Compound indicator device containing at least one liquid crystal

Details Compound indicator device containing at least one liquid crystal Compound indicator device containing at least one liquid crystal

1977-05-18

1979-01-30

Sacher, Paul A.

350336, 350339, G02F 113

Patent

active

041369327

ABSTRACT:
An indicator device which has two sealed chambers which are formed by at least one carrier member interposed between a pair of glass plate members to provide a tandem arrangement in the direction of travel of light in the device, characterized by at least one of the chambers containing a liquid crystal layer and being provided with transparent conductive material on the walls thereof to form a liquid crystal cell. In one embodiment, each conductive layer of each cell is separated in two parts by a continuous interruption in the layer so by selectively applying voltage to different parts, at least four different symbols or shapes can be indicated. In a second embodiment, the conductive layers of each cell are arranged as a segment electrode pattern with the segment being subdivided into partial segments with one partial segment being in one cell and the remaining partial segment in the second cell to enable determining errors in actuation of various segments during an indication. In a third embodiment, the liquid crystal cells are arranged in tandem one behind the other so that either by separately actuating the electrodes of each cell a sign or symbol can be produced without undesirable cross points or by sequentially activating the electrodes of each cell, a partial image can be produced in each cell to create a moving image on the device. In the fourth embodiment, one of the cells is provided with a reflective layer by either depositing from a silver-ammonium complex or by printing with a silver compound onto a surface of the chamber to provide a reflecting chamber which enables operation of the remaining cells in a reflective mode.

REFERENCES:
patent: 3820875 (1974-06-01), Bohmer
patent: 3903519 (1975-09-01), Zega
patent: 3938134 (1976-02-01), Hackstein

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