Display device
A display device is disclosed that includes a sensor area including a plurality of channels each including touch electrodes arranged in a column, a peripheral area located around the sensor area and including touch lines connected to the channels, and a display driver configured to supply touch driving signals to the channels. The sensor area includes a first sensor area located at a first edge of the sensor area, and a second sensor area located adjacent to the first sensor area. The display driver supplies first touch driving signals having a first voltage level to the channels in the first sensor area during a first period, and supplies second touch driving signals having a second voltage level to the channels in the second sensor area during a second period after the first period, the second voltage level being lower than the first voltage level. The display driver supplies the first touch driving signals sequentially to the channels in the first sensor area according to a single-channel driving scheme during the first period, and supplies the second touch driving signals simultaneously to the channels in the second sensor area according to a multi-channel driving scheme during the second period.
1. A display device comprising:
a sensor area comprising a plurality of channels each comprising touch electrodes arranged in a column;
a peripheral area located around the sensor area and comprising touch lines connected to the channels; and
a display driver configured to supply touch driving signals to the channels,
wherein the sensor area comprises a first sensor area located at a first edge of the sensor area, and a second sensor area located adjacent to the first sensor area,
wherein the display driver supplies first touch driving signals having a first voltage level to the channels in the first sensor area during a first period, and supplies second touch driving signals having a second voltage level to the channels in the second sensor area during a second period after the first period, the second voltage level being lower than the first voltage level, and
wherein the display driver supplies the first touch driving signals sequentially to the channels in the first sensor area according to a single-channel driving scheme during the first period, and supplies the second touch driving signals simultaneously to the channels in the second sensor area according to a multi-channel driving scheme during the second period.
2. The display device of claim 1 , wherein the sensor area has a circular or oval shape in a plan view.
3. The display device of claim 1 , wherein the sensor area further comprises a third sensor area at a second edge of the sensor area, and
wherein the display driver supplies third touch driving signals having the first voltage level to the channels in the third sensor area according to the single-channel driving scheme during a third period after the second period.
4. The display device of claim 1 , wherein a pulse width of each of the touch driving signals supplied during the first period is smaller than a pulse width of each of the touch driving signals supplied during the second period.
5. The display device of claim 1 , wherein a size of some of the touch electrodes disposed in the first sensor area is smaller than a size of some of the touch electrodes disposed in the second sensor area.
6. The display device of claim 1 , further comprising:
a voltage level output unit configured to determine the first voltage level or the second voltage level of the touch driving signals,
wherein the voltage level output unit comprises:
first and second charge pumps each comprising at least one capacitor;
a plurality of amplifiers associated with the plurality of channels, respectively;
a first switch disposed between the first and second charge pumps;
a second switch disposed between the second charge pump and the plurality of amplifiers; and
a third switch disposed between the first charge pump and the plurality of amplifiers.
7. The display device of claim 6 , wherein the voltage level output unit outputs an output voltage of the first voltage level by connecting the first and second charge pumps in series by turning on the first and second switches.
8. The display device of claim 6 , wherein the voltage level output unit outputs an output voltage of the second voltage level by connecting the first and second charge pumps in parallel by turning on the second and third switches.
9. The display device of claim 1 , wherein the touch electrodes comprise a plurality of driving electrodes electrically connected in a first direction in the sensor area, and a plurality of sensing electrodes electrically connected in a second direction crossing the first direction in the sensor area, and
wherein the display driver supplies the touch driving signals to the plurality of driving electrodes and receives touch sensing signals from the plurality of sensing electrodes during a mutual capacitance period.
10. The display device of claim 9 , wherein the display driver supplies the touch driving signals to the plurality of driving electrodes and receives the touch sensing signals from the plurality of driving electrodes during a first self-capacitance period after the mutual capacitance period.
11. The display device of claim 10 , wherein the display driver supplies the touch driving signals to the plurality of sensing electrodes and receives the touch sensing signals from the plurality of sensing electrodes during a second self-capacitance period after the first self-capacitance period.
12. A display device comprising:
a sensor area comprising a plurality of channels each comprising touch electrodes arranged in a column, and a hole surrounded by some of the channels;
a peripheral area located around the sensor area and comprising touch lines connected to the channels; and
a display driver configured to supply touch driving signals to the channels,
wherein the display driver supplies first touch driving signals having a first voltage level to first channels that are directly adjacent to the hole during a first period, and supplies second touch driving signals having a second voltage level to second channels that are not adjacent to the hole during a second period after the first period, the second voltage level being lower than the first voltage level, and
wherein the display driver supplies the first touch driving signals sequentially to the first channels according to a single-channel driving scheme during the first period, and supplies the second touch driving signals simultaneously to the second channels according to a multi-channel driving scheme during the second period.
13. The display device of claim 12 , wherein a pulse width of each of the first touch driving signals supplied during the first period is smaller than a pulse width of each of the second touch driving signals supplied during the second period.
14. The display device of claim 12 , wherein a size of the touch electrodes directly adjacent to the hole is smaller than a size of the touch electrodes not adjacent to the hole.
15. The display device of claim 12 , further comprising:
a voltage level output unit configured to determine the first voltage level or the second voltage level of the touch driving signals,
wherein the voltage level output unit comprises:
first and second charge pumps each comprising at least one capacitor;
a plurality of amplifiers associated with the plurality of channels, respectively;
a first switch disposed between the first and second charge pumps;
a second switch disposed between the second charge pump and the plurality of amplifiers; and
a third switch disposed between the first charge pump and the plurality of amplifiers.
16. The display device of claim 15 , wherein the voltage level output unit outputs an output voltage of the first voltage level by connecting the first and second charge pumps in series in case that the first and second switches are turned on.
17. The display device of claim 15 , wherein the voltage level output unit outputs an output voltage of the second voltage level by connecting the first and second charge pumps in parallel in case that the second and third switches are turned on.
18. The display device of claim 12 , wherein the touch electrodes comprise a plurality of driving electrodes electrically connected in a first direction in the sensor area, and a plurality of sensing electrodes electrically connected in a second direction crossing the first direction in the sensor area, and
wherein the display driver supplies the touch driving signals to the plurality of driving electrodes and receives touch sensing signals from the plurality of sensing electrodes during a mutual capacitance period.
19. The display device of claim 18 , wherein the display driver supplies the touch driving signals to the plurality of driving electrodes and receives the touch sensing signals from the plurality of driving electrodes during a first self-capacitance period after the mutual capacitance period.
20. The display device of claim 19 , wherein the display driver supplies the touch driving signals to the plurality of sensing electrodes and receives the touch sensing signals from the plurality of sensing electrodes during a second self-capacitance period after the first self-capacitance period.