Pretilt Angles of Liquid Crystal on Organic-Solvent-Soluble   Polyimide Alignment Films

Nishikawa, Michinori; Sano, Kimiyasu; Miyamoto, Tsuyoshi; Yokoyama, Yayoi; Bessho, Nobuo; Seo, Dae Shik; Iimura, Yasufumi; Kobayashi, Shunsuke

doi:10.1143/jjap.33.4152

Cited by 16 publications

(11 citation statements)

References 7 publications

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“…VHRs of LC cells using rubbed PI shows the lowest value probably due to the surface contamination by impurities from rubbing cloth. VHRs of LC cells using UV exposed PI in nitrogen show higher VHR than that of UV exposed PI in air, which is the same as those using conventional PI materials for active matrix use [15].…”

Section: Vhr Of Lc Cellssupporting

confidence: 61%

11.1: Polyimide Films Designed to Produce High Pretilt Angles with a Single Linearly Polarized UV Exposure

Nishikawa

Taheri

West

1998

Symp Digest of Tech Papers

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Section: Vhr Of Lc Cellssupporting

confidence: 61%

11.1: Polyimide Films Designed to Produce High Pretilt Angles with a Single Linearly Polarized UV Exposure

Nishikawa

Taheri

West

1998

Symp Digest of Tech Papers

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“…Thus far, many studies on the pretilt angle have been reported. [56][57][58][59][60][61][62][63][64][65][66][67] Pretilt angle generation in a rubbed polyimide alignment film is thought to be influenced by the inclined refractive index ellipsoid of the stretched surface layer and the conformation of polyimide molecules, 68,69 but there is no clear boundary between LC and alignment film, and LC molecules invade the surface layer of the alignment film. The pretilt angle is also influenced by the structure of the LC molecules.…”

Section: Pretilt Control By Alignment Materialsmentioning

confidence: 99%

Alignment control technology of liquid crystal molecules

Ishihara

Mizusaki

2019

J Soc Info Display

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Liquid crystal displays are now indispensable in everyday life. The display characteristics considerably depend on the configuration of liquid crystal (LC) molecules and interactions between the LC molecules and an alignment film surface. In this paper, we introduce various methods to control parameters that dominate the LC alignment. These parameters include order parameters, the pretilt angle, the director direction, and surface anchoring strength. We also introduce their evaluation methods. In particular, recent alignment film‐free technology is explained in detail. In addition, details of how these parameters are related to the display characteristics, particularly wide viewing angles and fast response characteristics, are described primarily with reference to recent technologies.

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“…31 High imidization ratios are required to obtain stable polyimides with excellent performance. 43 Imidization ratios of polyimides are generally measured by IR measurement and comparing absorption intensities of amic acid carbonyl groups with those of imide carbonyl groups. 44 In the case of soluble polyimides, NMR measurement is convenient because solution samples can be prepared that give more quantitative imidization ratio data.…”

Section: -42mentioning

confidence: 99%

Soluble Polyimides Based on Alkyldiaminobenzophenone

Tsuda

Kawauchi

Hiyoshi

et al. 2000

Polym J

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ABSTRACT:The synthesis and characterization of a novel series of soluble polyimides based on alkyldiaminobenzophenone (ADBP) having long chain linear alkyl groups with 9-14 carbon atoms are described. Polyimides containing tetracarboxylic dianhydrides such as 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) and ADBP with even number carbon atoms were soluble in polar solvents such as N-methyl-2-pyrrolidone (NMP), while polyimides containing BTDA and ADBP with odd number carbon atoms (ADBP-9, 11, 13) were insoluble in NMP. These unique odd-even effects of solubility were assumed due to the conformational effects of long chain linear alkyl groups. Soluble copolyimides based on ADBP with conventional aromatic diamine, diaminodiphenylether (DOE) can be obtained. The incorporation ofDDE resulted in increment of molecular weight and improve the thermal stability. Soluble polyimides and copolyimides based on ADBP were soluble in various polar solvents and exhibited high thermal stability in air and nitrogen.KEY WORDS Polyimide / Soluble Polyimide / Alkyldiaminobenzophenone / Odd-Even Effect/ Copolymerization / Thermal Stability/ Solubility/ Polyimides exhibit excellent thermal and mechanical properties and have extensive engineering and microelectronics applications.

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Pretilt Angles of Liquid Crystal on Organic-Solvent-Soluble Polyimide Alignment Films

Cited by 16 publications

References 7 publications

11.1: Polyimide Films Designed to Produce High Pretilt Angles with a Single Linearly Polarized UV Exposure

11.1: Polyimide Films Designed to Produce High Pretilt Angles with a Single Linearly Polarized UV Exposure

Alignment control technology of liquid crystal molecules

Soluble Polyimides Based on Alkyldiaminobenzophenone

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