Control of persistance in EL panels

The performance of electroluminescent (EL) display panels which employ photoconductors (PC) as the control element is strongly dependent upon the design of the panel, the processing techniques and the materials used in construction. This discussion will be limited to variable persistence panels and the factors which control the shape of the brightness wave envelope. Through proper design and construction, square wave brightness output is possible. Data are presented on panels with (1) a simple layered structure, (2) a layered structure with an optical barrier between the EL and PC layers, (3) a grid type structure, and finally (4) a grid structure with a transparent ohmic conductor between the EL and PC elements.