TOUCH SENSING DEVICE AND CONTROL METHOD THEREOF

摘要

PURPOSE: A touch sensing device and a control method thereof are provided to improve a touch sensing performance, reduce a touch sensing error due to a circumstance variation, and improve an offset compensation performance. CONSTITUTION: A touch panel unit (110) includes sensing nodes and senses mutual capacitance values of the sensing nodes. A signal process unit (121) generates touch data according to the mutual capacitance values. A control unit (122) corrects the touch data based on node deviations among the sensing nodes and determines one of the corrected data as a reference value for judging a touch state of the sensing nodes. A storage unit (123) stores the node deviations and the reference value. The control unit calculates a difference between the reference value and the corrected data by subtraction, and calculates touch coordinates of the touch panel unit by comparing the difference with a comparison value.