Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

1981-05-05

1984-02-14

Corbin, John K.

350338, G02F 113

Patent

active

044312725

ABSTRACT:
A liquid crystal display device including an opaque reflective electrode on the lower plate of the device is provided. The surface of the electrode is a rugged surface wherein the average angle of inclination of an inclined plane passing through the inclined regions of the rugged surface is 30 degrees or less with respect to a horizontal plane coinciding with the surface of the lower plate. The area where the angle of inclination of the rugged portions is greater than 40 degrees occupies 30% or less of the surface area of the electrode. The average pitch of the rugged regions of the electrode surface is greater than 3 .mu.m and the depth of the rugged region is about 0.2 .mu.m on the average, but less than 5 .mu.m.
The opaque electrode is formed from a metal having a reflectance of 80% or more with respect to incident light entering from a direction substantially vertical to the lower plate. The electrode is preferably an aluminum electrode and the rugged surface is obtained by first depositing an insulating layer of SiO.sub.2 by CVD and selectively etching the layer of SiO.sub.2 at an angle of between 0 degrees and 30 degrees to form a rugged surface. Alternatively, the SiO.sub.2 layer is treated by plasma spray and a resist is applied thereto. A widened viewing angle for a display utilizing a polarizer and a guest-host liquid crystal or a colored liquid crystal is obtained by utilizing the rugged electrode in accordance with the invention.

REFERENCES:
patent: 3881809 (1975-05-01), Fergason et al.
patent: 4106859 (1978-08-01), Doriguzzi et al.
patent: 4126383 (1978-11-01), Doriguzzi et al.
patent: 4217035 (1980-08-01), Doriguzzi et al.
patent: 4298249 (1981-11-01), Gloor et al.

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