http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Al-15Cu-1Mg 합금의 일방향응고시 로이동속도변화에 따른 응고거동 및 미세조직의 변화
문철희 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.10
14㎝ length Al-15Cu-1Mg alloys in 3㎜ I.D. alumina tubes have been directionally solidified under the furnace temperature of 760℃. Furnace moving velocity(V) was changed with the range 0-120㎝/hr. By analysing the evolution of the temperatures profiles along the specimen length, the growth characteristics-the position of the solid/liquid interface, temperature gradient(G) and local growth velocity(R)-have been examined. The microstructures of the alloys have been observed for the investigation of microstructural uniformity along the specimen length and the effects of the furnace moving velocity(V).
문철희,Moon, C.H. 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.1
플라즈마 디스플레이 패널에서 명실콘트라스트(bright room contrast ratio: BRCR)를 개선하는 방향으로 새로운 전극구조를 설계하였다. 새로운 개념의 전극을 이용하여 블랙매트릭스 패턴의 영역을 넓힐 수 있었으며 이를 통하여 패널면의 반사휘도를 낮출 수 있었다. 제작한 플라즈마 디스플레이 패널에 대하여 방전전압, 방전효율, 휘도 등을 평가하였으며 명실콘트라스트가 크게 개선됨을 확인하였다. A new electrode structure in a plasma display panel was designed in a way to increase the bright room contrast ratio (BRCR). The area of the black matrix pattern to get a low reflection from the panel surface was enlarged using the new electrode design concept. The electrical characteristics such as firing voltage, voltage margin and power consumption were measured. The luminance of the panel was measured and the luminous efficiency was calculated. It was found that the new electrode structure was very effective to enhance the BRCR.
Discharge Characteristics of a Plasma Display using Vertical Auxiliary Electrodes
문철희 한국정보디스플레이학회 2008 Journal of information display Vol.9 No.1
In a conventional plasma display, the bus electrode was located on the ITO electrode at the outer part of each cell. We propose a new electrode configuration using vertical auxiliary electrodes which play a role of electrically connecting ITO and bus electrodes with the aim of enhancing discharge and luminous characteristics of the PDP (Plasma Display Panel). In this paper, luminance and luminous efficiency of the 3 in.-diagonal test panel are measured with various number of vertical auxiliary electrodes such as 2, 50 and 150. The change in the luminous characteristics is explained in connection with the discharge characteristics of the PDP cells such as current peak, IR emission peak and ICCD picture image.
The effect of the cell size on the discharge characteristics of a plasma display panel
문철희 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.1
In this study, plasma display panels with three different cell volumes were prepared by changing the spaces between the vertical barrier ribs into two and three times the reference structure. The discharge gap and area of the segmented ITO electrode were the same for the three cases, and Ne–20%Xe gas was used. The luminance and luminance efficiency were measured using applied voltage variations. The time evolution and intensity distribution of the infrared, which are related to the vacuum ultraviolet, were observed via intensified, charged, coupled device, and the visible-light intensity profiles were observed using PR-900 to analyze the discharge phenomena in the discharge cell.
문철희 대한금속·재료학회 2018 대한금속·재료학회지 Vol.56 No.4
Encapsulation of the flexible OLED devices requires a low temperature process and great barrier characteristics against the permeation of water vapor and oxygen. We suggest a new OLED encapsulation method for the flexible OLED device using a sealing line instead of the TFE encapsulation. For the experiments, polyimide substrate with Cu layer was used. First, 0.5 mm width Cu pattern was formed on the polyimide substrate and sealing material was printed on it, followed by the heating. For the sealing line, two different designs are compared. First, a mixture of LMPA and epoxy was investigated to develope the LMPA-epoxy double line structure. In this case, control of the spreadability of the epoxy was a key issue, as the epoxy spread out on the polyimide substrate when the viscosity was low, therefore, various ways were tried to control the spreadability of the polymer. Secondly, LMPA single line was manufactured and the reliability characteristics such as adhesion, bending characteristics and WVTR(water vapor transmission ratio) were investigated and compared with the double line structure.
은 인쇄 전극과 PEI 접착 층을 사용한 용액공정 OLED
문철희 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.3
We demonstrated a bonding technology using polyethyleneimine (PEI) as a bonding layer betweenprinted Ag electrodes and an emission material layer (EML) to fabricate all-solution-processed Organic Light-Emitting Diodes (OLEDs). We manufactured Ag electrodes on a glass substrate by the screen printing method,which was bonded to another substrate with ITO anodes and an EML layer using a PEI layer. Since thebonding layer needs to have both good bonding characteristics and electrical conductivity, we investigated howboth characteristics were affected by some experimental factors, namely, PEI concentration, the thickness ofthe layer and additives. The bonding strength and the electrical current density were investigated by tensiletests and electron only device (EOD) experiments, respectively. The results showed that at higher PEIconcentration the bonding strength reached a higher value, but the electrical current through the PEI layerdecreased rapidly with increased PEI layer thickness. When sorbitol was added into the PEI solution, bothbonding strength and electrical conductivity were improved, and when 10 wt% of sorbitol was added into 0.1wt% PEI solution, the device showed an electrical current density of 1,000 mA/cm2 and a good bondingstrength also. Finally, we manufactured a two-substrate OLED device using the bonding layer and measuredthe luminance, which revealed that the device turned on at 4 V and the maximum luminance was 7,000 cd/m2. These data, both electrical and optical, demonstrate the potential to fabricate all-solution-processed OLEDsusing the two-substrate bonding technology.
문철희 湖西大學校 工業技術硏究所 2005 工業技術硏究所論文集 Vol.24 No.-
PDP (Plasma Display Panel) consists of two glass plates on which electrodes and dielectric layers are placed. Each pixels are separated with barrier ribs and emit visible lights by plasma of discharge gases inside and photo-luminescence of phosphors coated on the barrier ribs. In this experiments, 3 inch cell structure was designed and laboratory facilities for manufacturing PDP panel were built up. 3 inch PDP panel was manufactured with these facilities.