Method of reducing computation of water tolerance by projecting touch data

摘要

A method of reducing computation of water tolerance by projecting touch data is disclosed, targeting the handheld devices. The method targets first at obtaining a difference array, followed by extracting minimum 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 water blocks can be wiped out from the multiple water blocks. Once integrating with a local spatial boundary detection algorithm, the sensed signals of intended input located within a rectangular water block yet beyond a real water block are consequently detected. The computational algorithm of the water tolerance of this invention is successfully built into the touch panel controller due to its substantially reduced computation.

主权项

1. A method of reducing computation of water tolerance 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 minimum values of rows the difference array; and obtaining a column project list by extracting minimum values of columns of the difference array; determining at least one rectangular water block by the row projection list and the column projection list; preventing dynamic calibration on the at least one rectangular water block; wherein the step of determining at least one rectangular water block by the row projection list and the column projection list is to compare the row projection list with a first water threshold and compare the column projection list with a second water threshold respectively to form a row water mask and a column water mask to determine an extent of the at least one rectangular water block, and wherein if a number of adjoined row sensing lines in the at least one rectangular water block is greater than a row-threshold and a number of adjoined column sensing lines in the at least one rectangular water block is greater than a column-threshold, sensed signals generated in the at least one rectangular water block are filtered out or neglected.