Touch display panel and display device

Abstract

The application provides a touch display panel and a display device. The touch display panel comprises a plurality of first common electrode blocks arranged in an array and a plurality of switches. The first common electrode blocks located in the edge row or the edge column are composed of a second common electrode block and a third common electrode block arranged side by side. The second common electrode block and the third common electrode block are connected through the switches. When the first common electrode block at the edge of the touch display panel is touched, the switch receives a second level signal and is disconnected. The second common electrode block and the third common electrode block form two rows or two columns of separated common electrode blocks. Therefore, the touch data of one side or two sides can be additionally provided as the reference data of the touch point when the edge is touched, so that the accuracy of the touch position determination is improved.

Description

Technical Field

[0001] This invention belongs to the field of touch display panel technology, and particularly relates to a touch display panel and a display device. Background Technology

[0002] Existing in-cell touch panels typically divide the common electrode layer of the liquid crystal display (LCD) into multiple common electrode blocks, and each common electrode block is electrically connected to a driving circuit via a trace. These common electrode blocks are reused as touch sensing electrodes. In display mode, the common electrode blocks receive common electrode voltage; in touch mode, they act as touch sensing electrodes, sensing touch actions and outputting sensing signals.

[0003] In the touch display panel, the touch feel at the edge is worse than that in the middle area. This is because when a living organism touches the middle area, the touch position can be accurately determined by comparing the data characteristics of the surrounding common electrode blocks, since there are common electrode blocks around the middle area. However, when touching the edge, the common electrode blocks at the edge lack data from the common electrode blocks on one or both sides as a reference, so the touch position cannot be accurately determined. Summary of the Invention

[0004] The purpose of this invention is to provide a touch display panel that solves the problem that traditional touch display panels cannot accurately determine the touch position when touching the edge.

[0005] A first aspect of this invention provides a touch display panel, comprising:

[0006] Multiple first common electrode blocks are arranged in an array, and the first common electrode blocks are reused as touch sensing electrodes. The first common electrode blocks located in the edge rows are composed of second common electrode blocks and third common electrode blocks arranged side by side along the column direction, and the first common electrode blocks located in the edge columns are composed of second common electrode blocks and third common electrode blocks arranged side by side along the row direction.

[0007] Multiple switches, each switch being connected between a second common electrode block and a third common electrode block corresponding to a first common electrode block, wherein the switch is triggered to turn on when a first level signal is received when the touch display panel is in a first trigger state, and triggered to turn off when a second level signal is received when the touch display panel is in a second trigger state;

[0008] The first trigger state is: the first common electrode block of the edge row or column of the touch display panel has no touch action;

[0009] The second trigger state is: the first common electrode block of the edge row or column of the touch display panel has a touch action.

[0010] Optionally, the touch display panel includes a display area and a non-display area surrounding the display area;

[0011] The first common electrode block arranged in an array is located in the display area;

[0012] Multiple of the switches are located in the non-display area.

[0013] Optionally, the first common electrode block is arranged in an M-row N-column array;

[0014] The second common electrode block and the third common electrode block of the first common electrode block in the first column and the Nth column are arranged side by side along the row direction, and the second common electrode block and the third common electrode block of the first common electrode block in the second column to the N-1th column of the first row are arranged side by side along the column direction;

[0015] Alternatively, the second and third common electrode blocks of the first common electrode block in the first row are arranged side by side along the column direction, the second and third common electrode blocks of the first common electrode block in the second to M rows of the first column are arranged side by side along the row direction, and the second and third common electrode blocks of the first common electrode block in the second to M rows of the Nth column are arranged side by side along the row direction.

[0016] Optionally, each of the second common electrode blocks is disposed near the edge of the display area;

[0017] The size of the second common electrode block is less than or equal to the size of the third common electrode block.

[0018] A second aspect of the present invention provides a display device, including a driving circuit and a touch display panel as described above, wherein the driving circuit is connected to a plurality of switches, a plurality of first common electrode blocks, a plurality of second common electrode blocks and a third common electrode block of the touch display panel;

[0019] The driving circuit is used for:

[0020] When no touch action is detected on the first common electrode block of the edge row or column of the touch display panel, multiple first level signals are output to multiple switches.

[0021] And when a touch action is detected on the first common electrode block of the edge row or column of the touch display panel, multiple second level signals are output to the multiple switches.

[0022] Optionally, the touch display panel further includes:

[0023] The pixel units are arranged in an array, each pixel unit including a thin-film transistor and a pixel electrode connected to each other, the pixel electrode being disposed opposite to the common electrode block;

[0024] The driving circuit is also used for:

[0025] During the display period, data signals are output to the pixel electrodes and common electrode voltages are output to each of the first common electrode blocks;

[0026] During the touch period, when no touch action is detected on the first common electrode block of the edge row or column of the touch display panel, the first level signal is output, and a first pulse scan signal is output to the pixel electrode and a second pulse scan signal is output to the first common electrode block. The voltage amplitude of the first pulse scan signal and the second pulse scan signal are the same.

[0027] During the touch period, when a touch action is detected on the first common electrode block of the edge row or column of the touch display panel, a corresponding second level signal is output, and a third pulse scan signal is output to the plurality of pixel electrodes corresponding to each of the second common electrode blocks in the adjacent row or column of the touch position. The voltage of the third pulse scan signal is greater than the voltage of the first pulse scan signal.

[0028] Optionally, the driving circuit includes:

[0029] A source driving circuit, connected to the pixel electrode, is used to output the data signal to the pixel electrode during the display period and to output the first pulse scanning signal to the pixel electrode during the touch period;

[0030] A common voltage circuit, connected to the first common electrode block, the second common electrode block, and the third common electrode block, is used to output the common electrode voltage to the corresponding first common electrode block during the display period, and to output the second pulse scan signal or the third pulse scan signal to the corresponding common electrode block during the touch period;

[0031] Multiple negative feedback adjustment circuits are respectively connected to the first common electrode block, the second common electrode block and the third common electrode block, and are used to convert the capacitance change value output by the corresponding common electrode block into a voltage signal;

[0032] Multiple analog-to-digital converters are connected to multiple negative feedback adjustment circuits to convert the corresponding voltage signals into digital signals.

[0033] The processor is connected to multiple switches, the source drive circuit, the common voltage circuit, and the analog-to-digital converter. The processor is used to determine the touch position based on the digital signal and output the first level signal or the second level signal accordingly.

[0034] Optionally, the processor is specifically used for:

[0035] During the touch period, the first level signal is output first, and the source driving circuit is controlled to output the first pulse scanning signal and the common voltage circuit is controlled to output the second pulse scanning signal, and the digital signal is acquired.

[0036] The touch position is determined based on the digital signal;

[0037] When the touch position is detected to be not the location of the first common electrode block in the edge row or column of the touch display panel, the digital signal is reported;

[0038] When the touch position is detected to be the location of the first common electrode block in the edge row or column of the touch display panel, the output of the corresponding second level signal is switched, and the third pulse scan signal is output to the plurality of pixel electrodes corresponding to each of the second common electrode blocks in the adjacent row or column of the touch position.

[0039] Optionally, the driving circuit further includes:

[0040] Multiple capacitor compensation circuits are provided, each of which is connected to a negative feedback adjustment circuit. The capacitor compensation circuit is used to output a compensation capacitor to offset part of the capacitor change value when a compensation control signal is received.

[0041] The processor is also used for:

[0042] When the touch position is detected to be the location of the first common electrode block in the edge row or column of the touch display panel, the second level signal and the third pulse scan signal are switched to be output to the plurality of pixel electrodes corresponding to each of the second common electrode blocks in the adjacent row or column of the touch position, and the compensation control signal is output to the target capacitance compensation circuit. The target capacitance compensation circuit is the capacitance compensation circuit corresponding to the second common electrode block in the row other than the current row of the touch position, or the capacitance compensation circuit corresponding to the second common electrode block in the column other than the current column of the touch position.

[0043] Optionally, the negative feedback adjustment circuit includes a first capacitor, a resistor, and an operational amplifier;

[0044] The first end of the resistor and the first end of the first capacitor are connected to form the input terminal of the negative feedback adjustment circuit. The second end of the resistor is connected to the non-inverting input terminal of the operational amplifier. The inverting input terminal of the operational amplifier, the output terminal of the operational amplifier, and the second end of the first capacitor are connected to form the output terminal of the negative feedback adjustment circuit.

[0045] The capacitor compensation circuit includes a switching switch and a compensation capacitor. The first end of the switching switch is connected to the non-inverting input of the operational amplifier, the second end of the switching switch is connected to the first end of the compensation capacitor, and the second end of the compensation capacitor is grounded.

[0046] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The above-mentioned touch display panel includes an array of first common electrode blocks and multiple switches. The first common electrode blocks located in the edge row or edge column are composed of second common electrode blocks and third common electrode blocks arranged side by side. At the same time, the second common electrode blocks and the third common electrode blocks are connected by switches. When the first common electrode blocks at the edge of the touch display panel are not touched, the switches receive a first level signal and connect the second common electrode blocks and the third common electrode blocks to form a complete first common electrode block. When the first common electrode blocks at the edge of the touch display panel are touched, the switches receive a second level signal and disconnect. The second common electrode blocks and the third common electrode blocks form two separate rows or two columns of common electrode blocks, thereby providing additional touch data from one or both sides when touching the edge, and using it as reference data for the touch point, thus improving the accuracy of touch position determination. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the touch display panel provided in Embodiment 1 of the present invention;

[0048] Figure 2 This is a schematic diagram of the structure of the touch display panel provided in Embodiment 2 of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of a pixel unit provided in Embodiment 1 of the present invention;

[0050] Figure 4 This is a waveform diagram of each signal provided in Embodiment 2 of the present invention;

[0051] Figure 5 This is a schematic diagram of the signal waveform when a non-edge area is touched, as provided in Embodiment 2 of the present invention;

[0052] Figure 6 This is a schematic diagram of the signal waveform when the edge area is touched, as provided in Embodiment 2 of the present invention;

[0053] Figure 7This is a schematic diagram of the first structure of the display device provided in Embodiment 2 of the present invention;

[0054] Figure 8 This is a schematic diagram of the equivalent capacitance corresponding to the touch position provided in Embodiment 2 of the present invention;

[0055] Figure 9 This is a schematic diagram of a second structure of the display device provided in Embodiment 2 of the present invention;

[0056] Figure 10 This is a schematic diagram of the equivalent capacitance corresponding to the non-touch position provided in Embodiment 2 of the present invention;

[0057] Figure 11 This is a circuit diagram of the negative feedback adjustment circuit and capacitor compensation circuit provided in Embodiment 2 of the present invention.

[0058] The figures in the diagram are labeled as follows:

[0059] 100. Touch display panel; 200. Driving circuit; 110. Display area; 120. Non-display area; 10. First common electrode block; 11. Second common electrode block; 12. Third common electrode block; 21. Pixel electrode; 210. Source driving circuit; 220. Common voltage circuit; 230. Negative feedback adjustment circuit; 240. Analog-to-digital converter; 250. Processor; 260. Capacitor compensation circuit;

[0060] C1, Touch capacitance data; C2, Liquid crystal data for pixel electrodes and common electrodes; C3, Coupling capacitance data; C4, Compensation capacitor; C11, First capacitor; R0, Line impedance; R1, Resistance;

[0061] Q1, switch; K1, toggle switch; T1, thin-film transistor; Vcom, common electrode voltage; Da, data signal; Clk1, first pulse scan signal; Clk2, second pulse scan signal; Clk3, third pulse scan signal; INT, interrupt signal. Detailed Implementation

[0062] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0063] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] Example 1

[0065] A first aspect of this invention provides a touch display panel 100, such as... Figure 1 As shown, the touch display panel 100 includes:

[0066] Multiple first common electrode blocks 10 arranged in an array are multiplexed as touch sensing electrodes. The first common electrode blocks 10 located in the edge row are composed of second common electrode blocks 11 and third common electrode blocks 12 arranged side by side along the column direction. The first common electrode blocks 10 located in the edge column are composed of second common electrode blocks 11 and third common electrode blocks 12 arranged side by side along the row direction.

[0067] Multiple switches Q1 are connected between a second common electrode block 11 and a third common electrode block 12 corresponding to a first common electrode block 10. The switches Q1 are triggered to turn on when the touch display panel 100 is in a first trigger state and triggered to turn off when the touch display panel 100 is in a second trigger state and receives a second level signal.

[0068] The first trigger state is: the first common electrode block 10 of the edge row or column of the touch display panel 100 has no touch action;

[0069] The second trigger state is: the first common electrode block 10 of the edge row or column of the touch display panel 100 has a touch action.

[0070] In this embodiment, the touch display panel 100 includes an array substrate, a liquid crystal layer, and a color filter substrate, such as Figure 3 As shown, the array substrate includes pixel units 20, data lines and scan lines arranged in an array. Each pixel unit 20 is connected to a corresponding data line and a scan line. Each pixel unit 20 is composed of a thin-film transistor T1 and a pixel electrode 21. The input terminal of the thin-film transistor T1 is connected to the data line, the output terminal of the thin-film transistor T1 is connected to the pixel electrode 21, and the control terminal of the thin-film transistor T1 is connected to the scan line.

[0071] The color filter substrate includes a color filter layer and a common electrode layer. The common electrode layer is divided into multiple first common electrode blocks 10. Pixel electrodes 21 are disposed opposite to the common electrode layer to form a liquid crystal capacitor Clc. Figure 4As shown, during the display period t1, the scan line inputs a line scan signal and turns on the thin film transistor T1. The data signal Da input from the data line is transmitted to the pixel electrode 21 through the thin film transistor T1. The common electrode layer inputs a common electrode voltage Vcom. The data signal Da and the common electrode voltage Vcom form a driving voltage and drive the liquid crystal to deflect.

[0072] During the touch control period t2, each first common electrode block 10 receives a square wave or sine wave pulse scanning signal. The first common electrode block 10 is multiplexed as a touch sensing electrode. The electrode forms a self-capacitance with ground or finger. When a finger touches the corresponding position of the first common electrode block 10, the capacitance value generated by the first common electrode block 10 changes, and the corresponding capacitance data is output to the corresponding processing circuit. The processing circuit identifies the touch coordinates and reports the point by recognizing the change value of the capacitance of each first common electrode block 10.

[0073] To improve the accuracy of edge touch coordinate recognition, the first common electrode block 10 is divided according to different positions. Specifically, the first common electrode block 10 located at the edge of the touch display panel 100 is divided into a second common electrode block 11 and a third common electrode block 12. The second common electrode block 11 and the third common electrode block 12 are connected by a switch Q1. When the switch Q1 is on, the second common electrode block 11 and the third common electrode block 12 form a common electrode block of the same size as the first common electrode block 10 in the non-edge area. When the switch Q1 is off, the second common electrode block 11 and the third common electrode block 12 form two separate common electrode blocks. The size of the second common electrode block 11 and the third common electrode block 12 is smaller than the size of the first common electrode block 10.

[0074] For example Figure 1 As shown, assuming the first common electrode blocks 10 are arranged in an M-row N-column array, each of the first common electrode blocks 10 in the first column and / or the Nth column is divided into a second common electrode block 11 and a third common electrode block 12, thereby forming a second common electrode block 11 in two columns and a third common electrode block 12 in two columns at the edge, and / or, each of the first common electrode blocks 10 in the first row and the Mth row is divided into a second common electrode block 11 and a third common electrode block 12, thereby forming a second common electrode block 11 in two rows and a third common electrode block 12 in two columns at the edge.

[0075] The adjacent second common electrode blocks 11 and third common electrode blocks 12 at the edge positions are arranged in a corresponding direction according to their positions. Specifically, the second common electrode blocks 11 and third common electrode blocks 12 of the first common electrode blocks 10 in the first column and / or the Nth column are arranged side-by-side at intervals along the row direction, i.e., at intervals along the horizontal direction of the touch display panel 100. The second common electrode blocks 11 and third common electrode blocks 12 of the first common electrode blocks 10 in the first row and / or the Mth row are arranged at intervals along the column direction, i.e., at intervals along the horizontal direction of the touch display panel 100. When multiple first common electrode blocks 10 are evenly distributed in the edge row and edge column, the second common electrode blocks 11 and third common electrode blocks 12 of the overlapping first common electrode blocks 10 can be arranged side by side with intervals along the row or column direction as needed. For example, when the first common electrode blocks 10 in the first row and first column are evenly distributed, the second common electrode blocks 11 and third common electrode blocks 12 in the first common electrode blocks 10 in the first row and first column can be arranged side by side with intervals along either the row or column direction.

[0076] The touch display panel 100 can be divided into different touch states according to the touch position when it is touched. When the first common electrode block 10 at the non-edge position of the touch display panel 100 is touched, the touch display panel 100 presents the first touch state. At this time, the corresponding driving circuit 200 or processor 250 outputs a first level signal to the switch Q1. The switch Q1 is turned on and connects the second common electrode block 11 and the third common electrode block 12 in each edge area. The second common electrode block 11 and the third common electrode block 12 form a common electrode block of the same size as the first common electrode block 10 in the non-edge area. The corresponding driving circuit 200 or processor 250 determines the touch coordinates according to the touch data of each first common electrode block 10. The first common electrode block 10 is arranged around one or more first common electrode blocks 10 in the non-edge area and can provide reference data respectively. The corresponding driving circuit 200 or processor 250 can determine the touch coordinates according to the reference data and the corresponding peak data and report the coordinate points.

[0077] When the edge of the touch display panel 100 is touched, the touch display panel 100 enters a second touch state. At this time, the corresponding driving circuit 200 or processor 250 outputs a second level signal to switch Q1. Switch Q1 turns off and disconnects the second common electrode block 11 and the third common electrode block 12 in each edge area. The second common electrode block 11 and the third common electrode block 12 then form two independent and separate common electrode blocks, thereby adding an extra row or column of common electrode blocks, and adding an extra row or column of touch data when touched. The corresponding driving circuit 200 or processor 250 then adjusts the signal according to the first common electrode block 100. The touch coordinates are determined by the touch data of the second common electrode block 11 and the third common electrode block 12. The corresponding second common electrode block 11 or the third common electrode block 12 in the edge area are surrounded by common electrode blocks, which can provide reference data respectively. The corresponding driving circuit 200 or processor 250 can determine the touch coordinates based on the reference data and the corresponding peak data, and report the coordinate points. The corresponding driving circuit 200 and processor 250 can determine the touch data of the edge position without performing the pull-up algorithm, which improves the accuracy of touch position determination and reduces the data processing work of the corresponding driving circuit 200 and processor 250.

[0078]

[0079] Table 1

[0080]

[0081] Table 2

[0082] As shown in Table 1 above, when a finger touches multiple first common electrode blocks 10 in rows 28 to 31 of the first column of the touch display panel 100, the corresponding driving circuit 200 or processor 250 outputs a second-level signal to multiple switches Q1 in the first column. The multiple first common electrode blocks 10 in the first column are then divided into a column of second common electrode blocks 11 and a column of third common electrode blocks 12, as shown in Table 2. The column of second common electrode blocks 11 is located in column 0 (Ch), and the column of third common electrode blocks 12 is located in column 1 (ChY01). The third common electrode block 12 is equivalent to the original first common electrode block. The electrode block 10 provides touch data 75, 815, 1454, and 383, while the second common electrode block 11 provides an additional set of data 2, 303, 623, and 169. The third common electrode block 12 is surrounded by corresponding common electrode blocks. When touched, each of the first common electrode block 10, the second common electrode block 11, and the third common electrode block 12 can transmit touch data to the corresponding driving circuit 200 or processor 250. The corresponding driving circuit 200 or processor 250 can determine the touch coordinates based on the surrounding reference data and the corresponding peak data, and report the coordinate points.

[0083] The switch Q1 can be set at a corresponding position on the touch display panel 100 according to requirements such as panel aperture ratio and light transmittance. In an optional embodiment, such as... Figure 1 As shown, the touch display panel 100 includes a display area 110 and a non-display area 120 surrounding the display area 110;

[0084] The first common electrode block 10 of the array is located in the display area 110;

[0085] Multiple switches Q1 are located in the non-display area 120.

[0086] In this embodiment, the pixel unit 20 located in the display area 110 of the array substrate and the common electrode block located in the display area 110 of the color filter substrate form a liquid crystal capacitor Clc, and drive the liquid crystal to deflect to realize the display operation.

[0087] Meanwhile, multiple switches Q1 are set in the non-display area 120 of the color filter substrate, which does not affect the light transmittance of the liquid crystal. At the same time, they do not occupy the position of the first common electrode block 10, and more first common electrode blocks 10 can be set to improve touch accuracy.

[0088] The first common electrode block 10 at the edge can be divided into blocks on one side, both sides, or all four sides. In an optional embodiment, such as... Figure 1 As shown, the first common electrode block 10 is arranged in an M-row N-column array;

[0089] The second common electrode block 11 and the third common electrode block 12 of the first common electrode block 10 in the first column and the Nth column are arranged side by side along the row direction, and the second common electrode block 11 and the third common electrode block 12 of the first common electrode block 10 in the second column to the N-1th column of the first row are arranged side by side along the column direction;

[0090] Alternatively, the second common electrode block 11 and the third common electrode block 12 of the first common electrode block 10 in the first row are arranged side by side along the column direction, the second common electrode block 11 and the third common electrode block 12 of the first common electrode block 10 in the second row to the Mth row of the first column are arranged side by side along the row direction, and the second common electrode block 11 and the third common electrode block 12 of the first common electrode block 10 in the second row to the Mth row of the Nth column are arranged side by side along the row direction.

[0091] In this embodiment, the touch display panel 100 includes a first side, a second side, a third side, and a fourth side. The first and second sides are arranged opposite to each other, and the third and fourth sides are arranged opposite to each other. A plurality of first common electrode blocks 10 in the first column are arranged close to the first side, a plurality of second common electrode blocks 11 in the Nth column are arranged close to the second side, a plurality of first common electrode blocks 10 in the first row are arranged close to the third side, and a plurality of first common electrode blocks 10 in the Mth row are arranged close to the third side. The plurality of first common electrode blocks 10 in the first column, the plurality of second common electrode blocks 11 in the Nth column, and the plurality of first common electrode blocks 10 in the first row are divided into second common electrode blocks 11 and third common electrode blocks 12, while the plurality of first common electrode blocks 10 in the second to N-1th columns of the Mth row are not divided into blocks. Figure 2 As shown, the fourth side is used to bond the corresponding drive circuit 200.

[0092] Furthermore, the second common electrode blocks 11 and the third common electrode blocks 12 in the multiple first common electrode blocks 10 in the second row to the M row of the first column are arranged side by side along the row direction, the second common electrode blocks 11 and the third common electrode blocks 12 in the multiple first common electrode blocks 10 in the second row to the M row of the N column are arranged side by side along the row direction, and the second common electrode blocks 11 and the third common electrode blocks 12 in the multiple first common electrode blocks 10 in the second column to the N-1 column of the first row are arranged side by side along the column direction. Among them, the second common electrode blocks 11 are arranged close to the side, that is, each second common electrode block 11 is arranged close to the edge of the display area 110.

[0093] When the edge of the touch display panel 100 is touched, the switch Q1 is turned off. The second common electrode block 11 and the third common electrode block 12 at the edge position are set in blocks. An additional row of second common electrode blocks 11 can be added along the column direction, and two additional columns of second common electrode blocks 11 can be added along the row direction. Additional touch data can be provided to improve the accuracy of touch position determination.

[0094] When the second common electrode block 11 and the third common electrode block 12 are combined, they have the same size as the first common electrode block 10 in the non-edge position. That is, the total length or total width of the second common electrode block 11 and the third common electrode block 12 is equal to the length and width of the first common electrode block 10 in the non-edge region.

[0095] When the first common electrode block 10 is divided into blocks, in order to increase the touch area at the edge position while taking into account the touch data, in an optional embodiment, the size of the second common electrode block 11 is less than or equal to the size of the third common electrode block 12. Setting the size of the third common electrode block 12 to be larger can increase the touch area at the edge position and provide more accurate touch data.

[0096] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The touch display panel 100 includes an array of first common electrode blocks 10 and a plurality of switches Q1. The first common electrode blocks 10 located in the edge row or edge column are composed of second common electrode blocks 11 and third common electrode blocks 12 arranged side by side. At the same time, the second common electrode blocks 11 and third common electrode blocks 12 are connected through switches Q1. When the first common electrode blocks 10 at the edge of the touch display panel 100 are not touched, the switches Q1 receive a first level signal and connect the second common electrode blocks 11 and third common electrode blocks 12 to form a complete first common electrode block 10. When the first common electrode blocks 10 at the edge of the touch display panel 100 are touched, the switches Q1 receive a second level signal and disconnect. The second common electrode blocks 11 and third common electrode blocks 12 form two separate rows or two columns of common electrode blocks, thereby providing additional touch data from one or both sides when touching the edge, and using it as reference data for the touch point, thus improving the accuracy of touch position determination.

[0097] Example 2

[0098] Corresponding to the aforementioned touch display panel 100, such as Figure 2 As shown, a second aspect of the present invention provides a display device, which includes a driving circuit 200 and a touch display panel 100. The specific structure of the touch display panel 100 is as described in the above embodiments. Since the touch display panel 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0099] The driving circuit 200 is connected to multiple switches Q1, multiple first common electrode blocks 10, multiple second common electrode blocks 11 and third common electrode blocks 12 of the touch display panel 100;

[0100] Drive circuit 200, used for:

[0101] When no touch action is detected on the first common electrode block 10 of the edge row or column of the touch display panel 100, multiple first level signals are output to multiple switches Q1;

[0102] And when the first common electrode block 10 of the edge row or column of the touch display panel 100 is detected to have a touch action, multiple second level signals are output to multiple switches Q1.

[0103] In this embodiment, as Figure 4As shown, during the touch period t2, the driving circuit 200 outputs a square wave or sine wave pulse scanning signal to each first common electrode block 10. The electrodes and ground or fingers form a self-capacitance. When a finger touches the first common electrode block 10 at the corresponding position, the capacitance value generated by the first common electrode block 10 changes, and the corresponding capacitance data is output to the corresponding driving circuit 200. The driving circuit 200 identifies and determines the touch coordinates and reports the point by recognizing the change value of the capacitance of each first common electrode block 10.

[0104] Simultaneously, during the touch period t2, the driving circuit 200 determines the touch position of the touch display panel 100 based on the touch data and point obtained the first time. When the first common electrode block 10 at the non-edge position of the touch display panel 100 is detected to be touched, the driving circuit 200 outputs a first level signal to the switch Q1 of the touch display panel 100. The switch Q1 is turned on and connects the second common electrode block 11 and the third common electrode block 12 in each edge area. The second common electrode block 11 and the third common electrode block 12 form a common electrode block of the same size as the first common electrode block 10 in the non-edge area. The driving circuit 200 determines the touch coordinates based on the touch data of each first common electrode block 10. The first common electrode block 10 is arranged around one or more first common electrode blocks 10 in the non-edge area and can provide reference data respectively. The driving circuit 200 can determine the touch coordinates based on the reference data and the corresponding peak data and report the coordinate points.

[0105] When a touch is detected at the edge of the touch display panel 100, the driving circuit 200 outputs a second-level signal to the switch Q1. The switch Q1 turns off and disconnects the second common electrode block 11 and the third common electrode block 12 in each edge area. The second common electrode block 11 and the third common electrode block 12 then form two independent common electrode blocks, thereby adding an extra row or column of common electrode blocks, and adding an extra row or column of touch data when touched. The driving circuit 200 then adjusts the signal according to the first common electrode block 10, the second common electrode block 11, and the third common electrode block 12. The touch coordinates are determined by the touch data of the second common electrode block 11 and the third common electrode block 12. The edge area is surrounded by common electrode blocks, which can provide reference data respectively. The driving circuit 200 can determine the touch coordinates based on the reference data and the corresponding peak data, and report the coordinate points. The driving circuit 200 can determine the touch data of the edge position without performing the pull-up algorithm, which improves the accuracy of touch position determination and reduces the data processing work of the corresponding driving circuit 200 and processor 250.

[0106] The touch display panel 100 operates during display period t1 and touch period t2. During display period t1, the driving circuit 200 outputs a line scan signal to the scan line of the touch display panel 100 and turns on the thin film transistor T1 of the pixel unit 20. At the same time, it outputs a data signal Da to the data line of the touch display panel 100. The input data signal Da is transmitted to the pixel electrode 21 through the thin film transistor T1. Meanwhile, the driving circuit 200 also outputs a common electrode voltage Vcom to the common electrode layer. The data signal Da and the common electrode voltage Vcom form a driving voltage and drive the liquid crystal to deflect.

[0107] In an optional embodiment, to provide additional reference data, the drive circuit 200 is further configured to:

[0108] During the touch period t2, when no touch action is detected on the first common electrode block 10 of the edge row or column of the touch display panel 100, a corresponding first level signal is output, as well as a first pulse scan signal Clk1 is output to the pixel electrode 21 and a second pulse scan signal Clk2 is output to the first common electrode block 10. The voltage amplitudes of the first pulse scan signal Clk1 and the second pulse scan signal Clk2 are the same.

[0109] During the touch period t2, when a touch action is detected in the first common electrode block 10 of the edge row or column of the touch display panel 100, a corresponding second level signal is output, and a third pulse scan signal Clk3 is output to the multiple pixel electrodes 21 corresponding to each second common electrode block 11 in the row or column adjacent to the touch position. The voltage of the third pulse scan signal Clk3 is greater than the voltage of the first pulse scan signal Clk1.

[0110] In this embodiment, as Figure 5 As shown, INT is the interrupt signal generated during touch. When no touch action is detected on the first common electrode block 10 of the edge row or column of the touch display panel 100, that is, when touch action is detected on the first common electrode block 10 of the non-edge area of ​​the touch display panel 100, the driving circuit 200 outputs a first level signal to control the switch Q1 to turn on and connect the second common electrode block 11 and the third common electrode block 12 of the edge area, so that the display panel 100 has multiple first common electrode blocks 10 of the same size. At the same time, a first pulse scanning signal Clk1 with equal voltage amplitude is output to the pixel electrode 21 and a second pulse scanning signal Clk2 is output to the first common electrode block 10 to form a liquid crystal capacitor Clc. Since the voltage amplitude is equal, the size of the liquid crystal capacitor Clc remains unchanged and does not affect the liquid crystal deflection.

[0111] And when a touch action is detected on the first common electrode block 10 of the edge row or column of the touch display panel 100, a corresponding second level signal is output, the switch Q1 of the touched edge area is turned off, and the second common electrode block 11 and the third common electrode block 12 of the edge area are separated. At this time, the third common electrode block 12 replaces the original first common electrode block 10 to realize touch data output. At the same time, in order to make the second common electrode block 11 located in the edge area generate corresponding capacitance data, such as Figure 6 As shown, the driving circuit 200 also outputs a third pulse scanning signal Clk3 to the pixel electrode 21 corresponding to the touched second common electrode block 11. For example, if the left edge is touched, the pixel electrode 21 corresponding to the second common electrode block 11 in the first column on the left receives the third pulse scanning signal Clk3 output by the driving circuit 200. The pixel electrode 21 couples with the second common electrode block 11 and generates a coupling capacitance value, as shown in Table 1 above. The second common electrode block 11 provides an additional set of data through coupling, and the third common electrode block 12 is still surrounded by corresponding common electrode blocks. When touched, each of the first common electrode block 10, the second common electrode block 11, and the third common electrode block 12 can transmit touch data to the corresponding driving circuit 200 or processor 250. The driving circuit 200 can determine the touch coordinates based on the reference data around and the corresponding peak data, and report the coordinate points.

[0112] The driving circuit 200 can be configured according to the output signal type and data processing requirements. In one optional embodiment, such as... Figure 7 As shown, the driving circuit 200 includes:

[0113] The source drive circuit 210 is connected to the pixel electrode 21 and is used to output a data signal Da to the pixel electrode 21 during the display period t1 and to output a first pulse scan signal Clk1 to the pixel electrode 21 during the touch period t2.

[0114] The common voltage circuit 220 is connected to the first common electrode block 10, the second common electrode block 11 and the third common electrode block 12, and is used to output the common electrode voltage Vcom to the corresponding first common electrode block 10 during the display period t1, and to output the second pulse scan signal Clk2 or the third pulse scan signal Clk3 to the corresponding common electrode block during the touch period t2.

[0115] Multiple negative feedback adjustment circuits 230 are respectively connected to the first common electrode block 10, the second common electrode block 11 and the third common electrode block 12, and are used to convert the capacitance change value output by the corresponding common electrode block into a voltage signal.

[0116] Multiple analog-to-digital converters 240 are connected to multiple negative feedback regulation circuits 230 one by one to convert the corresponding voltage signals into digital signals;

[0117] The processor 250 is connected to multiple switches Q1, a source drive circuit 210, a common voltage circuit 220, and an analog-to-digital converter 240. The processor 250 is used to determine the touch position based on the digital signal and output a first level signal or a second level signal accordingly.

[0118] In this embodiment, the driving circuit 200 may further include a gate driving circuit 200, which is connected to the scan lines of the touch display panel 100. During the display period t1, the processor 250 controls the gate driving circuit 200 to output a row scanning signal to the scan lines of the touch display panel 100 and turn on the thin film transistor T1 of the pixel unit 20. At the same time, the processor controls the source driving circuit 210 to output a data signal Da to the data line of the touch display panel 100. The input data signal Da is transmitted to the pixel electrode 21 via the thin film transistor T1. Meanwhile, the processor 250 also controls the common voltage circuit 220 to output a common electrode voltage Vcom to the common electrode block. The data signal Da and the common electrode voltage Vcom form a driving voltage and drive the liquid crystal to deflect.

[0119] During the touch period t2, the processor 250 determines the touch position of the touch display panel 100 based on the touch data and point obtained the first time. When the first common electrode block 10 at the non-edge position of the touch display panel 100 is detected to be touched, the processor 250 outputs a first level signal to the switch Q1 of the touch display panel 100. The switch Q1 is turned on and connects the second common electrode block 11 and the third common electrode block 12 in each edge area. The second common electrode block 11 and the third common electrode block 12 form a common electrode block of the same size as the first common electrode block 10 in the non-edge area. The processor 250 obtains the corresponding digital signal through the negative feedback adjustment circuit 230 and the analog-to-digital converter 240, and determines the touch coordinates according to the corresponding digital signal of each first common electrode block 10. The first common electrode block 10 is arranged around one or more first common electrode blocks 10 in the non-edge area, and reference data can be provided respectively. The processor 250 can determine the touch coordinates according to the reference data and the corresponding peak data, and report the coordinate points.

[0120] When the edge of the touch display panel 100 is detected to be touched, the processor 250 outputs a second level signal to the switch Q1. The switch Q1 turns off and disconnects the second common electrode block 11 and the third common electrode block 12 in each edge area. The second common electrode block 11 and the third common electrode block 12 then form two independent and separate common electrode blocks, thereby adding an extra row or column of common electrode blocks and an extra row or column of digital signals when touched. The processor 250 determines the touch coordinates based on the digital signals of each first common electrode block 10, second common electrode block 11 and third common electrode block 12. The corresponding one or more second common electrode blocks 11 or third common electrode blocks 12 in the edge area are surrounded by common electrode blocks, which can provide reference data respectively. The processor 250 can determine the touch coordinates based on the reference data and the corresponding peak data and report the coordinate points. The processor 250 can determine the touch data of the edge position without performing an edge-pulling algorithm, which improves the accuracy of touch position determination and reduces the data processing work of the corresponding driving circuit 200 and the processor 250.

[0121] The negative feedback regulation circuit 230 converts the capacitance change value into a voltage signal, and the analog-to-digital converter 240 converts the analog signal into a digital signal.

[0122] In order to determine the specific touch location, in one optional embodiment, the processor 250 is specifically used for:

[0123] During the touch period t2, a first level signal is first output, and the source drive circuit 210 is controlled to output a first pulse scan signal Clk1 and the common voltage circuit 220 is controlled to output a second pulse scan signal Clk2, and digital signals are acquired.

[0124] The touch position is determined based on digital signals;

[0125] When the detected touch position is not the location of the first common electrode block 10 of the edge row or column of the touch display panel 100, a digital signal is reported;

[0126] When the touch position is detected to be the location of the first common electrode block 10 of the edge row or column of the touch display panel 100, the corresponding second level signal is switched to be output, and the third pulse scan signal Clk3 is output to the multiple pixel electrodes 21 corresponding to each second common electrode block 11 in the adjacent row or column of the touch position.

[0127] In this embodiment, during the touch control period t2, the processor 250 first outputs a first level signal to control each switch Q1 to be turned on, the second common electrode block 11 and the third common electrode block 12 form a whole first common electrode block 10, and controls the source drive circuit 210 to output a first pulse scan signal Clk1 to the pixel electrode 21, and controls the common voltage circuit 220 to output a second pulse scan signal Clk2 to each first common electrode block 10, and obtains the digital signal of each first common electrode block 10, and determines the touch position according to the change of the digital signal.

[0128] When determining the touch position, the corresponding output level signal and pulse signal are selected to switch Q1 and pixel electrode 21. When the touch position is not detected to be the position of the first common electrode block 10 of the edge row or column of the touch display panel 100, that is, when the first common electrode block 10 in the non-edge area is touched, other first common electrode blocks 10 are arranged around each touched first common electrode block 10. There is no need to switch the state of switch Q1 again, and the coordinate point obtained for the first time can be reported.

[0129] Alternatively, when the touch position is detected to be in the edge area of ​​the touch display panel 100, the processor 250 controls the source drive circuit 210 to output a third pulse scan signal Clk3 to the corresponding edge row or edge column. For example, when the first common electrode block 10 on the left edge is touched, the source drive circuit 210 outputs a third pulse signal to the pixel electrode 21 corresponding to each second common electrode block 11 in the first column. The second common electrode block 11 is coupled with corresponding capacitance data. The capacitance data is converted into corresponding digital signals through the negative feedback adjustment circuit 230 and the analog-to-digital converter 240. The processor 250 can determine the touch coordinates based on the coupled reference data and the corresponding peak data, and report the coordinate points.

[0130] like Figure 8 As shown, the total capacitance data output by the first common electrode block 10 in the edge region includes touch capacitance data C1 generated by finger touch, liquid crystal capacitance data C2 of pixel electrode 21 and common electrode, and coupling capacitance data C3 increased when the third pulse scan signal Clk3 is applied. Here, R0 represents the line impedance of the connecting line. The negative feedback adjustment circuit 230 converts the total capacitance data into a voltage signal, and then converts it into a digital signal via analog-to-digital converter 240.

[0131] Since all second common electrode blocks 11 of the entire edge row or all second common electrode blocks 11 of the edge column are coupled when the third scan pulse signal is applied, some data may exceed the peak data of the original touch position. Therefore, in order to eliminate the data influence of non-touch rows, the capacitance data of the second common electrode blocks 11 of the non-touch rows can be compensated. In an optional embodiment, such as... Figure 9 As shown, the drive circuit 200 also includes:

[0132] Multiple capacitor compensation circuits 260 are provided, each capacitor compensation circuit 260 is connected to a negative feedback adjustment circuit 230, and the capacitor compensation circuit 260 is used to output a compensation capacitor to offset part of the capacitance change value when a compensation control signal is received.

[0133] Processor 250 is also used for:

[0134] When the touch position is detected to be the position of the first common electrode block 10 of the edge row or column of the touch display panel 100, the corresponding second level signal and the third pulse scan signal Clk3 are switched to the multiple pixel electrodes 21 corresponding to each second common electrode block 11 in the row or column adjacent to the touch position, and the compensation control signal is output to the target capacitance compensation circuit 260. The target capacitance compensation circuit 260 is the capacitance compensation circuit 260 corresponding to the second common electrode block 11 in other rows except the current row of the touch position, or the capacitance compensation circuit 260 corresponding to the second common electrode block 11 in other columns except the current column of the touch position.

[0135] In this embodiment, taking Table 2 as an example, as follows: Figure 10 As shown, when the touch position is row 29 to row 31 of the first column, the processor 250 first outputs a second level signal to control the switches Q1 corresponding to the first column to turn off. At the same time, it outputs a third pulse signal to the multiple pixel electrodes 21 corresponding to the second common electrode block 11 of the first column and capacitively couples the multiple second common electrode blocks 11 of the first column. At this time, the capacitance data of the second common electrode blocks 11 of the entire first column increases. At the same time, the processor 250 also outputs a compensation control signal to the capacitance compensation circuit 260 connected to the second common electrode blocks 11 other than row 29 to row 31. For example, the capacitance compensation circuit 260 connected to the second common electrode blocks 11 corresponding to row 1 to row 28 of the first column receives the compensation control signal and outputs a compensation capacitor to offset the increased capacitance of the second common electrode blocks 11 corresponding to row 1 to row 28 of the first column due to coupling. This reduces the capacitance change value of the second common electrode blocks 11 corresponding to the non-touch position of row 1 to row 28 of the first column, and avoids the capacitance data of other non-adjacent second common electrode blocks 11 at the touch position from affecting the position determination accuracy.

[0136] The capacitor compensation circuit 260 can be composed of a compensation capacitor C4 and a corresponding switching circuit, such as... Figure 11 As shown, in an optional embodiment, the negative feedback adjustment circuit 230 includes a first capacitor C11, a resistor R1, and an operational amplifier U1;

[0137] The first end of resistor R1 and the first end of first capacitor C11 are connected to form the input terminal of negative feedback adjustment circuit 230. The second end of resistor R1 is connected to the non-inverting input terminal of operational amplifier U1. The inverting input terminal of operational amplifier U1, the output terminal of operational amplifier U1 and the second end of first capacitor C11 are connected to form the output terminal of negative feedback adjustment circuit 230.

[0138] The capacitor compensation circuit 260 includes a switching switch K1 and a compensation capacitor C4. The first end of the switching switch K1 is connected to the non-inverting input of the operational amplifier U1, the second end of the switching switch K1 is connected to the first end of the compensation capacitor C4, and the second end of the compensation capacitor C4 is grounded.

[0139] In this embodiment, resistor R1, first capacitor C11, and operational amplifier U1 form a transimpedance amplifier, which converts the capacitance data generated at the front end into a voltage signal. Meanwhile, the control terminal of the switching switch K1 in the capacitance compensation circuit 260 is connected to the processor 250. When the second common electrode block 11 in the corresponding row does not require capacitance compensation, the processor 250 controls the switching switch K1 to turn off. When the second common electrode block 11 in the corresponding position requires capacitance compensation, the processor 250 controls the switching switch K1 to turn on and provides compensation capacitor C4 to the non-inverting input terminal of operational amplifier U1, thereby offsetting part of the capacitance change value of the second common electrode block 11.

[0140] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A touch display panel, characterized in that, The application relates to a touch display panel, comprising: a plurality of first common electrode blocks arranged in an array, the first common electrode blocks being multiplexed as touch sensing electrodes, wherein the first common electrode blocks located in edge rows are composed of second common electrode blocks and third common electrode blocks arranged side by side in a column direction, and the first common electrode blocks located in edge columns are composed of the second common electrode blocks and the third common electrode blocks arranged side by side in a row direction; a plurality of switches, each switch being connected between the second common electrode block and the third common electrode block of a corresponding first common electrode block, the switch being triggered to turn on when receiving a first level signal when the touch display panel is in a first trigger state, and being triggered to turn off when receiving a second level signal when the touch display panel is in a second trigger state; the first trigger state being that the first common electrode blocks of the edge rows or columns of the touch display panel have no touch action; the second trigger state being that the first common electrode blocks of the edge rows or columns of the touch display panel have touch action. 2.The touch display panel of claim 1, wherein, The touch display panel comprises a display area and a non-display area arranged around the display area; the first common electrode blocks arranged in an array are located in the display area; the plurality of switches are located in the non-display area. 3.The touch display panel of claim 2, wherein, The first common electrode blocks are arranged in an M-row-by-N-column array; the second common electrode blocks and the third common electrode blocks of the first column and the Nth column of the first common electrode blocks are arranged side by side in a row direction, and the second common electrode blocks and the third common electrode blocks of the second column to the N-1th column of the first row of the first common electrode blocks are arranged side by side in a column direction; alternatively, the second common electrode blocks and the third common electrode blocks of the first row of the first common electrode blocks are arranged side by side in a column direction, the second common electrode blocks and the third common electrode blocks of the second row to the Mth row of the first column of the first common electrode blocks are arranged side by side in a row direction, and the second common electrode blocks and the third common electrode blocks of the second row to the Mth row of the Nth column of the first common electrode blocks are arranged side by side in a row direction. 4.The touch display panel of claim 2, wherein, Each second common electrode block is arranged close to an edge of the display area; the size of a second common electrode block is less than or equal to the size of a third common electrode block.

5. A display device, characterized by comprising: The application further relates to a touch display panel driving circuit, comprising a driving circuit and a touch display panel as claimed in any one of claims 1 to 4, the driving circuit being connected to the plurality of switches, the plurality of first common electrode blocks, the plurality of second common electrode blocks and the plurality of third common electrode blocks of the touch display panel; the driving circuit being configured to: output a plurality of first level signals to the plurality of switches when detecting that the first common electrode blocks of the edge rows or columns of the touch display panel have no touch action, and output a plurality of second level signals to the plurality of switches when detecting that the first common electrode blocks of the edge rows or columns of the touch display panel have touch action. The touch display panel further comprises:

6. The display device of claim 5, wherein, a plurality of pixel units arranged in an array, each pixel unit comprising a thin film transistor and a pixel electrode connected in series, the pixel electrode being arranged opposite to the common electrode blocks; the driving circuit being further configured to: ​ outputting a data signal to the pixel electrode and outputting a common electrode voltage to each of the first common electrode blocks in a display period; in a touch period, when it is detected that the first common electrode block of the edge row or column of the touch display panel has no touch action, a first level signal corresponding to the first level signal is outputted, and a first pulse scanning signal is outputted to the pixel electrode and a second pulse scanning signal is outputted to the first common electrode block, the voltage amplitude of the first pulse scanning signal and the second pulse scanning signal being the same; in a touch period, when it is detected that the first common electrode block of the edge row or column of the touch display panel has touch action, a second level signal corresponding to the second level signal is outputted, and a third pulse scanning signal is outputted to a plurality of pixel electrodes corresponding to the second common electrode blocks adjacent to the touch position in the row or column.

7. The display device of claim 6, wherein The driving circuit comprises: a source electrode driving circuit connected with the pixel electrode, configured to output the data signal to the pixel electrode in a display period and output the first pulse scanning signal to the pixel electrode in a touch period; a common voltage circuit connected with the first common electrode block, the second common electrode block and the third common electrode block, configured to output the common electrode voltage to the first common electrode block in a display period and output the second pulse scanning signal or the third pulse scanning signal to the corresponding common electrode block in a touch period; a plurality of negative feedback adjusting circuits connected with the first common electrode block, the second common electrode block and the third common electrode block respectively, configured to convert the capacitance change value outputted by the corresponding common electrode block into a voltage signal; a plurality of analog-to-digital converters connected with the plurality of negative feedback adjusting circuits one by one, configured to convert the voltage signal into a digital signal; a processor connected with the plurality of switches, the source electrode driving circuit, the common voltage circuit and the analog-to-digital converter respectively, the processor being configured to determine the touch position according to the digital signal and output the first level signal or the second level signal correspondingly.

8. The display device of claim 7, wherein, The processor is specifically configured to: in a touch period, output the first level signal first, control the source electrode driving circuit to output the first pulse scanning signal and control the common voltage circuit to output the second pulse scanning signal, and acquire the digital signal; determine the touch position according to the digital signal; when it is detected that the touch position is not the position of the first common electrode block of the edge row or column of the touch display panel, report the digital signal; when it is detected that the touch position is the position of the first common electrode block of the edge row or column of the touch display panel, switch to output the second level signal corresponding to the second level signal and output a third pulse scanning signal to a plurality of pixel electrodes corresponding to the second common electrode blocks adjacent to the touch position in the row or column.

9. The display device of claim 8, wherein, The driving circuit further comprises: A plurality of capacitance compensation circuits, each of the capacitance compensation circuits being connected with one of the negative feedback regulating circuits, the capacitance compensation circuit being configured to output a compensation capacitance to offset part of the capacitance variation value when receiving a compensation control signal; The processor is further configured to: When detecting that the touch position is located at the position of the first common electrode block of the edge row or column of the touch display panel, switch output of the second level signal and output of a third pulse scanning signal to a plurality of pixel electrodes corresponding to the second common electrode blocks adjacent to the touch position, and output the compensation control signal to a target capacitance compensation circuit, the target capacitance compensation circuit being a capacitance compensation circuit corresponding to the second common electrode block of a row other than the current row of the touch position, or a capacitance compensation circuit corresponding to the second common electrode block of a column other than the current column of the touch position.

10. The display device of claim 9, wherein, The negative feedback regulating circuit comprises a first capacitor, a resistor and an operational amplifier; A first end of the resistor and a first end of the first capacitor are connected to form an input end of the negative feedback regulating circuit, a second end of the resistor and a non-inverting input end of the operational amplifier are connected, and an inverting input end of the operational amplifier, an output end of the operational amplifier and a second end of the first capacitor are connected to form an output end of the negative feedback regulating circuit; The capacitance compensation circuit comprises a switching switch and a compensation capacitor, a first end of the switching switch is connected with a non-inverting input end of the operational amplifier, a second end of the switching switch is connected with a first end of the compensation capacitor, and a second end of the compensation capacitor is grounded.

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