Abstract: A display unit has multiple illuminators provided in a housing of the unit. The display unit has a right prism composed of at least four side faces each with a unique color and being detachably connected with a step motor. The display unit is able to provide the necessary brightness by means of the illuminators when the ambient light is not sufficient.

Abstract: The license plate number of a specific vehicle is related to a passcode that is built into a communications reception unit installed in the vehicle. When a driver enters a plate number of the vehicle having the communication reception unit installed, he can communicate with another vehicle. The communication reception unit can receive satellite positioning signals to provide more accurate coordinates to a control center, which can determine the position of the vehicle and send accurate, useful and relevant information to the vehicle.

Abstract: A magnetically operated display unit includes a frame with a color, a plate pivotably mounted on the frame and including a first surface with a color different to that of the frame and a second surface with a color identical to that of the frame, a magnet embedded in the plate, a pair of bobbins mounted on the frame so that two tips of the magnet are located between two tips of the pair of bobbins, a solenoid mounted on the U-shaped ferromagnetic element and a light emitting diode mounted on the frame. The plate defines a cutout for receiving the light emitting diode and one of the bobbins. The light emitting diode includes a tip located on a level between the plate and the tips of the pair of bobbins. Opposite polarities are selectively induced in the pair of bobbins.

Abstract: A method of operating a magnetically operated display unit that includes a frame of a color, a plate pivotably mounted on the frame which includes a first surface of a color different from that of the frame and a second surface of a color identical to that of the frame, a magnet embedded in the plate, a U-shaped ferromagnetic element mounted on the frame so that two tips of the magnet are located between two tips of the U-shaped ferromagnetic element, a solenoid mounted on the U-shaped ferromagnetic element and a light emitting diode mounted on the frame. The plate contains a cutout designed for receiving the light emitting diode and one of the tips of the U-shaped ferromagnetic element. The tip of the light emitting diode is located on a level between the plate and the tips of the U-shaped ferromagnetic element. The light emitting diode is visible sufficiently above the surface of the plate so that its light can shine on that surface.

Abstract: A magnetically operated display unit includes a frame of a color, a plate pivotably mounted on the frame which includes a first surface of a color different from that of the frame and a second surface of a color identical to that of the frame, a magnet embedded in the plate, a U-shaped ferromagnetic element mounted on the frame so that two tips of the magnet are located between two tips of the U-shaped ferromagnetic element, a solenoid mounted on the U-shaped ferromagnetic element and a light emitting diode mounted on the frame. The plate contains a cutout designed for receiving the light emitting diode and one of the tips of the U-shaped ferromagnetic element. The tip of the light emitting diode is located on a level between the plate and the tips of the U-shaped ferromagnetic element. The light emitting diode is visible sufficiently above the surface of the plate so that its light can shine on that surface. Two opposite currents are selectively directed through the solenoid.