Noise suppression method and system for touch detection and touch terminal
First Claim
1. A noise suppression method for touch detection, comprising the following steps:
- before a normal scan, detecting an interference strength value at the current operating frequency point;
when the interference strength value is less than a first threshold value, driving a touching detection system with a driving frequency corresponding to the interference strength value at the current operating frequency point, else performing following steps;
sequentially driving a touch detection system with a plurality of driving frequencies supported by the touch detection system, and detecting an interference strength value of the touch detection system when driving with each driving frequency; and
frequency-hopping to a driving frequency corresponding to the minimum interference strength value, and driving the touch detection system to perform a normal operation with the driving frequency corresponding to the minimum interference strength value,wherein, the step of sequentially driving a touch detection system with a plurality of driving frequencies supported by the touch detection system, and detecting an interference strength value of the touch detection system when driving with each driving frequency includes the following steps;
driving the touch detection system with one driving frequency supported by the touch detection system, and obtaining an interference strength value at the current driving frequency;
judging whether the obtained interference strength value at the current driving frequency is greater than a predetermined first threshold value;
when the obtained interference strength value at the current driving frequency is greater than a predetermined first threshold value, further switching to another driving frequency supported by the touch detection system to drive the touch detection system, detecting and judging whether the current interference strength value is greater than the predetermined first threshold value, until interference strength values at a plurality of supported driving frequencies are obtained;
when consecutively detecting that interference strength values at a plurality of frequencies are all less than a predetermined second threshold value, quitting the current noise detection.
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Abstract
The present invention is applicable to the technical field of touch control. Provided are a touch detection system and a noise suppression method therefor. The method includes the steps of: sequentially driving a touch detection system with all driving frequencies that the touch detection system supports, and detecting a currently existing interference strength value when driving with each driving frequency; and frequency-hopping to the driving frequency corresponding to the minimum interference strength value, and driving the touch detection system with the driving frequency corresponding to the minimum interference strength value to perform a normal operation. By detecting an interference strength value at each driving frequency and then using the driving frequency corresponding to the minimum interference strength value as an operating frequency of a touch terminal, the present invention minimizes the signal interference of a touch detection system.
9 Citations
15 Claims
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1. A noise suppression method for touch detection, comprising the following steps:
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before a normal scan, detecting an interference strength value at the current operating frequency point;
when the interference strength value is less than a first threshold value, driving a touching detection system with a driving frequency corresponding to the interference strength value at the current operating frequency point, else performing following steps;sequentially driving a touch detection system with a plurality of driving frequencies supported by the touch detection system, and detecting an interference strength value of the touch detection system when driving with each driving frequency; and
frequency-hopping to a driving frequency corresponding to the minimum interference strength value, and driving the touch detection system to perform a normal operation with the driving frequency corresponding to the minimum interference strength value,wherein, the step of sequentially driving a touch detection system with a plurality of driving frequencies supported by the touch detection system, and detecting an interference strength value of the touch detection system when driving with each driving frequency includes the following steps; driving the touch detection system with one driving frequency supported by the touch detection system, and obtaining an interference strength value at the current driving frequency; judging whether the obtained interference strength value at the current driving frequency is greater than a predetermined first threshold value; when the obtained interference strength value at the current driving frequency is greater than a predetermined first threshold value, further switching to another driving frequency supported by the touch detection system to drive the touch detection system, detecting and judging whether the current interference strength value is greater than the predetermined first threshold value, until interference strength values at a plurality of supported driving frequencies are obtained; when consecutively detecting that interference strength values at a plurality of frequencies are all less than a predetermined second threshold value, quitting the current noise detection. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A noise suppression system for touch detection, the noise suppression system is configured to detect an interference strength value at the current operating frequency point before a normal scan, when the interference strength value is less than a first threshold value, the noise suppression system is configured to drive a touching detection system with a driving frequency corresponding to the interference strength value at the current operating frequency point, the noise suppression system comprising:
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a device comprising a processor and a storage device, wherein the storage device stores processor-executable programs to drive a touch detection system with a certain frequency; a drive control device comprising a processor and a storage device, wherein the storage device stores processor-executable programs configured to control the driving unit to sequentially drive the touch detection system with a plurality of driving frequencies supported by the touch detection system; an interference detecting device comprising a processor and a storage device, wherein the storage device stores processor-executable programs configured to detect an interference strength value of the touch detection system when the driving unit drives with each driving frequency; and a frequency-hopping device comprising a processor and a storage device, wherein the storage device stores processor-executable programs configured to frequency-hops to a driving frequency corresponding to the minimum interference strength value according to the detection result of the interference detecting unit, and thereby make the driving unit drive the touch detection system to perform a normal operation with the driving frequency corresponding to the minimum interference strength value, wherein, the interference detecting device includes; an interference strength detecting module comprising a hardware processor which is configured with;
when the driving device drives the touch detection system with a driving frequency supported by the touch detection system, obtain an interference strength value at the current driving frequency;a first judging module comprising a hardware processor which is configured to determine the interference strength value obtained by the interference strength detecting module and judge whether it is greater than a predetermined first threshold value; and a driving frequency switching module comprising a hardware processor which is configured to;
when the judging result of the first judging module is greater, further switch to another driving frequency supported by the touch detection system to drive the touch detection system, and trigger the drive control device to control the driving device to drive the touch detection system with the switched driving frequency;wherein, the first judging module and the driving frequency switching module repeat the judging and switching processes many times until interference strength values at a plurality of supported frequencies are obtained;
during this process, when the first judging module consecutively detects that interference strength values at a plurality of frequencies are all less than a predetermined second threshold value, the current noise detection is quitted. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification