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Electronic equipment, capacitive sensing system and detection method of capacitive sensing system

A sensing system and capacitance detection technology, applied in memory systems, program control design, electrical digital data processing, etc., can solve problems such as poor quality of sensing signals, affecting sensing accuracy, and inability to detect

Pending Publication Date: 2015-04-15
SHENZHEN FOCALTECH SYST
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Problems solved by technology

[0005] However, there is a parasitic capacitance between the sensor board and the ground terminal, and this parasitic capacitance is superimposed with the capacitance between the target object and the sensor board. If the capacitance between the target object and the sensor board is too small, the The quality of the sensing signal is too poor to detect, thus affecting the sensing accuracy

Method used

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  • Electronic equipment, capacitive sensing system and detection method of capacitive sensing system
  • Electronic equipment, capacitive sensing system and detection method of capacitive sensing system
  • Electronic equipment, capacitive sensing system and detection method of capacitive sensing system

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Embodiment Construction

[0194] As described in the background technology, the sensing accuracy of the capacitive sensing system of the existing electronic equipment is low, and there are many factors that affect the low sensing accuracy of the capacitive sensing system. After extensive research by the inventor It is found that there is a parasitic capacitance between the ground terminal of the capacitance detection circuit and the sensor board, and the ground terminal is usually loaded with a constant voltage signal, while the sensor board is loaded with a constantly changing voltage signal, so that the parasitic capacitance There is charge and discharge, and accordingly, the charge detected by the capacitance detection circuit includes not only the charge caused by the voltage change of the capacitance formed between the target object and the sensor plate, but also the charge caused by the voltage change of the parasitic capacitance, and then affect the sensing accuracy.

[0195] Based on the above ...

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Abstract

The invention discloses a capacitive sensing system, electronic equipment and a detection method of the capacitive sensing system. The capacitive sensing system comprises a sensor board and a capacitance detection circuit, wherein the sensor board is coupled with a target object in a capacitance manner to execute sensing operation; the capacitance detection circuit comprises a signal transmission end and an earthing end, and is used for providing a first excitation signal for the sensor board via the signal transmission end to drive the sensor board to execute sensing operation; the earthing end of the capacitance detection circuit is used for loading a first modulation signal; and the first excitation signal varies with the first modulation signal. With the adoption of the technical scheme, the sensing accuracy of the electronic equipment is improved.

Description

technical field [0001] The present invention relates to a capacitive sensing system, an electronic device having the capacitive sensing system, and a detection method of the capacitive sensing system, in particular to a fingerprint sensing system, having the fingerprint sensing system An electronic device of the system, and a detection method of a fingerprint sensing system. Background technique [0002] At present, more and more electronic devices (such as: mobile phones, tablet computers, etc.) will be equipped with one or more sensing systems, such as a touch sensing system for sensing touch operations, a sensor for sensing human biometrics, etc. Biometric sensing systems, etc., the biometrics include fingerprints, palm prints, etc., while touch sensing systems and biometric sensing systems mostly use capacitive sensing systems to perform sensing operations. [0003] The capacitive sensing system generally includes a sensor board for capacitively coupling to a target o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/00
CPCG06F3/0443G06F3/04166G06F3/044
Inventor 刘学春
Owner SHENZHEN FOCALTECH SYST
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