Electroluminescent display screen with a memory and a particular configuration of electrodes

Patent 5053675 Issued on October 1, 1991. Estimated Expiration Date:

April 11, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3786307

Light sink layer for a thin-film EL display panel
Patent #: 4602189
Issued on: 07/22/1986
Inventor: Panicker

Method of making an electroluminescent display device with islands of light emitting elements
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Display means with memory effect comprising thin electroluminescent and photoconductive films
Patent #: 4808880
Issued on: 02/28/1989
Inventor: Thioulouse

Electroluminescent display device using hydrogenated and carbonated amorphous silicon
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Issued on: 10/31/1989
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Matrix screen, its production process and matrix display means with several tones, controlled on an all or nothing basis and incorporating said screen Patent #: 4924144
Issued on: 05/08/1990
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Inventor

Thioulouse, Pascal

Application

No. 508260 filed on 04/11/1990

US Classes:

313/505, With electrode matrix313/506, Plural layers313/509, With dielectric layer315/169.3, Electroluminescent device345/76, Electroluminescent345/207Light detection means (e.g., with photodetector)

Examiners

Primary: Moore, David K.
Assistant: Khanna, Rohini

Attorney, Agent or Firm

Hayes, Soloway, Hennessey & Hage

Foreign Patent References

0259213 EP. 08/25/1987

International Class

H05B 033/22

Foreign Application Priority Data

1989-04-12 FR

Abstract

Electroluminescent display screen with a memory and a particular configuration of electrodes. The display screen comprises on a nonconducting substrate a stacked electroluminescent film and a photoconductive film, both of these films being inserted between lower transparent electrodes (12) orientated along a first direction (x) and upper electrodes (22) orientated along a second direction (y) perpendicular to the first direction, the upper and lower electrodes defining at their intersection picture elements (26), the upper electrodes (22) comprising blocks (40) of dimension D along the first direction at the display points electrically interconnected by two access strips (42a, 42b) with a width d with d<D/2, the access strips at a given block being connected by a conductive access bridge (46) parallel to the lower electrodes, the edges of these blocks (40) being situated inside the edges of the lower electrodes.