one correspondence manner, so that in each first sensing electrode strip, the first sub-electrodes 110 arranged along the first direction X are sequentially and electrically connected end to form an electrode strip, that is, each first sensing electrode strip is divided into a plurality of electrode strips extending along the first direction X. Illustratively, referring to fig. 12 and 13, the first sensing electrode strip is divided into two electrode strips. In the second direction Y, the second sub-electrodes 120 at the same positions in two adjacent second sensing electrodes 12 are connected in a one-to-one correspondence manner, so that in each second sensing electrode strip, the second sub-electrodes 120 arranged along the second direction Y are sequentially connected end to form one electrode strip, that is, each second sensing electrode strip can be divided into a plurality of electrode strips. Illustratively, referring to fig. 12 and 13, the second sensing electrode strip is divided into two electrode strips. And then make the number that is used for receiving the electrode strip of first line discernment drive signal in the first fingerprint identification layer increase doubly, the number that is used for sending the electrode strip of first line discernment sensing signal in the first fingerprint identification layer increases doubly, has increased the number of fingerprint identification check point in the first fingerprint identification layer unit area to increase fingerprint image's dpi, reached the effect that increases fingerprint identification resolution, improves the fingerprint identification rate of accuracy.
Optionally, each third sensing electrode comprises m third sub-electrodes electrically insulated from each other; each fourth sensing electrode comprises m fourth sub-electrodes which are mutually and electrically insulated; in the first direction X, the third sub-electrodes at the same position in two adjacent third sensing electrodes are connected in a one-to-one correspondence; in the second direction Y, the fourth sub-electrodes at the same position in two adjacent fourth sensing electrodes are correspondingly connected one by one; wherein m is an integer greater than or equal to 2. The number of the fingerprint identification detection points in the unit area of the second fingerprint identification layer can be increased, so that dpi of a fingerprint image is increased, and the effects of increasing fingerprint identification resolution and improving fingerprint identification accuracy are achieved.
Optionally, the third sensing electrode and the first sensing electrode are the same in shape and size, and the fourth sensing electrode and the second sensing electrode are the same in shape and size, so that the manufacturing process of the display panel can be simplified. Wherein the shape of the sensing electrode may comprise a quadrilateral shape, a triangular shape, a diamond shape, a circular shape, an elliptical shape, a semi-circular shape, a polygonal shape, or combinations thereof.
Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 1, the display device includes the display panel according to any of the embodiments described above, and a display area of the display panel includes a fingerprint identification area 201. Have the same technical effect and are not described in detail herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A display panel, comprising:
a display substrate;
the first fingerprint identification layer is positioned on one side of the display substrate and comprises a plurality of first sensing electrode strips extending along a first direction and a plurality of second sensing electrode strips extending along a second direction; the plurality of first sensing electrode strips are sequentially arranged along the second direction, and the plurality of second sensing electrode strips are sequentially arranged along the first direction; wherein each of the first sensing electrode strips comprises a plurality of first sensing electrodes connected in series, and each of the second sensing electrode strips comprises a plurality of second sensing electrodes connected in series; the first sensing electrode is used for receiving a first fingerprint identification driving signal, and the second sensing electrode is used for sending a first fingerprint identification induction signal; the first direction and the second direction are mutually crossed;
the second fingerprint identification layer is positioned on the same side of the display substrate as the first fingerprint identification layer, and a vertical projection of the second fingerprint identification layer on the display substrate and a vertical projection of the first fingerprint identification layer on the display substrate have an overlapping area; the second fingerprint identification layer comprises a plurality of third sensing electrode strips extending along the first direction and a plurality of fourth sensing electrode strips extending along the second direction; the plurality of third sensing electrode strips are sequentially arranged along the second direction, and the plurality of fourth sensing electrode strips are sequentially arranged along the first direction; each of the third sensing electrode strips comprises a plurality of third sensing electrodes connected in series, and each of the fourth sensing electrode strips comprises a plurality of fourth sensing electrodes connected in series; the third sensing electrode is used for receiving a second fingerprint identification driving signal, the fourth sensing electrode is used for sending a second fingerprint identification induction signal, or the fourth sensing electrode is used for receiving the second fingerprint identification driving signal, and the third sensing electrode is used for sending the second fingerprint identification induction signal;
in the overlapping region, each third sensing electrode corresponds to one first sensing electrode, each fourth sensing electrode corresponds to one second sensing electrode, the vertical projection of the third sensing electrode on the display substrate and the vertical projection of the first sensing electrode corresponding to the third sensing electrode on the display substrate are at least partially non-overlapping, and/or the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the second sensing electrode corresponding to the fourth sensing electrode on the display substrate are at least partially non-overlapping.
2. The display panel according to claim 1,
at least partial area of the vertical projection of the third sensing electrode on the display substrate is positioned between two adjacent first sensing electrodes along the first direction; at least partial area of the vertical projection of the fourth sensing electrode on the display substrate is positioned between two adjacent second sensing electrodes along the first direction;
and/or at least partial area of the vertical projection of the third sensing electrode on the display substrate is positioned between the adjacent first sensing electrodes along the second direction; at least partial area of the vertical projection of the fourth sensing electrode on the display substrate is located between the second sensing electrodes adjacent to each other along the second direction.
3. The display panel according to claim 1,
the boundaries of the vertical projections of the third sensing electrodes and the first sensing electrodes corresponding to the third sensing electrodes on the display substrate all surround the same sub-pixel group;
the boundaries of the vertical projections of the fourth sensing electrodes and the second sensing electrodes corresponding to the fourth sensing electrodes on the display substrate surround the same sub-pixel group; wherein each of the sub-pixel groups comprises at least one sub-pixel.
4. The display panel according to claim 1,
the distance between the vertical projection of the third sensing electrode on the display substrate and the vertical projections of the two first sensing electrodes which are most adjacent to the third sensing electrode on the display substrate is equal;
the distance between the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the two second sensing electrodes which are nearest to the fourth sensing electrode on the display substrate is equal.
5. The display panel according to claim 1,
the first sensing electrode and the fourth sensing electrode are arranged in the same layer, the third sensing electrode and the second sensing electrode are arranged in the same layer, and the third sensing electrode and the fourth sensing electrode are arranged in different layers;
or, the first sensing electrode and the second sensing electrode are arranged in the same layer; the third and fourth sensing electrodes are disposed in the same layer, and the first and third sensing electrodes are disposed in different layers.
6. The display panel according to claim 1, wherein the display substrate includes a pixel light-emitting area and a non-light-emitting area between adjacent pixel light-emitting areas;
wherein each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the metal ring is not overlapped with the pixel light emitting area;
preferably, the display panel further comprises a touch layer, and the touch layer is located on one side of the display substrate;
the touch layer comprises a fingerprint identification area; the touch layer in the fingerprint identification area is reused as the first fingerprint identification layer or the second fingerprint identification layer.
7. The display panel of claim 1, further comprising a thin film encapsulation layer, a polarizer, and a cover plate on the same side of the display substrate;
the first sensing electrode and the second sensing electrode are positioned on at least one film layer of the thin film packaging layer, the polarizer and the cover plate;
the third sensing electrode and the fourth sensing electrode are positioned on at least one film layer of the thin film packaging layer, the polarizer and the cover plate.
8. The display panel according to claim 1,
each of the first sensing electrodes includes n first sub-electrodes electrically insulated from each other; each second sensing electrode comprises n second sub-electrodes which are mutually and electrically insulated; in the first direction, the first sub-electrodes at the same position in two adjacent first sensing electrodes are correspondingly connected one by one; in the second direction, the second sub-electrodes at the same positions in two adjacent second sensing electrodes are correspondingly connected one by one; wherein n is an integer greater than or equal to 2;
or, each of the third sensing electrodes includes m third sub-electrodes electrically insulated from each other; each of the fourth sensing electrodes comprises m fourth sub-electrodes electrically insulated from each other; in the first direction, the third sub-electrodes at the same position in two adjacent third sensing electrodes are connected in a one-to-one correspondence manner; in the second direction, the fourth sub-electrodes at the same position in two adjacent fourth sensing electrodes are correspondingly connected one by one; wherein m is an integer greater than or equal to 2.
9. The display panel according to claim 1, wherein the third sensing electrodes correspond to the first sensing electrodes one to one, and the fourth sensing electrodes correspond to the second sensing electrodes one to one;
the third sensing electrode is the same as the first sensing electrode in shape and size, and the fourth sensing electrode is the same as the second sensing electrode in shape and size.
10. A display device comprising the display panel according to any one of claims 1 to 9.
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