TOUCH PANEL
First Claim
1. A touch panel, comprising:
- a plurality of scanning electrodes;
a plurality of detection electrodes which intersect the plurality of scanning electrodes;
first means for inputting a continuous drive pulse train to the plurality of scanning electrodes for each one scanning period in turns;
second means for extracting pulses at different intervals from a continuous detection pulse train detected by the plurality of detection electrodes, and for generating at least two data sequences;
third means for generating a frequency spectrum of each of the at least two data sequences;
fourth means for comparing a signal strength of each frequency component between the frequency spectra of the at least two data sequences, and for generating a frequency spectrum in which frequency components having different strengths have been corrected; and
fifth means for generating a detection signal from the frequency spectrum generated by the fourth means.
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Accused Products
Abstract
Provided is a touch panel with improved anti-noise performance. A continuous drive pulse train is input to a plurality of scanning electrodes for each one scanning period in turns, and a detection pulse train generated at detection electrodes which intersects the scanning electrodes is detected. The detection pulse train is sampled at different intervals to generate a plurality of data sequences. The plurality of data sequences may be generated from the detection pulse train over a plurality of frame periods. A signal strength of each frequency component is compared between the frequency spectra of the plurality of data sequences, and a frequency spectrum in which frequency components having different strengths have been corrected is generated. A detection signal is generated from the corrected frequency spectrum.
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Citations
10 Claims
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1. A touch panel, comprising:
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a plurality of scanning electrodes; a plurality of detection electrodes which intersect the plurality of scanning electrodes; first means for inputting a continuous drive pulse train to the plurality of scanning electrodes for each one scanning period in turns; second means for extracting pulses at different intervals from a continuous detection pulse train detected by the plurality of detection electrodes, and for generating at least two data sequences; third means for generating a frequency spectrum of each of the at least two data sequences; fourth means for comparing a signal strength of each frequency component between the frequency spectra of the at least two data sequences, and for generating a frequency spectrum in which frequency components having different strengths have been corrected; and fifth means for generating a detection signal from the frequency spectrum generated by the fourth means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification