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US 10,122,360 B2Granted
Touch panel device
AssigneeDenso Wave Incorporated
InventorYuya Morita
Life of this patent
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Abstract
When sampling an A/D-converted data of a voltage signal that a touch IC outputs at a fixed period, a microcomputer of a touch panel device monitors a variation in data values within a monitoring time, and changes a timing of sampling the data when a frequency of the variation exceeds an allowed value. Then, the timing is kept constant and the data is sampled when the frequency of the variation is within a range of the allowed value.
Claims8
A touch panel device comprising:
- a touch panel operated by AC power supply, the touch panel being configured to receive an input of an operation instruction, from a user, controlling an apparatus;
- a signal output unit in communication with the touch panel, the signal output unit A/D converting a voltage signal corresponding to a change of capacitance in the touch panel and outputting converted data based on the converted voltage signal;
- and
- a control circuit in communication with the signal output unit, the control circuit being configured to:
- sample the converted data from the signal output unit at a predetermined period of time;
- determine whether a touch operation received by the touch panel has occurred or not based on the converted data acquired by sampling;
- output a determination result to the signal output unit;
- monitor and detect a variation of values of the converted data for the predetermined period of time;
- upon detecting that a frequency of the variation of the values exceeds an allowed value, change a timing of sampling the data to determine whether the touch operation of the touch panel occurred within the predetermined period of time;
- and
- upon detecting that the frequency of the variation of the values does not exceed the allowed value, maintain the timing and continue to sample the data.
8 more elements
Dependencies are inferred from the claim text.