Limits...
Zenithal alignment of liquid crystal on homeotropic polyimide film irradiated by ion beam.

Choi Y, Yoon TH, Kwon JH, Yi J, Gwag JS - Nanoscale Res Lett (2012)

Bottom Line: Increasing irradiating energy, we could control the pretilt from 90° to 1° with several steps.To confirm it, contact angle measurement was carried out.With this result, we can easily control the LC pretilt in the pixel with appropriate exposure conditions which is critical to achieve excellent electrooptic characteristics and good image quality.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Yeungnam University, 214-1 Dae-dong, Gyeongsan 712-749, South Korea. sweat3000@ynu.ac.kr.

ABSTRACT
We investigate the pretilt characteristics of a nematic liquid crystal [LC] in terms of ion beam exposure conditions on the homeotropic polyimide alignment layer. The pretilt angle of LCs in the case of high-energy ion beam treatment was decreased considerably almost the same to that of the homogenous alignment layer though we used homeotropic polyimide film at first. Increasing irradiating energy, we could control the pretilt from 90° to 1° with several steps. We believe that this is because the side chain with hydrophobicity in the used polyimide is broken by ion beam exposure. To confirm it, contact angle measurement was carried out. With this result, we can easily control the LC pretilt in the pixel with appropriate exposure conditions which is critical to achieve excellent electrooptic characteristics and good image quality.

No MeSH data available.


Related in: MedlinePlus

The chemical structure of the polyimide AL-00010 used as the LC alignment layer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3278366&req=5

Figure 1: The chemical structure of the polyimide AL-00010 used as the LC alignment layer.

Mentions: The glass substrates coated with indium tin oxide whose size is 30 mm × 20 mm × 0.7 mm are spin-coated with the polyimide AL-00010, which is provided by Japan Synthetic Rubber Corporation (Minato-ku, Tokyo, Japan). It subsequently was prebaked at 80°C for 3 min to remove the solvent and cured at 230°C for 30 min for polymerization on a hot plate. Figure 1 shows the chemical structure of the polyimide AL-00010. In general, the pretilt angle of LCs is determined mainly by the chemical property of the side chain in the polyimide. Since the side chain in the AL-00010 has hydrophobicity with a nonpolar molecule, we can easily know that it may align LCs vertically.


Zenithal alignment of liquid crystal on homeotropic polyimide film irradiated by ion beam.

Choi Y, Yoon TH, Kwon JH, Yi J, Gwag JS - Nanoscale Res Lett (2012)

The chemical structure of the polyimide AL-00010 used as the LC alignment layer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3278366&req=5

Figure 1: The chemical structure of the polyimide AL-00010 used as the LC alignment layer.
Mentions: The glass substrates coated with indium tin oxide whose size is 30 mm × 20 mm × 0.7 mm are spin-coated with the polyimide AL-00010, which is provided by Japan Synthetic Rubber Corporation (Minato-ku, Tokyo, Japan). It subsequently was prebaked at 80°C for 3 min to remove the solvent and cured at 230°C for 30 min for polymerization on a hot plate. Figure 1 shows the chemical structure of the polyimide AL-00010. In general, the pretilt angle of LCs is determined mainly by the chemical property of the side chain in the polyimide. Since the side chain in the AL-00010 has hydrophobicity with a nonpolar molecule, we can easily know that it may align LCs vertically.

Bottom Line: Increasing irradiating energy, we could control the pretilt from 90° to 1° with several steps.To confirm it, contact angle measurement was carried out.With this result, we can easily control the LC pretilt in the pixel with appropriate exposure conditions which is critical to achieve excellent electrooptic characteristics and good image quality.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Yeungnam University, 214-1 Dae-dong, Gyeongsan 712-749, South Korea. sweat3000@ynu.ac.kr.

ABSTRACT
We investigate the pretilt characteristics of a nematic liquid crystal [LC] in terms of ion beam exposure conditions on the homeotropic polyimide alignment layer. The pretilt angle of LCs in the case of high-energy ion beam treatment was decreased considerably almost the same to that of the homogenous alignment layer though we used homeotropic polyimide film at first. Increasing irradiating energy, we could control the pretilt from 90° to 1° with several steps. We believe that this is because the side chain with hydrophobicity in the used polyimide is broken by ion beam exposure. To confirm it, contact angle measurement was carried out. With this result, we can easily control the LC pretilt in the pixel with appropriate exposure conditions which is critical to achieve excellent electrooptic characteristics and good image quality.

No MeSH data available.


Related in: MedlinePlus