Ion bombardment-induced transformation process on SiN x  surfaces to achieve vertical alignment of liquid crystal molecules

Light leakage from liquid crystal displays in the dark state is relatively larger and leads to a degraded contrast ratio and color shift. This work describes a novel colorimetric model based on the Muller matrix that includes depolarization of light propagating through liquid crystal molecules, polarizers, and color filters. In this proposed model, the chromaticity can be estimated in the bump and no-bump regions of an LCD. We indicate that the difference between simulation and measurement of chromaticity is about 0.01. Light leakage in the bump region is three times that in no-bump region in the dark state.

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Wideband and wide-view circular polarizer for a transflective vertical alignment liquid crystal display

Applied Optics ◽

10.1364/ao.49.003875 ◽

2010 ◽

Vol 49 (20) ◽

pp. 3875 ◽

Cited By ~ 7

Author(s):

Je-Wook Moon ◽

Wan-Seok Kang ◽

Hag yong Han ◽

Sung Min Kim ◽

Seung Hee Lee ◽

...

Keyword(s):

Liquid Crystal ◽

Liquid Crystal Display ◽

Vertical Alignment ◽

Circular Polarizer

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Mesomorphic, dielectric, and optical properties of fluorosubstituted biphenyls, terphenyls, and quaterphenyls

Opto-Electronics Review ◽

10.2478/s11772-008-0030-3 ◽

2008 ◽

Vol 16 (4) ◽

Cited By ~ 28

Author(s):

P. Kula ◽

A. Spadło ◽

J. Dziaduszek ◽

M. Filipowicz ◽

R. Dąbrowski ◽

...

Keyword(s):

Optical Properties ◽

Liquid Crystal ◽

Dielectric Anisotropy ◽

Polar Group ◽

The Novel ◽

Vertical Alignment ◽

Rigid Core ◽

High Birefringence ◽

Low Viscosity ◽

Dielectric And Optical Properties

AbstractCompounds with moderate and large negative dielectric anisotropy (Δɛ) are very attractive liquid crystal (LC) for vertical alignment mode (VA). Materials with such properties can be achieved by lateral substitution of a polar group into a mesogenic molecule. We synthesized some new LC materials with a negative value of Δɛ, a moderately high birefringence (Δn), and a low viscosity. The mesomorphic and physical behaviour of the novel biphenyls, terphenyls and quaterphenyls fluorosubstituted in the rigid core and also with fluorinated alkyl and alkoxy chains are investigated. The prepared series of four LC compounds are promising for new LC mixtures for various applications. Examples of nematic mixtures with Δɛ∼−3.25 will be presented.

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P‐159: The Transmittance Improved of Polymer Stabilized Vertical Alignment Liquid Crystal Displays by Chiral Doping

SID Symposium Digest of Technical Papers ◽

10.1002/sdtp.14302 ◽

2020 ◽

Vol 51 (1) ◽

pp. 1986-1989

Author(s):

Xingwu Chen ◽

Mei Chen ◽

Qi Song ◽

Yinfeng Zhang ◽

Te-Jen Tseng ◽

...

Keyword(s):

Liquid Crystal ◽

Liquid Crystal Displays ◽

Vertical Alignment ◽

Polymer Stabilized

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Gram-scale preparation of negative-type liquid crystals with a CF2CF2-carbocycle unit via an improved short-step synthetic protocol

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.14.10 ◽

2018 ◽

Vol 14 ◽

pp. 148-154 ◽

Cited By ~ 2

Author(s):

Tatsuya Kumon ◽

Shohei Hashishita ◽

Takumi Kida ◽

Shigeyuki Yamada ◽

Takashi Ishihara ◽

...

Keyword(s):

Dielectric Constant ◽

Liquid Crystal ◽

Liquid Crystals ◽

Vertical Alignment ◽

Display Devices ◽

Negative Type ◽

Scale Preparation

Herein, we demonstrate an improved short-step protocol for the synthesis of multicyclic molecules having a CF2CF2-containing cyclohexadiene or cyclohexane framework in a mesogenic structure. These molecules are promising candidates for vertical alignment (VA)-mode liquid crystal (LC) display devices owing to their large negative dielectric constant. The tetrafluorinated multicyclic molecules were successfully obtained in only five or six reaction steps without the need for special handling techniques, as is generally required for thermally unstable organometallic species, representing a reduction of three reaction steps. The improved short-step synthetic protocol was also amenable to the multigram preparation of these promising molecules, which may contribute significantly to the development of novel negative-type LC molecules containing CF2CF2 carbocycles.

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