• Title/Summary/Keyword: Liquid Crystal Mixture

Search Result 94, Processing Time 0.029 seconds

Liquid Crystal Materials and Technologies inside Modern Displays

  • Naemura, Shohei
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2003.07a
    • /
    • pp.277-282
    • /
    • 2003
  • Computational calculations are now successfully introduced to design liquid crystal molecules for uses in modern active-matrix displays. These material technologies are practically applied to develop novel compounds, enabling formulation of advanced liquid crystal mixtures together with a newly developed mixture purification method. Typical examples of these liquid crystal mixtures are introduced for modern displays in various applications.

  • PDF

Recent Progress in Advanced LC Mixture Development for TFT LCD

  • Lee, Seung-Eun;Song, Dong-Mee;Kim, Eun-Young;Jacob, Thomas;Czanta, Markus;Manabe, Atsutake;Tarumi, Kazuaki;Wittek, Michael;Hirschmann, Harald;Rieger, Bernhard
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2006.08a
    • /
    • pp.159-162
    • /
    • 2006
  • We reviewed our recent advances in LC mixture development identifying the new classes of materials to yield LC mixtures with faster switching times and better reliability

  • PDF

Advanced LC Mixture Concept of Improved Response Time

  • Czanta, Markus;Tarumi, Kazuaki;Lee, Seung-Eun;Lee, Sang-Kyu;Jin, Min-Ok
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2007.08a
    • /
    • pp.200-202
    • /
    • 2007
  • Improvement of LC mixtures can be realized by the development of new molecules in combination with the identification of advanced mixture concepts. By new high-polar single materials rotational viscosity has recently been improved significantly. Now, a new LC mixture concept for IPS and FFS technology has been identified which additionally improves switching time by up to 10%. This advanced concept is based on a more efficient usage of high-polar materials and Super Low Viscous (SLV) compounds and simultaneous reduction of less efficient materials.

  • PDF

Molecular Orientation and Optical Properties of Liquid Crystal Mixture Films of Photo-Reactive Mesogens and Non-Reactive Nematic Liquid Crystals (광경화성 액정과 비반응성 네마틱 액정 혼합 필름의 분자 배향 및 광학 특성)

  • Lee, Mong-Ryong;Shin, Mi-Young;Kim, Sung-Hyun;Song, Ki-Gook
    • Polymer(Korea)
    • /
    • v.35 no.5
    • /
    • pp.493-498
    • /
    • 2011
  • Reactive mesogens were used to prepare photo-cured liquid crystal films in which orientations of liquid crystal molecules were preserved by crosslinked networks of cured reactive mesogens. The molecular orientations of liquid crystal mixtures of photo-reative mesogens and non-reactive nematic liquid crystals were studied and compared before and after curing reactions. The effects of temperature and the amount of the non-reactive nematic liquid crystal in the mixture on birefringence of the liquid crystal films were investigated. It was found that optical compensation films with different birefringence could be prepared by controlling the amount of the nematic liquid crystals in the reactive mesogen mixtures.

Control of liquid crystal pretilt angle using polyimide mixture

  • Kang, Dae-Seung;Lee, Ji-Hoon;Rosenblatt, Charles
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2008.10a
    • /
    • pp.1577-1579
    • /
    • 2008
  • A mixture of two different types of polyimide, one having an alkyl side chain and ordinarily used for homeotropic alignment, and the other without a side chain and ordinarily used for planar alignment, is deposited and baked at high temperatures. When the resulting cell is filled with a nematic liquid crystal, it is found that the pretilt angle is a function of the baking temperature or mixing ratio, and can be controlled continuously over the range 0 to 90.

  • PDF

A Study on Curing Behaviors and Structures of Chiral Liquid Crystal-Polymer composite films (키랄네마틱액정-고분자 복합막의 경화거동과 내부구조에 관한 연구)

  • 남수용;김종원;김용욱
    • Journal of the Korean Graphic Arts Communication Society
    • /
    • v.16 no.3
    • /
    • pp.15-27
    • /
    • 1998
  • Several aspects of polymer dispersed liquid crystal(PDLC) film properties make them interesting for display application. Most versions of PDLC materials are able to modulate light without the use of polarizers, which offers advantages in optical throughput(brightness) and viewing angle compared to polarizer-based display. In this papers, we attemped to doe minimum of remaining liquid crystals at polymer network for the liquid crystal-polymer composite (LCPC) films. In results, best phase separation behaviors turned out liquid crystal/monomer/oligomer mixture system.

  • PDF

Case study of SAMSUNG TFT-LCD Technology Innovation using TRIZ method (트리즈 기법을 활용한 삼성전자의 TFT-LCD 기술혁신 사례연구)

  • Ban, Byeong-Seob
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.15 no.6
    • /
    • pp.3429-3434
    • /
    • 2014
  • In the TFT-LCD(Thin Film Transistor-Liquid Crystal Display) panel manufacturing industry, SAMSUNG, a late entry, can catch up to leading first mover, SHARP. The changes the note, monitor, TV, and mobile markets in the TFT-LCD industry were studied using a system analysis method. In addition, the fast response time technology in SAMSUNG TFT-LCD technology was developed using the TRIZ method. For example, a new liquid crystal mixture of a wide view angle and fast response time were developed by doping a new high birefringence liquid crystal material in a base mixture using the contradiction method and su-field method of TRIZ. The response time of a new liquid crystal mixture was improved to approximately 60%(16.2ms with base LC mixture, 9.8ms with a new LC mixture).

High Speed Response Time of Nematic Liquid Crystal Mixtures for LCD Monitor and TV Applications

  • Kim, Y.B.;Hur, I.K.
    • Journal of Information Display
    • /
    • v.2 no.3
    • /
    • pp.32-38
    • /
    • 2001
  • The most important parameter for TV application of LCD is a fast switching time for the display of moving image. To achieve faster switching time, the novel LC single materials with large dielectric anisotropies ($16{\sim}20$), high clearing temperatures ($195.5{\sim}237.4^{\circ}C$), broad nematic ranges (up to 169.9 $^{\circ}C$) and high birefringence ($0.254{\sim}0.2200$) were developed. KUR-series LC mixtures blended these single materials having significantly higher clearing temperatures and dielectric anisotropy values compared with conventional LC mixture. Especially, their clearing temperatures are $10{\sim}30^{\circ}C$ higher than their host mixture. These LC mixtures showing about lOms of high-speed switching time in Tv/Monitor of TFT LCD, is short enough to be addressed in a single time frame of 60Hz (16.7 ms). The threshold voltage $V_{th}$ was low enough to operate at a driving voltage of 5 V. The VHR values were found to be high enough for TFT-LCD in wide temperature range. Our novel LC mixtures are suitable materials for the inclusion in to LC mixtures for TV application of TN-LCD

  • PDF

Various Pattern-Forming States of Nematic Liquid Crystal Based on the Sign Inversion of Dielectric Anisotropy

  • Kang, Shin-Woong;Chien, Liang-Chy
    • Macromolecular Research
    • /
    • v.15 no.5
    • /
    • pp.396-402
    • /
    • 2007
  • The dielectric properties and various pattern-forming states of dual-frequency material in a nematic phase, as well as its mixture containing low concentrations of reactive monomers, are reported. The dielectric relaxation behaviors of nematic MLC 2048 are presented and compared to its mixture containing both mesogenic and nonmesogenic reactive monomers. The sign-inversion frequency of the dielectric anisotropy was significantly shifted on the addition of small amounts of the reactive monomers. However, all three mixtures used in this study essentially exhibited the same field-induced instabilities at different frequencies and voltage domains of the applied electric field. A broad band of modulated states were found to exist above a critical voltage and within a voltage dependent frequency band in the vicinity of the sign-inversion frequency, $f_I$, of the dielectric anisotropy. As the $f_I$ of the mixtures shifted, so did the bands of the modulated state of the different mixtures and the temperatures, which were well matched with the measured $f_I$ value.

A Molecular Dynamics Computer Simulation Method for the Calculation of Rotational Viscosity of Liquid Crystal Mixture

  • Kim, Jin-Soo;Ahmad, Farzana;Muhammad, Jamil;Park, Sang-Woo;Lee, Jin-Woo;Yun, Hee-Young;Jung, Jae-Eun;Jang, Jae-Eun;Jeon, Young-Jae;Kim, Yong-Bae
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2009.10a
    • /
    • pp.607-609
    • /
    • 2009
  • We present a Brownian molecular dynamics computer simulation method for calculating the rotational viscosity of the liquid crystal mixture comprising pentylcyanobiphenol (5CB) and decylcyanobiphenol (10CB). Mean director of the ensemble has been used as a nematic director. Results show a good agreement with experimental ones [Sudeshna DasGupta et al., Physics Letters A 306(2003)235-242].

  • PDF