CN110174971A - Noise reduction method and device for touch signal, touch IC, touch display device - Google Patents

Abstract

The invention discloses a noise reduction method and device for a touch signal, a touch IC (integrated circuit) and a touch display device, which aim to solve the problems that the touch display device in the prior art is easy to generate misjudgment to cause misoperation due to the fact that the touch signal is easily interfered by a signal on the surface of a display panel, and further the sensing precision and the response speed of a touch panel are reduced. The noise reduction method for the touch signal comprises the following steps: acquiring a touch signal output by a touch electrode of a touch display panel; determining a corresponding reference interference signal according to a current display picture of the touch display panel when the touch signal is obtained; and performing noise reduction processing on the touch signal according to the reference interference signal.

Description

Noise reduction method and device for touch signal, touch IC, touch display device

technical field

The present invention relates to the technical field of semiconductors, and in particular, to a method and device for noise reduction of touch signals, a touch IC, and a touch display device.

Background technique

The current touch display devices include one-piece touch panel (One Glass Solution, OGS), On-cell, In-cell, etc. Among them, OGS is a touch screen attached to the surface of the liquid crystal display, and is equipped with an active pen, so as to realize the touch display function. In such a touch display device, the touch screen is easily interfered by the signal on the surface of the display screen, and even misjudgment leads to misoperation, thereby reducing the sensing accuracy and response speed of the touch screen. Surface touch noise (Touch Noise) has strict requirements. In-cell touch panel structures such as on-cell and in-cell, since the touch panel is closer to the display panel, the touch panel is more likely to be disturbed by the signals driving the display screen of the display panel.

That is, the touch display device in the prior art has the problem that the touch signal is easily interfered by the signal on the surface of the display panel, resulting in misjudgment and misoperation, thereby reducing the sensing accuracy and response speed of the touch panel.

SUMMARY OF THE INVENTION

The present invention provides a touch signal noise reduction method and device, a touch IC, and a touch display device, so as to improve the touch display device in the prior art that the touch signal is easily interfered by the signal on the surface of the display panel, resulting in errors A faulty action is caused by the judgment, thereby reducing the sensing accuracy and response speed of the touch panel.

An embodiment of the present invention provides a noise reduction method for a touch signal, including:

acquiring touch signals output by touch electrodes of the touch display panel;

determining a corresponding reference interference signal according to the current display image of the touch display panel when the touch signal is acquired;

According to the reference interference signal, noise reduction processing is performed on the touch signal.

In a possible implementation manner, the determining the corresponding reference interference signal according to the current display screen of the touch display panel when the touch signal is acquired includes:

determining a corresponding reference compensation mode according to the current display screen of the touch display panel when the touch signal is acquired;

According to the reference compensation mode, the corresponding reference interference signal is determined.

In a possible implementation manner, the determining the corresponding reference compensation mode according to the current display screen of the touch display panel when the touch signal is acquired, includes:

dividing a preset number of touch reporting times per interval into a detection cycle, where the preset number is less than the touch reporting rate;

Sequentially count the number of inversions of each data line and the number of transitions across gray levels in each of the detection periods;

A reference compensation mode corresponding to the detection period is determined according to the number of inversions and the number of inversion gray scales in the detection period.

In a possible implementation manner, determining the reference compensation mode corresponding to the detection period according to the number of inversions and the number of inversion grayscales in the detection period includes:

comparing the inversion times with a plurality of preset inversion times from high to low in turn, and sequentially comparing the inversion spanning grayscale number with a plurality of preset inversion spanning grayscale numbers from high to low;

When it is determined that the number of inversions is greater than one of the preset inversion times, and when it is determined that the number of grayscales that the inversion crosses is greater than one of the predetermined number of grayscales of the inversion, then it is determined that the detection period is related to the The preset inversion times and the reference compensation mode of the preset inversion spanning grayscale number correspond to each other.

In a possible implementation manner, the determining a corresponding reference interference signal according to the reference compensation mode includes:

The reference interference signal corresponding to the reference compensation mode is determined according to the pre-stored correspondence between the reference compensation mode and the reference interference signal.

In a possible implementation manner, before acquiring the touch signal output by the touch electrodes of the touch display panel, the noise reduction method further includes:

Acquire the noise waveform of the display module in the touch display panel when it displays multiple specific display images, and use the part of the noise waveform greater than the set threshold as the reference interference signal, wherein each specific display image It corresponds to the preset data inversion times and the preset inversion spanning grayscale number of a reference compensation mode.

In a possible implementation manner, the acquiring the touch signal output by the touch electrodes of the touch display panel includes:

A touch signal whose voltage value output by the touch electrodes of the touch display panel is greater than a preset voltage value is acquired.

In a possible implementation manner, performing noise reduction processing on the touch signal according to the reference interference signal includes:

The touch signal is subtracted according to the reference interference signal.

An embodiment of the present invention further provides a noise reduction device for touch signals, including a touch signal acquisition unit, a reference interference signal determination unit, and a noise reduction unit, wherein,

The touch signal acquisition unit is configured to acquire the touch signal output by the touch electrodes of the touch display panel;

The reference interference signal determination unit is configured to determine the corresponding reference interference signal according to the current display screen of the touch display panel when the touch signal is acquired;

The noise reduction unit is configured to perform noise reduction processing on the touch signal according to the reference interference signal.

In a possible implementation manner, the reference interference signal determination unit includes a reference compensation mode determination unit and a retrieval unit;

The reference compensation mode determination unit is configured to determine a corresponding reference compensation mode according to the current display screen of the touch display panel when the touch signal is acquired;

The retrieval unit is configured to determine a corresponding reference interference signal according to the reference compensation mode.

In a possible implementation manner, a reference interference signal acquisition unit is further included;

The reference interference signal acquisition unit is configured to acquire the noise waveform of the display module in the touch display panel when the display module is displayed on a plurality of specific display images, and use the part of the noise waveform that is greater than the set threshold as the reference The interference signal, wherein each of the specific display frames corresponds to a preset number of data inversions and a preset number of grayscales spanned by a reference compensation mode.

In a possible implementation manner, the noise reduction unit includes a first stage inverting proportional amplifier circuit, a second stage inverting adding circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor resistor, first capacitor and second capacitor, where,

The first end of the first resistor is configured to input the touch signal, and the second end of the first resistor is configured to be inversely proportional to the first end of the second resistor and the first stage the first input end of the amplifying circuit is electrically connected;

The second input end of the first-stage inverse proportional amplifier circuit is configured to be electrically connected to the first end of the first capacitor, and the output end of the first-stage inverse proportional amplifier circuit is configured to be connected to the second The second end of the resistor and the first end of the third resistor are electrically connected;

The second end of the first capacitor is configured to be electrically connected to ground;

The second end of the third resistor is configured to be electrically connected to the second end of the fifth resistor, the first end of the fourth resistor, and the first input end of the second-stage inverting adding circuit;

The first end of the fifth resistor is configured to input the reference interference signal;

The second end of the fourth resistor is configured to be electrically connected to the output end of the second-stage inverting and summing circuit;

The second input terminal of the second-stage inverting and summing circuit is configured to be electrically connected to the first terminal of the second capacitor;

The first end of the second capacitor is configured to be electrically connected to ground.

In a possible implementation manner, the resistance values of the first resistor and the second resistor are equal, the resistance values of the third resistor and the fourth resistor are equal, and the first capacitor and the first capacitor are equal to each other. The capacitances of the two capacitors are equal.

An embodiment of the present invention further provides a touch IC, including the noise reduction device provided by the embodiment of the present invention.

Embodiments of the present invention further provide a touch display device, including a display module, a touch module, and the touch IC provided by the embodiments of the present invention, wherein the touch module includes the touch control electrode.

The beneficial effects of the embodiments of the present invention are as follows: the noise reduction method for a touch signal provided by the embodiment of the present invention includes: acquiring a touch signal output by a touch electrode of a touch display panel; Control the current display screen of the display panel to determine the corresponding reference interference signal; perform noise reduction processing on the touch signal according to the reference interference signal, that is, when the touch display panel according to the embodiment of the present invention outputs the touch signal , the corresponding reference interference signal is determined according to the display screen of the touch display panel when the touch signal is output, and then the touch signal is denoised by the reference interference signal, so as to obtain a pure touch signal, which can improve the existing The touch display device in the art has the problem that the touch signal is easily interfered by the signal on the surface of the display panel, resulting in misjudgment and misoperation, thereby reducing the sensing accuracy and response speed of the touch panel.

Description of drawings

FIG. 1 is a flowchart of a method for noise reduction of touch signals according to an embodiment of the present invention;

FIG. 2 is a flowchart of a specific noise reduction method for a touch signal provided by an embodiment of the present invention;

3 is a schematic diagram of a noise interference signal according to an embodiment of the present invention;

4 is a schematic diagram of a noise standard provided by an embodiment of the present invention;

5 is a schematic flowchart of a method for determining a reference interference signal according to a display screen provided by an embodiment of the present invention;

6 is a schematic flowchart of a method for determining a reference compensation mode according to a display screen provided by an embodiment of the present invention;

FIG. 7 is a schematic flowchart of a method for determining a reference interference signal according to the number of inversions and the number of inversions spanning gray levels according to an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a method for determining a reference touch mode according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a structure of a touch display device and a flowchart of noise reduction processing provided by an embodiment of the present invention;

10 is a schematic diagram of a touch signal before noise reduction and during noise reduction according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a touch signal after noise reduction provided by an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a touch display device according to an embodiment of the present invention;

13 is a schematic diagram of a specific structure of a reference interference signal determination unit according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a specific touch display device according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a specific noise reduction unit provided by an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Unless otherwise defined, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of well-known functions and well-known components.

Referring to FIG. 1, an embodiment of the present invention provides a noise reduction method for a touch signal, including:

Step S100 , acquiring touch signals output by touch electrodes of the touch display panel. In a specific implementation, with regard to the step S100 , acquiring the touch signal output by the touch electrodes of the touch display panel may specifically include: acquiring a touch signal whose voltage value output by the touch electrodes of the touch display panel is greater than a preset voltage value. Signal. That is, when the voltage value of the touch signal is greater than the preset voltage value, it can be considered that the touch signal is a touch signal after interference, and then only the output touch signal with a larger signal value is processed. Only the disturbed signal can be accurately processed, and the normal touch signal is not subjected to subsequent correlation processing, which can greatly reduce the operation process of the touch display device while ensuring accurate noise removal.

Step S200: Determine the corresponding reference interference signal according to the current display image of the touch display panel when the touch signal is acquired.

Step S300 , performing noise reduction processing on the touch signal according to the reference interference signal. During specific implementation, for step S300, performing noise reduction processing on the touch signal according to the reference interference signal may specifically include: performing a subtraction operation on the touch signal according to the reference interference signal. During specific implementation, a circuit structure can be used to realize the process of subtracting the touch signal according to the reference interference signal.

The noise reduction method for a touch signal provided by an embodiment of the present invention includes: obtaining a touch signal output by a touch electrode of a touch display panel; and determining a corresponding reference according to the current display screen of the touch display panel when the touch signal is obtained interference signal; noise reduction processing is performed on the touch signal according to the reference interference signal, that is, when the touch display panel according to the embodiment of the present invention outputs the touch signal, it is determined according to the display screen of the touch display panel when the touch signal is output. The corresponding reference interference signal is obtained, and then the touch signal is denoised by the reference interference signal, so as to obtain a pure touch signal, which can improve the touch display device in the prior art that the touch signal is easily affected by the surface of the display panel. The problem is that the signal interference of the touch panel will cause misjudgment and lead to malfunction, thereby reducing the sensing accuracy and response speed of the touch panel.

In a specific implementation, as shown in FIG. 2 , before step S100 , that is, before acquiring the touch signal output by the touch electrodes of the touch display panel, the noise reduction method for the touch signal according to the embodiment of the present invention further includes: Step S400 , acquiring noise waveforms of a single display module in the touch display panel in a plurality of specific display images, and using a portion of the noise waveform greater than a set threshold as a reference interference signal, wherein each specific display image is associated with a reference The preset data inversion times of the compensation mode and the preset inversion grayscale number correspond.

That is, specifically, if the touch display device is a liquid crystal touch display device, after the LCD single unit of the liquid crystal screen is produced, it is used under a specific display screen (such as R/G/B Pattern) and a specific frequency (such as 60Hz). The oscilloscope measures the LCD surface noise waveform. The measured waveform is shown in Figure 3. It can be seen that there will be very high spikes in some frequency bands, and these spikes will interfere with the normal operation of the touch panel, and even cause misjudgment and lead to false positives. action, thereby reducing the sensing accuracy and response speed of the touch panel.

① Divide the tested frequency bands according to the Noise standard as shown in Figure 4, such as: 1.300≤F≤1.325,...1.625<F≤1.975...2.275<F≤2.300, etc. According to the Noise standard shown in Figure 4, the part of the noise waveform that is greater than the set threshold is used as the reference interference signal. For example, 1.300≤F≤1.325 greater than -42dBm is reserved, and the frequency band is less than or equal to -42dBm. removed, not as a reference interference signal.

② Store several specific display screens and the noise signal (noise) greater than the set threshold in the noise waveform is used as the reference interference signal, because the data line (Data) has a great influence on the touch signal, especially the overload pattern, that is, Since the load (Loading) is large, the noise is large. Common specific display images, for example, overloaded display images (such as R/G/BPattern), Skip sub pixel 255, H 1line, etc.

③ In a specific frequency band (such as the easy-to-fail frequency band 1.625<F≤1.975), under a specific Pattern (overloading Pattern), the tested noise is used as a reference interference signal. The reference interference signal can be set according to the actual use situation, so as to correspond to various complex application environments in actual use.

In a specific implementation, referring to FIG. 5 , for step S200 , determining the corresponding reference interference signal according to the current display screen of the touch display panel when the touch signal is acquired, which may specifically include:

Step S210: Determine a corresponding reference compensation mode according to the current display image of the touch display panel when the touch signal is acquired.

Step S220: Determine the corresponding reference interference signal according to the reference compensation mode. In specific implementation, for step S220, determining the corresponding reference interference signal according to the reference compensation mode may include: determining the reference interference signal corresponding to the reference compensation mode according to the pre-stored correspondence between the reference compensation mode and the reference interference signal. Specifically, the corresponding relationship between the reference compensation mode and the reference interference signal may be pre-stored in the touch display device, and then the corresponding reference interference signal may be obtained according to the reference compensation mode.

In the embodiment of the present invention, different reference compensation modes are entered according to the display screen of the touch display device, that is, the sub-gear arithmetic processing is performed, which can significantly improve the sensing accuracy and response speed of the touch.

In a specific implementation, referring to FIG. 6 , for step S210 , determining a corresponding reference compensation mode according to the current display screen of the touch display panel when the touch signal is acquired, which may specifically include:

Step S211 , dividing a preset number of touch reporting times per interval into a detection cycle, and the preset number is less than the touch reporting rate.

Step S212 , sequentially count the number of inversions of each data line in each detection period and the number of inversions across grayscales.

Step S213: Determine a reference compensation mode corresponding to the detection period according to the number of inversions and the number of inversion grayscales in the detection period.

In the embodiment of the present invention, the reporting rate is the number of times the touch IC reports the coordinates per unit time. Due to the real-time communication between the touch IC and the logic board (TCON), the cycle is divided based on the reporting rate, and the touch control can be performed more accurately. The control signal is detected and removed.

In specific implementation, referring to FIG. 7 , for step S213, according to the number of inversions and the number of inversion grayscales in the detection period, the reference compensation mode corresponding to the detection period is determined, which may specifically include:

Step S2131, sequentially comparing the number of inversions with a plurality of preset inversion times from high to low, and sequentially comparing the number of transitions across grayscales with a plurality of preset transitions across grayscales from high to low;

Step S2132, when it is determined that the number of inversions is greater than one of the preset inversion times, and when it is determined that the number of overturned grayscales is greater than one of the preset inversions of grayscales, then determine that the detection period has the preset number of inversions and the preset number of inversions. Inverts the corresponding reference compensation mode across the number of grayscales.

In the embodiment of the present invention, n detection periods T1 to Tn are divided according to the touch reporting rate, the logic board (TCON) receives the data transmitted by the graphics processing unit (GPU), and at the same time counts the number of flips a of the Data Line in each detection period It is compared with the number of flips across the grayscale b, and the number of flips Ax and the number of flipped grayscales Bx, and it is judged to enter the corresponding reference compensation mode (touch mode), as shown in Figure 8, if a≥A1 and b≥B1, then Enter the first touch mode; if a≥A2 and b≥B2, enter the second touch mode;...a≥An and b≥Bn, enter the nth touch mode, where A1>A2>... An, B1>B2>...Bn, this is a statistical comparison process for one detection period, and for the next detection period, such as T2, statistics and comparisons are still performed in this way, and the follow-up is the same.

The touch display device and the processing flow can be shown in FIG. 9 , wherein the upper figure in FIG. 9 is a schematic diagram of the structure of the touch display device. The touch display device can be a liquid crystal touch display device LCD, and the touch sensor can be a touch sensor. The touch electrode of the control display device, TCON can be the logic board of the touch display device, and the lower figure of FIG. 9 is a schematic flowchart of noise reduction processing, that is, the peak voltage of the touch signal can be stored for a short time through the sample and hold circuit. time to ensure that the A/D converter has sufficient time to complete the A/D conversion. Then the 8bit ADC converts the touch voltage signal into an 8bit digital signal, converts the collected touch signal V1 into a digital signal of b7...b0 and stores it in the address RAM, according to the determined touch mode, and then the Driver parses the digital signal. The digital signal passes through the address decoder to find the corresponding reference compensation signal V2, which is processed by the subtraction circuit. After digital-to-analog conversion, the analog signal waveforms obtained by the final compensation are shown in Figure 10 and Figure 11. Figure 10 is the waveform diagram of the touch signal before and during the noise reduction process, and Figure 11 is the touch signal after the noise reduction process. 10 and 11, it can be seen that after noise reduction processing, the peak interference of the touch signal of the touch display device has been greatly reduced, and both the time domain and the frequency domain meet the Noise standard requirements.

Based on the same inventive concept, an embodiment of the present invention further provides a touch signal noise reduction device, as shown in FIG. 12 , including a touch signal acquisition unit 100 , a reference interference signal determination unit 200 and a noise reduction unit 300 , wherein,

The touch signal acquisition unit 100 is configured to acquire the touch signal output by the touch electrodes of the touch display panel;

The reference interference signal determination unit 200 is configured to determine the corresponding reference interference signal according to the current display screen of the touch display panel when the touch signal is acquired;

The noise reduction unit 300 is configured to perform noise reduction processing on the touch signal according to the reference interference signal.

In a specific implementation, as shown in FIG. 13 , the reference interference signal determination unit 200 includes a reference compensation mode determination unit 210 and a retrieval unit 220;

The reference compensation mode determination unit 210 is configured to determine the corresponding reference compensation mode according to the current display screen of the touch display panel when the touch signal is acquired;

The retrieval unit 220 is configured to determine the corresponding reference interference signal according to the reference compensation mode.

In a specific implementation, as shown in FIG. 14 , the noise reduction apparatus further includes a reference interference signal obtaining unit 400;

The reference interference signal obtaining unit 400 is configured to obtain the noise waveform of the display module single in the touch display panel when displaying multiple specific display images, and use the part of the noise waveform greater than the set threshold as the reference interference signal, wherein, Each specific display frame corresponds to a preset number of data inversions and a preset number of grayscales spanned by a reference compensation mode.

In specific implementation, the noise reduction unit 300 may be specifically configured to perform a subtraction operation on the touch signal according to the reference interference signal, as shown in FIG. 15 , which may specifically include a first-stage inverse proportional amplifier circuit U1 , a second-stage Inverting addition circuit U2, first resistor R11, second resistor R12, third resistor R13, fourth resistor R14, fifth resistor R15, first capacitor C1 and second capacitor C2, wherein,

The first end of the first resistor R11 is configured to input the touch signal V1, and the second end of the first resistor R11 is configured to be the first end of the second resistor R12 and the first end of the first-stage inverse proportional amplifier circuit U1. The input terminal is electrically connected;

The second input terminal of the first-stage inverting proportional amplifier circuit U1 is configured to be electrically connected to the first terminal of the first capacitor C1, and the output terminal of the first-stage inverting proportional amplifier circuit U1 is configured to be connected to the second resistor R12. The second end and the first end of the third resistor R13 are electrically connected;

The second end of the first capacitor C1 is configured to be electrically connected to the ground;

The second end of the third resistor R13 is configured to be electrically connected to the second end of the fifth resistor R15, the first end of the fourth resistor R14, and the first input end of the second-stage inversion adding circuit U2;

The first end of the fifth resistor R15 is configured to input the reference interference signal V2;

The second end of the fourth resistor R14 is configured to be electrically connected to the output end of the second-stage inverting addition circuit U2;

The second input terminal of the second-stage inverting and adding circuit U2 is configured to be electrically connected to the first terminal of the second capacitor C2;

The first end of the second capacitor C2 is configured to be electrically connected to ground.

In specific implementation, the resistance values of the first resistor R11 and the second resistor R12 are equal, the resistance values of the third resistor R13 and the fourth resistor R14 are equal, and the capacitance values of the first capacitor C1 and the second capacitor C2 are equal.

That is, in the embodiment of the present invention, specifically, the first stage is an inverse proportional amplifier circuit. By setting the resistor R11=R12=5.1K, V3=-V1, and the measured touch signal V1 is inverted. Then through the second-stage inverting addition circuit, and the corresponding reference interference signal V2 is summed to realize the subtraction operation, Vctrl=R14/R13 (V1-V2), set the resistance R13=R14=10K, can get the compensated digital Signal: Vctrl=V1-V2, that is, the touch signal after removing the interference signal.

In a specific implementation, the reference compensation mode determination unit 210 may further include a detection period division unit, a statistics unit, and a comparison unit; wherein,

The detection cycle dividing unit is configured to divide a preset number of touch reporting times per interval into a detection cycle, and the preset number is less than the touch reporting rate;

a statistical unit, configured to count the number of inversions of each data line in each detection period and the number of transitions across grayscales in sequence;

The comparison unit is configured to determine a reference compensation mode corresponding to the detection period according to the number of inversions and the number of inversion gray scales in the detection period.

The comparison unit may further include a first comparison unit and a second comparison unit, wherein,

The first comparison unit is configured to sequentially compare the number of inversions with a plurality of preset inversion times from high to low, and sequentially compare the number of inversion spanning grayscales with a plurality of preset inversions spanning grayscale numbers from high to low Compare;

The second comparison unit is configured to determine that the detection period is the same as having the preset inversion time when it is determined that the number of inversions is greater than one of the preset inversion times, and when it is determined that the number of inversions spanning grayscales is greater than one of the preset inversions spanning grayscales The number of times corresponds to the reference compensation mode of the preset inversion spanning number of gray levels.

In a specific implementation, the noise reduction apparatus may further include a storage unit, and the storage unit is configured to determine the reference interference signal corresponding to the reference compensation mode according to the pre-stored correspondence between the reference compensation mode and the reference interference signal.

In a specific implementation, the noise reduction device may further include a selection unit, where the selection unit is configured to acquire a touch signal whose voltage value output by the touch electrodes of the touch display panel is greater than a preset voltage value.

Based on the same inventive concept, an embodiment of the present invention further provides a touch IC, including the noise reduction device provided by the embodiment of the present invention. That is, the touch noise reduction process in the embodiment of the present invention may be specifically implemented in a touch IC.

Based on the same inventive concept, an embodiment of the present invention further provides a touch display device, including a display module, a touch module, and a touch IC as provided in the embodiment of the present invention, wherein the touch module includes touch electrodes . The touch signal is a signal output by the touch signal in the touch mode.

The beneficial effects of the embodiments of the present invention are as follows: the noise reduction method for touch signals provided by the embodiments of the present invention includes: acquiring touch signals output by touch electrodes of a touch display panel; The display screen of the present invention determines the corresponding reference interference signal; according to the reference interference signal, noise reduction processing is performed on the touch signal, that is, when the touch display panel according to the embodiment of the present invention outputs the touch signal, The display screen of the touch display panel determines the corresponding reference interference signal, and then performs noise reduction processing on the touch signal through the reference interference signal, so as to obtain a pure touch signal, thereby improving the existence of the touch display device in the prior art. The touch signal is easily interfered by the signal on the surface of the display panel, resulting in misjudgment and misoperation, which in turn reduces the sensing accuracy and response speed of the touch panel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (15)

1. A noise reduction method for a touch signal is characterized by comprising the following steps:

acquiring a touch signal output by a touch electrode of a touch display panel;

determining a corresponding reference interference signal according to a current display picture of the touch display panel when the touch signal is obtained;

and performing noise reduction processing on the touch signal according to the reference interference signal.

2. The method of reducing noise according to claim 1, wherein the determining a corresponding reference interference signal according to a current display screen of the touch display panel when the touch signal is obtained includes:

determining a corresponding reference compensation mode according to the current display picture of the touch display panel when the touch signal is acquired;

and determining a corresponding reference interference signal according to the reference compensation mode.

3. The method of reducing noise according to claim 2, wherein the determining a corresponding reference compensation mode according to a current display frame of the touch display panel when the touch signal is acquired comprises:

dividing the touch reporting times of every preset number into a detection period, wherein the preset number is smaller than the touch reporting rate;

counting the turnover times and turnover crossing gray levels of each data line in each detection period in sequence;

and determining a reference compensation mode corresponding to the detection period according to the turnover times and the turnover grey number in the detection period.

4. The noise reduction method according to claim 3, wherein the determining the reference compensation pattern corresponding to the detection period according to the number of flipping times and the number of flipping gradations in the detection period comprises:

sequentially comparing the turning times with a plurality of preset turning times which are different from high to low, and sequentially comparing the turning spanning grey scale number with a plurality of preset turning spanning grey scale numbers from high to low;

and when the turning times are determined to be greater than one of the preset turning times and the turning spanning grey number is determined to be greater than one of the preset turning spanning grey numbers, determining that the detection period corresponds to a reference compensation mode with the preset turning times and the preset turning spanning grey number.

5. The noise reduction method according to claim 4, wherein the determining the corresponding reference interference signal according to the reference compensation pattern comprises:

and determining the reference interference signal corresponding to the reference compensation mode according to the pre-stored corresponding relation between the reference compensation mode and the reference interference signal.

6. The noise reduction method according to any one of claims 1 to 5, wherein before acquiring the touch signal output by the touch electrode of the touch display panel, the noise reduction method further comprises:

the method comprises the steps of obtaining noise waveforms of a display module monomer in a touch display panel when the display module monomer is in a plurality of specific display pictures, and taking a part of the noise waveforms, which is larger than a set threshold value, as a reference interference signal, wherein each specific display picture corresponds to the preset data turning times and the preset turning crossing gray scale number of a reference compensation mode.

7. The method for reducing noise according to claim 6, wherein the acquiring the touch signal output by the touch electrode of the touch display panel comprises:

and acquiring a touch signal of which the voltage value output by a touch electrode of the touch display panel is greater than a preset voltage value.

8. The noise reduction method according to claim 6, wherein the performing noise reduction processing on the touch signal according to the reference interference signal includes:

and performing subtraction operation on the touch signal according to the reference interference signal.

9. A touch signal noise reduction device is characterized by comprising a touch signal acquisition unit, a reference interference signal determination unit and a noise reduction unit,

the touch signal acquisition unit is configured to acquire a touch signal output by a touch electrode of the touch display panel;

the reference interference signal determining unit is configured to determine a corresponding reference interference signal according to a current display picture of the touch display panel when the touch signal is acquired;

the noise reduction unit is configured to perform noise reduction processing on the touch signal according to the reference interference signal.

10. The noise reduction apparatus according to claim 9, wherein the reference interference signal determining unit includes a reference compensation mode determining unit and an extracting unit;

the reference compensation mode determining unit is configured to determine a corresponding reference compensation mode according to a current display picture of the touch display panel when the touch signal is acquired;

the calling unit is configured to determine a corresponding reference interference signal according to the reference compensation mode.

11. The noise reduction apparatus according to claim 9 or 10, further comprising a reference interference signal acquisition unit;

the reference interference signal acquisition unit is configured to acquire noise waveforms of a display module monomer in a touch display panel when the display module monomer is in a plurality of specific display pictures, and use a part of the noise waveforms, which is larger than a set threshold value, as the reference interference signal, wherein each specific display picture corresponds to a preset data turning frequency and a preset turning crossing gray scale number of a reference compensation mode.

12. The noise reduction apparatus according to claim 9 or 10, wherein the noise reduction unit includes a first stage inverting proportional amplifying circuit, a second stage inverting addition circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor, wherein,

a first end of the first resistor is configured to input the touch signal, and a second end of the first resistor is configured to be electrically connected with a first end of the second resistor and a first input end of the first stage of inverting proportional amplifying circuit;

the second input end of the first-stage inverting proportional amplifying circuit is configured to be electrically connected with the first end of the first capacitor, and the output end of the first-stage inverting proportional amplifying circuit is configured to be electrically connected with the second end of the second resistor and the first end of the third resistor;

a second end of the first capacitor is configured to be electrically connected to ground;

a second end of the third resistor is configured to be electrically connected with a second end of the fifth resistor, a first end of the fourth resistor, and a first input end of the second stage inverting and adding circuit;

a first end of the fifth resistor is configured to input the reference interference signal;

a second terminal of the fourth resistor is configured to be electrically connected to an output terminal of the second stage inverting adder circuit;

the second input end of the second stage inverting and adding circuit is configured to be electrically connected with the first end of the second capacitor;

the first end of the second capacitor is configured to be electrically connected to ground.

13. The noise reduction device according to claim 12, wherein the first resistor and the second resistor have the same resistance, the third resistor and the fourth resistor have the same resistance, and the first capacitor and the second capacitor have the same capacitance.

14. A touch IC comprising the noise reduction apparatus of any one of claims 8-13.

15. A touch display device comprising a display module, a touch module, and the touch IC of claim 14, wherein the touch module comprises the touch electrode.