Patent 7035665 was granted and assigned to NEC on April, 2006 by the United States Patent and Trademark Office.
A portable terminal device of the invention has a first casing that has a first display part and a second casing that has a key operation part. The first casing and the second casing are constructed in such a form as to be rotatable around a hinge portion, which has a second display part. In a state where the terminal device is open, the first display part is visually recognizable by the user, and in a state where the terminal device is closed, the second display part is visually recognizable by the user.