Nemoptic

Dic Corporation

France Brevets

Daniel Stoenescu

Ivan N Dozov

Philippe Martinot-Lagarde

Jean-Claude Dubois

Haruyoshi Takatsu

Kiyofumi Takeuchi

Hidetoshi Nakata

Didier Gallaire

Alexandre Carton

Patrice Davi

Takeshi Kuriyama

Jacques Angele

Cécile Joubert

Stéphane Joly

Romain Vercelletto

Jean Claude Dubois

Stephane Joly

Ivan Dozov

The present invention provides a nematic liquid crystal composition suitable for a bistable nematic liquid crystal display. A bistable nematic liquid crystal display having a wide nematic phase temperature range and operating temperature range can be obtained by using a nematic liquid crystal composition comprising at least 20% by weight of a specific liquid crystal compound (A) having a polar group and 5 to 50% by weight of a specific liquid crystal compound (B) not having a polar group, along with comprising, in the compound (B), at least 3% by weight of a specific liquid crystal compound having a alkenyl group.

Nematic liquid crystal composition and bistable nematic liqud crystal display

A nematic liquid crystal composition of the present invention includes at least 20% by weight of one, or two or more compounds selected from compound group A; and 5 to 50% by weight of one, or two or more compounds selected from compound group B, wherein the relative proportions of the above-mentioned compounds used in the nematic liquid crystal composition is determined to simultaneously obtain the specific physical characteristics for the composition, and an anchoring breaking voltage Uis less than or equal to 25 V when the product (&#x394;n&#xb7;d) of the refractive index anisotropy (&#x394;n) at 20&#xb0; C. and the thickness (d) is 140 nm and the liquid crystal composition is confined between two substrates for a bistable nematic liquid crystal display in which at least one of the substrates have a weak zenithal anchoring force.

Nematic liquid crystal composition and bistable nematic liquid crystal display

A device nematic liquid crystal display device has two stable states corresponding to two liquid crystal molecule textures whose torsion differs by 150&#xb0; to 180&#xb0; in terms of absolute value. The device includes two polarizers (), one () of which is placed on the observer side, the other () being placed on the opposite side of the liquid crystal cell. The orientation of the two polarizers is offset by a value which is equal to the rotatory power of the cell+/&#x2212;&#x3a0;/2, the rotatory power corresponding to the most twisted texture effect.

Display device with a black-optimizing bistable nematic screen and method for the definition of said device

The invention relates to a nematic liquid crystal display having two stable states, without an electric field, obtained by anchoring break, characterized in that it comprises two polarizers (), one () of which is placed on the observer side, the other () being placed on the opposite side of the liquid crystal cell whereby the latter is at least partially reflecting in order to define a reflective mode or transflective mode. The orientation of the two polarizers () is offset by a value which is equal to the rotatory power of the cell at approximately +/&#x2212;30&#xb0;.

Display device with a white-optimizing bistable nematic screen and method for the definition of said device

A method of using a liquid crystal composition in a bistable liquid crystal device having a weak zenithal anchoring comprising at least 40% by weight of compounds with strong molecular polarisability and strong dipole moment.

Nematic liquid crystal mixtures for use in bistable display devices

The present invention relates to a nematic bistable display device, characterized in that it comprises control means () for producing, after the anchoring is broken, hybrid textures in which two bistable textures coexist in a controlled proportion within the same pixel, these being separated by 180&#xb0; volume disclination lines or by 180&#xb0; reorientation walls on one of the surfaces, and means () for the long-term stabilization of the hybrid textures by transformation of the volume lines into surface walls and the immobilization of these walls on the surface.

Nematic liquid crystal bistable display device with grey level

Nematic liquid crystal mixtures with weak zenithal anchoring energy for bistable display devices, comprising at least 40% by weight of compounds with strong molecular polarisability and strong dipole moment.

Nematic liquid crystal mixtures for bistable display device

The present invention relates to a reflective liquid crystal display device comprising a liquid crystal material ( ) contained between two parallel substrates ( ) provided with aligning means on the electrodes to orient the liquid crystal and enable at least two alternative distinct textures that are stable or metastable in the absence of a field to be obtained, means for applying electrical signals to the liquid crystal to perform switching by enabling anchoring on at least one of the two substrates to be broken, a polarizer ( ) associated with the front face of the device and oriented at an angle lying in the range 15&deg; to 75&deg; relative to the director of the liquid crystal on the front face of the device, and a specular or diffusing reflective element ( ) placed at the rear face of the liquid crystal.

Reflective bistable display device incorporating a liquid crystal material

The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer ( ) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator ( ), placed between the polarizer and the reflective element, with an optical retardation d &Dgr;n close to &lgr; /4.

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Orsay, France

Daniel Stoenescu