CN111144268B - Fingerprint identification method of display panel, display panel and display device - Google Patents
Fingerprint identification method of display panel, display panel and display device Download PDFInfo
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- CN111144268B CN111144268B CN201911338535.9A CN201911338535A CN111144268B CN 111144268 B CN111144268 B CN 111144268B CN 201911338535 A CN201911338535 A CN 201911338535A CN 111144268 B CN111144268 B CN 111144268B
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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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- 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
- G06V40/1365—Matching; Classification
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Abstract
The embodiment of the invention discloses a fingerprint identification method of a display panel, the display panel and a display device. The fingerprint identification method comprises the following steps: controlling all sub-pixels in the fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal by the ith row and jth column fingerprint identification units; in the fingerprint identification unit group, sub-pixels adjacent to the jth row and jth column fingerprint identification units in the ith row do not emit light, other sub-pixels emit light, and the jth row and jth column fingerprint identification units in the ith row acquire second fingerprint identification signals; acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal as a fingerprint identification signal; circularly executing the fingerprint identification operation until fingerprint identification signals of all fingerprint identification units are acquired; wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers. The technical scheme of the embodiment of the invention is used for improving the fingerprint identification precision of the display panel with the fingerprint identification function.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a fingerprint identification method for a display panel, a display panel and a display device.
Background
Fingerprints are inherent and unique biological features, and electronic devices with fingerprint identification functions are increasing. Taking a mobile phone as an example, fingerprint identification can be applied to various scenes such as unlocking, payment and the like.
With the development of display technologies, high screen ratio, narrow bezel display panels are becoming more popular due to good user experience. In order to improve the screen occupation ratio and have a fingerprint identification function, an optical fingerprint identification scheme embedded in the screen is receiving more and more attention. Because the fingerprint identification unit sets up inside the screen, the light that the light source sent will see through a plurality of rete transmissions of display panel, then just can reach the fingerprint identification unit through a plurality of retes after touch main part reflection again, and the intensity of light is received weakly in the fingerprint identification unit, receives other light interference easily, and the discernment precision remains to be improved.
Disclosure of Invention
The embodiment of the invention provides a fingerprint identification method of a display panel, the display panel and a display device, which are used for improving the fingerprint identification precision of the display panel with an on-screen fingerprint identification function.
In a first aspect, an embodiment of the present invention provides a fingerprint identification method for a display panel, where the display panel includes a plurality of pixel units arranged in an array and a plurality of fingerprint identification units arranged in an array, each of the pixel units includes a plurality of sub-pixels, and a plurality of the sub-pixels are surrounded around each of the fingerprint identification units; the fingerprint identification units arranged in an array comprise a plurality of fingerprint identification unit groups, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units;
the fingerprint identification method comprises the following steps:
controlling all sub-pixels in the fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal by an ith row and a jth column fingerprint identification unit;
in the fingerprint identification unit group, sub-pixels adjacent to the fingerprint identification unit in the ith row and the jth column do not emit light, other sub-pixels emit light, and the fingerprint identification unit in the ith row and the jth column collects a second fingerprint identification signal;
acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of an ith row and a jth column fingerprint identification unit;
circularly executing the fingerprint identification operation until fingerprint identification signals of all fingerprint identification units are acquired;
wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers.
In a second aspect, an embodiment of the present invention further provides a display panel, which is suitable for the above fingerprint identification method of the display panel, where the display panel includes a plurality of pixel units arranged in an array and a plurality of fingerprint identification units arranged in an array, each pixel unit includes a plurality of sub-pixels, and a plurality of sub-pixels are surrounded around each fingerprint identification unit; the fingerprint identification units arranged in an array comprise a plurality of fingerprint identification unit groups, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units; further comprising:
a control unit to:
controlling all sub-pixels in the fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal by the ith row and jth column fingerprint identification units;
in the fingerprint identification unit group, sub-pixels adjacent to the fingerprint identification unit in the ith row and the jth column do not emit light, other sub-pixels emit light, and the fingerprint identification unit in the ith row and the jth column collects a second fingerprint identification signal;
acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of an ith row and a jth column fingerprint identification unit;
circularly executing the fingerprint identification operation until the fingerprint identification signals of all the fingerprint identification units are acquired;
wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers.
In a third aspect, an embodiment of the present invention further provides a display device, including any one of the display panels described above.
The embodiment of the invention provides a fingerprint identification method of a display panel, wherein the display panel comprises a plurality of pixel units arranged in an array and a plurality of fingerprint identification units arranged in an array, each pixel unit comprises a plurality of sub-pixels, and the periphery of each fingerprint identification unit surrounds the plurality of sub-pixels; the fingerprint identification units arranged in an array comprise a plurality of fingerprint identification unit groups, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units; the fingerprint identification method comprises the following steps: firstly, controlling all sub-pixels in a fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal through an ith row and jth column fingerprint identification unit; in the fingerprint identification unit group, sub-pixels adjacent to the jth row and jth column fingerprint identification units in the ith row do not emit light, other sub-pixels emit light, and secondary fingerprint identification signals are collected through the jth row and jth column fingerprint identification units in the ith row; then obtaining a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of an ith row and a jth column fingerprint identification unit; circularly executing the fingerprint identification operation until the fingerprint identification signals of all the fingerprint identification units are acquired; wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers. By acquiring a difference signal of a first-time fingerprint identification signal and a second-time fingerprint identification signal, wherein the first-time fingerprint identification signal comprises a fingerprint identification signal (a signal returned by light rays emitted by sub-pixels adjacent to the fingerprint identification unit to be detected) and a crosstalk signal (a signal returned by light rays emitted by sub-pixels in the fingerprint identification unit group not adjacent to the fingerprint identification unit to be detected), the second-time fingerprint identification signal comprises the crosstalk signal, and the crosstalk signal is filtered from the difference signal, so that the fingerprint identification precision is effectively improved.
Drawings
FIG. 1 is a schematic diagram of a light path for fingerprint recognition of a display panel;
fig. 2 is a schematic flowchart illustrating a fingerprint identification method for a display panel according to an embodiment of the present invention;
fig. 3 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a 3T1D fingerprint identification unit according to an embodiment of the present invention;
FIG. 5 is a timing diagram illustrating the operation of the 3T1D fingerprint identification unit shown in FIG. 4;
fig. 6 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating another method for fingerprint recognition of a display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the disclosure;
fig. 10 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail 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 of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 shows a schematic diagram of a light path for fingerprint identification of a display panel, where the display panel includes a fingerprint identification unit 1 and a sub-pixel 2, and a light ray c emitted by the sub-pixel 2a adjacent to the fingerprint identification unit 1 is transmitted through a film layer above the sub-pixel 2a and then emitted, and then reflected by a fingerprint valley or a fingerprint ridge, and received by the fingerprint identification unit 1, and since the reflectivity of the fingerprint valley and the fingerprint ridge at different positions is different, the signals received by the fingerprint identification unit 1 at different positions are different, so as to realize fingerprint identification. In the actual fingerprint identification process, the light d emitted by the sub-pixel 2b far away from the fingerprint identification unit 1 is also received by the fingerprint identification unit 1 after being reflected by the fingerprint, so that signal crosstalk is caused, and the fingerprint identification precision is reduced.
In order to solve the above problem, an embodiment of the present invention provides a fingerprint identification method for a display panel, where the display panel includes a plurality of pixel units arranged in an array and a plurality of fingerprint identification units arranged in an array, each pixel unit includes a plurality of sub-pixels, and a plurality of sub-pixels are surrounded around each fingerprint identification unit; the fingerprint identification units arranged in an array comprise a plurality of fingerprint identification unit groups, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units; fig. 2 is a schematic flow chart of a fingerprint identification method for a display panel according to an embodiment of the present invention, and referring to fig. 2, the fingerprint identification method includes:
and S110, controlling all sub-pixels in the fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal by the ith row and jth column fingerprint identification units.
And step S120, controlling sub-pixels adjacent to the jth row and jth column fingerprint identification units in the fingerprint identification unit group not to emit light, other sub-pixels to emit light, and collecting second fingerprint identification signals by the jth row and jth column fingerprint identification units in the ith row.
And step S130, acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of the ith row and jth column fingerprint identification unit.
Step S140, the above fingerprint identification operation is executed in a loop until the fingerprint identification signals of all the fingerprint identification units are acquired.
Wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers.
For example, taking m-n-3 as an example, fig. 3 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention, and referring to fig. 3, the display panel includes a plurality of pixel units 10 arranged in an array and a plurality of fingerprint identification units 20 arranged in an array, each pixel unit 10 includes a plurality of sub-pixels 11, each sub-pixel 11 includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and each fingerprint identification unit 20 surrounds the plurality of sub-pixels 11; the plurality of fingerprint identification units 20 arranged in an array comprises a plurality of fingerprint identification unit groups 30, and each fingerprint identification unit group 30 comprises 3 rows and 3 columns of fingerprint identification units 20.
The following describes the principle of acquiring a fingerprint identification signal of one fingerprint identification unit (e.g. the fifth fingerprint identification unit, corresponding to i ═ j ═ 2) in a fingerprint identification unit group according to an embodiment of the present invention, with reference to fig. 3. Firstly, all the sub-pixels in the fingerprint identification unit group 30 are controlled to emit light, the fifth fingerprint identification unit 201 collects first fingerprint identification signals S1, and S1 includes effective signals returned by light emitted by eight sub-pixels adjacent to the fifth fingerprint identification unit 201 and crosstalk signals returned by light emitted by other sub-pixels not adjacent to the fifth fingerprint identification unit 201; then, the eight sub-pixels adjacent to the fifth fingerprint identification unit 201 are turned off, the brightness of the other sub-pixels is kept unchanged, the fifth fingerprint identification unit 201 collects the second fingerprint identification signal S2, S2 includes crosstalk signals, S is calculated as S2-S1, and S is taken as the fingerprint identification signal of the fifth fingerprint identification unit. Similarly, every two times of signal acquisition, the fingerprint identification signals for weakening the crosstalk signals are obtained, all the obtained fingerprint identification signals are processed, and the fingerprint identification precision can be effectively improved.
It can be understood that the fingerprint identification unit is used for converting the optical signal into the electrical signal to be output, the reflectivity of the light of the fingerprint valley and the fingerprint ridge is different, and the fingerprint identification units corresponding to different positions can output different signals. The fingerprint recognition unit generally includes a plurality of transistors and a photodiode, for example, a fingerprint recognition unit formed of three transistors and a photodiode (3T1D), and a fingerprint recognition unit formed of four transistors and a photodiode (4T 1D). For example, fig. 4 is a schematic circuit diagram of a 3T1D fingerprint identification unit according to an embodiment of the present invention. Referring to fig. 4, the fingerprint recognition unit includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a capacitor C, and a photodiode D. A control terminal of the first thin film transistor T1 is electrically connected to a Reset control scan line Reset, a first terminal of the first thin film transistor T1 is electrically connected to a voltage signal line VDD, a second terminal of the first thin film transistor T1 is electrically connected to a cathode of the photodiode D, an anode of the photodiode D is electrically connected to a common voltage signal line Vbias, and a capacitor C is connected in parallel to the photodiode D. A control terminal of the second thin film transistor T2 is electrically connected to the second terminal of the first thin film transistor T1, a first terminal of the second thin film transistor T2 is electrically connected to the voltage signal line VDD, a second terminal of the second thin film transistor T2 is electrically connected to the first terminal of the third thin film transistor T3, a control terminal of the third thin film transistor T3 is electrically connected to the output control scan line Select, and a second terminal of the third thin film transistor T3 is electrically connected to the output signal line Vout. Correspondingly, the fingerprint identification process corresponding to the fingerprint identification unit sequentially comprises a reset stage, a first reading stage and a second reading stage; the first read phase and the second read phase are separated by an integration phase.
Illustratively, fig. 5 is a timing diagram illustrating the operation of the 3T1D fingerprint identification unit shown in fig. 4. Referring to fig. 5, the operation of the fingerprint recognition unit is: in the Reset phase T1, the high level provided by the Reset control scan line Reset controls the first thin film transistor T1 to be turned on, and the voltage on the voltage signal line VDD is transmitted to the Q node through the first thin film transistor T1, so that the potential of the Q node is Reset; in the first reading phase T2, the integration phase T and the second reading phase T3, the first thin film transistor T1 is turned off, the photodiode D generates a leakage current due to illumination, the capacitor C discharges, the potential of the Q node gradually decreases, the second thin film transistor T2 operates in a linear region, the magnitude of the leakage current is proportional to the potential of the Q node, in the first reading phase T2, the third thin film transistor T3 is controlled to be turned on, the voltage provided by the voltage signal line VDD flows to the output signal line Vout through the second thin film transistor T2 and the third thin film transistor T3, the turning-on degree of the second thin film transistor T2 determines the potential on the output signal line Vout, the turning-on degree of the second thin film transistor T2 is determined by the voltage of the Q node, that is the potential of the Q node determines the potential on the output signal line Vout, the voltage value read by the first reading phase T2 on the output signal line Vout is V1, the voltage value on the output signal line Vout read in the second reading phase t3 is V2, then V1-V2 are determined by the magnitude of the leakage current of the photodiode D, and the magnitude of the leakage current of the photodiode D is determined by the intensity of the light received by the photodiode D, so that V2 under different light intensities is different, and during fingerprint detection, the light intensities reflected to the photodiode D are different in different fingerprint areas, so that a signal is obtained by detecting the VI-V2 corresponding to the light sensing unit at each position in the fingerprint identification area.
In this embodiment, the fingerprint identification signal of each fingerprint identification unit is acquired twice through the above process, and then the difference between the two acquired signals is used as the fingerprint identification signal, so that the crosstalk signal is effectively weakened, and the identification accuracy is improved.
According to the technical scheme of the embodiment of the invention, the difference signal of the first fingerprint identification signal and the second fingerprint identification signal is obtained, wherein the first fingerprint identification signal comprises a fingerprint identification signal (a signal returned by light rays emitted by sub-pixels adjacent to the fingerprint identification unit to be detected) and a crosstalk signal (a signal returned by light rays emitted by sub-pixels in the fingerprint identification unit group not adjacent to the fingerprint identification unit to be detected), the second fingerprint identification signal comprises the crosstalk signal, and the crosstalk signal is filtered from the difference signal, so that the fingerprint identification precision is effectively improved.
On the basis of the above embodiment, optionally, the fingerprint identification operations of a plurality of fingerprint identification unit groups are performed simultaneously.
It can be understood that, when carrying out fingerprint identification, the finger can cover a plurality of fingerprint identification unit groups, in order to improve fingerprint identification speed, the fingerprint identification operation of the fingerprint identification group (for example two non-adjacent fingerprint identification groups of at least one fingerprint identification group in interval, can not mutual interference when each regional interior sub-pixel is luminous) far away apart from the phase distance during the discernment, can design according to actual conditions during the concrete implementation) can go on simultaneously, in order to improve fingerprint identification speed, promote user experience.
Optionally, the display panel further includes a plurality of touch units arranged in an array, and each touch unit covers a plurality of fingerprint identification unit groups; before controlling all sub-pixels in the fingerprint identification unit group to emit light and collecting a first fingerprint identification signal by the ith row and the jth column fingerprint identification units, the method further comprises the following steps:
the coverage area of the touch body is detected through the touch unit.
For example, fig. 6 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention, and referring to fig. 6, the display panel includes a plurality of touch units 40 arranged in an array, each touch unit 40 is electrically connected to at least one touch electrode line (not shown in fig. 6), each touch unit 40 covers a plurality of fingerprint identification unit groups 30, where fig. 6 exemplarily shows that each touch unit 40 covers 25 (5 rows and 5 columns) fingerprint identification unit groups 30, and each fingerprint identification unit group 30 may be the structure shown in fig. 3, as shown in a partially enlarged schematic diagram on the left side of fig. 6. In the embodiment of the invention, the fingerprint identification unit is arranged in the screen, so that the fingerprint identification efficiency can be improved by firstly detecting the coverage area of the touch main body (such as a finger) through the touch control unit 40 and then only driving the fingerprint identification unit in the finger coverage area to work, so that the condition that all fingerprint identification units scan fingerprint signals during fingerprint identification can be avoided, the fingerprint identification efficiency can be improved, and the power consumption can be reduced.
Optionally, fig. 7 is a schematic flow chart of another fingerprint identification method for a display panel according to an embodiment of the present invention, and referring to fig. 7, the fingerprint identification method further includes:
s1, controlling all sub-pixels in the coverage area of one touch unit to emit light, and collecting first fingerprint identification signals by all fingerprint identification units in the coverage area of the touch unit.
It can be understood that, since all the sub-pixels emit light in this step, the first fingerprint identification signal collected by each fingerprint identification unit includes an effective signal and a crosstalk signal, i.e. the first fingerprint identification signal collection process is equivalent to the first fingerprint identification signal collection process of the plurality of fingerprint identification units performing step S110 in the above embodiment at a time.
S2, in at least one group of fingerprint identification unit groups in the coverage area of the touch control unit, sub-pixels adjacent to the ith row and jth column fingerprint identification units do not emit light, other sub-pixels emit light, and the ith row and jth column fingerprint identification units in the at least one group of fingerprint identification unit groups acquire second fingerprint identification signals.
S3, acquiring a first difference signal of the first fingerprint identification signal and the second fingerprint identification signal acquired by the ith row and jth column fingerprint identification unit, wherein the first difference signal is used as the fingerprint identification signal of the ith row and jth column fingerprint identification unit.
S4, the above fingerprint identification operations S2 and S3 are executed in a loop until the fingerprint identification signals of all fingerprint identification units in the coverage area of one touch control unit are obtained.
For example, taking the touch unit shown in fig. 6 as an example, in step S2, the adjacent sub-pixels of the fifth fingerprint identification unit (the fingerprint identification unit of the 2 nd row and the 2 nd column in the fingerprint identification unit group 30) in the 1 st, 3 th and 5 th rows, the 1 st, 3 th and 5 th columns and the 2 nd and 4 th rows and the 2 nd and 4 th columns may be controlled to be turned off, and then the fifth fingerprint identification unit in the fingerprint identification unit group is controlled to collect the second fingerprint identification signal; in step S3, the first fingerprint identification signal and the second fingerprint identification signal corresponding to each fingerprint identification unit are subtracted to form a first difference signal, so as to obtain the fingerprint identification signals acquired by the 13 fingerprint identification units. When step S2 is executed again, the rows 1, 3 and 5, the columns 2 and 4 and the rows 2 and 4 may be controlled to be turned off first, and the adjacent sub-pixel of the fifth fingerprint identification unit in the fingerprint identification unit group 30 of the columns 1, 3 and 5 is controlled to be turned off to obtain the second fingerprint identification signal, and then in step S3, the first fingerprint identification signal and the second fingerprint identification signal corresponding to each fingerprint identification unit are subtracted to obtain the fingerprint identification signals obtained by the other 12 fingerprint identification units (the fifth fingerprint identification unit in each fingerprint identification unit group) in the same touch unit. Similarly, the steps S2 and S3 are executed repeatedly, so as to obtain the fingerprint identification signals of all fingerprint identification units in the coverage area of one touch control unit.
Optionally, the fingerprint identification method provided in the embodiment of the present invention further includes: and executing the steps S1-S4 one by one for each touch unit of the touch main body coverage area until fingerprint identification signals of all fingerprint identification units of the touch main body coverage area are acquired.
It can be understood that, in the implementation, under the condition that the light rays emitted by the sub-pixels do not interfere with each other, the fingerprint identification operation of the fingerprint identification unit covered by the multiple finger touch areas can be simultaneously executed, so as to improve the fingerprint identification speed.
It should be noted that the process of obtaining the fingerprint identification signal by dividing the fingerprint identification unit group and lighting or turning off the sub-pixels in the sub-regions is only illustrative, and in other embodiments, the number of the turned-off sub-pixels during the second fingerprint identification signal acquisition may be adjusted according to actual conditions to acquire more accurate crosstalk data, and may be selected according to actual conditions during specific implementation.
Optionally, in the fingerprint identification process, the brightness of the sub-pixels emitting light in the fingerprint identification unit group is controlled to be 255 gray scales.
It can be understood that the luminance of the sub-pixels varies between the brightest and darkest, and is divided into several parts, and the gray levels represent the gradation levels with different luminance from the darkest to the brightest. The more intermediate levels, the finer the picture effect that can be presented. In the present embodiment, the luminance of the sub-pixel can represent the 8 th power of 2, which is equal to 256 luminance levels, i.e. 256 gray levels (0 gray level to 255 gray levels). The brightness of the sub-pixels which emit light in the fingerprint identification unit group is set to be 255 gray scales, namely the brightest brightness, so that the correspondingly arranged fingerprint identification units receive more light rays, the signal intensity of the fingerprint identification units is correspondingly increased, detection and identification are facilitated, and the accuracy of fingerprint identification is improved.
An embodiment of the present invention further provides a display panel, which is suitable for any one of the above fingerprint identification methods of the display panel, for example, fig. 8 is a schematic structural diagram of the display panel according to the embodiment of the present invention, and referring to fig. 8, the display panel includes a plurality of pixel units 10 arranged in an array and a plurality of fingerprint identification units 20 arranged in an array, each pixel unit 10 includes a plurality of sub-pixels 11, and a periphery of each fingerprint identification unit 20 surrounds the plurality of sub-pixels 11; the fingerprint identification units 20 arranged in the array comprise a plurality of fingerprint identification unit groups 30, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units 20; further comprising: a control unit 50, the control unit 50 being configured to: controlling all sub-pixels 11 in the fingerprint identification unit group 30 to emit light, and collecting a first fingerprint identification signal by the ith row and jth column fingerprint identification unit 20; in the fingerprint identification unit group 30, the sub-pixel 11 adjacent to the ith row and jth column fingerprint identification unit 20 does not emit light, other sub-pixels 11 emit light, and the ith row and jth column fingerprint identification unit collects a second fingerprint identification signal; acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of the ith row and jth column fingerprint identification unit 20; circularly executing the fingerprint identification operation until the fingerprint identification signals of all the fingerprint identification units 20 are acquired; wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers.
It should be understood that, in the embodiment shown in fig. 8, m-n-3 is taken as an example, which is not intended to limit the embodiment of the present invention. Optionally, the display panel provided in the embodiment of the present invention may be a liquid crystal display panel or an organic light emitting display panel. When the display panel is a liquid crystal display panel, the sub-pixels are controlled to emit light or not by changing the electric field applied by the sub-pixels, and when the display panel is an organic light emitting display panel, the sub-pixels are controlled to emit light or not by controlling the on and off of the organic light emitting display device.
According to the display panel with embedded fingerprint identification provided by the embodiment of the invention, the difference signal of the first fingerprint identification signal and the second fingerprint identification signal is obtained, wherein the first fingerprint identification signal comprises a fingerprint identification signal (a signal returned by light rays emitted by sub-pixels adjacent to the fingerprint identification unit to be detected) and a crosstalk signal (a signal returned by light rays emitted by sub-pixels in a fingerprint identification unit group not adjacent to the fingerprint identification unit to be detected), the second fingerprint identification signal comprises the crosstalk signal, and the crosstalk signal is filtered from the difference signal, so that the fingerprint identification precision is effectively improved.
Fig. 9 is a schematic structural view of another display panel according to an embodiment of the present invention, and referring to fig. 9, optionally, the display panel according to the embodiment further includes a plurality of touch units 40 arranged in an array, where each touch unit 40 covers a plurality of fingerprint identification unit groups 30; the control unit 50 is also used to detect a coverage area of the touch subject through the touch unit 40.
It is understood that fig. 9 exemplarily shows that each touch unit 40 covers 25 fingerprint identification unit groups 30, in other embodiments, the touch units 40 may be set to other sizes, and the implementation may be determined according to actual situations. Fig. 9 also schematically shows the structure of the fingerprint identification unit groups 30, i.e. the structure shown in fig. 8 can be used, each fingerprint identification unit group 30 comprising 9 fingerprint identification units 20.
Optionally, the display panel includes a display area, at least a portion of the display area is a fingerprint identification area, and the fingerprint identification unit is located in the fingerprint identification area; in the fingerprint identification area, the pixel units are arranged in one-to-one correspondence with the fingerprint identification units.
Illustratively, with continued reference to fig. 8, the display panel includes display areas 110, the display areas 110 are each provided with a fingerprint identification unit 20, and the pixel units 10 are arranged in one-to-one correspondence with the fingerprint identification units 20. In other embodiments, the size of the fingerprint identification area may be designed according to actual requirements, for example, the 1/2 display area, the 1/4 display area, or an area that is easily touched by a finger only in the center below the display area, and the location and the size of the fingerprint identification area are not limited by the embodiments of the present invention.
Optionally, at least two fingerprint identification units are adjacently arranged in the fingerprint identification area.
Fig. 10 is a partial schematic structural diagram of another display panel according to an embodiment of the invention. Referring to fig. 10, every four fingerprint recognition units 20 are adjacently disposed.
It is understood that fig. 10 schematically shows the arrangement of the sub-pixels 11 of one fingerprint identification unit group, i.e. the fingerprint identification units 20, in this embodiment, every 4 fingerprint identification units 20 are adjacently arranged to form one sub-fingerprint identification unit group 210, and 9 sub-fingerprint identification unit groups 210 form one fingerprint identification unit group. In other embodiments, other arrangements of the fingerprint identification unit 20 and the pixel unit 10 may be provided, which is not limited in the embodiments of the present invention.
Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 11, the display device 100 includes any one of the display panels 200 according to the embodiments of the present invention. The display device 100 may be a mobile phone, a tablet computer, a smart wearable device, and the like.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. 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 modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A fingerprint identification method of a display panel is characterized in that the display panel comprises a plurality of pixel units arranged in an array and a plurality of fingerprint identification units arranged in an array, each pixel unit comprises a plurality of sub-pixels, and the periphery of each fingerprint identification unit surrounds the plurality of sub-pixels; the fingerprint identification units arranged in an array comprise a plurality of fingerprint identification unit groups, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units;
the fingerprint identification method comprises the following steps:
controlling all sub-pixels in the fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal by the ith row and jth column fingerprint identification units;
in the fingerprint identification unit group, sub-pixels adjacent to the fingerprint identification unit in the ith row and the jth column do not emit light, other sub-pixels emit light, and the fingerprint identification unit in the ith row and the jth column collects a second fingerprint identification signal;
acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of an ith row and a jth column fingerprint identification unit;
circularly executing the fingerprint identification operation until the fingerprint identification signals of all the fingerprint identification units are acquired;
wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers.
2. The method of claim 1, wherein the fingerprint recognition operations of the fingerprint recognition unit groups are performed simultaneously.
3. The method for fingerprint identification of a display panel according to claim 2, wherein the display panel further comprises a plurality of touch units arranged in an array, each touch unit covering a plurality of fingerprint identification unit groups;
before controlling all sub-pixels in the fingerprint identification unit group to emit light and the ith row and the jth column fingerprint identification units to collect fingerprint identification signals for the first time, the method further comprises the following steps:
and detecting a coverage area of the touch main body through the touch unit.
4. The fingerprint identification method of the display panel according to claim 3, further comprising:
s1, controlling all sub-pixels in the coverage area of one touch unit to emit light, and acquiring first fingerprint identification signals by all fingerprint identification units in the coverage area of the touch unit;
s2, controlling sub-pixels adjacent to the ith row and jth column of the fingerprint identification units in at least one group of fingerprint identification unit groups in the coverage area of the touch control unit not to emit light, other sub-pixels to emit light, and collecting second fingerprint identification signals by the ith row and jth column of the fingerprint identification units in at least one group of fingerprint identification unit groups;
s3, acquiring a first difference signal of the first fingerprint identification signal and the second fingerprint identification signal acquired by the fingerprint identification unit in the ith row and the jth column, wherein the first difference signal is used as the fingerprint identification signal of the fingerprint identification unit in the ith row and the jth column;
s4, the above fingerprint identification operations S2 and S3 are executed in a loop until the fingerprint identification signals of all fingerprint identification units in the coverage area of one touch control unit are obtained.
5. The fingerprint identification method of the display panel according to claim 4, further comprising: and executing the steps S1-S4 one by one for each touch unit of the touch main body coverage area until fingerprint identification signals of all fingerprint identification units of the touch main body coverage area are acquired.
6. The method of claim 1, wherein the brightness of the sub-pixels emitting light in the fingerprint identification unit group is controlled to be 255 grayscales during the fingerprint identification process.
7. A display panel, which is characterized by being applied to the fingerprint identification method of the display panel of any one of claims 1 to 6, wherein the display panel comprises a plurality of pixel units arranged in an array and a plurality of fingerprint identification units arranged in an array, each pixel unit comprises a plurality of sub-pixels, and a plurality of sub-pixels are surrounded around each fingerprint identification unit; the fingerprint identification units arranged in an array comprise a plurality of fingerprint identification unit groups, and each fingerprint identification unit group comprises m rows and n columns of fingerprint identification units; further comprising:
a control unit to:
controlling all sub-pixels in the fingerprint identification unit group to emit light, and collecting a first fingerprint identification signal by the ith row and jth column fingerprint identification units;
in the fingerprint identification unit group, sub-pixels adjacent to the fingerprint identification unit in the ith row and the jth column do not emit light, other sub-pixels emit light, and the fingerprint identification unit in the ith row and the jth column collects a second fingerprint identification signal;
acquiring a difference signal of the first fingerprint identification signal and the second fingerprint identification signal, wherein the difference signal is used as a fingerprint identification signal of an ith row and a jth column fingerprint identification unit;
circularly executing the fingerprint identification operation until the fingerprint identification signals of all the fingerprint identification units are acquired;
wherein m is more than or equal to 3, n is more than or equal to 3, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, and m, n, i and j are integers.
8. The display panel according to claim 7, further comprising a plurality of touch units arranged in an array, wherein each touch unit covers a plurality of fingerprint identification unit groups;
the control unit is also used for detecting the coverage area of the touch main body through the touch control unit.
9. The display panel according to claim 7, wherein the display panel comprises a display area, at least a portion of the display area is a fingerprint identification area, and the fingerprint identification unit is located in the fingerprint identification area;
in the fingerprint identification area, the pixel units are arranged in one-to-one correspondence with the fingerprint identification units.
10. The display panel according to claim 9, wherein at least two fingerprint identification units are adjacently disposed in the fingerprint identification area.
11. The display panel according to claim 7, wherein the display panel is a liquid crystal display panel or an organic light emitting display panel.
12. A display device comprising the display panel according to any one of claims 7 to 11.
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| CN113469028B (en) * | 2021-06-30 | 2022-09-20 | 厦门天马微电子有限公司 | Fingerprint identification module, driving method and display device |
| CN114445867B (en) * | 2022-02-21 | 2024-07-23 | 厦门天马微电子有限公司 | Fingerprint identifier and display device |
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| CN105139793A (en) * | 2015-08-28 | 2015-12-09 | 京东方科技集团股份有限公司 | Array substrate, driving method therefor, display panel, and display device |
| CN108182424A (en) * | 2018-01-29 | 2018-06-19 | 上海天马微电子有限公司 | Display device and fingerprint identification method thereof |
| CN108664895A (en) * | 2018-04-12 | 2018-10-16 | 厦门天马微电子有限公司 | Display device and its fingerprint identification method |
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| CN106981503B (en) * | 2017-04-27 | 2019-11-15 | 上海天马微电子有限公司 | Display panel and electronic equipment |
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| CN105139793A (en) * | 2015-08-28 | 2015-12-09 | 京东方科技集团股份有限公司 | Array substrate, driving method therefor, display panel, and display device |
| CN108182424A (en) * | 2018-01-29 | 2018-06-19 | 上海天马微电子有限公司 | Display device and fingerprint identification method thereof |
| CN108664895A (en) * | 2018-04-12 | 2018-10-16 | 厦门天马微电子有限公司 | Display device and its fingerprint identification method |
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