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.

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.

Abstract: A full-color illuminating unit includes a first circuit board which is a disk having a hole and a plurality of green lights and red lights installed around the hole. A second circuit board which is a disk includes a blue light installed thereon. A first housing has an isolation plate integrally connected with an inner periphery thereof, thus separating the first housing into a first cavity and a second cavity. The first circuit board is installed in the first cavity while the second circuit board is installed in the second cavity. A boss protrudes from the isolation plate to the first cavity and is in communication between the first cavity and the second cavity. The first circuit board is positioned in place, with the periphery of the hole thereof being around the boss. The blue light is positioned in the boss, with a portion thereof protruding beyond an opening of the boss. A second housing is attached to the first housing, thus enclosing the second circuit board.