Touchscreen Display Device, Touch Driving Circuit, and Driving Method

A touchscreen display device comprising:

• a display panel including a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch lines;
• a gate driving circuit configured to sequentially output gate signals to the plurality of gate lines;
• a data driving circuit configured to output data signals, converted from digital image signals in response to a gamma reference voltage, to the plurality of data lines;
• a touch driving circuit configured to output a touch electrode driving signal to at least one touch electrode among the plurality of touch electrodes;
• a first power circuit configured to supply the touch electrode driving signal to the touch driving circuit;
• a second power circuit configured to supply the gamma reference voltage, signal characteristics of which correspond to those of the touch electrode driving signal, to the data driving circuit;
• and
• a delay resistor configured to be disposed on a path through which the touch electrode driving signal is transferred from the first power circuit to the display panel through the touch driving circuit.

A touchscreen display device comprising:

• a display panel including a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch lines;
• a gate driving circuit configured to sequentially output gate signals to the plurality of gate lines;
• a data driving circuit configured to output data signals, converted from digital image signals in response to a plurality of gamma reference voltages, to the plurality of data lines;
• a touch driving circuit configured to output a touch electrode driving signal to at least one touch electrode among the plurality of touch electrodes;
• a first power circuit configured to supply the touch electrode driving signal to the touch driving circuit;
• a second power circuit configured to supply the plurality of gamma reference voltages, signal characteristics of which correspond to those of the touch electrode driving signal, to the data driving circuit;
• and
• rapid resistors configured to be disposed on a circuit generating one or more gamma reference voltages among the plurality of gamma reference voltages or disposed on a path through which one or more gamma reference voltages among the plurality of gamma reference voltages are transferred.

A method of driving a touchscreen display device including a display panel including a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch lines, the method comprising:

• differentially sensing, by a touch driving circuit in the touchscreen display device, two touch electrodes selected from among the plurality of touch electrodes;
• and
• detecting a touch according to a result of the differential sensing,
• wherein the plurality of touch electrodes include n number of touch electrodes disposed in order, a first touch electrode among the n number of touch electrodes being disposed farthest from the touch driving circuit, and an nth touch electrode among the n number of touch electrodes being disposed closest to the touch driving circuit, wherein n is an integer greater than or equal to 3, and
• wherein, in the differential sensing, the touch driving circuit differentially senses a third touch electrode selected as a sensing touch electrode from among the n number of touch electrodes and a second touch electrode selected as a reference touch electrode from among the n number of touch electrodes, and differentially senses the first touch electrode selected as a sensing touch electrode from among the n number of touch electrodes and the nth touch electrode selected as a reference touch electrode from among the n number of touch electrodes.

A touch driving circuit of a touchscreen display device including a display panel including a plurality of data lines, a plurality of gate lines, a plurality of touch electrodes, and a plurality of touch lines, the touch driving circuit comprises:

• a differential amplifier configured to differentially sense two touch electrodes selected from among the plurality of touch electrodes;
• and
• an analog-to-digital converter configured to output a sensing value in accordance with an output signal of the differential amplifier,
• wherein the touch driving circuit is located on one side of the display panel,
• the plurality of touch electrodes include n number of touch electrodes disposed in order, wherein n is an integer greater than or equal to 3,
• a first touch electrode among the n number of touch electrodes is disposed farthest from the touch driving circuit, and an nth touch electrode among the n number of touch electrodes being disposed closest to the touch driving circuit, and
• the differential amplifier is configured to differentially sense a third touch electrode selected as a sensing touch electrode from among the n number of touch electrodes and a second touch electrode selected as a reference touch electrode from among the n number of touch electrodes, and is configured to differentially sense the first touch electrode selected as a sensing touch electrode from among the n number of touch electrodes and the nth touch electrode selected as a reference touch electrode from among the n number of touch electrodes.