Touch sensing apparatus
First Claim
1. A touch sensing apparatus comprising:
- a panel unit including a plurality of driving electrodes and a plurality of sensing electrodes;
a driving circuit unit applying, at different times, a driving signal and a scanning signal having a frequency different from that of the driving signal to each of the plurality of driving electrodes;
a sensing circuit unit measuring a change in capacitance of a plurality of node capacitors in intersections of the plurality of driving electrodes and the plurality of sensing electrodes; and
a calculation unit determining a touch based on the change in the capacitance,the calculation unit calculating compensation data based on capacitance deviations generated in the plurality of node capacitors by the scanning signal having a different frequency than the driving signal,wherein the scanning signal has a frequency lower than that of the driving signal.
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Abstract
There is provided a touch sensing apparatus including: a panel unit including a plurality of driving electrodes and a plurality of sensing electrodes; a driving circuit unit applying one of a driving signal and a scanning signal having a frequency different from that of the driving signal, to each of the plurality of driving electrodes; a sensing circuit unit measuring a change in capacitance of a plurality of node capacitors generated in intersections of the plurality of driving electrodes and the plurality of sensing electrodes; and a calculation unit determining a touch based on a change in the capacitance, wherein when the scanning signal is applied to the plurality of driving electrodes, the calculation unit calculates capacitance deviations in the plurality of node capacitors from the deviations of changes in the capacitance generated by the plurality of node capacitors.
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Citations
14 Claims
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1. A touch sensing apparatus comprising:
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a panel unit including a plurality of driving electrodes and a plurality of sensing electrodes; a driving circuit unit applying, at different times, a driving signal and a scanning signal having a frequency different from that of the driving signal to each of the plurality of driving electrodes; a sensing circuit unit measuring a change in capacitance of a plurality of node capacitors in intersections of the plurality of driving electrodes and the plurality of sensing electrodes; and a calculation unit determining a touch based on the change in the capacitance, the calculation unit calculating compensation data based on capacitance deviations generated in the plurality of node capacitors by the scanning signal having a different frequency than the driving signal, wherein the scanning signal has a frequency lower than that of the driving signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensing apparatus comprising:
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a panel unit including a plurality of first electrodes extending in a first axial direction and a plurality of second electrodes extending in a second axial direction crossing the first axial direction; and a controller determining a touch by detecting a change in capacitance of a plurality of node capacitors formed between the plurality of first electrodes and the plurality of second electrodes, when a scanning signal having a different frequency than a driving signal is applied to the plurality of first electrodes, the controller calculates compensation data based on capacitance deviations generated in the plurality of node capacitors by the scanning signal having a different frequency than the driving signal, wherein the scanning signal has a frequency lower than that of the driving signal. - View Dependent Claims (9, 10, 11, 12)
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13. A touch sensing apparatus comprising:
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a panel unit including a plurality of driving electrodes and a plurality of sensing electrodes; a driving circuit unit applying, at different times, a driving signal and a scanning signal having a frequency different from that of the driving signal to each of the plurality of driving electrodes; a sensing circuit unit measuring a change in capacitance of a plurality of node capacitors in intersections of the plurality of driving electrodes and the plurality of sensing electrodes; and a calculation unit determining a touch based on the change in the capacitance, the calculation unit calculating compensation data based on capacitance deviations generated in the plurality of node capacitors by the scanning signal having a different frequency than the driving signal, and the sensing circuit unit comprising at least one capacitor to measure a change in capacitance, and the calculation unit adjusts capacitance of the at least one capacitor according to the compensation data.
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14. A touch sensing apparatus comprising:
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a panel unit including a plurality of first electrodes extending in a first axial direction and a plurality of second electrodes extending in a second axial direction crossing the first axial direction; and a controller determining a touch by detecting a change in capacitance of a plurality of node capacitors formed between the plurality of first electrodes and the plurality of second electrodes, when a scanning signal having a different frequency than a driving signal is applied to the plurality of first electrodes, the controller calculates compensation data based on capacitance deviations generated in the plurality of node capacitors by the scanning signal having a different frequency than the driving signal, and when the driving signal having a frequency higher than that of the scanning signal is applied to the first electrodes, the controller uses the compensation data to compensate for capacitance deviations in the plurality of capacitors such that changes in capacitance generated by the plurality of node capacitors are uniform.
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Specification