Refrigerator and method for controlling refrigerator

1. A refrigerator, comprising:

a main body having a first storage chamber and a second storage chamber;

a first door configured to open and close the first storage chamber, the first door having a first display area defined at a front surface thereof;

a second door configured to open and close the second storage chamber, the second door having a second display area defined at a front surface thereof;

a first sensor configured to detect an approach of a user to the refrigerator;

at least one second sensor configured to sense a user input by the user to each of the first door and the second door; and

a controller configured to independently control the first display area and the second display area, the controller being configured to change a color of at least one of the first display area or the second display area based on the user input sensed by the at least one second sensor,

wherein each of the first display area and the second display area comprises:

a first tempered glass layer that covers the front surface of a corresponding door among the first and second doors,

a second tempered glass layer spaced apart from the first tempered glass layer, and

an electric field dependent layer disposed between the first tempered glass layer and the second tempered glass layer, the electric field dependent layer being configured to define the color of the corresponding door based on control of the controller, and wherein the controller further configured to:

switch an activation state of any one second sensor that senses a first user input for selecting a first function among a plurality of functions related to the first door or the second door, based on a detection result of the first sensor,

execute the first function and further switch an activation state of another second sensor different from the one second sensor to an activated state based on first user input being sensed through the one second sensor switched to the activated state, and

sense a second user input for selecting a second function among the plurality of functions related to the first door or the second door through the another second sensor switched to the activated state.

2. The refrigerator of claim 1 , wherein the first sensor is configured to be maintained as turned on, and the at least one second sensor is configured to be turned on or off according to a sensing result of the first sensor.

3. The refrigerator of claim 1 , wherein the first sensor is disposed at a height higher than or equal to a predetermined height from a floor, and

wherein the at least one second sensor comprises a plurality of sensors that are disposed at the first door and the second door, respectively, and configured to sense the user input applied to each of the first door and the second door.

4. The refrigerator of claim 1 , wherein a transparency of the first display area or the second display area is adjusted based on the user input sensed through the at least one second sensor, and

wherein the controller is configured to turn on a lighting provided in the first storage chamber or the second storage chamber based on the adjusted transparency of the first display area or the second display area.

5. The refrigerator of claim 1 , wherein the at least one second sensor comprises (i) a knock-on sensor configured to receive a knock-on input or (ii) a touch sensor configured to receive a touch input.

6. The refrigerator of claim 1 , wherein the at least one second sensor comprises a proximity sensor disposed at a vicinity of a floor, and

wherein the first sensor is disposed higher than a position of the proximity sensor with respect to the floor.

7. The refrigerator of claim 1 , wherein the first and second display areas are configured to display image information including at least one of text, an image, or a video based on control of the controller.

8. The refrigerator of claim 1 , further comprising a memory configured to store programs or applications configured to run on the refrigerator,

wherein a part of the programs or applications stored in the memory is configured to be downloaded through wireless communication from an external server.

9. The refrigerator of claim 1 , wherein the electric field dependent layer comprises a conductive fluid, and

wherein the controller is configured to control a surface tension of the conductive fluid based on applying a voltage according to the user input to thereby vary a wavelength of light reflected by the conductive fluid.

10. The refrigerator of claim 1 , wherein the first sensor is a separate device that is attachable to the refrigerator and includes a built-in battery, and

wherein the controller is configured to identify that the first sensor is attached to the main body through a short-range communication and to receive a sensing result of the first sensor through the short-range communication.

11. The refrigerator of claim 1 , wherein the controller further configured to:

terminate the first function based on a certain period of time having elapsed while the first function is being executed; and

based on the first function being terminated, recheck a sensing result of the first sensor and determine whether to deactivate the another second sensor based on the rechecked sensing result of the first sensor.

12. The refrigerator of claim 1 , wherein the controller is provided in a computer system and configured to control the main body, the first door, the second door, and the first sensor, and the at least one second sensor.

13. The refrigerator of claim 1 , wherein the electric field dependent layer comprises a polymer dispersed liquid crystal (PDLC) layer configured to switch a transparency of the at least one of the first display area or the second display area.

14. The refrigerator of claim 1 , wherein the electric field dependent layer comprises a cholesteric liquid crystal layer configured to adjust a helical pitch thereof to thereby define the color of the at least one of the first display area or the second display area.