CN110928068B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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- CN110928068B CN110928068B CN201911190101.9A CN201911190101A CN110928068B CN 110928068 B CN110928068 B CN 110928068B CN 201911190101 A CN201911190101 A CN 201911190101A CN 110928068 B CN110928068 B CN 110928068B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
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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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention discloses a display panel, a driving method thereof and a display device, and relates to the technical field of display, wherein the display panel comprises a plurality of gate lines and data lines, the gate lines and the data lines are crossed to define a plurality of sub-pixel areas, and the sub-pixel areas are provided with pixel electrodes and thin film transistors; the display panel further comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit, and the driving method comprises the following steps: the control circuit judges whether to carry out fingerprint detection; if yes, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first reporting rate; if not, the control circuit scans the touch detection unit in a second scanning mode, and the second scanning mode adopts a second reporting rate; wherein the first reporting rate is less than the second reporting rate. The invention effectively improves the fingerprint detection performance and the fingerprint detection rate of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a driving method thereof and a display device.
Background
Fingerprints are inherent to everyone, and with the development of science and technology, a variety of display devices with fingerprint identification functions, such as mobile phones, tablet computers, intelligent wearable devices and the like, appear in the market. Before a user operates the display device with the fingerprint identification function, the user only needs to touch the display device with a finger to carry out authority verification, the authority verification process is simplified, and the fingerprint identification area gradually evolves from a partial area to full-screen identification along with the gradual increase of the application scenes of the fingerprint identification function.
In the existing display device based on the optical fingerprint identification technology, a light sensation fingerprint sensor is formed based on a semiconductor device, fingerprint detection is realized by utilizing the characteristic that the semiconductor device generates leakage current when being irradiated by light, specifically, after light generated by a fingerprint identification light source is reflected on the surface of a finger and the touch of the display device, the reflected light irradiates the fingerprint identification sensor, and the light sensation fingerprint sensor detects the light intensity caused by the fluctuation of fingerprint valleys, so that a fingerprint spectrum is generated. However, the conventional light-sensitive fingerprint sensor needs a long measurement time to ensure that the discharge effect generated by the finger touch is large enough to detect the difference between the fingerprint ridge and the fingerprint valley, so that the conventional display device based on the optical fingerprint identification technology has poor fingerprint detection performance and poor fingerprint detection rate.
Disclosure of Invention
In view of this, the present invention provides a display panel, a driving method thereof and a display device, which effectively improve the fingerprint detection performance and the fingerprint detection rate of the display panel.
In a first aspect, the present invention provides a driving method for a display panel, the display panel includes a plurality of gate lines and data lines, the gate lines and the data lines intersect to define a plurality of sub-pixel regions, each sub-pixel region has a pixel electrode and a thin film transistor, a control terminal of the thin film transistor is electrically connected to the gate line, a first electrode of the thin film transistor is electrically connected to the data line, and a second electrode of the thin film transistor is electrically connected to the pixel electrode; the display panel further comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit, and the driving method comprises the following steps: the control circuit judges whether to carry out fingerprint detection; if yes, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first reporting rate; if not, the control circuit scans the touch detection unit in a second scanning mode, and the second scanning mode adopts a second reporting rate; wherein the first reporting rate is less than the second reporting rate.
In a second aspect, the present invention provides a display panel comprising: the pixel structure comprises a plurality of gate lines and a plurality of data lines, wherein the gate lines and the data lines are crossed to define a plurality of sub-pixel areas, each sub-pixel area is provided with a pixel electrode and a thin film transistor, the control end of each thin film transistor is electrically connected with the gate line, the first pole of each thin film transistor is electrically connected with the data line, and the second pole of each thin film transistor is electrically connected with the pixel electrode; the display panel also comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit; the control circuit is used for judging whether fingerprint detection is carried out or not; when fingerprint detection is carried out, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first reporting rate; when the fingerprint detection is not carried out, the control circuit scans the touch detection unit in a second scanning mode, and the second scanning mode adopts a second reporting rate; wherein the first reporting rate is less than the second reporting rate.
In a third aspect, the present invention provides a display device comprising: the display panel is the display panel provided by the invention; the backlight module comprises a plurality of light-emitting units which are arranged in an array.
Compared with the prior art, the display panel, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
the display panel applying the driving method comprises a plurality of gate lines and a plurality of data lines, wherein the gate lines and the data lines are crossed to define a plurality of sub-pixel areas, each sub-pixel area is provided with a pixel electrode and a thin film transistor, the control end of each thin film transistor is electrically connected with the gate line, the first pole of each thin film transistor is electrically connected with the data line, and the second pole of each thin film transistor is electrically connected with the pixel electrode. The display panel further comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit. The control circuit in the display panel judges whether fingerprint detection is carried out, when the fingerprint detection is required, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first report rate; when the fingerprint detection is not needed, the control circuit scans the touch detection unit in a second scanning mode, the control circuit does not need to scan the fingerprint identification unit, and the second scanning mode adopts a second reporting rate. The first report rate is less than the second report rate, i.e. the number of times of scanning all the touch detection units per second and uploading touch point signals to the control circuit when fingerprint detection is required is less than the number of times of scanning all the touch detection units per second and uploading touch point signals to the control circuit when fingerprint detection is not required, since the time for completing scanning all the touch detection units at a time and uploading the touch point signals to the control circuit is fixed, therefore, compared to the time required for scanning the touch detection unit every second when fingerprint detection is not required, when fingerprint detection is required, the time required for scanning the touch detection unit per second is shorter, the saved time can be used for the control circuit to scan the fingerprint identification unit, therefore, the time for the control circuit to scan the fingerprint identification unit is increased when fingerprint detection is needed, and the fingerprint detection performance and the fingerprint detection rate of the display panel are effectively improved. When fingerprint identification is required, a user does not perform too many touch actions such as multi-point touch, sliding touch and the like, that is, the requirement on the touch detection performance of the display panel is not high, and when fingerprint identification is required, the report rate of the control circuit when scanning the touch detection unit is reduced, and the requirement of the user on the touch detection performance of the display panel cannot be influenced.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic plan view of a display panel according to the present invention;
FIG. 2 is a flow chart illustrating a driving method of a display panel according to the present invention;
FIG. 3 is a flow chart of another driving method of a display panel according to the present invention;
FIG. 4 is a flow chart illustrating a driving method of a display panel according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a driving timing sequence of the driving method of the display panel provided by the present invention when the fingerprint detection is not performed;
FIG. 6 is a schematic diagram of a driving timing sequence of the driving method of the display panel according to the present invention during fingerprint detection;
FIG. 7 is an equivalent circuit diagram of a fingerprint identification unit provided by the present invention;
FIG. 8 is a schematic plan view of another display panel provided in the present invention;
FIG. 9 is a schematic plan view of a display panel according to another embodiment of the present invention;
FIG. 10 is a schematic plan view of a display device according to the present invention;
fig. 11 is a schematic plan view of the backlight module in the display device shown in fig. 10.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic plan view of a display panel according to the present invention, and fig. 2 is a schematic flow chart of a driving method of a display panel according to the present invention, where the present embodiment provides a driving method of a display panel, and referring to fig. 1, the display panel includes a plurality of gate lines G and a plurality of data lines D, the gate lines G and the data lines D intersect to define a plurality of sub-pixel regions 10, the sub-pixel regions 10 are provided with pixel electrodes 11 and thin film transistors 12, control terminals of the thin film transistors 12 are electrically connected to the gate lines G, first poles of the thin film transistors 12 are electrically connected to the data lines D, and second poles of the thin film transistors 12 are electrically connected to the pixel electrodes 11; the display panel further includes a plurality of touch detection units 20, a plurality of fingerprint recognition units 30, and a control circuit 40.
Referring to fig. 2, the driving method includes:
if yes, go to step 102; if not, go to step 103;
103, the control circuit scans the touch detection unit in a second scanning mode, wherein the second scanning mode adopts a second reporting rate;
wherein the first reporting rate is less than the second reporting rate.
Specifically, with reference to fig. 1, the display panel to which the driving method of the present application is applied includes a plurality of gate lines G and a plurality of data lines D, the gate lines G and the data lines D intersect to define a plurality of sub-pixel regions 10, each sub-pixel region 10 is provided with a pixel electrode 11 and a thin film transistor 12, a control terminal of the thin film transistor 12 is electrically connected to the gate line G, a first electrode of the thin film transistor 12 is electrically connected to the data line D, and a second electrode of the thin film transistor 12 is electrically connected to the pixel electrode 11. The display panel further includes a plurality of touch detection units 20, a plurality of fingerprint identification units 30 and a control circuit 40, and the gate lines G, the data lines D, the touch detection units 20 and the fingerprint identification units 30 are all electrically connected to the control circuit 40, that is, the pixel electrodes 11 can be charged through the control circuit 40, so that the display panel can display images. The touch detection unit 20 is scanned by the control circuit 40 and determines a touch position according to the received signal. The fingerprint identification unit 30 is scanned by the control circuit 40 and forms fingerprint information from the received signal. Optionally, in some embodiments, the display panel further includes a gate driving circuit, and the gate line G is electrically connected to the control circuit 40 through the gate driving circuit.
It should be noted that fig. 1 exemplarily shows the structure and the position relationship of the sub-pixel region 10, the fingerprint identification unit 30 and the touch detection unit 20 in the display panel, in other embodiments of the present invention, the sub-pixel region 10, the fingerprint identification unit 30 and the touch detection unit 20 may be set according to actual production requirements, and the present invention is not limited thereto.
With reference to fig. 1 and fig. 2, the control circuit 40 in the display panel determines whether to perform fingerprint detection, and when the fingerprint detection is required, the control circuit 40 scans the touch detection unit 20 and the fingerprint identification unit 30 in a first scanning manner, where the first scanning manner adopts a first reporting rate; when the fingerprint detection is not required, the control circuit 40 scans the touch detection unit 20 in a second scanning manner, the control circuit 40 does not need to scan the fingerprint identification unit 30, and the second scanning manner adopts a second reporting rate. The reporting rate in the present application is the number of times that all the touch detection units 20 are scanned and touch point signals are uploaded to the control circuit 40 every second in the display panel. The first reporting rate is less than the second reporting rate, i.e. the number of times of scanning all the touch detection units 20 and uploading touch point signals to the control circuit 40 per second when fingerprint detection is required is less than the number of times of scanning all the touch detection units 20 and uploading touch point signals to the control circuit 40 per second when fingerprint detection is not required, because the time of scanning all the touch detection units 20 and uploading touch point signals to the control circuit 40 at one time is fixed, compared with the time of scanning the touch detection units 20 per second when fingerprint detection is not required, the time required for scanning the touch detection units 20 per second when fingerprint detection is required is less, the saved time can be used for the control circuit 40 to scan the fingerprint identification unit 30, so that the time of scanning the fingerprint identification unit 30 by the control circuit 40 when fingerprint detection is required is increased, therefore, the fingerprint detection performance and the fingerprint detection rate of the display panel are effectively improved. When fingerprint identification is required, the user does not perform too many touch actions such as multi-touch, sliding touch and the like, that is, the requirement on the touch detection performance of the display panel is not high, and when fingerprint identification is required, the report rate of scanning the touch detection unit 20 by the control circuit 40 is reduced, and the requirement on the touch detection performance of the display panel by the user is not influenced.
Fig. 3 is a schematic flow chart of another driving method of a display panel provided in the present invention, and referring to fig. 3, optionally, the driving method of the display panel further includes:
when fingerprint detection is needed, step 104 is executed;
104, judging whether the fingerprints acquired by the fingerprint identification unit are matched by the control circuit;
if yes, go to step 103; if not, go to step 102.
Specifically, referring to fig. 1 and fig. 3, when fingerprint detection is required, step 102 is executed, in which the control circuit 40 scans the touch detection unit 20 in a first scanning manner, and the scanning fingerprint identification unit 30 collects a fingerprint; and the control circuit 40 determines whether the fingerprints collected by the fingerprint identification unit 30 match in step 104. When the fingerprints collected by the fingerprint identification unit 30 match, the control circuit 40 scans the touch detection unit 20 in the second scanning manner, and stops scanning the fingerprint identification unit 30. When the fingerprints collected by the fingerprint identification unit 30 are not matched, the control circuit 40 scans the touch detection unit 20 in the first scanning manner, and continues to scan the fingerprint identification unit 30.
When the fingerprints collected by the fingerprint identification unit 30 are matched, the fingerprint identification is completed, the control circuit 40 stops scanning the fingerprint identification unit 30, and scans the touch detection unit 20 in the second scanning manner, that is, the touch rate when the control circuit 40 scans the touch detection unit 20 is recovered to the second touch rate, so that the touch detection performance requirement of the user on the display panel is prevented from being influenced. When the fingerprints collected by the fingerprint identification unit 30 are not matched, the fingerprint identification is not completed, the control circuit 40 scans the touch detection unit 20 in the first scanning manner, and continues to scan the fingerprint identification unit 30.
Fig. 4 is a schematic flow chart of a driving method of a display panel provided by the present invention, and referring to fig. 4, optionally, the driving method of the display panel further includes:
when the fingerprints collected by the fingerprint identification unit are not matched, executing step 105;
105, judging whether the times of detecting the fingerprints acquired by the fingerprint identification unit exceed a first threshold value by a control circuit; if yes, go to step 103; if not, go to step 102.
Specifically, with continued reference to fig. 1 and 4, the control circuit 40 determines whether the fingerprints collected by the fingerprint identification unit 30 match, and when the fingerprints collected by the fingerprint identification unit 30 do not match, step 105 is executed, that is, the control circuit 40 determines whether the number of times of detecting the fingerprints collected by the fingerprint identification unit 30 exceeds the first threshold. When the number of times of detecting the fingerprint collected by the fingerprint identification unit 30 exceeds the first threshold, the control circuit 40 scans the touch detection unit 20 in the second scanning manner, and stops scanning the fingerprint identification unit 30; when the number of times of detecting the fingerprint collected by the fingerprint identification unit 30 does not exceed the first threshold, the control circuit 40 scans the touch detection unit 20 in the first scanning manner, and continues to scan the fingerprint identification unit 30.
When the fingerprints collected by the fingerprint identification unit 30 are matched, the fingerprint identification is completed, the control circuit 40 stops scanning the fingerprint identification unit 30, and scans the touch detection unit 20 in the second scanning manner, that is, the touch rate when the control circuit 40 scans the touch detection unit 20 is recovered to the second touch rate, so that the touch detection performance requirement of the user on the display panel is prevented from being influenced. When the fingerprints collected by the fingerprint identification unit 30 are not matched, the fingerprint identification is not completed, the control circuit 40 judges whether the number of times of detecting the fingerprints collected by the fingerprint identification unit 30 exceeds a first threshold value, and when the number of times of detecting the fingerprints collected by the fingerprint identification unit 30 does not exceed the first threshold value, the control circuit 40 scans the touch detection unit 20 in a first scanning mode and continues to scan the fingerprint identification unit 30; when the number of times of detecting the fingerprint collected by the fingerprint identification unit 30 exceeds the first threshold, the fingerprint identification unit 30 stops being scanned, and the control circuit 40 scans the touch detection unit 20 in the second scanning manner. Effectively avoid when the fingerprint that fingerprint identification unit 30 gathered mismatches, control circuit 40 infinitely scans fingerprint identification unit 30, influences display panel's normal use.
It should be noted that, in the present application, the number of times of detecting the fingerprint acquired by the fingerprint identification unit refers to the number of times of the control circuit completing scanning all the fingerprint identification units, so that the fingerprint identification unit acquires the fingerprint and uploads the fingerprint to the control circuit.
In addition, it should be noted that the first threshold may be set according to actual requirements, and for example, the first threshold may be 6 or 8, which is not limited in the present invention.
Fig. 5 is a schematic diagram of a driving timing sequence of the driving method of the display panel provided by the present invention when the fingerprint detection is not performed, fig. 6 is a schematic diagram of a driving timing sequence of the driving method of the display panel provided by the present invention when the fingerprint detection is performed, and next, a driving process of the driving method of the display panel in the present application will be further described with reference to fig. 1, fig. 5, and fig. 6, so that the technical effect thereof can be more clearly embodied.
Optionally, the control circuit sends out a plurality of periodic scan control signals, and each period T includes a plurality of frames of scan time F.
Referring to fig. 5, when fingerprint detection is not performed, each frame scanning time F in each period T includes a touch detection time T1 and a display scanning time T2.
Referring to fig. 6, when performing fingerprint detection, a portion of the frame scanning time F in each period T includes a touch detection time T1 and a display scanning time T2, and the rest of the frame scanning time F includes a fingerprint detection time T3 and a display scanning time T2.
During the touch detection time t1, the control circuit 40 scans the touch detection unit 20; during the display scan time t2, the control circuit 40 sequentially scans the gate lines G and transmits data voltage signals to the pixel electrodes 11 through the data lines D; during the fingerprint detection time t3, the control circuit 40 scans the fingerprint identification unit 30.
Specifically, the control circuit 40 sends out a plurality of periodic scanning control signals, each period T includes a plurality of frames of scanning time F, when fingerprint detection is not performed, each frame of scanning time F in each period T includes touch detection time T1 and display scanning time T2, during touch detection time T1, the control circuit 40 scans the touch detection unit 20, during display scanning time T2, the control circuit 40 sequentially scans the gate lines G and transmits data voltage signals to the pixel electrodes 11 through the data lines D. When fingerprint detection is performed, a part of the frame scanning time F in each period T includes a touch detection time T1 and a display scanning time T2, and the rest of the frame scanning time F includes a fingerprint detection time T3 and a display scanning time T2, and in the touch detection time T1, the control circuit 40 scans the touch detection unit 20; during the display scan time t2, the control circuit 40 sequentially scans the gate lines G and transmits data voltage signals to the pixel electrodes 11 through the data lines D; during the fingerprint detection time t3, the control circuit 40 scans the fingerprint identification unit 30. When fingerprint detection is performed, the original touch detection time T1 in the partial frame scanning time F in each period T is used as the fingerprint detection time T3, so that the time for the control circuit 40 to scan the fingerprint identification unit 30 in each period T is increased when fingerprint detection is required, and the fingerprint detection performance and the fingerprint detection rate of the display panel are effectively improved.
Whether fingerprint detection is performed or not, the duration of the display scanning time t2 in each frame of scanning time F is the same, that is, the control circuit 40 does not need to occupy the display scanning time t2 for scanning the fingerprint identification unit 30, and the display quality of the display panel is not affected by the control circuit 40 for scanning the fingerprint identification unit 30. When fingerprint identification is required, a user does not perform too many touch actions such as multi-point touch, sliding touch and the like, that is, the requirement on the touch detection performance of the display panel is not high, so that even when fingerprint identification is required, the original touch detection time T1 in the partial frame scanning time F in each period T is used as the fingerprint detection time T3, the total duration of the touch detection time T1 in each period T is reduced, and the requirement on the touch detection performance of the display panel by the user is not influenced.
Optionally, the first reporting rate is 10Hz, and the second reporting rate is 120 Hz.
It should be noted that, in this embodiment, the first reporting rate is exemplarily shown to be 10Hz, and the second reporting rate is 120Hz, in other embodiments of the present invention, the first reporting rate and the second reporting rate may also be set to other values according to actual production requirements, and the present invention is not described herein again.
Fig. 7 is an equivalent circuit diagram of a fingerprint identification unit according to the present invention, referring to fig. 7, optionally, wherein the fingerprint identification unit 30 includes a photodiode 31, a first thin film transistor K1, a second thin film transistor K2, a third thin film transistor K3, a fourth thin film transistor K4, and a storage capacitor C1;
a first pole of the photodiode 31 is electrically connected to a first pole of the first thin film transistor K1, and a second pole of the photodiode 31 is connected to a bias voltage Vbias;
the gate of the first thin film transistor K1 is connected to the first control signal terminal 32, and the second pole of the first thin film transistor K1 is electrically connected to the gate of the third thin film transistor K3;
a gate of the second thin film transistor K2 is connected to the second control signal terminal 33, a first pole of the second thin film transistor K2 is connected to the first voltage signal terminal VDD, and a second pole of the second thin film transistor K2 is electrically connected to the second pole of the first thin film transistor K1;
a first electrode of the third thin film transistor K3 is connected to the first voltage signal terminal VDD, and a second electrode of the third thin film transistor K3 is connected to the first electrode of the fourth thin film transistor K4;
a gate third control signal terminal 34 of the fourth thin film transistor K4, a second pole of the fourth thin film transistor K4 being electrically connected to the voltage output signal line 35;
a first terminal of the storage capacitor C1 is electrically connected to the second terminal of the first thin film transistor K1, and a second terminal of the storage capacitor C1 is connected to the bias voltage Vbias.
Specifically, when fingerprint identification is performed, the fingerprint identification circuit comprises a reset stage, an exposure stage and an electric signal output stage.
In the reset phase, the first thin film transistor K1 is turned on in response to the control signal sent by the first control signal terminal 32, the second thin film transistor K2 is turned on in response to the control signal sent by the second control signal terminal 33, and the fourth thin film transistor K4 is turned on in response to the control signal sent by the third control signal terminal 34, so that the fingerprint identification circuit 30 is reset;
in the exposure stage, a finger touches the screen, the light source is reflected when irradiating the valley line and the ridge line of the finger fingerprint, and because the reflection angles of the valley line and the ridge line and the reflected illumination intensity are different, the light is projected onto the light sensing diode 31, so that the resistance value of the light sensing diode 31 is changed, electric charges are generated, and light sensing current is formed;
in the electrical signal outputting stage, after the photo current flows through the first thin film transistor K1, the first thin film transistor K1 generates a voltage signal, the voltage signal controls the third thin film transistor K3 to be turned on, the fourth thin film transistor K4 is turned on in response to the control signal sent from the third control signal terminal 34, and the voltage signal is outputted through the signal output terminal Vout of the voltage output signal line 35.
The fingerprint identification unit circuit provided in the embodiment of the invention is a 4T1D structure, and compared with the circuit structure of 1T1D in the prior art, the circuit structure has stronger anti-interference capability and can improve the signal-to-noise ratio.
Optionally, the first scanning mode and the second scanning mode are both a mutual capacitance scanning mode or a self-capacitance scanning mode.
Specifically, fig. 8 is a schematic plane structure diagram of another display panel provided by the present invention, and referring to fig. 8, when the display panel is a self-capacitance touch display panel, that is, when the display panel includes a plurality of touch electrodes 51 arranged in an array, both the first scanning manner and the second scanning manner are self-capacitance scanning manners.
Fig. 9 is a schematic plan view of another display panel according to the present invention, and referring to fig. 9, when the display panel is a mutual capacitive touch display panel, that is, when the display panel includes a plurality of touch driving electrodes 52 extending along a first direction X and touch sensing electrodes 53 extending along a second direction Y, both the first scanning manner and the second scanning manner are mutual capacitive scanning manners, and the first direction X intersects the second direction Y.
With continued reference to fig. 1, the present embodiment provides a display panel, including: the display panel comprises a plurality of gate lines G and a plurality of data lines D, wherein the gate lines G and the data lines D are intersected to define a plurality of sub-pixel regions 10, each sub-pixel region 10 is provided with a pixel electrode 11 and a thin film transistor 12, the control end of each thin film transistor 12 is electrically connected with the gate line G, the first pole of each thin film transistor 12 is electrically connected with the data line D, and the second pole of each thin film transistor 12 is electrically connected with the pixel electrode 11;
the display panel further comprises a plurality of touch detection units 20, a plurality of fingerprint identification units 30 and a control circuit 40;
a control circuit 40 for judging whether to perform fingerprint detection;
when detecting a fingerprint, the control circuit 40 scans the touch detection unit 20 and the fingerprint identification unit 30 in a first scanning manner, where the first scanning manner adopts a first reporting rate;
when the fingerprint detection is not performed, the control circuit 40 scans the touch detection unit in a second scanning mode, wherein the second scanning mode adopts a second reporting rate; wherein the content of the first and second substances,
the first reporting rate is less than the second reporting rate.
Specifically, the display panel provided in this embodiment includes a plurality of gate lines G and a plurality of data lines D, the gate lines G and the data lines D intersect to define a plurality of sub-pixel regions 10, each sub-pixel region 10 is provided with a pixel electrode 11 and a thin film transistor 12, a control terminal of the thin film transistor 12 is electrically connected to the gate line G, a first pole of the thin film transistor 12 is electrically connected to the data line D, and a second pole of the thin film transistor 12 is electrically connected to the pixel electrode 11. The display panel further includes a plurality of touch detection units 20, a plurality of fingerprint recognition units 30, and a control circuit 40. The gate line G, the data line D, the touch detection unit 20 and the fingerprint identification unit 30 are all electrically connected to the control circuit 40, that is, the control circuit 40 can charge the pixel electrode 11, so as to display the image on the display panel. The touch detection unit 20 is scanned by the control circuit 40 and determines a touch position according to the received signal. The fingerprint identification unit 30 is scanned by the control circuit 40 and forms fingerprint information from the received signal.
The control circuit 40 in the display panel is used for judging whether fingerprint detection is performed, and when the fingerprint detection is required, the control circuit 40 scans the touch detection unit 20 and the fingerprint identification unit 30 in a first scanning mode, wherein the first scanning mode adopts a first report rate; when the fingerprint detection is not required, the control circuit 40 scans the touch detection unit 20 in a second scanning manner, the control circuit 40 does not need to scan the fingerprint identification unit 30, and the second scanning manner adopts a second reporting rate. The first reporting rate is less than the second reporting rate, i.e. the number of times of scanning all the touch detection units 20 and uploading touch point signals to the control circuit 40 per second when fingerprint detection is required is less than the number of times of scanning all the touch detection units 20 and uploading touch point signals to the control circuit 40 per second when fingerprint detection is not required, because the time of scanning all the touch detection units 20 and uploading touch point signals to the control circuit 40 at one time is fixed, compared with the time of scanning the touch detection units 20 per second when fingerprint detection is not required, the time required for scanning the touch detection units 20 per second when fingerprint detection is required is less, the saved time can be used for the control circuit 40 to scan the fingerprint identification unit 30, so that the time of scanning the fingerprint identification unit 30 by the control circuit 40 when fingerprint detection is required is increased, therefore, the fingerprint detection performance and the fingerprint detection rate of the display panel are effectively improved. When fingerprint identification is required, the user does not perform too many touch actions such as multi-touch, sliding touch and the like, that is, the requirement on the touch detection performance of the display panel is not high, and when fingerprint identification is required, the report rate of scanning the touch detection unit 20 by the control circuit 40 is reduced, and the requirement on the touch detection performance of the display panel by the user is not influenced.
With continued reference to fig. 1, optionally, wherein the control circuit 40 is further configured to determine whether the fingerprints collected by the fingerprint identification unit 30 match;
when the fingerprints collected by the fingerprint identification unit 30 are matched, the control circuit 40 scans the touch detection unit 20 in a second scanning manner, and stops scanning the fingerprint identification unit 30;
when the fingerprints collected by the fingerprint identification unit 30 are not matched, the control circuit 40 scans the touch detection unit 20 in the first scanning manner, and continues to scan the fingerprint identification unit 30.
Specifically, the control circuit 40 is further configured to determine whether the fingerprints collected by the fingerprint identification unit 30 are matched, and when the fingerprints collected by the fingerprint identification unit 30 are matched, the fingerprint identification is completed, the control circuit 40 stops scanning the fingerprint identification unit 30, and scans the touch detection unit 20 in the second scanning manner, that is, the touch rate when the control circuit 40 scans the touch detection unit 20 is recovered to the second touch rate, so as to avoid affecting the touch detection performance requirement of the user on the display panel. When the fingerprints collected by the fingerprint identification unit 30 are not matched, the fingerprint identification is not completed, the control circuit 40 scans the touch detection unit 20 in the first scanning manner, and continues to scan the fingerprint identification unit 30.
With continued reference to fig. 1, optionally, wherein, when the fingerprints collected by the fingerprint identification unit 30 do not match, the control circuit 40 is further configured to determine whether the number of times of detecting the fingerprints collected by the fingerprint identification unit 30 exceeds a first threshold;
when the number of times of detecting the fingerprint collected by the fingerprint identification unit 30 exceeds the first threshold, the control circuit 40 scans the touch detection unit 20 in the second scanning manner, and stops scanning the fingerprint identification unit 30;
when the number of times of detecting the fingerprint collected by the fingerprint identification unit 30 does not exceed the first threshold, the control circuit 4 scans the touch detection unit 20 in the first scanning manner, and continues to scan the fingerprint identification unit 30.
Specifically, when the fingerprints collected by the fingerprint identification unit 30 are matched, the fingerprint identification is completed, the control circuit 40 stops scanning the fingerprint identification unit 30, and scans the touch detection unit 20 in the second scanning manner, that is, the hit rate when the control circuit 40 scans the touch detection unit 20 is recovered to the second hit rate, so as to avoid affecting the touch detection performance requirement of the user on the display panel. When the fingerprints collected by the fingerprint identification unit 30 are not matched, the fingerprint identification is not completed, the control circuit 40 is further configured to determine whether the number of times of detecting the fingerprints collected by the fingerprint identification unit 30 exceeds a first threshold, and when the number of times of detecting the fingerprints collected by the fingerprint identification unit 30 does not exceed the first threshold, the control circuit 40 scans the touch detection unit 20 in a first scanning manner and continues to scan the fingerprint identification unit 30; when the number of times of detecting the fingerprint collected by the fingerprint identification unit 30 exceeds the first threshold, the fingerprint identification unit 30 stops being scanned, and the control circuit 40 scans the touch detection unit 20 in the second scanning manner. Effectively avoid when the fingerprint that fingerprint identification unit 30 gathered mismatches, control circuit 40 infinitely scans fingerprint identification unit 30, influences display panel's normal use.
Fig. 10 is a schematic plan view illustrating a display device according to the present invention, fig. 11 is a schematic plan view illustrating a backlight module in the display device illustrated in fig. 10, and referring to fig. 10 and fig. 11, the present embodiment provides a display device including: the display panel 100 and the backlight module 200, wherein the display panel is the display panel 100 provided by the invention;
the backlight module 200 includes a plurality of light emitting units 210 arranged in an array.
Specifically, the display device 1000 provided in this embodiment includes a display panel 100 and a backlight module 200, where the display panel is the display panel 100 provided in any of the above embodiments of the present invention. The backlight module 200 includes a plurality of light emitting units 210 arranged in an array, and the light emitting units 210 provide light sources for the fingerprint identification unit. The embodiment of fig. 8 only takes a mobile phone as an example to describe the display device 1000, and it should be understood that the display device provided in the embodiment of the present invention may be other display devices with a display function, such as a computer, a television, a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the display panel provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel in each of the above embodiments, which is not repeated herein.
As can be seen from the above embodiments, the display panel, the driving method thereof, and the display device provided by the present invention at least achieve the following advantages:
the display panel applying the driving method comprises a plurality of gate lines and a plurality of data lines, wherein the gate lines and the data lines are crossed to define a plurality of sub-pixel areas, each sub-pixel area is provided with a pixel electrode and a thin film transistor, the control end of each thin film transistor is electrically connected with the gate line, the first pole of each thin film transistor is electrically connected with the data line, and the second pole of each thin film transistor is electrically connected with the pixel electrode. The display panel further comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit. The control circuit in the display panel judges whether fingerprint detection is carried out, when the fingerprint detection is required, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first report rate; when the fingerprint detection is not needed, the control circuit scans the touch detection unit in a second scanning mode, the control circuit does not need to scan the fingerprint identification unit, and the second scanning mode adopts a second reporting rate. The first report rate is less than the second report rate, i.e. the number of times of scanning all the touch detection units per second and uploading touch point signals to the control circuit when fingerprint detection is required is less than the number of times of scanning all the touch detection units per second and uploading touch point signals to the control circuit when fingerprint detection is not required, since the time for completing scanning all the touch detection units at a time and uploading the touch point signals to the control circuit is fixed, therefore, compared to the time required for scanning the touch detection unit every second when fingerprint detection is not required, when fingerprint detection is required, the time required for scanning the touch detection unit per second is shorter, the saved time can be used for the control circuit to scan the fingerprint identification unit, therefore, the time for the control circuit to scan the fingerprint identification unit is increased when fingerprint detection is needed, and the fingerprint detection performance and the fingerprint detection rate of the display panel are effectively improved. When fingerprint identification is required, a user does not perform too many touch actions such as multi-point touch, sliding touch and the like, that is, the requirement on the touch detection performance of the display panel is not high, and when fingerprint identification is required, the report rate of the control circuit when scanning the touch detection unit is reduced, and the requirement of the user on the touch detection performance of the display panel cannot be influenced.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. The driving method of the display panel is characterized in that the display panel comprises a plurality of gate lines and a plurality of data lines, the gate lines and the data lines are crossed to define a plurality of sub-pixel areas, each sub-pixel area is provided with a pixel electrode and a thin film transistor, the control end of each thin film transistor is electrically connected with the gate line, the first pole of each thin film transistor is electrically connected with the corresponding data line, and the second pole of each thin film transistor is electrically connected with the corresponding pixel electrode;
the display panel further comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit, and the driving method comprises the following steps:
the control circuit judges whether to perform fingerprint detection;
if yes, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first reporting rate;
if not, the control circuit scans the touch detection unit in a second scanning mode, and the second scanning mode adopts a second reporting rate; wherein the content of the first and second substances,
the first reporting rate is less than the second reporting rate.
2. The method for driving a display panel according to claim 1, further comprising:
when fingerprint detection is required, the control circuit judges whether the fingerprints acquired by the fingerprint identification unit are matched;
if so, the control circuit scans the touch detection unit in the second scanning mode and stops scanning the fingerprint identification unit;
if not, the control circuit scans the touch detection unit in the first scanning mode and continues to scan the fingerprint identification unit.
3. The method for driving a display panel according to claim 2, further comprising:
when the fingerprints collected by the fingerprint identification unit are not matched, the control circuit judges whether the frequency of detecting the fingerprints collected by the fingerprint identification unit exceeds a first threshold value or not;
if so, the control circuit scans the touch detection unit in the second scanning mode and stops scanning the fingerprint identification unit;
if not, the control circuit scans the touch detection unit in the first scanning mode and continues to scan the fingerprint identification unit.
4. The method for driving a display panel according to claim 1,
the control circuit sends out a plurality of periodic scanning control signals, and each period comprises multi-frame scanning time;
when fingerprint detection is not carried out, the scanning time of each frame in each period comprises touch detection time and display scanning time;
when fingerprint detection is carried out, scanning time of a part of frames in each period comprises touch detection time and display scanning time, and scanning time of the rest frames comprises fingerprint detection time and display scanning time;
in the touch detection time, the control circuit scans the touch detection unit; in the display scanning time, the control circuit sequentially scans the gate lines and transmits data voltage signals to the pixel electrodes through the data lines; and in the fingerprint detection time, the control circuit scans the fingerprint identification unit.
5. The method for driving a display panel according to claim 1,
the first reporting rate is 10Hz, and the second reporting rate is 120 Hz.
6. The method for driving a display panel according to claim 1,
the fingerprint identification unit comprises a light sensing diode, a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor and a storage capacitor;
a first pole of the light sensing diode is electrically connected with a first pole of the first thin film transistor, and a second pole of the light sensing diode is connected with a bias voltage;
the grid electrode of the first thin film transistor is connected with a first control signal end, and the second pole of the first thin film transistor is electrically connected with the grid electrode of the third thin film transistor;
the grid electrode of the second thin film transistor is connected with a second control signal end, the first pole of the second thin film transistor is connected with a first voltage signal end, and the second pole of the second thin film transistor is electrically connected with the second pole of the first thin film transistor;
a first pole of the third thin film transistor is connected with the first voltage signal end, and a second pole of the third thin film transistor is connected with a first pole of the fourth thin film transistor;
the grid electrode of the fourth thin film transistor is connected with a third control signal end, and the second pole of the fourth thin film transistor is electrically connected with the voltage output signal line;
the first end of the storage capacitor is electrically connected with the second pole of the first thin film transistor, and the second end of the storage capacitor is connected with the bias voltage.
7. The method for driving a display panel according to claim 1,
the first scanning mode and the second scanning mode are both a mutual capacitance scanning mode or a self-capacitance scanning mode.
8. A display panel, comprising: the pixel structure comprises a plurality of gate lines and a plurality of data lines, wherein the gate lines and the data lines are crossed to define a plurality of sub-pixel areas, each sub-pixel area is provided with a pixel electrode and a thin film transistor, the control end of each thin film transistor is electrically connected with the gate lines, the first pole of each thin film transistor is electrically connected with the data lines, and the second pole of each thin film transistor is electrically connected with the pixel electrodes;
the display panel further comprises a plurality of touch detection units, a plurality of fingerprint identification units and a control circuit;
the control circuit is used for judging whether fingerprint detection is carried out or not;
when fingerprint detection is carried out, the control circuit scans the touch detection unit in a first scanning mode, and scans the fingerprint identification unit, wherein the first scanning mode adopts a first report rate;
when the fingerprint detection is not carried out, the control circuit scans the touch detection unit in a second scanning mode, and the second scanning mode adopts a second reporting rate; wherein the content of the first and second substances,
the first reporting rate is less than the second reporting rate.
9. The display panel according to claim 8,
the control circuit is also used for judging whether the fingerprints acquired by the fingerprint identification unit are matched or not;
when the fingerprints collected by the fingerprint identification unit are matched, the control circuit scans the touch detection unit in the second scanning mode and stops scanning the fingerprint identification unit;
when the fingerprints collected by the fingerprint identification unit are not matched, the control circuit scans the touch detection unit in the first scanning mode and continues to scan the fingerprint identification unit.
10. The display panel according to claim 9,
when the fingerprints collected by the fingerprint identification unit are not matched, the control circuit is also used for judging whether the times of detecting the fingerprints collected by the fingerprint identification unit exceed a first threshold value;
when the number of times of detecting the fingerprints collected by the fingerprint identification unit exceeds the first threshold value, the control circuit scans the touch detection unit in the second scanning mode and stops scanning the fingerprint identification unit;
when the number of times of detecting the fingerprint collected by the fingerprint identification unit does not exceed the first threshold value, the control circuit scans the touch detection unit in the first scanning mode and continues to scan the fingerprint identification unit.
11. A display device, comprising: a display panel and a backlight module, wherein the display panel is the display panel of any one of claims 8-10;
the backlight module comprises a plurality of light-emitting units which are arranged in an array.
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| CN113257207B (en) * | 2021-05-25 | 2023-05-09 | 武汉华星光电技术有限公司 | Field sequential liquid crystal display device |
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