Patent
1975-01-29
1977-10-18
Corbin, John K.
G02F 113
Patent
active
040543684
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 one liquid crystal cell is a rotation cell and the other is a DAP cell which cells can be activated to give multi-colored indications. In a second embodiment of the invention, one of the cells is a rotation cell and the other is a polarizing cell which enables giving a colored indication on a colored background or a white indication on a black background. In a third embodiment, both cells are rotational cells with a different angle of rotation and the carrier member consists of a birefringent material which enables indications of at least four different colors. In a fourth 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 fifth embodiment, each of the cells is a rotational cell of approximately 45.degree. and the electrode pattern of each cell is a matrix of strips extending perpendicular to each other so that the time required for indicating an image on the device is reduced. In a sixth 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 seventh 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 eighth 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. In a final embodiment, an electrochemical luminescence layer is provided in one cell to provide an illuminating background for indications produced on the other cell.
REFERENCES:
patent: 3807831 (1974-04-01), Soref
patent: 3897137 (1975-07-01), Dobbins
Sato, S., Wada, M. "Liquid-Crystal Color Display . . . " IEEE Trans. on Elec. Devices, May 1974, pp. 312-313.
Scheffer, T., "New Multicolor Liquid Crystal Displays . . . " J. Appl. Phys. vol. 44, No. 11, Nov. 1973, pp. 4799-4803.
Shanks, I., "Liquid Crystal Materials and . . . " Electronic Engineering, Aug. 1974, pp. 30-37.
Krueger Hans
Welsch Wolfgang
Corbin John K.
Hille Rolf
Siemens Aktiengesellschaft
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