Display module

Claim 1

A display module for displaying a symbol, said display module comprising: a liquid crystal display including first and second glass plates, a liquid crystal material between said glass plates, first and second polarizers adjacent said first and second glass plates, respectively, and first and scond transparent electrodes on the inner surfaces of said first and second glass plates, respectively; a source of electricity, and a circuit connected to said source of electricity and said electrodes for applying an electric field across said liquid crystal material; a housing for supporting said liquid crystal display, said source of electricity, and said circuit in assembled relation; symbol depicting means having a symbol for display to a viewer; and a supporting structure receivable in said housing for supporting said symbol depicting means behind said liquid crystal display with the symbol within the projected area defined by the overlapping portions of said first and second electrodes, said symbol being selectively displayed and masked by selectively applying said electric field to said liquid crystal material for selectively blocking and unblocking the transmission of light through the area of said liquid crystal display defined by said overlapping electrode portions; said housing having a slot in a wall thereof in alignment with an edge of said symbol depicting means for accommodating removal of said symbol depicting means from said housing for permitting replacement of said symbol depicting means with a different symbol depicting means having a different symbol.