Capacitive touch system with noise immunity

A capacitive, touch detection technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as circuit components

Inactive Publication Date: 2012-04-11
MICROCHIP TECH INC
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  • Application Information

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  • Capacitive touch system with noise immunity
  • Capacitive touch system with noise immunity
  • Capacitive touch system with noise immunity

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Embodiment Construction

[0020] By referring below Figure 1 to Figure 9 The preferred embodiment and its advantages over the prior art are best understood, where the same numbers are used to indicate the same and corresponding parts.

[0021] figure 1 A block diagram illustrating an exemplary relaxation oscillator-based touch sensor system 100 that detects a touch using conducted noise according to the present invention so that a touch can be detected in the presence or absence of conducted noise. Such as figure 1 As depicted in, the system 100 may include a touch sensor 200, a touch controller 400, and a host 600.

[0022] The touch sensor 200 is generally operable to receive input via contact with a human finger or other hand-held object (eg, stylus, credit card, etc.). Generally speaking, the touch sensor 200 is configured to recognize a touch event through a change in capacitance caused by the touch event. The touch sensor 200 may include one or more conductive elements that provide natural capacit...

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Abstract

Systems and methods for determining a user's touch in a capacitive touch sensor system is provided, including performing a series of potential touch detection tests for a plurality of sensors until a potential touch is detected and measuring a test frequency for one of the sensors, such that a potential touch may be detected when the measured test frequency deviates from a previously measured test frequency for the same sensor. After detecting a potential touch, the method may additionally include performing a series of baseline comparison tests for each of the sensors, for example, measuring a current frequency for one of the sensors, comparing the current frequency to a baseline frequency, and assigning a deviation value based on the comparison the current frequency and the baseline frequency. The method may identify the sensor with the largest deviation value as a touched sensor.

Description

[0001] Cross reference to related applications [0002] This application claims the rights and interests of the U.S. Provisional Application No. 61 / 224,975 filed on July 13, 2009, entitled "CAPACITIVE TOUCH SYSTEM WITH NOISE IMMUNITY", which stated The full text of the US provisional application is incorporated herein. Technical field [0003] The present invention relates to a capacitive touch sensor system, and more particularly, to an improved capacitive touch that uses conducted noise to detect a user's touch so that the user's touch can be detected in the presence or absence of conducted noise Sensor system. Background technique [0004] Capacitive touch sensors are used as user interfaces for electronic devices such as computers, mobile phones, personal portable media players, calculators, phones, cash registers, gasoline pumps, and so on. In some applications, opaque touch sensors provide soft key functions. In other applications, a transparent touch sensor overlays the di...

Claims

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Application Information

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IPC IPC(8): G06F3/044G06F3/041
CPCG06F3/0418G06F3/044G06F3/0445G06F3/0446G01R23/02G06F2203/04104
Inventor 基思·L·柯蒂斯斯蒂芬·B·波特伯克·T·戴维森阿雷利亚·弗洛里奇克-沃伊库
Owner MICROCHIP TECH INC
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