An auto-control display device for incorporating with a lavatory system in a service area such as a lavatory, includes a sensor for sensing a use of the lavatory system, a display unit which is interacted with the sensor and is placed at an eye viewing location within the service area, and an information center, which is connected between a power source and the display unit, for storing at least an electronic information, wherein when the sensor detects the use of the lavatory system, the information center automatically activates the display unit to display the electronic information, and when the sensor detects that the use of the lavatory system is completed, the display unit is automatically deactivated by the information center.