A communication apparatus uses a short range communication function for displaying a decrease of remaining battery power of a cellular phone that is in communication with the communication apparatus based on a report from the cellular phone when the remaining battery power decreases to a predetermined threshold. The first patterned electrode 12 is circular and formed with a cutout 14 at the center thereof. A grip retaining ring 60 is positioned at a nodal location. The display panel includes an organic layer formed in the display area and a common electrode covering the organic layer, the common electrode extending in the non-display area.