Touch sensor and touch sensitive display including the same

A touch sensor comprising:

• a touch panel comprising driving lines, sensing lines, and a node capacitor formed between a driving line and a sensing line adjacent to each other;
• a driver for supplying a driving signal to each of the driving lines;
• and
• a sensor electrically connected to the sensing lines, for detecting capacitance of the node capacitor,
• wherein the sensor comprises sensing circuits, each of which senses a signal received from corresponding one of the sensing lines,
• wherein each of the sensing circuits comprises:
• a first amplifier comprising a first input terminal connected to the sensing line, a second input terminal, and an output terminal, the first input terminal being connected to the corresponding sensing line;
• a feedback capacitor connected between the output terminal and the first input terminal of the first amplifier;
• a feedback resistor connected between the output terminal and the first input terminal of the first amplifier and connected in parallel to the feedback capacitor;
• and
• an inverting amplifier for invert-amplifying an output signal of the output terminal of the first amplifier and supplying the invert-amplified output signal to the second input terminal of the first amplifier,
• wherein the inverting amplifier includes:
• a second amplifier including a first input terminal, a second input terminal connected to a ground source, and an output terminal directly connected to the second input terminal of the first amplifier;
• a first resistor connected between the output terminal of the first amplifier and the first input terminal of the second amplifier;
• and
• a second resistor connected between the first input terminal of the second amplifier and the output terminal of the second amplifier.

A touch sensitive display comprising:

• a display coupled to a touch panel;
• the touch panel, comprising driving lines, sensing lines, and a node capacitor formed between a driving line and a sensing line adjacent to each other;
• a driver for supplying a driving signal to each of the driving lines;
• and a sensor electrically connected to the sensing lines, for detecting capacitance of a node capacitor between a driving line with the driving signal supplied thereto and a sensing line corresponding to the driving line,
• a sensor electrically connected to the sensing lines, for detecting capacitance of the node capacitor between a driving line with the driving signal supplied thereto and a sensing line corresponding to the driving line,
• wherein the sensor comprises:
• a first amplifier comprising a first input terminal connected to the sensing line, a second input terminal, and an output terminal, the first input terminal being connected to the corresponding sensing line;
• a feedback capacitor connected between the output terminal and the first input terminal of the first amplifier;
• and
• an inverting amplifier for invert-amplifying an output signal of the output terminal of the first amplifier and supplying the invert-amplified output signal to the second input terminal of the first amplifier,
• wherein the inverting amplifier comprises:
• a second amplifier including a first input terminal, a second input terminal, and an output terminal directly connected to the second input terminal of the first amplifier;
• a first resistor connected between the output terminal of the first amplifier and the first input terminal of the second amplifier;
• and
• a second resistor connected between the first input terminal of the second amplifier and the output terminal of the second amplifier.