CN212364973U - Drive circuit, touch display device, and electronic apparatus - Google Patents
Drive circuit, touch display device, and electronic apparatus Download PDFInfo
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- CN212364973U CN212364973U CN201922469147.6U CN201922469147U CN212364973U CN 212364973 U CN212364973 U CN 212364973U CN 201922469147 U CN201922469147 U CN 201922469147U CN 212364973 U CN212364973 U CN 212364973U
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Abstract
The utility model provides a drive circuit, including signal generation unit, scanning trigger unit, data line drive unit and touch detecting element. The scanning trigger unit is used for outputting a plurality of trigger signals to the signal generating unit, and the trigger signals comprise trigger edges; the scanning trigger units output adjacent trigger signals of the signal generating unit in sequence, the trigger edge trigger signal generating unit of one trigger signal outputs a first level of a scanning signal to one scanning line, and the trigger edge trigger signal generating unit of the other trigger signal outputs a second level to the same scanning line. The data line driving unit is used for charging the pixel unit when the pixel unit is activated by the scanning signal so as to change the voltage of the pixel unit to the pixel voltage; the time from the pixel unit to start charging to the pixel voltage is the charging time. And the touch detection unit is used for performing touch detection on the touch display panel after a second preset time when the pixel unit is activated by the scanning signal.
Description
Technical Field
The utility model relates to a touch-control shows the field, especially relates to a drive circuit, touch display device and electronic equipment.
Background
An intelligent terminal (e.g., a mobile phone) is gradually developing towards a trend of being light, thin, and full-screen, and In cell technology is gradually becoming a mainstream technology for touch display In order to meet the requirement of trend development. In the In cell technology, a common electrode In an LCD screen is also used as a self-capacitance sensing electrode, so that the touch function can be realized while image display is realized.
However, multiplexing the common electrode in the display screen is prone to some technical problems. For example, on the touch display panel, the distances between the scan lines, the data lines, and the common electrodes are small, and signals loaded on the scan lines, the data lines, and the common electrodes are likely to interfere with each other during image display and touch detection. In particular, in the image display of the LCD, the driving circuit supplies display data to the data lines, which are liable to generate strong coupling interference with the common electrode as the touch detection electrode due to the charging fluctuation.
To solve the interference problem, referring to fig. 1, a signal diagram of a driving circuit In an In cell touch display device is shown.
The driving circuit transmits display data to the LCD panel for a plurality of periods of time T1, and there is a pause time T2 between the periods of transmitting display data to the LCD panel to stop transmitting display data. The drive circuit performs touch detection on the common electrode within the pause time T2.
Since the drive circuit has no longer sent display data to the LCD panel during the pause time T2. Therefore, the influence of the process of providing the display data to the LCD display screen on the touch detection can be reduced, and accordingly, the interference of the process of the touch detection on the display driving process can also be reduced.
In this driving scheme, since the display data stops being transmitted to the LCD panel during the time T2, a boundary effect of the display data is easily caused.
Referring to fig. 2, a schematic diagram of drive signals for another touch display device is shown. In order to reduce the boundary effect, the driving signal is respectively provided with a fade out vanishing area t1 and a fade in vanishing area t2 before and after the TP detection time t0 for touch detection.
During the fade out vanishing area t1 and fade in vanishing area t2, the touch display device does not perform TP detection and display, which results in waste of touch time.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application aims at solving one of the technical problems in the prior art. Therefore, the present invention needs to provide a touch display device, a driving circuit and a driving method thereof, and an electronic apparatus, so as to improve utilization rate of display time.
The application provides a this application still provides a drive circuit for drive touch display panel to realize image display and touch-control and detect, be formed with on the touch display panel: the pixel array comprises scanning lines arranged in rows, data lines arranged in columns and pixel units positioned at the junctions of the scanning lines and the data lines;
the drive circuit includes:
a signal generating unit connected to the scan lines, for generating a scan signal including a first level and a second level, the first level being different from the second level, for a scan line: when the signal generating unit provides a first level to the scanning line, the pixel unit connected with the scanning line is activated, and when the signal generating unit provides a second level to the scanning line, the pixel unit connected with the scanning line is closed;
the scanning trigger unit is used for outputting a plurality of trigger signals to the signal generating unit, and the trigger signals comprise trigger edges; the scanning trigger unit outputs adjacent trigger signals of the signal generating unit in sequence, a trigger edge of one trigger signal triggers the signal generating unit to output a first level of a scanning signal to one scanning line, and a trigger edge of the other trigger signal triggers the signal generating unit to stop outputting the first level and start outputting a second level to the same scanning line;
the data line driving unit is used for providing display data of a current row to the data line when the pixel unit is activated by the scanning signal, charging the pixel unit and changing the voltage of the pixel unit to a pixel voltage; the time from the pixel unit to start charging to the pixel voltage is charging time;
and the touch detection unit is used for performing touch detection on the touch display panel after a second preset time when the scanning signal activates the pixel unit, wherein the second preset time is greater than or equal to the charging time.
In some embodiments, the time lengths between the trigger edges of the adjacent trigger signals output by the scan trigger unit to the signal generation unit in sequence are not completely the same, and the time lengths between the trigger edges of the adjacent trigger signals include a first time length and a second time length, where the first time length is longer than the second time length.
In some embodiments, the signal generating unit generates the scanning signals according to the triggering edges of the adjacent triggering signals received successively, where the first levels of the scanning signals generated by the signal generating unit have different durations, and the scanning signals generated by the signal generating unit include a first scanning signal and a second scanning signal, where the duration of the first level of the first scanning signal is a first duration, and the duration of the first level of the second scanning signal is a second duration;
the touch detection unit is used for performing touch detection on the touch display panel after a second preset time when the first scanning signal activates the pixel unit.
In some embodiments, the trigger signal includes a rising edge and a falling edge, and the trigger edge is the falling edge.
In some embodiments, the signal generation unit and the scan trigger unit are integrated in a chip, or the signal generation unit is integrated on the touch display panel and the scan trigger unit is integrated in a chip.
In some embodiments, the touch display panel includes a plurality of common electrodes, and the touch detection unit is configured to drive the plurality of common electrodes to perform self-capacitance touch sensing.
In some embodiments, the pixel unit includes a pixel electrode, and when the touch display panel displays an image, the clamping pressure between the pixel electrode and the common electrode is a display gray scale.
In some embodiments, the scan signals generated by the signal generating unit to display one frame of image include a plurality of scan signal groups, and a scan signal group includes: a first scanning signal and at least a second scanning signal.
In some embodiments, when one-frame image display is implemented, the first scan signals in the plurality of scan signal groups appear in the same order.
In some embodiments, the time interval between the scanning signal groups is the same when one frame image display is realized.
In some embodiments, the number of scan signals in the set of scan signals is N, the image display includes a plurality of frame groups, one frame group including N frames of images;
in the scanning signals generated by the signal generating unit and corresponding to the N frames of images, the sequence of the first scanning signals in each frame of scanning signal group is different.
In some embodiments, the N frames of images are adjacent frames, and the order of the first scan signal in each frame of scan signal group changes sequentially or randomly.
In some embodiments, when the signal generating unit generates the second scan signal, the data line driving unit provides basic display data; when the signal generating unit generates a first scanning signal, the data line driving unit provides overcharge or undercharge display data corresponding to the basic display data.
In some embodiments, when the signal generating unit generates the second scan signal, the data line driving unit provides display data based on the first Gamma table; when the signal generating unit generates a first scanning signal, the data line driving unit provides display data based on a second Gamma table, and the data of the second Gamma table is over-charge or under-charge data of the first Gamma table.
In some embodiments, the time lengths between the trigger edges of the adjacent trigger signals output by the scan trigger unit to the signal generation unit in sequence are the same.
In some embodiments, the durations of the first levels of the scan signals generated by the signal generating unit according to the triggering edges of the adjacent triggering signals received successively are the same.
In some embodiments, for two adjacent scan lines: the trigger edge of a trigger signal triggers the signal generating unit to stop outputting the first level of a scanning signal and start outputting the second level to a scanning line, and simultaneously triggers the signal generating unit to output the first level of another scanning signal to another scanning line.
The present application also provides a touch display device, including:
a touch display panel;
the driving circuit is used for driving the touch display panel to realize image display and touch detection.
An electronic device, comprising: such as the touch display device described above.
Compared with the prior art, the utility model discloses technical scheme has following advantage:
the embodiment of the utility model provides a, can also be in after the second preset time of scanning signal activation pixel unit, right touch display panel carries out the touch-control and detects, second preset time is more than or equal to charge time, that is to say, the embodiment of the utility model provides a after activating pixel unit, provide display data earlier to the data line and charge to pixel unit, carry out the touch-control and detect after the completion of charging again, provide display data and touch-control to the data line and detect and go on in timesharing, can reduce the noise interference that image display detected to the touch-control to guarantee that touch-control testing process has comparatively ideal detection environment. The embodiment of the utility model provides an effectively utilized the time of pixel unit activation, carried out image display and touch-control in proper order and detected to the utilization ratio of display process time has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a signal diagram of a driving circuit of a touch display device;
FIG. 2 is a schematic diagram of drive signals for another touch display device;
fig. 3 is a functional block diagram of a driving circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the driving signals of the driving circuit shown in FIG. 3;
FIG. 5 is a diagram showing output signals of a data line driving unit in the driving circuit shown in FIG. 3;
fig. 6 is a schematic diagram of an output signal of a data line driving unit in a driving circuit according to another embodiment of the present invention;
FIG. 7 is a functional block diagram of the drive circuit shown in FIG. 6;
fig. 8 is a schematic diagram of a driving signal of a driving circuit according to still another embodiment of the present invention;
fig. 9 is a schematic diagram of an output signal of a data line driving unit in a driving circuit according to still another embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In order to solve the problem mentioned in the background art, the embodiment of the present invention provides a driving circuit, after activating the pixel unit, the time-sharing performs the touch detection and provides the action of displaying data to the data line, so that the process of touch detection and image display does not generate the signal of mutual interference, and the time of image display is fully utilized for touch detection, thereby improving the utilization rate of the display time.
The technical solution of the present invention will be described in detail with reference to the following embodiments.
With reference to fig. 3, fig. 4 and fig. 5, a functional block diagram, a schematic diagram of a driving signal and a schematic diagram of an output signal of a data line driving unit of a driving circuit according to an embodiment of the present invention are respectively shown.
It should be noted that the driving circuit of the embodiment of the present invention is used for driving the touch display panel 100 to realize image display and touch detection,
the touch display panel 100 generally includes: a first substrate (not shown) on which scan lines G1, G2 … … G are formed in a line arrangement, and a second substrate (not shown) opposite to the first substrateNData lines S1, S2 … … S arranged in columnsNAnd the pixel unit 20 is positioned at the junction of the scanning line and the data line, and the pixel unit 20 is charged according to display data so as to realize the display of an image. In particular, the touch display device may be an LCD or OLED display device.
The surface of the second substrate opposite to the first substrate or the surface of the second substrate facing back to the first substrate is further provided with a plurality of touch electrodes 30 for realizing touch detection. The touch electrode 30 may be a self-capacitance or mutual capacitance touch electrode.
In this embodiment, taking In cells as an example, a plurality of common electrodes Vcom are formed on a surface of the second substrate opposite to the first substrate, where the common electrodes are used for loading a common voltage during a display process and are also used as touch electrodes for touch detection.
A driving circuit of the touch display panel 100 for supplying the scanning lines G1 and G2 … … GNData lines S1 and S2 … … SNAnd the touch electrode provides an electrical signal to drive the image display and the touch detection of the touch display panel 100.
As shown in fig. 3, the driving circuit includes:
a signal generating unit 1011 connected to the scanning lines G1, G2 … … GNFor generating a scan signal, the scan signal including a first level and a second level, the first level being different from the second level, for a scan line (e.g., G1): when the signal generating unit 101 supplies the first level to the scan line, the pixel cell 20 connected to the scan line G1 is activated, and when the signal generating unit 1011 supplies the second level to the scan line G1, the pixel cell 20 connected to the scan line G1 is deactivated.
In this embodiment, the first level is a high level, and the second level is a low level, that is, when the scan signal is in a high state, the pixel cell 20 connected to the scan line G1 may be activated, and when the scan signal is in a low state, the pixel cell 20 connected to the scan line G1 may be deactivated. In other embodiments, the first level may be a low level, and the second level may be a high level.
The pixel unit 20 includes a control switch 201 and a pixel electrode 202 connected to the control switch 201. The control switch 201 comprises a control end, a first conducting end and a second conducting end, wherein the control end is used for controlling whether the first conducting end and the second conducting end are conducted; the control end of the control switch 201 and the scan lines G1, G2 … … GNThe first conducting terminal is connected with the data lines S1 and S2 … … SNAnd the second conducting terminal is connected with the pixel electrode 202.
The meaning of "activated" here means that the first and second conductive terminals of the control switch 201 are in a conductive state, and the data lines S1, S2 … … SNAnd the pixel electrode 202.
The term "off" means that the first and second conductive terminals of the control switch 201 are in a non-conductive state, and the data lines S1 and S2 … … SNAnd is in an off state with the pixel electrode 202.
A scan trigger unit 103, configured to output a plurality of trigger signals to the signal generating unit 1011, where the trigger signals include trigger edges; among the adjacent trigger signals successively output to the signal generating unit 1011, a trigger edge of one trigger signal triggers the signal generating unit 1011 to output a first level of a scan signal, and a trigger edge of the other trigger signal triggers the signal generating unit 1011 to stop outputting the first level and start outputting a second level to the scan line.
As shown in fig. 4, in this embodiment, the trigger signal output by the scan trigger unit 103 is a square wave signal, and includes a rising edge and a falling edge, where the falling edge is a trigger edge of the trigger signal. The trigger edge is used to trigger the scanning signal output by the signal generating unit 1011 to switch from a first level to a second level, or to switch from the second level to the first level. In other embodiments, the trigger edge may also be a rising edge.
In this embodiment, the scan trigger unit 103 outputs the adjacent trigger signals T1 and T2 to the signal generating unit 1011 in sequence, and the falling edge of T1 switches the scan signal from low level to high level, so as to trigger the signal generating unit 1011 to start outputting a high level of the scan signal; the falling edge of T2 causes the scan signal to switch from high to low, triggering the scan signal to stop outputting high and start outputting low.
Similarly, the trigger signal T2 is also used to trigger the signal generating unit 1011 to start outputting the high level of the next scan signal, and the falling edge of the trigger signal T3 adjacent to the trigger signal T2 switches the high level of the next scan signal to the low level … … so that the signal generating unit 1011 continuously outputs the scan signal.
A data line driving unit 1012 for activating and scanning lines G1, G2 … … G in the scan signalNAfter a first preset time for the connected pixel cells 20, the data lines S1, S2 … … SNThe display data for the current row is provided.
The touch detection unit 102 is configured to perform touch detection on the touch display panel 100 within the first preset time.
The embodiment of the present invention provides the scan signal activation and scan lines G1, G2 … … GNAfter a first preset time for the connected pixel cells 20, the data lines S1, S2 … … SNThe display data that provides current line, touch detecting element 102 is in carry out the touch-control and detect in the first predetermined time, that is to say, the embodiment of the utility model provides a after activating pixel element 20, reserved a section first predetermined time earlier and carried out the touch-control and detect to provide display data to the data line after the touch-control detects again, the touch-control detects and provides the process of display data to the data line because the timesharing goes on, can reduce the noise interference of image display to the touch-control detection, thereby guarantees that touch-control detection process has comparatively ideal detection environment. The embodiment of the utility model provides an effectively utilized the time of pixel unit activation, carried out touch-control detection and image display in proper order to the utilization ratio of display process time has been improved
In this embodiment, the first preset time is a time for touch detection. The duration of the first preset time needs to be set to be capable of completing at least one touch detection on the touch electrode.
As shown in fig. 4, the time lengths between the trigger edges of the adjacent trigger signals output by the scan trigger unit 103 to the signal generating unit 1011 in sequence are not completely the same. For example, a first time period a1 is between falling edges of the adjacent trigger signals T4 and T5, and a second time period a2 is between falling edges of the adjacent trigger signals T1 (or T2) and T2(T3), wherein the first time period a1 is longer than the second time period a 2.
The durations of the first levels of the scan signals generated by the signal generating unit 1011 according to the triggering edges of the adjacent triggering signals received successively are not the same, and accordingly, the scan signals generated by the signal generating unit 1011 include the first scan signal S1 and the second scan signal S2. The duration of the first level of the first scan signal S1 is a first time length a1, and the duration of the second level of the second scan signal S2 is a second time length a 1.
In this embodiment, the high level durations of the first scan signal S1 and the second scan signal S2 generated by the signal generating unit 1011 according to the falling edges of the adjacent trigger signals received in sequence are not the same.
The high level time of the first scan signal S1 is greater than the duration of the high level of the second scan signal S2.
The data line driving unit 1012 is configured to provide the display data of the current row to the data line after a first preset time TP when the first scan signal S1 starts to drive the scan line; the touch detection unit 102 is configured to perform touch detection on the touch display panel 100 within the first preset time TP.
As shown in fig. 5, in order to avoid interference of image display during the touch detection performed by the touch detection unit 102, the data line driving unit 1012 of this embodiment keeps the display data of the previous row during the first preset time TP, specifically, the voltage applied to the pixel electrode 202 is still the pixel voltage Vn-1 of the previous row. In this way, the voltages on the data lines and the pixel electrodes 202 remain unchanged, so that the touch detection process is not interfered. After the first preset time TP, the data line driving unit 1012 provides the display data of the current row to the data line, charges the pixel electrode 202 through the data line, and changes the voltage of the pixel electrode 202 into the pixel voltage Vn of the current row, so as to implement image display.
Generally, the touch detection time is 8 microseconds, the charging time for changing the voltage of the pixel electrode 202 to the pixel voltage Vn of the current row is usually 3 microseconds, and the first time period a1 is at least 11 microseconds, which satisfies the requirement that the touch detection and the pixel charging are sequentially completed in the first time period a 1.
Specifically, the operation process of the touch display panel 100 includes: when the first scan signal S1 is at a high level, the control switch 201 in the pixel unit 20 on the corresponding scan line is in an open state, so that the data line is connected to the pixel electrode 202 in the pixel unit 20; when the first scan signal S1 switches from a low level to a high level, the touch detection unit 102 is controlled to output a touch detection signal, where the touch detection signal is used to drive the common electrodes to perform self-capacitance touch sensing, so as to perform touch detection on the touch detection electrodes (i.e., the common electrodes). The touch detection unit 102 completes the touch detection of the touch detection electrode within the first preset time TP, and the data line driving unit 1012 provides the display data of the previous row to the data line within the first preset time TP. Then, when the high level of the touch detection signal is switched to the low level, the data line driving unit 1012 is controlled to provide the display data of the current row to the data line, so that the clamping voltage between the pixel electrode and the common electrode (the common electrode is loaded with the common voltage) is the display gray scale, so as to realize that the touch display panel displays the image.
The second duration a2 of the second scan signal S2 is less than the first duration a1 of the first scan signal S2, and is used for driving the scan lines to activate the pixel unit 20 to display an image. For example, the second duration a2 is 3 microseconds.
After the pixel unit 20 is activated under the control of the second scan signal S2, the data line driving unit 1012 provides display data to the data line to charge the pixel unit 20, so that the voltage of the pixel unit 20 is changed to the pixel voltage (for example, from Vn-1 to Vn), and the voltage between the pixel electrode and the common electrode (the common electrode is applied with the common voltage) is the display gray scale.
The time when the pixel unit 20 starts to charge to reach the pixel voltage is the charging time; the second time length a2 is greater than or equal to the charging time of the pixel unit, so as to ensure that the charging of the pixel unit is completed, and thus, accurate image display is realized.
As can be seen, in the present embodiment, the touch display panel 100 implements the touch detection stage (the blank square in the working stage in fig. 4) and the image display stage (the dot filling square in the working stage in fig. 4) in sequence under the control of the first scan signal S1, and implements only the image display stage (the dot filling square in the working stage in fig. 4) under the control of the second scan signal S2.
In this embodiment, in order to realize one-frame image display, the scanning signals generated by the signal generating unit 1011 include a plurality of scanning signal groups, and one scanning signal group includes: a first scan signal S1 and at least a second scan signal S2, thereby ensuring one touch detection in a group of scan signal groups.
In this embodiment, one scan signal group includes: 4 second scan signals S2 and 1 first scan signal S1, which are sequentially output. That is, one scanning signal group drives four scanning lines to realize image display through 4 second scanning signals S2; then, the scanning lines are driven by 1 first scanning signal S1, and touch detection is performed first and then image display is performed.
And repeating the scanning signal group, thereby driving all scanning lines on the touch display panel and further realizing the display of one frame of image.
When one-frame image display is realized, the first scanning signals in a plurality of scanning signal groups appear in the same order.
As shown in fig. 4, one scan signal group includes 5 driving signals: the 4 second scan signals S2 and the 1 first scan signal S1 are sequentially output, i.e., the first scan signal S1 in one scan signal group is the first. Accordingly, in the display of one frame image, the first scan signal appears in the 5 th order in each group of scan signals.
In this way, when the scan signals of one frame image are supplied, the supply of the first scan signal S1 to the K × N + J-th row of scan lines may be set according to the number N of one group of scan signals, the order J in which the first scan drive signal S1 appears, where K is a natural number.
In order to realize the display of one frame image, the time intervals between the scanning signal groups are the same when the scanning signals of one frame are supplied.
As shown in fig. 5, every 5 lines of scan signals constitute a set of scan signals. Accordingly, a scan signal group may be output every 5 rows, so that a first scan signal is provided every 5 rows for one touch detection.
Correspondingly, under the condition that the touch detection frequency requirement is not high, a group of scanning signals can be output at intervals of several lines (for example, a group of scanning signals is output every 8 lines), and the time intervals between the groups of scanning signals are kept the same. Thus, although the number of the first scanning signals in one frame of image is reduced and the corresponding number of touch detection times is reduced, the requirements of image display and touch detection are still met.
It should be noted that, the number of the scanning signals in the scanning signal group is N; in the case of performing the multi-frame display, the multi-frame image includes a plurality of frame groups, and one frame group includes N frame images. Although the first scanning signals S1 generated by the signal generating unit 1011 appear in the same order in the scanning signal group for each frame image display, the first scanning signals S1 in each frame scanning signal group appear in different orders in the scanning signals corresponding to the N frame images generated by the signal generating unit 1011.
Specifically, as shown in fig. 5, the number of the scanning signals is 5, and when 5-frame image display is performed, the order of appearance of the first scanning signal S1 is 1, 2, 3, 4, and 5, respectively (fig. 5 shows a case where the order of appearance of the first scanning signal is 5).
It should be noted that the N frames of images may be adjacent frames, and the order of the first scanning signals in each frame of scanning signal group changes sequentially or randomly.
Specifically, as shown in fig. 5, the signal generating unit 1011 displays the first scanning signal S1 in different orders when adjacent 5-frame images are displayed. For example, when displaying images of adjacent M-th to M + 5-th frames, the order of appearance of the first scan signal S1 in the scan signal group is sequentially changed by 1, 2, 3, 4, 5; or, when the images of the adjacent M-th to M + 5-th frames are displayed, the sequence of the second scanning signal appears randomly: 2. 1, 4, 5, 3, 5, 4, 2, 3, 1, 3, 5, 1, 4, 2 … …
The signal generating unit 1011 provides the first scan signals S1 in different sequences among the sets of frame scan signals. Thus, the first scan signal S1 appears on each row within N frames, so as to keep the probability of the first scan signal appearing on each row scan line the same. The touch detection actions are uniformly distributed in each row, so that the consistency of the display rows is kept, the boundary effect of pit excavation in the traditional pit excavation mode is avoided, and the uniformity of image display is ensured.
The N frame image may also be a non-adjacent frame. The order of appearance of the first scan signal S1 may be different for each of N frames of all display images. Thus, the probability of the first scanning signal S1 appearing on each row of scanning lines is substantially the same during a longer display time, and the uniformity of image display can be ensured.
With continued reference to fig. 4, the data line driving unit 1012 charges the pixel unit 20 under the control of the first scan signal S1 and the second scan signal S2, but the driving capability of the two scan signals is different because the time for turning on the control switch 21 by the first scan signal S1 and the second scan signal S2 are still different.
The data line driving unit 1012 can compensate through an under-charge technique or an over-charge technique to ensure display uniformity under the control of the first scanning signal S1 and the second scanning signal S2, thereby ensuring the effect of image display.
When the signal generating unit 1011 generates the second scanning signal S2, the data line driving unit 1012 provides 1012 basic display data; when the signal generating unit 1011 generates the first scanning signal S1, the data line driving unit 1012 provides the over-charged or under-charged display data corresponding to the basic display data.
For example, when the original display result is insufficient, the signal generating unit 1011 provides the first scanning signal S1, and the data line driving unit 1012 provides the display data with a voltage greater than the basic display data voltage; when the original display result is overcharged, the signal generating unit 1011 provides the first scanning signal S1, and the data line driving unit 1012 provides the display data with a voltage smaller than the basic display data voltage.
The under-charging technology or the over-charging technology can be realized by adjusting digital Gamma or analog Gamma.
When the signal generating unit 1011 generates the second scan signal S2, the data line driving unit 1012 provides display data based on the first Gamma table; when the signal generating unit 1011 generates the first scanning signal S1, the data line driving unit 1012 provides display data based on the second Gamma table, and the data of the second Gamma table is the over-charge or under-charge data of the first Gamma table.
For example, the gray scale corresponding to the first Gamma table is 127, and when the original display result is insufficient, the gray scale corresponding to the second Gamma table is 130, and the digital driving unit 1012 provides display data based on 130 of the second Gamma table. When the original display result is insufficient, the corresponding gray scale of the second Gamma table is 125, and the digital driving circuit 1012 provides display data based on 125 of the second Gamma table.
It should be noted that, in this embodiment, the signal generating unit 1011 and the scan trigger unit 103 are integrated in a chip of a driving circuit. In other embodiments, the signal generating unit may also be integrated on the touch display panel (i.e., the signal generating unit is directly formed on the touch display panel through a process), and the scan triggering unit is integrated in a chip of the driving circuit.
Referring to fig. 6 and fig. 7, a schematic diagram of an output signal of a data line driving unit in a driving circuit according to another embodiment of the present invention and a functional block diagram of the driving circuit are respectively shown. The same parts of this embodiment as those of the previous embodiment are not described again, and the differences between this embodiment and the previous embodiment are:
the data line driving unit 4012 is configured to enable the data lines S1 and S2 … … S within a first preset time TP when a first scan signal starts to drive the scan linesNIn a high impedance state.
By making the data lines S1, S2 … … SNIn the high impedance state, it can also be ensured that the data lines S1 and S2 … … S are in the process of performing touch detection by the touch detection unit 402 within the first preset time TPNThe signal is kept stable without interfering the touch detection process, thereby ensuring that the touch detection process has a good detection environment.
Specifically, as shown in fig. 7, a switch 404 is disposed between the data line driving unit 4012 and the data line, and is configured to be in an off state within a first preset time when the first scan signal starts to drive the scan line, so that the data lines S1 and S2 … … S are turned offNMaintaining high impedanceStatus. Thus, even if the data line driving unit 4012 is still providing display data, the display data is not loaded on the data lines S1, S2 … … SNIn the above, the display data is not loaded on the display electrode 502, so that the data line and the display electrode are in a stable stage, and interference of excessive electric signals is not generated, and touch detection is performed in this period of time, and more noise interference is not generated.
The switch 404 is further configured to be in a conducting state after a first preset time when the first scan signal starts to drive the scan line, so as to enable the data line driving unit 4012 and the data lines S1 and S2 … … SNIn the electrically connected state, the display data provided by the data line driving unit 4012 passes through the data lines S1 and S2 … … SNMay be loaded on the display electrode 502 to charge the pixel unit 50 for displaying images.
In other embodiments, other manners may be adopted to make the data line be in the high-impedance state within the first preset time when the first scan signal starts to drive the scan line.
Fig. 8 is a schematic diagram of a driving signal of a driving circuit according to still another embodiment of the present invention.
In this embodiment, the durations of the trigger edges of the adjacent trigger signals T0 output by the scan trigger unit to the signal generation unit sequentially are the same. In this way, the durations of the first levels of the scan signals S0 generated by the signal generating units according to the triggering edges of the adjacent trigger signals T0 received one after another are the same.
After the pixel unit is activated, the data line driving unit charges the pixel unit by the display data provided by the data line, so that the voltage of the pixel unit is changed to the pixel voltage; the time from the pixel unit to start charging to the pixel voltage is charging time; the first level duration of the scan signal S0 is greater than the charging time of the pixel unit, and the first preset time is a difference between the first level duration and the charging time of the pixel unit.
In this embodiment, the duration of the first level of the scan signal S0 is longer, which not only satisfies the charging time of the pixel unit, but also satisfies the touch detection time within the first preset time. The scan signal S0 of the present embodiment is equivalent to the first scan signal in the previous embodiment, i.e., each line of scan signals is firstly subjected to touch detection and then subjected to image display.
For example, the pixel unit charging time is 3 microseconds, the touch detection time is 8 microseconds, and the duration of the first level of the scan signal S0 is at least 11 microseconds. Under the control of the scanning signal, the touch detection unit performs touch detection within 8 microseconds of a first preset time, and the data line driving unit provides display data to the data lines after 8 microseconds so as to complete a pixel charging process within 3 microseconds.
Fig. 9 is a schematic diagram of an output signal of a data line driving unit in a driving circuit according to still another embodiment of the present invention. The same parts of this embodiment as those of the embodiment shown in fig. 3 to 5 are not described again, but the differences are:
in the driving circuit of this embodiment, the data line driving unit is configured to provide the display data of the current row to the data line when the pixel unit is activated by the scanning signal, charge the pixel unit, and change the voltage of the pixel unit from Vn-1 to the pixel voltage Vn; the time for the pixel unit to start charging until reaching the pixel voltage is charging time t 1; and the touch detection unit is used for performing touch detection on the touch display panel after a second preset time t2 when the pixel unit is activated by the scanning signal, wherein the second preset time t2 is greater than or equal to the charging time t 1.
In this embodiment, when the pixel unit is activated by the scanning signal, the data line driving unit charges the pixel unit to realize image display, and the second preset time t2 is greater than or equal to the charging time t1 of the pixel unit, that is, the touch detection is performed after the pixel unit is charged, and after the pixel unit is charged, signals on the data line and the pixel electrode are stable and basically unchanged, so that excessive noise interference is not easily caused in the touch detection process, thereby ensuring that the touch detection process has a relatively ideal detection environment. The embodiment of the utility model provides an effectively utilized the time of pixel unit activation, carried out image display and touch-control in proper order and detected to the utilization ratio of display process time has been improved.
Accordingly, in the case where the scanning signals of two durations generated by the signal generating unit include the first scanning signal and the second scanning signal, the image display and the touch detection are performed next time under the driving of the first scanning signal, and only the image display is performed under the driving of the second scanning signal.
The touch detection unit is used for performing touch detection on the touch display panel after a second preset time when the first scanning signal activates the pixel unit.
For example, the pixel unit charging time is 3 microseconds, and the touch detection time is 8 microseconds. The first duration of the first scanning signal is 11 microseconds, when the first scanning signal drives the scanning line, the data line driving unit charges the pixel unit within 3 microseconds before, the charging is completed after 3 microseconds, and the touch detection unit performs touch detection within 8 microseconds after the first scanning signal. The second duration of the second scanning signal is 3 microseconds, when the scanning line is driven by the second scanning signal, only the data line driving unit charges the pixel unit, and the touch detection unit does not perform touch detection.
Correspondingly, for the case that the signal generating unit is used for generating a scanning signal with a long duration, image display and touch detection can be sequentially performed at each scanning signal drive, and the touch detection unit is used for performing touch detection on the touch display panel after a second preset time for activating the pixel unit by each scanning signal.
For example, the pixel unit charging time is 3 microseconds, and the touch detection time is 8 microseconds. The duration of the scanning signal is 11 microseconds, when the scanning signal drives the scanning line, the data line driving unit charges the pixel unit within 3 microseconds before, the charging is completed after 3 microseconds, and the touch detection unit performs touch detection within 8 microseconds after the scanning signal.
For other processes of the first scan signal and the second scan signal with different durations, the scan signal with the same duration, and how the data line driving unit provides data, reference is made to the description of the previous embodiment, and no further description is given here.
The utility model also provides a touch display device, include: a touch display panel for implementing touch detection and image display; drive circuit is used for the drive touch display device realizes image display and touch detection, drive circuit does the embodiment of the utility model provides a drive circuit.
Correspondingly, the utility model also provides an electronic equipment, include the embodiment of the utility model provides a touch display device.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (19)
1. A driving circuit for driving a touch display panel to implement image display and touch detection, the touch display panel having formed thereon: the pixel array comprises scanning lines arranged in rows, data lines arranged in columns and pixel units positioned at the junctions of the scanning lines and the data lines;
characterized in that the drive circuit comprises:
a signal generating unit connected to the scan lines, for generating a scan signal including a first level and a second level, the first level being different from the second level, for a scan line:
when the signal generating unit provides a first level to the scanning line, the pixel unit connected with the scanning line is activated, and when the signal generating unit provides a second level to the scanning line, the pixel unit connected with the scanning line is closed;
the scanning trigger unit is used for outputting a plurality of trigger signals to the signal generating unit, and the trigger signals comprise trigger edges; the scanning trigger unit outputs adjacent trigger signals of the signal generating unit in sequence, a trigger edge of one trigger signal triggers the signal generating unit to output a first level of a scanning signal to one scanning line, and a trigger edge of the other trigger signal triggers the signal generating unit to stop outputting the first level and start outputting a second level to the same scanning line;
the data line driving unit is used for providing display data of a current row to the data line when the pixel unit is activated by the scanning signal, charging the pixel unit and changing the voltage of the pixel unit to a pixel voltage; the time from the pixel unit to start charging to the pixel voltage is charging time;
and the touch detection unit is used for performing touch detection on the touch display panel after a second preset time when the scanning signal activates the pixel unit, wherein the second preset time is greater than or equal to the charging time.
2. The driving circuit according to claim 1, wherein the time lengths between the trigger edges of adjacent trigger signals output by the scan trigger unit to the signal generation unit in sequence are not identical, and the time lengths between the trigger edges of the adjacent trigger signals comprise a first time length and a second time length, wherein the first time length is longer than the second time length.
3. The driving circuit according to claim 2, wherein the signal generating unit generates the scan signals according to the trigger edges of the adjacent successively received trigger signals, and the durations of the first levels of the scan signals are different, and the scan signals generated by the signal generating unit include a first scan signal and a second scan signal, wherein the duration of the first level of the first scan signal is a first duration, and the duration of the first level of the second scan signal is a second duration;
the touch detection unit is used for performing touch detection on the touch display panel after a second preset time when the first scanning signal activates the pixel unit.
4. The driving circuit of claim 1, wherein the trigger signal comprises a rising edge and a falling edge, the trigger edge being the falling edge.
5. The driving circuit according to claim 1, wherein the signal generation unit is integrated with the scan trigger unit in a chip, or wherein the signal generation unit is integrated on the touch display panel and the scan trigger unit is integrated in a chip.
6. The drive circuit according to claim 1, wherein the touch display panel includes a plurality of common electrodes, and the touch detection unit is configured to drive the plurality of common electrodes to perform self-capacitance touch sensing.
7. The driving circuit according to claim 6, wherein the pixel unit includes a pixel electrode, and when the touch display panel displays an image, the nip pressure between the pixel electrode and the common electrode is a display gray scale.
8. The drive circuit according to claim 3, wherein the scan signals generated by the signal generation unit to realize display of one frame image include a plurality of scan signal groups, a scan signal group including: a first scanning signal and at least a second scanning signal.
9. The drive circuit according to claim 8, wherein the first scan signals in the plurality of scan signal groups appear in the same order when one frame image display is realized.
10. The drive circuit according to claim 8, wherein the time intervals between the groups of the scanning signals are the same when one frame image display is realized.
11. The drive circuit of claim 8, wherein the number of the scan signals in the scan signal group is N, the image display includes a plurality of frame groups, one frame group including N frames of images;
in the scanning signals generated by the signal generating unit and corresponding to the N frames of images, the sequence of the first scanning signals in each frame of scanning signal group is different.
12. The driving circuit as claimed in claim 11, wherein the N frames of images are adjacent frames, and the sequence of the first scan signal in each frame of scan signal group is changed sequentially or randomly.
13. The driving circuit according to claim 3, wherein the data line driving unit provides basic display data when the signal generating unit generates the second scanning signal; when the signal generating unit generates a first scanning signal, the data line driving unit provides overcharge or undercharge display data corresponding to the basic display data.
14. The driving circuit according to claim 3, wherein the data line driving unit provides display data based on the first Gamma table while the signal generating unit generates the second scan signal; when the signal generating unit generates a first scanning signal, the data line driving unit provides display data based on a second Gamma table, and the data of the second Gamma table is over-charge or under-charge data of the first Gamma table.
15. The driving circuit according to claim 1, wherein the scan trigger unit outputs the adjacent trigger signals to the signal generating unit sequentially with the same time length between the trigger edges.
16. The driving circuit according to claim 15, wherein the signal generating unit generates the same duration of the first level of the scan signal according to the trigger edges of adjacent trigger signals received successively.
17. The drive circuit of claim 1, wherein for two adjacent scan lines: the trigger edge of a trigger signal triggers the signal generating unit to stop outputting the first level of a scanning signal and start outputting the second level to a scanning line, and simultaneously triggers the signal generating unit to output the first level of another scanning signal to another scanning line.
18. A touch display device, comprising:
a touch display panel;
the driving circuit according to any of claims 1-17, configured to drive a touch display panel to implement image display and touch detection.
19. An electronic device, comprising: the touch display device of claim 18.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2019217176057 | 2019-10-14 | ||
| CN201921717605 | 2019-10-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113064526A (en) * | 2021-04-13 | 2021-07-02 | 合肥松豪电子科技有限公司 | Scanning method of touch panel TP applied to TDDI chip encountering pit |
| CN113986052A (en) * | 2021-10-29 | 2022-01-28 | 福建华佳彩有限公司 | Driving method for improving touch sensitivity |
-
2019
- 2019-12-31 CN CN201922469147.6U patent/CN212364973U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113064526A (en) * | 2021-04-13 | 2021-07-02 | 合肥松豪电子科技有限公司 | Scanning method of touch panel TP applied to TDDI chip encountering pit |
| CN113986052A (en) * | 2021-10-29 | 2022-01-28 | 福建华佳彩有限公司 | Driving method for improving touch sensitivity |
| CN113986052B (en) * | 2021-10-29 | 2023-12-01 | 福建华佳彩有限公司 | Driving method for improving touch sensitivity |
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