Electromagnetic touch device, electromagnetic touch method and electronic equipment

Abstract

The invention relates to the technical field of electromagnetic touch, and discloses an electromagnetic touch device, an electromagnetic touch method and electronic equipment, and the device comprises an antenna board which is provided with an antenna in a first direction and an antenna in a second direction; the control processing unit is used for controlling the first antenna and the Mth antenna of M adjacent antennas in the first direction or the second direction to serve as first scanning coils and sequentially scanning multiple sets of preset first scanning coils to obtain first coordinate data. After the first coordinate data is obtained, the first antenna and the Nth antenna of the adjacent N antennas are intermittently controlled to serve as second scanning coils, and multiple sets of preset second scanning coils are sequentially scanned to obtain second coordinate data; and the control processing unit is also used for obtaining track coordinates of the electromagnetic pen on the antenna plate according to the first coordinate data and the second coordinate data. According to the method, the obtained track coordinates can meet the precision requirement and the linearity requirement.

Description

Technical Field

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

[0002] An electromagnetic touch control device is a handwriting input technology based on the principle of electromagnetic induction. The electromagnetic touch control device includes an antenna board and an electromagnetic pen. The antenna board is provided with electromagnetic induction coils, and a resonant circuit is arranged inside the electromagnetic pen. When the electromagnetic pen approaches or touches the antenna board, an electromagnetic induction signal will be generated in the electromagnetic induction coils. Based on the electromagnetic induction signal, the touch coordinates and movement trajectory of the electromagnetic pen on the antenna board can be determined.

[0003] The accuracy and linearity of electromagnetic pen touch detection directly affect the smoothness and accuracy of a user writing on the antenna board with the electromagnetic pen, and also affect the input efficiency and user experience of the user using the electromagnetic pen. Improving accuracy and linearity is the development trend of handwriting input technology. However, as electromagnetic touch screens are becoming thinner and lighter, accuracy and linearity have become two mutually exclusive indicators. If relatively sparse electromagnetic induction coils are arranged on the antenna board, the accuracy will increase while the linearity will decrease; if relatively dense electromagnetic induction coils are arranged on the antenna board, the linearity will increase while the accuracy will decrease. For the same antenna board, it is difficult to balance the density of the electromagnetic induction coils. While improving the linearity, the accuracy of the antenna board will decrease. If accuracy is pursued, linearity will be sacrificed. The existing technologies cannot achieve the optimal effects for both linearity and accuracy. Summary of the Invention

[0004] In view of this, the present invention provides an electromagnetic touch control device, an electromagnetic touch control method and an electronic device, which improve the problem that the linearity and accuracy of electromagnetic touch control input technology cannot be balanced, so that the two performance indicators of linearity and accuracy of electromagnetic touch control input can reach relatively good or even optimal effects at the same time.

[0005] In a first aspect, the present invention provides an electromagnetic touch control device, including: an antenna board, on which antennas in a first direction and antennas in a second direction are provided. The antennas in the first direction and the antennas in the second direction are respectively combined in pairs with a preset number of antennas spaced apart to form coils in the first direction and coils in the second direction. The coils in the first direction and the coils in the second direction are multiplexed as transmitting coils and receiving coils. The transmitting coils are used to transmit electromagnetic waves to an electromagnetic pen, and at the same time serve as receiving coils to receive resonance signals generated after the electromagnetic pen resonates with the electromagnetic waves transmitted by the transmitting coils; a control processing unit, configured to control the first antenna and the Mth antenna among M adjacent antennas in the first direction or the second direction as a first scanning coil and sequentially scan a preset number of groups of first scanning coils to obtain first coordinate data, and is further configured to intermittently control the first antenna and the Nth antenna among N adjacent antennas as a second scanning coil and sequentially scan a preset number of groups of second scanning coils to obtain second coordinate data after obtaining the first coordinate data, where M and N are positive integers, M > 3, and N > M; the control processing unit is further configured to obtain the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data.

[0006] For the electromagnetic touch control device provided in this embodiment, the antennas on the antenna board are multiplexed as transmitting coils and receiving coils. The first antenna and the Mth antenna among M adjacent antennas in each direction are controlled as a first scanning coil, and the first antenna and the Nth antenna among N adjacent antennas are controlled as a second scanning coil. A preset number of groups of first scanning coils are sequentially scanned to obtain first coordinate data, and then a preset number of groups of second scanning coils are sequentially scanned to obtain second coordinate data. All scans in the first direction and the second direction of the antenna board are completed according to a combination of sequential scanning and alternating scanning, obtaining the first coordinate data of all preset groups of first scanning coils and the second coordinate data of the preset groups of second scanning coils. The touch trajectory of the electromagnetic pen is obtained according to the first coordinate data and the second coordinate data. In this embodiment, first, the first coordinate data with better linearity is determined through the first scanning method with a smaller scanning pitch, then the second coordinate data with higher accuracy is determined through the second scanning method with a larger scanning pitch, and finally the touch coordinates are jointly determined based on the first coordinate data and the second coordinate data, enabling the finally obtained touch coordinates to meet both the accuracy requirements and the linearity requirements. Especially for the detection of the inclination angle of the electromagnetic pen, both the accuracy and the linearity are synchronously improved and optimized.

[0007] In an optional implementation manner, M = 4 and N = 7.

[0008] In an optional implementation manner, the preset number of groups of first scanning coils is seven groups, nine groups, or eleven groups, and the preset number of groups of second scanning coils is at least three groups.

[0009] In an alternative embodiment, intermittently controlling the first antenna and the Nth antenna among adjacent N antennas as a second scanning coil and sequentially scanning a preset number of groups of second scanning coils includes: sequentially scanning a preset number of groups of first scanning coils at least continuously twice and then performing one sequential scan of a preset number of groups of second scanning coils until the scanning of the first scanning coils and the second scanning coils in the first direction and the second direction is completed.

[0010] In an alternative embodiment, the scanning includes: controlling a preset number of groups of first scanning coils as transmitting coils to sequentially transmit electromagnetic waves to the electromagnetic pen and then controlling the preset number of groups of first scanning coils as receiving coils to sequentially receive the generated resonance signals; controlling a preset number of groups of second scanning coils as transmitting coils to sequentially transmit electromagnetic waves to the electromagnetic pen and then controlling the preset number of groups of second scanning coils as receiving coils to sequentially receive the generated resonance signals.

[0011] In an alternative embodiment, obtaining the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data includes: calibrating the first coordinate data according to the second coordinate data.

[0012] In this embodiment, after determining the first coordinate data and the second coordinate data, determining the coordinate offset coefficient based on the ratio of the theoretical touch coordinate and the measured touch coordinate, and then determining the touch coordinate based on the coordinate offset coefficient, the first coordinate data, and the second coordinate data can calibrate the coordinate offset error caused by the inclination of the electromagnetic pen relative to the antenna board, improve the accuracy of the finally determined touch coordinate, and thereby enhance the user experience.

[0013] In a second aspect, the present invention provides an electromagnetic touch method, which is applied to the control processing unit of the electromagnetic touch device in the first aspect or any corresponding embodiment thereof. The electromagnetic touch method includes: controlling the first antenna and the Mth antenna among adjacent M antennas in the first direction or the second direction as a first scanning coil and sequentially scanning a preset number of groups of first scanning coils to obtain first coordinate data; intermittently controlling the first antenna and the Nth antenna among adjacent N antennas as a second scanning coil and sequentially scanning a preset number of groups of second scanning coils to obtain second coordinate data; obtaining the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data.

[0014] In an alternative embodiment, intermittently controlling the first antenna and the Nth antenna among adjacent N antennas as a second scanning coil and sequentially scanning a preset number of groups of second scanning coils includes: sequentially scanning a preset number of groups of first scanning coils at least continuously twice and then performing one sequential scan of a preset number of groups of second scanning coils until the scanning of the first scanning coils and the second scanning coils in the first direction and the second direction is completed.

[0015] In an alternative embodiment, the preset multiple groups of first scanning coils are seven groups, the preset multiple groups of second scanning coils are at least three groups, and the distance between the starting antennas in the second scanning coils is one antenna wiring distance more than the distance between the starting antennas in the first scanning coils.

[0016] In a third aspect, the present invention provides an electronic device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the electromagnetic touch method according to the first aspect or any corresponding embodiment thereof by executing the computer instructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of an electromagnetic touch device according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the distribution position of the first antenna according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the distribution position of the second antenna according to an embodiment of the present invention;

[0021] Figure 4 is a schematic flowchart of an electromagnetic touch method according to an embodiment of the present invention;

[0022] Figure 5 is a schematic flowchart of another electromagnetic touch method according to an embodiment of the present invention;

[0023] Figure 6 is a schematic flowchart of yet another electromagnetic touch method according to an embodiment of the present invention;

[0024] Figure 7 is a schematic structural diagram of another electromagnetic touch device according to an embodiment of the present invention.

[0025] Reference numerals: 110, antenna board; 111, first antenna; 112, second antenna; 120, control and processing unit; 121, logic control section; 122, transmitting section; 123, receiving section; 124, microprocessor; 130, first selector; 140, second selector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The electromagnetic touch control method provided by the present invention can be applied to the control processing unit of an electromagnetic touch control device. The electromagnetic touch control device can be an e-book, a handwriting computer, a mobile phone, etc. The control processing unit can be a microcontroller unit (MCU) or other controllers.

[0028] To facilitate the understanding of the electromagnetic touch control method provided by the present invention, the basic structure of the electromagnetic touch control device will be described first with reference to the accompanying drawings.

[0029] As Figure 1 shown, the electromagnetic touch control device includes an antenna board 110 and a control processing unit 120. The antenna board 110 includes antennas in a first direction and antennas in a second direction. The antennas in the first direction and the antennas in the second direction are respectively combined in pairs at preset intervals to form coils in the first direction and coils in the second direction. The coils in the first direction and the coils in the second direction are multiplexed as transmitting coils and receiving coils. The transmitting coils are used to send electromagnetic waves to the electromagnetic pen, and at the same time, serve as receiving coils to receive the resonance signals generated after the electromagnetic pen resonates with the electromagnetic waves sent by the transmitting coils. The control processing unit 120 is a touch control chip.

[0030] Among them, the first direction and the second direction intersect with each other. The number of antennas in the first direction and the number of antennas in the second direction can be the same or different. The preset interval can be configured by designers according to requirements. For the convenience of distinction, the antennas in the first direction will be referred to as first antennas 111 hereinafter, and the antennas in the second direction will be referred to as second antennas 112.

[0031] Figure 1 Taking the first direction as the vertical direction and the second direction as the horizontal direction, and multiple first antennas 111 and multiple second antennas 112 being perpendicularly arranged as an example, but not limited thereto.

[0032] In other embodiments, the first direction can also be the horizontal direction, and the second direction can be the vertical direction.

[0033] Exemplarily, as Figure 1 and Figure 2As shown, multiple first antennas 111 are electrically connected at one end in the first direction, and the other end of the multiple first antennas 111 in the first direction is connected to the control processing unit 120 through the first selector 130. That is, one end of the multiple first antennas 111 is short-circuited through the antenna, and the other end is connected to the first selector 130. The multiple first antennas 111 are gated through the first selector to form multiple transmitting coils or multiple receiving coils. In Figure 2 X1 to X n represent multiple first antennas 111.

[0034] The first selector 130 integrates multiple switching devices inside. By controlling the on / off states (conducting or turning off) of the corresponding switching devices, the conduction state or the off state can be achieved between specific two first antennas. The first selector 130 turns on a group of coils each time. The first selector 130 can be a chip integrating analog switches.

[0035] For example, the first selector 130 can make the other ends of the first first antenna and the third first antenna in a conducting state through the switching device, so that the first first antenna and the third first antenna form a coil.

[0036] As Figure 1 and Figure 3 shown, multiple second antennas 112 are electrically connected at one end in the second direction, and the other end of the multiple second antennas 112 in the second direction is connected to the control processing unit 120 through the second selector 140. That is, one end of the multiple second antennas 112 is short-circuited through the antenna, and the other end is connected to the second selector 140. The multiple second antennas 112 are gated through the second selector 140 to form multiple coils. In Figure 2 Y1 to Y m represent multiple second antennas 112.

[0037] The second selector 140 can have the same structure as the first selector 130. The second selector 140 turns on a group of coils each time. The second selector 140 can also be a chip integrating analog switches.

[0038] For example, the second selector 140 can make the other ends of the first second antenna and the third second antenna in a conducting state through the switching device, so that the first second antenna and the third second antenna form a coil.

[0039] It should be understood that Figure 1The distribution of the multiple first antennas 111 and the multiple second antennas 112 shown in a vertically intersecting form under the glass cover plate is only an exemplary illustration. Among them, the multiple first antennas 111 are distributed in the same plane (denoted as the first plane), and the multiple second antennas 112 are distributed in another plane (denoted as the second plane). The two planes (i.e., the first plane and the second plane) are stacked up and down so that the first antennas 111 and the second antennas 112 are arranged in a crossed manner and are located under the glass cover plate.

[0040] Currently, generally, two of the three adjacent first antennas form a transmitting coil or a receiving coil, and two of the three adjacent second antennas form a transmitting coil or a receiving coil. The process for the control processing unit to determine the touch coordinates of the electromagnetic pen on the antenna board 110 is generally as follows: Control the transmitting coil formed by the first antennas to emit an excitation signal (i.e., an electromagnetic wave). When the electromagnetic pen with a resonant circuit approaches or is on the antenna board, the resonant circuit in the electromagnetic pen generates an electromagnetic signal after being excited by the excitation signal. After the transmitting coil formed by the first antennas emits the excitation signal, it forms a receiving coil to receive the generated electromagnetic signal and transmits it to the control processing unit 120. By repeating the above process, the control processing unit can obtain multiple electromagnetic signals. Then, the control processing unit can determine the coordinates of the electromagnetic pen in the horizontal direction according to the changes in the multiple electromagnetic signals.

[0041] Meanwhile, the control processing unit also controls the transmitting coil formed by the second antennas to emit an excitation signal and receives the electromagnetic signal detected by the receiving coil formed by the second antennas. Then, based on the changes in the multiple electromagnetic signals, it determines the coordinates of the electromagnetic pen in the vertical direction, and further obtains the touch coordinates of the electromagnetic pen on the antenna board.

[0042] For the electromagnetic touch positioning technology, accuracy and linearity are two important indicators reflecting the accuracy of coordinate recognition. When performing coordinate recognition in the above manner, it is difficult to balance accuracy and linearity, especially when the thickness of the electromagnetic touch device is relatively thin.

[0043] Among them, accuracy refers to the degree of deviation between the touch coordinates determined when the electromagnetic pen is perpendicular to the antenna board and the touch coordinates determined when the electromagnetic pen is not perpendicular to the antenna board. The electromagnetic pen being perpendicular to the antenna board means that the angle between the electromagnetic pen and the plane where the antenna board is located is 90°, and the electromagnetic pen not being perpendicular to the antenna board means that the angle between the electromagnetic pen and the plane where the antenna board is located is less than or greater than 90°.

[0044] Linearity refers to the accuracy of the linear relationship between the output signal (such as the movement trajectory of the electromagnetic pen determined by the control processing unit) and the input signal (the actual movement trajectory of the electromagnetic pen). For example, when the user uses the electromagnetic pen to draw a straight line on the antenna board, if the linearity is good, a trajectory close to a straight line will appear on the antenna board; if the linearity is poor, the trajectory presented on the antenna board may be curved, jittery or discontinuous, and the straightness of the trajectory is poor.

[0045] Specifically, when there are more transmitting coils and receiving coils arranged on the antenna board, it means there are more detection points, enabling the control processing unit to more accurately sense the position change of the electromagnetic pen, thereby more delicately capturing the movement trajectory of the electromagnetic pen and improving linearity. It also means that the signal interference between the coils increases, resulting in a decrease in accuracy. That is, for the same antenna board, it is difficult to achieve the optimal effects for both linearity and accuracy.

[0046] In view of this, the present invention provides an electromagnetic touch control method. By combining scanning in a smaller scanning area and a larger scanning area, first, a set of coordinate data with better linearity is obtained through scanning in the smaller scanning area, and then the scanning area is increased. The first set of coordinate data is calibrated with the second set of coordinate data determined through scanning in the larger scanning area, improving the accuracy of coordinate recognition, so that the finally obtained touch coordinates can meet both the accuracy requirements and the linearity requirements.

[0047] According to an embodiment of the present invention, an embodiment of an electromagnetic touch control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in the control processing unit, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0048] In this embodiment, an electromagnetic touch control method is provided, which can be used for the above-mentioned control processing unit 120. Figure 4 It is a flowchart of an electromagnetic touch control method according to an embodiment of the present invention. As Figure 4 shown, the method includes the following steps:

[0049] Step S401, control the first antenna and the Mth antenna of M adjacent antennas in the first direction or the second direction as the first scanning coils and sequentially scan a preset number of groups of first scanning coils to obtain first coordinate data.

[0050] Among them, scanning refers to the process in which the first scanning coils first act as transmitting coils to send signals and then act as receiving coils to receive signals. Sequentially scanning a preset number of groups of first scanning coils includes: controlling a preset number of groups of first scanning coils to act as transmitting coils to sequentially send electromagnetic waves to the electromagnetic pen and then controlling a preset number of groups of first scanning coils to act as receiving coils to sequentially receive the generated resonance signals.

[0051] Specifically, the first scanning coil can be a coil formed by selecting and connecting the i-th first antenna and the (i + M - 1)-th first antenna, or the first scanning coil can also be a coil formed by selecting and connecting the j-th second antenna and the (j + M - 1)-th second antenna. M is a positive integer, M > 3. For example, M can be 4 or 5, etc. i and j are integers, and 1 ≤ i < i + M - 1 ≤ the number of first antennas, 1 ≤ j < j + M - 1 ≤ the number of second antennas. That is, in the first scanning mode, the first scanning coil is for X i and X i+M-1 to form a coil and Y j and Y j+M-1 to form a coil.

[0052] Taking Figure 1 as an example, the number of first scanning coils in the horizontal direction is determined based on the number of first antennas and M. For example, taking the number of first antennas as 9 and M = 4 as an example, the antenna board can include 6 groups of first scanning coils in the horizontal direction, which are the coils formed by X1 and X4, the coils formed by X2 and X5, the coils formed by X3 and X6, the coils formed by X4 and X7, the coils formed by X5 and X8, and the coils formed by X6 and X9 respectively.

[0053] The number of first scanning coils in the vertical direction is determined based on the number of second antennas and M. For example, taking the number of second antennas as 6 and M = 4 as an example, the antenna board includes 3 groups of first scanning coils in the vertical direction, which are the coils formed by Y1 and Y4, the coils formed by Y2 and Y5, and the coils formed by Y3 and Y6 respectively.

[0054] Exemplarily, the preset multiple groups of first scanning coils can be seven groups, nine groups, eleven groups, etc.

[0055] Specifically, the control processing unit can generate a voltage signal with a specified waveform. When determining the coordinates in the horizontal direction, the control processing unit controls the first selector to sequentially conduct multiple first scanning coils in the horizontal direction. The conducted first scanning coils receive the voltage signal with the specified waveform generated by the control processing unit through the first selector. The first scanning coils in the horizontal direction first act as transmitting coils to emit excitation signals (i.e., electromagnetic waves). After emitting the excitation signals, the first scanning coils no longer receive the voltage signal with the specified waveform, but act as receiving coils to receive the electromagnetic signals generated after the resonance of the resonance circuit inside the electromagnetic pen, and transmit the received electromagnetic signals to the control processing unit, so that the control processing unit obtains multiple first electromagnetic signals in the horizontal direction.

[0056] When determining the coordinates in the vertical direction, the control processing unit controls the second selector to sequentially conduct a plurality of first scanning coils in the vertical direction, so that the first scanning coils in the vertical direction also receive a voltage signal of a specified waveform to emit an excitation signal. After emitting the excitation signal, the first scanning coils act as receiving coils to receive electromagnetic signals, enabling the control processing unit to obtain a plurality of first electromagnetic signals in the vertical direction.

[0057] After obtaining a plurality of first electromagnetic signals, after processing the plurality of first electromagnetic signals in the horizontal direction, the coordinate value of the electromagnetic pen in the horizontal direction of the antenna board can be obtained. After processing the plurality of first electromagnetic signals in the vertical direction, the coordinate value of the electromagnetic pen in the vertical direction of the antenna board can be obtained, and then the first coordinate data can be obtained. Among them, the first coordinate data is the touch coordinate of the electromagnetic pen on the antenna board determined in the first scanning mode.

[0058] The method for determining the touch coordinates based on electromagnetic signals in the present invention is the same as that in the electromagnetic touch field, and will not be described in detail here.

[0059] In one example, the number of the first antennas is 9, the number of the second antennas is 6, M = 4, and the process of determining the first coordinate data in the first scanning mode can be as follows: The control processing unit controls the transmitting coil formed by X1 and X4 to emit an excitation signal. After the first preset time period, the coil formed by X1 and X4 no longer emits the excitation signal but acts as a receiving coil to detect electromagnetic signals. At this time, the control processing unit can receive the electromagnetic signals from the receiving coil formed by X1 and X4. After the second preset time period, the control processing unit controls the transmitting coil formed by X2 and X5 to emit an excitation signal. After the first preset time period, X2 and X5 act as receiving coils to detect electromagnetic signals. And so on, until X6 and X9 act as receiving coils to detect electromagnetic signals. At this time, the control processing unit can determine the coordinate value of the electromagnetic pen in the horizontal direction of the antenna board based on the plurality of electromagnetic signals in the horizontal direction.

[0060] At the same time, the control processing unit can also control the transmitting coil formed by Y1 and Y4 to emit an excitation signal. After the first preset time period, Y1 and Y4 act as receiving coils to detect electromagnetic signals, and the control processing unit can receive the electromagnetic signals from the receiving coil formed by Y1 and Y4. And so on, until Y3 and Y6 act as receiving coils to detect electromagnetic signals. At this time, the control processing unit can determine the coordinate value of the electromagnetic pen in the vertical direction of the antenna board based on the plurality of electromagnetic signals in the vertical direction, and then obtain the first coordinate data. Among them, the first preset time period and the second preset time period can be determined by designers according to application requirements.

[0061] Step S402: Intermittently control the first antenna and the Nth antenna among adjacent N antennas as the second scanning coils, and sequentially scan a preset number of groups of second scanning coils to obtain second coordinate data.

[0062] Specifically, the sequential scanning of the preset number of groups of second scanning coils includes: controlling the preset number of groups of second scanning coils as transmitting coils to sequentially send electromagnetic waves to the electromagnetic pen, and then controlling the preset number of groups of second scanning coils as receiving coils to sequentially receive the generated resonance signals.

[0063] Among them, the second scanning coil can be a coil formed by selecting the ith first antenna and the (i + N - 1)th first antenna, or a coil formed by the jth second antenna and the (j + N - 1)th second antenna. N is a positive integer, N > M. For example, N can be 7 or 9, etc., and 1 ≤ i < i + N - 1 ≤ the number of first antennas, 1 ≤ j < j + N - 1 ≤ the number of second antennas. That is, in the second scanning mode, the second scanning coil is formed by X i and X i+N-1 and a coil formed by Y j and Y j+N-1 formed.

[0064] The number of second scanning coils in the horizontal direction is determined based on the number of first antennas, M, and N. For example, taking the number of first antennas as 12, M = 4, and N = 7 as an example, the antenna board includes 6 groups of second scanning coils in the horizontal direction, which are the coils formed by X1 and X7, the coils formed by X2 and X8, the coils formed by X3 and X9, the coils formed by X4 and X 10 formed, the coils formed by X5 and X 11 formed, and the coils formed by X6 and X 12 formed.

[0065] The number of second scanning coils in the vertical direction is determined based on the number of second antennas, M, and N. For example, taking the number of second antennas as 9, M = 4, and N = 7 as an example, the antenna board includes 3 groups of second scanning coils in the vertical direction, which are the coils formed by Y1 and Y7, the coils formed by Y2 and Y8, and the coils formed by Y3 and Y9.

[0066] Exemplarily, the preset number of groups of second scanning coils is at least three groups.

[0067] Specifically, the control processing unit can generate a voltage signal with a specified waveform. When determining the coordinates in the horizontal direction, the control processing unit controls the first selector to sequentially conduct a plurality of second scanning coils in the horizontal direction. The conducted second scanning coils receive the voltage signal with the specified waveform generated by the control processing unit through the first selector, so that the second scanning coils in the horizontal direction first act as transmitting coils to emit excitation signals (i.e., electromagnetic waves). After that, the second scanning coils in the horizontal direction act as receiving coils to receive electromagnetic signals, enabling the control processing unit to obtain the second electromagnetic signals in the horizontal direction.

[0068] When determining the coordinates in the vertical direction, the control processing unit controls the second selector to sequentially conduct a plurality of second scanning coils in the vertical direction, so that the second scanning coils in the vertical direction act as transmitting coils to receive the voltage signal with the specified waveform and emit excitation signals. After the second scanning coils in the vertical direction emit the excitation signals, the second scanning coils act as receiving coils. If the electromagnetic pen approaches the antenna board, the resonant circuit inside the electromagnetic pen resonates to generate an electromagnetic signal, which can be received by the receiving coils on the antenna board and transmitted to the control processing unit, enabling the control processing unit to obtain a plurality of second electromagnetic signals.

[0069] After obtaining a plurality of second electromagnetic signals, after processing the plurality of second electromagnetic signals in the horizontal direction, the coordinate value of the electromagnetic pen in the horizontal direction of the antenna board can be obtained. After processing the plurality of second electromagnetic signals in the vertical direction, the coordinate value of the electromagnetic pen in the vertical direction of the antenna board can be obtained, and then the second coordinate data can be obtained. Among them, the second coordinate data is the touch coordinates of the electromagnetic pen on the antenna board determined in the second scanning mode.

[0070] The method for determining the touch coordinates based on electromagnetic signals in the present invention is the same as that in the electromagnetic touch field, and will not be described in detail here.

[0071] Compared with the first scanning mode, the interval between the two antennas in the second scanning mode is larger, that is, the scanning area is larger, and the accuracy of the finally determined touch coordinates will be better.

[0072] Among them, intermittent control means that when determining the touch coordinates of the electromagnetic pen, after performing a preset number of scans in the first scanning mode, the second scanning mode is added once. The preset number can be designed by the designer according to actual needs.

[0073] For example, after completing two or three scans in the first scanning mode, adding one second scanning mode. This intermittent control method can improve the accuracy and ensure the reporting rate. The reporting rate refers to the number of data points reported per second.

[0074] For another example, after completing one scan of the first scanning method, add one scan of the second scanning method. Then, after completing two scans of the first scanning method, add one scan of the second scanning method, as long as the reporting rate is ensured.

[0075] Step S403: Obtain the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data.

[0076] Exemplarily, the average value of the first coordinate data and the second coordinate data can be determined as the touch coordinate. Specifically, if the first coordinate data is (X1, Y1) and the second coordinate data is (X2, Y2), then the touch coordinate is

[0077] The electromagnetic touch method provided in this embodiment first controls the first antenna and the Mth antenna of M adjacent antennas in each direction as the first scanning coil, and sequentially scans a preset number of groups of the first scanning coils to obtain the first coordinate data. Then, it intermittently controls the first antenna and the Nth antenna of N adjacent antennas as the second scanning coil, and sequentially scans a preset number of groups of the second scanning coils to obtain the second coordinate data. Finally, according to the first coordinate data and the second coordinate data, the trajectory coordinates of the electromagnetic pen on the antenna board are obtained. In this embodiment, the first coordinate data with better linearity is first determined by the first scanning method with a smaller scanning interval, and then the second coordinate data with higher accuracy is determined by the second scanning method with a larger scanning interval. Finally, the touch coordinate is jointly determined based on the first coordinate data and the second coordinate data, so that the finally obtained touch coordinate can meet both the accuracy requirement and the linearity requirement. Especially for the detection of the inclination angle of the electromagnetic pen, both the accuracy and the linearity are synchronously improved and optimized.

[0078] In this embodiment, an electromagnetic touch method is provided, which can be used for the above control processing unit. Figure 5 It is a flowchart of another electromagnetic touch method according to an embodiment of the present invention. As Figure 5 shown, the method includes the following steps:

[0079] Step S501: Control the first antenna and the Mth antenna of M adjacent antennas in the first direction or the second direction as the first scanning coil and sequentially scan a preset number of groups of the first scanning coils to obtain the first coordinate data.

[0080] For details, please refer to Figure 4 Step S401 of the embodiment shown, which will not be elaborated here.

[0081] Step S502: After sequentially scanning a preset multiple groups of first scanning coils at least twice, then sequentially scanning a preset multiple groups of second scanning coils once until the scanning of the first and second scanning coils in the first direction and the second direction is completed, and second coordinate data is obtained.

[0082] Specifically, when the control processing unit determines the trajectory coordinates of the electromagnetic pen, it first sequentially scans a preset multiple groups of first scanning coils twice or three times, etc., and then sequentially scans a preset multiple groups of second scanning coils once. After completing the scanning in the first direction and the second direction in the second scanning mode, second coordinate data can be obtained.

[0083] Among them, the second scanning coil can be a coil formed by selecting the i-th first antenna and the (i + N - 1)-th first antenna, or the second scanning coil can be a coil formed by the j-th second antenna and the (j + N - 1)-th second antenna, where 1 ≤ i < i + N - 1 ≤ the number of first antennas, and 1 ≤ j < j + N - 1 ≤ the number of second antennas.

[0084] Exemplarily, the preset multiple groups of first scanning coils can be 7 groups, the preset multiple groups of second scanning coils can be at least three groups, and the spacing between the starting antennas in the second scanning coil is one antenna wiring distance more than the spacing between the starting antennas in the first scanning coil. For example, when M = 4 and N = 7, the multiple second scanning coils can be a coil formed by the 1st antenna and the 7th antenna, a coil formed by the 3rd antenna and the 9th antenna, and a coil formed by the 5th antenna and the 11th antenna. That is, i and j in the second scanning coil are not consecutive, i = 1, 3, 5, 7, etc.; j = 1, 3, 5, 7, etc.

[0085] Specifically, the first scanning mode can perform scanning with 7 groups of first scanning coils as the minimum scanning unit, and the second scanning mode can perform scanning with 3 groups of second scanning coils as the minimum scanning unit.

[0086] Step S503: Calibrate the first coordinate data according to the second coordinate data.

[0087] Exemplarily, the above step S503 may include step a1 and step a2:

[0088] Step a1: Determine the coordinate offset coefficient based on the ratio of the theoretical touch coordinates to the measured touch coordinates.

[0089] Specifically, the coordinate offset coefficient is the ratio of the theoretical touch coordinate to the measured touch coordinate. The theoretical touch coordinate can be the touch coordinate of the electromagnetic pen on the antenna board at a preset moment recorded manually, and the measured touch coordinate can be the touch coordinate of the electromagnetic pen on the antenna board determined by the control processing unit at the preset moment. The theoretical touch coordinate can be input into the control processing unit by the user through a human-computer interaction device (such as a mouse or keyboard). The preset moment can be the calibration moment, which can be configured by the designer.

[0090] Step a2: Determine the touch coordinate based on the coordinate offset coefficient, the first coordinate data, and the second coordinate data.

[0091] Specifically, based on the coordinate offset coefficient, the first coordinate data, and the second coordinate data, the touch coordinate can be determined by the following formula (1):

[0092]

[0093] Wherein, X and Y represent the touch coordinate, X1 and Y1 represent the first coordinate data, X2 and Y2 represent the second coordinate data, and K represents the coordinate offset coefficient.

[0094] Specifically, due to the different distances between the first scanning coil and the second scanning coil, the offset directions of the touch coordinates caused by the tilt of the electromagnetic pen are different. Therefore, the absolute value is used in the above formula (1) to describe the relationship between the touch coordinate and the coordinate offset coefficient.

[0095] The touch coordinate can be determined by formula (1) Or The touch coordinate can be determined by formula (1) Or

[0096] In the electromagnetic touch method provided in this embodiment, after determining the first coordinate data and the second coordinate data, the coordinate offset coefficient is determined based on the ratio of the theoretical touch coordinate to the measured touch coordinate, and then the touch coordinate is determined based on the coordinate offset coefficient, the first coordinate data, and the second coordinate data, which can calibrate the coordinate offset error caused by the tilt of the electromagnetic pen relative to the antenna board, improve the accuracy of the finally determined touch coordinate, and thus enhance the user experience.

[0097] Specifically, taking M = 4 and N = 7 as an example, the electromagnetic touch method provided by the present invention will be described in detail below.

[0098] As Figure 6As shown, after the antenna board of the electromagnetic touch device is turned on, initialization settings are first performed. For example, the hardware parameters and software parameters required for touch detection in the antenna board are configured. Then, it is determined whether there is an electromagnetic pen on the antenna board. It is possible to scan all coils to determine whether there is an electromagnetic pen, or it is also possible to determine whether there is an electromagnetic pen through a pressure sensor or other sensors.

[0099] When it is determined that there is an electromagnetic pen on the antenna board, the control processing unit executes the electromagnetic touch method provided by the present invention.

[0100] First, the control processing unit performs horizontal detection through the coil formed by X i and X i+3 and performs vertical detection through the coil formed by Y j and Y j+3 Then, based on the multiple first electromagnetic signals obtained from the detection, first coordinate data is determined.

[0101] Specifically, the control processing unit first controls the first scanning coil formed by X i and X i+3 to act as a transmitting coil to emit an excitation signal. After the first preset time period, X i and X i+3 act as receiving coils to receive the first electromagnetic signal in the horizontal direction. The control processing unit determines the coordinate value in the horizontal direction based on the multiple first electromagnetic signals in the horizontal direction. At the same time, the control processing unit controls the first scanning coil formed by Y j and Y j+3 to act as a transmitting coil to emit an excitation signal. After the first preset time period, Y j and Y j+3 act as receiving coils to receive the first electromagnetic signal in the vertical direction. The control processing unit determines the coordinate value in the vertical direction based on the multiple first electromagnetic signals in the vertical direction, and thus obtains the first coordinate data.

[0102] After that, the control processing unit performs horizontal detection through the second scanning coil formed by X i and X i+6 and performs vertical detection through the second scanning coil formed by Y j and Y j+6 Then, based on the multiple second electromagnetic signals obtained from the detection, second coordinate data is determined.

[0103] Specifically, the control processing unit first controls the second scanning coil formed by X i and X i+6 to act as a transmitting coil to emit an excitation signal. After the first preset time period, X i and X i+6As a receiving coil to receive the second electromagnetic signal in the horizontal direction, the control and processing unit determines the coordinate value in the horizontal direction based on the second electromagnetic signals in multiple horizontal directions. At the same time, the control and processing unit first controls Y j and Y j+6 The formed second scanning coil serves as a transmitting coil to emit an excitation signal. After the first preset time period, Y j and Y j+6 serve as receiving coils to receive the second electromagnetic signal in the vertical direction. The control and processing unit determines the coordinate value in the vertical direction based on the second electromagnetic signals in multiple vertical directions, and then obtains the second coordinate data.

[0104] Finally, the control and processing unit determines the touch coordinates of the electromagnetic pen on the antenna board based on the first coordinate data and the second coordinate data.

[0105] Optionally, the antenna board is divided into multiple scanning areas. For example, 3×3 scanning areas, 4×4 scanning areas, 4×6 scanning areas, or 6×6 scanning areas. The 3×3 scanning areas mean that there are 3 scanning areas in the horizontal direction of the antenna board (such as left, middle, and right), and there are 3 scanning areas in the vertical direction of the antenna board (such as upper, middle, and lower). Each scanning area corresponds to a scanning coil (such as the coil formed by two antennas at the edge).

[0106] At this time, the process of determining whether there is an electromagnetic pen on the antenna board can be: the scanning coil corresponding to each scanning area performs self-excitation and self-reception. If an electromagnetic signal can be received, it can be determined that there is an electromagnetic pen on the antenna board, and the initial position of the electromagnetic pen on the antenna board (such as upper left or lower left, etc.) can be determined. Among them, the scanning coil performing self-excitation and self-reception means that the scanning coil first serves as a transmitting coil to emit an excitation signal, and then serves as a receiving coil to detect the electromagnetic signal after the first preset time period.

[0107] Then, the control and processing unit executes the electromagnetic touch method provided by the present invention based on multiple first antennas and multiple second antennas within the initial position, improving the efficiency of touch detection.

[0108] The present invention also provides an electromagnetic touch device, as Figure 1 shown. The electromagnetic touch device includes an antenna board 110 and a control and processing unit 120.

[0109] Specifically, the control processing unit 120 is configured to control the first antenna and the Mth antenna of M adjacent antennas in the first direction or the second direction as the first scanning coils, and sequentially scan a preset number of groups of first scanning coils to obtain first coordinate data. After obtaining the first coordinate data, the control processing unit 120 is further configured to intermittently control the first antenna and the Nth antenna of N adjacent antennas as the second scanning coils, and sequentially scan a preset number of groups of second scanning coils to obtain second coordinate data, where M and N are positive integers, M > 3, and N > M.

[0110] The control processing unit 120 is further configured to obtain the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data.

[0111] Specifically, the scanning includes: controlling a preset number of groups of first scanning coils as transmitting coils to sequentially transmit electromagnetic waves to the electromagnetic pen, and then controlling the preset number of groups of first scanning coils as receiving coils to sequentially receive the generated resonance signals; controlling a preset number of groups of second scanning coils as transmitting coils to sequentially transmit electromagnetic waves to the electromagnetic pen, and then controlling the preset number of groups of second scanning coils as receiving coils to sequentially receive the generated resonance signals.

[0112] In some examples, M = 4 and N = 7.

[0113] Optionally, the preset number of groups of first scanning coils is seven groups, nine groups, or eleven groups, and the preset number of groups of second scanning coils is at least three groups.

[0114] Optionally, intermittently controlling the first antenna and the Nth antenna of N adjacent antennas as the second scanning coils and sequentially scanning a preset number of groups of second scanning coils includes: sequentially scanning the preset number of groups of first scanning coils at least twice continuously and then performing a sequential scan of the preset number of groups of second scanning coils until the scanning of the first scanning coils and the second scanning coils in the first direction and the second direction is completed.

[0115] Optionally, obtaining the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data includes: calibrating the first coordinate data according to the second coordinate data.

[0116] Specifically, as Figure 7 shown, the control processing unit 120 includes a logic control unit 121, a transmitting unit 122, and a receiving unit 123. Among them, the transmitting unit 122 is configured to cause the first scanning coils or the second scanning coils to emit excitation signals, the receiving unit 123 is configured to receive a plurality of first electromagnetic signals or a plurality of second electromagnetic signals, and the logic control unit 121 is configured to determine the first coordinate data based on the plurality of first electromagnetic signals, determine the second coordinate data based on the plurality of second electromagnetic signals, and determine the trajectory coordinates based on the first coordinate data and the second coordinate data.

[0117] Exemplarily, the control processing unit 120 further includes a microprocessor 124. The microprocessor 124 is configured to output a control signal. The logic control unit 121 is configured to determine a scanning mode based on the control signal. When the scanning mode is the first scanning mode, the logic control unit 121 controls a plurality of first antennas and a plurality of second antennas to form a first scanning coil. When the scanning mode is the second scanning mode, the logic control unit 121 controls a plurality of first antennas and a plurality of second antennas to form a second scanning coil. Wherein, the control signal may be indication information of the scanning mode.

[0118] In one example, N may be 5, 6 or 7. Specifically, when N is 7, the coordinate algorithm for determining the second coordinate data based on the second electromagnetic signal is the same as the coordinate algorithm for determining the first coordinate data based on the first electromagnetic signal, which can reduce the amount of calculation and improve the efficiency of determining the touch coordinates. When N is 5 or 6, the distance between two antennas forming the coil is relatively small, and the change amount of the magnetic field distribution pattern is relatively small, which can avoid the reduction of the accuracy of the touch coordinates.

[0119] In some alternative embodiments, the value range of the distance between two adjacent first antennas is 3 mm to 5 mm, and the value range of the distance between two adjacent second antennas is 3 mm to 5 mm.

[0120] That is to say, the distance between two adjacent first antennas can be any value between 3 mm and 5 mm. For example, the distance between two adjacent first antennas can be 3 mm, 3.2 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc. The distance between two adjacent second antennas can be any value between 3 mm and 5 mm. For example, the distance between two adjacent second antennas can be 3 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.5 mm or 5 mm, etc.

[0121] Compared with the conventional antenna spacing, in this embodiment, the distance between two adjacent first antennas is limited to 3 mm to 5 mm, and the distance between two adjacent second antennas is limited to 3 mm to 5 mm, which reduces the spacing between the antennas and can avoid the reduction of the detected magnetic field energy when the distance between two antennas forming the receiving coil increases.

[0122] Furthermore, as Figure 1 shown, the electromagnetic touch device further includes a first selector 130 and a second selector 140.

[0123] Among them, a plurality of first antennas 111 are electrically connected at one end in the first direction, and the other end of the plurality of first antennas 111 in the first direction is connected to the control processing unit 120 through a first selector 130. The plurality of first antennas 111 are gated by the first selector 130 to form a coil. A plurality of second antennas 112 are electrically connected at one end in the second direction, and the other end of the plurality of second antennas 112 in the second direction is connected to the control processing unit 120 through a second selector 140. The plurality of second antennas 112 are gated by the second selector 140 to form a coil.

[0124] In some embodiments, the electromagnetic touch device further includes a display screen, and the antenna board is integrated in the display screen. At this time, the first antenna and the second antenna located in the active area (AA) are both composed of multiple wires connected in parallel.

[0125] In this embodiment, an electronic device is further provided. The electronic device includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the electromagnetic touch method provided in any one of the above embodiments.

[0126] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the present invention.

Claims

1. An electromagnetic touch control device, characterized in that, Comprising: An antenna board, on which antennas in a first direction and antennas in a second direction are provided. The antennas in the first direction and the antennas in the second direction are respectively combined in pairs with a preset number of antennas spaced apart to form a coil in the first direction and a coil in the second direction. The coil in the first direction and the coil in the second direction are multiplexed as a transmitting coil and a receiving coil. The transmitting coil is used to transmit electromagnetic waves to an electromagnetic pen, and at the same time serves as the receiving coil to receive the resonance signal generated after the electromagnetic pen resonates with the electromagnetic waves transmitted by the transmitting coil; A control processing unit, configured to control the first antenna and the Mth antenna among M adjacent antennas in the first direction or the second direction as a first scanning coil and sequentially scan a preset number of groups of first scanning coils to obtain first coordinate data, and is further configured to intermittently control the first antenna and the Nth antenna among N adjacent antennas as a second scanning coil and sequentially scan a preset number of groups of second scanning coils to obtain second coordinate data after obtaining the first coordinate data, where M and N are positive integers, M>3, and N>M; The control processing unit is further configured to obtain the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data.

2. The electromagnetic touch control device according to claim 1, characterized in that M = 4, N = 7.

3. The electromagnetic touch control device according to claim 1, wherein The preset number of groups of first scanning coils is seven groups, nine groups or eleven groups, and the preset number of groups of second scanning coils is at least three groups.

4. The electromagnetic touch control device according to claim 1, wherein The intermittently controlling the first antenna and the Nth antenna among N adjacent antennas as a second scanning coil and sequentially scanning a preset number of groups of second scanning coils includes: Sequentially scanning the preset number of groups of first scanning coils at least continuously twice and then sequentially scanning a preset number of groups of second scanning coils once until the scanning of the first scanning coils and the second scanning coils in the first direction and the second direction is completed.

5. The electromagnetic touch control device according to claim 4, characterized in that, The scanning includes: Controlling the preset number of groups of first scanning coils as the transmitting coil to sequentially transmit electromagnetic waves to the electromagnetic pen and then controlling the preset number of groups of first scanning coils as the receiving coil to sequentially receive the generated resonance signals; Controlling the preset number of groups of second scanning coils as the transmitting coil to sequentially transmit electromagnetic waves to the electromagnetic pen and then controlling the preset number of groups of second scanning coils as the receiving coil to sequentially receive the generated resonance signals.

6. The electromagnetic touch control device according to claim 1, wherein, The obtaining the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data includes: Calibrating the first coordinate data according to the second coordinate data.

7. An electromagnetic touch control method, characterized in that, A control processing unit applied to the electromagnetic touch control device according to any one of claims 1 to 6, and the electromagnetic touch control method includes: Controlling the first antenna and the Mth antenna among M adjacent antennas in the first direction or the second direction as a first scanning coil and sequentially scanning a preset number of groups of first scanning coils to obtain first coordinate data; Intermittently controlling the first antenna and the Nth antenna among N adjacent antennas as a second scanning coil and sequentially scanning a preset number of groups of second scanning coils to obtain second coordinate data; Obtain the trajectory coordinates of the electromagnetic pen on the antenna board according to the first coordinate data and the second coordinate data; Wherein, M and N are positive integers, M > 3, and N > M.

8. The electromagnetic touch control method according to claim 7, wherein The intermittent control scans the first antenna and the Nth antenna of the adjacent N antennas as the second scanning coil in sequence for a preset number of groups of second scanning coils, including: Scanning the preset number of groups of first scanning coils in sequence at least continuously twice and then scanning the preset number of groups of second scanning coils in sequence once until the scanning of the first scanning coils and the second scanning coils in the first direction and the second direction is completed.

9. The electromagnetic touch control method according to claim 7, wherein The preset number of groups of first scanning coils is seven groups, the preset number of groups of second scanning coils is at least three groups, and the distance between the starting antennas in the second scanning coils is one antenna wiring distance more than the distance between the starting antennas in the first scanning coils.

10. An electronic device, characterized in that, Including: A memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the electromagnetic touch method according to any one of claims 7 to 9.

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