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LCD

Liquid-crystal-lenses-having-a-Fresnel-lens

Polymers of tricyclo[5.2.1.0.sup.2,6 ]deca-8-yl (meth)acrylate

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Method of forming a conductive and reflective thin metal film suitable for a reflective LCD device and a device produced by the method

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Liquid crystal lenses having a Fresnel lens

Details

Inventors: Okada, Takao; Shimazu, Hisanari; Toda, Akitoshi; Sato, Susumu;
Assignee: Olympus Optical Co., Ltd. (JP)
Primary Examiner: Miller; Stanley D.
Assistant Examiner: Duong; Tai V.
Attorney, Agent or Firm: Weinstein; Louis

A liquid crystal lens includes a liquid crystal cell formed by lens component members, at least one of the lens component members being formed of a Fresnel lens whose surface is formed by a number of annular ring-shaped Fresnel grooves with their crests leveled.

DETAILED DESCRIPTION It is an object of the present invention to provide liquid crystal lenses which eliminate the disadvantage of a liquid crystal lens employing the above described conventional Fresnel lens and which have a good response characteristic, especially at the central area of the lens.
According to the present invention, a liquid crystal cell can be reduced in thickness when a Fresnel lens with the groove crests leveled is employed in a liquid crystal cell for forming a liquid crystal lens.
Consequently, it is possible to reduce the response and recovery time of the liquid crystal lens when a voltage is applied thereto, which has a variable focal length and a rapid response characteristic.
Further, an amount of liquid crystal to be charged in the cell is reduced and thus an inexpensive liquid crystal lens can be obtained.

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