APPARATUS AND METHOD FOR SENSING CAPACITANCE, AND TOUCH SCREEN APPARATUS
First Claim
1. An apparatus for sensing capacitance, the apparatus comprising;
- a driving circuit unit applying driving signals to a first capacitor;
an integration circuit unit including a second capacitor and a third capacitor respectively charged by a change in capacitance generated in the first capacitor based on the driving signals to generate a predetermined output voltage and calculating a voltage difference between the output voltage of the second capacitor and the output voltage of the third capacitor; and
a control unit determining characteristics of a noise signal based on the voltage difference and controlling the driving signals based on the characteristics of the noise signal.
2 Assignments
0 Petitions
Accused Products
Abstract
There are provided an apparatus for sensing capacitance, a method for sensing capacitance, and a touch screen apparatus. The apparatus for sensing capacitance includes; a driving circuit unit applying driving signals to a first capacitor; an integration circuit unit including a second capacitor and a third capacitor respectively charged by a change in capacitance generated in the first capacitor based on the driving signals to generate a predetermined output voltage and calculating a voltage difference between the output voltage of the second capacitor and the output voltage of the third capacitor; and a control unit determining characteristics of a noise signal based on the voltage difference and controlling the driving signals based on the characteristics of the noise signal.
15 Citations
17 Claims
-
1. An apparatus for sensing capacitance, the apparatus comprising;
-
a driving circuit unit applying driving signals to a first capacitor; an integration circuit unit including a second capacitor and a third capacitor respectively charged by a change in capacitance generated in the first capacitor based on the driving signals to generate a predetermined output voltage and calculating a voltage difference between the output voltage of the second capacitor and the output voltage of the third capacitor; and a control unit determining characteristics of a noise signal based on the voltage difference and controlling the driving signals based on the characteristics of the noise signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for sensing capacitance, the method comprising:
-
applying driving signals to a first capacitor; generating a first output voltage and a second output voltage from the first capacitor by charging each of a second capacitor and a third capacitor; calculating a voltage difference between the first output voltage and the second output voltage; determining characteristics of a noise signal from the voltage difference; and controlling the driving signals applied to the first capacitor. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A touch screen apparatus, comprising:
-
a panel unit including a plurality of node capacitors respectively defined at intersecting points between a plurality of first electrodes and a plurality of second electrodes; a driving circuit unit applying driving signals to the node capacitors; a sensing circuit unit including a first capacitor and a second capacitor, respectively charged by a change in capacitance generated in the capacitors based on the driving signals to generate a predetermined output voltage and calculating a voltage difference between the output voltage of the first capacitor and the output voltage of the second capacitor; and a control unit determining characteristics of a noise signal based on the voltage difference and controlling the driving signals based on the characteristics of the noise signal. - View Dependent Claims (16, 17)
-
Specification