Object identification method of touch system

An object identification method of touch system, wherein the touch system having at least one driving electrode and at least one sensing electrode, the object identification method comprising:

• repeating an object measurement to obtain a plurality of object signals;
• conducting a first liquid measurement, and the first liquid measurement comprising:
• driving one or a part of the sensing electrodes to a first voltage;
• and,
• measuring electrical changes of the other sensing electrodes, which are not driven, by an analog-to-digital converter to obtain a first liquid signal;
• determining whether the value of the first liquid signal is greater than a first default value or less than a second default value, wherein the first default value is larger than the second default value;
• proceeding with an elimination step if the value of the first liquid signal is greater than the first default value, wherein the elimination step comprising:
• repeating a second liquid measurement to obtain a plurality of second liquid signals;
• conducting a noise measurement if the second liquid signals are greater than the first default value;
• repeating a third liquid measurement to obtain a plurality of third liquid signals if there is no noise signal obtained by the noise measurement, and determining whether the value of third liquid signals are greater than the first default value;
• and,
• eliminating the object signals if the value of the third liquid signals are greater than the first default value;
• proceeding with a start step if the value of the first liquid signal is less than the second default value, wherein the start step comprising:
• repeating the second liquid measurement to obtain a plurality of the second liquid signals;
• and,
• starting the object measurement to output the object signals if the second liquid signals are less than the second default value.