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이형직,송두규,권혁병,정해경,윤상옥,이형복,이홍림 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
소결첨가제나 바인더를 넣지않고 만든 무첨가 PZT 분말 성형체를 플라즈마 소결-로 열처리 후의 미세조직의 변화, PbO의 거동 그리고 이에 따른 유전특성을 로소결한 경우와 비교하여 다음과 같은 결과를 얻었다. 플라즈마 소결-로 열처리로 만든 PZT 시편이 로 소결 시편과 비교하여 입성장이 크게 일어나지 않은 미세조직을 나타내었으며, 또한 균일한 Pb, Zr, Ti 성분분포를 보였다. 유전특성에 있어서는 1kHz에서 20%정도의 유전율의 향상을 얻을 수 있었으며 유전소실 또한 40%정도 낮출 수 있었다. 상기의 결과는 DC 플라즈마 소결법의 특징인 소결초기의 급속가열 효과와 PbO의 증발 억제 효과에 의한 것으로 고려된다. PZT powder compacts without additives and binder were processed by plasma sintering-furnace annealing. Microstructures, PbO behaviour and dielectric properties were investigated, and compared to the specimen obtained by furnace sintering. The specimen prepared by plasma sintering-furnace annealing showed more not only fine microstructures but also homogeneous pb, Zr, Ti composition distribution, and revealed 20% higher dielectric constant as well as 40% lower dielectric loss (measured at 1kHz). Above results might be considered to be caused by rapid heating effects, high temperature sintering effects and preventing effects of PbO evaporation characterized by dc plasma sintering.
Vacuum In-line Sealing Technology of the Screen-printed CNT-FEA
Kwon, Sang-Jik,Kim, Tae-Ho,Shon, Byeong-Kyoo,Cho, Euo-Sik,Lee, Jong-Duk,Uh, Hyung-Soo,Cho, Sung-Hee,Lee, Chun-Gyoo The Korean Infomation Display Society 2003 Journal of information display Vol.4 No.3
We have fabricated a carbon nanotube field emission display (CNT-FED) panel with a 2-inch diagonal size by using a screen printing method and vacuum in-line sealing technology. The sealing temperature of the panel was around 390$^{\circ}C$ and the vacuum level was obtained with 1.4x$10^{-5}$torr at the sealing. When the field emission properties of a fabricated and sealed CNT-FED panel were characterized and compared with those of the unsealed panel which was located in a test chamber of vacuum level similar with the sealed panel. As a result, the sealed panel showed similar I-V characteristics with unsealed one and uniform light emission with very high brightness at a current density of 243 ${\mu}A/cm^2$, obtained at the electric field of 10 V/${\mu}m$.
Characterization of PDP Performance Prepared by Vacuum In-line Sealing Technology
Kwon, Sang-Jik,Kim, Jee-Hoon,Whang, Ki-Woong The Korean Infomation Display Society 2003 Journal of information display Vol.4 No.4
By using vacuum in-line driving and photoluminescence measuring system, we have examined the electrical and optical characteristics of plasma display panel produced by vacuum in-line sealing technology. In addition, the relationship between luminous efficiency and base vacuum level before filling discharge gas was analyzed. In the case of base vacuum level of $1.33{\times}10^{-1}$ Pa, the firing voltage of a 2-inch diagonal PDP panel was ranged from 312 to 343 V depending on the discharge gas pressure of $2.667{\times}10^4$ to $4{\times}10^4$ Pa at room temperature, Whereas in the case of $1.33{\times}10^{-4}$ Pa, the firing voltage was reduced by 40 V and luminescence was improved slightly.
Kwon, Sang-Jik,Jang, Chan-Kyu The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.4
Effects of base vacuum level on the electrical and optical characteristics of the plasma display panel (PDP) were investigated. The relationship between efficiency and base vacuum level before filling discharge gas was analyzed. For the base vacuum level of $1{\times}10^{-4}$ torr, firing voltage of a 2-inch diagonal PDP panel was 232 V at the discharge gas pressure of 400 torr and luminous efficiency was 1.5 lm/W at 180V sustaining pulse. On the other hand for $1{\times}10^{-6}$torr, the firing voltage was reduced to 215 V and luminous efficiency was improved considerably to 2.5 lm/W. We successfully demonstrated the smooth operation of tip-less PDP fabricated using vacuum in-line sealing method.
0.7 inch FED Panel system build-up by using proper sealing process
Kwon, Sang-Jik,Hong, Kun-Jo,Cho, Tae-Hee,Lee, Jong-Duk,Oh, Chang-Woo,Kwon, Yong-Bum The Korean Vacuum Society 1999 Journal of Korean Vacuum Science & Technology Vol.3 No.1
FDE panel was successfully fabricated through the integration of a 0.7" diagonal Si-based Mo-tip FEA with 25${\times}$25 pixels, Y2O3:Eu or ZnO:Zn phosphor screen, and vacuum sealing through an exhausting glass tube, including a getter. The panel system was driven by an external driver circuit having pulse width modulation(PWM) driving scheme. Before character imaging, it was stabilized through tip aging by slowly increasing a pulse-mode emission current and phosphor aging by a coulombic charging process. After aging, luminescent characteristics such as emission uniformity, charging and arcing phenomena were shown to be improved significantly.
A Low Temperature Vacuum In-Line Sealing Technology for the High Performance PDP
Sang Jik Kwon,Jee-Hoon Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Sealing of the two glass plates comprising a plasma display panel (PDP) was done in a vacuum chamber by using an auxiliary heating line (AHL). In order to improve the uniformity of the sealing temperature and to reduce the panel temperature during sealing, we introduced an AHL under a frit glass by using a screen printing method, and we used it as part of the heating source for the frit melting. Although outgassing and bubbling can be severe problems during the heating process of frit glass inside a vacuum chamber, our specially prepared frit glass was successfully applied for vacuum in-line sealing without bubbles. During the sealing, the panel temperature was maintained at 250 C, and the local frit temperature was controlled at a sealing temperature around 350 C by applying a voltage to the AHL. By using the AHL technology and the specially prepared frit glass, we sealed an operational PDP panel with 2-inch-diagonal active area. The panel was successfully operated with continuous sustained 50-kHz pulses and gave a brilliant emission of light.
0.7 inch FED Panel system build - up by using proper sealing process
Sang Jik Kwon,Kun Jo Hong,Tae Hee Cho,Jong Duk Lee,Chang Woo Oh,Yong Bum Kwon 한국진공학회(ASCT) 1999 Journal of Korean Vacuum Science & Technology Vol.3 No.1
FED panel was successfully fabricated through the integration of a 0.7″ diagonal Si-based Mo-tip FEA with 25×25 pixels, Y₂O₃:Eu or ZnO:Zn phosphor screen, and vacuum sealing through an exhausting glass tube, including a getter. The panel system was driven by an external driver circuit having pulse width modulation(PWM) driving scheme. Before character imaging, it was stabilized through tip aging by slowly increasing a pulse-mode emission current and phosphor aging by a coulombic charging process. After aging, luminescent characteristics such as emission uniformity, charging and arcing phenomena were shown to be improved significantly.
Sang Jik Kwon,Chan Kyu Jang 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
The effects of the base vacuum level on the electrical and optical characteristics of a plasma display panel (PDP) were investigated. We found that the main impurity gases remaining inside a PDP panel during a pumping cycle consisted of H2O, CO2, CO, N2, and O2 that the amounts of these impurity gases rapidly decreased as the vacuum level was increased, especially near 10−5 Torr. After the pumping process, a discharge gas of Ne-Xe(4 %) was introduced inside the panel. The relationship between the luminous efficiency and the base vacuum level was analyzed. For a base vacuum level of 1 × 10−4 Torr, the firing voltage of a 2-inch diagonal PDP panel was 232 V at a discharge gas pressure of 400 Torr, and the luminous efficiency was 1.5 lm/W for a 180 V sustaining pulse. However, for 1 × 10−6 Torr, the firing voltage was reduced to 215 V, and the luminous efficiency was improved considerably to 2.5 lm/W. We successfully demonstrated the operation of a tipless PDP fabricated using a vacuum in-line sealing method.