CN114967968A - Drive circuit, touch display device and electronic equipment - Google Patents

Drive circuit, touch display device and electronic equipment Download PDF

Info

Publication number
CN114967968A
CN114967968A CN202210398970.6A CN202210398970A CN114967968A CN 114967968 A CN114967968 A CN 114967968A CN 202210398970 A CN202210398970 A CN 202210398970A CN 114967968 A CN114967968 A CN 114967968A
Authority
CN
China
Prior art keywords
signal
touch
unit
touch detection
pixel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202210398970.6A
Other languages
Chinese (zh)
Inventor
王洁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Xihua Technology Co Ltd
Original Assignee
Shenzhen Xihua Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Xihua Technology Co Ltd filed Critical Shenzhen Xihua Technology Co Ltd
Publication of CN114967968A publication Critical patent/CN114967968A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • 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
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The application provides a drive circuit, a touch display device and an electronic device. The control unit controls the touch detection unit to perform touch detection based on an oscillation signal when the scanning line driving unit activates the pixel points, and is also used for controlling the data line driving unit to provide pixel voltage for the activated pixel points after the touch detection; the control unit generates the oscillation signal when performing touch detection, so that the signal on the touch display panel is a signal which changes along with the change of the oscillation signal. The touch display device comprises the driving circuit. The electronic equipment comprises the touch display device.

Description

Drive circuit, touch display device and electronic equipment
Technical Field
The present application relates to the field of touch display technologies, and in particular, to a driving circuit, a touch display device and an electronic apparatus.
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 the LCD screen is also used as a self-capacitance sensing electrode, so that the touch function can be realized while the image display is realized.
When the common electrode is also used as the touch detection electrode, the prior art performs touch sensing on the touch sensing electrode at the row gap to reduce interference between image display data and touch detection. However, as the resolution of the touch display device is gradually increased, the line gap and the frame gap are significantly compressed, and accordingly, the time for touch detection is also compressed, thereby easily causing a problem of insufficient touch detection.
Meanwhile, touch detection is performed simultaneously in the image display refreshing process, so that the problems of mutual interference of signals, generation of large parasitic capacitance and the like exist, and the signal-to-noise ratio of touch detection is easily influenced.
Disclosure of Invention
The embodiment of the application provides a driving circuit, a touch display device and an electronic device, and improves a detection signal-to-noise ratio.
In order to solve the technical problem, the present application provides a driving circuit for driving a touch display panel to implement image display and touch detection, wherein the touch display panel includes: the scanning line, the data line and a plurality of pixel points are arranged in rows, and the pixel points are positioned at the junction between the scanning line and the data line; the drive circuit includes:
a scanning line driving unit for activating a pixel point connected to the scanning line;
a data line driving unit for supplying a pixel voltage to the activated pixel point through the data line;
the touch detection unit is used for performing touch detection on the touch display panel;
the control unit is used for controlling the touch detection unit to perform touch detection based on an oscillation signal when the scanning line driving unit activates the pixel point, and is also used for controlling the data line driving unit to provide pixel voltage for the activated pixel point after the touch detection;
the control unit generates an oscillation signal during touch detection, so that a signal on the touch display panel is a signal which changes along with the change of the oscillation signal.
Optionally, the scan line driving unit is configured to generate a scan signal, the scan signal includes a first signal and a second signal, the first signal is different from the second signal, and for a scan line: when the scanning line driving unit provides a first signal to the scanning line, the pixel point connected with the scanning line is activated, and when the scanning line driving unit provides a second signal to the scanning line, the pixel point connected with the scanning line is closed.
Optionally, the control unit includes: the trigger unit is used for controlling the scanning line driving unit to generate a first scanning signal and a second scanning signal which have different first signal duration, wherein the first signal duration of the first scanning signal is a first duration, the first signal duration of the second scanning signal is a second duration, and the first duration is longer than the second duration;
the control unit is used for controlling the touch detection unit to perform touch detection based on the oscillation signal when the scanning line driving unit provides the first scanning signal to the scanning line to activate the pixel point; and the data line driving unit is also used for controlling the data line driving unit to charge the activated pixel points after touch detection.
Optionally, the control unit is configured to control, after the touch detection, the data line driving unit to charge the activated pixel for at least the second duration, and the time for the touch detection unit to perform the touch detection is the touch time; the first duration is greater than or equal to the sum of the second duration and the touch time.
Optionally, the scan signals generated by the scan line driving unit to display an image of one frame include a plurality of scan signal groups, one scan signal group including: a first scanning signal and at least a second scanning signal.
Optionally, the control unit is configured to control the data line driving unit to maintain a current pixel voltage or make the data line in a high impedance state within a first preset time when the first scanning signal drives the scanning line; controlling the touch display panel to perform touch detection based on the oscillation signal within the first preset time;
the control unit is further configured to control the data line driving unit to charge the pixel point after a first preset time when the first scan signal starts to drive the scan line.
Optionally, a switch is disposed between the data line driving unit and the data line, and the control unit is configured to control the switch to be in a disconnected state within a first preset time when a first scanning signal starts to drive the scanning line, so that the data line is in a high-impedance state; and the control circuit is also used for controlling the switch to be in a conducting state after a first preset time when the first scanning signal starts to drive the scanning line so as to provide the pixel voltage for the data line.
Optionally, the control unit is configured to modulate, through the oscillation signal, a signal output to the touch display panel by the driving circuit during touch detection, so as to obtain a modulated signal; or the touch display panel superposes the oscillation signal due to capacitive coupling.
Optionally, the pixel point includes a pixel electrode and a common electrode, the data line driving unit is configured to provide a pixel voltage to the pixel electrode to perform image display, the driving circuit further includes a common voltage generating circuit, the common voltage generating circuit is configured to provide a common voltage to the common electrode to perform image display, and the touch detection unit is configured to provide a touch driving signal to the common electrode to perform touch detection.
Optionally, the touch detection unit is configured to provide a touch driving signal to the same common electrode and perform image display and self-capacitance touch detection at the same time.
Optionally, the driving circuit further includes a data selection unit, the touch detection unit and the common voltage generation circuit are both connected to the data selection unit, the data selection unit is respectively connected to the plurality of common electrodes, and the data selection unit is configured to select which common electrodes the common voltage is output to, and select which common electrodes the touch driving signal is output to.
Optionally, when performing touch detection, the touch detection unit provides the touch driving signal to a part of the common electrodes each time to perform self-capacitance touch sensing, and the common voltage generation circuit provides a common voltage to all or a part of the remaining common electrodes each time to perform image display, where the touch driving signal is the same as the common voltage.
Optionally, the signal provided by the scan line driving circuit to the scan line, the signal provided by the data line driving circuit to the data line, the signal provided by the touch detection unit to the common electrode, and the signal provided by the common voltage generation circuit to the common electrode are both modulation signals obtained by modulating the oscillation signal.
Optionally, the driving circuit includes an output end, where the output end is used as an output ground end, and when the driving circuit drives the touch display panel to perform touch detection, the output end is used to output the oscillation signal, and when the driving circuit drives the touch display panel to perform image display instead of performing touch sensing, the output end is used to output a ground signal.
Optionally, the scan line driving unit, the data line driving unit, the touch detection unit, and the common voltage generation circuit are connected to the output terminal.
Optionally, the signal on the touch display panel increases with the increase of the oscillation signal and decreases with the decrease of the oscillation signal.
Optionally, the control unit generates an oscillation signal during touch detection, so that the signal on the touch display panel is a signal that changes synchronously with the change of the oscillation signal.
The present application further provides a touch display device, including:
a touch display panel comprising: the pixel array comprises scanning lines arranged in rows, data lines arranged in columns and a plurality of pixel points, wherein the pixel points are positioned at the junction of the scanning lines and the data lines;
the driving circuit is used for driving the touch display panel to realize image display and touch detection;
the signal on the touch display panel is a signal modulated by an oscillation signal or a signal which changes along with the change of the oscillation signal due to capacitive coupling.
Optionally, the control unit includes an output ground terminal, configured to output a ground signal when the pixel point is charged, and output an oscillation signal generated based on the ground signal when the touch detection is performed; and a grounding wire is also formed on the touch display panel and is connected with the output grounding terminal.
The application also provides an electronic device comprising the touch display device.
Compared with the prior art, the technical scheme of the application has the following advantages:
in addition, the control unit of the driving circuit in the embodiment of the application generates an oscillation signal when performing touch detection, so that the signal on the touch display panel is a signal which changes along with the change of the oscillation signal, thereby reducing the pressure difference change among conductors such as a pixel electrode, a common electrode, a scanning line, a data line and the like on the touch display panel, further reducing the charge and discharge electric quantity of a parasitic capacitor, and improving the detection signal-to-noise ratio of the touch detection.
Drawings
FIG. 1 is a functional block diagram of a touch display device according to an embodiment of the present disclosure;
FIG. 2 is a functional block diagram of the control unit of FIG. 1;
FIG. 3 is a schematic diagram of output signals of a driving circuit of the touch display device shown in FIG. 1;
FIG. 4 is a signal enlarged diagram of a driving circuit of the touch display device shown in FIG. 1;
FIG. 5 is a circuit diagram of the modulation unit shown in FIG. 2;
FIG. 6 is a functional block diagram of a touch display device according to another embodiment of the present application;
FIG. 7 is a schematic structural diagram of a touch display panel adopting a single-gate mode according to an embodiment of the present disclosure;
FIG. 8 is a schematic structural diagram of a touch display panel adopting a dual gate mode according to an embodiment of the present application;
FIG. 9 is a schematic structural diagram of a touch display panel employing a MUX1:3 mode according to an embodiment of the present disclosure;
FIG. 10 is a functional block diagram of a touch display device according to another embodiment of the present application;
FIG. 11 is a schematic diagram of output signals of a driving circuit of the touch display device shown in FIG. 10;
FIG. 12 is an enlarged signal diagram of a driving circuit of the touch display device shown in FIG. 10;
fig. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.
Touch display Panel the touch display panel is provided to make the above objects, features and advantages of the present application more comprehensible, and embodiments thereof are described in detail below with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The thickness and size of each layer shown in the drawings may be exaggerated, omitted, or schematically illustrated for convenience or clarity, and the number of relevant elements may be schematically illustrated. In addition, the size of the elements does not fully reflect the actual size, and the number of related elements does not fully reflect the actual number. There may be instances where the number of identical or similar or related elements in various figures may be non-uniform, e.g., due to differing figure sizes. The same reference numbers in the drawings identify the same or similar structures. It should be noted, however, that in order to make the reference numbers regular and logical, in some different embodiments, the same or similar elements or structures are given different reference numbers, and those skilled in the art can directly or indirectly determine the relationship according to the technical relevance and the related text.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the application.
Further, the following terms are exemplary and are not intended to be limiting in any way. After reading this application, those skilled in the art will recognize that these terms apply to techniques, methods, physical elements, and systems (whether currently known or not), including extensions thereof that may be inferred or inferred by those skilled in the art after reading this application.
In the description of the present application, it is to be understood that: the "plurality" includes two or more, "the" plurality of rows "includes two or more rows, and" the "plurality of columns" includes two or more columns, unless the present application specifically defines otherwise. In addition, the terms "first", "second", "third", "fourth" (if appearing) and the like in the names of the elements and the names of the signals do not limit the sequence of the elements or the signals, but are used for facilitating the naming of the elements and clearly distinguishing the elements, so that the description is simpler and easier to understand.
Next, each embodiment of the present application will be explained.
With reference to fig. 1 to fig. 3, a functional block diagram and a driving signal diagram of a touch display device according to an embodiment of the present disclosure are respectively shown. The touch display device 1 includes a touch display panel 10 and a driving circuit 100. The driving circuit 100 is used for driving the touch display panel 10 to perform image display and touch detection.
The touch display panel 10 generally includes: a first substrate (not shown) and a second substrate (not shown) disposed opposite to the first substrate. The first substrate is provided with scanning lines G1, G2 … … G arranged in rows N Data lines S1, S2 … … S arranged in columns N And pixel sites 20 located at the intersections of the scan lines and data lines. The pixel 20 is used for receiving the display data from the driving circuit 100 to charge, so as to display an image. The touch display panel 10 is, for example, a Liquid Crystal Display (LCD) panel, and accordingly, the touch display device 1 is a liquid crystal display device. However, the touch display panel 10 may alternatively be any suitable display panel such as an electronic paper display panel, an organic light emitting diode display (OLED) panel, or the like.
A plurality of touch electrodes are further arranged between the second substrate and the first substrate and used for achieving touch detection. The touch electrode can be a self-capacitance or mutual capacitance touch electrode.
In the embodiments of the present application, an In cell is taken as an example, a plurality of common electrodes 203 are formed between the second substrate and the first substrate, and the common electrodes 203 are used for loading common voltages to perform image display In a display process and are also used as touch electrodes for touch detection.
The driving circuit 100 is used for driving the scanning lines G 1 、G 2 ……G N Supplying driving signals to the data lines S1, S2 … … S N Providing a display numberAccordingly, the touch panel is further configured to provide an ac excitation signal to the touch electrode (i.e., the common electrode 203), so as to implement image display and touch detection of the touch display panel 10.
As shown in fig. 1, the driving circuit 100 includes a control unit 101, a scanning line driving unit 102, a data line driving unit 103, a touch detection unit 104, a common voltage generation circuit 105, and a data selection unit 106. The control unit 101 is connected to the scan line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105, respectively. The touch detection unit 104 and the common voltage generation circuit 105 are further connected to the data selection unit 106. The data selection unit 106 is further connected to the plurality of common electrodes 203.
The scanning line driving unit 102 is connected to the scanning line G 1 、G 2 ……G N For generating scan signals including a first signal and a second signal, the first signal being different from the second signal, for a scan line (e.g., G) 1 ): when the scan line driving unit 102 provides the first signal to the scan line G 1 At the same time with the scanning line G 1 When the connected pixel point 20 is activated, the scan line driving unit 102 provides the second signal to the scan line G 1 And with the scanning line G 1 The connected pixel points 20 are closed. Optionally, part or all of the scan line driving unit 102 is integrated on the touch display panel 10, for example, by a gia (gate In array) technology. However, alternatively, part or all of the scan line driving unit 102 may be integrated into a chip or may be a separate circuit module. Alternatively, a part of the scan line driving unit 102 may be integrated on the touch display panel 10 by, for example, a gia (gate In array) technology, a part of the scan line driving unit may be integrated In a chip, or may be an independent circuit module.
It should be noted that, in this embodiment, the first signal is, for example, a high level signal, and the second signal is, for example, a low level signal, that is, the scan signal is at a high levelIn the level state, the AND scan line G can be set 1 The connected pixel points 20 are activated, and when the scanning signal is in a low level state, the scanning signal can be connected with the scanning line G 1 The connected pixel 20 is turned off and is in a non-charged state. However, alternatively, in some other embodiments, the first signal may be a low level signal, and the second signal may be a high level signal.
The pixel 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 scanning line G 1 、G 2 ……G N Connected with the first conducting terminal and the data line S 1 、S 2 ……S N And the second conducting terminal is connected with the pixel electrode 202.
Each pixel 20 further comprises, for example, one common electrode 203, or a plurality of pixels 20 share one common electrode 203, or a combination of the foregoing two. Optionally, the plurality of common electrodes 203 are located in the same layer and arranged regularly or irregularly. The present application is not limited to the foregoing.
The meaning of "active" here means that the first conducting terminal and the second conducting terminal of the control switch 201 are in a conducting state, and the data line S is in a conducting state 1 、S 2 ……S N And the pixel electrode 202.
The term "off" means that the first conducting terminal and the second conducting terminal of the control switch 201 are in a non-conducting state, and the data line S is 1 、S 2 ……S N And the pixel electrode 202 is in an off state.
The data line driving unit 103 is used for activating and scanning lines G in the scanning signal 1 、G 2 ……G N After the connected pixel points 20, to the data line S 1 、S 2 ……S N The display data for the current row is provided.
Specifically, the data line driving unit 103 is configured to provide the display data to the pixel electrode 202 as a pixel voltage.
When the data line driving unit 103 supplies display data, the capacitor formed by the pixel electrode 202 and the common electrode 203 is charged, and the voltage difference between the pixel electrode 202 and the common electrode 203 is a gray scale voltage, so that image display is realized.
The data line driving unit 103 drives the data line S 1 、S 2 ……S N The provided display data is used to charge the pixel 20. The charging time is defined as the time for charging the pixel electrode 202 of the pixel 20 or the data line connected to the pixel electrode 202 to reach the target voltage. When the voltage on the pixel electrode 202 or the data line reaches the target voltage, the charging of the pixel point 20 is completed. The target voltage is, for example, the same as or close to the pixel voltage.
Since there are often adverse effects of parasitic inductance, parasitic resistance, parasitic capacitance, and the like in the circuit loop, the target voltage and the pixel voltage are often in a close state. When the target voltage is close to the pixel voltage, the absolute value range of the voltage difference between the pixel voltage and the target voltage is a preset range. The predetermined range is, for example, but not limited to, greater than 0 mv or less than or equal to 8 mv, or greater than 0 mv or less than or equal to 5 mv. The charging time is, for example, but not limited to, 4us to 5 us. The absolute value range and the charging time range of the pressure difference are only examples, and the absolute value range and the charging time range of the pressure difference are correspondingly different according to different arrangement structures or different driving modes of the pixel points 20 of the touch display device 1. This is not a limitation of the present application.
The touch detection unit 104 is configured to perform touch detection on the touch display panel 10. Specifically, for example, the touch detection unit 104 is configured to provide a touch driving signal to the corresponding common electrode 203 to drive the common electrode 203 to perform touch detection.
The common voltage generating circuit 105 is configured to provide a common voltage to the common electrode 203 to drive the common electrode 203 to perform image display.
The data selection unit 106 is configured to select which common electrodes 203 the touch driving signal is output to, and select which common electrodes 203 the common voltage is output to.
Specifically, the common electrode 203 is reused as a touch detection electrode, and the touch detection unit 104 is configured to apply an alternating excitation signal to the common electrode 203 as the touch driving signal, so as to implement touch detection by detecting a change in self-capacitance between a finger and the common electrode 203 (or a change in mutual capacitance between the common electrodes 203 caused by the finger).
The time when the touch detection unit 104 performs touch detection on the common electrode 203 is defined as touch time. The touch time is, for example, but not limited to, 4us to 5 us.
It should be noted that the resolution requirement in the image display process is relatively high, and the touch detection is mainly for identifying the touch detection position, and it is not necessary to make the touch detection electrode as the common electrode 203 of each pixel 20 precisely, so in practical application, it may be selected to perform touch detection on part of the common electrodes 203 or all the common electrodes 203 according to the accuracy requirement of the touch detection and the resolution.
The control unit 101 is configured to control the data line driving unit 103 to provide the display data, i.e., the pixel voltage, to the pixel 20 when the scan line driving unit 102 activates the pixel 20, and is further configured to control the touch detection unit 104 to perform touch detection based on an oscillation signal after the display data charges the pixel 20.
In this embodiment, after the switch 201 is controlled to be in the on state under the driving of the scan signal, the pixel voltage is applied to the pixel electrode 202 for charging; after the charging is completed, an alternating current signal is applied to the common electrode 203 for touch detection. That is to say, the touch detection is performed after the pixel voltage on the pixel electrode 202 of the pixel 20 is charged, and after the pixel 20 is charged and during the touch detection, the signals on the data line and the pixel electrode 202 are kept stable with respect to the oscillation signal MGND (see the following description), that is, the signals are not changed with respect to the oscillation signal MGND, so that the touch detection process is not easily interfered by excessive noise, thereby ensuring an ideal detection environment during the touch detection process. The embodiment of the application effectively utilizes the time for activating the pixel points 20, and performs image display refreshing and touch detection, thereby improving the utilization rate of the time in the display process.
For each pixel 20, the image display status generally includes an image display refresh status and an image display hold status. Taking a single pixel 20 as an example, when the driving circuit 100 provides a pixel voltage to the pixel electrode 202 and provides a common voltage to the common electrode 203, the pixel 20 starts to perform image display refresh, and after the pixel voltage is written to the pixel electrode 202, the control switch 201 of the pixel 20 is turned off, so that the pixel voltage is stopped being provided to the pixel electrode 202, and the image display refresh is completed. Then, the pixel 20 enters an image display hold state until the control switch 201 of the pixel 20 is turned on next time to receive the pixel voltage.
Typically, the plurality of pixel points 20 are arranged in a determinant, for example. The driving circuit 100 typically drives the pixel sites 20 row by row to perform an image display refresh.
Accordingly, in order to implement image display refresh and touch detection under the driving of one scanning signal, the duration of the scanning signal in the first signal needs to be greater than or equal to the sum of the charging time and the touch time, so that enough time can be provided for executing two steps of image display refresh and touch detection under the driving of one scanning signal.
As shown in fig. 2, in the driving circuit 100 of the present embodiment, the control unit 101 includes a trigger unit 1011 and a modulation unit 1012. The trigger unit 1011 is connected to the modulation unit 1012, the data selection unit 105, the data line driving unit 103, and the scan line driving unit 102, and is configured to control the modulation unit 1012, the data selection unit 105, the data line driving unit 103, and the scan line driving unit 102 to operate.
As shown in the signal diagram of fig. 3, the scan signals generated by the scan line driving unit 102 under the control of the flip-flop unit 1011 include a first scan signal S1 and a second scan signal S2. The duration of the first signal of the first scan signal S1 is a first time length a1, and the duration of the first signal of the second scan signal S2 is a second time length a 2. The first time period a1 is greater than or equal to the sum of the charging time and the touch time so that pixel charging and touch detection can be completed under the drive of a first scan signal, and the second time period a2 is less than the first time period a1 and greater than or equal to the charging time so that pixel charging can be completed under the drive of a second scan signal.
As can be seen, in the present embodiment, the touch display panel 10 performs the image display refresh first under the control of the first scan signal S1, (the working phase point filling block in fig. 3) and then performs the touch detection simultaneously after the image display refresh reaches a predetermined time (the working phase blank block in fig. 3), i.e., the touch detection phase is partially overlapped with the image display refresh phase, and only the image display refresh is performed under the control of the second scan signal S2 (the working phase point filling block in fig. 3). The preset time is greater than or equal to the charging time, but less than or equal to the sum of the first time length a1 and the touch time. Alternatively, the predetermined time may be the same as or similar to the second time period a 2.
The data line driving unit 103 is used for driving the data lines S during the refreshing of the image display 1 、S 2 ……S N The display data of the current row is provided, and the pixel 20 is charged, so that the voltage of the pixel 20 is changed from Vn-1 to the pixel voltage Vn (see fig. 4).
The triggering unit 1011 is configured to further control the touch display panel 10 to perform touch detection when the scan line driving unit 102 is controlled to output the first scan signal S1 and after the pixel point P is charged.
Specifically, after the scan line driving unit 102 outputs the first scan signal S1 for the second duration a2, the trigger unit 1011 outputs the touch trigger signal TP to the modulation unit 1012, and controls the modulation unit 1012 to generate the oscillation signal. The trigger unit 1011 further controls the data selection unit 106 to output the touch driving signal to the corresponding common electrode 203 to perform touch detection. During the touch detection of the touch display panel 10, the electrical signal thereon changes with the change of the oscillation signal.
For example, but not limited to, the charging time of the pixel 20 is 5 microseconds, and the touch detection time is 5 microseconds. The first duration a1 of the first scan signal is, for example, 10 microseconds, when the first scan signal S1 drives the scan line, the data line driving unit 103 charges the pixel 20 in the first 5 microseconds, the voltage on the pixel electrode 202 reaches the target voltage after 5 microseconds, the charging is completed, and the touch detection unit 104 performs touch detection in the second 5 microseconds after the first scan signal S1. The second duration a2 of the second scan signal S2 is, for example, 5 μ sec, and when the second scan signal S2 drives the scan lines, only the data line driving unit 103 charges the pixel points 20, and the touch detection unit 104 does not perform touch detection. It should be noted that the charging time and the touch detection time are only examples, and the present application is not limited thereto. Based on the technical idea of the present application, the protection scope of the present application shall be covered.
It should be noted that, the charging completion of the pixel 20 is defined by the user when the voltage charging on the pixel reaches the target voltage, and the user defines that the charging is completed. However, in an actual circuit, after the voltage at the pixel 20 reaches the target voltage, the charging may be continued, but the charging is very slow and the voltage change is small.
In this embodiment, in order to realize one-frame image display, the scan signals generated by the scan line driving unit 102 include a plurality of scan signal groups, and one scan 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 way, the purpose of performing touch detection every few rows is achieved by the first scan signal S1, and the setting of the second scan signal S2 can be made shorter.
As shown in fig. 3, one scan signal group includes: 4 second scan signals S2 and 1 first scan signal S1, which are sequentially output. That is, one scan signal group drives four scan lines to implement image display refresh by 4 second scan signals S2; then, the scanning lines are driven by 1 first scanning signal S1 to refresh the image display for a predetermined time, and then the touch detection is performed at the same time. The preset time is greater than or equal to the charging time, or the preset time is the same as or similar to the second time length a 2.
It should be noted that, based on the difference between the image display resolution and the touch detection accuracy, the touch detection is not performed every 4 lines of scanning signals, but is performed every two lines of scanning signals.
In other embodiments, different intervals may be set, and only one set of scan signals is output every other row (e.g., every 8 rows outputs a first scan signal S1), and the time interval between each set of scan signals remains the same, for example. Thus, although the number of the first scan signals S1 in one frame of image is reduced and the number of corresponding touch detections is reduced, the requirements of image display and touch detection are still met.
The scanning signal group is repeated, so that all the scanning lines on the touch display panel 10 are driven, and further, the display of one frame of image is realized.
Under the control of the first scan signal S1 and the second scan signal S2, the data line driving unit 103 charges the pixel point 20, but the driving capability of the two scan signals is different because the time for the first scan signal S1 and the second scan signal S2 to turn on the control switch 201 is still different.
The data line driving unit 103 may 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 an effect of the image display.
When the scan line driving unit 102 generates the second scan signal S2, the data line driving unit 103 provides basic display data; when the scan line driving unit 102 generates the first scan signal S1, the data line driving unit 103 provides the over-charged or under-charged display data corresponding to the basic display data.
For example, when the original display result is insufficient, and the scan line driving unit 102 provides the first scan signal S1, the data line driving unit 103 provides display data with a voltage greater than the voltage of the basic display data; when the original display result is overcharged, the data line driving unit 103 provides display data with a voltage smaller than the basic display data voltage when the scan line driving unit 102 provides the first scan signal S1.
In addition, the realization of the under-charging technology or the over-charging technology can also be realized by adjusting digital Gamma or analog Gamma.
It should be noted that, in the embodiment of the present application, the control unit 101 generates an oscillation signal. Here, the oscillation signal refers to a signal whose voltage changes according to a certain frequency, for example, a square wave signal, a rectangular wave signal, and the like are one of the oscillation signals.
In this embodiment, the oscillation signal is a square wave signal, and includes a first reference signal and a second reference signal that appear alternately, and the voltage condition of the first reference signal and the voltage condition of the second reference signal may be any one of the following five conditions:
firstly, the method comprises the following steps: the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V;
secondly, the method comprises the following steps: the voltage of the first reference signal is 0V, and the voltage of the second reference signal is negative voltage;
thirdly, the method comprises the following steps: the voltage of the first reference signal is a positive voltage, the voltage of the second reference signal is a negative voltage, and the absolute value of the voltage of the first reference signal is equal to or not equal to the absolute value of the voltage of the second reference signal;
fourthly: the voltages of the first reference signal and the second reference signal are positive voltages with different magnitudes;
fifth, the method comprises the following steps: the voltages of the first reference signal and the second reference signal are negative voltages with different magnitudes.
It should be noted that the oscillating signal may also be other suitable waveform signals, such as a sine wave signal, a two-step signal, and so on. The oscillating signal is not limited to a periodically varying signal, and may be a non-periodically varying signal.
In this application, the electric signal on the touch display panel 10 changes with the change of the oscillation signal through the oscillation signal. For example, but not limited to, the signal on the touch display panel 10 increases with the increase of the oscillation signal and decreases with the decrease of the oscillation signal. Optionally, the electrical signal on the touch display panel 10 changes synchronously with the change of the oscillation signal. Compared with the traditional scheme (the common electrode on the touch display panel is an alternating current signal, and the voltage on the pixel electrode is in a static holding state), the embodiment of the application can reduce the pressure difference change between conductors by synchronously changing the signals on the conductors such as the pixel electrode 202, the common electrode 203, the scanning line, the data line and the like, thereby reducing the charge and discharge electric quantity of parasitic capacitance and further improving the detection signal-to-noise ratio of touch detection.
In addition, since the touch driving signal for driving the common electrode 203 to perform touch detection and the common voltage for driving the common electrode to perform image display are both signals varying in synchronization with the oscillation signal, the touch driving signal applied by the touch detection unit 104 to the common electrode 203 to perform touch detection and the common voltage applied by the common voltage generation circuit 105 to the common electrode 203 to perform image display may be the same voltage signal, and thus, the touch driving signal may drive the same common electrode 203 to perform image display while driving the same common electrode 203 to perform touch sensing. Accordingly, in the process of driving the touch display panel 10 to perform the image display refresh, the driving circuit 100 may also drive the touch display panel 10 to perform the touch sensing at the same time, and the mutual influence between the touch sensing and the image display refresh is small, so that the user experience can be improved.
As shown in fig. 2, the control unit 101 further includes the modulation unit 1012, configured to generate the oscillation signal during touch detection, where the oscillation signal is used to modulate a signal output by the driving circuit 100 to the touch display panel 10 to obtain a modulation signal.
Specifically, the modulation unit 1012 is connected to the trigger unit 1011, and generates an oscillation signal under the control of the touch trigger signal TP output by the trigger unit 1011. For example, the modulation unit 1012 starts generating the oscillation signal when the touch trigger signal TP rises, and the modulation unit 1012 stops generating the oscillation signal when the touch trigger signal TP falls. However, the touch trigger signal TP may be other suitable signals, and is not limited to the rising edge and the falling edge of the touch trigger signal TP shown in fig. 3 for controlling the starting time and the ending time of the oscillation signal generated by the modulation unit 1012, for example, and it is within the scope of the present application as long as the touch trigger signal TP can control various embodiments of the modulation unit 1012 capable of generating the oscillation signal. In addition, in the embodiment of fig. 3, the touch trigger signal TP may also be a signal that varies with the variation of the oscillation signal.
In the embodiment of the present application, the scan line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105 are all connected to the modulation unit 1012. The oscillation signal generated by the modulation unit 1012 is used to modulate signals output to the touch display panel 10 by the scan line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105, so that the signals output to the touch display panel 10 are all modulation signals obtained by modulating the oscillation signal. The signal received by the touch display panel 10 is the modulation signal, and may change synchronously with the oscillation signal, for example, the modulation signal rises with the rise of the oscillation signal and falls with the fall of the oscillation signal. In addition, the modulation signal may also cause other conductors on the touch display panel 10 to superimpose the oscillation signal due to capacitive coupling.
Alternatively, the modulation unit 1012 may also directly output the oscillation signal to the touch display panel 10.
Therefore, signals on the touch display panel 10 can all rise along with the rise of the oscillation signal and fall along with the fall of the oscillation signal in various ways, so that the signals on the conductors on the touch display panel 10 are in a synchronous change state, the pressure difference change between the conductors is reduced, and the charging and discharging electric quantity of the parasitic capacitance is further reduced.
As shown in fig. 2, the control unit 101 further includes: an input for receiving a base signal; a voltage generating unit 1013 configured to provide a driving voltage, where the driving voltage is a reference voltage of the oscillation signal; the modulation unit 1012 is connected to the input terminal and voltage generation unit 1013, and generates the oscillation signal according to the basic signal and the driving voltage under the control of the touch trigger signal TP; and outputting the basic signal when the touch trigger signal TP is not received. The end of the modulation unit 1012 outputting the oscillation signal or the base signal is defined as an output end.
Specifically, the modulation unit 1012 is an oscillation generating circuit, and forms an oscillation signal alternately output by the first reference signal and the second reference signal according to the voltage provided by the voltage generating unit 1013 and the input terminal as the first reference signal and the second reference signal, respectively.
Here, the oscillation frequency of the oscillation signal may be the same as the frequency of the touch driving signal, so that when the touch detection unit 104 is modulated based on the oscillation signal, the modulation signal output by the touch detection unit 104 meets the frequency requirement of touch detection.
The scanning line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105 in the driving circuit 100 are connected to the output end of the modulation unit 1012, so that the oscillation signal is superimposed on the signals output by the scanning line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105, and a modulation signal is obtained by modulating the output signals.
In order to make the operation principle of the modulation unit 1012 clearer, in the present embodiment, the basic signal is taken as the ground signal GND for example.
With combined reference to fig. 2 and fig. 3, the input terminal of the modulation unit 1012 is an input ground terminal, and the received basic signal is a ground signal GND; the output end is an output ground end, and the output oscillation signal is an oscillation signal MGND generated based on the ground signal GND and the driving voltage.
The scan line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105 are connected to an output ground, and modulate an output signal based on the oscillation signal MGND to output a modulated signal (corresponding to a modulated scan signal, a modulated pixel voltage signal, a modulated touch driving signal, and a common voltage, respectively).
Referring to fig. 4 in combination, the signals output by the units in fig. 3 are enlarged.
The first phase W1 is a charging phase of the pixel P started under the driving of the first scan signal S1, and the second phase W2 is a touch detection phase started under the control of the touch trigger signal TP.
In the first stage W1, the signal output by the modulation unit 1012 is a ground signal GND, and the scan line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105 respectively provide a scan driving signal, a pixel voltage signal, and a touch driving signal to the touch display panel 10 corresponding to the ground signal GND, which is maintained in a stable state of the first reference signal 0V.
In the second stage W2, under the control of the touch trigger signal TP, the modulation unit 1012 starts generating the oscillation signal MGND. In this embodiment, the voltage provided by the voltage generating unit 1013 is the second reference signal 1.8V, the ground signal received by the input ground terminal is the first reference signal 0V, and accordingly, the oscillation signal at the output terminal of the modulating unit 1012 is the oscillation signal MGND alternately changed between 0V and 1.8V. In this embodiment, the output terminal of the modulation unit 1012 is an output ground terminal.
It should be noted that the reference voltages of 0V and 1.8V are only an example, and in other embodiments, the corresponding amplitude may be adjusted according to the product condition.
The scanning line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105 are connected to an output ground terminal of the modulation unit 1012, and when the modulation unit 1012 starts generating an oscillation signal MGND, the oscillation signal MGND modulates output signals of the scanning line driving unit 102, the data line driving unit 103, the touch detection unit 104, and the common voltage generation circuit 105 to form a modulation signal. Modulation here means that the modulated signal rises with the rising of the oscillation signal and falls with the falling in synchronization with the frequency and phase of the oscillation signal.
Specifically, the first scan signal S1 and the second scan signal S2 output by the scan line driving unit 102 at the stage W2 both start oscillating with MGND; the data line driving unit 103 applies the pixel voltage Vn to the pixel electrode 202 at the stage W2, which is also a modulation signal based on the oscillation signal MGND. Accordingly, the common voltage applied to the common electrode 203 is also changed from Vc1 at the stage of W1 to modulated Vc 2.
In the stage W2, the common voltage Vc2 on the common electrode 203 is a signal output by the common voltage generating circuit 105, and the touch driving signal on the common electrode 203 is a signal output by the touch detection unit 104, where the touch driving signal is the same as the common voltage Vc2, and the pixel voltage Vn loaded on the pixel electrode 202 is a signal superimposed by the oscillation signal MGND through capacitive coupling, so that the touch display panel 10 is a signal modulated by the oscillation signal MGND.
It should be noted that, when performing touch detection, the touch detection unit 104 may drive the common electrode by rows to perform touch detection, and accordingly, at the same time, part of the common electrode 203 is electrically connected to the touch detection unit 104 through the data selection unit 106, and part of the common electrode 203 is electrically connected to the common voltage generation circuit 105 through the data selection unit 106. However, alternatively, the touch detection unit 104 may also drive all the common electrodes 203 to perform touch detection simultaneously, and for this embodiment, the common voltage generation circuit 105 does not need to provide the common voltage to the common electrodes 203 during touch detection.
When the oscillation signal MGND outputs the first reference signal 0V, the Vc1, Vn are still at the original voltage values, and when the oscillation signal MGND outputs the second reference signal 1.8V, the common voltage is increased by 1.8V to become Vc2, and the pixel voltage Vn is also increased by 1.8V, so that the voltage between the common electrode 203 and the pixel electrode 202 remains unchanged and is still a gray scale voltage, so that forming the modulation signal based on the oscillation signal MGND does not affect the display of the pixel 20 in the W2 stage. In the whole process, the signal output by the touch detection unit 104 to the common electrode 203 is used for the touch driving signal of the common electrode 203 on one hand and also used for performing image display on the other hand, and the clamping pressure between the common electrode and the pixel electrode 202 is maintained.
Accordingly, at the stage W2, the scanning line driving unit 102 outputs to the scanning line G 1 、G 2 ……G N The above signals are modulated scanning signals, and the data line driving unit 103 outputs the modulated scanning signals to the data lines S 1 、S 2 ……S N The signals output to the common electrode 203 by the common voltage generating circuit 105 are modulated common voltage signals, and the signals output to the common electrode 203 by the touch detection unit 104 are modulated touch driving signals. Optionally, the touch driving signal output by the touch detection unit 104 is, for example, a constant voltage signal modulated by the oscillation signal MGND.
With reference to fig. 2, optionally, a ground line L1 is formed on the touch display panel 10, the ground line L1 is connected to the output ground of the modulation unit 1012, and in the stage W1, the modulation unit 1012 outputs a ground signal GND to the ground line L1. And at the stage W2, the modulation unit 1012 directly outputs the oscillation signal MGND to the ground line L1. It should be noted that the ground line L1 in fig. 2 is a small segment, which is only an example, and it may also be a circle or a half circle, etc., and the present application does not limit this.
Therefore, the driving circuit 100 can make the signals on the touch display panel 10 all be signals that change with the change of the oscillation signal MGND at the stage W2 by coupling the oscillation signal MGND and the oscillation signal MGND, directly outputting the oscillation signal MGND, or the like, or a combination thereof. Compared with the touch driving signal only loaded with alternating current on the common electrode 203, the change of the pressure difference between the conductors of the touch display panel 10 is small, so that the charge and discharge electric quantity of the parasitic capacitance at the touch detection stage is reduced, and the signal-to-noise ratio of the touch detection is improved.
In this embodiment, the modulation unit 1012 includes two input terminals, one of which receives a first reference signal, i.e., a ground signal, and the other of which receives a second reference signal provided by the voltage generation circuit. The principle of generating the oscillation signal by the modulation unit 1012 will be described with reference to the circuit diagram of the modulation unit 1012 shown in fig. 5.
The modulation unit 1012 includes the first active switch 211 and the second active switch 213. The first active switch 211 includes a control terminal K1, a first transmission terminal T1, and a second transmission terminal T2, and the second active switch 213 includes a control terminal K2, a first transmission terminal T3, and a second transmission terminal T4. The control ends K1 and K2 are both connected with the controller 215. The second terminal T2 of the first active switch 211 is connected to the first terminal T3 of the second active switch 213 and defines an output node N on the connection line, the first terminal T1 of the first active switch 211 receives a first reference signal, the second terminal T4 of the second active switch 213 receives a second reference signal, and the controller 215 controls the output node N to alternately output the first reference signal and the second reference signal by controlling the first and second active switches 211, 213, so as to form the oscillation signal MGND.
In this embodiment, the first reference signal is a ground signal GND, and the second reference signal provides a driving voltage for the voltage generating circuit 1013. Accordingly, the second terminal T4 is connected to the voltage generating circuit 1013, the first terminal T1 is an input terminal for receiving a ground signal GND, and the node N is an output terminal for outputting the oscillation signal MGND.
The first active switch 211 and the second active switch 213 are suitable types of switches such as thin film transistors, triodes, metal oxide semiconductor field effect transistors, and the like.
The triggering unit 1011 is connected to the controller 215, and the operation of the modulating unit 1012 includes: in the first phase W1, the touch trigger signal TP sent by the trigger unit 1011 is at a low level, and the controller 215 controls the output of the ground signal GND based on the low level; in the second phase W2, the touch trigger signal TP sent by the trigger unit 1011 is at a high level, and the controller 215 generates the oscillation signal MGND based on the high level control, and then outputs the oscillation signal MGND through the output terminal.
It should be noted that, in the modulating unit 1012 of this embodiment, the basic signal received by the input terminal is a ground signal, and the modulating unit 1012 is an oscillation signal formed by the ground signal. The control unit 101 is further configured to receive a voltage source signal and a reference voltage signal. Accordingly, in other embodiments, the basic signal may also be one or more of a voltage source signal or a reference voltage signal, that is, the modulation unit 1012 may combine the driving voltage of the voltage generation circuit with different signal sources to form an oscillating signal that two reference voltages output alternately.
It should be noted that the driving circuit 100 includes various functional units, such as a scan line driving unit 102 for providing scan signals to the touch display panel 10, a data line driving unit 103 for providing pixel voltages to the touch display panel 10, a touch detection unit 104 for providing touch driving signals to the touch display panel 10, and a common voltage generating circuit 105 for providing common voltages to the touch display panel 10, and some functional units are for providing signals to other functional units and are defined as source end units (not shown), or some functional units are for processing signals fed back from the touch display panel 10 and are defined as feedback units (not shown, for example, as calculating units for calculating and comparing representative capacitance data fed back by touch detection). These circuits, like the source side unit or the feedback unit, receive for example still the ground signal GND in the phase W2. That is, in the stage W2, two domains are included on the driving circuit 100: a first reference domain (the control unit 101, the source end unit and the feedback unit) based on the ground signal GND, and a second reference domain (including the scan line driving unit 102, the data line driving unit 103, the touch detection unit 104 and the common voltage generation circuit 105) based on the oscillation signal MGND.
The first reference domain and the second reference domain are both based on GND at the stage W1, and do not need level conversion, and in the stage W2, because MGND raises the reference voltage of the second reference domain, while the voltage of the first reference domain remains unchanged, therefore, in the stage W2, a voltage difference exists between the two reference domains, and for some functional units, level conversion is needed. Alternatively, it is possible to control whether the level of the corresponding signal is converted in the first period W1 and the second period W2 by providing a level conversion unit (not shown). Specifically, the level conversion unit may be realized by providing a switching element.
In addition, since the reference voltages of the two reference domains are different, the current in the second reference domain, in which the reference voltage is raised, has the possibility of flowing back to the first reference domain during the phase W2, and in order to prevent this, a protection circuit (not shown) may be further included, the protection circuit being disposed between the first reference domain and the second reference domain and preventing the current from flowing from the second reference domain to the first reference domain. In particular, the protection circuit may be a diode that conducts unidirectionally.
Referring to fig. 6, a functional block diagram of a touch display device according to another embodiment of the present application is shown. The same or similar parts of the touch display device 3 of the present embodiment and the touch display device 1 of the embodiment shown in fig. 2 are not repeated, and the touch display device 3 of the present embodiment is different from the touch display device 1 of the previous embodiment in that:
the control unit 301 is configured to control the data line driving unit 303 to enable the data line to be in a high impedance state within a first preset time when the first scanning signal S1 drives the scanning line; and within the first preset time, controlling the touch display panel 30 to perform touch detection based on the oscillation signal.
By making the data line S 1 、S 2 ……S N In the high impedance state, it can also be ensured that the data line S is in the process of performing the touch detection by the touch detection unit 304 within the first preset time 1 、S 2 ……S N The signal is kept stable relative to the oscillation signal, interference is not generated in the touch detection process, and therefore the excellent detection environment is guaranteed in the touch detection process.
Specifically, as shown in fig. 6, a switch K is disposed between the data line driving unit 303 and the data line for being in an off state within a first preset time when the first scan signal S1 starts to drive the scan line, so as to enable the data line S to be in an off state 1 、S 2 ……S N The high resistance state is maintained. Thus, even if the data line driving unit 303 is still supplying the display data, the display data is not loaded on the data line S 1 、S 2 ……S N In the above, the display data is not loaded on the pixel electrode 402, so that the voltage on the data line and the pixel voltage on the pixel electrode 402 are neutralized, and the interference of excessive electric signals is not generated, and the touch detection is performed in this period of time, so that the noise interference is not generated.
Within the first preset time, the modulation unit 3012 may output the oscillation signal MGND, so that the signal on the touch display panel 10 may be a signal varying synchronously with the oscillation signal MGND, and although the data line maintains a high impedance state, accordingly, the pixel voltage is not loaded on the pixel electrode 402. However, the scanning signal is a modulation signal modulated by the oscillation signal MGND, and the modulation signal modulated by the oscillation signal MGND is also loaded on the common electrode 403. Based on the reason of capacitive coupling, the modulation signal can be further superimposed on conductors such as the data line and the pixel electrode 402, so that the charging and discharging electric quantity of parasitic capacitance between the conductors can be reduced, and the signal-to-noise ratio of touch detection can be improved.
The switch K is further configured to be in a conducting state after a first preset time when the first scan signal S1 starts to drive the scan line, so as to enable the data line driving unit 303 and the data line S 1 、S 2 ……S N In the electrically connected state, the display data provided by the data line driving unit 303 passes through the data line S 1 、S 2 ……S N May be loaded on the pixel electrode 402 to charge the pixel point 40 for displaying an image.
The control unit 301 is configured to control the data line driving unit 303 to charge the activated pixel 40 for at least the second duration a2 after touch detection, and the time for the touch detection unit 304 to perform touch detection is touch time; the first duration is greater than a1 or equal to the sum of the second duration a2 and touch time.
In other embodiments, the data line may be in the high-impedance state within the first preset time when the first scan signal S1 starts to drive the scan line in other manners.
Optionally, the switch K may also be integrated on the touch display panel 30, or may also be integrated in a chip.
It should be noted that, in addition to the manner of keeping the data line in the high impedance state, the current pixel voltage (i.e., the pixel voltage applied to the pixel electrode 402 in the previous row) may be kept in the first preset time, that is, the switch K is in the on state, so that the voltage on the data line is kept unchanged, the pixel electrode 402 is charged to the current pixel voltage, and the signal interference between the pixel charging and the touch detection may also be reduced to a certain extent. In the first preset time, when the modulation unit 3012 generates an oscillation signal, the current pixel voltage output by the data line driving unit 303 is also modulated into a modulation signal, and the modulation signals are loaded on the pixel electrode 402 and the common electrode 403. After the first preset time, after the touch detection is completed, the pixel electrode 402 is charged to update the voltage on the pixel electrode 402 to the pixel voltage required for actual display.
For example, but not limited thereto, the technical solutions in the embodiments are mainly applicable to a touch display panel adopting a dual gate mode or a touch display panel adopting a MUX1:3, 1:6 mode, and the like. The touch display panel has fewer data lines and more scanning lines, and normal display is completed by time-sharing multiplexing of the data lines. Therefore, for the touch display panel adopting the dual gate mode or the MUX1:3 and 1:6 modes, the scanning time on the scanning line is less, such as but not limited to about 4 microseconds or about 5 microseconds.
For the touch display panel adopting the dual gate mode, the touch display panel can be, for example, a touch display panel of amorphous silicon or low temperature polysilicon.
For the touch display panel adopting the MUX1:3, 1:6, etc., it can be a low temperature polysilicon touch display panel, for example.
For the touch display panel of the single gate mode, it may be, for example, a touch display panel of amorphous silicon.
However, the technical solutions in the embodiments may be applied to a touch display panel in a single gate mode.
Referring to fig. 7 to 9, fig. 7 is a schematic structural diagram of a touch display panel adopting a single-gate mode according to an embodiment of the present disclosure. Fig. 8 is a schematic structural diagram of a touch display panel adopting a dual gate mode according to an embodiment of the present application. Fig. 9 is a schematic structural diagram of a touch display panel employing a MUX1:3 mode according to an embodiment of the present invention. Generally, the touch display panel includes a plurality of pixel units M, and each pixel unit M at least includes pixel points P of three colors, i.e., R (red), G (green), and B (blue). The pixel points with different colors are used for emitting visible light with different colors. Alternatively, in other embodiments, the pixel unit M may further include a pixel point P of W (white) for emitting white visible light.
In the touch display panel of the embodiment of fig. 7, the pixel points 20 of different colors in the same pixel unit M are connected to the same scan line, and the pixel points P of different colors are connected to different data lines. Thus, when one scanning line is activated, each pixel point P in the same pixel unit M is driven.
In the touch display panel of the embodiment of fig. 8, the pixel points P of two colors in the same pixel unit M are connected to the same scan line, the pixel point P of another color is connected to another scan line, the pixel points P of two colors are connected to the same data line, and the pixel point P of another color is connected to another data line. For example, taking a pixel unit M as an example, the R, B pixel points P of two colors are connected to the same scan line, the G pixel point P is connected to the other scan line, the R and G pixel points P are connected to the same data line, and the B pixel point P is connected to the other data line. For different pixel units M, the connection relationship between the pixel point P and the scan line and the data line is not completely the same. Fig. 8 is only an example, however, the connection relationship or the arrangement relationship between the sub-pixel points P of each color and the scan lines and the data lines may be in other suitable manners. This is not a limitation of the present application.
When each pixel point P in the same pixel unit M needs to be driven, two scanning lines connected to the same pixel unit M need to be driven in sequence, so that the driving of the same pixel unit M can be completed.
In the touch display panel of the embodiment of fig. 9, 1 pixel unit M shares the same data line, and the pixel point P of each color is connected to one scan line respectively.
When each pixel point P in the same pixel unit M needs to be driven, three scanning lines connected to the same pixel unit M need to be sequentially driven, so that the driving of the same pixel unit M can be completed.
As can be seen from the comparison, for the touch display panels in fig. 7 to 9, because the pixel points P of different colors in the same pixel unit M are to multiplex the same data line in a time-sharing manner, when one pixel unit M is scanned, the time for activating each scan line in fig. 7 may be longer than the time for activating the scan lines in fig. 8 and 9, and the time for activating each scan line in fig. 8 may be longer than the time for activating the scan lines in fig. 9.
For example, the structures of the touch display panels in fig. 8 to 9 can be applied to the touch display panel 10 and the touch display panel 30, and accordingly, the pixel points P are the corresponding pixel points 20 and the corresponding pixel points 40.
Referring to fig. 10 to 12, fig. 10 is a functional block diagram of a touch display device according to another embodiment of the present application. Fig. 11 and 12 are schematic diagrams and enlarged diagrams of driving signals for implementing the touch display device shown in fig. 10.
It should be noted in advance that the technical solution of the present embodiment is mainly applicable to a touch display panel in a single gate mode. However, the present application is not limited thereto, and the technical solution of the present embodiment can also be applied to a touch display panel with other suitable structures.
The same or similar parts of the touch display device 5 of the present embodiment and the touch display device 1 shown in fig. 2 of the previous embodiment are not repeated, and the following mainly describes the differences of the touch display device 5 of the present embodiment.
In an embodiment, the control unit 501 is used to control the scan line driving unit 502 to generate a plurality of identical scan signals S0, i.e., the duration of the first signal hold of each scan signal S0 is the same. The first signal duration of the scan signal is a first duration, and the first duration is greater than or equal to the sum of the charging time and the touch time, so that the pixel charging and touch detection processes can be performed in each scan signal S0.
For example, the charging time of the pixel 60 is 5 microseconds, and the touch detection time is 5 microseconds. The duration of the scan signal S0 is 10 microseconds, when the scan signal S0 drives the scan line, the data line driving unit 503 charges the pixel 60 within the preceding 5 microseconds, the charging is completed after 5 microseconds, and the touch detection unit 504 performs touch detection within the following 5 microseconds of the scan signal S0.
Accordingly, when each row scanning signal S0 is driven, pixel charging at the W1 stage and touch detection at the W2 stage are performed first, and at the W2 stage, the modulation unit 5012 outputs an oscillation signal, so that signals output by the scanning line driving unit 502, the data line driving unit 503, the touch detection unit 504, and the common voltage generation circuit 505 are all modulation signals modulated by the oscillation signal (only one cycle is illustrated in fig. 12 for simplicity), and thus the modulation signals or the oscillation signals superimposed due to capacitive coupling are loaded on conductors such as the scanning lines, the data lines, the pixel electrodes 602, and the common electrodes 603, and the signals on the touch display panel 50 change with the change of the oscillation signal, thereby reducing the charging and discharging electric quantity of parasitic capacitance and improving the signal-to-noise ratio of touch detection.
Similarly, when the first signal of each scan signal S0 is a longer first duration, the image display refresh may be performed after the touch detection under the control of each scan signal S0. During the touch detection process, an oscillation signal is generated, and the signal on the touch display panel 60 changes along with the change of the oscillation signal. For example, the signal on the touch display panel 60 increases with the increase of the oscillation signal and decreases with the decrease of the oscillation signal. Optionally, the signal on the touch display panel 60 changes synchronously with the change of the oscillation signal.
For example, the structure of the touch display panel in fig. 7 can be applied to the touch display panel 50, and accordingly, the pixel point P is the corresponding pixel point 60.
In the embodiments of fig. 6 to 12, the method for generating the oscillation signal by the control unit and synchronously changing the signal on the touch display panel by the oscillation signal are the same as those of the embodiments shown in fig. 1 to 5, and are not repeated herein.
The touch display devices 1, 3, and 5 of the embodiments in the application improve the utilization rate of the display time, increase the refresh frame rate, reduce the charge and discharge electric quantity of the parasitic capacitance on the touch display panels 10, 30, and 50, and improve the detection signal-to-noise ratio of the touch detection.
Referring to fig. 13, fig. 13 is a functional block diagram of an electronic device according to an embodiment of the present application. The electronic device 1000 includes a touch display device 1001. The touch display device 1001 may be any one of the touch display devices 1, 3, and 5 described in the above embodiments.
The electronic device 1000 may be a mobile phone, a tablet computer, or other human-computer interaction device.
Since the touch display devices 1, 3, and 5 have the advantages of high image display refresh frame rate and high signal-to-noise ratio during touch detection, the electronic apparatus 1000 also has these advantages.
Although the present application is disclosed above, the present application 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 disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.

Claims (10)

1. A driving circuit, configured to drive a touch display panel to achieve image display and touch detection, the touch display panel comprising: the scanning line, the data line and a plurality of pixel points are arranged in rows, and the pixel points are positioned at the junction between the scanning line and the data line;
wherein the drive circuit includes:
a scanning line driving unit for activating a pixel point connected to the scanning line;
a data line driving unit for supplying a pixel voltage to the activated pixel point through a data line;
the touch detection unit is used for performing touch detection on the touch display panel;
the control unit is used for controlling the touch detection unit to perform touch detection based on an oscillation signal when the scanning line driving unit activates the pixel point, and is also used for controlling the data line driving unit to provide pixel voltage for the activated pixel point after the touch detection;
the control unit generates the oscillation signal when performing touch detection, so that the signal on the touch display panel is a signal which changes along with the change of the oscillation signal.
2. The drive circuit according to claim 1, wherein the scan line drive unit is configured to generate a scan signal including a first signal and a second signal, the first signal being different from the second signal, and wherein for a scan line: when the scanning line driving unit provides a first signal to the scanning line, the pixel point connected with the scanning line is activated, and when the scanning line driving unit provides a second signal to the scanning line, the pixel point connected with the scanning line is closed.
3. The drive circuit according to claim 2, wherein the control unit includes: the trigger unit is used for controlling the scanning line driving unit to generate a first scanning signal and a second scanning signal which have different first signal duration, wherein the first signal duration of the first scanning signal is a first duration, the first signal duration of the second scanning signal is a second duration, and the first duration is longer than the second duration;
the control unit is used for controlling the touch detection unit to perform touch detection based on the oscillation signal when the scanning line driving unit provides the first scanning signal to the scanning line to activate the pixel point; and the data line driving unit is also used for controlling the data line driving unit to charge the activated pixel points after touch detection.
4. The driving circuit according to claim 3, wherein the control unit is configured to control the data line driving unit to charge the activated pixel for at least the second duration after the touch detection, and the time for the touch detection unit to perform the touch detection is a touch time; the first duration is greater than or equal to the sum of the second duration and the touch time.
5. The drive circuit according to claim 3, wherein the scan signals generated by the scan line drive unit to realize image display of one frame include a plurality of scan signal groups, one scan signal group including: a first scanning signal and at least a second scanning signal.
6. The driving circuit according to claim 5, wherein the control unit is configured to control the data line driving unit to maintain the current pixel voltage or to make the data line in a high impedance state within a first preset time when the first scan signal drives the scan line; controlling the touch display panel to perform touch detection based on the oscillation signal within the first preset time;
the control unit is further configured to control the data line driving unit to charge the pixel point after a first preset time when the first scan signal starts to drive the scan line.
7. The driving circuit according to claim 6, wherein a switch is disposed between the data line driving unit and the data line, and the control unit is configured to control the switch to be in an off state within a first preset time when a first scan signal starts to drive the scan line, so that the data line is in a high impedance state; and the control circuit is also used for controlling the switch to be in a conducting state after a first preset time when the first scanning signal starts to drive the scanning line so as to provide the pixel voltage for the data line.
8. The driving circuit according to any of claims 1 to 7, wherein the control unit is configured to modulate a signal output by the driving circuit to the touch display panel by the oscillation signal to obtain a modulated signal during the touch detection; or the touch display panel superposes the oscillation signal due to capacitive coupling.
9. The driving circuit according to claim 8, wherein the pixel point includes a pixel electrode and a common electrode, the data line driving unit is configured to provide a pixel voltage to the pixel electrode for performing image display, the driving circuit further includes a common voltage generating circuit configured to provide a common voltage to the common electrode for performing image display, and the touch detection unit is configured to provide a touch driving signal to the common electrode for performing touch detection.
10. A touch display device, comprising: a driver circuit as claimed in any one of claims 1 to 9.
CN202210398970.6A 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment Withdrawn CN114967968A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN2020116352345 2020-12-31
CN202011635234 2020-12-31
CN202110056120.3A CN112711352A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN202110056120.3A Division CN112711352A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment

Publications (1)

Publication Number Publication Date
CN114967968A true CN114967968A (en) 2022-08-30

Family

ID=75549164

Family Applications (15)

Application Number Title Priority Date Filing Date
CN202110057828.0A Withdrawn CN112799535A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202110056120.3A Withdrawn CN112711352A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110057831.2A Withdrawn CN112799536A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202110056117.1A Withdrawn CN112799534A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202210414040.5A Withdrawn CN114895805A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202110057778.6A Pending CN112711353A (en) 2020-12-31 2021-01-15 Touch display device and electronic equipment
CN202210413922.XA Withdrawn CN114895804A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110056093.XA Withdrawn CN112860100A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202210398970.6A Withdrawn CN114967968A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110057824.2A Withdrawn CN112860101A (en) 2020-12-31 2021-01-15 Touch display device and electronic equipment
CN202210399001.2A Withdrawn CN114967969A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110057832.7A Withdrawn CN112860102A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202210399003.1A Withdrawn CN114967970A (en) 2020-12-31 2021-01-15 Liquid crystal display device capable of improving detection signal-to-noise ratio and electronic equipment
CN202210398984.8A Withdrawn CN114995678A (en) 2020-12-31 2021-01-15 Liquid crystal display device and related electronic equipment
CN202210398983.3A Withdrawn CN114995677A (en) 2020-12-31 2021-01-15 Touch display device and related electronic equipment

Family Applications Before (8)

Application Number Title Priority Date Filing Date
CN202110057828.0A Withdrawn CN112799535A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202110056120.3A Withdrawn CN112711352A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110057831.2A Withdrawn CN112799536A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202110056117.1A Withdrawn CN112799534A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202210414040.5A Withdrawn CN114895805A (en) 2020-12-31 2021-01-15 Liquid crystal display device and electronic apparatus
CN202110057778.6A Pending CN112711353A (en) 2020-12-31 2021-01-15 Touch display device and electronic equipment
CN202210413922.XA Withdrawn CN114895804A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110056093.XA Withdrawn CN112860100A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment

Family Applications After (6)

Application Number Title Priority Date Filing Date
CN202110057824.2A Withdrawn CN112860101A (en) 2020-12-31 2021-01-15 Touch display device and electronic equipment
CN202210399001.2A Withdrawn CN114967969A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202110057832.7A Withdrawn CN112860102A (en) 2020-12-31 2021-01-15 Drive circuit, touch display device and electronic equipment
CN202210399003.1A Withdrawn CN114967970A (en) 2020-12-31 2021-01-15 Liquid crystal display device capable of improving detection signal-to-noise ratio and electronic equipment
CN202210398984.8A Withdrawn CN114995678A (en) 2020-12-31 2021-01-15 Liquid crystal display device and related electronic equipment
CN202210398983.3A Withdrawn CN114995677A (en) 2020-12-31 2021-01-15 Touch display device and related electronic equipment

Country Status (1)

Country Link
CN (15) CN112799535A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113467640B (en) * 2021-06-30 2023-09-08 厦门天马微电子有限公司 Driving method and driving circuit of touch display panel and touch display device
CN116052578B (en) * 2023-03-31 2023-08-04 深圳曦华科技有限公司 Method and device for synchronously controlling chip input and output in display chip system

Also Published As

Publication number Publication date
CN112799536A (en) 2021-05-14
CN112860102A (en) 2021-05-28
CN112711353A (en) 2021-04-27
CN114967970A (en) 2022-08-30
CN112799534A (en) 2021-05-14
CN114895805A (en) 2022-08-12
CN114995678A (en) 2022-09-02
CN114895804A (en) 2022-08-12
CN112799535A (en) 2021-05-14
CN112860100A (en) 2021-05-28
CN114967969A (en) 2022-08-30
CN112711352A (en) 2021-04-27
CN112860101A (en) 2021-05-28
CN114995677A (en) 2022-09-02

Similar Documents

Publication Publication Date Title
CN105335009B (en) Touch display device and electronic equipment
CN106557194B (en) Driver IC and display equipment including the driver IC
CN105353919B (en) Driving circuit of touch display device
CN114967968A (en) Drive circuit, touch display device and electronic equipment
CN214504392U (en) Touch display device and electronic equipment
KR20160046965A (en) Display device
CN212364973U (en) Drive circuit, touch display device, and electronic apparatus
CN107885374B (en) Driving circuit
CN107885368B (en) Touch display device and electronic apparatus
CN102376284A (en) Electro-optic device and electronic apparatus
CN109920384B (en) Drive chip, touch display device, and electronic apparatus
CN107888756B (en) Mobile phone
US10248235B2 (en) Display apparatus
CN103105712A (en) Display module and liquid crystal display
CN112732106A (en) Drive circuit, touch display device, and electronic apparatus
CN107885367B (en) Touch display device and electronic apparatus
CN212364974U (en) Drive circuit, touch display device, and electronic apparatus
CN209803751U (en) Electronic device
CN107886908B (en) Touch display device and electronic apparatus
CN107885373B (en) Touch display device and electronic apparatus
CN107885365B (en) Touch display device and electronic apparatus
CN107885366B (en) Touch display device and electronic apparatus
CN112732126A (en) Drive circuit, touch display device, and electronic apparatus
CN107885376B (en) Driving circuit
CN107885370B (en) Touch display device and electronic apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20220830