Display device with selectable operational modes, method in a display device and a control device to alter operational mode of a display device

A method for operating a display device, said device comprising wireless communication capabilities for communicating with an external control system, said method comprising:

• changing from a first operating state of the device to a second operating state of the device based on a signal sent from said external control system, wherein the power consumption of said device in said first operating mode is different from the power consumption of said device in said second operating mode.

A control device arranged to provide external energy for waking up the display device with wireless communication capabilities for communicating with an external control system, wherein said device has a first operating mode and a second operating mode, the power consumption of said device in said first operating mode being different from the power consumption of said device in said second operating mode, and wherein said device is arranged to change from said first operating mode to said second operating mode based on a signal sent by an external control system, wherein the device has a deep sleep operating mode, said device comprising a timer arranged to wake up said device from said deep sleep operating mode to another operating mode after a predetermined sleeping period, wherein all other blocks of said device except those needed by the timer are arranged to be shut off during said deep sleep operating mode.