Method of identifying palm area of a touch panel and a updating method thereof

A method for updating a palm area for a touch panel, the method comprising the steps of:

• receiving first sensing frame information including multiple first touching sensing points at a first time, and identifying a reference palm area from the first sensing frame information by a palm area identifying procedure, wherein the palm area identifying procedure further comprises the steps of:
• selecting one of the first touching sensing points;
• outwardly extending a distance from an outline of the presently selected first touching sensing point to form a searching range;
• checking whether an outline of any one of other first touching sensing points overlaps the searching range;
• if so, marking the presently selected first touching sensing point ,and selecting another one of the first touching sensing points to return to the step of extending the distance;
• if not, selecting another one of the first touching sensing points to return to the step of extending the distance;
• and
• merging all outlines of the marked first touching sensing points together to form a final outline as the reference palm area;
• receiving second sensing frame information at a second time;
• predicting a palm area of the second sensing frame information by a dynamic position prediction procedure based on the reference palm area of the first sensing frame information;
• determining whether a second touching sensing point of the second sensing frame information is in the predicted palm area;
• and
• updating the reference palm area if the second touching sensing point of the second sensing frame information is at the predicted palm area.