Electromagnetic touch screen and electromagnetic touch device

Abstract

An embodiment of the present invention provides an electromagnetic touch screen and an electromagnetic touch device. The electromagnetic touch screen includes a substrate, a transmitting coil, and a receiving coil. The above coils may include a multi-turn transmitting coil and a receiving coil. During the interaction between the stylus and the electromagnetic touch screen, the transmitting coil generates a transmitting signal and forms an electric field and a magnetic field. The stylus is charged under the action of the electric field and the magnetic field. When a touch operation is performed, the receiving coil forms a receiving signal according to the electric field and the magnetic field generated by the stylus, and determines the touch position of the stylus according to the above receiving signal. Furthermore, the touch accuracy and performance of the device are improved through different electromagnetic coils.

Description

Technical Field

[0001] The present invention relates to the technical field of touch control of display panels, and particularly to an electromagnetic touch screen and an electromagnetic touch control device. Background Art

[0002] With the development of communication technologies, electronic devices such as smart phones have become increasingly popular. In the field of small and medium-sized displays, the integration technology has become the current key research and development direction, that is, how to achieve panel function integration through the development of related technologies. Integration can also ensure that the thickness of the display panel does not increase while ensuring that the functions are not missing. The integration technology of the display panels prepared in the prior art can bring many derivative additional functions to the display panel, so that the display panel gradually transitions from a simple display interface to a comprehensive perception and interaction interface.

[0003] Currently, most of the mainstream interactive stylus technologies are based on capacitive touch. For example, the stylus technology has a low cost, but capacitive touch requires a large charge difference, resulting in a large tip, poor writing experience, high latency, low accuracy, etc., which further limits the further development of the stylus in the professional field and is not conducive to the further improvement of the user's touch experience. With the development of touch control technologies, a passive electromagnetic pen is usually used to replace the traditional capacitive touch pen and touch screen. However, due to the relatively complex driving circuit of the electromagnetic pen and electromagnetic touch screen prepared in the prior art, each coil needs to transmit and receive signals each time it is driven, resulting in a relatively long overall time for one reporting point. Especially in the case of integrated design, the relative impedance is higher and the charging time required is longer. As a result, the touch effect of the electromagnetic stylus during touch is poor, and there is also a problem of unsatisfactory screen reporting accuracy.

[0004] In summary, during the use of the electromagnetic stylus prepared in the prior art, the problems of unsatisfactory touch operation and touch reporting accuracy are not conducive to the further improvement of the touch performance of the display panel. Summary of the Invention

[0005] Embodiments of the present invention provide an electromagnetic touch screen and an electromagnetic touch control device, which can effectively improve the technical problems of unsatisfactory touch operation and touch reporting accuracy when the electromagnetic stylus performs touch operations.

[0006] To solve the above technical problems, the present invention provides an electromagnetic touch screen, including:

[0007] A substrate;

[0008] A transmitting coil, which is disposed on the substrate; and,

[0009] A receiving coil, which is disposed on the substrate;

[0010] Wherein, the orthographic projection of the transmitting coil on the substrate is perpendicular to the orthographic projection of the receiving coil on the substrate. The transmitting coil is disposed in the peripheral area around the receiving coil, and the transmitting coil is used to transmit a control signal, while the receiving coil is used to receive the control signal.

[0011] According to an embodiment of the present invention, the electromagnetic touch screen includes a display area and a non-display area disposed on at least one side of the display area.

[0012] Wherein, multiple turns of the transmitting coil and multiple turns of the receiving coil are at least correspondingly disposed in the display area, and the transmitting coil is at least disposed in the non-display area.

[0013] Wherein, the number of the transmitting coils is less than the number of the receiving coils.

[0014] According to an embodiment of the present invention, the number of the transmitting coils is greater than 1 and less than 4.

[0015] According to an embodiment of the present invention, the distance between two adjacent turns of the transmitting coil is set to be 1 mm - 10 mm, and the distance between two adjacent turns of the receiving coil is set to be 1 mm - 10 mm.

[0016] According to an embodiment of the present invention, the trace width of the transmitting coil is greater than the trace width of the receiving coil.

[0017] According to an embodiment of the present invention, the ratio of the width of the transmitting coil to the width of the receiving coil is 5 - 20.

[0018] According to an embodiment of the present invention, the receiving coil includes a first receiving coil and a second receiving coil.

[0019] Wherein, the first receiving coil and the second receiving coil are disposed in different planes, and the orthographic projection of the first receiving coil on the substrate is perpendicular to the orthographic projection of the second receiving coil on the substrate.

[0020] According to an embodiment of the present invention, the electromagnetic touch screen further includes a control chip disposed on the substrate. The control chip is used to provide a transmitting or receiving control signal to the transmitting coil and the receiving coil, and both ends of the transmitting coil are electrically connected to the control chip, and both ends of the receiving coil are electrically connected to the control chip.

[0021] According to an embodiment of the present invention, the electromagnetic touch screen includes a transmitting stage and a receiving and identifying stage.

[0022] Wherein, during the time sequences corresponding to the transmitting stage and the receiving and recognizing stage, the control chip is used to provide a continuous or periodic control signal to the transmitting coil, and the transmitting coil is used to form a first induction magnetic field and transmit the control signal, and charge the stylus;

[0023] During the time sequence corresponding to the receiving and recognizing stage, the stylus discharges and forms a second induction magnetic field, the receiving coil scans row by row, and the receiving coil receives the control signal in the second induction magnetic field, and the control chip is used to determine the touch position according to the control signal.

[0024] According to a second aspect of an embodiment of the present invention, there is also provided an electromagnetic touch device, and the electromagnetic touch device further includes:

[0025] A control unit, which receives a touch signal and provides a transmission signal to a transmitting coil in the electromagnetic touch screen and provides a receiving signal to a receiving coil in the electromagnetic touch screen according to the touch signal;

[0026] A transmitting unit, which receives the control signal transmitted by the control unit;

[0027] An induction unit, which includes a transmitting coil and a receiving coil. The transmitting coil is used to transmit a signal and form a first magnetic field, and the first magnetic field is used to charge the stylus. At the same time, the receiving coil forms a receiving signal according to the stylus; and,

[0028] A receiving unit, which is used to receive the receiving signal of the induction unit and transmit the receiving signal to the control unit, and the control unit is used to judge the position of the stylus according to the receiving signal.

[0029] According to an embodiment of the present invention, the control unit further includes:

[0030] A selection circuit, which is electrically connected to the induction unit, and the selection circuit is used to receive the receiving signal in the induction unit;

[0031] A detection circuit, which is connected to the selection circuit, and the detection circuit is used to detect the receiving signal transmitted by the selection circuit;

[0032] A filtering circuit, which is connected to the detection circuit, and the filtering circuit is used to filter the detected receiving signal and obtain an available induction signal; and,

[0033] A control circuit, which is connected to the filtering circuit, is configured to receive the available induction signal and obtain the position of the stylus based on the available induction signal.

[0034] Advantages of the embodiments of the present invention: Compared with the prior art, the embodiments of the present invention provide an electromagnetic touch screen and an electromagnetic touch device. The electromagnetic touch screen includes a substrate, a transmitting coil, and a receiving coil. During the interaction between the electromagnetic stylus and the electromagnetic touch screen, the transmitting coil generates a transmitting signal and forms a corresponding electric field and magnetic field. The stylus is charged under the action of the electric field and magnetic field. When a touch occurs, the receiving coil forms a receiving signal based on the electric field and magnetic field generated by the stylus, and determines the touch position of the stylus according to the above receiving signal. In the embodiments of the present application, by providing a transmitting coil and a receiving coil, the transmitting signal and the receiving signal are formed by different induction coils, thereby effectively improving the touch accuracy and performance of the electromagnetic stylus. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1A It is a schematic plan view of the electromagnetic touch screen provided in the embodiments of the present application;

[0037] Figure 1B It is a schematic diagram of the film layer structure of the electromagnetic touch screen provided in the embodiments of the present application;

[0038] Figure 2A It is a schematic diagram of the setting structure of the electromagnetic coil provided in the embodiments of the present application;

[0039] Figure 2B In the embodiments of the present application Figure 2A It is a schematic diagram of the arrangement of two adjacent turns of coils;

[0040] Figure 2C It is a schematic diagram of the structure of another electromagnetic coil provided in the embodiments of the present application;

[0041] Figure 3 It is a schematic diagram of the working principle of the first transmitting coil provided in the embodiments of the present application;

[0042] Figure 4 It is a schematic diagram of the working principle of the first receiving coil provided in the embodiments of the present application;

[0043] Figure 5It is a timing diagram corresponding to the electromagnetic drive in a traditional electromagnetic touch screen;

[0044] Figures 6 - 7 It is a timing diagram of the electromagnetic drive corresponding to the electromagnetic coil provided in the embodiment of the present application;

[0045] Figure 8 It is a schematic plan view of the electromagnetic touch device provided in the embodiment of the present application;

[0046] Figure 9 It is a schematic structural diagram of an electromagnetic touch device provided in the embodiment of the present application;

[0047] Figure 10 It is a method for sensing touch points provided in the embodiment of the present application. Detailed implementation manners

[0048] The following will combine the accompanying drawings in the embodiments of the present invention. The following disclosure provides different implementation manners or examples to implement different structures of the present invention. To simplify the present invention, the components and settings of specific examples are described below. In addition, various specific examples of processes and materials are provided in the present invention, and those skilled in the art can realize the application of other processes. All other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0050] With the continuous development of display panel manufacturing technology, people have put forward higher requirements for the performance and display effect of display panels and display devices.

[0051] For a touch display panel, a stylus is usually used to improve the user's touch experience. However, in the prior art, when using the stylus to touch the touch display panel, the touch effect and accuracy are not ideal and cannot achieve the best touch usage experience.

[0052] An embodiment of the present application provides an electromagnetic touch screen and an electromagnetic touch device, which can effectively improve the touch accuracy and touch effect during touch operations of an electric field touch screen.

[0053] As Figure 1A shown, Figure 1A It is a schematic plan view of the electromagnetic touch screen provided in the embodiment of the present application. In the embodiment of the present application, the electromagnetic touch screen includes a display area 22 and a non-display area 21. Among them, the display area 22 can be disposed at least on one side of the non-display area 21. In the following embodiments, the non-display area 21 can be disposed around the display area 22, such as the non-display area 21 is disposed at the edge area position of the electromagnetic touch screen.

[0054] Furthermore, the electromagnetic touch screen further includes a substrate 101 and a plurality of induction coils. Specifically, the induction coil can include a transmitting coil 311 and a receiving coil 31. Specifically, both the transmitting coil 311 and the receiving coil 31 can be correspondingly disposed on the induction layer. When setting, both the transmitting coil 311 and the receiving coil 31 can be disposed on the substrate 101, and the transmitting coil 311 and the receiving coil 31 can be disposed in different planes. Specifically, the receiving coil 31 is correspondingly disposed above the transmitting coil 311. At this time, the transmitting coil 311 and the receiving coil 31 can be located on different film layers. Further, when setting, the transmitting coil 311 can also be disposed on the same film layer as the receiving coil 31, and the transmitting coil 311 surrounds the receiving coil 31.

[0055] In the embodiment of the present application, both the transmitting coil 311 and the receiving coil 31 can be set as multi-turn electromagnetic coils. The multi-turn electromagnetic coils can be arranged at equal intervals. For example, the transmitting coil 311 is arranged at equal intervals on an induction layer. At the same time, the electromagnetic coils are at least disposed in the display area 22. In the following embodiments, the case where the electromagnetic coils are disposed in the display area 22 and the non-display area 21 will be taken as an example for description.

[0056] Furthermore, when setting the electromagnetic coil corresponding to the receiving coil 31, the receiving coil 31 can be set as receiving coils in a plurality of different planes. Specifically, in the following embodiments, the receiving coil 31 will be described by taking the first receiving coil 312 and the second receiving coil 313 as examples. Specifically, the first receiving coil 312 and the second receiving coil 313 can be disposed in different planes, or can be disposed on the same film layer according to actual situations. For example, when the two receiving coils are disposed in different planes, via structures can be disposed at the start and end of each coil to be electrically connected to devices in other film layers.

[0057] Meanwhile, on the plane corresponding to the first receiving coil 312, the first receiving coil 312 has multiple turns, and on the plane corresponding to the second receiving coil 313, the second receiving coil 313 is also set to have multiple turns. In this way, within a horizontal plane corresponding to the substrate 101, the first receiving coil 312 is equivalent to an electromagnetic coil in the horizontal direction, while the second receiving coil 313 is equivalent to an electromagnetic coil in the Y direction.

[0058] Furthermore, the electromagnetic touch screen further includes a transmitting coil 311. In the embodiment of the present application, when setting the electromagnetic coil corresponding to the transmitting coil 311, the transmitting coil 311 is correspondingly arranged within the peripheral area around the receiving coil 31. For example, the transmitting coil 311 surrounds the receiving coil 31.

[0059] In the embodiment of the present application, the transmitting coil 311 is also correspondingly set to have multiple turns. Figure 1A In the figure, only 1 turn of the coil is drawn. Meanwhile, the number of the transmitting coils 311 is less than the number of the receiving coils. Preferably, the number of the transmitting coils is set to be greater than 1 and less than 4. Specifically, in the following embodiments, the transmitting coil 311 is set to 1 turn as an example.

[0060] When the above electromagnetic coils are working in the electromagnetic touch screen, when a stylus is used to perform a touch operation on the electromagnetic touch screen, under the action of an electrical signal, the magnetic coils will generate an induced electric field and an induced magnetic field, and the induced electric field or magnetic field will charge the stylus. When the stylus touches the screen, the stylus will feedback the touch signal to the electromagnetic touch screen through the electromagnetic coil, and finally realize the touch of the screen and obtain the touch position of the stylus.

[0061] Specifically, when setting the above electromagnetic coils, the electromagnetic coils can be set in the passivation layer. Then other film layer structures are set on the passivation layer. Preferably, each electromagnetic coil can be directly and flatly set in the passivation layer to form an electromagnetic induction layer, and then act on the external stylus.

[0062] Specifically, as Figure 1B shown, Figure 1B is a schematic diagram of the film layer structure of the electromagnetic touch screen provided by the embodiment of the present application. Combining with Figure 1A the plane structure diagram in. In the embodiment of the present application, the electromagnetic touch screen may include a substrate 101 and an induction layer provided on the substrate 101. Specifically, the induction layer can be set as a multi-layer structure. In the following embodiments, the induction layer is described by taking the first induction layer 301 and the second induction layer 302 as examples. Furthermore, the induction layer can also be set to other numbers of induction layers, which are specifically set according to actual product requirements and will not be elaborated here.

[0063] Preferably, the first induction layer 301 is disposed on the substrate 101, and the second induction layer 302 is disposed on the first induction layer 301. Meanwhile, a light-emitting device layer 355 is further disposed on the second induction layer 302, and a protective layer 356 is further disposed on the light-emitting device layer 355.

[0064] Specifically, a transmitting coil 311 is disposed in the first induction layer 301, and a first receiving coil 312 is disposed in the second induction layer 302. Specifically, the transmitting coil 311 can be disposed on one side surface close to the first induction layer 301, and the first receiving coil 312 can be disposed on one side of the second induction layer 302 close to the transmitting coil 311.

[0065] In the embodiment of the present application, a second receiving coil 313 can also be disposed in other film layers. When setting, the relationship between the second receiving coil 313 and the transmitting coil 311 can be set according to Figure 1A the limitations in, or refer to the setting method of the first receiving coil 312, which will not be elaborated here. Specifically, the orthographic projection of the first receiving coil 312 is perpendicular to the orthographic projection of the second receiving coil 313. For example, in the same vertical direction, the first receiving coil and the second receiving coil are at least partially perpendicular. When the stylus performs a touch operation on the protective layer 356, each electromagnetic coil can form different electric fields or magnetic fields on the stylus, thereby realizing the touch function.

[0066] Specifically, when setting the above-mentioned first receiving coil and second receiving coil, the number of turns of the coils in the two electromagnetic coils can be the same. Or according to needs, the two receiving coils can be set to different numbers of turns, which will not be elaborated here.

[0067] Specifically, as Figure 2A shown, Figure 2A is a schematic diagram of the setting structure of the electromagnetic coil provided by the embodiment of the present application.

[0068] Specifically, when setting the receiving induction coil provided by the embodiment of the present application, the first receiving coil 312 can include multiple turns of coils. The corresponding projections of each coil can at least partially overlap, and a via 25 is disposed at the overlapping position to prevent adjacent coils from short-circuiting. And the first receiving coil 312 can be disposed inside the transmitting coil 311, such as the first transmitting coil 311 is disposed around the first receiving coil 312.

[0069] Meanwhile, the number of turns of the transmitting coil 311 is less than the number of turns of the first receiving coil 312. In the following embodiments, the transmitting coil 311 is set to one turn, and the first receiving coil 312 is set to multiple turns, such as 3 turns. Further, it can also be set according to the specific size specifications of the product, which will not be elaborated in detail here.

[0070] Among them, the transmitting coil 311 and the first receiving coil 312 can be set as rectangular coils or coils of other shapes. At the same time, the electromagnetic touch screen further includes a control chip. Both the transmitting coil 311 and the first receiving coil 312 are electrically connected to the control chip. For example, the start and end ends of the first receiving coil 312 are respectively electrically connected to different terminals on the control chip, thereby forming a closed loop with the control chip. Specifically, for each turn of the coil, the two ends of each turn of the coil are respectively electrically connected to the control chip, so as to provide a driving signal to the corresponding induction coil through the control chip. Preferably, when setting the second receiving coil, the second receiving coil is also correspondingly electrically connected to the control chip. In the embodiment of the present application, the control chip connected to the first receiving coil can be the same control chip as the control chip connected to the first receiving coil, or according to the product requirements, they are respectively electrically connected to different control chips.

[0071] Further, in the embodiment of the present application, the transmitting coils 311 can be arranged at intervals, and the first receiving coils 312 are also arranged at intervals, such as Figure 2A the arrangement structure in

[0072] As Figure 2B shown in Figure 2B is Figure 2A the schematic diagram of the arrangement of two adjacent turns of coils in

[0073] Specifically, two turns of the first receiving coils 312 are taken as coil X1 and coil X2 for example. Among them, a plurality of light-emitting units 62 arranged in an array are provided in the electromagnetic touch screen. Figure 2B Only the plurality of light-emitting units 62 in the first row and the second row of the electromagnetic touch screen are drawn in

[0074] In the embodiment of the present application, the distance between the coil X1 and the coil X2 is set to be 1 mm - 10 mm. For example, the upper trace corresponding to the coil X1 is arranged between the first row of light-emitting units and the second row of light-emitting units of the electromagnetic touch screen. At the same time, the lower trace of the coil X1 is correspondingly arranged at the gap between the third row and the fourth row of light-emitting units of the electromagnetic touch screen. The left trace of the coil X1 is arranged at the left edge position of the electromagnetic touch screen, and the right trace of the coil X1 is arranged at the right edge position of the electromagnetic touch screen, thus forming a complete coil X1. When setting the coil X2, the upper trace of the coil X2 is arranged at the gap between the second row and the third row of light-emitting units 62 of the electromagnetic touch screen. At the same time, the lower trace of the coil X2 is arranged at the gap between the fourth row and the fifth row of light-emitting units 62. The left trace of the coil X2 is arranged at the left edge of the electromagnetic touch screen, and the right trace of the coil X2 is arranged at the right edge of the electromagnetic touch screen, and finally forms the first receiving coil corresponding to the coil X1 and the coil X2. At this time, both the coil X1 and the coil X2 surround two rows of light-emitting units. Arrange the traces of other adjacent turns of coils in sequence according to the above arrangement rule.

[0075] Among them, multiple turns of the transmitting coil 311 can be arranged at equal intervals, and multiple turns of the second receiving coil 313 can also be arranged at equal intervals, and their arrangement rule is set according to the column direction of the light-emitting units. When arranging in the column direction corresponding to the light-emitting units, its setting rule is the same as that in the row direction of the light-emitting units, which will not be elaborated here.

[0076] Preferably, the distance between two adjacent first receiving coils 312 can be set to D2. At the same time, the distance between two adjacent first receiving coils 312 can also be set at equal intervals. For example, the distance between two adjacent first receiving coils 312 is set to D. The above distance D and the distance D2 can be set according to the requirements of the actual product. In the embodiment of the present application, when defining the distance between two adjacent turns of the first receiving coil 312, it can be defined by the distance between the upper traces corresponding to two adjacent turns of the first receiving coil 312, or by the distance between the input ends of two adjacent turns of coil traces. See Figure 2B In, the distance D between the coil X1 and the coil X2 is the distance between the upper trace of the coil X1 and the upper trace of the coil X2. Similarly, the distance between two adjacent turns of the transmitting coil is the distance between the corresponding left traces of the adjacent transmitting coils. See Figure 1A for the distance D2 in.

[0077] In the embodiments of the present application, the spacing distance between two adjacent turns of the above-mentioned transmitting coil 311 is set to be 1 mm - 10 mm. The spacing distance D between two adjacent turns of the above-mentioned first receiving coil 312 is set to be 1 mm - 10 mm. Preferably, the spacing distance between two adjacent turns of the transmitting coil 311 is set to be 3 mm. At the same time, the spacing distance between two adjacent turns of the first receiving coil 312 is set to be 5 mm. Or, according to the requirements of specific products, the above different spacing distances can be adjusted. The distance D can also be made the same as the distance D2. In the embodiments of the present application, by arranging multiple turns of coils at equal intervals, the electromagnetic fields between adjacent coils can be ensured to have a consistent effect, thereby ensuring the effect of the electromagnetic coils in the same induction layer on the stylus and improving its effect on the stylus.

[0078] Preferably, when setting the above-mentioned transmitting coil 311 and the first receiving coil 312, the trace width of the transmitting coil 311 is greater than the trace width corresponding to the first receiving coil 312. For example, the diameter of the wire of the transmitting coil 311 is greater than the diameter of the wire of the first receiving coil 312. When a current is passed through the transmitting coil 311, since the trace width of the transmitting coil 311 is greater than the trace width of the first receiving coil 312, the electric field or magnetic field generated by it is greater than the electric field or magnetic field generated by the corresponding first receiving coil 312. Thus, it is ensured that the transmitting coil 311 has a relatively large transmitting power and improves its effect on the stylus. At the same time, in the embodiments of the present application, when setting the above-mentioned first receiving coil 312 and the transmitting coil 311, the first receiving coil 312 and the transmitting coil 311 can be arranged on the same layer, so as to effectively ensure the consistency of the effects of different electromagnetic coils on the stylus.

[0079] Specifically, the ratio of the trace line width of the transmitting coil 311 to the trace width of the first receiving coil can be 5 - 20. Preferably, the trace line width of the first transmitting coil 311 is set to be 5 mm, and the width of the corresponding first receiving coil is set to be 1 mm. At this time, the ratio of the trace width of the transmitting coil 311 to the trace width of the first receiving coil is 5. In this way, the transmitting coil can have a relatively large transmitting power and can have a good power ratio with the first receiving coil, thereby ensuring the coordination between the electromagnetic touch screen and the electromagnetic stylus. Or the widths of the above-mentioned induction coils are set according to the size of the actual product, which will not be elaborated here.

[0080] Furthermore, in the embodiments of the present application, when setting the above-mentioned electromagnetic induction coils, the induction coils can also be bent according to the setting surface of the product. For example, in the direction corresponding to the rows of the substrate, the first receiving coil and the transmitting coil are bent to form a plurality of "concave" or "convex" shapes. Specifically, such as Figure 2CSchematic diagram of the structure of the electromagnetic induction coil therein. In the embodiments of the present application, in the directions corresponding to X and Y, the receiving coils are arranged at equal intervals. For example, the first receiving coil 312 includes coil X1, coil X2, and coil X3, and the second receiving coil 313 includes coil Y1, coil Y2, and coil Y3. By arranging the coils in parallel at equal intervals in the corresponding directions, the number of turns of the coil is further increased, thereby improving the induction effect of the coil. Preferably, the coil can also be set to n turns, such as coil Xn and Yn. And continue to set down according to the arrangement rules of coil X1, coil X2, coil X3, coil Y1, coil Y2, and coil Y3. And a transmitting coil is arranged outside each receiving coil. And when setting the above coils, according to requirements, the adjacent coils can be made not to overlap, or partially overlap.

[0081] Further, as Figure 3 and Figure 4 shown, Figure 3 is a schematic diagram of the working principle of the transmitting coil provided in the embodiments of the present application, Figure 4 is a schematic diagram of the working principle of the first receiving coil provided in the embodiments of the present application. In the embodiments of the present application, the electromagnetic coil is arranged according to the embodiments of the present application, and drive signals are respectively provided to the transmitting coil and the first receiving coil through the control chip. Among them, in the embodiments of the present application, the transmitting coil and the first receiving coil do not work simultaneously.

[0082] Specifically, first, the control chip provides a control signal to the transmitting coil 311 from the first input end 210, such as inputting a drive current into the transmitting coil. In the embodiments of the present application, the control signal can be a continuous control signal or a periodic control signal.

[0083] When the transmitting coil 311 receives the control signal T1, an induced first magnetic field 321 will be generated in the transmitting coil 311, as Figure 3 shown by the dotted circular first magnetic field in. At this time, the transmitting coil 311 is equivalent to a power generator. At this time, the stylus will be charged under the action of the first magnetic field 321. In the embodiments of the present application, during the process of the transmitting coil 311 emitting a signal, the stylus can be charged at any position in the area where the electromagnetic touch screen is located. Preferably, when the stylus is located at the center position of the electromagnetic touch screen, it is ensured that the emission power of the transmitting coil 311 can still meet the charging power of the stylus, so as to ensure the charging effect of the transmitting coil on the stylus.

[0084] See Figure 4 , when the stylus 333 is fully charged under the action of the transmitting coil, the stylus 333 is used to touch and discharge the electromagnetic touch screen. At this time, a second magnetic field 322 will be generated in the stylus, asFigure 4 As shown by the dashed circle in [reference], since the first receiving coil 312 is provided in the electromagnetic touch screen, at this time, the first receiving coil 312 and the second receiving coil 313 will generate an induced electric field under the action of the second magnetic field 322, and then a received control signal will be formed in the first receiving coil 312. The received signal acts on the control chip from the output terminal 310 of the first receiving coil 312, and then the touch point of the stylus is obtained according to the received signal, and the touch operation of the electromagnetic touch screen is realized.

[0085] In the embodiment of the present application, when the electromagnetic touch screen works, it may include a transmission stage and a reception and recognition stage; within the time sequences corresponding to the transmission stage and the reception and recognition stage, the control chip is used to provide a continuous or periodic control signal to the transmission coil, and the transmission coil is used to form a first induced magnetic field and transmit a control signal. This stage is mainly used to charge the stylus.

[0086] Within the time sequence corresponding to the reception and recognition stage, the stylus discharges and forms a second induced magnetic field, the receiving coil scans row by row, and the receiving coil receives a control signal in the second induced magnetic field. The control chip is used to determine the touch point according to the control signal received by the receiving coil and complete the touch operation.

[0087] Further, as shown in Figure 5 and Figure 6 、 Figure 7 shown, Figure 5 is the timing diagram corresponding to the electromagnetic drive in the traditional electromagnetic touch screen, Figures 6 - 7 is the electromagnetic drive timing diagram corresponding to the electromagnetic coil provided in the embodiment of the present application. Among them, Figure 6 the transmission coil is a continuous timing signal, while Figure 7 the transmission coil in [reference] is a periodic timing signal.

[0088] Specifically, in the traditional touch electromagnetic induction coil, each induction coil will generate a transmission signal and also a reception signal during the entire touch process. For example, for induction coils X1 and X2, during the touch process, within the time period t = a, the induction coil X1 first generates a transmission signal to charge the stylus through the transmission signal, and within the time period t = c, the induction coil X1 will also generate a reception signal to realize the control of the touch screen.

[0089] In the embodiment of the present application, for details, see Figure 6In this embodiment of the present application, the electromagnetic induction coil includes a transmitting coil X0, a first receiving coil X1, and a first receiving coil X2. At this time, when performing a touch operation on it, the transmitting coil X0 first generates a transmission signal, charges the stylus through the transmission signal, and after the charging is completed, a corresponding reception signal is formed through the first receiving coil X1 and the first receiving coil X2, thereby realizing the control of the touch screen and the positioning of the points.

[0090] Therefore, in this embodiment of the present application, the transmission signal and the reception signal are respectively realized through different electromagnetic coils, thereby effectively improving the touch effect of the electromagnetic touch screen of the touch pen and effectively improving the reporting point accuracy of the touch.

[0091] Combined with Figures 5 - 7 , in the process of traditional passive electromagnetic pen touch operation, when driving the electromagnetic coil in the touch screen, each drive needs to give a transmission signal and a reception signal on the same coil. Assuming that the electromagnetic coil has N channels, where each transmission takes time t = a, the reception takes t = c, and the channel switching time t = b, then the total time T required for one positioning time is T=(a + c + 2b)*2*N.

[0092] For Figure 6 in this embodiment of the present application, when the transmitting coil is a full-time sequential signal, the corresponding one positioning time T1=(c + b)*2*N. At this time, when touching the panel, the transmitting coil continuously emits signals within the touch timing period, and the corresponding receiving coil periodically receives signals at intervals within the touch timing period.

[0093] For Figure 7 in this embodiment of the present application, when the transmitting coil is a periodically alternating sequential signal, the corresponding one positioning time T2=(c + a)*2*N. At this time, when touching the panel, the transmitting coil X0 periodically emits signals within the touch timing period, and at the same time, the receiving coil X1 and the receiving coil X2 only receive signals within the non-touch timing period, thereby effectively shortening the working time.

[0094] Therefore, in this embodiment of the present application, the positioning time is shorter than that of the traditional touch screen, so that the touch sensitivity and touch effect of the touch screen are better.

[0095] Among them, the electromagnetic touch screen further includes a light emitting device layer. Specifically, a plurality of light emitting units are arranged in an array on the light emitting device layer. Combined with Figure 2B the arrangement structure in , in this embodiment of the present application, the light emitting device layer can be arranged on the substrate, and at the same time, the light emitting device layer covers the first electromagnetic coil and the second electromagnetic coil.

[0096] Furthermore, asFigure 8 As shown Figure 8 This is a schematic plan view of the electromagnetic touch control device provided by the embodiment of the present application. For details, see Figure 8 , the touch control device includes a transmitting coil 311 and a receiving coil 31. Among them, the receiving coil 31 includes a first receiving coil 312 arranged in the X direction and a second receiving coil 313 arranged in the Y direction. At the same time, a transmitting coil 311 is arranged around the receiving coil. Specifically, in each transmitting coil 311, multiple turns of the first receiving coil 312 and the second receiving coil 313 are arranged. The above coils are only examples. When setting the transmitting coil 311 and the first receiving coil 312, they are set according to the structure in the above embodiment, which will not be elaborated here.

[0097] In the embodiment of the present application, at least one light-emitting unit can be arranged in each electromagnetic coil, that is, each electromagnetic coil is arranged around multiple light-emitting units, and a light-emitting device can be arranged in the corresponding light-emitting unit, so as to realize touch operations in different areas.

[0098] In the embodiment of the present application, when setting the transmitting coil 311 and the receiving coil 31, they can be laid along different rows and columns, and at least two rows or two columns of light-emitting units can be included in each turn of the transmitting coil 311 and the receiving coil 31. Specifically, when laying, if the input end or output end corresponding to the first electromagnetic coil is set at different positions of the device, and the loop structure provided in the embodiment of the present application is formed.

[0099] Further, as Figure 9 shown Figure 9 This is a schematic structural view of an electromagnetic touch control device provided by the embodiment of the present application. In the embodiment of the present application, the electromagnetic touch control device includes an electromagnetic touch screen and a corresponding touch pen. By matching the electromagnetic touch screen with the touch pen, a better touch effect can be achieved.

[0100] Specifically, the electromagnetic touch control device further includes a control unit, a transmitting unit, a sensing unit, and a receiving unit.

[0101] Specifically, the control unit includes a detection circuit, a filtering circuit, a selection circuit, and a control circuit. Among them, the selection circuit is electrically connected to the receiving circuit, and the selection circuit is used to receive the control signal transmitted by the receiving circuit. The detection circuit is connected to the selection circuit, and the detection circuit is used to detect the induction signal transmitted by the selection circuit. The filtering circuit is connected to the detection circuit, and the filtering circuit is used to filter the detected induction signal and obtain an available induction signal. At the same time, the control circuit is connected to the filtering circuit, and the control circuit is used to receive the available induction signal and obtain the position of the touch pen according to the available induction signal.

[0102] In the embodiments of the present application, the control unit is used to transmit and receive control signals, provide a transmission signal to the transmission coil according to the touch signal, and provide a reception signal to the reception coil. The transmission unit is used to receive the control signal transmitted by the control circuit in the control unit. Meanwhile, a transmission coil and a reception coil are arranged in the induction unit, and each induction coil is used to receive the control signal transmitted by the transmission unit. When the stylus touches, the transmission coil is used to transmit a signal and form a first magnetic field, and the first magnetic field is used to charge the stylus. Meanwhile, the reception coil forms a reception signal according to the stylus.

[0103] In the embodiments of the present application, the induction unit can be an electromagnetic touch screen, and a transmission coil, a first reception coil and a second reception coil are correspondingly arranged in the induction unit. Among them, each coil is set according to the structure in the embodiments of the present application, which will not be elaborated here.

[0104] Further, the reception unit in the embodiments of the present application is used to receive the induction signal of the induction unit and transmit the induction signal to the control unit. The reception unit can include a first reception circuit and a second reception circuit. Among them, the first reception circuit can be correspondingly electrically connected to the first reception coil, and the second reception circuit is correspondingly electrically connected to the second reception coil.

[0105] See Figure 10 as shown in Figure 10 a method for touch point induction provided in the embodiments of the present application. When touching the electromagnetic touch device, the following steps are included:

[0106] S100: Provide the electromagnetic touch screen and the electromagnetic touch device in the embodiments of the present application;

[0107] S101: Use the control unit to provide control signals to the transmission coil and the reception coil in the electromagnetic touch screen. The transmission coil generates a transmission signal according to the control signal and forms a first magnetic field;

[0108] S102: The stylus in the electromagnetic touch device is charged under the action of the first magnetic field;

[0109] S103: After the charging is completed, use the stylus to perform a touch operation on the electromagnetic touch screen;

[0110] S104: During the touch operation, the reception coil in the induction unit forms a reception signal according to the second magnetic field in the stylus;

[0111] S105: Use the reception unit to receive the reception signal and process the reception signal to finally obtain the touch position of the stylus.

[0112] Specifically, in combination withFigures 6 - 7 In the timing control diagram in [reference], when a touch operation is performed, the touch chip first transmits a transmission signal to the electromagnetic coil, causing the transmission coil to form a corresponding transmission signal, and charging the stylus through the transmission signal.

[0113] After charging is completed, the electromagnetic touch screen is touched with the stylus. During the touch operation, the first receiving coil and the second receiving coil in the sensing unit form a received signal according to the magnetic field in the stylus. The receiving unit receives the above-mentioned received signal and processes the received signal.

[0114] In the embodiment of the present application, when the transmission coil generates a corresponding reflection signal, the control chip periodically or continuously provides a control signal to the electromagnetic coil. And during the touch operation, the receiving coil forms a corresponding electrical signal according to the magnetic field in the stylus, and thus forms the received signal according to the electrical signal. Then the received signal is processed again, and finally the touch point of the stylus is obtained. Further, when different driving voltages are provided to the above-mentioned first receiving coils, the voltage values of the driving voltages provided on each first receiving coil may be the same, or different driving voltages are provided to different first receiving coils. For example, the driving voltage on some first receiving coils is greater than the driving voltage on the remaining first receiving coils, and multiple different receiving coils can be scanned, so as to adjust the touch performance of the stylus and the touch screen by providing different driving voltages to different first receiving coils, and ensure its touch effect and accuracy.

[0115] In the embodiment of the present application, the transmission signal and the received signal in the circuit are respectively formed by different electromagnetic coils, so the problem that the transmission signal and the received signal are both generated by the same electromagnetic coil in the prior art is effectively improved, thereby improving the sensing accuracy of its touch point position, effectively reducing the sensing time, and effectively improving the touch performance and comprehensive performance of the electromagnetic touch device.

[0116] Among them, the electromagnetic touch device can be any product or component with a display function and a touch function, such as a mobile phone, a computer, an electronic paper, a display, a laptop computer, a digital photo frame, etc., and its specific type is not specifically limited.

[0117] In summary, the above has introduced in detail an electromagnetic touch screen, a touch device and a touch point sensing method provided by the embodiments of the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present invention; although the present invention is disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is based on the scope defined by the claims.

Claims

1. An electromagnetic touch screen, characterized in that, Comprising: A substrate; A transmitting coil, which is disposed on the substrate; And A receiving coil, which is disposed on the substrate; Wherein, the transmitting coil is correspondingly disposed within the peripheral area around the receiving coil, and the transmitting coil is used for transmitting a control signal, and the receiving coil is used for receiving the control signal; The electromagnetic touch screen further includes a sensing layer and a light-emitting device layer. The sensing layer includes a first sensing layer and a second sensing layer. The first sensing layer is disposed on the substrate, the second sensing layer is disposed on the first sensing layer, and the light-emitting device layer is disposed on the second sensing layer. The transmitting coil is disposed in the first sensing layer, and the receiving coil is disposed in the second sensing layer; the width of the trace of the transmitting coil is greater than the width of the trace of the receiving coil.

2. The electromagnetic touch screen according to claim 1, wherein The electromagnetic touch screen includes a display area and a non-display area disposed on at least one side of the display area; Wherein, multiple turns of the transmitting coil and multiple turns of the receiving coil are at least correspondingly disposed within the display area; Wherein, the number of the transmitting coils is less than the number of the receiving coils.

3. The electromagnetic touch screen according to claim 2, wherein The number of the transmitting coils is greater than 1 and less than 4.

4. The electromagnetic touch screen according to claim 2, characterized in that, The distance between adjacent two turns of the transmitting coil is set to be 1 mm - 10 mm, and the distance between adjacent two turns of the receiving coil is set to be 1 mm - 10 mm.

5. The electromagnetic touch screen according to claim 1, characterized in that, The ratio of the trace width of the transmitting coil to the trace width of the receiving coil is 5 - 20.

6. The electromagnetic touch screen according to any one of claims 1-5, characterized in that The receiving coil includes a first receiving coil and a second receiving coil; Wherein, the first receiving coil and the second receiving coil are disposed in different planes, and the orthographic projection of the first receiving coil on the substrate is perpendicular to the orthographic projection of the second receiving coil on the substrate.

7. The electromagnetic touch screen according to claim 1, wherein The electromagnetic touch screen further includes a control chip, which is disposed on the substrate. The control chip is used for providing a transmitting or receiving control signal to the transmitting coil and the receiving coil, and both ends of the transmitting coil are electrically connected to the control chip, and both ends of the receiving coil are electrically connected to the control chip.

8. The electromagnetic touch screen according to claim 7, characterized in that, The electromagnetic touch screen includes a transmitting stage and a receiving and identifying stage; Wherein, within the time sequence corresponding to the transmitting stage and the receiving and identifying stage, the control chip is used for providing a continuous or periodic control signal to the transmitting coil. The transmitting coil is used for forming a first induction magnetic field and transmitting a control signal, and charging the stylus; Within the time sequence corresponding to the receiving and identifying stage, the stylus discharges and forms a second induction magnetic field. The receiving coil performs a row-by-row scan, and the receiving coil receives the control signal in the second induction magnetic field. The control chip is used for determining the touch position according to the control signal.

9. An electromagnetic touch control device, comprising an electromagnetic touch screen, characterized in that, The electromagnetic touch device includes the electromagnetic touch screen according to any one of claims 1 to 8. The electromagnetic touch device further includes: A control unit, which receives a touch signal, and according to the touch signal, provides a transmitting signal to the transmitting coil within the electromagnetic touch screen, and provides a receiving signal to the receiving coil within the electromagnetic touch screen; A transmitting unit, which receives the control signal transmitted by the control unit; An induction unit, the induction unit includes a transmitting coil and a receiving coil, the transmitting coil is used to transmit a signal and form a first magnetic field, the first magnetic field is used to charge the stylus, and at the same time, the receiving coil forms a received signal according to the stylus; and, A receiving unit, the receiving unit is used to receive the received signal of the induction unit and transmit the received signal to the control unit, and the control unit is used to judge the position of the stylus according to the received signal.

10. The electromagnetic touch control device according to claim 9, wherein The control unit further includes: A selection circuit, the selection circuit is electrically connected to the induction unit, and the selection circuit is used to receive the received signal in the induction unit; A detection circuit, the detection circuit is connected to the selection circuit, and the detection circuit is used to detect the received signal transmitted by the selection circuit; A filtering circuit, the filtering circuit is connected to the detection circuit, and the filtering circuit is used to filter the detected received signal and obtain an available induction signal; and, A control circuit, the control circuit is connected to the filtering circuit, and the control circuit is used to receive the available induction signal and obtain the position of the stylus according to the available induction signal.

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