CN106598334B - Touch display device and driving method thereof - Google Patents
Touch display device and driving method thereof Download PDFInfo
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- CN106598334B CN106598334B CN201611161213.8A CN201611161213A CN106598334B CN 106598334 B CN106598334 B CN 106598334B CN 201611161213 A CN201611161213 A CN 201611161213A CN 106598334 B CN106598334 B CN 106598334B
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- G06—COMPUTING; CALCULATING OR 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The application discloses a touch display device and a driving method thereof, wherein the driving method comprises the following steps: in the display period, a common voltage signal is applied to each first touch electrode, and a display signal is applied to each data line; applying a touch scanning signal to each first touch electrode during touch detection; wherein at least a part of the touch detection period is provided in a display pause period including a field blanking period between adjacent frame periods and a line blanking period in an adjacent two scanning line conduction interval. According to the scheme of the embodiment of the application, at least one part of the touch detection period is set in the display intermission period, so that the time that the touch detection needs to occupy normal display is shortened, the number of H-lines is reduced, and the display effect is improved.
Description
Technical Field
The present disclosure relates generally to the field of display technologies, and in particular, to a touch display device and a driving method thereof.
Background
The touch display device can detect the coordinate position of the finger on the touch display device through the touch electrode, and carry out corresponding operation instructions according to the coordinate position.
In the current touch display device, the touch function is usually implemented by two touch electrode layers, wherein each touch electrode layer has a plurality of touch electrodes arranged in parallel, and the extending directions of the touch electrodes in the two touch electrode layers are intersected. And applying a touch scanning signal to each touch electrode on one touch electrode layer, wherein when a finger of a person touches a screen of the touch display device, the finger and some touch electrodes on the screen form a coupling capacitor, and leakage current flows out of the coupling capacitor. The touch detection circuit determines two crossed touch electrodes which form coupling capacitance with fingers on the two layers of touch electrodes by detecting leakage current, so that the touch position is determined.
In a liquid crystal display device having a touch function, a common electrode is generally multiplexed as a touch drive electrode. And in a time period of one frame, a common voltage signal and a touch scanning signal are supplied to the common electrode in a time-sharing manner, so that the functions of display and touch detection are realized in the time period of one frame respectively.
In the prior art, a touch detection time interval is usually inserted after display signals are provided for a plurality of rows of pixels, and because a common electrode is reused as a touch driving electrode in the touch detection time interval, the display effect is influenced to a certain extent, so that bright stripes (H-lines) appear at corresponding positions of a display screen. Since the number of the bright stripes is equal to the number of the touch detection periods in one frame period, and the touch detection periods are usually included in one frame period, a plurality of bright stripes appear when one frame of picture is displayed, resulting in poor display effect.
On the other hand, as the resolution is increased, the number of rows of pixels is also increased, and the display time allocated to each row of pixels is significantly reduced at a certain frame rate. And the time required for the touch detection period is relatively fixed. As a result, the proportion of the touch detection period is significantly increased, resulting in a more severe H-line.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a touch display device and a driving method thereof, so as to solve the technical problems in the prior art.
In a first aspect, an embodiment of the present application provides a driving method of a touch display device, where the touch display device includes a plurality of scan lines, a plurality of data lines intersecting the plurality of scan lines in an insulated manner, a display pixel array formed by intersecting the scan lines and the data lines, and a first touch electrode array, where the display pixel array includes a plurality of display pixels arranged in an array; the first touch electrode array comprises M first touch electrodes, wherein M is a positive integer; the driving method is characterized by comprising the following steps: in the display period, a common voltage signal is applied to each first touch electrode, and a display signal is applied to each data line; applying a touch scanning signal to each first touch electrode during touch detection; wherein at least a part of the touch detection period is provided in a display pause period including a field blanking period between adjacent frame periods and a line blanking period in an adjacent two scanning line conduction interval.
In some embodiments, the driving method further comprises: detecting a touch frequency of a touch display device; if the touch frequency is lower than the first preset touch frequency, applying a common voltage signal to each first touch electrode and applying a display signal to each data line during the display period comprises: applying a display signal to each data line in each frame period; during touch detection, applying a touch scan signal to each first touch electrode includes: and applying touch scanning signals to the first touch electrodes simultaneously in a vertical blanking stage, wherein the frame period has a first preset frame frequency.
In some embodiments, if the touch frequency is not lower than the first preset touch frequency, applying a touch scan signal to each first touch electrode during the touch detection further includes: applying a touch scanning signal to at least one first touch electrode in the first touch electrode array during each touch detection sub-period; the touch detection period comprises K touch detection sub-periods, at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, K is a positive integer and is less than or equal to M.
In some embodiments, if the touch frequency is not lower than the first predetermined touch frequency, at least a portion of the at least one touch detection sub-period is set in the line blank period.
In some embodiments, if the touch frequency is higher than the second predetermined touch frequency, the method further includes: improving the frame frequency of the frame period to a second preset frame frequency; and the second preset touch frequency is greater than the first preset touch frequency.
In some embodiments, each first touch electrode in the first touch electrode array is arranged in a matrix; the driving method further includes: and receiving touch induction signals collected by each first touch electrode during the touch detection period.
In some embodiments, the first touch electrode is a stripe electrode extending along a first direction, the touch display device further includes a second touch electrode array including a plurality of stripe second touch electrodes extending along a second direction, the first direction intersects the second direction; the driving method further includes: and receiving the touch induction signals collected by the second touch control electrodes during the touch detection period.
In a second aspect, the present application further provides a touch display device, including: a plurality of scan lines; a plurality of data lines intersecting the plurality of scanning lines in an insulated manner; the display pixel array is formed by intersecting each scanning line and each data line and comprises a plurality of display pixels arranged in an array; the touch electrode array comprises M touch electrodes, wherein M is a positive integer; the integrated circuit is used for applying a common voltage signal to each touch electrode in a display period, applying a display signal to each data line and applying a touch scanning signal to each touch electrode in a touch detection period; wherein at least a part of the touch detection period is provided in a display pause period including a field blanking period between adjacent frame periods and a line blanking period in an adjacent two scanning line conduction interval.
In some embodiments, when the touch frequency is lower than the first predetermined touch frequency, the integrated circuit is configured to simultaneously apply the touch scan signal to the touch electrodes in the vertical blanking period and apply the common voltage signal to the touch electrodes in each frame period, where the frame period has the first predetermined frame frequency.
In some embodiments, when the touch frequency is higher than the first preset touch frequency, the touch detection period includes K touch detection sub-periods, where K is a positive integer;
the integrated circuit is used for applying a touch scanning signal to at least one touch electrode in the touch electrode array during each touch detection sub-period;
at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, and K is less than or equal to M.
In some embodiments, at least a portion of the at least one touch detection sub-period is set to the line blanking period when the touch frequency is not lower than the first preset touch frequency.
In some embodiments, when the touch frequency is higher than the second preset touch frequency, the integrated circuit is configured to apply a display signal to each data line and provide a touch scanning signal to at least a portion of the touch electrodes in each frame period; the frame period has a second preset frame frequency, the first preset touch frequency is smaller than the second preset touch frequency, and the first preset frame frequency is smaller than the second preset frame frequency.
In some embodiments, the touch display device further includes a multiplexer and a plurality of data signal transmission lines; one end of each data signal transmission line is electrically connected with the integrated circuit, and the other end of each data signal transmission line is electrically connected with one input end of the multiplexer and used for providing data signals to at least two data lines in a time-sharing mode through the multiplexer.
In some embodiments, the multiplexer includes a plurality of multiplexing units, each multiplexing unit including m first transistors and a first clock signal line group; the first clock signal line group comprises m first clock signal lines; the first poles of the m first transistors of the same multiplexing unit are electrically connected with the same data signal transmission line, the grid electrodes of the m first transistors of the same multiplexing unit are respectively and correspondingly electrically connected with one first clock signal line, and the second poles of the m first transistors of the same multiplexing unit are electrically connected with one data line; m is a positive integer.
In some embodiments, m is 6.
According to the scheme of the embodiment of the application, at least one part of the touch detection period is arranged in the display intermission period, so that the time that the touch detection needs to occupy normal display is shortened, the number of H-lines is reduced, and the display effect is improved.
In some embodiments of the present application, when the touch frequency is low, the touch detection period may be set to the field blanking period between adjacent frames in its entirety, so that the progressive display is not interrupted by the touch detection, thereby avoiding the generation of H-lines.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a touch display device to which a driving method of the touch display device of the present application is applied;
FIG. 2 shows a schematic flow chart diagram of a driving method of an embodiment of the present application;
FIG. 3 shows a schematic flow chart of a driving method of another embodiment of the present application;
fig. 4A illustrates a driving timing sequence when the touch display device to which the driving method of the embodiments of the present application is applied is of a mutual capacitance type structure and the touch frequency is lower than a first preset frequency;
fig. 4B shows a driving timing sequence when the touch display device to which the driving method of the embodiments of the present application is applied is of a mutual capacitance type and the touch frequency is not lower than the first preset frequency;
fig. 5A illustrates a driving timing sequence when the touch display device to which the driving method of the embodiments of the present application is applied is a self-contained structure and the touch frequency is lower than a first preset frequency;
fig. 5B shows a driving timing sequence when the touch display device applying the driving method of the embodiments of the present application is a self-contained structure and the touch frequency is not lower than the first preset frequency;
FIG. 6 is a schematic block diagram illustrating one embodiment of a touch display device of the present application;
FIG. 7 is a schematic block diagram illustrating another alternative implementation of the touch display device of the embodiment of FIG. 6;
FIG. 8 shows a schematic circuit diagram of a multiplexer;
fig. 9 shows a timing diagram of signals in one frame period in the multiplexer shown in fig. 8.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of a touch display device to which the driving method of the touch display device of the present application is applied.
Specifically, the touch display device applying the driving method of the present application includes a plurality of scan lines 110, a plurality of data lines 120 intersecting the plurality of scan lines 110 in an insulated manner, a display pixel array formed by intersecting each scan line 110 and the data line 120, and a first touch electrode array. The display pixel array includes a plurality of display pixels 130 arranged in an array. The first touch electrode array includes M first touch electrodes 140, where M is a positive integer. Here, the first touch electrode 140 may serve as a touch driving electrode. That is, when performing touch detection, touch scan signals are applied to the touch driving electrodes, and a touch position is determined by the received touch sensing signals.
In addition, although each of the first touch electrodes 140 in fig. 1 is a stripe electrode having an extending direction parallel to the data line, the shape and the extending direction thereof are only schematic and are not conditions that the first touch electrodes have to satisfy. Those skilled in the art can change the shape and the extending direction of the first touch electrode according to the needs of the practical application scenario.
Referring to fig. 2, a schematic flow chart diagram of an embodiment of the driving method of the present application is shown. Next, the driving method of the present embodiment will be described in detail with reference to fig. 1 and 2.
The driving method of the present embodiment includes:
in step 210, during the display period, a common voltage signal is applied to each first touch electrode 140, and a display signal is applied to each data line 120. That is, during display, the first touch electrode 140 is reused as a common electrode. In this way, liquid crystal molecules (not shown in the figure) in the touch display device can be deflected by an electric field formed between the common electrode and the pixel electrode (not shown in the figure), so as to realize display of a predetermined picture.
In step 220, during the touch detection period, a touch scan signal is applied to each first touch electrode 140. Wherein at least a part of the touch detection period is provided in a display pause period including a field blanking period between adjacent frame periods and a line blanking period in an adjacent two scanning line conduction interval. As described above, since the first touch electrode 140 may be a touch driving electrode, it may receive a touch scan signal during touch detection and determine a touch position through a touch sensing signal sensed by the touch sensing electrode.
When the touch display device is in a display period, the display signals on the data lines are provided to the pixel electrodes corresponding to the display pixels, and meanwhile, the common electrode receives a common voltage signal. In this way, the liquid crystal molecules can be deflected by an electric field formed between the pixel electrode and the common electrode, thereby realizing display of a predetermined picture. In addition, the common voltage signal is a signal having a fixed voltage in a normal case. As can be seen from the above analysis, the common voltage applied to the common electrode plays a crucial role in displaying a predetermined picture.
However, during the touch detection, the common electrodes are multiplexed as touch driving electrodes, that is, during each touch detection, not the common voltage signal but the touch scan signal is applied to at least one common electrode. In general, the touch scan signal is a continuous pulse signal. Thus, in the touch detection period, since the signal level on the common electrode multiplexed as the touch driving electrode is not fixed, if the data lines provide display signals to the pixel electrodes (that is, there is a corresponding voltage on the pixel electrodes), the electric field intensity of the electric field formed between the pixel electrodes and the common electrodes multiplexed as the touch driving electrodes changes with the switching of the high and low levels of the pulse signals, and the deflection angle of the liquid crystal molecules changes accordingly, so that the display screen in the area corresponding to the position of the common electrodes on the touch display panel is interfered, and H-line is generated.
On the other hand, in the display pause period, each data line is in a charging or discharging state, and the voltage corresponding to the data signal on the data line is not reached yet. At this time, the data line does not provide any data signal, and the picture observed by the user is the picture at the last data writing time due to the persistence phenomenon.
Specifically, in the vertical blanking period, each data line is initialized to supply a voltage corresponding to the next frame data signal to each pixel region, and at this time, no data signal is supplied to the data line. Due to the persistence of vision, the picture observed by the user is the display picture of the previous frame.
In the line blanking period, for example, assuming that the display device includes M lines of display pixels, in any ith line blanking period, the first i lines of display pixels have completed writing and displaying of the current frame data signal, and the i +1 th to mth lines of display pixels have not completed writing and displaying of the current frame data signal. At this time, the voltage on the data line is switched from the voltage corresponding to the data signal of each display pixel in the ith row to the voltage corresponding to the data signal of each display pixel in the (i + 1) th row, and at this time, no data signal is supplied to the data line. Due to the persistence of vision, the display pixels in the 1 st to ith rows of the picture observed by the user are the pictures corresponding to the current frame, and the display pixels in the (i + 1) th to mth rows are the pictures corresponding to the previous frame.
As can be seen from the above description, in the display pause period, the data line is in a state of being ready for the data signal, and the writing of the data signal has not been completed yet. Therefore, the touch detection is performed with the display pause period so that the touch detection set in the display pause period does not exert any adverse effect on the screen display.
Referring to fig. 3, a schematic flow chart diagram of another embodiment of the driving method of the present application is shown. The driving method of the present embodiment includes:
step 310 detects a touch frequency of the touch display device.
Here, the touch frequency may be the number of times the touch display device is touched (e.g., by a finger, a passive pen, etc.) per unit time. In addition, the "unit time" may be set according to the requirements of the actual application scenario, for example, the "unit time" may be set to 10 seconds, 1 minute, 10 minutes, and so on.
In step 320, it is determined whether the touch frequency is lower than a first preset frequency.
Here, the "first preset frequency" may be set according to the requirements of an actual application scenario. By judging the magnitude relation between the touch frequency and the first preset frequency, the touch display device can be driven in different modes in the subsequent steps according to the magnitude of the touch frequency.
If the determination result in step 320 is "yes", that is, the touch frequency is lower than the first predetermined touch frequency, in step 330, a display signal is applied to each data line in each frame period, and a touch scan signal is applied to each first touch electrode in the field blanking period at the same time, where the frame period has the first predetermined frame frequency.
That is, if the touch frequency is lower than the first predetermined touch frequency, the whole time in the frame period is used for displaying, and during this time, the voltage applied to the first touch electrode is the common voltage. On the other hand, because the touch frequency is low (lower than the first preset touch frequency), in the field blanking period between adjacent frames, the touch scanning signal can be simultaneously applied to each first touch electrode, so as to detect whether there is a touch.
In some application scenarios, assuming that the first preset touch frequency is 0, the entire time in the frame period is used as the display, and only the field blanking period is used to detect whether there is a touch currently. Thus, the phenomenon of poor display such as H-line caused by inserting the touch detection time period in the display process of progressive scanning can be avoided. On the other hand, the detection of whether the touch is present is only performed in the vertical blanking stage, so that the time required for touch detection can be reduced, and since the touch scanning signal for detecting the touch is usually a square wave signal, the time for outputting the square wave signal is reduced, and the output power consumption of the touch display panel can be correspondingly reduced.
In addition, it should be noted that the first preset frame rate can be set according to the requirements of the actual application scenario. The frame rate can be understood as the number of frames displayed on the touch display device in a unit time, and accordingly, the higher the frame rate is, the better the consistency of the display screen is.
As further shown in fig. 3, in some alternative implementations, the driving method of the present embodiment may further include the following steps:
if the determination result in the step 320 is "no", that is, the touch frequency is not lower than the first preset touch frequency, in a step 350, a touch scan signal is applied to at least one first touch electrode in the first touch electrode array during each touch detector period. The touch detection period may include K touch detection sub-periods from the start time of one frame to the start time of the next frame, where K is a positive integer, and at least one touch detection sub-period is set in a field blanking period between adjacent frame periods, and K is equal to or less than M.
When the touch frequency is not lower than the first preset touch frequency, it may be considered that the touch of the external world on the touch display device is relatively frequent, and at this time, it is necessary to determine whether a touch behavior occurs in the touch display device at present, and further detect the position of the touch point, so that the display device executes a corresponding operation based on the detected position of the touch point and displays a corresponding screen. Therefore, when the touch is frequent (for example, when the touch frequency is not lower than the first preset touch frequency), accurate detection of the touch point is also very important. In this case, the K touch detection sub-periods are inserted from the start of the display of the current frame picture to the display of the next frame picture, so that the touch detection report times can be increased, and the sensitivity and accuracy of touch detection can be improved. In addition, at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, and the number of touch detection sub-periods arranged in the frame periods is correspondingly reduced, so that the number of times of interruption of the progressive scanning display is reduced, the number of H-lines is reduced, and the display effect is improved.
Further, when the touch frequency is not lower than the first preset touch frequency, at least a portion of at least one touch detection sub-period may also be set in a line blanking (Hblank) phase. In each line blanking period in the frame period, each data line is in a charge-discharge state, the writing of a display signal of a new line is not performed, and the touch detection in the line blanking period does not have any adverse effect on the display. Therefore, by fully utilizing the line blanking period in the frame period, the H-line phenomenon caused by each touch detection sub-period in the frame period can be partially reduced, thereby weakening the adverse effect of the touch detection in the frame period on the display effect.
In some optional implementations, the driving method of this embodiment may further include the following steps:
and step 360, judging whether the touch frequency is higher than a preset second touch frequency. Here, the second preset touch frequency is greater than the first preset touch frequency.
In step 370, if the touch frequency is higher than the second predetermined touch frequency, the frame frequency of the frame period is increased to a second predetermined frame frequency.
When the touch frequency is higher than the second preset touch frequency, it may be considered that external touch on the touch display device is very frequent, and accordingly, in order to achieve accurate and rapid detection of the touch position, the number of touch detection times per unit time should be increased accordingly. However, if the number of touch detections is increased by inserting more touch detection sub-periods within one frame period, more H-lines must be generated, so that the display effect is deteriorated. In order to avoid the deterioration of the display effect when the touch detection is frequent, the increase of the number of touch detections per unit time can be realized by raising the frame rate.
Specifically, assuming that the frame frequency is a and K touch detection sub-periods are inserted from the start of the display of the current frame picture to the display of the next frame picture, the AK touch detection sub-periods are used for the detection of the touch position in the unit time. The frame frequency A is improved, so that the number AK of touch detection sub-periods in unit time is correspondingly increased, the number of touch point reporting times in unit time is increased, and the sensitivity and the accuracy of touch detection are improved. On the other hand, since the number of touch detection sub-periods inserted in one frame period is not increased, the number of H-lines is not increased, and the display effect is not deteriorated.
As can be seen from the above description, when the touch is very frequent, the frame frequency is directly increased, so that the increase of the number of reporting points in the unit time can be realized while the increase of the number of H-lines is avoided, thereby ensuring the good display effect of the touch display device.
In some optional implementations, in the touch display device to which the driving method of the embodiments of the present application is applied, the first touch electrode array may have an architecture as shown in fig. 1. That is, the first touch electrode 140 is a strip electrode and extends along the first direction. Here, the first direction in which the first touch electrode 140 extends may be set according to the needs of an actual application scenario, for example, the first direction may be set as an extending direction of a data line or a scan line in the touch display device.
In these optional implementation manners, in order to achieve the detection accuracy of the touch position, the touch display device may further include a second touch electrode array, where the second touch electrode array includes a plurality of strip-shaped second touch electrodes extending along a second direction, and the first direction intersects the second direction.
In this way, the two layers of touch electrodes may form a mutual capacitance type touch detection architecture, that is, the detection of the touch position is realized by applying a touch scanning signal to one layer of touch electrode and receiving a touch sensing signal collected by the other layer of touch electrode.
Under the mutual capacitance type touch detection architecture, the driving method of the embodiments of the present application may further include:
and receiving the touch induction signals collected by the second touch control electrodes during the touch detection period.
Next, with reference to fig. 4A and 4B, a driving process of the driving method according to the embodiments of the present application under the mutual capacitance touch detection architecture will be further described, so that the technical effect thereof is more clearly embodied.
Specifically, referring to fig. 4A, the driving timing when the touch frequency is lower than the first preset frequency is shown.
When the touch frequency is lower than the first preset frequency, the detection of whether there is a touch is performed only in a field blanking (Vblank) period between two FRAMEs (e.g., between FRAME1 and FRAME 2). At this time, pass throughTo the first touch electrodes TX 1-TX simultaneouslyMApplying a touch scan signal and receiving each of the second touch electrodes RX 1-RXNAnd judging whether the touch display device is touched or not by the acquired touch induction signals.
Therefore, in the frame, the display period cannot be interrupted by touch detection, the generation of H-line is avoided, and the display effect is greatly improved. On the other hand, the touch detection is only carried out in the Vblank stage, and the power consumption of the touch display device can be remarkably reduced.
Referring to fig. 4B, the driving timing when the touch frequency is not lower than the first preset frequency is shown.
Assuming that K is M, M touch detection sub-periods T1 to T are total from the beginning of the current frame to the beginning of the next frameM. During each touch detection sub-period, one can go to TX 1-TXMOne of the first touch electrodes provides a touch scan signal, provides a common voltage (Vcom) signal to the other first touch electrodes, and receives the second touch electrodes R1-RNThe collected touch sensing signals. In addition, in each display sub-period D1-DMThe Vcom signal is provided to each of the first touch electrodes so that the first touch electrodes are reused as a common electrode.
Further, at least one touch detection sub-period is set in the Vblank phase between two frames when the touch frequency is not lower than the first preset frequency, for example, one touch detection sub-period (T) is schematically shown in fig. 4BM) In the Vblank phase. Thus, in the frame, the number of touch detection sub-periods inserted into the adjacent display sub-periods is correspondingly reduced, so that the number of H-lines is reduced, and the display effect is improved.
In some optional implementations, in the touch display device to which the driving method of each embodiment of the present application is applied, each first touch electrode in the first touch electrode array may be arranged in a matrix, and each first touch electrode is a block electrode. In these alternative implementations, each first touch electrode in the first touch electrode array may form a self-capacitance touch detection architecture. That is, the detection of the touch position is realized by applying touch scanning signals to the first touch electrodes and receiving touch sensing signals collected by the first touch electrodes.
Under the self-capacitance touch detection architecture, the driving method of the embodiments of the present application may further include:
and receiving touch induction signals collected by each first touch electrode during the touch detection period.
Next, with reference to fig. 5A and 5B, a driving process of the driving method according to the embodiments of the present application under the self-capacitance touch detection architecture will be further described, so that the technical effect thereof is more clearly embodied.
Specifically, as shown in fig. 5A, the driving timing when the touch frequency is lower than the first preset frequency is shown.
When the touch frequency is lower than the first preset frequency, the detection of whether there is a touch is performed only in a field blanking (Vblank) period between two FRAMEs (e.g., between FRAME1 and FRAME 2). At this time, the first touch electrodes TX 1-TX are simultaneously touchedMApplying a touch scanning signal and receiving each of the first touch electrodes TX1 TXMAnd judging whether the touch display device is touched or not by the acquired touch induction signals.
Therefore, in the frame, the display period cannot be interrupted by touch detection, the generation of H-line is avoided, and the display effect is greatly improved. On the other hand, the touch detection is only carried out in the Vblank stage, and the power consumption of the touch display device can be remarkably reduced.
Referring to fig. 5B, the driving timing when the touch frequency is not lower than the first preset frequency is shown.
When the touch frequency is not lower than the first preset frequency, K touch detection sub-periods T1-T are totally arranged from the beginning of the current frame to the beginning of the next frameK. During each touch detection sub-period, one can go to TX 1-TXMEach of the first touch electrodes provides a touch scanning signal and receives the first touch electrodes TX 1-TXMThe collected touch sensing signals. In addition, in each display sub-period D1-DKThe Vcom signal is provided to each of the first touch electrodes so that the first touch electrodes are reused as a common electrode.
Further, at least one touch detection sub-period is set in the Vblank phase between two frames when the touch frequency is not lower than the first preset frequency, for example, one touch detection sub-period (T) is schematically shown in fig. 5BK) In the Vblank phase. Thus, in the frame, the number of touch detection sub-periods inserted into the adjacent display sub-periods is correspondingly reduced, so that the number of H-lines is reduced, and the display effect is improved.
The application also discloses a touch display device. Fig. 6 is a schematic structural diagram of an embodiment of a touch display device according to the present application.
The touch display device of the present embodiment includes a plurality of scan lines 610, a plurality of data lines 620 intersecting with the plurality of scan lines 610 in an insulated manner, a display pixel array formed by intersecting each scan line and data line, a touch electrode array, and an integrated circuit 650.
The display pixel array includes a plurality of display pixels 630 arranged in an array. The touch electrode array includes M touch electrodes 640, where M is a positive integer.
The integrated circuit 650 is used to apply a common voltage signal to each touch electrode 640 during display, a display signal to each data line 620, and a touch scan signal to each touch electrode 640 during touch detection.
Wherein at least a part of the touch detection period is provided in a display pause period including a field blanking period between adjacent frame periods and a line blanking period in an adjacent two scanning line conduction interval.
Since the data line 620 is in a state of preparing a data signal in the display pause period, writing of the data signal has not been completed. Therefore, the touch detection is performed by using the display pause period, and any adverse effect of the touch detection on the effect display can be avoided.
In some optional implementations, when the touch frequency is lower than the first preset touch frequency, the integrated circuit may be further configured to simultaneously apply a touch scan signal to each touch electrode in a field blanking period and apply a common voltage signal to each touch electrode in each frame period, where the frame period has a first preset frame frequency.
In these alternative implementations, if the touch frequency is lower than the first preset touch frequency, all the time in the frame period is used for displaying, and during this time, the voltage applied to the first touch electrode is the common voltage. On the other hand, because the touch frequency is low (lower than the first preset touch frequency), in the field blanking period between adjacent frames, the touch scanning signal can be simultaneously applied to each first touch electrode, so as to detect whether there is a touch.
In some optional implementations, when the touch frequency is higher than the first preset touch frequency, in a time period from a starting time of a current frame to a starting time of a next frame, the touch detection period may further include K touch detection sub-periods, where K is a positive integer and K is less than or equal to M.
In these alternative implementations, the integrated circuit may be further configured to apply a touch scan signal to at least one touch electrode in the array of touch electrodes during each touch detect sub-period. And at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, and K is less than or equal to M.
When the touch frequency is not lower than the first preset touch frequency, it may be considered that the touch of the external world on the touch display device is relatively frequent, and at this time, it is necessary to determine whether a touch behavior occurs in the touch display device at present, and further detect the position of the touch point, so that the display device executes a corresponding operation based on the detected position of the touch point and displays a corresponding screen. Therefore, when the touch is frequent (for example, when the touch frequency is not lower than the first preset touch frequency), accurate detection of the touch point is also very important. In this case, the K touch detection sub-periods are inserted from the start of the display of the current frame picture to the display of the next frame picture, so that the touch detection report times can be increased, and the sensitivity and accuracy of touch detection can be improved. In addition, at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, and the number of touch detection sub-periods arranged in the frame periods is correspondingly reduced, so that the number of times of interruption of the progressive scanning display is reduced, the number of H-lines is reduced, and the display effect is improved.
When the touch frequency is not lower than the first preset touch frequency, at least one part of at least one touch detection sub-period is arranged in the line blanking period. In this way, since each data line is in a charge-discharge state in each line blanking period in the frame period, writing of a display signal for a new line is not performed, and the touch detection in the line blanking period does not have any adverse effect on the display. Therefore, by fully utilizing the line blanking period in the frame period, the H-line phenomenon caused by each touch detection sub-period in the frame period can be partially reduced, thereby weakening the adverse effect of the touch detection in the frame period on the display effect.
In some alternative implementations, when the touch frequency is higher than the second predetermined touch frequency, the integrated circuit 650 may be further configured to apply a display signal to each data line 620 and provide a touch scan signal to at least a portion of the touch electrodes 640 in each frame period. The frame period has a second preset frame frequency, the first preset touch frequency is smaller than the second preset touch frequency, and the first preset frame frequency is smaller than the second preset frame frequency.
When the touch frequency is higher than the second preset touch frequency, it may be considered that external touch on the touch display device is very frequent, and accordingly, in order to achieve accurate and rapid detection of the touch position, the number of touch detection times per unit time should be increased accordingly. However, if the number of touch detections is increased by inserting more touch detection sub-periods within one frame period, more H-lines must be generated, so that the display effect is deteriorated. In order to avoid the deterioration of the display effect when the touch detection is frequent, the increase of the number of touch detections per unit time can be realized by raising the frame rate.
In some optional implementations of the present embodiment, as shown in fig. 6, the first touch electrode 640 is a strip electrode. In order to realize accurate detection of the touch position, a plurality of second touch electrodes (not shown in the figure) intersecting with the extending direction of the first touch electrode 640 may be further provided, so that detection of the touch position is realized by a detection architecture of mutual capacitance.
Alternatively, in another optional implementation manner of this embodiment, as shown in fig. 7, the first touch electrodes 740 may also be block-shaped electrodes, so that the first touch electrodes 740 forming the first touch electrode array are arranged in a matrix, and the detection of the touch position is realized by using a self-capacitance detection framework.
In addition, in some alternative implementations of the touch display device of the present application, as shown in fig. 6 and 7, the respective data signal output ports of the integrated circuits 650 and 750 may be electrically connected to the respective data lines 620 and 720 in a one-to-one correspondence.
Alternatively, in other alternative implementations of the touch display device of the present application, each data signal output port of the integrated circuit and each data line may be electrically connected through a data signal transmission line and a multiplexer.
In particular, in these alternative implementations, one end of each data signal transmission line is electrically connected to the integrated circuit, and the other end of each data transmission line is electrically connected to one of the input terminals of the multiplexer, for providing the data signals to at least two data lines in a time-sharing manner through the multiplexer.
Referring to fig. 8, a schematic block diagram of a multiplexer in these alternative implementations is shown.
As shown in fig. 8, the multiplexer includes M (e.g., 6) transistors M1, M2, M3, M4, M5, M6. The gates of the transistors M1, M2, M3, M4, M5, and M6 are electrically connected to M (6) control terminals CT1, CT2, CT3, CT4, CT5, and CT6 of the multiplexer In a one-to-one correspondence, the first poles of the transistors M1, M2, M3, M4, M5, and M6 are electrically connected to M (6) first input terminals In1, In2, In3, In4, In5, and In6 In a one-to-one correspondence, and the second poles of the transistors M1, M2, M3, M4, and M4 are electrically connected to M (6) output terminals Out4, Out4 In a one-to one correspondence.
In the present embodiment, the gates of the transistors M1, M2, M3, M4, M5, M6 are electrically connected to the first clock signal lines CK1, CK2, CK3, CK4, CK5, CK6 in a one-to-one correspondence, the second poles of the transistors M1, M2, M3, M4, M5, M6 are electrically connected to the Data lines S1, S2, S3, S4, S5, S6 in a one-to-one correspondence, and the first poles of the transistors M1, M2, M3, M4, M5, M6 are connected to the same Data signal transmission line Data. The first clock signal lines CK1, CK2, CK3, CK4, CK5 and CK6 may be supplied with the pulse gating signal in a time-sharing manner, that is, while one of the first clock signal lines is output with the pulse gating signal, the other first clock signal lines output signals that turn off the corresponding transistor, so that the transistors M1, M2, M3, M4, M5 and M6 are turned on in a time-sharing manner, and when the corresponding transistor is turned on, the data line connected to the second pole of the transistor receives the data signal supplied from the data signal transmission line. The level of the pulse in the above-described pulse gating signal may turn on the corresponding transistor.
The operation of the multiplexer shown in fig. 8 will be further described in conjunction with the timing diagram shown in fig. 9.
In one FRAME period (1FRAME), CK1 to CK6 sequentially output active levels and sequentially turn on transistors M1 to M6, thereby sequentially outputting Data signals input from the Data signal transmission line to out1 to out 6.
Specifically, when CK1 outputs an active level, the transistor M1 is turned on, and a Data signal is output to the Data line connected to the out1 terminal through the first and second electrodes of the transistor M1; meanwhile, when CK1 outputs an active level, the transistors M2-M6 are turned off, and therefore, the terminals Out 2-Out 6 do not output display signals. When CK2 outputs an active level, the transistor M2 is turned on, and a Data signal is output to a Data line connected with the end out2 through the first pole and the second pole of the transistor M2; meanwhile, when CK2 outputs an active level, the transistor M1, the transistor M3 to the transistor M6 are turned off, and therefore, the Out1, the Out3 to the Out6 terminals do not output display signals. When CK3 outputs an active level, the transistor M3 is turned on, and a Data signal is output to a Data line connected with the end out3 through the first pole and the second pole of the transistor M3; meanwhile, when CK3 outputs an active level, the transistor M1, the transistor M2, and the transistors M4 to M6 are turned off, and therefore, the Out1, Out2, and Out4 to Out6 terminals do not output display signals. When CK4 outputs an active level, the transistor M4 is turned on, and a Data signal is output to a Data line connected with the end out4 through the first pole and the second pole of the transistor M4; meanwhile, when CK4 outputs an active level, the transistors M1 to M3, M5, and M6 are turned off, and therefore, the terminals Out1 to Out3, Out5, and Out6 do not output display signals. When CK5 outputs an active level, the transistor M5 is turned on, and a Data signal is output to a Data line connected with the end out5 through the first pole and the second pole of the transistor M5; meanwhile, when CK5 outputs an active level, the transistors M1 to M4 and M6 are turned off, and therefore, the terminals Out1 to Out4 and Out6 do not output display signals. When CK6 outputs an active level, the transistor M6 is turned on, and a Data signal is output to a Data line connected with the end out6 through the first pole and the second pole of the transistor M6; meanwhile, when CK6 outputs an active level, the transistors M1-M5 are turned off, and therefore, the terminals Out 1-Out 5 do not output display signals.
As can be seen from the above description, with the multiplexer shown in fig. 8, one data signal transmission line can transmit the display signal to 6 data lines in a time-sharing manner. Therefore, the number of data signal transmission lines can be reduced, and the narrow frame of the high PPI display device can be realized.
It should be noted that the timing diagram shown in fig. 9 is intended to further describe the operation principle of the multiplexer, and only shows the timing of each signal for driving the multiplexer in one frame, and does not show other signals for driving the touch display device and/or signals applied to the electrodes.
According to the driving method and the touch display device, at least one part of the touch detection period is set in the display intermission period, so that the time for the touch detection to occupy normal display is shortened, the number of H-lines is reduced, and the display effect is improved.
It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (13)
1. A driving method of a touch display device comprises a plurality of scanning lines, a plurality of data lines in insulated intersection with the plurality of scanning lines, a display pixel array formed by intersecting the scanning lines and the data lines, and a first touch electrode array, wherein the display pixel array comprises a plurality of display pixels arranged in an array; the first touch electrode array comprises M first touch electrodes, and M is a positive integer; characterized in that the driving method comprises:
in a display period, the first touch control electrodes are used as common electrodes, common voltage signals are applied to the first touch control electrodes, and display signals are applied to the data lines; applying a touch scanning signal to each first touch electrode during touch detection;
wherein at least a part of the touch detection period is set in a display pause period, and the display pause period comprises a field blanking period between adjacent frame periods and a line blanking period in an on interval of two adjacent scanning lines;
detecting the touch frequency of the touch display device;
if the touch frequency is lower than a first preset touch frequency, the applying a common voltage signal to each first touch electrode and applying a display signal to each data line during the display period includes:
applying a display signal to each data line in each frame period, and applying a common voltage signal to each first touch electrode;
the applying, during touch detection, a touch scan signal to each of the first touch electrodes includes:
and simultaneously applying touch scanning signals to the first touch electrodes in the field blanking stage, wherein the frame period has a first preset frame frequency.
2. The driving method according to claim 1, wherein if the touch frequency is not lower than the first preset touch frequency, the applying a touch scan signal to each of the first touch electrodes during touch detection further comprises:
applying a touch scanning signal to at least one first touch electrode in the first touch electrode array during each touch detection sub-period;
the touch detection period comprises K touch detection sub-periods, at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, K is a positive integer and is less than or equal to M.
3. The driving method according to claim 2, characterized in that:
if the touch frequency is not lower than the first preset touch frequency, at least one part of at least one touch detection sub-period is set in the line blanking period.
4. The driving method according to claim 2, wherein if the touch frequency is higher than the second predetermined touch frequency, the method further comprises:
raising the frame frequency of the frame period to a second preset frame frequency;
and the second preset touch frequency is greater than the first preset touch frequency.
5. The driving method according to any one of claims 1 to 4, characterized in that:
each first touch electrode in the first touch electrode array is arranged in a matrix;
the driving method further includes:
and receiving touch induction signals collected by each first touch electrode during touch detection.
6. The driving method according to any one of claims 1 to 4, characterized in that:
the first touch electrode is a strip-shaped electrode extending along a first direction, the touch display device further comprises a second touch electrode array, the second touch electrode array comprises a plurality of strip-shaped second touch electrodes extending along a second direction, and the first direction is intersected with the second direction;
the driving method further includes:
and receiving touch induction signals collected by the second touch electrodes during touch detection.
7. A touch display device, comprising:
a plurality of scan lines;
a plurality of data lines intersecting the plurality of scanning lines in an insulated manner;
a display pixel array formed by intersecting each of the scanning lines and the data lines, the display pixel array including a plurality of display pixels arranged in an array;
the touch electrode array comprises M touch electrodes, wherein M is a positive integer;
the integrated circuit is used for applying a common voltage signal to each touch electrode in a display period, applying a display signal to each data line and applying a touch scanning signal to each touch electrode in a touch detection period;
wherein at least a part of the touch detection period is set in a display pause period, and the display pause period comprises a field blanking period between adjacent frame periods and a line blanking period in an on interval of two adjacent scanning lines;
when the touch frequency is lower than a first preset touch frequency, the integrated circuit is used for simultaneously applying touch scanning signals to the touch electrodes in the field blanking stage and applying common voltage signals to the touch electrodes in each frame period, wherein the frame period has a first preset frame frequency.
8. The touch display device of claim 7, wherein:
when the touch frequency is higher than the first preset touch frequency, the touch detection period comprises K touch detection sub-periods, and K is a positive integer;
the integrated circuit is used for applying a touch scanning signal to at least one touch electrode in the touch electrode array during each touch detection sub-period;
at least one touch detection sub-period is arranged in a field blanking period between adjacent frame periods, and K is less than or equal to M.
9. The touch display device of claim 8, wherein:
when the touch frequency is not lower than the first preset touch frequency, at least one part of at least one touch detection sub-period is set in the line blanking period.
10. The touch display device of claim 8, wherein:
when the touch frequency is higher than a second preset touch frequency, the integrated circuit is used for applying a display signal to each data line in each frame period and providing a touch scanning signal to at least one part of touch electrodes;
the frame period has a second preset frame frequency, the first preset touch frequency is smaller than the second preset touch frequency, and the first preset frame frequency is smaller than the second preset frame frequency.
11. The touch display device according to any one of claims 7 to 10, further comprising a multiplexer and a plurality of data signal transmission lines;
one end of each data signal transmission line is electrically connected with the integrated circuit, and the other end of each data signal transmission line is electrically connected with one input end of the multiplexer and used for providing data signals to at least two data lines in a time-sharing mode through the multiplexer.
12. The touch display device of claim 11, wherein: the multiplexer includes a plurality of multiplexing units, each of the multiplexing units including m first transistors and a first clock signal line group;
the first clock signal line group comprises m first clock signal lines;
the first poles of the m first transistors of the same multiplexing unit are electrically connected with the same data signal transmission line, the grids of the m first transistors of the same multiplexing unit are respectively and correspondingly electrically connected with one first clock signal line, and the second poles of the m first transistors of the same multiplexing unit are electrically connected with one data line;
m is a positive integer.
13. The touch display device of claim 12, wherein:
m＝6。
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| CN109471566B (en) * | 2017-09-08 | 2022-03-29 | 乐金显示有限公司 | Touch display device, touch circuit and touch sensing method |
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| CN107943341B (en) * | 2017-11-10 | 2019-01-25 | 北京集创北方科技股份有限公司 | The control method and device of touch-control and display integrated system |
| US10831321B2 (en) * | 2018-04-19 | 2020-11-10 | Pixart Imaging Inc. | Parallel sensing touch control device and operating method thereof |
| KR102669730B1 (en) * | 2018-08-02 | 2024-05-28 | 삼성디스플레이 주식회사 | Display device |
| CN109254695A (en) * | 2018-11-23 | 2019-01-22 | 京东方科技集团股份有限公司 | The driving method of touch-control display panel, display device and touch-control display panel |
| TWI687911B (en) | 2018-12-11 | 2020-03-11 | 友達光電股份有限公司 | Pixel array substrate and method of driving the same |
| CN109885204B (en) * | 2019-02-28 | 2022-04-12 | 业成科技（成都）有限公司 | Touch display method, touch display control circuit and touch display device |
| US11543911B2 (en) | 2019-04-30 | 2023-01-03 | Beijing Boe Display Technology Co., Ltd. | Driving method, driving circuit and touch-display apparatus |
| CN110069173B (en) * | 2019-05-09 | 2022-10-04 | 京东方科技集团股份有限公司 | Capacitive touch panel, driving circuit and driving method thereof |
| CN110515498A (en) * | 2019-08-30 | 2019-11-29 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| 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 |
| CN114281202B (en) * | 2021-04-28 | 2024-02-02 | 厦门天马微电子有限公司 | Display panel driving method and display panel |
| CN114816117B (en) * | 2022-04-20 | 2024-09-10 | 厦门天马微电子有限公司 | Touch display panel, driving method thereof and touch display device |
| CN117501634A (en) * | 2022-05-31 | 2024-02-02 | 京东方科技集团股份有限公司 | Near field communication control method and device and display equipment |
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| US20140062899A1 (en) * | 2012-08-31 | 2014-03-06 | Au Optronics Corporation | Dynamic stop display driving mechanism for touch sensing |
| KR102061108B1 (en) * | 2013-01-16 | 2020-01-02 | 삼성디스플레이 주식회사 | Organic Light Emitting Display integrated Touch Screen Panel |
| KR101721611B1 (en) * | 2013-04-30 | 2017-03-30 | 엘지디스플레이 주식회사 | Touch screen display divice, data driver, and the method for driving the touch screen display divice |
| CN106155372B (en) * | 2015-03-26 | 2019-06-18 | 鸿富锦精密工业（深圳）有限公司 | In-cell touch display panel |
| CN104978068B (en) * | 2015-07-17 | 2019-03-01 | 京东方科技集团股份有限公司 | Touch display driving method, system, display device and application processor |
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