METHOD OF REDUCING COMPUTATION OF PALM REJECTION BY PROJECTING TOUCH DATA
First Claim
1. A method of reducing computation of palm rejection by projecting touch data, the method comprising steps of:
- obtaining capacitance raw data of a sensing array having row sensing lines and column sensing lines;
comparing the capacitance raw data with reference raw data to obtain a difference array;
obtaining a row projection list by extracting maximum values of rows the difference array; and
obtaining a column project list by extracting maximum values of columns of the difference array.
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Abstract
A method of reducing computation of palm rejection by projecting touch data is disclosed, targeting the handheld devices. The method targets first at obtaining a difference array, followed by extracting maximum values of rows and columns of the difference array to obtain a row projection list and a column projection list respectively. By repeated implementing of mutual capacitance detection, ghost palm blocks can be wiped out from the multiple palm blocks. Once integrating with a local spatial boundary detection algorithm, the sensed signals of intended input located within a rectangular palm block yet beyond a real palm block are consequently detected. The computational algorithm of the palm rejection of this invention is successfully built into the touch panel controller due to its substantially reduced computation.
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13 Claims
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1. A method of reducing computation of palm rejection by projecting touch data, the method comprising steps of:
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obtaining capacitance raw data of a sensing array having row sensing lines and column sensing lines; comparing the capacitance raw data with reference raw data to obtain a difference array; obtaining a row projection list by extracting maximum values of rows the difference array; and obtaining a column project list by extracting maximum values of columns of the difference array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification