CAPACITIVE SENSING DEVICE AND CAPACITIVE SENSING METHOD
First Claim
1. A sensing method for a capacitive sensing device, comprising:
- detecting present measured values of a plurality of reference points selected from a plurality of sensing points, wherein the sensing points are defined by electrodes intersected with one another and the sensing point are configured to form an array, wherein the sensing points correspond to a plurality of respective reference measured values which is currently used, and wherein the reference points are located at the periphery of the array;
generating a present difference value according to the present measured values of the reference points and the reference measured values which are currently used;
comparing the present difference value with a second threshold;
executing a procedure for refreshing background noise to refresh the reference measured values which are currently used based on the present difference value when the present difference value is greater than the second threshold;
detecting a plurality of present measured values of the sensing points;
generating a plurality of position signals of the sensing points according to the present measured values of the sensing points and the reference measured values which are currently used; and
controlling the output of the position signals according to a reference signal.
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Abstract
A capacitive sensing method includes detecting present measured values of plural reference points from plural sensing points; generating a present difference value according to the present measured values of the reference points and current reference measured values; comparing the present difference value with a threshold; detecting present measured values of the sensing points; generating plural position signals of the sensing points according to the present measured values of the sensing points and the current reference measured values; and controlling the output of the position signals according to a reference signal. When the present difference value is greater than the threshold, executing a procedure for refreshing background noise to refresh the current reference measured values. The sensing points are defined by intersected electrodes, configured to form an array, and correspond to the current reference measured values. The reference points are located at the periphery of the array.
6 Citations
16 Claims
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1. A sensing method for a capacitive sensing device, comprising:
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detecting present measured values of a plurality of reference points selected from a plurality of sensing points, wherein the sensing points are defined by electrodes intersected with one another and the sensing point are configured to form an array, wherein the sensing points correspond to a plurality of respective reference measured values which is currently used, and wherein the reference points are located at the periphery of the array; generating a present difference value according to the present measured values of the reference points and the reference measured values which are currently used; comparing the present difference value with a second threshold; executing a procedure for refreshing background noise to refresh the reference measured values which are currently used based on the present difference value when the present difference value is greater than the second threshold; detecting a plurality of present measured values of the sensing points; generating a plurality of position signals of the sensing points according to the present measured values of the sensing points and the reference measured values which are currently used; and controlling the output of the position signals according to a reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A capacitive sensing device, comprising:
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a storage unit, storing a reference signal and a plurality of sets of reference measured values corresponding to respective present measured values, wherein one set of reference measured values is set to be used currently; a signal sensor, comprising a plurality of first electrodes and a plurality of second electrodes, wherein the first electrodes are intersected with the second electrodes, and the first electrodes and the second electrodes define a plurality of sensing points configured as an array, and wherein a plurality of reference measured values selected from each set of reference measured values corresponds to the respective sensing points; a driving/sensing unit, connected to the first electrodes and the second electrodes for detecting present measured values of the sensing points; a position sensing unit, connected to the driving/sensing unit and the storage unit for generating a present difference value according to the reference measured values which are currently used and present measured values of a plurality of reference points selected from the sensing points, generating a plurality of position signals according to the present measured values of the sensing points and the set of reference measured values which are currently used, and controlling the output of the position signals according to the reference signal, wherein the reference points are located at the periphery of the array; and a control unit, connected to the storage unit, the driving/sensing unit and the position sensing unit, for comparing the present difference value with a second threshold, wherein the control unit executes a procedure for refreshing background noise to refresh the set of reference measured values which are currently used based on the present difference value when the present difference value is greater than the second threshold. - View Dependent Claims (13, 14, 15, 16)
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Specification