Touch panel, display device and preparation method of touch panel

Abstract

The invention discloses a touch panel, a display device and a preparation method of the touch panel, and the touch panel comprises a substrate which comprises a first surface and a second surface which are oppositely arranged, and at least part of the substrate is provided with a through hole; the first touch layer is located on one side of the first surface of the substrate; the second touch layer is located on one side of the second surface of the substrate, and the first touch layer and the second touch layer are electrically connected through the through hole. By means of the design, the touch panel has the double-face touch effect, and therefore the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of touch technology, and in particular to a touch panel, a display device, and a method for manufacturing the touch panel. Background Art

[0002] Touch is currently the main medium for human-computer interaction. With the development of touch technology and people's demand for higher product effects, touch technology has flourished. However, as the market demand for touch continues to increase, how to further enhance the user experience of touch functions has become an urgent problem to be solved. Summary of the invention

[0003] The present application provides a touch panel, a display device and a method for manufacturing a touch panel, which can achieve a double-sided touch effect, thereby improving user experience.

[0004] The present application provides a touch panel according to a first aspect, comprising: a substrate, comprising a first surface and a second surface arranged opposite to each other, wherein at least part of the substrate is provided with through holes; a first touch layer, located on one side of the first surface of the substrate; and a second touch layer, located on one side of the second surface of the substrate, wherein the first touch layer and the second touch layer are electrically connected through the through holes.

[0005] The first touch layer includes a first touch electrode, the second touch layer includes a second touch electrode, the first touch electrode and the second touch electrode both extend along a first direction, and the first touch electrode is electrically connected to the second touch electrode through the through hole.

[0006] The first touch layer further includes a third touch electrode, the second touch layer further includes a fourth touch electrode, the third touch electrode and the fourth touch electrode both extend along a second direction, the third touch electrode is electrically connected to the fourth touch electrode through another through hole, and the first direction intersects with the second direction.

[0007] The orthographic projection of the second touch control electrode on the substrate at least partially overlaps with the orthographic projection of the first touch control electrode on the substrate.

[0008] The orthographic projection of the second touch electrode on the substrate is located within the orthographic projection of the first touch electrode on the substrate.

[0009] The orthographic projection of the fourth touch electrode on the substrate at least partially overlaps with the orthographic projection of the third touch electrode on the substrate.

[0010] The orthographic projection of the fourth touch electrode on the substrate is located within the orthographic projection of the third touch electrode on the substrate.

[0011] The first direction is perpendicular to the second direction.

[0012] There is one through hole, and the first end of the first touch electrode is electrically connected to the first end of the second touch electrode through the through hole.

[0013] Wherein, the second end of the first touch electrode is used for being electrically connected to the touch chip.

[0014] Wherein, the touch panel comprises a display area and a frame area located outside the display area, and the through hole is located in the frame area.

[0015] The first touch electrode and the second touch electrode are electrically connected via a plurality of through holes arranged at intervals along the first direction.

[0016] Among them, the first touch layer also includes a third touch electrode, the second touch layer also includes a fourth touch electrode, the third touch electrode and the fourth touch electrode both extend along the second direction, the third touch electrode and the fourth touch electrode are electrically connected through a plurality of through holes arranged at intervals in the second direction, wherein the first direction intersects with the second direction.

[0017] The area where the orthographic projection of the first touch electrode on the substrate intersects with the orthographic projection of the third touch electrode on the substrate is a first overlapping area, and the orthographic projection of the through hole on the substrate does not overlap with the first overlapping area.

[0018] The area where the orthographic projection of the second touch electrode on the substrate intersects with the orthographic projection of the fourth touch electrode on the substrate is a second overlapping area, and the orthographic projection of the through hole on the substrate does not overlap with the second overlapping area.

[0019] The touch panel further includes: an array layer located between the substrate and the first touch layer, including a driving unit; and a display layer located between the array layer and the first touch layer, including a light emitting unit.

[0020] Preferably, an orthographic projection of the through hole on the substrate does not overlap with an orthographic projection of the light emitting unit on the substrate.

[0021] Preferably, an orthographic projection of the through hole on the substrate does not overlap with an orthographic projection of the driving unit on the substrate.

[0022] Preferably, the material of the substrate includes a transparent insulating material.

[0023] Preferably, the material of the first touch electrode, the second touch electrode, the third touch electrode and the fourth touch electrode comprises a transparent conductive material.

[0024] The through hole includes a first opening formed on the first surface and a second opening formed on the second surface, the first opening and the second opening are interconnected, part of the first touch layer is formed in the first opening, part of the second touch layer is formed in the second opening, and the first touch layer formed in the first opening is electrically connected to the second touch layer formed in the second opening.

[0025] Preferably, the touch panel further includes a conductive layer located at least between the first touch layer formed in the first opening and the second touch layer formed in the second opening.

[0026] Preferably, the material of the conductive layer is the same as that of the first touch layer, or the material of the conductive layer is the same as that of the second touch layer.

[0027] Preferably, a portion of the conductive layer is formed in the first opening, and another portion of the conductive layer is formed on a side of the first surface of the substrate.

[0028] Preferably, the width of the first opening decreases in a direction approaching the second surface.

[0029] Preferably, the angle between the side wall of the first opening and the first surface is greater than or equal to 30° and less than or equal to 60°.

[0030] Preferably, the width of the second opening decreases in a direction approaching the first surface.

[0031] Preferably, the angle between the side wall of the second opening and the first surface is greater than or equal to 30° and less than or equal to 60°.

[0032] Preferably, the depth of the first opening is equal to the depth of the second opening.

[0033] Preferably, the cross-section of the through hole is rectangular or hourglass-shaped.

[0034] A second aspect of the present application provides a display device, which includes a touch control chip and a touch control panel as described in any one of the above embodiments.

[0035] A third aspect of the present application provides a method for preparing a touch panel, the method comprising: forming a first touch layer and a second touch layer on opposite sides of a substrate, respectively, wherein the first touch layer and the second touch layer are electrically connected via a through hole provided in the substrate.

[0036] The step of forming the first touch layer and the second touch layer on opposite sides of the substrate includes: forming a first opening as a blind hole on the first surface of the substrate; forming the first touch layer on one side of the first surface of the substrate, with part of the first touch layer formed in the first opening; forming a second opening connected to the first opening on one side of the second surface of the substrate to expose the first touch layer formed in the first opening; forming a second touch layer on one side of the second surface of the substrate, with part of the second touch layer formed in the second opening to be electrically connected to the first touch layer formed in the first opening.

[0037] Before forming the first touch layer on the first surface of the substrate, the method further includes: forming a conductive layer at least on the bottom wall of the first opening, wherein after the second opening is subsequently formed, the conductive layer is exposed in the second opening.

[0038] Before the step of forming the first touch layer and the second touch layer on opposite sides of the substrate, the steps include: forming an array layer on the first surface of the substrate; and forming a display layer on the side of the array layer away from the substrate. And the step of forming the first opening as a blind hole on the first surface of the substrate includes: patterning the display layer, the array layer and the substrate to form the first opening as a blind hole on the first surface of the substrate.

[0039] Different from the prior art, the beneficial effect of the present application is: the present application electrically connects the first touch layer and the second touch layer on both sides of the substrate through a through hole, so that no matter whether the finger is performing a touch operation on the front or back of the touch panel, touch signals will be generated on the first touch layer and the second touch layer. Therefore, as long as one of the first touch layer and the second touch layer is directly electrically connected to the touch chip, the touch panel can have a double-sided touch function. Therefore, the present application can not only realize double-sided touch, but also reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0041] Figure 1 is a schematic structural diagram of a first embodiment of a touch panel of the present application;

[0042] Figure 2 yes Figure 1 A schematic diagram of the top view structure of the touch panel in the first application scenario;

[0043] Figure 3 yes Figure 2 A schematic cross-sectional structure diagram of an implementation scheme of the M-M' region of the middle touch panel;

[0044] Figure 4 yes Figure 2 A schematic cross-sectional structure diagram of an implementation method of the N-N' region of the touch panel;

[0045] Figure 5 yes Figure 1 A schematic diagram of the top view structure of the middle touch panel in the second application scenario;

[0046] Figure 6 yes Figure 5 A schematic cross-sectional structure diagram of an implementation scheme of the M-M' region of the middle touch panel;

[0047] Figure 7 yes Figure 5 A schematic cross-sectional structure diagram of an implementation method of the N-N' region of the touch panel;

[0048] Figure 8 yes Figure 1 A schematic diagram of the top view structure of the touch panel in the third application scenario;

[0049] Fig. 9 yes Figure 8 A schematic cross-sectional structure diagram of an implementation scheme of the M-M' region of the middle touch panel;

[0050] Fig.10 yes Figure 8 A schematic cross-sectional structure diagram of an implementation method of the N-N' region of the touch panel;

[0051] Fig.11 is a schematic structural diagram of a second embodiment of a touch panel of the present application;

[0052] Fig.12 yes Fig.11 A schematic diagram of the top view structure of the touch panel in an application scenario;

[0053] Fig.13 yes Figure 1 A schematic structural diagram of a first implementation mode of the middle region K;

[0054] Fig.14 yes Figure 1 A schematic structural diagram of a second embodiment of the middle region K;

[0055] Fig.15 yes Figure 1 A schematic structural diagram of a third implementation mode of the middle region K;

[0056] Fig.16 is a schematic diagram of an embodiment of a display device of the present application;

[0057] Fig.17 It is a schematic diagram of the process of preparing the touch panel of the present application;

[0058] Fig.18 yes Fig.17 A schematic flow chart of an implementation method of step S100;

[0059] Fig.19 yes Figure 1 A schematic diagram of an embodiment of a touch panel manufacturing process in a middle area K;

[0060] Fig. 20 yes Fig.18 A schematic diagram of an implementation of a touch panel preparation process before step S110;

[0061] Fig.21 yes Fig.17 A schematic flow chart of an embodiment of the preparation method before step S100;

[0062] Fig. 22 yes Fig.21 A schematic diagram of an implementation of a preparation process corresponding to a method for preparing a touch panel;

[0063] Fig.23 It is a schematic diagram of an implementation of the preparation process corresponding to step S30. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] See also Figure 1In a first aspect, the present application provides a touch panel 10, which includes a substrate 100, a first touch layer 200, and a second touch layer 300. The substrate 100 includes a first surface A and a second surface B that are arranged opposite to each other, and a through hole H is provided at least partially on the substrate 100; the first touch layer 200 is located on the first surface A side of the substrate 100; the second touch layer 300 is located on the second surface B side of the substrate 100, wherein the first touch layer 200 is electrically connected to the second touch layer 300 through the through hole H.

[0066] Specifically, a first touch layer 200 is provided on the first surface A of the substrate 100. When a finger performs a touch operation near the first surface A, the position of the first touch layer 200 near the touch of the finger will be affected by the charge on the finger, so that the capacitance of the position changes, thereby obtaining a touch signal at the position. When a touch operation is performed near the first surface B, the position of the second touch layer 300 near the touch of the finger will be affected by the charge on the finger, so that the capacitance of the position changes, thereby obtaining a touch signal at the position. It can be seen that there is no essential difference between the first touch layer 200 and the second touch layer 300 in terms of touch function, and both are used for touch of corresponding surfaces.

[0067] Further, the first touch layer 200 and the second touch layer 300 are arranged on two opposite surfaces of the substrate 100. It can be understood that the touch panel 10 can realize touch control on both sides through such a design. And the first touch layer 200 and the second touch layer 300 are electrically connected through a through hole H, and the through hole H is provided with a conductive material. The conductive material can be the same as one of the first touch layer 200 and the second touch layer 300, or it can be other conductive materials. The substrate 100 includes a rigid substrate or a flexible substrate. The present application uses a through hole to electrically connect the first touch layer 200 and the second touch layer 300. When only the first touch layer 200 is directly electrically connected to the touch chip, the touch chip can transmit a signal to the second touch layer 300 through the first touch layer 200, and the touch signal generated by the second touch layer 300 can also be transmitted to the touch chip through the first touch layer 200. Therefore, the present application can realize the double-sided touch function of the touch panel 10 under the premise of using only one touch chip, which can reduce costs.

[0068] Of course, the first touch layer 200 can also be electrically connected to the first touch chip, and the second touch layer 300 can be electrically connected to the second touch chip. In this case, the first touch chip and the second touch chip can work in turn, and the touch panel 10 can have a double-sided touch function, or even if one of the first touch chip and the second touch chip is damaged, it will not affect the normal touch function of the touch panel.

[0069] In one embodiment, see Figure 2 , Figure 3 and Figure 4 The first touch layer 200 includes a first touch electrode 210 , and the second touch layer 300 includes a second touch electrode 310 . Both the first touch electrode 210 and the second touch electrode 310 extend along the first direction X, wherein the first touch electrode 210 is electrically connected to the second touch electrode 310 through a through hole H.

[0070] Specifically, the first touch electrode 210 and the second touch electrode 310 both extend along the first direction X, that is, the first touch electrode 210 and the second touch electrode 310 are of the same type, both are TX touch electrodes, or both are RX touch electrodes, and the first touch electrode 210 and the second touch electrode 310 are electrically connected through the through hole H. When at least one of the first touch electrode 210 and the second touch electrode 310 senses the touch operation of the finger, it is equivalent to that both the first touch electrode 210 and the second touch electrode 310 sense the touch operation of the finger.

[0071] In one embodiment, continue to refer to Figure 2 , Figure 3 and Figure 4 The first touch layer 200 further includes a third touch electrode 220, and the second touch layer 300 further includes a fourth touch electrode 320. The third touch electrode 220 and the fourth touch electrode 320 both extend along the second direction Y, wherein the third touch electrode 220 is electrically connected to the fourth touch electrode 320 through another through hole H, and the first direction X and the second direction Y intersect.

[0072] Specifically, the third touch electrode 220 and the fourth touch electrode 320 both extend along the second direction Y, that is, the third touch electrode 220 and the fourth touch electrode 320 are of the same type, both are TX touch electrodes, or both are RX touch electrodes, and the third touch electrode 220 and the fourth touch electrode 320 are electrically connected through another through hole H. When at least one of the third touch electrode 220 and the fourth touch electrode 320 senses the touch operation of the finger, it is equivalent to that both the third touch electrode 220 and the fourth touch electrode 320 sense the touch operation of the finger. In addition, it can be seen from the above content that, since the first direction X and the second direction Y intersect, the area sensed by the first touch electrode 210 and the second touch electrode 310 is different from the area sensed by the third touch electrode 220 and the fourth touch electrode 320, and the above two areas intersect, and the intersecting area is a common sensing area, and the common sensing area can be used to determine the specific position of the touch. Furthermore, since the first touch electrode 210 and the second touch electrode 310 constitute a capacitor structure, there is no direct electrical connection relationship between the first touch electrode 210 and the second touch electrode 310, and the third touch electrode 220 and the fourth touch electrode 320 constitute a capacitor structure, there is no direct electrical connection relationship between the third touch electrode 220 and the fourth touch electrode 320, therefore, the through hole H electrically connected to the first touch electrode 210 and the second touch electrode 310 and the through hole H electrically connected to the third touch electrode 220 and the fourth touch electrode 320 are different through holes.

[0073] Furthermore, in order to ensure the touch effect between the first touch electrode 210 and the third touch electrode 220, the first touch layer 200 also includes a first insulating layer 230, which is arranged between the first touch electrode 210 and the third touch electrode 220. In order to ensure the touch effect between the second touch electrode 310 and the fourth touch electrode 320, the second touch layer 300 also includes a second insulating layer 330, which is arranged between the second touch electrode 310 and the fourth touch electrode 320.

[0074] In one embodiment, continue to refer to Figure 2 , Figure 3 and Figure 4 The number of the first touch electrodes 210, the second touch electrodes 310, the third touch electrodes 220 and the fourth touch electrodes 320 are all multiple, the multiple first touch electrodes 210 are arranged at intervals in the second direction Y, the multiple second touch electrodes 310 are arranged at intervals in the second direction Y, the multiple third touch electrodes 220 are arranged at intervals in the first direction X, and the multiple fourth touch electrodes 320 are arranged at intervals in the first direction X.

[0075] In one embodiment, see Figure 3, the orthographic projection of the second touch electrode 310 on the substrate 100 at least partially overlaps with the orthographic projection of the first touch electrode 210 on the substrate 100 .

[0076] Specifically, the design in which the orthographic projection of the second touch electrode 310 on the substrate 100 at least partially overlaps with the orthographic projection of the first touch electrode 210 on the substrate 100 can, on the one hand, reduce the misalignment of the orthographic projections of the first touch electrode 210 and the second touch electrode 310 on the substrate 100 as much as possible. The higher the overlap ratio, the more sensitive the touch accuracy. On the other hand, the through hole H can be set in the area where the orthographic projections of the two on the substrate 100 overlap, thereby simplifying the structure of the through hole H and facilitating preparation.

[0077] Preferably, see Figure 3 , the orthographic projection of the second touch electrode 310 on the substrate 100 is located within the orthographic projection of the first touch electrode 210 on the substrate 100. This further improves the overlap between the orthographic projection of the second touch electrode 310 on the substrate 100 and the orthographic projection of the first touch electrode 210 on the substrate 100, thereby further improving the accuracy of double-sided touch.

[0078] In one embodiment, see Figure 4 , the orthographic projection of the fourth touch electrode 320 on the substrate 100 at least partially overlaps with the orthographic projection of the third touch electrode 220 on the substrate 100 .

[0079] Specifically, the design in which the orthographic projection of the fourth touch electrode 320 on the substrate 100 at least partially overlaps with the orthographic projection of the third touch electrode 220 on the substrate 100 can, on the one hand, reduce the misalignment of the orthographic projections of the third touch electrode 220 and the fourth touch electrode 320 on the substrate 100 as much as possible. The higher the overlap ratio, the more sensitive the touch accuracy. On the other hand, the through hole H can be set in the area where the orthographic projections of the two on the substrate 100 overlap, thereby simplifying the structure of the through hole H and facilitating preparation.

[0080] Preferably, see Figure 4 , the orthographic projection of the fourth touch electrode 320 on the substrate 100 is located within the orthographic projection of the third touch electrode 220 on the substrate 100. This further improves the overlap between the orthographic projection of the fourth touch electrode 320 on the substrate 100 and the orthographic projection of the third touch electrode 220 on the substrate 100, thereby further improving the accuracy of double-sided touch.

[0081] In one application scenario, see Figure 2 , the first direction X is perpendicular to the second direction Y.

[0082] Of course, in some other application scenarios, the angle between the first direction X and the second direction Y may not be a right angle.

[0083] Of course, it should be noted that the relative positions of the first touch electrode 210, the second touch electrode 310, the third touch electrode 220 and the fourth touch electrode 320 with respect to the substrate 100 are not limited to the above-mentioned embodiments, and the film layer setting method and specific setting structure of the above-mentioned touch electrodes can also be other structures.

[0084] In one embodiment, see Figure 5 and Figure 6 , the number of the through hole H is one, and the first end 2101 of the first touch electrode 210 is electrically connected to the first end 3101 of the second touch electrode 310 through the through hole H.

[0085] Specifically, the through hole H electrically connects the first end 2101 of the first touch electrode 210 with the first end 3101 of the second touch electrode 310, which is equivalent to connecting the first touch electrode 210 and the second touch electrode 310 in series, so that no matter whether the touch operation of the finger is sensed from the first touch electrode 210 or the second touch electrode 310, the sensing signal can be transmitted to the other touch electrode through the through hole H. Therefore, each first touch electrode 210 only needs to be electrically connected at its first end 2101 with the first end 3101 of the corresponding second touch electrode 310 through a through hole H. In this embodiment, only one through hole H needs to be set in the substrate 100, and the preparation of the through hole H is simpler.

[0086] Further reading Figure 5 and Figure 6 The second end 2102 of the first touch electrode 210 is used to be electrically connected to a touch chip (not shown). It can be seen that after the first end 2101 of the first touch electrode 210 is electrically connected to the first end 3101 of the second touch electrode 310 through the through hole H, it is electrically connected to the touch chip through the second end 2102, and the touch function is realized by receiving signals from the touch chip and sending signals to the touch chip.

[0087] For further information, see Figure 5 The touch panel 10 includes a display area AA and a frame area BA located outside the display area AA, and the through hole H is located in the frame area BA. The through hole H is placed in the frame area BA outside the display area AA, so that the influence of the through hole H on the display effect can be reduced.

[0088] In yet another embodiment, see Figure 5 and Figure 7The first end 2201 of the third touch electrode 220 is electrically connected to the first end 3201 of the fourth touch electrode 320 through a through hole H, that is, the third touch electrode 220 and the fourth touch electrode 320 are connected in series through the through hole H. The principle is similar to that of the first touch electrode 210 and the second touch electrode 310, and the second end 2202 of the third touch electrode 220 can also be used to electrically connect to the touch chip. The through hole H can also be set outside the display area, and the specific principle will not be repeated here.

[0089] In one embodiment, see Figure 8 and Fig. 9 The first touch electrode 210 is electrically connected to the second touch electrode 310 through a plurality of through holes H arranged at intervals along the first direction X.

[0090] Specifically, the first touch electrode 210 and the second touch electrode 310 are electrically connected through a plurality of through holes H arranged at intervals along the first direction X to form a parallel-like electrical connection structure. When transmitting a touch signal, the transmission path of the touch signal is reduced, the touch response speed is improved, and thus the touch sensitivity is improved.

[0091] For further information, see Figure 8 and Fig.10 The first touch layer 200 further includes a third touch electrode 220, and the second touch layer 300 further includes a fourth touch electrode 320. The third touch electrode 220 is electrically connected to the fourth touch electrode 320 through a plurality of through holes H arranged at intervals in the second direction Y. The third touch electrode 220 and the fourth touch electrode 320 both extend along the second direction Y, wherein the first direction X and the second direction Y intersect.

[0092] Specifically, the through hole H is different from the through hole H electrically connecting the first touch electrode 210 and the second touch electrode 310. The through holes H are arranged at intervals in the second direction Y. The third touch electrode 220 and the fourth touch electrode 320 are electrically connected through multiple through holes H to form a parallel-like electrical connection structure. When transmitting touch signals, the transmission path of the touch signals is reduced, the touch response speed is improved, and thus the touch sensitivity is improved.

[0093] For further information, see Figure 8 and Fig. 9 The area where the orthographic projection of the first touch electrode 210 on the substrate 100 intersects with the orthographic projection of the third touch electrode 220 on the substrate 100 is the first overlapping area, and the orthographic projection of the through hole H on the substrate 100 does not overlap with the first overlapping area.

[0094] Specifically, the first overlapping area is the overlapping area of ​​the orthographic projection of the first touch electrode 210 and the third touch electrode 220. Usually, in order to ensure better touch accuracy, the sizes of the first touch electrode 210 and the third touch electrode 220 corresponding to the first overlapping area are designed to be smaller. Therefore, the through hole H is designed here, and the size of the through hole H will be limited. At the same time, the first overlapping area is the overlapping area of ​​the orthographic projection of the first touch electrode 210 and the third touch electrode 220. Setting the through hole H in this area may cause interference problems, affecting the touch function.

[0095] For further information, see Figure 8 and Fig.10 The area where the orthographic projection of the second touch electrode 310 on the substrate 100 intersects with the orthographic projection of the fourth touch electrode 320 on the substrate 100 is the second overlapping area, and the orthographic projection of the through hole H on the substrate 100 does not overlap with the second overlapping area.

[0096] Specifically, similar to the effect of the first overlapping area mentioned above, the second overlapping area is the overlapping area of ​​the orthographic projection of the second touch electrode 310 and the fourth touch electrode 320. Usually, in order to ensure better touch accuracy, the sizes of the second touch electrode 310 and the fourth touch electrode 320 corresponding to the second overlapping area are designed to be smaller. Therefore, the through hole H is designed here, and the size of the through hole H will be limited. At the same time, the second overlapping area is the overlapping area of ​​the orthographic projection of the second touch electrode 310 and the fourth touch electrode 320. Setting the through hole H in this area may cause interference problems, affecting the touch function.

[0097] In some other embodiments, the first end of the first touch electrode 210 is electrically connected to the first end of the second touch electrode 310 via the through hole H, and the third touch electrode 220 is electrically connected to the fourth touch electrode 320 via a plurality of through holes H.

[0098] In one embodiment, see Fig.11 and Fig.12 The touch panel 10 further includes an array layer 400 and a display layer 500. The array layer 400 is located between the substrate 100 and the first touch layer 200 and includes a driving unit 410. The display layer 500 is located between the array layer 400 and the first touch layer 200 and includes a light-emitting unit 510. The light-emitting unit 510 in the display layer 500 is used to emit light, and the driving unit 410 in the array layer 400 is electrically connected to the light-emitting unit 510 to drive the light-emitting unit 510 to emit light.

[0099] For further information, see Fig.12 , the orthographic projection of the through hole H on the substrate 100 does not overlap with the orthographic projection of the light emitting unit 510 on the substrate 100. Thus, the influence of the through hole H on the light emitting unit 510 is reduced, and the electrical connection with the light emitting unit 510 can be avoided.

[0100] Further reading Fig.12 , the orthographic projection of the through hole H on the substrate 100 does not overlap with the orthographic projection of the driving unit 410 on the substrate 100. This reduces the influence of the through hole H on the circuit in the driving unit 410 and avoids electrical connection with the driving unit 410.

[0101] Furthermore, the material of the substrate 100 includes a transparent insulating material. The material of the substrate 100 includes a transparent insulating material such as glass and polyimide. On the one hand, the substrate 100 is transparent, so that the light emitted by the light-emitting unit 510 can be emitted not only from the direction of the first surface A side of the substrate 100, but also from the direction of the second surface B side of the substrate 100, thereby achieving a transparent display effect. On the other hand, the insulating material can prevent the conductive material in the through hole H from being electrically connected to the non-touch layer.

[0102] For further information, see Fig.12 The materials of the first touch electrode 210, the second touch electrode 310, the third touch electrode (not shown) and the fourth touch electrode (not shown) include transparent conductive materials. The transparent conductive materials include indium tin oxide, etc. The transparent conductive materials can further increase the transmittance of light, thereby improving the transparent display effect.

[0103] In one embodiment, see Fig.13 The through hole H includes a first opening H1 formed on the first surface A and a second opening H2 formed on the second surface B, the first opening H1 and the second opening H2 are interconnected, wherein a portion of the first touch layer 200 is formed in the first opening H1, a portion of the second touch layer 300 is formed in the second opening H2, and the first touch layer 200 formed in the first opening H1 is electrically connected to the second touch layer 300 formed in the second opening H2.

[0104] Specifically, the first opening H1 is formed on the first surface A, and the second opening H2 is formed on the second surface B. The first opening H1 and the second opening H2 may be formed in two steps or in the same step. The first opening H1 and the second opening H2 are connected to each other to form the through hole H. In addition to being formed on one side of the first surface A of the substrate 100, the first touch layer 200 is further formed to the first opening H1. In addition to being formed on one side of the second surface B of the substrate 100, the second touch layer 300 is further formed to the second opening H2. The first touch layer 200 and the second touch layer 300 are electrically connected in the region where the first opening H1 and the second opening H2 are connected.

[0105] For further information, see Fig.13, the width of the first opening H1 decreases in the direction close to the second surface B. The gentle slope can improve the adhesion effect of the first touch layer 200 in the first opening H1. Preferably, the angle between the side wall of the first opening H1 and the first surface A is greater than or equal to 30° and less than or equal to 60°. Specifically, the angle can be 30°, 45° or 60°, etc., and the present application does not limit the specific angle.

[0106] For further information, see Fig.13 , the width of the second opening H2 decreases in the direction close to the first surface A. The gentle slope can improve the adhesion effect of the second touch layer 300 in the second opening H2. Preferably, the angle between the side wall of the second opening H2 and the first surface A is greater than or equal to 30° and less than or equal to 60°. Specifically, the angle can be 30°, 45° or 60°, etc., and the present application does not limit the specific angle.

[0107] In one embodiment, see Fig.13 The depth of the first opening H1 is equal to the depth of the second opening H2, so as to ensure that the effects of the first touch layer 200 formed in the first opening H1 and the second touch layer 300 formed in the second opening H2 are the same.

[0108] In one embodiment, the cross-section of the through hole H is rectangular or hourglass-shaped, so as to ensure better electrical connection between the first touch layer 200 and the second touch layer 300 .

[0109] In one embodiment, see Fig.14 The touch panel 10 further includes a conductive layer 600 , which is at least located between the first touch layer 200 formed in the first opening H1 and the second touch layer 300 formed in the second opening H1 .

[0110] Specifically, the conductive layer 600 can electrically connect the first touch layer 200 and the second touch layer 300. In addition, the conductive layer 600 can also protect the first touch layer 200 or the second touch layer 300 during the preparation process. For example, when the first opening H1 and the second opening H2 are formed separately, the first opening H1 is first formed on the first surface A of the substrate 100, and then the conductive layer 600 is formed at least in the first opening H1, and then the first touch layer 200 is further formed, and then the second opening H2 is formed on the second surface B of the substrate 100. At this time, when forming the second opening H2, the substrate 100 must be dug through until it contacts the conductive layer 600. However, it is generally difficult to accurately control the depth of the second opening H2 in the process. By shielding the conductive layer 600, it is avoided that when digging the second opening H2, the first touch layer 200 is directly dug, thereby affecting the touch effect of the first touch layer 200. It can be seen that the conductive layer 600 has the function of protecting the first touch layer 200. Of course, if the second opening H2 is formed first, the second touch layer 300 is ultimately protected. The principle is similar and will not be described in detail.

[0111] Furthermore, the material of the conductive layer 600 is the same as that of the first touch layer 200, or the material of the conductive layer 600 is the same as that of the second touch layer 300. This is equivalent to protecting the first touch layer 200 or the second touch layer 300 by thickening the through hole H, and selecting the same material can also reduce contact resistance.

[0112] For further information, see Fig.15 , a portion of the conductive layer 600 is formed in the first opening H1, and another portion of the conductive layer 600 is formed on the first surface A side of the substrate 100. The advantage of such a design is that the conductive layer 600 does not need to be prepared on the first opening H1 alone, and the conductive layer 600 can be formed on the entire surface, thereby simplifying the preparation method of the conductive layer 600.

[0113] See also Fig.16 In a second aspect, the present application provides a display device 20 , which includes a touch control chip 30 and a touch panel 10 in any one of the above embodiments.

[0114] Specifically, the display device 20 includes a notebook, a desktop, a smart phone, a smart wearable device, and a vehicle-mounted display.

[0115] See also Figure 1 and Fig.17 In a third aspect, the present application provides a method for preparing a touch panel 10, the method comprising:

[0116] A first touch layer 200 and a second touch layer 300 are respectively formed on two opposite sides of the substrate 100 , wherein the first touch layer 200 and the second touch layer 300 are electrically connected via a through hole H provided in the substrate 100 .

[0117] Specifically, the preparation order of the first touch layer 200 and the second touch layer 300 is not limited. The first touch layer 200 can be prepared on the first surface A of the substrate 100 first, and then the second touch layer 300 can be prepared on the second surface B of the substrate 100. Of course, the second touch layer 300 can be prepared on the second surface B of the substrate 100 first, and then the first touch layer 200 can be prepared on the first surface A of the substrate 100. The first touch layer 200 and the second touch layer 300 can be prepared by a coating process, for example, a PVD (physical vapor deposition) process. The through hole H should be prepared at least before preparing at least one of the first touch layer 200 and the second touch layer 300. The through hole H can be prepared by photolithography technology or through silicon via technology.

[0118] For further information, see Figure 2 , Figure 3 and Figure 4 The first touch layer 200 includes a first touch electrode 210 and a third touch electrode 220, and the second touch layer 300 includes a second touch electrode 310 and a fourth touch electrode 320. When preparing any of the above electrodes, a touch electrode layer of the entire surface can be formed first, and then a photolithography technology is used to prepare a patterned touch electrode.

[0119] In one embodiment, see Fig.18 and Fig.19 The above step S100 includes:

[0120] S110 : forming a first opening H1 as a blind hole on the first surface A of the substrate 100 .

[0121] Specifically, a first opening H1 is formed on the first surface A of the substrate 100 by using photolithography technology or through silicon via technology. The first opening H1 cannot be opened through and needs to be a blind hole. The bottom wall of the blind hole is used to temporarily support a film layer in subsequent processes.

[0122] S120 : forming a first touch layer 200 on one side of the first surface A of the substrate 100 , wherein a portion of the first touch layer 200 is formed in the first opening H1 .

[0123] Specifically, the first touch layer 200 is prepared by a coating process. The first touch layer 200 is formed on one side of the first surface A and also on the hole wall and the bottom wall of the first opening H1.

[0124] S130 : forming a second opening H2 communicating with the first opening H1 on one side of the second surface B of the substrate 100 to expose the first touch layer 200 formed in the first opening H1 .

[0125] Specifically, a second opening H2 is formed on the second surface B of the substrate 100 by using photolithography technology or through silicon via technology. The second opening H2 needs to be connected to the first opening H1. When digging the second opening H2, damage to the first touch layer 200 in the first opening H1 should be avoided as much as possible. After the second opening H2 is dug, the first touch layer 200 should be exposed in the second opening H2.

[0126] S140 : forming a second touch layer 300 on the second surface B of the substrate 100 , wherein a portion of the second touch layer 300 is formed in the second opening H2 to be electrically connected to the first touch layer 200 formed in the first opening H1 .

[0127] Specifically, the second touch layer 300 is prepared by a coating process. The second touch layer 300 is formed on one side of the second surface B, and is also formed on the hole wall and bottom wall of the second opening H2, and is electrically connected to the first touch layer 200 in the first opening H1, thereby realizing electrical connection between the first touch layer 200 on the first surface A and the second touch layer 300 on the second surface B through the through hole H.

[0128] In one embodiment, in combination Fig.15 and Fig. 20 , before the above step S200, it also includes:

[0129] S111: forming a conductive layer 600 at least on the bottom wall of the first opening H1 , wherein, after the second opening H2 is subsequently formed, the conductive layer 600 is exposed in the second opening H2 .

[0130] Specifically, the conductive layer 600 can be formed only on the bottom wall of the first opening H1, or can be further extended to the side wall of the first opening H1 and the first surface A of the substrate 100. When the second opening H2 is subsequently excavated, the conductive layer 600 is used to protect the first touch layer 200 to prevent the first touch layer 200 from being damaged, thereby affecting the touch performance. When the preparation is finally completed, the conductive layer 600 in the through hole H is located between the first touch layer 200 and the second touch layer 300. The conductive layer 600 can transmit electrical signals and will not affect the touch performance.

[0131] In one embodiment, see Fig.21 and Fig. 22 , before the above step S100, comprising:

[0132] S10 : forming an array layer 400 on the first surface A of the substrate 100 .

[0133] Specifically, the array layer 400 includes a driving unit. In the process of preparing the driving unit, a patterned driving unit is obtained through processes such as coating, gluing, exposure, development, and etching.

[0134] S20 : ​​forming a display layer 500 on a side of the array layer 400 facing away from the substrate 100 .

[0135] Specifically, the display layer 500 includes a light-emitting unit, which is electrically connected to the driving unit. The display layer 500 may be prepared by using an evaporation process.

[0136] For further information, see Fig.23 The above step S110 includes:

[0137] S30 : patterning the display layer 500 , the array layer 400 and the substrate 100 to form a first opening H1 as a blind hole on the first surface A of the substrate 100 .

[0138] Specifically, a first opening H1 is formed on the first surface A of the substrate 100 using photolithography technology or through silicon via technology. The first opening H1 connects the display layer 500 and the array layer 400, but cannot connect the substrate 100. It needs to be a blind hole, and the bottom wall of the blind hole is used to temporarily support the film layer in subsequent processes.

[0139] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A touch panel, characterized in that: The touch panel comprises: A substrate, comprising a first surface and a second surface disposed opposite to each other, wherein at least a portion of the substrate is provided with through holes; A first touch layer, located on one side of the first surface of the substrate; The second touch layer is located on one side of the second surface of the substrate, wherein the first touch layer is electrically connected to the second touch layer through the through hole.

2. The touch panel according to claim 1, characterized in that: The first touch layer includes a first touch electrode, the second touch layer includes a second touch electrode, the first touch electrode and the second touch electrode both extend along a first direction, wherein the first touch electrode is electrically connected to the second touch electrode through the through hole; Preferably, the first touch layer further includes a third touch electrode, the second touch layer further includes a fourth touch electrode, the third touch electrode and the fourth touch electrode both extend along the second direction, wherein the third touch electrode is electrically connected to the fourth touch electrode through another through hole, and the first direction intersects with the second direction; Preferably, the orthographic projection of the second touch electrode on the substrate at least partially overlaps with the orthographic projection of the first touch electrode on the substrate; Preferably, the orthographic projection of the second touch electrode on the substrate is located within the orthographic projection of the first touch electrode on the substrate; Preferably, the orthographic projection of the fourth touch electrode on the substrate at least partially overlaps with the orthographic projection of the third touch electrode on the substrate; Preferably, the orthographic projection of the fourth touch electrode on the substrate is located within the orthographic projection of the third touch electrode on the substrate; Preferably, the first direction is perpendicular to the second direction.

3. The touch panel according to claim 2, characterized in that: The number of the through hole is one, and the first end of the first touch electrode is electrically connected to the first end of the second touch electrode through the through hole; Preferably, the second end of the first touch electrode is used to be electrically connected to the touch chip; Preferably, the touch panel comprises a display area and a frame area located outside the display area, and the through hole is located in the frame area.

4. The touch panel according to claim 2, characterized in that: The first touch electrode is electrically connected to the second touch electrode through a plurality of through holes arranged at intervals along the first direction; Preferably, the first touch layer further includes a third touch electrode, the second touch layer further includes a fourth touch electrode, the third touch electrode and the fourth touch electrode both extend along the second direction, the third touch electrode and the fourth touch electrode are electrically connected through a plurality of through holes arranged at intervals in the second direction, wherein the first direction intersects with the second direction; Preferably, an area where the orthographic projection of the first touch electrode on the substrate intersects with the orthographic projection of the third touch electrode on the substrate is a first overlapping area, and the orthographic projection of the through hole on the substrate does not overlap with the first overlapping area; Preferably, an area where the orthographic projection of the second touch electrode on the substrate intersects with the orthographic projection of the fourth touch electrode on the substrate is a second overlapping area, and the orthographic projection of the through hole on the substrate does not overlap with the second overlapping area.

5. The touch panel according to claim 2, characterized in that: Also includes: An array layer, located between the substrate and the first touch layer, comprising a driving unit; A display layer, located between the array layer and the first touch layer, comprising a light-emitting unit; Preferably, the orthographic projection of the through hole on the substrate does not overlap with the orthographic projection of the light emitting unit on the substrate; Preferably, the orthographic projection of the through hole on the substrate does not overlap with the orthographic projection of the driving unit on the substrate; Preferably, the material of the substrate includes a transparent insulating material; Preferably, the material of the first touch electrode, the second touch electrode, the third touch electrode and the fourth touch electrode comprises a transparent conductive material.

6. The touch panel according to claim 1, characterized in that: The through hole includes a first opening formed on the first surface and a second opening formed on the second surface, the first opening and the second opening are connected to each other, wherein a portion of the first touch layer is formed in the first opening, a portion of the second touch layer is formed in the second opening, and the first touch layer formed in the first opening is electrically connected to the second touch layer formed in the second opening; Preferably, the touch panel further comprises a conductive layer, at least located between the first touch layer formed in the first opening and the second touch layer formed in the second opening; Preferably, the material of the conductive layer is the same as that of the first touch layer, or the material of the conductive layer is the same as that of the second touch layer; Preferably, a portion of the conductive layer is formed in the first opening, and another portion of the conductive layer is formed on one side of the first surface of the substrate; Preferably, the width of the first opening decreases in a direction approaching the second surface; Preferably, the angle between the side wall of the first opening and the first surface is greater than or equal to 30° and less than or equal to 60°; Preferably, the width of the second opening decreases in a direction approaching the first surface; Preferably, the angle between the side wall of the second opening and the first surface is greater than or equal to 30° and less than or equal to 60°; Preferably, the depth of the first opening is equal to the depth of the second opening; Preferably, the cross-section of the through hole is rectangular or hourglass-shaped.

7. A display device, characterized in that: The invention comprises a touch control chip and a touch control panel as claimed in any one of claims 1 to 6.

8. A method for preparing a touch panel, characterized in that: The method comprises: A first touch layer and a second touch layer are respectively formed on two opposite sides of the substrate, wherein the first touch layer is electrically connected to the second touch layer via a through hole provided in the substrate.

9. The preparation method according to claim 8, characterized in that: The step of forming a first touch layer and a second touch layer on two opposite sides of the substrate comprises: a first opening formed as a blind hole on the first surface of the substrate; forming the first touch layer on one side of the first surface of the substrate, wherein a portion of the first touch layer is formed in the first opening; forming a second opening connected to the first opening on one side of the second surface of the substrate to expose the first touch layer formed in the first opening; forming a second touch layer on one side of the second surface of the substrate, wherein a portion of the second touch layer is formed in the second opening to be electrically connected to the first touch layer formed in the first opening; Preferably, before forming the first touch layer on the first surface of the substrate, the method further includes: A conductive layer is formed at least on a bottom wall of the first opening, wherein after the second opening is subsequently formed, the conductive layer is exposed in the second opening.

10. The preparation method according to claim 8, characterized in that: Before the step of forming the first touch layer and the second touch layer on two opposite sides of the substrate respectively, the method includes: forming an array layer on a first surface of the substrate; forming a display layer on a side of the array layer facing away from the substrate; And, the step of forming a first opening as a blind hole on the first surface of the substrate comprises: The display layer, the array layer, and the substrate are patterned to form the first opening as a blind hole on the first surface of the substrate.

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