Patent ID: 8136278

Claim:
An electroluminescent one-way vision panel comprises a design visible from one side of the panel and not visible from the other side of the panel, a sheet of imperforate light permeable material having two sides, one side facing said one side of said panel and the other side facing said other side of said panel, said sheet comprising a light permeable electrically conductive coating over the whole area of the other side of the sheet, a print pattern applied to the electrically conductive coating which subdivides the panel into printed portions and unprinted portions, the print pattern comprising an electroluminescent ink system comprising a printed electroluminescent ink layer, a printed dielectric ink insulating layer and a print pattern conductive ink layer, wherein the design is superimposed on or forms part of the print pattern, and wherein the design comprises a transparent or translucent design layer, and wherein the conductive coating and the print pattern conductive ink layer are connected to an electrical power supply, and wherein the electroluminescent ink layer is capable of being illuminated by means of electric current through the conductive coating and the print pattern conductive ink layer, and wherein illumination of the electroluminescent layer illuminates the design, wherein a cross-section section taken through said panel comprises the sheet of light permeable material coated with a uniform electrically conductive coating on said other side of said sheet, said sheet having two outer edges, said print pattern being applied directly to said electrically conductive coating, said print pattern comprising at least three layers including an electroluminescent ink layer, a dielectric ink insulating layer and a conductive ink layer, said cross-section comprising alternate printed portions of said sheet and unprinted portions of said sheet, each of said printed portions having two outer edges, a plurality of said printed portions being constructed and arranged such that they each include a part of said electroluminescent ink layer and a part of said dielectric ink insulating layer and a part of said conductive ink layer, said plurality of said printed portions each including two outer edges of said part of said electroluminescent ink layer and two outer edges of said part of said dielectric ink insulating layer and two outer edges of said part of said conductive ink layer, and wherein within each of said plurality of said printed portions said part of said dielectric ink insulating layer is located between said part of said electroluminescent ink layer and said part of said conductive ink layer, and wherein each of said two outer edges of said part of said electroluminescent ink layer and each of said two outer edges of said part of said conductive ink layer is located within said two outer edges of said part of said dielectric ink insulating layer, and wherein the average width between said two outer edges of said plurality of printed portions is less than one centimeter.