Operational method for displaying images with liquid-crystal ele

Details Operational method for displaying images with liquid-crystal ele Operational method for displaying images with liquid-crystal ele

1975-12-01

1978-11-21

Corbin, John K.

350333, G02F 113

Patent

active

041263820

ABSTRACT:
An operational method is disclosed for the display of images by an electro-optical device comprising a liquid-crystal cell inserted between two polarizing devices, means being provided for impressing on the liquid crystal electric pulses, the improved method comprising the step of applying a pulsed energization, each pulse being any voltage waveform having a duration and an RMS amplitude such as to originate, at each pulse, a cell luminous response and not exceeding 1.3 times those which are required to produce a flash of light with a peak amplitude which cannot be further increased without causing more than one peak to appear. In the case of repetitive energization, the pulse repetition period, under steady conditions, shall be such that at the end of the period, the luminous response of the cell falls irreversibly to a value which is not more than one half of that peak value corresponding to "white level". The liquid crystals which are of interest for the invention are the nematic liquid crystals having a negative dielectric anisotropy and a substantially homeotropic alignment. The invention aims at doing away with certain defects of the prior art devices, such as too long energization and extinguishing times and reduced angle of vision.

REFERENCES:
patent: T544596 (1966-04-01), Oliver
patent: 3694053 (1972-09-01), Kahn
patent: 3700306 (1972-10-01), Cartmell et al.
patent: 3756694 (1973-09-01), Soref et al.
Schiekel et al., "Deformation of Nematic Liquid Crystals . . . ", Applied Physics Letters, vol. 19, No. 10, pp. 391-393, Nov. 15, 1971.
Jakeman et al., "Electro-Optic Response Times in LC", Physics Letters, vol. 39A, No. 1, Apr. 10, 1972, pp. 69-70.
Hareng et al., "LC Matrix Display . . . ", Proceedings of IEEE, Jul. 1972, pp. 913-914.

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