CN117129763A - Stylus offset detection method and electronic device - Google Patents

Abstract

This application discloses a stylus offset detection method and electronic equipment, and relates to the field of electronic technology. The stylus offset detection method includes: detecting the quality factor of the transmitting coil in the electronic device, and determining whether the stylus offset occurs according to the quality factor of the transmitting coil. The offset of the stylus refers to the deviation of the adsorption position of the stylus adsorbed on the electronic device relative to the preset adsorption position. In this way, it can be detected whether the adsorption position of the stylus on the electronic device has shifted.

Description

Stylus offset detection method and electronic device

Technical field

The present application relates to the field of electronic technology, and in particular to a stylus offset detection method and electronic equipment.

Background technique

Electronic devices capable of inputting information through touch, such as tablet computers, may be equipped with a stylus. Users can use a stylus to input text, graphics and other information on electronic devices. In related technology, a stylus can be attached to an electronic device through a magnet. After the stylus is adsorbed at the correct position on the electronic device, electric energy can be transmitted between the transmitting coil in the electronic device and the receiving coil in the stylus, thereby allowing the electronic device to charge the stylus. However, since the user cannot know the specific positions of the transmitting coil and the receiving coil, when the user attaches the stylus to the electronic device, the adsorption position of the stylus on the electronic device may shift, which will affect the electronic device. The device charges the stylus. Based on this, there is an urgent need for a stylus offset detection method to detect whether the adsorption position of the stylus on the electronic device is offset.

Contents of the invention

This application provides a stylus offset detection method and an electronic device, which can detect whether the adsorption position of the stylus on the electronic device is offset. The technical solutions are as follows:

In the first aspect, a stylus offset detection method is provided. The stylus offset detection method is applied to electronic devices. The electronic device includes a processor and a transmitting coil, and the processor is connected to the transmitting coil so that the processor can output an electrical signal to the transmitting coil. The stylus offset detection method includes the following steps: the processor detects the quality factor of the transmitting coil in the electronic device, and the processor determines whether the stylus offset occurs based on the quality factor of the transmitting coil. The offset of the stylus refers to the deviation of the adsorption position of the stylus adsorbed on the electronic device relative to the preset adsorption position.

In this application, the processor can detect the quality factor of the transmitting coil. Since the quality factor of the transmitting coil is different when the stylus is deflected and when it is not deflected, the processor can determine whether it is adsorbed on the electronic device based on the quality factor of the transmitting coil after detecting the quality factor of the transmitting coil. Whether the stylus pen is deflected. In this way, it can be detected whether the adsorption position of the stylus on the electronic device has shifted.

The following describes the process of "the processor determines whether the stylus offset occurs based on the quality factor of the transmitting coil" from two possible implementation methods.

In the first possible implementation, when the processor performs the step of "the processor determines whether the stylus offset occurs based on the quality factor of the transmitting coil", specifically: if the quality factor of the transmitting coil is less than or equal to First threshold, the processor sends the communication signal; if the processor receives a feedback signal for the communication signal within a preset time period after sending the communication signal, it is determined that the stylus offset occurs. If the quality factor of the transmitting coil is greater than or equal to the second threshold, the processor sends the communication signal; if the processor receives a feedback signal for the communication signal within a preset time period after sending the communication signal, it is determined that no stylus offset occurs. Condition. In this embodiment of the present application, the second threshold is greater than the first threshold.

In some embodiments, the processor may periodically detect the quality factor of the transmit coil. The period here can be 1 second or 0.5 seconds.

In this embodiment, after the processor performs the step of "the processor determines whether the stylus offset occurs based on the quality factor of the transmitting coil", it can also be used to perform the following steps: If the processor determines that the stylus does not appear If there is an offset, stop detecting the quality factor of the transmitting coil; control the output power of the transmitting coil.

In the second possible implementation, before the processor performs the step of "the processor detects the quality factor of the transmitting coil in the electronic device", it is also used to perform the following steps: the processor sends the communication signal; if the processor is sending When the feedback signal for the communication signal is received within a preset time period after the communication signal, the processor executes the step of "the processor detects the quality factor of the transmitting coil in the electronic device".

In this case, when the processor performs the step of "the processor determines whether the stylus offset occurs based on the quality factor of the transmitting coil", the specific procedure may be: if the quality factor of the transmitting coil is less than or equal to the first threshold, then The processor determines that the stylus offset occurs; if the quality factor of the transmitting coil is greater than or equal to the second threshold, the processor determines that the stylus offset does not occur.

In some embodiments, the processor may send communication signals periodically. The period here can be 1 second or 0.5 seconds.

In this embodiment, after the processor performs "the processor determines whether the stylus offset occurs based on the quality factor of the transmitting coil", it can also be used to perform the following steps: if the processor determines that the stylus offset does not occur , then stop sending communication signals; control the transmitting coil to output electric energy.

In some embodiments, after the processor performs the step of "the processor determines whether a stylus offset occurs based on the quality factor of the transmitting coil", it can also be used to perform the following steps: if the processor determines that a stylus offset occurs If so, a reminder message will be output. The reminder message is used to remind you of the occurrence of stylus offset.

The process of "the processor detects the quality factor of the transmitting coil in the electronic device" is explained below.

In some embodiments, the electronic device further includes a capacitor, the first plate of the capacitor is connected to the first end of the transmitting coil. In this case, when the processor performs the step of "the processor detects the quality factor of the transmitting coil in the electronic device", the specific steps may be: the processor charges the capacitor and the transmitting coil until both the capacitor and the transmitting coil are in a steady state; The processor controls the connection between the second plate of the capacitor and the second end of the transmitting coil so that an oscillating electrical signal is generated between the first plate of the capacitor and the first end of the transmitting coil; the processor controls the connection between the first plate of the capacitor and the first end of the transmitting coil; The n-1th amplitude and the nth amplitude in the value determine the quality factor of the transmitting coil. Among them, n is an integer greater than or equal to 2.

Specifically, the electronic device also includes a first switch, a second switch, and a third switch. The first terminal of the first switch is connected to the positive electrode of the power supply, the second terminal of the first switch is connected to the second plate of the capacitor and the first terminal of the second switch, and the first terminal of the third switch is connected to the third terminal of the transmitting coil. Two-terminal connection, the second terminal of the second switch and the second terminal of the third switch are both used to connect to the negative pole of the power supply. In this case, when the processor performs the step of "the processor charges the capacitor and the transmitting coil", the specific steps may be: the processor controls the second switch to turn off, and controls the first switch and the third switch to turn on, so as to Charge the capacitor and transmitter coil. When the processor performs the step of "the processor controls the connection between the second plate of the capacitor and the second end of the transmitting coil", the specific steps may be: the processor controls the first switch to turn off, and controls the second switch and the third switch. Turn on so that the second plate of the capacitor is connected to the second end of the transmitting coil.

In some embodiments, when the processor performs the step of "the processor determines the quality factor of the transmitting coil based on the n-1th amplitude and the nth amplitude among the multiple amplitudes of the oscillating electrical signal", Specifically, the processor determines the quality factor of the transmitting coil through the following formula based on the n-1th amplitude and the nth amplitude:

Among them, Q is the quality factor of the transmitting coil, F((n-1)T is the n-1th amplitude, F(nT) is the nth amplitude, π is the pi ratio, and ln( ) is the natural constant. The logarithm of the base.

In a second aspect, a stylus offset detection method is provided, including the following steps: a processor detects the quality factor of a transmitting coil in an electronic device; if the processor determines that a stylus offset occurs based on the quality factor of the transmitting coil, output Reminder message. The reminder message is used to remind you of the occurrence of stylus offset. The offset of the stylus is when the adsorption position of the stylus adsorbed on the electronic device deviates from the preset adsorption position.

In a third aspect, an electronic device is provided, including a transmitting coil, a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the method of any one of the first aspect and the second aspect is implemented.

In a fourth aspect, an electronic device is provided, including a transmitting coil, a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the processor detects the quality factor of the transmitting coil.

The technical effects obtained by the above-mentioned second aspect, third aspect, and fourth aspect are similar to the technical effects obtained by the corresponding technical means in the above-mentioned first aspect, and will not be described again here.

Description of the drawings

Figure 1 is a schematic diagram of an application scenario of an electronic device and a stylus provided by an embodiment of the present application;

Figure 2 is a schematic diagram of an adsorption scene of an electronic device and a stylus provided by an embodiment of the present application;

Figure 3 is a schematic diagram of the positional relationship between the first electronic device and the stylus provided by the embodiment of the present application;

Figure 4 is a schematic diagram of the adsorption relationship between the first electronic device and the stylus provided by the embodiment of the present application;

Figure 5 is a schematic diagram of the positional relationship between the second electronic device and the stylus provided by the embodiment of the present application;

Figure 6 is a schematic diagram of the adsorption relationship between the second electronic device and the stylus provided by the embodiment of the present application;

Figure 7 is a schematic diagram of the positional relationship between the third electronic device and the stylus provided by the embodiment of the present application;

Figure 8 is a schematic diagram of the adsorption relationship between the third electronic device and the stylus provided by the embodiment of the present application;

Figure 9 is a schematic diagram of the positional relationship between the fourth electronic device and the stylus provided by the embodiment of the present application;

Figure 10 is a schematic diagram of the adsorption relationship between the fourth electronic device and the stylus provided by the embodiment of the present application;

Figure 11 is a schematic diagram of the positional relationship between the fifth electronic device and the stylus provided by the embodiment of the present application;

Figure 12 is a schematic diagram of the adsorption relationship between the fifth electronic device and the stylus provided by the embodiment of the present application;

Figure 13 is a schematic diagram of the positional relationship between the sixth electronic device and the stylus provided by the embodiment of the present application;

Figure 14 is a schematic diagram of the adsorption relationship between the sixth electronic device and the stylus provided by the embodiment of the present application;

Figure 15 is a schematic diagram of the positional relationship between the seventh electronic device and the stylus provided by the embodiment of the present application;

Figure 16 is a schematic diagram of the adsorption relationship between the seventh electronic device and the stylus provided by the embodiment of the present application;

Figure 17 is a schematic diagram of the positional relationship between the eighth electronic device and the stylus provided by the embodiment of the present application;

Figure 18 is a schematic diagram of the adsorption relationship between the eighth electronic device and the stylus provided by the embodiment of the present application;

Figure 19 is a schematic diagram of the positional relationship between the ninth electronic device and the stylus provided by the embodiment of the present application;

Figure 20 is a schematic diagram of the adsorption relationship between the ninth electronic device and the stylus provided by the embodiment of the present application;

Figure 21 is a schematic diagram of the positional relationship between the tenth electronic device and the stylus provided by the embodiment of the present application;

Figure 22 is a schematic diagram of the adsorption relationship between the tenth electronic device and the stylus provided by the embodiment of the present application;

Figure 23 is a schematic diagram of the positional relationship between the eleventh electronic device and the stylus provided by the embodiment of the present application;

Figure 24 is a schematic diagram of the adsorption relationship between the eleventh electronic device and the stylus provided by the embodiment of the present application;

Figure 25 is a schematic diagram of the positional relationship between the twelfth electronic device and the stylus provided by the embodiment of the present application;

Figure 26 is a schematic diagram of the adsorption relationship between the twelfth electronic device and the stylus provided by the embodiment of the present application;

Figure 27 is a schematic diagram of the positional relationship between the thirteenth electronic device and the stylus provided by the embodiment of the present application;

Figure 28 is a schematic diagram of the adsorption relationship between the thirteenth electronic device and the stylus provided by the embodiment of the present application;

Figure 29 is a schematic diagram of the positional relationship between the fourteenth electronic device and the stylus provided by the embodiment of the present application;

Figure 30 is a schematic diagram of the adsorption relationship between the fourteenth electronic device and the stylus provided by the embodiment of the present application;

Figure 31 is a module structure diagram of the first electronic device provided by the embodiment of the present application;

Figure 32 is a circuit structure diagram of the first electronic device provided by the embodiment of the present application;

Figure 33 is a circuit structure diagram of the second electronic device provided by the embodiment of the present application;

Figure 34 is a waveform diagram of an oscillating electrical signal provided by an embodiment of the present application;

Figure 35 is a schematic structural diagram of a third adsorption magnet provided by an embodiment of the present application;

Figure 36 is a flow chart of the first stylus offset detection method provided by the embodiment of the present application;

Figure 37 is a schematic diagram of the position of a contact surface provided by an embodiment of the present application;

Figure 38 is a schematic diagram of the first reminder information provided by the embodiment of the present application;

Figure 39 is a schematic diagram of the second type of first reminder information provided by the embodiment of the present application;

Figure 40 is a flow chart of the second stylus offset detection method provided by the embodiment of the present application;

Figure 41 is a flow chart of the third stylus offset detection method provided by an embodiment of the present application;

Figure 42 is a flow chart of the fourth stylus offset detection method provided by an embodiment of the present application;

Figure 43 is a flow chart of the fifth stylus offset detection method provided by the embodiment of the present application;

Figure 44 is a module structure diagram of the second electronic device provided by the embodiment of the present application.

Among them, the meanings represented by each drawing symbol are:

10. Electronic equipment;

102. Camera;

104. Contact surface;

110. Transmitting coil;

122. The first Hall sensor;

124. Second Hall sensor;

130. The first adsorption magnet;

132. The first sub-magnet;

134. Second sub-magnet;

140. The second adsorption magnet;

142. The third sub-magnet;

144. The fourth sub-magnet;

150. Processor;

152. First sub-processor;

154. Second sub-processor;

160. Output unit;

170. Memory;

20. Stylus pen;

202. Metal frame;

210. Receiving coil;

220. Detect magnet;

230. The third adsorption magnet;

232. The fifth sub-magnet;

234. The sixth sub-magnet;

240. The fourth adsorption magnet;

242. The seventh sub-magnet;

244. The eighth magnet.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that "plurality" mentioned in this application means two or more. In the description of this application, unless otherwise stated, "/" means or, for example, A/B can mean A or B; "and/or" in this article is just an association relationship describing related objects, It means that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to facilitate a clear description of the technical solution of the present application, words such as “first” and “second” are used to distinguish identical or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the number and execution order, and words such as "first" and "second" do not limit the number and execution order.

Before giving a detailed explanation of the stylus offset detection method provided by the embodiment of the present application, the application scenarios of the stylus offset detection method are first explained.

Figure 1 is a schematic diagram of an application scenario of an electronic device 10 and a stylus 20 provided by an embodiment of the present application. As shown in FIG. 1 , an electronic device 10 capable of inputting information through touch, such as a tablet computer, may be equipped with a stylus 20 . The user can use the stylus 20 to input text, graphics and other information on the electronic device 10 . FIG. 2 is a schematic diagram of an adsorption scene of an electronic device 10 and a stylus 20 provided by an embodiment of the present application. As shown in FIG. 2 , the stylus pen 20 can be adsorbed on the electronic device 10 .

Figure 3 is a schematic diagram of the positional relationship between an electronic device 10 and a stylus 20 provided by an embodiment of the present application. Figure 4 is a schematic diagram of an adsorption relationship between an electronic device 10 and a stylus 20 provided by an embodiment of the present application. What is shown in Figure 4 The devices shown are all devices in area A in Figure 3. As shown in FIGS. 3 and 4 , the electronic device 10 includes a transmitting coil 110 , a first Hall sensor 122 , a second Hall sensor 124 , a first adsorption magnet 130 and a second adsorption magnet 140 . The first adsorption magnet 130 includes a first sub-magnet 132 and a second sub-magnet 134 . The second adsorption magnet 140 includes a third sub-magnet 142 and a fourth sub-magnet 144 . The stylus 20 includes a receiving coil 210, a detection magnet 220, a third adsorption magnet 230 and a fourth adsorption magnet 240. The third adsorption magnet 230 includes a fifth sub-magnet 232 and a sixth sub-magnet 234 . The fourth adsorption magnet 240 includes a seventh sub-magnet 242 and an eighth sub-magnet 244 . The first adsorption magnet 130, the second adsorption magnet 140, the third adsorption magnet 230 and the fourth adsorption magnet 240 all adopt Halbach Array to enhance the adsorption force. A transverse magnet is also provided between the two sub-magnets in each adsorption magnet. The detection magnet 220 in the stylus 20 is a separate magnet. In the following description, the relative position of the first Hall sensor 122 and the transmitting coil 110 is defined as: the first Hall sensor 122 is located on the left side of the transmitting coil 110 . In this case, the second Hall sensor 124 is located on the right side of the transmit coil 110 . At the same time, in the embodiments of the present application, to facilitate understanding, the “left” in the text description is the same direction as the direction left along the paper in the drawings, and the “right” in the text description is the direction along the paper in the drawings. The bearing to the right is the same direction.

After the stylus 20 is adsorbed to the correct position on the electronic device 10 , electric energy can be transmitted between the transmitting coil 110 in the electronic device 10 and the receiving coil 210 in the stylus 20 , thereby allowing the electronic device 10 to charge the stylus 20 . The correct position here refers to the preset adsorption position where the stylus pen 20 is adsorbed on the electronic device 10 . At the preset adsorption position, the adsorption positions of the electronic device 10 and the stylus 20 do not shift. In the embodiment of the present application, the preset adsorption positions include the following two different situations.

(A) In the first case, as shown in Figures 3 and 4, when the tip of the stylus pen 20 faces left, the first sub-magnet 132 and the fifth sub-magnet 232 are attracted to each other, and the second sub-magnet 134 and the fifth sub-magnet 232 are attracted to each other. The sixth sub-magnet 234 is attracted to each other, the third sub-magnet 142 and the seventh sub-magnet 242 are attracted to each other, and the fourth sub-magnet 144 and the eighth sub-magnet 244 are attracted to each other. When the adsorption relationship between the electronic device 10 and the stylus 20 is as shown in FIG. 4 , the transmitting coil 110 and the receiving coil 210 are located at corresponding positions, and the first Hall sensor 122 and the detection magnet 220 are located at corresponding positions. In this case, the detection magnet 220 triggers the first Hall sensor 122. At this time, the transmitting coil 110 in the electronic device 10 outputs electric energy, and the receiving coil 210 in the stylus 20 can receive the electric energy, so that the electronic device 10 can respond to the stylus 20. for wireless charging.

(B) In the second case, Figure 5 is a schematic diagram of the positional relationship between another electronic device 10 and the stylus 20 provided by the embodiment of the present application. The adsorption relationship between the electronic device 10 and the stylus 20 is as shown in Figure 6 . As shown in FIGS. 5 and 6 , when the tip of the stylus pen 20 faces right, the first sub-magnet 132 and the eighth sub-magnet 244 are attracted to each other, the second sub-magnet 134 and the seventh sub-magnet 242 are attracted to each other, and the third sub-magnet 132 is attracted to the seventh sub-magnet 242 . The magnet 142 and the sixth sub-magnet 234 are attracted to each other, and the fourth sub-magnet 144 and the fifth sub-magnet 232 are attracted to each other. When the adsorption relationship between the electronic device 10 and the stylus 20 is as shown in FIG. 6 , the transmitting coil 110 and the receiving coil 210 are located at corresponding positions, and the second Hall sensor 124 and the detection magnet 220 are located at corresponding positions. In this case, the detection magnet 220 triggers the second Hall sensor 124. At this time, the transmitting coil 110 in the electronic device 10 outputs electric energy, and the receiving coil 210 in the stylus 20 can receive electric energy, so that the electronic device 10 can respond to the stylus 20. for wireless charging.

Since the user cannot know the specific positions of the transmitting coil 110 and the receiving coil 210 , when the user attaches the stylus 20 to the electronic device 10 , based on general usage habits, the user will subconsciously place the stylus 20 in the middle of the electronic device 10 . However, as shown in FIGS. 3 and 5 , since the camera 102 is disposed in the middle of the electronic device 10 , the transmitting coil 110 , the first adsorption magnet 130 and the second adsorption magnet 140 are usually disposed on the left ( (not shown) or to the right. In this case, the adsorption position of the stylus pen 20 on the electronic device 10 may shift. In addition, even if the user knows that the stylus pen 20 should be adsorbed to the left or right position of the electronic device 10, since there is no clear position prompt, the user cannot accurately determine the adsorption position of the stylus pen 20, which may easily cause the stylus pen 20 to be placed on the left or right side of the electronic device 10. Emission of the adsorption position deviation on the electronic device 10 .

Twelve adsorption position deviations that may occur when the stylus 20 is adsorbed on the electronic device 10 will be described below.

(1) In the first case, as shown in FIGS. 7 and 8 , the tip of the stylus pen 20 faces left, and the adsorption force mainly comes from the third sub-magnet 142 and the sixth sub-magnet 234 that attract each other.

(2) In the second case, as shown in FIGS. 9 and 10 , the tip of the stylus pen 20 faces left, and the adsorption force mainly comes from the second sub-magnet 134 and the seventh sub-magnet 242 that attract each other.

(3) In the third case, as shown in FIGS. 11 and 12 , the tip of the stylus pen 20 faces left, and the adsorption force mainly comes from the fourth sub-magnet 144 and the fifth sub-magnet 232 that attract each other.

(4) In the fourth situation, as shown in Figures 13 and 14, the tip of the stylus pen 20 faces left, and the adsorption force mainly comes from the first sub-magnet 132 and the eighth sub-magnet 244 that attract each other.

(5) In the fifth case, as shown in Figures 15 and 16, the tip of the stylus pen 20 faces left, and the adsorption force mainly comes from the mutual attraction of the third adsorption magnet 230 and the transmitting coil 110, as well as the mutual attraction of the third adsorption magnet 230 and the transmitting coil 110. Two adsorption magnets 140 and receiving coils 210.

(6) In the sixth case, as shown in Figures 17 and 18, the tip of the stylus pen 20 faces left, and the adsorption force mainly comes from the mutual attraction of the first attraction magnet 130 and the receiving coil 210, and the mutual attraction of the third Four adsorption magnets 240 and transmitting coils 110.

(7) In the seventh case, as shown in FIGS. 19 and 20 , the tip of the stylus pen 20 faces right, and the adsorption force mainly comes from the second sub-magnet 134 and the sixth sub-magnet 234 that attract each other.

(8) In the eighth case, as shown in Figures 21 and 22, the tip of the stylus pen 20 faces right, and the adsorption force mainly comes from the third sub-magnet 142 and the seventh sub-magnet 242 that attract each other.

(9) In the ninth case, as shown in Figures 23 and 24, the tip of the stylus pen 20 faces right, and the adsorption force mainly comes from the first sub-magnet 132 and the fifth sub-magnet 232 that attract each other.

(10) In the tenth case, as shown in Figures 25 and 26, the tip of the stylus pen 20 faces right, and the adsorption force mainly comes from the fourth sub-magnet 144 and the eighth sub-magnet 244 that attract each other.

(11) In the eleventh case, as shown in Figures 27 and 28, the tip of the stylus pen 20 is facing right, and the adsorption force mainly comes from the mutual attraction of the first adsorption magnet 130 and the receiving coil 210, and the mutual attraction of the first adsorption magnet 130 and the receiving coil 210. The third adsorption magnet 230 and the transmitting coil 110.

(12) In the twelfth case, as shown in Figures 29 and 30, the tip of the stylus pen 20 is facing to the right, and the adsorption force mainly comes from the attracting fourth adsorbing magnet 240 and the transmitting coil 110, as well as the attracting The second adsorption magnet 140 and the receiving coil 210.

Referring to FIGS. 7 to 30 , it can be seen that when the adsorption position of the stylus 20 on the electronic device 10 is shifted, the transmitting coil 110 and the receiving coil 210 are not in corresponding positions, which will affect the electronic device 10's operation of the stylus 20 . Charge. Based on this, the present application provides a method for detecting the offset of the stylus 20 and the electronic device 10 , which can detect whether the adsorption position of the stylus 20 on the electronic device 10 is offset.

It can be understood that in the above embodiments, only the case where the adsorption magnet has a three-section structure (for example, the first adsorption magnet 130 includes the first sub-magnet 132 and the second sub-magnet 134 and a transverse magnet) is shown. In some other embodiments, the adsorption magnet may also adopt a five-segment structure, that is, each adsorption magnet includes three sub-magnets and two transverse magnets interspersed between the three sub-magnets. In addition, the south (S) pole and the north (north, N) pole of the adsorption magnet can also be arranged upside down without affecting the function of the adsorption magnet.

In the embodiment of the present application, a simulation analysis is performed on the adsorption force between the electronic device 10 and the stylus 20 in two cases of the preset adsorption positions and twelve cases of the above-mentioned adsorption position deviations. The simulation results As shown in Table 1 below. The unit of adsorption force in Table 1 is Newton (N).

Table 1

According to Table 1, it can be seen that when the adsorption positions of the electronic device 10 and the stylus pen 20 do not shift, the adsorption force between the electronic device 10 and the stylus pen 20 is the largest, and is much greater than the twelve cases where the adsorption positions shift, as 1.9178N. For two cases with different pen tip orientations but the same substantial adsorption relationship, such as cases (1) and (7), cases (2) and (8)... cases (6) and (12), the electronic device 10 and the stylus 20 The adsorption force between them is also the same. The difference in adsorption force between different situations is also affected by the detection magnet 220.

According to Table 1, it can be seen that when the adsorption positions of the electronic device 10 and the stylus pen 20 are offset, there is also an adsorption force between the electronic device 10 and the stylus pen 20. Among them, in the four cases (3), (4), (9), and (10), since the adsorption position deviation of the electronic device 10 and the stylus 20 is the most serious, the gap between the electronic device 10 and the stylus 20 The adsorption force is also small, so the user can clearly feel that the adsorption position of the stylus 20 on the electronic device 10 has shifted. Based on this, the stylus 20 offset detection method provided by the embodiment of the present application is mainly aimed at situations (1), (2), (5), (6), (7), (8), (11), (12) These eight situations carry out adsorption position shift detection.

First, the electrical structure of the electronic device 10 to which the stylus 20 offset detection method provided by the embodiment of the present application is applied will be described. In the embodiment of the present application, the connection between the two electronic devices is an electrical connection. The electrical connection here refers to the connection between the two electronic devices for the transmission of electrical signals. The electrical connection between two electronic devices may be directly connected through wires or indirectly connected through other electronic devices.

Figure 31 is a module structure diagram of an electronic device 10 provided by an embodiment of the present application. As shown in FIG. 31 , the electronic device in the electronic device 10 may include a transmitting coil 110 and a processor 150 .

The transmitting coil 110 may include a ferrite and a metal wire wound around the ferrite. The electronic device 10 may output electrical signals through the transmitting coil 110 to charge the stylus 20 and/or communicate with the stylus 20 . The processor 150 is connected to the transmitting coil 110 so that the processor 150 can output an electrical signal to the transmitting coil 110 and can detect the electrical signal in the transmitting coil 110 .

It can be understood that in the embodiment of the present application, the processor 150 refers to an integrated circuit with a processing function, and it is not limited to the fact that the processor 150 must be a packaged chip. For example, FIG. 32 is a circuit structure diagram of an electronic device 10 provided by an embodiment of the present application. As shown in Figure 32, in some embodiments, the processor 150 may include a first sub-processor 152 and a second sub-processor 154 that are connected. The first sub-processor 152 may be packaged together with the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 to form a transmit (transport, TX) chip in the electronic device 10. The second sub-processor 154 may be a system on chip (SOC) within the electronic device 10 . The SOC includes a central processing unit (CPU), a graphics processing unit (GPU), a baseband, and the like. The embodiment shown in FIG. 32 is not used to limit the position of each electronic device.

In some embodiments, as shown in FIG. 32 , the electronic device 10 further includes a capacitor C. The first plate of the capacitor C is connected to the first end of the transmitting coil 110 , and the first end of the transmitting coil 110 is connected to the first sub-processor 152 . The first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 are all three-terminal switching devices, that is, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 all have a first end, second end and control end. The first terminal of the first switch Q1 and the first terminal of the fourth switch Q4 are both used to connect to the positive electrode of the power supply. The second terminal of the first switch Q1 is connected to the second plate of the capacitor C and the first terminal of the second switch Q2. connect. The second end of the fourth switch Q4 and the first end of the third switch Q3 are both connected to the second end of the transmitting coil 110. The second end of the second switch Q2 and the second end of the third switch Q3 are both used to connect to the power supply. Negative connection. In the embodiment shown in Figure 32, the positive pole of the power supply is represented by the symbol "+", and the negative pole of the power supply is represented by the symbol "-". The first sub-processor 152 may also be connected to the control terminals of the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 (the connection relationship is not shown in the figure) to control the first switch Q1, the third switch Q1, the third switch Q3 and the fourth switch Q4. The second switch Q2, the third switch Q3, and the fourth switch Q4 are turned on and off.

In some embodiments, as shown in FIG. 33 , the electronic device 10 further includes an output unit 160 . The output unit 160 is a device in the electronic device 10 that can output information to the user. For example, the output unit 160 may be a display screen or a speaker in the electronic device 10 . The output unit 160 can be connected with the second sub-processor 154 in the processor 150, so that the second sub-processor 154 can control the operation of the output unit 160. That is to say, when the output unit 160 is a display screen, the second sub-processor 154 can control the display screen to display text information or image information. When the output unit 160 is a speaker, the second sub-processor 154 can control the speaker to emit sound.

The principle of the stylus pen 20 offset detection method provided by the embodiment of the present application will be described below. In the embodiment of the present application, the principle of the stylus pen 20 offset detection method is to determine whether the adsorption position of the stylus pen 20 on the electronic device 10 is offset based on the quality factor of the transmitting coil 110 . This principle may specifically include two parts: "the process of determining the quality factor of the transmitting coil 110" and "the relationship between the quality factor of the transmitting coil 110 and the adsorption position of the stylus 20 on the electronic device 10".

(1) The process of determining the quality factor of the transmitting coil 110.

The processor 150 is connected to the transmitting coil 110 so that the processor 150 can detect the electrical signal in the transmitting coil 110 . In this embodiment of the present application, the processor 150 can detect the quality factor of the transmitting coil 110 by detecting the electrical signal in the transmitting coil 110 . Taking the circuit structure of the electronic device 10 shown in FIG. 32 as an example, the first sub-processor 152 can detect the quality factor of the transmitting coil 110 by detecting the electrical signal in the transmitting coil 110 .

Specifically, when the first sub-processor 152 is working, it can control the second switch Q2 and the fourth switch Q4 to be turned off, and the first switch Q1 and the third switch Q3 to be turned on. At this time, a path can be formed starting from the positive electrode of the power supply and returning to the negative electrode of the power supply through the first switch Q1, capacitor C, transmitting coil 110 and third switch Q3, thereby charging the capacitor C and the transmitting coil 110.

When the capacitor C and the transmitting coil 110 are fully charged, a steady state is reached. At this time, the capacitor C and the transmitting coil 110 cannot continue to charge. In this case, the first sub-processor 152 can control the first switch Q1 and the fourth switch Q4 to turn off, and the second switch Q2 and the third switch Q3 to turn on, so that the second plate of the capacitor C passes through the second switch. Q2 and the third switch Q3 are connected to the second end of the transmitting coil 110 . At this time, an oscillating electrical signal will be generated in the loop formed by the capacitor C, the transmitting coil 110, the second switch Q2 and the third switch Q3. Since the capacitor C has an equivalent series resistance, the wire also has resistance, and the metal in the electronic device 10 and the stylus 20 close to the transmitting coil 110 will also produce eddy current losses, therefore, between the capacitor C, the transmitting coil 110, the second switch Q2 and the third There is also impedance in the loop formed by the three switches Q3. That is to say, the loop formed by the capacitor C, the transmitting coil 110, the second switch Q2 and the third switch Q3 is an inductor capacitor impedance (LCR) oscillation circuit. Based on this, the oscillating electrical signal will show a gradually attenuating waveform, as shown in Figure 34. In Figure 34, the unit of the abscissa is "×10 ^-4 seconds" and the unit of the ordinate is volt (V).

According to Figure 34, it can be seen that the gradually attenuated oscillating electrical signal has multiple amplitudes. The first sub-processor 152 may detect the oscillating electrical signal and determine the quality factor of the transmitting coil 110 according to the n-1th amplitude and the nth amplitude among the plurality of amplitudes of the oscillating electrical signal. n here is an integer greater than or equal to 2.

Specifically, after obtaining the n-1th amplitude and the n-th amplitude among the multiple amplitudes of the oscillating electrical signal, the first sub-processor 152 can obtain the n-1th amplitude and the n-th amplitude through the following formula: The ratio of the nth amplitude, that is:

Among them, F((n-1)T) is the n-1th amplitude, F(nT) is the nth amplitude, S is the ratio of the n-1th amplitude to the nth amplitude, e is the natural constant, ξ is the conductivity, ω ₀ is the oscillation angular frequency, and T is the oscillation period.

In the LCR oscillation circuit, there is the following formula:

Among them, R is the impedance value of the LCR oscillation circuit, C is the capacitance C value of the LCR oscillation circuit, L is the inductance value of the LCR oscillation circuit, π is the pi ratio, and ω is the oscillation frequency.

Combining formula ① and formula ② can be obtained:

Among them, ln( ) is the logarithm with the natural constant as the base.

In the LCR oscillation circuit, the quality factor Q of the transmitting coil 110 (ie, the inductor) is:

Combining formula ③ and formula ④ can be obtained:

By deforming formula ⑤, you can get:

In this way, after obtaining the n-1th amplitude and the nth amplitude among the multiple amplitudes of the oscillating electrical signal, the first sub-processor 152 can determine the quality factor of the transmitting coil 110 through formula ① and formula ⑥.

(2) The relationship between the quality factor of the transmitting coil 110 and the adsorption position of the stylus 20 on the electronic device 10 .

According to the above formula ④, it can be seen that in the electronic device 10, the quality factor of the transmitting coil 110 is only related to the inductance value and impedance value of the LCR oscillation circuit where the transmitting coil 110 is located. When the stylus pen 20 is adsorbed to the electronic device 10, if the stylus pen 20 is adsorbed at the preset adsorption position on the electronic device 10, that is, when situations (A) and (B) occur, the inductance value of the LCR oscillation circuit will increase. , thereby increasing the quality factor of the transmitting coil 110. On the contrary, when the stylus pen 20 is adsorbed to the electronic device 10, if the adsorption position of the stylus pen 20 is offset, that is, situations (1), (2), (5), (6), (7), (8), ( When 11) and (12) occur, the impedance value of the LCR oscillation circuit will increase, thereby reducing the quality factor of the transmitting coil 110.

Specifically, when the stylus 20 is adsorbed at the preset adsorption position on the electronic device 10, that is, when situations (A) and (B) occur, as shown in Figures 4 and 6, at this time the receiving coil 210 and the transmitting The coil 110 is in a corresponding position. Since the receiving coil 210 and the transmitting coil 110 are both metal wires wound around ferrite, when the transmitting coil 110 and the receiving coil 210 are in corresponding positions, the inductance value of the transmitting coil 110 will increase, that is, LCR oscillation The inductance value of the circuit will increase, thereby increasing the quality factor of the transmitting coil 110.

When the adsorption position of the stylus 20 on the electronic device 10 is shifted, situations (1), (2), (5), (6), (7), (8), (11), and (12) occur. , as can be seen from the drawings, the receiving coil 210 and the transmitting coil 110 are far away from each other at this time, and the adsorption magnet in the stylus 20 is close to the transmitting coil 110 . FIG. 35 is a schematic structural diagram of a third adsorption magnet 230 provided by an embodiment of the present application. The structures of the first adsorption magnet 130 , the second adsorption magnet 140 , and the fourth adsorption magnet 240 are the same as the structure of the third adsorption magnet 230 . As shown in Figure 35, the adsorption magnet using the Halbach array requires a metal frame 202 as a supporting structure for containing the magnet. In addition, the adsorption magnet itself also contains metal. Therefore, when the adsorption magnet in the stylus 20 is close to the transmitting coil 110, an eddy current effect will occur. At this time, the metal frame 202 close to the transmitting coil 110 and the metal in the adsorption magnet will absorb Energy, which is manifested as an increase in the impedance value of the LCR oscillation circuit, thereby reducing the quality factor of the transmitting coil 110.

Based on this, it can be determined according to the quality factor of the transmitting coil 110 whether the stylus 20 is deflected. Specifically, the first threshold and the second threshold may be preset in the first sub-processor 152 . The first threshold is less than the second threshold. In addition, the settings of the first threshold and the second threshold also need to meet the following conditions: when the stylus 20 is adsorbed at the preset adsorption position on the electronic device 10 , that is, when situations (A) and (B) occur, the second threshold Less than or equal to the quality factor of the transmitting coil 110; when the adsorption position of the stylus 20 on the electronic device 10 is offset, that is, situations (1), (2), (5), (6), (7), (8) ), (11), and (12) occur, the first threshold is greater than or equal to the quality factor of the transmitting coil 110; when the electronic device 10 is not attracted to the stylus 20, and the electronic device 10 is not attracted to other metal debris, iron When oxygen impurities are adsorbed, the quality factor of the transmitting coil 110 is greater than the first threshold and less than the second threshold.

In this case, if the stylus 20 is adsorbed on the electronic device 10 and the first sub-processor 152 detects that the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, it can be determined that the stylus 20 is adsorbed on the electronic device 10 The preset adsorption position, that is, there is no offset of the stylus 20. On the contrary, if the stylus 20 is adsorbed on the electronic device 10 and the first sub-processor 152 detects that the quality factor of the transmitting coil 110 is less than or equal to the first threshold, it can be determined that the adsorption position of the stylus 20 has shifted.

Based on the above principles, embodiments of the present application provide a stylus 20 offset detection method, which is applied to the electronic device 10 shown in Figure 31, Figure 32 or Figure 33. Figure 36 is a flow chart of a method for detecting the offset of the stylus 20 provided by an embodiment of the present application. As shown in Figure 36, the stylus 20 offset detection method includes the following steps S100 and S200.

S100, the processor 150 detects the quality factor of the transmitting coil 110 in the electronic device 10.

When step S100 is specifically implemented, it can be applied to the electronic device 10 as shown in Figure 32 or Figure 33. In this case, step S100 may specifically include the following steps S110 to S130.

S110, the processor 150 charges the capacitor C and the transmitting coil 110 until both the capacitor C and the transmitting coil 110 are in a steady state.

Specifically, the processor 150 can control the second switch Q2 and the fourth switch Q4 to turn off, and control the first switch Q1 and the third switch Q3 to turn on, thereby charging the capacitor C and the transmitting coil 110 . In this embodiment of the present application, a first preset duration may be set in the processor 150 . The first preset time period should be greater than or equal to the time required for the capacitor C and the transmitting coil 110 to be fully charged. In this way, when the processor 150 performs step S110, specifically, the processor 150 controls the second switch Q2 and the fourth switch Q4 to turn off, and controls the first switch Q1 and the third switch Q3 to turn off within the first preset time period. pass, thereby charging the capacitor C and the transmitting coil 110, so that both the capacitor C and the transmitting coil 110 are in a steady state.

S120 , the processor 150 controls the second plate of the capacitor C to be connected to the second end of the transmitting coil 110 , so that an oscillating electrical signal is generated between the first plate of the capacitor C and the first end of the transmitting coil 110 .

Specifically, the processor 150 can control the first switch Q1 and the fourth switch Q4 to turn off, and the second switch Q2 and the third switch Q3 to turn on, so that the second plate of the capacitor C is connected to the second end of the transmitting coil 110 connect. At this time, an oscillating electrical signal will be generated in the loop formed by the capacitor C, the transmitting coil 110, the second switch Q2 and the third switch Q3, that is, between the first plate of the capacitor C and the first end of the transmitting coil 110 Produce oscillating electrical signals.

S130, the processor 150 determines the quality factor of the transmitting coil 110 based on the n-1th amplitude and the nth amplitude among the multiple amplitudes of the oscillating electrical signal.

When an oscillating electrical signal is generated between the first plate of the capacitor C and the first end of the transmitting coil 110, the processor 150 connected to the first end of the transmitting coil 110 can detect the oscillating electrical signal, and detect the oscillating electrical signal according to the The n-1th amplitude and the n-th amplitude among the plurality of amplitudes are used to determine the quality factor of the transmitting coil 110 through formula ① and formula ⑥.

S200, the processor 150 determines whether the stylus 20 is deflected according to the quality factor of the transmitting coil 110.

The processor 150 can obtain the quality factor of the transmitting coil 110 after executing step S100. In this case, if the device adsorbed on the electronic device 10 is the stylus 20 , the processor 150 can determine whether the stylus 20 is deflected based on the quality factor of the transmitting coil 110 . Specifically: if the quality factor of the transmitting coil 110 is less than or equal to the first threshold, it indicates that the stylus 20 has drifted; if the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, it indicates that the stylus 20 has not drifted. Condition. In this way, it can be detected whether the adsorption position of the stylus 20 on the electronic device 10 is shifted.

In some embodiments, since other metal conductors or ferrites other than the stylus 20 are close to the transmitting coil 110 of the electronic device 10, it will also cause the quality factor of the transmitting coil 110 to change. Therefore, the processor 150 also needs to It is determined whether the device adsorbed on the electronic device 10 is the stylus 20 . In a first possible implementation, the processor 150 may determine whether the device adsorbed on the electronic device 10 is the stylus 20 during step S200 . In a second possible implementation, the processor 150 may determine whether the device adsorbed on the electronic device 10 is the stylus 20 before performing step S200.

In these two possible implementations, the specific implementation ways in which the processor 150 performs step S200 are different. The process of step S200 "the processor 150 determines whether the stylus 20 is offset according to the quality factor of the transmitting coil 110" is explained in detail below based on these two possible implementations.

(1) In a first possible implementation, the processor 150 may determine whether the device adsorbed on the electronic device 10 is the stylus 20 during step S200. In this case, step S200 may specifically include the following steps S210 to S240.

S210, if the quality factor of the transmitting coil 110 is less than or equal to the first threshold, the processor 150 sends a communication signal.

S220, if the processor 150 receives a feedback signal for the communication signal within the second preset time period after sending the communication signal, it is determined that the stylus 20 is deflected.

S230, if the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, the processor 150 sends a communication signal.

S240, if the processor 150 receives the feedback signal for the communication signal within the second preset time period after sending the communication signal, it is determined that the stylus pen 20 does not shift.

Among them, step S220 is located after step S210, step S240 is located after step S230, and step S230 and step S210 are two steps executed in parallel.

The processor 150 may send the communication signal by broadcasting the communication signal. In other words, when the processor 150 sends a communication signal, there is no specific target to receive the communication signal. The processor 150 may send communication signals in specified directions. The communication signal is used to identify the stylus 20. Generally, as shown in FIG. 37 , the electronic device 10 also has a contact surface 104 . The contact surface 104 may be a frame of the electronic device 10 . When the stylus pen 20 is adsorbed on the electronic device 10, it contacts the contact surface 104. The propagation distance of the communication signal can meet the following conditions: when the stylus 20 is in contact with the contact surface 104 of the electronic device 10, the stylus 20 can receive the communication signal; when the stylus 20 is not in contact with the contact surface 104 of the electronic device 10, The stylus 20 cannot receive the communication signal.

After receiving the communication signal, the stylus pen 20 can send a feedback signal in response to the communication signal. The feedback signal sent by the stylus 20 may carry information about the stylus 20 , such as the identity number (ID) of the stylus 20 . In this way, the processor 150 of the electronic device 10 can recognize the stylus 20 after receiving the feedback signal.

In this possible implementation, the processor 150 first determines whether an offset occurs based on the quality factor of the transmitting coil 110 , and then determines whether the device adsorbed on the electronic device 10 is the stylus 20 by sending communication signals and receiving feedback signals. . Wherein, when the quality factor of the transmitting coil 110 is less than or equal to the first threshold, the processor determines that an offset condition occurs. When the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, the processor determines that no offset condition occurs. When the processor 150 receives the feedback signal for the communication signal within the second preset time period after sending the communication signal, the processor 150 determines that the device adsorbed on the electronic device 10 is the stylus 20 . When the processor 150 does not receive a feedback signal for the communication signal within the second preset time period after sending the communication signal, the processor 150 determines that the device adsorbed on the electronic device 10 is not the stylus 20 . In this way, the processor 150 can determine whether the stylus 20 is deflected.

It can be understood that the second preset duration should be longer than the duration required for the stylus 20 to send a feedback signal in response to the communication signal after receiving the communication signal. For example, the second preset time period may be 0.2 seconds, 0.5 seconds or 1 second. In some specific embodiments, when the stylus 20 offset detection method is applied to the electronic device 10 shown in FIG. 32 or FIG. 33 , steps S210 to S240 may be executed by the first sub-processor 152 in the processor 150 . When the first sub-processor 152 is working, the communication signal can be sent by modulating the waveform of the electrical signal on the transmitting coil 110 .

In this possible implementation, when the processor performs step S100 , the processor 150 may periodically detect the quality factor of the transmitting coil 110 in the electronic device 10 .

That is to say, the processor 150 may detect the quality factor of the transmitting coil 110 every third preset time interval. Here, the third preset time period is greater than or equal to the time period required by the processor 150 to perform steps S110 to S130. The third preset time period may be, for example, 0.5 seconds, 1 second or 2 seconds. In this case, the processor 150 detects the quality factor of the transmitting coil 110 every third preset time interval. If it is detected that the quality factor of the transmitting coil 110 is greater than the first threshold and less than the second threshold, the quality factor of the transmitting coil 110 is detected again at the third preset time period after the quality factor of the transmitting coil 110 is detected. If it is detected that the quality factor of the transmitting coil 110 is less than or equal to the first threshold or it is detected that the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, a communication signal is sent. At this time, if the second preset value is reached after sending the communication signal. When the feedback signal for the communication signal is received within the time period, it is determined according to the quality factor of the transmitting coil 110 whether the stylus 20 is deflected.

Based on this, after step S200, the processor 150 is also configured to perform the following steps S310 to S320.

S310, if it is determined that the stylus pen 20 does not shift, the processor 150 stops detecting the quality factor of the transmitting coil 110.

S320, the processor 150 controls the transmitting coil 110 to output electric energy.

When the processor 150 determines that the stylus pen 20 is not deflected, that is, when the processor 150 determines that the stylus pen 20 is adsorbed at the preset adsorption position on the electronic device 10, the processor 150 can stop detecting the quality factor of the transmitting coil 110, And control the transmitting coil 110 to output electric energy. When steps S310 and S320 are implemented in detail, they may be applied to the electronic device 10 shown in FIG. 32 or FIG. 33 . In this case, step S320 may specifically include the following steps S321 and S322.

S321, in the first stage, the processor 150 controls the first switch Q1 and the third switch Q3 to turn on, and controls the second switch Q2 and the fourth switch Q4 to turn off.

S322, in the second stage after the first stage, the processor 150 controls the second switch Q2 and the fourth switch Q4 to turn on, and controls the first switch Q1 and the third switch Q3 to turn off.

In this embodiment, the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 form an inverter bridge, which can convert the DC power output by the positive pole and the negative pole of the power supply into two-phase alternating current. Steps S321 and S322 are repeatedly executed to output alternating current to the capacitor C and the transmitting coil 110, thereby causing the transmitting coil 110 to output electric energy.

It can be understood that in steps S310 and S320, the reason why the processor 150 needs to first stop detecting the quality factor of the transmitting coil 110 and then control the output of electric energy of the transmitting coil 110 is: before detecting the quality factor of the transmitting coil 110 and controlling the output of the transmitting coil 110 In the two different processes of electric energy, the processor 150 has different control logic for the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4. Therefore, the processor 150 cannot detect the quality of the transmitting coil 110 at the same time. factors and controls the transmitting coil 110 to output electrical energy. When the processor 150 determines that the stylus 20 is deflected, it may continue to periodically detect the quality factor of the transmitting coil 110 in the electronic device 10 .

(2) In the second possible implementation manner, the processor 150 may determine whether the device adsorbed on the electronic device 10 is the stylus 20 before performing step S200. In this case, the processor 150 may perform the following step S001 before step S100.

S001, the processor 150 sends a communication signal.

If the processor 150 receives the feedback signal for the communication signal within the second preset time period after sending the communication signal, step S100 is executed.

Based on this, when the processor 150 executes step S200, step S200 may specifically include the following steps S250 and S260.

S250, if the quality factor of the transmitting coil 110 is less than or equal to the first threshold, the processor 150 determines that the stylus 20 is deflected.

S260, if the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, the processor 150 determines that the stylus pen 20 does not shift.

Specifically, in this possible implementation, the processor 150 first determines whether the device adsorbed on the electronic device 10 is the stylus 20 by sending a communication signal and receiving a feedback signal (or in other words, by sending a communication signal and receiving a feedback signal). Determine whether the stylus 20 is adsorbed to the electronic device 10), if so, the processor 150 then detects the quality factor of the transmitting coil 110, and determines whether an offset occurs according to the quality factor of the transmitting coil 110. The basis for the processor to determine whether the device adsorbed on the electronic device 10 is the stylus 20 is that the processor 150 receives a feedback signal for the communication signal within the second preset time period after sending the communication signal. In this way, when the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, the processor 150 can determine that the device adsorbed on the electronic device 10 is the stylus 20 and no deviation of the stylus 20 occurs. When the quality factor of the transmitting coil 110 is less than or equal to the first threshold, the processor 150 may determine that the device adsorbed on the electronic device 10 is the stylus 20 and the stylus 20 is deflected.

In this possible implementation, when the processor executes step S001, specifically: the processor 150 periodically sends a communication signal.

That is to say, the processor 150 may send a communication signal every fourth preset time interval to determine whether the stylus 20 is adsorbed to the electronic device 10 . Here, the fourth preset time period is longer than the second preset time period. For example, the fourth preset time period may be 1 second or 2 seconds. In this case, the processor 150 sends a communication signal every fourth preset time interval. If no feedback signal is received within the second preset time period after sending the communication signal once, then the communication signal is sent again during the fourth preset time period after the communication signal is sent. If a feedback signal is received within a second preset time period after sending a communication signal, the quality factor of the transmitting coil 110 is detected, and then whether the stylus 20 is deflected is determined based on the quality factor of the transmitting coil 110 .

Based on this, after step S200, the processor 150 is also configured to perform the following steps S410 to S420.

S410, if it is determined that the stylus pen 20 does not shift, the processor 150 stops sending communication signals.

S420, the processor 150 controls the transmitting coil 110 to output electric energy.

When the processor 150 determines that the stylus 20 is not deflected, that is, when the processor 150 determines that the stylus 20 is adsorbed at the preset adsorption position on the electronic device 10 , the processor 150 can stop sending communication signals and control the transmitting coil. 110 outputs electrical energy. When steps S410 and S420 are implemented in detail, they may be applied to the electronic device 10 shown in FIG. 32 or FIG. 33 . In this case, step S420 may specifically include the following steps S421 and S422.

S421, in the first stage, the processor 150 controls the first switch Q1 and the third switch Q3 to turn on, and controls the second switch Q2 and the fourth switch Q4 to turn off.

S422, in the second stage after the first stage, the processor 150 controls the second switch Q2 and the fourth switch Q4 to turn on, and controls the first switch Q1 and the third switch Q3 to turn off.

In this embodiment, the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 form an inverter bridge, which can convert the DC power output by the positive pole and the negative pole of the power supply into two-phase alternating current. Steps S421 and S422 are repeatedly executed in a loop to output alternating current to the capacitor C and the transmitting coil 110, so that the transmitting coil 110 outputs electric energy.

It can be understood that when the processor 150 determines that the stylus 20 is deflected, it may continue to send communication signals periodically.

In some embodiments, in the stylus 20 offset detection method, after executing step S200, the processor 150 is further configured to execute the following step S500.

S500, if the processor 150 determines that the stylus pen 20 is deflected, the output unit 160 is controlled to output the first reminder information.

As mentioned above, after executing step S200, the processor 150 can determine whether the stylus pen 20 is deflected. In this embodiment, if the processor 150 determines that the stylus pen 20 is deflected, it also controls the output unit 160 to output the first reminder information. The first reminder information here is used to remind that the stylus pen 20 is offset. In some embodiments, output unit 160 is a speaker in electronic device 10 . At this time, the first reminder message may be a voice message. For example, when the processor 150 controls the output unit 160 to output the first reminder information, the speaker in the electronic device 10 may sound "The adsorption position of the stylus is offset, please place the stylus in the correct position." In other embodiments, the output unit 160 is a display screen in the electronic device 10 . At this time, the first reminder information may be text information or/and image information. In a specific embodiment, when the processor 150 controls the output unit 160 to output the first reminder information, as shown in FIG. 38 , the display screen in the electronic device 10 displays the text information of "stylus pen adsorption position offset". In another specific embodiment, when the processor 150 controls the output unit 160 to output the first reminder information, as shown in FIG. 39 , the display screen in the electronic device 10 displays "The adsorption position of the stylus is offset. Please move the stylus." "Place it in the correct position" text information, and at the same time display the relative position of the stylus pen 20 and the electronic device 10 when the stylus pen 20 adsorbs the electronic device 10 at the correct position (ie, the preset adsorption position).

In some specific embodiments, "controlling the output unit 160 to output the first reminder information" in step S500 is executed by the second sub-processor 154 of the processor 150 .

The following is a detailed explanation of the stylus 20 offset detection method provided by the embodiment of the present application from four specific implementation modes with reference to the accompanying drawings.

First specific implementation.

In this implementation, the processor 150 first determines whether an offset occurs based on the quality factor of the transmitting coil 110 , and then determines whether the device adsorbed on the electronic device 10 is the stylus 20 by sending communication signals and receiving feedback signals.

Specifically, FIG. 40 is a flow chart of another stylus 20 offset detection method provided by an embodiment of the present application. This stylus 20 offset detection method can be applied to the electronic device 10 shown in FIG. 33 . As shown in Figure 40, the stylus 20 offset detection method may include the following steps.

S1, quality factor detection.

After the first sub-processor 152 is powered on, it can first control the first switch Q1 and the third switch Q3 to be turned on within the first preset time period, thereby charging the capacitor C and the transmitting coil 110 within the first preset time period, so that the capacitor C and transmitter coil 110 are in steady state. After that, the first sub-processor 152 then controls the second switch Q2 and the third switch Q3 to turn on, so that the second plate of the capacitor C is connected to the second end of the transmitting coil 110. At this time, the first plate of the capacitor C and An oscillating electrical signal is generated between the first ends of the transmitting coil 110 . The first sub-processor 152 can detect the oscillating electrical signal, and determine the transmitting coil 110 through equation ① and equation ⑥ according to the n-1th amplitude and the n-th amplitude among the multiple amplitudes of the oscillating electrical signal. quality factor.

Here, the first sub-processor 152 may detect the quality factor of the transmitting coil 110 every third preset time interval.

A first threshold and a second threshold are preset in the first sub-processor 152, and the first threshold is smaller than the second threshold. After the first sub-processor 152 detects the quality factor of the transmitting coil 110, it can determine the relationship between the quality factor and the first threshold and the second threshold. The relationship between the quality factor and the first threshold and the second threshold includes three of the following steps S2, S3 and S4.

S2, the quality factor is greater than the first threshold and less than the second threshold.

When the quality factor of the transmitting coil 110 is greater than the first threshold and less than the second threshold, it indicates that the change in the quality factor of the transmitting coil 110 is small. In this case, the first sub-processor 152 determines that there is no stylus, metal debris or ferrite debris adsorbed on the electronic device 10. At this time, it returns to step S1, that is, it detects again every third preset time interval. Quality factor of primary transmit coil 110.

S3, the quality factor is less than or equal to the first threshold.

When the quality factor of the transmitting coil 110 is less than or equal to the first threshold, it indicates that metal is close to the transmitting coil 110. At this time, the first sub-processor 152 determines that an offset occurs. In this case, the first sub-processor 152 continues to execute steps S31 to S33.

S31. Send communication signals.

The first sub-processor 152 sends communication signals. The first sub-processor 152 may transmit the communication signal by modulating the waveform of the electrical signal on the transmit coil 110 .

S32: Determine whether the feedback signal is received within the second preset time period after sending the communication signal.

If the first sub-processor 152 receives a feedback signal for the communication signal within the second preset time period after sending the communication signal, it indicates that the first sub-processor 152 is able to communicate with the stylus 20, that is, it indicates that the electronic The device on device 10 is a stylus. At this time, the first sub-processor 152 determines that the stylus pen 20 is deflected, and executes step S33.

If the first sub-processor 152 does not receive a feedback signal for the communication signal within the second preset time period after sending the communication signal, it indicates that the first sub-processor 152 is unable to communicate with the stylus 20, that is, it indicates that the adsorption The device on electronic device 10 is not a stylus. At this time, return to step S1.

S33, output the first reminder information.

After the first sub-processor 152 determines that the stylus pen 20 is deflected, it can issue a first instruction to the second sub-processor 154 . After receiving the first instruction, the second sub-processor 154 outputs the first reminder message to remind the user that the stylus pen 20 is deflected.

S4, the quality factor is greater than or equal to the second threshold.

When the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, it indicates that ferrite is close to the transmitting coil 110. At this time, the first sub-processor 152 determines that no offset occurs. In this case, the first sub-processor 152 continues to execute steps S41 to S43.

S41. Send communication signals.

S42: Determine whether the feedback signal is received within the second preset time period after sending the communication signal.

If the first sub-processor 152 receives a feedback signal for the communication signal within the second preset time period after sending the communication signal, it indicates that the first sub-processor 152 is able to communicate with the stylus 20, that is, it indicates that the electronic The device on device 10 is a stylus. At this time, the first sub-processor 152 determines that the stylus pen 20 does not shift, and executes step S43.

If the first sub-processor 152 does not receive a feedback signal for the communication signal within the second preset time period after sending the communication signal, it indicates that the first sub-processor 152 is unable to communicate with the stylus 20, that is, it indicates that the adsorption The device on electronic device 10 is not a stylus. At this time, return to step S1.

S43, stop detecting the quality factor, and control the transmitting coil 110 to output electric energy.

The first sub-processor 152 can control the first switch Q1 and the third switch Q3 to turn on, and control the second switch Q2 and the fourth switch Q4 to turn off in the first stage; and control the second switch Q2 and the fourth switch Q4 to turn off in the second stage. The fourth switch Q4 is turned on, and the first switch Q1 and the third switch Q3 are controlled to be turned off. By repeating this cycle, alternating current can be output to the capacitor C and the transmitting coil 110, so that the transmitting coil 110 can output electric energy.

The second specific implementation.

FIG. 41 is a flow chart of yet another method for detecting the offset of the stylus 20 provided by an embodiment of the present application, which has the following difference based on the embodiment shown in FIG. 40 .

1) If the judgment result in step S32 and step S42 is no, return to step S1 and also execute step S5.

S5, output the second reminder information.

When the first sub-processor 152 does not receive a feedback signal for the communication signal within the second preset time period after sending the communication signal, that is, when the first sub-processor 152 is unable to communicate with the stylus 20, it may send a request to the third sub-processor 152. The second sub-processor 154 issues a second instruction. The second sub-processor 154 outputs the second reminder information after receiving the second instruction. The second reminder message is used to remind the user not to bring metal debris or ferrite debris close to the transmitting coil 110 .

The third specific implementation mode.

FIG. 42 is a flow chart of yet another method for detecting offset of the stylus 20 provided by an embodiment of the present application. It has the following differences based on the embodiment shown in FIG. 40 .

1) The first sub-processor 152 is not preset with the first threshold and the second threshold, but is preset with the third threshold, the fourth threshold and the preset quality factor. The third threshold is less than the fourth threshold. In this embodiment, the third threshold and the fourth threshold should satisfy the following conditions: when the stylus 20 is adsorbed at the preset adsorption position on the electronic device 10 , that is, when situations (A) and (B) occur, the first The fourth threshold is less than or equal to the difference between the quality factor of the transmitting coil 110 minus the preset quality factor; when the adsorption position of the stylus 20 on the electronic device 10 is shifted, that is, situations (1), (2), and (5) , (6), (7), (8), (11), and (12) occur, the third threshold is greater than or equal to the difference between the quality factor of the transmitting coil 110 minus the preset quality factor. In this case, if the stylus 20 is adsorbed on the electronic device 10 and the first sub-processor 152 detects that the difference between the quality factor of the transmitting coil 110 minus the preset quality factor is greater than or equal to the fourth threshold, it can be determined The stylus pen 20 is adsorbed at the preset adsorption position on the electronic device 10 , that is, there is no deviation of the stylus pen 20 . On the contrary, if the stylus 20 is adsorbed on the electronic device 10 and the first sub-processor 152 detects that the difference between the quality factor of the transmitting coil 110 minus the preset quality factor is less than or equal to the third threshold, it can be determined that the stylus 20 The adsorption position is shifted.

Here, the preset quality factor is the quality factor of the transmitting coil 110 when the electronic device 10 is not attracted to the stylus 20 , and the electronic device 10 is not attracted to other metal impurities and ferrite impurities, that is, only the electronic device 110 is The quality factor of the transmitter coil 110 at 10 o'clock. The preset quality factor is greater than the first threshold and less than the second threshold. The third threshold may be equal to the difference between the first threshold minus the preset quality factor, and the third threshold may be a negative value. The fourth threshold may be equal to the second threshold minus the preset quality factor.

Based on this, based on the first specific implementation, the following step S6 may be performed after step S1.

S6: Calculate the difference between the quality factor and the preset quality factor.

After detecting the quality factor of the transmitting coil 110, the first sub-processor 152 calculates the difference between the detected quality factor and the preset quality factor (hereinafter referred to as "difference"). In this way, the relationship between the difference and the third threshold and the fourth threshold can be determined. The relationship between the difference value and the third threshold value and the fourth threshold value includes the following three types of steps S7, S8 and S9.

S7, the difference is greater than the third threshold and less than the fourth threshold.

According to the foregoing description, when the difference meets the condition of step S7, the quality factor of the transmitting coil 110 meets the condition of step S2. Therefore, the execution returns to step S1 at this time.

S8, the difference is less than or equal to the third threshold.

According to the foregoing description, it can be known that when the difference meets the condition of step S8, the quality factor of the transmitting coil 110 meets the condition of step S3. Therefore, step S31 is continued at this time.

S9, the difference is greater than or equal to the fourth threshold.

According to the foregoing description, when the difference meets the condition of step S9, the quality factor of the transmitting coil 110 meets the condition of step S4. Therefore, step S41 is continued at this time.

The fourth specific implementation mode.

In this embodiment, the processor 150 first determines whether the device adsorbed on the electronic device 10 is the stylus 20 by sending communication signals and receiving feedback signals (or in other words, determining whether the stylus 20 is connected to the electronic device 10 by sending communication signals and receiving feedback signals). The electronic device 10 is absorbed), if so, the processor 150 then detects the quality factor of the transmitting coil 110, and determines whether an offset occurs according to the quality factor of the transmitting coil 110.

Specifically, FIG. 43 is a flow chart of yet another method for detecting the offset of the stylus 20 provided by an embodiment of the present application. The method for detecting the offset of the stylus 20 can be applied to the electronic device 10 shown in FIG. 33 . As shown in Figure 43, the stylus 20 offset detection method may include the following steps.

S01, send communication signal.

The first sub-processor 152 sends communication signals after being powered on. The first sub-processor 152 may transmit the communication signal by modulating the waveform of the electrical signal on the transmit coil 110 . Here, the first sub-processor 152 may send the communication signal once every fourth preset time interval.

S02, determine whether a feedback signal is received within a second preset time period after sending the communication signal.

If the first sub-processor 152 receives a feedback signal for the communication signal within the second preset time period after sending the communication signal, it indicates that the first sub-processor 152 is able to communicate with the stylus 20 , that is, it indicates that the stylus 20 Adsorbed to the electronic device 10 . At this time, step S03 is executed.

If the first sub-processor 152 does not receive a feedback signal for the communication signal within the second preset time period after sending the communication signal, it indicates that the first sub-processor 152 is unable to communicate with the stylus 20, that is, it indicates that the handwriting The pen 20 is not adsorbed to the electronic device 10 . At this time, return to step S01. In some other embodiments, if the determination result in step S02 is no, step S5 may also be executed while returning to step S1.

S03, quality factor detection.

The first sub-processor 152 may first control the first switch Q1 and the third switch Q3 to be turned on within the first preset time period, thereby charging the capacitor C and the transmitting coil 110 within the first preset time period, so that the capacitor C and the transmitting coil 110 is at steady state. After that, the first sub-processor 152 then controls the second switch Q2 and the third switch Q3 to turn on, so that the second plate of the capacitor C is connected to the second end of the transmitting coil 110. At this time, the first plate of the capacitor C and An oscillating electrical signal is generated between the first ends of the transmitting coil 110 . The first sub-processor 152 can detect the oscillating electrical signal, and determine the transmitting coil 110 through equation ① and equation ⑥ according to the n-1th amplitude and the n-th amplitude among the multiple amplitudes of the oscillating electrical signal. quality factor.

A first threshold and a second threshold are preset in the first sub-processor 152, and the first threshold is smaller than the second threshold. After the first sub-processor 152 detects the quality factor of the transmitting coil 110, it can determine the relationship between the quality factor and the first threshold and the second threshold. The relationship between the quality factor and the first threshold and the second threshold includes the following three types of steps S04, S05, and S06.

S04, the quality factor is greater than the first threshold and less than the second threshold.

When the quality factor of the transmitting coil 110 is greater than the first threshold and less than the second threshold, it indicates that the change in the quality factor of the transmitting coil 110 is small. In this case, the feedback signal may be received incorrectly. At this time, step S01 is returned to execution, that is, the communication signal is sent again every fourth preset time interval.

S05, the quality factor is less than or equal to the first threshold.

When the quality factor of the transmitting coil 110 is less than or equal to the first threshold, it indicates that metal is close to the transmitting coil 110. At this time, the first sub-processor 152 determines that the stylus 20 is deflected. In this case, the first sub-processor 152 continues to execute step S051.

S051, output the first reminder information.

After the first sub-processor 152 determines that the stylus pen 20 is deflected, it can issue a first instruction to the second sub-processor 154 . After receiving the first instruction, the second sub-processor 154 outputs the first reminder message to remind the user that the stylus pen 20 is deflected.

S06, the quality factor is greater than or equal to the second threshold.

When the quality factor of the transmitting coil 110 is greater than or equal to the second threshold, it indicates that ferrite is close to the transmitting coil 110. At this time, the first sub-processor 152 determines that the stylus pen 20 does not shift. In this case, the first sub-processor 152 continues to execute step S061.

S061, stop sending communication signals, and control the transmitting coil 110 to output electric energy.

The first sub-processor 152 can control the first switch Q1 and the third switch Q3 to turn on, and control the second switch Q2 and the fourth switch Q4 to turn off in the first stage; and control the second switch Q2 and the fourth switch Q4 to turn off in the second stage. The fourth switch Q4 is turned on, and the first switch Q1 and the third switch Q3 are controlled to be turned off. By repeating this cycle, alternating current can be output to the capacitor C and the transmitting coil 110, so that the transmitting coil 110 can output electric energy.

The stylus 20 offset detection method provided by the embodiment of the present application has at least the following beneficial effects: 1. The processor 150 can detect the quality factor of the transmitting coil 110 . Since the quality factor of the transmitting coil 110 is different when the stylus 20 is offset and when the stylus 20 is not offset, the processor 150 can determine the quality factor according to the quality factor of the transmitting coil 110 after detecting the quality factor of the transmitting coil 110 Whether the stylus 20 adsorbed on the electronic device 10 is deflected. In this way, it can be detected whether the adsorption position of the stylus 20 on the electronic device 10 is shifted. 2. This stylus 20 offset detection method only needs to detect the quality factor of the transmitting coil 110 and send and receive communication signals through the transmitting coil 110. It does not require auxiliary devices such as Hall sensors or compasses to determine whether the stylus 20 is close. The electronic device 10 can save costs.

The embodiment of the present application also provides a method for detecting the offset of the stylus 20, including the following steps S601 and S602.

S601, the processor 150 detects the quality factor of the transmitting coil 110 in the electronic device 10.

S602: If the processor 150 determines that the stylus 20 is deflected according to the quality factor of the transmitting coil 110, it outputs the first reminder information.

In some embodiments, the first reminder information is used to remind that the stylus pen 20 is deflected. In other words, the first reminder information is used to remind the adsorption position of the stylus pen 20 on the electronic device 10 to deviate from the preset adsorption position.

The embodiment of the present application also provides an electronic device 10, as shown in Figure 44, including a transmitting coil 110, a memory 170, a processor 150, and a computer program stored in the memory 170 and executable on the processor 150. The computer program is When executed, the processor 150 implements the stylus 20 offset detection method as in any of the above embodiments.

The embodiment of the present application also provides an electronic device 10, as shown in Figure 44, including a transmitting coil 110, a memory 170, a processor 150, and a computer program stored in the memory 170 and executable on the processor 150. The computer program is When the processor 150 is executed, the processor 150 detects the quality factor of the transmitting coil 110 .

The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still implement the above-mentioned implementations. The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions in the embodiments of this application, and should be included in within the protection scope of this application.

Claims (15)

1. A stylus deflection detection method, applied to an electronic device, characterized in that the method comprises:

detecting a quality factor of a transmitting coil in the electronic device;

and determining whether a handwriting pen deviation condition occurs according to the quality factor of the transmitting coil, wherein the handwriting pen deviation condition is that the adsorption position of the handwriting pen adsorbed on the electronic equipment deviates from a preset adsorption position.

2. The method of claim 1, wherein said determining whether a stylus deflection condition is present based on a quality factor of the transmit coil comprises:

if the quality factor of the transmitting coil is smaller than or equal to a first threshold value, transmitting a communication signal;

And if the feedback signal aiming at the communication signal is received within the preset time after the communication signal is sent, determining that the offset condition of the handwriting pen occurs.

3. The method of claim 1, wherein said determining whether a stylus deflection condition is present based on a quality factor of the transmit coil comprises:

if the quality factor of the transmitting coil is greater than or equal to a second threshold value, transmitting a communication signal;

and if the feedback signal for the communication signal is received within the preset time after the communication signal is sent, determining that the offset condition of the handwriting pen does not occur.

4. A method according to claim 2 or 3, wherein said detecting the quality factor of a transmitting coil in said electronic device comprises:

periodically detecting a quality factor of the transmitting coil;

after determining whether the offset condition of the handwriting pen occurs according to the quality factor of the transmitting coil, the method further comprises the following steps:

if the fact that the offset condition of the handwriting pen does not occur is determined, stopping detecting the quality factor of the transmitting coil;

and controlling the transmitting coil to output electric energy.

5. The method of claim 1, wherein prior to detecting the quality factor of the transmit coil in the electronic device, further comprising:

Transmitting a communication signal;

and if the feedback signal for the communication signal is received within the preset time after the communication signal is sent, executing the step of detecting the quality factor of the transmitting coil in the electronic equipment.

6. The method of claim 5, wherein said determining whether a stylus deflection condition is present based on a quality factor of the transmit coil comprises:

and if the quality factor of the transmitting coil is smaller than or equal to a first threshold value, determining that the handwriting pen deviation condition occurs.

7. The method of claim 5 or 6, wherein said determining whether a stylus deflection condition is occurring based on a quality factor of the transmit coil further comprises:

and if the quality factor of the transmitting coil is greater than or equal to a second threshold value, determining that the offset condition of the handwriting pen does not occur.

8. The method according to any one of claims 5 to 7, wherein the transmitting the communication signal comprises:

periodically transmitting the communication signal;

after determining whether the offset condition of the handwriting pen occurs according to the quality factor of the transmitting coil, the method further comprises the following steps:

if the handwriting pen deviation condition is not determined to occur, stopping sending the communication signal;

And controlling the transmitting coil to output electric energy.

9. The method of any one of claims 1 to 8, wherein after determining whether a stylus deflection condition has occurred based on the quality factor of the transmit coil, further comprising:

if the offset condition of the handwriting pen is determined to occur, outputting reminding information, wherein the reminding information is used for reminding the occurrence of the offset condition of the handwriting pen.

10. The method of any of claims 1 to 9, wherein the electronic device further comprises a capacitor, a first plate of the capacitor being connected to the first end of the transmit coil;

the detecting the quality factor of the transmitting coil includes:

charging the capacitor and the transmitting coil until both the capacitor and the transmitting coil are in steady state;

controlling the second polar plate of the capacitor to be connected with the second end of the transmitting coil so as to generate an oscillating electric signal between the first polar plate of the capacitor and the first end of the transmitting coil;

and determining the quality factor of the transmitting coil according to the (n-1) th amplitude value and the (n) th amplitude value in the plurality of amplitude values of the oscillating electric signal, wherein n is an integer greater than or equal to 2.

11. The method of claim 10, wherein the electronic device further comprises a first switch, a second switch, and a third switch, a first end of the first switch being configured to be connected to a positive power supply, a second end of the first switch being configured to be connected to a second plate of the capacitor and a first end of the second switch, a first end of the third switch being configured to be connected to a second end of the transmitting coil, a second end of the second switch, and a second end of the third switch being configured to be connected to a negative power supply;

said charging said capacitor and said transmitting coil, comprising:

controlling the second switch to be turned off, and controlling the first switch and the third switch to be turned on to charge the capacitor and the transmitting coil;

the second polar plate for controlling the capacitor is connected with the second end of the transmitting coil, and the second polar plate comprises:

and controlling the first switch to be turned off, and controlling the second switch and the third switch to be turned on so as to enable the second polar plate of the capacitor to be connected with the second end of the transmitting coil.

12. The method of claim 10 or 11, wherein said determining the quality factor of the transmitting coil from the n-1 th and n-th amplitude values of the plurality of amplitude values of the oscillating electrical signal comprises:

Determining the quality factor of the transmitting coil according to the n-1 th amplitude and the n-th amplitude by the following formula:

wherein, Q is the quality factor of the transmitting coil, F ((n-1) T) is the n-1 th amplitude, F (nT) is the n-th amplitude, pi is the circumference ratio, and ln () is the logarithm based on natural constant.

13. A stylus deflection detection method, applied to an electronic device, characterized in that the method comprises:

detecting a quality factor of a transmitting coil in the electronic device;

if the condition of the offset of the handwriting pen is determined to occur according to the quality factor of the transmitting coil, outputting reminding information, wherein the reminding information is used for reminding the occurrence of the condition of the offset of the handwriting pen, and the condition of the offset of the handwriting pen is that the adsorption position of the handwriting pen adsorbed on the electronic equipment is offset relative to a preset adsorption position.

14. An electronic device comprising a transmit coil, a memory, a processor, and a computer program stored in the memory and executable on the processor, which when executed by the processor, implements the method of any one of claims 1 to 13.

15. An electronic device comprising a transmit coil, a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program when executed by the processor detecting a quality factor of the transmit coil.