Touch display device, touch driving circuit and display panel
A touch display device of the present disclosure may include a display panel on which a plurality of touch electrodes are electrically connected to a plurality of touch lines; a gate driving circuit for supplying scan signals to the display panel through a plurality of gate lines; a touch driving circuit for sensing a touch by detecting a touch signal from the plurality of touch electrodes and supplying a common voltage to the touch electrodes through the touch lines; a common voltage feedback line electrically connected to the plurality of touch lines or disposed to overlap with the plurality of gate lines in a non-display area of the display panel; and a common voltage compensation circuit for supplying a compensated common voltage based on a distortion in the common voltage.
1. A touch display device comprising:
a display panel including a plurality of touch electrodes that are electrically connected to a plurality of touch lines disposed within a display area that displays an image, the plurality of touch lines extending in a first direction;
a gate driving circuit configured to supply scan signals to the display panel through a plurality of gate lines extending in a second direction, the second direction different from the first direction;
a touch driving circuit configured to sense a touch by detecting a touch signal from the plurality of touch electrodes during a touch driving period and supply a common voltage to the plurality of touch electrodes through the plurality of touch lines for displaying the image during a display driving period;
a common voltage feedback line disposed in a non-display area of the display panel and electrically connected to the plurality of touch lines or overlapping with the plurality of gate lines in the non-display area of the display panel; and
a common voltage compensation circuit configured to detect a distortion of the common voltage and supply a compensated common voltage that is generated based on the distortion of the common voltage through the plurality of touch lines,
wherein the common voltage feedback line has first and second portions that have different widths from each other and are disposed adjacent to respective edges of the plurality of touch electrodes.
2. The touch display device according to claim 1 , wherein the plurality of touch electrodes are split type touch electrodes, at least two of the plurality of touch electrodes having a same size.
3. The touch display device according to claim 1 , wherein the plurality of touch electrodes are woven type touch electrodes in which a plurality of first touch electrodes with a first length and a plurality of second touch electrodes with a second length in the second direction are alternately arranged in the first direction where the second length is less than the first length, and at least a portion of the plurality of second touch electrodes arranged in the first direction are connected to one touch line from the plurality of touch lines.
4. The touch display device according to claim 1 , wherein the common voltage feedback line electrically connected to the plurality of touch lines is disposed such that the display area is between the common voltage feedback line and the touch driving circuit.
5. The touch display device according to claim 4 , further comprising a noise blocking circuit disposed between the common voltage feedback line and the plurality of touch lines.
6. The touch display device according to claim 5 , wherein the noise blocking circuit includes a resistor and a capacitor, the resistor and the capacitor connected in parallel.
7. The touch display device according to claim 1 , wherein the common voltage feedback line that overlaps the plurality of gate lines is disposed in the first direction such that the display area is between the gate driving circuit and the common voltage feedback line.
8. The touch display device according to claim 1 , wherein the first and second portions of the common voltage feedback line have widths corresponding to respective lengths of two touch electrodes from the plurality of touch electrodes that overlaps with the plurality of gate lines in the second direction.
9. The touch display device according to claim 8 , wherein a ratio of a width at which the common voltage feedback line overlaps with a first gate line from the plurality of gates lines and a width at which the common voltage feedback line overlaps with a second gate line from the plurality of gates lines is equal to a ratio of a length at which the first gate line overlaps with a first touch electrode from the plurality of touch electrodes, and a length at which the second gate line overlaps with a second touch electrode from the plurality of touch electrodes.
10. The touch display device according to claim 1 , wherein the compensated common voltage is a signal that counterbalances the distortion of the common voltage due to a parasitic capacitance caused by overlapping of the scan signals supplied through adjacent gate lines from the plurality of gate lines.
11. The touch display device according to claim 1 , wherein the common voltage compensation circuit includes an operational amplifier, the operational amplifier including an inverting input terminal that receives the common voltage fed back through the common voltage feedback line through a first resistor, and a non-inverting input terminal that receives a reference voltage.
12. A touch driving device comprising:
a plurality of touch lines extending in a direction, the plurality of touch lines configured to transmit touch signals to a display panel that includes a plurality of touch electrodes;
a touch sensing circuit configured to supply touch driving signals to the plurality of touch electrodes through the plurality of touch lines and receive touch sensing signals from the plurality of touch electrodes during a touch driving period, and supply a common voltage to the plurality of touch electrodes through the plurality of touch lines during a display driving period;
a touch controller configured to detect touch presence responsive to the touch sensing signals and calculate touch coordinates according to the touch sensing signals;
a common voltage feedback line electrically connected to the plurality of touch lines or overlapping with the plurality of gate lines; and
a common voltage compensation circuit configured to detect a distortion of the common voltage and supply a compensated common voltage that is generated based on the distortion of the common voltage through the plurality of touch lines,
wherein the common voltage feedback line has first and second portions that have different widths from each other and are disposed adjacent to respective edges of the plurality of touch electrodes.
13. The touch driving device according to claim 12 , wherein the compensated common voltage is a signal that counterbalances a distortion of the common voltage due to a parasitic capacitance caused by overlapping of scan signals supplied through adjacent gate lines from the plurality of gate lines.
14. The touch driving device according to claim 12 , wherein the common voltage compensation circuit includes an operational amplifier, the operational amplifier including an inverting input terminal that receives the common voltage fed back through the common voltage feedback line through a first resistor, and a non-inverting input terminal that receives a reference voltage.
15. A display panel comprising:
a plurality of touch electrodes, each of the plurality of touch electrodes corresponding to a respective plurality of subpixels included in the display panel;
a plurality of touch lines extending in a first direction, the plurality of touch lines configured to transmit touch signals to the plurality of touch electrodes;
a plurality of gate lines extending in a second direction that is different from the first direction, the plurality of gate lines configured to transmit scan signals to the plurality of subpixels; and
a common voltage feedback line electrically connected to the plurality of touch lines or overlapping with the plurality of gate lines in a non-display area of the display panel,
wherein the common voltage feedback line has first and second portions that have different widths from each other and are disposed adjacent to respective edges of the plurality of touch electrodes.
16. The display panel according to claim 15 , wherein the common voltage feedback line electrically connected to the plurality of touch lines is disposed such that a display area is between the common voltage feedback line and a touch driving circuit, the touch driving circuit configured to supply the touch signals to the plurality of touch electrodes via the plurality of touch lines.
17. The display panel according to claim 16 , further comprising a noise blocking circuit disposed between the common voltage feedback line and the plurality of touch lines.
18. The display panel according to claim 17 , wherein the noise blocking circuit includes a resistor and a capacitor, the resistor and the capacitor connected in parallel.
19. The display panel according to claim 15 , wherein the common voltage feedback line that overlaps the plurality of gate lines is disposed in the first direction such that a display area is between the common voltage feedback line and a gate driving circuit that is configured to supply the scan signals.
20. The display panel according to claim 15 , wherein the first and second portions of the common voltage feedback line have widths corresponding to respective lengths of two touch electrodes from the plurality of touch electrodes that overlaps with the plurality of gate lines in the second direction.