TWI783456B - Scanning frequency determination method of touch device and touch display device and information processing device using same - Google Patents

Abstract

A scanning frequency determination method of a touch device, comprising: storing a scanning frequency table in a memory unit, the scanning frequency table including a plurality of scanning frequencies; using a touch scanning circuit to perform at least one operation on a capacitive sensor array Noise scanning operation to detect at least one noise frequency; and using a frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal, and make the touch The scanning circuit drives the capacitive sensor array to perform a touch scanning operation according to the excitation signal.

Description

Scanning frequency determination method of touch device and touch display device and information processing device using same

The present invention relates to a touch device, in particular to a method for determining a scanning frequency of a touch device.

Since the touch screen can provide a convenient input interface, many electronic devices adopt touch screens, especially capacitive touch screens.

The capacitive touch screen detects the position of the finger based on the capacitance change caused by the finger touching the screen. However, when there is interference noise of a specific frequency in the sensing circuit, it may cause false detection of the touch position and affect user experience.

In order to solve the above problems, some existing touch scanning devices add noise frequency scanning during the touch scanning process, so that the touch scanning frequency avoids the noise frequency, so as to avoid misjudgment of the touch position. However, since this method requires frequent communication between the processor and the touch scanning unit and needs to stop scanning and reconfigure the scanning frequency, it will seriously affect the scanning speed and reporting rate of the touch device.

In order to solve the above problems, there is an urgent need in the art for a novel method for determining the scanning frequency of a touch device.

One purpose of the present invention is to disclose a method for determining the scanning frequency of a touch device, which can use hardware logic to detect the noise frequency and automatically select a frequency different from the noise frequency from a frequency option table for touch scanning, thereby enabling Avoid frequent communication between touch scanning module and application processor.

Another object of the present invention is to disclose a method for determining the scanning frequency of a touch device, which can avoid the need to stop the touch scanning in the process of reconfiguring the scanning frequency to avoid the noise frequency while avoiding the noise. At the same time maintain a quick report point.

Another object of the present invention is to disclose a method for determining the scanning frequency of a touch device, which can use the existing touch scanning circuit to detect the noise frequency without additional noise frequency detection circuit.

To achieve the aforementioned purpose, a method for determining the scanning frequency of a touch device is proposed, which includes:

storing a scanning frequency table in a memory unit, the scanning frequency table including a plurality of scanning frequencies;

performing at least one noise scanning operation on a capacitive sensor array using a touch scanning circuit to detect at least one noise frequency; and

Using a frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal, and make the touch scanning circuit drive the capacitive sensor according to the excitation signal array for a touch scan operation.

In one embodiment, the noise scanning operation is to make the touch scanning circuit receive a response signal of the capacitive sensor array according to a test frequency without outputting the excitation signal, and between the response signal The test frequency is determined as the noise frequency when the voltage is greater than a threshold.

In one embodiment, when there is no scanning frequency different from the at least one noise frequency in the scanning frequency table, the touch device notifies an application processor to update the storage content of the scanning frequency table.

To achieve the aforementioned purpose, the present invention further proposes a touch display device, which has a touch device and a touch screen, wherein the touch device has a memory unit, a touch scanning circuit and a frequency selection module, The touch screen has a capacitive sensor array, and the touch device adopts a scanning frequency determination method, the method includes:

storing a scanning frequency table in the memory unit, the scanning frequency table including a plurality of scanning frequencies;

performing at least one noise scanning operation on the capacitive sensor array using the touch scanning circuit to detect at least one noise frequency; and

Using the frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal, and make the touch scanning circuit drive the capacitive sensor according to the excitation signal array for a touch scan operation.

In one embodiment, the noise scanning operation is to make the touch scanning circuit receive a response signal of the capacitive sensor array according to a test frequency without outputting the excitation signal, and between the response signal The test frequency is determined as the noise frequency when the voltage is greater than a threshold.

In one embodiment, when there is no scanning frequency different from the at least one noise frequency in the scanning frequency table, the touch device notifies an application processor to update the storage content of the scanning frequency table.

In one embodiment, the touch screen includes a display, and the display can be a liquid crystal display, a micro light emitting diode display, a mini light emitting diode display, a quantum dot light emitting diode display or an organic light emitting diode display .

In one embodiment, the capacitive sensor array is embedded in the display.

In addition, the present invention also proposes an information processing device, which has a central processing unit and the aforementioned touch display device, wherein the central processing unit is used to communicate with the touch display device.

In a possible embodiment, the information processing device can be a smart phone, a portable computer or an access control device.

In order to enable your review committee members to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

Please refer to FIG. 1 , which shows a flowchart of an embodiment of a method for determining a scanning frequency of a touch device according to the present invention, wherein the touch device uses a touch scanning circuit according to a touch scanning circuit when performing a touch scanning operation. An excitation signal of the scanning frequency drives a capacitive sensor array and receives a response signal, and judges whether there is a touch event according to a comparison result between the response signal and a threshold. As shown in Figure 1, the method for determining the scanning frequency of the touch device includes: storing a scanning frequency table in a memory unit, the scanning frequency table including a plurality of scanning frequencies (step a); performing at least one noise scan operation on the capacitive sensor array to detect at least one noise frequency (step b); and selecting one of said scans in the scan frequency table different from said at least one noise frequency using a frequency selection module frequency to generate an excitation signal, and make the touch scanning circuit drive the capacitive sensor array according to the excitation signal to perform a touch scanning operation (step c).

In step a, the stored content of the scanning frequency table can be updated by an application processor.

In step b, the noise scanning operation is to make the touch scanning circuit receive a response signal of a capacitive sensor array according to a test frequency without outputting the excitation signal, and the voltage of the response signal When it is greater than a threshold, the test frequency is determined to be the noise frequency.

In step c, when there is no scanning frequency different from the at least one noise frequency in the scanning frequency table, the touch device notifies the application processor to update the storage content of the scanning frequency table.

According to the above description, the present invention proposes a touch display device adopting the scanning frequency determination method. Please refer to FIG. 2 , which shows a block diagram of an embodiment of the touch display device of the present invention.

As shown in FIG. 2 , a touch display device 100 has a touch device 110 , a touch screen 120 and an application processor 130 , wherein the touch device 110 has a memory unit 111 and a touch scanning circuit 112 And a frequency selection module 113, the touch screen 120 has a capacitive sensor array 121 and a display 122, and the touch device 110 adopts a scanning frequency determination method, the method includes:

(1) A scanning frequency table is stored in the memory unit 111 , the scanning frequency table includes a plurality of scanning frequencies, and the stored content of the scanning frequency table can be updated by the application processor 130 .

(2) Use the touch scanning circuit 112 to perform at least one noise scanning operation on the capacitive sensor array 121 to detect at least one noise frequency, and transmit the data _DNF of the at least one noise frequency to the frequency selection module 113 , wherein the noise scanning operation is to make the touch scanning circuit 112 receive a response signal of the capacitive sensor array 121 according to a test frequency when the touch scanning circuit 112 does not output an excitation signal _ST , and The test frequency is determined as the noise frequency when the voltage of the response signal is greater than a threshold.

(3) Using the frequency selection module 113 to read the scan frequency data D _SF from the memory unit 111 to select a scan different from the data D _NF of the at least one noise frequency in the scan frequency table stored in the memory unit 111 The frequency data D _SF is used to generate the excitation signal S _T , and the touch scanning circuit 112 drives the capacitive sensor array 121 according to the excitation signal S _T to perform a touch scanning operation. In addition, when the scanning frequency table stored in the memory unit 111 does not have any of the scanning frequency data D _SF different from the at least one noise frequency data D _NF , the touch device 110 uses an interrupt signal INT to notify The application processor 130 enables the application processor 130 to output update data D _UDSF of the scan frequency data _DSF , so as to update the storage content of the scan frequency table.

According to the above description, the present invention further discloses an information processing device.

Please refer to FIG. 3 , which shows a block diagram of an embodiment of an information processing device of the present invention.

As shown in FIG. 3 , an information processing device 200 has a central processing unit 210 and a touch display device 220, wherein the touch display device 220 is realized by the touch display device 100, and the central processing unit 210 is Used to communicate with the application processor 130 .

In addition, in a possible embodiment, the information processing device 200 can be a smart phone, a portable computer or an access control device.

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

1. The method for determining the scanning frequency of the touch device of the present invention can use hardware logic to detect the noise frequency and automatically select a frequency different from the noise frequency from a frequency option table for touch scanning, thereby avoiding the touch scanning mode. Frequent communication between groups and application processors.

2. The scanning frequency determination method of the touch device of the present invention can avoid the need to stop the touch scanning in the process of reconfiguring the scanning frequency to avoid the noise frequency, and can maintain fast reporting while avoiding the noise.

3. The method for determining the scanning frequency of the touch device of the present invention can use the existing touch scanning circuit to detect the noise frequency, and no additional noise frequency detection circuit is required.

What is disclosed in this case is a preferred embodiment. For example, any partial changes or modifications derived from the technical ideas of this case and easily deduced by those who are familiar with the technology are within the scope of the patent right of this case.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand it clearly and grant a patent as soon as possible. Society is for the Most Prayer.

100: touch display device 110: Touch device 111: memory unit 112: Touch scanning circuit 113: Frequency selection module 120: touch screen 121: capacitive sensor array 122: display 130: application processor 200: Information processing device 210: central processing unit 220: touch display device Step a: store a scanning frequency table in a memory unit, the scanning frequency table includes a plurality of scanning frequencies Step b: Using a touch scanning circuit to perform at least one noise scanning operation on a capacitive sensor array to detect at least one noise frequency Step c: using a frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal, and make the touch scanning circuit drive the capacitor according to the excitation signal sensor array for a touch-scanning operation

FIG. 1 is a flowchart of an embodiment of a method for determining a scanning frequency of a touch device according to the present invention. FIG. 2 is a block diagram of an embodiment of the touch display device of the present invention. FIG. 3 shows a block diagram of an embodiment of the information processing device of the present invention.

Step a: store a scanning frequency table in a memory unit, the scanning frequency table includes a plurality of scanning frequencies Step b: Using a touch scanning circuit to perform at least one noise scanning operation on a capacitive sensor array to detect at least one noise frequency Step c: using a frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal, and make the touch scanning circuit drive the capacitor according to the excitation signal sensor array for a touch-scanning operation

Claims (8)

A scanning frequency determination method of a touch device, comprising: storing a scanning frequency table in a memory unit, the scanning frequency table including a plurality of scanning frequencies; using a touch scanning circuit to perform at least one operation on a capacitive sensor array Noise scanning operation to detect at least one noise frequency; and using a frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal, and make the touch The scanning circuit drives the capacitive sensor array according to the excitation signal to perform a touch scanning operation; wherein, when there is no scanning frequency different from the at least one noise frequency in the scanning frequency table, the touch The device notifies an application processor to update the storage content of the scanning frequency table. The method for determining the scanning frequency of a touch device as described in item 1 of the scope of the patent application, wherein the noise scanning operation is to make the touch scanning circuit receive the capacitance according to a test frequency without outputting the excitation signal A response signal of the type sensor array, and when the voltage of the response signal is greater than a threshold value, the test frequency is determined to be the noise frequency. A touch display device, which has a touch device and a touch screen, wherein, the touch device has a memory unit, a touch scanning circuit and a frequency selection module, and the touch screen has a capacitive sensor array, and the touch device adopts a scanning frequency determination method, the method includes: storing a scanning frequency table in the memory unit, the scanning frequency table includes a plurality of scanning frequencies; using the touch scanning circuit to the capacitive The sensor array performs at least one noise scanning operation to detect at least one noise frequency; and using the frequency selection module to select one of the scanning frequencies different from the at least one noise frequency in the scanning frequency table to generate an excitation signal , and make the touch scan circuit drive the capacitive sensor array according to the excitation signal to perform a touch scan operation; wherein, when the scan frequency table does not have any of the scans different from the at least one noise frequency When the frequency is selected, the touch device notifies an application processor to update the storage content of the scanning frequency table. The touch display device as described in item 3 of the scope of the patent application, wherein the noise scanning operation is to make the touch scanning circuit follow a test frequency without outputting the excitation signal A response signal of the capacitive sensor array is received, and the test frequency is determined to be the noise frequency when the voltage of the response signal is greater than a threshold. The touch display device as described in item 3 of the scope of patent application, wherein the touch screen includes a display, and the display is composed of a liquid crystal display, a micro light emitting diode display, a mini light emitting diode display, and a quantum dot light emitting device. A display selected from the group consisting of a diode display and an organic light emitting diode display. In the touch display device described in claim 5 of the patent application, the capacitive sensor array is embedded in the display. An information processing device, which has a central processing unit and the touch display device as described in any one of items 3 to 6 of the scope of the patent application, wherein the central processing unit is used to communicate with the touch display device. The information processing device described in item 7 of the scope of the patent application is a device selected from a group consisting of a smart phone, a portable computer and an access control device.

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