Browse Prior Art Database

Low Leakage Structures for Storage CRT with Electroluminescent Faceplate

IP.com Disclosure Number: IPCOM000084346D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Barrekette, ES: AUTHOR [+3]

Abstract

One of the difficulties that may be encountered in the electroluminescent phosphor storage display of Chang and Pennebaker, as described in U. S. Patent 3,796,909, resides in the fact that the target may exhibit electrical leakage, both through the active electroluminescent layer and across the boundaries between the difference states, i.e., between the "on" and "off" regions.

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Low Leakage Structures for Storage CRT with Electroluminescent Faceplate

One of the difficulties that may be encountered in the electroluminescent phosphor storage display of Chang and Pennebaker, as described in U. S. Patent 3,796,909, resides in the fact that the target may exhibit electrical leakage, both through the active electroluminescent layer and across the boundaries between the difference states, i.e., between the "on" and "off" regions.

The figure shows an island-type electroluminescent target structure and underlying insulating layer arranged to alleviate any leakage problem. As shown, the electroluminescent target is divided into an array of islands arranged upon a continuous layer of insulating material. In this regard, any of a variety of well- known insulating materials may be employed. The insulating layer is deposited upon the transparent conductor of the cathode-ray tube (CRT) faceplate. Typically, SnO(2) is utilized as the transparent conductor. As is evident, by dividing the electroluminescent layer into islands, there is some loss of active area and some increase in manufacturing complexity.

By extending the photolithographic process, the collector mesh, which is normally adjacent the layer of electroluminescent material, may be integrated onto the target assembly as an evaporated metal layer. With appropriate photolithographic processing and etching, the metal layer may be made into the required metal collector grid within the same plane o...