CN110991396B - Display panel, display device and fingerprint identification method - Google Patents
Display panel, display device and fingerprint identification method Download PDFInfo
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- CN110991396B CN110991396B CN201911302783.8A CN201911302783A CN110991396B CN 110991396 B CN110991396 B CN 110991396B CN 201911302783 A CN201911302783 A CN 201911302783A CN 110991396 B CN110991396 B CN 110991396B
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- 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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- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/30—Noise filtering
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- 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
- G06V40/1347—Preprocessing; Feature extraction
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Abstract
The invention discloses a display panel, a display device and a fingerprint identification method. The display panel includes: the system comprises a plurality of sensor units arranged in an array and a plurality of signal acquisition lines; the signal acquisition line is parallel to the column direction of the array; the plurality of sensor units form a multi-column sensor unit group; the sensor units in the same column are positioned in the same sensor unit group; the multiple rows of sensor unit groups correspond to the multiple signal acquisition lines one by one; the multi-column sensor unit group comprises at least one column of dummy sensor unit groups; the other sensor unit groups are fingerprint identification sensor unit groups; the signal acquisition line corresponding to the dummy sensor unit group is a first signal acquisition line; the signal acquisition line corresponding to the fingerprint identification sensor unit group is a second signal acquisition line; the output end of each sensor unit of the dummy sensor unit group is disconnected with the first signal acquisition line; the output end of the fingerprint identification sensor unit group is electrically connected with the second signal acquisition line. The display panel improves the accuracy of fingerprint identification.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a display device and a fingerprint identification method.
Background
Currently, a Liquid Crystal Display (LCD) panel and an Organic Light Emitting Diode (OLED) Display panel are commonly used as a Display panel, the LCD panel is a passive Display panel, a backlight module is required to provide a backlight source for the passive Display panel to Display a picture, and the OLED Display panel is an active Display panel, which can receive excitation of electrons or photons to emit Light to Display the picture. The fingerprint identification technology is the most widely applied one of the biological characteristic identification technologies, and is integrated in a display screen of an intelligent terminal, so that the functions of intelligent unlocking, online payment and the like can be realized.
Fingerprint identification's display panel in integrated screen of prior art mainly digs the hole in black matrix region to set up the fingerprint identification sensor in the projection region of trompil perpendicular to base plate, the light beam that the fingerprint identification sensor received finger reflection produces the signal of telecommunication, detects out fingerprint information then, but because the line of walking of current display area design is intensive, walk the line signal coupling interference and can cause fingerprint identification sensor detection noise big, influence fingerprint identification's accuracy.
Disclosure of Invention
The invention provides a display panel, a display device and a fingerprint identification method, which aim to improve the accuracy of fingerprint identification.
In a first aspect, an embodiment of the present invention provides a display panel, including:
the system comprises a plurality of sensor units arranged in an array and a plurality of signal acquisition lines; the signal acquisition line is parallel to the column direction of the array; the sensor units form a multi-column sensor unit group; the sensor units in the same column are positioned in the same sensor unit group; the multiple rows of sensor unit groups correspond to the multiple signal acquisition lines one by one;
the sensor unit groups in multiple columns comprise at least one column of dummy sensor unit groups; the sensor unit groups in other rows are fingerprint identification sensor unit groups; the signal acquisition lines which correspond to the dummy sensor unit groups one by one are first signal acquisition lines; the signal acquisition lines which correspond to the fingerprint identification sensor unit groups one by one are second signal acquisition lines; the output ends of the sensor units of the dummy sensor unit group are disconnected from the first signal acquisition lines which correspond to one another one by one; the output end of the fingerprint identification sensor unit group is electrically connected with the second signal acquisition lines in one-to-one correspondence.
In a second aspect, an embodiment of the present invention provides a display device, including:
the display panel of any one of the first to the second aspects.
In a third aspect, an embodiment of the present invention provides a fingerprint identification method, which is applied to any one of the display devices provided in the second aspect, and the method includes:
acquiring a first acquisition signal of the dummy sensor unit group and a second acquisition signal of the fingerprint identification sensor unit group;
and determining the de-noising acquisition signal of the fingerprint identification sensor unit group according to the first acquisition signal and the second acquisition signal.
According to the technical scheme provided by the embodiment of the invention, a plurality of rows of fingerprint identification sensor unit groups and at least one row of dummy sensor unit groups are arranged, the output ends of the sensor units of the dummy sensor unit groups are disconnected with the first signal acquisition lines in one-to-one correspondence, and the output ends of the fingerprint identification sensor unit groups are electrically connected with the second signal acquisition lines in one-to-one correspondence. Because the first signal acquisition line is disconnected with the output end of each sensor unit of the nominal sensor unit group, the first acquisition signal acquired by the first signal acquisition line is only circuit noise, and the second signal acquisition line is electrically connected with the output ends of each sensor unit of the fingerprint identification sensor unit group in a one-to-one correspondence manner. The second acquisition signal acquired by the second signal acquisition line thus contains both a valid fingerprint signal and circuit noise. The first acquisition signal is used as a noise background signal, the second acquisition signal subtracts the first acquisition signal to determine a de-noising acquisition signal of the fingerprint identification sensor unit group, and finally fingerprint information is determined according to the de-noising acquisition signal, so that the accuracy of fingerprint identification is improved.
Drawings
In order to more clearly illustrate the technical solution of the exemplary embodiment of the present invention, a brief introduction will be made to the drawings required for describing the embodiment. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sensor unit according to an embodiment of the present invention;
fig. 3 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic partial cross-sectional view of a display panel according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating a fingerprint identification method according to an embodiment of the present invention;
FIG. 12 is a flowchart illustrating another fingerprint identification method according to an embodiment of the present invention;
fig. 13 is a flowchart illustrating a fingerprint identification method according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
Fig. 1 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention. Referring to fig. 1, a display panel 100 according to an embodiment of the present invention includes: a plurality of sensor units 111 arranged in an array and a plurality of signal acquisition lines; the signal acquisition lines are parallel to the row direction of the array, the sensor units 111 form a plurality of rows of sensor unit groups, the sensor units 111 in the same row are located in the same sensor unit group, and the plurality of rows of sensor unit groups correspond to the signal acquisition lines one by one.
The multi-column sensor cell group includes at least one column dummy sensor cell group 110a; the other sensor unit groups are fingerprint identification sensor unit groups 110b; the signal acquisition lines corresponding to the dummy sensor cell groups 110a one-to-one are first signal acquisition lines 120a; the signal acquisition lines corresponding to the fingerprint identification sensor cell group 110b one to one are second signal acquisition lines 120b; the output ends of the sensor cells 111 of the dummy sensor cell group 110a are disconnected from the first signal collection lines 120a corresponding to one another; the output ends of the fingerprint identification sensor unit groups 110b are electrically connected with the second signal acquisition lines 120b corresponding to one another.
As illustrated in fig. 1, the display panel 100 illustratively includes: the sensor units 111 and 6 signal collection lines are arranged in a 5 × 6 array, the signal collection lines are parallel to the column direction (Y direction in the figure) of the sensor units 111, each column of sensor units 111 forms a column of sensor unit groups, in other embodiments, each two or more columns of sensor units 111 form a column of sensor unit groups, and each column of sensor unit groups has one signal collection line corresponding to it.
It should be noted that the sensor units 111 may be arranged in an M × N array, and this embodiment is only exemplary and does not limit the number of the sensor units 111 in the row direction and the column direction.
The specific structure of the sensor unit may be various in actual arrangement. The sensor unit with different structures, which has slightly different operation principles, will be described in detail with reference to the following exemplary example, but is not intended to limit the present application. Fig. 2 is a schematic structural diagram of a sensor unit according to an embodiment of the present invention. As shown in fig. 2, the sensor unit includes a photo sensor D, a capacitor C and a transistor Q, a first end of the photo sensor D is connected to a first end of the capacitor C and a first end of the transistor Q, a second end of the photo sensor T is connected to a second end of the capacitor C, a second end of the transistor Q is connected to the signal collecting line 121, and a control end of the transistor Q is connected to the scanning line 131.
When a finger is placed in the sensing area on the display panel, the ridge in the finger is in contact with the surface of the display panel, the valley is not in contact with the surface of the display panel, light irradiates the valley and the ridge of the finger to form reflected light, the reflected light enters the photoelectric sensor, and the photoelectric sensor receives the reflected light (fingerprint signal light) and generates an electric signal related to the reflected light. Because of the ridges and valleys on the finger, the intensity of the light reflected by different positions of the fingerprint is different, and finally, the intensity of the light received by different photoelectric sensors is different. And under different light intensity, the electric signals fed back by the photoelectric sensor are different. Therefore, the fingerprint characteristics of the finger can be obtained through the magnitude of the electric signals fed back by each photoelectric sensor, and the fingerprint identification function is realized.
Because the circuits and the wires in the display panel are densely arranged, the fingerprint identification sensor unit can be interfered by other circuits and wires in the display panel, for example, the pixel driving circuit and the data lines in the display panel are coupled with the fingerprint identification sensor unit to generate circuit noise, and the accuracy of fingerprint identification can be influenced by the noise signals, so that the fingerprint signals acquired by calculating according to the signals acquired by the fingerprint identification sensor unit are inaccurate.
According to the embodiment of the present invention, at least one row of dummy sensor cell groups 110a is disposed. The output ends of the sensor cells 111 of the dummy sensor cell group 110a are disconnected from the first signal collection lines 120a corresponding to one another; the output ends of the fingerprint identification sensor unit groups 110b are electrically connected with the second signal acquisition lines 120b in one-to-one correspondence. Since the first signal collection line 120a is disconnected from the output terminals of the sensor cells 111 of the dummy sensor cell group 110a, the first collection signal collected by the first signal collection line 120a is only circuit noise. The circuit noise in the first collected signal includes, for example, a data line in the display panel for providing a data signal to each pixel unit, a pixel driving circuit for driving each pixel unit, and the like, and a coupling interference signal generated by the dummy sensor unit group 110a. The second signal collecting lines 120b are electrically connected to the output terminals of the sensor units 111 of the fingerprint recognition sensor unit group 110b in a one-to-one correspondence. The second collected signal collected by the second signal collection line 120b therefore contains both a valid fingerprint signal and circuit noise. The driving chip of the display panel may use the first collecting signal as a noise background signal, so the de-noising collecting signal of the fingerprint identification sensor unit group may be determined according to the first collecting signal collected by the first signal collecting line 120a and the second collecting signal collected by the second signal collecting line 120b, for example, the de-noising collecting signal may be obtained by subtracting the first collecting signal from the second collecting signal, or when a plurality of first collecting signals are collected, the median value or the average value of the plurality of first collecting signals may be used as the noise background signal, the de-noising collecting signal may be obtained by subtracting the noise background signal from the second collecting signal, and the fingerprint information may be finally determined according to the de-noising collecting signal, thereby improving the accuracy of fingerprint identification.
Fig. 3 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention. Referring to fig. 3, the display area of the display panel includes a middle region 141, and edge regions 142a and 142b located at both sides of the middle region 141 in the row direction of the array; the edge areas 142a and 142b and the middle area 141 are each provided with at least one column of the dummy sensor cell group 110a.
Illustratively, as shown in fig. 3, along the row direction (X direction in the figure) of the array, the areas of the middle area 141 near the two opposite side edges of the display area are edge areas 142a and 142b, respectively, where the edge area 142a is disposed in the area of the display area near the left side boundary, the edge area 142b is disposed in the area of the display area near the right side boundary, and the edge areas 142a and 142b and the middle area 141 are each disposed with a column of dummy sensor cell groups 110a.
Each row of sensor unit groups is interfered by circuits and wires around the sensor unit groups, and the closer the circuits and wires are to the row of sensor unit groups, the higher the circuit noise generated by the row of sensor unit groups. If the distance between the circuit and the trace in the display panel and the sensor unit group reaches a certain value, the interference of the circuit and the trace to the sensor unit group can be ignored, and the distance can be set to L, for example.
Referring to fig. 3, the sensor unit groups in the edge area 142a are interfered by the circuits and traces in the edge area 142a, and are also interfered by the circuits and traces within the range of the distance L on the right side thereof. The sensor cell group in the edge region 142b is interfered by the circuits and traces in the edge region 142b, and is also interfered by the circuits and traces within the distance L on the left side thereof. The sensor cell group in the middle area 141 is interfered by circuits and traces within a distance L on the left and right sides thereof. Therefore, the sensor cell groups located in the middle region 141 are subjected to a large noise interference, and the sensor cell groups located in the edge regions 142a and 142b are subjected to a small noise interference. Therefore, in the embodiment of the present invention, at least one row of dummy sensor unit groups 110a is disposed in each of the edge areas 142a and 142b and the middle area 141, the first signal collection lines 120a in the edge areas 142a and 142b collect noise signals in the edge areas 142a and 142b, and the first signal collection lines 120a in the middle area 141 collect noise signals in the middle area 141, so that more accurate noise signals can be obtained for different areas, and the accuracy of fingerprint identification can be further improved.
In other embodiments, the edge regions 142a and 142b and the middle region 141 may further include a plurality of rows of dummy sensor cell groups 110a, which is not limited in the embodiment of the present invention.
Optionally, with continued reference to fig. 1, the distance between any two adjacent columns of dummy sensor cell groups 110a is equal.
Illustratively, as shown in fig. 1, a distance between the first and second columns of dummy sensor cell groups 110a and 110a is d12, a distance between the second and third columns of dummy sensor cell groups 110a and 110a is d23, and d12= d23.
Specifically, in the whole display area, the distances between any two adjacent columns of the dummy sensor unit groups 110a are equal, that is, the dummy sensor unit groups 110a are uniformly distributed in the whole display area, so that the first signal acquisition lines 120a can be uniformly distributed in the whole display area to acquire noise signals at each area of the whole display area, thereby avoiding the occurrence of errors in the noise signal calculation of the display panel caused by too large differences of the noise signals at different areas.
Optionally, with continued reference to fig. 1, the dummy sensor cell groups 110a are arranged in a circular array with a spacing between the fingerprint sensor cell groups 110b.
Illustratively, as shown in fig. 1, the first column of sensor cell groups is a first column of dummy sensor cell groups 110a, the second column of sensor cell groups is a first column of fingerprint identification sensor cell groups 110b, the third column of sensor cell groups is a second column of dummy sensor cell groups 110a, the fourth column of sensor cell groups is a second column of fingerprint identification sensor cell groups 110b, the fifth column of sensor cell groups is a third column of dummy sensor cell groups 110a, and the sixth column of sensor cell groups is a third column of fingerprint identification sensor cell groups 110b. In another embodiment, the sensor cell groups in the first column may be the fingerprint sensor cell group 110b in the first column, and the sensor cell groups in the second column may be the dummy sensor cell group 110a in the first column, and the sensor cell groups in the first column may be arranged in a circular manner.
Since the noise signal sensed by the fingerprint sensor cell group 110b is similar to the noise signal sensed by the sensor cell group on the left or right side, a row of dummy sensor cell groups 110a may be disposed on each of the left and right sides of the fingerprint sensor cell group 110b, and the dummy sensor cell groups 110a and the fingerprint sensor cell groups 110b may be arranged in the display area at intervals. When the fingerprint signals of the sensor units of the row of fingerprint identification sensor unit group 110b are calculated, the determined denoising acquisition signals are more accurate on the basis of the first acquisition signals acquired by the first signal acquisition lines corresponding to the dummy sensor unit groups 110a on the left and right sides of the row of fingerprint identification sensor unit group, and the accuracy of fingerprint identification is improved.
Optionally, fig. 4 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 4, the display panel 100 further includes a substrate 150 and a plurality of pixel units 160 arranged in an array and located on the substrate 150; a black matrix 170 is arranged in the area between the adjacent pixel units 160, and the film layer where the black matrix 170 is located on one side of the sensor unit 111, which is away from the substrate base plate 150; the sensor unit 111 is positioned between two adjacent columns of pixel units 160; and the sensor unit 111 is positioned between two adjacent rows of pixel units 160. The black matrix 170 is provided with an opening 171, and a perpendicular projection of the opening 171 on the substrate base 150 at least partially overlaps the sensor unit 111. The black matrix 170 is disposed between the adjacent pixel units 160 for shielding the metal traces and circuits between the adjacent pixel units 160. In order to avoid the sensor unit 111 occupying the opening of the pixel unit, the sensor unit 111 is disposed in the area where the black matrix 170 is located. Since the light is irradiated to the finger and reflected, and then enters the sensor unit 111, the black matrix 170 is provided with an opening 171, so that the light reflected by the finger can enter the sensor unit 111. In addition, light reflected by different positions of the finger may be irradiated onto the same sensor unit 111, for example, light reflected by the ridge and the adjacent valley of the finger may be irradiated onto the same sensor unit 111, so that the sensor unit 111 receiving the light cannot detect the accurate position of the ridge and the valley of the fingerprint, which causes a serious crosstalk phenomenon in the fingerprint identification process and affects the accuracy and precision of the fingerprint identification of the sensor unit 111. Therefore, the opening 171 can also serve as a collimating hole, and by adjusting the size of the opening 171 to "screen" the fingerprint signal light, light reflected to the same sensor unit via different positions of the finger can be selectively filtered, so that only light reflected from the same position of the finger can be incident to the same sensor unit.
Illustratively, as shown in fig. 4, the sensor unit 111 is disposed between two adjacent columns of pixel units 160; the sensor unit 111 is located between two adjacent rows of pixel units. The perpendicular projection of the exemplary sensor unit 111 of fig. 4 onto the substrate base 150 is located within the perpendicular projection of the opening 171 onto the substrate base 150. In other embodiments, the relative positions of the opening 171 and the sensor unit 111 may be adjusted according to the actual design requirement of the display panel, so as to ensure that the vertical projection of the opening 171 on the substrate base 150 and the vertical projection of the sensor unit 111 on the substrate base 150 at least partially overlap. In other embodiments, the sensor unit 111 may be disposed only between two adjacent rows of pixel units 160, as shown in fig. 5; or the sensor unit 111 may be disposed only between two adjacent columns of pixel units 160, as shown in fig. 6. Fig. 5 is a partial schematic structure diagram of another display panel according to an embodiment of the present invention, and fig. 6 is a partial schematic structure diagram of another display panel according to an embodiment of the present invention.
If the sensor unit 111 is located between two adjacent columns of pixel units 160 or between two adjacent rows of pixel units 160; each dummy sensor cell group 110a and each fingerprint recognition sensor cell group 110b may each include a column of sensor cells 111, as shown in fig. 5 or 6.
Alternatively, the sensor units 111 are located between two adjacent columns of pixel units 160 and between two adjacent rows of pixel units 160. The display panel 100 further includes a plurality of fingerprint identification scan lines 181, and the fingerprint identification scan lines 181 are parallel to the row direction of the array. The fingerprint identification scan line 181 is used to provide a scan signal to the sensor units 111 connected to the fingerprint identification scan line, so that the array of sensor units 111 is turned on row by row.
The sensor units 111 between the pixel units 160 in the ith row and the pixel units 160 in the (i + 1) th row and the sensor units 111 between the adjacent pixel units 160 in the ith row are connected with the same fingerprint identification scanning line 181.
Alternatively, the sensor units 111 between the pixel units 160 in the ith row and the pixel units 160 in the (i + 1) th row and the sensor units 111 between the adjacent pixel units 160 in the (i + 1) th row are connected with the same fingerprint identification scan line 181.
Wherein i is a positive integer of 1 or more.
Illustratively, as shown in fig. 4, the pixel units 160 are arranged in a 5 × 4 array, the fingerprint identification scan lines 181 are parallel to the row direction (X direction in the figure) of the array, and the sensor units 111 between the pixel units 160 in the ith row and the pixel units 160 in the (i + 1) th row and the sensor units 111 between the pixel units 160 in the ith row of the pixel units 160 are connected to the same fingerprint identification scan line 181. For example, the sensor cells 111 between the first row of pixel cells 160 and the second row of pixel cells 160 and the sensor cells 111 between adjacent pixel cells 160 in the first row of pixel cells 160 connect the same fingerprint identification scan line 181. In other embodiments, the sensor units 111 between the pixel units 160 in the ith row and the pixel units 160 in the (i + 1) th row and the sensor units 111 between the pixel units 160 in the (i + 1) th row may be connected to the same fingerprint identification scan line 181.
The connection mode of the fingerprint identification scanning lines provided by the embodiment of the invention enables each two rows of sensor units 111 to be connected with the same fingerprint identification scanning line 181, so that the number of the fingerprint identification scanning lines 181 can be reduced, the coupling between the wires in the display panel is further reduced, the circuit noise is reduced, and the fingerprint identification accuracy is improved.
Optionally, each sensor unit group includes one column of sensor units 111; each sensor cell 111 of the dummy sensor cell group 110a is located between two adjacent rows of pixel cells 160, and each sensor cell 111 of the fingerprint identification sensor cell group 110b is located between two adjacent columns of pixel cells 160. Alternatively, each sensor cell 111 of the fingerprint recognition sensor cell group 110b is located between two adjacent rows of pixel cells 160, and each sensor cell 111 of the dummy sensor cell group 110a is located between two adjacent columns of pixel cells 160.
Illustratively, as shown in fig. 4, each sensor cell 111 of the dummy sensor cell group 110a is located between two adjacent rows of pixel cells 160, and each sensor cell 111 of the fingerprint identification sensor cell group 110b is located between two adjacent columns of pixel cells 160. In other embodiments, each sensor cell 111 of the fingerprint identification sensor cell group 110b may be located between two adjacent rows of pixel cells 160, and each sensor cell 111 of the dummy sensor cell group 110a may be located between two adjacent columns of pixel cells 160.
Optionally, each fingerprint identification sensor unit group 110b includes two adjacent columns of sensor units 111, and each dummy sensor unit group 110a includes one column of sensor units 111, as shown in fig. 7, in other embodiments, each dummy sensor unit group 110a and each fingerprint identification sensor unit group 110b may include two adjacent columns of sensor units 111, as shown in fig. 8.
Fig. 7 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 7, each fingerprint recognition sensor cell group 110b includes two adjacent columns of sensor cells 111; each dummy sensor cell group 110a includes one column of sensor cells 111; the sensor units 111 of each fingerprint sensor unit group 110b are connected to the same second signal collecting line 120b.
A column of sensor cells 111 in each fingerprint identification sensor cell group 110b is located between adjacent rows of pixel cells 160; another column of sensor cells 111 is located between adjacent columns of pixel cells 160.
Specifically, each fingerprint identification sensor unit group 110b includes two adjacent columns of sensor units 111, each dummy sensor unit group 110a includes one column of sensor units 111, and the number of the sensor units 111 used for fingerprint identification is increased under the condition that the total number of the sensor units 111 is the same, so that the resolution of a fingerprint image acquired by the fingerprint identification sensor unit group 110b is higher, the acquired fingerprint information is more, the fingerprint information is closer to actual fingerprint information, and the accuracy of fingerprint identification is improved.
Fig. 8 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 8, each dummy sensor cell group 110a and each fingerprint recognition sensor cell group 110b includes two adjacent columns of sensor cells 111.
A column of sensor cells 111 is located between adjacent rows of pixel cells 160.
Another column of sensor cells 111 is located between adjacent columns of pixel cells 160.
Specifically, the first column of dummy sensor cell group 110a includes a first column of sensor cells 111 and a second column of sensor cells 111, the first column of fingerprint identification sensor cell group 110b includes a third column of sensor cells 111 and a fourth column of sensor cells 111, the first column of sensor cells 111 is located between two adjacent rows of the first column of pixel cells 160, the second column of sensor cells 111 is located between the first column of pixel cells 160 and the second column of pixel cells 160, the third column of sensor cells 111 is located between two adjacent rows of the second column of pixel cells 160, and the fourth column of sensor cells 111 is located between the second column of pixel cells 160 and the third column of pixel cells 160. Compared with the above embodiment, the sensor units 111 are arranged between the adjacent rows and the adjacent columns of the pixel unit 160 array, so that the number of the sensor units 111 in the dummy sensor unit group 110a is increased, more first acquisition signals are acquired for more areas, the determined denoising acquisition signals are more accurate on the basis of more first acquisition signals, and the accuracy of fingerprint identification is improved.
Optionally, fig. 9 is a schematic partial cross-sectional structure diagram of another display panel according to an embodiment of the present invention. As shown in fig. 9, the display panel 100 further includes a driving circuit layer, and the signal collection line and the source/drain electrode layer in the driving circuit layer are disposed in the same layer.
Illustratively, as shown in fig. 9, the display panel 100 includes a pixel unit 160, a dummy sensor unit group 110a, and a fingerprint identification sensor unit group 110b, and each of the pixel unit 160 includes a driving circuit layer, the driving circuit layer of the pixel unit 160 includes a source electrode 211, a drain electrode 212, and a gate electrode 213, wherein the source electrode 211 is connected to a data signal line for outputting a data signal, and the gate electrode 213 is connected to a display scan signal line. The driving circuit layer of the dummy sensor cell group 110a includes a source electrode 211 and a gate electrode 213, and the first signal collecting line 120a is not connected to the drain electrode of the dummy sensor cell group 110a for outputting a second collecting signal; the driving circuit layer of the fingerprint identification sensor unit group 110b includes a source electrode 211, a drain electrode 212 and a gate electrode 213, and the drain electrode 212 is connected to the second signal collecting line 120b for outputting a second collecting signal. In the prior art, the drain electrode 212 and the source electrode 211 are disposed in the same layer and are fabricated at the same time. In the embodiment of the invention, the first signal collecting line 120a and the second signal collecting line 120b are arranged on the same layer as the source electrode 211 and the drain electrode 212, so that an additional manufacturing process is not required, and the process flow is simplified.
Optionally, with continued reference to fig. 9, the display panel 100 further includes a substrate base 150, and the sensor unit is located on the substrate base 150; a light shielding layer 190 is provided between the sensor unit and the base substrate 150; the perpendicular projection of the sensor unit on the base substrate 150 is located within the perpendicular projection of the light-shielding layer 190 on the base substrate 150.
For example, as shown in fig. 9, the sensor cells in the dummy sensor cell group 110a and the sensor cells in the fingerprint recognition sensor cell group 110b are disposed on the substrate 150, and a light shielding layer 190 is disposed between the sensor cells and the substrate 150. The light shielding layer 190 is used for shielding light entering from the substrate base plate 150 from irradiating the finger sensor unit, shielding stray light, reducing optical noise, and improving accuracy of fingerprint identification.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises any one of the display panels provided in the embodiments of the application.
Fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 10, the display device 200 includes any one of the display panels 100 and the backlight module 220 in the above embodiments, and the display panel 100 is located at a light emitting surface side of the backlight module 220, so that the backlight source provided by the backlight module 220 can be incident into the display panel 100 to provide backlight for the display panel 100.
The display device 200 provided in the embodiment of the present invention may also be an OLED display device, which has the beneficial effects of the display panel 100 in the above embodiments, and is not described herein again. In a specific implementation, the display device 200 may be a mobile phone, a tablet computer, a notebook computer, or any product or component with a display function, such as a television, a display area, a digital photo frame, a navigator, an intelligent wearable display device, and the like, which is not limited in this embodiment of the present invention.
Based on the same inventive concept, the embodiment of the invention also provides a fingerprint identification method which is suitable for any display panel provided in the embodiment of the application.
Fig. 11 is a flowchart illustrating a fingerprint identification method according to an embodiment of the present invention. As shown in fig. 11, the fingerprint identification method specifically includes:
310, a first collecting signal of the dummy sensor unit group and a second collecting signal of the fingerprint identification sensor unit group are obtained.
Each sensor unit in the nominal sensor unit group is not connected with the first signal acquisition line, the first acquisition signal is acquired on the first signal acquisition line and is a circuit noise signal generated by wiring coupling, each sensor unit in the fingerprint identification sensor unit group is connected with the second signal acquisition line, and the second acquisition signal is acquired on the second signal acquisition line and is a superposition signal of the circuit noise signal and the effective fingerprint signal generated by wiring coupling.
And 320, determining a de-noising acquisition signal of the fingerprint identification sensor unit group according to the first acquisition signal and the second acquisition signal.
The first acquisition signal is only a circuit noise signal, and the second acquisition signal is a superposed signal of the circuit noise signal generated by wiring coupling and an effective fingerprint signal. Therefore, the circuit noise signal in the second collected signal can be removed with reference to the first collected signal to obtain an effective fingerprint signal, i.e., a de-noised collected signal.
Fig. 12 is a flowchart illustrating another fingerprint identification method according to an embodiment of the present invention. As shown in fig. 12, the fingerprint identification method specifically includes:
and 311, taking the median or the average of the first collected signals collected by the dummy sensor unit group as a noise signal.
312, taking the difference between the second collecting signal collected by the fingerprint identification sensor unit group and the noise signal as the de-noising collecting signal of the fingerprint identification sensor unit group.
And 320, determining the de-noising acquisition signal of the fingerprint identification sensor unit group according to the first acquisition signal and the second acquisition signal.
Specifically, gather the first acquisition signal on the first signal acquisition line that corresponds the electricity and connect with each nominal sensor unit group, gathered a plurality of first acquisition signals promptly, through the median or the average value with a plurality of first acquisition signals as circuit noise signal, can acquire more accurate circuit noise to improve fingerprint identification's accuracy.
When the distances between any two adjacent columns of the dummy sensor unit groups are equal; the specific steps of the fingerprint identification method when the dummy sensor unit groups and the fingerprint identification sensor unit groups are circularly arranged at intervals are as shown in fig. 13. Fig. 13 is a flowchart illustrating another fingerprint identification method according to an embodiment of the present invention. As shown in fig. 13, the fingerprint identification method specifically includes:
313, taking an average value of the first collecting signals collected by the dummy sensor unit groups adjacent to the left and right sides of the fingerprint identification sensor unit group as a noise signal.
312, taking a difference value between the second collecting signal collected by the fingerprint sensor unit group and the noise signal as a de-noising collecting signal of the fingerprint sensor unit group.
And 320, determining a de-noising acquisition signal of the fingerprint identification sensor unit group according to the first acquisition signal and the second acquisition signal.
Specifically, the distance between any two adjacent columns of the dummy sensor unit groups 110a is equal, the acquired noise signals are uniformly distributed in the whole display area, the noise signals of all areas are collected, the noise signal calculation error of the display panel caused by the overlarge noise signal difference of different areas is avoided, the circuit noise signals sensed by the fingerprint identification sensor unit groups are close to the circuit noise signals sensed by the sensor unit groups on the left side or the right side of the fingerprint identification sensor unit groups, the determined de-noising acquisition signals are more accurate, and therefore the sensitivity of fingerprint identification is improved.
The foregoing is considered as illustrative of the preferred embodiments of the invention and technical principles employed. The present invention is not limited to the specific embodiments herein, and it will be apparent to those skilled in the art that various changes, rearrangements, and substitutions can be made without departing from the scope of the invention. Therefore, although the present invention has been described in more 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 claims.
Claims (16)
1. A display panel, comprising: the system comprises a plurality of sensor units arranged in an array and a plurality of signal acquisition lines; the signal acquisition line is parallel to the column direction of the array; the sensor units form a multi-column sensor unit group; the sensor units in the same column are positioned in the same sensor unit group; the multiple rows of sensor unit groups correspond to the multiple signal acquisition lines one by one;
the sensor unit groups in multiple columns comprise at least one column of dummy sensor unit groups; the sensor unit groups in other columns are fingerprint identification sensor unit groups; the signal acquisition lines which correspond to the dummy sensor unit groups one by one are first signal acquisition lines; the signal acquisition lines which correspond to the fingerprint identification sensor unit groups one by one are second signal acquisition lines; the output ends of the sensor units of the dummy sensor unit group are disconnected with the first signal acquisition lines corresponding to one; the output end of the fingerprint identification sensor unit group is electrically connected with the second signal acquisition lines in one-to-one correspondence.
2. The display panel according to claim 1, wherein the display area of the display panel includes a middle area, and edge areas located on both sides of the middle area in a row direction of the array; the edge area and the middle area are provided with at least one column of the dummy sensor unit group.
3. The display panel according to claim 1, wherein the distance between any two adjacent columns of the groups of dummy sensor cells is equal.
4. The display panel according to claim 3, wherein the dummy sensor cell groups are arranged at intervals of a cycle with the fingerprint identification sensor cell groups.
5. The display panel according to claim 1, further comprising a substrate base and a plurality of pixel units arranged in an array on the substrate base; a black matrix is arranged in an area between the adjacent pixel units, and the film layer where the black matrix is located on one side, away from the substrate, of the sensor unit; the sensor unit is positioned between two adjacent columns of the pixel units; and/or the sensor unit is positioned between two adjacent rows of the pixel units; the black matrix is provided with an opening, and the vertical projection of the opening on the substrate base plate is at least partially overlapped with the sensor unit.
6. The display panel according to claim 5, wherein the sensor unit is located between two adjacent columns of the pixel units and between two adjacent rows of the pixel units;
the display panel also comprises a plurality of fingerprint identification scanning lines; the fingerprint identification scanning line is parallel to the row direction of the array;
the sensor units between the pixel units in the ith row and the pixel units in the (i + 1) th row and the sensor units between the adjacent pixel units in the ith row are connected with the same fingerprint identification scanning line;
or the sensor units between the pixel units in the ith row and the pixel units in the (i + 1) th row and the sensor units between the adjacent pixel units in the (i + 1) th row are connected with the same fingerprint identification scanning line;
i is a positive integer of 1 or more.
7. The display panel according to claim 6, wherein each of the sensor cell groups includes one column of the sensor cells;
each sensor unit of the dummy sensor unit group is positioned between two adjacent rows of the pixel units, and each sensor unit of the fingerprint identification sensor unit group is positioned between two adjacent columns of the pixel units; or, each sensor unit of the fingerprint identification sensor unit group is located between two adjacent rows of the pixel units, and each sensor unit of the dummy sensor unit group is located between two adjacent columns of the pixel units.
8. The display panel according to claim 6, wherein each of the groups of fingerprint recognition sensor cells comprises two adjacent columns of the sensor cells; each dummy sensor cell group comprises a column of the sensor cells; each sensor unit in each fingerprint identification sensor unit group is connected with the same second signal acquisition line;
one column of the sensor units in each of the fingerprint identification sensor unit groups is positioned between the adjacent rows of the pixel units; another column of the sensor cells is located between adjacent columns of the pixel cells.
9. The display panel according to claim 6, wherein each of the dummy sensor cell groups and each of the fingerprint recognition sensor cell groups comprises two adjacent columns of the sensor cells;
a column of the sensor units is positioned between the adjacent rows of the pixel units;
another column of the sensor cells is located between adjacent columns of the pixel cells.
10. The display panel according to claim 5, wherein the sensor unit is located between two adjacent columns of the pixel units or between two adjacent rows of the pixel units;
each of the dummy sensor cell groups and each of the fingerprint recognition sensor cell groups includes a column of the sensor cells.
11. The display panel according to claim 1, further comprising a driver circuit layer; the signal acquisition line and the source/drain electrode layer in the driving circuit layer are arranged on the same layer.
12. The display panel according to claim 1, further comprising a substrate base plate; the sensor unit is positioned on the substrate base plate; a light shielding layer is arranged between the sensor unit and the substrate; the vertical projection of the sensor unit on the substrate base plate is positioned in the vertical projection of the light shielding layer on the substrate base plate.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
14. A fingerprint recognition method applied to the display device of claim 13, the method comprising:
acquiring a first acquisition signal of the dummy sensor unit group and a second acquisition signal of the fingerprint identification sensor unit group;
and determining the de-noising acquisition signal of the fingerprint identification sensor unit group according to the first acquisition signal and the second acquisition signal.
15. The method of claim 14, wherein determining de-noised acquisition signals for the set of fingerprint sensor cells from the first acquisition signal and the second acquisition signal comprises:
taking the median or average value of the first acquisition signals acquired by the dummy sensor unit group as a noise signal;
and taking the difference value between the second acquisition signal acquired by the fingerprint identification sensor unit group and the noise signal as a de-noising acquisition signal of the fingerprint identification sensor unit group.
16. The method of claim 14, wherein the distance between any two adjacent columns of the groups of dummy sensor cells is equal; the dummy sensor unit group and the fingerprint identification sensor unit group are circularly arranged at intervals;
the determining the de-noising collected signal of the fingerprint identification sensor unit group according to the first collected signal and the second collected signal comprises:
taking the average value of the first acquisition signals acquired by the dummy sensor unit groups adjacent to the left and right sides of the fingerprint identification sensor unit group as a noise signal;
and taking the difference value of the second acquisition signal acquired by the fingerprint identification sensor unit group and the noise signal as a de-noising acquisition signal of the fingerprint identification sensor unit group.
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| US20160147357A1 (en) * | 2014-11-21 | 2016-05-26 | Chengliang Ye | Anti-noise method of touch panel, touch panel and display device |
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