Merck Patent Gesellschaft MIT Beschrankter Haftung

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Siemens Aktiengesellschaft

Merck Patent Gesellschaft

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Gunter Baur

Waltraud Fehrenbach

Rudolf Kiefer

Friedrich Windscheid

Barbara Weber Ne Staudacher

Bernhard Scheuble

Georg Weber

Peter Schlotter

Hans Kruger

Waldemar Greubel

Alois Schauer

Lutz Pickelmann

Jorg Seibel

Bernd Scheuble

Barbara Weber Nee Staudacher

Heinz Strinitz

Uta Weinberg

An electro-optical display device comprising a liquid crystal layer achieves switching using an electric field component which is predominantly parallel to the surface of the liquid crystal layer. Low dependence of image contrast on viewing angle is achieved by selection of parameters including pretilt angle &#x3b1;, orientation angle &#x3b2;, etc. of the liquid crystal molecules in the layer.

LC display device with parallel field component

An electro-optical display device comprising a liquid crystal layer achieves switching using an electric field component which is predominantly parallel to the surface of the liquid crystal layer. Low dependence of image contrast on viewing angle is achieved by selection of parameters including orientation angle .beta..sub.o, and others, of the liquid crystal molecules in the layer.

Liquid crystal display devices having a parallel electric field and

An electro-optical display device comprising a liquid crystal layer achieves switching using an electric field component which is predominantly parallel to the surface of the liquid crystal layer. Low dependence of image contrast on viewing angle is achieved by selection of parameters including pretilt angle .alpha..sub.0, orientation angle .beta..sub.0, etc. of the liquid crystal molecules in the layer. Reflection mode devices are described.

Reflection mode liquid crystal display devices having a parallel

Electrochromic light valve and method of manufacturing it as well as its

An electro-optical display device comprising a liquid crystal layer achieves switching using an electric field component which is predominantly parallel to the surface of the liquid crystal layer. Low dependence of image contrast on viewing angle is achieved by selection of parameters including orientation angle .beta..sub.o and pretilt angle .alpha..sub.o of the liquid crystal molecules in the layer. For example, good results are achieved when 0.degree.&lt;.beta..sub.o .ltoreq.20.degree. for liquid crystal molecules having negative dielectric anisotropy and 70.degree..ltoreq..beta..sub.o &lt;90.degree. for molecules having positive dielectric anisotropy. Preferably, 0.degree..ltoreq..alpha..sub.o &lt;30.degree..

Liquid crystal switching elements having a parallel electric field and

The invention relates to an electrooptical display element which can be multiplexed, has two support plates which, with an edging, form a cell containing a pneumatic liquid crystal material with positive dielectric anisotropy, and at least one chiral additive, and has a small surface tilt angle and a twist angle with a value between 150.degree. and 250.degree., wherein the ratio of the elastic constants for bending and twisting K.sub.3 /K.sub.2 of the liquid crystal material and the twist angle are such that when using liquid crystal material with the ratio of the elastic constants K.sub.3 /K.sub.1 for mending and spreading, which is in the order of the maximum possible, the steepness of the characteristic line is approved by the characteristic line is bi-stable or when using liquid crystal material with the ratio of the elastic constants K.sub.3 /K.sub.1 for bending and spreading either small enough or of the smallest order possible, the steepness of the characteristic line is improved but the characteristic line remains stable. The invention furthermore relates to a corresponding supertwist cell.

Electrooptical display element using a supertwist liquid crystal having

Projection device

A suitable choice of the liquid crystal parameters K.sub.3 /K.sub.1 and .DELTA.E/E.sub.1 makes it possible in electrooptical display elements to obtain both a minimum dependence on the angle of observation and, simultaneously, a steep electro-optical characteristic when operated in the first transmission minimum.

Electro-optical display element

Liquid crystalline dielectrics having steep characteristic curves comprise 5-85% by weight of at least one carboxylic acid ester of formula (I)

Liquid-crystalline dielectric having a steep characteristic curve

A display device having a liquid crystal cell containing a medium, which can be switched zone-wise between at least two different optical states to form a light valve, a light trap in the form of a plate-shaped body disposed behind the liquid crystal cell when taken in a direction of observation of the device, the plate-shaped body having a material with an index of refraction greater than 1, containing fluorescent particles, and possessing a light emergent or outlet window at the rear of each switchable zone of the liquid crystal cell characterized by the light emergent or outlet windows comprising a groove in the plate and a light scattering surface disposed between the groove and the medium of the liquid crystal cell. Preferably, the grooves of each of the windows is disposed in a rear surface or side of the fluorescent plate and the scattering surface is arranged on a front surface of the plate and can either be formed by a pigment layer which has been silk screened on the front surface or a rough surface zone which has been embossed on the front surface.

Display device comprising a liquid crystal cell with light valves

Growing community of inventors

Freiburg, Germany

Gunter Baur