An electronic device may include a proximity sensor, a touch sensor, and one or more light emitting elements. The touch sensor may be configured to detect touch input provided on a surface of the electronic device at a location in front of the touch sensor for purposes of powering on the electronic device. Prior to powering on the electronic device, a location of the touch sensor may remain inconspicuous. When the proximity sensor detects an object, such as a user, which moves within a threshold distance from a surface of the electronic device, the location of the touch sensor can be made conspicuous. After the power switch is made conspicuous, the user is able to see where to provide touch input on the electronic device to power on the electronic device.

Provided is a refrigerator. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

Provided is a refrigerator. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

Provided is a refrigerator. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

An electronic device includes a top panel having a manipulation surface; a coordinate detector configured to detect coordinates of a manipulation input performed on the manipulation surface; a first vibrating element; and a drive controlling part configured to drive the first vibrating element by using a driving signal for generating a natural vibration in an ultrasound frequency band of the manipulation surface, the drive controlling part being configured to drive the vibrating element such that an intensity of the natural vibration changes in accordance with a position of the manipulation input and in accordance with a degree of time change of the position, wherein the top panel has a periodic structure whose thickness changes in a periodic manner in accordance with a period of a standing wave in a direction in which antinodes and nodes of the standing wave generated by the natural vibration are arrayed.

A display device including a display panel having a variable curvature, the variable curvature being configured to switch between a curved state and a flat state, a frame configured to fix a portion of the display panel, a sensor mounted on the frame, the sensor being configured to transmit and receive acoustic waves, and a controller configured to determine whether an object is in contact with the frame based on a signal associated with the acoustic waves, wherein, while the variable curvature is switching from the curved state to the flat state, the switching is stopped in response to a determination that the object is in contact with the frame.

An electronic device includes a top panel having a manipulation surface; a coordinate detector configured to detect coordinates of a manipulation input performed on the manipulation surface; a first vibrating element; and a drive controlling part configured to drive the first vibrating element by using a driving signal for generating a natural vibration in an ultrasound frequency band of the manipulation surface, the drive controlling part being configured to drive the vibrating element such that an intensity of the natural vibration changes in accordance with a position of the manipulation input and in accordance with a degree of time change of the position, wherein the top panel has a periodic structure whose thickness changes in a periodic manner in accordance with a period of a standing wave in a direction in which antinodes and nodes of the standing wave generated by the natural vibration are arrayed.

Provided is a refrigerator. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

Provided is a refrigerator. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

Provided is a refrigerator. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.