Display apparatus and method for controlling the same

1. A display apparatus, comprising:

a display unit;

a light sensor configured to detect an ambient light and generate a brightness value indicating brightness of the ambient light;

a cooling fan configured to generating a fluid flow in the display apparatus; and

a controller configured to monitor the brightness value and control a rotational speed of the cooling fan based on the brightness value,

wherein the controller is configured to monitor the brightness value per a time period,

the controller is configured to decrease the time period to a first period when the brightness value is greater than a first threshold;

the controller is configured to increase the time period to a second period when the brightness value is smaller than a second threshold; and

the first threshold is greater than the second threshold.

2. The display apparatus of claim 1 , further comprising:

a backlight module located on a first side of the display unit,

wherein the light sensor is located on a second side of the display unit different from the first side and faces away from the display unit, and

wherein the controller is configured to control light emitted from the backlight module based on the brightness value.

3. The display apparatus of claim 2 , wherein the light sensor has an axis forming an angle from approximately −90° to approximately +90° with respect to a normal line to a display surface of the display unit.

4. The display apparatus of claim 1 , further comprising:

a backlight module located on a first side of the display unit,

wherein the light sensor is located on the backlight module and is configured to detect the ambient light and light emitted by the backlight module.

5. The display apparatus of claim 4 , wherein a brightness of the backlight module is controlled according to the brightness value detected when the backlight module is turned off.

6. The display apparatus of claim 1 , wherein:

the light sensor includes a camera,

the controller is configured to determine whether an object is in front of the camera based on an image generated by the camera, and

the controller is configured to control the cooling fan based on a previous brightness value when the object is determined to be in front of the camera.

7. The display apparatus of claim 1 , wherein:

the controller is configured to increase the rotational speed of the cooling fan to a first value when the brightness value is greater than a first threshold,

the controller is configured to decrease the rotational speed of the cooling fan to a second value when the brightness value is smaller than a second threshold, and

the first threshold is greater than the second threshold.

8. The display apparatus of claim 7 , wherein:

the controller is configured to increase the rotational speed of the cooling fan to a third value when the brightness value is greater than a third threshold, and

the third threshold is greater than the first threshold.

9. The display apparatus of claim 7 , wherein:

the controller is configured to decrease the rotational speed of the cooling fan to a fourth value when the brightness value is smaller than a fourth threshold, and

the second threshold is greater than the fourth threshold.

10. The display apparatus of claim 1 , wherein the controller is configured to decrease the time period to a third period when the brightness value is greater than a third threshold, and the third threshold is greater than the first threshold.

11. The display apparatus of claim 1 , wherein the controller is configured to increase the time period to a fourth period when the brightness value is smaller than a fourth threshold and the fourth threshold is smaller than the second threshold.

12. The display apparatus of claim 1 , wherein the rotational speed of the cooling fan increases in proportional to the brightness value.

13. The display apparatus of claim 1 , wherein an acceleration of the rotational speed of the cooling fan increases in proportional to the brightness value.

14. A method for controlling a display apparatus, the method comprising:

generating a fluid flow in a display apparatus with a cooling fan;

detecting ambient light of the display apparatus with a light sensor;

generating a brightness value indicating brightness of the ambient light;

monitoring the brightness value; and

controlling a rotational speed of the cooling fan based on the brightness value, wherein the brightness value is monitored per a time period;

decreasing the time period to a first period when the brightness value is greater than a first threshold; and

increasing the time period to a second period when the brightness value is smaller than a second threshold;

wherein the first threshold is greater than the second threshold.

15. The method of claim 14 , wherein controlling the rotational speed of the cooling fan comprises:

increasing the rotational speed of the cooling fan to a first value when the brightness value is greater than a first threshold; and

decreasing the rotational speed of the cooling fan to a second value when the brightness value is smaller than a second threshold,

wherein the first threshold is greater than the second threshold.

16. The method of claim 15 , wherein controlling the rotational speed of the cooling fan comprises:

increasing the rotational speed of the cooling fan to a third value when the brightness value is greater than a third threshold,

wherein the third threshold is greater than the first threshold.

17. The method of claim 15 , wherein controlling the rotational speed of the cooling fan comprises:

decreasing the rotational speed of the cooling fan to a fourth value when the brightness value is smaller than a fourth threshold,

wherein the second threshold is greater than the fourth threshold.

18. The method of claim 14 , further comprising:

decreasing the time period to a third period when the brightness value is greater than a third threshold,

wherein the third threshold is greater than the first threshold.

19. The method of claim 14 , further comprising:

increasing the time period to a fourth period when the brightness value is smaller than a fourth threshold,

wherein the second threshold is greater than the fourth threshold.

20. The method of claim 14 , wherein the rotational speed of the cooling fan increases in proportion to the brightness value.

21. The method of claim 14 , wherein an acceleration of the rotational speed of the cooling fan increases in proportion to the brightness value.

22. The method of claim 14 , further comprising:

determining whether an object is in front of the display apparatus, and

wherein the rotational speed of the cooling fan is controlled based on a previous brightness value when the object is in front of the display apparatus.