Spectacle lens having continuously variable controlled density a

Details Spectacle lens having continuously variable controlled density a Spectacle lens having continuously variable controlled density a

1980-03-25

1981-07-21

Bauer, Edward S.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350334, 350332, 351 41, 351 44, G02F 1133

Patent

active

042794749

ABSTRACT:
A spectacle lens comprises a liquid crystal layer and electrode assembly sandwiched between a pair of identically curved glass plates and layers of polarization material on the outer surfaces of the plates. The optical density of the lens is controlled by applying across the electrodes variable duty cycle voltage pulses having a magnitude greater than a threshold voltage of the liquid crystal layer and a frequency at least as great as the critical flicker fusion frequency of the eye. The duty cycle of the pulses is controlled in response to ambient light intensity measured by a photocell. In order to reduce response time and increase operating lifetime of the liquid crystal layer, tir-level (+V, 0, -V) rather than bilevel (+V, 0) pulses may be applied to the liquid crystal electrodes.

REFERENCES:
patent: 3815982 (1974-06-01), Wagensonner
patent: 3886014 (1975-05-01), Bayer
patent: 3942270 (1976-03-01), Hoyt et al.
patent: 3975726 (1976-08-01), Kawakami
patent: 4021935 (1977-05-01), Witt
patent: 4037929 (1977-07-01), Bricot et al.
patent: 4039803 (1977-08-01), Harsch
patent: 4066335 (1978-01-01), Courtney et al.
patent: 4106217 (1978-08-01), Witt
patent: 4181408 (1980-01-01), Sendees
patent: 4190330 (1980-02-01), Berreman
Kaneko et al., "Liquid Crystal Television Display", Proceeding of the S.I.D., vol. 19/2, pp. 49-54, Apr. 1978.

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