TWI684899B - Touch noise suppression method of touch and display driving integrated system, touch display device and handheld device adopting the method - Google Patents

Abstract

A touch noise suppression method for an integrated touch and display drive system, which is implemented by a control circuit, and includes the following steps: performing a plurality of touch frame scans in a touch detection process to obtain a touch of a plurality of frames Sensing data; and performing a statistical operation on the touch sensing data of the complex frame and performing a touch coordinate calculation program according to a statistical result obtained, wherein each of the touch frame scans includes complex line touches Controlled scanning procedure and at least one line of noise scanning procedure, the scanning signal of the touch scanning procedure has a first operating frequency, the scanning signal of the noise scanning procedure has a second operating frequency, and the plurality of touch frames The scanning has a plurality of different second operating frequencies, and when the noise value detected by the noise scanning process in any line of any one of the touch frame scans is greater than a preset value, the control circuit will A corresponding second operating frequency is set as the frequency to be removed and stored in a memory, so that in the next touch detection process, the first operating frequency is different from the memory stored in the memory The frequency of each rejection. In addition, the invention also discloses a touch display device adopting the touch noise suppression method.

Description

Touch noise suppression method of touch and display driving integrated system, touch display device and handheld device adopting the method

The invention relates to a touch detection mechanism of an integrated touch and display drive system, and particularly to a touch noise suppression method of an integrated touch and display drive system.

With the popularity and vigorous development of mobile devices, touch display devices have become one of the indispensable components. In the traditional touch display architecture, touch and display functions are independently controlled by a touch chip and a display chip, respectively, and the Touch and Display Driver Integration (TDDI) system uses touch The integration of the chip and the display chip into a single chip not only reduces the number of components, makes the screen thinner, but also improves the transmittance of the panel, and the battery life becomes relatively longer.

However, relatively, as the mobile phone becomes thinner and thinner, the driving electrode and the sensing electrode are located near the gate line and the data line, and are very susceptible to coupling interference caused by the voltage change of the data line. This type of internal noise will cause false and erroneous responses, resulting in inaccurate prediction of touch points and zigzag trajectories during touch operations, thereby affecting the user experience.

The touch noise suppression methods of the conventional technology mainly include the following two:

1. A noise frequency scanning process is added to the touch scanning process of the touch display device to detect a larger frequency range of noise, and then avoid the frequency range to perform the touch scanning process to achieve touch The purpose of noise suppression.

However, this method is only effective for noise in a fixed frequency range, but it does not work for noise data caused by impulse noise with strong transient energy.

Among them, transient refers to a system that is temporarily disturbed and suppressed, and it takes time to return to equilibrium; impulse noise refers to an interference signal with a short time but strong energy. The source may be caused by the switching of electrical products or emitted during use, which usually distort the received signal.

Second, use the method of setting the threshold to filter touch noise.

However, this method will affect the performance of noise data detection when the threshold is set too large, or when the threshold is set too small, it is easy to misjudge the touch of the finger, resulting in poor user experience.

In order to solve the above problems, a novel touch noise suppression method for an integrated touch and display drive integrated system is urgently needed in the art.

One object of the present invention is to disclose a touch noise suppression method for an integrated touch and display drive system, which can dynamically detect noise frequency adaptively to filter out pulse noise caused by relatively strong transient energy Noisy data to accurately calculate the touch coordinates.

Another object of the present invention is to disclose a touch display device that can adaptively dynamically detect noise frequency to filter out noise data caused by pulse noise with relatively strong transient energy, thereby accurately calculating the touch Control coordinates.

To achieve the aforementioned objective, a touch noise suppression method for an integrated touch and display drive system is proposed, which is implemented using a control circuit and includes the following steps: performing a plurality of touch frames in a touch detection process Scanning to obtain the touch sensing data of the complex frame; and performing a statistical operation on the touch sensing data of the complex frame and performing a touch coordinate calculation program according to a statistical result obtained, wherein each of the touch The frame scanning includes multiple lines of touch scanning procedures and at least one line of noise scanning procedures. The scanning signals of the touch scanning procedures have a first operating frequency, and the scanning signals of the noise scanning procedures have a second operating frequency. , The plurality of touch frame scans have a plurality of different second operating frequencies, and when any line of the noise scanning process of any one of the touch frame scans detects a noise value greater than a preset When the value is set, the control circuit sets a corresponding second operating frequency as the removed frequency and stores it in a memory to enable the first operating frequency in the next touch detection process It is different from the frequency of each rejection stored in the memory.

In an embodiment, the first operating frequency and the second operating frequency are the same or different.

In one embodiment, the noise scanning process includes using a noise detection module to perform a voltage comparison operation between a touch sensing result signal and a threshold.

In an embodiment, the statistical operation includes performing a comparison operation on the touch sensing data to generate a maximum value and a minimum value, and excluding the maximum value and the minimum value for the touch sensing The data is subjected to an accumulation operation and a normalized operation.

In one embodiment, the memory includes a register, a cache memory, or a random access memory.

To achieve the aforementioned objective, the present invention further provides a touch display device having a touch display driving circuit and a touch display panel, wherein the touch display driving circuit is used to drive the touch display panel, and the touch The control display driving circuit includes the control circuit to implement the touch noise suppression method.

In one embodiment, the touch display panel is composed of an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, and a capacitive touch A touch display panel selected by the group formed by the display panels.

In one embodiment, the touch display driving circuit includes a noise detection module for performing a voltage comparison operation between a touch sensing result signal and a threshold.

To achieve the aforementioned objective, the present invention further provides a handheld device having the aforementioned touch display device to provide a touch noise suppression function.

In one embodiment, the handheld device is a smart phone.

In order to enable your review committee to further understand the structure, features and purpose of the present invention, the drawings and detailed description of the preferred embodiments are attached as follows.

Please refer to FIG. 1, which illustrates a flowchart of an embodiment of a method for suppressing touch noise in the integrated touch and display driving system of the present invention.

As shown in FIG. 1, the touch noise suppression method of the integrated touch and display drive system of the present invention includes the following steps:

Performing a plurality of touch frame scans in a touch detection process to obtain touch sensing data of the multiple frames (step a); and performing a statistical operation on the touch sensing data of the multiple frames and according to the obtained A statistical result to perform a touch coordinate calculation program, wherein each of the touch frame scans includes a plurality of lines of touch scan programs and at least one line of noise scan programs, and the scan signal of the touch scan program has a first Working frequency, the scanning signal of the noise scanning process has a second working frequency, the plurality of touch frame scans has a plurality of different second working frequencies, and when any of the touch frames scans When the noise value detected by the noise scanning process in any line is greater than a preset value, the control circuit sets a corresponding second operating frequency as the frequency to be removed and stores it in a memory to In the next touch detection process, the first operating frequency is made to be different from each of the rejected frequencies stored in the memory (step b).

In the method of the present invention, the first operating frequency and the second operating frequency may be the same or different.

In a possible embodiment, the statistical operation includes performing a comparison operation on the touch sensing data to generate a maximum value and a minimum value, and removing the maximum value and the minimum value for the touch The sensing data is controlled to perform an accumulation operation and a normalization operation. The normalization operation is a commonly used method in statistics and is a conventional technique, so it will not be repeated here.

In addition, the memory may be, for example but not limited to, including a register, a cache memory, or a random access memory.

In addition, according to the above description, the present invention further discloses a touch display device.

Please refer to FIG. 2, which illustrates a touch display device adopting the aforementioned touch noise suppression method.

As shown in FIG. 2, a touch display device 100 has a touch display driving circuit 110 and a touch display panel 120, wherein the touch display driving circuit 110 is used to drive the touch display panel 120 to realize one touch Control display function, and the touch display driving circuit 110 has a control circuit 111 to realize the touch noise suppression method of the integrated touch and display driving system described above, wherein the control circuit 111 includes a noise detection module for In order to make a voltage comparison operation between a touch sensing result signal and a threshold to confirm a noise frequency. In addition, since a touch display driving circuit is used to drive a touch display panel to realize a touch display function, it is a conventional technology, so its principle will not be further described here.

In addition, the touch display panel 120 is composed of an optical linear touch display panel, a resistive touch display panel, an electromagnetic touch display panel, an acoustic wave touch display panel and a capacitive touch display panel A touch display panel selected by the formed group is not a detailed description here because the panels are all conventional technologies.

In addition, according to the above description, the present invention further discloses a handheld device.

Please refer to FIG. 3, which illustrates a block diagram of a handheld device using the touch display device of FIG. 2. As shown in the figure, a handheld device 200 can be a smart phone with a touch display device 100, and since the touch display device 100 uses the above-mentioned touch noise suppression method, the handheld device 200 can provide a Touch noise suppression function.

With the design disclosed above, the present invention has the following advantages:

1. The touch noise suppression method of the integrated touch and display drive system of the present invention can adaptively dynamically detect the noise frequency to filter out the noise data caused by the pulse noise with relatively strong transient energy, thereby Accurately calculate the touch coordinates.

2. The touch display device of the present invention can adaptively dynamically detect the noise frequency to filter out the noise data caused by the pulse noise with relatively strong transient energy, so as to accurately calculate the touch coordinates.

The case disclosed in this case is a preferred embodiment, and any part of the modification or modification that originates from the technical idea of this case and can be easily inferred by those skilled in the art, does not deviate from the patent scope of this case.

In summary, regardless of the purpose, means and efficacy, this case is showing that it has a technical feature that is very different from the conventional ones, and its first invention is in practical use, and it is also in compliance with the patent requirements of the invention. Granted patents as soon as possible to benefit the society and feel virtuous.

100‧‧‧Touch display device

110‧‧‧Touch display drive circuit

111‧‧‧Control circuit

120‧‧‧Touch display panel

200‧‧‧Handheld device

Step a‧‧‧ Perform multiple touch frame scans in a touch detection procedure to obtain the touch sensing data of the multiple frames

Step b‧‧‧ Perform a statistical operation on the touch sensing data of the complex frame and perform a touch coordinate calculation program according to one of the obtained statistical results, wherein each of the touch frame scans includes complex line touches Controlled scanning procedure and at least one line of noise scanning procedure, the scanning signal of the touch scanning procedure has a first operating frequency, the scanning signal of the noise scanning procedure has a second operating frequency, and the plurality of touch frames The scan has a plurality of different second operating frequencies, and when the noise value detected by the noise scanning process in any line of any one of the touch frame scans is greater than a preset value, the control circuit will A corresponding second operating frequency is set to the frequency that is removed and stored in a memory, so that in the next touch detection process, the first operating frequency is different from that stored in the memory The frequency of each rejection

FIG. 1 is a flowchart of an embodiment of a method for suppressing touch noise in the integrated touch and display driving system of the present invention. FIG. 2 illustrates a block diagram of a touch display device using the touch noise suppression method of FIG. 1. 3 is a block diagram of a handheld device using the touch display device of FIG. 2.

Step a‧‧‧ Perform multiple touch frame scans in a touch detection procedure to obtain the touch sensing data of the multiple frames

Step b‧‧‧ Perform a statistical operation on the touch sensing data of the complex frame and perform a touch coordinate calculation program according to one of the obtained statistical results, wherein each of the touch frame scans includes complex line touches Controlled scanning procedure and at least one line of noise scanning procedure, the scanning signal of the touch scanning procedure has a first operating frequency, the scanning signal of the noise scanning procedure has a second operating frequency, and the plurality of touch frames The scan has a plurality of different second operating frequencies, and when the noise value detected by the noise scanning process in any line of any one of the touch frame scans is greater than a preset value, the control circuit will One correspondence The second operating frequency is set to the frequency that is removed and stored in a memory, so that in the next touch detection process, the first operating frequency is different from each of the stored in the memory Frequency of rejection

Claims (9)

A touch noise suppression method for an integrated touch and display drive system, which is implemented by a control circuit, and includes the following steps: performing a plurality of touch frame scans in a touch detection process to obtain a touch of a plurality of frames Sensing data; and performing a statistical operation on the touch sensing data of the complex frame and performing a touch coordinate calculation program according to a statistical result obtained, wherein each of the touch frame scans includes a plurality of line touches Controlled scanning procedure and at least one line of noise scanning procedure, the scanning signal of the touch scanning procedure has a first operating frequency, the scanning signal of the noise scanning procedure has a second operating frequency, and the plurality of touch frames The scanning has a plurality of different second operating frequencies, and when the noise value detected by the noise scanning process in any line of any one of the touch frame scans is greater than a preset value, the control circuit will A corresponding second operating frequency is set as the frequency to be removed and stored in a memory, so that in the next touch detection process, the first operating frequency is different from the memory stored in the memory The frequency of each of the said is rejected. The touch noise suppression method of the integrated touch and display driving system as described in item 1 of the patent scope, wherein the first operating frequency and the second operating frequency are the same or different. The touch noise suppression method of the integrated touch and display drive system as described in item 1 of the patent scope, wherein the noise scanning process includes using a noise detection module to make a touch sensing result signal and a The threshold performs a voltage comparison operation. The touch noise suppression method of the integrated touch and display drive system as described in item 1 of the patent scope, wherein the statistical operation includes performing a comparison operation on the touch sensing data to generate a maximum value and a The minimum value, after removing the maximum value and the minimum value, perform an accumulation operation and a normalization operation on the touch sensing data. The touch noise suppression method of the integrated touch and display drive system as described in item 1 of the patent scope, wherein the memory includes a register, a cache memory, or a random access memory. A touch display device having a touch display drive circuit and a touch display panel, wherein the touch display drive circuit is used to drive the touch display panel, and the touch display drive The circuit includes the control circuit according to any one of claims 1 to 5 to realize the touch noise suppression method. The touch display device as described in item 6 of the patent application range, wherein the touch display panel is composed of an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, and an acoustic wave type A touch display panel selected by a group consisting of a touch display panel and a capacitive touch display panel. A hand-held device having a touch display device as described in item 6 of the patent application scope to provide a touch noise suppression function. The handheld device as described in item 8 of the patent application scope is a smart phone.

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