Abstract: It is an object of the invention to provide a portable terminal device in which a display of a high visual effect can be performed. The portable terminal device of the invention has: plural light emitting elements 11; and a controlling section 21 which selectively drives the respective plural light emitting elements 11 to cause the plural light emitting elements 11 to perform a matrix display based on display data.

Abstract: A mobile unit communication apparatus (COMM APP) having digital and analog transmission (XMSN) modes is disclosed, which comprises: a radio wave XMSN and receiving portion including an antenna for transmitting digital and analog XMSN signals in the digital and analog XMSN modes respectively; a signal (SIG) processing portion including a DSP portion and an ASIC portion for processing the received digital and analog XMSN SIGs in the digital and analog COMM modes respectively; an input and output portion for inputting an input SIG and outputting an output SIG from the digital XMSN SIG from the digital processing portion in the digital COMM mode and from the analog XMSN SIG from the ASIC portion in the analog COMM mode; and a supply power saving portion for operating the ASIC portion and not operating the digital SIG processing portion in the analog COMM mode to reduce a consumption of the supply power.

Abstract: In order to surely prevent display disappearance due to static electricity, a liquid crystal display unit according to the invention includes a structure that at least a part of a glass shielding portion on the periphery of a liquid crystal panel is surrounded by an earthing frame, and the earthing frame is connected to an earth point of a printed circuit board.

Abstract: A control method applicable to a battery-driven portable device such as a portable radio telephone device for suppressing quiescent currents appearing when the device is not under operation, thereby extending the useful service life of an external power source such as a battery. In one example, required power inputs supplied to power input terminals for activating the total device system act as trigger inputs to a power control circuit including a pulse generator circuit, thereby generating a pulse during only a period controllably determined by a CR time constant circuit connected additionally to the pulse generator, and a CPU confirms sufficient conditions required for activating the system on the basis of outputs appearing on ports of the power control circuit.

Abstract: In order to reduce volume and weight of a power supply of a compact portable telephone set and thus reduce volume and weight of the compact portable telephone set itself, a P-channel power MOSFET is used as a power switching element, and a negative voltage, for example, -11 volts is applied across a source and a gate from a DC/DC converter to turn on the P-channel power MOSFET so that power is supplied from a battery 2 which serves as one power supply. When the gate and the source of the power MOSFET are maintained at the same potential, the power MOSFET is turned off and power is supplied from another power supply.