CN110796983B - Display device and driving method thereof - Google Patents
Display device and driving method thereofDownload PDFInfo
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- CN110796983B CN110796983BCN201911107062.1ACN201911107062ACN110796983BCN 110796983 BCN110796983 BCN 110796983BCN 201911107062 ACN201911107062 ACN 201911107062ACN 110796983 BCN110796983 BCN 110796983B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- 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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Human Computer Interaction (AREA)
- Liquid Crystal Display Device Control (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display device and a driving method thereof.
Background
With the development of display devices, a display device integrated with a touch function and a fingerprint recognition function provides great convenience to users. The existing fingerprint recognition technology includes an optical fingerprint recognition technology, a semiconductor silicon fingerprint recognition technology, and an ultrasonic fingerprint recognition technology. In the optical fingerprint recognition technology, a light source is generally used to irradiate a finger, and the intensity of light reflected by the valleys and ridges of the finger is different, so as to form a fingerprint image.
At present, most display devices adopt an externally-hung fingerprint identification unit, and a fingerprint identification area and a display area of the display device are separated and are provided with a light source which is used for fingerprint identification independently. However, to increase the screen ratio, the fingerprint recognition area needs to be integrated into the display area. Thus, the light source for fingerprint recognition comes from the display area, and therefore, the display panel must be lighted during fingerprint recognition. However, the display driving signal interferes with the fingerprint identification circuit, which causes abnormal fingerprint reading.
Disclosure of Invention
The invention provides a display device and a driving method thereof, which are used for preventing mutual interference among display, fingerprint identification and touch control.
In a first aspect, an embodiment of the present invention provides a display device, including:
the array substrate is provided with a pixel driving circuit, a fingerprint identification circuit and a touch electrode;
the control circuit provides a display driving signal to the pixel driving circuit in a display stage; providing a fingerprint identification driving signal to a fingerprint identification circuit in a fingerprint identification stage; providing a touch driving signal to the touch electrode in a touch stage, and providing the touch driving signal to the fingerprint identification circuit and the pixel driving circuit;
the display stage, the fingerprint identification stage and the touch stage are not overlapped in time sequence.
In a second aspect, an embodiment of the present invention further provides a method for driving a display device, where the method includes:
providing a display drive signal to the pixel drive circuit during a display phase;
providing a fingerprint identification driving signal to a fingerprint identification circuit in a fingerprint identification stage;
providing a touch driving signal to the touch electrode in a touch stage, and providing the touch driving signal to the fingerprint identification circuit and the pixel driving circuit;
the display stage, the fingerprint identification stage and the touch stage are not overlapped in time sequence.
The display device provided by the embodiment of the invention comprises a pixel driving circuit, a fingerprint identification circuit, a touch electrode and a control circuit, wherein the pixel driving circuit, the fingerprint identification circuit and the touch electrode are formed on an array substrate. The display stage, the fingerprint identification stage and the touch control stage are separated in time sequence, so that the display, the fingerprint identification and the touch control are not interfered with each other, and in the touch control stage, a signal sent to the fingerprint identification circuit is driven along with a touch control signal, so that the signal on a touch control signal line can be prevented from being interfered by parasitic capacitance, the normal touch control detection is ensured, the problem that the display and the touch control are influenced after the fingerprint identification function is integrated on the display device is solved, and the performance of the display device is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a timing diagram of driving the display device of FIG. 1;
fig. 3 is an equivalent circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 4 is another driving timing diagram of the display device of fig. 1;
FIG. 5 is a timing diagram of still another driving method of the display device of FIG. 1;
FIG. 6 is a timing diagram of still another driving method of the display device of FIG. 1;
FIG. 7 is a timing diagram of driving the display device of FIG. 1;
FIG. 8 is an equivalent circuit diagram of a fingerprint identification circuit according to an embodiment of the present invention;
FIG. 9 is a timing diagram of the fingerprint identification circuit of FIG. 8;
fig. 10 is a flowchart of a driving method of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the prior art, most display devices adopt an externally-hung fingerprint identification module, so that a light source for fingerprint identification and a light source for image display in the display device are independent. At present, in order to increase the screen ratio of the display device, it is a current trend to integrate the fingerprint recognition module into the display area. When the fingerprint recognition module is integrated in the display area, the light source for fingerprint recognition may come from the display area, and then, the display panel must be lit up during the fingerprint recognition process. However, in general, because the fingerprint identification circuit and the pixel driving circuit are both located on the array substrate, that is, the distance between the fingerprint identification circuit and the pixel driving circuit is relatively short, when the fingerprint identification circuit and the pixel driving circuit operate simultaneously, the display driving signal for driving the pixel driving circuit to operate interferes with the fingerprint identification process, and then the fingerprint reading is abnormal. Similarly, when the fingerprint identification process and the touch detection process are performed simultaneously, the fingerprint identification driving signal for driving the fingerprint identification circuit interferes with the touch detection, resulting in abnormal touch detection.
In view of this, an embodiment of the present invention provides a display device. The display device includes:
the array substrate is provided with a pixel driving circuit, a fingerprint identification circuit and a touch electrode;
the control circuit provides a display driving signal to the pixel driving circuit in a display stage; providing a fingerprint identification driving signal to a fingerprint identification circuit in a fingerprint identification stage; providing a touch driving signal to the touch electrode in a touch stage, and providing the touch driving signal to the fingerprint identification circuit and the pixel driving circuit;
the display stage, the fingerprint identification stage and the touch stage are not overlapped in time sequence.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. Based on the embodiments of the present invention, those skilled in the art can obtain all other embodiments without creative efforts, which belong to the protection scope of the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 2 is a driving timing diagram of the display device of fig. 1. Referring to fig. 1 and 2, the display device includes: the array substrate comprises anarray substrate 1, wherein apixel driving circuit 11, afingerprint identification circuit 12 and atouch electrode 13 are formed on thearray substrate 1; acontrol circuit 14, thecontrol circuit 14 providing a display drive signal to thepixel drive circuit 11 in the display phase DP; during the fingerprint identification phase FPR provides a fingerprint identification drive signal to thefingerprint identification circuit 12; providing a touch driving signal to thetouch electrode 13 and providing a touch driving signal to thefingerprint identification circuit 12 and thepixel driving circuit 11 at a touch stage TC; the display stage DP, the fingerprint identification stage FPR and the touch control stage TC are not overlapped in time sequence.
Specifically, thearray substrate 1 may be subsequently combined with a counter substrate to form a liquid crystal display panel or an organic light emitting display panel. For convenience of illustration, the following description will be given taking as an example that thearray substrate 1 and the opposite substrate (color film substrate) together constitute a liquid crystal display panel, and thepixel driving circuit 11 in thearray substrate 1 is applied to the liquid crystal display panel. Illustratively, the display device may be an electronic display device such as a vehicle-mounted display screen, a mobile phone, a computer or a television.
Specifically, in the display phase DP, thepixel driving circuit 11 is used for lighting the corresponding sub-pixels according to the display driving signal, and fig. 1 only exemplarily shows that thepixel driving circuit 11 is electrically connected to thecontrol circuit 14, and does not show the signal lines for transmitting the display driving signal in detail, for example, in general, the signal lines for transmitting the display driving signal include gate scanning lines for transmitting the scanning signal and data signal lines for transmitting the data signal. Those skilled in the art can set the number and arrangement of the signal lines for transmitting the display driving signals according to the practical implementation form of the pixel driving circuit, and the present disclosure is not limited thereto.
Exemplarily, fig. 3 is an equivalent circuit diagram of apixel driving circuit 11 according to an embodiment of the present invention. Referring to fig. 3, thepixel driving circuit 11 includes a first thin film transistor T1, a first capacitor C1, and a second capacitor C2. The control end of the first thin film transistor T1 is electrically connected to thecontrol circuit 14 through the Gate scan line Gate, the first end of the first thin film transistor T1 is electrically connected to thecontrol circuit 14 through the data signal line Source, the second end of the first thin film transistor T1 is electrically connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is grounded, and the second capacitor C2 is connected in parallel to the first capacitor C1. In the display phase DP, the operation of thepixel driving circuit 11 is: thecontrol circuit 14 supplies a scan signal to thepixel driving circuit 11 through the Gate scan line Gate to turn on the first thin film transistor T1, and at the same time, thecontrol circuit 14 supplies a display voltage to thepixel driving circuit 11 through the data signal line Source to charge the first capacitor C1 and the second capacitor C2. In this way, even after the first thin film transistor T1 is turned off, the display voltages stored in the first capacitor C1 and the second capacitor C2 can ensure that the sub-pixels are in the lighting state until all the sub-pixels in the display area are lighted. It can be understood that when the display phase DP ends, the fingerprint identification phase FPR or the touch phase TC is performed, and the display voltage stored in the first capacitor C1 and the second capacitor C2 is also used to ensure that the sub-pixels are still in the lighting state until the next display phase DP arrives.
Specifically, during the fingerprint identification phase FPR, thefingerprint identification circuit 12 is configured to receive the reflected light reflected by the touch subject for fingerprint identification, and fig. 1 shows thefingerprint identification circuit 12 and thecontrol circuit 14 as being electrically connected, and does not show the signal lines for transmitting the fingerprint identification driving signal in detail. According to the specific arrangement of thefingerprint identification circuit 12, those skilled in the art can set the number and arrangement of the signal lines for transmitting the fingerprint identification driving signal accordingly, which is not limited herein. In addition, fig. 1 only shows exemplarily that the fingerprint identification area is located in a part of the display area, and accordingly, thefingerprint identification circuit 12 is only disposed in the fingerprint identification area, but not limited to the display device in this application. The specific implementation form of thefingerprint identification circuit 12 is various, and accordingly, the working process is not the same, which is not described herein first, and then detailed examples are given for the following.
Specifically, thetouch electrodes 13 are used to detect a touch position of a user, and eachtouch electrode 13 is electrically connected to thecontrol circuit 14 through a touch signal line. Fig. 1 only exemplarily shows that thetouch electrode 13 in the display device is a self-capacitance touch electrode 13, but the display device in the present application is not limited thereto, and in other embodiments, thetouch electrode 13 may also be a mutualcapacitance touch electrode 13, which is not limited herein and may be set by a person skilled in the art according to practical situations. If thetouch electrode 13 in thearray substrate 1 is self-contained, the working process is as follows: eachtouch electrode 13 corresponds to a certain coordinate position, and thetouch electrodes 13 respectively form capacitance with the ground. Thecontrol circuit 14 sends a square wave scanning signal to eachtouch electrode 13 through the touch signal line, and when a finger touches the display device, the capacitance of the finger is superimposed on thetouch electrode 13 touched by the finger, so that the capacitance to ground of thetouch electrode 13 touched by the finger changes. The change of the signal of eachtouch electrode 13 reflects the change of the capacitance of thetouch electrode 13 to the ground. By detecting the signal change condition of eachtouch electrode 13, it is determined whichtouch electrode 13 has a signal change, and further, the touch position of the finger can be determined according to the coordinate value corresponding to thetouch electrode 13 with the signal change. If thetouch electrodes 13 in thearray substrate 1 are mutually capacitive, the working process is as follows: the mutualcapacitance touch electrode 13 includes a horizontal electrode and a vertical electrode array, and a capacitor is formed at the crossing position of the two sets of electrodes. When a finger touches the display device, the coupling between the two electrodes near the touch point is affected, thereby changing the capacitance between the two electrodes. When the mutual capacitance is detected, thecontrol circuit 14 sequentially sends excitation signals to the transverse electrodes through the touch signal lines, and all the longitudinal electrodes receive signals at the same time, so that the capacitance value of the intersection point of all the transverse electrodes and the longitudinal electrodes, that is, the capacitance value of the two-dimensional plane of the whole touch panel can be obtained. According to the two-dimensional capacitance variation data of the touch panel, the coordinate value of each touch point can be calculated, and then the touch position of the finger can be determined.
It should be noted that, a person skilled in the art can set the positional relationship among the film layer where thepixel driving circuit 11 is located, the film layer where thefingerprint identification circuit 12 is located, and the film layer where thetouch electrode 13 is located according to the actual situation, which is not limited in this application. In addition, a film layer where a signal line electrically connecting thepixel driving circuit 11 and thecontrol circuit 14 is located, a film layer where a signal line electrically connecting thefingerprint identification circuit 12 and thecontrol circuit 14 is located, and a film layer where a signal line electrically connecting thetouch electrode 13 and thecontrol circuit 14 is located may be set by a person skilled in the art according to actual situations, which is not limited in this application.
It can be understood that, by separating the display stage DP, the fingerprint identification stage FPR, and the touch control stage TC in time sequence, in the display stage DP, there is no fingerprint identification driving signal on the signal line for transmitting the fingerprint identification driving signal to thefingerprint identification circuit 12, and there is no touch control driving signal on the signal line for transmitting the touch control driving signal to thetouch control electrode 13, so that thepixel driving circuit 11 is not interfered by the fingerprint identification driving signal and the touch control driving signal in the display stage DP, so as to ensure that thepixel driving circuit 11 works normally. Similarly, thefingerprint identification circuit 12 is not interfered by the display driving signal and the touch driving signal during the fingerprint identification stage FPR.
It is understood that, during the touch phase TC, the touch driving signal on the touch signal line is usually a square wave, and the signal line for transmitting the display driving signal to thepixel driving circuit 11 and the signal line for transmitting the fingerprint identification driving signal to thefingerprint identification circuit 12 are usually at a high level or a low level, so that parasitic capacitance is generated between these signal lines and the touch signal line, which affects touch detection. In the present application, in the touch control stage TC, a touch control driving signal exists on the signal line for transmitting the display driving signal to thepixel driving circuit 11, and meanwhile, a touch control driving signal exists on the signal line for transmitting the fingerprint identification driving signal to thefingerprint identification circuit 12, so that parasitic capacitance cannot be generated between the signal lines and the touch control signal line, and the problem of abnormal touch control detection caused by the parasitic capacitance is solved.
The display device provided by the embodiment of the invention comprises apixel driving circuit 11, afingerprint identification circuit 12 and atouch electrode 13 which are formed on anarray substrate 1, and further comprises acontrol circuit 14. The display stage DP, the fingerprint identification stage FPR and the touch control stage TC are separated in time sequence, so that the display, the fingerprint identification and the touch control are not interfered with each other, and in the touch control stage, a signal sent to the fingerprint identification circuit is driven fully along with a touch control signal, so that the signal on a touch control signal line can be prevented from being interfered by a parasitic capacitor, normal touch control detection is ensured, the problem that the display and the touch control are influenced after the fingerprint identification function is integrated on a display device is solved, and the performance of the display device is improved.
With reference to fig. 2, on the basis of the above technical solution, optionally, there is no time interval between the display stage DP, the fingerprint identification stage FPR, and the touch stage TC. It can be understood that, due to the existence of the leakage current, the display voltage stored in the storage capacitor (e.g., the first capacitor C1 and the second capacitor C2 in fig. 3) in thepixel driving circuit 11 is gradually decreased with time, so that the brightness of the corresponding sub-pixel is gradually decreased, and the above-mentioned setting mode can make the time interval between the end of the display phase DP and the arrival of the next display phase DP as short as possible, that is, the time for keeping the sub-pixel turned on by the display voltage stored in the storage capacitor is as short as possible, so that the brightness of each frame of display image is made to be dark as small as possible, and the display effect of the display device is ensured.
With continued reference to fig. 2, on the basis of the above technical solution, before the fingerprint unlocking is completed, each frame driving cycle of thecontrol circuit 14 includes a display stage DP, a touch stage TC, and a fingerprint identification stage FPR; after the fingerprint unlocking is completed, each frame driving period of thecontrol circuit 14 includes a display phase DP and a touch phase TC.
The advantage of setting up like this lies in, even display device can also respond user's touch operation before fingerprint unblock is accomplished, realizes touch-control and detects, is favorable to richening the function that display device can realize before fingerprint unblock is accomplished, for example, can awaken display device's the function of shooing through user's touch operation before fingerprint unblock is accomplished.
Fig. 4 is another driving timing diagram of the display device of fig. 1. Referring to fig. 4, on the basis of the above technical solution, optionally, before the fingerprint unlocking is completed, each frame driving period of thecontrol circuit 14 includes a display stage DP and a fingerprint identification stage FPR; after the fingerprint unlocking is completed, each frame driving period of thecontrol circuit 14 includes a display phase DP and a touch phase TC.
It can be understood that before the fingerprint identification stage FPR comes, the light sensor (e.g. the photodiode D1) in thefingerprint identification circuit 12 is usually in the integration stage, that is, the light sensor is in the stage of collecting the reflected light, and the absence of touch detection before the fingerprint unlocking is completed can prevent the touch driving signal from interfering with the normal operation of the light sensor, thereby preventing the fingerprint signal of the subsequent fingerprint identification stage FPR from being read abnormally.
Fig. 5 is still another driving timing diagram of the display device of fig. 1, and fig. 6 is still another driving timing diagram of the display device of fig. 1. Optionally, the display stage DP includes a plurality of sub-display stages DP; the touch stage TC is located between adjacent sub-display stages dp as shown in fig. 5 and 6, or after the last sub-display stage dp as shown in fig. 2 and 4.
Specifically, the number of the sub-display stages DP included in each display stage DP and the time length occupied by each sub-display stage DP can be set by those skilled in the art according to actual situations, and are not limited herein.
Specifically, although the specific implementation form of thepixel driving circuit 11 is various, and the signals sent by thecontrol circuit 14 are different for differentpixel driving circuits 11, in general, thecontrol circuit 14 sends scanning signals to thepixel driving circuit 11 through the Gate scanning lines Gate, and therefore, fig. 5 exemplarily shows the signals sent by thecontrol circuit 14 to thepixel driving circuit 11 through the Gate scanning lines at each stage. In the fingerprint identification stage FPR and the touch stage TC, signals on other signal lines between thecontrol circuit 14 and thepixel driving circuit 11 can be understood according to signals on the gate scan line, and are not described herein again. Similarly, in any form of thefingerprint identification circuit 12, normally, thecontrol circuit 14 sends a fingerprint identification scanning signal to thefingerprint identification circuit 12 through the fingerprint identification scanning line, and therefore, fig. 5 exemplarily shows signals sent by thecontrol circuit 14 to thepixel driving circuit 11 through the fingerprint identification scanning line in each stage. In the display stage DP and the touch stage TC, signals on other signal lines between thecontrol circuit 14 and thefingerprint identification circuit 12 can be understood according to signals on the fingerprint identification scan line, and are not described herein again.
It can be understood that, when the touch stage TC is located between adjacent sub-display stages dp, multiple times of touch detection are performed in each frame driving period, that is, the frequency of touch detection is relatively high, which is beneficial to improving the touch detection performance. When the touch control stage TC is located after the last sub-display stage DP, the time interval between the end of the current display stage DP and the arrival of the next display stage DP can be made as short as possible, that is, the time for keeping the sub-pixels turned on by the display voltage stored in the storage capacitor is kept as short as possible, so that the degree of dimming of the brightness of each frame of display image is made as small as possible, and the display effect of the display device is ensured.
Fig. 7 is a driving timing diagram of the display device of fig. 1. Referring to fig. 6 and 7, when the touch stage TC is not included in each frame of driving period before the fingerprint unlocking is completed, a time interval between two adjacent sub-display stages dp may be set, in other words, the original touch stage TC is left, and no touch detection is performed, as shown in fig. 6; it is also possible to set no time interval between two adjacent sub-display periods dp, as shown in fig. 7. Fig. 6 and 7 exemplarily show that the pulse width of the scan signal is the same before and after the fingerprint unlocking is completed, i.e. the time for charging the storage capacitor in thepixel driving circuit 11 is the same, but the present application is not limited to the display device, and the setting of the present application can be performed by a person skilled in the art according to practical situations.
On the basis of the above technical solution, optionally, the display device further includes a fingerprint identification scan line and a fingerprint identification data read line; thefingerprint identification circuit 12 includes a control switch; the control end of the control switch is electrically connected with the fingerprint identification scanning line; thecontrol circuit 14 provides a touch driving signal to thefingerprint identification circuit 12 through the fingerprint identification scan line in the touch phase TC.
The specific implementation of thefingerprint identification circuit 12 is various, but in general, thefingerprint identification circuit 12 includes a fingerprint identification scan line and a fingerprint identification data reading line, and thecontrol circuit 14 is electrically connected to the control terminal of the control switch in thefingerprint identification circuit 12 through the fingerprint identification scan line. Thecontrol circuit 14 sends a fingerprint identification scanning signal to thefingerprint identification circuit 12 through the fingerprint identification scanning line to turn on the control switch, when the light reflected by the touch subject is irradiated on the photodiode D1 in thefingerprint identification circuit 12, the light signal carrying the fingerprint information is converted into an electrical signal, and is transmitted to thecontrol circuit 14 through the control switch in the on state and the fingerprint identification data reading line.
It is understood that when other signal lines are included between thefingerprint identification circuit 12 and thecontrol circuit 14, thecontrol circuit 14 provides the touch driving signal to thefingerprint identification circuit 12 through at least one of the signal lines during the touch phase TC, and a person skilled in the art can set which signal line or lines has the touch driving signal during the touch phase TC according to practical situations, and the present disclosure is not limited herein.
Illustratively, fig. 8 is an equivalent circuit diagram of afingerprint identification circuit 12 provided by an embodiment of the present invention. Alternatively, referring to fig. 8, thefingerprint recognition circuit 12 includes a second thin film transistor T2, a third thin film transistor T3, a fourth thin film transistor T4, a third capacitor C3, and a photodiode D1. A control terminal of the second thin film transistor T2 is electrically connected to thecontrol circuit 14 through a Reset control signal line Reset, a first terminal of the second thin film transistor T2 is electrically connected to thecontrol circuit 14 through a Reset voltage signal line VDD, a second terminal of the second thin film transistor T2 is electrically connected to a cathode of the photodiode D1, an anode of the photodiode D1 is electrically connected to thecontrol circuit 14 through a common voltage signal line Vbias, and a third capacitor C3 is connected in parallel to the photodiode D1. A control terminal of the third tft T3 is electrically connected to a second terminal of the second tft T2, a first terminal of the third tft T3 is electrically connected to thecontrol circuit 14 through a reset voltage signal line VDD, a second terminal of the third tft T3 is electrically connected to a first terminal of the fourth tft T4, a control terminal of the fourth tft T4 is electrically connected to thecontrol circuit 14 through a fingerprint identification scan line Select, and a second terminal of the fourth tft T4 is electrically connected to thecontrol circuit 14 through a fingerprint identification data read line Vout. Correspondingly, the fingerprint identification stage FPR corresponding to thefingerprint identification circuit 12 sequentially includes a reset stage, a first reading stage and a second reading stage; the first and second reading phases are separated by a display phase DP, while thefingerprint recognition circuit 12 is in the integration phase between the first and second reading phases.
Illustratively, FIG. 9 is a timing diagram offingerprint identification circuit 12 of FIG. 8. In the touch phase TC, thecontrol circuit 14 provides a touch driving signal to thefingerprint identification circuit 12 through the fingerprint identification scan line. Referring to fig. 9, the operation of the fingerprint identification circuit 12 is: in the Reset phase T1, the high level provided by the Reset control signal line Reset controls the second thin film transistor T2 to be turned on, and the Reset voltage on the Reset voltage signal line VRST is transmitted to the Q node through the second thin film transistor T2, 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 second tft T2 is turned off, the photodiode D1 generates a leakage current due to light irradiation, the third capacitor C3 discharges, the potential of the Q node gradually decreases, the third tft T3 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 fourth tft T4 is controlled to be turned on, the reset voltage provided by the reset voltage signal line VDD flows to the fingerprint identification data line Vout through the third tft T3 and the fourth tft T4, the degree of turning on of the third tft T3 determines the potential of the fingerprint identification data line Vout, the degree of turning on of the third tft T3 is determined by the voltage of the Q node, that is the potential of the Q node determines the potential of the fingerprint identification data line Vout, the voltage value read on the fingerprint identification data line Vout read by the first reading phase T2 is V1, the voltage value on the reading line Vout of the fingerprint identification data read in the second reading stage t3 is V2, V1-V2 are determined by the magnitude of the leakage current of the photodiode D1, and the magnitude of the leakage current of the photodiode D1 is determined by the intensity of the light received by the photodiode D1, so that V2 is different under different light intensities, and during fingerprint detection, the light intensities reflected to the photodiode D1 are different in different fingerprint areas, so that the fingerprint identification can be realized by detecting the VI-V2 corresponding to the light sensing units at each position in the fingerprint identification area.
Based on the above inventive concept, the embodiment of the invention further provides a driving method of the display device. Fig. 10 is a flowchart of a driving method of a display device according to an embodiment of the present invention. Referring to fig. 10, the method includes:
and S110, providing a display driving signal to the pixel driving circuit in the display stage.
And S120, providing a fingerprint identification driving signal to a fingerprint identification circuit in a fingerprint identification stage.
S130, providing a touch driving signal to the touch electrode in the touch stage, and providing the touch driving signal to the fingerprint identification circuit and the pixel driving circuit.
The display stage, the fingerprint identification stage and the touch stage are not overlapped in time sequence.
It should be noted that there is no sequence between S120 and S130, and those skilled in the art can set the sequence according to actual situations.
On the basis of the above technical solution, with reference to fig. 2, optionally, there is no time interval between the display stage DP, the fingerprint identification stage FPR, and the touch stage TC.
On the basis of the above technical solution, with reference to fig. 2, optionally, before the fingerprint unlocking is completed, each frame of driving cycle includes a display stage DP, a touch stage TC, and a fingerprint identification stage FPR; after the fingerprint unlocking is completed, each frame of driving period comprises a display phase DP and a touch phase TC.
On the basis of the above technical solution, with reference to fig. 4, optionally, before the fingerprint unlocking is completed, each frame of driving cycle includes a display stage DP and a fingerprint identification stage FPR; after the fingerprint unlocking is completed, the frame driving period includes a display phase DP and a touch phase TC.
On the basis of the above technical solution, optionally, the display stage DP includes a plurality of sub-display stages DP; the touch stage TC is located between adjacent sub-display stages dp, as shown in fig. 5 or fig. 6, or after the last sub-display stage dp, as shown in fig. 2 or fig. 4.
On the basis of the above technical solution, optionally, the fingerprint identification stage FPR sequentially includes a reset stage, a first reading stage and a second reading stage; the first reading stage and the second reading stage are separated by a display stage, and meanwhile, the fingerprint identification circuit is in an integration stage between the first reading stage and the second reading stage.
The driving method of the display device according to the embodiment of the present invention is the same as the display device according to the embodiment of the present invention, and the technical details that are not described in detail in the embodiment of the present invention can be referred to the embodiment of the present invention, and the embodiment of the present invention has the same advantageous effects as the display device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles 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 changes, rearrangements 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 (11)
1. A display device, comprising:
the array substrate is provided with a pixel driving circuit, a fingerprint identification circuit and a touch electrode;
a control circuit that provides a display drive signal to the pixel drive circuit during a display phase; providing a fingerprint identification drive signal to the fingerprint identification circuit during a fingerprint identification phase; providing a touch driving signal to the touch electrode in a touch stage, and providing the touch driving signal to the fingerprint identification circuit and the pixel driving circuit;
the fingerprint identification stage sequentially comprises a reset stage, a first reading stage and a second reading stage; the first reading stage and the second reading stage are separated by one display stage, and meanwhile, the fingerprint identification circuit is in an integration stage between the first reading stage and the second reading stage;
wherein the reset stage, the first reading stage, the second reading stage, the touch stage and the display stage are not overlapped in time sequence; in the display stage, the control circuit provides scanning signals to the pixel driving circuit through a grid scanning line, and provides display voltages to the pixel driving circuit through a data signal line.
2. The display device according to claim 1, wherein the display stage, the fingerprint recognition stage, and the touch stage have no time interval therebetween.
3. The display device according to claim 1, wherein before the fingerprint unlocking is completed, a driving cycle of the control circuit per frame includes the display phase, the touch phase and the fingerprint identification phase; after the fingerprint unlocking is completed, each frame of driving period of the control circuit comprises the display phase and the touch phase.
4. The display device according to claim 1, wherein before completion of fingerprint unlocking, a driving period of the control circuit per frame includes the display phase and the fingerprint identification phase; after the fingerprint unlocking is completed, each frame of driving period of the control circuit comprises the display phase and the touch phase.
5. A display device as claimed in claim 3 or 4, characterised in that the display phase comprises a plurality of sub-display phases; the touch control stage is positioned between the adjacent sub-display stages or positioned after the last sub-display stage.
6. The display device according to claim 1, further comprising a fingerprint identification scan line and a fingerprint identification data read line; the fingerprint identification circuit comprises a control switch; the control end of the control switch is electrically connected with the fingerprint identification scanning line;
the control circuit provides the touch driving signal to the fingerprint identification circuit through the fingerprint identification scanning line in a touch control stage.
7. A method of driving a display device, comprising:
providing a display drive signal to the pixel drive circuit during a display phase;
providing a fingerprint identification driving signal to a fingerprint identification circuit in a fingerprint identification stage;
providing a touch driving signal to a touch electrode in a touch stage, and providing the touch driving signal to the fingerprint identification circuit and the pixel driving circuit;
the fingerprint identification stage sequentially comprises a reset stage, a first reading stage and a second reading stage; the first reading stage and the second reading stage are separated by one display stage, and meanwhile, the fingerprint identification circuit is in an integration stage between the first reading stage and the second reading stage;
wherein the reset stage, the first reading stage, the second reading stage, the touch stage and the display stage are not overlapped in time sequence; in the display stage, a scanning signal is provided to the pixel driving circuit through a gate scanning line, and a display voltage is provided to the pixel driving circuit through a data signal line.
8. The method of claim 7, wherein the display stage, the fingerprint recognition stage, and the touch stage are separated by no time interval.
9. The method of claim 7, wherein before the fingerprint unlocking is completed, each frame driving period comprises the display phase, the touch phase and the fingerprint identification phase; after the fingerprint unlocking is completed, each frame of driving period comprises the display phase and the touch phase.
10. The method of claim 7, wherein before the fingerprint unlocking is completed, each frame driving period comprises the display phase and the fingerprint identification phase; after the fingerprint unlocking is completed, the frame driving period comprises the display phase and the touch phase.
11. The method of claim 9 or 10, wherein the display phase comprises a plurality of sub-display phases; the touch control stage is positioned between the adjacent sub-display stages or positioned after the last sub-display stage.
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| CN112181202B (en)* | 2020-09-28 | 2023-11-07 | 厦门天马微电子有限公司 | Display device and driving method thereof |
| CN112051941B (en)* | 2020-09-28 | 2023-12-12 | 京东方科技集团股份有限公司 | Method, circuit and device for synchronizing touch signals during on-screen fingerprint identification |
| CN112462973B (en)* | 2020-11-30 | 2023-12-05 | 厦门天马微电子有限公司 | Driving method and driving circuit of touch display panel and touch display device |
| CN113485573B (en)* | 2021-06-29 | 2024-06-04 | 厦门天马微电子有限公司 | Display panel, touch positioning method thereof and display device |
| CN113903061B (en)* | 2021-10-08 | 2024-05-24 | 上海天马微电子有限公司 | Fingerprint identification method of display panel, display panel and display device |
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