Touch display panel, driving method of touch display panel and display device

Abstract

The application discloses a touch display panel, a driving method of the touch display panel and a display device. The touch display panel comprises at least two sensing electrode groups, at least two multiplexers electrically connected with the sensing electrode groups, and a touch integrated circuit electrically connected with the multiplexers. The multiplexers at least comprise parallel touch paths and display paths. First resistors are arranged on the touch paths of the multiplexers, and / or second resistors are arranged on the display paths of the multiplexers. The total resistance between all the multiplexers and the corresponding sensing electrode groups is the same in a touch time period, thereby avoiding extra charge input caused by a parasitic capacitor and improving the accuracy of touch detection. The total resistance between all the multiplexers and the corresponding sensing electrode groups is also the same in a display time period, thereby making the brightness on the touch display panel uniform and improving the display effect.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a touch display panel, a driving method for the touch display panel, and a display device. Background Technology

[0002] With the development of technology, human-computer interaction interfaces, taking mobile terminals as an example, not only need to achieve gorgeous and colorful images, but also need to have touch functionality. Therefore, touch-enabled display panels have emerged. Consequently, TDDI (Touch and Display Driver Integration) products, which integrate LCD (Liquid Crystal Display) driver chips and touch chips into one unit, have gradually become the industry mainstream.

[0003] Among them, in-cell touch display panels, which integrate touch electrodes into the display panel process, are widely used due to their advantages in cost and thickness. Currently, in in-cell touch display panels, during the display period, the sensing electrodes are reused as common electrodes to control image display, and during the touch period, the sensing electrodes are used as touch sensors to realize touch control.

[0004] The sensing electrodes are arranged in an array in the touch display panel. Each column of sensing electrodes is connected to a multiplexer via a signal transmission line (traceline), and then to the driver chip. However, since the elongated driver chip is mostly located at the edge of the display panel, the distance from the traceline to the driver chip varies between different columns. This results in different resistances (trace resistances) on different tracelines, which affect the performance of the sensing electrodes: during the display period, the voltage at different sensing electrodes is different, leading to different charging and discharging capabilities of the pixels, resulting in uneven brightness on the display panel and affecting the display effect; during the touch period, parasitic capacitances inevitably exist between adjacent columns of sensing electrodes. The different trace resistances between different columns cause voltage differences across the parasitic capacitors, which can lead to abnormal charge injection when the sensing electrodes perform touch detection, increasing the noise of touch detection and affecting the accuracy of touch detection. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to propose a touch display panel, a driving method for the touch display panel, and a display device to solve the problems of uneven brightness of the display panel and poor touch detection accuracy caused by the different trace resistance of different columns of sensing electrodes, thereby optimizing the display effect and improving touch accuracy.

[0006] To achieve the above objectives, the present invention provides a touch display panel, comprising: at least two sensing electrode groups, at least two multiplexers electrically connected to the sensing electrode groups, and a touch integrated circuit electrically connected to the multiplexers;

[0007] The multiplexer includes at least a touch circuit and a display circuit connected in parallel; a first resistor is provided on the touch circuit of several multiplexers, and / or a second resistor is provided on the display circuit of several multiplexers.

[0008] Optionally, a first switch is provided on the touch circuit of the multiplexer, the first switch being connected in parallel with the first resistor, and / or a second switch is provided on the touch circuit of the multiplexer, the second switch being connected in parallel with the second resistor.

[0009] Optionally, the resistance values ​​of the first resistor and the second resistor are fixed.

[0010] Optionally, the resistance values ​​of the first resistors are different, and the resistance values ​​of the second resistors are different.

[0011] Optionally, both the first resistor and the second resistor are adjustable resistors.

[0012] Optionally, the touch display panel further includes a plurality of first timing control modules and a plurality of second timing control modules; the multiplexer with the first resistor is connected to the first timing control module, the first timing control module being electrically connected to the first resistor, and is used to adjust the resistance value of the first resistor according to the timing; the multiplexer with the second resistor is connected to the second timing control module, the second timing module being electrically connected to the second resistor, and is used to adjust the resistance value of the second resistor according to the timing.

[0013] Optionally, the touch display panel further includes several timing control modules. The multiplexer, which is provided with the first resistor or the second resistor, is connected to the timing control module. The timing control module is electrically connected to each of the first resistor and each of the second resistors and is used to adjust the resistance value of the first resistor or the second resistor according to the timing.

[0014] Optionally, the sensing electrode group and the multiplexer are arranged along a first direction and the multiplexer is located on the same side of the touch electrode group; each sensing electrode group includes a plurality of sensing electrodes arranged along a second direction, and each sensing electrode is connected to the multiplexer.

[0015] Optionally, the trace resistance between the multiplexer with the first resistor and / or the second resistor and the corresponding sensing electrode group is less than the trace resistance between the multiplexer without the first resistor or the second resistor and the corresponding sensing electrode group.

[0016] The present invention also proposes a display device, including the touch display panel.

[0017] Optionally, the sensing electrodes in the sensing electrode group are reused as common electrodes during the display time period.

[0018] This invention also proposes a driving method for a touch display panel, comprising:

[0019] During the touch period, the first resistor is connected to the touch circuit of the multiplexer so that the resistance values ​​between the touch circuits of all multiplexers and the corresponding sensing electrode groups are the same.

[0020] During the display period, the second resistor is connected to the display path of the multiplexer so that the resistance values ​​between the display paths of all multiplexers and the corresponding sensing electrode groups are the same.

[0021] Optionally, during the touch control period, the first timing control module adjusts the resistance value of the first resistor of the multiplexers according to the timing, so that the resistance value between the touch path of all multiplexers and the corresponding sensing electrode group is the same.

[0022] During the display period, the second timing control module adjusts the resistance values ​​of the second resistors of the multiplexers according to the timing sequence, so that the resistance values ​​between the display path of all multiplexers and the corresponding sensing electrode group are the same.

[0023] Optionally, during the touch control period, the timing control module adjusts the resistance value of the first resistor of the multiplexers according to the timing sequence, so that the resistance value between the touch path of all multiplexers and the corresponding sensing electrode group is the same.

[0024] During the display period, the timing control module adjusts the resistance values ​​of the second resistors of the multiplexers according to the timing sequence, so that the resistance values ​​between the display path of all multiplexers and the corresponding sensing electrode group are the same.

[0025] Compared with the prior art, the technical solution of the present invention has the following advantages and beneficial effects:

[0026] In the touch display panel disclosed in this invention, the multiplexer includes touch circuits and display circuits connected in parallel. By setting a first resistor on the touch circuits of several multiplexers, the total resistance between all multiplexers and their corresponding sensing electrode groups is the same during the touch time period, thereby making the voltage of each sensing electrode the same, avoiding additional charge input caused by parasitic capacitance, and improving touch detection accuracy. By setting a second resistor on the display circuits of several multiplexers, the total resistance between all multiplexers and their corresponding sensing electrode groups is also the same during the display time period, thereby making the voltage of each sensing electrode the same during the display time period, ensuring consistent charging and discharging capabilities of the pixel electrodes, and thus making the brightness on the touch display panel uniform and improving the display effect.

[0027] Furthermore, the present invention sets the first resistor and the second resistor as adjustable resistors, and sets a timing control module to adjust the resistance values ​​of the first resistor and the second resistor according to the timing sequence. The resistance value can be adjusted according to the timing sequence, thereby improving the flexibility and adaptability of the circuit, making the resistance adjustment more precise, and further improving the display effect and touch detection effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a touch display panel;

[0029] Figure 2 This is a schematic diagram of the circuit connection relationship of a sensing electrode in a current touch display panel;

[0030] Figure 3 This is a schematic diagram of the circuit connection relationship of a sensing electrode in a touch display panel according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the circuit connection relationship of a sensing electrode in another touch display panel according to an embodiment of the present invention. Detailed Implementation

[0032] The following will be combined with the embodiments of the present invention. Figures 1-4 The technical solutions, structural features, objectives and effects achieved in the embodiments of the present invention will be described in detail.

[0033] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in the present invention, provided that they do not affect the effects and objectives that the present invention can produce.

[0034] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only the expressly listed elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0035] A display device includes a touch display panel, such as Figure 1 As shown, the touch display panel includes a display area 10 and a chip area 20. The display area 10 is provided with at least two sensing electrode groups, and the chip area 20 is provided with a plurality of multiplexers 21 connected to the sensing electrode groups, as well as a touch integrated circuit 22.

[0036] At least two of the sensing electrode groups are arranged along a first direction, and each sensing electrode group includes a plurality of sensing electrodes 11 arranged along a second direction. In this embodiment, N (N≥4) sensing electrode groups are arranged along the first direction, and each sensing electrode group includes m (m≥6) sensing electrodes 11 arranged along the second direction, thereby setting m×N sensing electrodes 11 in the display area 10 to form an m-row N-column sensing electrode array to realize the touch and display functions of the touch display panel. During the touch period, the sensing electrodes 11 work as touch sensors, detecting the capacitance change of the touch display panel and transmitting the capacitance change signal to the circuit of the chip area 20; during the display period, the sensing electrodes 11 are connected to the common voltage VCOM and multiplexed as common electrodes, participating in display control together with the pixel electrodes to realize image display.

[0037] The number of multiplexers 21 is also N, each corresponding to one of the sensing electrode groups and electrically connected via signal transmission lines 12. The N multiplexers 21 are located on the same side of each sensing electrode group. Each sensing electrode 11 in each sensing electrode group is connected to its corresponding multiplexer 21 via a separate signal transmission line 12. Therefore, each multiplexer 21 is connected to m sensing electrodes 11, and m×N signal transmission lines 12 are distributed within the touch display panel. In other embodiments, multiple sensing electrodes 11 in the same sensing electrode group may also be connected to different multiplexers 21, and the connection can be configured and selected according to actual conditions.

[0038] Taking a single sensing electrode 11 as an example, the circuit connection relationship of the touch display panel is illustrated, such as... Figure 2As shown, the multiplexer 21 includes a touch path 25 and a display path 26 connected in parallel, and is also electrically connected to the touch integrated circuit 22. The touch path 25 is connected to the sensing electrode 11 and includes a first branch, a second branch, and a third branch connected in parallel. The first branch is grounded (GND), the second branch is connected to the data transmission voltage (VDT), and the third branch is connected to the touch integrated circuit 22. During the touch operation period, the multiplexer 21 is switched to operate on the touch path 25. The capacitance change signal of the sensing electrode 11 is transmitted to the touch integrated circuit 22 for amplification, filtering, and other processing to detect and locate the touch operation. During this period, the data transmission voltage (VDT) provides the operating voltage. The display path 26 is also connected to the sensing electrode 11 and includes a fourth branch and a fifth branch connected in parallel. The fourth branch is grounded (GND), and the fifth branch is connected to the common voltage (VCOM). During the display period, the multiplexer 21 is switched to the display path 26, and the sensing electrode 11 is connected to the common voltage VCOM and multiplexed as a common electrode, thereby participating in the display control together with the pixel electrode. At the same time, the multiplexer 21 is also connected to the display driving circuit (not shown in the figure) during the display period to receive the display control signal, so that the common electrode and the pixel electrode realize the image display according to the display control signal.

[0039] Each sensing electrode 11 is connected to one of the first, second, third, fourth, and fifth branches by a switch to control the connection or disconnection of each branch. This switch configuration and connection mechanism are standard design features of TDDI chips and will not be elaborated upon here.

[0040] The touch integrated circuit 22 includes an analog front-end 23 (AFE), an analog-to-digital converter 24 (ADC), etc. The analog front-end 23 includes signal amplification circuits, filtering circuits, logic judgment circuits, etc., which amplify, filter, and judge the capacitance change signal during the touch period to determine the touch position, type, and other information. During this period, the operating voltage provided by the data transmission voltage VDT and the reference reference provided by the reference voltage VREF work together to ensure the accuracy of signal processing.

[0041] Considering that each multiplexer 21 is connected to m sensing electrodes 11, the multiplexer 21 is configured to select and transmit the capacitance change signals transmitted by the multiple sensing electrodes 11 in a time-division manner, thereby ensuring that the touch signals can be processed in an orderly manner to accurately detect and locate the touch operation.

[0042] Since the chip area 20 is typically located on one or more edges of the touch display panel and is elongated, the lengths of the signal transmission lines 12 between the sensing electrodes 11 and the corresponding multiplexers 21 at different locations within the touch display panel are different. This results in the resistance Rf (hereinafter referred to as trace resistance Rf) of each signal transmission line 12 not being exactly the same. The trace resistance Rf corresponding to the sensing electrode 11 farther from the chip area 20 is larger, while the trace resistance Rf corresponding to the sensing electrode 11 closer to the chip area 20 is smaller. Consequently, during the display period, the voltage at the sensing electrodes 11 at different locations varies. The differences in the pixel electrodes result in varying charging and discharging capabilities, leading to uneven brightness on the touch display panel and noticeable bright lines, thus affecting the display effect. During the touch period, parasitic capacitance inevitably exists between two adjacent sensing electrodes 11 that are at different distances from the chip area 20. Since the trace resistance Rf corresponding to these two sensing electrodes 11 is different, there is a voltage difference across the parasitic capacitor. Therefore, when the sensing electrode 11 performs touch detection, this parasitic capacitance will cause abnormal charge injection into the sensing electrode 11 on the side with the lower voltage, resulting in high noise in touch detection and affecting detection accuracy.

[0043] To solve this problem, such as Figure 3 As shown, in this embodiment, a first resistor R1 is set on the touch path 25 of the multiplexer 21, and a second resistor R2 is set on the display path 26 of the multiplexer 21. This is used to adjust the total resistance between the sensing electrode 11 at different positions and the multiplexer 21, so that the voltage of the sensing electrode 11 at different positions is the same regardless of whether it is the display time period or the touch time period. This makes the display time period uniform and improves the detection accuracy of the touch time period.

[0044] Specifically, the first resistor R1 and the second resistor R2 are resistors with fixed resistance values. The first resistor R1 is connected in series with the main circuit of the touch circuit 25, so that the first resistor R1 can be connected to the first branch, the second branch, and the third branch of the touch circuit 25. During the touch period, the first resistor R1 is introduced into the ground line (GND), the data transmission voltage VDT, and the m sensing electrodes 11 connected to the multiplexer 21 by the touch integrated circuit 22. This makes the total resistance between the multiplexer 21 and the sensing electrodes 11 the sum of the first resistor R1 and the corresponding trace resistance Rf. By setting different values ​​of the first resistor R1 on the touch circuit 25 of different multiplexers 21, the total resistance between all multiplexers 21 and the corresponding sensing electrode groups can be the same during the touch period, thereby making the voltage of each sensing electrode 11 the same, avoiding the additional charge input caused by parasitic capacitance, and improving the accuracy of touch detection. The second resistor R2 is connected in series with the main circuit of the display circuit 26, allowing it to be connected to the fourth and fifth branches of the display circuit 26 and the display driving circuit. During the display period, the second resistor R2 is introduced between the ground (GND), the common voltage VCOM, and the m sensing electrodes 11 connected to the multiplexer 21. This ensures that the total resistance between the multiplexer 21 and the sensing electrodes 11 is the sum of the second resistor R2 and the corresponding trace resistance Rf. By setting different sized second resistors R1 on the display circuit 26 of different multiplexers 21, the total resistance between all multiplexers 21 and their corresponding sensing electrode groups is the same during the display period. This ensures that the voltage of each sensing electrode 11 is the same during the display period, resulting in consistent charging and discharging capabilities for the pixel electrodes. Consequently, the brightness on the touch display panel is uniform, improving the display effect.

[0045] Furthermore, switches are used to control whether the first resistor R1 and the second resistor R2 are connected to the circuit of the multiplexer 21. The touch circuit 25 of the multiplexer 21 is equipped with a first switch K1, which is connected in parallel with the first resistor R1. When it is necessary to introduce the first resistor R1 into the touch circuit 25, the first switch K1 is opened, allowing current to flow only through the first resistor R1. When it is not necessary to introduce the first resistor R1, the first switch K1 is closed, short-circuiting the first resistor R1. Similarly, the display circuit 26 of the multiplexer 21 is equipped with a second switch K2, which is connected in parallel with the second resistor R2. When it is necessary to introduce the second resistor R2 into the display circuit 26, the second switch K2 is opened. When it is not necessary to introduce the second resistor R2, the second switch K2 is closed, short-circuiting the second resistor R2. The existing touch path 25 switch and display path 26 switch can be used as the first switch K1 and the second switch K2. The touch path 25 switch and display path 26 switch are used to control whether the touch path 25 and the display path 26 are connected.

[0046] Furthermore, when the first resistor R1 or the second resistor R2 is not required, to more effectively eliminate the influence of the first resistor R1 or the second resistor R2, a third switch K3 is set in series with the first resistor R1 on the branch connected in parallel with the first switch K1, and a fourth switch K4 is set in series with the second resistor R2 on the branch connected in parallel with the second switch K2. When the first resistor R1 needs to be introduced into the touch circuit 25, the first switch K1 is opened and the third switch K3 is closed; when the first resistor R1 is not required, the first switch K1 is closed and the third switch K3 is opened. When the second resistor R2 needs to be introduced into the display circuit 26, the second switch K2 is opened and the fourth switch K4 is closed; when the second resistor R2 is not required, the second switch K2 is closed and the fourth switch K4 is opened.

[0047] It should be noted that, due to the different circuits for the display time period and the touch time period, the difference in the trace resistance Rf in the current circuit may be significant or insignificant. This means that the problems of the display time period and the touch time period may coexist significantly, or only one time period may have a significant problem while the other time period is negligible. Therefore, a first resistor R1 and a second resistor R2 can be set on the touch circuit 25 and the display circuit 26 as needed. If the problem of the touch time period is negligible, the second resistor R2 can be set only on the display circuit 26, and vice versa. If the problems of both time periods coexist significantly, then both the first resistor R1 and the second resistor R2 should be set.

[0048] Furthermore, based on the actual wiring resistance between the multiplexer 21 and the corresponding sensing electrode group, a first resistor R1 or a second resistor R2 is provided on several touch paths 25 or several display paths 26, instead of providing a first resistor R1 and a second resistor R2 in every multiplexer 21, thereby simplifying the circuit structure. For example, the first resistor R1 or the second resistor R2 is only provided on some multiplexers 21 with a smaller wiring resistance Rf to the sensing electrode group, while the first resistor R1 or the second resistor R2 is not provided on the multiplexers 21 with a larger wiring resistance Rf. This makes the total resistance between the multiplexer 21 with the first resistor R1 or the second resistor R2 and the corresponding sensing electrode group the same as the wiring resistance Rf between the multiplexer 21 without the resistor and the corresponding sensing electrode group, that is, making the voltage of the two sensing electrode groups the same. At this time, the trace resistance Rf between the multiplexer 21 with the first resistor R1 and the second resistor R2 and the corresponding sensing electrode group is less than the trace resistance Rf between the multiplexer 21 without the first resistor R1 or the second resistor R2 and the corresponding sensing electrode group.

[0049] There is no limiting relationship between the first resistor R1 and the second resistor R2. The multiplexer 21 with the first resistor R1 and the multiplexer 21 with the second resistor R2 may or may not overlap.

[0050] Based on the aforementioned touch display panel, this embodiment also discloses a driving method for the touch display panel, comprising:

[0051] During the touch period, the first resistor R1 is connected to the touch path 25 of the multiplexer 21, so that the resistance value between the touch path 25 of all multiplexers 21 and the corresponding sensing electrode group is the same.

[0052] During the display period, the second resistor R2 is connected to the display path 26 of the multiplexer 21, so that the resistance values ​​between the display path 26 of all multiplexers 21 and the corresponding sensing electrode group are the same.

[0053] Specifically, during the touch operation period, each multiplexer 21 is switched to operate on the touch path 25. At this time, the first switch K1 in the multiplexer 21 equipped with the first resistor R1 is open, and the third switch K3 is closed. This connects each first resistor R1 to its corresponding touch path 25, ensuring that the total resistance between the touch path 25 of all multiplexers 21 and their corresponding sensing electrode groups is the same. Consequently, the voltage at each sensing electrode 11 is the same, avoiding additional charge input caused by parasitic capacitance and improving touch detection accuracy. During the display operation period, each multiplexer 21 is switched to operate on the display path 26. At this time, the second switch K2 in the multiplexer 21 equipped with the second resistor R2 is open, and the fourth switch K4 is closed. This connects each second resistor R2 to its corresponding display path 26, ensuring that the total resistance between the display path 26 of all multiplexers 21 and their corresponding sensing electrode groups is the same. Consequently, the voltage at each sensing electrode 11 is the same, resulting in uniform brightness on the touch display panel.

[0054] like Figure 4 The diagram shows the circuit connection of a sensing electrode 11 in another touch display panel according to an embodiment of the present invention. The difference from the above embodiment is that in this embodiment, the first resistor R1 and the second resistor R2 are adjustable resistors, and a timing control module 27 is also provided to adjust the resistance values ​​of the first resistor R1 and the second resistor R2.

[0055] The timing control module 27 is connected one-to-one with a multiplexer 21 equipped with either the first resistor R1 or the second resistor R2. Specifically, the timing control module 27 is electrically connected to the first resistor R1. During the touch period, the timing control module 27 adjusts the resistance value of the first resistor R1 according to the timing, so that the total resistance value between the corresponding touch path 25 and the sensing electrode group is the same as the total resistance value between other touch paths 25 and their corresponding sensing electrode groups. The timing control module 27 is also electrically connected to the second resistor R2. During the display period, the timing control module 27 adjusts the resistance value of the second resistor R2 according to the timing, so that the total resistance value between the corresponding display path 26 and the sensing electrode group is the same as the total resistance value between other display paths 26 and their corresponding sensing electrode groups.

[0056] In this embodiment, since each multiplexer 21 is equipped with a first resistor R1 and a second resistor R2, each multiplexer 21 is connected to a timing control module 27. This timing control module 27 is electrically connected to both the first resistor R1 and the second resistor R2 of the multiplexer 21. When a timing control module 27 receives a timing control signal, it adjusts the resistance value of either the first resistor R1 or the second resistor R2 accordingly. Then, it sends the timing control signal to the next timing control module 27, causing the next timing control module 27 to adjust the first resistor R1 or the second resistor R2 in its corresponding multiplexer 21, and so on, until all timing control modules 27 have completed the resistance adjustment. Compared to fixed resistors R1 and R2, this embodiment uses adjustable resistors, allowing the resistance value to be adjusted according to the timing, thereby improving the circuit's flexibility and adaptability, making the resistance adjustment more precise, and improving the display and touch detection effects. Furthermore, since the first resistor R1 and the second resistor R2 share a single timing control module 27, the circuit is simplified.

[0057] The touch display panel also includes a timing controller for generating the timing control signal. The timing control module 27 is connected to the timing controller to receive the timing control signal, thereby adjusting the resistance value of the adjustable resistor in the multiplexer 21. In further embodiments, the timing controller also sends corresponding timing control signals to the multiplexer 21, the touch integrated circuit 22, and the display driver circuit to control the switching of touch and display time periods and coordinate the working timing of various touch and display functions, ensuring accurate touch detection and correct transmission and display of image data.

[0058] In other embodiments, when only some multiplexers 21 are provided with a first resistor R1 or a second resistor R2, a timing control module 27 is provided at the multiplexer 21 provided with the first resistor R1 or the second resistor R2 to adjust the resistance. However, for multiplexers 21 that are neither provided with a first resistor R1 nor a second resistor R2, there is no need to provide a timing control module 27.

[0059] Based on this touch display panel, this embodiment discloses a corresponding driving method for the touch display panel, including:

[0060] During the touch control period, the first resistor R1 is connected to the touch path 25 of the multiplexer 21. The timing control module 27 adjusts the resistance value of the first resistor R1 of the multiple multiplexers 21 according to the timing, so that the resistance value between the touch path 25 of all multiplexers 21 and the corresponding sensing electrode group is the same.

[0061] During the display period, the second resistor R2 is connected to the display path 26 of the multiplexer 21. The timing control module 27 adjusts the resistance value of the second resistor R2 of the multiple multiplexers 21 according to the timing, so that the resistance value between the display path 26 of all multiplexers and the corresponding sensing electrode group is the same.

[0062] During this process, the timing control module 27 receives the timing control signal sent by the timing controller, and adjusts the resistance values ​​of multiple first resistors R1 or second resistors R2 in sequence according to the timing control signal.

[0063] It should be noted that in this solution, adjustable resistors are set separately for touch circuit 25 and display circuit 26, instead of setting an adjustable resistor on the common main circuit of touch circuit 25 and display circuit 26 for multiplexing. This setting is beneficial for accurately adjusting the total resistance between multiplexer 21 and sensing electrode group during the touch time period and the display time period respectively. This is because the circuits during the touch time period and the display time period are different, the difference in trace resistance Rf and its impact on the circuit are also different. Therefore, it is necessary to set the specifications of the adjustable resistors separately for precise resistance adjustment.

[0064] In another embodiment of the touch display panel, when the first resistor R1 and the second resistor R2 are adjustable resistors, a first timing control module and a second timing control module can be respectively configured in the multiplexer 21 that is configured with the first resistor R1 or the second resistor R2 to adjust the resistance values ​​of the first resistor R1 and the second resistor R2 respectively. The first timing control module is electrically connected to the first resistor R1 and is used to adjust the resistance value of the first resistor R1 according to timing; the second timing module is electrically connected to the second resistor R2 and is used to adjust the resistance value of the second resistor R2 according to timing.

[0065] Both the first timing control module and the second timing control module are connected to the timing controller. During the touch period, the timing controller sends a timing control signal to the first timing control module, causing each first timing control module to adjust the resistance value of each first resistor R1 according to the timing. During the display period, the timing controller sends a timing control signal to the second timing control module, causing each second timing control module to adjust the resistance value of each second resistor R2 according to the timing.

[0066] Based on this touch display panel, this embodiment also discloses a corresponding driving method for the touch display panel, including:

[0067] During the touch control period, the first resistor R1 is connected to the touch path 25 of the multiplexer 21. The first timing control module adjusts the resistance value of the first resistor R1 of the multiple multiplexers 21 according to the timing, so that the resistance value between the touch path 25 of all multiplexers 21 and the corresponding sensing electrode group is the same.

[0068] During the display period, the second resistor R2 is connected to the display path 26 of the multiplexer 21. The second timing control module adjusts the resistance value of the second resistor R2 of the multiple multiplexers 21 according to the timing, so that the resistance value between the display path 26 of all multiplexers 21 and the corresponding sensing electrode group is the same.

[0069] During this process, the first timing control module receives a timing control signal sent by the timing controller during the touch time period, and adjusts the resistance values ​​of multiple first resistors R1 sequentially according to the timing control signal; the second timing control module receives a timing control signal sent by the timing controller during the display time period, and adjusts the resistance values ​​of multiple second resistors R2 sequentially according to the timing control signal.

[0070] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A touch display panel, characterized in that, include: At least two sensing electrode groups, at least two multiplexers electrically connected to the sensing electrode groups, and a touch integrated circuit electrically connected to the multiplexers; The multiplexer includes at least a touch circuit and a display circuit connected in parallel; a first resistor is provided on the touch circuit of several multiplexers, and / or a second resistor is provided on the display circuit of several multiplexers.

2. The touch display panel as described in claim 1, characterized in that, The multiplexer has a first switch on its touch circuit, which is connected in parallel with the first resistor, and / or, the multiplexer has a second switch on its touch circuit, which is connected in parallel with the second resistor.

3. The touch display panel as described in claim 1, characterized in that, The resistance values ​​of the first resistor and the second resistor are fixed.

4. The touch display panel as described in claim 3, characterized in that, The resistance values ​​of several of the first resistors are different, and the resistance values ​​of several of the second resistors are different.

5. The touch display panel as described in claim 1, characterized in that, Both the first resistor and the second resistor are adjustable resistors.

6. The touch display panel as described in claim 5, characterized in that, The touch display panel further includes several first timing control modules and several second timing control modules; the multiplexer with the first resistor is connected to the first timing control module, which is electrically connected to the first resistor and is used to adjust the resistance value of the first resistor according to the timing. The multiplexer equipped with the second resistor is connected to the second timing control module, which is electrically connected to the second resistor and is used to adjust the resistance value of the second resistor according to the timing.

7. The touch display panel as described in claim 5, characterized in that, The touch display panel also includes several timing control modules. The multiplexer, which is equipped with the first resistor or the second resistor, is connected to the timing control module. The timing control module is electrically connected to each of the first resistor and each of the second resistors and is used to adjust the resistance value of the first resistor or the second resistor according to the timing.

8. The touch display panel as described in claim 1, characterized in that, The sensing electrode group and the multiplexer are arranged along a first direction and the multiplexer is located on the same side of the touch electrode group; each sensing electrode group includes a plurality of sensing electrodes arranged along a second direction and each sensing electrode is connected to the multiplexer.

9. The touch display panel as described in claim 4, 6, or 7, characterized in that, The trace resistance between the multiplexer equipped with the first resistor and / or the second resistor and the corresponding sensing electrode group is less than the trace resistance between the multiplexer without the first resistor or the second resistor and the corresponding sensing electrode group.

10. A display device, characterized in that, Includes the touch display panel as described in any one of claims 1 to 9.

11. The display device as claimed in claim 10, characterized in that, The sensing electrodes in the sensing electrode group are reused as common electrodes during the display time period.

12. A driving method for a touch display panel as described in any one of claims 1 to 9, characterized in that, include: During the touch period, the first resistor is connected to the touch circuit of the multiplexer so that the resistance values ​​between the touch circuits of all multiplexers and the corresponding sensing electrode groups are the same. During the display period, the second resistor is connected to the display path of the multiplexer so that the resistance values ​​between the display paths of all multiplexers and the corresponding sensing electrode groups are the same.

13. The driving method for a touch display panel as described in claim 12, characterized in that, During the touch control period, the first timing control module adjusts the resistance value of the first resistor of the multiple multiplexers according to the timing, so that the resistance value between the touch path of all multiplexers and the corresponding sensing electrode group is the same. During the display period, the second timing control module adjusts the resistance values ​​of the second resistors of the multiplexers according to the timing sequence, so that the resistance values ​​between the display path of all multiplexers and the corresponding sensing electrode group are the same.

14. The driving method for a touch display panel as described in claim 12, characterized in that, During the touch control period, the timing control module adjusts the resistance value of the first resistor of the multiplexers according to the timing sequence, so that the resistance value between the touch path of all multiplexers and the corresponding sensing electrode group is the same. During the display period, the timing control module adjusts the resistance values ​​of the second resistors of the multiplexers according to the timing sequence, so that the resistance values ​​between the display path of all multiplexers and the corresponding sensing electrode group are the same.

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