Induction device and driving method
The technology of a sensing device and a driving method, which is applied in the field of electronics, can solve the problems of interference capacitance detection, the sensing system cannot work normally, and the reduction of the signal-to-noise ratio of the sensing device, so as to achieve the effect of improving the signal-to-noise ratio and anti-interference ability
Pending Publication Date: 2017-07-25
CHIPONE TECH BEIJINGCO LTD
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From the perspective of spectrum characteristics, these interference signals with usually narrow bandwidth will seriously interfere with the sensing device's detection of capacitance, and will reduce the signal-to-noise ratio of the sensing device, and even make the entire sensing system unable to work normally.
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[0025] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown in the drawings.
[0026] In the following, numerous specific details of the invention are described in order to provide a clearer understanding of the invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.
[0027] figure 1 A schematic diagram showing the basic principle of the sensing device according to the first embodiment of the present invention. figure 2 Shows figure 1 The enlarged cross-sectional schematic diagram of region A in middle.
[0028] like figure 1 and figure 2 As shown, the sensing device 100 has a touch surface with a plurality of elec...
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The invention discloses an induction device and a driving method, which can improve signal-noise ratio and interference immunity. The induction device comprises a sequence generator used for providing a driving signal and a bucking signal, a plurality of driving electrodes and sensing electrodes used for forming a plurality of induction capacitors, a front-end detection module used for changing the capacitance or capacitance variation of the induction capacitors into a plurality of first induction signals, a computation module used for attaining a plurality of second induction signals by computing the first induction signals according to the bucking signal, a cumulative filter module used for attaining a plurality of third induction signals by cumulating and filtering the second induction signals, and a communication module used for changing the third induction signals into data signals, wherein the data signals match the specified data format. The bucking signal and the driving signal are synchronistical, and show as a one-dimensional sequence over time respectively. Each sequence code of the driving signal sequence is multiplied with the relative sequence code of the bucking signal sequence to get 1.
Description
technical field [0001] The present invention relates to the field of electronic technology, and more specifically, to a sensing device and a driving method. Background technique [0002] Capacitive sensing technology is widely used in sensing devices such as touch screens and fingerprint recognition sensors. It mainly detects the position, shape or pressure and other information. Taking the capacitive fingerprint recognition sensor as an example, when the finger touches the surface of the sensing device, it will form a capacitance with the electrodes in the sensing device below the touch surface of the sensing device, thereby directly or indirectly changing the capacitance value of the capacitor in the sensing device ( In some sensing devices, self-capacitance techniques are utilized, while in others, mutual-capacitance techniques are used). The circuit in the sensing device detects the capacitance value or the variation of the capacitance value of the capacitor and obtain...
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Login to View More IPC IPC(8): G06F3/041G06F3/044G06K9/00
CPCG06F3/0416G06F3/044G06V40/1306
Inventor 李卓
Owner CHIPONE TECH BEIJINGCO LTD