Multi-colored display device

Details Multi-colored display device Multi-colored display device

Filed on

1978-02-16

Date issued

1980-12-23

Examiner

Trafton, David L.

Patent Class

Communications: electrical

SubClass

Land vehicle alarms or indicators

SubSubClass

Internal alarm or indicator responsive to a condition of the...

Other Related Categories

340784, 350331R, 350335, 350349, G09F 935

Type

Patent

Status

active

Patent number

042413397

Description

ABSTRACT:
Multi-colored display devices comprising layered liquid crystal display cells are provided. The multi-colored display devices include a first polarizing plate, a first liquid crystal display cell of the twisted nematic type having an optical activity of about 90.degree. disposed adjacent to the polarizing plate and at least one liquid crystal display cell of the guest-host type containing a dye disposed adjacent to the first display cell. In the guest-host display cell the liquid crystal and dyes are oriented parallel to the polarizing axis of the polarizing plate. The multi-colored display device includes an auxiliary color source which may be a colored polarizing plate disposed on the surface of the device opposed to the first polarizing plate with the axis of polarization of the colored polarizing plate perpendicular to the axis of polarization of the first polarizing plate or an additional liquid crystal cell of the guest-host type including a different dye.

REFERENCES:
patent: 3569614 (1971-03-01), Hanlon
patent: 3897137 (1975-07-01), Dobbins
patent: 3967881 (1976-07-01), Moriyama et al.
patent: 4097130 (1978-06-01), Cole
Kobayashi and Takeuchi; Multicolor Field-Effect Display Devices with Twisted Nematic Liquid Crystals; undated, 2 pp.
T. J. Scheffer; Liquid Crystal Color Displays, Brown Boveri Symposium on Nonemissive Electro Optic Displays; Sep. 29-30, 1975, 34 pp.

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