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Touch sensing system, capacitance sensing device and capacitance sensing method

A capacitance sensing and capacitance sensing technology, which is applied in the direction of electrical digital data processing, instruments, and data processing input/output process, can solve problems such as insufficient accuracy, achieve accurate measurement results, and improve measurement efficiency.

Inactive Publication Date: 2011-08-24
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology

At the same time, the single-ended sensing circuit has a fixed measurement reference value of the capacitance to be measured, so the sensing circuit must reserve a large voltage space to cover large sensing changes, but its accuracy is relatively insufficient

Method used

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  • Touch sensing system, capacitance sensing device and capacitance sensing method
  • Touch sensing system, capacitance sensing device and capacitance sensing method
  • Touch sensing system, capacitance sensing device and capacitance sensing method

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Embodiment Construction

[0063] In the capacitive touch input interface, the capacitance value of the sensing capacitor is determined according to whether the position corresponding to the sensing capacitor on the touch input interface is touched. When the sensing capacitor is touched corresponding to the position on the touch input interface, the touched object will generate a corresponding capacitance change, and form a capacitance to be measured with the sensing capacitor.

[0064] In the embodiment of the present invention, besides the capacitance to be measured, capacitance values ​​of other sensing capacitors can be used as reference values ​​when measuring the capacitance to be measured. Therefore, after comparing the capacitance value to be measured with the reference capacitance value, the touch position of the touch object corresponding to the touch input interface can be determined.

[0065] In the following embodiments, a touch panel is used as an exemplary embodiment of the touch input in...

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Abstract

The invention relates to a touch sensing system, a capacitance sensing device and a capacitance sensing method. The touch sensing system comprises a touch input interface and at least one capacitance sensing device. The capacitance sensing device comprises a plurality of switching units and a differential sensing circuit. Each switching unit is connected with a corresponding sensing capacitor. The to-be-measured input end of the differential sensing circuit receives a to-be-measured capacitance value provided by at least one of the sensing capacitors, and the reference input end of the differential sensing circuit receives a reference capacitance value provided by at least one of the sensing capacitors. The differential sensing circuit compares the to-be-measured capacitance value with the reference capacitance value to output a first difference corresponding to the to-be-measured capacitance value and the reference capacitance value at the output end of the differential sensing circuit. According to the technical scheme provided by the invention, the measurement efficiency can be promoted by adjusting the measurement reference value of the to-be-measured capacitor.

Description

technical field [0001] The present invention relates to a sensing device and method thereof, in particular to a touch sensing system, a capacitive sensing device and a capacitive sensing method. Background technique [0002] In today's information age, human beings are increasingly dependent on electronic products. Notebook computers, mobile phones, personal digital assistants (PDA for short), digital walkmans and other electronic products have become indispensable application tools in the life and work of modern people. The above-mentioned electronic products all have an input interface for inputting the user's desired command, so that the internal system of the electronic product automatically executes the command. Currently, the most widely used input interface devices include a keyboard and a mouse. [0003] For users, using traditional input interfaces such as keyboards and mice will undoubtedly cause considerable inconvenience in some occasions. In order to solve su...

Claims

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Application Information

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IPC IPC(8): G06F3/044
Inventor 邓永佳林清淳洪敬和张岑玮林奕良蔡竣杰
Owner NOVATEK MICROELECTRONICS CORP
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