Details of a Researcher - YAMAGUCHI Rumiko

<p>A reverse mode liquid crystal (LC) characteristic which shows a transparent voltage off-state and a light scattering on-state can be obtained by two light scattering mechanisms. One is using an index mismatching between LC and polymer matrix and another is using a micro-lens array with a short focal length. Here, we combine two reverse mode technologies in one LC cell. We investigate relations between the cell thickness and the lens diameter of a hole array patterned electrode and successfully obtained the stronger light scattering with low driving voltage. Not only an extraordinary ray but an ordinary ray can also be scattered by non-uniform electric field which is caused by using hole pattered electrodes on both side of the substrates.</p>

DOI

Thresholdless electro-optical property in quasi homogeneous and homeotropic liquid crystal cells using weak anchoring surfaces

Rumiko YAMAGUCHI

IEICE TRANS. ELECTRON ( The Institute of Electronics, Information and Communication Engineers ) E102-C ( 11 ) 810 - 812 2019.11 [Refereed]

Research paper (journal) Single author

Liquid crystal director distributions between strong and weak polar anchoring surfaces in hybrid aligned cells are numerically analyzed. When the anchoring is a critical one, homogeneously or homeotropicly liquid crystal alignment can be obtained. Such cells have no threshold voltage and a driving voltage can be reduced less than 0.5 volt. © 2019 The Institute of Electronics, Information and Communication Engineers.

DOI

Louver function in hybrid aligned reverse mode using dual frequency liquid crystal

Yamaguchi Rumiko, Ushizaki Ryo

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 32 ( 4 ) 545 - 548 2019.04 [Refereed]

Research paper (journal) Domestic Co-author

<p>We have proposed reverse mode liquid crystal (LC) cells with a hybrid alignment nematic (HAN). A dual frequency LC which has positive and negative dielectric anisotropies and a reactive mesogen were used to prepare the cell. The reverse mode HAN cell has a transparent state at any incident angle in the voltage off state. The cell scattered a normal incident light by the voltage application and the transmittance, however, becomes high at a certain oblique incident angle like a louver of a window shutter. Such an incident angle can be switched by the frequency of applied voltage since the reoriented LC director changes from perpendicular to parallel to the substrate. Moreover, the incident angle switching was theoretically analyzed using conditions of refractive index matching and mismatching between the LC and the reactive mesogen.</p>

DOI

Driving Voltage in Reverse Mode Cell Using Reactive Mesogen : Effect of UV Absorption of Liquid Crystal

Rumiko Yamaguchi, Ryosuke Sasaki, and Koichi Inoue

Journal of Photopolymer Science and Technology ( The Society of Photopolymer Science and Technology ) 31 ( 3 ) 301 - 304 2018.06 [Refereed]

Research paper (journal) Domestic Co-author

We have proposed reverse mode liquid crystal (LC) cells by using a polymer stabilized LC technology. A reactive mesogen was dissolved in the LC and was polymerized by UV light from an Hg lamp (313 nm) and a UV-LED (365 nm) light sources. LC materials with and without UV absorption at each wavelength were prepared and electro-optical properties of the reverse mode cell were measured. It was found that the electro-optical property strongly depended on the UV absorption of the LC. Next we mixed LCs with and without UV absorption to adjust the UV intensity profile in the bulk of the LC cell. We successfully reduced the driving voltage by changing the absorption coefficient of LC mixtures.

DOI

Effect of Liquid Crystal Material on Polymer Network Structure in Polymer Stabilized Liquid Crystal Cell

Rumiko Yamaguchi, Kota Inoue, Ryo Kurosawa

Journal of Photopolymer Science and Technology 29 ( 2 ) 289 - 292 2016.08 [Refereed]

Research paper (journal) Domestic Co-author

Polymer stabilized liquid crystal (PSLC) cells have been fabricated by using a reactive
mesogen (RM) and various LC materials. It is clarified that a polymer network structure
changes by selecting not only RM but also LC materials. Using the LC with a tolane
substance, a “rice grain like” morphology can be obtained, which results in low threshold and
driving voltages even if a dielectric constant anisotropy of the LC is very small. On the other
hand, a “smooth stranded network” morphology causes the high driving voltage. When two
LC materials which contribute to the smooth stranded network morphology are mixed and
the LC mixture is used to fabricate the PSLC cell, the rice grain like morphology is formed.
The driving voltage is lower than that in cells using two pure LCs. A relationship between
solubility of the RM in the LC and the morphology formation is not observed.

DOI

Driving voltage properties sensitive to microscale liquid crystal orientation pattern in twisted nematic liquid crystal cells

Michinori Honma, Koki Takahashi, Rumiko Yamaguchi, Toshiaki Nose

Japanese Journal of Applied Physics ( 55 ) 041701-1 - 041701-6 2016.03 [Refereed]

Research paper (journal) Domestic Co-author

We investigated the micropattern-sensitive driving voltage properties of twisted nematic liquid crystal (LC) cells and found that the threshold
voltage for inducing the Fréedericksz transition strongly depends on the micropatterned LC molecular orientation state. We discuss the effects
of various cell parameters such as the period of the micropattern Λ, the LC layer thickness d, and the twist angle Φ on the threshold voltage.
By a computer simulation of the LC molecular orientation, we found that the threshold voltage Vth varies in response to the deformation factor Δ
(= d2/Λ2 + Φ2/π2) of the spatially distributed LC molecular orientation. We confirm that V2
th is proportional to 1 % Δ from both theoretical and
experimental standpoints.

DOI

UV penetration depth in hybrid-aligned reverse mode liquid crystal cell

Yamaguchi R.

Digest of Technical Papers - SID International Symposium ( Digest of Technical Papers - SID International Symposium ) 46 2015.12 [Refereed]

Research paper (journal)

DOI

Normal and reverse mode light scattering properties in nematic liquid crystal cell using polymer stabilized effect

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 28 ( 3 ) 319 - 323 2015.10 [Refereed]

Research paper (journal)

DOI

Hybrid aligned nematic liquid crystal smart glass with asymmetrical daylight controls

Yamaguchi R.

Journal of the Society for Information Display ( Journal of the Society for Information Display ) 23 ( 8 ) 365 - 370 2015.08 [Refereed]

Research paper (journal)

DOI

Azimuth easy axis and anchoring control of rubbed polymers by liquid crystal mixture

Yamaguchi R.

21st International Display Workshops 2014, IDW 2014 ( Proceedings of the International Display Workshops ) 1 62 - 65 2014.12 [Refereed] [Invited]

Research paper (journal)

Cell thickness dependence on electric optical property of reverse mode liquid crystal display

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 27 ( 3 ) 287 - 290 2014.09 [Refereed]

Research paper (journal)

DOI

Normal- and reverse-mode light-scattering properties polymer-stabilized nematic liquid crystals

Yamaguchi R.

Digest of Technical Papers - SID International Symposium ( Digest of Technical Papers - SID International Symposium ) 44 72 - 74 2013.09 [Refereed]

Research paper (journal)

DOI

Azimuthal anchoring change by liquid crystal mixtures on poly(vinyl cinnamate) film

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 26 ( 3 ) 393 - 396 2013.08 [Refereed]

Research paper (journal)

DOI

Cholesteric liquid crystal-carbon nanotube composites with photo-settable reversible and memory electro-optic modes

Yaroshchuk O.

Applied Optics ( Applied Optics ) 52 ( 22 ) 2013.08 [Refereed]

Research paper (journal)

DOI

Effect of morphology on the electro-optical property in reverse mode liquid crystal display

Yamaguchi R.

IEICE Transactions on Electronics ( IEICE Transactions on Electronics ) E95-C ( 11 ) 1752 - 1755 2012.11 [Refereed]

Research paper (journal)

DOI

Electro-optical properties and morphology of reverse scattering mode TN LCD

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 25 ( 3 ) 313 - 316 2012.10 [Refereed]

Research paper (journal)

DOI

Photoinduced helical inversion in cholesteric liquid crystal cells with homeotropic anchoring

Gvozdovskyy I.

Optics Express ( Optics Express ) 20 ( 4 ) 3499 - 3508 2012.02 [Refereed]

Research paper (journal)

DOI

Dielectric properties of nematic liquid crystal modified with diamond nanoparticles

Tomylko S.

Ukrainian Journal of Physics ( Ukrainian Journal of Physics ) 57 ( 2 ) 239 - 243 2012.02 [Refereed]

Research paper (journal)

Dielectric and electro-optical properties of liquid crystals doped with diamond nanoparticles

Tomylko S.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 541 35/[273] - 43/[281] 2011.06 [Refereed]

Research paper (journal)

DOI

Reverse-mode liquid crystal gels with twisted orientation

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 49 ( 6 PART 1 ) 0602031 - 0602033 2010.06 [Refereed]

Research paper (journal)

DOI

Liquid-crystal blazed gratings with spatially distributed pretilt angle

Honma M.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 49 ( 6 PART 1 ) 0617011 - 0617014 2010.06 [Refereed]

Research paper (journal)

DOI

Liquid crystal material dependence on rubbed PVCi alignment properties

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 516 32 - 37 2010.01 [Refereed]

Research paper (journal)

DOI

Photostability evaluation of liquid crystal cell under a focused blue-violet laser beam

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 22 ( 4 ) 533 - 536 2009.12 [Refereed]

Research paper (journal)

DOI

Dynamics of surface memory effect in liquid crystal alignment on reconfigurable microwrinkles

Ohzono T.

Applied Physics Letters ( Applied Physics Letters ) 95 ( 1 ) 2009.07 [Refereed]

Research paper (journal)

DOI

Liquid-crystal variable-focus lenses with a spatially-distributed tilt angles

Honma M.

Optics Express ( Optics Express ) 17 ( 13 ) 10998 - 11006 2009.06 [Refereed]

Research paper (journal)

DOI

Photo degradation properties of liquid crystal cell using focused blue-violet laser beam

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 507 51 - 55 2009.01 [Refereed]

Research paper (journal)

DOI

Improvement of white fluorescent liquid crystal display

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 488 210 - 218 2008.09 [Refereed]

Research paper (journal)

DOI

Double-faced optical writing in guest-host mode liquid crystal cell using crosslinkable polymer alignment film

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 21 ( 2 ) 203 - 206 2008.08 [Refereed]

Research paper (journal)

DOI

Transient properties during positive-negative switching of liquid crystal lens

Ye M.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 480 ( 1 ) 44 - 48 2008.02 [Refereed]

Research paper (journal)

DOI

Liquid crystal microlens driven by two voltages

Ye M.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 480 ( 1 ) 31 - 35 2008.02 [Refereed]

Research paper (journal)

DOI

Numerical and experimental studies of liquid crystal lens with stacked structure of two liquid crystal layers

Wang B.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 480 ( 1 ) 36 - 43 2008.02 [Refereed]

Research paper (journal)

DOI

Liquid crystal alignment on rubbed polyvinyl-cinnamate with overdose of UV light

Yamaguchi R., Kimura J, Sato S.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 20 ( 1 ) 23 - 27 2007.09 [Refereed]

Research paper (journal) Domestic Co-author

DOI

Highly dichroic benzo-2,1,3-thiadiazole dyes containing five linearly π-conjugated aromatic residues, with fluorescent emission ranging from green to red, in a liquid crystal guest-host system

Zhang X.

Journal of Materials Chemistry ( Journal of Materials Chemistry ) 16 ( 8 ) 736 - 740 2006.02 [Refereed]

Research paper (journal)

DOI

Sensitization effects of fluorescent dichroic dyes in a nematic liquid crystal and fluorescence colors

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 433 87 - 95 2005.12 [Refereed]

Research paper (journal)

DOI

Liquid crystal optical security device with polarized latent images

Yamaguchi R.

IDW/AD'05 - Proceedings of the 12th International Display Workshops in Conjunction with Asia Display 2005 ( Proceedings of the International Display Workshops ) ( 1 ) 65 - 68 2005.12 [Refereed] [Invited]

Research paper (journal)

Control of liquid crystal alignment on crosslinkable polymer surfaces with photo and plasma modification

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 18 ( 1 ) 23 - 26 2005.07 [Refereed]

Research paper (journal)

DOI

Control of Liquid Crystal Alignment on Crosslinkable Polymer Surfaces with Photo and Plasma Modification

Yamaguchi R.

Journal of Photopolymer Science and Technology 18 ( 1 ) 23 - 26 2005.01 [Refereed]

Research paper (journal)

Continuous grey scale image printing on the liquid crystal cell

Yamaguchi R.

Applied Physics Letters ( Applied Physics Letters ) 86 ( 3 ) 1 - 3 2005.01 [Refereed]

Research paper (journal)

DOI

Latent image forming by exposure, development and fixing on liquid crystal cells

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 438 101/[1665] - 107/[1671] 2005.01 [Refereed]

Research paper (journal)

DOI

Liquid crystal alignment properties on crosslinkable polymer films with plasma surface modification

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 438 109/[1673] - 116/[1680] 2005.01 [Refereed]

Research paper (journal)

DOI

Sensitizing effects of fluorescent dichroic dyes in nematic liquid crystal

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 422 2004.12 [Refereed]

Research paper (journal)

DOI

Sensitized fluorescence of dichroic dye in emissive type liquid crystal displays

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 410 2004.12 [Refereed]

Research paper (journal)

DOI

Patterning properties of liquid crystal alignment by anchoring control

Yamaguchi R.

Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals ) 412 2004.12 [Refereed]

Research paper (journal)

DOI

Liquid crystal alignment surface with two easy axes induced by unidirectional rubbing

Yamaguchi R.

Applied Physics Letters ( Applied Physics Letters ) 82 ( 25 ) 4450 - 4452 2003.06 [Refereed]

Research paper (journal)

DOI

Liquid-crystal optical rotator using weak azimuthal anchoring surface

Yamaguchi R.

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers ( Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers ) 40 ( 11 ) 6522 - 6525 2002.11 [Refereed]

Research paper (journal)

DOI

A novel patterning method of liquid crystal alignment by azimuthal anchoring control

Yamaguchi R.

Japanese Journal of Applied Physics, Part 2: Letters ( Japanese Journal of Applied Physics, Part 2: Letters ) 41 ( 8 A ) 2002.08 [Refereed]

Research paper (journal)

DOI

Novel method for pretilt angle measurement using liquid crystal lens cell with hybrid alignment

Wang B.

Research paper (journal)

DOI

Tortional torque effects of twisted nematic bulk on the polymer surface alignment

Yamaguchi R.

Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals ) 367 379 - 386 2001.01 [Refereed]

Research paper (journal)

DOI

Multicolor switching properties in fluorescent liquid crystal displays

Yamaguchi R.

Research paper (journal)

DOI

Increase of azimuthal anchoring energy and thermal stability at homogeneously orientated liquid crystal/polymer interface

Yamaguchi R.

Japanese Journal of Applied Physics, Part 2: Letters ( Japanese Journal of Applied Physics, Part 2: Letters ) 39 ( 7 A ) 2000.07 [Refereed]

Research paper (journal)

DOI

Application of a circularly homogeneously aligned liquid-crystal cell to real-time measurements of twist angles in twisted-nematic liquid-crystal cells

Honma M.

Research paper (journal)

Fluorescent liquid crystal color display using a guest-host UV shutter and phosphor layers on the inside of the cell

Yamaguchi R.

Japanese Journal of Applied Physics, Part 2: Letters ( Japanese Journal of Applied Physics, Part 2: Letters ) 38 ( 6 A/B ) 1999.06 [Refereed]

Research paper (journal)

DOI

Multicolor Fluorescent Liquid Crystal Display using a UV Light Emitting Diode

Yamaguchi R.

Research paper (journal)

DOI

Patterned alignment of liquid crystal on photopolymer by single-exposure photocuring process

Rajesh K.

Research paper (journal)

DOI

Novel alignment process in liquid crystal cell fabrication using reversible poly(vinyl-cinnamate) photoalignment technique

Yamaguchi R.

Japanese Journal of Applied Physics, Part 2: Letters ( Japanese Journal of Applied Physics, Part 2: Letters ) 37 ( 3 B ) 1998.03 [Refereed]

Research paper (journal)

DOI

Peculiar alignment properties of nematic liquid crystals with a bicyclohexane core

Yamaguchi R.

Research paper (journal)

DOI

Alignment of liquid crystal on poly (vinyl cinnamate) photopolymer and anchoring direction

Rajesh K.

Research paper (journal)

DOI

Wide viewing angle properties in nematic liquid crystal / UV curable liquid crystal composite films with some aligned-modes

Yamaguchi R.

Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 10 ( 1 ) 19 - 24 1997.06 [Refereed]

Research paper (journal)

DOI

Reverse mode and wide viewing angle properties in polymer dispersed liquid crystal cells prepared using a UV curable liquid crystal

Yamaguchi R.,Waki Y.,Sato S.

Research paper (journal) Domestic Co-author

DOI

Cross-sectional observations of laser addressed UV curable smectic liquid crystal cells

Yamaguchi R.

Research paper (journal)

DOI

Anisotropy of nonrubbed UV curable polymer films inducing liquid crystal alignment

Yamaguchi R.

Japanese Journal of Applied Physics, Part 2: Letters ( Japanese Journal of Applied Physics, Part 2: Letters ) 35 ( 7 SUPPL. B ) 1996.07 [Refereed]

Research paper (journal)

DOI

Determination of nematic liquid crystal (NLC) orientation by observing NLC droplets on alignment surfaces

Yamaguchi R.

Japanese Journal of Applied Physics, Part 2: Letters ( Japanese Journal of Applied Physics, Part 2: Letters ) 35 ( 1 B ) 1996.01 [Refereed]

Research paper (journal)

DOI

A radial molecular orientation using a flow-induced aligning method in a nematic liquid crystal cell

Masuda S.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 34 ( 8 R ) 4129 - 4132 1995.08 [Refereed]

Research paper (journal)

DOI

Alignment of liquid crystals by copying an aligning function of polymer films into a UV cured polymer surface

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 34 ( 7 ) L897 - L899 1995.07 [Refereed]

Research paper (journal)

DOI

Effects of Uv Irradiation in Memory-Type Pdlc Films Formed by a Photo-Induced Phase Separation

Yamaguchi R.

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals ( Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals ) 262 ( 1 ) 119 - 127 1995.03 [Refereed]

Research paper (journal)

DOI

Light scattering and reflection properties in polymer dispersed liquid crystal cells with memory effects

Yamaguchi R.

IEICE Transactions on Electronics ( IEICE Transactions on Electronics ) E78-C ( 1 ) 106 - 110 1995.01 [Refereed]

Research paper (journal)

Relationship between Film Thickness and Electro-Optical Properties in Polymer Dispersed Liquid Crystal Films

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 33 ( 7R ) 1994.07 [Refereed]

Research paper (journal)

DOI

Thermally addressed and erasable displays by polymer‐dispersed nematic liquid crystals with memory properties

Yamaguchi R.

Journal of the Society for Information Display ( Journal of the Society for Information Display ) 1 ( 3 ) 347 - 352 1993.10 [Refereed]

Research paper (journal)

DOI

Angular dependence of transmission properties in polymer-dispersed liquid-crystal cells with memory effects

Sato S.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 32 ( 5 R ) 2025 - 2028 1993.05 [Refereed]

Research paper (journal)

DOI

Highly transparent memory states in polymer dispersed liquid crystal films

Yamaguchi R.

Liquid Crystals ( Liquid Crystals ) 14 ( 4 ) 929 - 935 1993.01 [Refereed]

Research paper (journal)

DOI

Thermally Addressed polymer dispersed liquid crystal displays

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 31 ( 8 ) L1093 - L1095 1992.08 [Refereed]

Research paper (journal)

DOI

Highly transparent memory states by phase transition with a field in polymer dispersed liquid crystal films

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 31 ( 3 ) L254 - L256 1992.03 [Refereed]

Research paper (journal)

DOI

Memory effects of light transmission properties in polymer-dispersed-liquid-crystal (pdlc) films

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 30 ( 4 ) L616 - L618 1991.04 [Refereed]

Research paper (journal)

DOI

Liquid crystal polarizers with axially symmetrical properties

Yamaguchi R.

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 28 ( 9 R ) 1730 - 1731 1989.09 [Refereed]

Research paper (journal)

DOI

Dispersion properties of refractive indices of nematic liquid crystals

Yamaguchi R.

Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi) ( Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi) ) 72 ( 6 ) 108 - 116 1989.06 [Refereed]

Research paper (journal)

Relationship between lens properties and director orientation in a liquid crystal lens

Sato S.

Liquid Crystals ( Liquid Crystals ) 5 ( 5 ) 1435 - 1442 1989.01 [Refereed]

Research paper (journal)

DOI

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<YAMAGUCHI Rumiko>

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