Illuminated grid display with primary and secondary copy

Claim 1

In a point of purchase advertising display device which has primary copy and secondary copy, each consisting of several characters, the improvement comprising, in combination: a front element of substantial size which has a front fine pattern of transparent and opaque areas, and primary copy on said front element which is transparent or translucent and occupies only a small part of said element, said front pattern occupying substantially all of the front element except for what is occupied by said primary copy; a rear element which has a rear fine pattern of visually contrasting areas which is dissimilar from said front fine pattern and which cooperates with said front pattern to produce a field, said field presenting changing visual effects when the front pattern occupies different positions relative to a line of sight from a viewer's eye to said rear pattern, said primary copy being repeated on said rear element effectively in register with said primary copy on the front element, and secondary copy on the rear element, all said copy on the rear element contrasting visually with said rear pattern and the margins of all the characters of said secondary copy being defined by the rear pattern and said secondary copy being visible through parts of said front pattern; and means operatively associated with said front and rear elements to provide for a change in the position occupied by said front pattern relative to a line of sight from a viewer's eye to said rear pattern; whereby the primary copy is very clearly defined in a changing field and the secondary copy is relatively obscure and the characters thereof appear to change shape as said field changes.