Touch display device and electronic device

Abstract

The present application provides a touch display device and an electronic device. The driving circuit includes a control unit, a scan line driving unit, a data line driving unit, and a touch detection unit. When the scan line driving unit activates a pixel, the control unit controls the touch detection unit to perform touch detection based on an oscillation signal, and is further configured to control the data line driving unit to provide a pixel voltage to the activated pixel 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 that changes with the oscillation signal. The electronic device includes the touch display device.

Description

Technical Field

[0001] The present application relates to the technical field of touch display, and particularly to a touch display device and an electronic device. Background Art

[0002] Smart terminals (such as mobile phones) are increasingly developing towards the trends of being thinner, lighter, and having full screens. To meet the requirements of such trends, In cell technology has gradually become the mainstream technology for display and touch. In In cell technology, the common electrode in the LCD display screen is also reused as a self-capacitance sensing electrode, so that the touch function can be realized while the image display is achieved.

[0003] When the common electrode is also used as a touch detection electrode, the prior art performs touch sensing on the touch sensing electrode in the row gap to reduce the interference between the image display data and the touch detection. However, as the resolution of the touch display device gradually increases, the row gap and the frame gap will be significantly compressed. Correspondingly, the time for touch detection is also compressed, which is likely to cause the problem of insufficient touch detection.

[0004] When performing touch detection during the process of image display refreshing, there are problems such as signal interference with each other and generation of large parasitic capacitances, which are likely to affect the signal-to-noise ratio of touch detection. Summary of the Invention

[0005] The problem solved by the embodiments of the present application is to provide a touch display device and an electronic device to improve the signal-to-noise ratio of detection.

[0006] To solve the above technical problem, the present application provides a touch display device, including a touch display panel and a driving circuit. The driving circuit is used to drive the touch display panel to achieve image display and touch detection. The touch display panel includes: scan lines arranged in rows, data lines arranged in columns, and a plurality of pixel points. The pixel points are located at the intersections between the scan lines and the data lines. The touch display panel includes a plurality of pixel units. Each pixel unit includes three of the pixel points, which are respectively used to emit red visible light, green visible light, and blue visible light. For the same pixel unit, at least two of the three pixel points are connected to the same scan line, and at least two pixel points are connected to the same data line; the driving circuit includes:

[0007] A scan line driving unit, configured to activate the pixel points connected to the scan lines;

[0008] A data line driving unit, configured to provide pixel voltages to the activated pixel points through the data lines;

[0009] A touch detection unit, configured to perform touch detection on the touch display panel;

[0010] A control unit, configured to control the touch detection unit to perform touch detection based on an oscillation signal when the scan line driving unit activates the pixel, and further configured to control the data line driving unit to provide a pixel voltage to the activated pixel after touch detection;

[0011] The control unit generates the oscillation signal during touch detection, so that the signals on the touch display panel are signals that change with the oscillation signal.

[0012] Optionally, the scan line driving unit is configured to generate scan signals, the scan signals include a first signal and a second signal, the first signal is different from the second signal. For a scan line: when the scan line driving unit provides the first signal to the scan line, the pixel connected to the scan line is activated; when the scan line driving unit provides the second signal to the scan line, the pixel connected to the scan line is turned off.

[0013] Optionally, the control unit includes: a trigger unit, configured to control the scan line driving unit to generate a first scan signal and a second scan signal with different durations of the first signal. The duration of the first signal of the first scan signal is a first time period, the duration of the first signal of the second scan signal is a second time period, and the first time period is greater than the second time period;

[0014] The control unit is configured to control the touch detection unit to perform touch detection based on the oscillation signal when the scan line driving unit provides the first scan signal to the scan line to activate the pixel; and is further configured to control the data line driving unit to charge the activated pixel after touch detection.

[0015] Optionally, the control unit is configured to control the data line driving unit to charge the activated pixel for at least the second time period after touch detection. The time for the touch detection unit to perform touch detection is the touch time; the first time period is greater than or equal to the sum of the second time period and the touch time.

[0016] Optionally, the scan signals for realizing the display of one frame of image generated by the scan line driving unit include a plurality of scan signal groups, and one scan signal group includes: one first scan signal and at least one second scan signal.

[0017] Optionally, the control unit is configured to control the data line driving unit to maintain the current pixel voltage or make the data line in a high impedance state within a first preset time when the first scan signal drives the scan line; and within the first preset time, control the touch display panel to perform touch detection based on the oscillation signal;

[0018] The control unit is further configured to control the data line driving unit to charge the pixel points after a first preset time when the first scan signal starts to drive the scan lines.

[0019] Optionally, a switch is disposed between the data line driving unit and the data line. The control unit is configured to control the switch to be in an off state within a first preset time when the first scan signal starts to drive the scan lines, so that the data line is in a high impedance state; and is further configured to control the switch to be in an on state after the first preset time when the first scan signal starts to drive the scan lines, so as to provide a pixel voltage to the data line.

[0020] Optionally, when performing touch detection, the control unit modulates the signal output from the driving circuit to the touch display panel through the oscillation signal to obtain a modulation signal; or causes the touch display panel to superimpose the oscillation signal due to capacitive coupling.

[0021] 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, and the common voltage generating circuit is configured to provide a common voltage to the common electrode to perform image display. The touch detection unit is configured to provide a touch driving signal to the common electrode to perform touch detection.

[0022] Optionally, the touch detection unit is configured to provide a touch driving signal to the same common electrode to simultaneously perform image display and self-capacitance touch detection.

[0023] Optionally, the driving circuit further includes a data selection unit. The touch detection unit and the common voltage generating 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 to output the common voltage to, and which common electrodes to output the touch driving signal to.

[0024] Optionally, when performing touch detection, the touch detection unit provides the touch driving signal to some of the common electrodes each time to perform self-capacitance touch sensing, and the common voltage generating circuit provides the common voltage to the remaining all or some of the common electrodes each time to perform image display, wherein the touch driving signal is the same as the common voltage.

[0025] Optionally, the signals provided by the scan line driving circuit to the scan lines, the signals provided by the data line driving circuit to the data lines, the signals provided by the touch detection unit to the common electrodes, and the signals provided by the common voltage generating circuit to the common electrodes are all modulation signals obtained after modulation of the oscillation signal.

[0026] Optionally, the driving circuit includes an output end, which is used as an output ground end. When the driving circuit drives the touch display panel to perform touch detection, the output end is used to output the oscillation signal. When the driving circuit drives the touch display panel to perform image display rather than touch sensing, the output end is used to output a ground signal.

[0027] Optionally, the scan line driving unit, the data line driving unit, the touch detection unit, and the common voltage generating circuit are connected to the output end.

[0028] Optionally, the signal on the touch display panel increases as the oscillation signal increases, and decreases as the oscillation signal decreases.

[0029] Optionally, the control unit generates an oscillation signal when performing touch detection, so that the signal on the touch display panel is a signal that changes synchronously with the change of the oscillation signal.

[0030] Optionally, for the same pixel unit, two pixel points are connected to the same scan line, another pixel point is connected to another adjacent scan line, and two pixel points are connected to the same data line, and another pixel point is connected to another adjacent data line; or, for the same pixel unit, each pixel point is connected to different adjacent scan lines and to the same data line.

[0031] Optionally, the control unit includes an output ground terminal, which is used to output a ground signal when charging the pixel point, and output an oscillation signal generated based on the ground signal during touch detection; a ground wire is also formed on the touch display panel and connected to the output ground terminal.

[0032] The present application also provides an electronic device, comprising any one of the touch display devices described above.

[0033] Compared with the prior art, the technical solution of this application has the following advantages:

[0034] In the embodiment of the present application, after the pixel point is activated, the touch detection and the action of providing the pixel voltage to the data line are performed in a time-sharing manner, and the touch detection is performed during the time after the pixel point is activated, thereby improving the utilization rate of the display time. In addition, the control unit of the driving circuit in the embodiment of the present application generates an oscillation signal when performing touch detection, so that the signal on the touch display panel is a signal that changes with the oscillation signal, thereby reducing the voltage difference change between the conductors such as the pixel electrode, common electrode, scanning line, and data line on the touch display panel, thereby reducing the charging and discharging amount of the parasitic capacitor and improving the detection signal-to-noise ratio of the touch detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a functional block diagram of a touch display device according to an embodiment of the present application;

[0036] Figure 2 is Figure 1 a functional block diagram of the control unit in

[0037] Figure 3 is Figure 1 a schematic diagram of the output signal of the driving circuit of the touch display device shown in

[0038] Figure 4 is Figure 1 a signal amplification diagram of the driving circuit of the touch display device shown in

[0039] Figure 5 is Figure 2 a circuit diagram of the modulation unit shown in

[0040] Figure 6 is a functional block diagram of a touch display device according to another embodiment of the present application;

[0041] Figure 7 is a schematic structural diagram of a touch display panel adopting a single gate mode according to an embodiment of the present application;

[0042] Figure 8 is a schematic structural diagram of a touch display panel adopting a dual gate mode according to an embodiment of the present application;

[0043] Figure 9 is a schematic structural diagram of a touch display panel adopting a MUX1:3 mode according to an embodiment of the present application;

[0044] Figure 10 is a functional block diagram of a touch display device according to still another embodiment of the present application;

[0045] Figure 11 is Figure 10 a schematic diagram of the output signal of the driving circuit of the touch display device shown in

[0046] Figure 12 is Figure 10 a signal amplification diagram of the driving circuit of the touch display device shown in

[0047] Figure 13 is a schematic structural diagram of an electronic device according to an embodiment of the present application. Detailed implementation manners

[0048] To make the above objects, features, and advantages of the present application more obvious and understandable, the following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0049] Touch display panel Touch display panel Touch display panel To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe in detail the specific embodiments of the present application with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments described herein; on the contrary, these embodiments are provided so that the present application will be comprehensive and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. For convenience or clarity, the thickness and size of each layer shown in the drawings may be exaggerated, omitted, or schematically shown, and the number of related components may be schematically shown. Additionally, the size of the components does not fully reflect the actual size, and the number of related components does not fully reflect the actual number. Due to reasons such as different drawing sizes, the number of the same, similar, or related components shown in different drawings is inconsistent. The same reference numerals in the drawings represent the same or similar structures. However, it should be noted that in order to make the reference numerals regular and logical, in some different embodiments, the same or similar components or structures use different reference numerals. Based on the technical relevance and related text descriptions, those skilled in the art can directly or indirectly judge and know.

[0050] In addition, the described features and structures can be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present application. However, those skilled in the art should realize that the technical solutions of the present application can also be practiced without one or more of the specific details, or by using other structures, components, etc. In other cases, well-known structures or operations are not shown or described in detail to avoid obscuring the present application.

[0051] Furthermore, the following terms are exemplary and are not intended to be limiting in any way. After reading the present application, those skilled in the art will recognize that these term expressions are applicable to technologies, methods, physical components, and systems (regardless of whether currently known), including those extended therefrom that can be inferred or are inferable by those skilled in the art after reading the present application.

[0052] In the description of the present application, it should be understood that: "a plurality of" includes two and more than two, "a plurality of strips" includes two and more than two strips, "a plurality of pieces" includes two and more than two pieces, "a plurality of rows" includes two and more than two rows, "a plurality of columns" includes two and more than two columns, unless otherwise specifically defined in the present application. Additionally, the words "first", "second", "third", "fourth" (if any) that appear in the names of each component and signal names do not limit the order in which the components or signals appear, but are for convenient component naming to clearly distinguish each component and make the description more concise and understandable.

[0053] Next, the embodiments of the present application will be described.

[0054] Combined reference Figures 1 to 3 , respectively showing a functional block diagram and a driving signal schematic diagram of a touch display device according to an embodiment of the present application. The touch display device 1 includes a touch display panel 10 and a driving circuit 100. The driving circuit 100 is used to drive the touch display panel 10 to perform image display and touch detection.

[0055] The touch display panel 10 generally includes: a first substrate (not shown in the figure) and a second substrate (not shown in the figure) disposed opposite to the first substrate. Scan lines G1, G2... GN arranged in rows and data lines S1, S2... S arranged in columns are formed on the first substrate. N , and pixel points 20 located at the intersections of the scan lines and the data lines. The pixel points 20 are used to receive display data from the driving circuit 100 for charging, so as to realize image display. The touch display panel 10 is, for example, a liquid crystal display (LCD) panel. Correspondingly, the touch display device 1 is a liquid crystal display device. However, alternatively, the touch display panel 10 may also be any suitable display panel such as an electronic paper display panel or an organic light-emitting diode display (OLED) panel.

[0056] A plurality of touch electrodes are further provided between the second substrate and the first substrate for realizing touch detection. The touch electrodes can be self-capacitance or mutual-capacitance touch electrodes.

[0057] In each embodiment of the present application, taking In cell as an example, a plurality of common electrodes 203 are formed between the second substrate and the first substrate. The common electrodes 203 are used to apply a common voltage during the display process to perform image display, and are also reused as touch electrodes for touch detection.

[0058] The driving circuit 100 is used to provide driving signals to the scan lines G1, G2... G N and provide display data to the data lines S1, S2... S N , and is also used to provide an AC excitation signal to the touch electrodes (i.e., the common electrodes 203), so as to realize image display and touch detection of the touch display panel 10.

[0059] Such as Figure 1As shown, the driving circuit 100 includes a control unit 101, a scan 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. Among them, the control unit 101 is respectively 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. 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.

[0060] The scan line driving unit 102 is connected to the scan lines G1, G2......G N , and is used to generate a scan signal. The scan signal includes a first signal and a second signal, and the first signal is different from the second signal. For a scan line (such as G1): when the scan line driving unit 102 provides the first signal to the scan line G1, the pixel 20 connected to the scan line G1 is activated; when the scan line driving unit 102 provides the second signal to the scan line G1, the pixel 20 connected to the scan line G1 is turned off. Optionally, part or all of the scan line driving unit 102 is integrated on the touch display panel 10, for example, by GIA (Gate In Array) technology. However, alternatively, part or all of the scan line driving unit 102 can also be integrated in a chip or be an independent circuit module, etc. are all possible. Or, part of the scan line driving unit 102 is integrated on the touch display panel 10, for example, by GIA (Gate In Array) technology, and part is integrated in a chip or is an independent circuit module, etc. are all possible.

[0061] 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 to say, when the scan signal is in the high-level state, the pixel 20 connected to the scan line G1 can be activated; when the scan signal is in the low-level state, the pixel 20 connected to the scan line G1 can be turned off and is in a non-charging state. However, alternatively, in some other embodiments, the first signal can also be a low-level signal, and the second signal is a high-level signal.

[0062] The pixel 20 includes a control switch 201 and a pixel electrode 202 connected to the control switch 201. The control switch 201 includes a control end, a first conduction end, and a second conduction end. The control end is used to control whether conduction occurs between the first conduction end and the second conduction end; the control end of the control switch 201 is connected to the scan lines G1, G2......G Nare connected, and the first conduction end is connected to the data lines S1, S2......S N are connected, and the second conduction end is connected to the pixel electrode 202.

[0063] Each pixel 20 further includes, for example, one of the common electrodes 203, or multiple pixels 20 share one common electrode 203, or a combination of the foregoing two. Optionally, the multiple common electrodes 203 are located on the same layer and are arranged regularly or irregularly. The present application does not limit the foregoing.

[0064] As used herein, the meaning of "activation" refers to that the first conduction end and the second conduction end of the control switch 201 are in a conducting state, and the data lines S1, S2......S N are electrically connected to the pixel electrode 202.

[0065] The meaning of "turn-off" refers to that the first conduction end and the second conduction end of the control switch 201 are in a non-conducting state, and the data lines S1, S2......S N are in a disconnected state from the pixel electrode 202.

[0066] The data line driving unit 103 is configured to, after activating the pixels 20 connected to the scan lines G1, G2......G N provide the display data of the current row to the data lines S1, S2......S N

[0067] Specifically, the display data provided by the data line driving unit 103 to the pixel electrode 202 is a pixel voltage.

[0068] When the data line driving unit 103 provides the display data, it charges the capacitor formed by the pixel electrode 202 and the common electrode 203, so that the voltage difference between the pixel electrode 202 and the common electrode 203 is a gray-scale voltage to implement image display.

[0069] The display data provided by the data line driving unit 103 to the data lines S1, S2......S N is used to charge the pixel 20. Define the time for the pixel electrode 202 of the pixel 20 or the data line connected to the pixel electrode 202 to be charged to reach the target voltage as the charging time. When the voltage on the pixel electrode 202 or the data line reaches the target voltage, the pixel 20 is fully charged. The target voltage is, for example, the same as or close to the pixel voltage.

[0070] ​Due to the adverse effects of parasitic inductance, parasitic resistance, parasitic capacitance, etc. that usually exist in the circuit loop, the target voltage and the pixel voltage are usually 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 when they are the same is a preset range. The preset 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, 4 us to 5 us. The above absolute value range of the voltage difference and the charging time range are only examples. According to the different pixel 20 arrangement structures or driving methods of the touch display device 1, the absolute value range of the voltage difference and the charging time range are correspondingly different. This application does not limit this.

[0071] The touch detection unit 104 is used to perform touch detection on the touch display panel 10. Specifically, for example, the touch detection unit 104 is used to provide a touch driving signal to the corresponding common electrode 203 to drive the common electrode 203 to perform touch detection.

[0072] The common voltage generation circuit 105 is used to provide a common voltage to the common electrode 203 to drive the common electrode 203 to perform image display.

[0073] The data selection unit 106 is used to select which common electrodes 203 to output the touch driving signal to, and which common electrodes 203 to output the common voltage to.

[0074] Specifically, the common electrode 203 is multiplexed as a touch detection electrode. The touch detection unit 104 is used to load an alternating current excitation signal as the touch driving signal to the common electrode 203, and touch detection is realized by detecting the change of the self-capacitance between the finger and the common electrode 203 (or the change of the mutual capacitance between the common electrodes 203 caused by the finger).

[0075] Define the time when the touch detection unit 104 performs touch detection on the common electrode 203 as the touch time. The touch time is, for example but not limited to, 4 us to 5 us.

[0076] It should be noted that the process of image display has relatively high requirements for resolution, while touch detection is mainly for the identification of the touch detection position, and it is not necessary to perform touch detection on the common electrodes 203 of each pixel 20 accurately. Therefore, in practical applications, according to the accuracy requirements of touch detection and the size of the resolution, it is possible to select to perform touch detection on some common electrodes 203 or all common electrodes 203.

[0077] 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 the oscillation signal after the charging of the pixel 20 with the display data is completed.

[0078] In this embodiment, after the control switch 201 is turned on under the drive of the scan signal, the pixel electrode 202 is first loaded with the pixel voltage for charging; after the charging is completed, an AC signal is loaded onto the common electrode 203 for touch detection. That is to say, the touch detection step is performed after the charging of the pixel voltage on the pixel electrode 202 of the pixel 20 is completed. After the pixel 20 is charged and during the touch detection process, the signals on the data line and the pixel electrode 202 remain stable relative to the oscillation signal MGND (see the following description), that is, there is basically no change relative to the oscillation signal MGND, and it is not easy to cause excessive noise interference to the touch detection process, thereby ensuring an ideal detection environment for the touch detection process. The embodiment of the present application effectively utilizes the activation time of the pixel 20 to perform image display refresh and touch detection, thereby improving the utilization rate of the display process time.

[0079] For each pixel 20, its image display state generally includes an image display refresh state and an image display hold state. Taking a single pixel 20 as an example, when the driving circuit 100 provides the pixel voltage to the pixel electrode 202 and provides the common voltage to the common electrode 203, the pixel 20 starts to perform image display refresh. After the pixel voltage is written to the pixel electrode 202, the control switch 201 of the pixel 20 is turned off, so as to stop providing the pixel voltage to the pixel electrode 202, and the image display refresh is completed. After that, the pixel 20 enters the image display hold state until the control switch 201 of the pixel 20 is turned on again to receive the pixel voltage.

[0080] Generally, the multiple pixels 20 are arranged in a matrix, for example. The driving circuit 100 usually drives the pixels 20 row by row to perform image display refresh.

[0081] Correspondingly, in order to be able to perform image display refresh and touch detection under the drive of a single scan signal, the duration of the scan signal in the first signal needs to be greater than or equal to the sum of the charging time and the touch time, so as to have enough time to perform the two steps of image display refresh and touch detection under the drive of a single scan signal.

[0082] Such as Figure 2As shown in the figure, in the driving circuit 100 of this embodiment, the control unit 101 includes a trigger unit 1011 and a modulation unit 1012. The trigger unit 1011 is respectively 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 used 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 work.

[0083] As Figure 3 shown in the signal diagram, the scan signals generated by the scan line driving unit 102 under the control of the trigger unit 1011 include a first scan signal S1 and a second scan signal S2. Among them, the duration of the first signal of the first scan signal S1 is a first duration a1, and the duration of the first signal of the second scan signal S2 is a second duration a2. The first duration 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 the first scan signal. The second duration a2 is less than the first duration a1 and greater than or equal to the charging time, so that pixel charging can be completed under the drive of the second scan signal.

[0084] It can be seen that in this embodiment, the touch display panel 10 first performs image display refresh under the control of the first scan signal S1, ( Figure 3 the working stage point filling square) Then, after the image display refresh reaches a predetermined time, touch detection is performed simultaneously ( Figure 3 the working stage blank square), that is, the touch detection stage and the image display refresh stage partially overlap, and only image display refresh is performed under the control of the second scan signal S2 ( Figure 3 the working stage point filling square). The predetermined time is greater than or equal to the charging time, but less than or equal to the sum of the first duration a1 and the touch time. Alternatively, the predetermined time may also be the same as or close to the second duration a2.

[0085] During the process of image display refresh, the data line driving unit 103 is used to provide the display data of the current row to the data lines S1, S2......S N to charge the pixel point 20, so that the voltage of the pixel point 20 changes from Vn-1 to the pixel voltage Vn (see Figure 4 ).

[0086] The trigger unit 1011 is used to further control the touch display panel 10 to perform touch detection when controlling the scan line driving unit 102 to output the first scan signal S1 and after the pixel point P is charged.

[0087] Specifically, after the scan line driving unit 102 outputs the first scan signal S1 for a second duration a2, the trigger unit 1011 outputs a touch trigger signal TP to the modulation unit 1012 to control the modulation unit 1012 to generate an oscillation signal. The trigger unit 1011 further outputs the touch driving signal to the corresponding common electrode 203 to perform touch detection by controlling the data selection unit 106. During the touch detection of the touch display panel 10, the electrical signals thereon change with the change of the oscillation signal.

[0088] 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. After 5 microseconds, the voltage on the pixel electrode 202 reaches the target voltage, and the charging is completed. The touch detection unit 104 performs touch detection in the next 5 microseconds after the first scan signal S1. The second duration a2 of the second scan signal S2 is, for example, 5 microseconds. When the second scan signal S2 drives the scan line, only the data line driving unit 103 charges the pixel 20, and the touch detection unit 104 does not perform touch detection. It should be noted that the above charging time and touch detection time are only examples, and the present application does not strictly limit this. Based on the technical idea of the present application, it should fall within the protection scope of the present application.

[0089] It should be noted that when we stipulate that the voltage on the pixel 20 is charged to the target voltage, we customize that the charging is completed. However, in the actual circuit, after the voltage on the pixel 20 reaches the target voltage, it may continue to be charged, but the charging is very slow and the voltage change is small.

[0090] In this embodiment, in order to implement the display of one frame of image, the scan signals generated by the scan line driving unit 102 include multiple scan signal groups. One scan signal group includes: a first scan signal S1 and at least one second scan signal S2, so as to ensure that touch detection is performed once in a group of scan signal groups.

[0091] In this way, the purpose of performing touch detection every few rows is achieved through the first scan signal S1, and thus the second scan signal S2 can be set shorter.

[0092] Such as Figure 3As shown in the figure, a group of scan signals includes: 4 second scan signals S2 output in sequence and 1 first scan signal S1. That is, a group of scan signals drives four scan lines through 4 second scan signals S2 to achieve image display refresh; then, 1 first scan signal S1 drives the scan lines to first perform image display refresh for a predetermined time and then perform touch detection simultaneously. Wherein, the predetermined time is greater than or equal to the charging time, or the predetermined time is the same as or close to the second duration a2.

[0093] It should be noted that based on the differences in image display resolution and touch detection accuracy, in this embodiment, touch detection is not performed every time a row of scan signals is generated, but every 4 rows of scan signals.

[0094] In other embodiments, different intervals can also be set, and a group of scan signals is output after several rows are separated (for example, a first scan signal S1 is output every 8 rows), and the time intervals between groups of scan signals are kept the same, for example. In this way, although the number of first scan signals S1 in a frame of image decreases and the corresponding number of touch detections decreases, it still meets the requirements of image display and touch detection.

[0095] Repeat the group of scan signals to drive all scan lines on the touch display panel 10, and then achieve the display of a frame of image.

[0096] Under the control of the first scan signal S1 and the second scan signal S2, the data line driving unit 103 charges the pixel 20. However, since the time when the first scan signal S1 and the second scan signal S2 turn on the control switch 201 is still different, the driving capabilities of the two scan signals are different.

[0097] The data line driving unit 103 can be compensated by undercharging technology or overcharging technology to ensure the display uniformity under the control of the first scan signal S1 and the second scan signal S2, and then ensure the influence effect during image display.

[0098] 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 overcharged or undercharged display data corresponding to the basic display data.

[0099] For example, when the original display result is undercharged, when the scan line driving unit 102 provides the first scan signal S1, the data line driving unit 103 provides display data that is greater than the basic display data voltage; when the original display result is overcharged, when the scan line driving unit 102 provides the first scan signal S1, the data line driving unit 103 provides display data that is smaller than the basic display data voltage.

[0100] In addition, the implementation of the undercharging technology or overcharging technology can also be achieved by adjusting the digital Gamma or analog Gamma.

[0101] 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 between high and low at a certain frequency. For example, a square wave signal, a rectangular wave signal, etc. are all types of oscillation signals.

[0102] In this embodiment, the oscillation signal is a square wave signal, including an alternately appearing first reference signal and a second reference signal. The voltage conditions of the first reference signal and the second reference signal can be any one of the following five situations:

[0103] First: The voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V;

[0104] Second: The voltage of the first reference signal is 0V, and the voltage of the second reference signal is a negative voltage;

[0105] Third: The voltage of the first reference signal is a positive voltage, and 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;

[0106] Fourth: The voltages of the first reference signal and the second reference signal are positive voltages with different magnitudes;

[0107] Fifth: The voltages of the first reference signal and the second reference signal are negative voltages with different magnitudes.

[0108] It should be noted that the oscillation signal can also be other suitable waveform signals. For example, a sine wave signal, a two-level step signal, etc. The oscillation signal is not limited to a periodically changing signal, and can also be a non-periodically changing signal.

[0109] In this application, through the oscillation signal, the electrical signal on the touch display panel 10 changes with the change of the oscillation signal. For example but not limited to, the signal on the touch display panel 10 increases as the oscillation signal increases and decreases as the oscillation signal decreases. Optionally, the electrical signal on the touch display panel 10 changes synchronously with the change of the oscillation signal. Compared with the traditional solution (the common electrode on the touch display panel is an AC signal, and the voltage on the pixel electrode is in a static holding state), in the embodiment of this application, by making the signals on conductors such as the pixel electrode 202, the common electrode 203, the scan line, and the data line change synchronously, the differential pressure change between the conductors can be reduced, thereby reducing the charge and discharge power of the parasitic capacitance, and further improving the detection signal-to-noise ratio of touch detection.

[0110] In addition, since both 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 signals that change synchronously with the oscillation signal, therefore, 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 can be the same voltage signal. Thus, while the touch driving signal drives the same common electrode 203 to perform touch sensing, it can also drive the same common electrode 203 to perform image display. Correspondingly, during the process of the driving circuit 100 driving the touch display panel 10 to perform image display refreshing, it can also drive the touch display panel 10 to perform touch sensing simultaneously. The mutual influence between the touch sensing and the image display refreshing is relatively small, and the user experience can be improved.

[0111] As Figure 2 shown, the control unit 101 further includes the modulation unit 1012, which is used to generate the oscillation signal during touch detection. The oscillation signal is used to modulate the signal output by the driving circuit 100 to the touch display panel 10 to obtain a modulation signal.

[0112] 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 at the rising edge of the touch trigger signal TP and stops generating the oscillation signal at the falling edge of the touch trigger signal TP. However, alternatively, the touch trigger signal TP can also be other suitable signals and is not limited to, for example Figure 3The rising edge and falling edge of the touch trigger signal TP shown are used to control the start time and end time of the oscillation signal generated by the modulation unit 1012. As long as the touch trigger signal TP can control the modulation unit 1012 to generate the oscillation signal in various implementation manners, they should all fall within the protection scope of this application. Additionally, in Figure 3 the embodiment, the touch trigger signal TP can also be a signal that changes with the change of the oscillation signal.

[0113] In the embodiment of this 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 the signals output 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 to the touch display panel 10, so that the signals output to the touch display panel 10 are all modulation signals obtained by modulating with the oscillation signal. The signals received on the touch display panel 10 are the modulation signals, which can change synchronously with the oscillation signal, for example, rising with the rising of the oscillation signal and falling with the falling of the oscillation signal. In addition, the modulation signal can also cause other conductors on the touch display panel 10 to superimpose the oscillation signal due to capacitive coupling.

[0114] Alternatively, the modulation unit 1012 can also directly output the oscillation signal to the touch display panel 10.

[0115] In this way, through various methods, the signals on the touch display panel 10 can all rise with the rising of the oscillation signal and fall with the falling of the oscillation signal, making the signals on each conductor on the touch display panel 10 in a synchronous change state, reducing the differential pressure change between the conductors, and further reducing the charge and discharge amount of the parasitic capacitance.

[0116] As Figure 2 shown, the control unit 101 further includes: an input end for receiving a base signal; a voltage generation unit 1013 for providing a driving voltage, and the driving voltage is the reference voltage of the oscillation signal; the modulation unit 1012 is connected to the input end and the voltage generation unit 1013, and generates the oscillation signal according to the base signal and the driving voltage under the control of the touch trigger signal TP; and outputs the base signal when the touch trigger signal TP is not received. Define the end where the modulation unit 1012 outputs the oscillation signal or the base signal as the output end.

[0117] Specifically, the modulation unit 1012 is an oscillation generating circuit, which forms an oscillation signal with alternating output of a first reference signal and a second reference signal according to the voltage generated by the voltage generating unit 1013 and the voltage provided at the input terminal as the first reference signal and the second reference signal respectively.

[0118] The oscillation frequency of the oscillation signal herein can 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 requirements for touch detection.

[0119] The scan line driving unit 102, data line driving unit 103, touch detection unit 104, and common voltage generating circuit 105 in the driving circuit 100 are connected to the output terminal of the modulation unit 1012, so as to superimpose the oscillation signal on the signals output by the scan line driving unit 102, data line driving unit 103, touch detection unit 104, and common voltage generating circuit 105, and obtain a modulation signal through modulation of the output signal.

[0120] To make the working principle of the modulation unit 1012 clearer, in this embodiment, the ground signal GND is taken as an example of the basic signal for illustration.

[0121] Combined with reference Figure 2 and Figure 3 , the input terminal of the modulation unit 1012 is an input ground terminal, and the received basic signal is the ground signal GND; the output terminal is an output ground terminal, and the output oscillation signal is an oscillation signal MGND generated based on the ground signal GND and the driving voltage.

[0122] The scan line driving unit 102, data line driving unit 103, the touch detection unit 104, and common voltage generating circuit 105 are connected to the output ground terminal, and after modulating the output signals based on the oscillation signal MGND, output modulation signals (corresponding to: the modulated scan signal, pixel voltage signal, touch driving signal, and common voltage respectively).

[0123] Combined with reference Figure 4 , Figure 3 The signal amplification diagrams of the signals output by each unit in

[0124] The first stage W1 is the pixel point P charging stage started under the drive of the first scan signal S1, and the second stage W2 is the touch detection stage started under the control of the touch trigger signal TP.

[0125] In the first stage W1, the signal output by the modulation unit 1012 is the ground signal GND. 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, and the ground signal GND is maintained in a stable state of the first reference signal 0V.

[0126] In the second stage W2, under the control of the touch trigger signal TP, the modulation unit 1012 starts to generate an oscillation signal MGND. In this embodiment, the voltage provided by the voltage generation unit 1013 is the second reference signal 1.8V, the ground signal received at the input ground terminal is the first reference signal 0V, and correspondingly, the oscillation signal at the output terminal of the modulation unit 1012 is the oscillation signal MGND that alternates between 0V and 1.8V. In this embodiment, the output terminal of the modulation unit 1012 is the output ground terminal.

[0127] It should be noted that the reference voltages of 0V and 1.8V here are only an example, and corresponding amplitude adjustments can be made according to the product situation in other embodiments.

[0128] 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 the output ground terminal of the modulation unit 1012. When the modulation unit 1012 starts to generate the oscillation signal MGND, the oscillation signal MGND modulates the output signals of the scan 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. The meaning of modulation here is that the modulated signal is synchronized with the frequency and phase of the oscillation signal, rising with the rise of the oscillation signal and falling with the fall of the oscillation signal.

[0129] Specifically, the first scan signal S1 and the second scan signal S2 output by the scan line driving unit 102 in the W2 stage both start to oscillate with MGND; the pixel voltage Vn loaded on the pixel electrode 202 by the data line driving unit 103 in the W2 stage is also a modulation signal based on the oscillation signal MGND. Correspondingly, the common voltage loaded on the common electrode 203 also changes from Vc1 in the W1 stage to the modulated Vc2.

[0130] It should be noted that in the W2 stage, the common voltage Vc2 on the common electrode 203 is the signal output by the common voltage generation circuit 105, and the touch driving signal on the common electrode 203 is the signal output by the touch detection unit 104. Among them, the touch driving signal is the same as the common voltage Vc2, and the pixel voltage Vn loaded on the pixel electrode 202 becomes the signal superimposed by the oscillation signal MGND through capacitive coupling. Therefore, all signals on the touch display panel 10 are signals modulated by the oscillation signal MGND.

[0131] It should be noted that when performing touch detection, the touch detection unit 104 can drive the common electrode row by row to perform touch detection. Correspondingly, at the same moment, some common electrodes 203 are electrically connected to the touch detection unit 104 through the data selection unit 106, and some common electrodes 203 are electrically connected to the common voltage generation circuit 105 through the data selection unit 106. However, alternatively, the touch detection unit 104 can also drive all common electrodes 203 to perform touch detection simultaneously. For this embodiment, during touch detection, the common voltage generation circuit 105 does not need to provide a common voltage to the common electrode 203.

[0132] When the oscillation signal MGND outputs the first reference signal 0V, the Vc1 and Vn are still the original voltage values. When the oscillation signal MGND outputs the second reference signal 1.8V, the common voltage increases by 1.8V to become Vc2, and the pixel voltage Vn also increases by 1.8V. Therefore, the clamping pressure between the common electrode 203 and the pixel electrode 202 remains unchanged and is still the grayscale voltage. So in the W2 stage, the modulation signal formed based on the oscillation signal MGND will not affect the display of the pixel 20. During the whole process, the signal output by the touch detection unit 104 to the common electrode 203 is used as the touch driving signal of the common electrode 203 on the one hand, and also the signal for image display on the other hand, maintaining the clamping pressure with the pixel electrode 202.

[0133] Correspondingly, in the W2 stage, the signals output by the scan line driving unit 102 to the scan lines G1, G2......G N are all modulated scan signals, and the signals output by the data line driving unit 103 to the data lines S1, S2......S N are modulated pixel voltage signals. The signals output by the common voltage generation circuit 105 to the common electrode 203 are all modulated common voltage signals, and the signals output by the touch detection unit 104 to the common electrode 203 are all modulated touch driving signals. Optionally, the touch driving signal output by the touch detection unit 104 is, for example, a signal modulated by the oscillation signal MGND from a constant voltage signal.

[0134] Continue to refer to Figure 2 , optionally, a ground wire L1 is formed on the touch display panel 10, and the ground wire L1 is connected to the output ground terminal of the modulation unit 1012. In the W1 stage, the modulation unit 1012 outputs a ground signal GND to the ground wire L1. In the W2 stage, the modulation unit 1012 directly outputs the oscillation signal MGND to the ground wire L1. It should be noted that Figure 2 the ground wire L1 in

[0135] is just an example of a small section, and it can also be a circle or a semi-circle, etc. The present application does not limit this

[0136] In this embodiment, the modulation unit 1012 includes two input terminals. One input terminal receives a first reference signal, that is, a ground signal, and the other input terminal receives a second reference signal provided by a voltage generation circuit. The following combines Figure 5 the circuit diagram of the modulation unit 1012 shown in

[0137] to illustrate the principle of the modulation unit 1012 generating an oscillation signal. The modulation unit 1012 includes a first active switch 211 and a second active switch 213. Among them, 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 terminals K1 and K2 are both connected to the controller 215. The second transmission terminal T2 of the first active switch 211 is connected to the first transmission terminal T3 of the second active switch 213, and an output node N is defined on the connection line. The first transmission terminal T1 of the first active switch 211 receives the first reference signal, and the second transmission terminal T4 of the second active switch 213 receives the second reference signal. The controller 215 controls the first and second active switches 211 and 213 to correspondingly control the output node N to alternately output the first reference signal and the second reference signal to form an oscillation signal MGND

[0138] In this embodiment, the first reference signal is the ground signal GND, and the second reference signal provides a driving voltage for the voltage generation circuit 1013. Correspondingly, the second transmission terminal T4 is connected to the voltage generation circuit 1013. The first transmission terminal T1 is an input terminal for receiving the ground signal GND, and the node N is an output terminal for outputting the oscillation signal MGND.

[0139] The first active switch 211 and the second active switch 213 are switches of suitable types such as thin film transistors, triodes, metal oxide semiconductor field effect transistors, etc.

[0140] The trigger unit 1011 is connected to the controller 215. The working steps of the modulation unit 1012 include: in the first stage 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 stage W2, the touch trigger signal TP sent by the trigger unit 1011 is at a high level, and the controller 215 controls the generation of the oscillation signal MGND based on the high level, and then outputs the oscillation signal MGND through the output terminal.

[0141] It should be noted that for the modulation unit 1012 in this embodiment, the basic signal received at the input terminal is the ground signal, and the modulation unit 1012 forms an oscillation signal through the ground signal. The control unit 101 is further configured to receive a voltage source signal and a reference voltage signal. Correspondingly, in other embodiments, the basic signal may also be one or more of a voltage source signal or a reference voltage signal. That is to say, the modulation unit 1012 can combine different signal sources with the driving voltage of the voltage generation circuit to form an oscillation signal with two reference voltages alternately output.

[0142] It should also be noted that the driving circuit 100 includes multiple functional units. For example, a scan line driving unit 102 that provides a scan signal for the touch display panel 10, a data line driving unit 103 that provides a pixel voltage for the touch display panel 10, a touch detection unit 104 that provides a touch driving signal for the touch display panel 10, and a common voltage generation circuit 105 that provides a common voltage for the touch display panel 10 and other functional units. There are also some functional units that provide signals for other functional units and are defined as source end units (not shown in the figure, such as a signal source), or there are some functional units that are used to process the signals fed back from the touch display panel 10 and are defined as feedback units (not shown in the figure, such as a calculation unit that calculates and compares the representative capacitance data of the touch detection feedback). Circuits similar to the source end unit or the feedback unit still receive, for example, the ground signal GND at the W2 stage. That is to say, at the W2 stage, the driving circuit 100 includes two domains: a first reference domain (control unit 101, source end unit, and feedback unit) based on the ground signal GND and a second reference domain (including the scan line driving unit 102, data line driving unit 103, touch detection unit 104, and common voltage generation circuit 105) based on the oscillation signal MGND.

[0143] Both the first reference domain and the second reference domain are based on GND at the W1 stage and do not require level conversion. At the W2 stage, since MGND raises the reference voltage of the second reference domain while the voltage of the first reference domain remains unchanged, there is a voltage difference between the two reference domains at the W2 stage. For some functional units, level conversion is required. In an alternative solution, a level conversion unit (not shown in the figure) can be set to separately control whether to perform level conversion on the corresponding signals during the first time period W1 and the second time period W2. Specifically, the level conversion unit can be implemented by setting a switch switching element.

[0144] In addition, due to the different reference voltages of the two reference domains, at the W2 stage, the current in the second reference domain with the raised reference voltage may flow back to the first reference domain. To prevent this phenomenon, a protection circuit (not shown in the figure) can be further included. The protection circuit is arranged between the first reference domain and the second reference domain to prevent current from flowing from the second reference domain to the first reference domain. Specifically, the protection circuit can be a unidirectional conduction diode.

[0145] Reference Figure 6 shows a functional block diagram of a touch display device according to another embodiment of the present application. The same or similar parts of the touch display device 3 in this embodiment and the touch display device 1 in the Figure 2 shown embodiment will not be described in detail. The difference between the touch display device 3 in this embodiment and the touch display device 1 in the previous embodiment is as follows:

[0146] The control unit 301 is configured to control the data line driving unit 303 to make the data line in a high impedance state within a first preset time when the first scan signal S1 drives the scan line; and within the first preset time, control the touch display panel 30 to perform touch detection based on the oscillation signal.

[0147] By making the data lines S1, S2......S N in a high impedance state, it can also ensure that during the process of the touch detection unit 304 performing touch detection within the first preset time, the signals on the data lines S1, S2......S N remain stable relative to the oscillation signal, without interfering with the touch detection process, and thus ensure that the touch detection process has an excellent detection environment.

[0148] Specifically, as Figure 6 shown, a switch K is provided between the data line driving unit 303 and the data line, and is in an off state within the first preset time when the first scan signal S1 starts to drive the scan line, so as to make the data lines S1, S2......S N maintain a high impedance state. In this way, even if the data line driving unit 303 is still providing display data, the display data is not loaded on the data lines S1, S2......S N and the display data has not been loaded onto the pixel electrode 402 yet. Therefore, the voltage on the data line and the pixel voltage on the pixel electrode 402 will be neutralized, and no excessive electrical signal interference will be generated. During this period, touch detection is performed, and no more noise interference will be generated.

[0149] Within the first preset time, the modulation unit 3012 can output an oscillation signal MGND, so that the signals on the touch display panel 10 are signals that change synchronously with the oscillation signal MGND. Although the data line remains in a high impedance state, correspondingly, the pixel voltage has not been loaded on the pixel electrode 402 yet. However, the scan signal is a modulation signal obtained by modulating the oscillation signal MGND, and the modulation signal obtained by modulating the oscillation signal MGND is also loaded on the common electrode 403. Due to capacitive coupling, the modulation signal can also be superimposed on conductors such as the data line and the pixel electrode 402, so as to reduce the charge and discharge amount of the parasitic capacitance between the conductors, and thus improve the signal-to-noise ratio of touch detection.

[0150] The switch K is further configured to be in a conducting state after the first preset time when the first scan signal S1 starts to drive the scan line, so as to connect the data line driving unit 303 and the data lines S1, S2......S NIn an electrically connected state, the display data provided by the data line driving unit 303 can be loaded onto the pixel electrode 402 through the data lines S1, S2......S N to charge the pixel 40 and achieve image display.

[0151] 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. The time for the touch detection unit 304 to perform touch detection is the touch time; the first duration is greater than a1 or equal to the sum of the second duration a2 and the touch time.

[0152] In this embodiment, the high-impedance state of the data line is achieved by setting the switch K. In other embodiments, other methods can also be used to make the data line in a high-impedance state within the first preset time when the first scan signal S1 starts to drive the scan line.

[0153] Optionally, the switch K can also be integrated on the touch display panel 30 or integrated in a chip.

[0154] It should be noted that in addition to the method of keeping the data line in a high-impedance state, the method of maintaining the current pixel voltage (i.e., the pixel voltage applied to the pixel electrode 402 of the previous row) within the first preset time can also be used, that is, the switch K is in a conducting state, so that the voltage on the data line remains unchanged and the pixel electrode 402 is charged to the current pixel voltage, which can also reduce the signal interference between pixel charging and touch detection to a certain extent. When the modulation unit 3012 generates an oscillation signal within the first preset time, the current pixel voltage output by the data line driving unit 303 is also modulated into a modulation signal, and both the pixel electrode 402 and the common electrode 403 are loaded with the modulation signal. After the first preset time, when the touch detection is completed, the voltage on the pixel electrode 402 is updated to the pixel voltage required for actual display by charging the pixel electrode 402.

[0155] For example but not limited to, the technical solutions in the above embodiments are mainly applicable to touch display panels using the dual gate mode or touch display panels using modes such as MUX1:3 and 1:6. Such touch display panels have fewer data lines and more scan lines, and normal display is completed by time-division multiplexing of the data lines. Therefore, for touch display panels using the dual gate mode or MUX1:3 and 1:6 modes, the scan time on the scan line is less, for example but not limited to about 4 microseconds or about 5 microseconds.

[0156] For a touch display panel using the dual gate mode, it can be, for example, an amorphous silicon or low-temperature polycrystalline silicon touch display panel.

[0157] For a touch display panel adopting modes such as MUX1:3 and 1:6, it can be, for example, a touch display panel made of low-temperature polysilicon.

[0158] For a touch display panel in a single-gate mode, it can be, for example, a touch display panel made of amorphous silicon.

[0159] However, alternatively, the technical solutions in the above embodiments can also be applicable to a touch display panel in a single-gate mode.

[0160] See Figures 7 to 9 , Figure 7 which is a schematic structural diagram of a touch display panel in a single-gate mode according to an embodiment of the present application. Figure 8 which is a schematic structural diagram of a touch display panel in a dual-gate mode according to an embodiment of the present application. Figure 9 which is a schematic structural diagram of a touch display panel adopting the MUX1:3 mode according to an embodiment of the present application. Generally, a touch display panel includes a plurality of pixel units M, and each pixel unit M includes at least pixel dots P of three colors: R (red), G (green), and B (blue). Pixel dots of different colors are used to emit visible light of different colors. Alternatively, in other embodiments, the pixel unit M may further include a pixel dot P of W (white) for emitting white visible light.

[0161] In Figure 7 the touch display panel of the embodiment, pixel dots 20 of each color in the same pixel unit M are connected to the same scan line, and pixel dots P of different colors are connected to different data lines. Thus, when a scan line is activated, all pixel dots P in the same pixel unit M are driven.

[0162] In Figure 8 the touch display panel of the embodiment, pixel dots P of two colors in the same pixel unit M are connected to the same scan line, and pixel dots P of another color are connected to another scan line, and pixel dots P of two colors are connected to the same data line, and pixel dots P of another color are connected to another data line. For example, taking a pixel unit M as an example, pixel dots P of R and B colors are connected to the same scan line, pixel dots P of G color are connected to another scan line, and pixel dots P of R and G colors are connected to the same data line, and pixel dots P of B color are connected to another data line. For different pixel units M, the connection relationships between pixel dots P and scan lines and data lines are not exactly the same. And, Figure 8 this is just an example. However, the connection relationship or arrangement relationship between sub-pixel dots P of each color and scan lines and data lines can also be other suitable ways. The present application does not limit this.

[0163] When all pixel points P in the same pixel unit M need to be driven, it is necessary to drive the two scan lines connected to the same pixel unit M successively, so as to complete the driving of the same pixel unit M.

[0164] In Figure 9 the touch display panel of the embodiment, 1 pixel unit M shares the same data line, and the pixel points P of each color are respectively connected to a scan line.

[0165] When all pixel points P in the same pixel unit M need to be driven, it is necessary to drive the three scan lines connected to the same pixel unit M successively, so as to complete the driving of the same pixel unit M.

[0166] By comparison, for Figures 7 to 9 the touch display panel in, because the pixel points P of different colors in the same pixel unit M need to time-division multiplex the same data line, therefore, to scan one pixel unit M, Figure 7 the activation time of each scan line in can be longer than Figure 8 and Figure 9 the activation time of the scan lines in, Figure 8 the activation time of each scan line in can be longer than Figure 9 the activation time of the scan lines in.

[0167] For example, Figures 8 to 9 the structure of the touch display panel in can be applied to the touch display panel 10 and the touch display panel 30. Correspondingly, the pixel point P is the corresponding pixel point 20 and pixel point 40.

[0168] Referring to Figures 10 to 12 , Figure 10 is a functional block diagram of a touch display device according to another embodiment of the present application. Figure 11 And Figure 12 are Figure 10 the driving signal schematic diagram and signal amplification diagram of the touch display device shown in the implementation.

[0169] It should be noted in advance that the technical solution of this embodiment is mainly applicable to the touch display panel in the single-gate mode. However, the present application does not limit this, and the technical solution of this embodiment can also be applicable to touch display panels with other suitable structures.

[0170] The touch display device 5 of this embodiment and the touch display device 1 shown in the foregoing embodiment Figure 2 will not be described in detail for their similarities or similarities. The following mainly describes the differences of the touch display device 5 of this embodiment.

[0171] In an embodiment, the control unit 501 is configured to control the scan line driving unit 502 to generate a plurality of identical scan signals S0, that is, the duration of the first signal of each scan signal S0 is the same. The duration of the first signal 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 detection time, so as to ensure that the processes of pixel charging and touch detection can be completed in each scan signal S0.

[0172] 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 in the first 5 microseconds. After 5 microseconds, the charging is completed, and the touch detection unit 504 performs touch detection in the next 5 microseconds of the scan signal S0.

[0173] Correspondingly, when each row of scan signals S0 is driven, the pixel charging in the W1 stage and the touch detection in the W2 stage are first performed. In the W2 stage, the modulation unit 5012 outputs an oscillation signal, so that the signals output by the scan 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 ( Figure 12 only one cycle is schematically shown for simplicity in the figure), so that the modulation signal or the oscillation signal superimposed due to capacitive coupling is loaded on conductors such as the scan line, the data line, the pixel electrode 602, and the common electrode 603, so that the signals on the touch display panel 50 change with the change of the oscillation signal, thereby reducing the charge and discharge power of the parasitic capacitance and improving the signal-to-noise ratio of touch detection.

[0174] Similarly, when the first signal of each scan signal S0 is a relatively long first duration, touch detection can also be performed first and then image display is refreshed under the control of each scan signal S0. An oscillation signal is generated during the touch detection process, and the signals on the touch display panel 60 change with the change of the oscillation signal. For example, the signals on the touch display panel 60 increase with the increase of the oscillation signal and decrease with the decrease of the oscillation signal. Optionally, the signals on the touch display panel 60 change synchronously with the change of the oscillation signal.

[0175] For example, Figure 7 the structure of the touch display panel in the figure can be applied to the touch display panel 50. Correspondingly, the pixel point P is the corresponding pixel point 60.

[0176] Figures 6 - 12 In other embodiments, the method for the control unit to generate an oscillation signal and for the oscillation signal to make the signals on the touch display panel change synchronously is the same as that in Figures 1 - 5It is the same as the embodiments shown and will not be described in detail here.

[0177] For the touch display devices 1, 3, and 5 in the embodiments of the present application, the utilization rate of the display time is increased, the refresh frame rate is increased, and the charge and discharge power of the parasitic capacitance on the touch display panels 10, 30, and 50 is also reduced, improving the detection signal-to-noise ratio of touch detection.

[0178] Refer to Figure 13 , Figure 13 is a functional block diagram of the electronic device according to the embodiment of the present application. The electronic device 1000 includes a touch display device 1001. The touch display device 1001 can be the touch display device 1, 3, or 5 described in any one of the above embodiments.

[0179] The electronic device 1000 can be a human-computer interaction device such as a mobile phone or a tablet computer.

[0180] 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, correspondingly, the electronic device 1000 also has these advantages.

[0181] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A touch display device, comprising a touch display panel and a driving circuit, The driving circuit is used to drive the touch display panel to achieve image display and touch detection, The touch display panel includes: Scanning lines arranged in rows, data lines arranged in columns, and a plurality of pixel points, the pixel points being located at the intersections between the scanning lines and the data lines. The touch display panel includes a plurality of pixel units, and each pixel unit includes three of the pixel points, respectively for emitting red visible light, green visible light, and blue visible light. For the same pixel unit, at least two of the three pixel points are connected to the same scanning line, and at least two pixel points are connected to the same data line. It is characterized in that the touch display panel includes: a first substrate and a second substrate disposed opposite to the first substrate, and a plurality of touch electrodes are further disposed between the second substrate and the first substrate, and the touch electrodes are self-capacitance or mutual-capacitance touch electrodes; The driving circuit includes: A scanning line driving unit for activating the pixel points connected to the scanning lines; A data line driving unit for providing a pixel voltage to the activated pixel points through the data lines; A touch detection unit for performing touch detection on the touch display panel; A control unit for controlling the touch detection unit to perform touch detection based on an oscillation signal when the scanning line driving unit activates the pixel points, and further for controlling the data line driving unit to provide a pixel voltage to the activated pixel points after the touch detection; The control unit generates the oscillation signal during the touch detection, so that the signal on the touch display panel is a signal that changes with the oscillation signal; Wherein, the scanning line driving unit is used to generate a scanning signal, the scanning signal includes a first signal and a second signal, the first signal is different from the second signal. For a scanning line: when the scanning line driving unit provides the first signal to the scanning line, the pixel points connected to the scanning line are activated, and when the scanning line driving unit provides the second signal to the scanning line, the pixel points connected to the scanning line are turned off; Wherein, the control unit includes: a trigger unit for controlling the scanning line driving unit to generate a first scanning signal and a second scanning signal with different durations of the first signal. The duration of the first signal of the first scanning signal is a first time period, and the duration of the first signal of the second scanning signal is a second time period, and the first time period is greater than the second time period; The control unit is used to control 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 points; and is further used to control the data line driving unit to charge the activated pixel points after the touch detection.

2. The touch display device according to claim 1, wherein, The control unit is used to control the data line driving unit to charge the activated pixel points for at least the second time period after the touch detection, and the time for the touch detection unit to perform touch detection is the touch time; the first time period is greater than or equal to the sum of the second time period and the touch time.

3. The touch display device according to claim 1, wherein, The scanning signal for realizing the display of one frame of image generated by the scanning line driving unit includes a plurality of scanning signal groups, and one scanning signal group includes: one of the first scanning signals and at least one of the second scanning signals.

4. The touch display device according to claim 3, wherein, The control unit is configured to control the data line driving unit to maintain the current pixel voltage or put the data line in a high impedance state within a first preset time when the first scan signal drives the scan line; and within the first preset time, control the touch display panel to perform touch detection based on the oscillation signal. The control unit is further configured to control the data line driving unit to charge the pixel after the first preset time when the first scan signal starts to drive the scan line.

5. The touch display device according to claim 4, wherein, A switch is provided between the data line driving unit and the data line. The control unit is configured to control the switch to be in an off state within a first preset time when the first scan signal starts to drive the scan line, so that the data line is in a high impedance state. The control unit is further configured to control the switch to be in an on state after the first preset time when the first scan signal starts to drive the scan line, so as to provide a pixel voltage to the data line.

6. The touch display device according to any one of claims 1 to 5, wherein, When performing touch detection, the control unit modulates the signal output from the driving circuit to the touch display panel through the oscillation signal to obtain a modulated signal; or causes the touch display panel to superimpose the oscillation signal due to capacitive coupling.

7. The touch display device according to claim 6, wherein, The pixel 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 image display. The driving circuit further includes a common voltage generation circuit, which is configured to provide a common voltage to the common electrode for image display. The touch detection unit is configured to provide a touch driving signal to the common electrode for touch detection.

8. The touch display device according to claim 7, wherein, The touch detection unit is configured to provide a touch driving signal to the same common electrode to perform image display and self-capacitance touch detection simultaneously.

9. The touch display device according to claim 7, wherein, 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 a plurality of common electrodes. The data selection unit is configured to select which common electrodes to output the common voltage to, and select which common electrodes to output the touch driving signal to.

10. The touch display device according to claim 7, wherein, When performing touch detection, the touch detection unit provides the touch driving signal to some of the common electrodes each time for self-capacitance touch sensing, and the common voltage generation circuit provides the common voltage to the remaining all or some of the common electrodes each time for image display, wherein the touch driving signal is the same as the common voltage.

11. The touch display device according to claim 7, wherein, The signals provided by the scan line driving circuit to the scan line, the signals provided by the data line driving circuit to the data line, the signals provided by the touch detection unit to the common electrode, and the signals provided by the common voltage generation circuit to the common electrode are all modulated signals obtained after modulating the oscillation signal.

12. The touch display device according to claim 7, wherein, The driving circuit includes an output terminal, which is used as an output ground terminal. When the driving circuit drives the touch display panel to perform touch detection, the output terminal is configured to output the oscillation signal. When the driving circuit drives the touch display panel to perform image display instead of touch sensing, the output terminal is configured to output a ground signal.

13. The touch display device according to claim 12, wherein, The scan line driving unit, the data line driving unit, the touch detection unit, the common voltage generating circuit are connected to the output terminal.

14. The touch display device according to claim 1, wherein The signals on the touch display panel increase as the oscillation signal increases and decrease as the oscillation signal decreases.

15. The touch display device according to claim 1, wherein When performing touch detection, the control unit generates an oscillation signal so that the signals on the touch display panel are signals that change synchronously with the change of the oscillation signal.

16. The touch display device according to claim 1, wherein For the same pixel unit, two pixel points are connected to the same scan line, another pixel point is connected to another adjacent scan line, and two pixel points are connected to the same data line, and another pixel point is connected to another adjacent data line; or, for the same pixel unit, each pixel point is respectively connected to different adjacent scan lines and is connected to the same data line.

17. The touch display device according to claim 1, wherein The control unit includes an output ground terminal for outputting a ground signal when charging a pixel point and outputting an oscillation signal generated based on the ground signal during touch detection; a ground wire is also formed on the touch display panel and is connected to the output ground terminal.

18. A touch display device, comprising a touch display panel and a driving circuit, The driving circuit is used to drive the touch display panel to implement image display and touch detection, The touch display panel includes: Scan lines arranged in rows, data lines arranged in columns, and a plurality of pixel points, the pixel points are located at the intersection between the scan lines and the data lines, the touch display panel includes a plurality of pixel units, each pixel unit includes three of the pixel points respectively for emitting red visible light, green visible light, and blue visible light, for the same pixel unit, at least two of the three pixel points are connected to the same scan line, and at least two pixel points are connected to the same data line; characterized in that the touch display panel includes: a first substrate and a second substrate disposed opposite to the first substrate, and a plurality of touch electrodes are further disposed between the second substrate and the first substrate, and the touch electrodes are self-capacitance or mutual-capacitance type touch electrodes; The driving circuit includes: A scan line driving unit for activating the pixel points connected to the scan lines; A data line driving unit for providing a pixel voltage to the activated pixel points through the data lines; A touch detection unit for performing touch detection on the touch display panel; A control unit for controlling the touch detection unit to perform touch detection based on an oscillation signal when the scan line driving unit activates the pixel points, and further for controlling the data line driving unit to provide a pixel voltage to the activated pixel points after touch detection; When performing touch detection, the control unit generates the oscillation signal so that the signals on the touch display panel are signals that change with the change of the oscillation signal; Wherein, For the same pixel unit, two pixel points are connected to the same scan line, another pixel point is connected to another adjacent scan line, and two pixel points are connected to the same data line, and another pixel point is connected to another adjacent data line; or, for the same pixel unit, each pixel point is respectively connected to different adjacent scan lines and is connected to the same data line.

19. A touch display device, comprising a touch display panel and a driving circuit, The driving circuit is used to drive the touch display panel to implement image display and touch detection, The touch display panel includes: Scan lines arranged in rows, data lines arranged in columns, and a plurality of pixel points, the pixel points being located at the intersections between the scan lines and the data lines. The touch display panel includes a plurality of pixel units, and each pixel unit includes three of the pixel points, respectively for emitting red visible light, green visible light, and blue visible light. For the same pixel unit, at least two of the three pixel points are connected to the same scan line, and at least two pixel points are connected to the same data line; characterized in that the touch display panel includes: a first substrate and a second substrate disposed opposite to the first substrate, and a plurality of touch electrodes are further disposed between the second substrate and the first substrate, and the touch electrodes are self-capacitance or mutual-capacitance type touch electrodes; The driving circuit includes: A scan line driving unit for activating the pixel points connected to the scan lines; A data line driving unit for providing pixel voltages to the activated pixel points through the data lines; A touch detection unit for performing touch detection on the touch display panel; A control unit for controlling the touch detection unit to perform touch detection based on an oscillation signal when the scan line driving unit activates the pixel points, and further for controlling the data line driving unit to provide pixel voltages to the activated pixel points after the touch detection; The control unit generates the oscillation signal during the touch detection, so that the signals on the touch display panel are signals that change with the oscillation signal; Wherein, the control unit includes an output ground terminal for outputting a ground signal when charging the pixel points and outputting an oscillation signal generated based on the ground signal during the touch detection; a ground wire is further formed on the touch display panel and is connected to the output ground terminal.

20. An electronic device, wherein Including: The touch display device according to any one of claims 1 to 19.

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