Reduction in Driving Voltage of  In-Plane Switching Liquid Crystal Displays  Using Photo-Alignment Method

Li, Xiang Tong; Kawakami, Atsuhiro; Akiyama, Hidenari; Kobayashi, Shunsuke; Iimura, Yasufumi

doi:10.1143/jjap.37.l743

Cited by 23 publications

(11 citation statements)

References 3 publications

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“…These materials exhibit unique properties that enable them to be used for a variety of applications, including displays [1][2][3], telecommunication switching [4,5], and optical storage [6,7]. In particular, due to the increasing market for high definition displays, liquid crystal displays (LCDs) have become a prominent area of research in the LC field, as they hold the potential for enabling displays with higher resolution, lighter weight, and reduced thickness.…”

Section: Introductionmentioning

confidence: 99%

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

et al. 2003

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Electro-optic properties of polymer stabilized ferroelectric liquid crystal (PSFLC) systems are examined as a function of varying concentrations of either a linear or crosslinked thiol-ene polymer. The thiol-ene method of polymer stabilization is a drastic change from previous studies designed to avert the problem of polymer phase separation. FLC rise time and tilt angle measurements were used to determine the effects of the polymer network on the optical properties of the system. The addition of monomer impurities to both systems demonstrated a reduction in tilt angle, which translated into decreased switching speeds in both systems prior to polymerization. The crosslinked thiol-ene system showed increased switching times due to the creation of polymer in the interlayer spacing of the FLC, but exhibited minimal increase in the rotational viscosity of the system. In addition, the crosslinked polymer systems resulted in an increase in the liquid crystalline order, which produced an increase in the contrast ratio of the system. The linear polymer system showed drastically different results as compared with the crosslinked system. The rise time and tilt angle measurements decreased upon polymerization of the linear thiol-ene and the rotational viscosity and contrast ratio values also decreased. We suggest that the linear thiol-ene polymer phase separation from the interlayer spacing leads to a microscopic misalignment of the FLC molecules, causing a decrease in the optical properties of the LC.

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Section: Introductionmentioning

confidence: 99%

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

et al. 2003

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“…Note that V th is independent of cell thickness. From table 3, the experimental V th values of the NLC/B1, NLC/B2, NSLC/1 and NSLC/2 mixtures were all smaller than the theoretical V th of 2.22 V, suggesting fast driving in LC devices [96][97][98][99][100]. Moreover, figures 8(a)-(e) show that all the LC mixtures retained excellent bright-state displays after the application of V sat .…”

Section: Electrooptical Studies Of Lc Mixturesmentioning

confidence: 86%

Improvement in device performance from a mixture of a liquid crystal and photosensitive acrylic prepolymer with the photoinduced vertical alignment method

Lin

Tao

et al. 2011

Science and Technology of Advanced Materials

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In a multicomponent nematic liquid crystal (NLC) mixture of a liquid crystal (negative-type NLC) and a photosensitive acrylic prepolymer, photopolymerization upon UV irradiation induces the separation of the LC and photosensitive acrylic prepolymer layers, thereby leading to a vertical arrangement of LC molecules. In this study, we propose a simple vertical alignment method for LC molecules, by adding a chiral smectic A (SmA * ) liquid crystal having homeotropic texture characteristics to an NLC mixture solution. Measurements of electro-optical properties revealed that the addition of the SmA * LC not only strengthened the anchoring force of the copolymer alignment film surface, but also significantly enhanced the contrast ratio (∼73%), response time and grayscale switching performance of the device.

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“…Comparison of the theoretical and experimentally measured values of the LC (Table 4) revealed that the LC mixture system used in this study lowered the V th of the LC (Equation (5)). After the LC cell had undergone photo-alignment, the weaker anchoring energy or larger pre-tilt angle of the alignment film surface could effectively reduce the V th and achieve rapidly driven display effects [126,[184][185][186][187]. In addition, we surmised from Equation (5) that the K eff of the LC itself increased with the incorporation of the acrylic monomer.…”

Section: Electro-optical Properties Of the Nlc2 Systemmentioning

confidence: 98%

“…Since the anchoring energy of the alignment film surface formed after UV light irradiation was weaker [126,183,184], the time required for vertical rotation of the LC molecules was shorter. Therefore, the T r measured for each group of LC cells was around 8-9 ms.…”

Section: Electro-optical Properties Of the Nlc2 Systemmentioning

confidence: 99%

Fabrication of pseudo-pi vertical alignment mode liquid crystal devices with ultra-violet polymerisation and investigations of their electro-optical characteristics

Ho¹,

Lee²

2010

Liquid Crystals

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In this study, we applied the non-contact photo-polymerisation method in fabricating pseudo-polyimide (PI) liquid crystal (LC) devices with vertical alignment copolymer films, in the hope of solving the problems associated with traditional rubbing alignment processes. We mixed different photo-polymerisation-type acrylic monomers and negative dielectric anisotropy LC at proper weight percentages, and induced phase separation behaviour between the photo-polymerisation-type acrylic monomers and the LC molecules in the LC mixture solution through ultraviolet light irradiation, thereby forming copolymer films with vertical alignment effects. We further conducted preliminary characterisation of the alignment mechanism, photo-polymerisation, etc., of the LC molecules and investigated their interactions with alkyl acrylic monomers with different carbon chain lengths (the analogue of alkyl side chains in traditionally used vertical alignment-type PI) and electro-optical properties such as the transmittance, contrast ratio, and response time.

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Reduction in Driving Voltage of In-Plane Switching Liquid Crystal Displays Using Photo-Alignment Method

Cited by 23 publications

References 3 publications

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

Improvement in device performance from a mixture of a liquid crystal and photosensitive acrylic prepolymer with the photoinduced vertical alignment method

Fabrication of pseudo-pi vertical alignment mode liquid crystal devices with ultra-violet polymerisation and investigations of their electro-optical characteristics

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