Display device

1. A display device comprising:

a foldable display panel to display an image via a display surface, the foldable display panel having an expanded, substantially planar position and a compact folded position; and

a pressure sensor disposed below the foldable display panel and including at least one first pattern and at least one second pattern without overlapping each other in a direction substantially normal to the display surface when the foldable display panel is in the expanded position, the at least one first pattern overlapping a first portion of the foldable display panel and the at least one second pattern overlapping a second portion of the foldable display panel when the foldable display panel is in the expanded position,

wherein the pressure sensor is configured to sense a magnitude of pressure applied to the foldable display panel when the foldable display panel is in the compact position such that the display surface is exposed outwardly and the at least one first pattern and the at least one second pattern overlap in the direction substantially normal to the display surface and face each other inwardly with an external gap therebetween, with the magnitude of pressure being determined based on a change in distance defined between the at least one first pattern and the at least one second pattern across the external gap, and

wherein the size of the external gap is changed according to a change in distance between the first portion of the foldable display panel and the second portion of the foldable display panel.

2. The display device of claim 1 , wherein:

the at least one first pattern comprises transmitting sensors and the at least one second pattern comprises receiving sensors; and

at least one of the transmitting sensors faces at least one of the receiving sensors when the foldable display panel is in the compact position.

3. The display device of claim 2 , wherein the pressure sensor is configured to detect the pressure via detection of a change in capacitance between the at least one of the transmitting sensors and the at least one of the receiving sensors when the foldable display panel is in the compact position.

4. The display device of claim 1 , wherein:

the pressure sensor comprises first sensors including the at least one first pattern and the at least one second pattern, and second sensors capacitively coupled to the first sensors; and

at least one of the first sensors faces at least another one of the first sensors when the foldable display panel is in the compact position.

5. The display device of claim 4 , wherein the pressure sensor is configured to detect the pressure via detection of a change in capacitance between the at least one of the first sensors and the at least another one of the first sensors when the foldable display panel is in the compact position.

6. The display device of claim 4 , wherein:

the at least one of the first sensors is configured to transmit electric fields; and

the at least another one of the first sensors is configured to receive the electric fields when the foldable display panel is in the compact position.

7. The display device of claim 1 , wherein:

the foldable display panel is folded on a basis of a bending axis;

the at least one first pattern comprises a mutual capacitance type sensor and the at least one second pattern comprises a self-capacitance type sensor; and

the bending axis is defined between the mutual capacitance type sensor and the self-capacitance type sensor.

8. The display device of claim 1 , wherein:

the foldable display panel is bent on a basis of a bending axis;

the at least one first pattern comprises a first force sensing electrode and the at least one second pattern comprises a self-capacitance type sensor; and

the bending axis is defined between the first force sensing electrode and the self-capacitance type sensor.

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

a touch sensor disposed on the foldable display panel.

10. A display device comprising:

a foldable display panel to display an image via a display surface;

a touch sensor disposed on the foldable display panel; and

a pressure sensor disposed below the foldable display panel,

wherein at least one of the touch sensor and the pressure sensor is configured to sense a magnitude of pressure applied to the foldable display panel when the foldable display panel is folded about a folding axis such that a first pattern and a second pattern of the at least one of the touch sensor and the pressure sensor overlap in a first direction substantially normal to the display surface and face each other inwardly with an external gap therebetween, with the magnitude of pressure being determined based on a change in distance defined between the first pattern and the second pattern across the external gap,

wherein, when the foldable display panel is unfolded, the first pattern and the second pattern are spaced apart from each other with the folding axis therebetween without overlapping each other in the first direction such that the first pattern overlaps a first portion of the foldable display panel and the second pattern overlaps a second portion of the foldable display panel, and

wherein the size of the external gap is changed according to a change in distance between the first portion of the foldable display panel and the second portion of the foldable display panel.

11. The display device of claim 10 , wherein:

the display surface is exposed to an outside when the foldable display panel is folded.

12. The display device of claim 10 , wherein:

a portion of the display surface is exposed to an outside and other portions of the display surface are folded to face each other when the foldable display panel is folded.

13. The display device of claim 12 , further comprising:

a fingerprint recognizer disposed between the first bending axis and the second bending axis, the fingerprint recognizer being exposed to the outside when the foldable display panel is folded.