Mutual capacitance touch screen and touch device with the same

Abstract

Embodiments of the present application provide a mutual-capacitance touch screen and a touch device having the same. The mutual-capacitance touch screen comprises: a first dielectric layer, the first dielectric layer comprising a first surface and a second surface arranged oppositely; a first electrode unit, the first electrode unit arranged on the first surface of the first dielectric layer; and a second electrode unit, the second electrode unit arranged on the second surface of the first dielectric layer and cooperated with the first electrode unit to form a coupled mutual-capacitance. The first electrode unit comprises 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 coordinates of a touch point are obtained by detecting the coupled 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.

Description

Technical Field

[0001] This application relates to the field of touch screen technology, and in particular to a mutual-capacity touch screen and a touch device having the mutual-capacity touch screen. Background Technology

[0002] With the widespread adoption of smartphones, laptops, smartwatches, and other devices, smart devices are becoming increasingly feature-rich while simultaneously requiring smaller, more compact designs. Because these two trends are contradictory, a trade-off often needs to be made between the size and functionality of smart devices.

[0003] Touchscreens, as the primary human-computer interaction method for smart devices, often occupy a large area (volume) of these devices, yet they only perform touch functions. Taking a conventional capacitive touchscreen as an example, it typically includes multiple driving and receiving electrodes to form mutual capacitance, thereby detecting the touch position. However, conventional capacitive touchscreens cannot provide electromagnetic resonance internally, thus preventing the use of existing components for energy transfer. Summary of the Invention

[0004] In view of this, it is necessary to provide a mutual capacitance touch screen and a touch device having the mutual capacitance touch screen, which can provide electromagnetic resonance to achieve the function of energy transfer while realizing the conventional touch position detection function.

[0005] The first aspect of this application provides a mutual capacitance touch screen, the mutual capacitance touch screen comprising:

[0006] A first dielectric layer, the first dielectric layer including a first surface and a second surface disposed opposite to each other;

[0007] The first electrode unit is disposed on the first surface of the first dielectric layer;

[0008] The second electrode unit is disposed on the second surface of the first dielectric layer and is disposed in conjunction with the first electrode unit to form a coupling mutual capacitance;

[0009] The first electrode unit includes 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. The coordinates of the touch point are obtained by detecting the coupling mutual capacitance between the first electrode unit and the second electrode unit.

[0010] When the first electrode unit is in the first state, the first electrode unit and the second electrode unit form a resonant circuit.

[0011] According to the first aspect of the present application, in a possible implementation, the first electrode unit includes a first end and a second end; when excitation signals are applied to both the first end and the second end, the first electrode unit is in a first state; when an excitation signal is applied to either the first end or the second end, the first electrode unit is in a second state.

[0012] According to the first aspect of the present application, in a possible implementation, when the first electrode unit is in the first state, an equivalent capacitance is formed at each overlapping portion of 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 a plurality of equivalent capacitances are connected in parallel with the equivalent inductance to constitute a resonant circuit.

[0013] According to the first aspect of the present application, in a possible implementation, the first electrode unit at least includes a first electrode and a second electrode, a switch is provided between the first electrode and the second electrode, and the first electrode and the second electrode can be connected or disconnected through the switch.

[0014] According to the first aspect of the present application, in a possible implementation, the first electrode unit extends along a certain direction around a center point and is arranged in a rectangular shape, and the second electrode unit includes a plurality of strip electrodes.

[0015] According to the first aspect of the present application, in a possible implementation, the first electrode unit is arranged in a spiral shape, and the second electrode unit includes a plurality of azimuth electrodes, and the azimuth electrodes are in a complete block shape.

[0016] According to the first aspect of the present application, in a possible implementation, the first electrode unit is arranged in a concentric circular shape, the azimuth electrodes are arranged in a fan shape and extend along the radial direction of the circumference.

[0017] According to the first aspect of the present application, in a possible implementation, the first electrode unit is arranged in a concentric circular shape, and the edge of the azimuth electrode is serrated.

[0018] According to the first aspect of the present application, in a possible implementation, a plurality of openings or slots are provided on the azimuth electrodes.

[0019] According to the first aspect of the present application, in a possible implementation, the strip electrode is an axisymmetric figure with a center line as the axis of symmetry, the shape of the strip electrode is in the shape of a "king", and the opposite sides of the strip electrode have openings, and the opening directions of a plurality of strip electrodes are the same.

[0020] According to a first aspect of this application, in one possible implementation, the mutual capacitance touch screen further includes a bottom coil layer group consisting of a bottom dielectric layer and a bottom charging coil; forming a stacked structure from top to bottom consisting of a second electrode unit, a first dielectric layer, a first electrode unit, a bottom dielectric layer and a bottom charging coil, wherein at least one bottom through hole is provided on the bottom dielectric layer, and the first electrode unit and the bottom charging coil are connected through the bottom through hole.

[0021] According to a first aspect of this application, in one possible implementation, the mutual capacitance touch screen further includes: at least one group of intermediate coil layers consisting of an intermediate dielectric layer and an intermediate charging coil; the intermediate coil layer group is disposed between the first electrode unit and the bottom coil layer group, and each intermediate coil layer group has an intermediate dielectric layer disposed above the intermediate charging coil; each intermediate dielectric layer has at least one intermediate through hole, and the first electrode unit is connected to each intermediate charging coil and the bottom charging coil through the intermediate through hole and the bottom through hole.

[0022] According to a first aspect of this application, in one possible implementation, the inter-capacitive touch screen further includes: a circuit layer group consisting of a circuit dielectric layer and a first trace, wherein the circuit dielectric layer is disposed above the first trace, the circuit layer group and the bottom coil layer group are adjacent, and the circuit layer is disposed above the bottom coil layer; the first trace connects a first electrode unit and / or a second electrode unit.

[0023] According to a first aspect of this application, in one possible implementation, the bottom coil layer group further includes a second trace, which is disposed on the same layer as the bottom charging coil; the second trace connects the first electrode unit and / or the second electrode unit.

[0024] According to a first aspect of this application, in one possible implementation, the second electrode unit, the first dielectric layer, the first electrode unit, the intermediate coil layer group, and the bottom coil layer group are integrated within the same printed circuit board.

[0025] According to a first aspect of this application, in one possible implementation, the intercapacitive touchscreen further includes a cover plate disposed on the side of the second electrode unit away from the first dielectric layer.

[0026] A second aspect of this application provides a touch device, which includes a driver chip and a mutual capacitance touch screen as described above, wherein the mutual capacitance touch screen is electrically connected to the driver chip.

[0027] According to a second aspect of this application, in one possible implementation, the touch device can dynamically switch the resonant circuit formed by the first electrode unit and the second electrode unit to a preset frequency point, so as to send or receive energy with an external device at the same frequency point.

[0028] According to a second aspect of this application, in one possible implementation, the first electrode unit includes a plurality of electrodes, and the touch device is able to set different electrodes in the first electrode unit at different frequency points, so that the touch device simultaneously sends or receives energy with external devices corresponding to different frequency points.

[0029] According to a second aspect of this application, in one possible implementation, the first electrode unit and the second electrode unit of the mutual capacitance touch screen form a resonant circuit within a set area.

[0030] According to a second aspect of this application, in one possible implementation, the driver chip includes a touch driver chip, a wireless control chip, and a plurality of switches; each switch has a first end connected to a first electrode unit, 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 can be switched by the switch.

[0031] Compared with the prior art, this application has at least the following advantages:

[0032] By arranging the first electrode unit in different configuration states—specifically, in the first state forming a resonant circuit with the second electrode unit—the mutual capacitance touchscreen can achieve frequency selection. The touch device can dynamically switch the resonant circuit formed by the first and second electrode units to a preset frequency point, thereby enabling the transmission or reception of energy with external devices at the same frequency. Furthermore, by setting different electrodes within the first electrode unit at different frequency points, the touch device can simultaneously transmit or receive energy with external devices at corresponding different frequency points, and the transmission and reception of energy by the external devices can occur simultaneously. In the second state, the first and second electrode units form a combination of driving and receiving electrodes, realizing the conventional touch position detection function. Thus, touch position detection and energy transfer are simultaneously achieved. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a mutual-capacity touch screen in one embodiment of this application.

[0034] Figure 2 for Figure 1 The diagram shows the structure of the first electrode unit in the mutual capacitance touch screen.

[0035] Figure 3 for Figure 1 The diagram shows the structure of the second electrode unit in the mutual capacitance touchscreen.

[0036] Figure 4 for Figure 1 The diagram shows the overlap of the first electrode unit and the second electrode unit in the mutual capacitance touch screen.

[0037] Figure 5 for Figure 1 The diagram shows the first electrode unit in the first state of the mutual capacitance touch screen.

[0038] Figure 6 for Figure 1 The diagram shows a parallel resonant circuit formed by the first electrode unit and the second electrode unit in the mutual capacitance touch screen.

[0039] Figure 7 for Figure 1 The diagram shows the first electrode unit in the second state of the mutual capacitance touch screen.

[0040] Figure 8 This is another structural schematic diagram of the mutual capacitive touch screen in one embodiment of this application.

[0041] Figure 9 for Figure 8 The diagram shows the structure of the first electrode unit in the mutual capacitance touch screen.

[0042] Figure 10 for Figure 8 The diagram shows the structure of the second electrode unit in the mutual capacitance touchscreen.

[0043] Figure 11 This is another structural schematic diagram of the mutual capacitive touch screen in one embodiment of this application.

[0044] Figure 12 for Figure 11 The diagram shows the structure of the second electrode unit in the mutual capacitance touchscreen.

[0045] Figure 13 This is a schematic diagram of the structure of the second electrode unit in one embodiment of this application.

[0046] Figure 14 This is another structural schematic diagram of the mutual capacitive touch screen in one embodiment of this application.

[0047] Figure 15 This is another structural schematic diagram of the mutual capacitive touch screen in one embodiment of this application.

[0048] Figure 16 This is a schematic diagram of the structure of a touch device in one embodiment of this application.

[0049] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application.

[0050] Explanation of main component symbols

[0051] Mutual capacitive touchscreens 100, 100a, 100b, 200, 200a 310

[0053] First electrode units 10, 10a, 10b, 220

[0054] First electrodes 11, 11a, 11b

[0055] Second electrodes 12, 12a, 12b

[0056] First end 101

[0057] Second end 102

[0058] Second electrode units 20, 20a, 20b, 20c, 210

[0059] strip electrode 21

[0060] Third end 103

[0061] Fourth end 104

[0062] Opening 201

[0063] 202 openings

[0064] Slotting 203

[0065] Touch area 204

[0066] Channels 205, 205a

[0067] Bottom coil layer group 240

[0068] Bottom dielectric layer 241

[0069] Bottom through hole 2411

[0070] Bottom charging coil 242

[0071] Second route 243

[0072] Line layer group 250

[0073] Line dielectric layer 251

[0074] Through-hole 2511 in the circuit layer

[0075] First route 252

[0076] Intermediate coil layer group 260

[0077] Intermediate layer 261

[0078] Through hole 2611

[0079] Intermediate charging coil 262

[0080] First dielectric layer 30, 230

[0081] Page 1, page 31

[0082] Page 2, 32

[0083] Touch device 300

[0084] Interface 311

[0085] Glass cover 320

[0086] Adhesive 330

[0087] Ferrite 340

[0088] Parallel resonant circuit 1001

[0089] Loss resistance R

[0090] Equivalent capacitance C i

[0091] Equivalent inductance L

[0092] Azimuth electrode θ i Detailed Implementation

[0093] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0094] Numerous specific details are set forth in the following description to provide a thorough understanding of the invention. The described embodiments are merely some, not all, of the embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of this invention.

[0095] 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 pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0096] Example 1:

[0097] Please see Figure 1 This 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.

[0098] It is understood that the first dielectric layer 30 can be one of film, glass, plastic, printed circuit board (PCB), or other materials, without limitation.

[0099] The first dielectric layer 30 includes a first surface 31 and a second surface 32 disposed opposite to each other. A first electrode unit 10 and a second electrode unit 20 are disposed on the two opposite surfaces of the first dielectric layer 30. For example, the first electrode unit 10 is disposed on the first surface 31, and the second electrode unit 20 is disposed on the second surface 32.

[0100] Please refer to the following: Figure 2 , Figure 2 This is a schematic diagram of the structure of the first electrode unit 10. The first electrode unit 10 extends from the inside out or from the outside in a certain direction around a certain center point and is arranged in a certain shape in the first dielectric layer 30. For example, the first electrode unit 10 extends from one end to the center point A in a counterclockwise direction from the inside out to the other end and is arranged in a rectangular shape in the first dielectric layer 30.

[0101] In one possible implementation, the first electrode unit 10 includes a first electrode 11 and a second electrode 12 connected together. 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, so that the first electrode 11 and the second electrode 12 are interconnected to form a whole. In these embodiments, the first electrode 11 extends counterclockwise from the first end 101 around the center point A to the second end 102, and is arranged in a rectangular shape in 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 continues to extend counterclockwise from the first electrode 11 and the center point A to the fourth end 104, and is arranged in a rectangular shape in the first dielectric layer 30.

[0102] In one possible implementation, a switch (not shown) is provided between the second end 102 and the third end 103, and the first electrode unit 10 can connect or disconnect the first electrode 11 and the second electrode 12 by opening and closing the switch.

[0103] It is understood that in other embodiments, the first electrode unit 10 may also include more other electrodes with structures similar to the first electrode 11 and the second electrode 12, and surround the periphery of the first electrode 11.

[0104] Please see Figure 3 , Figure 3It 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 arranged on the first dielectric layer 30 and form an array matrix, and no strip electrode is provided at the central position of the array matrix. Specifically, an XY-axis coordinate system is established as shown in Figure 3 . Each strip electrode 21 is located within a coordinate cell. No strip electrode 21 is provided in the coordinate cell at the middle position.

[0105] It can be understood that the number of strip electrodes 21 of the second electrode unit 20 and the number of coordinate cells without strip electrodes 21 can both be set as required. For example, 1, 4, or 9 coordinate cells at the middle position do not have strip electrodes 21. Taking Figure 3 as an example, Figure 3 there are a total of 7×7 = 49 coordinate cells. No strip electrodes 21 are provided in the 9 coordinate cells at the middle, that is, the second electrode unit 20 has a total of 40 strip electrodes 21.

[0106] In a possible implementation manner, each strip electrode 21 is an axisymmetric figure with a center line (not marked in the figure) as the axis of symmetry. The shape of the strip electrode 21 is, for example, in the shape of a "king" character. The opposite sides of the strip electrode 21 have openings 201. The openings 201 of the plurality of strip electrodes 21 are all arranged in the same direction, for example, arranged along the Y-axis direction in the figure.

[0107] Please refer to Figure 4 together. The figure shows a schematic diagram of the cooperation 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 (refer to Figure 1 ) overlap. Specifically, the projection of the strip electrode in the second electrode unit 20 on the first dielectric layer 30 overlaps with the projection of the first electrode 11 or the second electrode 12 in the first electrode unit 10 on the first dielectric layer 30.

[0108] Taking Figure 4 as an example, the second electrode unit 20 is provided with a total of 40 strip electrodes. The projections of the strip electrodes in the coordinate cells of the two columns where X = 1 and X = 7 are located, and the projections of the strip electrodes in the coordinate cells of the two rows where Y = 1 and Y = 7 are located on the first dielectric layer 30 all overlap with the projection of the second electrode 12 on the first dielectric layer 30, that is, a total of 24 strip electrodes are arranged in cooperation with the second electrode 12. The remaining 16 strip electrodes in the second electrode unit 20 are arranged in cooperation with the first electrode 11 in the same manner, which will not be elaborated here.

[0109] It is understood that the first electrode unit 10 and the second electrode unit 20 can form an electric field coupling, thereby forming a mutual capacitance matrix. The mutual capacitance matrix includes several coupled mutual capacitances, which are mainly concentrated at the overlap of the projections of the first electrode unit 10 and the second electrode unit 20 onto the first dielectric layer 30. In one possible implementation, a coupled mutual capacitance is formed at the overlap of each strip electrode within the second electrode unit 20 with the projection of the first electrode unit 10 onto the first dielectric layer 30.

[0110] Please refer to the following: Figure 5 and Figure 7 In this embodiment of the application, the first electrode unit 10 includes two states, namely the first state (see...). Figure 5 ) and the second state (refer to) Figure 7 For ease of description, the following explanation will take the example of the first electrode unit 10 including only the first electrode 11. It can be understood that when the first electrode unit 10 includes multiple electrodes, such as the first electrode 11 and the second electrode 12, the first electrode 11 and the second electrode 12 are equivalent to being connected in series, and the principle is the same as that described below.

[0111] Figure 5 The diagram shows 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., alternating current 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 also 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 fed to one end of the first electrode unit 10 and a positive excitation signal is fed to the other end, the first electrode unit 10 forms a current loop.

[0112] As can be understood, as described above, when opposite excitation signals are fed into the two ends of the first electrode 11 (e.g., the first end 101 and the second end 102) and a current loop is formed, if the strip electrodes in the same column of the second electrode unit 20 are connected together, the first electrode unit 10 and the second electrode unit 20 will be equivalent to a parallel resonant circuit.

[0113] Specifically, please refer to the following: Figure 6 , Figure 6 This is a schematic diagram of a parallel resonant circuit 1001 composed of the first electrode unit 10 and the second electrode unit 20. The parallel resonant circuit 1001 includes several equivalent capacitances C1 to C2 connected in parallel. i Equivalent inductance L and loss resistance R. For example... Figure 6As shown, all equivalent capacitances C1 to C i One end of the equivalent inductance L and one end of the loss resistor R are all connected to the excitation voltage V+, and all equivalent capacitances C1 to C2 are connected to the excitation voltage V+. i The other end of the circuit, the other end of the equivalent inductance L, and the other end of the loss resistor R are all connected to the excitation voltage V-.

[0114] It can be understood that the mutual capacitance formed by the first electrode 11 and the strip electrode of the second electrode unit 20 (for example, the second electrode unit 20 and the first electrode 11 are connected in parallel) constitutes the corresponding equivalent capacitance. Figure 6 For example, since the second electrode unit 20 has 16 strip electrodes that cooperate with the first electrode 11, the first electrode 11 and the strip electrodes of the second electrode unit 20 cooperate to form 16 equivalent capacitors. That is to say, with appropriate configuration, the parallel resonant circuit 1001 has a total of 16 equivalent capacitors in parallel, i.e., i = 16.

[0115] Furthermore, as described above, when opposite excitation signals are fed into the two ends of the first electrode 11 (e.g., the first end 101 and the second end 102) and a current loop is formed, that is, when the first electrode unit 10 is in the first state, the first electrode unit 10 is equivalent to a current-carrying helix, and a magnetic field will be generated around it. The direction of the magnetic field of the current-carrying helix satisfies the "right-hand screw 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 is equivalent to an equivalent inductance L in the parallel resonant circuit 1001. In one possible implementation, 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).

[0116] Specifically, the value of the equivalent inductance L can be obtained from formula (1), in units of Henry (H):

[0117]

[0118] Where l is the length of the coil (e.g., the first electrode unit 10) in meters, k is the Nagaoka coefficient, k = 2R / l, where R is the radius, and μ0 is the free permeability, μ0 = 4π × 10⁻⁶. -7 μ S S is the relative permeability of the magnetic core inside 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.

[0119] It is understood that when the first electrode unit 10 includes a first electrode 11 and a second electrode 12, the first electrode 11 and the second electrode 22 are essentially connected in series. In this way, the parallel resonant circuit 1001 can obtain a larger equivalent inductance L value. The loss resistance R of the parallel resonant circuit 1001 is affected by factors such as the shape, material, and dielectric of the first electrode 11 and the strip electrode.

[0120] It is understandable that the parallel resonant circuit 1001 has a corresponding resonant frequency, and its resonant frequency is... Where C ∑ =C1+C2+…+C i .

[0121] The 3dB bandwidth BW of the parallel resonant circuit 1001 3dB =ω0 / Q, where Q is the quality factor of the parallel resonant circuit 1001. The rectangular coefficient BW of the parallel resonant circuit 1001. 0.1 =10×BW 3dB .

[0122] It is understood that by configuring the first electrode unit 10 in a first state and forming a parallel resonant circuit 1001 with the second electrode unit 20, the mutual capacitance touch screen 100 has a corresponding frequency selection function, enabling energy transfer within a specific range. By adjusting relevant parameters, such as the shape and material of the first electrode unit 10 and the second electrode unit 20, energy within the passband can be transferred, while energy outside the passband can be effectively suppressed.

[0123] Please refer to it again. Figure 3 and Figure 4 It should be noted that in some embodiments, when the first electrode unit 10 is in the first state, if the strip electrodes in the same row of the second electrode unit 20 are connected together, for example, the strip electrodes 21 in the coordinate cells of rows Y=1 and Y=7 are connected together, then the first electrode unit 10 and the second electrode unit 20 will also be 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 may not be connected together, but only the mutual capacitance formed by the first electrode unit 10 and the second electrode unit 20 needs to be arranged in an array matrix. It can be understood that in these partial embodiments, the value of the equivalent inductance L cannot be obtained by applying formula (1) in the above embodiments.

[0124] It is understandable that when an excitation signal is fed into the first electrode unit 10 (e.g., the first electrode 11) but no current loop is formed, the first electrode unit 10 is in the second state, and its magnetic field effect will disappear. For details, please refer again. Figure 7The diagram shows the first electrode unit 10 in its second state. When the first electrode unit 10 is in the second state, an excitation signal is applied to either its first terminal 101 or its second terminal 102. For example, an excitation voltage V+ is applied only to the first terminal 101, while the second terminal 102 is left floating. In this case, the first electrode unit 10 and the second electrode unit 20 only form a mutual capacitance matrix.

[0125] It is understood that when the first electrode unit 10 and the second electrode unit 20 form a mutual capacitance matrix, the first electrode unit 10 serves as a touch driving electrode, and the second electrode unit 20 can serve as a touch receiving electrode. Alternatively, the second electrode unit 20 can serve as a touch driving electrode, and the first electrode unit 10 can serve as a touch receiving electrode. That is, in this embodiment, the first electrode unit 10 and the second electrode unit 20 constitute a combination of driving electrode and receiving electrode, and the touch point coordinates are 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.

[0126] Example 2:

[0127] Please see Figures 8 to 10 Another mutually compatible touchscreen 100a provided in this application embodiment (see reference) Figure 8 ).like Figures 8 to 10 As shown, the structure of the mutual capacitance touch screen 100a is similar to that of the mutual capacitance touch screen 100. The difference is 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.

[0128] like Figure 9 As shown, in Embodiment 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 one possible implementation, the first electrode unit 10a extends counterclockwise from the inside out around a center point (e.g., point B) and is arranged in a concentric circle shape in the first dielectric layer 30 (see Figure 1). Figure 1 It can be understood that concentric circles are a special case of planar spiral shapes. Planar spiral shapes can also include ellipses, etc.

[0129] like Figure 10 As shown, the second electrode unit 20a includes several azimuth electrodes θ i The number of these electrodes can be set as needed, for example, six. Azimuth electrode θ i The shape is a complete block. In one specific embodiment, the azimuth electrode θ i Its specific shape is roughly fan-shaped, extending from the geometric center point of the first electrode unit 10a along the radial direction of the circumference.

[0130] In one possible implementation, when the first electrode unit 10a is in the second state, that is, when the first electrode unit 10a and the second electrode unit 20a only provide touch functionality, the orientation electrode θ is set. i The touch position can be indicated using polar coordinates. Specifically, the distance from any point on the first electrode unit 10a to the center point B is used to represent the radius of the polar coordinates, and the orientation electrode θ of the second electrode unit 20a is used to represent the radius of the polar coordinates. i The azimuth angle used to represent polar coordinates.

[0131] It is understandable that when an excitation signal is applied to both ends of the first electrode unit 10a, which consists of the first electrode 11a and the second electrode 12a, and a circuit is formed, an inductance is also formed and a magnetic field effect is generated. Then, energy of a specific frequency is transmitted by forming a parallel resonant circuit with the second electrode unit 20a.

[0132] Example 3:

[0133] Please see Figures 11 to 12 Another type of intercompatible touchscreen 100b provided in this application embodiment (see reference) Figure 11 ).like Figures 11 to 12 As shown, the structure of the mutual capacitance touch screen 100b is similar to that of the mutual capacitance 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.

[0134] Specifically, the orientation electrode θ of the second electrode unit 20b i Its shape remains a complete block. However, the azimuth electrode θ i The edges are serrated.

[0135] Please compare and refer to the following: Figure 10 and Figure 12 When the azimuth electrode θ i The edges are set as follows Figure 10 When the line shape is as shown, the adjacent electrodes θ i A roughly straight channel 205 is provided between them. Taking the azimuth electrode θ6 as an example, if a finger touches the area corresponding to the azimuth electrode θ6 to form a... Figure 10 When the touch area 204 is shown, it is located in the middle of the azimuth electrode θ6. At this time, the touch area 204 is far away from the adjacent electrodes θ5 and θ6, and the touch sensing amount is small. However, when the azimuth electrode θ6 is moved to the center, the touch area 204 is far away from the adjacent electrodes θ5 and θ6. i Edge settings such as Figure 12 When the serrated shape is shown, if you place your finger on it... Figure 10 Touch areas 204 of the same size are formed at the same location. Due to the tortuous nature of the adjacent channels 205a, the touch area 204 will also partially cover electrodes θ5 and θ6. Thus, the amount of touch sensing will increase accordingly. It can be understood that when the amount of touch sensing increases, the accuracy of calculating the touch position (e.g., angle) will also increase accordingly, i.e., by adjusting the orientation electrode θ... i Setting it to a sawtooth pattern can reduce the error in angle detection.

[0136] Example 4:

[0137] Please see Figure 13 This is another type of intercompatible touchscreen provided in the embodiments of this application (not shown in the figure). Figure 13 As shown, 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.

[0138] Specifically, the orientation electrode θ of the second electrode unit 20c i The surface has several openings 202 and slots 203.

[0139] It is understandable that by setting the opening 202 and the slot 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, thereby adjusting the energy transmission efficiency and frequency range.

[0140] Example 5:

[0141] Please see Figure 14 The embodiments of this application also provide 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 group 240.

[0142] The second electrode unit 210 can serve as a receiving electrode, and can be the second electrode unit 20 / 20a / 20b / 20c described in the above embodiments. The first electrode unit 220 can serve as a transmitting electrode, and can be the first electrode unit 10 / 10a / 10b described in the above embodiments. The first dielectric layer 231 can be the first dielectric layer 30 described in the above embodiments. The second dielectric layer 232 can be made of the same material as the first dielectric layer 231.

[0143] The second electrode unit 210 is disposed opposite to the first electrode unit 220 on both sides of the first dielectric layer 230. The bottom coil layer group 240 is located on one side of the first electrode unit 220.

[0144] In this embodiment, the bottom coil layer group 240 is composed of a bottom dielectric layer 241 and a bottom charging coil 242. Thus, the mutual capacitance touchscreen 200 is configured with a stacked structure along the X-axis from top to bottom: a second electrode unit 210, a first dielectric layer 230, a second electrode unit 210, a bottom dielectric layer 241, and a bottom charging coil 242. It can be understood that the bottom charging coil 242 is a wireless charging coil.

[0145] At least one bottom through-hole 2411 is formed on the bottom dielectric layer 241. The first electrode unit 220 is connected to the bottom charging coil 242, and the connection point is located within the bottom through-hole 2411. That is, the first electrode unit 220 and the bottom charging coil 242 are connected through the bottom through-hole 2411. It can be understood that the first electrode unit 220 can be reused as a charging coil. In this way, the first electrode unit 220 and the bottom charging coil 242 can form a charging coil combination. By setting different electrodes in the first electrode unit 220 at different frequency points, the touch device can simultaneously send or receive energy with external devices at corresponding different frequency points, and the external device can send and receive energy simultaneously.

[0146] In one possible implementation, the inter-capacitive touchscreen 200 further includes a circuit layer group 250. The circuit layer group 250 is located between the first electrode unit 220 and the bottom coil layer group 240. The circuit layer group 250 includes a circuit dielectric layer 251 and a first trace 252, with the circuit dielectric layer 251 disposed above the first trace 252 (i.e., on the side closer to the first electrode unit 220). The first trace 252 connects the first electrode unit 220 and / or the second electrode unit 210 (connection relationship not shown in the figure).

[0147] In this embodiment, at least one via 2511 is provided on the dielectric layer 251, and the via 2511 corresponds to and is connected to the bottom via 2411. Thus, the first electrode unit 220 and the bottom charging coil 242 can be connected within the via 2511 and the bottom via 2411. It is understood that the via 2511 and the bottom via 2411 can bypass the first trace 252 of the circuit layer group 250.

[0148] In one possible implementation, the bottom coil layer group 240 further includes a second trace 243. The second trace 243 is disposed on the same layer as the bottom charging coil 242. That is, both the second trace 243 and the bottom charging coil 242 are located on the side of the bottom dielectric layer 241 away from the second electrode unit 210. The second trace 243 is connected to the first electrode unit 220 and / or the second electrode unit 210.

[0149] It is understood that the first electrode unit 220 or the second electrode unit 210 will selectively connect to the first trace 252 or the second trace 243 based on the distance of the traces. For example, if the trace distance is shorter when connecting through the first trace 252, then the first trace 252 will be connected; if the trace distance is shorter when connecting through the second trace 243, then the second trace 243 will be connected.

[0150] It is understandable that the two-layer setting of the charging coil, that is, the charging coil is divided into two layers: the first electrode unit 220 and the bottom charging coil 242, can reduce the overall impedance of the charging coil compared to the single-layer setting (that is, only the first electrode unit 220 is set), thereby reducing the energy loss of the charging coil itself and improving the output efficiency.

[0151] Furthermore, since the metal layer of the first electrode unit 220 is relatively thin and has weak heat dissipation capacity, the two-layer arrangement allows the heat from the inner first electrode unit 220 to be transferred to the bottom charging coil 242 at the bottom layer through the connection in the bottom through-hole 2411, and then released through the bottom charging coil 242. This enables rapid heat release from the device, thereby reducing the temperature of the electronic device and effectively extending its lifespan.

[0152] In one possible implementation, the inter-capacitive touchscreen 200a also includes a cover plate, which allows the user to perform touch operations by touching it. It is understood that the material of the cover plate is not limited here; for example, it can be a glass plate, Mylar plate, film, etc.

[0153] Example 6:

[0154] Please see Figure 15 The embodiments of this application also provide a mutual capacitance touch screen 200a. The mutual capacitance touch screen 200a has a similar structure to the mutual capacitance touch screen 200, the difference being that the mutual capacitance touch screen 200a further includes at least one intermediate coil layer group 260. The intermediate coil layer group 260 is located between the first electrode unit 220 and the bottom coil layer group 240.

[0155] The intermediate coil layer group 260 includes an intermediate dielectric layer 261 and an intermediate charging coil 262. The intermediate dielectric layer 261 in each intermediate coil layer group 260 is located above the intermediate charging coil 262 (i.e., on the side closer to the first electrode unit 220).

[0156] Each intermediate dielectric layer 261 has at least one intermediate through hole 2611. The first electrode unit 220 is connected to the intermediate charging coil 262, and the connection is located inside the intermediate through hole 2611. That is, the first electrode unit 220 is connected to each intermediate charging coil 262 through the intermediate through hole 2611.

[0157] In one possible implementation, the first electrode unit 220 is sequentially connected to the intermediate charging coil 262 and the bottom charging coil 242. Specifically, the first electrode unit 220 is connected to the intermediate charging coil 262 through an intermediate through-hole 2611, and the intermediate charging coil 262 is connected to the bottom charging coil 242 through a bottom through-hole 2411. That is, the first electrode unit 220 is connected to each of the intermediate charging coils 262 and the bottom charging coil 242 through the intermediate through-holes 2611 and the bottom through-holes 2411.

[0158] It is understandable that the number of intermediate coil layer groups 260 is not limited here; there can be one or two (e.g., ...). Figure 15 (as shown) or multiple intermediate coil layer groups 260. When there is more than one intermediate coil layer group 260, the intermediate charging coils 262 of adjacent intermediate coil layer groups 260 are connected through the intermediate through-hole 2611 of the intermediate dielectric layer 261 located in the lower layer (i.e., the bottom coil layer group 240).

[0159] In one possible implementation, in this embodiment, the circuit layer group 250 and the bottom coil layer group 240 are arranged adjacent to each other. Thus, the intercapacitive touch screen 200a forms a stacked structure from top to bottom: second electrode unit 210, first dielectric layer 230, first electrode unit 220, intermediate coil layer group 260, circuit dielectric layer 251, first trace 252, bottom dielectric layer 241 and bottom charging coil 242.

[0160] It is understood that regardless of how many intermediate coil layers 260 the mutual capacitance touch screen 200a has, a bottom charging coil 242 is always provided at the bottom layer of the mutual capacitance touch screen 200a. In this way, the heat generated by the charging coils located in the inner layers (such as the first electrode unit 220 and the intermediate charging coils 262) can be transferred from the inside to the outside to the bottom charging coil 242 located in the outermost layer, and the heat is released through the bottom charging coil 242.

[0161] Example 7:

[0162] Please refer to the following: Figure 16 The embodiments of this application also provide a touch device 300. The touch device 300 includes a driver chip and a mutual capacitance touch screen 310, which can be the mutual capacitance touch screen 100 / 100a / 100b / 200 / 200a in the above embodiments.

[0163] The mutual capacitance touch screen 310 is electrically connected to the driver chip via a connecting wire. This connecting wire may include, for example, the first trace 252 and the second trace 243 described in embodiments 5 or 6 above.

[0164] In one possible implementation, the mutual capacitance touchscreen 310 of the touch device 300 has a defined area where the first electrode unit 10 / 10a / 10b / 220 and the second electrode unit 20 / 20a / 20b / 20c / 210 can form a resonant circuit. That is, not all electrode units (e.g., the first electrode unit 10 / 10a / 10b / 220) can be reused as a charging coil. For example, the mutual capacitance touchscreen 310 can be divided into an upper half and a lower half; only the electrode unit located in either the upper or lower half can be reused as a charging coil.

[0165] In one possible implementation, the driver chip includes a touch driver chip, a wireless control chip, and several switches. Each switch has a first terminal connected to a first electrode unit 10 / 10a / 10b / 220, a second terminal connected to the touch driver chip, and a third terminal connected to the wireless control chip. The first and second states of the first electrode unit 10 / 10a / 10b / 220 can be switched via the switches.

[0166] In one possible implementation, the second electrode unit 210, the first dielectric layer 230, the first electrode unit 220, the intermediate coil layer group 260, the circuit layer group 250, and the bottom coil layer group 240 are all integrated into a printed circuit board (PCB). The touch device 300 includes several components, including the aforementioned driver chip, as well as components such as resistors and capacitors. These components are disposed on the back side of the aforementioned printed circuit board.

[0167] It is understood that the mutual capacitance touch screen 310 collects touch information through the coupling signal between the first electrode unit and the second electrode unit, thereby realizing the touch position detection function.

[0168] It is understandable that the touch device may be circular, near-circular, square, or square with rounded corners.

[0169] In one possible implementation, the touch device 300 also includes a glass cover 320, an adhesive backing 330, and a ferrite core 340.

[0170] Adhesive 330 is disposed between the glass cover plate 320 and the mutual capacitance touch screen 310 to bond the glass cover plate 320 and the mutual capacitance touch screen 310 together. Ferrite 340 is located on the side of the mutual capacitance touch screen 310 away from the glass cover plate 320.

[0171] It is understandable that the inter-capacitive touch screen 310 is also equipped with an interface 311. One end of the interface 311 is connected to the wiring on the inter-capacitive touch screen 310, and the other end is used to connect to the motherboard of the electronic device.

[0172] Example 8:

[0173] Embodiments of this application also provide an electronic device. This electronic device includes the touch device described in the above embodiments. The electronic device may be, but is not limited to, a smartphone, tablet, watch, earphones, laptop, etc.

[0174] Obviously, this application enables the mutual capacitance touchscreen 100 / 100a / 100b / 200a to achieve frequency selection by placing the first electrode units 10 / 10a / 10b / 220 in different configuration states. In the first state, they form a resonant circuit with the second electrode units 20 / 20a / 20b / 20c / 210. The touch device within the electronic device can dynamically switch the resonant circuit formed by the first electrode units 10 / 10a / 10b / 220 and the second electrode units 20 / 20a / 20b / 20c / 210 to a preset frequency point, thereby enabling the transmission or reception of energy with an external device at the same frequency. Furthermore, the first electrode units 10 / 10a / 10b / 220 are provided with several electrodes (e.g., the first electrode and the second electrode). By setting different electrodes at different frequency points, the touch device can simultaneously transmit or receive energy with external devices at corresponding different frequency points, and the transmission and reception of energy by the external device can occur simultaneously. In the second state, it forms a combination of driving electrode and receiving electrode with the second electrode unit 20 / 20a / 20b / 20c / 210, realizing the conventional touch position detection function. Thus, it simultaneously achieves the touch position detection function and the energy transfer function.

[0175] When the first electrode unit 10 / 10a / 10b / 220 is in the first state, this application can realize wireless charging, near-field communication, and multiple communication functions such as amplitude modulation (AM), frequency modulation (FM), wireless intercom, Bluetooth, and WIFI.

[0176] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. As long as they are within the essential spirit and scope of this application, appropriate changes and variations made to the above embodiments should fall within the scope of protection claimed in this application.

Claims

1. A mutual-capacitance touchscreen, characterized in that, The mutual capacitance touch screen includes: A first dielectric layer, the first dielectric layer including a first surface and a second surface arranged opposite to each other; A first electrode unit, the first electrode unit being provided on the first surface of the first dielectric layer; A second electrode unit, the second electrode unit being provided on the second surface of the first dielectric layer and being arranged in cooperation with the first electrode unit to form a coupled mutual capacitance; Wherein, the first electrode unit includes 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 coordinates of a touch point are obtained by detecting the coupled 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; When the first electrode unit is in the first state, an equivalent capacitance is formed at each overlapping portion of 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 a plurality of the equivalent capacitances are connected in parallel with the equivalent inductance to form the resonant circuit.

2. The mutual-capacitance touchscreen as described in claim 1, characterized in that, The first electrode unit includes a first end and a second end; when excitation signals are applied to both the first end and the second end, the first electrode unit is in the first state; when an excitation signal is applied to either the first end or the second end, the first electrode unit is in the second state.

3. The mutual-capacitance touchscreen as described in claim 1, characterized in that, The first electrode unit at least includes a first electrode and a second electrode, a switch is provided between the first electrode and the second electrode, and the first electrode and the second electrode can be connected or disconnected through the switch.

4. The mutual-capacitance touchscreen as described in claim 1, characterized in that, The first electrode unit extends along a certain direction around a center point and is arranged in a rectangular shape, and the second electrode unit includes a plurality of strip electrodes.

5. The mutual-capacitance touchscreen as described in claim 1, characterized in that, The first electrode unit is arranged in a spiral shape, and the second electrode unit includes a plurality of azimuth electrodes, and the azimuth electrodes are in a complete block shape.

6. The mutual-capacitance touchscreen as described in claim 5, characterized in that, The first electrode unit is arranged in a concentric circular shape, the azimuth electrodes are arranged in a fan shape and extend along the radial direction of the circumference.

7. The mutual-capacitance touchscreen as described in claim 5 or 6, characterized in that, The first electrode unit is arranged in a concentric circular shape, and the edge of the azimuth electrode is serrated.

8. The mutual-capacitance touchscreen as described in claim 5, characterized in that, A plurality of openings or slots are provided on the azimuth electrode.

9. The mutual-capacitance touchscreen as described in claim 4, characterized in that, The strip electrode is an axisymmetric figure with a center line as the axis of symmetry, the shape of the strip electrode is in the shape of a "king", and openings are provided on opposite sides of the strip electrode, and the opening directions of a plurality of the strip electrodes are the same.

10. The mutual-capacitance touchscreen as described in claim 1, characterized in that, The mutual capacitance touch screen further includes a bottom coil layer group composed of a bottom dielectric layer and a bottom charging coil; A stacked structure is formed in which, from top to bottom, are the second electrode unit, the first dielectric layer, the first electrode unit, the bottom dielectric layer, and the bottom charging coil, At least one bottom through hole is provided on the bottom dielectric layer, and the first electrode unit and the bottom charging coil are connected through the bottom through hole.

11. The mutual-capacitance touchscreen as described in claim 10, characterized in that, The mutual capacitance touch screen further includes: at least one group of intermediate coil layer groups composed of an intermediate dielectric layer and an intermediate charging coil; The intermediate coil layer group is disposed between the first electrode unit and the bottom coil layer group, and each intermediate coil layer group consists of an intermediate dielectric layer disposed above the intermediate charging coil. Each of the intermediate dielectric layers has at least one intermediate through hole, and the first electrode unit is connected to each of the intermediate charging coils and the bottom charging coil through the intermediate through hole and the bottom through hole.

12. The mutual-capacitance touchscreen as described in claim 11, characterized in that, The inter-capacitive touchscreen further includes: a circuit layer group consisting of a circuit dielectric layer and a first trace, wherein the circuit dielectric layer is disposed above the first trace. The circuit layer group and the bottom coil layer group are adjacent, and the circuit layer is disposed above the bottom coil layer; The first trace connects the first electrode unit and / or the second electrode unit.

13. The mutual-capacitance touchscreen as described in claim 12, characterized in that, The bottom coil layer group also includes a second trace, which is disposed on the same layer as the bottom charging coil; The second trace connects the first electrode unit and / or the second electrode unit.

14. The mutual-capacitance touchscreen as described in claim 13, characterized in that, The second electrode unit, the first dielectric layer, the first electrode unit, the intermediate coil layer group, and the bottom coil layer group are integrated in the same printed circuit board.

15. The mutual-capacitance touchscreen as described in claim 1, characterized in that, The mutual capacitance touch screen also includes a cover plate, which is disposed on the side of the second electrode unit away from the first dielectric layer.

16. A touch device, characterized in that, The touch device includes a driver chip and a mutual capacitive touch screen as described in any one of claims 1 to 15, wherein the mutual capacitive touch screen is electrically connected to the driver chip.

17. The touch device as claimed in claim 16, characterized in that, The touch device can dynamically switch the resonant circuit formed by the first electrode unit and the second electrode unit to a preset frequency point, so as to send or receive energy with an external device at the same frequency point.

18. The touch device as claimed in claim 17, characterized in that, The first electrode unit includes a plurality of electrodes, and the touch device can set different electrodes in the first electrode unit at different frequency points, so that the touch device can simultaneously send energy or receive energy with external devices at corresponding different frequency points.

19. The touch device as claimed in claim 16, characterized in that, The first electrode unit and the second electrode unit in the set area of ​​the mutual capacitance touch screen constitute the resonant circuit.

20. The touch device as claimed in claim 16, characterized in that, The driving chip includes a touch driving chip, a wireless control chip, and several switching switches; the first end of each switching switch is connected to the first electrode unit, the second end is connected to the touch driving chip, and the 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 switch.

Images