CN115079859A - Touch control circuit with noise reduction function - Google Patents

Touch control circuit with noise reduction function Download PDF

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Publication number
CN115079859A
CN115079859A CN202210262213.6A CN202210262213A CN115079859A CN 115079859 A CN115079859 A CN 115079859A CN 202210262213 A CN202210262213 A CN 202210262213A CN 115079859 A CN115079859 A CN 115079859A
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CN
China
Prior art keywords
touch
sensing
circuit
signal
driving
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Pending
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CN202210262213.6A
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Chinese (zh)
Inventor
吕季桓
林春生
戴宏彦
杨镇源
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Mingshi Intellectual Property Group Co ltd
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Sitronix Technology Corp
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Publication of CN115079859A publication Critical patent/CN115079859A/en
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    • G—PHYSICS
    • 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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
    • G—PHYSICS
    • 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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • 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
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Noise Elimination (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The invention relates to a touch control circuit with reduced noise, which generates a corresponding output signal by performing differential compensation on a reference signal of a reference circuit and a sensing signal of a touch control sensing electrode through a differential operation module, thereby reducing the noise of the output signal of the touch control circuit.

Description

Touch control circuit with noise reduction function
Technical Field
The present invention relates to a sensing circuit, and more particularly, to a touch circuit with reduced noise.
Background
The operation principle of the projected capacitive panel is that when a human finger or other conductive object approaches an ITO (indium tin oxide) transparent electrode on the panel, the sensing capacitance generated between the human finger or other conductive object and the ITO transparent electrode is converted into an output signal through a sensing circuit and then is calculated by a subsequent logic circuit, and the output signal is converted into coordinate data which can be interpreted by an operation processing unit of the mobile device, so as to feed back a corresponding touch operation result.
As shown in fig. 1A and 1B, in general, a touch display device 10 of a mobile device is provided with a glass cover 12, a touch panel 14, a glass substrate 16, an air GAP, a glass substrate 22, a display electrode 24 and a glass substrate 26, which are stacked, that is, the touch panel 14 is disposed on the display electrode 24, for the light and thin design of the mobile device, the distance between the touch panel 14 and the display panel 20 is reduced and becomes closer to each other along with the sharing of the glass substrate 22, for example, the touch panel 14 and the display panel 20 are gradually moved to an on-cell touch display device 10A (see fig. 1B) from the conventional panel structure having the air GAP therebetween, the distance between the touch panel 14 and the display panel 20 is gradually reduced, resulting in the touch panel 14 being gradually closer to the display electrode 24 of the display panel 20, so that a coupling capacitor C is formed between the two P And the distance between the two is getting closer and closer to result in coupling capacitance C P Gradually increases in capacitance value.
Display noise (display noise) or environmental noise (environmental noise) is generated along with the coupling capacitor C P The gradually increased capacitance is further amplified, so that the display noise (display noise) or the environmental noise (environmental noise) is transmitted through the coupling capacitor C P The operation of the touch panel 14 is disturbed, and the touch accuracy of the touch panel 14 is reduced. Referring further to FIG. 2, noise N1, which indicates display noise or other environmental noise, is transmitted through coupling capacitor C P Coupled to the touch driving electrode TX, coupled to the touch sensing electrode RX through the sensing capacitor CR coupled between the touch driving electrode TX and the touch sensing electrode RX, or noise N1 coupled through the coupling capacitor C P Coupled to the touch sense electrode RX. Since the operational amplifier 30 receives the sensing signal at one end and the reference voltage V at the other end REF Therefore, the touch sensing electrode RX inputs the sensing signal S to the front end of the operational amplifier 30 1 ～S N The noise of N1 is added to the output signal OUT of the back end of the operational amplifier 30, which results in a decrease in the signal-to-noise ratio of the output signal OUT.
Based on the above problems, the present invention provides a touch circuit with reduced noise, which receives a reference signal of a reference circuit and a sensing signal of a touch sensing module by a differential operation module, so that the differential operation amplifying circuit generates a corresponding output signal by performing a differential compensation on the reference signal and the touch sensing module, thereby reducing the noise of the output signal.
Disclosure of Invention
An objective of the present invention is to provide a touch control circuit with reduced noise, in which a differential operation module generates a corresponding output signal by differentially compensating a reference signal of a reference circuit and a sensing signal of a touch control sensing module, so that noise carried by the reference signal and the sensing signal can be cancelled out, thereby obtaining an output signal with reduced noise.
An objective of the present invention is to provide a touch circuit with reduced noise, in which a differential operation module generates a corresponding output signal by differentially compensating two sensing signals of a touch sensing module, so that noises carried by the two sensing signals of the touch sensing module are cancelled out, thereby obtaining an output signal with reduced noise.
In view of the above, the present invention provides a touch circuit with reduced noise, which includes a touch driving module, a reference circuit, a touch sensing module and a differential operation module. The touch driving module receives a driving voltage, the reference circuit receives the driving voltage and is coupled to the touch driving module, and generates a reference signal to the differential operation module according to the driving voltage and one of a plurality of driving signals of the touch driving module. The touch sensing module is arranged on the touch driving module and coupled with at least one driving signal of the touch driving module to generate a sensing signal to the differential operation module, the differential operation module generates a corresponding first output signal according to the reference signal and the sensing signal, and because the noise of the reference signal and the noise of the first sensing signal are offset through the differential compensation of the differential operation module, the invention can reduce the noise of the output signal.
In view of the above, the present invention further provides the differential operation module receiving two sensing signals of the touch sensing module, and the differential operation module generating a second output signal according to the two sensing signals of the touch sensing module through differential compensation, so that the present invention can reduce the noise of the two sensing signals of the touch sensing module through differential compensation, thereby reducing the noise of the second output signal.
In view of the above, the present invention provides a touch circuit with reduced noise, which includes a plurality of touch driving electrodes, a plurality of touch sensing electrodes, a reference circuit and a plurality of differential operation units. The touch driving electrodes receive a driving voltage, the touch sensing electrodes are disposed on the touch driving electrodes, the touch driving electrodes are coupled with the touch sensing electrodes to generate a plurality of sensing signals correspondingly, and the touch sensing electrodes output the driving signals to the differential operation units, the reference circuit receives at least one driving signal of the touch driving electrodes and receives the driving voltage, so that the reference circuit generates a reference signal to a differential operation unit of the differential operation units according to the driving voltage and the corresponding at least one driving signal, and the differential operation unit receives a sensing signal of the sensing signals, so that the first differential operation unit generates a corresponding output signal through a differential compensation according to the reference signal and the received sensing signal, because the noise of the reference signal and the noise of the sensing signal are offset by the differential compensation, the invention can reduce the noise of the output signal.
In view of the above, the present invention further provides a second differential operation unit of the differential operation units coupled to the two touch sensing electrodes of the touch sensing electrodes for receiving the two sensing signals of the two touch sensing electrodes, wherein the second differential operation unit generates a second output signal according to the two sensing signals through differential compensation, so that the present invention can reduce the noise of the two sensing signals corresponding to the two touch sensing electrodes through differential compensation, thereby reducing the noise of the second output signal.
Drawings
FIG. 1A: which is a structural schematic diagram of a conventional touch display panel;
FIG. 1B: it is another structural schematic diagram of a conventional touch display panel;
FIG. 2: which is a circuit schematic diagram of a conventional touch circuit;
FIG. 3: which is a circuit schematic diagram of the touch circuit of the present invention;
FIG. 4: it is a signal state diagram of the touch circuit of the present invention;
FIG. 5: it is a graph of the input signal of the present invention; and
FIG. 6: which is a graph of the output signal of the present invention.
[ brief description of the drawings ]
10 touch control display device
10A touch display device
12 glass cover plate
14 touch panel
16 glass substrate
20 display panel
22 glass substrate
24 display electrode
26 glass substrate
30 differential operation unit
100 touch control circuit
101 touch electrode module
101T touch control driving module
101R touch sensing module
104 touch control substrate
200 display module
202 display electrode
300 differential operation module
301-30N differential operation unit
400 reference circuit
402 variable resistor
404 variable capacitance
500 switching circuit
502 selection unit
C P Coupling capacitor
CR sensing capacitor
D 1 ～D N Drive signal
D G Signal(s)
DRV drive end
GAP air GAP
GUARD protection terminal
IC integrated circuit
IN 1 ～IN N Input terminal
N1 noise
OUT output signal
OUT 1 A first output signal
OUT2 second output signal
OUT N The Nth output signal
PANEL PANEL
RX touch sensing electrode
RX 1-RXN touch sensing electrode
S 1 ～S N Sensing signal
S REF Reference signal
SI 1-SIN signal terminal
TX touch control driving electrode
TX1 TXN touch driving electrode
V REF Reference voltage
V TX Driving voltage
Detailed Description
In order to provide a further understanding and appreciation for the structural features and advantages achieved by the present invention, the following detailed description of the presently preferred embodiments is provided:
although certain terms are used herein to refer to particular components, those skilled in the art will appreciate that various other components are possible, and that the present specification and claims do not intend to distinguish between components that differ in name but not necessarily in technology. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. Furthermore, the term "coupled" is intended to include any direct or indirect connection. Thus, if a first device couples to a second device, that connection may be through a direct connection, or through an indirect connection via other devices and other connections.
In view of the problem that the conventional touch display panel generates coupling capacitance due to the close distance between the display electrode and the touch panel, and thus the noise of the display electrode or the external environment affects the operation of the touch panel.
The invention reduces the noise of the output signal of the touch control circuit through the differential compensation input signal, thereby improving the operation of the touch control panel.
Hereinafter, the present invention will be described in detail by illustrating various embodiments of the present invention with the aid of the drawings. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.
First, please refer to fig. 3, which is a circuit diagram of the touch circuit of the present invention, and fig. 4, which is a signal status diagram of the touch circuit of the present invention. As shown in the figure, a touch circuit 100 with noise reduction of the present embodiment includes a touch electrode module 101, a differential operation module 300 and a reference circuit 400, wherein the touch electrode module 101 is disposed on the display module 200, the touch electrode module 101 and the display module 200 are disposed on the PANEL, and the touch electrode module 101 includes a touch driving module 101T and a touch driving module 101TA touch sensing module 101R and a touch substrate 104, the touch driving module 101T receives the driving voltage V via the driving end DRV end TX The touch driving module 101T includes a plurality of touch driving electrodes TX 1-TXN, and the touch sensing module 101R includes a plurality of touch sensing electrodes RX 1-RXN. The differential operation module 300 has a plurality of differential operation units 301-30N, disposed on the integrated circuit IC, coupled to the reference circuit 400 and the touch sensing module 101R through signal terminals SI 1-SIN, further, the first differential operation unit 301 is coupled to the reference circuit 400 and the first touch sensing electrode RX1 located on the PANEL PANEL, and the second differential operation units 302-Nth differential operation units are respectively coupled to two touch sensing electrodes, for example, the second differential operation unit 302 is coupled to the second touch sensing electrode RX2 and the third touch sensing electrode RX 3. A coupling capacitor C is arranged between the touch substrate 104 and the display electrode 202 of the display module 200 P . The differential operation module 300 and the reference circuit 400 are disposed in the integrated circuit IC.
As shown in fig. 4, the touch driving module 101T is driven by a driving voltage V TX Generating a corresponding driving signal D 1 ～D N The touch sensing module 101R has a sensing capacitor CR between the touch sensing electrodes RX 1-RXN and the touch driving electrodes TX 1-TXN, such that the touch sensing module 101R couples the driving signal D via the touch sensing electrodes RX 1-RXN 1 ～D N To couple out the sensing signal S 1 ～S N And then input to the differential operation units 301-30N of the differential operation module 300 through the signal terminals SI 1-SIN.
Referring to fig. 3 and 4, the reference circuit 400 has a variable resistor 402 and a variable capacitor 404, the reference circuit 400 is coupled to the touch driving module 101T, and further as shown in fig. 4, the reference circuit 400 drives the touch driving module 101T according to the driving signal D of one of the touch driving electrodes TX1, TX2, … and TXN of the touch driving module 101T 1 、D 2 、…、D N Signal D of GUARD terminal GUARD G Directly receiving the noise N1 and according to the driving voltage V TX Generating a reference signal S REF The reference circuit 400 of the present embodiment is exemplified by a variable resistor 402 and a variable capacitor 404 for being input to the first differential operation unit 301It should be understood that the reference circuit 400 of the present invention may further include at least one passive component, i.e. a variable capacitor component, a variable inductor component, a variable resistor component or a combination thereof, for modulating the impedance to change the reference signal S REF Has an amplitude and a waveform which are similar or equal to those of the first sensing signal S 1 The amplitude and waveform of (a), wherein the variable capacitance element comprises at least one capacitor, the variable inductance element comprises at least one inductor, and the variable resistance element comprises at least one resistor.
Therefore, the first differential operation unit 301 is based on the reference signal S REF And a first sensing signal S of the first touch sensing electrode RX1 1 Through differential compensation, the corresponding first output signal OUT is generated 1 Correspondingly, the second differential operation unit 302 receives a second sensing signal S of the second touch sensing electrode RX2 2 A third sensing signal S with the third touch sensing electrode RX3 3 Thereby according to the second sensing signal S 2 And the third sensing signal S 3 Through differential compensation, the corresponding second output signal OUT is generated 2 Therefore, the Nth differential operation unit 30N generates the Nth output signal OUT in sequence N 。
Referring to fig. 3 and 4, the touch circuit 100 of the present embodiment further includes a switching circuit 500 coupled between the touch driving module 101T and the reference circuit 400, the switching circuit 500 includes a selection unit 502 coupled to the touch driving module 101T via a plurality of input terminals IN 1 ～IN N The touch driving electrodes TX 1-TXN are coupled to receive the driving signal D 1 ～D N Even further coupled to the GUARD terminal GUARD of the touch substrate 104, i.e. the received signal D G The switching circuit 500 is coupled to the touch driving electrodes TX1 TXN and the GUARD terminal GUARD, and the switching circuit 500 is coupled to the driving signal D during the touch operation 1 ～D N Signal D G Selects one or a part thereof to output, and thus transmits a corresponding driving signal to the reference circuit 400. Wherein a control signal from a digital control circuit (not shown) is inputted to the selection unit, the selection unit 502 is provided with the exception of the signal D for selecting the GUARD gate GUARD according to the embodiment G More, moreFrom a plurality of input terminals IN 1 ～IN N A signal D for selectively inputting the driving signal to the reference circuit 400 or more selectively selecting the GUARD terminal GUARD G Arranged from multiple input terminals IN 1 ～IN N One selection input driving signal is selectively inputted to the reference circuit 400 or even all of the selection input driving signals are selectively outputted to the reference circuit 400, i.e. the selection unit 502 can select more than one input signal, such as the driving signal D 1 ～D N Signal D G And outputs to the reference circuit 400. The digital control circuit described in this embodiment may be a timing control circuit of a display panel.
Referring back to fig. 4, the touch substrate 104 and the display electrode 202 have a coupling capacitor C therebetween P Thus coupling a capacitor C P Noise N1 is coupled to the touch driving electrodes TX1 TXN, and noise N1 is coupled to the touch sensing electrodes RX1 RXN through the sensing capacitors CR due to the sensing capacitors CR between the touch sensing electrodes RX1 RXN and the touch driving electrodes TX1 TXN. In another embodiment, noise N1 is transmitted through coupling capacitor C P Coupled to the touch sensing electrodes RX1 RXN, such that the touch sensing electrodes RX1 RXN input the sensing signal S of the differential operation module 300 1 ～S N Noise N1 is entrained. Further, the touch driving electrodes TX1 TXN selectively coupled by the switching circuit 500 also provide the driving signal D with the noise N1 1 ～D N Signal D G Therefore, the reference circuit 400 is dependent on the driving voltage V TX The reference signal S generating the entrained noise N1 is also the received driving signal REF As for the first differential operation unit 301, the switch circuit 500 is selectively coupled to the protection terminal GUARD in the present embodiment, i.e. the signal D containing the noise N1 is directly inputted G To the reference circuit 400 for generating a reference signal according to a signal D containing noise N1 G And a driving voltage V TX Generating a reference signal S containing noise N1 REF To the first differential operation unit 301. Thus, the first differential operation unit 301 receives the reference signal S of the noise N1 at two input terminals REF And a first sensing signal S containing noise N1 1 As shown in fig. 5.
Further, the reference signal S REF The reference circuit 400 generates the first sensing signal S by varying the impedance and the capacitance of the variable resistor 402 and the variable capacitor 404 1 I.e. the first sensing signal S 1 And a reference signal S REF Has almost the same amplitude and phase, so that the reference signal S is shown in FIG. 5 REF And the first sensing signal S 1 The waveform of the signal is an approximate waveform. Due to the reference signal S REF And the first sensing signal S 1 The noise N1 is entrained, so the differential operation of the first differential operation unit 301 is equivalent to compensating the signal and canceling the noise N1, thereby outputting the signal OUT 1 Is the signal without noise N1. Wherein the variable resistor 402 and the variable capacitor 404 change the impedance value and the capacitance value to change the reference signal S REF Magnitude of medium N1 noise, e.g. capacitance modulation 10 -11 F to 10 -6 F, resistance modulation 10 -11 Omega to 10 -6 Ω, the variable resistor 402 and the variable capacitor 404 are illustrated, and the present invention can further use at least one passive component, i.e. a variable capacitor component, a variable inductor component, a variable resistor component or a combination thereof, to modulate the impedance and change the reference signal S REF Has an amplitude and a waveform which are similar or equal to those of the first sensing signal S 1 The variable capacitance component comprises at least one capacitor, the variable inductance component comprises at least one inductor, and the variable resistance component comprises at least one resistor.
Referring to fig. 4 and 6 together, in the ideal circuit, the output signal OUT generated by the first differential operation unit 301 1 The waveform of the signal is shown as the first curve C1 when the first differential operation unit 301 is based on the reference signal S REF And the first sensing signal S 1 Generates an output signal OUT without differential compensation 1 The output signal OUT generated by the first differential operation unit 301 1 The waveform of the signal is shown as the second curve C2 when the first differential operation unit 301 is based on the reference signal S REF And the first sensing signal S 1 Producing an output via differential compensationSignal OUT 1 The output signal OUT generated by the first differential operation unit 301 1 The waveform of the signal is shown as the third curve C3. As can be seen from the comparison of the differences, the first arithmetic unit 301 of the present invention cancels the noise N1 to generate the output signal OUT 1 (third curve C3) is the output signal OUT of the approximate idealized circuit 1 (first curve C1). Therefore, the touch control circuit 100 of the present invention utilizes the differential operation units 301-30N of the differential operation module 300 to differentially compensate the received reference signal S REF Sensing signal S 1 ～S N Thus, a better output signal OUT can be generated under the condition of reducing noise 1 ～OUT N Furthermore, the differential operation module 400 can further generate any sensing signal S 1 ～S N By means of and sensing signal S 1 ～S N Or the reference signal S REF Performing an operation, such as converting any of the sensing signals S 1 ～S N By means of and sensing signal S 1 ～S N Or the reference signal S REF Performing an operation, such as a subtraction or an addition, to obtain a noise-reduced output signal OUT 1 ～OUT N The signal-to-noise ratio of touch is increased, so that a subsequent logic operation circuit (not shown) is not interfered by the noise N1, and the touch operation quality can be effectively improved.
In the above embodiments, the touch circuit with noise reduction of the present invention generates the output signal with noise reduction to the subsequent logic operation circuit by differentially compensating the reference signal and the corresponding sensing signal, or differentially compensating the two sensing signals, so that the subsequent logic operation circuit is not affected by noise, i.e. any sensing signal is operated with the sensing signal or the reference signal to obtain the output signal with low noise, thereby increasing the signal-to-noise ratio of touch.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention, which is intended to include all equivalent variations and modifications in shape, configuration, feature and spirit of the present invention as set forth in the appended claims.

Claims (12)

1. A touch circuit with reduced noise, comprising:
the touch control driving module receives a driving voltage;
a reference circuit, receiving the driving voltage and coupled to the touch driving module, and generating a reference signal according to the driving voltage and at least one signal provided by the touch driving module;
a touch sensing module coupled to the driving signal to generate a sensing signal; and
and a differential operation module coupled to the reference circuit and the touch sensing module for generating an output signal according to the reference signal and the sensing signal through differential compensation.
2. The touch circuit of claim 1, further comprising a switching circuit coupled between the reference circuit and the touch driver module, wherein an output of the switching circuit is coupled to the reference circuit, and a plurality of inputs of the switching circuit are coupled to the driving signals.
3. The touch circuit of claim 1, wherein the differential operational module comprises a first differential amplifier having two input terminals for receiving and operating the reference signal and the sensing signal, respectively, and an output terminal for generating the output signal.
4. The touch circuit of claim 1, wherein the reference circuit comprises at least one tunable passive component selected from a variable resistance component, a variable capacitance component, a variable inductance component, and combinations thereof.
5. A touch circuit with reduced noise, comprising:
the touch control driving module receives a driving voltage;
a touch sensing module for coupling two sensing signals according to two driving signals of the touch driving module; and
and a differential operation module coupled to the touch sensing module, the differential operation module receiving the two sensing signals and generating an output signal by differential compensation.
6. The touch circuit with noise reduction of claim 5, wherein the plurality of differential operational units are differential operational amplifiers, two input ends of the differential operational units respectively receive and operate the two sensing signals, and the differential operational amplifiers respectively generate the output signal at an output end.
7. A touch circuit with reduced noise, comprising:
the touch control driving electrodes are used for receiving a driving voltage and are arranged on a touch control substrate;
the reference circuit receives the driving voltage and at least one signal provided by the touch driving electrodes and the touch substrate, and generates a reference signal according to the driving voltage and the at least one signal;
a plurality of touch sensing electrodes coupled to the touch driving electrodes to generate a plurality of sensing signals; and
and a plurality of differential operation units coupled to the touch sensing electrodes and the reference circuit, wherein one of the differential operation units receives the reference signal and one of the sensing signals, and the differential operation unit generates an output signal according to the reference signal and the sensing signal through differential compensation.
8. The touch circuit of claim 7, further comprising a switching circuit coupled between the reference circuit and the touch driving electrodes, wherein an output terminal of the switching circuit is coupled to the reference circuit, and input terminals of the switching circuit are coupled to the touch driving electrodes.
9. The touch circuit of claim 7, wherein one of the differential operational units is a differential operational amplifier, two input terminals of the differential operational amplifier respectively receive the reference signal and one of the sensing signals, and an output terminal of the differential operational amplifier generates the output signal.
10. The touch circuit of claim 7, wherein the reference circuit comprises at least one tunable passive component selected from a group consisting of a variable resistance component, a variable capacitance component, a variable inductance component, and combinations thereof.
11. A touch circuit with reduced noise, comprising:
the touch control driving electrodes receive a driving voltage;
the touch sensing electrodes are coupled according to a plurality of driving signals of the touch driving electrodes to generate a plurality of sensing signals; and
the plurality of differential operation units are respectively coupled with the two touch sensing electrodes of the plurality of touch sensing electrodes and used for receiving two sensing signals of the plurality of sensing signals, and the plurality of differential operation units generate an output signal through differential compensation according to the two sensing signals of the plurality of sensing signals.
12. The touch circuit of claim 11, wherein the differential operational units are differential operational amplifiers, two input terminals of the differential operational amplifiers are coupled to the two touch sensing electrodes respectively, and receive and operate the two sensing signals of the sensing signals respectively, and the differential operational amplifiers generate the output signal at an output terminal respectively.
CN202210262213.6A 2021-03-16 2022-03-16 Touch control circuit with noise reduction function Pending CN115079859A (en)

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US63/161,458 2021-03-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116880715A (en) * 2023-09-05 2023-10-13 合肥创发微电子有限公司 Touch sensing circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8493356B2 (en) * 2010-04-22 2013-07-23 Maxim Integrated Products, Inc. Noise cancellation technique for capacitive touchscreen controller using differential sensing
KR102430780B1 (en) * 2017-09-08 2022-08-09 엘지디스플레이 주식회사 Touch display device, touch circuit, and touch sensing method
WO2019178740A1 (en) * 2018-03-20 2019-09-26 深圳市柔宇科技有限公司 Touch sensing circuit, touch panel, touch apparatus and touch method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116880715A (en) * 2023-09-05 2023-10-13 合肥创发微电子有限公司 Touch sensing circuit
CN116880715B (en) * 2023-09-05 2023-11-17 合肥创发微电子有限公司 Touch sensing circuit

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