WO2018035843A1

WO2018035843A1 - Signal transmitting method, signal parsing method, active pen and touch screen

Info

Publication number: WO2018035843A1
Application number: PCT/CN2016/096869
Authority: WO
Inventors: 戴石礼
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2016-08-26
Filing date: 2016-08-26
Publication date: 2018-03-01
Also published as: CN107969152A

Abstract

The present invention relates to the technical field of electronic information. Disclosed are a signal transmitting method, a signal parsing method, an active pen and a touch screen. In the present invention, the signal transmitting method comprises: the active pen performing frequency modulation on information to be delivered to generate a frequency-modulated signal of the information to be delivered; and the active pen transmitting the frequency-modulated signal of the information to be delivered. Also provided are a signal parsing method, an active pen and a touch screen. The signal transmitting method, the signal parsing method, the active pen and the touch screen provided in the present invention greatly improve the refresh rate and solve the problem that the timing sequence of signal transmission of the active pen and screen terminal detection is complex, and information delivery is time-consuming.

Description

Signal transmission method, signal analysis method, active pen and touch screen

Technical field

The present invention relates to the field of electronic information technology, and in particular, to a signal transmitting method, a signal analyzing method, an active pen, and a stylus.

Background technique

The existing active pen generally has a pressure detecting function, and the pressure sensor of the pen tip senses the magnitude of the pressure, and then transmits the pressure information to the screen end in a certain manner. There are many ways to transmit pressure information. There is a direct transmission of pressure information to the whole machine via Bluetooth, such as apple pencil. There is also a certain modulation of the pressure information through the pen tip and then receiving through the screen, such as the surface pro 4 active pen. For the receiving method of the pen tip signal modulation pressure transmitted to the screen end, not only the pressure information needs to be transmitted to the screen, but also a signal is needed at the pen tip to position the pen tip on the screen end. Therefore, the active pen that transmits the pressure information through the pen tip signal generally needs two parts for the signal emitted by the pen tip, one part for transmitting pressure and the other part for positioning the pen point coordinates.

At present, the coding timing of an active pen commonly seen on the market is as shown in Fig. 1: its tip position is coded with a fixed frequency of 2.4ms, and the pressure is modulated by amplitude modulation, because it uses binary coding. Modulation, so the information can only be transmitted through the combined encoding of 1 and 0. To achieve the pressure of 1024, 10-bit pressure coding is required, and with other processing, the coding period of the entire pen takes 5 ms.

However, in the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: the common active pen coding timing under the condition of only supporting the pen detection, the refresh rate barely reaches 200 Hz, if the finger and pen touch are to be supported. At the same time, the refresh rate will drop significantly. For the receiving method in which the pen tip signal modulation pressure is transmitted to the screen end, generally, the pen tip signal and the screen end signal are different. In this way, the processing and processing of the pen end is more complicated, and the timing of the pen tip signal and the timing of the signal acquisition of the screen end are better synchronized, otherwise the signal will be lost, and the conversion of the two signals will cause a waste of time. The refresh rate is difficult to improve.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a signal transmission, a signal analysis, an active pen, and a touch screen. By simplifying the timing of active pen coding and screen end detection, the transmission time of information to be transmitted is reduced, and the refresh rate is greatly improved.

To solve the above technical problem, an embodiment of the present invention provides a signal transmission method, which is applied to an active pen, and specifically includes: the active pen performs frequency modulation on a message to be transmitted to generate an information modulation signal to be transmitted; Transmitting the information to be transmitted to the FM signal.

The embodiment of the present invention further provides a signal analysis method, which is applied to a touch screen, and specifically includes: the touch screen performs frequency demodulation on the received information to be transmitted to obtain an FM signal to be transmitted. Demodulation frequency; wherein the information to be transmitted is transmitted by the active pen through the signal transmission method of the present invention; the touch screen acquires the demodulation frequency according to a preset correspondence relationship between the demodulation frequency and the information to be transmitted Corresponding information to be transmitted; the touch screen performs amplitude demodulation on the FM signal to be transmitted according to at least one preset frequency to obtain a demodulation amplitude of the FM signal to be transmitted; the touch screen is based on The demodulation amplitude calculates a nib position of the active pen.

The embodiment of the present invention further provides an active pen, which specifically includes: a frequency modulation module, configured to frequency-modulate the information to be transmitted to generate an information-modulated signal to be transmitted; and a signal transmitting module, configured to: The information FM signal is transmitted and transmitted.

The embodiment of the present invention further provides a touch screen, specifically comprising: a signal receiving module, configured to receive an information modulation signal to be transmitted by the active pen transmitted by the signal transmitting method of the present invention; and a frequency demodulation module connected to the a signal receiving module; the frequency demodulating module is configured to perform frequency demodulation on the to-be-transmitted information FM signal to obtain a demodulation frequency of the to-be-transmitted information FM signal The information acquisition module is connected to the frequency demodulation module; the information acquisition module is configured to acquire information to be transmitted corresponding to the demodulation frequency according to a preset correspondence relationship between the demodulation frequency and the information to be transmitted; a modulation module, configured to be connected to the signal receiving module; the amplitude demodulation module is configured to perform amplitude demodulation on the to-be-transmitted information FM signal according to at least one preset frequency to obtain demodulation of the FM signal to be transmitted And a position calculation module connected to the amplitude demodulation module; the position calculation module is configured to calculate a nib position of the active pen according to the demodulation amplitude.

Compared with the prior art, the active pen periodically transmits the frequency modulated signal of the information to be transmitted by frequency modulation of the information to be transmitted, thereby simplifying the process of transmitting the active pen signal and improving the process. The efficiency and refresh rate of active pen and screen information delivery.

In addition, the information to be transmitted includes a tip pressure of the active pen or a function key press signal of the active pen. The information to be transmitted is transmitted to the touch screen through the active pen, so that the touch screen can obtain specific operation information after demodulation.

In addition, when the information to be transmitted is the pen tip pressure, the modulation frequency of the information to be transmitted information and the pen tip pressure are in a one-to-one correspondence relationship. Through the one-to-one mapping relationship, a specific implementation manner of the correspondence between the modulation frequency and the nib pressure is provided to obtain the modulation frequency corresponding to the FM signal to be transmitted.

In addition, the number of the preset frequencies is one, and the preset frequency is the demodulation frequency; the to-be-transmitted information FM signal includes a first partial signal and a second partial signal that are sequentially received; The screen performs frequency demodulation on the first partial signal to obtain a demodulation frequency of the information to be transmitted, and the touch screen performs amplitude demodulation on the second partial signal according to the demodulation frequency to Obtaining a demodulation amplitude of the information to be transmitted FM signal. By performing frequency demodulation and amplitude demodulation on the first partial signal and the second partial signal received in sequence, respectively, the demodulation frequency and the demodulation amplitude of the information FM signal to be transmitted can be respectively obtained.

In addition, the number of the preset frequencies is one, and the preset frequency is a center frequency of a demodulation band of the touch screen. When the number of preset frequencies is one, by setting the preset frequency to demodulation The center frequency of the frequency band can quickly demodulate the frequency modulated signal transmitted by the active pen, and then calculate the position of the tip position of the active pen, thereby reducing the calculation amount and the requirement of hardware performance.

In addition, the number of the preset frequencies is multiple, and the plurality of preset frequencies belong to the demodulation frequency band of the touch screen, and the frequency modulation signals respectively transmitted by the active pen are respectively subjected to amplitude demodulation by using a plurality of preset frequencies. Multiple demodulation amplitudes can be obtained separately, and the preset frequency with the largest demodulation amplitude is the optimal frequency. Selecting this frequency for amplitude demodulation and using this demodulation amplitude to calculate the nib position of the active pen can improve the position of the active pen tip position. The accuracy.

DRAWINGS

1 is a schematic diagram of a coding signal generated by an active pen using amplitude modulation binary coding according to the prior art;

2 is a flow chart of a signal transmission method according to a first embodiment of the present invention;

3 is a schematic diagram of an information-modulated signal to be transmitted generated by a signal transmission method according to a first embodiment of the present invention;

4 is a flowchart of a signal analysis method according to a second embodiment of the present invention;

FIG. 5 is a flowchart of a signal analysis method according to a third embodiment of the present invention; FIG.

Figure 6 is a block diagram showing an active pen according to a fourth embodiment of the present invention;

7 is a block diagram showing a touch screen according to a fifth embodiment of the present invention;

FIG. 8 is a block schematic diagram of a touch screen according to a sixth embodiment of the present invention.

detailed description

In order to make the objects, technical solutions, and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail below. However, one of ordinary skill in the art will appreciate that In the various embodiments of the present invention, numerous technical details are set forth to provide the reader with a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

A first embodiment of the present invention relates to a signal transmission method mainly applied to an active pen. 2 is a flow chart of a signal transmission method according to the first embodiment.

First, in step 201, the active pen performs frequency modulation on the information to be transmitted, and generates an information modulation signal to be transmitted.

Specifically, if the information to be transmitted is detected, the detected information to be transmitted is frequency-modulated to generate an information-modulated signal to be transmitted.

For example, the user uses the active pen to perform a writing operation on the screen of the mobile phone. At this time, the active pen detects that the information to be transmitted needs to be transmitted, for example, the information to be transmitted is the tip pressure F. The active pen frequency-modulates the tip pressure to obtain an information-modulated signal to be transmitted. FIG. 3 is a schematic diagram of an information frequency modulation signal to be transmitted. In fact, the information to be transmitted and the modulation frequency are one-to-one mapping relationship, and the mapping relationship can be pre-stored in the active pen. The information to be transmitted is, for example, the tip pressure F. Preferably, the tip pressure and the modulation frequency may be linear, but are not limited thereto. In addition, the information to be transmitted may be the pressure of the pen tip pressure, and may also be the active pen function key pressing information, etc., which is not limited in this embodiment. In addition, in practical applications, other multi-ary numbers may be used according to the operation in the frequency modulation mode, and the corresponding frequency-modulated signal to be transmitted is obtained by frequency modulation.

Next, in step 202, the active pen transmits the information to be transmitted to the FM signal.

For example, through the above step 201, each time an FM signal is obtained, the active pen transmits the frequency modulated signal obtained by each frequency modulation.

In this embodiment, the active pen only needs to transmit a frequency modulation signal to be transmitted within one cycle, so that the screen can use the signal to obtain specific information carried in the information to be transmitted, such as the size of the nib pressure or the function of the active pen. The key presses the specific content of the information, and does not need to divide the information to be transmitted and the tip coordinate information into two parts for differential transmission, thereby simplifying the signal transmission of the active pen.

A second embodiment of the present invention relates to a signal analysis method, which is mainly applied to a touch screen included in an electronic device, such as a mobile phone and a tablet computer, as shown in FIG.

In step 401, the touch screen performs frequency demodulation on the received information FM signal to be transmitted to obtain a demodulation frequency of the information FM signal to be transmitted.

Specifically, when the information to be transmitted is detected, it is necessary to confirm whether the information to be transmitted is the information to be transmitted by the active pen, and if the information is to be transmitted by the active pen, the information is to be transmitted. Performing an analysis operation; if it is not the information to be transmitted by the active pen to transmit the information, it continues to detect whether there is an information to be transmitted by the active pen.

For example, the touch screen detects the to-be-transmitted information FM signal f transmitted by the active pen through the coupling capacitance between the sensing channel on the screen and the active pen tip, and then performs frequency demodulation on the FM signal to be transmitted. Demodulation, a demodulation frequency M corresponding to the information-modulated signal f to be transmitted is obtained.

In step 402, the touch screen acquires information to be transmitted corresponding to the demodulation frequency according to the preset correspondence between the demodulation frequency and the information to be transmitted.

The preset correspondence between the demodulation frequency and the information to be transmitted is pre-stored in the touch screen. For example, according to the preset correspondence between the demodulation frequency and the information to be transmitted, the information to be transmitted corresponding to the demodulation frequency M is F, that is, the information to be transmitted received by the touch screen from the active pen is F.

In step 403, the touch screen performs amplitude demodulation on the information-modulated signal to be transmitted according to the preset frequency to obtain a demodulation amplitude of the information-modulated signal to be transmitted.

Specifically, in the present embodiment, the number of preset frequencies is one, and the preset frequency is a demodulation frequency. After sequentially receiving the information to be transmitted including the first partial signal and the second partial signal, the touch screen frequency demodulates the first partial signal to obtain a demodulation frequency of the information to be transmitted, and then according to the demodulation frequency The second part of the signal is subjected to amplitude demodulation to obtain a demodulation amplitude of the information to be transmitted.

In step 404, the touch screen calculates the nib position of the active pen based on the demodulation amplitude.

Specifically, an ITO (Indium Tin Oxide Semiconductor) channel is arranged in the lateral direction and the vertical direction on the touch screen of the electronic device to form a grid shape. The ITO channel is equivalent to a signal receiving line. When the active pen is placed at a certain position on the touch screen, the transmitted signal is received by multiple ITO channels at the location. The closer the signal is received on the ITO channel closer to the active pen tip signal emission point, the smaller the converse. By demodulating the amplitude of the signal received on each ITO channel and accurately calculating the amplitude of the horizontal or vertical signal by interpolation, the position coordinates of the active pen tip can be calculated.

In this embodiment, since the active pen uses the same signal to transmit the tip pressure and coordinate information, the touch screen does not need to strictly distinguish the signal type, and only needs to pass the coupling capacitance between the sensing channel on the screen and the active pen tip. Obtaining a continuous frequency-modulated signal to be transmitted, obtaining the content of the information to be transmitted by demodulating according to the demodulation frequency, and accurately obtaining the specific content of the information to be transmitted according to the preset mapping relationship in the touch screen, simplifying Screen detection timing; and when transmitting the same level of pressure information under the same hardware conditions, compared with the existing amplitude modulation coding transmission, the information transmission efficiency and the correct rate of signal analysis are improved, so that the entire information interaction cycle time Shorten and increase the refresh rate.

A third embodiment of the present invention relates to a signal analysis method, which is mainly applied to a touch screen included in an electronic device, such as a mobile phone and a tablet computer. The main difference between this embodiment and the second embodiment is: In the embodiment, the preset frequency is only one, and the preset frequency is a demodulation frequency. In this embodiment, the preset frequency may be one or multiple, and when the preset frequency is one, a preset The frequency is the center frequency of the demodulation band; when the preset frequency is multiple, the preset frequency belongs to the demodulation band of the touch screen, and one of the preset frequencies is the center frequency of the demodulation band, and the specific operation flow is as follows: Figure 5 shows.

Steps 501 and 502 are identical to

steps

201 and 202 in FIG. 2, and are designed to perform frequency demodulation on the received information to be transmitted by the touch screen to obtain information to be transmitted. The demodulation frequency of the FM signal will not be described here. In this embodiment, at least one preset frequency is stored in the touch screen, and the touch screen performs the amplitude demodulation of the information FM signal according to the at least one preset frequency.

In step 503, the touch screen performs amplitude demodulation on the information-modulated signal to be transmitted according to the at least one preset frequency to obtain a demodulation amplitude of the information-modulated signal to be transmitted.

Specifically, at least one preset frequency is stored in the touch screen. When the number of preset frequencies is one, the preset frequency is the center frequency of the demodulation frequency band of the touch screen, and the touch screen performs the amplitude demodulation of the information frequency modulation signal according to the preset frequency to obtain the information frequency modulation signal to be transmitted. Demodulation amplitude. For example, if only one preset demodulation frequency is stored in advance in the touch screen, the preset demodulation frequency should be the center frequency of the demodulation band of the touch screen, and the touch screen should transmit the information FM signal according to the center frequency. f performs amplitude demodulation to obtain a demodulation amplitude R.

When the number of preset frequencies is one, by setting the preset frequency as the center frequency of the demodulation band, the amplitude modulation signal of the active pen can be quickly demodulated, and then the position of the tip position of the active pen can be calculated. This reduces the amount of computation and hardware performance requirements.

If the number of preset frequencies is multiple, multiple preset frequencies belong to the demodulation band of the touch screen, and one of the preset frequencies is the center frequency of the demodulation band, and the other preset frequencies are the center frequency. The nearby frequency; the touch screen is subjected to amplitude demodulation according to each preset frequency, and a plurality of demodulation amplitudes are obtained, and then the maximum demodulation amplitude is selected as the basis for calculating the nib coordinates. For example, three preset demodulation frequencies are pre-stored in the touch screen, so that the touch screen can perform amplitude demodulation on the information-modulated signals to be transmitted according to the three preset frequencies, and obtain three demodulation amplitudes. And by selecting the largest demodulation amplitude by comparison as the basis for calculating the nib coordinates.

The frequency modulation signals respectively transmitted by the active pen are respectively subjected to amplitude demodulation by using a plurality of preset frequencies, and a plurality of demodulation amplitudes can be respectively obtained, and the preset frequency with the largest demodulation amplitude is an optimal frequency, and the frequency is selected for amplitude demodulation. And using this demodulation amplitude to calculate the position of the tip of the active pen can improve the initiative The accuracy of the pen tip position coordinates.

It should be noted that the demodulation frequency band referred to in the present embodiment is a demodulation frequency range corresponding to the pressure range.

Next, in step 504, the touch screen calculates the nib position of the active pen according to the demodulation amplitude.

Specifically, the ITO channel is arranged in the horizontal direction and the vertical direction on the touch screen of the electronic device to form a grid shape. The ITO channel is equivalent to a signal receiving line. When the active pen is placed at a certain position on the touch screen, the transmitted signal is received by multiple ITO channels at the location. The closer the signal is received on the ITO channel closer to the active pen tip signal emission point, the smaller the converse. By demodulating the amplitude of the signal received on each ITO channel and accurately calculating the amplitude of the horizontal or vertical signal by interpolation, the precise position of the pen tip in the horizontal and vertical directions can be calculated.

In this embodiment, since the information frequency modulation signal is to be subjected to amplitude demodulation according to the preset frequency, the acquisition of the information to be transmitted and the calculation of the position of the nib may be performed synchronously, and reasonable multiplexing is performed in the parsing time. This can shorten the analysis time. However, this embodiment does not impose any limitation on this.

The steps of the above various methods are divided for the sake of clear description. The implementation may be combined into one step or split into certain steps and decomposed into multiple steps. As long as the same logical relationship is included, it is within the protection scope of this patent. The addition of insignificant modifications to an algorithm or process, or the introduction of an insignificant design, without changing the core design of its algorithms and processes, is covered by this patent.

A fourth embodiment of the present invention relates to an active pen, and the specific structure is as shown in FIG. 6.

The active pen includes a frequency modulation module 601 and a signal transmission module 602.

It should be noted that the active pen in this embodiment is mainly used in conjunction with a smart terminal including a touch screen, such as a mobile phone or a tablet computer.

a frequency modulation module 601, configured to perform frequency modulation on the information to be transmitted, to generate a to-be-delivered message Interest frequency signal;

The signal transmitting module 602 is connected to the frequency modulation module 601, and the signal transmitting module 602 is configured to transmit the information FM signal to be transmitted.

It is not difficult to find that the present embodiment is a system embodiment corresponding to the first embodiment, and the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still effective in the present embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the first embodiment.

It is worth mentioning that each module involved in this embodiment is a logic module. In practical applications, a logical unit may be a physical unit, a part of a physical unit, or multiple physical entities. A combination of units is implemented. In addition, in order to highlight the innovative part of the present invention, the present embodiment does not introduce a unit that is not closely related to solving the technical problem proposed by the present invention, but this does not mean that there are no other units in the present embodiment.

The fifth embodiment of the present invention relates to a touch screen. The touch screen in the present embodiment is mainly applicable to a smart terminal including a touch screen, such as a mobile phone and a tablet computer. The specific structure is as shown in FIG. 7. The touch screen includes: a signal receiving module 701, a frequency demodulating module 702, an information acquiring module 703, an amplitude demodulating module 704, and a position calculating module 705.

The signal receiving module 701 is configured to receive an information modulation signal to be transmitted that is sent by the active pen according to the signal transmission method;

The frequency demodulation module 702 is connected to the signal receiving module 701; the frequency demodulating module 702 is configured to perform frequency demodulation on the information-modulated signal to be transmitted to obtain a demodulation frequency of the information-modulated signal to be transmitted;

The information acquisition module 703 is connected to the frequency demodulation module 702. The information acquisition module 703 is configured to acquire information to be transmitted corresponding to the demodulation frequency according to the preset correspondence between the demodulation frequency and the information to be transmitted.

The amplitude demodulation module 704 is connected to the signal receiving module 701 and the frequency demodulation module 702. The amplitude demodulation module 704 is configured to perform amplitude demodulation according to the FM signal of the transmission information to obtain a demodulation amplitude of the FM signal to be transmitted.

The touch screen in this embodiment is mainly applied to a preset number of frequencies, and the preset frequency is a demodulation frequency.

When the preset frequency is the demodulation frequency, the signal receiving module 701 transmits the first part of the received information to be transmitted to the frequency demodulation module 702 for frequency demodulation, and obtains a demodulation frequency of the information to be transmitted. The amplitude demodulation module 704 then performs amplitude demodulation on the second portion of the signal to be transmitted according to the demodulation frequency, and finally obtains the demodulation amplitude of the information to be transmitted, and transmits the demodulated amplitude to the position calculation module 705.

The location calculation module 705 is coupled to the amplitude demodulation module 704; the location calculation module 705 is configured to calculate the nib position of the active pen based on the demodulation amplitude.

Since the second embodiment and the present embodiment correspond to each other, the present embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still effective in the present embodiment, and the technical effects that can be achieved in the second embodiment can also be implemented in the present embodiment. To reduce the repetition, details are not described herein again. Accordingly, the related art details mentioned in the present embodiment can also be applied to the second embodiment.

A sixth embodiment of the present invention relates to a touch screen. The touch screen in the present embodiment is mainly applicable to a smart terminal including a touch screen, such as a mobile phone and a tablet computer. The specific structure of the touch screen in this embodiment is similar to that of the touch screen in the fifth embodiment. Referring to FIG. 8 , the touch screen in this embodiment includes a signal receiving module 701 , a frequency demodulation module 702 , and information. The acquisition module 703, the amplitude demodulation module 704, and the location calculation module 705.

The frequency demodulation module 702 is connected to the signal receiving module 701; the frequency demodulating module 702 is used for Passing the information FM signal to perform frequency demodulation to obtain a demodulation frequency of the information FM signal to be transmitted;

The amplitude demodulation module 704 is connected to the signal receiving module 701. The amplitude demodulation module 704 is configured to perform amplitude demodulation according to the FM signal of the transmission information to obtain a demodulation amplitude of the FM signal to be transmitted.

The touch screen in this embodiment is mainly used when the preset frequency is one or more, and when the preset frequency is one, the preset frequency is the center frequency of the demodulation frequency band; when the preset frequency is multiple, The preset frequencies belong to the demodulation band of the touch screen, and one of the preset frequencies is the center frequency of the demodulation band.

Since the preset frequency in the embodiment is one or more frequencies that are pre-selected for storage, the amplitude demodulation module 704 is only connected to the signal receiving module 701, and the signal receiving module 701 will receive the information to be transmitted in the FM signal. The amplitude demodulation module 704 is directly passed to the amplitude modulation signal to be transmitted, and finally the demodulation amplitude of the information to be transmitted is obtained, and the demodulation amplitude is transmitted to the position calculation module 705.

It is not difficult to find that the present embodiment is a system embodiment corresponding to the third embodiment, and the present embodiment can be implemented in cooperation with the third embodiment. The related technical details mentioned in the third embodiment are still effective in the present embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the third embodiment.

Those skilled in the art can understand that all or part of the steps in implementing the foregoing embodiments may be completed by a program instructing related hardware, and the program is stored in a storage medium. A number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

A person skilled in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and various changes can be made in the form and details without departing from the spirit and scope of the present invention. range.

Claims

A signal transmission method is characterized in that it is applied to an active pen, and the signal transmission method includes:

The active pen performs frequency modulation on the information to be transmitted to generate an information frequency modulation signal to be transmitted;

The active pen transmits the information to be transmitted to the FM signal.
The signal transmitting method according to claim 1, wherein the information to be transmitted includes a tip pressure of the active pen and/or a function key pressing signal of the active pen.
The signal transmitting method according to claim 2, wherein when the information to be transmitted is a pen tip pressure, a modulation relationship between a modulation frequency of the information-modulated signal to be transmitted and the tip pressure is one-to-one correspondence.
A signal analysis method is applied to a touch screen, and the signal analysis method includes:

The touch screen performs frequency demodulation on the received information FM signal to be transmitted to obtain a demodulation frequency of the FM signal to be transmitted; wherein the information to be transmitted is controlled by the active pen according to any one of claims 1 to 3. A signal transmission method as described above is transmitted;

The touch screen acquires information to be transmitted corresponding to the demodulation frequency according to a preset correspondence between the demodulation frequency and the information to be transmitted;

The touch screen performs amplitude demodulation on the to-be-transmitted information FM signal according to at least one preset frequency to obtain a demodulation amplitude of the to-be-transmitted information FM signal;

The touch screen calculates a nib position of the active pen according to the demodulation amplitude.
The signal analysis method according to claim 4, wherein the number of the preset frequencies is one, and the preset frequency is the demodulation frequency;

The information to be transmitted information includes a first partial signal and a second partial received in sequence number;

The touch screen performs frequency demodulation on the first partial signal to obtain a demodulation frequency of the FM signal to be transmitted.

The touch screen performs amplitude demodulation on the second partial signal according to the demodulation frequency to obtain a demodulation amplitude of the information to be transmitted information.
The signal analysis method according to claim 4, wherein the number of the preset frequencies is one, and the preset frequency is a center frequency of a demodulation band of the touch screen.
The signal analysis method according to claim 4, wherein the number of the preset frequencies is plural, and the plurality of preset frequencies belong to a demodulation frequency band of the touch screen, and one of the preset frequencies is The center frequency of the demodulation band.
An active pen, characterized by being applied to the signal transmitting method according to any one of claims 1 to 3; the active pen includes:

a frequency modulation module, configured to frequency-modulate the information to be transmitted to generate an information-modulated signal to be transmitted;

And a signal transmitting module, configured to transmit the information to be transmitted to the FM signal.
A touch screen, comprising:

a signal receiving module, configured to receive an information modulation signal to be transmitted transmitted by the active pen according to the signal transmitting method according to any one of claims 1 to 3;

a frequency demodulation module is connected to the signal receiving module; the frequency demodulation module is configured to perform frequency demodulation on the information to be transmitted information to obtain a demodulation frequency of the information to be transmitted;

An information acquisition module is connected to the frequency demodulation module; the information acquisition module is configured to acquire information to be transmitted corresponding to the demodulation frequency according to a preset correspondence between a demodulation frequency and information to be transmitted;

An amplitude demodulation module is connected to the signal receiving module; the amplitude demodulation module is configured to perform amplitude demodulation on the to-be-transmitted information FM signal according to at least one preset frequency to obtain the FM signal to be transmitted. Demodulation amplitude

a position calculation module is connected to the amplitude demodulation module; the position calculation module is configured to calculate a nib position of the active pen according to the demodulation amplitude.
The touch screen according to claim 9, wherein the amplitude demodulation module is further connected to the frequency demodulation module; the number of the preset frequencies is one, and the preset frequency is Demodulation frequency

The information to be transmitted information includes a first partial signal and a second partial signal that are sequentially received;

The touch screen performs frequency demodulation on the first partial signal to obtain a demodulation frequency of the FM signal to be transmitted.

The touch screen performs amplitude demodulation on the second partial signal according to the demodulation frequency to obtain a demodulation amplitude of the information to be transmitted information.
The signal analysis method according to claim 9, wherein the number of the preset frequencies is one, and the preset frequency is a center frequency of a demodulation band of the touch screen.
The signal analysis method according to claim 9, wherein the number of the preset frequencies is plural, and the plurality of preset frequencies belong to a demodulation band of the touch screen, and one of the preset frequencies is The center frequency of the demodulation band.