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 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 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 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.