Touch sensing apparatus and touchscreen apparatus including the same

摘要

A touch sensing apparatus may include a driving signal generating circuit including a first switch and a second switch and providing driving signals to a first node of a node capacitor, the driving signals being generated by switching operations of the first switch and the second switch, and a C-V converting circuit including a buffer circuit having a first feedback capacitor and a third switch disposed between a second node of the node capacitor and the first feedback capacitor and transferring a charging voltage of the node capacitor to the first feedback capacitor through a switching operation of the third switch to generate an output voltage. The buffer circuit further includes a fourth switch disposed between the second node of the node capacitor and a current source, and the fourth switch is turned on in an off operation section of the third switch.

主权项

1. A touch sensing apparatus comprising:
a driving signal generating circuit comprising a first switch and a second switch and providing driving signals to a first node of a node capacitor, the driving signals being generated by switching operations of the first switch and the second switch; and a C-V converting circuit comprising a buffer circuit including a first feedback capacitor and a third switch disposed between a second node of the node capacitor and the first feedback capacitor and transferring a charging voltage to the first feedback capacitor from the node capacitor through a switching operation of the third switch to generate an output voltage, wherein the buffer circuit further comprises a fourth switch disposed between the second node of the node capacitor and a current source and the fourth switch is turned on in an off operation section of the third switch, and wherein an on operation section of the fourth switch is determined according to capacitance of the node capacitor and the first feedback capacitor.