A capacitive touch screen, a touch device, a smart blackboard sub-screen and a smart blackboard

Abstract

This invention provides a capacitive touchscreen, a touch device, a smart blackboard sub-screen, and a smart blackboard. The capacitive touchscreen may include: a first insulating substrate; a touch layer disposed on a first side of the first insulating substrate; a first capacitor plate disposed on a second side of the first insulating substrate, the first side and the second side being opposite sides of the first insulating substrate; the first capacitor plate having a first concave-convex structure; an insulating support body including a first end and a second end; the first end being fixedly connected to the first capacitor plate; a second insulating substrate fixedly connected to the second end; a second capacitor plate disposed on the second insulating substrate; the second capacitor plate having a second concave-convex structure, the first concave-convex structure and the second concave-convex structure being disposed opposite each other, and the gap between the first concave-convex structure and the second concave-convex structure forming a sensing capacitor. This invention improves the accuracy and completeness of chalk writing trajectory information extraction, greatly enhancing user experience and satisfaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smart blackboard, more specifically, the present application can provide a capacitive touch screen, a touch device, a smart blackboard secondary screen and a smart blackboard. BACKGROUND

[0002] At present, the smart blackboard used for education has the function of writing with chalk on the blackboard secondary screen and transmitting the writing traces on the blackboard secondary screen to the smart blackboard main screen in real time for display. Among them, the solutions to achieve the above function mainly include the following two kinds.

[0003] In combination Figure 1 As shown in the figure, the smart blackboard includes a main screen 10 and a first secondary screen 20 and a second secondary screen 30 respectively arranged on the left and right sides of the main screen 10. The first solution is to realize the above function based on infrared recognition mode, for example, through the first infrared touch frame 21 and the second infrared touch frame 22 respectively arranged on the upper side and the lower side of the first secondary screen 20 in the first secondary screen 20 in the Figure 1 , the trajectory information written on the first secondary screen 20 is collected, and then the writing traces can be transferred to the main screen 10 in real time. In combination Figure 2 As shown in the figure, the smart blackboard includes a main screen 10 and a first secondary screen 20 and a second secondary screen 30 respectively arranged on the left and right sides of the main screen 10. The second solution is to realize the above function based on image acquisition mode, for example, through the first camera 23, the second camera 24, the third camera 25 and the fourth camera 26 respectively arranged at the four corners of the first secondary screen 20 in the first secondary screen 20 in the Figure 2 , the trajectory information of the first secondary screen 20 is collected, and then the writing traces can be transferred to the main screen 10 in real time. In combination Figure 2 As shown in the figure, the smart blackboard includes a main screen 10 and a first secondary screen 20 and a second secondary screen 30 respectively arranged on the left and right sides of the main screen 10. The second solution is to realize the above function based on image acquisition mode, for example, through the first camera 23, the second camera 24, the third camera 25 and the fourth camera 26 respectively arranged at the four corners of the first secondary screen 20 in the first secondary screen 20 in the Figure 2 , the trajectory information of the first secondary screen 20 is collected, and then the writing traces can be transferred to the main screen 10 in real time. In combination

[0004] However, the first solution and the second solution as above are based on optical principle to realize, once other objects block light or writing position in the dead angle position outside the optical detection range, the writing traces displayed on the smart blackboard main screen are incomplete or distorted, etc. SUMMARY

[0005] To address the issues of incomplete or distorted handwriting displayed on the main screen of a smart blackboard in existing technologies, this invention provides a capacitive touchscreen, a touch device, a secondary smart blackboard screen, and a smart blackboard, thereby achieving technical objectives such as ensuring the integrity of handwriting displayed on the main screen and improving handwriting clarity.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a capacitive touchscreen, comprising: a first insulating substrate; a touch layer disposed on a first side of the first insulating substrate; a first capacitor plate disposed on a second side of the first insulating substrate, the first side and the second side being opposite sides of the first insulating substrate; the first capacitor plate having a first concave-convex structure; an insulating support including a first end and a second end; the first end being fixedly connected to the first capacitor plate; a second insulating substrate fixedly connected to the second end; a second capacitor plate disposed on the second insulating substrate; the second capacitor plate having a second concave-convex structure, the first concave-convex structure and the second concave-convex structure being disposed opposite to each other, and the gap between the first concave-convex structure and the second concave-convex structure forming a sensing capacitor.

[0007] To achieve the above-mentioned technical objectives, the present invention may also provide a touch device, including the capacitive touch screen in any embodiment of the present invention.

[0008] To achieve the above-mentioned technical objectives, the present invention can also provide a smart blackboard sub-screen, including a capacitive touch screen or a touch device in any embodiment of the present invention.

[0009] To achieve the above-mentioned technical objectives, the present invention can also provide a smart blackboard, including a smart blackboard main screen and a smart blackboard sub-screen in any embodiment of the present invention.

[0010] The beneficial effects of this invention include: based on the sensing capacitance formed by the gap between the first concave-convex structure on the first capacitor plate and the second concave-convex structure on the second capacitor plate, the pressing action generated when using chalk changes the gap between the first and second concave-convex structures. This allows the sensing capacitance between the first and second concave-convex structures to change in real time while writing on the touch layer of the capacitive touchscreen. The change in sensing capacitance characterizes the chalk writing. It is evident that this invention overturns the related technology's scheme of achieving chalk writing recognition based on optical principles. It can collect chalk writing trajectory information at any position on the capacitive touchscreen and is not affected by light obstruction. This invention improves the accuracy and completeness of chalk writing trajectory information extraction. When used as a secondary screen for a smart blackboard, the writing is displayed on the main blackboard screen based on the extracted chalk writing trajectory information. This invention can effectively ensure the integrity of the writing displayed on the main screen of the smart blackboard and significantly improve the clarity of the writing displayed on the main screen of the smart blackboard, greatly enhancing the user experience and satisfaction. Attached Figure Description

[0011] Figure 1 The diagram illustrates a smart blackboard in which the secondary screen of the smart blackboard recognizes the written content through an infrared touch frame.

[0012] Figure 2 The illustration shows a smart blackboard in which the secondary screen of the smart blackboard recognizes the written content by shooting with a camera.

[0013] Figure 3 A schematic diagram of a cross-section of a capacitive touchscreen in one or more embodiments of the present invention is shown.

[0014] Figure 4 A schematic diagram of a cross-section of a capacitive touchscreen when writing with chalk is shown in one or more embodiments of the present invention.

[0015] Figure 5 This diagram illustrates a positional relationship between a first capacitor plate and a second capacitor plate according to one or more embodiments of the present invention.

[0016] Figure 6 A three-dimensional structural schematic diagram of a first capacitor plate according to one or more embodiments of the present invention is shown.

[0017] Figure 7 A three-dimensional structural schematic diagram of a second capacitor plate according to one or more embodiments of the present invention is shown.

[0018] Figure 8 This invention illustrates another structural schematic diagram of the cross-section of a capacitive touchscreen when there is no touch, according to one or more embodiments of the present invention.

[0019] Figure 9 This invention illustrates another structural schematic diagram of a capacitive touchscreen cross-section when writing with chalk in one or more embodiments of the present invention.

[0020] Figure 10 This diagram illustrates another positional relationship between the first capacitor plate and the second capacitor plate according to one or more embodiments of the present invention.

[0021] Figure 11 This diagram illustrates another three-dimensional structural schematic of the first capacitor plate according to one or more embodiments of the present invention.

[0022] Figure 12 This diagram illustrates another three-dimensional structure of the second capacitor plate according to one or more embodiments of the present invention.

[0023] Figure 13 This invention illustrates another structural schematic diagram of a capacitive touchscreen cross-section without touch, according to one or more embodiments of the present invention.

[0024] Figure 14This invention illustrates another structural schematic diagram of a capacitive touchscreen cross-section when writing with chalk in one or more embodiments of the present invention.

[0025] Figure 15 A schematic diagram showing another positional relationship between the first capacitor plate and the second capacitor plate in one or more embodiments of the present invention is shown.

[0026] Figure 16 A three-dimensional structural schematic diagram of the first capacitor plate according to one or more embodiments of the present invention is shown.

[0027] Figure 17 A three-dimensional structural schematic diagram of the second capacitor plate according to one or more embodiments of the present invention is shown.

[0028] Figure 18 This invention illustrates another structural schematic diagram of a capacitive touchscreen cross-section without touch, according to one or more embodiments of the present invention.

[0029] Figure 19 This invention illustrates another structural schematic diagram of a capacitive touchscreen cross-section when writing with chalk, according to one or more embodiments of the present invention.

[0030] Figure 20 This diagram illustrates another positional relationship between the first capacitor plate and the second capacitor plate in one or more embodiments of the present invention.

[0031] Figure 21 A three-dimensional structural schematic diagram of the first capacitor plate in one or more embodiments of the present invention is shown.

[0032] Figure 22 A three-dimensional structural schematic diagram of the second capacitor plate in one or more embodiments of the present invention is shown.

[0033] Figure 23 A schematic diagram of a smart blackboard structure according to one or more embodiments of the present invention is shown.

[0034] In the picture,

[0035] 10. Main screen; 20. First secondary screen; 30. Second secondary screen; 21. First infrared touch frame; 22. Second infrared touch frame; 31. Third infrared touch frame; 32. Fourth infrared touch frame; 23. First camera; 24. Second camera; 25. Third camera; 26. Fourth camera; 33. Fifth camera; 34. Sixth camera; 35. Seventh camera; 36. Eighth camera.

[0036] 100, First capacitor plate; 200, Second capacitor plate; 300, First insulating substrate; 400, Touch layer; 500, Second insulating substrate; 600, Insulating support; 700, Chalk.

[0037] 110. First sub-electrode plate; 111. First protrusion.

[0038] 210. Second sub-electrode plate; 211. First recessed portion; 212. Side groove portion. Detailed Implementation

[0039] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0040] The accompanying drawings illustrate various structural schematics according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may be omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed. In the context of the embodiments of the present invention, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element, or there may be an intermediate layer / element between them. Additionally, if a layer / element is "on" another layer / element in one orientation, then when the orientation is reversed, the layer / element may be "below" the other layer / element.

[0041] like Figure 3 As shown, one or more embodiments of the present invention can provide a capacitive touch screen, which may include, but is not limited to, a first capacitor plate 100, a second capacitor plate 200, a first insulating substrate 300, a touch layer 400, a second insulating substrate 500, and an insulating support 600.

[0042] The first insulating substrate 300 is made of insulating material; the first insulating substrate 300 is used to support and fix the first capacitor plate 100.

[0043] A touch layer 400 is disposed on a first side of the first insulating substrate 300. The first side can be, for example, the upper side, meaning the touch layer 400 is disposed on the upper side of the first insulating substrate 300. In this embodiment, the touch layer 400 and the first insulating substrate 300 will deform under stress. When this embodiment is applied to a smart blackboard sub-screen, the touch layer 400 serves as the writing touch surface of the sub-screen, and both the first capacitor plate 100 and the second capacitor plate 200 are disposed on the back side of the touch layer 400. In this embodiment, the material of the touch layer 400 can be, for example, glass, plastic, or a metal sheet, but is not limited to these.

[0044] A first capacitor plate 100 is disposed on the second side of a first insulating substrate 300. The first capacitor plate 100 has a first concave-convex structure, that is, the first capacitor plate 100 in this embodiment is a 3D (three-dimensional) designed capacitor plate. The first side and the second side are opposite sides of the first insulating substrate 300. The second side can be, for example, the lower side, that is, the first capacitor plate 100 is disposed on the lower side of the first insulating substrate 300. The first capacitor plate 100 in this invention is made of a conductive material, such as metal. The first capacitor plate 100 in this embodiment of the invention will deform after being subjected to force.

[0045] In an optional embodiment of the present invention, the capacitive touchscreen may further include a first insulating layer. The first insulating layer is deposited on the surface of the first capacitor plate 100 facing the second capacitor plate 200. Through the first insulating layer, the present invention can greatly reduce the possibility of a short circuit between the first capacitor plate 100 and the second capacitor plate 200.

[0046] An insulating support 600 includes a first end and a second end; the first end is fixedly connected to the first capacitor plate 100. The first end can be, for example, the upper end, meaning the upper end of the insulating support 600 is fixedly connected to the first capacitor plate 100. The insulating support 600 in this invention deforms under stress. The insulating support 600 of this invention is made of insulating material and is used to support the first capacitor plate 100 and the second capacitor plate 200, keeping them separated and preventing them from sticking together.

[0047] In an optional embodiment of the present invention, the insulating support 600 is a strip-shaped insulating element or a plate-shaped insulating element; wherein, a plurality of insulating supports 600 are uniformly distributed between the second insulating substrate 500 and the first capacitor plate 100. Strip-shaped insulating elements have the advantage of simple structure, while plate-shaped insulating elements have the advantage of better support effect. In this embodiment, the shape of the insulating support 600 can be selected according to the actual situation.

[0048] The second insulating substrate 500 is fixedly connected to the second end. (Combined) Figure 3 As shown, the second end can be, for example, the lower end, that is, the lower end of the insulating support 600 is fixedly connected to the second insulating substrate 500.

[0049] The second capacitor plate 200 is disposed on the second insulating substrate 500, specifically fixed to the surface of the second insulating substrate 500. The second capacitor plate 200 has a second concave-convex structure, that is, the second capacitor plate 200 is a 3D (three-dimensional) designed capacitor plate. The first concave-convex structure and the second concave-convex structure are disposed opposite to each other, and the gap between the first concave-convex structure and the second concave-convex structure forms an inductive capacitor. In this embodiment of the invention, the second capacitor plate 200 is made of a conductive material, such as a metal.

[0050] In one or more embodiments of the present invention, the first capacitor plate 100 specifically refers to the TX (Transmitelectrode, driving electrode) of the touch screen, and the second capacitor plate 200 specifically refers to the RX (Receiveelectrode, receiving electrode) of the touch screen; or, the first capacitor plate 100 specifically refers to the RX (Receiveelectrode, receiving electrode) of the touch screen, and the second capacitor plate 200 specifically refers to the TX (Transmitelectrode, driving electrode) of the touch screen.

[0051] In an optional embodiment of the present invention, the capacitive touchscreen may further include a second insulating layer, which is deposited on the surface of the second capacitor plate 200 facing the first capacitor plate 100. Through the second insulating layer, the present invention can greatly reduce the possibility of a short circuit between the first capacitor plate 100 and the second capacitor plate 200.

[0052] like Figures 3 to 22 As shown, in this embodiment of the invention, the first concave-convex structure includes a plurality of first protrusions 111, and the second concave-convex structure includes a plurality of first recesses 211; the first protrusions 111 are correspondingly inserted into the first recesses 211. By using the correspondingly provided first protrusions 111 and first recesses 211, the present invention can improve the sensitivity of capacitance change sensing between the first and second concave-convex structures, thereby improving the accuracy of touch reporting.

[0053] Based on at least one embodiment provided by the present invention, in other embodiments of the present invention, the first concave-convex structure includes a plurality of second recesses; the second concave-convex structure includes a plurality of second protrusions; the second protrusions are used to correspondingly insert into the second recesses. (Combined) Figures 3 to 22 The provided schematic diagram of a capacitive touchscreen structure shows that by interchanged positions of the first capacitor plate 100 and the second capacitor plate 200 provided by this invention, a capacitive touchscreen structure with reasonable modifications can be obtained based on this invention. Based on the above-mentioned optional technical solutions, this invention can also provide more implementable capacitive touchscreen product structures to suit more practical application scenarios.

[0054] like Figure 3 As shown, and can be combined Figures 4 to 7The second capacitor plate 200 of one or more embodiments of the present invention includes a plurality of second sub-plates 210. The second sub-plates 210 extend along a second direction, that is, each second sub-plate 210 extends along the second direction. A first recess 211 is formed on each second sub-plate 210. It can be seen that a second sub-plate 210 in this embodiment has a second concave-convex structure. The first capacitor plate 100 includes a plurality of first sub-plates 110. The first sub-plates 110 extend along a first direction, that is, each first sub-plate 110 extends along the first direction. A first protrusion 111 matching the first recess 211 is formed on each first sub-plate 110. The first direction and the second direction intersect each other. It can be seen that a first sub-plate 110 in this embodiment has a first concave-convex structure. The first recess 211 has three surfaces facing the first protrusion 111. The gaps between the three surfaces and the corresponding surfaces of the first protrusion 111 form inductive capacitors (C1, C2, C3). In this embodiment, the first direction and the second direction have a preset angle, such as 90 degrees, but are not limited to this. By intersecting the first and second concave-convex structures, the present invention can form an array-type capacitive touchscreen based on multiple first and second concave-convex structures. In a preferred embodiment of the present invention, the first direction and the second direction are perpendicular to each other. In specific implementation, the first direction in this embodiment is the Y-axis direction, and the second direction is the X-axis direction, but are not limited to this, as long as the technical objective of the present invention can be achieved. The embodiments of the present invention, by setting the first and second directions perpendicularly, help to reduce the processing difficulty of the first capacitor plate 100 and the second capacitor plate 200, and reduce the manufacturing cost of the capacitive touchscreen of the present invention.

[0055] like Figure 4 As shown, the gap between the first capacitor plate 100 and the second capacitor plate 200 changes when writing with chalk 700. Specifically, the pressing action of chalk 700 causes deformation of the touch layer 400, the first insulating substrate 300, and the first capacitor plate 100. The compressed insulating support 600 also deforms. This process changes the induced capacitance between the first capacitor plate 100 and the second capacitor plate 200, including changing the existing induced capacitance between the first capacitor plate 100 and the second capacitor plate 200 and increasing the new induced capacitance between them. Figures 3 to 4Taking the change as an example, when writing without chalk 700, induced capacitors C1, C2, and C3 are formed between the three surfaces of the first recessed portion 211 facing the first protrusion 111 and the corresponding surfaces of the first protrusion 111. Under the pressure of any pen such as chalk 700, the writing surface deforms. According to the capacitance calculation formula between adjacent capacitor plates, C = ε*S / d, where ε represents the dielectric constant, S represents the relative area between two adjacent capacitor plates, and d represents the distance between two adjacent capacitor plates; then, due to the change of d, the existing induced capacitors C1, C2, and C3 become C1', C2', and C3' respectively, and are transformed by... The change in S adds new sensing capacitors C4', C5', C6', and C7'. In this embodiment, the newly added sensing capacitors are specifically the sensing capacitors formed between the first recessed portion 211 and the first protruding portion 111. It can be seen that in this embodiment, capacitance changes can occur in the Z-axis, X-axis, and Y-axis directions at the writing position, effectively increasing the amount of capacitance change and improving the accuracy of capacitance sensing recognition. This invention can identify the coordinates of positions with capacitance changes, determine the touch behavior occurring at the corresponding position, and thus realize the touch reporting function. By detecting continuous multi-point touch results, corresponding handwriting is generated. Because this embodiment of the invention has a relatively large amount of capacitance change, the touch accuracy, linearity, and sensitivity are better in the smart blackboard secondary screen scenario.

[0056] like Figure 5 , Figure 6 , Figure 7 As shown, in an optional embodiment of the present invention, the first recess 211 is a strip-shaped groove extending along the second direction, which can be understood as a channel formed on the second capacitor plate 200. Figure 5 The diagram shows the positional relationship between the three first sub-electrode plates 110 and the three second sub-electrode plates 210. Figure 6 The diagram illustrates the three-dimensional structure of three first sub-electrode plates 110, each first sub-electrode plate 110 having a first protrusion 111 that matches the second sub-electrode plate 210. Figure 7 The diagram illustrates the three-dimensional structure of three second sub-electrode plates 210, each second sub-electrode plate 210 having a first recess 211. In summary, Figures 3 to 7 It can provide a second capacitor plate 200 with a "2 convex and 1 concave" structure and a first capacitor plate 100 with a corresponding concave and convex structure.

[0057] like Figure 8 As shown, and in combination Figures 9 to 12The second capacitor plate 200 of one or more embodiments of the present invention includes a plurality of second sub-plates 210. The second sub-plates 210 extend along a second direction, that is, each second sub-plate 210 extends along the second direction. At least one first recess 211 and a side groove 212 are formed on each second sub-plate 210. It can be seen that each second sub-plate 210 in this embodiment has a second concave-convex structure. The plurality of second sub-plates 210 are uniformly laid on the second insulating substrate 500, and the plurality of second sub-plates 210 can be arranged side by side along a first direction, for example. The first capacitor plate 100 includes a plurality of first sub-plates 110, which extend along a first direction, i.e., each first sub-plate 110 extends along the first direction. Each first sub-plate 110 has a number of first protrusions 111 equal to the sum of the number of first recesses 211 and the number of side grooves 212. The first direction and the second direction intersect each other. Therefore, each first sub-plate 110 in this embodiment has a first concave-convex structure. In this embodiment, the plurality of first sub-plates 110 are uniformly laid on the first insulating substrate 300, and the plurality of first sub-plates 110 can, for example, be arranged side-by-side along the second direction. The first recesses 211 have three planes facing the first protrusions 111. The gaps between the three surfaces and the corresponding surfaces of the first protrusions 111 respectively form inductive capacitors (C1, C2, C3). The gap between a plane of the side groove 212 facing the first protrusion 111 and the corresponding surface of the first protrusion 111 also forms an inductive capacitor (C4). In this embodiment, the first direction and the second direction have a preset angle, such as 90 degrees, but are not limited to this. By intersecting the first and second concave-convex structures, the present invention can form an array-type capacitive touchscreen based on multiple first and second concave-convex structures. In a preferred embodiment of the present invention, the first direction and the second direction are perpendicular to each other. In specific implementation, the first direction in this embodiment is the Y-axis direction, and the second direction is the X-axis direction, but are not limited to this, as long as the technical objective of the present invention can be achieved. The embodiments of the present invention, by using mutually perpendicular first and second directions, help to reduce the processing difficulty of the first capacitor plate 100 and the second capacitor plate 200, and reduce the manufacturing cost of the capacitive touchscreen of the present invention.

[0058] like Figure 9As shown, the gap between the first capacitor plate 100 and the second capacitor plate 200 changes when writing with chalk 700. Specifically, the pressing action of chalk 700 causes deformation of the touch layer 400, the first insulating substrate 300, and the first capacitor plate 100. The compressed insulating support 600 also deforms. This process changes the induced capacitance between the first capacitor plate 100 and the second capacitor plate 200, including changing the existing induced capacitance between the first capacitor plate 100 and the second capacitor plate 200 and increasing the new induced capacitance between them. Figures 8 to 9 Taking the change as an example, when writing without chalk 700, the three surfaces of the first recessed portion 211 facing the first protrusion 111 and the plane of the side groove portion 212 facing the first protrusion 111 respectively form induced capacitances C1, C2, C3, and C4 with the corresponding surfaces of the first protrusion 111. Under the pressure of any pen such as chalk 700, the writing surface is deformed. According to the capacitance calculation formula between adjacent capacitor plates C=ε*S / d, where ε represents the dielectric constant, S represents the relative area between two adjacent capacitor plates, and d represents the distance between two adjacent capacitor plates; then due to the change of d, the existing induced capacitances C1, C2, C3, and C4 become C1', C2', C3', and C4' respectively, and due to the change of S The changes introduce new sensing capacitors C5', C6', C7', and C8'. Specifically, these new sensing capacitors are those formed between the first recessed portion 211 and the first protruding portion 111, and between the side groove portion 212 and the first protruding portion 111. It can be seen that in this embodiment, capacitance changes can occur along the Z, X, and Y axes at the writing position. The more recessed and protruding structures there are, the greater the capacitance change. This embodiment effectively increases the capacitance change and improves the accuracy of capacitance sensing recognition. This invention can identify the coordinates of positions with capacitance changes, determine the corresponding touch behavior, and thus achieve the function of touch reporting. By detecting continuous multi-point touch results, corresponding handwriting is generated. Because this embodiment of the invention has a relatively large capacitance change, its touch accuracy, linearity, and sensitivity are better in the smart blackboard secondary screen scenario.

[0059] like Figure 10 , Figure 11 , Figure 12 As shown, in an optional embodiment of the present invention, the first recess 211 is a strip-shaped groove extending along the second direction, which can be understood as a channel formed on the second capacitor plate 200, and the side groove 212 is a side groove disposed on the edge of the second capacitor plate 200, which can also be understood as a channel formed on the second capacitor plate 200. Figure 10 The diagram shows the positional relationship between the three first sub-electrode plates 110 and the three second sub-electrode plates 210.Figure 11 The diagram illustrates the three-dimensional structure of three first sub-electrode plates 110, each of which has the same number of first protrusions 111 as the sum of the number of second sub-electrode plates 210 and the number of side grooves 212. Figure 12 The diagram illustrates the three-dimensional structure of three second sub-electrode plates 210, each second sub-electrode plate 210 having a first recess 211 and a side groove 212. In summary, Figures 10 to 12 It can provide a second capacitor plate 200 with a "2 convex and 2 concave" structure and a first capacitor plate 100 with a corresponding concave and convex structure.

[0060] like Figure 13 As shown, and can be combined Figures 14 to 17 The second capacitor plate 200 of one or more embodiments of the present invention includes a plurality of second sub-plates 210. The second sub-plates 210 extend along a second direction, that is, each second sub-plate 210 extends along the second direction. Two first recesses 211 are formed on each second sub-plate 210. It can be seen that in this embodiment, each second sub-plate 210 has a second concave-convex structure. The first capacitor plate 100 includes a plurality of first sub-plates 110. The first sub-plates 110 extend along a first direction, that is, each first sub-plate 110 extends along the first direction. A first protrusion 111 matching the first recess 211 is formed on each first sub-plate 110. It can be seen that in this embodiment, each first sub-plate 110 has a first concave-convex structure. Wherein, the first direction and the second direction intersect each other. The first recess 211 has five surfaces facing the first protrusion 111. The gaps between the five surfaces and the corresponding surfaces of the first protrusion 111 respectively form inductive capacitors (C1, C2, C3, C4, C5).

[0061] like Figure 14 As shown, the gap between the first capacitor plate 100 and the second capacitor plate 200 changes when writing with chalk 700. Specifically, the pressing action of chalk 700 causes deformation of the touch layer 400, the first insulating substrate 300, and the first capacitor plate 100. The compressed insulating support 600 also deforms. This process changes the induced capacitance between the first capacitor plate 100 and the second capacitor plate 200, including changing the existing induced capacitance between the first capacitor plate 100 and the second capacitor plate 200 and increasing the new induced capacitance between them. Figures 13 to 14Taking the change as an example, when writing without chalk 700, the five surfaces of the first recess 211 facing the first protrusion 111 and the corresponding surfaces of the first protrusion 111 form induced capacitors C1, C2, C3, C4, and C5. Under the pressure of any pen such as chalk 700, the writing surface is deformed. According to the capacitance calculation formula between adjacent capacitor plates, C = ε * S / d, where ε represents the dielectric constant, S represents the relative area between two adjacent capacitor plates, and d represents the distance between two adjacent capacitor plates; then due to the change of d, the existing induced capacitors C1, C2, C3, C4, and C5 become C1', C2', C3', C4', and C5' respectively, and due to the change of S, new induced capacitors C6', C7', C8', C9', C10', and C11' are added. In this embodiment, the newly added induced capacitors are specifically the induced capacitors formed between the two first recesses 211 and the first protrusion 111. As can be seen, in this embodiment, capacitance changes can occur along the Z, X, and Y axes at the writing position. The more concave and convex structures there are, the greater the capacitance change. This embodiment effectively increases the capacitance change and improves the accuracy of capacitance sensing recognition. This invention can identify the coordinates of positions with capacitance changes, determine the touch behavior occurring at the corresponding position, and thus realize the touch reporting function. By detecting continuous multi-point touch results, corresponding handwriting is generated. Because this embodiment of the invention has a relatively large capacitance change, it offers better touch accuracy, linearity, and sensitivity in the smart blackboard secondary screen scenario.

[0062] like Figure 15 , Figure 16 , Figure 17 As shown, in an optional embodiment of the present invention, the first recess 211 is a strip-shaped groove extending along the second direction, which can be understood as a channel formed on the second capacitor plate 200. Figure 15 The diagram shows the positional relationship between the three first sub-electrode plates 110 and the three second sub-electrode plates 210. Figure 16 The diagram illustrates the three-dimensional structure of three first sub-electrode plates 110, each first sub-electrode plate 110 having a first protrusion 111 that matches the second sub-electrode plate 210. Figure 17 The diagram illustrates the three-dimensional structure of three second sub-electrode plates 210, each second sub-electrode plate 210 having two first recesses 211. In summary, Figures 13 to 17 It can provide a second capacitor plate 200 with a "3 convex and 2 concave" structure and a first capacitor plate 100 with a corresponding concave and convex structure.

[0063] like Figure 18 As shown, and can be combined Figures 19 to 22The second capacitor plate 200 of one or more embodiments of the present invention includes a plurality of second sub-plates 210, which extend along a second direction, i.e., each second sub-plate 210 extends along the second direction, and a first recess 211 is formed on each second sub-plate 210; it can be seen that a second sub-plate 210 in this embodiment has a second concave-convex structure. The first capacitor plate 100 includes a plurality of first sub-plates 110, which extend along a first direction, i.e., each first sub-plate 110 extends along the first direction, and a first protrusion 111 matching the first recess 211 is formed on each first sub-plate 110; it can be seen that a first sub-plate 110 in this embodiment has a first concave-convex structure. The first direction and the second direction intersect each other, and the first recess 211 has three surfaces facing the first protrusion 111. The gaps between the three surfaces and the corresponding surfaces of the first protrusion 111 respectively form inductive capacitors (C1, C2, C3). Figures 3 to 7 Unlike the capacitor plate structure shown in the previous embodiment, in this embodiment the first recess 211 is a groove extending along a third direction; wherein, the third direction is the direction in which the first protrusion 111 extends.

[0064] like Figure 19 As shown, the gap between the first capacitor plate 100 and the second capacitor plate 200 changes when writing with chalk 700. Specifically, the pressing action of chalk 700 causes deformation of the touch layer 400, the first insulating substrate 300, and the first capacitor plate 100. The compressed insulating support 600 also deforms. This process changes the induced capacitance between the first capacitor plate 100 and the second capacitor plate 200, including changing the existing induced capacitance between the first capacitor plate 100 and the second capacitor plate 200 and increasing the new induced capacitance between them. Figures 18 to 19Taking the change as an example, when writing without chalk 700, induced capacitors C1, C2, and C3 are formed between the three surfaces of the first recessed portion 211 facing the first protrusion 111 and the corresponding surfaces of the first protrusion 111. Under the pressure of any pen such as chalk 700, the writing surface is deformed. According to the capacitance calculation formula between adjacent capacitor plates, C = ε * S / d, where ε represents the dielectric constant, S represents the relative area between two adjacent capacitor plates, and d represents the distance between two adjacent capacitor plates; then, due to the change of d, the existing induced capacitors C1, C2, and C3 become C1', C2', and C3' respectively, and due to the change of S, new induced capacitors are added. The sensing capacitors C4', C5', C6', C7', C8', C9', C10', and C11' are used. In this embodiment, the newly added sensing capacitor is specifically the sensing capacitor formed circumferentially between the first recessed portion 211 and the first protruding portion 111. It can be seen that in this embodiment, capacitance changes can occur in the Z-axis, X-axis, and Y-axis directions at the writing position, effectively increasing the amount of capacitance change and improving the accuracy of capacitance sensing recognition. This invention can identify the coordinates of positions with capacitance changes, determine the touch behavior occurring at the corresponding position, and thus realize the touch reporting function. By detecting continuous multi-point touch results, corresponding handwriting is generated. This embodiment of the invention has a greater amount of capacitance change, therefore, this embodiment of the invention has better touch accuracy, linearity, and sensitivity in the smart blackboard secondary screen scenario.

[0065] like Figure 20 , Figure 21 , Figure 22 As shown, in an optional embodiment of the present invention, the first recess 211 is a groove extending along a third direction; wherein, the third direction is the direction in which the first protrusion 111 extends. Figure 20 The diagram shows the positional relationship between the three first sub-electrode plates 110 and the three second sub-electrode plates 210. Figure 21 The diagram illustrates the three-dimensional structure of three first sub-electrode plates 110, each first sub-electrode plate 110 having a first protrusion 111 that matches the second sub-electrode plate 210. Figure 21 The diagram illustrates the three-dimensional structure of three second sub-electrode plates 210, each second sub-electrode plate 210 having a first recess 211. In summary, Figures 20 to 22 A second capacitor plate 200 with a "U-shaped groove" structure and a first capacitor plate 100 with a corresponding concave-convex structure are provided.

[0066] Based on the same inventive concept as the capacitive touchscreen provided in at least one embodiment of the present invention, the present invention can also provide a touch device, which may include, but is not limited to, the capacitive touchscreen in any embodiment of the present invention. The specific structure of the capacitive touchscreen has been described in detail in this specification and will not be repeated here. The touch device provided by the present invention is a capacitive touch device. Compared with touch devices based on resistive touchscreens, the present invention can provide a more ideal writing effect when used for chalk 700 writing, and the writing accuracy, linearity, and response speed can better meet the actual writing requirements of chalk 700.

[0067] Based on the same inventive concept as the capacitive touchscreen provided in at least one embodiment of the present invention, the present invention can also provide a smart blackboard sub-screen, which includes, but is not limited to, the capacitive touchscreen or the touch device in any embodiment of the present invention. Thus, the present invention provides a 3DPattern (stereographic) capacitive touchscreen solution for a smart blackboard sub-screen. The specific structure of the capacitive touchscreen has been described in detail in this specification and will not be repeated here.

[0068] like Figure 23 As shown, based on the same inventive concept as the capacitive touchscreen provided in at least one embodiment of the present invention, the present invention can also provide a smart blackboard, which includes, but is not limited to, a smart blackboard main screen 10 and a smart blackboard sub-screen in any embodiment of the present invention. The smart blackboard in the embodiments of the present invention includes a smart blackboard main screen 10 and two smart blackboard sub-screens respectively disposed on the left and right sides of the smart blackboard main screen 10. On the rear side of the touch layer 400 (touch surface) of the smart blackboard sub-screen, multiple first capacitor plates 100 are disposed along the X-axis direction and multiple second capacitor plates 200 are disposed along the Y-axis direction, and the multiple first capacitor plates 100 and multiple second capacitor plates 200 are alternately arranged.

[0069] While it is possible to use a conductor pen (a pen made of conductor for writing on a smart blackboard sub-screen) to write on a conventional planar Pattern capacitive screen to achieve the purpose of touch reporting, this invention breaks through the limitation of having to use a conductor pen. This invention provides a design scheme that uses a 3DPattern capacitive sensing plate on the back of the smart blackboard sub-screen, achieving the technical effect of touch reporting even when using traditional chalk for touch.

[0070] It should be understood that the capacitive touch screen specifically provided in the embodiments of the present invention can be applied not only to the secondary screen of the smart blackboard, but also to the main screen of the smart blackboard based on the embodiments of the present invention, and even to touch devices such as smartphones, smartwatches, tablets, laptops, desktop monitors, televisions, digital cameras, smart bracelets, smart glasses, in-vehicle displays, medical devices, industrial control equipment smart interactive flat panels and touch interactive terminals.

[0071] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and simple improvements made on the substantive content of the present invention should be included within the protection scope of the present invention.

Claims

1. A capacitive touchscreen, characterized in that, include: First insulating substrate (300); A touch layer (400) is disposed on the first side of the first insulating substrate (300); A first capacitor plate (100) is disposed on the second side of the first insulating substrate (300), the first side and the second side being opposite sides of the first insulating substrate (300); the first capacitor plate (100) has a first uneven structure including a plurality of first protrusions (111); the first insulating substrate (300), the touch layer (400) and the first capacitor plate (100) deform after being subjected to force; An insulating support (600) includes a first end and a second end; the first end is fixedly connected to the first capacitor plate (100); The second insulating substrate (500) is fixedly connected to the second end of the insulating support (600); The second capacitor plate (200) with a U-shaped groove structure is disposed on the second insulating substrate (500); the second capacitor plate (200) has a second concave-convex structure including a plurality of first recesses (211), the first recesses (211) being grooves extending in the direction of the first protrusions (111), and the first protrusions (111) being correspondingly placed into the first recesses (211); The first concave-convex structure and the second concave-convex structure are arranged opposite to each other, and the gap between the first concave-convex structure and the second concave-convex structure forms a sensing capacitor; the sensing capacitor changes when the first capacitor plate (100) is deformed, increasing the sensing capacitor formed circumferentially between the first recess (211) and the first protrusion (111), so that the sensing capacitor changes in the Z-axis, X-axis and Y-axis directions at the writing position.

2. The capacitive touchscreen according to claim 1, characterized in that, The first concave-convex structure also includes a plurality of second recesses; The second concave-convex structure also includes a plurality of second protrusions; The second protrusion is used to be inserted into the second recess.

3. The capacitive touchscreen according to claim 1, characterized in that, The second capacitor plate (200) includes a plurality of second sub-plates (210), the second sub-plates (210) extending along a second direction, and one or more of the first recesses (211) are formed on each second sub-plate (210). The first capacitor plate (100) includes a plurality of first sub-plates (110), the first sub-plates (110) extending along a first direction, and a first protrusion (111) matching the first recess (211) is formed on each first sub-plate (110). The first recess (211) has three surfaces facing the first protrusion (111), and the gaps between the three surfaces and the corresponding surfaces of the first protrusion (111) respectively form inductive capacitors. The first direction and the second direction intersect each other.

4. The capacitive touchscreen according to claim 1, characterized in that, The second capacitor plate (200) includes a plurality of second sub-plates (210), which extend along a second direction, and each second sub-plate (210) has at least one first recess (211) and a side groove (212) formed on it. The first capacitor plate (100) includes a plurality of first sub-plates (110), the first sub-plates (110) extend along a first direction, and each first sub-plate (110) has a number of first protrusions (111) that are the same as the sum of the number of the first recesses (211) and the number of the side grooves (212). The first recess (211) has three planes facing the first protrusion (111), and the gaps between the three surfaces and the corresponding surfaces of the first protrusion (111) respectively form inductive capacitors. The gap between a plane of the side groove (212) facing the first protrusion (111) and the corresponding surface of the first protrusion (111) also forms an inductive capacitor. The first direction and the second direction intersect each other.

5. The capacitive touchscreen according to claim 3 or 4, characterized in that, The first direction and the second direction are perpendicular to each other.

6. The capacitive touchscreen according to claim 1, characterized in that, The insulating support (600) is a strip-shaped insulating element or a plate-shaped insulating element; wherein, a plurality of the insulating supports (600) are evenly distributed between the second insulating substrate (500) and the first capacitor plate (100).

7. The capacitive touchscreen according to claim 1, characterized in that, Also includes: A first insulating layer is laid on the surface of the first capacitor plate (100) facing the second capacitor plate (200).

8. The capacitive touchscreen according to claim 1 or 7, characterized in that, Also includes: The second insulating layer is laid on the surface of the second capacitor plate (200) facing the first capacitor plate (100).

9. A touch device, characterized in that, Includes the capacitive touchscreen as described in any one of claims 1 to 8.

10. A smart blackboard sub-screen, characterized in that, It includes the capacitive touch screen as described in any one of claims 1 to 8 or the touch device as described in claim 9.

11. A smart blackboard, characterized in that, It includes a smart blackboard main screen and a smart blackboard secondary screen as described in claim 10.

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