Twisted nematic liquid crystal display devices with optical axis

Details Twisted nematic liquid crystal display devices with optical axis Twisted nematic liquid crystal display devices with optical axis

1993-06-24

1994-12-20

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, G02F 11335

Patent

active

053750063

ABSTRACT:
The disclosure relates to electrically controlled display devices that use the polarization rotation properties of twisted nematic liquid crystal layers. A display device comprises an optical cavity formed by two polarizers enclosing a layer of twisted nematic liquid crystal with which uniaxial birefringent means are associated in order to compensate for the residual birefringence of the liquid crystal layer which tends to reduce the contrast ratio of the display device. Thus, the homogeneity of the angular distribution of the contrast ratio is improved in relation to a device having no compensating means. The disclosed device can be applied in particular to data display devices for computers and to the display of television pictures directly or by projection.

REFERENCES:
IBM Technical Disclosure Bulletin, vol. 33, No. 12, May 1991, pp. 201-202. "Multicolor Parallel-Oriented Nematic Liquid Crystal Displays Using Optical Compensation Films".

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