Display device

1. A display device including a folding region and a rigid region, the display device comprising:

a foldable display panel module to fold in the folding region;

a folding sensor to sense a folding state of the foldable display panel module;

a support on the foldable display panel module in the rigid region;

a vibrator on the foldable display panel module in the folding region; and

a vibration controller to control a vibration operation of the vibrator based on the folding state.

2. The display device as claimed in claim 1 , wherein the vibration controller is to generate a first control signal to control the vibrator to vibrate for a first time period and with a first amplitude and a first duration when the foldable display panel module is folded during a first threshold time.

3. The display device as claimed in claim 2 , wherein the vibration controller is to generate a second control signal to control the vibrator to vibrate for a second time period less than the first time period when the foldable display panel module is folded during a second threshold time longer than the first threshold time.

4. The display device as claimed in claim 2 , wherein the vibration controller is to generate a third control signal to control the vibrator to vibrate with a second amplitude greater than the first amplitude when the foldable display panel module is folded during a second threshold time longer than the first threshold time.

5. The display device as claimed in claim 2 , wherein the foldable display panel module is to generate a fourth control signal to control the vibrator to vibrate with a second duration longer than the first duration when the foldable display panel module is folded during a second threshold time longer than the first threshold time.

6. The display device as claimed in claim 1 , wherein the vibration controller is to receive audio data and to generate a control signal to control the vibrator to generate sound corresponding to the audio data.

7. The display device as claimed in claim 1 , wherein the vibrator is only in the folding region, the vibrator being external to the foldable display panel module.

8. The display device as claimed in claim 1 , wherein the vibrator includes:

a first electrode;

a second electrode opposing the first electrode; and

a vibration film between the first electrode and the second electrode, and wherein the first and second electrodes with the vibration film therebetween are foldable and completely overlap the folding region.

9. The display device as claimed in claim 8 , wherein the vibration film includes a polyvinylidene fluoride (PVDF) piezoelectric film.

10. The display device as claimed in claim 1 , wherein the folding and rigid regions have constant boundaries, and the folding sensor is between the foldable display panel module and the vibrator in the folding region.

11. A display device including a first folding region, a second folding region, and a rigid region, the display device comprising:

a foldable display panel module to fold in the first folding region and the second folding region;

a folding sensor to sense a first folding state of the first folding region and a second folding state of the second folding region;

a support on the foldable display panel module in the rigid region;

first and second vibrators on the foldable display panel module in the first and second folding regions, respectively; and

a vibration controller to control vibration operations of the first and second vibrators based on the first and second folding states.

12. The display device as claimed in claim 11 , wherein the vibration controller is to receive audio data and to generate a control signal to control the first and second vibrators to generate sound corresponding to the audio data.

13. The display device as claimed in claim 12 , wherein the vibration controller is to determine a sound mode based on the first folding state and the second folding state and is to control the first and second vibrators based on the determined sound mode, wherein the sound mode is one of a stereo mode, a mono mode, or a mute mode.

14. A display device, comprising:

a flexible display panel module including first to (N)th regions, where N is an integer greater than 0;

a bending sensor to sense a bending state of each of the first to (N)th regions;

first through (N)th vibrators located in the first to (N)th regions, respectively; and

a vibration controller to control a vibration operation of the first to (N)th vibrators based on the bending state of each of the first through (N)th regions.

15. The display device as claimed in claim 14 , wherein the vibration controller is to generate a first control signal to control a (K)th vibrator to vibrate for a first time period and with a first amplitude and a first duration when a bending degree of a (K)th region of the flexible display panel module is greater than a threshold value during a first threshold time, where K is an integer between 1 and N.

16. The display device as claimed in claim 15 , wherein the vibration controller is to generate a second control signal to control at least one of the vibrators to vibrate with a second time period less than the first time period when the bending degree of the (K)th region of the flexible display panel module is greater than the threshold value during a second threshold time longer than the first threshold time.

17. The display device as claimed in claim 15 , wherein the vibration controller is to generate a third control signal to control at least one of the vibrators to vibrate with a second amplitude greater than the first amplitude when the bending degree of the (K)th region of the flexible display panel module is greater than the threshold value during a second threshold time longer than the first threshold time.

18. The display device as claimed in claim 15 , wherein the vibration controller is to generate a fourth control signal to control at least one of the vibrators to vibrate for a second duration longer than the first duration when the bending degree of the (K)th region of the flexible display panel module is greater than the threshold value during a second threshold time longer than the first threshold time.

19. The display device as claimed in claim 14 , wherein the vibration controller is to receive audio data and to generate a control signal to control at least one of the first to (N)th vibrators to generate a sound corresponding to the audio data.

20. The display device as claimed in claim 19 , wherein the vibration controller is to adjust a volume of the sound based on a bending degree of the flexible display panel module.