Touch driver, touch device, and display device including the same

A touch device comprising:

• a plurality of first touch electrodes extending in a first direction and aligned in a second direction crossing the first direction;
• a plurality of second touch electrodes extending in the second direction and aligned in the first direction;
• and
• a touch driver configured to (i) apply a plurality of first driving signals to the plurality of first touch electrodes, (ii) receive a plurality of first currents from the plurality of second touch electrodes, and (iii) generate first touch data based on a plurality of first output currents that are a sum of (a) a first mean current that is a mean of a plurality of first opposite currents having an opposite direction to the plurality of first currents and (b) a respective first current of the plurality of first currents, the touch driver comprising:
• a plurality of current conveyor circuits connected to a plurality of touch electrodes, the plurality of current conveyor circuits configured to (i) receive a plurality of first currents from the plurality of touch electrodes, and (ii) generate the plurality of first opposite currents, each of the plurality of current conveyor circuits comprising:
• an amplifier circuit configured to receive one of the plurality of first currents and a touch voltage from a receiving terminal connected to a first touch electrode from among the plurality of touch electrodes,
• a current buffer circuit connected to a first output terminal of the amplifier circuit, a second output terminal of the amplifier circuit, and the first touch electrode, and configured to receive an output voltage of the amplifier circuit and one of the plurality of first currents,
• a first current mirror circuit connected to the first output terminal of the amplifier circuit, the second output terminal of the amplifier circuit, and the current buffer circuit, the first current mirror circuit configured to (i) receive the output voltage of the amplifier circuit, and (ii) generate a first mirroring current having a same direction as the plurality of first currents, and
• a second current mirror circuit connected to the first output terminal of the amplifier circuit, the second output terminal of the amplifier circuit, and the current buffer circuit, the second current mirror circuit configured to (i) receive the output voltage of the amplifier circuit, and (ii) generate a second mirroring current having an opposite direction to the plurality of first currents, in which one of the plurality of opposite phase currents includes the second mirroring current.

A display device comprising:

• a first panel comprising a plurality of pixels;
• a second panel on the first panel, the second panel comprising a plurality of touch electrodes;
• and
• a driving circuit configured to (i) provide a plurality of data signals that correspond to a plurality of pixels to the plurality of pixels of the first panel, (ii) receive a plurality of first currents from the plurality of touch electrodes, (iii) subtract a mean current of the plurality of first currents from the plurality of first currents, and (iv) generate a plurality of touch data based on the subtracted currents, the driving circuit comprising:
• a plurality of current conveyor circuits connected to the plurality of touch electrodes, the plurality of current conveyor circuits configured to (i) receive a plurality of first currents from the plurality of touch electrodes, and (ii) generate the plurality of first opposite currents, each of the plurality of current conveyor circuits comprising:
• an amplifier circuit configured to receive one of the plurality of first currents and a touch voltage from a receiving terminal connected to a first touch electrode from among the plurality of touch electrodes,
• a current buffer circuit connected to a first output terminal of the amplifier circuit, a second output terminal of the amplifier circuit, and the first touch electrode, and configured to receive an output voltage of the amplifier circuit and one of the plurality of first currents,
• a first current mirror circuit connected to the first output terminal of the amplifier circuit, the second output terminal of the amplifier circuit, and the current buffer circuit, the first current mirror circuit configured to (i) receive the output voltage of the amplifier circuit, and (ii) generate a first mirroring current having a same direction as the plurality of first currents, and
• a second current mirror circuit connected to the first output terminal of the amplifier circuit, the second output terminal of the amplifier circuit, and the current buffer circuit, the second current mirror circuit configured to (i) receive the output voltage of the amplifier circuit, and (ii) generate a second mirroring current having an opposite direction to the plurality of first currents, in which one of the plurality of opposite phase currents includes the second mirroring current.