Touch panel
AssigneeJapan Display Inc.
InventorKoji Nagata
Life of this patent
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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.
Claims9
A touch panel, comprising:
- a plurality of scanning electrodes;
- a plurality of detection electrodes which intersect the plurality of scanning electrodes;
- and
- a touch panel controller configured to perform a coordinate determination procedure by:
- inputting a continuous drive pulse train to the plurality of scanning electrodes for each one scanning period in turns;
- 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;
- generating a frequency spectrum of each of the at least two data sequences;
- comparing a signal strength of each frequency component between the frequency spectra of the at least two data sequences, and
- generating a frequency spectrum in which frequency components having different strengths have been corrected;
- and
- generating a detection signal from the frequency spectrum in which high frequency components having different strengths have been connected;
- wherein the touch panel controller is configured so that intervals of extracting a pulse are adjustable for each of the at least two data sequences according to a frequency of a target signal to be detected.
Dependencies are inferred from the claim text.