The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. A user may focus on one or more words to provide a visualization of connections specific to the focused word. When a guardian cell stores a first guardian value, the connected memory cells are held to a first bit value. The emergency call unit is also arranged to dial a predetermined emergency telephone number when the button on the pendant is actuated and the telephone line is available for an outbound call.