Liquid crystal lenses having a Fresnel lens
First Claim
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1. A liquid crystal lens including a cell formed by lens component members, each being uniformly coated with a transparent conductive layer, and in which a liquid crystal is charged, at least one of said lens component members having a Fresnel lens surface, characterized in thata number of annular ring-shaped Fresnel grooves forming said Fresnel lens surface are formed by leveling their crests and troughs with a uniform depth.
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Abstract
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.
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8 Claims
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1. A liquid crystal lens including a cell formed by lens component members, each being uniformly coated with a transparent conductive layer, and in which a liquid crystal is charged, at least one of said lens component members having a Fresnel lens surface, characterized in that
a number of annular ring-shaped Fresnel grooves forming said Fresnel lens surface are formed by leveling their crests and troughs with a uniform depth.
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3. A liquid crystal lens including a cell formed by lens component members which are uniformly coated with a transparent conductive layer, and in which a liquid crystal is charged, at least one of said lens component members having a Fresnel lens surface, characterized in that
a number of annular ring-shaped Fresnel grooves forming said Fresnel lens surface are of equal height, the height of said grooves being measured in the direction of the central axis of the Fresnel lens.
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4. A liquid crystal lens including a cell formed by lens component members in which a liquid crystal is charged, at least one of said lens component members having a Fresnel lens surface, characterized in that
a number of annular ring-shaped Fresnel grooves forming said Fresnel lens surface are formed by leveling their crests, the crests in the Fresnel lens surface facing the liquid crystal lying in a common plane so that at least a center crest is closer to the surface of the remaining one of said lens component members than the other crests of the Fresnel lens to reduce the response time of the liquid crystal in the region of the center crest by a reduction amount at least as much as the response time of the liquid crystal in the regions of the crests moving toward the periphery of the lens.
Specification