Abstract: Each of a row of spaced, parallel, fired-on silver electrodes or bar segments on the face of a substrate has one end thereof disposed in spaced, confronting relation to one edge of an elongate terminal of fired-on silver, which is formed on the face of the substrate parallel to the row of segments. A plurality of wire-sized grids project from said one end of each segment into spaced, parallel, intermeshed relation with a plurality of similar grids which project from the inner edge of the terminal. These spaced sets of grids, there being one such set for each segment, are coated with a photoconductive material to form with the associated set of grids a light-sensitive switch. A first EL lamp overlies the sets of grids or switches with its light-transmitting side facing downwardly; and a second EL lamp overlies the bar segments with its light-transmitting side facing upwardly. Normally when an AC signal is applied across said terminal and the upper electrode on the second lamp, the latter is not illuminated.

Abstract: A lamp assembly for providing light emission only over a selected portion of the visible spectrum which lamp assembly includes an electroluminescent means for emitting light over a predeterminable range of the visible spectrum which includes such selected portion. The lamp assembly further includes a first fluorescent means which absorbs light emitted by the electroluminescent means over another portion of the predeterminable range which does not include the selected portion thereof and emits the absorbed light over the desired selected portion. Additional light emitted by the electroluminescent means over still other portions of the visible spectrum can be prevented from emission from the lamp assembly by the use of a suitable filter therefor or by the use of an additional fluorescent means which absorbs such additional light and emits such absorbed light over the portion of the spectrum in which light is absorbed by the first fluorescent means.

Abstract: A new structure comprising a layer of an imaging material, capable of undergoing an image forming change in response to energy, a layer of a barrier material and a layer of a catalyst material which, if necessary after activation, is capable of causing or promoting the image forming change in the imaging material. The barrier material is capable of controlling in accordance with a desired image pattern, the passage of the catalyst material through the barrier layer into contact with the imaging material in selected areas, while it prevents passage of the catalyst material in other selected areas.