Browse Prior Art Database

Electroluminescent Display

IP.com Disclosure Number: IPCOM000098227D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Bagley, JD: AUTHOR

Abstract

Sixteen blue emitting electroluminescent lamp segments 1-16, each having three associated photoconductors sensitive respectively to red, white and blue light, combine to form an EL PC universal character display which is selectively settable from the rear under machine control and capable of being brought up to date from the front by the operator.

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Electroluminescent Display

Sixteen blue emitting electroluminescent lamp segments 1-16, each having three associated photoconductors sensitive respectively to red, white and blue light, combine to form an EL PC universal character display which is selectively settable from the rear under machine control and capable of being brought up to date from the front by the operator.

Characters, made up of combinations of segments selectively made luminant, are viewed through a glass front support plate. A transparent conductive inner face of the plate forms a common electrode for the EL segments. Each segment is otherwise electrically and optically separate from the other segments. Illustrative segment 7, shown in the cutaway, includes a pattern of blue emitting EL phosphor which is transparent to blue light. Behind the EL pattern is a similar pattern of blue-sensitive PC material regeneratively coupled to the blue EL to form an EL-PC latch. The EL pattern produces a blue light when an A.C. voltage of suitable potential is impressed across it.

The PC pattern abuts an opaque shield electrode and a white PC pattern which is electrically in series with the blue EL and in parallel with the blue PC. The white PC is illuminated by the incandescent lamp when proper plug connectors are electrically energized. Power is applied via plug connectors across the pattern PC's which form voltage dividers with the EL. Illumination of the white PC by the incandescent lamp raises the effect...