Communications: electrical – Continuously variable indicating – With meter reading
Patent
1979-01-23
1982-03-30
Trafton, David L.
Communications: electrical
Continuously variable indicating
With meter reading
250209, 340719, 340781, G08B 536
Patent
active
043227201
ABSTRACT:
A display device formed as a multilayer panel. The display is built up of d.c. electroluminescent display elements arranged in cells each containing an array of elements, e.g. for the display of a character. A display element is selected and caused to start luminescing by (a) a flash of light from a cell selector d.c. electroluminescent element which lowers the resistance of a group of associated photoconductors in series with the display elements, and (b) an energizing pulse applied, in the cell in question, to one of the display elements through its photoconductor. Once initiated, luminescence is maintained by an energizing voltage applied through a photoconductor radiatively coupled to the element. The information written in a cell is selectively erased as a whole by a further flash from the cell-selector element, which reduces the voltage applied to the lit elements of the cell to the point at which luminescence ceases. The photoconductors are arranged back-to-back on either side of an opaque printed circuit board and connected to each other and the display elements by through-layer connections.
REFERENCES:
patent: 3152257 (1964-10-01), Santen et al.
patent: 3207905 (1965-09-01), Bray
patent: 3221170 (1965-11-01), Sylvander
patent: 3375373 (1968-03-01), Hageman
International Computers Limited
Trafton David L.
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