Matrix display device

A back-illuminated display matrix comprising a base panel fitted with an array of electromagnet poles and a module replaceably mounted on the front of said panel carrying a number of rotatable display vanes each vane having coupled thereto a permanent magnet arranged to be opposite a corresponding one of said electromagnet poles, said module comprising an array of translucent diffusers, said module and said base panel including means engaging one with the other for allowing sliding movement of said module on said base panel between a first position in which said engagement means prevents removal of said module from said base panel and a second position in which said module is separable from said base panel, said display matrix including inhibiting means for hindering movement of said module from said first to said second position.

A back-illuminated display matrix including an assembly comprising a base panel fitted with an array of electromagnet poles and a number of rotatable display vanes, each vane having coupled thereto a permanent magnet arranged to be opposite a corresponding one of said electromagnet poles, said display matrix including a display sheet having a number of light-diffusing translucent areas, said assembly including means engaging said display sheet with said assembly for allowing sliding movement of said sheet on said assembly between a first position in which said engagement means prevents removal of said display sheet from said assembly and a second position in which said display sheet is removable from said assembly, said display matrix including inhibiting means for hindering movement of said display sheet from said first to said second position.