TOUCH SCREEN POWER-SAVING SCREEN SCANNING ALGORITHM
First Claim
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1. A method for detecting touch locations on a capacitive array, comprising the steps of:
- scanning for at least one touch location on an entire capacitive array using a first sensing circuitry;
detecting the at least one touch location with the first sensing circuitry;
determining a smaller portion of the capacitive array responsive to the detection of the at least one touch location;
scanning for the at least one touch location only within the smaller portion of the capacitive array using a second sensing circuitry operating;
detecting the at least one touch location with the second sensing circuitry; and
outputting the at least one touch location.
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Abstract
A method for detecting touch locations on a capacitive array includes the steps of scanning for at least one touch location on an entire capacitive array using a first sensing circuitry and detecting the at least one touch location with the first sensing circuitry. A smaller portion of the capacitive array is determined responsive to the detection of the at least one touch location. The at least one touch location is scanned only within smaller portion of the capacitive array using a second sensing circuitry. The at least one touch location is detected with the second sensing circuitry and output for use.
107 Citations
20 Claims
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1. A method for detecting touch locations on a capacitive array, comprising the steps of:
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scanning for at least one touch location on an entire capacitive array using a first sensing circuitry; detecting the at least one touch location with the first sensing circuitry; determining a smaller portion of the capacitive array responsive to the detection of the at least one touch location; scanning for the at least one touch location only within the smaller portion of the capacitive array using a second sensing circuitry operating; detecting the at least one touch location with the second sensing circuitry; and outputting the at least one touch location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting touch locations on a capacitive array, comprising the steps of:
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scanning each row and column of the capacitive array for at least one touch location using a first sensing circuitry; detecting the at least one touch location with the first sensing circuitry on at least one of the rows and columns; determining at least one smaller portion of the capacitive array responsive to the detection of the at least one touch location on the at least one of the rows and columns; scanning each intersection of the rows and columns within the at least one smaller portion of the capacitor array for the at least one touch location using a second sensing circuitry; detecting the at least one touch location with the second sensing circuitry within the at least one smaller portion of the capacitor array; and outputting the at least one touch location. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for detecting touch locations on a capacitive array, comprising the steps of:
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scanning each row and column of the capacitive array for at least one touch location using a capacitive sense circuitry operating in a fast scanning mode of operation; detecting the at least one touch location with the capacitive sense circuitry on at least one of the rows and columns; determining at least one smaller portion of the capacitive array responsive to the detection of the at least one touch location on the at least one of the rows and columns; scanning each intersection of the rows and columns within the at least one smaller portion of the capacitor array for the at least one touch location using the capacitive sense circuitry operating in a slow scanning mode of operation; detecting the at least one touch location with the second sensing circuitry within the at least one smaller portion of the capacitor array; and outputting the at least one touch location. - View Dependent Claims (18, 19, 20)
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Specification