High contrast liquid crystal display devices

Details High contrast liquid crystal display devices High contrast liquid crystal display devices

1983-03-29

1985-07-09

Corbin, John K.

350349, G02F 1133

Patent

active

045278644

ABSTRACT:
A liquid crystal display device having high extinction ratio polarizers on the input and output sides of a transmissive, twisted nematic liquid crystal cell. The liquid crystal cell incorporating a dichroic dye which is admixed with the liquid crystal material. The high extinction ratio polarizers get the full contrast and density capability from the liquid crystal cell while the dichroic dye prevents the buildup of the contrast limiting orthogonal mode of the polarized light passing therethrough, thus, further increasing the optical contrast and density. Such an arrangement provides optical contrasts of around 150:1 with a 10 micron thick liquid crystal cell.

REFERENCES:
patent: 3597044 (1971-08-01), Castellano
patent: 3963312 (1976-06-01), Wild
patent: 4211473 (1980-07-01), Shanks
patent: 4288147 (1981-09-01), Koch
patent: 4391730 (1983-07-01), Kuschel et al.
Voltage-Dependent Optical Activity of a Twisted Nematic Liquid Crystal by M. Schadt and W. Helfrich from Applied Physics Letters, Feb. 15, 1971, vol. 18, No. 4, pp. 127-128.
Optimum Polarizer Combination for Twisted Nematic Displays by T. J. Scheffer and J. Nehring from IEEE Transactions on Electronic Devices, Jul. 1977, vol. ED-24, No. 7, pp. 816-822.
Optical Characteristics of Twisted Nematic Liquid Crystal Films by C. H. Gooch and H. A. Tarry from Electronics Letters, Jan. 10, 1974, vol. 10, No. 1, pp. 2-4.
Guest-Host Interactions in Nematic Liquid Crystals, A New Electro-Optic Effect by G. H. Heilmeier and L. A. Zanoni from Applied Physics Letters, Aug. 1, 1968, vol. 13, No. 3, pp. 91-92.
New Absorptive Mode Reflective Liquid Crystal Display by D. L. White and G. N. Taylor, from Journal of Applied Physics, Nov. 1974, vol. 45, pp. 4718-4723.
U.S. Application Serial No. 420,963 to John W. Daughton, filed Sep. 21, 1982.

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