Physical Property of New Liquid Crystal Materials and Mixture Design for Active Matrix LCD

Iwashita, Yumi; Kaneoya, Masakazu; Takeuchi, Kiyofumi; Takehara, Sadao; Takatsu, Haruyoshi

doi:10.1080/10587250108025057

Cited by 11 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Low and medium birefringence nematic LCs (Δn = 0.09/0.12) are still most important for display applications [1][2][3][4][5][6][7]. They are used in large TV screens and computer monitors, and also in smaller flat panels of mobile phones, automotive devices and projectors.…”

Section: Applications Of High Birefringence Liquid Crystals (Lcs)mentioning

confidence: 99%

“…With the lower melting temperatures T m of the mixture components together with the low values of melting enthalpies, a lower melting point for the eutectic mixture is observed. The composition of k-component eutectic mixture and its melting temperature may be calculated from the Equations (1) and (2), if the data of the pure components is known:…”

Section: Requirement For Liquid Crystal Moleculesmentioning

confidence: 99%

“…(1) (2) -the mole ratio of k-component; ΔH m k melting enthalpy; and T m k melting temperature of the pure k-component respectively; R gas constant. The Equation (1) has a more complex form [61] if a transition in the solid phase is observed.…”

Section: Requirement For Liquid Crystal Moleculesmentioning

confidence: 99%

See 2 more Smart Citations

High Birefringence Liquid Crystals

2013

View full text Add to dashboard Cite

Liquid crystals, compounds and mixtures with positive dielectric anisotropies are reviewed. The mesogenic properties and physical chemical properties (viscosity, birefringence, refractive indices, dielectric anisotropy and elastic constants) of compounds being cyano, fluoro, isothiocyanato derivatives of biphenyl, terphenyl, quaterphenyl, tolane, phenyl tolane, phenyl ethynyl tolane, and biphenyl tolane are compared. The question of how to obtain liquid crystal with a broad range of nematic phases is discussed in detail. Influence of lateral substituent of different kinds of mesogenic and physicochemical properties is presented (demonstrated). Examples of mixtures with birefringence ∆n in the range of 0.2-0.5 are given.

show abstract

Section: Applications Of High Birefringence Liquid Crystals (Lcs)mentioning

confidence: 99%

Section: Requirement For Liquid Crystal Moleculesmentioning

confidence: 99%

See 1 more Smart Citation

High Birefringence Liquid Crystals

2013

View full text Add to dashboard Cite

show abstract

“…We developed some kind of fused ring components and evaluated the properties of these LC components and LC mixtures with fused ring components [4][5][6][7]. In this paper, we have developed new series of LC components such as tetrahydronaphthalenes of fused ring systems which are quite new especially as LC components for AM-LCD.…”

Section: Introductionmentioning

confidence: 98%

Liquid Crystal Mixtures with Low Birefringence for Active-Matrix LCD

Iwashita¹,

Umezu²,

Kawakami³

et al. 2004

Molecular Crystals and Liquid Crystals

Self Cite

View full text Add to dashboard Cite

The liquid crystal (LC) mixtures with fused ring systems such as Decahydronaphthalenes and Tetrahydronaphthalenes for reflective or transflective active-matrix liquid crystal display (AM-LCD) have higher durability than LC mixtures with ester-components. These LC mixtures also have some problems such as low nematic-isotropic transition temperature T NI and high driving voltage. The improvement for driving voltage was carried out by using Tetrahydronaphthalene-component with moderate birefringence Dn and large dielectric anisotropy De. However, It was difficult to obtain LC mixtures with sufficiently low driving voltage, because of low T NI and the comparatively high Dn of tetrahydronaphthalene.We have improved these problems by introducing some newly developed LC components and optimization. We obtained the LC mixtures with low Dn and low driving voltage; less than 0.075 of Dn and about 4 V or less of driving voltage. These LC mixtures have high durability with stable nematic phase at low temperature.

show abstract

“…Liquid crystal’s (LC) optical properties are electrically tunable, and therefore they are attractive for displays [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ], spatial light modulators [ 9 , 10 , 11 ], laser beam steering [ 11 , 12 , 13 ], lenses [ 14 , 15 , 16 ], filters [ 17 , 18 ], etc. A crucial parameter of LC materials is their dynamics.…”

Section: Introductionmentioning

confidence: 99%

Electro-Optical and Photo Stabilization Study of Nematic Ternary Mixture

et al. 2021

View full text Add to dashboard Cite

Liquid crystal materials composed of mixed nematic compounds find broad use in liquid crystal displays and photonic applications. A ternary mixture formed from three different nematic compounds shows peculiar behavior such as tunable electro-optical properties dependent on the frequency of the driving voltage. The paper presents an analysis of the response time and phase retardation of a frequency tunable nematic liquid crystal mixture (under code name 5005). This material possesses high birefringence (Δn = 0.32 at 633 nm) as well as high dielectric anisotropy (Δε = 6.3 at 100 Hz). The unique property of the 5005 mixture is frequency-controlled phase modulation, as in a dual frequency liquid crystal, while dielectric anisotropy goes to zero instead of being negative at high frequencies. For each component of the mixture, details on mesomorphic properties and their role in the formulation of the mixture are reported. The 5005 mixture was characterized by multiple investigation techniques, such as temperature dependence dielectric anisotropy, transmittance measurements image polarizing microscopy, and UV stability.

show abstract

Physical Property of New Liquid Crystal Materials and Mixture Design for Active Matrix LCD

Cited by 11 publications

References 2 publications

High Birefringence Liquid Crystals

High Birefringence Liquid Crystals

Liquid Crystal Mixtures with Low Birefringence for Active-Matrix LCD

Electro-Optical and Photo Stabilization Study of Nematic Ternary Mixture

Contact Info

Product

Resources

About