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Electroluminescent panels
| Details |
Inventors: Simopoulos, Nicholas T.; Simopoulos, George N.; Simopoulos, Gregory N.;
Assignee: Luminescent Electronics, Inc. (Dayton, OH)
Primary Examiner: Demeo; Palmer C.
Assistant Examiner:
Attorney, Agent or Firm: Biebel, French & Nauman
An electroluminescent panel and method of making the same includes a plurality of layers on a transparent electrode in which each layer is formed with the same compatible polymer carrier resin base material so that the individual layers have an integrated uniformity. A polyester laminating resin is disclosed for the resin base material of each layer which is activated by a small amount of diisocyanate sufficient to provide temperature stability, but insuffient to transform the base material into a urethane. Also disclosed is an electroluminescent lamp which emits light only in discrete areas such as to produce a pattern of light in which the phosphor is applied in a pattern corresponding to the discrete areas which are to be illuminated. Similarly, the electrodes are restricted to the illuminated regions or areas, thereby conserving material as well as reducing the power requirements of the lamp. Also disclosed is an electroluminescent lamp in which the power leads are applied to the lamp at locations inwardly of the margin of the lamp, and a method of attaching the power leads inwardly of the lamp margins. |
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DETAILED DESCRIPTION The present invention is directed to the construction of electroluminescent panels and methods of making the same, which overcome many of the shortcomings of presently available panels.
In one aspect of the invention, each of the operative layers of a flexible electroluminescent panel is formed with a resin carrier which is compatible with that of each of the other layers in that the resin carrier of each layer has basically the same physical, chemical and electrical properties as those of the other layers.
In the preferred embodiment, each of the operative layers applied to a base material is a polyester casting resin.
As a result of using the same resin carrier in each polymer layer, the completed electroluminescent panel is homogeneous throughout all such layers with no discernible difference in the crystalline structure making up each of the layers apart from the presence of a filler material, such as phosphor, pigment, dielectrics, or metal.
Preferably, a resin is formulated employing a casting polyester of the kind described in parent application Ser.
No.
677,645, which polyester casting resin may be activated by a relatively small quantity of diisocyanate such as toluene diisocyanate.
Such resin has been found to have excellent adhesive to the polyester base sheet such as "Mylar," to which a metalized transparent electrode, such as a indium-oxide, has been applied.
Such resin material has further been found to have a high dielectric constant, providing excellent lamp brilliance, coupled with excellent moisture protection and long service life.
The quantity of toluene diisocyanate used is insufficient to form a urethane, but is advantageous in enhancing the temperature stability of the panel, and in making a resin layer which is somewhat more durable for handling purpose after curing.
However, good results have been obtained where the diisocyanate has been omitted.
In a further aspect of the invention, the electroluminescent lamp is designed to emit light only in discrete areas, for the purpose of producing a pattern of light as desired, which pattern occupies less than the full surface area of the panel
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Manufacturing Materials 
