Displaying magnetic panel and its display device

Details Displaying magnetic panel and its display device Displaying magnetic panel and its display device

1977-12-29

1979-03-13

Skogquist, Harland S.

B43L 112

Patent

active

041434722

ABSTRACT:
A display device is disclosed which employs a magnetic panel. The magnetic panel is formed by two oppositely arranged substrates at least one of which is transparent or semi-transparent. The space between the two substrates is filled with a dispersing liquid having a yielding value higher than 5 dyne/cm.sup.2. The dispersing liquid is prepared with fine magnetic grains, a coloring agent, a dispersing medium, and a fine grain thickener. Preferably, a multi-cell structure is provided in the space between the two substrates and the substrates are sealed to the multi-cell structure to form a plurality of independent display cells. A displaying magnet in the form of a pen is used to form a display by causing the fine magnetic grains to migrate to the front of the magnetic panel. An erasing magnet is slidably disposed at the rear of the magnetic panel.

REFERENCES:
patent: RE25822 (1965-07-01), Tate
patent: 3011854 (1961-12-01), Allen
patent: 3322482 (1967-05-01), Harmon
patent: 3982334 (1976-09-01), Tate

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