Browse Prior Art Database

AC Electroluminescent Devices Having a Black Electrode

IP.com Disclosure Number: IPCOM000089154D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Gerber, UG: AUTHOR [+2]

Abstract

An AC (alternating current) electroluminescent display device with a conductive black electrode and a black dielectric provides a high contrast.

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AC Electroluminescent Devices Having a Black Electrode

An AC (alternating current) electroluminescent display device with a conductive black electrode and a black dielectric provides a high contrast.

As shown in the drawing, the display device has a glass substrate 10 with a transparent electrode 12, such as SnO(2), positioned thereon. A conventional electroluminescent sandwich layer 14, consisting of a layer of Mn-doped ZnS positioned between two layers of alpha-BaTiO(3) dielectric, is positioned on the transparent electrode 12. A black dielectric layer 16 is on the back side of the sandwich layer 14 in the nondisplay areas. A black conductive electrode 18 covers the display areas to provide a display that appears totally black when viewed without a message. These conductive black electrodes may be formed with high-line resolution using conventional silk-screen techniques.

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