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Capacitance type touch control device and sensing method

A capacitive touch and touch sensing technology, applied in the field of sensing technology, can solve the problems of difficult to judge accurately, low signal-to-noise ratio, small capacitance change, etc.

Inactive Publication Date: 2014-02-12
ALCOR MICRO CORP
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Problems solved by technology

In addition, the amount of change in capacitance before and after the touch is quite small (only about a few tenths of a pF), so that the difference in the sensing signals output by the respective sensors before and after the touch is too small (only about a few mV), so that The signal-to-noise ratio (SNR) is low and it is difficult to accurately determine whether there is a touch event
In order to increase the signal-to-noise ratio (SNR) to improve the accuracy of positioning (sensing), the most direct way is to increase the amplitude of the excitation source (square wave pulse), but this will lead to problems of additional power consumption and cost

Method used

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  • Capacitance type touch control device and sensing method
  • Capacitance type touch control device and sensing method
  • Capacitance type touch control device and sensing method

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[0036] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements / members using the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0037] figure 1 A schematic diagram of a capacitive touch apparatus (capacitive touch apparatus) 10 according to an embodiment of the present invention is shown. see figure 1 , the capacitive touch device 10 includes: a capacitive touch panel (capacitive touch panel) 101 , a sensing device (sensing device) 103 , and a judgment unit (judgment unit) 105 . Wherein, the capacitive touch panel 101 may be a projected capacitive touch panel (projective capacitive touch panel), but not limited thereto. Under this condition, the capacitive touch panel 101 may include M*N or M+N XY sensing electrodes SE, where M*N represents the sensing resolution of the capacitive touch panel 101, which The d...

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Abstract

A capacitive touch apparatus and a sensing method thereof are provided. The capacitive touch apparatus includes an electrostatic detection panel, and a sensing device. The sensing device is coupled to the electrostatic detection panel, and configured to sense a variation of electrostatic field on the electrostatic detection panel, and generate at least one touch sensing signal accordingly.

Description

technical field [0001] The present invention relates to a sensing technology, and in particular to a capacitive touch device and a sensing method. Background technique [0002] The working principle of the projected capacitive touch panel is mainly to detect the "capacitance change" caused by the electrostatic capacitance of the finger to the inductive capacitance formed between the XY electrodes in the projected capacitive touch panel, and the common projected capacitive touch panel Panel positioning (sensing) methods include self-capacitance (or self-inductance) and mutual-capacitance (mutual-inductance). [0003] However, the more common self-capacitance and mutual-capacitance positioning (sensing) methods today must use an independent excitation signal (such as a square wave pulse) to charge the relevant capacitance. In addition, the amount of change in capacitance before and after the touch is quite small (only about a few tenths of a pF), so that the difference in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/0446G06F3/0416G06F3/041
Inventor 赖曜宏陈治雄卢志文郭亘伦
Owner ALCOR MICRO CORP
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