• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.508-510
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• 2002

We studied the liquid crystal (LC) alignment capabilities and the generation of pretilt angles with ion beam exposure on a diamond like carbon (DLC) layer. A high pretilt angle of 3.5$^{\circ}$ with ion beam exposure on the DLC layer can be obtained. A high pretilt angle in NLC by ion beam alignment method on the DLC layer can be achieved.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.376-376
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• 2007

In Liquid Crystal Display (LCD) manufacturing, the organic over coat materials over coat materials for insulation layer of color filter with acryl ate was widely used. Therefore, we approach that the organic overcoat material can use to insulation layer for color filter and liquid crystal (LC) alignment layer in this research. The LC aligning capabilities was successful stuided for the first time. The organic overcoat layer and polymer layer was coated by spin-coating. In order to characterize the LC alignment, electric optic and residual DC and atomic force microscopy (AFM) image was used. The good LCD aligning capabilities treated on the organic overcoat thin film surfaces with ion beam exposure of $45^{\circ}$ above ion beam energy density of 1200 eV can be achieved. Also the good LCD alignment capabilities treated polymer on surfaces with ion beam exposure of $45^{\circ}$ above ion beam energy density of 1800 eV can be achieved. Comparing electro-optical characteristics between the Polyimide (PI) and the overcoat, the resultant transmittance of the overcoat considerably matched that of the PI and the residual DC also exhibited similar features with the PI.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2009.05a
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• pp.105-105
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• 2009

• Journal of the Korean Vacuum Society
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• v.8 no.1
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• pp.43-50
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• 1999

We have studied the alignment and the lattice quality of hexagonal rings of h-BN films synthesized by ion beam assisted deposition (IBAD) method. Boron was e-beam evaporated at 1.5 $\AA$/sec and nitrogen gas was ionized using end-hall type ion gun at 60, 80, and 100 eV, respectively. Substrate was either not heated or heated at 200, 400, 500, and $800^{\circ}C$, respectively. As nitrogen ion energy increases, c-axes of hexagonal rings tend to align parallel to the substrate, which is explained by larger compressive stress at higher ion energies. Alignment of c-axis increases with temperature and shows maximum around $400^{\circ}C$. The lattice quality of hexagonal rings improves with temperature. Such behaviors can be understood from two counter trends of increasing the atomic mobility and decreasing compressive stress with temperature. Hardness of h-BN films shows the same trend with the alignment of c-axis. Ion beam assisted deposition method seems to be effective for aligning hexagonal rings and optimizing h-BN properties.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.409-412
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• 2002

We found that polyimide surfaces bombarded by a low energy argon ion beam align liquid crystals. The pretilt angle of the liquid crystals is controlled by ion beam parameters, such as the energy of the incident ions, the angle of incidence, exposure time and current density. The alignment direction of liquid crystal on substrates corresponded to ion beam direction. By argon ion beam the pretilt angle of the liquid crystals was controlled between $0.5^{\circ}$ and $4^{\circ}$for SE-3140 under the proper conditons. By the atomic force microscope (AFM), polyimide surfaces before and after bombarded by ion beam are compared.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.04b
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• pp.118-120
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• 2002

Electro-optical (EO) characteristics of the ion beam (IB) aligned twisted nematic (TN)-liquid crystal display (LCD) with oblique ion beam exposure on the diamond-like carbon (DLC) thin film surface were studied. An excellent voltage-transmittance (V-T) curve of the ion beam aligned IN-LCD was observed with oblique ion beam exposure on the DLC thin film surface for I min. Also, a faster response time for the ion beam aligned TN-LCD with oblique ion beam exposure on the DLC thin film surface for 1 min can be achieved.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.10
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• pp.1100-1106
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• 2004

In this paper, we intend to make fringe-field switching (FFS) mode cell by the ion beam (IB) alignment method on the a-C：H thin film, to analyze electro-optical characteristics in this cell. We studied on the suitable inorganic thin film for fringe-field switching (FFS) cell and the aligning capabilities of nematic liquid crystal (NLC) using the alignment material of a-C：H thin film as working gas at 30 W rf bias condition. A high pretilt angle of about 5 $^{\circ}C$ by ion beam (IB) exposure on the a-C：H thin film surface was measured. Consequently, the high pretilt angle and the good thermal stability of LC alignment by the IB alignment method on the a-C：H thin film surface as working gas at 30 W rf bias condition can be achieved. An excellent voltage-transmittance (V -T) and response time curve of the IE-aligned FFS-LCD was observed with oblique IB exposure on the a-C：H thin films. Also, AC V-T hysteresis characteristics of the IB-aligned FFS-LCD with IE exposure on the a-C：H thin films is almost the same as that of the rubbing-aligned FFS cell on a polyimide (PI) surface.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.05a
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• pp.198-201
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• 2004

We studied the nematic liquid crystal (NLC) aligning capabilities using the new alignment material of a SiO thin film. The homogenous alignment can be obtain어 using ion beam (IB) exposure on the SIO thin film, when positive type NLC ($Delta\varepsilon$>0) was injected However, the homeotropic alignment can be obtained using ion beam (IB) exposure on the SiO thin film, when negative type NLC ($\Delta\varepsilon$>0) was injected The LC aligning ability on the SiO thin film depends on the dielectric anisotropy type of LC. It will be discussed.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.513-514
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• 2008

The potential of non-rubbing technology for applying to display devices was demonstrated by irradiating a high density argon ion beam (IB) on a polyimide (PI) as a liquid crystal alignment layer. The superior electro-optical characteristics were obtained, compared to rubbed PI, Although the low pretilt angle was created on the IB irradiated PI.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1114-1117
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• 2004

We investigated the liquid crystal (LC) alignment phenomena using hydrogenated amorphous carbon (a-C:H) thin films. For LC alignment, the surface of a-C:H thin films is treated with low energy ion beam. We investigated the relationship between the properties of a-C:H thin films and LC alignment phenomena.