A high contrast and high transmittance multiplexing ssflc display utilizing naphthalene base liquid crystal materials

Mochizuki, Ayako; Motoyoshi, Katsusada; Nakatsuka, Masakatsu

doi:10.1080/00150199108226027

Cited by 32 publications

(7 citation statements)

References 5 publications

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“…Furthermore, it is often difficult to fabricate a defect-free FLC cell owing to the occurrence of the so-called zigzag defect, which is the boundary defect between two types of chevron domain. 12,[16][17][18][19][20][21][22][23][24][25][26][27][28] The large optical leakage and low contrast ratio due to the nonuniformity and defect of FLC molecular alignment are examples of the main problems of the application of FLCs to the display devices. In this study, therefore, we focus on vertical alignment FLCs (VA-FLCs) [29][30][31][32][33] fabricated without the rubbing technique.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of vertical alignment in ferroelectric liquid crystals for display application

Furue

Horiguchi

Yamamichi

et al. 2014

Jpn. J. Appl. Phys.

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In this study, we focus on vertical alignment ferroelectric liquid crystals (VA-FLCs), because an FLC display with a high contrast ratio is expected. In the VA, although the normal of smectic layers is vertical to the substrate surface, the director of FLC molecules must tilt to the substrate surface at the tilt angle of FLC molecules. Thus, it is usually difficult to obtain a uniform VA in FLCs. We determine the optimum conditions for the fabrication of VA-FLC cells in terms of the tilt angle of FLC molecules, the anchoring strength of the alignment film, and the cell gap. Results indicate that the FLC with a small tilt angle tends to form good VA, which can be obtained by utilizing alignment films with high surface anchoring strengths. Good VA strongly depends on the cell gap.

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Section: Introductionmentioning

confidence: 99%

Fabrication of vertical alignment in ferroelectric liquid crystals for display application

Furue

Horiguchi

Yamamichi

et al. 2014

Jpn. J. Appl. Phys.

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“…However, they have a serious problem of the appearance of zig-zag defects that degrade the contrast ratio of the displays due to the formation of the so-called chevron layer structure [5,6]. This difficulty can be eliminated using several techniques, such as the use of a special FLC material having a naphthalene ring core [7], the application of a low frequency electric field as a treatment [8,9], and the formation of high surface pretilt together with the crossrubbing alignment treatment [lo]. However, these methods are not always universally useful nor available, and so there is still a need to eliminate zig-zag defects and improve the EO performance of SSFLCDs.…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystalline Polymer Stabilized FLCDs with Conventional Rubbed Polyimide Films or with Photo Alignment Films of Poly(vinyl Cinnamate)

Kataoka

Taguchi

Iimura

et al. 1997

Molecular Crystals and Liquid Crystals Science and Technology.

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Polymer stabilized SSFLCDs have been successfully fabricated. A liquid crystalline polymer network in a device cell is formed by the photo-cure of UV photo-currable liquid crystalline monomers that are doped in an FLC, where both the rubbed polyimide (PI) and non-rubbed but linearly polarized UV irradiated poly(viny1 cinnamate) (PVCi) films are utilized as surface FLC molecular alignment. The actual monomers adopted is acrylate with a mesogenic side chain. The PVCi is one of the photo alignment polymer. The fabrication process of these SSFLC cells is as follows; first the photo-cure is done on a monomers and initiators doped LC medium at the temperature where this material takes SmA phase and then the cell is cooled down to room temperature, at which the medium takes SmC* phase. The layer structure of the liquid crystalline polymer stabilized (LC-PS) FLC cells has been investigated by X-ray diffraction measurement. As the experimental results, it is found that the formed polymer network suppresses the formation of a chevron layer structure, resulting in the formation of a quasibookshelf layer structure; the only C1-uniform state is spontaneously formed without giving a high surface pretilt angle; and a fairly good memory state with an excellent contrast ratio and a low threshold voltage are obtained for a low concentration of doped monomers (2 -3 wt?h) in particular with photo-alignment layers of PVCi; and furthermore, in a cell with a higher concentration of doped monomers (4 wt%) an excellent electroclinic like behavior (called the quasi-electroclinic effect) is obtained.

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“…In the last decade, a significant number of research papers on naphthalene LC cores appeared in the literature. [12][13][14][15][16][17][18][19][20][21] Recently the synthesis and mesomorphic properties of banana-shaped compounds derived from 2,7-dihydroxynaphathalene have also appeared in the literature. 22,23 Previously we have reported 24,25 the mesogenic homologous series of Schiff's base esters containing the naphthalene moiety and studied the effect of lateral thiol and methoxy substituent on mesomorphism.…”

Section: Introductionmentioning

confidence: 99%

Naphthyl azomesogens with lateral chloro groups

2004

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A homologous series of azomesogens, 2″-[4-(4′-n-alkoxybenzoyloxy)-2-chlorophenylazo] naphthalenes, with lateral chloro groups was synthesised. All the homologues synthesized exhibit enantiotropic nematic mesophase. The mesomorphic properties of the present series are compared with other structurally related series to evaluate the effect of lateral chloro group and its position on mesomorphism.

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A high contrast and high transmittance multiplexing ssflc display utilizing naphthalene base liquid crystal materials

Abstract: Both bookshelf and quasi-bookshelf layer structures are obtained by using naphthalene base liquid crystal mixture with a rubbed polymer orientation films panel. This panel shows a high contrast ratio reaching at 351 and high transmittance of 40% driven by multiplexing method.

Cited by 32 publications

References 5 publications

Fabrication of vertical alignment in ferroelectric liquid crystals for display application

Fabrication of vertical alignment in ferroelectric liquid crystals for display application

Liquid Crystalline Polymer Stabilized FLCDs with Conventional Rubbed Polyimide Films or with Photo Alignment Films of Poly(vinyl Cinnamate)

Naphthyl azomesogens with lateral chloro groups

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