Touch sensor, touch panel, and device

Abstract

This application discloses a touch sensor, a touch panel, and a device, belonging to the field of electronic technology. The touch sensor includes a controller and multiple drive lines. When a first drive line coupled to a first object exists among the multiple drive lines, the controller adjusts the driving state of the first drive line from a first state to a second state, where the first and second states are opposite driving states. Based on the first drive line in the second state and the second drive line in the first state, a first request signal is transmitted to the touch interaction device. The second drive line is the drive line coupled to the touch interaction device. By adjusting the driving state of the first drive line, the degree of cancellation between the signal transmitted on the first drive line and the signal transmitted on the second drive line is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a touch sensor, touch panel, and device. Background Technology

[0002] In the field of electronics, users interact with touch-sensitive devices, such as styluses. During this interaction, the touch-sensitive device and sensor establish a pairing relationship. For example, the touch sensor continuously sends request signals to the touch-sensitive device, and the device establishes or maintains this pairing based on these signals. However, during interaction, users may accidentally touch the device, causing the touch sensor to couple not only to the touch-sensitive device but also to a component that was accidentally touched, such as the user's hand. Therefore, there is a need for a touch sensor that can maintain pairing with the touch-sensitive device even in the presence of accidental touches. Summary of the Invention

[0003] This application provides a touch sensor, touch panel, and device that can mitigate the signal strength reduction caused by request signal shunting. The technical solution is as follows: In a first aspect, embodiments of this application provide a touch sensor, which includes a controller and multiple drive lines; The controller is configured to adjust the driving state of the first driving line from a first state to a second state when there is a first driving line coupled to the first object among the plurality of driving lines. The first object is different from the touch interaction device, and the first state and the second state are opposite driving states. The controller is further configured to transmit a first request signal to the touch interaction device based on a first drive line in the second state and a second drive line in the first state, wherein the second drive line is a drive line coupled to the touch interaction device, and the first request signal is used for pairing between the controller and the touch interaction device.

[0004] In one possible implementation, the first state is an enabled state and the second state is a disabled state.

[0005] In one possible implementation, there are multiple first drive lines, and the controller is configured to adjust the driving state of some of the multiple first drive lines to a disabled state; transmit a first signal to the touch interaction device based on the first drive lines in the enabled state, and transmit a second signal to the touch interaction device based on the second drive lines in the enabled state, wherein the first signal and the second signal are in-phase signals obtained by splitting the uplink beacon sent by the controller, and the first signal and the second signal are used to superimpose to obtain the first request signal.

[0006] In one possible implementation, the first state is a positive phase drive state, and the second state is an anti-phase drive state; Alternatively, the first state may be an inverted driving state, and the second state may be a forward driving state.

[0007] In one possible implementation, the controller is configured to transmit a third signal to the touch interaction device based on a first drive line in a second state, and to transmit a second signal to the touch interaction device based on a second drive line in the first state. The phase of the third signal is opposite to that of the second signal. The second signal and the third signal are obtained by splitting the uplink beacon sent by the controller. The third signal and the second signal are used to superimpose the first request signal.

[0008] In one possible implementation, the controller is further configured to acquire the coupling characteristics of each of the plurality of drive lines; The first drive line and the second drive line are determined from the plurality of drive lines based on the coupling characteristics of each drive line.

[0009] In one possible implementation, the controller is configured to determine the coupling region where the plurality of drive lines are located, determine the coupling characteristics of each drive line within any coupling region, and the drive lines located within the same coupling region have the same coupling characteristics.

[0010] In one possible implementation, the controller is further configured to adjust the driving state of the first drive line from the second state back to the first state when the coupling between the first drive line and the first object is broken.

[0011] In a second aspect, a touch panel is provided, the touch panel including a touch sensor as in the first aspect or any possible implementation of the first aspect.

[0012] Thirdly, a touch device is provided, which includes the touch panel shown in the second aspect and a processor, the processor being used to process touch data generated by the touch panel based on touch.

[0013] The technical solution provided in this application brings at least the following beneficial effects: The coupling of the first driving line to the first object indicates that the first driving line is the driving line for accidental touch of the first object on the touch sensor. The coupling of the second driving line to the touch interaction device indicates that the second driving line is the driving line for normal contact of the first object on the touch sensor. By adjusting the driving state of the first driving line to be opposite to that of the second driving line, the degree of cancellation between the signal transmitted on the first driving line and the signal transmitted on the second driving line is reduced. This results in a higher signal strength for the first request signal transmitted to the touch interaction device. Higher signal strength leads to a larger effective amplitude of the first request signal, a better signal-to-noise ratio, and a more obvious distinction between the effective signal and noise. This makes it easier for the touch interaction device to sample the effective signal to detect the first request signal. Furthermore, since the pairing between the touch interaction device and the touch sensor depends on the detection result of the first request signal, lower detection difficulty reduces the occurrence of pairing failures due to signal detection failures or parsing errors, thereby improving the pairing success rate between the touch interaction device and the touch sensor. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the distribution of a drive line provided in an embodiment of this application; Figure 2 This is a schematic diagram of a pairing process provided in an embodiment of this application; Figure 3 This is a schematic diagram of another pairing process provided in an embodiment of this application; Figure 4 This is a comparative schematic diagram of accidental touch provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a touch sensor provided in an embodiment of this application; Figure 6 This is a schematic diagram of adjusting the first drive line according to an embodiment of this application; Figure 7 This is a schematic diagram of another adjustment of the first drive line provided in an embodiment of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0017] In the field of electronics, a touch panel includes a touch sensor with multiple drive lines configured for touch positioning. See also... Figure 1 The touch sensor shown includes multiple drive lines orthogonally distributed, with some drive lines horizontally and others vertically. The horizontally distributed drive lines are also called TX (Transmit) rails, and the vertically distributed drive lines are called RX (Receive) rails. The horizontally and vertically distributed drive lines intersect, forming mutual capacitance at the intersection. The intersection of the horizontally and vertically distributed drive lines is called a spatial point or intersection point. Figure 1 Black dots are used to represent the intersections of multiple drive lines, with each intersection corresponding to a mutual capacitance. Figure 1 The black dots are intended to indicate the intersections of the drive lines, not to define the shape of the drive lines.

[0018] In some cases, each drive line can also generate a self-capacitance with respect to the system reference. For example, a single drive line may act as an independent conductor, with a potential difference between itself and the system reference, and there may be an insulating medium separating the drive line and the system reference. Therefore, a self-capacitance will form between the single drive line and the system reference. The system reference may be, for example, the ground wire.

[0019] Optionally, the process of achieving touch positioning based on the driving line includes: if a touch occurs at any position of the touch sensor, for example, when a user touches the contact position using a touch interaction device, a capacitive coupling is formed between the touch interaction device and the electrode of the driving line at the contact position. The touch interaction device shunts the current at the intersection point located at the contact position through this capacitive coupling, resulting in a decrease in the capacitance value of the mutual capacitance at the intersection point. Therefore, the touch position can be detected based on the change in the capacitance value of the mutual capacitance at each intersection point.

[0020] For example, the touch sensor also includes a controller for detecting changes in the capacitance of mutual capacitance at various intersection points to detect the touch position. The controller's ability to detect the touch position presupposes a pairing relationship between itself and the touch interaction device. The pairing process involves the controller sending an uplink beacon to the touch interaction device, which includes a clock signal. The touch interaction device synchronizes its clock with the controller based on the clock signal. Furthermore, the touch interaction device and the controller perform a communication protocol handshake based on the uplink beacon to complete the pairing. With the controller and touch interaction device paired, they can perform real-time and normal touch interaction, enabling real-time detection of the touch position.

[0021] In one possible implementation, the uplink beacon sent by the controller is transmitted via a drive line on the touch sensor, and is also transmitted to the touch interactive device via the drive line when the touch interactive device is within the electric field range. The touch interactive device being within the electric field range means that the touch interactive device has entered the area covered by the alternating electric field generated by the drive line, i.e., there is capacitive coupling between the touch interactive device and the drive line.

[0022] See Figure 2 , Figure 2 The waveforms in the diagram represent uplink beacons. The waveform below the touch sensor represents the uplink beacon generated by the controller and is the starting point of the uplink beacon. The uplink beacon is sent from the controller to the touch interaction device via the drive lines. Depending on whether the drive lines include TX and RX drive lines, the uplink beacon can be transmitted only through the TX drive line, only through the RX drive line, or through both TX and RX drive lines.

[0023] Optionally, the process of transmitting via only the TX drive line is similar to that of transmitting via only the RX drive line, both belonging to the process of transmission through self-capacitance. Taking the TX drive line as an example, after the uplink beacon is injected into the TX drive line, it transmits along the horizontally distributed TX drive line, forming an alternating electric field around it. When the touch interaction device approaches, capacitive coupling is formed between the electrodes on the touch interaction device and the TX drive line, and the uplink beacon is received based on this capacitive coupling. Figure 2 The waveform on the left represents the transmission status of the uplink beacon, indicating that the uplink beacon has been successfully loaded onto the TX transmitting antenna and is in the radiating state. Figure 2 The upward arrow indicates the transmission process of the uplink beacon being emitted towards the stylus above via electromagnetic coupling / near-field radiation.

[0024] If the controller transmits data via the TX and RX drive lines, it utilizes mutual capacitance. The transmission process involves the controller transmitting an uplink beacon on the TX drive line, which generates an alternating electric field around the TX drive line. Due to the mutual capacitance between the TX and RX drive lines, when a touch-screen device approaches the intersection point, the electrodes on the touch-screen device simultaneously form capacitive coupling with both the TX and RX drive lines, thereby directly inducing and receiving the uplink beacon signal from the alternating electric field based on the coupling capacitance.

[0025] After receiving an uplink beacon, the touch-interactive device inputs the beacon to an operational amplifier within the device. The operational amplifier amplifies the uplink beacon to a level that the touch-interactive device can process. (See also...) Figure 3 , Figure 3Taking a stylus as an example of a touch-interactive device, the stylus is equipped with an operational amplifier. The operational amplifier has two input terminals. One input terminal is used to receive the uplink beacon, and the other input terminal is grounded through the hand holding the stylus, providing a reference signal of 0V. The operational amplifier amplifies the difference between the uplink beacon and the reference signal. Since the reference signal is 0V, the difference between the uplink beacon and the reference signal is the uplink beacon. Based on the operational amplifier, the input uplink beacon is amplified to a level that the stylus can support processing. Figure 3 In this circuit, the input terminal used to receive the uplink beacon is the positive input terminal, and the input terminal used to receive the reference signal is the negative input terminal.

[0026] However, during the transmission of uplink beacons, accidental touches may occur on the touch sensor. For example, if a user places their other hand (not holding a pen) on the touch sensor, the accidental touch will weaken the signal received by the touch interaction device. The signal received by the touch interaction device refers to the difference between the signal received at the positive input terminal and the signal received at the negative input terminal after being superimposed by the operational amplifier within the touch interaction device. The signal received by the touch interaction device will be referred to as the request signal below.

[0027] The reasons for the reduced request signal include: if the user places their other hand on the touch sensor, the touch sensor will establish a circuit from the other hand and the user's body to the stylus body for the uplink beacon. Therefore, the uplink beacon sent by the controller will be as follows: Figure 4 As shown in (2), the signal is transmitted through two paths, one to the left hand and the other to the stylus tip. The uplink beacon is split into two signals, resulting in the signal transmitted to the stylus tip being weaker than that of the uplink beacon.

[0028] Furthermore, the signal transmitted to the left hand is also relayed back to the stylus body by the user. This signal retransmission effect also cancels out the signal received by the stylus tip. For example, the signal returned to the stylus body is input to another input terminal of the operational amplifier. The negative input terminal no longer receives the reference signal 0V, but instead receives the signal shunted to the left hand. Therefore, the difference between the positive and negative input terminals of the operational amplifier is smaller than the uplink beacon, and the input request signal is smaller than the uplink beacon. The signal amplified based on the input request signal is also smaller.

[0029] Figure 4 (1) illustrates the transmission process of the uplink beacon in the absence of accidental triggering. Figure 4 In (1), the user holds a stylus, the negative input terminal of the operational amplifier is grounded, and the output of the operational amplifier is large. Figure 4In (2), the user holds the stylus with their right hand and places their left hand on the touch sensor. The negative input of the amplifier is the signal retransmitted by the left hand, and the positive input is the signal received by the stylus tip. The operational amplifier subtracts the signal input at the positive input from the signal input at the negative input and amplifies the difference to obtain the output. The output of the operational amplifier is small. Based on Figure 4 It is known that in the event of a mis-touch, the request signal sent by the touch sensor will be diverted, resulting in a decrease in the signal strength of the request signal received by the touch interaction device, signal recognition failure, and thus pairing failure.

[0030] Based on this, embodiments of this application provide a touch sensor for reducing signal attenuation caused by accidental touches. The touch sensor is, for example, a PCAP (Projected Capacitive Touch) sensor. Figure 5 This is a schematic diagram of the structure of a touch sensor provided in an embodiment of this application. The touch sensor includes a controller 01 and multiple drive lines 02. When there is a first drive line coupled to a first object among the multiple drive lines 02, the controller 01 adjusts the driving state of the first drive line from a first state to a second state. The first object is different from the touch interaction device, and the first state and the second state are opposite driving states.

[0031] Among these, touch interaction devices include, for example, styluses, touch gloves, and touch finger sleeves. The first object differs from the touch interaction device, indicating that the first object is an object with which there is a false touch between it and the touch sensor. The first object can be the user currently using the touch sensor, for example... Figure 4 In some cases, accidental touches can occur due to the user's palm or the touch sensor. Other causes include contact with noisy objects, such as conductive objects like metal accessories worn by the user or conductive objects in the environment like keys or headphones. In some situations, components of the touch interaction device itself may also cause accidental touches with the touch sensor. For example, with a stylus pen, the first object to be accidentally touched might be the pen's conductive body or cap.

[0032] In some cases, a connection path exists between the first object and the touch interaction device, so signals transmitted to the first object will be retransmitted to the touch interaction device based on this connection path. Since the processing of the touch sensor is similar across different first objects, the following explanation will use the user as the first object.

[0033] Optionally, the first driving line is directly coupled to the first object, indicating that the first driving line is the driving line 02 that was accidentally triggered by the first object, for example. Figure 4As shown in (2), when the first object uses the touch sensor, it places its left hand on the touch sensor, resulting in coupling capacitance between the palm of the left hand and multiple intersection points below the palm. The first driving line is the driving line located at the intersection point below the palm. The embodiments of this application do not limit the number of the first driving lines; there can be one or more.

[0034] In some cases, a second driving line also exists on the touch sensor. This second driving line is a driving line coupled to the touch interaction device; that is, the second driving line is the driving line for normal interaction, for example... Figure 4 As shown in (2), the stylus tip, which is a touch interaction device, contacts the touch sensor, and a coupling capacitor is formed between the stylus tip and the intersection point under the tip. The second driving line is the driving line where the intersection point under the tip is located. Similar to the description of the first driving line, the second driving line can be one or more. Furthermore, since the first object uses a touch interaction device, the second driving line is a driving line indirectly coupled to the first object, while the first driving line is a driving line directly coupled to the first object. In other words, the first driving line is a driving line indirectly coupled to the touch interaction device, and the second driving line is a driving line directly coupled to the touch interaction device.

[0035] For touch sensors containing coupled drive lines, including first drive lines and second drive lines, the controller 01 also detects the drive lines within the touch sensor to determine if a false touch occurs on a first drive line. The detection process includes: acquiring the coupling characteristics of each drive line 02 among multiple drive lines 02; and determining the first drive line and second drive line from the multiple drive lines 02 based on the coupling characteristics of each drive line 02. The coupling characteristics describe the physical state of the coupling of the drive lines 02, including but not limited to changes in capacitance and coupling shape.

[0036] In some cases, since the coupled object typically forms capacitive coupling with multiple adjacent drive lines 02 on the touch sensor, the area where these multiple adjacent drive lines 02 are located is called the coupling region. The drive lines 02 within the coupling region share the same coupling characteristics; for example, the coupling shape describes the shape of the coupling region. Therefore, drive lines 02 located within the same coupling region have the same coupling shape. Furthermore, the capacitance changes are also the same for each drive line 02 within the same coupling region; the capacitance changes of drive lines 02 located within the same coupling region are also identical. Therefore, in determining the coupling characteristics, the controller 01 first determines the coupling region where the multiple drive lines 02 are located, and then determines the coupling characteristics of each drive line 02 within any given coupling region.

[0037] For example, controller 01 detects each intersection where the capacitance value changes. Based on the distribution of each intersection, controller 01 divides the multiple intersections with changes into multiple coupling regions, wherein the multiple intersections in a coupling region are located consecutively, and so on. Figure 4 As shown in (2), multiple intersections are divided into two regions: region 1, which is contacted by the stylus tip, and region 2, which is contacted by the palm. In addition, one intersection corresponds to two drive lines 02. The two drive lines 02 refer to the drive lines 02 that are orthogonally connected to form the intersection. After the intersection is divided into the coupling region, the drive line 02 corresponding to the intersection is the drive line 02 included in the coupling region.

[0038] In some cases, if the first object accidentally touches the touch sensor, it's often at the edge. Continuing with the example of the palm, in daily use, accidental touches usually occur at the edge of the palm, with a low probability of accidental touches occurring across the entire palm. Therefore, in the above embodiment, the multiple intersections where capacitance changes are detected are intersections located at the edge of the first object. The coupling region identified in this way belongs to the edge of the first object, and the process of identifying coupling features based on this coupling region is also called edge detection.

[0039] After dividing the coupling region, controller 01 further determines the coupling characteristics of the coupling region. The coupling characteristics include, but are not limited to, at least one of contact area, capacitance change gradient, or touch shape factor. Among them, contact area refers to the area of ​​the coupling region, which can be determined based on the position of each intersection point included in the coupling region at the touch sensor. Capacitance change gradient reflects the capacitance change at each intersection point in the coupling region. Touch shape factor describes the edge shape of the coupling region.

[0040] Continue with Figure 4 Taking the two coupling regions shown in (2) as examples, the coupling characteristics of each coupling region are explained. Region 1, which contacts the stylus tip, has a small contact area. The capacitance change gradient describes the capacitance change as a sharp signal peak and steep edge attenuation. The edge shape described by the touch shape factor is close to a perfect circle and is regularly symmetrical. Region 2, which contacts the palm, has a large contact area. The capacitance change gradient describes the capacitance change as a gentle signal distribution and a small gradient change. The edge shape described by the touch shape factor is irregular and diffuse at the edges.

[0041] The controller 01 determines the second driving line from multiple driving lines 02 based on the coupling characteristics of different coupling regions, and whether the first driving line exists. Continuing with region 1 and region 2 as examples, based on the coupling characteristics of region 1, region 1 is determined to be the region coupled to the touch interaction device, and the driving line 02 in region 1 is the second driving line. Based on the coupling characteristics of region 2, region 2 is determined to be the region coupled to the first object, and the driving line 02 in region 2 is the first driving line.

[0042] If a first driving line exists among the multiple driving lines 02, the controller 01 will adjust the driving state of the first driving line from the same first state as the second driving line to the opposite second driving line, since the first driving line will weaken the request signal received by the touch interaction device. The opposite first and second states can occur in, but are not limited to, the following two situations.

[0043] Method 1: The first state is the enabled state, and the second state is the disabled state.

[0044] The enabled state indicates that drive line 02 is powered normally and can be scanned, driven, or sampled by controller 01. The disabled state indicates that drive line 02 is turned off and is not used for driving or sampling. After determining the first drive line from multiple drive lines 02, controller 01 will set the first drive line to the disabled state. Optionally, controller 01 can adjust all first drive lines, or controller 01 can adjust only some of the first drive lines.

[0045] The reasons for adjusting some of the first drive lines include: some drive lines 02 belong to both the first and second drive lines. For example, when the palm and stylus are placed horizontally on the touch sensor, the horizontally connected TX drive line that the stylus tip contacts also contacts the palm. In this case, directly shutting down the drive line 02 would also affect the transmission of the stylus tip signal. In some cases, the controller 01 selects the first drive line to be shut down from multiple first drive lines. For example, it selects the drive line 02 that is different from the second drive line among the multiple first drive lines as the first drive line to be shut down.

[0046] Alternatively, when the uplink beacon utilizes both TX and RX drive lines for transmission, and the multiple first drive lines also include TX and RX drive lines, since the first drive lines transmit signals through coupled mutual capacitance, if all first drive lines belonging to the TX drive line are turned off, the first drive lines belonging to the RX drive line will be unable to couple capacitively with the TX drive line, resulting in no signal transmission. Similarly, turning off the first drive lines belonging to the RX drive line will also limit signal transmission. Therefore, when multiple first drive lines include both TX and RX drive lines, only the TX drive lines or only the RX drive lines can be turned off, i.e., some of the first drive lines.

[0047] The adjustment process is similar regardless of whether the first drive line to be adjusted is all or part of the first drive line. For example, if the first drive line is connected in series with a switch, and the controller 01 closes the switch connected to the first drive line, the first drive line will be in an open circuit state due to the switch being open, achieving the effect of shutting down and ceasing operation. The switch can be, for example, a CMOS analog switch or other devices with switching functions.

[0048] For example, if each driver line operates based on registers, these registers include, but are not limited to, the hw (Hardware) register and the frw (Firmware) register. The hw register is a register directly mapped to the physical circuit and is used to configure hardware-level behavior, such as enabling / disabling driver line 02, setting the drive strength and scan frequency of driver line 02, and setting interrupt trigger conditions. The frw register is a set of configuration parameters maintained by the controller firmware and is used to indirectly control hardware-level behavior. This indirect control process involves the firmware synchronizing the values ​​in the frw register to the hw register, thus enabling indirect control based on the hw register.

[0049] In some cases, there is a correspondence between the binary bits of the register and the drive lines 02. Each drive line 02 corresponds to one binary bit in the register, and the value of the binary bit includes a first value and a second value. If the binary bit is the first value, it indicates that the drive line 02 is enabled; if the binary bit is the second value, it indicates that the drive line 02 is disabled. For example, the first value is 0, and the second value is 1. Based on this, the controller 01 can assign the second value to the binary bit corresponding to the first drive line to be disabled, thereby disabling the first drive line.

[0050] Method 2: The first state is the positive phase drive state, and the second state is the negative phase drive state; or, the first state is the negative phase drive state, and the second state is the positive phase drive state.

[0051] In one possible implementation, the positive-phase drive state refers to the state in which the signal maintains its original phase during transmission, that is, the phase of the signal on the input drive line 02 is the same as the phase of the signal on the output drive line 02. The negative-phase drive state refers to the state in which the phase of the signal is reversed during transmission, that is, the phase of the signal on the input drive line 02 is opposite to the phase of the signal on the output drive line 02. The negative-phase drive state is also called the inverted drive state in some cases.

[0052] Since the adjustment process for the first state being either the positive-phase drive state or the negative-phase drive state is similar, the following explanation will use the example of the first state being the positive-phase drive state and the second state being the negative-phase drive state. For example, controller 01 also implements negative-phase drive of the first drive line through registers. In some cases, in addition to configuring the enable / disable function of drive line 02 as shown in Method 1, the registers can also configure the polarity of drive line 02. For example, the registers are designed with a polarity inversion bit for each drive line 02. If the polarity inversion bit is assigned the third value, the drive line outputs according to the original logic, i.e., it is in the positive-phase drive state, and the signal output by the drive line 02 corresponding to the binary bit is in phase with the input signal. If the polarity inversion bit is assigned the fourth value, the drive line 02 outputs according to the reverse logic, i.e., it is in the negative-phase drive state, and the signal output by the drive line 02 corresponding to the binary bit is out of phase with the input signal. The third and fourth values ​​can be any different values ​​set based on experience and the implementation environment; for example, the third value is 0 and the fourth value is 1.

[0053] In some cases, the polarity inversion bit changes the output level logic or signal timing phase of the drive line 02 by controlling the mapping method of the output signal, thereby achieving the effect of phase inversion. Alternatively, the polarity inversion bit uses an XOR gate to achieve phase inversion. The polarity register and drive line 02 are respectively connected to the XOR gate. For example, one input of the XOR gate is a drive line 02, and the signal input at the other end is the value of the polarity inversion bit corresponding to that drive line 02. In this case, if the input is 0, the XOR gate will not invert the signal input to drive line 02; if the input is 1, the XOR gate will invert the signal input to the drive line.

[0054] After adjusting the driving state of the first driving line to the second state, the controller 01 can transmit a first request signal to the touch interaction device based on the first driving line in the second state and the second driving line in the first state. The signal strength of the first request signal is higher than the signal strength of the second request signal. The second request signal is a request signal sent based on the first driving line in the first state and the second driving line in the first state. The second request signal is, for example, as shown in the above embodiment. Figure 4 (2) The request signal before amplification by the operational amplifier. There are multiple situations for the second state and the first state, and the process of transmitting the first request signal by the controller 01 is different in different situations.

[0055] Scenario 1: A first signal is transmitted to the touch interaction device based on the first drive line in the enabled state, and a second signal is transmitted to the touch interaction device based on the second drive line in the enabled state. The first signal and the second signal are in-phase signals obtained by splitting the uplink beacon sent by the controller. The first signal and the second signal are used to superimpose to obtain the first request signal.

[0056] In Method 1, if there are multiple first drive lines, and the controller 01 adjusts the drive state of some of the multiple first drive lines to the disabled state, resulting in another part of the first drive lines participating in signal transmission, in this case, the uplink beacon sent by the controller 01 to the touch interaction device will be split into two signals, namely the first signal transmitted through the first drive line and the second signal transmitted through the second drive line.

[0057] The first signal is transmitted back to the touch interaction device through the first object, and cancels out a portion of the second signal transmitted to the touch interaction device. For example... Figure 6 As shown, the first signal is sent back to one input of the operational amplifier in the stylus, while the second signal is transmitted to the other input of the operational amplifier. Since the first and second signals obtained by the shunt are in phase, the operational amplifier will subtract the first signal from the second signal to obtain the first request signal to be amplified. The signal strength of the first request signal is lower than the signal strength of the second signal. After that, the operational amplifier amplifies the first request signal.

[0058] The larger the contact area between the first object and the touch sensor, the higher the probability of signal retransmission. This means that the first object has more coupled first drive lines, and the first signal transmitted through the first drive lines is much stronger than the second signal transmitted through the second drive lines. In this case, because the controller 01 shuts down some of the first drive lines, the signal strength of the first signal shunted to a smaller number of first drive lines is weaker, while the signal strength of the second signal shunted to the second drive lines is stronger. That is, the first signal in case 1 is weaker than the signal strength of signal 1 shunted to the first drive lines in case 2, and the second signal in case 2 is stronger than the signal strength of signal 2 shunted to the second drive lines in case 3. Subtracting the first signal from the second signal yields the first request signal, and subtracting the first signal from the second signal yields the second request signal. The first request signal, compared to the second request signal, is based on a larger signal minus a smaller signal, and its signal strength is greater than that of the second request signal. By shutting down some of the first drive lines, the weakening effect of signal retransmission on the request signal is reduced.

[0059] In some cases, if the controller 01 shuts down the first drive line, there is no first drive line involved in signal transmission. Therefore, the uplink beacon sent by the controller 01 will not be split into the first signal and the second signal. The process of transmitting the first request signal to the touch interaction device based on the first drive line in the second state and the second drive line in the first state means that the controller 01 sends the uplink beacon to the touch interaction device using the second drive line in the enabled state. The first request signal is the difference between the uplink beacon and the reference signal 0V. This difference is the same as the uplink beacon. Therefore, the first request signal can be understood as the uplink beacon sent by the controller 01.

[0060] By transmitting a first request signal, the touch interaction device achieves pairing between the touch interaction device and the controller 01 based on the received first request signal. The pairing can be establishing a pairing relationship, i.e., the touch interaction device and the controller 01 were not previously paired, or maintaining a pairing relationship, i.e., the touch interaction device and the controller 01 have already been paired.

[0061] Scenario 2: A third signal is transmitted to the touch interaction device based on the first driving line in the second state, and a second signal is transmitted to the touch interaction device based on the second driving line in the first state; wherein, the phase of the third signal is opposite to the phase of the second signal, the second signal and the third signal are obtained by splitting based on the uplink beacon sent by the controller, and the third signal and the second signal are used to superimpose to obtain the first request signal.

[0062] Case 2 corresponds to the signal transmission process under mode 2. The following explanation will continue with the example of the second state being the inverted driving state and the first state being the non-inverted driving state. (See [link to relevant documentation]). Figure 7 , Figure 7 The uplink beacon output by the controller 01 is split into a first signal and a second signal. The first signal is flipped during transmission to become a third signal, while the second signal is not flipped during transmission. Therefore, the first and second signals are in phase, while the second and third signals are out of phase.

[0063] The process of superimposing the third signal and the second signal is, for example, the third signal being transmitted to... Figure 7 The second signal is transmitted to one input terminal of the operational amplifier in the stylus, while the third signal is transmitted to the other input terminal of the operational amplifier. Since the third signal and the second signal are out of phase, the subtraction of the second signal and the third signal is actually the addition of the second signal and the third signal before the inversion, i.e., the first signal. The signal strength of the first request signal obtained by the addition is higher than the signal strength of the second signal, and the operational amplifier amplifies the first request signal.

[0064] In scenario two, the first request signal is the sum of the second and first signals, and the second request signal is the subtraction of the second and first signals. Therefore, the signal strength of the first request signal is greater than the signal strength of the second request signal.

[0065] In one possible implementation, controller 01 will also detect whether the accidental touch has ended, i.e., whether the coupling between the first drive line and the first object has been broken. The detection process is similar to the process of detecting the presence of the first drive line, as described in the relevant description, and will not be repeated here. If the coupling between the first drive line and the first object is broken, controller 01 will adjust the drive state of the first drive line from the second state back to the first state. For example, it can re-enable the first drive line that was turned off in mode one, or cancel the inversion drive of the first drive line in mode two.

[0066] In summary, the coupling between the first driving line and the first object indicates that the first driving line is the driving line for accidental touches of the first object on the touch sensor, while the coupling between the second driving line and the touch interaction device indicates that the second driving line is the driving line for normal contact of the first object on the touch sensor. By adjusting the driving state of the first driving line to be opposite to that of the second driving line, the degree of cancellation between the signal transmitted on the first driving line and the signal transmitted on the second driving line is reduced. This results in a higher signal strength for the first request signal transmitted to the touch interaction device. Higher signal strength leads to a larger effective amplitude of the first request signal, a better signal-to-noise ratio, and a more obvious distinction between the effective signal and noise. This makes it easier for the touch interaction device to sample the effective signal to detect the first request signal. Furthermore, since the pairing between the touch interaction device and the touch sensor depends on the detection result of the first request signal, a lower detection difficulty for the first request signal reduces the occurrence of pairing failures due to signal detection failures or parsing errors, thereby improving the pairing success rate between the touch interaction device and the touch sensor. Furthermore, this application does not limit the way the driving state is adjusted. It can be adjusted from the enabled state to the disabled state, or from the positive driving state to the negative driving state, or from the negative driving state to the positive driving state, which is highly flexible.

[0067] This application provides a touch panel, including... Figure 5 The touch sensor shown.

[0068] This application provides a touch device, which includes a touch panel and a processor. The processor is used to process touch data generated by the touch panel based on touch.

[0069] For example, touch devices include smartphones, tablets, laptops with integrated touchscreens, touchpads, in-vehicle terminals, etc.

[0070] It should be noted that all information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.), and signals involved in this application have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. For example, the first request signals involved in this application were all obtained with full authorization.

[0071] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0072] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A touch sensor, comprising: The touch sensor includes a controller and multiple drive lines; The controller is configured to adjust the driving state of the first driving line from a first state to a second state when there is a first driving line coupled to the first object among the plurality of driving lines. The first object is different from the touch interaction device, and the first state and the second state are opposite driving states. The controller is further configured to transmit a first request signal to the touch interaction device based on a first drive line in the second state and a second drive line in the first state, wherein the second drive line is a drive line coupled to the touch interaction device, and the first request signal is used for pairing between the controller and the touch interaction device.

2. The sensor of claim 1, wherein, The first state is the enabled state, and the second state is the disabled state.

3. The sensor of claim 2, wherein, The first drive line is multiple, and the controller is configured to adjust the drive state of some of the multiple first drive lines to a disabled state; A first signal is transmitted to the touch interaction device based on the first drive line in the enabled state, and a second signal is transmitted to the touch interaction device based on the second drive line in the enabled state. The first signal and the second signal are in-phase signals obtained by splitting the uplink beacon sent by the controller. The first signal and the second signal are used to superimpose to obtain the first request signal.

4. The sensor according to claim 1, characterized in that, The first state is the positive phase drive state, and the second state is the negative phase drive state; Alternatively, the first state may be an inverted driving state, and the second state may be a forward driving state.

5. The sensor according to claim 4, characterized in that, The controller is configured to transmit a third signal to the touch interaction device based on a first drive line in a second state, and to transmit a second signal to the touch interaction device based on a second drive line in a first state. The phase of the third signal is opposite to that of the second signal. The second signal and the third signal are obtained by splitting the uplink beacon sent by the controller. The third signal and the second signal are used to superimpose the first request signal.

6. The sensor according to any one of claims 1-5, characterized in that, The controller is also configured to acquire the coupling characteristics of each of the plurality of drive lines; The first drive line and the second drive line are determined from the plurality of drive lines based on the coupling characteristics of each drive line.

7. The sensor according to claim 6, characterized in that, The controller is configured to determine the coupling region where the plurality of drive lines are located, determine the coupling characteristics of each drive line within any coupling region, and the drive lines located within the same coupling region have the same coupling characteristics.

8. The sensor according to any one of claims 1-5, characterized in that, The controller is also configured to adjust the driving state of the first drive line from the second state back to the first state when the coupling between the first drive line and the first object is broken.

9. A touch panel, characterized in that, The touch panel includes a touch sensor as described in any one of claims 1-8.

10. A touch device, characterized in that, The touch device includes a touch panel as described in claim 9 and a processor, wherein the processor is used to process touch data generated by the touch panel based on touch.

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