Modulation element comprising a mesogenic modulation medium having a cybotactic nematic phase that shows two distinct electro-optical transitions at one single temperature
AssigneeMerck Patent GmbH
InventorsDagmar Klement, Atsutaka Manabe, Nobuo Kubo
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Abstract
The present invention relates to modulation elements for electromagnetic radiation and to modulation devices and systems comprising these devices, such as e.g. television screens and computer monitors, as well as to micrometer wave components. The modulation elements according to the invention comprise a mesogenic modulation medium with a dielectric anisotropy, which shows two or more distinct transitions upon application of an electric field. The mesogenic modulation media used in the modulation elements for electromagnetic radiation are also a subject of the present invention.
Claims27
A modulation element for electromagnetic radiation comprising
- an electrode arrangement, and
- a mesogenic modulation medium,
- wherein
- the mesogenic modulation medium has a positive dielectric anisotropy and a cybotactic nematic phase, and
- the modulation element provides modulation with an operational temperature range and there is at least one single temperature within said operational temperature range at which said modulation element shows two or more distinct electro-optical transitions.
A mesogenic modulation medium wherein said modulation medium has a positive dielectric anisotropy and a cybotactic nematic phase, and
- the mesogenic modulation medium provides modulation with an operational temperature range and there is at least one single temperature within said operational temperature range at which said mesogenic modulation medium shows two or more distinct electro-optical transitions.
A modulation element for electromagnetic radiation comprising
- an electrode arrangement, and
- a mesogenic modulation medium,
- wherein
- the mesogenic modulation medium has a positive dielectric anisotropy, an elastic constant k3 of 100 pN at at least one of the operation temperatures of the modulation element, and a cybotactic nematic phase, and
- the modulation element shows two or more distinct electro-optical transitions at a temperature of 20° C.
A modulation element for electromagnetic radiation comprising
- an electrode arrangement, and
- a mesogenic modulation medium,
- wherein
- the mesogenic modulation medium has a positive dielectric anisotropy and a cybotactic nematic phase, and
- when applying voltage to said modulation element in an increasing manner and then a decreasing manner, said modulation element shows at a first operating temperature a first distinct electro-optical transition when voltage is increasing, and shows at that same first operating temperature a second distinct electro-optical transition when voltage is decreasing.
Dependencies are inferred from the claim text.