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Korean Journal of Metals and Materials > Volume 56(4); 2018 > Article
Korean Journal of Metals and Materials 2018;56(4): 313-320. doi: https://doi.org/10.3365/KJMM.2018.56.4.313
실링라인을 이용한 플렉시블 OLED 봉지
호서대학교 디지털디스플레이공학과
Encapsulation of a Flexible OLED Using a Sealing Line
Cheol-Hee Moon
School of Display Engineering, Hoseo University, Asan 31499, Republic of Korea
Correspondence  Cheol-Hee Moon ,Tel: +82-41-540-5923, Email: chmoon@hoseo.edu
Received: 1 November 2017;  Accepted: 1 February 2018.  Published online: 5 April 2018.
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.
Keywords: flexible, OLED(Organic light emitting diode), encapsulation, sealing, barrier, LMPA(Low melting point alloy)
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