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Field Effect Viewing Storage Panel Configuration with High Resolution Capabilities

IP.com Disclosure Number: IPCOM000081545D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Pennington, KS: AUTHOR [+2]

Abstract

One of the difficulties encountered in conventional field-effect electroluminescent viewing screens, resides in the fact that resolution is limited by constraints imposed upon the spacing of the electrodes. Typically, electrode spacings of several times greater than the thickness of the electroluminescent layer are required, in order to avoid luminescence due to the voltage drop across the electroluminescent material present between the electrodes.

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Field Effect Viewing Storage Panel Configuration with High Resolution Capabilities

One of the difficulties encountered in conventional field-effect electroluminescent viewing screens, resides in the fact that resolution is limited by constraints imposed upon the spacing of the electrodes. Typically, electrode spacings of several times greater than the thickness of the electroluminescent layer are required, in order to avoid luminescence due to the voltage drop across the electroluminescent material present between the electrodes.

A technique is proposed whereby the series resistance between adjacent electrodes may be increased, thereby allowing a reduction in the spacing of these electrodes to achieve increased resolution. In particular, close spacing of electrodes is achieved by fabricating an electrode structure which comprises linear electrodes deposited at the bottom of high aspect ratio grooves, etched or otherwise machined in a transparent substrate. Thus, the metallurgy of the display is first deposited at the bottom of the grooves, and then the electroluminescent phosphor is deposited over the metallurgy to further partially fill the grooves. A ZnO or CdO semiconductor film is then deposited over the electroluminescent phosphor, to a depth sufficient to give a potentially continuous conductive path between adjacent electrodes.

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