TWI758838B - Touch structure, electronic device and method for driving touch structure - Google Patents

Abstract

One embodiment of the present disclosure provides a touch structure. The touch structure includes a substrate, a sensing layer, and a touch chip. The sensing layer includes a self-capacitive touch electrode and an environmental electrode. The touch chip is used to apply a same driving signal to the touch electrode and the environmental electrode through a first wiring and a second wiring, so that the touch electrode and the environmental electrode generate a first sensing signal and a second sensing signal, respectively. The touch chip determines a touch position according to the change of a difference between the first sensing signal and the second sensing signal. Vertical to a thickness direction of the substrate, the minimum distance between the environmental electrode and the touch electrode is less than 5 mm. A ratio of a projected area of the environmental electrode on the substrate to a projected area of the touch electrode on the substrate is less than 0.2. An electronic device and a method for driving the touch structure are also disclosed.

Description

Touch structure, electronic device and driving method of touch structure

The present invention relates to the technical field of touch control, and in particular, to a touch control structure, an electronic device using the touch control structure, and a driving method of the touch control structure.

In the self-capacitance touch structure, when a conductive object (such as a finger) approaches the touch electrode, the self-capacitance of the touch electrode is the result of the capacitance of the finger to the ground and the capacitance of the touch electrode to the ground in parallel. Of course, when the thickness of the cover plate located above the touch electrodes is thick (eg, greater than 10 mm), the capacitance change caused by the touch of the finger sensed by the touch electrodes is very small. In addition, the capacitance of the touch electrode to ground is often affected by the environment. For example, the touch trace will be disturbed by other signals on the nearby traces, and the touch chip will be disturbed by power noise and ground noise.

Therefore, in the conventional self-capacitance touch structure, on the one hand, the capacitance change caused by the touch of the finger sensed by the touch chip itself is very small, and on the other hand, the signal received by the touch chip has a large amount of Due to the noise, the signal-to-noise ratio of the signal finally received by the touch chip is very low, and it is difficult to stably judge the normal touch behavior.

An embodiment of the present invention provides a touch control structure, which includes: a substrate having a first surface; a sensing layer on the first surface, the sensing layer including a self-capacitance touch electrode and The touch electrodes are spaced apart and insulated from an ambient electrode; and a touch chip is electrically connected to the touch electrode and the ambient electrode through a first wiring and a second wiring respectively; The touch chip is used for applying the same driving signal to the touch electrode and the environment electrode through the first wire and the second wire respectively, so that the touch electrode and the environment electrode respectively generate a first sensing signal and a second sensing signal; the touch chip is further configured to receive the first sensing signal and the second sensing signal through the first wiring and the second wiring respectively, and according to The change of the difference between the first sensing signal and the second sensing signal determines the touch position; wherein, perpendicular to the thickness direction of the substrate, the minimum distance between the ambient electrode and the touch electrode is less than 5 mm; along the substrate The ratio of the projected area of the ambient electrode on the substrate to the projected area of the touch electrode on the substrate is less than 0.2; the second trace is adjacent to the first trace.

In the touch structure, since the area of the touch electrodes is much larger than the area of the ambient electrodes, the value of the first sensing signal is much larger than the value of the second sensing signal, and among the values of the second sensing signal, the finger sensing The proportion of the signal is relatively low, and the proportion of noise is relatively large. In addition, because the first trace is adjacent to the second trace, and the ambient electrode is close to the touch electrode, the first trace and the second trace have close ambient noise and the same power noise and ground noise, and the first trace and the second trace have similar ambient noise and the same power noise and ground noise. In the sensing signal and the second sensing signal, the environmental noise is equivalent. That is, the change of the difference between the first sensing signal and the second sensing signal can better reflect the conductive object (eg, a finger) touch behavior. The value of the first sensing signal minus the second sensing signal can retain more changes in self-capacitance caused by finger touch behavior, and improve the signal-to-noise ratio (the difference between the signal value and the noise value) of the signal finally detected by the touch chip. ratio), the touch structure has high sensitivity.

An embodiment of the present invention also provides an electronic device including a body and a touch structure mounted on the body, wherein the touch structure is the aforementioned touch structure.

The electronic device includes the above touch control structure, so it also has a high signal-to-noise ratio and high touch sensitivity.

An embodiment of the present invention also provides a driving method of the above-mentioned touch structure, which includes: the touch chip applies the same touch electrode and the environment electrode through the first wiring and the second wiring respectively. a driving signal, so that the touch electrode and the ambient electrode respectively generate a first sensing signal and a second sensing signal; and the touch chip receives the touch through the first wiring and the second wiring respectively The first sensing signal and the second sensing signal are used to determine the touch position according to the change of the difference between the first sensing signal and the second sensing signal.

In the driving method, most of the first sensing signals received by the touch chip are noise signals, and the change of the difference between the first sensing signal and the second sensing signal can better reflect a conductive object (for example, a finger ) touch behavior. The driving method improves the signal-to-noise ratio (the ratio of the signal value to the noise value) of the signal finally detected by the touch chip, and has high sensitivity.

10, 20: Touch structure

11: Substrate

111: First surface

112: Second Surface

12: Induction layer

121: Touch electrode

122: Environmental Electrode

13: Touch chip

141: The first line

142: Second trace

151: Insulating glue layer

152: Adhesive layer

16: Cover

161: main body

162: Press part

17: shading layer

171: Clear hole

18: Display module

19: circuit board

30: Ontology

100: Electronics

FIG. 1 is a schematic plan view of a touch control structure according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the touch control structure shown in FIG. 1 along the line A-A.

FIG. 3 is a schematic cross-sectional view of the touch control structure shown in FIG. 1 along the line B-B.

FIG. 4 is a schematic cross-sectional view of a touch control structure according to another embodiment of the present invention.

FIG. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

FIG. 6 is a flowchart of a driving method of a touch structure according to an embodiment of the present invention.

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. Of course, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

FIG. 1 is a schematic plan view of a touch control structure 10 according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the touch control structure 10 shown in FIG. 1 along the line A-A. Please refer to Fig. 1 and Fig. 2 in combination, touch structure 10 includes a substrate 11 , a sensing layer 12 , and a touch chip 13 . The substrate 11 has opposing first surfaces 111 and second surfaces 112 . The sensing layer 12 is located on the first surface 111 . The sensing layer 12 includes a self-capacitance touch electrode 121 and an ambient electrode 122 spaced from and insulated from the touch electrode 121 . The touch chip 13 is electrically connected to the touch electrodes 121 and the ambient electrodes 122 through the first traces 141 and the second traces 142 respectively.

The touch chip 13 is used for applying the same driving signal to the touch electrode 121 and the environment electrode 122 through the first wire 141 and the second wire 142 respectively, so that the touch electrode 121 and the environment The electrodes 122 respectively generate the first sensing signal and the second sensing signal. The touch chip 13 is further configured to receive the first sensing signal and the second sensing signal through the first trace 141 and the second trace 142 respectively, and to receive the first sensing signal and the second sensing signal according to the first sensing signal and the second sensing signal. The change of the difference value of the second sensing signal determines the touch position.

Perpendicular to the thickness direction of the substrate 11 , the minimum distance between the ambient electrode 122 and the touch electrode 121 is less than 5 mm. Along the thickness direction of the substrate 11 , the ratio of the projected area of the environmental electrodes 122 on the substrate 11 to the projected area of the touch electrodes 121 on the substrate 11 is less than 0.2. Each of the second traces 142 is adjacent to one of the first traces 141 .

In the touch control structure 10, since the area of the touch electrodes 121 is much larger than that of the environment electrodes 122, that is, the facing area between the touch electrodes 121 and the conductive objects (eg, fingers) is much larger than that between the environment electrodes 122 and the conductive objects ( For example, the area facing each other between fingers). According to the capacitance calculation formula, C=ε A/d (C is the capacitance, ε is a constant, A is the facing area between the two conductive objects, d is the distance between the two conductive objects), the first sensing signal (such as , the value of the capacitance C1) is much larger than the value of the second sensing signal (eg, the capacitance C2), and due to the small area of the environmental electrode 122, the environmental electrode 122 and the conductive object The area facing each other (eg, fingers) is also smaller, so that in the value of the second sensing signal (eg, capacitor C2 ), the sensing signal of the finger accounts for a lower proportion, and the noise accounts for a larger proportion .

In addition, since the first traces 141 are adjacent to the second traces 142 and the ambient electrodes 122 are adjacent to the touch electrodes 121, the first traces 141 and the second traces 142 have close ambient noise and the same power noise and ground. noise. That is, in the first sensing signal and the second sensing signal, the environmental noise is equivalent. The change of the difference between the first sensing signal and the second sensing signal can better reflect the touch behavior of a conductive object (eg, a finger). When a conductive object (eg, a finger) touches a touch electrode 121 corresponding to the touch structure 10 , the self-capacitance sensing signals of the touch electrode 121 in this area and the environment electrode 122 adjacent thereto are different. Among them, since the area of the environmental electrode 122 is small, the change of the self-capacitance caused by the touch behavior of the finger is also small, so that the second sensing signal is mostly noise generated by environmental noise. However, due to the large area of the touch electrodes 121 , the self-capacitance of the touch electrodes 121 changes greatly due to the touch behavior of the finger. And since the area of the touch electrode 121 is much larger than the area of the environment electrode 122 (more than 5 times), the change of the self-capacitance of the touch electrode 121 due to the touch operation of the finger is also much larger than that of the environment electrode 122 due to the touch operation of the finger. The resulting self-capacitance changes, so that the self-capacitance change of the ambient electrode 122 due to the touch operation of the finger can be ignored.

In addition, since the ambient electrodes 122 and the touch electrodes 121 are in close proximity, and the first traces 141 and the second traces 142 are in close proximity, the noises contained in the first sensing signal and the second sensing signal are substantially equal. Therefore, the value of the first sensing signal minus the second sensing signal can retain more changes in the self-capacitance caused by the finger touch behavior, which improves the signal-to-noise ratio (the ratio of the signal value to the noise value) detected by the touch chip 13 . ), the touch structure 10 has high sensitivity.

In one embodiment, the numbers of the touch electrodes 121 and the ambient electrodes 122 are plural. As shown in FIG. 1 , the touch electrodes 121 and the environment electrodes 122 are in one-to-one correspondence. The first trace 141 and the second trace Lines 142 are also in a one-to-one correspondence. Each touch electrode 121 is electrically connected to the touch chip 13 through a first trace 141 . Each of the environmental electrodes 122 is electrically connected to the touch chip 13 through a second trace 142 . The first wiring 141 and the second wiring 142 extend in the same direction, and are substantially equidistant and parallel therebetween.

In one embodiment, the vertical distance between the second trace 142 and the first trace 141 is less than 10 mm. The length difference between the second wiring 142 and a corresponding first wiring 141 is less than 10 mm. Therefore, by disposing an ambient electrode 122 around each touch electrode 121 and disposing a second trace 142 around the first trace 141 connected to the touch electrode 121 , the second trace is ensured. The lengths of 142 and the first traces 141 are equal to or slightly different from each other, so that the second sensing signal of the environmental electrodes 122 detected on the touch chip 13 is basically the environmental noise of the corresponding touch electrodes 121 .

In FIG. 1 , four pairs of touch electrodes 121 and ambient electrodes 122 are shown. It can be understood that the number of pairs of touch electrodes 121 and ambient electrodes 122 may be 1, 2, 3 or more. In addition, in FIG. 1 , the touch electrodes 121 are circular, and the ambient electrodes 122 are rectangular. In other embodiments, the shapes of the touch electrodes 121 and the ambient electrodes 122 may be the same or different, and may also be other shapes, such as diamonds, triangles, and the like.

In one embodiment, although the shapes of the touch electrodes 121 and the ambient electrodes 122 are not limited, the greater the difference between the areas of the two, the more the difference between the first sensing signal and the second sensing signal can reflect the self-response caused by the touch behavior. change in capacitance value.

In FIG. 1 , the touch chip 13 is located on a circuit board 19 , and the circuit board 19 is overlapped on the substrate 11 . The circuit board 19 may be a flexible circuit board.

In one embodiment, the touch chip 13 is provided with a driving circuit and a detection circuit. The driving circuit can apply the same driving signal (eg, driving voltage) to the touch electrodes 121 and the environmental electrodes 122 one by one, and receive the first sense feedback from each of the touch electrodes 121 and the environmental electrodes 122 under the action of the driving signal. A sensing signal (eg, capacitance value) and a second sensing signal (eg, capacitance value). when the user's When a finger approaches or touches the touch structure 10, the self-capacitance value at the touch electrode 121 corresponding to the touch position changes, and the change can be reflected by the difference between the first sensing signal and the second sensing signal. The detection circuit processes the first sensing signal (eg, capacitance value) and the second sensing signal (eg, capacitance value) to obtain the difference between the two, so as to remove most of the ambient noise, and then determine the touch position.

In one embodiment, the touch electrodes 121 and the ambient electrodes 122 may be formed by patterning the same conductive material layer. The materials of the touch electrodes 121 and the environmental electrodes 122 may be conductive materials such as indium tin oxide, metal mesh, nano-silver, graphene, copper or aluminum, and other metal elements, metal alloys, and transparent conductive polymers.

As shown in FIG. 2 , the touch control structure 10 further includes a cover plate 16 . The cover plate 16 is located on the side of the sensing layer 12 away from the substrate 11 . The cover plate 16 includes a main body portion 161 and a pressing portion 162 protruding from the main body portion 161 in a direction away from the sensing layer 12 . Each of the pressing portions 162 is aligned with one of the touch electrodes 121 . That is, the pressing portions 162 and the touch electrodes 121 are in one-to-one correspondence.

As shown in FIG. 1 , the main body portion 161 has a substantially rectangular flat plate shape. Each pressing portion 162 is substantially circular. Along the thickness direction of the substrate 11 , the projection of each pressing portion 162 falls within the projection range of a corresponding touch electrode 121 , and the projection of the pressing portion 162 is different from the projection of any one of the environmental electrodes 122 . overlapping.

As shown in FIG. 3 , the distance from the ambient electrode 122 to the upper surface of the pressing portion 162 (ie, the surface of the pressing portion 162 away from the sensing layer 12 , that is, the touch surface) is greater than the distance from the touch electrode 121 to the upper surface of the pressing portion 162 . Therefore, when a conductive object (eg, a finger) touches the pressing portion 162 , the distance between the finger and the touch electrodes 121 is smaller than the distance between the finger and the ambient electrodes 122 around the touch electrodes 121 . According to the capacitance calculation formula, C=ε A/d (C is the capacitance, ε is a constant, A is the facing area between the two conductive objects, d is the distance between the two conductive objects), the first sensing signal ( e.g. capacitor C1) The value of is greater than the value of the second sensing signal (eg, capacitor C2), so that in the value of the second sensing signal (eg, capacitor C2), the proportion of the finger sensing signal is compared with the first sensing signal The proportion of the sensing signal of the finger in the signal is negligible. Therefore, the value of the first sensing signal minus the second sensing signal can retain more changes in the self-capacitance caused by the finger touch behavior, and improve the signal-to-noise ratio (the ratio of the signal value to the noise value) detected by the touch chip 13 . ), the touch structure 10 has high sensitivity.

In one embodiment, the cover plate 16 is transparent, and the touch control structure 10 further includes a light shielding layer 17 .

As shown in FIG. 2 and FIG. 3 , the light shielding layer 17 is located on the surface of the cover plate 16 close to the sensing layer 12 , and the light shielding layer 17 defines a light through hole 171 corresponding to the pressing portion 162 . The light-passing hole 171 is substantially circular, and the size of the light-passing hole 171 is equivalent to that of the pressing portion 162 . The material of the cover plate 16 is, for example, transparent glass or transparent plastic.

In one embodiment, the light-shielding layer 17 completely covers the area of the cover plate 16 except for the light-transmitting hole 171 , so as to block the light of the part other than the light-transmitting hole 171 , and further protect the internal circuits of the touch structure 10 (eg, the environment). The electrodes 122, the first traces 141 and the second traces 142) have a shielding effect. The material of the light shielding layer 17 may be light shielding ink.

As shown in FIG. 2 and FIG. 3 , the touch control structure 10 further includes an insulating adhesive layer 151 . The insulating adhesive layer 151 is located between the cover plate 16 and the substrate 11 to bond the two. The insulating adhesive layer 151 fills the gaps between the touch electrodes 121 , the ambient electrodes 122 , the first traces 141 and the second traces 142 , so that the touch electrodes 121 , the ambient electrodes 122 and the first traces on the substrate 11 The insulating layer 151 is used to achieve insulation between the line 141 and the second wiring 142 . In one embodiment, the insulating adhesive layer 151 may be transparent optical adhesive.

As shown in FIG. 2 and FIG. 3 , the touch control structure 10 further includes a display module 18 . The display module 18 is located on the side of the substrate 11 away from the sensing layer 12 and is bonded to the second surface 112 of the substrate 11 through the adhesive layer 152 .

In one embodiment, the adhesive layer 152 is a transparent optical adhesive, and the substrate 11 and the sensing layer 12 are transparent, so that the image displayed by the display module 18 can be displayed at the pressing portion 162 .

In one embodiment, the substrate 11 is transparent, and is made of polycarbonate, polymethyl methacrylate, polyethylene terephthalate, or transparent polyimide. The material of the sensing layer 12 is, for example, indium tin oxide, metal mesh, transparent conductive polymer, and the like.

In one embodiment, the touch control structure 10 further includes a processor (not shown). The touch chip 13 and the display module 18 are respectively electrically connected to the processor. Each pressing portion 162 may correspond to one function. When the touch chip 13 detects a touch action at a position corresponding to a certain pressing portion 162 , it can send a signal to the processor. After receiving the signal, the processor causes the display module 18 to display the button identification of the function corresponding to the pressing portion 162 . . Since the cover plate 16 , the insulating adhesive layer 151 , the touch electrodes 121 , the substrate 11 and the adhesive layer 152 are all light-transmitting corresponding to the pressing portion 162 , the key mark can be viewed by the user.

In one embodiment, the display module 18 may be a liquid crystal display module, a miniature light-emitting diode display module, or an organic light-emitting diode display module, etc., which is not limited herein.

FIG. 4 is a schematic cross-sectional view of the touch control structure 20 according to another embodiment of the present invention. As shown in FIG. 4 , the difference between the touch control structure 20 and the touch control structure 10 is that in the touch control structure 20 , the cover plate 16 is flat and does not include the pressing portion 162 , and the side of the cover plate 16 away from the sensing layer 12 ( That is, the touch surface) is a plane, and the touch structure 20 can be a self-capacitive touch panel.

FIG. 5 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present invention. As shown in FIG. 5 , the electronic device 100 includes a body 30 and a touch control structure 10 ( 20 ) mounted on the body 30 .

In one embodiment, the electronic device 100 may be an operation handle of an electronic game machine, and the pressing portion 162 is a button on the operation handle. The user can control the game avatar by manipulating the button. The pressing part 162 can be used as a function key, a pause key, a home key, or the like. Compared with the traditional physical buttons, the touch-sensitive pressing portion 162 has the advantages of sensitive response, easy operation, simple appearance, and long service life. During the game, the user's line of sight mainly focuses on the game screen, the designer protrudes the touch button from the upper surface of the main body 161, and the user can complete the corresponding operation only by the touch.

In other embodiments, the above-mentioned touch control structure 10 ( 20 ) can also be applied to household appliances such as washing machines, rice cookers, water heaters, and the like. In the touch control structure 10, the pressing portion 162 can be used as a touch button on the household appliance to realize touch operation.

FIG. 6 is a flowchart of a driving method of the touch control structure 10 ( 20 ) according to an embodiment of the present invention. As shown in FIG. 6 , the driving method of the touch control structure 10 ( 20 ) includes the following steps.

Step S1: The touch chip 13 applies the same driving signal to the touch electrode 121 and the ambient electrode 122 through the first trace 141 and the second trace 142 respectively, so that the touch electrode 121 and the The ambient electrodes 122 respectively generate the first sensing signal and the second sensing signal.

Step S2: The touch chip 13 receives the first sensing signal and the second sensing signal through the first wiring 141 and the second wiring 142, respectively, and receives the first sensing signal and the second sensing signal according to the first sensing signal and the second sensing signal. The difference between the two sensing signals determines the touch position.

In this driving method, most of the second sensing signals detected by the touch chip 13 are ambient noise, and since the ambient electrodes 122 and the touch electrodes 121 are in close proximity, the first traces 141 and the second traces 142 are in close proximity, so that The noise contained in the first sensing signal and the second sensing signal are substantially equal. Therefore, the value of the first sensing signal minus the second sensing signal can retain more changes in self-capacitance caused by finger touch behavior. Therefore, the signal-to-noise ratio (the ratio of the signal value to the noise value) detected by the touch chip 13 is improved, so that the touch structure 10 ( 20 ) has higher sensitivity.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. without departing from the spirit and scope of the technical solutions of the present invention.

10: Touch structure

12: Induction layer

121: Touch electrode

122: Environmental Electrode

13: Touch chip

141: The first line

142: Second trace

16: Cover

161: main body

162: Press part

19: circuit board

Claims (8)

A touch control structure is improved, comprising: a substrate having a first surface; a sensing layer located on the first surface, the sensing layer comprising a self-capacitance touch electrode and a touch electrode associated with the touch an environmental electrode with electrodes spaced apart and insulated; and a touch chip, the touch chip is electrically connected to the touch electrode and the environmental electrode through a first wiring and a second wiring respectively; the touch The chip is used for applying the same driving signal to the touch electrode and the environment electrode through the first wire and the second wire respectively, so that the touch electrode and the environment electrode respectively generate a first sensing signal and a second sensing signal; the touch chip is also configured to receive the first sensing signal and the second sensing signal through the first wiring and the second wiring respectively, and according to the first wiring The change of the difference between the sensing signal and the second sensing signal determines the touch position; wherein, perpendicular to the thickness direction of the substrate, the minimum distance between the ambient electrode and the touch electrode is less than 5 mm; along the thickness direction of the substrate , the ratio of the projected area of the ambient electrode on the substrate to the projected area of the touch electrode on the substrate is less than 0.2; the second trace is adjacent to the first trace; the touch structure further includes a cover, The cover plate is located on the side of the sensing layer away from the substrate; the cover plate includes a main body portion and at least one pressing portion protruding from the main body portion in a direction away from the sensing layer, and the pressing portion is aligned with the touch control Electrodes are arranged; along the thickness direction of the substrate, the projection of the pressing portion completely falls within the projection range of the touch electrodes. The touch control structure of claim 1, wherein the difference in length between the second trace and the first trace is less than 10 mm. The touch control structure of claim 1, wherein the second trace and the first trace are equidistant and parallel, and the vertical distance between the second trace and the first trace is less than 10 mm. The touch control structure of claim 1, wherein, along the thickness direction of the substrate, the projection of the pressing portion and the projection of the ambient electrode do not overlap. The touch control structure of claim 1, wherein the cover plate is transparent, the touch control structure further comprises a light shielding layer, the light shielding layer is located on the surface of the cover plate close to the sensing layer, and the light shielding layer corresponds to the pressing The part is provided with a light-passing hole. The touch control structure of claim 1, wherein the touch control structure further includes a display module, the display module is located on a side of the substrate away from the sensing layer, and the substrate and the sensing layer are transparent. An electronic device includes a body and a touch control structure mounted on the body, wherein the touch control structure is the touch control structure according to any one of claims 1 to 6. A method for driving a touch control structure according to any one of claims 1 to 6, comprising: the touch control chip is connected to the touch electrode and the touch electrode through the first wiring and the second wiring respectively. The ambient electrode applies the same driving signal, so that the touch electrode and the ambient electrode generate the first sensing signal and the second sensing signal respectively; and the touch chip uses the first wiring and the first The two traces receive the first sensing signal and the second sensing signal, and determine the touch position according to the change of the difference between the first sensing signal and the second sensing signal.

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