Hans-Rolf Dubal | Researchain

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Featured researches published by Hans-Rolf Dubal.

Liquid Crystals | 1999

Material characteristics of an active matrix LCD based upon chiral smectics

Toshiaki Nonaka; Ji Li; Ayako Ogawa; Barbara Hornung; Wolfgang Schmidt; Rainer Wingen; Hans-Rolf Dubal

We describe the material properties of a fast switching active matrix ferroelectric liquid crystal mode. The mode relies on a monostable monodomain having a high transmission and full grey scale capability. Experimental data are compared with the results of switching model calculations and the switching mechanism is discussed. The mode is suitable for video and multimedia application and compatible with conventional amorphous silicon thin film transistors due to the small value of the spontaneous polarization.

Archive | 2000

Active matrix displays having high contrast values

Hans-Rolf Dubal; Toshiaki Nonaka; Rainer Wingen

Archive | 1988

Use of compounds or mixtures of compounds which have a chiral, orthogonal, more highly ordered smectic phase in the range of said phase as switching or indicating medium

Christian Bahr; Gerd Heppke; Detlef Lötzsch; Hans-Rolf Dubal; Claus Dr Escher; Dieter Ohlendorf

Archive | 2002

Active matrix liquid crystal device and smectic liquid crystal mixture

Haruki Amakawa; Toshiaki Nonaka; Hans-Rolf Dubal; Rainer Wingen

Archive | 1993

Use of optically active tetrahydrofuran-2-carboxylic acid esters as dopants in liquid-crystal mixtures, liquid-crystal mixtures containing same and novel optically active tetrahydrofuran-2-carboxylic acid esters

Wolfgang Hemmerling; Hans-Rolf Dubal; Claus Escher; Gerhard Illian; Yoshio Inoguchi; Ingrid Muller; Mikio Murakami; Dieter Ohlendorf; Rainer Wingen

Archive | 1990

Ferroelectric liquid crystal display having gray steps or a continuous gray scale

Hans-Rolf Dubal; Claus Escher; Gerhard Illian; Mikio Murakami; Dieter Ohlendorf

Archive | 1988

Liquid crystalline cyclopropyl alkyl or alkenylhetero rings, process for their preparation and their use in liquid-crystal mixtures

Meijere Armin Prof. Dr. De; Hans-Rolf Dubal; Claus Escher; Wolfgang Hemmerling; Ingrid Muller; Dieter Ohlendorf; Rainer Wingen

Archive | 1987

Chiral aryl-2,3-epoxy alkyl-ether and its corresponding thio compound and their use as dopants in liquid crystalline phases

Wolfgang Hemmerling; Hans-Rolf Dubal; Ingrid Muller; Dieter Ohlendorf; Rainer Wingen

Archive | 1987

Chiral aryl-2,3-epoxyalkyl-ethers and the corresponding thio compounds thereof, and the use thereof as dopes in liquid-crystal phases

Wolfgang Hemmerling; Hans-Rolf Dubal; Ingrid Muller; Dieter Ohlendorf; Rainer Wingen

Archive | 1990

Electrically conductive polymers and their use as orienting layer in liquid-crystal switching and display elements

Claus Escher; Hans-Rolf Dubal; Michael Feldhues; Takamasa Harada; Gerhard Illian; Thomas Mecklenburg; Mikio Murakami; Dieter Ohlendorf; Karl Dr. Pampus

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