Patent ID: 9417741
Filing Date: 2016-08-16
CPC Classification: G06F

Claim Text:
1. A capacitance sensing apparatus comprising: a driving circuit device configured to apply a driving signal of a predetermined first period to a node capacitor; a first integrating circuit device configured to integrate a voltage charged in the node capacitor, to generate an output voltage; a buffer capacitor configured to be charged or discharged by the output voltage of the first integrating circuit device; a second integrating circuit device configured to integrate a voltage charged in the buffer capacitor, to generate a non-inverted output voltage, and to generate an inverted output voltage; and an amplifying device including a plurality of amplifying circuits configured to differentially amplify the non-inverted output voltage and the inverted output voltage generated by the second integrating circuit device, wherein in a reset section of the second integrating circuit device, the plurality of amplifying circuits are configured to respectively amplify voltages corresponding to a positive offset and a negative offset, to generate offset information for determining touch inputs.