Abstract: A device for projecting spectral display onto a viewing surface, having numerous light projecting segments attached to rotating hollow shafts, mounted and rotating upon each other on coaxial based shaft. The projecting segments include a light emitting source to produce light rays, a light convergent member such as lens and a diffraction member such as prism or diffraction gratings, for effecting spectral dispersion of the light rays for projecting same onto viewing surface to create the spectral display in a motion or a dynamic spectral display. The rotating hollow shafts provide built-in electrical wiring tracks and a connection to energize the light source, and they also provide mechanical connection through geared wheel to receive power to effect the rotating motion. The projecting segments with their respective rotating shafts are accommodated inside a casing or a housing of the device, which can be individual or portable.

Abstract: A device for projecting a rainbow-like spectral display including a housing provided with a projecting arrangement for projecting the rainbow-like spectral display onto a viewable surface. The projecting arrangement includes segments, each segment including a light emitting source for producing light rays, and a diffraction member such as a prism for effecting a spectral dispersion of the light rays for projecting same to produce the rainbow-like spectral display. Preferably, each segment also includes a convergent or convex lens disposed between the light emitting source and the diffraction member, and a reflector covering a rear portion of each light emitting source. The housing could be portable, battery operated, and in the form of a casing provided with a hinged cover.