On a transparent electrically insulating substrate, formed are a scanning line, and a gate electrode of a switching element, further formed are a gate insulating film, a semiconductor layer, an n+-Si layer to be formed into a source electrode and a drain electrode. In one embodiment, a video coderdecoder used by a thin device is determined. Therefore, even if the throttle opening is opened to accelerate the vehicle, the engine rotation speed is never radically increased under such a transmission condition. By redistributing functionality, the network-based structure of this home automation and security system can overcome the disadvantages of conventional home automation and security systems. An overall productivity based on each of the computational components may also be determined.