Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

1974-09-05

1976-03-16

Bauer, Edward S.

350150, G02F 113

Patent

active

039443310

ABSTRACT:
A liquid crystal display device having a series of transparent panels, the inner surface of each panel successively supporting a transparent electrode film and an alignment film which sympathetically aligns crystals of liquid crystal material into the direction of film growth. The alignment films have their directions of alignment alternately pointing in the horizontal or vertical direction. Liquid crystal material is placed between adjacent alignment films to form a series of liquid crystal display cells. A character may be formed by certain transparent electrodes in the device. To read out a selected character from the device, the liquid crystal display device is placed between a light polarizer and a light analyzer. With an even number of cells in the device, the polarizer and analyzer are crossed to produce a dark background. The crystals of the unenergized cells, having crossed alignment films in them, will rotate polarized light which is passing through them by 90.degree.. When a voltage is applied across one of the cells, the crystals in that cell will not rotate polarized light passing through the area of a character in that cell. However polarized light will continue to be rotated by the remainder of that cell. The polarized light passing through the area of the character of the energized cell is 90.degree. out of phase with the other light passing through the device. Therefore only the light in phase with the analyzer will pass through the analyzer. Any character in the device may be displayed by energizing its corresponding cell.

REFERENCES:
patent: 3067413 (1962-12-01), Fischle et al.
patent: 3622224 (1971-11-01), Wysocki et al.
patent: 3700306 (1972-10-01), Cartmell et al.
patent: 3701122 (1972-10-01), Geusic et al.
patent: 3834792 (1974-09-01), Janning

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