• Title/Summary/Keyword: Research center

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Measurement of Energy bands of the MgO Layer in AC-PDPs

  • Jeoung, S.J.;Lee, H.J.;Son, C.G.;Kim, J.H.;Park, E.Y.;Hong, Y.J.;You, N.L.;Lee, S.B.;Han, Y.G.;Jeoung, S.H.;Song, K.B.;Moon, M.W.;Oh, P.Y.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.906-909
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    • 2006

  • The secondary electron emission coefficient $({\gamma})$ of the cathode is an important factor for improving the discharge characteristics of AC-PDPs because of its close relationship to discharge voltage. In AC-PDPs, MgO is most widely used as a surface protective layer. In this experimental, we have investigated the electronic structure of the energy band structure of the MgO layer responsible for the high ${\gamma}$. The MgO layers have been deposited by electron beam evaporation method, where the $O_2$ partial pressures have been varied as 0, $5.2{\times}10^{-5}$ torr, $1.0{\times}10^{-4}$ torr, and $4.1{\times}10^{-4}$ torr, in this experiment. It is noted that work function that is energy gap between surface and first defect level of MgO layer has the lowest value for the highest O2 partial pressure of $4.1^{\ast}10^{-4}$ Torr.

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Influence of the degradation of MgO protective layer on the Surface profiles and discharge characteristics in AC-PDP.

  • Lee, Soo-Beom;Jeoung, J.M.;Ko, B.D.;Oh, P.Y.;Moon, M.W.;Lee, J.H.;Lim, J.E.;Lee, H.J.;Han, Y.G.;Yoo, N.L.;Jeoung, S.H.;Son, C.G.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1207-1210
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    • 2005

  • The MgO protective layer provides protection from the discharge, lowers the discharge voltage and prolongs the AC-PDP lifetime. We have investigated the characteristics of degradation of MgO protective layer, which correlates to the image-sticking[1] and the lifetime in AC-PDP. The degraded MgO have been changed the surface morphology of MgO. It was found that panel lifetime depended on degradation of MgO protective.

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Genotoxicity Study of Water Extract of Cordyceps militaris Grown Upon Protuetja dreujtarsis (굼벵이 유래 밀리타리스 동충하초 열수 추출물의 유전독성평가)

  • Jo, Wol-Soon;Nam, Byung-Hyouk;Choi, Yoo-Jin;Oh, Su-Jung;Kang, Eun-Young;Lee, Sang-Ho;Jeong, Min-Ho
    • Toxicological Research
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    • v.23 no.3
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    • pp.245-251
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    • 2007

  • Water extract of Cordyceps militaris grown upon Protuetja dreujtarsis (CMPD) was examined for the genetic toxicity-bacterial mutagenicity, chromosome aberration, and micronucleus formation. For mutagenicity assay, bacterial reversion test with Salmonella typhimurium TA98, TA100, TA1535, TA 1537, and E. coli WP2uvrA were performed. The extract at the concentrations of $50{\sim}5,000{\mu}g/plate$ did not induce mutagenicity at all. Chromosome aberration test was performed by using Chinese lung (CHL) cells. There was no significant chromosome aberration in CHL cells with S-9 mixture at the concentrations of $312.5{\sim}1,250{\mu}g/ml$ of the extract and without S-9 mixture at the concentrations of $1.2{\sim}19.5{\mu}g/ml$ of the extract. For micronucleus test, ICR mice were treated with the extract at the dose of 0.5, 1, and 2g/Kg. The frequencies of the micronucleated polychromatic erythrocytes (MNPCE) in bone marrow preparations of the extract-treated group were not increased compared to the untreated control group. Taken together, our results show that water extract of CMPD did not induce any harmful genotoxicity.

  • https://doi.org/10.5487/TR.2007.23.3.245 인용 PDF KSCI

A study of characteristics for Image sticking in AC - Plasma Display Panel

  • Han, Yong-gyu;Lee, S.B.;Jeong, S.H.;Son, C.G.;Yoo, N.L.;Lee, H.J.;Lim, J.E.;Lee, J.H.;Jeoung, J.M.;Ko, B.D.;Oh, P.Y.;Moon, M.W.;Choi, Eun-Ha
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.263-265
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    • 2005

  • In the alternative current plasma display panel(AC-PDP) technology, it is very important to remove the image sticking for improving an image quality. In this paper, we have investigated the driving method of alternative current plasma display panel(AC-PDP) for preventing image sticking. We have investigated the driving method of alternative current plasma display panel(AC-PDP) for preventing image sticking. The preventing method of image sticking was proposed by adopting the Sticking Remove Pulse(SRP). The variation of brightness is most affected by the MgO to be formed at the surface of the phosphor layer. As a result, the image sticking is reduced when the driving method adopted an SRP.

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