Touch sensor embedded display device and method for driving the same
Provided are a touch sensor embedded display device and a method for driving the same. A method includes: sequentially, in the display period: performing a display scan of a first area of the display panel based on one display line; and applying data of an input image to the pixels of the first area; simultaneously performing: a touch scan of a first touch line of the display panel and a touch scan of a second touch line of the display panel in a touch period following the display period; and simultaneously sensing touch inputs of the touch sensors on the first and second touch lines in the touch period, wherein each of the first and second touch lines overlaps a plurality of display lines, and wherein a width of each of the first and second touch lines is greater than a width of each of the plurality of display lines.
1. A touch sensor embedded display device, comprising:
a display panel comprising pixels and touch sensors;
a display driver configured to sequentially:
perform a display scan of a first area of the display panel based on one display line in a display period; and
apply data of an input image to the pixels of the first area in the display period; and
a touch sensor driver configured to:
perform a touch scan of a first touch line of the display panel and a touch scan of a second touch line of the display panel, simultaneously, in a touch period following the display period, a same scan driving signal being applied to both the first touch line and the second touch line of the display panel for an entire touch scan period; and
sense touch inputs of the touch sensors on the first and second touch lines, simultaneously, in the touch period,
wherein each of the first and second touch lines overlaps a plurality of display lines, and
wherein a width of each of the first and second touch lines is greater than a width of each of the plurality of display lines.
2. The touch sensor embedded display device of claim 1 , wherein:
the display panel comprises an upper display surface and a lower display surface;
the first touch line is on the upper display surface; and
the second touch line is on the lower display surface.
3. The touch sensor embedded display device of claim 2 , wherein an extension line of a display scan direction and an extension line of a touch scan direction cross each other in one frame period.
4. The touch sensor embedded display device of claim 3 , wherein a time separation between the first touch line and the second touch line changes in the one frame period.
5. The touch sensor embedded display device of claim 4 , wherein, when the one frame period comprises a first subframe and a second subframe which are successively arranged, the time separation has:
a maximum value at a start time point of each of the first subframe and the second subframe; and
a minimum value at an end time point of each of the first subframe and the second subframe.
6. The touch sensor embedded display device of claim 5 , wherein the first area and the first touch line overlap each other in the first subframe.
7. The touch sensor embedded display device of claim 4 , wherein, when the one frame period comprises a first subframe and a second subframe which are successively arranged, the time separation has:
a minimum value at a start time point of each of the first subframe and the second subframe; and
a maximum value at an end time point of each of the first subframe and the second subframe.
8. The touch sensor embedded display device of claim 7 , wherein the first area and the second touch line overlap each other in the second subframe.
9. The touch sensor embedded display device of claim 2 , wherein an extension line of a display scan direction and an extension line of a touch scan direction are at a same time separation to each other during one frame period.
10. The touch sensor embedded display device of claim 9 , wherein the first area does not overlap the first touch line and the second touch line in the one frame period.
11. The touch sensor embedded display device of claim 10 , wherein:
a first time separation between operation of a first display line and operation of the first touch line, a second time separation between operation of the first display line and operation of the second touch line, and a third time separation between operation of the first touch line and operation of the second touch line are held constant in the one frame period; and
the display scan for the first area is performed on the first display line.
12. The touch sensor embedded display device of claim 11 , wherein the first time separation and the second time separation are the same as each other at one half of the one frame period.
13. The touch sensor embedded display device of claim 11 , wherein the first time separation and the second time separation are different from each other at one half of the one frame period.
14. The touch sensor embedded display device of claim 1 , wherein the touch period comprises:
a free driving period, in which a touch driving signal is applied prior to a touch sensing; and
an effective sensing period, in which a touch input is sensed based on the touch driving signal.
15. The touch sensor embedded display device of claim 1 , wherein, during the touch period, the display driver is further configured to:
supply a first AC signal having a same phase and the same amplitude as a touch driving signal to data lines connected to the pixels; and
supply a second AC signal having the same phase and the same amplitude as the touch driving signal to gate lines connected to the pixels.
16. A method for driving a touch sensor embedded display device comprising a display panel comprising pixels and touch sensors, the method comprising:
sequentially:
performing a display scan of a first area of the display panel based on one display line in a display period; and
applying data of an input image to the pixels of the first area in the display period;
performing a touch scan of a first touch line of the display panel and a touch scan of a second touch line of the display panel, simultaneously, in a touch period following the display period, a same scan driving signal being applied to both the first touch line and the second touch line of the display panel for an entire touch scan period; and
sensing touch inputs of the touch sensors on the first and second touch lines, simultaneously, in the touch period,
wherein each of the first and second touch lines overlaps a plurality of display lines, and
wherein a width of each of the first and second touch lines is greater than a width of each of the plurality of display lines.
17. The method of claim 16 , wherein:
the display panel comprises an upper display surface and a lower display surface;
the first touch line is on the upper display surface; and
the second touch line is on the lower display surface.
18. The method of claim 17 , wherein an extension line of a display scan direction and an extension line of a touch scan direction cross each other in one frame period.
19. The method of claim 18 , wherein a time separation between the first touch line and the second touch line changes in the one frame period.
20. The method of claim 19 , wherein, when the one frame period comprises a first subframe and a second subframe which are successively arranged, the time separation has:
a maximum value at a start time point of each of the first subframe and the second subframe; and
a minimum value at an end time point of each of the first subframe and the second subframe.
21. The method of claim 20 , wherein the first area and the first touch line overlap each other in the first subframe.
22. The method of claim 19 , wherein, when the one frame period comprises a first subframe and a second subframe which are successively arranged, the time separation has:
a minimum value at a start time point of each of the first subframe and the second subframe; and
a maximum value at an end time point of each of the first subframe and the second subframe.
23. The method of claim 22 , wherein the first area and the second touch line overlap each other in the second subframe.
24. The method of claim 17 , wherein an extension line of a display scan direction and an extension line of a first touch scan direction and an extension line of a second touch scan direction are at a same time separation to each other during one frame period.
25. The method of claim 24 , wherein the first area does not overlap the first touch line and the second touch line in the one frame period.
26. The method of claim 25 , wherein:
a first time separation between operation of a first display line and operation of the first touch line, a second time separation between operation of the first display line and operation of the second touch line, and a third time separation between operation of the first touch line and operation of the second touch line are held constant in the one frame period; and
the display scan for the first area is performed on the first display line.
27. The method of claim 26 , wherein the first time separation and the second time separation are the same as each other at one half of the one frame period.
28. The method of claim 26 , wherein the first time separation and the second time separation are different from each other at one half of the one frame period.
29. The method of claim 16 , wherein the touch period comprises:
a free driving period, in which a touch driving signal is applied prior to a touch sensing; and
an effective sensing period, in which a touch input is sensed based on the touch driving signal.
30. The method of claim 16 , further comprising:
supplying a first AC signal having the same phase and the same amplitude as a touch driving signal to data lines connected to the pixels during the touch period; and
supplying a second AC signal having the same phase and the same amplitude as the touch driving signal to gate lines connected to the pixels during the touch period.