Touch-control sensing system, capacitance sensing circuit and capacitance sensing method

A capacitive sensing and touch sensing technology, applied in the input/output process of electrical digital data processing, instruments, data processing, etc. The effect of the signal-to-noise ratio

Active Publication Date: 2011-08-17
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In addition, the measurement reference value of the capacitance to be measured in the single-ended sensing circuit is fixed, which makes it unable to effectively offset the noise from the outside, thereby making the signal-to-noise ratio (Noise-to-SignalRatio, NSR) of the single-ended sensing circuit Can't improve effectively

Method used

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  • Touch-control sensing system, capacitance sensing circuit and capacitance sensing method
  • Touch-control sensing system, capacitance sensing circuit and capacitance sensing method
  • Touch-control sensing system, capacitance sensing circuit and capacitance sensing method

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Embodiment Construction

[0068] 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.

[0069] 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.

[0070] In the following embodiments, a touch panel will be used as an exemplary embodiment of the touch inp...

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PUM

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Abstract

The invention provides a touch-control sensing system that comprises a touch-control input interface and a capacitance sensing circuit, wherein the touch-control input interface comprises a plurality of sensing capacitors that are used for outputting at least one waveform to be tested and at least one reference waveform; and the capacitance sensing circuit comprises a difference comparing unit that is used for receiving the waveform to be tested and the reference waveform and outputting a difference signal according to at least one positive edge difference and at least one negative edge difference between the waveform to be tested and the reference waveform. Furthermore, the invention also provides a capacitance sensing method.

Description

technical field [0001] The present invention relates to a sensing circuit and its method, and in particular to a capacitance sensing circuit and its method. Background technique [0002] In today's information age, human beings are increasingly dependent on electronic products. Notebook computers, mobile phones, personal digital assistants (personal digital assistants, PDAs), 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 required 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 such problems, manu...

Claims

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Application Information

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