Abstract: In an electronic device system, a computer is connected to a port replicator connectable to an extended input device and extended liquid crystal display device. The system enables the notebook computer to be easily detached even when the system is installed in a vehicle. Accordingly, information stored in the computer is easily retrievable when any problem occurs to the vehicle where the system is installed.

Abstract: In an electronic device system, a computer is connected to a port replicator connectable to an extended input device and extended liquid crystal display device. The system enables the notebook computer to be easily detached even when the system is installed in a vehicle. Accordingly, information stored in the computer is easily retrievable when any problem occurs to the vehicle where the system is installed.

Abstract: The liquid crystal display (LCD) unit contains at least a light source for illuminating the LCD unit and one or more illuminating switch responsible for entry operation. Operating brightness control switch allows a control circuit to generate a signal. An inverter circuit according to the signal from the control circuit adjusts brightness of the light source, and brightness of the illuminating switch is controlled by the signal. As a result, the LCD unit can have an adjustment adaptable to various changes in ambient light condition, providing users with greatly improved easy-to-view.