Liquid crystal optical devices enabling high frequency ac excita

Details Liquid crystal optical devices enabling high frequency ac excita Liquid crystal optical devices enabling high frequency ac excita

1987-05-14

1988-10-04

Miller, Stanley D.

350332, 350346, 350347E, G02F 113

Patent

active

047752246

ABSTRACT:
A method applicable to a liquid crystal cell comprising two parallel transparent plates (11, 12) coated on their facing inert faces with electrode-forming conductive coatings (14,15), and with a shim (13) interposed between the plates, the space in said cells between said plates containing a substance (17) including molecules which are endowed with nematic properties, wherein: controlled variations in surface impedance are defined on at least one of the electrode coatings in selected zones (16) thereof; and a variable frequency excitation electrical voltage is applied between the electrodes (14, 15) provided on respective ones of said plates (11, 12), and voltage being selected to be suitable for producing alternately an electric field extending normally to the electrodes and an electric field which slopes relative to the normal to said electrodes at said zones (16) having a controlled impedance variation.

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"Surface-Stabilized Ferroelectric Liquid Crystal Electro-Optics: New Multistate Structures and Devices", by N. Clark et al., Ferroelectrics, (1984), vol. 59, pp. 25-67.

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