Method for identifying touch object

摘要

A method for identifying touch object on a touch panel has steps of (A) reading m capacitance variations on a first direction, wherein the m capacitance variations respectively correspond to m sensed units of the touch panel; (B) determining whether a difference between the capacitance variation of a kth sensed unit and that of another sensed unit exceeds a preset noise ripple, wherein k is equal to or smaller than m, m is a positive integer; (C) determining whether the capacitance variation of the kth sensed unit exceeds those of the adjacent sensed units; and (D) determining a touch stylus touched on the touch panel when the difference exceeds the preset noise ripple and the capacitance variation of the kth sensed unit exceeds those of the adjacent sensed units. Accordingly, the method can correctly identify a range touched by a stylus from the sensed signals combined with LCM noise signals.

主权项

1. A method for identifying touch object on to a touch panel, the method comprising:
(A) reading m capacitance variation values on a first direction, wherein the m capacitance variation values respectively correspond to m sensed units of the touch panel; (B) determining whether a difference value between the capacitance variation value of a kth sensed unit and that of another sensed unit is larger than a preset noise ripple value, wherein k is equal to or smaller than m and m is a positive integer; (C) determining whether the capacitance variation value of the kth sensed unit is larger than those of the adjacent sensed units; and (D) determining a touch stylus touched on the touch panel when the difference value is larger than the preset noise ripple value and the capacitance variation value of the kth sensed unit is larger than those of the adjacent sensed units.