Touch display device and touch detection method

Abstract

The embodiment of the present application provides a touch display device and a touch detection method, relates to the touch technology field, and effectively improves touch detection precision while reducing cost and simplifying architecture. The touch display device comprises: a touch display panel, comprising at least one touch area, comprising a plurality of touch structures, the touch structure comprising a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction; the first touch electrode comprises a plurality of first electrode blocks arranged along the second direction, and adjacent two first electrode blocks are communicated through a connecting portion; one first touch electrode is electrically connected with one touch signal line; the second touch electrode comprises a plurality of second electrode blocks arranged along the first direction, and the plurality of second electrode blocks in one second touch electrode are electrically connected with one touch signal line; at least one touch driving chip, one touch driving chip is electrically connected with the touch signal line connected with the touch structure in one touch area.

Description

Technical Field

[0001] This invention relates to the field of touch technology, and more specifically to a touch display device and a touch detection method. Background Technology

[0002] Currently, touch functionality has become a standard feature in most display devices. Touch display devices typically employ capacitive touch, infrared touch, and resistive touch. Among these, capacitive touch has gained wider application due to its superior characteristics, such as the ability to achieve multi-touch.

[0003] Capacitive touch technology includes external touchscreens and embedded touchscreens. Embedded touchscreens, also known as in-cell touchscreens, embed the touch panel inside the liquid crystal display panel, giving the liquid crystal display panel both display and touch functions. However, existing embedded touchscreen display devices, especially large-size touchscreen display devices, have a large number of touch channels and require a large number of touch driver chips, resulting in higher costs and wider bezels. Summary of the Invention

[0004] In view of this, this application provides a touch display device and a touch detection method, which effectively improves the touch detection accuracy while reducing costs and simplifying the architecture.

[0005] In a first aspect, embodiments of this application provide a touch display device, including:

[0006] A touch display panel, the touch display panel including at least one touch area, the touch area including multiple touch structures, the touch structure including multiple first touch electrodes arranged along a first direction and multiple second touch electrodes arranged along a second direction, the first touch electrodes and the second touch electrodes being in the same layer and insulated from each other, the first direction intersecting the second direction;

[0007] The first touch electrode includes a plurality of first electrode blocks arranged along the second direction, and two adjacent first electrode blocks are connected by a connecting part. One first touch electrode is electrically connected to a touch signal line. The second touch electrode includes a plurality of second electrode blocks arranged along the first direction, and a plurality of second electrode blocks in one second touch electrode are electrically connected to the touch signal line.

[0008] At least one touch driver chip, and one of the touch driver chips is electrically connected to a touch signal line connected to the touch structure in one of the touch areas.

[0009] In this embodiment of the invention, by dividing the touch display panel into regions and setting multiple independent touch structures in each divided touch region, the touch detection accuracy of the touch display device can be improved, especially the touch detection accuracy of large-size touch display devices under multi-finger touch. Specifically, each touch region includes multiple independent touch structures, and the touch driver chip can detect the touch situation in the detection area where each touch structure is located individually. When performing multi-finger touch, since the area of ​​the detection area corresponding to each touch structure is small, multiple fingers are more likely to be placed in the detection areas where different touch structures are located. Therefore, when the touch driver chip judges each detection area individually, it is easier to accurately determine the touch point coordinates of different finger touch positions, reducing the risk of misjudgment.

[0010] On the other hand, in the embodiments of the present invention, multiple first electrode blocks belonging to the same first touch electrode are electrically connected to the same touch signal line, and multiple second electrode blocks belonging to the same second touch electrode are also electrically connected to the same touch electrode line. When the number of electrode blocks is fixed, the number of touch signal lines connected to them is reduced, that is, the number of touch channels is reduced. Therefore, the number of analog front-end devices (AFE) and touch driver chips used to process touch signals in the touch display device can be reduced accordingly.

[0011] Moreover, by reducing the number of touch signal lines and touch driver chips, the space required for touch signal lines and touch driver chips within the bezel of the touch display panel is further reduced, which is more conducive to realizing the narrow bezel design of the touch display device.

[0012] On the other hand, based on the above structure, the touch driver chip only needs to receive the touch detection signal fed back from the touch signal line connected to it at the same time to detect the touch status in the touch area. There is no need to perform time-division detection, the detection time is shorter, and compared with the structure with touch switches in the prior art, it can also avoid the time loss caused by switching touch switches during time-division detection. When the touch electrode and the common electrode are reused, the refresh rate of touch and display is effectively improved, and the touch and display effects are better.

[0013] In one embodiment, the touch display panel includes a plurality of touch areas arranged along the second direction. In this case, the touch display panel is divided into a plurality of touch areas arranged along the second direction. Based on this area division method, the touch signal line connected to the touch structure in each touch area only needs to extend further along the first direction to the lower step area to connect with the touch driver chip. The extension length of the touch signal line is shorter and the wiring is simpler, which reduces the attenuation of the touch detection signal and the common voltage signal when they are transmitted on the touch signal line, and further improves the touch detection accuracy and display effect.

[0014] Furthermore, the orthographic projection of the touch signal line on the plane of the touch display panel passes through the orthographic projection of the plurality of first touch electrodes arranged along the first direction on the plane of the touch display panel.

[0015] In the above configuration, regardless of whether the touch signal line is connected to the first or second touch electrode on the side away from the touch driver chip or to the side closer to the touch driver chip, the touch signal line extends from the top of the touch area away from the touch driver chip to the location of the touch driver chip. At this time, the extension length of the multiple touch signal lines tends to be consistent, which effectively improves the load uniformity of the touch signal lines, and thus improves the voltage drop consistency of the touch detection signal or common voltage signal transmitted on different touch signal lines.

[0016] In one embodiment, the first touch electrode and the second touch electrode are reused as a common electrode;

[0017] The touch display panel further includes sub-pixels, each sub-pixel including a pixel electrode, and the orthographic projection of each pixel electrode on the plane of the touch display panel is located within the orthographic projection of the first touch electrode or the second touch electrode on the plane of the touch display panel.

[0018] By ensuring that the orthographic projection of the pixel electrode of each sub-pixel is located within the orthographic projection of the first or second touch electrode, situations where some pixel electrodes do not overlap with the touch electrode, or where a portion of a touch electrode overlaps with the touch electrode while the rest does not, can be avoided. This ensures that the pixel electrode of each sub-pixel and its corresponding common electrode completely overlap, thereby ensuring that a uniform electric field can be formed between the pixel electrode of each sub-pixel and the common electrode, improving the accuracy of the rotation angle of the liquid crystal molecules, and thus improving the display effect.

[0019] Furthermore, there is a gap between the orthographic projections of any two adjacent pixel electrodes on the plane of the touch display panel. The edges of the orthographic projections of the first touch electrode and the second touch electrode on the plane of the touch display panel are located within the gap. This ensures that the orthographic projection of the touch electrode can completely cover the orthographic projection of each pixel electrode, while also leaving a gap between the edge of the orthographic projection of the touch electrode and the edge of the orthographic projection of the pixel electrode. Even if the setting position of the touch electrode or pixel electrode is slightly deviated due to factors such as process errors, the orthographic projection of the touch electrode can still cover the orthographic projection of the pixel electrode, thus improving the reliability of the relative positional relationship between the pixel electrode and the touch electrode.

[0020] In one embodiment, the patterns of multiple first electrode blocks after translation overlap, and the patterns of multiple second electrode blocks after translation overlap. With this arrangement, the touch electrodes are arranged more regularly throughout the panel. When performing touch detection, it is easier to convert the positions of the first and second touch electrodes in the panel into touch point coordinates, resulting in lower computational complexity and more accurate calculation results for the touch point coordinates.

[0021] Secondly, embodiments of this application also provide another touch display device, including:

[0022] A touch display panel, the touch display panel including multiple touch areas, the touch areas including a first touch area and a second touch area, the first touch area and the second touch area respectively including multiple touch structures;

[0023] Multiple touch driver chips, including a first touch chip and a second touch chip, wherein the first touch chip is electrically connected to a touch signal line connected to the touch structure in the first touch area, and the second touch chip is electrically connected to a touch signal line connected to the touch structure in the second touch area.

[0024] In this embodiment, by dividing the touch display panel into regions and setting multiple independent touch structures in each divided touch region, the touch detection accuracy of the touch display device can be improved, especially the touch detection accuracy of large-size touch display devices under multi-finger touch. Specifically, each touch region includes multiple independent touch structures. The touch driver chip can detect the touch situation in the detection area where each touch structure is located individually. When performing multi-finger touch, since the area of ​​the detection area corresponding to each touch structure is small, multiple fingers are more likely to be placed in the detection areas where different touch structures are located. Therefore, when the touch driver chip judges each detection area individually, it is easier to accurately determine the touch point coordinates of different finger touch positions, reducing the risk of misjudgment.

[0025] Furthermore, based on the above structure, a single touch driver chip only needs to simultaneously receive the touch detection signals fed back from the touch signal lines connected to it to detect the touch status in the touch area. Multiple touch driver chips can also perform touch detection simultaneously. Therefore, the embodiments of this application do not require time-division detection, resulting in a shorter detection time. Moreover, it avoids the time loss caused by switching touch switches and the problem of low circuit reliability caused by on-resistance.

[0026] In one embodiment, multiple touch areas are arranged in the same direction, and the arrangement direction of the touch areas intersects with the extension direction of the touch signal lines. Based on this area division method, the touch signal lines connected to the touch structure in each touch area only need to extend further along the first direction to the lower step area to connect with the touch driver chip. The extension length of the touch signal lines is shorter and the wiring is simpler, reducing the attenuation of the touch detection signal and the common voltage signal during transmission on the touch signal lines, and further improving the touch detection accuracy and display effect.

[0027] In one embodiment, the touch structure includes a plurality of first touch electrodes and a plurality of second touch electrodes, the plurality of first touch electrodes being arranged along a first direction and the plurality of second touch electrodes being arranged along a second direction, the first touch electrodes and the second touch electrodes being in the same layer and insulated from each other, and the first direction intersecting the second direction;

[0028] The first touch electrode includes a plurality of first electrode blocks arranged along the second direction, and two adjacent first electrode blocks are connected by a connecting portion. One first touch electrode is electrically connected to a touch signal line. The second touch electrode includes a plurality of second electrode blocks arranged along the first direction, and a plurality of second electrode blocks in one second touch electrode are electrically connected to a touch signal line.

[0029] In the above structure, multiple first electrode blocks belonging to the same first touch electrode are electrically connected to the same touch signal line, and multiple second electrode blocks belonging to the same second touch electrode are also electrically connected to the same touch electrode line. When the number of electrode blocks is fixed, the number of touch signal lines connected to them is reduced, which means the number of touch channels is reduced. Therefore, the number of analog front-end devices (AFE) and touch driver chips used to process touch signals in the touch display device can be reduced accordingly.

[0030] Furthermore, by reducing the number of touch signal lines and touch driver chips, the space required for touch signal lines and touch driver chips within the bezel of the touch display panel is further reduced, which is more conducive to realizing the narrow bezel design of the touch display device.

[0031] Furthermore, in the above structure, the electrode blocks in the first touch electrode and the second touch electrode do not need to be electrically connected by a bridge. Therefore, the embodiments of this application only need to adjust the patterned design of the common electrode so that it is cut into multiple independent first touch electrodes and second touch electrodes. There is no need to add a process to form a bridge and a corresponding mask. Therefore, it will not increase the design cost of the panel or the design complexity of the panel, and effectively improves the application range.

[0032] Furthermore, in the direction of the plane where the touch display panel is located, the orthographic projection of the touch signal line passes through the orthographic projection of the plurality of first touch electrodes arranged along the first direction in the touch display panel.

[0033] In the above configuration, regardless of whether the touch signal line is connected to the first or second touch electrode on the side away from the touch driver chip or to the side closer to the touch driver chip, the touch signal line extends from the top of the touch area away from the touch driver chip to the location of the touch driver chip. At this time, the extension length of the multiple touch signal lines tends to be consistent, which effectively improves the load uniformity of the touch signal lines, and thus improves the voltage drop consistency of the touch detection signal or common voltage signal transmitted on different touch signal lines.

[0034] In one embodiment, the touch structure includes a plurality of first touch electrodes and a plurality of second touch electrodes, wherein the first touch electrodes and the second touch electrodes are alternately arranged in a second direction;

[0035] The first touch electrode includes a first electrode block arranged along a first direction, and one first electrode block is electrically connected to a touch signal line. The second touch electrode includes a second electrode block arranged along the first direction, and one second electrode block is electrically connected to a touch signal line. The first direction and the second direction intersect.

[0036] The first electrode block includes a first electrode portion and a second electrode portion arranged along the first direction, wherein the width of the first electrode portion in the second direction is smaller than the width of the second electrode portion in the second direction. The second electrode block includes a third electrode portion and a fourth electrode portion arranged along the first direction, wherein the width of the third electrode portion in the second direction is greater than the width of the fourth electrode portion in the second direction.

[0037] In the above structure, since the widths of the first electrode block and the second electrode block vary at different positions, the capacitance changes of the first or second electrode block differ depending on the position of the finger touching it in the first direction. Especially in self-capacitive touch, the coordinate position of the finger in the first direction can be accurately determined based on the capacitance change of the first or second electrode block. Therefore, even if the lengths of the first and second electrode blocks in the first direction are increased, accurate identification of the finger's coordinate position in the first direction can still be guaranteed. Therefore, while achieving high touch accuracy, the embodiments of this application can increase the size of the first and second electrode blocks in the first direction, thereby reducing the number of electrode blocks required in the touch display device and correspondingly reducing the number of touch signal lines connected to them.

[0038] As can be seen, the above structure can effectively reduce the number of touch channels, and the number of analog front-end devices (AFEs) and touch driver chips used to process touch signals in touch display devices can be reduced accordingly. Especially for large-size touch display devices, the number of touch signal channels and touch driver chips can be reduced to a greater extent, effectively simplifying the cost requirements and architecture of the touch display device.

[0039] Furthermore, by reducing the number of touch signal lines and touch driver chips, the space required for touch signal lines and touch driver chips within the bezel of the touch display panel is further reduced, which is more conducive to realizing the narrow bezel design of the touch display device.

[0040] Furthermore, to further improve the detection accuracy of the finger's coordinate position in the first direction, the width of the first electrode block increases in the second direction, and the width of the second electrode block decreases in the second direction.

[0041] Furthermore, the touch signal line includes a first end and a second end, the first end being electrically connected to the touch driver chip, and the second ends of the plurality of touch signal lines being aligned.

[0042] At this point, regardless of whether the touch signal line is connected to the first or second electrode block on the side away from the touch driver chip, or to the first or second electrode block on the side closer to the touch driver chip, the touch signal line extends from the top of the touch area away from the touch driver chip to the location of the touch driver chip. At this point, the extension length of the multiple touch signal lines tends to be consistent, which effectively improves the load uniformity of the touch signal lines, and thus improves the voltage drop consistency of the touch detection signal or common voltage signal transmitted on different touch signal lines.

[0043] In one embodiment, the first touch electrode and the second touch electrode are reused as a common electrode;

[0044] The touch display panel further includes sub-pixels, each sub-pixel including a pixel electrode, and the orthographic projection of each pixel electrode on the plane of the touch display panel is located within the orthographic projection of the first touch electrode or the second touch electrode on the plane of the touch display panel.

[0045] By ensuring that the orthographic projection of the pixel electrode of each sub-pixel is located within the orthographic projection of the first or second touch electrode, situations where some pixel electrodes do not overlap with the touch electrode, or where a portion of a touch electrode overlaps with the touch electrode while the rest does not, can be avoided. This ensures that the pixel electrode of each sub-pixel and its corresponding common electrode completely overlap, thereby ensuring that a uniform electric field can be formed between the pixel electrode of each sub-pixel and the common electrode, improving the accuracy of the rotation angle of the liquid crystal molecules, and thus improving the display effect.

[0046] Furthermore, there is a gap between the orthographic projections of any two adjacent pixel electrodes on the plane of the touch display panel. In the direction of the plane of the touch display panel, the edges of the orthographic projections of the first touch electrode and the second touch electrode are located within the gap. This ensures that the orthographic projections of the touch electrodes can completely cover the orthographic projections of each pixel electrode, while also leaving a gap between the edges of the orthographic projections of the touch electrodes and the edges of the orthographic projections of the pixel electrodes. Even if the placement of the touch electrodes or pixel electrodes deviates slightly due to factors such as process errors, the orthographic projections of the touch electrodes can still cover the orthographic projections of the pixel electrodes, thus improving the reliability of the relative positional relationship between the pixel electrodes and the touch electrodes.

[0047] In one embodiment, the patterns of the multiple first electrode blocks after translation overlap, and the patterns of the multiple second electrode blocks after translation overlap. This arrangement results in a more regular arrangement of the touch electrodes throughout the panel. During touch detection, it is easier to convert the positions of the first and second touch electrodes within the panel into touch point coordinates, reducing computational complexity and providing more accurate results.

[0048] Thirdly, the present invention also provides a touch detection method, which is applied to the above-mentioned touch display device, comprising: a touch driver chip acquiring touch detection signals transmitted by touch signal lines, detecting the touch status at the location of each touch structure in the touch area, and calculating the coordinates of touch points based on the acquired touch detection signals.

[0049] By dividing the touch display panel into regions and setting multiple independent touch structures within each region, each independent touch structure corresponds to a smaller detection area. The touch driver chip can individually detect the touch situation within the detection area of ​​each touch structure. When judging each detection area individually, the touch driver chip can more accurately obtain the point coordinates of different finger touch positions, reducing the risk of misjudgment and improving the accuracy of touch detection. Moreover, in this embodiment of the invention, the touch driver chip only needs to simultaneously receive the touch detection signal fed back from the touch signal line connected to it to detect the touch situation in the touch area, without the need for time-division detection. The detection time is shorter, effectively improving the refresh rate of touch and display, resulting in better touch and display effects.

[0050] In one embodiment, the process of the touch driver chip acquiring touch detection signals transmitted by the touch signal line, detecting the touch status at the locations of each touch structure in the touch area, and calculating the coordinates of the touch point based on the acquired touch detection signals includes:

[0051] Step S1: Based on the current application status of the touch display panel, determine whether multi-finger touch is required. If yes, proceed to step S2; otherwise, proceed to step S3.

[0052] Step S2: Based on the interface currently displayed on the touch display panel, determine the touch area that the finger needs to touch. The touch driver chip corresponding to this touch area collects the touch detection signal and calculates the coordinates of the touch point based on the collected touch detection signal.

[0053] Step S3: Each of the touch driver chips collects touch detection signals and determines whether the touch occurs in the corresponding touch area. If so, the touch driver chip corresponding to the touch area where the touch occurred calculates the coordinates of the touch point based on the collected touch detection signals.

[0054] In one implementation, step S2 includes:

[0055] Step S21: Based on the interface displayed on the touch display panel, determine whether the positions that multiple fingers need to touch belong to the same touch area. If yes, proceed to step S22; otherwise, proceed to step S23.

[0056] Step S22: The touch driver chip corresponding to the touch area collects the touch detection signal and calculates the coordinates of the touch point based on the collected touch detection signal.

[0057] Based on the one-to-one correspondence between touch areas and touch driver chips, when performing multi-finger touch, if the position to be touched by multiple fingers is only located in one or a few touch areas, touch detection can be performed using only the touch driver chip corresponding to the touch area where the touch position is located, without all touch driver chips needing to work, thus saving the power consumption required for touch detection.

[0058] Step S23: In multiple corresponding touch areas, the touch driver chip corresponding to each touch area collects touch detection signals. When at least two touch driver chips collect edge touch detection signals containing touch information, the touch detection signals collected by the at least two touch driver chips are combined to calculate the touch point coordinates. When none of the touch driver chips collect edge touch detection signals containing touch information, each touch driver chip calculates the touch point coordinates based on the collected touch detection signals.

[0059] Furthermore, within each frame, the touch driver chip records the calculated coordinates of the touch point and the regional position data of the touch area where the touch occurred;

[0060] When at least two of the touch driver chips acquire edge touch detection signals containing touch information, the touch detection method further includes: correcting the touch point coordinates calculated in the current frame based on the touch point coordinates and area position data recorded in the previous frame, so as to obtain the actual touch point coordinates in the current frame.

[0061] Considering the possibility of misjudgment, when at least two touch driver chips collect edge touch detection signals containing touch information, the coordinates of multiple touch points calculated in the current frame may contain misjudged coordinates. In this case, the touch point coordinates calculated in the current frame can be corrected by combining the touch situation of the previous frame to obtain more accurate coordinate values ​​and avoid triggering positions that have not been touched. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of a structure of a touch display device in the prior art;

[0063] Figure 2 for Figure 1 The corresponding timing diagram;

[0064] Figure 3 This is a schematic diagram of another structure of a touch display device in the prior art;

[0065] Figure 4 This is a schematic diagram of a touch display device provided in an embodiment of the present invention;

[0066] Figure 5This is a schematic diagram illustrating the connection between the touch structure and the touch driver chip in a single touch area provided in an embodiment of the present invention.

[0067] Figure 6 This is a schematic diagram of a single touch structure provided in an embodiment of the present invention;

[0068] Figure 7 This is a schematic diagram of another structure of the touch signal line provided in an embodiment of the present invention;

[0069] Figure 8 This is another schematic diagram of the touch structure provided in an embodiment of the present invention;

[0070] Figure 9 for Figure 8 A sectional view along the A1-A2 direction;

[0071] Figure 10 This is another structural schematic diagram of the touch display device provided in the embodiments of this application;

[0072] Figure 11 This is a schematic diagram illustrating another connection between the touch structure in a single touch area and the touch driver chip provided in an embodiment of this application.

[0073] Figure 12 for Figure 11 A schematic diagram of a corresponding touch control structure;

[0074] Figure 13 This is a schematic diagram illustrating another connection between the touch structure and the touch driver chip in a single touch area provided in an embodiment of this application.

[0075] Figure 14 for Figure 13 A schematic diagram of a corresponding touch control structure;

[0076] Figure 15 for Figure 11 Another structural diagram of the corresponding touch structure;

[0077] Figure 16 This is a flowchart illustrating the design concept of the touch display device provided in an embodiment of the present invention.

[0078] Figure 17 This is a flowchart of the touch detection method provided in an embodiment of the present invention;

[0079] Figure 18 This is another flowchart of the touch detection method provided in an embodiment of the present invention. Detailed Implementation

[0080] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0081] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0082] Before describing the technical solution of this invention, this invention first specifically explains the problems existing in the prior art of touch display devices:

[0083] In existing embedded touch display devices, touch electrodes are usually reused with common electrodes. In the manufacturing process, the common electrode covering the entire surface is cut into multiple independent electrode blocks arranged in a dot matrix. These electrode blocks transmit a common voltage signal during the display period to form an electric field with the pixel electrodes to drive the rotation of the liquid crystal. During the touch period, they transmit touch signals. The finger touch position is determined by detecting the capacitance change of each electrode block.

[0084] As the size of touch display devices continues to increase, the number of touch electrodes has increased exponentially to achieve a certain level of touch detection accuracy. Correspondingly, the number of touch channels has also increased significantly, necessitating the use of a larger number of touch driver chips connected to these channels. For example, in a 65-inch touch display device, with a 4.5mm pitch between the center points of the touch electrodes, a total of 57,600 touch channels are required. Even with time-division driving using 960 source signals, 60 touch driver chips are still needed. This excessive number of touch driver chips limits the application of embedded touch technology in large-screen displays. Furthermore, the significant increase in the number of touch signal lines and touch driver chips also increases the bezel width of the touch display device, posing a considerable challenge to its architecture.

[0085] Furthermore, from the perspective of the touch driver chip itself, it needs to adopt a time-division touch detection method, requiring 8 to 12 operations for full-screen touch, thus increasing the overall touch detection time. Since the touch electrodes also need to be reused as common electrodes, the touch period and display period need to be performed in a time-division manner within one frame. Therefore, the increase in touch detection time has an adverse effect on the refresh rate of both touch and display.

[0086] However, even the improved embedded touch display devices in the existing technology still have some drawbacks. The following explanation uses two different structures as examples.

[0087] The first existing structure:

[0088] Figure 1 This is a schematic diagram of a structure of a touch display device in the prior art, such as... Figure 1 As shown, the touch display device includes a plurality of touch electrodes 101 arranged in a matrix, each touch electrode being electrically connected to a first touch signal line 102. The touch display device also includes: a plurality of touch switches 103 electrically connected to the plurality of first touch signal lines 102 in a one-to-one correspondence; at least two selection lines TPH (TPH1 and TPH2), the at least two selection lines TPH being electrically connected to the enable terminals of the touch switches 103; and a plurality of second touch signal lines RX (RX1 to RX8), one of the second touch signal lines RX being electrically connected to at least two touch switches 103 simultaneously.

[0089] Combination Figure 2 The timing diagram of the signal shown includes a display phase D and a touch phase T in one frame. The touch phase T includes a first touch sub-phase T1 and a second touch sub-phase T2. In the first touch sub-phase T1, the selector line TPH1 outputs a high level to control the touch switch 103 connected to it to be turned on. The second touch signal lines RX1 to RX8 transmit touch signals to the touch electrodes 101 in the odd-numbered column through the turned-on touch switch 103. In the second touch sub-phase T2, the selector line TPH2 outputs a high level to control the touch switch 103 connected to it to be turned on. The second touch signal lines RX1 to RX8 transmit touch signals to the touch electrodes 101 in the even-numbered column through the turned-on touch switch 103.

[0090] In the above structure, although the number of touch signal lines connected to the touch driver chip can be reduced by using touch switches 103, a large number of touch switches 103 need to be added to the touch display panel, and the touch display device still suffers from problems such as large bezel width and high cost. Moreover, the touch switches 103 have a large on-resistance, resulting in poor resistance balance in the circuit. In addition, this structure still requires time-division touch detection, and the touch switches 103 need to be switched during time-division detection, which incurs additional time loss, resulting in a longer touch detection time. Furthermore, due to the time difference in time-division sampling between adjacent channels, it can also cause line breakage in scenarios such as fast swipes and row and column noise differences in row and column single-stroke scanning scenarios.

[0091] The second existing structure:

[0092] Figure 3 This is a schematic diagram of another structure of a touch display device in the prior art, such as... Figure 3 As shown, the touch display device includes multiple self-capacitance electrodes 201, each with a cutout area 202. The touch display device also includes a common electrode 203, which is insulated from the self-capacitance electrodes 201 and located within the cutout area 202. Each self-capacitance electrode 201 is electrically connected to a wire 204. The touch display panel has four sides, and each self-capacitance electrode 201 is connected to the nearest side via a corresponding wire 204, provided the wires 204 do not cross, and is electrically connected to the terminal block 205 of the touch driver chip.

[0093] In this structure, the area of ​​the self-capacitance electrode 201 can be reduced by utilizing the hollow area 202, thereby increasing the capacitance change during touch and improving touch sensitivity. Therefore, the overall area occupied by the self-capacitance electrode 201 can be set larger, thus reducing the number of self-capacitance electrodes 201 in the touch display device and correspondingly reducing the number of wires 204 electrically connected to the self-capacitance electrode 201, i.e., reducing the number of touch channels. However, setting the hollow area 202 will reduce the touch spacing, causing a decrease in touch accuracy and linearity. Especially during active stylus touch, the hollow area 202 will reduce the coupling signal between the active stylus and the self-capacitance electrode 201, leading to abnormal situations where the active stylus cannot be used. Furthermore, this structure will also affect the retention capacitance between the common electrode 203 and the pixel electrode, thus affecting the display.

[0094] Therefore, embodiments of the present invention provide a touch display device, which may specifically be an organic light-emitting diode (OLED) display device, a liquid crystal display (LCD) display device, or a micro light-emitting diode (micro LED) display device, etc. Moreover, the touch display device may be a rigid, non-foldable display device or a flexible, foldable display device. Embodiments of the present invention will be described using an LCD display device as an example.

[0095] Figure 4 This is a schematic diagram of a touch display device provided in an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the connection between the touch structure and the touch driver chip in a single touch area provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of a single touch structure provided in an embodiment of the present invention, as shown below. Figures 4-6 As shown, the touch display device includes a touch display panel 1, which includes at least one touch area 2. The touch area 2 includes multiple touch structures 3, which can be arranged in a matrix. Each touch structure 3 includes multiple first touch electrodes 4 arranged along a first direction X and multiple second touch electrodes 5 arranged along a second direction Y. The first touch electrodes 4 and second touch electrodes 5 are on the same layer and insulated from each other. The first direction X intersects the second direction Y. For example, the first direction X is a row direction and the second direction Y is a column direction, or vice versa. Figure 4 and Figure 5 This illustration is based on the example of the first direction X being the column direction and the second direction Y being the row direction. In this embodiment of the invention, the row direction refers to the direction of the horizontal array substrate row driver (Gate Driver On Array, GOA) circuit.

[0096] Combination Figure 5 and Figure 6 The first touch electrode 4 includes a plurality of first electrode blocks 6 arranged along the second direction Y, with adjacent first electrode blocks 6 connected by a connecting part 7. Each first touch electrode 4 is electrically connected to a touch signal line 8. The second touch electrode 5 includes a plurality of second electrode blocks 9 arranged along the first direction X, with each second touch electrode 5 having multiple second electrode blocks 9 electrically connected to a touch signal line 8. The first touch electrode 4 and the second touch electrode 5 are electrically connected to different touch signal lines 8. In other words, the first electrode blocks 6 and the connecting part 7 in the first touch electrode 4 are interconnected, and the first touch electrode 4 is an electrode strip structure, while the second touch electrode 5 includes multiple separate second electrode blocks 9.

[0097] It should be noted that, taking the first direction X as the column direction and the second direction Y as the row direction as an example, in the same touch structure 3, the first touch electrode 4 is arranged in odd-numbered rows, and the i-th second electrode block 9 of the multiple second touch electrodes 5 is located in the same row and arranged in even-numbered rows, and the first electrode block 6 and the second electrode block 9 are staggered in the column direction; or, the first touch electrode 4 is arranged in even-numbered rows, and the i-th second electrode block 9 of the multiple second touch electrodes 5 is located in the same row and arranged in odd-numbered rows, and the first electrode block 6 and the second electrode block 9 are staggered in the column direction, where i is a positive integer greater than or equal to 1.

[0098] The touch display panel 1 also includes at least one touch driver chip 10, and each touch driver chip 10 is electrically connected to a touch signal line 8 connected to a touch structure 3 in a touch area 2. That is, at least one touch driver chip 10 corresponds one-to-one with at least one touch area 2, and in a touch area 2, multiple touch signal lines 8 electrically connected to multiple touch structures 3 are all electrically connected to the same touch driver chip 10.

[0099] In this embodiment of the invention, the touch electrodes can be reused with a common electrode. The first touch electrode 4 and the second touch electrode 5 are formed by patterning a common electrode that covers the entire surface. At this time, one frame includes a display period and a touch period. During the display period, a common voltage signal is transmitted in the first touch electrode 4 and the second touch electrode 5. An electric field is formed between the first touch electrode 4 and the second touch electrode 5 and the pixel electrode of the sub-pixel to drive the liquid crystal molecules to rotate normally. During the touch period, a touch detection signal is transmitted in the first touch electrode 4 and the second touch electrode 5 to detect the touch position of the finger.

[0100] Furthermore, the aforementioned touch structure 3 can be either a self-capacitive touch structure 3 or a mutual-capacitive touch structure 3. When the touch structure 3 is a self-capacitive touch structure 3, when a finger touches it, the human body capacitance acts on the touch structure 3, and the capacitance of the self-capacitance of the first touch electrode 4 and the second touch electrode 5 at the touch position changes. Then, based on the touch detection signal fed back by the touch signal line 8 connected to the first touch electrode 4 and the second touch electrode 5, the coordinates of the touch point are determined. When the touch mode is a mutual-capacitive touch structure 3, adjacent first electrode blocks 6 and second electrode blocks 9 form mutual capacitance at the slit. When a finger touches it, the capacitance of the mutual capacitance at the touch position changes. Then, based on the touch detection signal fed back by the touch signal line 8 connected to the first touch electrode 4 and the second touch electrode 5, the coordinates of the touch point are determined.

[0101] In this embodiment of the invention, by dividing the touch display panel 1 into regions and setting multiple independent touch structures 3 within each divided touch region 2, the touch detection accuracy of the touch display device can be improved, especially the touch detection accuracy of large-size touch display devices under multi-finger touch. Specifically, if only a matrix touch structure is set in the entire touch display panel, it is easy to misjudge the touch point coordinates during multi-finger touch, causing untouched positions to be triggered, resulting in a "ghosting" phenomenon. Based on the above setting, each touch region 2 includes multiple independent touch structures 3, and the touch driver chip 10 can detect the touch situation in the detection area of ​​each touch structure 3 individually. During multi-finger touch, since the detection area corresponding to each touch structure 3 is small, multiple fingers are more likely to be placed in the detection areas of different touch structures 3. Therefore, when the touch driver chip 10 judges each detection area individually, it is easier to accurately determine the touch point coordinates of different finger touch positions, reducing the risk of misjudgment.

[0102] On the other hand, in this embodiment of the invention, multiple first electrode blocks 6 belonging to the same first touch electrode 4 are electrically connected to the same touch signal line 8, and multiple second electrode blocks 9 belonging to the same second touch electrode 5 are also electrically connected to the same touch electrode line. Compared with the prior art where each electrode block is connected to a touch signal line, when the number of electrode blocks is fixed, the number of touch signal lines 8 connected to them is reduced, which means the number of touch channels is reduced. Therefore, the number of analog front-end devices (AFE) and touch driver chips 10 used to process touch signals in the touch display device can be reduced accordingly. Especially for large-size touch display devices, the number of touch signal channels and touch driver chips 10 can be reduced to a greater extent, and the cost requirements and architecture of the touch display device are effectively simplified. In other words, when the number of touch channels is fixed, this embodiment of the invention can further reduce the area of ​​the electrode blocks to set more touch structures 3, thereby further improving the touch detection accuracy.

[0103] Furthermore, by reducing the number of touch signal lines 8 and touch driver chips 10, the space occupied by touch signal lines 8 and touch driver chips 10 within the bezel of the touch display panel 1 is further reduced, which is more conducive to realizing the narrow bezel design of the touch display device. For example, in existing large-size touch display devices, there are many touch driver chips, so the touch driver chips need to be bonded to the four sides of the bezel of the touch display panel, resulting in wide bezels on all four sides. However, in the embodiment of the present invention, the number of touch driver chips 10 is greatly reduced, so the touch driver chips 10 only need to be bonded to the lower step of the touch display panel 1, enabling the touch display device to achieve a design with ultra-narrow bezels on three sides and a relatively narrow bottom bezel.

[0104] On the other hand, based on the above structure, the touch driver chip 10 only needs to receive the touch detection signal fed back from the touch signal line 8 connected to it to detect the touch situation in the touch area 2. There is no need to perform time-division detection, the detection time is shorter, and compared with the structure of setting touch switches in the prior art, it can also avoid the time loss caused by switching touch switches during time-division detection. When the touch electrode and the common electrode are reused, the refresh rate of touch and display is effectively improved, and the touch and display effects are better.

[0105] Furthermore, it should be noted that in the embodiments of the present invention, the electrode blocks in the first touch electrode 4 and the second touch electrode 5 do not need to be electrically connected by a bridge. Therefore, the embodiments of the present invention only need to adjust the patterned design of the common electrode so that it is cut into multiple independent first touch electrodes 4 and second touch electrodes 5. There is no need to add a process flow for forming a bridge and a corresponding mask plate. Therefore, it will not increase the design cost of the panel or the design complexity of the panel, and effectively improves the application range.

[0106] In one implementation, please refer again. Figure 4 The touch display panel includes multiple touch areas 2, which are arranged along the second direction Y. In this case, the touch display panel 1 is divided into multiple touch areas 2 arranged along the second direction Y. Based on this area division method, the touch signal line 8 connected to the touch structure 3 in each touch area 2 only needs to extend further along the first direction X to the lower step area to connect with the touch driver chip 10. The extension length of the touch signal line 8 is shorter and the wiring is simpler, which reduces the attenuation of the touch detection signal and the common voltage signal when they are transmitted on the touch signal line 8, and further improves the touch detection accuracy and display effect.

[0107] Furthermore, Figure 7 This is another schematic diagram of the structure of the touch signal line provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the orthographic projection of the touch signal line 8 on the plane of the touch display panel 1 passes through the orthographic projection of the plurality of first touch electrodes 4 arranged along the first direction X in the touch display panel 1 on the plane of the touch display panel 1.

[0108] In the above configuration, regardless of whether the touch signal line 8 is connected to the first touch electrode 4 or the second touch electrode 5 on the side away from the touch driver chip 10, or to the side close to the touch driver chip 10, the touch signal line 8 extends from the top of the touch area 2 away from the touch driver chip 10 to the location of the touch driver chip 10. At this time, the extension length of the multiple touch signal lines 8 tends to be consistent, which effectively improves the load uniformity of the touch signal lines 8, and thus improves the voltage drop consistency of the touch detection signal or common voltage signal transmitted on different touch signal lines 8.

[0109] In one implementation, Figure 8 This is another schematic diagram of the touch structure provided in an embodiment of the present invention. Figure 9 for Figure 8 A sectional view along the A1-A2 direction, as shown below. Figure 8 and Figure 9 As shown, the first touch electrode 4 and the second touch electrode 5 are reused as a common electrode. The touch display panel 1 also includes sub-pixels 11, such as red sub-pixels for emitting red light, green sub-pixels for emitting green light, and blue sub-pixels for emitting blue light. Each sub-pixel 11 includes a pixel electrode 12, and the orthographic projection of each pixel electrode 12 on the plane of the touch display panel 1 lies within the orthographic projection of the first touch electrode 4 or the second touch electrode 5 on the plane of the touch display panel 1. It should be noted that... Figure 8 The rectangular shape of the pixel electrode 12 shown is for illustrative purposes only. In other optional embodiments of the present invention, the pixel electrode 12 may also be a comb-shaped structure.

[0110] When the first touch electrode 4 and the second touch electrode 5 are reused as a common electrode, a frame time includes a touch period and a display period. During the touch period, touch detection signals are transmitted on the first touch electrode 4 and the second touch electrode 5, and the first touch electrode 4 and the second touch electrode 5 are used for touch detection. During the display period, the first touch electrode 4 and the second touch electrode 5 are used as a common electrode, and a common voltage signal is transmitted on the first touch electrode 4 and the second touch electrode 5. An electric field is formed between the pixel electrode 12 of each sub-pixel 11 and the first touch electrode 4 or the second touch electrode 5 that overlaps with it. The liquid crystal molecules rotate under the action of the electric field, thereby realizing the display of the image.

[0111] By ensuring that the orthographic projection of the pixel electrode 12 of each sub-pixel 11 is located within the orthographic projection of the first touch electrode 4 or the second touch electrode 5, it is possible to avoid situations where some pixel electrodes 12 do not overlap with the touch electrode, or where a portion of a touch electrode overlaps with the touch electrode while the rest does not. This ensures that the pixel electrode 12 of each sub-pixel 11 and its corresponding common electrode completely overlap, thereby ensuring that a uniform electric field can be formed between the pixel electrode 12 of each sub-pixel 11 and the common electrode, improving the accuracy of the rotation angle of the liquid crystal molecules, and thus improving the display effect.

[0112] Furthermore, please see again Figure 8 and Figure 9 There is a gap 13 between the orthographic projections of any two adjacent pixel electrodes 12 on the plane of the touch display panel 1. The edges of the orthographic projections of the first touch electrode 4 and the second touch electrode 5 on the plane of the touch display panel 1 are located within the gap 13. This ensures that the orthographic projection of the touch electrode can completely cover the orthographic projection of each pixel electrode 12, while also leaving a gap between the edge of the orthographic projection of the touch electrode and the edge of the orthographic projection of the pixel electrode 12. Even if the setting position of the touch electrode or the pixel electrode 12 is slightly deviated due to factors such as process errors, the orthographic projection of the touch electrode can still cover the orthographic projection of the pixel electrode 12, thus improving the reliability of the relative positional relationship between the pixel electrode 12 and the touch electrode.

[0113] It should be noted that when the orthographic projection of each pixel electrode 12 on the plane of the touch display panel 1 is located within the orthographic projection of the first touch electrode 4 or the second touch electrode 5 on the plane of the touch display panel 1, the patterning design of the first touch electrode 4 and the second touch electrode 5 can be adaptively adjusted according to the arrangement of the sub-pixels 11. For example, when the pixel electrodes 12 in the sub-pixels 11 are arranged in a matrix, the first electrode block 6 in the first touch electrode 4 and the second electrode block 9 in the second touch electrode 5 can be approximately rhomboid in shape, and the edges of the first electrode block 6 and the second electrode block 9 are serrated to ensure that the orthographic projection of the first electrode block 6 and the second electrode block 9 completely covers the orthographic projection of the pixel electrode 12. Alternatively, in other optional embodiments of the present invention, the shape of the first electrode block 6 and the second electrode block 9 can also be square, triangular, etc.

[0114] In one embodiment, the patterns of multiple first electrode blocks 6 after translation overlap, and the patterns of multiple second electrode blocks 9 after translation overlap. That is, the first electrode blocks 6 included in the first touch electrode 4 have the same shape and area, and the second electrode blocks 9 included in the second touch electrode 5 also have the same shape and area. This arrangement makes the arrangement of the touch electrodes within the entire panel more regular. During touch detection, it is easier to convert the positions of the first touch electrodes 4 and second touch electrodes 5 within the panel into touch point coordinates, resulting in lower computational complexity and more accurate touch point coordinate calculations.

[0115] This application also provides another touch display device. Figure 10 This is another structural schematic diagram of the touch display device provided in the embodiments of this application. Figure 11 This is a schematic diagram illustrating another connection between the touch structure and the touch driver chip in a single touch area provided in an embodiment of this application, as shown below. Figure 10 and Figure 11 As shown, the touch display device includes a touch display panel 1, which includes multiple touch areas 2. Each touch area 2 includes a first touch area 31 and a second touch area 32. The first touch area 31 and the second touch area 32 each include multiple touch structures 3. The multiple touch structures 3 in the first touch area 31 and the second touch area 32 can be arranged in a matrix.

[0116] The touch display panel 1 also includes multiple touch driver chips 10. Each touch driver chip 10 includes a first touch chip 33 and a second touch chip 34. The first touch chip 33 is electrically connected to a touch signal line 8 connected to a touch structure 3 in the first touch area 31, and the second touch chip 34 is electrically connected to a touch signal line 8 connected to a touch structure 3 in the second touch area 32.

[0117] In this embodiment, by dividing the touch display panel 1 into regions and setting multiple independent touch structures 3 within each divided touch region 2, the touch detection accuracy of the touch display device can be improved, especially the touch detection accuracy of large-size touch display devices under multi-finger touch. Specifically, if only one touch structure is set within the entire touch display panel, during multi-finger touch, such as 10-finger touch in two-person operation, it is easy to misjudge the touch point coordinates, causing untouched positions to be triggered, resulting in a "ghosting" phenomenon. Based on the above setting, each touch region 2 includes multiple independent touch structures 3, and the touch driver chip 10 can detect the touch situation in the detection area of ​​each touch structure 3 individually. During multi-finger touch, since the detection area corresponding to each touch structure 3 is small, multiple fingers are more likely to be placed in the detection areas of different touch structures 3. Therefore, when the touch driver chip 10 judges each detection area individually, it is easier to accurately determine the touch point coordinates of different finger touch positions, reducing the risk of misjudgment.

[0118] Furthermore, based on the above structure, a single touch driver chip 10 only needs to simultaneously receive the touch detection signal fed back from the touch signal line 8 connected to it to detect the touch status in the touch area 2. Multiple touch driver chips 10 can also perform touch detection simultaneously. Therefore, this embodiment does not require time-division detection, resulting in a shorter detection time. Moreover, compared to the existing structure with a touch switch, connecting the touch driver chip 10 to the touch signal line 8 avoids the time loss caused by switching the touch switch and the problem of low circuit reliability caused by on-resistance. Furthermore, when the touch electrodes and common electrodes in the touch structure 3 are reused, this embodiment can effectively improve the refresh rate of touch and display, resulting in superior touch and display effects.

[0119] In one implementation, please refer again. Figure 10 Multiple touch areas 2 are arranged in the same direction, and the arrangement direction of the touch areas 2 intersects with the extension direction of the touch signal line 8, so as to... Figure 10 Taking the example of the touch signal line 8 extending along the first direction X and multiple touch areas 2 extending along the second direction Y, based on this area division method, the touch signal line 8 connected to the touch structure 3 in each touch area 2 only needs to extend further along the first direction X to the lower step area to connect with the touch driver chip 10. The extension length of the touch signal line 8 is shorter and the wiring is simpler, which reduces the attenuation of the touch detection signal and the common voltage signal when they are transmitted on the touch signal line 8, and further improves the touch detection accuracy and display effect.

[0120] In one embodiment of this application, see Figure 6The touch structure 3 includes multiple first touch electrodes 4 and multiple second touch electrodes 5. The multiple first touch electrodes 4 are arranged along a first direction X, and the multiple second touch electrodes 5 are arranged along a second direction Y. The first touch electrodes 4 and the second touch electrodes 5 are in the same layer and insulated from each other. The first direction X and the second direction Y intersect. The first touch electrode 4 includes multiple first electrode blocks 6 arranged along the second direction Y. Adjacent first electrode blocks 6 are connected by a connecting part 7. One first touch electrode 4 is electrically connected to a touch signal line 8. The second touch electrode 5 includes multiple second electrode blocks 9 arranged along the first direction X. The multiple second electrode blocks 9 in one second touch electrode 5 are electrically connected to a touch signal line 8. That is, the first electrode blocks 6 in the first touch electrode 4 and the connecting part 7 are connected to each other. The first touch electrode 4 is an electrode strip structure, while the second touch electrode 5 includes multiple separate second electrode blocks 9. It can be understood that the first touch electrode 4 and the second touch electrode 5 are electrically connected to different touch signal lines 8.

[0121] In the above structure, multiple first electrode blocks 6 belonging to the same first touch electrode 4 are electrically connected to the same touch signal line 8, and multiple second electrode blocks 9 belonging to the same second touch electrode 5 are also electrically connected to the same touch electrode line. When the number of electrode blocks is fixed, the number of touch signal lines 8 connected to them is reduced, which means the number of touch channels is reduced. Therefore, the number of analog front-end devices (AFE) and touch driver chips 10 used to process touch signals in the touch display device can be reduced accordingly. Especially for large-size touch display devices, the number of touch signal channels and touch driver chips 10 can be reduced to a greater extent, and the cost requirements and architecture of the touch display device are effectively simplified. In other words, when the number of touch channels is fixed, the embodiments of this application can further reduce the area of ​​the electrode blocks to set more touch structures 3, thereby further improving the touch detection accuracy. Moreover, compared to Figure 3 The existing structure shown above does not require a hollow area in the electrode block, thus avoiding touch problems caused by the touch gap between the common electrode and the touch electrode in the hollow area.

[0122] Furthermore, by reducing the number of touch signal lines 8 and touch driver chips 10, the space required for touch signal lines 8 and touch driver chips 10 within the bezel of the touch display panel 1 is further reduced, which is more conducive to realizing the narrow bezel design of the touch display device.

[0123] Furthermore, in the above structure, the electrode blocks in the first touch electrode 4 and the second touch electrode 5 do not need to be electrically connected by a bridge. Therefore, in this embodiment, only the patterned design of the common electrode needs to be adjusted so that it is cut into multiple independent first touch electrodes 4 and second touch electrodes 5. There is no need to add a process to form a bridge and a corresponding mask. Therefore, it will not increase the design cost of the panel or the design complexity of the panel, and effectively improves the application range.

[0124] It should be noted that if the aforementioned single touch structure 3 is considered as an M*N matrix touch structure (the touch structure 3 includes M first touch electrodes 4 and N second touch electrodes 5), if only one large matrix touch structure is set in the entire panel, it is easy to misjudge the coordinates of the touch points during multi-finger touch, causing untouched positions to be triggered. In this embodiment, each touch area 2 includes multiple independent touch structures 3, and the detection area corresponding to each touch structure 3 is smaller. Therefore, during multi-finger touch, multiple fingers are more likely to be placed in the detection areas of different touch structures 3. When the touch driver chip 10 judges each detection area individually, it is easier to accurately determine the coordinates of the touch points of different finger touch positions, reducing the risk of misjudgment.

[0125] Further, see Figure 7 In the direction of the plane where the touch display panel 1 is located, the orthographic projection of the touch signal line 8 passes through the orthographic projection of the plurality of first touch electrodes 4 arranged along the first direction X in the touch display panel 1.

[0126] In the above configuration, regardless of whether the touch signal line 8 is connected to the first touch electrode 4 or the second touch electrode 5 on the side away from the touch driver chip 10, or to the side close to the touch driver chip 10, the touch signal line 8 extends from the top of the touch area 2 away from the touch driver chip 10 to the location of the touch driver chip 10. At this time, the extension length of the multiple touch signal lines 8 tends to be consistent, which effectively improves the load uniformity of the touch signal lines 8, and thus improves the voltage drop consistency of the touch detection signal or common voltage signal transmitted on different touch signal lines 8.

[0127] Alternatively, in another implementation, combined with Figure 11 and Figure 12 , Figure 12 for Figure 11 A schematic diagram of the corresponding touch structure, and a combination of Figure 13 and Figure 14 , Figure 13 This is a schematic diagram illustrating another connection between the touch structure and the touch driver chip in a single touch area provided in an embodiment of this application. Figure 14 for Figure 13 A schematic diagram of a corresponding touch structure is shown. The touch structure 3 includes multiple first touch electrodes 4 and multiple second touch electrodes 5. The first touch electrodes 4 and second touch electrodes 5 are arranged alternately in the second direction Y. The first touch electrodes 4 include first electrode blocks 6 arranged along the first direction X, and each first electrode block 6 is electrically connected to a touch signal line 8. The second touch electrodes 5 include second electrode blocks 9 arranged along the first direction X, and each second electrode block 9 is electrically connected to a touch signal line 8. The first direction X intersects the second direction Y. Figure 11 and Figure 12 This illustration uses the first direction X as the column direction and the second direction Y as the row direction as an example. Figure 13 and Figure 14 This illustration uses the first direction X as the row direction and the second direction Y as the column direction as an example.

[0128] The first electrode block 6 includes a first electrode portion 20 and a second electrode portion 21 arranged along the first direction X. The width of the first electrode portion 20 in the second direction Y is smaller than the width of the second electrode portion 21 in the second direction Y. The second electrode block 9 includes a third electrode portion 22 and a fourth electrode portion 23 arranged along the first direction X. The width of the third electrode portion 22 in the second direction Y is greater than the width of the fourth electrode portion 23 in the second direction Y.

[0129] In this embodiment, the touch structure 3 can be either a self-capacitive touch structure or a mutual-capacitive touch structure. When the touch structure 3 is a self-capacitive touch structure, when a finger touches it, the human body capacitance acts on the touch structure 3, and the capacitance of the self-capacitance of the first touch electrode 4 and the second touch electrode 5 at the touch position changes. Then, based on the touch detection signal fed back by the touch signal line 8 connected to the first touch electrode 4 and the second touch electrode 5, the coordinates of the touch point are determined. When the touch mode is a mutual-capacitive touch structure, adjacent first electrode blocks 6 and second electrode blocks 9 form mutual capacitance at the slit. When a finger touches it, the capacitance of the mutual capacitance at the touch position changes. Then, based on the touch detection signal fed back by the touch signal line 8 connected to the first touch electrode 4 and the second touch electrode 5, the coordinates of the touch point are determined.

[0130] In the above structure, since the widths of the first electrode block 6 and the second electrode block 9 differ at different positions, the capacitance changes of the first electrode block 6 or the second electrode block 9 vary depending on the position of the finger touching it in the first direction X. Especially in self-capacitive touch systems, the coordinate position of the finger in the first direction X can be accurately determined based on the capacitance change of the first electrode block 6 or the second electrode block 9, improving detection accuracy and reducing the risk of misjudgment. Therefore, while achieving high touch accuracy, the embodiments of this application can increase the size of the first electrode block 6 and the second electrode block 9 in the first direction X, thereby reducing the number of electrode blocks required in the touch display device and correspondingly reducing the number of touch signal lines 8 connected to them.

[0131] As can be seen, the above structure can effectively reduce the number of touch channels, and the number of analog front-end devices (AFEs) and touch driver chips 10 used to process touch signals in the touch display device can be reduced accordingly. Especially for large-size touch display devices, the number of touch signal channels and touch driver chips 10 can be reduced to a greater extent, effectively simplifying the cost requirements and architecture of the touch display device. Moreover, compared to Figure 3 The existing structure shown above does not require a cutout area in the electrode block, thus avoiding touch problems caused by the touch gap between the common electrode and the touch electrode in the cutout area.

[0132] Furthermore, by reducing the number of touch signal lines 8 and touch driver chips 10, the space required for touch signal lines 8 and touch driver chips 10 within the bezel of the touch display panel 1 is further reduced, which is more conducive to realizing the narrow bezel design of the touch display device.

[0133] Furthermore, to further improve the detection accuracy of the finger's coordinate position in the first direction X, please refer again... Figure 12 and Figure 14 Along the first direction X, the width of the first electrode block 6 increases in the second direction Y, and the width of the second electrode block 9 decreases in the second direction Y. At this time, the first electrode block 6 and the second electrode block 9 can be trapezoidal or triangular.

[0134] Furthermore, please refer again to 11 and Figure 13 The touch signal line includes a first end 15 and a second end 16. The first end 15 is electrically connected to the touch driver chip 10, and the second ends 16 of the multiple touch signal lines 8 are aligned.

[0135] In the above configuration, regardless of whether the touch signal line 8 is connected to the first electrode block 6 or the second electrode block 9 on the side away from the touch driver chip 10, or to the side close to the touch driver chip 10, the touch signal line 8 extends from the top of the touch area 2 away from the touch driver chip 10 to the location of the touch driver chip 10. At this time, the extension length of the multiple touch signal lines 8 tends to be consistent, which effectively improves the load uniformity of the touch signal lines 8, and thus improves the voltage drop consistency of the touch detection signal or common voltage signal transmitted on different touch signal lines 8.

[0136] In one implementation, please refer again. Figure 8 , Figure 9 and Figure 15 , Figure 15 for Figure 11 Another schematic diagram of the corresponding touch structure shows that the first touch electrode 4 and the second touch electrode 5 are reused as a common electrode. The touch display panel 1 also includes sub-pixels 11, such as red sub-pixels for emitting red light, green sub-pixels for emitting green light, and blue sub-pixels for emitting blue light. Each sub-pixel 11 includes a pixel electrode 12, and the orthographic projection of each pixel electrode 12 on the plane of the touch display panel 1 lies within the orthographic projection of the first touch electrode 4 or the second touch electrode 5 on the plane of the touch display panel 1. It should be noted that... Figure 12 and Figure 14 The rectangular shape of the pixel electrode 12 shown is for illustrative purposes only. In other optional embodiments of this application, the pixel electrode 12 may also be a comb-shaped structure.

[0137] When the first touch electrode 4 and the second touch electrode 5 are reused as a common electrode, the first touch electrode 4 and the second touch electrode 5 can be patterned from a common electrode covering the entire surface. At this time, a frame time includes a touch period and a display period. During the touch period, touch detection signals are transmitted on the first touch electrode 4 and the second touch electrode 5, and the first touch electrode 4 and the second touch electrode 5 are used for touch detection. During the display period, the first touch electrode 4 and the second touch electrode 5 are used as a common electrode, and a common voltage signal is transmitted on the first touch electrode 4 and the second touch electrode 5. An electric field is formed between the pixel electrode 12 of each sub-pixel 11 and the first touch electrode 4 or the second touch electrode 5 that overlaps with it. The liquid crystal molecules rotate under the action of the electric field, thereby realizing the display of the image.

[0138] By ensuring that the orthographic projection of the pixel electrode 12 of each sub-pixel 11 is located within the orthographic projection of the first touch electrode 4 or the second touch electrode 5, it is possible to avoid situations where some pixel electrodes 12 do not overlap with the touch electrode, or where a portion of a touch electrode overlaps with the touch electrode while the rest does not. This ensures that the pixel electrode 12 of each sub-pixel 11 and its corresponding common electrode completely overlap, thereby ensuring that a uniform electric field can be formed between the pixel electrode 12 of each sub-pixel 11 and the common electrode, improving the accuracy of the rotation angle of the liquid crystal molecules, and thus improving the display effect.

[0139] Furthermore, please see again Figure 8 , Figure 9 and Figure 15 There is a gap 13 between the orthographic projections of any two adjacent pixel electrodes 12 on the plane of the touch display panel 1. In the direction of the plane of the touch display panel 1, the edge of the orthographic projection of the first touch electrode 4 and the edge of the orthographic projection of the second touch electrode 5 are located within the gap 13. This ensures that the orthographic projection of the touch electrode can completely cover the orthographic projection of each pixel electrode 12, while also leaving a gap between the edge of the orthographic projection of the touch electrode and the edge of the orthographic projection of the pixel electrode 12. Even if the setting position of the touch electrode or the pixel electrode 12 is slightly deviated due to factors such as process errors, the orthographic projection of the touch electrode can still cover the orthographic projection of the pixel electrode 12, thus improving the reliability of the relative positional relationship between the pixel electrode 12 and the touch electrode.

[0140] It should be noted that when the orthographic projection of each pixel electrode 12 on the plane of the touch display panel 1 is located within the orthographic projection of the first touch electrode 4 or the second touch electrode 5 on the plane of the touch display panel 1, the patterning design of the first touch electrode 4 and the second touch electrode 5 can be adaptively adjusted according to the arrangement of the sub-pixels 11.

[0141] In one embodiment, the patterns of multiple first electrode blocks 6 after translation overlap, and the patterns of multiple second electrode blocks 9 after translation overlap. That is, the first electrode blocks 6 included in the first touch electrode 4 have the same shape and area, and the second electrode blocks 9 included in the second touch electrode 5 also have the same shape and area. This arrangement makes the arrangement of the touch electrodes within the entire panel more regular. During touch detection, it is easier to convert the positions of the first touch electrodes 4 and second touch electrodes 5 within the panel into touch point coordinates, resulting in lower computational complexity and more accurate touch point coordinate calculations.

[0142] Based on the specific structure of the aforementioned touch display device. Figure 16 This is a flowchart illustrating the design concept of the touch display device provided in an embodiment of the present invention, as shown below. Figure 16 As shown, the design concept of the touch display device in this embodiment of the invention is as follows:

[0143] Step H1: Based on the size of the touch display panel 1, divide the touch area 2, and design the size parameters of the first touch electrode 4 and the second touch electrode 5 in the touch structure 3.

[0144] Specifically, based on the length and width of the touch display panel 1, the pitch between the center points of two adjacent first electrode blocks 6 in the first touch electrode 4 and the pitch between the center points of two adjacent second electrode blocks 9 in the second touch electrode 5 are designed.

[0145] Step H2: Determine whether the touch display device should prioritize touch performance requirements or cost and architecture requirements. If touch performance requirements are prioritized, the touch structure 3 can be designed as a small matrix touch structure 3, such as a 4*4 (touch structure 3 includes four rows of first touch electrodes 4 and four columns of second touch electrodes 5), a 3*3 (touch structure 3 includes three rows of first touch electrodes 4 and three columns of second touch electrodes 5), or a 4*2 (touch structure 3 includes four rows of first touch electrodes 4 and two columns of second touch electrodes 5) matrix touch structure 3, to improve performance. The touch detection accuracy under multi-finger touch control; if cost and architecture requirements are given priority, the touch structure 3 can be designed as a medium or large matrix touch structure 3, such as a 10*10 (touch structure 3 includes ten rows of first touch electrodes 4 and ten columns of second touch electrodes 5) or a 20*20 (touch structure 3 includes twenty rows of first touch electrodes 4 and twenty columns of second touch electrodes 5) matrix touch structure 3, so as to reduce the number of touch channels and the number of touch driver chips 10 to the greatest extent possible under the premise that the driver chip can match the maximum load.

[0146] Step H3: Based on the arrangement of pixel electrodes 12 in sub-pixels 11 of the touch display panel 1, the first touch electrode 4 and the second touch electrode 5 are patterned.

[0147] Specifically, when the pixel electrodes 12 in the sub-pixel 11 are arranged in a matrix, the first electrode block 6 and the second electrode block 9 can be designed as an approximately rhomboid structure with serrated edges to ensure that the orthographic projection of the pixel electrode 12 on the plane of the touch display panel 1 is entirely within the orthographic projection of the first touch electrode 4 and the second touch electrode 5 on the plane of the touch display panel 1. Furthermore, all the first electrode blocks 6 can be designed as electrode blocks of the same shape and size, and all the second electrode blocks 9 can be designed as electrode blocks of the same shape and size.

[0148] Based on the same inventive concept, embodiments of the present invention also provide a touch detection method, which is applied to the aforementioned touch display device, in conjunction with... Figures 4-6The touch detection method includes: the touch driver chip 10 collects the touch detection signal transmitted by the touch signal line 8, detects the touch status at the location of each touch structure 3 in the touch area 2, and calculates the coordinates of the touch point based on the collected touch detection signal.

[0149] Based on the above analysis of the structure of the touch display device, by dividing the touch display panel 1 into regions and setting multiple independent touch structures 3 in each divided touch area 2, each independent touch structure 3 corresponds to a small detection area. The touch driver chip 10 can detect the touch situation in the detection area of ​​each touch structure 3 individually. Especially when multi-finger touch is performed in a large-size touch display device, multiple fingers are more likely to be placed in the detection areas of different touch structures 3. Therefore, when the touch driver chip 10 judges each detection area individually, it is easier to accurately obtain the point coordinates of different finger touch positions, reduce the risk of misjudgment, and improve the accuracy of touch detection.

[0150] Moreover, in this embodiment of the invention, the touch driver chip 10 only needs to receive the touch detection signal fed back from the touch signal line 8 connected to it to detect the touch status in the touch area 2. There is no need to perform time-division detection, the detection time is shorter, and the time loss caused by switching touch switches during time-division detection can be avoided. When the touch electrode and the common electrode are reused, the refresh rate of touch and display is effectively improved, and the touch and display effects are better.

[0151] In one implementation, Figure 17 The flowchart of the touch detection method provided in the embodiments of the present invention is as follows: Figure 17 As shown, the process by which the touch driver chip 10 collects the touch detection signal transmitted by the touch signal line 8, detects the touch status at the locations of each touch structure 3 in the touch area 2, and calculates the coordinates of the touch point based on the collected touch detection signal includes:

[0152] Step S1: Based on the current application status of the touch display panel 1, determine whether multi-finger touch is required. If yes, proceed to step S2; otherwise, proceed to step S3.

[0153] For example, if the current application state of the touch display panel 1 is desktop, it means that the user needs to select and enter a certain software (APP) within the desktop. At this time, it can be determined that the current touch mode is single-finger touch. If the current application state of the touch display panel 1 is drawing application state or game application state, the user needs to use multi-finger touch to control drawing and game control. At this time, it can be determined that the current touch mode is multi-finger touch.

[0154] Step S2: Based on the interface currently displayed on the touch display panel 1, determine the touch area 2 that the finger needs to touch. The touch driver chip 10 corresponding to this touch area 2 collects the touch detection signal and calculates the coordinates of the touch point based on the collected touch detection signal.

[0155] Based on the one-to-one correspondence between the touch area 2 and the touch driver chip 10, when performing multi-finger touch, if the position to be touched by multiple fingers is only located in one or a few touch areas 2, touch detection can be performed using only the touch driver chip 10 corresponding to the part of the touch area 2 where the touch position is located, without all touch driver chips 10 needing to work, thereby saving the power consumption required for touch detection.

[0156] Step S3: Each touch driver chip 10 collects touch detection signals and determines whether the touch occurs in the corresponding touch area 2. If so, the touch driver chip 10 corresponding to the touch area 2 where the touch occurred calculates the coordinates of the touch point based on the collected touch detection signals.

[0157] For example, the current application state of the touch display panel 1 is the desktop state. The user needs to use a single finger touch to select an APP on the desktop. Since it is impossible to predict which APP the user will select, it is impossible to predict the position of the touch area 2 that the finger needs to touch. Therefore, by having all touch driver chips 10 detect the touch situation in their respective touch areas 2, the detection accuracy of single finger touch can be improved.

[0158] In one implementation, Figure 18 This is another flowchart of the touch detection method provided in the embodiments of the present invention, as follows: Figure 18 As shown, step S2 may specifically include:

[0159] Step S21: Based on the interface displayed on the touch display panel 1, determine whether the positions that multiple fingers need to touch belong to the same touch area 2. If yes, proceed to step S22; otherwise, proceed to step S23.

[0160] Step S22: The touch driver chip 10 corresponding to the touch area 2 collects the touch detection signal and calculates the coordinates of multiple touch points corresponding to multiple fingers based on the collected touch detection signal.

[0161] Step S23: In the multiple corresponding touch areas 2, the touch driver chip 10 corresponding to each touch area 2 collects touch detection signals. When at least two touch driver chips 10 collect edge touch detection signals containing touch information, the touch detection signals collected by the at least two touch driver chips 10 are combined to calculate the touch point coordinates. When none of the touch driver chips 10 collects edge touch detection signals containing touch information, each touch driver chip 10 calculates the touch point coordinates according to the collected touch detection signals.

[0162] It should be noted that the edge touch detection signal refers to the touch detection signal transmitted by the second touch electrode 5 at the edge of the touch area 2. For example, it can be the touch detection signal transmitted by 1 to 2 rows of second touch electrodes 5 near the edge of the touch area 2. When at least two touch driver chips 10 collect edge touch detection signals containing touch information, it indicates that a finger is simultaneously touching two adjacent touch areas 2. At this time, the touch information of the same finger is collected by at least two different touch driver chips 10. Therefore, the touch detection signals collected by these at least two touch driver chips 10 can be combined to calculate the touch point coordinates, thereby improving the accuracy of touch point coordinate calculation under multi-finger touch.

[0163] Furthermore, within each frame, the touch driver chip 10 records the calculated touch point coordinates and the region position data of the touch area 2 where the touch occurred. When at least two touch driver chips 10 acquire edge touch detection signals containing touch information, the touch detection method further includes: correcting the touch point coordinates calculated in the current frame based on the recorded touch point coordinates and region position data of the previous frame to obtain the actual touch point coordinates of the current frame.

[0164] Considering the possibility of misjudgment, when at least two touch driver chips 10 collect edge touch detection signals containing touch information, the coordinates of multiple touch points calculated in the current frame may contain misjudged coordinates. In this case, the coordinates of the touch points calculated in the current frame can be corrected by combining the touch situation of the previous frame to obtain more accurate coordinate values ​​and avoid triggering positions that have not been touched.

[0165] In addition, the touch detection method provided in this embodiment of the invention may further include: obtaining the final touch coordinates based on the touch point coordinates calculated by the touch algorithm and the touch driver chip 10.

[0166] In this embodiment of the invention, multiple touch driver chips 10 are provided. During touch detection, the multiple touch driver chips 10 perform independent calculations. Therefore, after the touch point coordinates are calculated, the touch algorithm can be used to perform secondary calculations on the multiple touch point coordinates to verify the touch point coordinates and improve the accuracy of the finally determined touch position.

[0167] Furthermore, it should be noted that the touch structure 3 provided in this embodiment of the invention can perform only self-capacitive touch, only mutual capacitive touch, or both self-capacitive and mutual capacitive functions. The appropriate touch mode can be selected before touch detection. For example, when self-capacitive touch is selected for the touch structure 3, both the first touch electrode 4 and the second touch electrode 5 are self-capacitive touch electrodes. During touch detection, the first touch electrode 4 and the second touch electrode 5 feed back touch detection signals to the touch driver chip 10 through the touch signal line 8 connected to them. When mutual capacitive touch structure 3 is selected, the first touch electrode 4 is a sensing touch electrode, and the second touch electrode 5 is a driving touch electrode. During touch detection, the touch driver chip 10 transmits touch driving detection signals to the second touch electrode 5 connected to it through the touch signal line 8, and the first touch electrode 4 feeds back touch sensing detection signals to the touch driver chip 10 through the touch signal line 8 connected to it.

[0168] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A touch display device, characterized in that, The touch display device comprises: a touch display panel comprising at least two touch areas, the touch area comprising a plurality of touch structures, the touch structure comprising a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, the first touch electrodes and the second touch electrodes being in the same layer and insulated from each other, the first direction intersecting the second direction; wherein the first touch electrode comprises a plurality of first electrode blocks arranged along the second direction, the adjacent two first electrode blocks being connected through a connecting part, and one first touch electrode being electrically connected with one touch signal line; the second touch electrode comprises a plurality of second electrode blocks arranged along the first direction, and a plurality of second electrode blocks in one second touch electrode being electrically connected with one touch signal line; at least two touch drive chips, one touch drive chip being electrically connected with the touch signal line connected with the touch structure in one touch area.

2. The touch display device according to claim 1, wherein the touch display panel comprises a plurality of touch areas, and the plurality of touch areas are arranged along the second direction.

3. The touch display device according to claim 1 or 2, wherein a normal projection of the touch signal line on a plane where the touch display panel is located penetrates a normal projection of a plurality of first touch electrodes arranged along the first direction in the touch display panel on the plane where the touch display panel is located.

4. The touch display device according to claim 1, wherein the first touch electrode and the second touch electrode are multiplexed as a common electrode; the touch display panel further comprises a sub-pixel, and the sub-pixel comprises a pixel electrode, and a normal projection of each pixel electrode on the plane where the touch display panel is located is located in a normal projection of the first touch electrode or the second touch electrode on the plane where the touch display panel is located.

5. The touch display device according to claim 4, wherein any adjacent two pixel electrodes have a gap between their normal projections on the plane where the touch display panel is located, and an edge of the first touch electrode has a normal projection on the plane where the touch display panel is located, and an edge of the second touch electrode has a normal projection on the plane where the touch display panel is located.

6. The touch display device according to claim 1, wherein a plurality of first electrode blocks have a pattern after translation, and a plurality of second electrode blocks have a pattern after translation.

7. A touch display device, comprising: The touch display device comprises: a touch display panel comprising a plurality of touch areas, the touch area comprising a first touch area and a second touch area, and the first touch area and the second touch area comprising a plurality of touch structures, respectively. a plurality of touch driving chips, the touch driving chips comprising a first touch chip and a second touch chip, the first touch chip being electrically connected with touch signal lines connected with the touch structures in the first touch region, and the second touch chip being electrically connected with touch signal lines connected with the touch structures in the second touch region; the touch structures comprising a plurality of first touch electrodes and a plurality of second touch electrodes, the plurality of first touch electrodes being arranged along a first direction, and the plurality of second touch electrodes being arranged along a second direction, the first touch electrodes and the second touch electrodes being arranged in the same layer and insulated from each other, the first direction intersecting the second direction; the first touch electrodes comprising a plurality of first electrode blocks arranged along the second direction, two adjacent first electrode blocks being connected through a connection part, and one first touch electrode being electrically connected with one touch signal line; and the second touch electrodes comprising a plurality of second electrode blocks arranged along the first direction, a plurality of second electrode blocks in one second touch electrode being electrically connected with one touch signal line; alternatively, the touch structures comprising a plurality of first touch electrodes and a plurality of second touch electrodes, the first touch electrodes and the second touch electrodes being alternately arranged along the second direction; the first touch electrodes comprising first electrode blocks arranged along the first direction, one first electrode block being electrically connected with one touch signal line, and the second touch electrodes comprising second electrode blocks arranged along the first direction, one second electrode block being electrically connected with one touch signal line; wherein the first electrode blocks comprise first electrode parts and second electrode parts arranged along the first direction, the width of the first electrode parts in the second direction being smaller than the width of the second electrode parts in the second direction, and the second electrode blocks comprise third electrode parts and fourth electrode parts arranged along the first direction, the width of the third electrode parts in the second direction being greater than the width of the fourth electrode parts in the second direction.

8. The touch display device of claim 7, wherein the plurality of touch regions are arranged along the same direction, and the arrangement direction of the touch regions intersects the extension direction of the touch signal lines.

9. The touch display device of claim 7, wherein in the touch structures, the plurality of first touch electrodes are arranged along a first direction, and the plurality of second touch electrodes are arranged along a second direction; and in the direction of the plane of the touch display panel, the orthogonal projection of the touch signal lines passes through the orthogonal projection of the plurality of first touch electrodes arranged along the first direction in the touch display panel.

10. The touch display device of claim 7, wherein in the touch structures, the first touch electrodes and the second touch electrodes are alternately arranged along the second direction; and along the first direction, the width of the first electrode blocks in the second direction increases, and the width of the second electrode blocks in the second direction decreases.

11. The touch display device of claim 7, wherein ​ ​ The first touch electrode and the second touch electrode are arranged alternately in the second direction in the touch structure; the touch signal line comprises a first end portion and a second end portion, the first end portion is electrically connected with the touch driving chip, and the second end portions of the plurality of touch signal lines are aligned.

12. A touch detection method, comprising: The touch detection method is applied to the touch display device as claimed in any one of claims 1-6, comprising: The touch driving chip collects the touch detection signal transmitted by the touch signal line, detects the touch condition at the position of each touch structure in the touch area, and calculates the touch point coordinates according to the collected touch detection signal.

13. The touch detection method of claim 12, wherein, The process that the touch driving chip collects the touch detection signal transmitted by the touch signal line, detects the touch condition at the position of each touch structure in the touch area, and calculates the touch point coordinates according to the collected touch detection signal comprises: Step S1: judging whether multi-finger touch is needed according to the current application state of the touch display panel, if yes, entering step S2, if no, entering step S3; Step S2: judging the touch area that the fingers need to touch according to the interface currently displayed by the touch display panel, the touch driving chip corresponding to the part of the touch area collects the touch detection signal, and calculates the touch point coordinates according to the collected touch detection signal; Step S3: each touch driving chip collects the touch detection signal and judges whether touch occurs in the corresponding touch area, if yes, the touch driving chip corresponding to the touch area where touch occurs calculates the touch point coordinates according to the collected touch detection signal.

14. The touch detection method of claim 13, wherein, Step S2 comprises: Step S21: judging whether the positions that the fingers need to touch belong to the same touch area according to the interface displayed by the touch display panel, if yes, entering step S22, if no, entering step S23; Step S22: the touch driving chip corresponding to the touch area collects the touch detection signal, and calculates the touch point coordinates according to the collected touch detection signal; Step S23: in the plurality of touch areas, the touch driving chip corresponding to each touch area collects the touch detection signal, when at least two touch driving chips collect the edge touch detection signal containing touch information, the touch detection signals collected by the at least two touch driving chips are combined to calculate the touch point coordinates, when the touch driving chip does not collect the edge touch detection signal containing touch information, each touch driving chip calculates the touch point coordinates according to the collected touch detection signal.

15. The touch detection method according to claim 14, wherein, In each frame of time, the touch driving chip records the calculated touch point coordinates and the area position data of the touch area where touch occurs; When at least two touch driving chips collect the edge touch detection signal containing touch information, the touch detection method further comprises: correcting the touch point coordinates calculated in the current frame according to the recorded touch point coordinates and area position data in the last frame to obtain the actual touch point coordinates in the current frame.

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