CN112005201A - Touch sensing circuit, touch panel, touch device and touch method - Google Patents
Touch sensing circuit, touch panel, touch device and touch method Download PDFInfo
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- CN112005201A CN112005201A CN201880090443.0A CN201880090443A CN112005201A CN 112005201 A CN112005201 A CN 112005201A CN 201880090443 A CN201880090443 A CN 201880090443A CN 112005201 A CN112005201 A CN 112005201A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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Abstract
The invention discloses a touch sensing circuit, which is used for receiving and processing a touch sensing signal to identify touch operation and comprises an amplifying circuit, wherein the amplifying circuit comprises an amplifying module and a control circuit, and the amplifying module comprises an amplifying input end, an amplifying output end, an operational amplifier and an amplifying coefficient selection unit; when the operational amplifier receives the touch sensing signal from the amplification input end, the amplification factor selection unit provides a first amplification factor for the operational amplifier, and the amplification module amplifies the touch sensing signal according to the first amplification factor to obtain a first amplified signal; the control circuit calculates a first difference value between a preset signal and the first amplified signal, when the first difference value exceeds a preset range, the control circuit controls the amplification factor selection unit to provide a second amplification factor for the operational amplifier, the amplification module amplifies the touch sensing signal according to the second amplification factor to obtain a second amplified signal, and the second amplified signal is output from the amplification output end.
Description
The present invention relates to the field of touch technologies, and in particular, to a touch sensing circuit, a touch panel, a touch device and a touch method.
The touch panel generally includes a touch driving electrode and a touch sensing electrode insulated from each other, wherein the touch driving electrode and the touch sensing electrode form a touch sensing point at an intersecting position. The principle of the touch panel for realizing touch detection is as follows: the touch driving circuit provides a touch driving signal to the touch driving electrode through the touch driving line, the touch sensing electrode receives a touch sensing signal through the touch sensing point and transmits the touch sensing signal to the touch sensing circuit through the touch sensing line, and the touch sensing circuit performs signal processing on the received touch sensing signal to realize detection of touch operation.
The touch driving circuit and the touch sensing circuit are usually disposed on one side of the touch panel, and therefore, distances between each touch driving electrode and each touch sensing electrode in the touch panel and between the touch driving circuit and the touch sensing circuit are different. When the touch sensing circuit receives the touch sensing signal through the touch sensing line, the touch position far away from the touch sensing circuit is more easily interfered by external noise, so that when the touch position far away from the touch sensing circuit receives a touch operation, the signal-to-noise ratio of the touch sensing signal received by the touch sensing driving circuit is small, which may cause that the touch panel cannot detect the touch operation or cannot accurately identify the touch position, thereby reducing the accuracy of the touch panel in touch detection.
Disclosure of Invention
The embodiment of the invention provides a touch sensing circuit, a touch panel, a touch device and a touch method, wherein when a first amplification voltage is low, an amplification factor selection unit can dynamically adjust an amplification factor of an operational amplifier under the control of a control circuit, so that the accuracy of touch operation identification of the touch sensing circuit can be improved, and the stability of the amplification circuit can be ensured.
In a first aspect, an embodiment of the present invention provides a touch sensing circuit, configured to receive and process a touch sensing signal to identify a touch operation, where the touch sensing circuit includes an amplifying circuit configured to amplify the touch sensing signal, and the amplifying circuit includes an amplifying module and a control circuit, and the amplifying module includes an amplifying input terminal, an amplifying output terminal, an operational amplifier, and an amplification factor selecting unit, where the amplification factor selecting unit is configured to provide a plurality of amplification factors for the operational amplifier, and the operational amplifier and the amplification factor selecting unit are configured to amplify the touch sensing signal;
when the operational amplifier receives the touch sensing signal from the amplification input end, the amplification factor selection unit provides a first amplification factor for the operational amplifier, and the amplification module amplifies the touch sensing signal according to the first amplification factor to obtain a first amplified signal; the control circuit calculates a first difference value between the preset signal and a first amplified signal, when the first difference value exceeds a preset range, the control circuit controls the amplification factor selection unit to provide a second amplification factor for the operational amplifier according to the first difference value, and the amplification module amplifies the touch sensing signal according to the second amplification factor to obtain a second amplified signal and outputs the second amplified signal from the amplification output end.
In a second aspect, an embodiment of the present invention further provides a touch circuit, where the touch circuit includes the touch sensing circuit according to any one of claims 1 to 7 and a touch driving circuit; the touch driving circuit is electrically connected with the touch driving electrodes, the touch driving circuit is used for providing touch driving signals to touch sensing points so that the touch sensing points sense touch operation, the touch sensing points are used for generating touch sensing signals through sensing the touch operation, and the touch sensing electrodes receive the touch sensing signals through the touch sensing points and transmit the touch sensing signals to the touch sensing circuit.
In a third aspect, an embodiment of the present invention further provides a touch panel, where the touch panel includes the touch circuit of the second aspect, a plurality of touch driving electrodes arranged at intervals along a first direction, and a plurality of touch sensing electrodes arranged at intervals along a second direction, and the first direction and the second direction are perpendicular to each other; the touch driving electrode and the touch sensing electrode are insulated from each other, and touch sensing points are formed at the mutual crossing positions of the touch driving electrode and the touch sensing electrode; the touch driving circuit is used for providing touch driving signals to the touch driving electrodes so as to enable the touch sensing points to sense touch operation, the touch sensing points are used for generating touch sensing signals through sensing touch operation, and the touch sensing electrodes receive the touch sensing signals through the touch sensing points and transmit the touch sensing signals to the touch sensing circuit.
In a fourth aspect, an embodiment of the present invention further provides a touch device, where the touch device includes the touch panel of the third aspect.
In a fifth aspect, an embodiment of the present invention further provides a touch method applied to the touch sensing circuit, including:
receiving a touch sensing signal;
providing a first amplification factor to amplify the touch sensing signal and obtain a first amplified signal;
calculating a first difference value between the preset signal and the first amplified signal;
when the first difference value exceeds a preset range, providing a second amplification factor to amplify the touch sensing signal and obtain a second amplified signal;
outputting the second amplified signal.
In the embodiment of the invention, the amplification factor selection unit can improve the signal-to-noise ratio of the output voltage of the amplification circuit by providing different amplification factors for the operational amplifier, so that the accuracy of the touch sensing circuit for identifying touch operation can be improved. In addition, since the higher the amplification factor of the amplification circuit is, the worse the stability thereof is, the control circuit controls the amplification factor provided by the amplification factor selection unit for the operational amplifier through the first difference value, so that the stability of the amplification circuit can be ensured while the accuracy of the touch sensing circuit for identifying touch operation is improved.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a touch panel according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a touch sensing circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an amplifying circuit shown in fig. 2 according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart of a touch sensing method applied to the touch sensing circuit shown in fig. 1-3 according to an embodiment of the present invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. The embodiments of the present invention, all other embodiments obtained by those skilled in the art without any inventive work, shall fall within the scope of the present invention.
The embodiment of the invention provides a touch sensing circuit, which can dynamically adjust the amplification factor of an amplification circuit through an amplification factor selection unit, and can ensure the stability of the amplification circuit while improving the accuracy of touch detection of the touch sensing circuit. The touch sensing circuit, the touch circuit having the touch sensing circuit, the touch panel having the touch circuit, the touch device having the touch panel, and the touch method applied to the touch sensing circuit will be described in detail below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a touch panel according to an embodiment of the present invention. As shown in fig. 1, the touch panel includes a plurality of touch sensing electrodes 1 disposed at intervals along a first direction, a plurality of touch sensing electrodes 2 disposed at intervals along a second direction, and a touch circuit 3. The touch driving electrode 1 and the touch sensing electrode 2 are insulated from each other; the touch circuit 3 is electrically connected to the touch driving electrodes 1, and the touch circuit 3 is electrically connected to the touch sensing electrodes 2.
In the embodiment of the present invention, the touch driving electrodes 1 and the touch sensing electrodes 2 are arranged in a cross manner, and the touch driving electrodes 1 and the touch sensing electrodes 2 form touch sensing points 4 at the cross positions, as shown in fig. 1.
In the embodiment of the present invention, an intersection of the touch sensing areas of the touch sensing points 4 constitutes a touch detection area 5 of the touch panel. The range of the touch detection area 5 is schematically illustrated by taking a rectangle as an example in the embodiment of the present invention, but the shape of the touch detection area 5 is not particularly limited in the present invention in other embodiments.
In an embodiment of the present invention, the first direction and the second direction are perpendicular to each other. In the embodiments of the present invention, the first direction is a horizontal direction, and the second direction is a vertical direction, which are taken as examples for illustration, but in other embodiments, the present invention does not limit the first direction and the second direction to be perpendicular to each other.
In the embodiment of the present invention, the touch circuit 3 includes a touch driving circuit 31 (not shown) and a touch sensing circuit 32 (see fig. 2). The touch driving circuit 31 is electrically connected to the touch driving electrodes 1, and the touch sensing circuit 32 is electrically connected to the touch sensing electrodes 2.
In the embodiment of the present invention, the touch driving circuit 31 is configured to provide a touch driving signal to the touch driving electrodes 1 to enable the touch sensing points 4 to sense a touch operation. Specifically, the touch driving circuit 31 provides a touch driving signal to the touch driving electrodes 1 through a touch driving line so that the touch sensing points 4 sense a touch operation of a user in the touch detection area 5. The touch sensing points 4 are configured to generate touch sensing signals through sensing touch operations, and the touch sensing electrodes 2 are configured to receive the touch sensing signals through the touch sensing points 4 and transmit the touch sensing signals to the touch sensing circuit 32. Specifically, the touch sensing electrode 2 transmits the touch sensing signal to the touch sensing circuit 32 through a touch sensing line. The touch sensing circuit 32 is configured to receive and process the touch sensing signal to identify a touch operation.
In an embodiment of the present invention, the touch driving signal is any one of a pulse signal, a sine wave signal, and a triangular wave signal, but is not limited in other embodiments. The touch sensing signal carries capacitance information, and the touch sensing circuit 32 processes the touch sensing signal after converting the received capacitance information into voltage information. The capacitance information is a capacitance value or a capacitance variation, and the voltage information is a voltage value or a voltage variation, which is not limited in this embodiment of the present invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a touch sensing circuit according to an embodiment of the invention. As shown in fig. 2, the touch sensing circuit 32 includes a differential amplifying circuit 321, a low-pass filtering circuit 322, an amplifying circuit 323, an integrating circuit 324, a sampling circuit 325, and an analog-to-digital converting circuit 326.
In an embodiment of the present invention, the differential amplifying circuit 321 is configured to differentially amplify the touch sensing signal, specifically, the differential amplifying circuit 321 differentially amplifies the touch sensing signal received from two adjacent touch sensing electrodes 2. The low-pass filter circuit 322 is configured to perform noise reduction on the output signal of the differential amplifier circuit 321, specifically, the low-pass filter circuit 322 removes noise, such as radio frequency noise, from the output signal of the differential amplifier circuit 321. The amplifying circuit 323 is configured to amplify the output signal of the low-pass filter circuit 322, and the integrating circuit 324 is configured to accumulate the output signal of the amplifying circuit 323, specifically, the integrating circuit 324 accumulates the voltage signals output by the amplifying circuit 323 successively. The sampling circuit 325 is configured to sample the output signal of the integrating circuit 324, and the analog-to-digital conversion circuit 326 is configured to analog-to-digital convert the output signal of the sampling circuit 325 to convert the output signal of the sampling circuit 325 into digital data.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of an embodiment of the amplifying circuit shown in fig. 2. As shown IN fig. 3, the amplifying circuit 323 includes an amplifying module 3231, a detecting circuit 3232 and a control circuit 3233, and the amplifying module 3231 includes an amplifying input terminal IN1, an amplifying output terminal OUT1, an operational amplifier 32311 and an amplifying coefficient selecting unit 32312. The amplification factor selecting unit 32312 is configured to provide a plurality of amplification factors for the operational amplifier 32311, and the operational amplifier 32311 and the amplification factor selecting unit 32312 are configured to amplify the touch sensing signal.
IN the embodiment of the present invention, the operational amplifier 32311 includes a first input terminal IN2, a second input terminal IN3, a first power source terminal U1, a second power source terminal U2, and a first output terminal OUT 2. The first input terminal IN2 is electrically connected to the amplification input terminal IN1 through a first resistor R1 to receive the touch sensing signal, the first output terminal OUT2 is electrically connected to the amplification output terminal OUT1 to output the amplified touch sensing signal, and the second input terminal IN3 is electrically connected to a reference voltage terminal. In an embodiment of the present invention, the reference voltage terminal is a ground terminal, as shown in fig. 3.
IN an embodiment of the invention, the amplification factor selecting unit 32312 is electrically connected between the first input terminal IN2 and the first output terminal OUT2, the detecting circuit 3232 is electrically connected between the first output terminal OUT2 and the control circuit 3233, and the control circuit 3233 is electrically connected to the detecting circuit 3232 and the amplification factor selecting unit 32312, and is configured to output a corresponding control signal to the amplification factor selecting unit 32312 according to the first difference value, so as to control the amplification factor selecting unit 32312 to output the corresponding amplification factor.
It should be noted that, in some embodiments, the amplifying circuit 323 may not include the detecting circuit 3232, in which case the control circuit 3233 is directly electrically connected between the first output terminal OUT2 and the amplification factor selecting unit 32312.
IN an embodiment of the present invention, the amplification factor selecting unit 32312 includes a multiplexer 323121 and a plurality of feedback resistors R1 'to Rn' having different resistance values, and the multiplexer 323121 includes a selection input terminal IN4, a selection control terminal C1 and a plurality of selection output terminals OUT1 'to OUTn'. The selection input end IN4 is electrically connected with the first input end IN2 to receive the control signal, the selection control end C1 is electrically connected with the control circuit 3233, and the plurality of selection output ends OUT1 'to OUTn' are respectively electrically connected with the first output end OUT2 through the plurality of feedback resistors R1 'to Rn' IN a one-to-one correspondence relationship. The multiplexer 32312 electrically connects the selection input terminal IN4 with one of the selection output terminals according to the control signal, so that the operational amplifier 32311 provides an amplification factor corresponding to a feedback resistor electrically connected to the selection output terminal.
For convenience of description, the embodiment of the present invention is described by taking an example in which the multiplexer 323121 includes n selection outputs. As shown in fig. 3, the 1 st to nth selection outputs of the multiplexer 323121 are respectively denoted by OUT1', OUT2', …, OUTn ', and the feedback resistors corresponding to the 1 st to nth selection outputs in one-to-one correspondence are respectively denoted by R1', R2', …, Rn'.
IN one embodiment of the present invention, the second input terminal IN3 is electrically connected to the reference voltage terminal through a second resistor R2, the first power terminal U1 is connected to the first power supply, the second power terminal U2 is connected to the second power supply, and the first output terminal OUT2 is electrically connected to the reference voltage terminal through a third resistor R3, as shown IN fig. 3.
IN one embodiment of the present invention, the first input terminal IN2 is an inverting input terminal, the second input terminal IN3 is a non-inverting input terminal, the first power terminal U1 is a positive power terminal, and the second power terminal U2 is a negative power terminal, as shown IN fig. 3.
IN the embodiment of the present invention, when the operational amplifier 32311 receives the touch sensing signal from the amplification input terminal IN1, the amplification factor selection unit 32312 provides a first amplification factor to the operational amplifier 32311. Specifically, the multiplexer 323121 electrically connects the selection input IN4 to a default selection output to provide the first amplification factor for the operational amplifier 32311. The amplifying module 3231 amplifies the touch sensing signal according to the first amplification factor to obtain a first amplified signal, and outputs the first amplified signal from the first output terminal OUT 2.
Further, the detection circuit 3232 receives the first amplified signal and sends the first amplified signal to the control circuit 3233. The control circuit 3233 calculates a first difference between the preset signal and the first amplified signal, and when the first difference exceeds a preset range, the control circuit 3233 controls the amplification factor selection unit 32312 to provide a second amplification factor to the operational amplifier 32311 according to the first difference. Specifically, the control circuit 3233 generates a control signal according to the first difference, and sends the control signal to the selection control terminal C1. The control select terminal C1 receives the control signal from the control circuit 3233, the multiplexer 323121 determines a target select output terminal according to the control signal, and electrically connects the select input terminal IN4 to the target select output terminal to provide the operational amplifier 32311 with the second amplification factor corresponding to the feedback resistor electrically connected to the target select output terminal.
Wherein the target selection output end and the default selection output end are respectively different one of the plurality of selection output ends.
Further, the amplifying module 3231 amplifies the touch sensing signal according to the second amplification factor to obtain a second amplified signal, and outputs the second amplified signal from the amplification output terminal OUT 1.
It should be noted that the touch sense signal received by the operational amplifier 32311 from the amplification input terminal IN1 is a touch sense signal that is differentially amplified by the differential amplification circuit 321 and noise-reduced by the low-pass filter circuit 322.
In an embodiment of the present invention, the preset range is a non-negative number, the second amplification factor is greater than the first amplification factor, and the first amplification factor is the smallest amplification factor that the amplification factor selection unit 32312 can provide for the operational amplifier 32311.
In an embodiment of the present invention, the predetermined range is 0. In this embodiment, when the first amplification signal is smaller than the preset signal, the control circuit 323 controls the amplification factor selection unit 32312 to provide a larger amplification factor to the operational amplifier 32311.
In another embodiment of the present invention, the predetermined range is a positive number. In this embodiment, when the first amplification signal is smaller than the preset signal to a certain extent, the control circuit 323 controls the amplification factor selection unit 32312 to provide a larger amplification factor to the operational amplifier 32311.
In some embodiments, the second amplification factor satisfies a preset condition, and the preset condition is that a second difference between the preset signal and the second amplified signal does not exceed the preset range. As an alternative implementation manner, when there are a plurality of amplification factors corresponding to the feedback resistors that satisfy the preset condition, the multiplexer 323121 determines the selection output terminal corresponding to the feedback resistor with the smallest resistance value among the plurality of feedback resistors as the target selection output terminal, that is, the second amplification factor is the smallest amplification factor among the plurality of amplification factors that satisfy the preset condition.
Referring to fig. 4, fig. 4 is a schematic flow chart of a touch method applied to the touch sensing circuit shown in fig. 1-3 according to an embodiment of the present invention. The touch method of the embodiment of the invention is applied to the touch sensing circuit shown in the embodiment, and the touch method includes:
101: and receiving the touch sensing signal. Specifically, the touch sensing signal received by the operational amplifier 32311 from the amplifying input terminal IN1 is a touch sensing signal that is differentially amplified by the differential amplifying circuit 321 and noise-reduced by the low-pass filtering circuit 322.
102: and providing a first amplification factor to amplify the touch sensing signal and obtain a first amplified signal.
Specifically, the amplification factor selecting unit 32312 provides the operational amplifier 32311 with a first amplification factor, that is, the multiplexer 323121 electrically connects the selection input IN4 with a default selection output to provide the operational amplifier 32311 with the first amplification factor.
103: and calculating a first difference value of the preset signal and the first amplified signal.
Specifically, the amplifying module 3231 amplifies the touch sensing signal according to the first amplification factor to obtain a first amplified signal. Further, the amplifying module 3231 outputs the first amplified signal from the first output terminal OUT 2.
The detection circuit 3232 receives the first amplified signal from the first output terminal OUT2, and sends the first amplified signal to the control circuit 3233, and the control circuit 3233 receives the first amplified signal from the detection circuit 3232.
In another embodiment of the present invention, the control circuit 3233 receives the first amplified signal from the detection circuit 3232 via the first output terminal OUT 2.
104: and when the first difference value exceeds a preset range, providing a second amplification factor to amplify the touch sensing signal and obtaining a second amplified signal.
Specifically, when the first difference exceeds a preset range, the control circuit 3233 outputs the control signal according to the first difference, so as to control the amplification factor selection unit to provide a second amplification factor corresponding to the first difference for the operational amplifier.
Further, the control circuit 3233 generates a control signal according to the first difference, and sends the control signal to the selection control terminal C1. The control select terminal C1 receives the control signal from the control circuit 3233, the multiplexer 323121 determines a target select output terminal according to the control signal, and electrically connects the select input terminal IN4 to the target select output terminal to provide the operational amplifier 32311 with the second amplification factor corresponding to the feedback resistor electrically connected to the target select output terminal.
Wherein the target selection output end and the default selection output end are respectively different one of the plurality of selection output ends.
In the embodiment of the present invention, the preset range is a non-negative number, the second amplification factor is greater than the first amplification factor, and the first amplification factor is the smallest amplification factor that the amplification factor selection unit 32312 can provide for the operational amplifier 32311
105: outputting the second amplified signal.
Specifically, the amplifying module 3231 amplifies the touch sensing signal according to the second amplification factor to obtain a second amplified signal, and then outputs the second amplified signal from the amplification output terminal OUT 1.
In some embodiments, the second amplification factor satisfies a preset condition, and the preset condition is that a second difference between the preset signal and the second amplified signal does not exceed the preset range. As an alternative implementation manner, when there are a plurality of amplification factors corresponding to the feedback resistors that satisfy the preset condition, the multiplexer 323121 determines the selection output terminal corresponding to the feedback resistor with the smallest resistance value among the plurality of feedback resistors as the target selection output terminal, that is, the second amplification factor is the smallest amplification factor among the plurality of amplification factors that satisfy the preset condition.
In the touch panel and the touch method provided by the embodiment of the invention, the amplification factor selection unit 32312 can improve the signal-to-noise ratio of the output voltage of the amplification circuit 323 by providing different amplification factors for the operational amplifier 32311, so that the accuracy of the touch sensing circuit 32 in identifying touch operation can be improved. In addition, since the higher the amplification factor of the amplification circuit 323, the worse the stability thereof, the control circuit 3233 controls the amplification factor selection unit 32312 to provide the minimum amplification factor satisfying a preset condition for the operational amplifier 32311 by the first difference value, so that the stability of the amplification circuit 323 can be ensured while improving the accuracy of the touch sensing circuit 32 in recognizing a touch operation.
In an embodiment of the present invention, a touch device is further provided, where the touch device includes the touch panel. For example, the touch device may include, but is not limited to, a Mobile phone (e.g., an Android Mobile phone, an iOS Mobile phone, etc.) having the touch panel, a tablet computer, a Mobile Internet Device (MID), a Personal Digital Assistant (PDA), a notebook computer, a television, an electronic paper, a Digital photo frame, and the like.
The touch sensing circuit, the touch panel, the touch device and the touch method provided by the embodiment of the invention are described in detail, and a specific example is applied to explain the principle and the implementation of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (11)
- A touch sensing circuit for receiving and processing a touch sensing signal to identify a touch operation, the touch sensing circuit comprising an amplification circuit for amplifying the touch sensing signal,the amplifying circuit comprises an amplifying module and a control circuit, the amplifying module comprises an amplifying input end, an amplifying output end, an operational amplifier and an amplifying coefficient selecting unit, wherein the amplifying coefficient selecting unit is used for providing a plurality of amplifying coefficients for the operational amplifier, and the operational amplifier and the amplifying coefficient selecting unit are matched for amplifying the touch sensing signal;when the operational amplifier receives the touch sensing signal from the amplification input end, the amplification factor selection unit provides a first amplification factor for the operational amplifier, and the amplification module amplifies the touch sensing signal according to the first amplification factor to obtain a first amplified signal; the control circuit calculates a first difference value between the preset signal and a first amplified signal, when the first difference value exceeds a preset range, the control circuit controls the amplification factor selection unit to provide a second amplification factor for the operational amplifier according to the first difference value, and the amplification module amplifies the touch sensing signal according to the second amplification factor to obtain a second amplified signal and outputs the second amplified signal from the amplification output end.
- The touch sensing circuit of claim 1, wherein the amplification circuit further comprises a detection circuit configured to receive the first amplified signal and send the first amplified signal to the control circuit.
- The touch sensing circuit of claim 2, wherein the operational amplifier comprises a first input terminal, a second input terminal, and a first output terminal; the first input end is electrically connected with the amplifying input end through a first resistor to receive the touch sensing signal, the first output end is electrically connected with the amplifying output end to output the amplified touch sensing signal, and the second input end is electrically connected with a reference voltage end;the amplification factor selection unit is electrically connected between the first input end and the first output end;the detection circuit is electrically connected between the first output end and the control circuit;the control circuit is electrically connected to the detection circuit and the amplification factor selection unit, and is configured to output a corresponding control signal to the amplification factor selection unit according to the first difference value, so as to control the amplification factor selection unit to output the corresponding amplification factor.
- The touch sensing circuit of claim 3, wherein the amplification factor selection unit comprises a multiplexer and a plurality of feedback resistors having different resistance values, the multiplexer comprising a selection input terminal, a selection control terminal, and a plurality of selection output terminals; the selection input end is electrically connected with the first input end, the selection control end is electrically connected with the control circuit to receive the control signal, the selection output ends are respectively and electrically connected with the first output end through the feedback resistors in a one-to-one correspondence relationship, and the multiplexer electrically connects the selection input end with one of the selection output ends according to the control signal, so that the operational amplifier provides an amplification coefficient corresponding to the feedback resistor electrically connected with the selection output end.
- The touch sensing circuit of claim 4,when the operational amplifier receives the touch sensing signal from the amplification input end, the multiplexer electrically connects the selection input end with a default selection output end to provide the operational amplifier with the first amplification coefficient corresponding to a feedback resistor electrically connected to the default selection output end;the selection control terminal receives the control signal from the control circuit, the multiplexer determines a target selection output terminal according to the control signal, and electrically connects the selection input terminal and the target selection output terminal to provide the operational amplifier with the second amplification coefficient corresponding to the feedback resistor electrically connected to the target selection output terminal, wherein the target selection output terminal and the default selection output terminal are respectively one of different selection output terminals in the plurality of selection output terminals.
- The touch sensing circuit of claim 3, wherein the first input terminal is an inverting input terminal and the second input terminal is a non-inverting input terminal.
- The touch sensing circuit of claim 1, further comprising a differential amplification circuit, a low pass filter circuit, an integration circuit, a sampling circuit, and an analog-to-digital conversion circuit;when the touch sensing circuit receives the touch sensing signal, the differential amplification circuit is used for differentially amplifying the touch sensing signal, the low-pass filter circuit is used for reducing the noise of the output signal of the differential amplification circuit, the amplification circuit is used for amplifying the output signal of the low-pass filter circuit, the integration circuit is used for accumulating the output signal of the amplification circuit, the sampling circuit is used for sampling the output signal of the integration circuit, and the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the output voltage signal of the sampling circuit.
- A touch circuit, comprising the touch sensing circuit according to any one of claims 1 to 7 and a touch driving circuit; the touch driving circuit is electrically connected with the touch driving electrodes,the touch driving circuit is used for providing a touch driving signal to a touch sensing point so that the touch sensing point senses a touch operation, the touch sensing point is used for generating a touch sensing signal by sensing the touch operation, and the touch sensing electrode receives the touch sensing signal through the touch sensing point and transmits the touch sensing signal to the touch sensing circuit.
- A touch panel comprising the touch circuit of claim 8, a plurality of touch driving electrodes spaced along a first direction, and a plurality of touch sensing electrodes spaced along a second direction, wherein the first direction is perpendicular to the second direction;the touch driving electrode and the touch sensing electrode are insulated from each other, and touch sensing points are formed at the mutual crossing positions of the touch driving electrode and the touch sensing electrode;the touch driving circuit is used for providing touch driving signals to the touch driving electrodes so as to enable the touch sensing points to sense touch operation, the touch sensing points are used for generating touch sensing signals through sensing touch operation, and the touch sensing electrodes receive the touch sensing signals through the touch sensing points and transmit the touch sensing signals to the touch sensing circuit.
- A touch device, characterized in that the touch device comprises the touch panel according to claim 9.
- A touch method, comprising:receiving a touch sensing signal;providing a first amplification factor to amplify the touch sensing signal and obtain a first amplified signal;calculating a first difference value between the preset signal and the first amplified signal;when the first difference value exceeds a preset range, providing a second amplification factor to amplify the touch sensing signal and obtain a second amplified signal;outputting the second amplified signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/079609 WO2019178740A1 (en) | 2018-03-20 | 2018-03-20 | Touch sensing circuit, touch panel, touch apparatus and touch method |
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| CN112005201A true CN112005201A (en) | 2020-11-27 |
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| CN201880090443.0A Pending CN112005201A (en) | 2018-03-20 | 2018-03-20 | Touch sensing circuit, touch panel, touch device and touch method |
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| CN (1) | CN112005201A (en) |
| WO (1) | WO2019178740A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024087345A1 (en) * | 2022-10-27 | 2024-05-02 | 深圳市鸿合创新信息技术有限责任公司 | Touch area positioning method and apparatus, terminal device, and storage medium |
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| CN115079859A (en) * | 2021-03-16 | 2022-09-20 | 矽创电子股份有限公司 | Touch control circuit with noise reduction function |
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| WO2019178740A1 (en) | 2019-09-26 |
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