Touch-input detection device, touch-screen having the same, and method of detecting a touch-input

A touch screen comprising:

• a display device;
• and
• a touch input detection device configured to detect a touch input, comprising:
• a touch panel having first sensing electrodes and second sensing electrodes;
• a sensing signal driver configured to generate a sensing signal and apply the sensing signal to a charge pump unit and the first sensing electrodes;
• the charge pump unit configured to generate an output voltage based on the sensing signal and an output signal from the second sensing electrodes;
• and
• a control unit configured to determine whether or not a touch input has been made on the touch panel based on the output voltage.

A method of detecting a touch-input comprising:

• applying a sensing signal to first sensing electrodes in a touch panel;
• outputting an output signal from second sensing electrodes to a touch sensing unit, the first sensing electrodes and the second sensing electrodes forming a plurality of capacitive nodes in the touch panel;
• generating an output voltage based on a stored charge in a capacitor, the stored charge resulting from a first current generated based on the sensing signal and a second current generated based the output signal;
• and
• determining whether or not a touch input has been made on the touch panel based on the output voltage.