An electronic system includes: a first device configured to generate an output signal in response to current input data and generate a power saving signal based on the current input data; a second device, and a controller. The output signal is perceivable using a physiological sense. The controller is configured to switch the electronic system into one of an inactive state and an active state, operate the second device during the active state in a power saving mode when the power saving signal is activated, and operate the second device during the active state in a normal power mode when the power saving signal is deactivated.
