Signal measurement method, signal measurement circuit, touch sensor, and electronic device

Abstract

The present disclosure provides a signal measurement method, a signal measurement circuit, a touch sensor, and an electronic device. The signal measurement method includes: obtaining a measurement mode, where the measurement mode includes a plurality of measurement sequences, the plurality of measurement sequences including at least one positive measurement sequence and at least one negative measurement sequence respectively corresponding to the at least one positive measurement sequence; applying a drive signal, executing the plurality of measurement sequences in the measurement mode, and measuring an induction signal generated according to the drive signal; the executing the plurality of measurement sequences in the measurement mode includes: after executing the current measurement sequence among the plurality of measurement sequences except the last measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, performing a reverse operation on the drive signal. This signal measurement method can eliminate or reduce synchronous and asynchronous electrical noise in measurement and improve the accuracy of signal measurement.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to signal measurement methods, signal measurement circuits, touch sensors, and electronic devices. Background Art

[0002] Touch sensors are affected by electrical noise from chargers and neighboring electronic devices. This electrical noise deteriorates the SNR (Signal to Noise Ratio) performance of the touch sensor, which will reduce the accuracy in calculating the touch amplitude and touch position.

[0003] The electrical noise generated by a charger or other electronic devices will be coupled to the sensor electrodes of the touch screen. Since this noise has no phase-locked relationship with any timing signals available to the touch sensor, this electrical noise must be treated as asynchronous noise. However, in an integrated touch screen, there are significant benefits in synchronizing the signals measured by the touch sensor and sent to the display, and the presence of asynchronous noise makes synchronization difficult and also requires additional elimination of asynchronous noise. Summary of the Invention

[0004] Embodiments of the present disclosure achieve noise cancellation during signal measurement by providing a signal measurement method, a signal measurement circuit, a touch sensor, and an electronic device, also reduce the power consumption of the required SNR for implementation due to less time required for sampling and filtering, obtain better performance by transmitting a higher SNR, and reduce the cost of the device due to reduced circuit complexity and chip area occupied by analog circuit elements.

[0005] At least one embodiment of the present disclosure provides a signal measurement method, including: obtaining a measurement mode, where the measurement mode includes a plurality of measurement sequences, the plurality of measurement sequences including at least one positive measurement sequence and at least one negative measurement sequence respectively corresponding to the at least one positive measurement sequence; applying a driving signal, executing the plurality of measurement sequences in the measurement mode, and measuring an induced signal generated according to the driving signal; where each of the at least one positive measurement sequence includes a positive integration operation and a negative integration operation executed in sequence, each of the at least one negative measurement sequence includes a negative integration operation and a positive integration operation executed in sequence, and executing the plurality of measurement sequences in the measurement mode includes: after executing the current measurement sequence among the plurality of measurement sequences except the last measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, performing a reverse operation on the driving signal.

[0006] For example, in the method provided by at least one embodiment of the present disclosure, executing the plurality of measurement sequences includes: executing the plurality of measurement sequences in a preset order.

[0007] For example, in the method provided by at least one embodiment of the present disclosure, performing the current measurement sequence among the multiple measurement sequences includes: performing two integration operations on the induction signal. In response to the current measurement sequence being a positive measurement sequence, the two integration operations include the positive integration operation and the negative integration operation performed in sequence. In response to the current measurement sequence being a negative measurement sequence, the two integration operations include the negative integration operation and the positive integration operation performed in sequence.

[0008] For example, in the method provided by at least one embodiment of the present disclosure, performing each current measurement sequence among the multiple measurement sequences further includes: reversing the drive signal before each integration operation of the two integration operations, so that the polarities of the drive signal before and after each integration operation are opposite, and the polarity of the drive signal after the two integration operations is the same as the polarity when the drive voltage is applied.

[0009] For example, in the method provided by at least one embodiment of the present disclosure, the number of the at least one positive measurement sequence is equal to the number of the at least one negative measurement sequence.

[0010] For example, in the method provided by at least one embodiment of the present disclosure, the positive measurement sequences and the negative measurement sequences in the measurement mode alternate in a number of 2^N, where N is a natural number.

[0011] For example, in the method provided by at least one embodiment of the present disclosure, after reversing the drive signal, directly perform the next measurement sequence.

[0012] For example, in the method provided by at least one embodiment of the present disclosure, there is at least one voltage transition without measurement between two adjacent measurement sequences including a positive measurement sequence and a negative measurement sequence among the multiple measurement sequences.

[0013] For example, the method provided by at least one embodiment of the present disclosure further includes: performing noise cancellation operations on the positive integrations of the corresponding positive measurement sequence and negative measurement sequence, and performing noise cancellation operations on the negative integrations of the corresponding positive measurement sequence and negative measurement sequence to eliminate the noise accompanying the induction signal.

[0014] At least one embodiment of the present disclosure further provides a signal measurement circuit, including: an acquisition module configured to acquire a measurement mode, the measurement mode including a plurality of measurement sequences, the plurality of measurement sequences including at least one positive measurement sequence and at least one negative measurement sequence respectively corresponding to the at least one positive measurement sequence, each of the at least one positive measurement sequences including a positive integration operation and a negative integration operation executed in sequence, and each of the at least one negative measurement sequences including a negative integration operation and a positive integration operation executed in sequence; a signal module configured to apply a driving signal; a measurement module configured to execute the plurality of measurement sequences in the measurement mode and measure an induced signal generated according to the driving signal; and a reverse module configured to, when the measurement module executes the plurality of measurement sequences in the measurement mode, except for the last measurement sequence among the plurality of measurement sequences, after executing the current measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, perform a reverse operation on the driving signal.

[0015] For example, in the signal measurement circuit provided by at least one embodiment of the present disclosure, the measurement module is configured to execute the plurality of measurement sequences in a preset order.

[0016] For example, the signal measurement circuit provided by at least one embodiment of the present disclosure further includes: an integration module configured to perform two integration operations on the induced signal. In response to the current measurement sequence being a positive measurement sequence, the two integration operations include the positive integration operation and the negative integration operation executed in sequence. In response to the current measurement sequence being a negative measurement sequence, the two integration operations include the negative integration operation and the positive integration operation executed in sequence.

[0017] For example, in the signal measurement circuit provided by at least one embodiment of the present disclosure, the reverse module is further configured to: perform a reverse operation on the driving signal before each integration operation of the two integration operations, so that the polarities of the driving signals before and after each integration operation are opposite and the polarity of the driving signal after the two integration operations is the same as the polarity when the driving voltage is applied.

[0018] For example, in the signal measurement circuit provided by at least one embodiment of the present disclosure, the number of the at least one positive measurement sequence is equal to the number of the at least one negative measurement sequence.

[0019] For example, in the signal measurement circuit provided by at least one embodiment of the present disclosure, the positive measurement sequences and the negative measurement sequences in the measurement mode alternate in a number of 2^N, where N is a natural number.

[0020] For example, in the signal measurement circuit provided by at least one embodiment of the present disclosure, after performing a reverse operation on the driving signal, directly execute the next measurement sequence.

[0021] For example, in the signal measurement circuit provided by at least one embodiment of the present disclosure, there is at least one voltage transition where no measurement is performed between two adjacent measurement sequences including a positive measurement sequence and a negative measurement sequence among the multiple measurement sequences.

[0022] For example, the signal measurement circuit provided by at least one embodiment of the present disclosure further includes: an operation module configured to perform noise cancellation operations on the positive integrals of the corresponding positive measurement sequence and negative measurement sequence, and perform noise cancellation operations on the negative integrals of the corresponding positive measurement sequence and negative measurement sequence to eliminate the noise accompanying the induction signal.

[0023] At least one embodiment of the present disclosure further provides a touch sensor, including: a touch detection circuit; and the signal measurement circuit as described in any one of the above embodiments, wherein the touch detection circuit receives a driving signal and outputs an induction signal, and the signal measurement circuit is coupled to the touch detection circuit.

[0024] For example, in the touch sensor provided by at least one embodiment of the present disclosure, the touch detection circuit includes a driving touch electrode and a sensing touch electrode, wherein the driving touch electrode and the sensing touch electrode are coupled, the driving touch electrode receives a driving signal, and the sensing touch electrode is coupled to output an induction signal.

[0025] At least one embodiment of the present disclosure further provides an electronic device, including the touch sensor as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0027] Figure 1 It is a schematic diagram of a touch sensor;

[0028] Figure 2A It is a schematic diagram of a positive measurement sequence provided by some embodiments of the present disclosure;

[0029] Figure 2B It is a schematic diagram of a negative measurement sequence provided by some embodiments of the present disclosure;

[0030] Figure 2C It is a schematic diagram of a positive measurement sequence and a negative measurement sequence provided by some embodiments of the present disclosure;

[0031] Figure 3 It is a schematic diagram of using different measurement sequences in asynchronous noise provided by some embodiments of the present disclosure;

[0032] Figure 4 Flowchart of a signal measurement method provided by some embodiments of the present disclosure;

[0033] Figure 5A Schematic diagram of the relationship between a measurement mode and the frequency response of noise provided by some embodiments of the present disclosure;

[0034] Figure 5B Another schematic diagram of the relationship between a measurement mode and the frequency response of noise provided by some embodiments of the present disclosure;

[0035] Figure 5C Another schematic diagram of the relationship between a measurement mode and the frequency response of noise provided by some embodiments of the present disclosure;

[0036] Figure 6 Block diagram of a signal measurement circuit provided by some embodiments of the present disclosure;

[0037] Figure 7 A signal measurement method according to some embodiments of the present disclosure based on Figure 5B Schematic diagram of the measurement mode in;

[0038] Figure 8 Block diagram of a touch sensor provided by some embodiments of the present disclosure;

[0039] Figure 9 Block diagram of an electronic device provided by some embodiments of the present disclosure. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0041] Unless otherwise defined, technical terms or scientific terms used in this disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar terms used in this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a", "an" or "the" do not denote a limitation of quantity, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0042] A touch sensor may be disposed on a display to obtain a touch display. For example, it may be a capacitive type, including self-capacitive type and mutual-capacitive type. The touch sensor is usually used in conjunction with a touch controller and a touch processor. Among them, the touch controller sends signals to the touch sensor, and the touch processor interprets the sensing results of the touch sensor. Usually, the touch controller and the touch processor are represented by a single term, such as a touch controller or a touch processor. Unless otherwise specified, it should be understood that the touch sensor in this disclosure includes a touch processor and / or a touch controller or any component that implements its functions.

[0043] Figure 1 is a schematic diagram of a touch sensor. As Figure 1 shown, the touch sensor 10 includes a plurality of first touch electrodes 11 and a plurality of second touch electrodes 12; the plurality of first touch electrodes 11 are, for example, strip-shaped and arranged in parallel and insulated from each other; the plurality of second touch electrodes 12 are, for example, strip-shaped and arranged in parallel and insulated from each other. The plurality of first touch electrodes 11 and the plurality of second touch electrodes 12 may be arranged on different layers and overlap each other (relative to the same reference plane); for example, the plurality of first touch electrodes 11 are disposed above the plurality of second touch electrodes 12. The plurality of first touch electrodes 11 are insulated from the plurality of second touch electrodes 12. For example, the plurality of first touch electrodes extend in the row direction, the plurality of second touch electrodes extend in the column direction, and the orthographic projections of the plurality of first touch electrodes 11 and the plurality of second touch electrodes 12 in a direction perpendicular to the plurality of first touch electrodes 11 cross each other. Figure 1 The input signal shown in is a periodic square wave signal, and this square wave signal is input to the plurality of first touch electrodes 11. Figure 1 The square wave signal in is only a schematic representation of the input signal and is not a limitation on the embodiments of this disclosure.

[0044] Figure 1 The touch sensor shown can be a mutual capacitance type or a self - capacitance type according to the driving method.

[0045] For example, in the case of the mutual capacitance type, the first touch electrode and the second touch electrode are respectively the driving touch electrode and the sensing touch electrode, and the intersection of the driving touch electrode and the sensing touch electrode is the touch point, and the overlapping part of the driving touch electrode and the sensing touch electrode forms a detection capacitance. When there is a touch, the capacitance value of the detection capacitance corresponding to the touched touch point changes, and the sensing result can be obtained by detecting the change in the capacitance value. As Figure 1 shown, during sensing, multiple driving signals (taking a periodic square wave signal as an example in the figure) are respectively input into the driving touch electrode, the sensing touch electrode induces and outputs sensing signals, and the sensing result is obtained from the multiple output signals output from the sensing touch electrode. By calculating the sensing result, it is determined which detection capacitance values have changed, and thus the position of the touch point where the touch occurs can be determined.

[0046] For example, in the case of the self - capacitance type, the first touch electrode itself serves as both the driving touch electrode and the sensing touch electrode. The first touch electrode and a finger or a stylus performing a touch operation, etc. form a detection capacitance, and this detection capacitance changes with the touch operation. Similarly, the second touch electrode itself also serves as both the driving touch electrode and the sensing touch electrode, and the second touch electrode and a finger or a stylus performing a touch operation, etc. also form a detection capacitance, and this detection capacitance also changes with the touch operation. During sensing, first, multiple driving signals are respectively input into the first touch electrode, and the sensing result is obtained from the multiple output signals fed back from the first touch electrode. By calculating the sensing result, it is determined which detection capacitance values have changed, and thus the position of the touch point where the touch occurs in the first direction (the direction in which multiple first touch electrodes are arranged side by side) can be determined; then, multiple driving signals are respectively input into the second touch electrode, and the sensing result is obtained from the multiple output signals fed back from the second touch electrode. By calculating the sensing result, it is determined which detection capacitance values have changed, and thus the position of the touch point where the touch occurs in the second direction (the direction in which multiple second touch electrodes are arranged side by side) can be determined; finally, by combining the positions of the touch point in the first direction and the second direction, the position of the touch point on the entire touch surface is determined.

[0047] Since the touch sensor is usually used to form a touch display device and is used in electronic devices such as mobile phones and tablets, etc., the touch sensor is easily interfered by the electrical noise brought by the internal electronic components of the electronic device or other external electronic devices. This kind of noise interference has a serious impact on the measurement of the touch point position. In addition to causing inaccurate measurement, the reduction of SNR will also make the performance of the electronic device deteriorate.

[0048] Embodiments of the present disclosure provide a signal measurement method and a signal measurement circuit to achieve noise cancellation during signal measurement. When used, for example, in a touch sensor and an electronic device including the touch sensor, in addition to improving the accuracy of signal measurement and eliminating or reducing the influence of noise on calculating the touch amplitude and touch position, the power consumption for achieving the required SNR is also reduced due to less time required for sampling and filtering, better performance is obtained by transmitting a higher SNR, and the cost of the device is reduced due to the reduced complexity of the circuit and the chip area occupied by analog circuit components.

[0049] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that the same reference numerals in different drawings will be used to refer to the same elements that have been described.

[0050] Figure 2A Schematic diagram of a positive measurement sequence provided for some embodiments of the present disclosure.

[0051] In Figure 2A the regular signal similar to a square wave is the drive signal, and the irregular signal is the noise signal. Attributes of the drive signal include, for example, drive voltage, drive level, etc. Attributes of the noise signal include, for example, noise voltage, noise level, etc. In Figure 2A the drive signal includes 2 voltage transitions. Specifically, a voltage transition from a low level to a high level and a voltage transition from a high level to a low level. Figure 2A the positive measurement sequence in Figure 2A includes a positive integration and a negative integration, where the positive integration occurs along with the voltage transition from a low level to a high level, and the negative integration occurs along with the voltage transition from a high level to a low level. It should be noted that the positive integration in the present disclosure can also be referred to as positive measurement, and the negative integration can also be referred to as negative measurement. For the convenience of distinguishing the measurement sequence from the measurement, "integration" is used in this article for description. Continuing to refer to

[0052] Figure 2B Schematic diagram of a negative measurement sequence provided for some embodiments of the present disclosure.

[0053] Corresponding to Figure 2A the negative measurement sequence includes a negative integration and a positive integration. The negative integration occurs along with the voltage transition from a high level to a low level, and the positive integration occurs along with the voltage transition from a low level to a high level. Different from the positive measurement sequence, the drive signal and the noise signal in the negative measurement sequence are "in-phase".

[0054] It should be noted that "in-phase" or "anti-phase" in the present disclosure does not mean that the phases of the drive signal and the noise signal are exactly the same, but is intended to illustrate that their phases are opposite within a certain range. Similarly, high level and low level are also relative concepts in the present disclosure, and the high level / low level in the positive measurement sequence / negative measurement sequence is not necessarily equal. For example, the high level in the positive measurement sequence is "1" and the low level is "0", while at the same time the high level in the negative measurement sequence is "0" and the low level is "-1".

[0055] Figure 2C Schematic diagrams of the positive measurement sequence and the negative measurement sequence provided for some embodiments of the present disclosure.

[0056] In some embodiments of the present disclosure, sequentially performing a plurality of measurement sequences includes continuously and uninterruptedly performing a plurality of measurement sequences and intermittently performing a plurality of measurement sequences. For example, in Figure 2C a positive measurement sequence and a negative measurement sequence are sequentially performed, and there is a voltage transition without measurement between the positive measurement sequence and the negative measurement sequence. Since the frequencies of the drive signal and the noise signal are different, inserting at least one voltage transition without measurement between multiple measurements or multiple measurement sequences can keep the periodic noise signal in a relatively stable phase relationship with the positive measurement sequence and the negative measurement sequence in the multiple measurement sequences, so that the positive measurement sequence and the negative measurement sequence are always executed at the required positions. For example, Figure 2C the positive measurement sequence is executed at the position where the noise signal and the drive signal are in anti-phase, and the negative measurement sequence corresponding to the positive measurement sequence is executed at the subsequent position where the noise signal and the drive signal are in-phase, so that the measurement results include the positive integral and the negative integral corresponding to both the "in-phase" noise signal and the "anti-phase" noise signal. Thus, after the positive integral and the negative integral are processed (such as summed), they can cancel each other out, thereby achieving noise cancellation. Optionally, the frequency of the drive signal can be changed to insert the voltage transition without measurement.

[0057] Figure 3 Schematic diagrams of using different measurement sequences in asynchronous noise provided for some embodiments of the present disclosure.

[0058] In Figure 3 the noise signal is represented by a line similar to a sine wave. This noise signal belongs to asynchronous noise. The drive signal is not shown in the figure, but it can be understood that the drive signal can be, for example, a signal similar to a square wave. Figure 3 The dark blocks in Figure 3 are positive integrals, and the white blocks are negative integrals. Figure 3In the right waveform, the voltage jumps that are not measured between the fifth integral and the sixth integral are removed. The positive / negative measurement sequence pairs' integrals of noise can cancel each other out, thus eliminating the noise in the final result. For example, Figure 3 The dark blocks in the left waveform of Figure 3 are denoted as positive integral 1, positive integral 2, positive integral 3, positive integral 4, and positive integral 5 from left to right in sequence, while the white blocks are denoted as negative integral 1, negative integral 2, negative integral 3, negative integral 4, and negative integral 5 from left to right in sequence. The amplitude of the first half cycle of the noise signal is assumed to be positive, and the amplitude of the second half cycle is assumed to be negative. The results of the positive integrals (positive integrals 1 - 3) for positive values are positive, the results of the negative integrals (negative integrals 1 - 2) for positive values are negative, the results of the positive integrals (positive integrals 4 and 5) for negative values are negative, and the results of the negative integrals (negative integrals 3 - 5) for negative values are positive. As can be seen from Figure 3 the left waveform of

[0059] positive integral 1 corresponds to negative integral 3, positive integral 2 corresponds to negative integral 4, positive integral 3 corresponds to negative integral 5, negative integral 1 corresponds to positive integral 4, negative integral 2 corresponds to positive integral 5, and positive integrals 1 - 3 and their respectively corresponding negative integrals 3 - 5 are both positive, while negative integrals 1 - 2 and their respectively corresponding positive integrals 4 - 5 are both negative. Thus, Figure 3 the summation results of the final positive and negative integrals in the left waveform of

[0059] cannot eliminate the noise, but instead amplify the noise.

[0059] On the contrary, for example, Figure 3 the dark blocks in the right waveform of Figure 3 are denoted as positive integral 1, positive integral 2, positive integral 3, positive integral 4, positive integral 5, and positive integral 6 from left to right in sequence, while the white blocks are denoted as negative integral 1, negative integral 2, negative integral 3, and negative integral 4 from left to right in sequence. The amplitude of the first half cycle of the noise signal is assumed to be positive, and the amplitude of the second half cycle is assumed to be negative. Similarly, the results of the positive integrals (positive integrals 1 - 3) for positive values are positive, the results of the negative integrals (negative integrals 1 - 2) for positive values are negative, the results of the positive integrals (positive integrals 4 - 6) for negative values are negative, and the results of the negative integrals (negative integrals 3 - 4) for negative values are positive. The difference is that Figure 3 in the right waveform of

[0060] positive integrals 1 - 3 correspond to positive integrals 4 - 6, and negative integrals 1 - 2 correspond to negative integrals 3 - 4. Thus, in the right waveform, the positive integral values and the corresponding negative integral values of the noise signals in the first half cycle and the second half cycle can be added together and cancel each other out, so the noise in the measurement result is eliminated.

[0060] At least one embodiment of the present disclosure provides a signal measurement method, including: obtaining a measurement pattern, where the measurement pattern includes a plurality of measurement sequences, and the plurality of measurement sequences include at least one positive measurement sequence and at least one negative measurement sequence corresponding to each of the at least one positive measurement sequence respectively; applying a driving signal, executing the plurality of measurement sequences in the measurement pattern, and measuring an induced signal generated according to the driving signal. Each of the at least one positive measurement sequence includes a positive integration operation and a negative integration operation executed in sequence, and each of the at least one negative measurement sequence includes a negative integration operation and a positive integration operation executed in sequence. Executing the plurality of measurement sequences in the measurement pattern includes: after executing the current measurement sequence among the plurality of measurement sequences except the last measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, performing a reverse operation on the driving signal.

[0061] Figure 4 The flowchart of a signal measurement method provided by some embodiments of the present disclosure. As Figure 4 shown, in some embodiments, the signal measurement method includes:

[0062] Step S100: Obtain a measurement pattern, where the measurement pattern includes a plurality of measurement sequences, and the plurality of measurement sequences include at least one positive measurement sequence and at least one negative measurement sequence corresponding to each of the at least one positive measurement sequence respectively;

[0063] Step S102: Apply a driving signal, execute the plurality of measurement sequences in the measurement pattern, and measure an induced signal generated according to the driving signal.

[0064] Here, each of the at least one positive measurement sequence includes a positive integration operation and a negative integration operation executed in sequence, and each of the at least one negative measurement sequence includes a negative integration operation and a positive integration operation executed in sequence. Moreover, executing the plurality of measurement sequences in the measurement pattern includes: after executing the current measurement sequence among the plurality of measurement sequences except the last measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, performing a reverse operation on the driving signal.

[0065] When executing step S100, the measurement pattern may include at least two measurement sequences, that is, at least one positive measurement sequence and one negative measurement sequence. The number of measurement sequences in the measurement pattern can be set according to actual applications, such as 2, 4, 6, 8, etc. The measurement pattern can be pre-stored in, for example, a register, so as to access the register each time to obtain the current measurement sequence to be performed. Optionally, the register is a shift register.

[0066] Optionally, the number of at least one positive measurement sequence is equal to the number of at least one negative measurement sequence. For example, if there are 4 positive measurement sequences in the measurement pattern, then there are also 4 negative measurement sequences in the measurement pattern.

[0067] Optionally, the positive measurement sequence and the negative measurement sequence in the measurement mode alternate in number of 2^N, where N is a natural number. For example, when the measurement mode includes 8 measurement sequences, the measurement mode sequentially includes 4 positive measurement sequences and 4 negative measurement sequences; or, the measurement mode sequentially includes 2 positive measurement sequences, 2 negative measurement sequences, 2 positive measurement sequences, and 2 negative measurement sequences; or, in the measurement mode, 1 positive measurement sequence and 1 negative measurement sequence are repeated 4 times. For example, the measurement mode may also include 4 negative measurement sequences and 4 positive measurement sequences in sequence, etc.

[0068] In the embodiments of the present disclosure, the measurement mode with the positive measurement sequence first is taken as an example for description, but the embodiments of the present disclosure are not limited thereto, and the same applies to the measurement mode with the negative measurement sequence first.

[0069] When performing step S102, a driving signal is applied and multiple measurement sequences in the measurement mode are executed. For example, if the measurement mode includes 4 positive measurement sequences and 4 negative measurement sequences, then these 4 positive measurement sequences and 4 negative measurement sequences are executed.

[0070] Optionally, for example, when performing step S102, a driving signal is applied and multiple measurement sequences are executed in a preset order. For example, the preset order is the order in which multiple measurement sequences are stored in the measurement mode, the acquisition order of obtaining multiple measurement sequences in the measurement mode, or the execution order of executing multiple measurement sequences. For example, the multiple measurement sequences in the measurement mode are sequentially executed in the forward order or sequentially executed in the reverse order. For example, when 8 measurement sequences are executed according to the measurement mode in which 4 positive measurement sequences and 4 negative measurement sequences are sequentially stored, they can be executed in the order of "12345678", "15263748", "12563478", etc. Another example is that when 8 measurement sequences are executed according to the measurement mode in which 1 positive measurement sequence and 1 negative measurement sequence are stored, they can be executed in the order of "11221122", "11112222", etc. Among them, obtaining multiple measurement sequences in the measurement mode in a preset order is similar to executing multiple measurement sequences in a preset order. The difference is that obtaining multiple measurement sequences in a preset order is to obtain multiple measurement sequences separately multiple times in a preset order, while executing in a preset order can be to execute multiple measurement sequences according to the preset order after obtaining the complete measurement mode.

[0071] In embodiments of the present disclosure, the measured signal is not a driving signal, but an induced signal generated according to the driving signal. For the manner of generating the induced signal, reference may be made to the description of the touch sensor above, which will not be elaborated here. Embodiments of the present disclosure place no limitation on the specific form of the driving signal. For example, the driving signal may be a periodic square wave signal or other applicable signals, such as a triangular wave signal, a sine wave signal, etc. For example, the measurement mode includes 8 measurement sequences. Except for the 8th measurement sequence, after each of the first 7 measurement sequences is completed, it is necessary to determine whether the next measurement sequence has the opposite polarity to the current measurement sequence. For example, if the 6th measurement sequence is a negative measurement sequence and the 7th measurement sequence is a positive measurement sequence, then after the 6th measurement sequence is completed, it is necessary to reverse the driving signal. Since there is at least one non-measured voltage transition between the 6th measurement sequence and the 7th measurement sequence, the reverse operation can be completed using the transition time of this voltage transition.

[0072] Optionally, in response to the polarities of the current measurement sequence and the next measurement sequence being the same, no reverse operation is performed on the driving signal.

[0073] Optionally, performing the current measurement sequence among multiple measurement sequences includes: performing two integration operations on the induced signal. In response to the current measurement sequence being a positive measurement sequence, the two integration operations include a positive integration operation and a negative integration operation performed in sequence; in response to the current measurement sequence being a negative measurement sequence, the two integration operations include a negative integration operation and a positive integration operation performed in sequence.

[0074] Optionally, performing each current measurement sequence among multiple measurement sequences further includes: reversing the driving signal before each of the two integration operations, so that the polarities of the driving signals before and after each integration operation are opposite, and the polarity of the driving signal after the two integration operations is the same as the polarity when the driving voltage is applied. For example, the input driving signal is denoted as "positive". Before the first integration operation, the first reverse operation is performed on the driving signal, so that the driving signal during the first integration operation is "negative". After the first integration operation is completed, the second reverse operation is performed on the driving signal, so that the driving signal during the second integration operation is "positive". Thus, after every two integration operations (whether the positive integration operation or the negative integration operation is performed first), the driving signal can always return to "positive".

[0075] In some embodiments, after the reverse operation is performed on the driving signal, the next measurement sequence is directly executed. It should be noted that in this embodiment, the reverse operation on the driving signal refers to the operation performed in response to the next measurement sequence having the opposite polarity to the current measurement sequence, rather than the reverse operations required for the two integration operations in a measurement sequence.

[0076] In some embodiments, there is at least one voltage transition where no measurement is performed between two adjacent measurement sequences including a positive measurement sequence and a negative measurement sequence in a plurality of measurement sequences. For example, at least an odd number of voltage transitions where no measurement is performed. For example, there is 1 voltage transition where no measurement is performed between two negative measurement sequences, or there are 3 voltage transitions where no measurement is performed between a negative measurement sequence and a positive measurement sequence, etc.

[0077] In some embodiments, after step S102 is executed, the following operations can be continued: performing noise cancellation operations on the positive integrals of the corresponding positive measurement sequence and negative measurement sequence, and performing noise cancellation operations on the negative integrals of the corresponding positive measurement sequence and negative measurement sequence to eliminate the noise accompanying the induction signal. For example, adding or subtracting the results of the corresponding positive measurement sequence and negative measurement sequence.

[0078] Figures 5A - 5C Schematic diagrams showing the relationships between different measurement modes provided by some embodiments of the present disclosure and the frequency responses of noise.

[0079] As Figures 5A - 5C shown, Figures 5A - 5C in it, "positive" represents the positive measurement sequence and "negative" represents the negative measurement sequence. It has different frequency responses under different measurement modes. Without changing the sampling frequency (i.e., the frequency of the measurement sequence), according to this frequency response, the existing noise spectrum or the rejected noise spectrum can be adjusted only by changing the sequence of voltage transitions for measurement or voltage transitions without measurement in the drive signal. Thus, noise cancellation or reduction can be preliminarily achieved itself. Combining with the methods described in the above embodiments can further improve noise cancellation and increase the signal-to-noise ratio.

[0080] The measurement in the embodiments of the present disclosure involves driving the inductive touch electrode lines between two or more voltages and measuring the charge coupled to other inductive touch electrode lines. This measurement operation is usually performed at known time intervals, and the charges coupled to other inductive touch electrode lines are combined to obtain a measurement result.

[0081] The above measurement operation is related to the frequency response as shown in Figures 5A - 5C for example, and this frequency response can attenuate some asynchronous noise frequencies more than other asynchronous noise frequencies. This frequency response can be obtained by adjusting or discarding some charges coupled to some voltage transitions. For example, a low-impedance path from the inductive touch electrode line to a known voltage level can be realized for a short time, so that the charge flows out from the voltage transition, and thus the charge originally coupled to this voltage transition can be discarded.

[0082] Optionally, a filter can also be additionally set according to the frequency response to attenuate noise at specific frequencies, thereby better performing noise cancellation.

[0083] Some embodiments of the present disclosure also provide a signal measurement circuit, which can achieve noise cancellation during signal measurement. When used in a touch sensor, in addition to improving the accuracy of signal measurement and eliminating or reducing the influence of noise on calculating the touch amplitude and touch position, it also reduces the power consumption required to achieve the required SNR due to less time required for sampling and filtering, obtains better performance by transmitting a higher SNR, and reduces the cost of the device due to reducing the complexity of the circuit and the chip area occupied by analog circuit components.

[0084] Figure 6 It is a block diagram of a signal measurement circuit 60 provided by some embodiments of the present disclosure.

[0085] As Figure 6 shown, the signal measurement circuit 60 includes an acquisition module 61, a signal module 62, a measurement module 63, and a reverse module 64. The acquisition module 61 is coupled to the measurement module 63, the signal module 62 is coupled to the reverse module 64 and the measurement module 63, and the reverse module 64 is also coupled to the measurement module 63. For example, the signal measurement circuit 60 can be implemented as a digital signal processor (DSP), a single-chip microcomputer, etc. Also, the acquisition module 61, the signal module 62, the measurement module 63, and the reverse module 64 can be implemented using hardware, hardware combined with software, or hardware combined with firmware. For example, the reverse module 64 can be implemented as an inverter. For example, each module in the signal measurement circuit 60 can be implemented as an integrated circuit IC, an application-specific integrated circuit ASIC, a very large scale integrated circuit VSLI, a field programmable gate array FPGA, etc.

[0086] The acquisition module 61 is configured to acquire a measurement mode. As described above, the measurement mode includes multiple measurement sequences, the multiple measurement sequences include at least one positive measurement sequence and at least one negative measurement sequence respectively corresponding to the at least one positive measurement sequence. Each of the at least one positive measurement sequences includes a positive integration operation and a negative integration operation executed in sequence, and each of the at least one negative measurement sequences includes a negative integration operation and a positive integration operation executed in sequence.

[0087] The signal module 62 is configured to apply a drive signal.

[0088] The measurement module 63 is configured to execute multiple measurement sequences in the measurement mode and measure the induced signal generated according to the drive signal.

[0089] The reverse module 64 is configured to, when the measurement module executes multiple measurement sequences in the measurement mode, perform a reverse operation on the drive signal in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence after the current measurement sequence is executed in all measurement sequences except the last measurement sequence.

[0090] In some embodiments, the signal measurement circuit 60 may further include an integration module configured to perform two integration operations on the induced signal. In response to the current measurement sequence being a positive measurement sequence, the two integration operations include a positive integration operation and a negative integration operation performed in sequence. In response to the current measurement sequence being a negative measurement sequence, the two integration operations include a negative integration operation and a positive integration operation performed in sequence.

[0091] In some embodiments, the reverse module 64 is further configured to: perform a reverse operation on the drive signal before each integration operation of the two integration operations, so that the polarities of the drive signals before and after each integration operation are opposite, and the polarity of the drive signal after the two integration operations is the same as the polarity when the drive voltage is applied.

[0092] In some embodiments, the signal measurement circuit may further include an arithmetic module configured to perform noise cancellation operations on the positive integrations of both the corresponding positive measurement sequence and negative measurement sequence, and perform noise cancellation operations on the negative integrations of both the corresponding positive measurement sequence and negative measurement sequence to eliminate the noise accompanying the induced signal.

[0093] In this embodiment, the signal measurement circuit 60 may execute the method described in the above method embodiment. For specific details, reference may be made to the above method embodiment and will not be elaborated here.

[0094] Figure 7 Displays a schematic diagram of a signal measurement method executed according to the measurement mode as Figure 5B shown.

[0095] Taking the signal measurement circuit 60 to execute Figure 7Taking the measurement method in as an example, the signal module 62 applies a driving signal. Currently, it is the first execution of the measurement sequence and the first measurement sequence is a positive measurement sequence. Thus, the reverse module 64 reverses the driving signal, the measurement module 63 performs a positive integration operation on the reversed driving signal, then the reverse module 64 reverses the driving signal again, and the measurement module 63 performs a negative integration operation on the driving signal reversed twice. Then it is determined that the polarity of the second measurement sequence is the same as that of the first measurement sequence, both being positive measurement sequences, so the second positive measurement sequence is directly executed. The process of executing the second positive measurement sequence is basically the same as that of executing the first positive measurement sequence, and the only difference is that when judging the polarity of the third measurement sequence and the second measurement sequence, the polarity of the third measurement sequence is different from that of the second measurement sequence. Therefore, after reversing the driving signal, the third measurement sequence is executed. During the execution of the third measurement sequence, the reverse module 64 reverses the driving signal, the measurement module 63 performs a negative integration operation on the reversed driving signal, then the reverse module 64 reverses the driving signal again, and the measurement module 63 performs a positive integration operation on the reversed driving signal. Then it is determined that the polarity of the fourth measurement sequence is the same as that of the third measurement sequence. The execution manners of the fourth to eighth measurement sequences are similar to the first three times and will not be elaborated here.

[0096] Some embodiments of the present disclosure also provide a touch sensor, including: a touch detection circuit; and a signal measurement circuit as described in any one of the above embodiments, wherein the touch detection circuit receives a driving signal and outputs an induction signal, and the signal measurement circuit is coupled to the touch detection circuit.

[0097] Figure 8 It is a block diagram of a touch sensor provided by some embodiments of the present disclosure.

[0098] In Figure 8 , the touch sensor 80 includes a touch detection circuit 81 and a signal measurement circuit 82. Among them, the signal measurement circuit 82 can be the signal measurement circuit 60 as shown in Figure 6 . The touch detection circuit 81 is coupled to the signal measurement circuit 82. The touch detection circuit 81 receives a driving signal and can sense and output an induction signal according to the received driving signal, and the signal measurement circuit 82 applies a driving signal and measures the induction signal.

[0099] For example, the touch detection circuit 81 includes a driving touch electrode and an induction touch electrode. Among them, the driving touch electrode and the induction touch electrode are coupled. The driving touch electrode receives a driving signal, and the induction touch electrode is coupled to output an induction signal. The driving touch electrode and the induction touch electrode can be referred to the description in Figure 1 and will not be elaborated here.

[0100] Figure 9An electronic device provided by some embodiments of the present disclosure. In Figure 9 the electronic device 90 includes a touch sensor 80 as described in the above embodiments.

[0101] For example, the electronic device of the embodiments of the present disclosure may be a touch panel, and the touch panel includes the touch sensor of any of the above embodiments. For example, the touch panel may be a touch display panel with a display function, so that display coupling noise can be effectively eliminated or reduced when detecting touch signals. For example, the touch display panel may be a liquid crystal (LCD) touch display panel, an OLED touch display panel, a quantum dot light emitting diode (QLED) touch display panel, or any other type of panel with touch and display functions, and can be used for desktop computers, laptops, TVs, monitors, navigators, digital photo frames, etc. According to the relationship between the touch sensor and the display panel, the touch display panel may be an out-cell type, an on-cell type, an in-cell type, etc., and the embodiments of the present disclosure do not limit this. For example, in at least one similar case, for example, the signal measurement circuit of the touch sensor may be integrated in the touch display driver of the touch display panel, may also be separately provided in the touch display panel, or may also be set in other applicable ways, and the embodiments of the present disclosure do not limit this.

[0102] For example, the electronic device of the embodiments of the present disclosure may be a touchpad, and the touchpad includes the touch sensor of any of the above embodiments. For example, the touch panel may be used for, for example, a desktop computer or a laptop as an input auxiliary device, etc.

[0103] In addition to the above description, the following points need to be noted:

[0104] (1) The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures may refer to the general design.

[0105] (2) Without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments.

[0106] As described above, the above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A signal measurement method, comprising: obtaining a measurement mode, wherein the measurement mode includes a plurality of measurement sequences, the plurality of measurement sequences includes at least one positive measurement sequence and at least one negative measurement sequence respectively corresponding to the at least one positive measurement sequence, and there is at least one voltage transition without measurement between two adjacent measurement sequences including the positive measurement sequence and the negative measurement sequence in the plurality of measurement sequences; applying a drive signal, executing the plurality of measurement sequences in the measurement mode, and measuring an induced signal generated according to the drive signal; wherein each of the at least one positive measurement sequences includes a positive integration operation and a negative integration operation executed in sequence, and each of the at least one negative measurement sequences includes a negative integration operation and a positive integration operation executed in sequence, the executing the plurality of measurement sequences in the measurement mode includes: after executing the current measurement sequence among the plurality of measurement sequences except the last measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, performing a reverse operation on the drive signal.

2. The method according to claim 1, executing the current measurement sequence in the plurality of measurement sequences, comprising: performing two integration operations on the induced signal, in response to the current measurement sequence being a positive measurement sequence, the two integration operations include the positive integration operation and the negative integration operation executed in sequence, in response to the current measurement sequence being a negative measurement sequence, the two integration operations include the negative integration operation and the positive integration operation executed in sequence.

3. The method according to claim 2, executing the current measurement sequence in the plurality of measurement sequences, further comprising: performing a reverse operation on the drive signal before each integration operation of the two integration operations, so that the polarities of the drive signals before and after each integration operation are opposite and the polarity of the drive signal after the two integration operations is the same as the polarity when the drive voltage is applied.

4. The method according to claim 1, the number of the at least one positive measurement sequence is equal to the number of the at least one negative measurement sequence.

5. The method according to claim 4, the positive measurement sequences and the negative measurement sequences in the measurement mode alternate in a quantity of 2^N, where N is a natural number.

6. The method according to claim 1, after performing a reverse operation on the drive signal, directly execute the next measurement sequence.

7. The method according to any one of claims 1-6, the method further comprising: performing noise cancellation operations on the positive integrations of the corresponding positive measurement sequence and negative measurement sequence, and performing noise cancellation operations on the negative integrations of the corresponding positive measurement sequence and negative measurement sequence, so as to eliminate the noise accompanying the induced signal.

8. A signal measurement circuit, comprising: An acquisition module, configured to acquire a measurement mode, wherein the measurement mode includes a plurality of measurement sequences, the plurality of measurement sequences includes at least one positive measurement sequence and at least one negative measurement sequence corresponding to the at least one positive measurement sequence respectively, and there is at least one voltage transition without measurement between two adjacent measurement sequences including a positive measurement sequence and a negative measurement sequence in the plurality of measurement sequences; each of the at least one positive measurement sequences includes a positive integration operation and a negative integration operation executed in sequence, and each of the at least one negative measurement sequences includes a negative integration operation and a positive integration operation executed in sequence; A signal module, configured to apply a driving signal; A measurement module, configured to execute the plurality of measurement sequences in the measurement mode and measure an induction signal generated according to the driving signal; A reverse module, configured to, when the measurement module executes the plurality of measurement sequences in the measurement mode, after executing the current measurement sequence among the plurality of measurement sequences except the last measurement sequence, in response to the next measurement sequence having a polarity opposite to that of the current measurement sequence, perform a reverse operation on the driving signal.

9. The signal measurement circuit according to claim 8, the signal measurement circuit further comprises: An integration module, configured to perform two integration operations on the induction signal, in response to the current measurement sequence being a positive measurement sequence, the two integration operations include the positive integration operation and the negative integration operation executed in sequence, in response to the current measurement sequence being a negative measurement sequence, the two integration operations include the negative integration operation and the positive integration operation executed in sequence.

10. The signal measurement circuit according to claim 8, the reverse module is further configured to: perform a reverse operation on the driving signal before each integration operation of the two integration operations, so that the polarities of the driving signal before and after each integration operation are opposite and the polarity of the driving signal after the two integration operations is the same as the polarity when the driving voltage is applied.

11. The signal measurement circuit according to claim 8, the number of the at least one positive measurement sequence is equal to the number of the at least one negative measurement sequence.

12. The signal measurement circuit according to claim 11, the positive measurement sequences and the negative measurement sequences in the measurement mode alternate in a quantity of 2^N, where N is a natural number.

13. The signal measurement circuit according to claim 8, after performing a reverse operation on the driving signal, directly execute the next measurement sequence.

14. The signal measurement circuit according to any one of claims 8 - 13, the signal measurement circuit further comprises: An operation module, configured to perform noise cancellation operations on the positive integrations of the corresponding positive measurement sequence and negative measurement sequence, and perform noise cancellation operations on the negative integrations of the corresponding positive measurement sequence and negative measurement sequence, so as to eliminate the noise accompanying the induction signal.

15. A touch sensor, comprises: A touch detection circuit; and the signal measurement circuit according to any one of claims 8 - 14, Wherein, the touch detection circuit receives the driving signal and outputs the sensing signal, and the signal measurement circuit is coupled to the touch detection circuit.

16. The touch sensor according to claim 15, wherein the touch detection circuit includes a driving touch electrode and a sensing touch electrode. Wherein, the driving touch electrode and the sensing touch electrode are coupled, the driving touch electrode receives the driving signal, and the sensing touch electrode is coupled to output the sensing signal.

17. An electronic device, comprising the touch sensor according to claim 15 or 16.

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