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Capacitance touch detection device and detection method thereof

A touch detection, capacitive technology, applied in the field of human body proximity detection devices, to achieve the effects of improving the signal-to-noise ratio, reliable work, and enhancing the ability to resist electromagnetic interference

Active Publication Date: 2009-04-29
SHENZHEN GOODIX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to adapt to the uncertainty caused by these environments is a problem that the existing capacitive touch detection technology has not yet solved.

Method used

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  • Capacitance touch detection device and detection method thereof
  • Capacitance touch detection device and detection method thereof
  • Capacitance touch detection device and detection method thereof

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and the preferred embodiments shown in the accompanying drawings.

[0031] see image 3 , Figure 4 , Figure 5 , a capacitive touch detection device, including an LC detection circuit 105 and a touch detection circuit 103: the LC detection circuit 105 is composed of a sensing electrode 101 and an inductive element 102 in a series or parallel mode; the touch detection circuit 103 includes an oscillation control Circuit 1031, frequency detection circuit 1032, internal resistance detection circuit 1033 and signal processing circuit 1034, the LC detection loop 105 is connected to the oscillation control circuit 1031; the signal processing circuit 1034 passes through the frequency detection circuit 1032 and internal resistance A detection circuit 1033 is connected to the oscillation control circuit 1031 .

[0032] The functional block diagram of an embodiment of ...

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Abstract

The invention discloses a capacitance touch detection device; an LC probing loop including an inductive electrode is connected with a touch detection circuit; the touch detection circuit comprises an oscillation control circuit, a frequency detection circuit, an internal resistance detection circuit and a signal processing circuit; the LC probing loop formed by combining the inductive electrode and a sensitive element is connected with the oscillation control circuit; the touch detection circuit is used for probing approach or contact response of the electrode on human body by detecting the resonance frequency and the internal resistance of the LC probing loop. The invention has good capability of anti-water coverage and anti-electromagnetic interference, and can probe the touch action reliably under complicated and rigorous environment.

Description

technical field [0001] The invention relates to a human body approach detection device, in particular to a touch detection device based on the capacitance detection principle. Background technique [0002] In recent years, capacitive touch detection technology has been widely used. Products using this technology have been recognized by the market for their longer life, more beautiful structure and more comfortable operation, and it also represents the development direction of modern products in terms of human-computer interaction. [0003] see figure 1 , the microcosmic principle of capacitive touch detection technology is: human tissue contains a large amount of electrolyte (lymph, blood, etc.), when the human hand is close to the sensing electrode, the distribution of the original electric field is changed, thereby changing the equivalent distributed capacitance parameter. [0004] see figure 2 , the current capacitive touch detection technology solutions all judge th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/0416G06F3/044
Inventor 柳玉平
Owner SHENZHEN GOODIX TECH CO LTD
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