TWI540472B - Transmitter and transmitting method thereof - Google Patents

Description

Transmitter and its signaling method

The present invention relates to a transmitter suitable for use in a touch panel, and more particularly to a transmitter that can simultaneously transmit a plurality of frequencies.

Touch panels or touch screens are important human-machine interfaces, especially on consumer electronics such as mobile phones, tablets, or personal digital assistants. Touch screens are the most important output and input devices. Since capacitive touch screens, especially in the form of projected capacitors, are particularly sensitive to partial finger sensing, they are one of the major touch panel/screen designs on the market.

Touching a fingertip can block a portion of the screen, and the user cannot clearly confirm with the eyes where the touch screen detects. Moreover, writing with a fingertip may not be precisely controlled like using a pen. Therefore, in addition to the user's desire to touch with a finger, the user may also want to input the touch screen with a pen.

In general, the area of the nib that touches the touch screen is much smaller than the area of the fingertip. For capacitive touch screens, it is a challenge to detect the change in capacitance caused by the pen. Especially in many professional drawing or typesetting applications, many function buttons need to be added to the design of the pen. Under such demand, the touch screen not only detects tiny nibs, but also detects whether these function buttons are pressed.

In summary, the market needs a stylus that supports multiple function input interfaces, so that the touch screen can detect the status of the function buttons while detecting the stylus.

In an embodiment, the present invention provides a transmitter for transmitting an electrical signal to a touch device according to a transmitter status, so that the touch device analyzes the electrical signal to know the status of the transmitter. a relative position of the transmitter and the touch device, wherein the electrical signal is formed by mixing a plurality of frequencies.

In another embodiment, the present invention provides a signaling method suitable for a transmitter, comprising: generating a sender state based on a state within a sensor module included in the transmitter; The transmitter sends an electrical signal to a touch device, so that the touch device analyzes the electrical signal to know the status of the transmitter and a relative position of the transmitter and the touch device. The signal system is a mixture of a plurality of frequencies.

In summary, one of the main spirits of the present invention is to use an electrical signal mixed with a plurality of frequencies so that the touch device can detect the position of the transmitter that emits the electrical signal and the state of the sensor thereon. .

100‧‧‧ sender

110‧‧‧Power Module

120‧‧‧Processing module

130‧‧‧Sensor module

140‧‧‧frequency synthesis module

150‧‧‧Signal amplification module

160‧‧‧Transmission module

210~220‧‧‧Steps

300‧‧‧ touch system

320‧‧‧Touch panel

321‧‧‧first electrode

322‧‧‧second electrode

330‧‧‧Touch processing device

340‧‧‧Host

410‧‧‧ Receiver analog front end

420‧‧‧Demodulation Transducer

510‧‧‧Signal Generator

520I/520Q‧‧‧Mixer

530I/530Q‧‧‧ integrator

540I/540Q‧‧‧ squarer

550‧‧‧ rms square root

600‧‧ amp amplifier

605‧‧‧ Analog Digital Converter

610‧‧‧Signal Generator

620I/620Q‧‧‧Mixer

630I/630Q‧‧‧Addition integrator

640I/640Q‧‧‧ squarer

650‧‧‧ rms square root

700‧‧‧Amplifier

710‧‧‧ Analog Digital Converter

720‧‧‧Fourier converter

905~930‧‧‧Steps

The first figure is a schematic diagram of a transmitter according to an embodiment of the invention.

The second figure is a schematic flowchart of a signaling method according to an embodiment of the invention.

The third figure is a schematic diagram of a touch system according to an embodiment of the invention.

FIG. 4 is a partial block diagram of a touch processing device according to an embodiment of the invention.

The fifth figure is a partial block diagram of an analog demodulator according to an embodiment of the invention.

Figure 6 is a partial block diagram of a digital demodulation transformer in accordance with an embodiment of the present invention.

FIG. 7 is a partial block diagram of a digital demodulation transformer according to an embodiment of the invention.

The eighth figure is a schematic diagram showing the result of demodulation of the digital demodulator according to the seventh figure.

FIG. 9A is a schematic flow chart of a method for sensing a transmitter according to an embodiment of the invention.

FIG. IB is a schematic flow chart of a method for sensing a transmitter according to an embodiment of the invention.

The invention will be described in detail below with some embodiments. However, the scope of the present invention is not limited by the embodiments, except as to the disclosed embodiments, which are subject to the scope of the claims. In order to provide a clearer description and to enable those skilled in the art to understand the present invention, the various parts of the drawings are not drawn according to their relative sizes, and the ratio of certain dimensions or other related scales may be highlighted. It is exaggerated to come out, and the irrelevant details are not completely drawn, in order to simplify the illustration.

In one embodiment, the transmitter referred to in the present invention may be a stylus. In some embodiments, the transmitter can be other items placed on the touch panel or screen. For example, when the touch screen presents the board of the game, the sender can be a piece. After the game program detects the position of the piece on the touch screen, the position of the piece can be known.

Regardless of the contact area of the transmitter with the touch panel, there are several contact points, and the transmitter includes at least one signaling anchor point. The touch panel or the screen can detect the position of the transmitting positioning point as a representative position of the object represented by the sender on the touch panel or the screen. In an embodiment, the transmitter can contact the touch panel, and only needs to send the positioning point to the touch panel, so that the touch panel can detect the sending location.

In an embodiment, the sender may include a plurality of signaling anchors. When touched When the control panel detects the plurality of signaling anchor points, the facing direction of the sender can be detected. In a further embodiment, the sender may include m signaling anchor points, and when the touch panel detects n of the signaling positioning points, the transmitter may be detected to be in touch. The pose on the panel. For example, the sender can be a triangle with four signaling fix points, each of which is placed at the top of the triangle. By detecting the three signaling positioning points on the touch panel, it is possible to detect which side of the triangle is in contact with the touch panel. The sender can be a cube with eight signaling fix points, each of which is placed at the top of the cube. This type of transmitter can be used as a dice.

Please refer to the first figure, which is a schematic diagram of a transmitter 100 according to an embodiment of the invention. The transmitter 100 includes a power module 110, a processing module 120, a sensor module 130, a frequency synthesizing module 140, a signal amplifying module 150, and a signaling module 160. As described above, the appearance of the transmitter 100 can be used as the shape of a stylus. In an embodiment, each of the above modules may be arranged in the interior of the stylus in the order shown in the first figure, and the lower end is used to contact or approach the touch panel. The transmitter 100 can include a master switch for turning the power of the transmitter 100 on and off.

The power module 110 may include circuits related to power supply and control, such as a battery pack, a direct current to direct current voltage conversion circuit, and a power management unit. The above battery pack may be a rechargeable battery or a disposable disposable battery. When the battery pack is a rechargeable battery, the power module 110 may further include a charging circuit for inputting an external power source into the rechargeable battery. In addition, the external power source may be input to the rechargeable battery in a wireless manner, or the battery pack described above may be replaced with a capacitor. In an embodiment, the charging circuit may be included in the power management unit for protecting the overdischarge and overcharge of the rechargeable battery.

The processing module 120 described above is used to control the transmitter 100, which may include a microprocessor. The sensor module 130 described above may include at least one sensor. The sensor can include a sensor such as a pressure sensor of a stylus tip, a button, an accelerometer, an inductometer, a knob, and the like. The state of the sensor can be binary in nature, for example the button can be in a pressed state or a popped state. The state of the accelerometer can be either stationary or in motion. The state of the sensor can also be a discrete value of diversity. For example, the pressure felt by the pressure sensor can be divided into four segments, ten segments, or sixteen segments. The state of the knob can also be divided into four segments, eight segments, sixteen segments, and the like. The state of the sensor can also be an analogous interval. The processing module 120 can detect the state of the sensor in the sensor module 130, thereby generating a transmitter state. For example, when the nib is connected to an elastic member, when the nib is pressed, the elastic member is deformed by pressure. The aforementioned pressure sensor is coupled to the elastic member to detect the pressure experienced by the elastic member. The foregoing elastic member may be a spring, an elastic rubber or a foam, or other structure or material capable of buffering the pressure to move the nib relative to the pen body, which is not limited by the present invention. Furthermore, the aforementioned pressure sensor may comprise a piezoelectric material that is capable of generating an electrical signal due to deformation.

The frequency synthesizing module 140 includes a plurality of frequency generators and a frequency synthesizing module or a mixer. In an embodiment, the plurality of frequency generators described above may comprise a plurality of quartz oscillators. In another embodiment, the complex frequency generator described above can generate a plurality of frequencies using a single frequency source, using a frequency divider, a frequency multiplier, a phase lock circuit, and other suitable circuitry. These frequencies are not mutually resonant waves, and are different from the frequencies emitted by the touch panel for detecting the transmitter 100, and are not mutually resonant waves. Therefore, it is possible to avoid the situation in which the frequencies interfere with each other.

In some embodiments, the range of the plurality of frequencies described above falls on the touch panel Within the range of frequencies that can be detected. For example, the frequency range that a typical touch panel can detect is about 90 kHz to 250 kHz, so the frequency generated by a plurality of frequency generators can fall within this range.

In an embodiment, the processing module 120 may determine that the frequency synthesis module 140 mixes those frequencies in the plurality of frequencies. That is, it is possible to individually control whether a certain frequency is to be added to the mixer, and of course, it is also possible to control the signal strength of the individual frequencies. In another embodiment, the processing module 120 can determine the ratio of the signal strength of each frequency of the frequency synthesis module 140. For example, the ratio of the signal strength of the first frequency to the signal strength of the second frequency can be set to 3:7. It is also possible to set the ratio of the signal strengths of the first frequency, the second frequency, and the third frequency to 24:47:29 or the like. A person skilled in the art can understand that although the frequency synthesis module 140 can be used to generate and mix multiple frequencies, the processing module 120 may also synthesize the frequency according to the state of each sensor of the sensor module 130. Module 140 produces a single frequency that is not mixed with other frequencies.

In an embodiment, the signal strength of a certain frequency may correspond to a pressure sensor of the device in the sensor module 130 at the tip of the pen, or a knob having a plurality of segments. For example, in a drawing software, the pressure sensor of the stylus pen tip indicates the richness of the pen color, and the degree of rotation of the stylus knob indicates the diameter of the brush. Therefore, the signal intensity of the first frequency can be used to represent the pressure of the pressure sensor, and the signal strength of the second frequency can also be used to indicate the degree of rotation of the knob.

In another embodiment, the ratio of the signal strength of a certain frequency to the combined signal strength may be utilized to correspond to the multi-state of a certain sensor. For example, when the ratio of the signal strength of the first frequency to the signal strength of the second frequency is 3:7, it indicates that the state of the sensor is ten segments. The third segment in the middle, if the intensity ratio is changed to 6:4, indicates that the state of the sensor is the sixth segment in the time period. In other words, if there are three frequencies, then the first signal intensity ratio of the first frequency to the second frequency, the second signal strength ratio of the second frequency to the third frequency, and the third frequency to the third frequency of the first frequency may be utilized. The signal strength ratios represent the states of three sensors with multiple states, respectively.

The signal amplifying module 150 is configured to amplify a signal generated by mixing the frequency synthesizing module 140. In one embodiment, the signal amplification described above corresponds to a pressure sensor of the device in the sensor module 130 at the tip of the pen. Assuming that the circuit of the pressure sensor corresponds to a variable gain amplifier (VGA) of the signal amplifying module 150, the circuit of the pressure sensor can directly control the variable gain without passing through the processing module 120. The gain of the amplifier. Therefore, the mixed signal output by the frequency synthesizing module 140 is amplified by the variable gain amplifier and sent to the transmitting module 160.

As previously stated, the signal strength of a frequency in a mixed signal can be utilized to represent the multi-state of a sensor. It is also possible to use the ratio of the signal intensities of the two frequencies in the mixed signal to represent the multivariate state of a sensor. Or the overall signal strength of the mixed signal is used to represent the multi-state of a sensor. At the same time, the signal amplification module 150 can be utilized to amplify the mixed signal for indicating the multi-state of the other sensor. For example, the transmitter 100 includes two sensors having a multi-state state, one being a pressure sensor of the device at the tip of the pen, and the other being a knob of the device at the pen body. The two are used to indicate the color depth and diameter of the stroke. In an embodiment, the intensity of the mixed signal can be used to indicate the magnitude of the pressure experienced by the pressure sensor, and the state of the knob is represented by the ratio of the signal strength of the two frequencies in the mixed signal, or the overall mixed signal is utilized. The signal amplification module 150 amplifies or reduces to a specific intensity to indicate the specificity of the knob status.

In an embodiment of the invention, the signaling module 160 includes a pressure sensor with a device at the tip of the pen. The signaling module 160 can be a set of antennas or a conductor or electrode having a suitable impedance value, or can be referred to as an excitation electrode. The conductor or electrode of the nib is connected to the pressure sensor. When the signaling module 160 signals and touches the touch panel/screen, the signal flows into the sensing electrodes of the touch panel/screen. When the transmitting module 160 is close to but not touched to the touch panel/screen, the sensing electrodes of the touch panel/screen also sense the amount of signal change on the transmitting module 160, thereby enabling the touch panel/screen The sender 100 is detected to be close.

When the frequency synthesizing module 140 can synthesize n kinds of frequencies, the frequency of the signal can be used to modulate 2 ⁿ states. For example, when n is equal to three, eight states can be modulated by the frequency of the signal. Referring to Table 1, it is a representation of the state of the transmitter and the state of each sensor in accordance with an embodiment of the present invention.

In the embodiment shown in Table 1, the sensor module 130 includes three sensings. The device is a pressure sensor of the nib, a first button, and a second button. The states of these three sensors are all binary states, so there are eight transmitter states combined, as shown in Table 1. It will be understood by those skilled in the art that the above-mentioned transmitter state and each sensor state can be arbitrarily changed positions. For example, the first sender state can be reversed with other transmitter states, such as the seventh transmitter state.

Please refer to Table 2, which is a representation of the state of the transmitter and each frequency in accordance with an embodiment of the present invention. As described above, the frequency synthesis module 140 can synthesize three different frequencies. Therefore, each sender state can be mapped to each frequency. As shown in Table 2. It will be understood by those skilled in the art that the above-mentioned transmitter state and each sensor state can be arbitrarily changed positions. For example, the first sender state can be reversed with other transmitter states, such as the eighth transmitter state.

In one embodiment, the transmitter 100 still mixes the frequency and signals when the pressure sensor sensor of the pen tip does not sense the pressure. In another embodiment, when the pressure of the nib When the force sensor sensor does not feel the pressure, the transmitter 100 does not mix the frequency and does not emit a signal. Referring to Table 2, this state is the seventh sender state. In this embodiment, Table 1 can be modified to Table 3.

In the embodiments shown in Tables 1 to 3, the signal emitted by the transmitter 100 utilizes only the synthesis of frequencies as a factor of signal modulation. In the following embodiments, in addition to the synthesis of the frequency, the transmitter 100 may add a ratio of signal strength and/or signal strength of each frequency as a factor of signal modulation.

Please refer to Table 4, which is a representation of the transmitter frequency state and the state of each sensor in accordance with an embodiment of the present invention. Compared with the embodiment shown in Table 1, the state sensed by the pressure sensor is no longer limited to the binary state with/without contact pressure, but to the multi-state of greater than two. Therefore, the left column of Table 4 cannot be called the sender state and can only be called the sender frequency state. The modulation factor of the transmitter state of this embodiment takes into account the signal strength in addition to the frequency state.

Please refer to Table 5, which is a representation of the transmitter state and each frequency and signal strength according to an embodiment of the present invention. Wherein, the signal strength modulation may be a signal strength value of the mixed signal, for example, the number of contact pressure segments of the pressure sensor.

In the embodiment of Table 5, since the number of contact pressure segments of the pressure sensor corresponding to the fifth to eighth transmitter frequency states is zero, the result of the signal strength modulation can also be zero. In other words, no signal is sent. In another embodiment, the signal strength modulation may be a fixed value, and the fixed signal strength may be different from the signal strength corresponding to the number of contact pressure segments of the pressure sensor.

Please refer to the second figure, which is a schematic flowchart of a signaling method according to an embodiment of the invention. The signaling method can be applied to the transmitter 100 shown in the first figure, but is not limited thereto. The method of transmitting includes two steps. In step 210, a transmitter state is generated based on a state within a sensor module included in the transmitter. And in step 220, sending an electrical signal to a touch device according to the state of the transmitter, so that the touch device analyzes the electrical signal to know the state of the transmitter and the sender and the touch device. A relative position, wherein the electrical signal is a mixture of a plurality of frequencies.

In one embodiment, the sensor within the sensor module includes one of the following: a button, a knob, a pressure sensor (or pressure gauge), an accelerometer, or a gyroscope. The pressure sensor can be used to sense the degree of contact pressure between the transmitter and the touch device.

When the sensor module includes a plurality of sensors, the number of possible states of the transmitter state is the sum of the number of possible states of each of the plurality of sensors. Or in another embodiment, the transmitter status is represented as one of any combination of state representations for each of the plurality of sensors. In one embodiment, the state of a sensor within the sensor module is represented as a multiple of two, where n is an integer greater than or equal to zero.

The modulation factor of the above electrical signal includes one or a combination of the following: frequency, and intensity. In an embodiment, the signal strength of the electrical signal corresponds to the sensor mode The state of the sensor with multiple states within the group. In another embodiment, the signal strength of the first frequency and the second frequency mixed by the electrical signal corresponds to a state of the sensor having a multi-state in the sensor module. In a further embodiment, the signal strength of the electrical signal corresponds to a state of the first sensor having a multi-state in the sensor module, wherein the electrical signal is mixed with a first frequency and a first The signal strength ratio of the two frequencies corresponds to the state of the second sensor having a multivariate state in the sensor module.

One of the main spirits of the present invention is to use an electrical signal mixed with a plurality of frequencies so that the touch device can detect the position of the transmitter that emits the electrical signal and the state of the sensor thereon.

Please refer to the third figure, which is a schematic diagram of a touch system 300 according to an embodiment of the invention. The touch system 300 includes at least one transmitter 100, a touch panel 320, a touch processing device 330, and a host 340. In the present embodiment, the transmitter 100 can be applied to the transmitter described in the above embodiments, and is particularly suitable for the embodiments shown in the first and second figures. It is also worth noting that the touch system 300 can include a plurality of transmitters 100. The touch panel 320 is formed on a substrate, and the touch panel 320 can be a touch screen. The invention does not limit the form of the touch panel 320.

In an embodiment, the touch panel 320 includes a plurality of first electrodes 321 and a plurality of second electrodes 322, and a plurality of sensing points are formed at the overlapping portions. The first electrode 321 and the second electrode 322 are respectively connected to the touch processing device 330. In the mutual capacitance detection mode, the first electrode 321 may be referred to as a first conductive strip or a driving electrode, and the second electrode 322 may be referred to as a second conductive strip or a sensing electrode. The touch processing device 330 can use the driving voltage (the voltage of the driving signal) to the first electrodes 321 and measure the signal changes of the second electrodes 322. It is known that the external conductive object approaches or contacts (referred to as the proximity) the touch panel 320. A person skilled in the art can understand that the touch processing device 330 can detect the proximity event and the proximity object by means of mutual capacitance or self-capacitance, and will not be described in detail herein. In addition to the mutual capacitance or self-capacitance detection method, the touch processing device 330 can also detect the electrical signal emitted by the transmitter 100, thereby detecting the relative relationship between the transmitter 100 and the touch panel 320. position. In one embodiment, the signal changes of the first electrode 321 and the second electrode 322 are respectively measured to detect the signal of the transmitter 100, thereby detecting the relative position of the starter 100 and the touch panel 320. Since the signal of the transmitter 100 is different from the frequency of the mutual capacitance or the self-capacitance driving signal, and is not mutually resonant, the touch processing device 330 can separately distinguish the signal and mutual capacitance emitted by the starter 100 or Self-capacitance signal. The present invention will be described in detail in the following paragraphs. In another embodiment, the touch panel 320 can be a surface capacitive touch panel having one electrode at four corners or four sides. The touch processing device 330 measures the signal changes of the four electrodes separately or simultaneously. The relative position of the starter 100 and the touch panel 320 is detected.

Also included in the third figure is a host 340, which may be an operating system such as a central processing unit, or a main processor within an embedded system, or other form of computer. In one embodiment, the touch system 300 can be a tablet computer, and the host computer 340 can be a central processing unit that executes a tablet operating program. For example, the tablet executes an Android operating system, which is an ARM (ARM) processor that executes an Android operating system. The present invention does not limit the form of information transmitted between the host 340 and the touch processing device 330, as long as the transmitted information is related to the proximity event occurring on the touch panel 320.

Please refer to the fourth figure, which is a partial block diagram of a touch processing device 330 according to an embodiment of the invention. As described above, the touch processing device 330 can utilize each other. The principle of capacitance or self-capacitance detects the proximity event, so the part that is detected with capacitance is omitted here. In the embodiment shown in the fourth figure, a receiver analog front end 410 and a demodulation transformer 420 are included.

The receiver analog front end 410 is used to connect the aforementioned first electrode 321 or second electrode 322. In one embodiment, each of the first electrodes 321 and each of the second electrodes 322 are coupled to a receiver analog front end 410. In another embodiment, the plurality of first electrodes 321 are grouped, and the plurality of second electrodes 322 are grouped. Each group of first electrodes 321 corresponds to one receiver analog front end 410, and each group of second electrodes 322 Corresponds to another receiver analogy front end 410. Each receiver analog receives the signals of the first electrode 321 or the second electrode 322 in the group in turn. In another embodiment, a set of first electrodes 321 and a set of second electrodes 322 correspond to a receiver analog front end 410. The receiver analog front end 410 may firstly connect the first electrode 321 in the group of the first electrodes 321 in turn, and then connect the second electrodes 322 in the group of the second electrodes 322 in turn. Conversely, the receiver analog front end 410 may firstly connect the second electrode 322 in the group of the second electrodes 322 in turn, and then connect the first electrodes 321 in the group of the first electrodes 321 in turn. In an embodiment, the touch processing device 330 can include only one receiver analog front end 410. One of ordinary skill in the art will appreciate that the present invention does not limit the configuration of the first electrode 321 or the second electrode 322 to the receiver analog front end 410. In other words, the number of receiver analog front ends 410 included in the touch processing device 330 will be less than or equal to the sum of the first electrode 321 and the second electrode 322.

The receiver analog front end 410 can perform some filtering, amplification, or other analog signal processing. In some embodiments, the receiver analog front end 410 can receive the difference between two adjacent first electrodes 321 or the difference between two adjacent second electrodes 322. In an embodiment, each receiver analog front end 410 can output to a demodulation transformer 420. In another embodiment, each of the N receiver analog front ends 410 can be output to a demodulation transformer 420. In a further embodiment In the meantime, each receiver analog output 410 can be output to N demodulators 420, wherein the above N is a positive integer greater than or equal to one. In some embodiments, the touch processing device 330 can include only one demodulator 420. One of ordinary skill in the art will appreciate that the present invention does not limit the configuration of the receiver analog front end 410 to the demodulation transformer 420.

The demodulator 420 is configured to demodulate and generate an electrical signal emitted by the transmitter 100 for obtaining information and signals of respective frequencies among the signals received by the corresponding first electrode 321 or the second electrode 322. Strength information. For example, the transmitter 100 can emit signals of three frequencies. The demodulator 420 can be used to separately resolve the signal strength of the three frequencies, the ratio of the signal strength for each of the two frequencies or any two, and the overall signal strength. In the present invention, the demodulation transformer 420 can be implemented in an analog or digital manner, which is divided into three embodiments to illustrate.

Please refer to the fifth figure, which is a partial block diagram of an analog demodulator 420 according to an embodiment of the invention. An analog demodulator as shown in the fifth figure can be used to demodulate each frequency. It is also possible to use a plurality of analog demodulators shown in the fifth figure to demodulate multiple frequencies, for example, when the transmitter 100 can emit N kinds of frequencies, the analogy shown by the N fifth figures can be used immediately. Demodulation transformer to demodulate each frequency. Signal generator 510 is used to generate signals of corresponding frequencies.

The analog signal received from the receiver analog front end 410 can be sent to the two mixers 520I and 520Q via an optional amplifier. The mixer 520I receives the cosine signal output by the signal generator 510 and mixes with the analog signal to generate a mixed signal, and the mixer 520Q receives the sinusoidal signal output by the signal generator 510 and mixes with the analog signal to generate Mixed signal. The mixed signals output by the two mixers 520I and 520Q are output to the integrator 530I and 530Q. Next, the integrated signal will be sent by the integrators 530I and 530Q to the squarers 540I and 540Q, respectively. Finally, the outputs of the squarers 540I and 540Q will be summed by the rms 550 of the sum before the root mean square. In this way, the signal strength corresponding to the frequency of the signal generated by the signal generator 510 can be obtained. When the signal strengths of all frequencies are taken, the signal strength ratio for every two or any two frequencies, as well as the total signal strength, can be generated.

Please refer to the sixth figure, which is a partial block diagram of a digital demodulation transformer 420 according to an embodiment of the invention. Compared with the embodiment shown in the fifth figure, the embodiment shown in the sixth figure is performed in a digital manner. Similarly, a digital demodulator as shown in the sixth figure can be used to demodulate each frequency. It is also possible to use a plurality of digital demodulation transformers shown in the sixth figure to demodulate a plurality of frequencies, for example, when the transmitter 100 can emit N kinds of frequencies, the N digits shown in the sixth figure are immediately used. Demodulation transformer to demodulate each frequency. Signal generator 610 is used to generate digital signals of corresponding frequencies.

The analog signal received from the receiver analog front end 410 can be sent to the analog digital converter 605 via the optional amplifier 600. The sampling frequency of the analog to digital converter 605 will correspond to the frequency of the signal emitted by the signal generator 610. In other words, when the analog-to-digital converter 605 performs a sampling in a first phase, the signal generator 610 will send the first phase signal once to the two mixers 620I and 620Q, respectively, and perform sampling at a second phase. The signal generator 610 will send the second phase signal once to the two mixers 620I and 620Q, respectively. The mixer 620I receives the cosine signal output by the signal generator 610 and multiplies the signal of the digital converter 605 to generate a mixed signal, and the mixer 620Q receives the sinusoidal signal output by the signal generator 610 and performs digital conversion. The signals of the 605 are multiplied to produce a mixed signal. For example, the mixer 620I multiplies the first phase signal by the cosine signal of the first phase to generate a mixed signal of the product of the two, the mixer 620Q multiplies the first phase signal by the sinusoidal signal of the first phase to produce a mixed signal of the product of the two. The mixed signals output by the two mixers 620I and 620Q are output to the adder integrators 630I and 630Q, respectively. Next, the addition-completed signal is sent by the adder integrators 630I and 630Q to the squarers 640I and 640Q, respectively. Finally, the outputs of the squarers 640I and 640Q will be summed by the rms 650 of the sum, and then the root mean square. In this way, the signal strength corresponding to the signal frequency generated by the signal generator 610 can be obtained. When the signal strengths of all frequencies are obtained, the ratio of the signal strength for each of the two frequencies, as well as the total signal strength, can be generated. In the sixth figure, the signal sampled by the analog-to-digital converter 605 is a digital signal, and the subsequent signal processing is digital signal processing.

Please refer to the seventh figure, which is a partial block diagram of a digital demodulator 420 according to an embodiment of the invention. The embodiment shown in the seventh figure is performed in a digital manner, and a digital demodulator as shown in the seventh figure can be used to demodulate and change each frequency. The analog signal received from the receiver analog front end 410 can be sent to the analog digital converter 710 via the optional amplifier 700. Then, the output digital signal is sent to the Fourier converter 720, and the signal strength of each frequency in the frequency domain can be demodulated. The above-described Fourier converter may be a digitalized fast Fourier converter.

Please refer to the eighth figure, which is a schematic diagram of the result of demodulation of the digital demodulator 420 according to the seventh figure. The results shown in the eighth figure are only an example, and in addition to the use of a graphical representation, a variety of data structures can be used to store the results of the demodulation. The horizontal axis of the eighth graph is the signal frequency, and the vertical axis is the signal strength. The signal strength corresponding to the N frequencies that may be emitted by the transmitter 100 can be obtained from the calculation result of the Fourier converter 720. In an embodiment, a threshold value can be set for the signal strength. Signal strength greater than the threshold is considered The signal contains its corresponding frequency. After the signal strengths of the respective frequencies are obtained, the signal strength ratio for each of the two frequencies and the total signal strength can be calculated.

Although the embodiments of the three demodulation transformers 420 illustrated in the fifth to seventh embodiments can be implemented in the touch processing device 330 shown in the third embodiment, the present invention is not limited to the touch processing device. All steps of the demodulator 420 must be implemented 330. In some embodiments, certain steps of demodulator 420 may be performed by host 340. It is also worth noting that although embodiments of the digital demodulation 420 can be implemented using specific hardware, one of ordinary skill in the art will appreciate that the digital solution can also be implemented using software or firmware. The various components of the modulator 420. For example, a mixer can be implemented by multiplication, an addition integrator can be implemented by addition, and multiplication and addition are the most common operational instructions of a general processor.

Please refer to FIG. 9A, which is a schematic flowchart of a method for sensing a transmitter according to an embodiment of the invention. In step 910, a total signal strength of the electrical signal received by each of the first electrode and the second electrode is calculated. Step 910 can be implemented using the embodiments shown in the third to seventh figures. Next, in step 920, a relative position of the sender and the touch device is calculated based on the calculated total signal strength. In an embodiment, the position of the transmitter can be considered to correspond to the first electrode and the second electrode having the greatest total signal strength. In another embodiment, the position of the transmitter can be considered to correspond to the centroid of the adjacent first electrode and the adjacent second electrode having the largest total signal strength, the magnitude of which corresponds to the strength of the signal. Finally, in optional step 930, the sender status can be calculated based on the electrical signal information sent by the sender. One of ordinary skill in the art will appreciate that the implementation of step 930 can be pushed back according to the various tables described above.

Please refer to FIG. BB, which is a sensing transmitter according to an embodiment of the invention. A schematic diagram of a process. In step 905, the total signal strength of the electrical signal received by each of the first or second electrodes can be calculated. After the demodulation changes the electrical signal received by the first electrode or the second electrode, the frequency of the signal sent by the transmitter can be known. For example, if the transmitter sends the first frequency and the second frequency without emitting the third frequency, the third frequency can be omitted during the calculation of the total signal strength of the other electrode performed in step 915. Calculation. If the digital demodulator shown in the seventh figure is used, the method shown in FIG. However, if the demodulator described in Figure 5 or Figure 6 is used and the number of demodulators is not sufficient to scan all frequencies at once, this can save some time and computational resources. Moreover, if the electrical signal emitted by the transmitter is not found after the calculation of the first electrode or the second electrode, step 915 may be omitted. Conversely, after the electrical signal sent by the transmitter is found, step 915 can calculate the total signal strength of the electrical signal received by the other electrode based on the received frequency signal strength of the electrical signal. The remaining steps 920 and 930 may be applied to the description of the embodiment of Figure IX.

It is to be noted that, in the flow of the ninth A and ninth B, if the causal relationship or order between the steps is not mentioned, the present invention does not limit the order in which the steps are performed. Additionally, it is mentioned in steps 905, 910, 915 that the total signal strength of the electrical signal received by each of the first and/or second electrodes is calculated. In an embodiment, if only one single transmitter 100 is included in the touch system 300, the processes of the ninth A and ninth B diagrams may be modified to calculate at least one first electrode and the second Step 920 and step 930 may be performed when the total intensity of the electrical signal received by the electrode is greater than a threshold.

In summary, one of the main spirits of the present invention is to detect the signal strength corresponding to multiple frequencies in the signals received by the first electrode and the second electrode, thereby calculating the starting point. A relative position between the signal and the touch device can also be used to retrieve the status of each sensor on the transmitter by pushing back the sender status. In addition, the present invention can also utilize the touch electrodes of the capacitive touch panel, so that the same capacitive touch panel can perform capacitive detection and can also detect the transmitter. In other words, the same capacitive touch panel can be used for finger detection, palm detection, and detection of a transmitter-type stylus.

100‧‧‧ sender

110‧‧‧Power Module

120‧‧‧Processing module

130‧‧‧Sensor module

140‧‧‧frequency synthesis module

150‧‧‧Signal amplification module

160‧‧‧Transmission module

Claims (21)

A transmitter for transmitting an electrical signal to a touch device according to a transmitter status, so that the touch device analyzes the electrical signal to know the status of the transmitter and the transmitter and the touch device A relative position in which the electrical signal is a mixture of a plurality of frequencies. The transmitter of claim 1 includes a processing module and a sensor module, wherein the processing module is configured to generate the transmitter status according to a state in the sensor module. The transmitter of claim 2, wherein the sensor in the sensor module comprises one of: a button; a knob; a pressure sensor; an accelerometer; and a gyroscope. For example, in the transmitter of claim 2, wherein the sensor module includes a plurality of sensors, the state of the state of the transmitter is the sum of the states of each of the plurality of sensors. . A transmitter as claimed in claim 2, wherein the state of one of the plurality of sensors is represented as a multiple n of two, wherein n is an integer greater than or equal to zero. The transmitter of claim 5, wherein when the sensor module comprises a plurality of sensors, the transmitter state is represented as any combination of state representations of each of the plurality of sensors. One. The transmitter of claim 3, wherein the pressure sensor is configured to sense a degree of contact pressure between the transmitter and the touch device, and when the pressure sensor senses contact pressure Corresponding to a first electrical signal, when the pressure sensor does not sense the contact pressure, corresponding to a second electrical signal, the first electrical signal includes a signal of a first frequency and does not include a second frequency a signal, the second electrical signal comprising the signal of the second frequency and not including the signal of the first frequency. A transmitter as claimed in claim 1, wherein the modulation factor of the electrical signal comprises one or a combination of: a frequency; and an intensity. The transmitter of claim 2, wherein the signal strength of the electrical signal corresponds to a state of a sensor having a multi-state in the sensor module. The transmitter of claim 2, wherein the signal strength of the first frequency and the second frequency mixed by the electrical signal corresponds to a state of the sensor having a multi-state state in the sensor module . A transmitter as claimed in claim 2, wherein the signal strength of the electrical signal corresponds to the a state of the first sensor having a plurality of states in the sensor module, wherein a ratio of a signal strength of the first frequency to the second frequency mixed by the electrical signal corresponds to a plurality of components in the sensor module The state of the second sensor of the state. A method for transmitting a transmitter, comprising: generating a sender state according to a state in a sensor module included in the transmitter; and transmitting an electrical signal according to the transmitter state to A touch device is configured to enable the touch device to analyze the electrical signal to obtain a relative position of the transmitter and the transmitter and the touch device, wherein the electrical signal is formed by mixing a plurality of frequencies. The method of claim 12, wherein the sensor in the sensor module comprises one of the following: a button; a knob; a pressure sensor; an accelerometer; and a gyroscope. The method of claim 12, wherein when the sensor module includes a plurality of sensors, the state of the state of the transmitter is the sum of the states of each of the plurality of sensors. . The method of claim 12, wherein the state of a sensor in the sensor module is expressed as a multiple n of two, where n is an integer greater than or equal to zero. The method of claim 15 , wherein when the sensor module includes a plurality of sensors, the transmitter state is represented by any combination of state representations of each of the plurality of sensors. One. The method of claim 13 , wherein the pressure sensor is configured to sense a degree of contact pressure between the transmitter and the touch device, and when the pressure sensor senses contact pressure Corresponding to a first electrical signal, when the pressure sensor does not sense the contact pressure, corresponding to a second electrical signal, the first electrical signal includes a signal of a first frequency and does not include a second frequency a signal, the second electrical signal comprising the signal of the second frequency and not including the signal of the first frequency. The method of claim 12, wherein the modulation factor of the electrical signal comprises one or a combination of: a frequency; and an intensity. The method of claim 12, wherein the signal strength of the electrical signal corresponds to a state of a sensor having a multi-state in the sensor module. For example, in the method of transmitting the patent of claim 12, wherein the electrical signal is mixed with one of the first frequencies The signal strength with a second frequency corresponds to the state of the sensor having a multi-state in the sensor module. The method of claim 12, wherein the signal strength of the electrical signal corresponds to a state of the first sensor having a plurality of states in the sensor module, wherein the electrical signal is mixed The ratio of the signal strength of a frequency to a second frequency corresponds to the state of the second sensor having a multivariate state in the sensor module.