Mutual capacitance touch screen and touch control device having the same

Abstract

The present application provides a mutual capacitance touch screen and a touch control device having the mutual capacitance touch screen, wherein the mutual capacitance touch screen includes: a first dielectric layer having a first surface and a second surface arranged back to back; a first electrode unit arranged on the first surface of the first dielectric layer; and a second electrode unit arranged on the second surface of the first dielectric layer and fitted with the first electrode unit to form a coupling mutual capacitance, wherein the first electrode unit has a first state and a second state; when the first electrode unit is in the second state, the first electrode unit and the second electrode unit form a combination of a driving electrode and a receiving electrode, and the coupling mutual capacitance between the first electrode unit and the second electrode unit is detected to obtain a coordinate of a touch point; and when the first electrode unit is in the first state, the first electrode unit and the second electrode unit form a resonant circuit.

Description

[Technical Field]

[0001] The present application relates to the field of touchscreen technology, and in particular to a mutual capacitance touchscreen and a touch control device having the mutual capacitance touchscreen. [Background technology]

[0002] With the widespread use of devices such as smartphones, laptops, and smartwatches, the functionality of intelligent devices is increasing while at the same time the volume is required to be more compact. Because of the contradiction between these two trends, a trade-off is generally required between the volume and functionality of intelligent devices.

[0003] As the main human-machine interaction means of intelligent devices, touchscreens usually occupy a large area (volume) of the device, but only perform the touch function. Taking a conventional mutual capacitance touchscreen as an example, it generally includes multiple driving electrodes and receiving electrodes to form mutual capacitance and realize touch position detection. However, conventional mutual capacitance touchscreens cannot provide electromagnetic resonance within them, and therefore cannot realize energy transmission using existing elements. Summary of the Invention [Means for solving the problem]

[0004] In view of this, there is a need to provide a mutual capacitance touch screen and a touch control device having the mutual capacitance touch screen, which can realize the function of conventional touch position detection while providing electromagnetic resonance to realize the function of energy transmission.

[0005] A first aspect of the present application provides a mutual capacitance touch screen, the mutual capacitance touch screen comprising: a first dielectric layer including a first surface and a second surface disposed back to back; a first electrode unit disposed on the first surface of the first dielectric layer; a second electrode unit disposed on the second surface of the first dielectric layer and corresponding to the first electrode unit to form a coupling mutual capacitance; wherein the first electrode unit includes a first state and a second state, and when the first electrode unit is in the second state, the first electrode unit and the second electrode unit form a combination of a driving electrode and a receiving electrode, and obtain a coordinate of a touch point by detecting a coupling mutual capacitance between the first electrode unit and the second electrode unit; When the first electrode unit is in the first state, the first electrode unit and the second electrode unit form a resonant circuit.

[0006] According to a first aspect of the present application, in a possible embodiment, the first electrode unit includes a first end and a second end, and when an excitation signal is applied to both the first end and the second end, the first electrode unit is in a first state, and when an excitation signal is applied to either the first end or the second end, the first electrode unit is in a second state.

[0007] According to the first aspect of the present application, in a possible embodiment, when the first electrode unit is in the first state, one equivalent capacitance is formed at each overlapping point between the projection of the first electrode unit on the first dielectric layer and the projection of the second electrode unit on the first dielectric layer, the first electrode unit forms an equivalent inductance, and multiple equivalent capacitances are connected in parallel to the equivalent inductance to form a resonant circuit.

[0008] According to the first aspect of the present application, in a possible embodiment, the first electrode unit includes at least a first electrode and a second electrode, and a switch is installed between the first electrode and the second electrode, and the first electrode and the second electrode are connected or disconnected by the switch.

[0009] According to the first aspect of the present application, in a possible embodiment, the first electrode unit extends along a certain direction centered on one central point and is arranged in a rectangular shape, and the second electrode unit includes a plurality of strip-shaped electrodes.

[0010] According to the first aspect of the present application, in a possible embodiment, the first electrode unit is arranged in a spiral shape, the second electrode unit includes a plurality of azimuth electrodes, and the azimuth electrodes are in the shape of a complete block.

[0011] According to the first aspect of the present application, in a possible embodiment, the first electrode units are arranged concentrically, and the azimuth electrodes are arranged in a sector shape and extend along the radial direction of the circumference.

[0012] According to the first aspect of the present application, in a possible embodiment, the first electrode units are arranged concentrically, and the edges of the azimuth electrodes are sawtooth.

[0013] According to the first aspect of the present application, in a possible embodiment, the orientation electrodes are provided with a plurality of apertures or slots.

[0014] According to the first aspect of the present application, in a possible embodiment, the strip electrodes form an axially symmetrical figure with one center line as the axis of symmetry, the strip electrodes are shaped like a "king", have openings on opposite sides of the strip electrodes, and the opening directions of the multiple strip electrodes are the same.

[0015] According to the first aspect of the present application, in a possible embodiment, the mutual capacitive touch screen further includes a bottom coil layer set consisting of one bottom dielectric layer and one bottom charging coil, which is stacked from top to bottom in the order of a second electrode unit, a first dielectric layer, a first electrode unit, a bottom dielectric layer and a bottom charging coil, and at least one bottom through-hole is opened in the bottom dielectric layer, and the first electrode unit and the bottom charging coil are connected by the bottom through-hole.

[0016] According to the first aspect of the present application, in a possible embodiment, the mutual capacitive touch screen further includes at least one intermediate coil layer set composed of an intermediate dielectric layer and an intermediate charging coil, the intermediate coil layer set is installed between the first electrode unit and the bottom coil layer set, each intermediate coil layer set has an intermediate dielectric layer installed above the intermediate charging coil, each intermediate dielectric layer has at least one intermediate through-hole, and the first electrode unit and each intermediate charging coil and bottom charging coil are connected by the intermediate through-hole and the bottom through-hole.

[0017] According to a first aspect of the present application, in a possible embodiment, the mutual capacitive touch screen further includes a circuit layer set consisting of a circuit dielectric layer and a first wiring, the circuit dielectric layer is disposed above the first wiring, the circuit layer set and the bottom coil layer set are adjacent to each other, and the circuit layer is disposed above the bottom coil layer, and the first wiring is connected to the first electrode unit and / or the second electrode unit.

[0018] According to the first aspect of the present application, in a possible embodiment, the bottom coil layer set further includes a second wiring, the second wiring is installed in the same layer as the bottom charging coil, and the second wiring is connected to the first electrode unit and / or the second electrode unit.

[0019] According to the first aspect of the present application, in a possible embodiment, the second electrode unit, the first dielectric layer, the first electrode unit, the middle coil layer set and the bottom coil layer set are integrated within the same printed circuit board.

[0020] According to the first aspect of the present application, in a possible embodiment, the mutual capacitance touch screen further includes a cover plate, and the cover plate is disposed on one side of the second electrode unit away from the first dielectric layer.

[0021] A second aspect of the present application provides a touch control device, which includes a driving chip and the above mutual capacitance touch screen, and the mutual capacitance touch screen is electrically connected to the driving chip.

[0022] According to a second aspect of the present application, in a possible embodiment, the touch control device dynamically switches a resonant circuit formed by a first electrode unit and a second electrode unit to a preset frequency point, so as to transmit energy to an external device at the same frequency point or receive energy from an external device at the same frequency point.

[0023] According to a second aspect of the present application, in a possible embodiment, the first electrode unit includes a plurality of electrodes, and the touch control device can place different electrodes in the first electrode unit at different frequency points, so that the touch control device simultaneously transmits energy to or receives energy from an external device corresponding to different frequency points.

[0024] According to a second aspect of the present application, in a possible embodiment, the mutual capacitance touch screen forms a resonant circuit between the first electrode unit and the second electrode unit within the set area.

[0025] According to a second aspect of the present application, in a possible embodiment, the driving chip includes a touch driving chip, a wireless control chip, and a plurality of switching switches, a first end of each switching switch is connected to the first electrode unit, a second end is connected to the touch driving chip, and a third end is connected to the wireless control chip, and the first state and the second state of the first electrode unit can be switched by the switching switches. [Effects of the Invention]

[0026] Compared with the prior art, the present application has at least the following beneficial effects:

[0027] By placing the first electrode unit in different configuration states, i.e., by forming a resonant circuit with the second electrode unit in the first state, the mutual capacitive touch screen can achieve a frequency selection function. The touch control device dynamically switches the resonant circuit formed by the first electrode unit and the second electrode unit to a preset frequency point, thereby realizing transmitting energy to or receiving energy from an external device at the same frequency point. Furthermore, by placing different electrodes in the first electrode unit at different frequency points, the touch control device can simultaneously transmit energy to or receive energy from an external device corresponding to different frequency points, and the external device can simultaneously transmit and receive energy. In the second state, the first electrode unit and the second electrode unit form a combination of driving electrodes and receiving electrodes, achieving a conventional touch position detection function. In this way, touch position detection and energy transmission are simultaneously achieved. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a structural schematic diagram of a mutual capacitance touch screen in an embodiment of the present application; [Figure 2] FIG. 2 is a structural schematic diagram of a first electrode unit in the mutual capacitance touch screen shown in FIG. 1; [Figure 3] FIG. 2 is a structural schematic diagram of a second electrode unit in the mutual capacitance touch screen shown in FIG. 1; [Figure 4] 2 is a schematic diagram illustrating an overlap of a first electrode unit and a second electrode unit in the mutual capacitance touch screen shown in FIG. 1; [Figure 5] 2 is a schematic diagram of the mutual capacitance touch screen shown in FIG. 1 in which a first electrode unit is in a first state; [Figure 6] 2 is a schematic diagram of a parallel resonant circuit formed by a first electrode unit and a second electrode unit in the mutual capacitance touch screen shown in FIG. 1; [Figure 7]2 is a schematic diagram of the mutual capacitance touch screen shown in FIG. 1 in which the first electrode unit is in a second state; [Figure 8] FIG. 2 is another structural schematic diagram of a mutual capacitance touch screen in an embodiment of the present application; [Figure 9] FIG. 9 is a structural schematic diagram of a first electrode unit in the mutual capacitance touch screen shown in FIG. 8; [Figure 10] FIG. 9 is a structural schematic diagram of a second electrode unit in the mutual capacitance touch screen shown in FIG. 8; [Figure 11] FIG. 2 is another structural schematic diagram of a mutual capacitance touch screen in an embodiment of the present application; [Figure 12] FIG. 12 is a structural schematic diagram of a second electrode unit in the mutual capacitance touch screen shown in FIG. [Figure 13] FIG. 2 is a structural schematic diagram of a second electrode unit in an embodiment of the present application. [Figure 14] FIG. 2 is another structural schematic diagram of a mutual capacitance touch screen in an embodiment of the present application; [Figure 15] FIG. 2 is another structural schematic diagram of a mutual capacitance touch screen in an embodiment of the present application; [Figure 16] 1 is a structural schematic diagram of a touch control device in an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0029] The following specific embodiments further describe the present application with reference to the above drawings.

[0030] In order to make the above objects, features and advantages of the present invention more clearly comprehensible, the present invention will be described in detail below with reference to the drawings and specific embodiments. It should be noted that, if there is no conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0031] In the following description, many specific details are described to fully understand the present invention, and the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative labor fall within the scope of protection of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in the present specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. [Example]

[0033] 1, an embodiment of the present application provides a mutual capacitance touch screen 100. The mutual capacitance touch screen 100 includes a first dielectric layer 30, a first electrode unit 10 and a second electrode unit 20.

[0034] As can be understood, the first dielectric layer 30 may be one of a film, glass, plastic, a printed circuit board (PCB), or other materials, and is not limited thereto.

[0035] The first dielectric layer 30 includes a first surface 31 and a second surface 32 that are arranged back to back. The first electrode unit 10 and the second electrode unit 20 are arranged on both back to back surfaces of the first dielectric layer 30. For example, the first electrode unit 10 is arranged on the first surface 31, and the second electrode unit 20 is arranged on the second surface 32.

[0036] As shown in Fig. 2, Fig. 2 is a structural schematic diagram of the first electrode unit 10. The first electrode unit 10 extends inward or outward in a certain direction around a central point, and is disposed in a certain shape on the first dielectric layer 30. For example, the first electrode unit 10 starts at one end, extends counterclockwise from the inside to the outside around the central point A, and is disposed in a rectangular shape on the first dielectric layer 30.

[0037] In possible embodiments, the first electrode unit 10 includes a first electrode 11 and a second electrode 12 connected to each other. Specifically, the first electrode 11 has a first end 101 and a second end 102, and the second electrode 12 has a third end 103 and a fourth end 104. The second end 102 is connected to the third end 103, thereby connecting the first electrode 11 and the second electrode 12 to form a single unit. In these embodiments, the first electrode 11 starts at the first end 101 and extends counterclockwise from the center point A to the other end, forming a rectangular shape on the first dielectric layer 30. The third end 103 of the second electrode 12 is connected to the second end 102 of the first electrode 11 and extends counterclockwise from the center point A to the fourth end 104, forming a rectangular shape on the first dielectric layer 30.

[0038] In a possible embodiment, a switch (not shown) is further installed between the second end 102 and the third end 103, and the first electrode unit 10 can realize connection or disconnection between the first electrode 11 and the second electrode 12 by opening and closing the switch.

[0039] As will be appreciated, in other embodiments, the first electrode unit 10 may further include other electrodes similar in structure to the first electrode 11 and the second electrode 12 and surrounding the periphery of the first electrode 11.

[0040] As shown in FIG. 3, FIG. 3 is a schematic diagram of the second electrode unit 20. The second electrode unit 20 includes a plurality of strip electrodes 21. The plurality of strip electrodes 21 are disposed on the first dielectric layer 30 to form an array matrix, with no strip electrode disposed at the center of the array matrix. Specifically, an XY-axis coordinate system is established as shown in FIG. 3, with each strip electrode 21 located within one coordinate cell. No strip electrode 21 is disposed within coordinate cells at intermediate positions.

[0041] As can be understood, the number of strip electrodes 21 in the second electrode unit 20 and the number of coordinate cells in which strip electrodes 21 are not installed can both be set as needed. For example, strip electrodes 21 are not installed in one, four, or nine coordinate cells located in the middle positions. Taking FIG. 3 as an example, FIG. 3 has a total of 7 x 7 = 49 coordinate cells. Strip electrodes 21 are not installed in the nine coordinate cells located in the middle positions, that is, the second electrode unit 20 has a total of 40 strip electrodes 21.

[0042] In a possible embodiment, each strip electrode 21 forms an axially symmetrical figure with a center line (not shown) as the axis of symmetry. The strip electrode 21 has, for example, a "king" shape. The strip electrode 21 has openings 201 on opposite sides. The openings 201 of the multiple strip electrodes 21 are all arranged along the same direction, for example, along the Y-axis direction in the figure.

[0043] 4 also shows a schematic diagram of the engagement between the first electrode unit 10 and the second electrode unit 20. The projections of the first electrode unit 10 and the second electrode unit 20 on the first dielectric layer 30 (see FIG. 1) overlap. Specifically, the projection of the strip electrodes in the second electrode unit 20 on the first dielectric layer 30 overlaps the projection of the first electrode 11 or the second electrode 12 in the first electrode unit 10 on the first dielectric layer 30.

[0044] 4 as an example, a total of 40 strip electrodes are installed in the second electrode unit 20. The projections of the strip electrodes in the coordinate cells located in two columns of X=1 and X=7 and the strip electrodes in the coordinate cells located in two rows of Y=1 and Y=7 on the first dielectric layer 30 all overlap with the projections of the second electrodes 12 on the first dielectric layer 30, i.e., a total of 24 strip electrodes are installed to be interdigitated with the second electrodes 12. The remaining 16 strip electrodes in the second electrode unit 20 are installed to be interdigitated with the first electrodes 11 in the same manner, and their description will be omitted here.

[0045] As can be seen, the first electrode unit 10 and the second electrode unit 20 can form electric field coupling, and further form a mutual capacitance matrix. The mutual capacitance matrix includes a plurality of coupling mutual capacitances, and the coupling mutual capacitances are mainly concentrated at overlapping points between the projections of the first electrode unit 10 and the second electrode unit 20 on the first dielectric layer 30. In a possible embodiment, a coupling mutual capacitance is formed at every overlapping point between each strip electrode in the second electrode unit 20 and the projection of the first electrode unit 10 on the first dielectric layer 30.

[0046] 5 and 7, in the embodiment of the present application, the first electrode unit 10 includes two states, namely, a first state (see FIG. 5) and a second state (see FIG. 7). For ease of explanation, the following description will be given taking the first electrode unit 10 including only the first electrode 11 as an example. It can be understood that if the first electrode unit 10 includes multiple electrodes, for example, a first electrode 11 and a second electrode 12, the first electrode 11 and the second electrode 12 are connected in series, and the principle thereof is consistent with the principle described below.

[0047] FIG. 5 is a schematic diagram showing the first electrode unit 10 in a first state. In this embodiment, the first electrode unit 10 is in the first state when opposite excitation signals (e.g., AC electrical signals) are applied to both ends of the first electrode unit 10. For example, a negative excitation signal (e.g., excitation voltage V-) is applied to the first end 101, and a positive excitation signal (e.g., excitation voltage V+) is applied to the second end 102. It can be understood that a positive excitation signal (e.g., excitation voltage V+) can be applied to the first end 101, and a negative excitation signal (e.g., excitation voltage V-) can be applied to the second end 102. It can be understood that when a negative excitation signal is applied to one end of the first electrode unit 10 and a positive excitation signal is applied to the other end, the first electrode unit 10 forms a current circuit.

[0048] As can be understood, when opposite excitation signals are supplied to both ends (e.g., the first end 101 and the second end 102) of the first electrode 11 to form a current circuit as described above, if the strip electrodes located in the same column in the second electrode unit 20 are connected, the first electrode unit 10 and the second electrode unit 20 are equivalent to a parallel resonant circuit.

[0049] Specifically, referring also to FIG. 6, FIG. 6 is a schematic diagram of a parallel resonant circuit 1001 configured with a first electrode unit 10 and a second electrode unit 20. Here, the parallel resonant circuit 1001 includes a plurality of equivalent capacitances C1 to C2 connected in parallel. i , including the equivalent inductance L and loss resistance R. As shown in FIG. 6, all the equivalent capacitances C1 to C i One end of the equivalent inductance L and one end of the loss resistance R are all connected to the excitation voltage V+, and all of the equivalent capacitances C1 to C i The other end of the equivalent inductance L and the other end of the loss resistance R are all connected to the excitation voltage V-.

[0050] As can be seen, the mutual capacitance formed by the engagement of the first electrode 11 with the strip electrodes of the second electrode unit 20 (e.g., the parallel connection of the second electrode unit 20 with the first electrode 11) constitutes a corresponding equivalent capacitance. Taking FIG. 6 as an example, 16 strip electrodes of the second electrode unit 20 are engaged with the first electrodes 11, and therefore the engagement of the first electrodes 11 with the strip electrodes of the second electrode unit 20 forms 16 equivalent capacitances. That is, with appropriate arrangement, the parallel resonant circuit 1001 connects a total of 16 equivalent capacitances in parallel, i.e., i=16.

[0051] Furthermore, as described above, when opposite excitation signals are supplied to both ends (e.g., the first end 101 and the second end 102) of the first electrode 11 to form a current circuit, i.e., when the first electrode unit 10 is in the first state, the first electrode unit 10 corresponds to a current-carrying spiral, and a magnetic field is generated around it. The magnetic field direction of the current-carrying spiral satisfies the "right-handed spiral rule," and the strength of the magnetic field depends on the shape and material of the first electrode unit 10 itself. Thus, the first electrode 11 corresponds to one equivalent inductance L in the parallel resonant circuit 1001. In a possible embodiment, the value of the equivalent inductance L can be changed by adjusting the parameters of the first electrode unit 10 (e.g., the number, shape, and material of the electrodes).

[0052] Specifically, the value of the equivalent inductance L is given by equation (1):

number

[0053] where l is the length of the coil (e.g., the first electrode unit 10) in meters, k is the Nagaoka coefficient, k=2R / 1, and R is the radius. μ0 is the vacuum permeability, μ0=4π×10 -7 μ S is the relative permeability of the inner core of the coil (e.g., the first electrode unit 10), N is the number of turns of the coil (e.g., the first electrode unit 10), and S is the cross-sectional area of the coil (e.g., the first electrode unit 10), in square meters.

[0054] As can be seen, when the first electrode unit 10 includes the first electrode 11 and the second electrode 12, the first electrode 11 and the second electrode 22 are connected in series, and thus the parallel resonant circuit 1001 can obtain a larger equivalent inductance L. The loss resistance R of the parallel resonant circuit 1001 is affected by factors such as the shape, material, and medium of the first electrode 11 and the strip electrodes.

[0055] As can be seen, the parallel resonant circuit 1001 has a corresponding resonant frequency,

number

number

[0056] The 3 dB bandwidth of the parallel resonant circuit 1001 is BW 3dB =ω0 / Q, where Q is the quality factor of the parallel resonant circuit 1001. The squareness factor of the parallel resonant circuit 1001 is BW 0.1 =10×BW 3dB is.

[0057] As can be seen, by placing the first electrode unit 10 in the first state and forming a parallel resonant circuit 1001 with the second electrode unit 20, the mutual capacitive touch screen 100 has a corresponding frequency selection function and can transmit energy within a certain range. By adjusting the related parameters, such as the shapes, materials, etc. of the first electrode unit 10 and the second electrode unit 20, the energy within the passband can be transmitted and the energy outside the passband can be effectively suppressed.

[0058] 3 and 4, it should be noted that in some embodiments, when the first electrode unit 10 is in the first state, if the strip electrodes located in the same row of the second electrode unit 20 are connected together, for example, if the strip electrodes 21 in the coordinate cells located in two rows, Y=1 and Y=7, are connected respectively, the first electrode unit 10 and the second electrode unit 20 are also equivalent to a parallel resonant circuit. In other embodiments, when the first electrode unit 10 is in the first state, the strip electrodes 21 in the same row or column are not connected together, and the mutual capacitance formed by the interdigitation of the first electrode unit 10 and the second electrode unit 20 simply exhibits an array matrix shape. It can be understood that in these embodiments, the value of the equivalent inductance L cannot be obtained by applying Equation (1) in the above examples.

[0059] As can be seen, when an excitation signal is applied to the first electrode unit 10 (e.g., the first electrode 11) but no current circuit is formed, the first electrode unit 10 is in the second state, and its magnetic field effect disappears. Specifically, referring again to FIG. 7, a schematic diagram of the first electrode unit 10 in the second state is shown. When the first electrode unit 10 is in the second state, an excitation signal is applied to one of the first end 101 or the second end 102 of the first electrode unit 10. For example, an excitation voltage V+ is applied only to the first end 101, and the second end 102 is suspended. At this time, only a mutual capacitance matrix is formed between the first electrode unit 10 and the second electrode unit 20.

[0060] It can be understood that when a mutual capacitance matrix is formed between the first electrode unit 10 and the second electrode unit 20, the first electrode unit 10 can be used as a touch driving electrode and the second electrode unit 20 can be used as a touch receiving electrode. Alternatively, the second electrode unit 20 can be used as a touch driving electrode and the first electrode unit 10 can be used as a touch receiving electrode. That is, in this embodiment, the first electrode unit 10 and the second electrode unit 20 form a combination of a driving electrode and a receiving electrode, and the touch point coordinate is obtained by detecting the coupling mutual capacitance between the first electrode unit 10 and the second electrode unit 20. In this way, the touch position detection function of the mutual capacitance touch screen 100 is realized. [Example]

[0061] 8 to 10, another mutual capacitance touch screen 100a (see FIG. 8) provided by an embodiment of the present application is shown. As shown in FIGS. 8 to 10, the structure of the mutual capacitance touch screen 100a is similar to that of the mutual capacitance touch screen 100, except that the structure of the first electrode unit 10a is different from that of the first electrode unit 10, and the structure of the second electrode unit 20a is different from that of the second electrode unit 20.

[0062] As shown in FIG. 9, in Example 2, the first electrode unit 10a includes a first electrode 11a and a second electrode 12a. The first electrode unit 10a has a planar spiral shape. In a possible embodiment, the first electrode unit 10a extends counterclockwise from the inside to the outside around a central point (e.g., point B) and is arranged concentrically on the first dielectric layer 30 (see FIG. 1). As can be understood, a concentric shape is a special example of a planar spiral shape. The planar spiral shape may also include an elliptical shape, etc.

[0063] As shown in FIG. 10, the second electrode unit 20a includes a plurality of azimuth electrodes θ i The number of the electrodes can be set as needed, for example, six. i The shape of the azimuth electrode θ is a complete block.i The specific shape of is a substantially sector shape, and extends from the geometric center point of the first electrode unit 10a along the radial direction of the circumference.

[0064] In a possible embodiment, when the first electrode unit 10a is in the second state, i.e., when the first electrode unit 10a and the second electrode unit 20a only provide the touch function, the azimuth electrode θ i By installing the electrode θ , the touch position can be indicated in polar coordinates. Specifically, the distance from any point on the first electrode unit 10a to the center point B is used to display the radius of the polar coordinates, and the azimuth electrode θ , where the second electrode unit 20a is located, is used to display the radius of the polar coordinates. i is used to display the azimuth angle in polar coordinates.

[0065] As can be seen, an excitation signal is applied across the first electrode unit 10a, which is composed of the first electrode 11a and the second electrode 12a, to form a circuit, which then forms an inductance and generates a magnetic field effect, and then forms a parallel resonant circuit with the second electrode unit 20a, thereby transmitting energy at a specific frequency. [Example]

[0066] 11 and 12, another mutual capacitive touch screen 100b (see FIG. 11) is provided in an embodiment of the present application. As shown in FIGS. 11 and 12, the structure of the mutual capacitive touch screen 100b is similar to that of the mutual capacitive touch screen 100a. For example, the first electrode 11b and the second electrode 12b in the first electrode unit 10b are basically the same as the first electrode 11a and the second electrode 12a in the first electrode unit 10a. The difference is that the structure of the second electrode unit 20b is different from that of the second electrode unit 20a.

[0067] Specifically, the azimuth electrode θ of the second electrode unit 20b i The shape of the azimuth electrode θ i The edges are saw-toothed.

[0068] As shown in Figs. 10 and 12, the azimuth electrode θ i When the edges of the electrodes are arranged in a straight line as shown in Figure 10, the adjacent electrodes θ i A nearly straight channel 205 is installed between the azimuth electrode θ6. For example, when a finger touches the area corresponding to the azimuth electrode θ6 to form a touch area 204 as shown in FIG. 10, the touch area 204 is located at the center of the azimuth electrode θ6. At this time, the distances from the touch area 204 to the adjacent electrodes θ5 and θ6 on the left and right are both far, and the touch sensing amount is small. i 12, if the finger is placed in the same position as in FIG. 10 to form the same size touch area 204, the touch area 204 will further cover the partial electrodes θ5 and θ6 due to the presence of bends in the adjacent channels 205a on the left and right. Thus, the touch sensing amount increases accordingly. As can be seen, when the touch sensing amount increases, the calculation accuracy for the touch position (e.g., angle) also increases accordingly, i.e., the accuracy of the calculation for the azimuth electrodes θ i By setting the angle to a sawtooth shape, it is possible to reduce errors in angle detection. [Example]

[0069] 13, another mutual capacitance touch screen (not shown) provided by an embodiment of the present application is shown. As shown in FIG. 13, the structure of the mutual capacitance touch screen is similar to that of the mutual capacitance touch screen 100b, except that the structure of the second electrode unit 20c is different from that of the second electrode unit 20b.

[0070] Specifically, the azimuth electrode θ of the second electrode unit 20c i A plurality of apertures 202 and slots 203 are provided in the substrate.

[0071] As can be seen, by installing the apertures 202 and slots 203, when the first electrode unit (not shown) and the second electrode unit 20c form a parallel resonant circuit, the electromagnetic field can effectively penetrate the second electrode unit 20c, further adjusting the energy transmission efficiency and frequency range. [Example]

[0072] 14 , an embodiment of the present application further provides a mutual capacitance touch screen 200. The mutual capacitance touch screen 200 includes a second electrode unit 210, a first electrode unit 220, a first dielectric layer 230, and a bottom coil layer set 240.

[0073] Here, the second electrode unit 210 can be a receiving electrode, and the second electrode unit 210 can be the second electrode unit 20 / 20a / 20b / 20c in the above embodiment. The first electrode unit 220 can be a transmitting electrode, and the first electrode unit 220 can be the first electrode unit 10 / 10a / 10b in the above embodiment. The first dielectric layer 231 can be the first dielectric layer 30 in the above embodiment. The second dielectric layer 232 can be made of the same material as the first dielectric layer 231.

[0074] The second electrode unit 210 is disposed back to back with the first electrode unit 220 on both sides of the first dielectric layer 230. The bottom coil layer set 240 is located on one side of the first electrode unit 220.

[0075] In this embodiment, the bottom coil layer set 240 is composed of a bottom dielectric layer 241 and a bottom charging coil 242. Thus, the mutual capacitive touch screen 200 has a stacked structure of the second electrode unit 210, the first dielectric layer 230, the second electrode unit 210, the bottom dielectric layer 241, and the bottom charging coil 242 from top to bottom along the X-axis direction. As can be seen, the bottom charging coil 242 is a wireless charging coil.

[0076] At least one bottom through-hole 2411 is opened in the bottom dielectric layer 241, and the first electrode unit 220 is connected to the bottom charging coil 242, with the connection portion located within the bottom through-hole 2411. That is, the first electrode unit 220 and the bottom charging coil 242 are connected by the bottom through-hole 2411. As can be understood, the first electrode unit 220 can be multiplexed as a charging coil. In this way, the first electrode unit 220 and the bottom charging coil 242 can form a charging coil combination, and by locating different electrodes in the first electrode unit 220 at different frequency points, the touch control device can simultaneously transmit energy to or receive energy from external devices corresponding to different frequency points, and the external device can simultaneously transmit and receive energy.

[0077] In a possible implementation, the mutual capacitive touch screen 200 further includes a circuit layer set 250. The circuit layer set 250 is located between the first electrode unit 220 and the bottom coil layer set 240. The circuit layer set 250 includes a circuit dielectric layer 251 and a first wiring 252, and the circuit dielectric layer 251 is disposed above the first wiring 252 (i.e., closer to the first electrode unit 220). The first wiring 252 is connected to the first electrode unit 220 and / or the second electrode unit 210 (connection relationship not shown).

[0078] In this embodiment, at least one circuit layer through-hole is provided in the circuit dielectric layer 251, and the circuit layer through-hole 2511 is provided corresponding to and communicates with the bottom through-hole 2411. In this manner, the first electrode unit 220 and the bottom charging coil 242 can be connected within the circuit layer through-hole and the bottom through-hole 2411. It can be understood that the circuit layer through-hole 2511 and the bottom through-hole 2411 can be provided to avoid the first wiring 252 of the circuit layer set 250.

[0079] In a possible embodiment, the bottom coil layer set 240 further includes a second wiring 243. The second wiring 243 is disposed in the same layer as the bottom charging coil 242. That is, the second wiring 243 and the bottom charging coil 242 are both located on one side of the bottom dielectric layer 241 away from the second electrode unit 210. The second wiring 243 is connected to the first electrode unit 220 and / or the second electrode unit 210.

[0080] As can be understood, the first electrode unit 220 or the second electrode unit 210 selectively connects the first wiring 252 or the second wiring 243 based on the wiring distance. For example, if the wiring distance when connecting via the first wiring 252 is closer, the first wiring 252 is selected to be connected, and if the wiring distance when connecting via the second wiring 243 is closer, the second wiring 243 is selected to be connected.

[0081] As can be seen, installing the charging coil in two layers, i.e., installing the charging coil in two layers consisting of the first electrode unit 220 and the bottom charging coil 242, can reduce the impedance of the entire charging coil compared to a single-layer installation (i.e., installing only the first electrode unit 220), and further reduce the energy loss of the charging coil itself, thereby improving output efficiency.

[0082] Furthermore, because the metal layer of the first electrode unit 220 is thin and has poor heat dissipation capability, a two-layer installation method is adopted to transfer the heat from the first electrode unit 220 located on the inside to the bottom charging coil 242 located on the bottom layer via the connection part in the bottom through-hole 2411, and then dissipate it through the bottom charging coil 242. In this way, the heat generated by the device can be quickly dissipated, further reducing the temperature of the electronic device and effectively improving the service life of the electronic device.

[0083] In a possible implementation, the mutual capacitive touch screen 200a further includes a cover plate, and a user can achieve touch control by touching the cover plate. It should be understood that the material of the cover plate is not limited herein and may be, for example, a glass plate, a Mylar plate, a film, etc. [Example]

[0084] 15 , an embodiment of the present application further provides a mutual capacitance touch screen 200a. The mutual capacitance touch screen 200a has a similar structure to the mutual capacitance touch screen 200, except that the mutual capacitance touch screen 200a further includes at least one middle coil layer set 260. The middle coil layer set 260 is located between the first electrode unit 220 and the bottom coil layer set 240.

[0085] Here, the intermediate coil layer set 260 includes an intermediate dielectric layer 261 and an intermediate charging coil 262. The intermediate dielectric layer 261 in each intermediate coil layer set 260 is located above the intermediate charging coil 262 (i.e., located on the side closer to the first electrode unit 220).

[0086] Each intermediate dielectric layer 261 has at least one intermediate through-hole 2611, through which the first electrode unit 220 is connected to the intermediate charging coil 262, and the connection portion is located within the intermediate through-hole 2611. That is, the first electrode unit 220 and each intermediate charging coil 262 are connected by the intermediate through-hole 2611.

[0087] In a possible embodiment, the first electrode unit 220 is sequentially connected to the middle charging coil 262 and the bottom charging coil 242. Specifically, the first electrode unit 220 and the middle charging coil 262 are connected by a middle through-hole 2611, and the middle charging coil 262 and the bottom charging coil 242 are connected by a bottom through-hole 2411. That is, the first electrode unit 220 and each of the middle charging coils 262 and bottom charging coils 242 are connected by each of the middle through-holes 2611 and bottom through-holes 2411.

[0088] As can be appreciated, the number of intermediate coil layer sets 260 is not limited here, and there can be one, two (as shown in FIG. 15 ), or multiple intermediate coil layer sets 260. When there is more than one intermediate coil layer set 260, the intermediate charging coils 262 of adjacent intermediate coil layer sets 260 are connected by intermediate through-holes 2611 in the intermediate dielectric layer 261 located in the underlying layer (i.e., of the bottom coil layer set 240).

[0089] In a possible embodiment, in this embodiment, the circuit layer set 250 and the bottom coil layer set 240 are disposed adjacent to each other, so that the mutual capacitive touch screen 200a forms a stacked structure of, from top to bottom, the second electrode unit 210, the first dielectric layer 230, the first electrode unit 220, the middle coil layer set 260, the circuit dielectric layer 251, the first wiring 252, the bottom dielectric layer 241, and the bottom charging coil 242.

[0090] As can be understood, the bottom charging coil 242 is always located at the bottom layer of the mutual capacitive touchscreen 200a, regardless of whether the mutual capacitive touchscreen 200a has several intermediate coil layer sets 260. In this way, the heat generated by the charging coils located in the inner layers (e.g., the first electrode unit 220 and the intermediate charging coil 262) is transferred from the inside to the bottom charging coil 242 located in the outermost layer, and the heat can be dissipated by the bottom charging coil 242. [Example]

[0091] 16, an embodiment of the present application further provides a touch control device 300. The touch control device 300 includes a driving chip and a mutual capacitance touch screen 310, which can adopt the mutual capacitance touch screen 100 / 100a / 100b / 200 / 200a in the above embodiments.

[0092] The mutual capacitance touch screen 310 is electrically connected to the driver chip by a connecting line, which may include the first wiring 252 and the second wiring 243 in the fifth or sixth embodiment.

[0093] In a possible embodiment, the mutual capacitive touch screen 310 of the touch control device 300 has a set area, and the first electrode units 10 / 10a / 10b / 220 and the second electrode units 20 / 20a / 20b / 20c / 210 in the set area can form a resonant circuit. That is, not all of the electrode units (e.g., the first electrode units 10 / 10a / 10b / 220) can be multiplexed as charging coils. For example, the mutual capacitive touch screen 310 can be divided into an upper half area and a lower half area, and only the electrode units located in either the upper half area or the lower half area can be multiplexed as charging coils.

[0094] In one possible embodiment, the driver chip includes a touch driver chip, a wireless control chip, and a plurality of switches, each of which has a first end connected to the first electrode unit 10 / 10a / 10b / 220, a second end connected to the touch driver chip, and a third end connected to the wireless control chip, and the first state and the second state of the first electrode unit 10 / 10a / 10b / 220 can be switched by the switch.

[0095] In a possible embodiment, the second electrode unit 210, the first dielectric layer 230, the first electrode unit 220, the middle coil layer set 260, the circuit layer set 250, and the bottom coil layer set 240 are all integrated in a printed circuit board (PCB). The touch control device 300 includes a plurality of elements, including the driver chips, and further including, for example, resistors, capacitors, etc. These elements are disposed on the back surface of the printed circuit board.

[0096] It can be understood that the mutual capacitance touch screen 310 collects touch information through the amount of coupling signal between the first electrode unit and the second electrode unit, and further realizes the function of touch position detection.

[0097] As can be appreciated, the touch control device may be circular, near-circular, rectangular, or rectangular with corners, etc.

[0098] In a possible embodiment, the touch control device 300 further includes a glass cover plate 320 , a back rubber 330 and a ferrite 340 .

[0099] The back rubber 330 is disposed between the glass cover plate 320 and the mutual capacitive touch screen 310 and is used to bond the glass cover plate 320 and the mutual capacitive touch screen 310 together. The ferrite 340 is located on one side of the mutual capacitive touch screen 310 away from the glass cover plate 320.

[0100] As can be seen, the mutual capacitance touch screen 310 further includes an interface 311, one end of which is connected to the wiring on the mutual capacitance touch screen 310, and the other end of which is used to connect to the motherboard of the electronic device. [Example]

[0101] An embodiment of the present application further provides an electronic device, which includes the touch control device in the above embodiment, and the electronic device may be, but is not limited to, a smartphone, a tablet, a watch, an earphone, a laptop, etc.

[0102] Apparently, the present application provides that by putting the first electrode unit 10 / 10a / 10b / 220 into different configuration states and forming a resonant circuit with the second electrode unit 20 / 20a / 20b / 20c / 210 in the first state, the mutual capacitive touch screen 100 / 100a / 100b / 200 / 200a can realize a frequency selection function, and the touch control device in the electronic device can dynamically switch the resonant circuit formed by the first electrode unit 10 / 10a / 10b / 220 and the second electrode unit 20 / 20a / 20b / 20c / 210 to a preset frequency point, thereby realizing transmitting energy to or receiving energy from an external device at the same frequency point. Furthermore, by providing multiple electrodes (e.g., first and second electrodes) in the first electrode unit 10 / 10a / 10b / 220 and providing different electrodes at different frequency points, the touch control device can simultaneously transmit energy to or receive energy from an external device corresponding to different frequency points, and the external device can simultaneously transmit and receive energy. In the second state, the second electrode unit 20 / 20a / 20b / 20c / 210 forms a combination of driving electrodes and receiving electrodes to achieve the conventional touch position detection function. In this way, the touch position detection function and the energy transmission function are simultaneously achieved.

[0103] In this application, when the first electrode unit 10 / 10a / 10b / 220 is in the first state, it can realize wireless charging, short-range communication, and multiple communication functions such as amplitude modulation (AM), frequency modulation (FM), wireless intercom, Bluetooth, WIFI, etc.

[0104] Those skilled in the art will appreciate that the above embodiments are for illustrating the present application, and do not limit the present application, and that appropriate modifications and variations made to the above examples within the substantial spirit of the present application should fall within the scope of the claims of the present application.

Claims

1. a first dielectric layer including a first surface and a second surface disposed back-to-back; a first electrode unit disposed on the first surface of the first dielectric layer; a second electrode unit disposed on the second surface of the first dielectric layer and corresponding to the first electrode unit to form a coupling mutual capacitance; wherein the first electrode unit includes a first state and a second state, and when the first electrode unit is in the second state, the first electrode unit and the second electrode unit form a combination of a driving electrode and a receiving electrode, and obtain a coordinate of a touch point by detecting a coupling mutual capacitance between the first electrode unit and the second electrode unit; When the first electrode unit is in the first state, the first electrode unit and the second electrode unit form a resonant circuit.

2. the first electrode unit includes a first end and a second end; When an excitation signal is applied to both the first end and the second end, the first electrode unit is in the first state; The mutual capacitive touch screen of claim 1 , wherein the first electrode unit is in the second state when an excitation signal is applied to the first end or the second end.

3. 2. The mutual capacitance touch screen of claim 1, wherein when the first electrode unit is in the first state, an equivalent capacitance is formed at each overlapping point between a projection of the first electrode unit on the first dielectric layer and a projection of the second electrode unit on the first dielectric layer, the first electrode unit forms an equivalent inductance, and a plurality of the equivalent capacitances are connected in parallel to the equivalent inductance to form the resonant circuit.

4. 2. The mutual capacitive touch screen of claim 1, wherein the first electrode unit includes at least a first electrode and a second electrode, a switch is installed between the first electrode and the second electrode, and the first electrode and the second electrode can be connected or disconnected by the switch.

5. 2. The mutual capacitive touch screen of claim 1, wherein the first electrode unit is rectangular, extends in a certain direction around a central point, and the second electrode unit includes a plurality of strip-shaped electrodes.

6. The mutual capacitance touch screen of claim 1, wherein the first electrode unit is arranged in a spiral shape, the second electrode unit includes a plurality of azimuth electrodes, and the azimuth electrodes are in a complete block shape.

7. The mutual capacitive touch screen of claim 6, wherein the first electrode units are arranged concentrically, and the azimuth electrodes are arranged in a fan shape and extend along the radial direction of the circumference.

8. The mutual capacitance touch screen according to claim 6 or 7, wherein the first electrode units are arranged concentrically, and the edges of the azimuth electrodes are sawtooth.

9. The mutual capacitance touch screen of claim 6, wherein the azimuth electrodes have a plurality of openings or slots.

10. The mutual capacitive touch screen of claim 5, characterized in that the strip electrodes form an axially symmetrical figure with a central line as an axis of symmetry, the strip electrodes are shaped like a "King", the strip electrodes have openings on opposite sides, and the opening directions of the multiple strip electrodes are the same.

11. further comprising a bottom coil layer set consisting of one bottom dielectric layer and one bottom charging coil; A stacked structure is formed of, from top to bottom, the second electrode unit, the first dielectric layer, the first electrode unit, the bottom dielectric layer, and the bottom charging coil; 2. The mutual capacitive touch screen according to claim 1, wherein the bottom dielectric layer has at least one bottom through-hole, and the first electrode unit and the bottom charging coil are connected by the bottom through-hole.

12. further comprising at least one intermediate coil layer set consisting of an intermediate dielectric layer and an intermediate charging coil; The intermediate coil layer set is disposed between the first electrode unit and the bottom coil layer set, and each intermediate coil layer set has an intermediate dielectric layer disposed above an intermediate charging coil; 12. The mutual capacitive touch screen of claim 11, wherein each of the intermediate dielectric layers has at least one intermediate through-hole, and the first electrode unit, each of the intermediate charging coils, and the bottom charging coil are connected by the intermediate through-hole and the bottom through-hole.

13. further comprising a circuit layer set consisting of a circuit dielectric layer and a first wiring; the circuit dielectric layer is disposed above the first wiring; the circuit layer set and the bottom coil layer set are adjacent to each other, and the circuit layer is disposed above the bottom coil layer; The mutual capacitance touch screen according to claim 11 or 12, wherein the first wiring is connected to at least one of the first electrode unit and the second electrode unit.

14. The bottom coil layer set further includes a second trace, the second trace being disposed on the same layer as the bottom charging coil; The mutual capacitance touch screen according to claim 13 , wherein the second wiring is connected to at least one of the first electrode unit and the second electrode unit.

15. 15. The mutual capacitance touch screen of claim 14, wherein the second electrode unit, the first dielectric layer, the first electrode unit, the middle coil layer set, and the bottom coil layer set are integrated within a same printed circuit board.

16. further comprising a cover plate; The mutual capacitance touch screen of claim 1 , wherein the cover plate is disposed on a side of the second electrode unit away from the first dielectric layer.

17. A touch control device comprising a driving chip and a mutual capacitance touch screen according to any one of claims 1 to 16, characterized in that the mutual capacitance touch screen is electrically connected to the driving chip.

18. 18. The touch control device according to claim 17, wherein the touch control device can dynamically switch the resonant circuit formed by the first electrode unit and the second electrode unit to a preset frequency point, thereby realizing transmitting energy to an external device at the same frequency point or receiving energy from an external device at the same frequency point.

19. 20. The touch control device of claim 18, wherein the first electrode unit includes a plurality of electrodes, and the touch control device can place different electrodes in the first electrode unit at different frequency points, so that the touch control device can simultaneously transmit energy to or receive energy from an external device corresponding to different frequency points.

20. The touch control device according to claim 17, wherein the mutual capacitance touch screen has the resonant circuit formed between the first electrode unit and the second electrode unit within a predetermined area.

21. 18. The touch control device of claim 17, wherein the driving chip includes a touch driving chip, a wireless control chip, and a plurality of switches, a first end of each of the switches connected to the first electrode unit, a second end connected to the touch driving chip, and a third end connected to the wireless control chip, and the first state and the second state of the first electrode unit can be switched by the switches.

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