Sensor, touch sensor, and display device

1. A display device, comprising:

a display panel comprising a display area; and

a sensor configured to sense a pressure of a touch, the sensor being overlapped with the display area of the display panel,

wherein the sensor comprises:

a first conductor comprising metal lines forming openings;

a second conductor spaced apart from the first conductor, and configured to form capacitance with the first conductor;

an elastic buffer member disposed between the first conductor and the second conductor; and

one or more variable resistance elements connected with the first conductor,

wherein sizes of the openings gradually decrease in a direction from a center of the display area to a non-display area.

2. The display device of claim 1 , wherein a resistance of at least one of the variable resistance elements and the capacitance are changed in accordance with the pressure applied by the touch.

3. The display device of claim 1 , wherein the one or more variable resistance elements are positioned on the first conductor.

4. The display device of claim 3 , wherein the one or more of the variable resistance elements are positioned between the first conductor and the second conductor.

5. The display device of claim 3 , wherein the first conductor is positioned between the one or more variable resistance elements and the second conductor.

6. The display device of claim 1 , wherein at least some of the variable resistance elements are provided on a same layer as that of the first conductor.

7. The display device of claim 1 , wherein the one or more variable resistance elements comprise nano particles.

8. The display device of claim 7 , wherein the nano particle comprises at least one of a nano column, a nano rod, a nano pore, and a nano wire.

9. The display device of claim 1 , wherein the one or more variable resistance elements comprise at least one of a silver nano wire and a carbon nano tube.

10. The display device of claim 1 , wherein the first conductor has a mesh structure.

11. The display device of claim 1 , wherein the metal lines comprise a first metal line and a second metal line which are spaced apart from each other, and

the one or more variable resistance elements are connected between the first metal line and the second metal line.

12. The display device of claim 1 , wherein the display panel comprises a first surface, and

a second surface opposite to the first surface, and the sensor is positioned on the first surface of the display panel.

13. The display device of claim 12 , wherein the display panel displays an image through the first surface.

14. The display device of claim 1 , wherein the elastic buffer member comprises a plurality of sub-buffer members which are separate from each other.

15. The display device of claim 1 , wherein the variable resistance elements number two or more.

16. The display device of claim 15 , wherein the variable resistance elements are disposed along an edge of the first conductor.

17. The display device of claim 15 , wherein the variable resistance elements are regularly disposed in the first conductor.

18. The display device of claim 15 , wherein the variable resistance elements are irregularly disposed in the first conductor.

19. The display device of claim 15 , wherein the variable resistance elements are disposed in the first conductor along a non-linear path.

20. The display device of claim 1 , further comprising:

a bracket configured to accommodate the display panel and the sensor,

wherein the second conductor is a part of the bracket accommodating the display panel and the sensor.