Patent ID: 8884885
Filing Date: 2014-11-11
Classification: G06F

Abstract:
1. A touch pad, comprising: a sensing electrode array unit including a plurality of electrodes which are arranged to form an array, wherein the sensing electrode array unit is configured to detect initial values of the electrodes in the array while the user does not operate the touch pad, and detect first values of the electrodes whose physical characteristic changes while the user touches the touch pad with an input tool and moves the input tool on the touch pad; a storage unit configured to store a graphical password defined by coordinate values corresponding to positions of part of the electrodes; and a processing unit connected to the sensing electrode array unit and the storage unit, and configured to compare the initial values with the first values to generate first comparison values, determine, based on the first comparison values, coordinate values corresponding to positions of the electrodes which are touched by the user while the user moves the input tool on the touch pad and whose physical characteristic changes, record the coordinate values corresponding to the positions of the electrodes touched by the user generate a trace graph defined by the recorded coordinate values, compare the coordinate values of the trace graph with those of the graphical password to generate a second comparison value, and determine whether the touch pad can be operated by the user on the basis of the second comparison value.