Back lighted panel

Claim 1

A back lighted display device comprising a translucent panel, a support structure spaced from said panel and provided with lighting means for transmitting light to the panel, said panel comprising a first substantially flat translucent plate secured to the support structure, a second substantially flat translucent plate disposed adjacent said first flat plate on the opposite side thereof from said lighting means, art work sheet means interposed between said first and second flat plates and having selective opaque portions and selective transparent portions thereon for selectively transmitting light through said second flat plate for providing a lighted pattern, suction means communicating with the space between said flat plates for releasably securing said second flat plate to said first flat plate, said art work sheet means being responsive to said suction means for releasably adhering to one of said flat plates, said panel including sealing means extending around the outer periphery thereof between said two plates, said suction means comprising aperture means provided in said first flat plate, pump means, and conduit means connected between the pump means and the aperTure means for transmitting suction thereto upon actuation of the pump means.