Display apparatus having means for creating a spectral color eff

Details Display apparatus having means for creating a spectral color eff Display apparatus having means for creating a spectral color eff

1976-10-28

1978-01-10

Pitrelli, John F.

Card, picture, or sign exhibiting

Illuminated sign

Indirect

40581, 40137, 40454, G09F 1306

Patent

active

040671291

ABSTRACT:
Display apparatus including a display surface containing advertising and/or other informative or decorative matter and having at least portions thereof slotted or transparent. Diffraction grating means are positioned to the rearward side of the display surface and means are provided for illuminating the diffraction grating in order to create a color spectrum effect which is projected through the aforesaid transparent openings or slots, creating a highly aesthetically-pleasing effect, the distribution of the colors being changed with changes in position of the viewer. The openings may preferably be in the form of symbol or a composite thereof. The opaque regions of the display surface may, in one preferred embodiment, be reflective.

REFERENCES:
patent: 859199 (1907-07-01), Chinnery
patent: 3538323 (1970-11-01), Ziegler
patent: 3805049 (1974-04-01), Frank et al.
patent: 3806722 (1974-04-01), Peake et al.
patent: 3840732 (1974-10-01), Cohen

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