CN115100962B - Display panel and display device - Google Patents
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- CN115100962B CN115100962B CN202210753450.2A CN202210753450A CN115100962B CN 115100962 B CN115100962 B CN 115100962B CN 202210753450 A CN202210753450 A CN 202210753450A CN 115100962 B CN115100962 B CN 115100962B
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- 239000000758 substrate Substances 0.000 claims abstract description 130
- 239000010408 film Substances 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 238000005538 encapsulation Methods 0.000 claims description 11
- 239000010409 thin film Substances 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 174
- 238000010586 diagram Methods 0.000 description 19
- 238000003909 pattern recognition Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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 on the same side of a display substrate and are provided with overlapping areas in a vertical projection mode, 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 sensing electrode strip comprises a first sensing electrode, the second sensing electrode strip comprises a second sensing electrode, the third sensing electrode strip comprises a third sensing electrode, and the fourth sensing electrode strip comprises a fourth sensing electrode; in the overlapping region, the vertical projection of the third sensing electrode and the first sensing electrode on the display substrate is at least partially not overlapped, and/or the vertical projection of the fourth sensing electrode and the second sensing electrode on the display substrate is at least partially not overlapped, so that the fingerprint identification accuracy 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 recognition module inside the display area of the panel has become the mainstream development direction.
At present, an on-screen capacitance fingerprint identification module dpi (Dots Per Inch) has the problem of low fingerprint identification accuracy.
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 bars includes a plurality of first sensing electrodes connected in series, and each of the second sensing electrode bars includes 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 intersected with each other;
the second fingerprint identification layer is positioned on the same side of the display substrate as the first fingerprint identification layer, and the vertical projection of the second fingerprint identification layer on the display substrate and the vertical projection of the first fingerprint identification layer on the display substrate have overlapping areas; the second fingerprint identification layer comprises a plurality of third sensing electrode bars extending along the first direction and a plurality of fourth sensing electrode bars extending along the second direction; the third sensing electrode strips are sequentially arranged along the second direction, and the fourth sensing electrode strips are sequentially arranged along the first 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 is used for receiving a second fingerprint identification driving signal, the fourth sensing electrode is used for sending a second fingerprint identification sensing 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 sensing 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 not overlapped, 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 not overlapped.
Optionally, at least a partial area of the vertical projection of the third sensing electrode on the display substrate is located between two first sensing electrodes adjacent along the first direction; at least a 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 a partial area of a vertical projection of the third sensing electrode on the display substrate is located between the first sensing electrodes adjacent along the second direction; at least a partial area of the vertical projection of the fourth sensing electrode on the display substrate is positioned between the second sensing electrodes adjacent along the second direction.
Optionally, the boundaries of the vertical projection of the third sensing electrode and the first sensing electrode corresponding to the third sensing electrode on the display substrate encircle the same sub-pixel group;
the boundaries of the vertical projection of the fourth sensing electrode and the second sensing electrode corresponding to the fourth sensing electrode on the display substrate encircle the same sub-pixel group; wherein each of the sub-pixel groups includes 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 nearest first sensing electrodes 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 nearest second sensing electrodes on the display substrate is equal.
Optionally, the first sensing electrode is disposed in the same layer as the fourth sensing electrode, the third sensing electrode is disposed in the same layer as the second sensing electrode, and the third sensing electrode is disposed in a different layer from the fourth sensing electrode;
Or the first sensing electrode and the second sensing electrode are arranged on the same layer; the third sensing electrode and the fourth sensing electrode are disposed in the same layer, and the first sensing electrode and the third sensing electrode are disposed in different layers.
Optionally, the display substrate includes a pixel light emitting region and a non-light emitting region between adjacent pixel light emitting regions;
wherein each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the metal ring does not overlap the pixel light emitting region.
Optionally, the display panel further includes a touch layer, where the touch layer is located at one side of the display substrate;
The touch control layer comprises a fingerprint identification area; the touch control layer of the fingerprint identification area is multiplexed into the first fingerprint identification layer or the second fingerprint identification layer.
Optionally, the display panel further includes a film packaging 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 among the film packaging layer, the polaroid and the cover plate;
the third sensing electrode and the fourth sensing electrode are located on at least one of the film packaging layer, the polaroid and the cover plate.
Optionally, each of the first sensing electrodes includes n first sub-electrodes electrically insulated from each other; each of the second sensing electrodes includes n second sub-electrodes electrically insulated from each other; in the first direction, the first sub-electrodes at the same position in two adjacent first sensing electrodes are connected in a one-to-one correspondence manner; 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 comprises m third sub-electrodes electrically insulated from each other; each of the fourth sensing electrodes includes 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 connected in a one-to-one correspondence manner; wherein m is an integer greater than or equal to 2.
Optionally, the third sensing electrodes are in one-to-one correspondence with the first sensing electrodes, and the fourth sensing electrodes are in one-to-one correspondence with the second sensing electrodes;
The third sensing electrode and the first sensing electrode are identical in shape and size, and the fourth sensing electrode and the second sensing electrode are identical 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 electrode in the first sensing electrode strip is used for receiving a first fingerprint identification driving signal, and the second sensing electrode in the second sensing electrode strip is used for sending a first fingerprint identification sensing signal; the first fingerprint identification layer is an on-screen capacitance fingerprint identification module; 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 the second fingerprint identification driving signal and sending the second fingerprint identification sensing signal. By setting the vertical projection of the third sensing electrode on the display substrate and the vertical projection of the first sensing electrode on the display substrate to be at least partially non-overlapped, and/or the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the second sensing electrode on the display substrate to be at least partially non-overlapped, the fingerprint detection units in the second fingerprint identification layer are different from the fingerprint identification areas of the fingerprint detection units in the first fingerprint identification layer, namely the fingerprint detection points determined by the second fingerprint identification layer are different from the fingerprint detection points determined by the first fingerprint identification layer, the number of the fingerprint identification detection points is increased, so that dpi of fingerprint images is increased, fingerprint identification resolution is increased, and fingerprint identification accuracy is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view 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 structural diagram of another display panel according to an embodiment of the present invention;
FIG. 11 is a schematic 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 invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As background art, integrating fingerprint recognition modules inside 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, referring to fig. 1, a fingerprint recognition module includes a first electrode stripe RX for receiving a fingerprint recognition driving signal and a second electrode stripe TX for transmitting a fingerprint recognition sensing signal, where the first electrode stripe RX and the second electrode stripe TX are disposed 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 electrode 1022 and sensing electrode 1021 form a fingerprint capacitor. When a finger of a person to be detected touches the surface of the module, a capacitance value of the fingerprint capacitor changes, a signal output from the sensing electrode 1021 changes, and a fingerprint can be detected based on the signal change. Since the peaks in the fingerprint lines are convex and the valleys are concave, the capacitance change of the fingerprint identification sensor corresponding to the peaks and the valleys is different according to the relationship between the capacitance value and the distance, and the signals output by the sensing electrodes 1021 in the fingerprint sensor corresponding to the peaks and the valleys are different. The signal output by the sensing electrode 1021 is converted into two-dimensional image data, so that the full-width or partial pattern of the fingerprint contacted with the fingerprint identification module can be obtained, the obtained pattern of the fingerprint is compared with the pattern stored in the fingerprint identification module in advance, if the two patterns are matched, the identity information of the tested person passes the authentication, and the subsequent operations such as sign-in and mobile phone unlocking can be performed.
The fingerprint recognition module is currently formed by using metal grids, and in order to avoid that the driving electrode 1022 and the sensing electrode 1021 affect the normal light emission of the sub-pixel 101, the driving electrode 1022 and the sensing electrode 1021 are arranged between the sub-pixels 101. The distance between the driving electrodes 1022 and the distance between the sensing electrodes 1021 are required to be matched with the distance 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 distance between the driving electrodes 1022 and the distance between the sensing electrodes 1021, so that the number of the electrodes is affected, and further the number of the pixel points in the fingerprint image acquired by the fingerprint identification module is affected. In the low PPI display panel, the distance between the driving electrodes 1022 and the distance between the sensing electrodes 1021 are both larger, so that the acquired fingerprint image has the problem that the fingerprint dpi (Dots Per Inch) is insufficient, the requirement that the fingerprint dpi is more than 500 cannot be met (the distance between the sensing electrodes is less than or equal to 50 um), and the accuracy of fingerprint identification is reduced.
In view of this, an embodiment of the present invention provides a display panel, fig. 2 is a schematic structural diagram of the display panel provided by the embodiment of the present invention, fig. 3 is a schematic structural diagram of another display panel provided by the embodiment of the present invention, fig. 4 is a schematic structural diagram of a first fingerprint identification layer provided by the embodiment of the present invention, and fig. 5 is a schematic structural diagram of a second fingerprint identification layer provided by the 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 bars 1 are sequentially arranged along the second direction Y, and the plurality of second sensing electrode bars 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 sensing signal; the first direction X and the second direction Y are intersected with each other; the first sensing electrode bars 1 include a plurality of first sensing electrodes 11 connected in series, that is, each first sensing electrode bar 1 includes a plurality of first sensing electrodes 11 sequentially arranged along the first direction X, and adjacent first sensing electrodes 11 are connected to each other, and, illustratively, 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, a plurality of second sensing electrodes 12 can be sequentially connected through metal wires or wide transparent electrode wires so as to realize 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 the vertical projection of the second fingerprint identification layer on the display substrate 100 and the vertical projection of the first fingerprint identification layer on the display substrate 100 have overlapping areas; each second fingerprint identification layer comprises a plurality of third sensing electrode bars 3 extending in a first direction X and a plurality of fourth sensing electrode bars 4 extending in a second direction Y; the third sensing electrode strips 3 are sequentially arranged along the second direction Y, and the fourth sensing electrode strips 4 are sequentially arranged along the first direction X; each third sense electrode strip 3 comprises a plurality of third sense electrodes 21 connected in series, and each fourth sense electrode strip 4 comprises a plurality of fourth sense electrodes 22 connected in series; 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, 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 sensing signal; in the same third sensing electrode strip 3, a plurality of third sensing electrodes 21 can be sequentially connected through metal wires or wide transparent electrode wires so as to realize series connection; in the same fourth sensing electrode strip 4, a plurality of fourth sensing electrodes 22 can be sequentially connected through metal wires or wide transparent electrode wires so as to realize series connection;
In the overlapping 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, the vertical projection of the third sensing electrode 21 and the vertical projection of the corresponding first sensing electrode 11 on the display substrate do not overlap, and/or the vertical projection of the fourth sensing electrode 22 and the vertical projection of the corresponding second sensing electrode 12 on the display substrate do not overlap.
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 on one side of the substrate in an array manner. The first direction X may be a row direction of the arrangement of subpixels in the display panel, and the second direction Y may be a column direction of the arrangement of subpixels in the display panel. The first direction X and the second direction Y may be perpendicular to each other. The vertical projection of the wires between two adjacent first sensing electrodes 11 along the first direction X on the display substrate 100 and the vertical projection of the wires between two adjacent second sensing electrodes 12 along the second direction Y on the display substrate 100 are arranged crosswise; the second sensing electrode 12 is electrically insulated from the first sensing electrode 11. Adjacent first and second sensing electrodes 11 and 12 may form one fingerprint capacitor 30. The first sensing electrode 11 is used for receiving the first fingerprint identification driving signal, and the second sensing electrode 12 is used for transmitting the first fingerprint identification sensing signal. That is, the IC for fingerprint recognition inputs a driving signal to the first sensing electrode 11, and when a finger of a subject contacts 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. The two adjacent first sensing electrodes 11 and the 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.
A vertical projection of a wire between two third sensing electrodes 21 adjacent in the first direction X on the display substrate and a vertical projection of a wire between two fourth sensing electrodes 22 adjacent in the second direction Y on the display substrate are disposed to intersect; the third sensing electrode 21 is electrically insulated from the fourth sensing electrode 22. Adjacent third and fourth sensing electrodes 21, 22 may form a 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 contacts the surface of the module, a fingerprint can be detected based on the signal mark 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 the second fingerprint identification sensing signal; a driving signal is inputted to the fourth sensing electrode 22 and when the finger of the subject contacts the surface of the module, a fingerprint can be detected according to a signal change by the third sensing electrode 21. The adjacent two third sensing electrodes 21 and the adjacent two fourth sensing electrodes 22 adjacent to both the adjacent two third sensing electrodes 21 may constitute one fingerprint detection unit 40.
The second fingerprint recognition layer is positioned on the same side of the display substrate 100 as the first fingerprint recognition layer, and a vertical projection of the second fingerprint recognition layer on the display substrate 100 and a vertical projection of the first fingerprint recognition layer on the display substrate 100 have overlapping areas. The overlapping area is that the whole film layer of the first fingerprint identification layer and the whole film layer of the second fingerprint identification layer have overlapping areas. The overlap region may be a partial region of the first fingerprint recognition layer or an entire region of the first fingerprint recognition 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 first sensing electrode 11 corresponding thereto do not overlap at least partially, which is understood to mean that the vertical projection of the third sensing electrode 21 on the display substrate and the vertical projection of the first sensing electrode 11 corresponding thereto partially overlap, or do not overlap. When not overlapping, the vertical projection of the third sensing electrode 21 on the display substrate is located between the vertical projection of the first sensing electrode 11 corresponding thereto 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 thereto do not overlap at least partially, which is understood to mean 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 thereto overlap partially or do not overlap. When not overlapping, the vertical projection of the fourth sensing electrode 22 on the display substrate is located between the vertical projection of the corresponding second sensing electrode 12 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 overlapping area, by setting that the vertical projection of the third sensing electrode 21 on the display substrate is at least partially not overlapped with the vertical projection of the first sensing electrode 11 on the display substrate, and/or that the vertical projection of the fourth sensing electrode 22 on the display substrate is at least partially not overlapped with the vertical projection of the second sensing electrode 12 on the display substrate, the fingerprint detection unit 40 in the second fingerprint identification layer is different from the fingerprint identification area of the fingerprint detection unit 40 in the first fingerprint identification layer, that is, 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 fingerprint identification detection points is increased, so that dpi of fingerprint images is increased, and the effects of increasing fingerprint identification resolution and fingerprint identification accuracy are achieved.
In addition, the area of the vertical projection of the second fingerprint identification layer on the display substrate may be equal to or different from the area of the vertical projection of the first fingerprint identification layer on the display substrate. The number of the third sensing electrode bars 3 and the number of the fourth sensing electrode bars 4 included in the second fingerprint layer may be the same as or different from the number of the first sensing electrode bars 1 and the number of the second sensing electrode bars 2 in the first fingerprint layer, respectively. The number of the third sensing electrodes 21 included in the third sensing electrode bar 3 may be the same as or different from the number of the first sensing electrodes 11 included in the first sensing electrode bar 1; the number of the fourth sensing electrodes 22 included in the fourth sensing electrode bar 4 may be the same as or different from the number of the first sensing electrodes 11 included in the second sensing electrode bar 2. One column of sub-pixels or a plurality of columns of sub-pixels can be arranged between two adjacent first sensing electrode strips 1; one or more rows of sub-pixels may be spaced between two adjacent second sensing electrode bars 2. A column of sub-pixels or a plurality of columns of sub-pixels can be arranged between two adjacent third sensing electrode strips 3; one or more rows of sub-pixels may be spaced between adjacent ones of the fourth sensing electrode bars 4. The arrangement density of the sensing electrodes in the first fingerprint identification layer is the same as the arrangement density 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 are 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 this 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 electrode in the first sensing electrode strip is used for receiving a first fingerprint identification driving signal, and the second sensing electrode in the second sensing electrode strip is used for sending a first fingerprint identification sensing signal; the first fingerprint identification layer is an on-screen capacitance fingerprint identification module; 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 the second fingerprint identification driving signal and sending the second fingerprint identification sensing signal. By setting the vertical projection of the third sensing electrode on the display substrate and the vertical projection of the first sensing electrode on the display substrate to be at least partially non-overlapped, and/or the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the second sensing electrode on the display substrate to be at least partially non-overlapped, the fingerprint detection units in the second fingerprint identification layer are different from the fingerprint identification areas of the fingerprint detection units in the first fingerprint identification layer, namely the fingerprint detection points determined by the second fingerprint identification layer are different from the fingerprint detection points determined by the first fingerprint identification layer, the number of the fingerprint detection points is increased, so that dpi of fingerprint images is increased, fingerprint identification resolution is increased, and fingerprint identification accuracy is improved.
Alternatively, referring to fig. 2 and 3, the third sensing electrodes 21 are in one-to-one correspondence with the first sensing electrodes 11, and the fourth sensing electrodes 22 are in one-to-one correspondence with the second sensing electrodes 12. On the basis, by setting that the vertical projection of the third sensing electrode 21 on the display substrate 100 and the vertical projection of the first sensing electrode 11 on the display substrate 100 are at least partially not overlapped, and/or the vertical projection of the fourth sensing electrode 22 on the display substrate 100 and the vertical projection of the second sensing electrode 12 on the display substrate 100 are at least partially not overlapped, the dpi of the fingerprint image determined by the double-layer fingerprint identification layer can be doubled compared with the fingerprint image acquired by the single-layer fingerprint identification layer, 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 area of the vertical projection of the third sensing electrode 21 on the display substrate 100 is located between two first sensing electrodes 11 adjacent in the first direction X; at least a partial area of the vertical projection of the fourth sensing electrode 22 on the display substrate 100 is located between two second sensing electrodes 12 adjacent in 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 offset from each other in the first direction X, and the second sensing electrode 12 and the fourth sensing electrode 22 are also offset from each other in the first direction X. If the pixel point in the fingerprint image collected by the first fingerprint identification layer is the first pixel point, the pixel point in the fingerprint image collected by the second fingerprint identification layer is the second pixel point; in the fingerprint image determined by combining the first fingerprint recognition layer with the second fingerprint recognition layer, the pixel points of each row comprise a first pixel point and a second pixel point in the first direction X, and the first pixel point and the second pixel point are sequentially alternated. That is, compared with the fingerprint image determined by the first fingerprint identification layer of a single layer, in the fingerprint image determined by the first fingerprint identification layer combined with the second fingerprint identification layer, one second pixel point is added between every two adjacent first pixel points in the first direction X, so that dpi of the fingerprint image is increased, and the effects of increasing fingerprint identification resolution and improving fingerprint identification accuracy are achieved.
In another embodiment of the present invention, referring to fig. 3, at least a partial area of the vertical projection of the third sensing electrode 21 on the display substrate 100 is located between the adjacent first sensing electrodes 11 along the second direction Y; at least a partial area of the vertical projection of the fourth sensing electrode 22 on the display substrate 100 is located between the second sensing electrodes 12 adjacent in the second direction Y. It can be understood that the first sensing electrode 11 and the third sensing electrode 21 are disposed offset from each other 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. The number of pixels is increased in the second direction Y in the fingerprint image determined by the first pattern recognition layer in combination with the second pattern recognition layer with respect to the fingerprint image determined by the first pattern recognition layer of the single layer. Thereby increasing dpi of the fingerprint image and achieving the effects of increasing resolution of fingerprint identification and improving accuracy of fingerprint identification.
Optionally, the boundaries of the vertical projection of the third sensing electrode 21 and the first sensing electrode 11 corresponding thereto on the display substrate 100 all encircle the same sub-pixel group;
The boundaries of the vertical projection of the fourth sensing electrode 22 and the corresponding second sensing electrode 12 on the display substrate 100 encircle the same sub-pixel group; wherein each subpixel group comprises at least one subpixel.
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. The number of the sub-pixels corresponding to each sensing electrode can be one or a plurality of the sub-pixels according to actual needs. The two sensing electrodes corresponding to each other surround the same sub-pixel group at the vertical projection boundary on the display substrate 100, so that the two sensing electrodes corresponding to each other form a double-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 double ring nested structure. The number of fingerprint detection points is increased while the difference between fingerprint detection units in the second fingerprint identification layer and fingerprint identification areas of the fingerprint detection units in the first fingerprint identification layer can be ensured, the total area of the sensing electrode in the first fingerprint identification layer and the sensing electrode in the second fingerprint identification layer occupied by the display substrate 100 can be reduced, and the difficulty in corresponding matching of the sensing electrode and the sub-pixel group can be reduced.
Optionally, fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 6, a vertical projection of a third sensing electrode 21 on a display substrate 100 is equal to a distance between two nearest first sensing electrodes 11 on the display substrate 100; the distance between the vertical projection of the fourth sensing electrode 22 on the display substrate 100 and the vertical projection 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 recognition layer are offset in the first direction X relative to the sensing electrodes in the first fingerprint recognition layer (as shown in fig. 6), 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 first sensing electrode on the display substrate 100 in the first direction X; 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 nearest 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 of fig. 6 does not overlap. Since the third sensing electrode 21 and the first sensing electrode 11 may be provided 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 projections 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, and the exemplary illustration of fig. 6 does not overlap. Because the fourth sensing electrode 22 and the second sensing electrode 12 may be provided in different layers, there is no short between the fourth sensing electrode 22 and the second sensing electrode 12 when overlapped.
If the sensing electrode in the second fingerprint recognition layer is shifted to the second direction Y (not shown) relative to the sensing electrode in the first fingerprint recognition layer, then in the second direction Y, the intermediate position between 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; the fourth sensing electrode 22 is positioned midway between the vertical projection on the display substrate 100 and the vertical projection of the two second sensing electrodes 12 nearest thereto on the display substrate 100. The pixel points in the fingerprint image determined by combining the second fingerprint identification layer with the first fingerprint identification layer can be uniformly distributed, so that the fingerprint characteristics can be analyzed conveniently, and the fingerprint identification accuracy 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 is disposed in the same layer as the fourth sensing electrode 22, the third sensing electrode 21 is disposed in the same layer as the second sensing electrode 12, and the third sensing electrode 21 is disposed in a different layer from the fourth sensing electrode 22.
Or FIG. 8 is another cross-sectional view of the structure of FIG. 2 taken along line AA1, with reference to FIGS. 8 and 2, with the first sense electrode 11 and the second sense electrode 12 being co-layered; the third and fourth sensing electrodes 21 and 22 are disposed in the same layer, and the first and third sensing electrodes 11 and 21 are disposed in different layers.
Specifically, the two sensing electrodes disposed on the same layer may be understood as two sensing electrodes disposed on the surface of the same film layer, and two sensing electrodes having overlapping portions in vertical projection on the display substrate 100 may not be disposed on the same layer. The arrangement manner of the sensing electrodes in the two fingerprint recognition layers may be that, referring to fig. 7, the two sensing electrodes in the same fingerprint recognition layer are arranged on the surfaces of the two film layers, that is, the first sensing electrode 11 and the second sensing electrode 12 in the first fingerprint recognition layer are arranged in different layers, and meanwhile, the third sensing electrode 21 and the fourth sensing electrode 22 in the second fingerprint recognition layer are arranged in different layers, at this time, the first sensing electrode 11 and the fourth sensing electrode 22 are arranged in the same layer, and the third sensing electrode 21 and the second sensing electrode 12 are arranged in the same layer. Or referring to fig. 8, two sensing electrodes in the same fingerprint recognition layer are both disposed on the surface of one film layer, and sensing electrodes of different fingerprint recognition layers are located on the surfaces of different film layers. I.e. 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 in the same layer, and the first and third sensing electrodes 11 and 21 are disposed in different layers. The four sensing electrodes in the first fingerprint identification layer and the second fingerprint identification layer are equally divided on the two film layers, so that the number of the sensing electrodes contained in the same film layer can be reduced, and a sufficient dislocation space can be reserved for dislocation arrangement of the sensing electrodes in the second fingerprint identification layer relative to the sensing electrodes in the first 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 are not all overlapped, the first and third sensing electrodes 11 and 21 may be disposed in the same layer. For the second and fourth sensing electrodes 12 and 22, when the vertical projections of the second and fourth sensing electrodes 12 and 22 on the display substrate 100 do not all overlap, the second and fourth sensing electrodes 12 and 22 may be disposed in the same layer.
Optionally, fig. 9 is a schematic structural view of another display panel provided in an embodiment of the present invention, and fig. 10 is a schematic structural view of another display panel provided in an embodiment of the present invention, and referring to fig. 9 and fig. 10, a display substrate includes a pixel light emitting region and a non-light emitting region between adjacent pixel light emitting regions; wherein each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the metal ring does not overlap the pixel light emitting region.
Specifically, the display substrate includes a substrate 102 and a light emitting layer disposed on the substrate 102; the luminous layer is positioned at one side of the substrate 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 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 perpendicular projection of the metal ring on the light emitting layer does not overlap the sub-pixel 101. Or the sensing electrode may comprise a metal ring and a transparent conductive block located within the metal ring. Or each sensing electrode in the two fingerprint identification layers can be a transparent conductive block, so that the problem that the sensing electrode affects the light emitting of the sub-pixel 101 can be solved. The material of the transparent conductive block may be, for example, ITO. In addition, the connection lines between the sensing electrodes may be transparent conductive materials to avoid the influence of the connection lines on the light emission of the sub-pixels 101.
When the sensing electrode is a metal ring, namely the first fingerprint identification layer and the second fingerprint identification layer are formed by adopting metal grids. In order to avoid that the sensing electrode of the metal grid structure affects 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 metal ring-shaped first sensing electrode 11 and the metal ring-shaped third sensing electrode 21 may form a double-ring nested structure, and the metal ring-shaped second sensing electrode 12 and the metal ring-shaped fourth sensing electrode 22 may form a double-ring nested structure. The sub-pixels 101 include 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 illustrates that each sensing electrode corresponds to one sub-pixel 101, and the number of 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 under the condition that one sensing electrode corresponds to 4 sub-pixels 101, the dpi of the fingerprint image can still be improved by adopting double-ring nesting.
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, where the touch layer is located on one side of the display substrate 100; the touch layer 200 includes a fingerprint recognition area 201; the touch layer of the fingerprint recognition area 201 is multiplexed as a first fingerprint recognition layer or a second fingerprint recognition layer.
Specifically, the touch layer of the fingerprint identification area 201 is multiplexed into the first fingerprint identification layer or the second fingerprint identification layer, so that the touch layer 200 of the fingerprint identification area 201 can perform fingerprint identification during fingerprint identification, one fingerprint identification layer is reduced, and the thickness and cost of the display panel can be reduced. Wherein the fingerprint recognition 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 positioned on at least one of the 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 film encapsulation layer 300, the polarizer 400, and the cover plate 500.
Specifically, the first sensing electrode 11 and the second sensing electrode 12 may be located on the same film layer among 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 among the thin film encapsulation layer 300, the polarizer 400, and the cover plate 500, respectively. The third and fourth sensing electrodes 21 and 22 may be located on the same film layer in the thin film encapsulation layer 300, the polarizer 400, and the cover plate 500, or the third and fourth sensing electrodes 21 and 22 may be located on different film layers in 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 film encapsulation layer 300, and the second sensing electrode 12 is located between the cover plate 500 and the polarizer 400; the third sensing electrode 21 and the fourth sensing electrode 22 are respectively positioned on the two film layers, the third sensing electrode 21 is positioned between the cover plate 500 and the polarizer 400, and the fourth sensing electrode 22 is positioned between the polarizer 400 and the film encapsulation layer 300. In fig. 8, the first sensing electrode 11 and the second sensing electrode 12 are exemplarily shown on the upper surface of the thin film encapsulation layer 300; the third sensing electrode 21 and the fourth sensing electrode 22 are both positioned on the upper surface of the polarizer 400. Because the film packaging layer, the polaroid and the cover plate are all film layers of insulating materials in the display panel, the sensing electrodes can be electrically insulated by utilizing the insulativity of the film layers, and the insulating film layers are not required to be arranged between the sensing electrodes of the two layers independently, so that the thickness of the display panel can be reduced, and the cost of the display panel is reduced.
Alternatively, referring to fig. 12 and 13, each first sensing electrode 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 the adjacent two first sensing electrodes 11 are connected in one-to-one correspondence; in the second direction Y, the second sub-electrodes 120 at the same position in the adjacent two second sensing electrodes 12 are connected in one-to-one correspondence; where n is an integer greater than or equal to 2 (the structure when n is 2 is exemplarily drawn in fig. 12 and 13). The first sensing electrode 11 and the second sensing electrode 12 may be transparent conductive blocks to avoid the influence of the metal ring-shaped sensing electrode on the luminescence of the sub-pixels after being divided into sub-electrodes.
Referring to fig. 12, each of the first sub-electrodes 110 in the first sensing electrode 11 may be used as an electrode (RX) for receiving a first fingerprint recognition driving signal, and each of the second sub-electrodes 120 in the second sensing electrode 12 may be used as an electrode (TX) for transmitting a first fingerprint recognition sensing signal. Or referring to fig. 13, a part of the first sub-electrodes 110 in the first sensing electrode 11 are taken as electrodes (RX) for receiving the first pattern recognition driving signal, and a part of the first sub-electrodes 110 are taken as electrodes (TX) for transmitting the first pattern recognition sensing signal; a part of the second sub-electrodes 120 in the second sensing electrode are used as electrodes for transmitting the first pattern recognition sensing signal, and a part of the first sub-electrodes 120 in the second sensing electrode 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 position 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 electrically connected end to end in sequence to form one electrode strip, i.e., each first sensing electrode strip can be divided into a plurality of electrode strips extending along the first direction X. For example, referring to fig. 12 and 13, the first sensing electrode bar is divided into two electrode bars. 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 manner, so that in each second sensing electrode strip, one electrode strip can be formed by sequentially connecting the first sub-electrodes 120 arranged along the second direction Y end to end, i.e. each second sensing electrode strip can be divided into a plurality of electrode strips. For example, referring to fig. 12 and 13, the second sensing electrode bar is divided into two electrode bars. And the number of electrode bars used for receiving the first fingerprint identification driving signals in the first fingerprint identification layer is doubled, the number of electrode bars used for sending the first fingerprint identification sensing signals in the first fingerprint identification layer is doubled, and the number of fingerprint identification detection points in the unit area of the first fingerprint identification layer is increased, so that dpi of fingerprint images is increased, and the effects of increasing fingerprint identification resolution and improving fingerprint identification accuracy are achieved.
Optionally, each third sensing electrode comprises m third sub-electrodes electrically insulated from each other; each fourth sensing electrode comprises m fourth sub-electrodes electrically insulated from each other; third sub-electrodes at the same position in two adjacent third sensing electrodes are connected in a one-to-one correspondence manner in the first direction X; in the second direction Y, fourth sub-electrodes at the same position in two adjacent fourth sensing electrodes are connected in a one-to-one correspondence manner; wherein m is an integer greater than or equal to 2. The number of fingerprint identification detection points in the unit area of the second fingerprint identification layer can be increased, so that dpi of the 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 have the same shape and size, and the fourth sensing electrode and the second sensing electrode have the same shape and size, so that the manufacturing process of the display panel can be simplified. Wherein the shape of the sensing electrode may include 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.
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 a display panel according to any of the foregoing embodiments, and a display area of the display panel includes a fingerprint identification area 201. Has the same technical effects and is not described in detail herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (11)
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 bars includes a plurality of first sensing electrodes connected in series, and each of the second sensing electrode bars includes 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 intersected with each other;
the second fingerprint identification layer is positioned on the same side of the display substrate as the first fingerprint identification layer, and the vertical projection of the second fingerprint identification layer on the display substrate and the vertical projection of the first fingerprint identification layer on the display substrate have overlapping areas; the second fingerprint identification layer comprises a plurality of third sensing electrode bars extending along the first direction and a plurality of fourth sensing electrode bars extending along the second direction; the third sensing electrode strips are sequentially arranged along the second direction, and the fourth sensing electrode strips are sequentially arranged along the first 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 is used for receiving a second fingerprint identification driving signal, the fourth sensing electrode is used for sending a second fingerprint identification sensing 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 sensing 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 not overlapped, 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 not overlapped;
two adjacent third sensing electrodes and two fourth sensing electrodes adjacent to the two adjacent third sensing electrodes form a fingerprint detection unit.
2. The display panel of claim 1, wherein the display panel comprises,
At least a 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 a 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 a partial area of a vertical projection of the third sensing electrode on the display substrate is located between the first sensing electrodes adjacent along the second direction; at least a partial area of the vertical projection of the fourth sensing electrode on the display substrate is positioned between the second sensing electrodes adjacent along the second direction.
3. The display panel of claim 1, wherein the display panel comprises,
The boundaries of the vertical projection of the third sensing electrode and the first sensing electrode corresponding to the third sensing electrode on the display substrate encircle the same sub-pixel group;
the boundaries of the vertical projection of the fourth sensing electrode and the second sensing electrode corresponding to the fourth sensing electrode on the display substrate encircle the same sub-pixel group; wherein each of the sub-pixel groups includes at least one sub-pixel.
4. The display panel of claim 1, wherein the display panel comprises,
The vertical projection of the third sensing electrode on the display substrate is equal to the distance between the vertical projections of the two nearest first sensing electrodes on the display substrate;
The distance between the vertical projection of the fourth sensing electrode on the display substrate and the vertical projection of the two nearest second sensing electrodes on the display substrate is equal.
5. The display panel of claim 1, wherein the display panel comprises,
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 on the same layer; the third sensing electrode and the fourth sensing electrode are disposed in the same layer, and the first sensing electrode and the third sensing electrode are disposed in different layers.
6. The display panel of claim 1, wherein the display substrate includes a pixel light emitting region and a non-light emitting region between adjacent pixel light emitting regions;
wherein each sensing electrode in the two fingerprint identification layers comprises a metal ring and/or a transparent conductive block; the metal ring does not overlap the pixel light emitting region.
7. The display panel of claim 6, further comprising a touch layer located on one side of the display substrate;
The touch control layer comprises a fingerprint identification area; the touch control layer of the fingerprint identification area is multiplexed into the first fingerprint identification layer or the second fingerprint identification layer.
8. 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 among the film packaging layer, the polaroid and the cover plate;
the third sensing electrode and the fourth sensing electrode are located on at least one of the film packaging layer, the polaroid and the cover plate.
9. The display panel of claim 1, wherein the display panel comprises,
Each first sensing electrode comprises n first sub-electrodes electrically insulated from each other; each of the second sensing electrodes includes n second sub-electrodes electrically insulated from each other; in the first direction, the first sub-electrodes at the same position in two adjacent first sensing electrodes are connected in a one-to-one correspondence manner; 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 comprises m third sub-electrodes electrically insulated from each other; each of the fourth sensing electrodes includes 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 connected in a one-to-one correspondence manner; wherein m is an integer greater than or equal to 2.
10. The display panel of claim 1, wherein the third sensing electrodes are in one-to-one correspondence with the first sensing electrodes, and the fourth sensing electrodes are in one-to-one correspondence with the second sensing electrodes;
The third sensing electrode and the first sensing electrode are identical in shape and size, and the fourth sensing electrode and the second sensing electrode are identical in shape and size.
11. A display device comprising the display panel of any one of claims 1-10.
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