Touch sensing unit and display device including the same
A touch sensing unit includes a base substrate and a plurality of sensing units disposed on the base substrate. A plurality of scan lines extend along a first direction and are arranged along a second direction that intersects the first direction. A plurality of output lines extend along the second direction and are arranged along the first direction. A first transmission line and a second transmission line are connected to the plurality of sensing units. The first transmission line receives a first transmission voltage. The second transmission line receives a second transmission voltage different from the first transmission voltage.
1. A touch sensing unit comprising:
a base substrate;
a plurality of sensing units disposed on the base substrate;
a plurality of scan lines extending along a first direction and arranged along a second direction that intersects the first direction;
a plurality of output lines extending along the second direction and arranged along the first direction;
a first transmission line and a second transmission line connected to the plurality of sensing units; and
a dual-output power supply having a first output connected to the first transmission line and a second output connected to the second transmission line, wherein:
the first transmission line is configured to receive a first non-zero transmission voltage and the second transmission line is configured to simultaneously receive a second non-zero transmission voltage different from the first non-zero transmission voltage,
each of the first transmission voltage and the second transmission voltage has a different value depending on a position of a sensing unit of the plurality of sensing units, and
at least one of the plurality of scan lines is connected to at least a first one of the plurality of sensing units connected to the first transmission line and to at least a second one of the plurality of sensing units connected to the second transmission line, said first and second sensing units being configured to be read simultaneously.
2. The touch sensing unit of claim 1 , wherein the base substrate comprises a first area and a second area adjacent to the first area along the first direction, and
at least one of the plurality of sensing units is disposed in each of the first area, and the second area.
3. The touch sensing unit of claim 2 , wherein the base substrate comprises a third area adjacent to the first area along the second direction, and
at least one of the plurality of sensing units is disposed in the third area.
4. The touch sensing unit of claim 3 , wherein the sensing unit disposed in the first area and the sensing unit disposed in the third area are connected to the first transmission line and receive the first transmission voltage.
5. The touch sensing unit of claim 4 , wherein the first transmission voltage applied to the sensing unit disposed in the first area has a value different from a value of the second transmission voltage applied to the sensing unit disposed in the second area.
6. The touch sensing unit of claim 4 , wherein the plurality of scan lines receive a scan signal sequentially along the second direction, and
the first transmission voltage that is applied to the sensing unit disposed in the first area when the scan signal is applied to the sensing unit disposed in the first area has a value different from a value of the first transmission voltage that is applied to the sensing unit disposed in the second area when the scan signal is applied to the sensing unit disposed in the third area.
7. The touch sensing unit of claim 2 , wherein the sensing unit disposed in the first area is connected to the first transmission line and receives the first transmission voltage, and
the sensing unit disposed in the second area is connected to the second transmission line and receives the second transmission voltage.
8. The touch sensing unit of claim 1 , further comprising:
a dummy scan line disposed adjacent to the second plurality of scan lines and extending along the first direction;
a dummy output line disposed adjacent to the third plurality of output lines and extending along the second direction; and
a dummy sensing unit connected to the dummy scan line and the dummy output line.
9. The touch sensing unit of claim 8 , wherein the dummy sensing unit detects a driving current that varies depending on driving time, light or temperature.
10. The touch sensing unit of claim 1 , wherein each of the plurality of sensing units comprises a thin film transistor.
11. A display device comprising:
a display unit; and
a touch sensing unit disposed on the display unit,
wherein the touch sensing unit comprises:
a base substrate;
a plurality of sensing units disposed on the base substrate;
a plurality of scan lines extending along a first direction and arranged along a second direction that intersects the first direction;
a plurality of output lines extending along the second direction and arranged along the first direction;
a first transmission line and a second transmission line connected to the plurality of sensing units; and
a dual-output power supply having a first output connected to the first transmission line and a second output connected to the second transmission line,
wherein the first transmission line is configured to receive a first non-zero transmission voltage and the second transmission line is configured to simultaneously receive a second non-zero transmission voltage different from the first non-zero transmission voltage.
12. The display device of claim 11 , wherein:
the dual-output power supply is a variable dual-output power supply having a first variable output connected to the first transmission line and a second variable output connected to the second transmission line,
each of the first transmission voltage and the second transmission voltage has a different value depending on a position of the sensing units of the plurality of sensing units, and
at least one of the plurality of scan lines is connected to at least a first one of the plurality of sensing units connected to the first transmission line and to at least a second one of the plurality of sensing units connected to the second transmission line, said first and second sensing units being configured to be read simultaneously.
13. The display device of claim 12 , wherein the base substrate comprises a first area and a second area adjacent to the first area along the first direction, and
at least one of the plurality of sensing units is disposed in each of the first area, and the second area.
14. The display device of claim 13 , wherein the sensing unit disposed in the first area is connected to the first transmission line and receives the first transmission voltage, and
the sensing unit disposed in the second area is connected to the second transmission line and receives the second transmission voltage.
15. The display device of claim 14 , wherein the first transmission voltage applied to the sensing unit disposed in the first area has a value different from a value of the second transmission voltage applied to the sensing unit disposed in the second area.
16. The display device of claim 11 , further comprising:
a dummy scan line disposed adjacent to the plurality of scan lines and extending along the first direction; and
a dummy output line disposed adjacent to the plurality of output lines and extending along the second direction.
17. The display device of claim 16 , further comprising a dummy sensing unit connected to the dummy scan line and the dummy output line.
18. The display device of claim 17 , wherein the dummy sensing unit detects a driving current that varies depending on driving time, light or temperature.
19. The display device of claim 11 , wherein each of the plurality of sensing units comprises a thin film transistor.