CN114585994B - Touch substrate, touch module and touch display device - Google Patents

The touch substrate, the touch module and the touch display device can comprise a substrate (50) and a touch sensing layer; the touch sensing layer is formed on the substrate (50) and comprises a plurality of touch electrode groups (51) which are arranged in an array; each touch electrode group (51) comprises a first touch electrode (510) and a second touch electrode which are arranged at intervals along a first direction and are mutually insulated; the first touch electrodes (510) in each touch electrode group (51) are mutually insulated; the second touch electrodes in each touch electrode group (51) comprise sub-electrodes (511) which are arranged at intervals along the second direction and are insulated from each other, and the sub-electrodes (511) of the second touch electrodes in at least two groups of touch electrode groups (51) are connected in a one-to-one correspondence manner through wires (52); wherein the first direction and the second direction are mutually perpendicular; and the first touch electrode (510), the second touch electrode and the wire (52) are positioned on the same layer. The scheme can realize whole-surface single-layer wiring so as to avoid the condition of overhigh cost, and can also reduce the number of channels while identifying multi-point touch.

Touch substrate, touch module and touch display device

Technical Field

The embodiment of the disclosure relates to the technical field of touch control, in particular to a touch control substrate, a touch control module and a touch control display device.

Background

With the rapid development of display technology, capacitive touch display devices have gradually spread throughout people's lives. At present, a capacitive touch display device utilizes a mutual capacitance or self-capacitance principle to realize detection of a touch position, but no matter the mutual capacitance principle or the self-capacitance principle is utilized to realize detection of the touch position, the conventional capacitive touch display device has certain problems, such as: excessive channel number, poor touch performance, high cost and the like.

Disclosure of Invention

The embodiment of the disclosure provides a touch substrate, a touch module and a touch display device, which have the advantages of less channels, good touch performance, low cost and the like.

In one embodiment of the present disclosure, there is provided a touch substrate including: a substrate and a touch sensing layer arranged on the substrate, wherein,

The touch sensing layer comprises a plurality of touch electrode groups which are arranged in an array; each touch electrode group comprises a first touch electrode and a second touch electrode which are arranged at intervals along a first direction and are mutually insulated;

The first touch electrodes in each touch electrode group are mutually insulated;

the second touch electrodes in each touch electrode group comprise a plurality of sub-electrodes which are arranged at intervals along the second direction and are insulated from each other, and the sub-electrodes of the second touch electrodes in at least two groups of touch electrode groups are connected in one-to-one correspondence through wires;

Wherein the first direction and the second direction are mutually perpendicular; and the first touch electrode, the second touch electrode and the lead are positioned on the same layer.

In an embodiment of the disclosure, the number of the sub-electrodes of the second touch electrode in each touch electrode group is equal to K; k is an integer greater than or equal to 2;

The ith sub-electrode of the second touch electrode in at least two groups of touch electrode groups is connected through a wire, i is more than or equal to 1 and less than or equal to K, and i is an integer.

In one embodiment of the disclosure, in the first direction, the touch electrode group is provided with M columns; in the second direction, the touch electrode group is provided with N rows; wherein N, M is an integer greater than or equal to 2;

The ith sub-electrode of the second touch electrode in the nth row and the mth column of touch electrode group is connected with the ith sub-electrode of the second touch electrode in the (n+1) th row and the (m+1) th column of touch electrode group through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than M, and N and M are integers.

In one embodiment of the disclosure, the n+1th row of touch electrode sets is disposed closer to the flexible circuit board than the n th row of touch electrode sets;

In the direction from the nth row to the n+1th row, the sizes of the plurality of sub-electrodes of the second touch electrode in each touch electrode group in the first direction are sequentially reduced.

In one embodiment of the disclosure, in the first direction, the touch electrode group is provided with M columns; in the second direction, the touch electrode group is provided with N rows; wherein N, M is an integer greater than or equal to 2;

the ith sub-electrode of the second touch electrode in the nth row and the mth column of touch electrode group is connected with the ith sub-electrode of the second touch electrode in the (n+1) th row and the mth column of touch electrode group through a wire; wherein N is more than or equal to 1 and less than or equal to N, M is more than or equal to 1 and less than or equal to M, and N and M are integers.

In one embodiment of the disclosure, the n+1th row of touch electrode sets is disposed closer to the flexible circuit board than the n th row of touch electrode sets;

the size of each first touch electrode in the first direction sequentially decreases from the nth row to the n+1th row.

In one embodiment of the disclosure, in the first direction, the touch electrode group is provided with M columns; in the second direction, the touch electrode group is provided with N rows; wherein N is an integer greater than or equal to 2, and M is an integer greater than or equal to 3;

The ith sub-electrode of the second touch electrode in the (n+1) th row and (m-1) th column of touch electrode group, the ith sub-electrode of the second touch electrode in the (n) th row and (m) th column of touch electrode group, and the ith sub-electrode of the second touch electrode in the (n+1) th row and (m+1) th column of touch electrode group are connected through a wire; wherein N is more than or equal to 1 and less than or equal to N, M is more than or equal to 2 and less than or equal to M-1, and N and M are integers.

In one embodiment of the disclosure, in the 1 st row, the ith sub-electrode of the second touch electrode in the m-1 st column of touch electrode groups is connected with the ith sub-electrode of the second touch electrode in the m+1 st column of touch electrode groups through a wire, wherein N is greater than or equal to 3, and m is greater than or equal to 4.

In one embodiment of the disclosure, in the nth row, an ith sub-electrode of the second touch electrode in the mth column of the touch electrode group is connected with an ith sub-electrode of the second touch electrode in the (m+2) th column of the touch electrode group through a wire, wherein N is greater than or equal to 3, and m is greater than or equal to 4.

In one embodiment of the disclosure, a flexible circuit board is disposed on one side of the touch substrate in the second direction; in each touch electrode group, one end, close to the flexible circuit board, of the sub-electrodes closest to the flexible circuit board in the second touch electrode is flush with one end, close to the flexible circuit board, of the first touch electrode; and one end, far away from the flexible circuit board, of the sub-electrodes farthest from the flexible circuit board is flush with one end, far away from the flexible circuit board, of the first touch electrode.

In one embodiment of the present disclosure, in the second direction, a pitch between adjacent ones of the touch electrode groups is 6 μm to 300 μm;

in a first direction, a spacing between the first touch electrode block and the second touch electrode block is 6 μm to 300 μm.

In one embodiment of the disclosure, the first touch electrode and the second touch electrode are self-contained touch electrodes.

In one embodiment of the disclosure, the first touch electrode is a transmitting electrode and the second touch electrode is a receiving electrode.

In one embodiment of the present disclosure, there is provided a touch module, including:

A flexible circuit board having a plurality of pins;

The touch substrate of any one of the above, wherein each of the first touch electrodes is electrically connected to one of the pins through a lead; the plurality of sub-electrodes sequentially connected through the lead are taken as a whole and are electrically connected with one pin through a lead.

In an embodiment of the disclosure, a touch display device is provided, which includes a display module and the above touch module, where the touch module is disposed on one side of the display module.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, without limitation to the disclosure. The above and other features and advantages will become more readily apparent to those skilled in the art by describing in detail exemplary embodiments with reference to the attached drawings, in which:

FIG. 1 is a schematic diagram of a touch substrate described in the related art;

Fig. 2 is a schematic diagram of a touch substrate according to an embodiment of the disclosure;

FIG. 3 is an enlarged schematic view of portion A shown in FIG. 2;

FIG. 4 is a schematic diagram of a touch substrate according to an embodiment of the disclosure in a touch situation;

FIG. 5 is a schematic diagram of a touch substrate according to an embodiment of the disclosure under another touch condition;

FIG. 6 is a simplified schematic diagram of a touch substrate according to an embodiment of the disclosure;

FIG. 7 is a schematic diagram illustrating connection between a touch substrate and a flexible circuit board according to an embodiment of the disclosure;

FIG. 8 is a simplified schematic diagram of a touch substrate according to another embodiment of the disclosure;

fig. 9 is a schematic diagram illustrating connection between a second touch electrode and a flexible circuit board in a touch substrate according to another embodiment of the disclosure;

FIG. 10 is a simplified schematic diagram of a touch substrate according to another embodiment of the disclosure;

Fig. 11 is a schematic diagram illustrating connection between a second touch electrode and a flexible circuit board in a touch substrate according to another embodiment of the disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.

In the related art, the touch substrate is often a self-contained single-layer multi-point architecture: the whole surface is divided into P (number of rows) x Q (number of columns) units, as shown in FIG. 1, each unit is a touch sensing unit 100, and each touch sensing unit 100 corresponds to one channel, so that the whole surface touch sensing unit 100 is more (i.e. P x Q units) in design, the number of channels is more, the number of leads 101 is more, the wiring of a fan-out (fanout) area (not shown in the figure) is limited, and SLOC (SINGLE LAYER On Cell, a single-layer pattern is On glass) products are not applicable.

Based on the foregoing, the above-mentioned provided touch substrate has certain problems, such as: excessive channel number, poor touch performance, high cost and the like.

To solve the foregoing problems, an embodiment of the present disclosure provides a touch substrate, as shown in fig. 2, including a substrate 50 and a touch sensing layer formed on the substrate 50, wherein:

The substrate 50 may be a single-layer or multi-layer structure; optionally, the substrate 50 of the embodiment of the disclosure has a single-layer structure, so as to reduce the thickness and cost of the touch substrate. It should be understood that the material of the substrate 50 may be selected to be an insulating material, so as to avoid the substrate 50 and the touch sensing layer from being in an electrically conductive state, thereby ensuring the normal use of the touch substrate.

The touch sensing layer may include a plurality of touch electrode groups 51 arranged in an array, as shown in fig. 2 and 3, specifically, each touch electrode group 51 may include a first touch electrode 510 and a second touch electrode that are arranged at intervals along a first direction (i.e., a row direction) X and are insulated from each other, the first touch electrode 510 in each touch electrode group 51 is a monolithic structure, and each second touch electrode in each touch electrode group 51 may include a plurality of sub-electrodes 511 that are arranged at intervals along a second direction (i.e., a column direction) Y and are insulated from each other, that is, there is no electrical connection relationship between the first touch electrode 510 and each sub-electrode 511 and between the sub-electrodes 511 in each touch electrode group 51. For example, the first touch electrode 510 and the sub-electrode 511 may have a rectangular block shape, but not limited thereto, and may have a regular shape or an irregular shape, as the case may be.

In addition, the first touch electrodes 510 are insulated from each other, that is, there is no electrical connection between the first touch electrodes 510 in each touch electrode group 51. The sub-electrodes 511 of the second touch electrodes in the at least two touch electrode sets 51 are connected in a one-to-one correspondence through wires 52, that is, there is an electrical connection between the sub-electrodes 511 of the second touch electrodes in the at least two touch electrode sets 51.

It should be noted that, in the touch sensing layer, the first touch electrode 510, the second touch electrode 511, and the conductive wire 52 may be located in the same layer, i.e.: the touch substrate of the embodiment can be wholly and singly wired. For example, a one-time patterning process may be employed, wherein the one-time patterning process may include photoresist coating, exposure, development, etching, photoresist stripping, and the like.

In the embodiment of the present disclosure, the first touch electrodes 510 of each touch electrode group 51 in the touch substrate are insulated from each other, that is: each first touch electrode 510 may correspond to a channel and be electrically connected to a pin of a flexible circuit board (Flexible Printed Circuit, abbreviated as FPC) through a lead; and the plurality of sub-electrodes 511 electrically connected together by the conductive wires 52 may be as a whole, namely: the channel is electrically connected with one pin of the flexible circuit board through one lead, so that the number of the channels can be reduced by design, and the number of the leads can be reduced, so that the situation that the wiring of the fanout area is limited is relieved.

In addition, the touch substrate of the embodiment can be entirely and singly routed, so that the number of layers of the touch substrate can be reduced (namely, the number of layers is reduced from four layers to two layers), and a punching process can be omitted, thereby reducing the process cost and improving the product yield.

It should be noted that, in the embodiment of the disclosure, as shown in fig. 4, one first touch electrode 510 corresponds to a plurality of second touch electrodes 511 belonging to different channels; as shown in fig. 5, the sub-electrodes 511 of the same channel respectively correspond to the first touch electrodes 510 of different channels.

Wherein the black dots shown in fig. 4 and 5 can be understood as touch points; each touch point covers three electrodes, which are located in the same touch electrode group 51 but belong to different channels, one channel corresponds to the first touch electrode 510, and the other two channels respectively correspond to one sub-electrode 511, so that capacitance value changes of the three electrodes can be caused, and the touch position and the touch size can be accurately determined by detecting the capacitance value changes of the three electrodes. Since the detection of the touch position in the present embodiment is generally determined by a first touch electrode 510 and two sub-electrodes 511 that are adjacent and belong to different channels, even if the two touch points are relatively close, as shown in fig. 4, the sub-electrodes 511 corresponding to the two touch points are different and can be identified respectively; as shown in fig. 5, the two touch points far apart can be identified respectively because the first touch electrodes 510 corresponding to the two touch points are different; namely: the touch substrate of the embodiment can identify multi-point touch and has no ghost points, so that the touch detection efficiency and accuracy can be improved.

It should be understood that, to reduce the design difficulty of the touch substrate, the first touch electrode 510 in each touch electrode group 51 in the embodiment of the disclosure is one; the second touch electrode in each touch electrode group 51 is also one; the number of the sub-electrodes 511 of the second touch electrode in each touch electrode group 51 is plural and equal, and K is all; k is an integer greater than or equal to 2.

Optionally, in order to reduce the processing difficulty of the touch sensing layer, the ith sub-electrode 511 of the second touch electrode in at least two groups of touch electrode groups 51 is connected through a wire 52, where i is greater than or equal to 1 and less than or equal to K, and i is an integer; that is, the sub-electrodes 511 at the same position in at least two touch electrode groups 51 are connected by the conductive wires 52.

For example, as shown in fig. 3, K is equal to 4, i is preferably 1, 2, 3, 4, and 4 sub-electrodes 511 of the second touch electrode in each touch electrode group 51 can be respectively defined as a1 st sub-electrode, a2 nd sub-electrode, and a2 nd sub-electrode from top to bottom in fig. 3; the connection between the sub-electrodes 511 at the same position in the at least two touch electrode groups 51 through the conductive wires 52 can be understood as: the 1 st sub-electrode of the second touch electrode in one touch electrode group 51 is correspondingly connected with the 1 st sub-electrode of the second touch electrode in the other touch electrode group 51 through a wire 52; the 2 nd sub-electrode is correspondingly connected with the 2 nd sub-electrode of the second touch electrode in the other touch electrode group 51 through a wire 52; the 3 rd sub-electrode is correspondingly connected with the 3 rd sub-electrode of the second touch electrode in the other touch electrode group 51 through a wire 52; the 4 th sub-electrode is correspondingly connected with the 4 th sub-electrode of the second touch electrode in the other touch electrode group 51 through a wire 52.

It should be noted that the number of the sub-electrodes 511 of the second touch electrode in each touch electrode group 51 is not limited to 4 as shown in fig. 2 and 3, but may be 2,3 or more than 4.

In the embodiment of the present disclosure, as shown in fig. 2, in the row direction X, the touch electrode group 51 may be provided with M columns; in the column direction Y, the touch electrode group 51 is provided with N rows; wherein N, M is an integer greater than or equal to 2.

The following describes the touch sensing layer of the touch substrate in detail with reference to the accompanying drawings.

For example, in at least one embodiment of the present disclosure, as shown in fig. 2 to 7, the ith sub-electrode 511 of the second touch electrode in the nth row and mth column of touch electrode group 51 is connected to the ith sub-electrode 511 of the second touch electrode in the (n+1) th row and (m+1) th column of touch electrode group 51 by a conductive wire 52; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than M, and N and M are integers.

Each of the dashed boxes in fig. 6 represents the aforementioned touch electrode set 51; the rectangular block numbered with the beginning of the letter F in fig. 6 is the aforementioned first touch electrode 510; the rectangular block numbered with the beginning of the letter G in fig. 6 is the aforementioned sub-electrode 511; referring to fig. 2, 6 and 7, the same number of sub-electrodes 511 (e.g. the sub-electrodes 511 with numbers G1, G2, G3 or G4) in fig. 6 may be connected by a conductive wire 52, and the sub-electrodes 511 connected by the conductive wire 52 may be integrated and electrically connected to a lead 55 of the flexible circuit board 54 by a lead 53; in fig. 6, the first touch electrodes 510 with different numbers (e.g., the first touch electrodes 510 with the numbers of F1, F2, F10, and F11) and the sub-electrodes 511 with different numbers (e.g., the sub-electrodes 511 with the numbers of G1, G2, G3, G4, G5, G6, G7, G8, G41, G42, G43, and G44) are electrically connected to a pin 55 of the flexible circuit board 54 through a lead 53.

In the present embodiment, as can be seen from the numbers shown in fig. 6, when N is equal to 9, M is equal to 8, and each touch electrode group 51 includes 4 sub-electrodes 511 arranged at intervals in the column direction Y, the number of channels in the present embodiment may be=9×8+16×4=136, that is: each row has 9 first touch electrodes 510, and the total number of the first touch electrodes 510 is 8, namely 9×8, and 72 channels; each touch electrode group 51 has 4 sub-electrodes 511, and the sub-electrodes 511 are diagonally wired and diagonally have 16 total pieces, so that the number of the sub-electrodes is 16×4 and 64 total pieces, and thus, the touch sensing layer has 136 total channels in this embodiment. However, in the above related art, to implement the multi-touch control basically equivalent to the present embodiment, 16×36 channels are required, namely: 576 channels.

Based on this, compared with the solution described in the related art, the number of channels can be greatly reduced while substantially equivalent single-layer multi-point touch is realized, so that the number of leads can be reduced, and the problem of limited wiring in the fan-out area can be alleviated. In addition, the method and the device can reduce the processing difficulty, reduce the touch blind area, identify multi-point touch and have no ghost points while reducing the number of channels, so that the touch detection efficiency and accuracy can be improved.

It should be noted that, the display product generally includes a display area and a driving circuit area (or referred to as a peripheral circuit area, a peripheral circuit area); the driving circuit area is provided with a driving circuit for outputting signals; a display structure is arranged in the display area to display pictures; between the two areas wires for transmitting corresponding signals to the display area are arranged. In order to increase the area of the display area, the wires between the two areas are designed to concentrate towards the drive circuit area of smaller area, so that the wires between the two areas are collected into a fan-like structure, which is known as a fan-out area. It should be noted that the touch substrate is generally disposed in a display area of a display product.

The n+1th row of touch electrode group 51 is disposed closer to the flexible circuit board 54 than the n row of touch electrode group 51; in other words, the flexible circuit board 54 may be disposed at a side close to the nth row touch electrode group 51. Alternatively, as shown in fig. 2, the plurality of sub-electrodes 511 of the second touch electrode in each touch electrode group 51 may be sequentially reduced in size in the row direction X in the direction from the nth row to the n+1th row.

Since the wires 52 distributed at the positions corresponding to the sub-electrodes 511 of each touch electrode group 51 are gradually increased from the side far from the flexible circuit board 54 to the side near the flexible circuit board 54, as shown in fig. 2, the wires 52 distributed at the positions corresponding to the 1 st sub-electrode in each touch electrode group 51 are one; two wires 52 are distributed at the corresponding positions of the 2 nd sub-electrode; three wires 52 are distributed at the corresponding positions of the 3 rd sub-electrode; four wires 52 are distributed at the corresponding positions of the fourth sub-electrode; therefore, by designing the size of the sub-electrode 511 close to the flexible circuit board 54 in the row direction X to be smaller than the size of the sub-electrode 511 far from the flexible circuit board 54 in the row direction X, the touch dead zone in each touch electrode group 51 can be reduced while ensuring that each wire 52 can effectively realize connection between the sub-electrodes 511 in different touch electrode groups 51.

However, the size of each sub-electrode 511 in the row direction X of each touch electrode group 51 may be the same in the direction from the nth row to the n+1th row, wherein, in order to arrange each conductive wire within a certain interval, each sub-electrode 511 in each touch electrode group 51 may be properly shifted in sequence in the row direction X, and the shifting direction may depend on the direction of the specific conductive wire.

For example, in at least one embodiment of the present disclosure, as shown in fig. 8 to 9, the ith sub-electrode 511 of the second touch electrode in the nth row and mth column of touch electrode group 51 is connected to the ith sub-electrode 511 of the second touch electrode in the (n+1) th row and mth column of touch electrode group 51 by a wire 52; wherein N is more than or equal to 1 and less than or equal to N, M is more than or equal to 1 and less than or equal to M, and N and M are integers.

Each of the dashed boxes in fig. 8 represents the aforementioned touch electrode set 51; the rectangular block numbered with the beginning of the letter F in fig. 8 is the aforementioned first touch electrode 510; the rectangular block numbered with the beginning of the letter G in fig. 8 is the aforementioned sub-electrode 511; referring to fig. 8 and 9, the same number of sub-electrodes 511 (e.g., the sub-electrodes 511 numbered G1, G2, G3, G4) in fig. 8 may be connected by a wire 52 and electrically connected to a pin 55 of the flexible circuit board 54 through a wire 53; the first touch electrodes 510 with different numbers (e.g., the first touch electrodes 510 with the numbers of F1, F2, F3, F10, F11, F12) and the sub-electrodes 511 with different numbers (e.g., the numbers of G1, G2, G3, G4, G5, G6, G7, G8) are electrically connected with a pin 55 of the flexible circuit board 54 through a lead 53.

In the present embodiment, as can be seen from the numbers shown in fig. 8, when N is equal to 9 and M is equal to 8, and each touch electrode group 51 includes 4 sub-electrodes 511 arranged at intervals in the column direction Y, the number of channels in the present embodiment may be=9×8+8×4=104, that is: each row has 9 first touch electrodes 510, and the total number of the first touch electrodes 510 is 8, namely 9×8, and 72 channels; each touch electrode group 51 has 4 sub-electrodes 511, and the sub-electrodes 511 are wired in the row direction Y, and each row has 4 lines, 8 lines, and thus 8×4 lines, and 32 lines, so that the touch sensing layer has 104 channels in total in this embodiment. However, in the above related art, to implement the multi-touch control basically equivalent to the present embodiment, 16×36 channels are required, namely: 576 channels.

Based on this, compared with the solution described in the related art, the number of channels can be greatly reduced while substantially equivalent single-layer multi-point touch is realized, so that the number of leads can be reduced, and the problem of limited wiring in the fan-out area can be alleviated. In addition, the method and the device can reduce the processing difficulty, reduce the touch blind area, identify multi-point touch and have no ghost points while reducing the number of channels, so that the touch detection efficiency and accuracy can be improved.

The n+1th row of touch electrode group 51 is arranged close to the flexible circuit board compared with the n row of touch electrode group 51; in other words, the flexible circuit board may be disposed at a side close to the nth row touch electrode group 51. Alternatively, the dimensions of each first touch electrode 510 in the row direction X may be sequentially reduced in the direction from the nth row to the n+1th row (i.e., in the top-down direction in fig. 9); by the design, the connection between the different first touch electrodes 510 and the pins 55 in the flexible circuit board 54 can be effectively realized by the leads 53, and meanwhile, touch blind areas in each row of touch electrode groups can be reduced.

However, the size of each of the first touch electrodes 510 in the row direction X may be the same in the direction from the nth row to the n+1th row, as the case may be.

For example, in at least one embodiment of the present disclosure, as shown in fig. 10 to 11, the ith sub-electrode 511 of the second touch electrode in the n+1th row and m-1 th column of the touch electrode group 51, the ith sub-electrode 511 of the second touch electrode in the n-th row and m-th column of the touch electrode group 51, and the ith sub-electrode 511 of the second touch electrode in the n+1th row and m+1th column of the touch electrode group 51 are connected by a wire 52; wherein N is more than or equal to 1 and less than or equal to N, M is more than or equal to 2 and less than or equal to M-1, N and M are integers, and M is an integer more than or equal to 3.

Optionally, in the 1 st row, the ith sub-electrode 511 of the second touch electrode in the m-1 st column of touch electrode group 51 is connected to the ith sub-electrode 511 of the second touch electrode in the m+1 st column of touch electrode group 51 through a wire 52.

Further, in the nth row, the ith sub-electrode 511 of the second touch electrode in the mth column of touch electrode group 51 is connected to the ith sub-electrode 511 of the second touch electrode in the (m+2) th column of touch electrode group 51 through a wire 52.

Each of the dashed boxes in fig. 10 represents the aforementioned touch electrode set 51; the rectangular block numbered with the beginning of the letter F in fig. 10 is the aforementioned first touch electrode 510; the rectangular block numbered with the beginning of the letter G in fig. 10 is the aforementioned sub-electrode 511; as described in connection with fig. 11 and 12, the same number of sub-electrodes 511 (e.g., the sub-electrodes 511 numbered G1, G2, G3, … …, G15, or G16) in fig. 10 are connected by a wire 52 and electrically connected to a pin 55 of the flexible circuit board 54 via a wire 53; the first touch electrodes 510 with different numbers (e.g., the first touch electrodes 510 with the numbers of F1, F2, F3, F10, F11, F12, F19, F20, F21) and the sub-electrodes 511 with different numbers (e.g., the sub-electrodes 511 with the numbers of G1, G2, G3, … …, G15, G16) are electrically connected with a pin 66 of the flexible circuit board 54 through a lead 53.

In the present embodiment, as can be seen from the numbers shown in fig. 10, when N is equal to 9 and M is equal to 8, and each touch electrode group 51 includes 4 sub-electrodes 511 arranged at intervals in the column direction Y, the number of channels in the present embodiment may be=9×8+8×4+4×2=112, that is: each row has 9 first touch electrodes 510, and the total number of the first touch electrodes 510 is 8, namely 9×8, and 72 channels; each touch electrode group 51 has 4 sub-electrodes 511, and the sub-electrodes 511 are alternately wired in the lateral direction, and the total of the alternately wired in the lateral direction is 8×4, namely: the remaining touch electrode groups 51 of the first row and the last row are wired at intervals of 4×2 in total, namely: 8, therefore, the touch sensing layer in this embodiment has 112 channels in total. In the first embodiment, if the multi-touch control basically equivalent to the present embodiment is to be implemented, 16×36 channels are needed, namely: 576 channels.

Based on this, compared with the related art, the number of channels can be greatly reduced while the substantially equivalent single-layer multi-point touch is realized, so that the number of leads can be reduced to alleviate the problem of limited wiring in the fan-out area. In addition, the method and the device can reduce the processing difficulty, reduce the touch blind area, identify multi-point touch and have no ghost points while reducing the number of channels, so that the touch detection efficiency and accuracy can be improved.

In one embodiment of the present disclosure, as shown in fig. 7, 9 and 11, a flexible circuit board 54 is disposed on one side of the touch substrate in the column direction Y; in each touch electrode group 51, one end of the sub-electrode 511 closest to the flexible circuit board 54 in the second touch electrode, which is close to the flexible circuit board 54, is flush with one end of the first touch electrode 510, which is close to the flexible circuit board 54; one end, far away from the flexible circuit board, of the sub-electrode 511, which is farthest from the flexible circuit board 54 is flush with one end, far away from the flexible circuit board, of the first touch electrode 510, so that when the touch sensing layer is processed, the gap between the adjacent touch electrode groups 51 in the column direction Y is convenient to control, and the touch blind area can be reduced and the touch detection accuracy can be improved while the connection of the first touch electrode 510, the sub-electrode 511 and the pins of the flexible circuit board can be effectively realized by each lead.

Alternatively, in the column direction Y, the pitch between adjacent touch electrode groups 51 may be 6 μm to 300 μm; the spacing between the first touch electrode 510 and the sub-electrode 511 blocks in the row direction X may be 6 μm to 300 μm. It should be appreciated that the spacing between adjacent groups of touch electrodes 51 in the column direction Y, and the spacing between the first touch electrode 510 and the sub-electrode 511 in the row direction X are dependent on the specific process requirements.

In an alternative embodiment of the disclosure, the touch substrate can utilize the principle of self-capacitance to detect the touch position, and in detail, the first touch electrode 510 and the sub-electrode 511 can be self-capacitance touch electrodes. When part of the human body (for example, a finger) does not touch the touch substrate, the capacitance born by each capacitive touch electrode is a fixed value, and when the finger touches the touch substrate, the capacitance born by the corresponding self-capacitive touch electrode is a fixed value, the capacitance of the human body is superposed, and the touch detection chip (which can be an FPC) can judge the touch position by detecting the capacitance change of each capacitive touch electrode in the touch time period.

Because human body capacitance can act on all self-capacitance, relative to the projected capacitance in human body capacitance only can act on mutual capacitance, the touch change amount caused by human body touching the touch substrate can be larger than that of the touch substrate manufactured by utilizing the mutual capacitance principle, so that the signal-to-noise ratio (SNR) of touch can be effectively improved relative to the mutual capacitance touch substrate, and the touch performance is improved, such as: induction accuracy, linearity, etc.

It should be noted that, the touch substrate is not limited to realizing detection of a touch position by using a self-capacitance principle, and detection of a touch position can also be realized by using a mutual capacitance principle. Specifically, when the touch substrate in the embodiments of the present disclosure realizes detection of a touch position by using the principle of mutual capacitance, the first touch electrode 510 in the touch sensing layer may be a Transmitting (TX) electrode, the sub-electrode 511 may be a Receiving (RX) electrode, and a capacitance may be formed between the first touch electrode 510 and the sub-electrode 511, namely: the first touch electrode 510 and the sub-electrode 511 respectively constitute two poles of the capacitor. When a finger touches the touch substrate, coupling between the first touch electrode 510 and the sub-electrode 511 near the touch point is affected, thereby changing the capacitance between the first touch electrode 510 and the sub-electrode 511. When the mutual capacitance of the mutual capacitance type touch substrate is detected, all the first touch electrodes 510 send out excitation signals, and all the sub-electrodes 511 receive signals, so that the capacitance values between all the first touch electrodes 510 and all the sub-electrodes 511 can be obtained, namely: the capacitance of the two-dimensional plane of the whole mutual capacitance type touch substrate. And calculating the coordinates of each touch point by the mutual capacitance type touch substrate according to the two-dimensional capacitance variation data.

Taking the touch substrate of the first embodiment as an example, the inventor verifies the touch substrate, and in the verification process, the inventor adopts the FPC to verify the touch substrate, namely: binding the FPC with the touch substrate, and attaching the touch substrate bound with the FPC on an OLED (Organic Light-Emitting Diode) screen, wherein SNR (signal to noise ratio) test results are shown in the following table 1:

TABLE 1

As can be seen from table 1, when the touch substrate in the present embodiment is a mutual capacitive touch, the SNR is reduced by about 3dB from the non-display state (OLED screen off) to the display state (OLED screen on); when the touch substrate in the embodiment is self-capacitance RX type touch, the SNR is reduced by about 8dB from the non-display state (OLED screen off) to the display state (OLED screen on); in the case where the touch substrate in this embodiment is a self-capacitance TX type touch, the SNR is reduced by about 6dB from the non-display state (OLED screen off) to the display state (OLED screen on).

It should be noted that, the structure of the FPC may include a base layer, a metal wiring layer, an insulating substrate layer, and a top cover layer in order, where the base layer and the top cover layer may include an AD board and a PI (polyimide) film, where the AD board is a PVC board, and the main material is polyvinyl chloride; and the base layer and the top cover layer may have a thickness of 27.5 μm; the material of the insulating substrate layer may be PI material, and its thickness may be 25 μm; the thickness of the metal trace layer may be 22 μm.

The structure of the OLED screen can sequentially comprise a substrate, a driving circuit layer, an organic light emitting device, a packaging layer and the like. The organic light emitting device may include an anode, a light emitting material, and a cathode sequentially disposed, the anode being disposed adjacent to the substrate, and the thickness of the anode and the cathode may be 0.01 μm, and the thickness of the light emitting material may be 1.3 μm; the encapsulation layer may include an organic encapsulation layer and an inorganic encapsulation layer disposed in sequence, the organic encapsulation layer being disposed adjacent to the substrate, the organic encapsulation layer may have a thickness of 8 μm, which may be formed by an inkjet printing process (IJP); the thickness of the inorganic encapsulation layer may be 0.6 μm, and the material thereof may be silicon nitride or the like.

In another embodiment of the present disclosure, a touch module is further provided, as shown in fig. 7, 9 and 11, which includes a flexible circuit board 54 and the touch substrate described in any of the foregoing embodiments, wherein: the flexible circuit board 54 may have a plurality of pins 55, and alternatively, the flexible circuit board 54 may be disposed at one side of the touch substrate, and in particular, the flexible circuit board may be disposed at one side of the touch substrate in the column direction Y, but is not limited thereto.

Each first touch electrode 510 in the touch substrate is electrically connected to a pin 55 through a lead 53; the plurality of sub-electrodes 511 sequentially connected via the lead 52 may be integrated and electrically connected to a lead 55 via a lead 53. It should be noted that, if the touch substrate includes the sub-electrode 511 that is not connected to the conductive wire 52, the sub-electrode 511 may be electrically connected to a pin 55 of the flexible circuit board 54 through a lead 53 alone. The flexible circuit board 54 can determine the touch position by detecting the capacitance change at each touch electrode during the touch time period.

In still another embodiment of the present disclosure, a touch display device is provided, which may include a display module and the touch module described above, where the touch module is disposed on one side of the display module. Optionally, the touch module may be disposed on a display side of the display module. The display module can be OLED display or LCD (liquid crystal display).

It should be noted that, the specific type of the touch display device in the embodiment is not particularly limited, and the type of the display device commonly used in the art may be, for example, a liquid crystal display, an OLED display, a mobile device such as a mobile phone, a wearable device such as a watch, etc., and those skilled in the art may select the touch display device accordingly according to the specific application of the display device, which is not described herein again.

It should be noted that, the touch display device includes other necessary components and components besides the display module and the touch module, taking the liquid crystal display device as an example, specifically, such as a housing, a main circuit board, a power line, etc., the touch display device can be correspondingly supplemented according to the specific use requirement of the display device, which is not described herein again.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.