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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

LC pretilt angle according to exposure time at optimized ion beam parameters.
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Figure 4: LC pretilt angle according to exposure time at optimized ion beam parameters.

Mentions: Based on the relationship between the ion beam exposure condition and the pretilt angle indicated in Figure 2, to enlarge the margin of LC pretilt control by ion beam irradiation, the ion beam conditions for our ion beam equipment were optimized and were 70 eV, 20 μA/cm2, and 10°. In our ion beam equipment, ion beam irradiation with an ion beam energy under 70 eV generated a large fluctuation of beam current. Figure 4 shows the change of the LC pretilt according to exposure time at the optimized condition. As you see, we can know that the LC pretilt margin is enlarged extensively compared with Figure 2. We would get a larger margin of the LC pretilt if we could have a better one.


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)

LC pretilt angle according to exposure time at optimized ion beam parameters.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: LC pretilt angle according to exposure time at optimized ion beam parameters.
Mentions: Based on the relationship between the ion beam exposure condition and the pretilt angle indicated in Figure 2, to enlarge the margin of LC pretilt control by ion beam irradiation, the ion beam conditions for our ion beam equipment were optimized and were 70 eV, 20 μA/cm2, and 10°. In our ion beam equipment, ion beam irradiation with an ion beam energy under 70 eV generated a large fluctuation of beam current. Figure 4 shows the change of the LC pretilt according to exposure time at the optimized condition. As you see, we can know that the LC pretilt margin is enlarged extensively compared with Figure 2. We would get a larger margin of the LC pretilt if we could have a better one.

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