Picture display cell with memory effect

Details Picture display cell with memory effect Picture display cell with memory effect

1976-10-28

1978-09-26

Mack, John H.

Chemistry: electrical and wave energy

Apparatus

Coating, forming or etching by sputtering

204242, 252408, G02F 123, G03G 1600, C09K 300

Patent

active

041165357

ABSTRACT:
The invention relates to an image display cell in which a 4,4'-bipyridinium compound is used as a reduceable redox material. According to the invention said redox material is dissolved in a cell medium which contains a mixture of water and an electrochemically inert organic solvent. A suitable organic solvent is, for example, dimethyl sulfoxide. As a result crystallization of the solution takes place only at temperatures far below 0.degree. C so that the picture display cell can also be used at lower temperatures. The 4,4'-bipyridinium compound may be so chosen that the resulting picture can be erased directly electrochemically without the use of an auxiliary couple.

REFERENCES:
patent: 3806229 (1974-04-01), Schoot et al.
patent: 3854794 (1974-12-01), Vandam et al.
patent: 3912368 (1975-10-01), Ponjee et al.
patent: 3930717 (1976-01-01), McDermott et al.
patent: 3950077 (1976-04-01), Jasinski

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