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Noise filtering method for capacitive touch panel

A technology of noise filtering and touch panel, which is applied to the input/output process of electrical digital data processing, instruments, and data processing, etc. Modular performance, shield reduction, effects of relaxing design constraints

Active Publication Date: 2012-10-31
ORISE TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the correlation between multiple frequencies is insufficient
Due to various reasons, the test results of different frequencies are inherently inconsistent, which brings many difficulties to the comparison

Method used

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  • Noise filtering method for capacitive touch panel
  • Noise filtering method for capacitive touch panel
  • Noise filtering method for capacitive touch panel

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Experimental program
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Embodiment Construction

[0036] figure 1 It is a flow chart of the implementation of the present invention, referring to the figure, the present invention is a method for filtering noise of a touch panel, at first starting from step 10, performing step 20 associated multi-scan, and this associated multi-scan refers to scanning the same channel more than once , the number of scans can be two times, three times, four times, five times, six times or more, then define a difference value, compare the results of multiple scans in step 30, if the results of all scans are mutually If the difference is greater than the given difference value, step 40 is performed; if any two of the results of all scans have any two differences smaller than the given difference value, then the two results with the smallest difference are the correct results, and after taking their average value , go to step 301 to store the scanned data. Step 40 judges that this is the number of scans, if it is the first scan, then get back to...

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Abstract

A noise filtering method for a capacitive touch panel comprises the steps of: carrying out scanning on one channel for more than one time, comparing scanned results and judging background noise by means of empty scanning.

Description

technical field [0001] The invention relates to a noise filtering method for a touch panel, in particular to a method for effectively filtering out noise on a capacitive touch panel by using associated multi-scan, empty scan, frequency hopping and long-range scan. Background technique [0002] With the wide application of capacitive touch screens, users are more and more receptive to capacitive touch screens. Currently capacitive touch systems are very expensive, hindering the further expansion of the market. Capacitive touch screens are sensitive to power supply noise, RF noise, and LCD noise. There are two types of power supply noise, one is power frequency noise (50 / 60Hz), and the other is switching power supply noise. The amplitude of power frequency noise is relatively large, usually tens of volts or even more than 200 volts. If the design parameters of the circuit system are incorrect, the system can enter a saturated state under certain conditions, making it impossi...

Claims

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Application Information

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IPC IPC(8): G06F3/044
Inventor 莫良华
Owner ORISE TECHNOLOGY CO LTD
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