초록 ▼

유기 디스플레이용 기판 및 기체투과방지막 기술 개발o내열성 150℃를 확보한 신규 기판- polysulfone 필름 개발(Tg =190℃)o열처리 공정 연구o기판의 광학투과도를 증가시키기 위하며 anti-reflection 연구: 특허 출원o기체투과방지막에 관련 연구를 진행하여 표면 처리 공정을 통하여 표면 에너지 증가 (최대 63dyne/cm)o무기물 증착 시 나타나는 ？？ 현상 등 스트레스를 극복하기 위한 유기물 buffer층에 관한 연구를 진행하고 무기물을 코팅하여 기체투과도를 향상o기체투과방지막 특성: 수분에 대하여 Moco

유기 디스플레이용 기판 및 기체투과방지막 기술 개발o내열성 150℃를 확보한 신규 기판- polysulfone 필름 개발(Tg =190℃)o열처리 공정 연구o기판의 광학투과도를 증가시키기 위하며 anti-reflection 연구: 특허 출원o기체투과방지막에 관련 연구를 진행하여 표면 처리 공정을 통하여 표면 에너지 증가 (최대 63dyne/cm)o무기물 증착 시 나타나는 ？？ 현상 등 스트레스를 극복하기 위한 유기물 buffer층에 관한 연구를 진행하고 무기물을 코팅하여 기체투과도를 향상o기체투과방지막 특성: 수분에 대하여 Mocon test 범위 이하의 $(10\^{-3} g/m²day 이하)$로 우수한 특성 확인고분자 필름 기판의 기능성 박막 형성 및 특성 평가oPassivation용 유기물 및 무기물 단위박막 형성 및 특성 평가- 무기물 : SiO₂(e-beam evaporation, solution),$Ta₂O\_{5}$/유기물 : Polyimide, parylene, acryl 계열- 투습율 : 0.43 g/m²ㆍday (SiO₂, 100nm)oPassivation용 유기물-무기물 혼합구조 형성 및 특성 평가- 무기물 : SiO₂(e-beam evaporation), SiON(sputter)/유기물 : Polyimide, parylenee, acryl 계열- 투습율 : 0.19 g/m²ㆍday (polyimide/SiO₂) ,0.1 g/m²ㆍday (polyimide/SiO₂/polyimide/SiO₂) ＜ $10\^{-3} g/m^{2}{\cdot}day$ (polyimide/SiON/SiO₂)(parylen/SiO₂/SiON) ; (acryl/SiON/acryl/SiON )oPassivation을 이용한 유기TFT 및 유기EL 안정성 향상 평가- 유기TFT : SiO₂ passivation off current 및 threshold voltage 안정성(stabili쇼) 분석- 유기EL : parylene, parylene-SiO₂ passivation dark spot 발생 억제 및 수명 향상oPassivation 박막의 기계적 응력 분석 및 안정성 향상- Bending 상태에서의 다양한 구조의 passivation 박막의 응력 모델 정립- passiuation 구조를 이용한 하부 소자의 응력 감소 (crack 발생 : 기존 5% 이하)신규 플라스틱 기판 및 소재 개발oPolyethersulfone에 나노복합화하며 수분차단성이 기존 수지보다 40% 향상시킨 기판재료 개발oPolysulfone을 기판 재료로 적용하기 위하여 주쇄에 경화성기를 도입하여 내화학성을 현저히 개선, 나노복합화하며 BIF 2이상 향상o무색 투명(〉89%)하AU 내열성이 270℃ 이상인 방향족 polyimide를 제조, 나노복합화하여 BIF 2 이상 개선o나노복합화에 의해 CTE를 30 ppm/℃ 이하로 낮춘 기판 재료 개발

Abstract ▼

Flexible display technology is now under intensive investigation because of the advantages in flat panel displays, such as extremely thin thickness and mechanical flexibility. However, the materials currently used in displays are very sensitive to moisture and oxygen, and the polymer substrates have

Flexible display technology is now under intensive investigation because of the advantages in flat panel displays, such as extremely thin thickness and mechanical flexibility. However, the materials currently used in displays are very sensitive to moisture and oxygen, and the polymer substrates have very low barrier properties. Hence, in order to achieve a long lifetime devices, high performance barrier coating for the substrate and a proper encapsulation technology must be developed.In addition, display manufacturing process has to be microscopically defined so that thermal expansion of plastic film substrate may not be suitable for such process. To overcome the shortcoming a new film material has to be investigated in order to ensure a low thermal expansion of the film. Fot the purpose, new material development research has been carried out In the research, colorless polyimides as well as polysulfones with curable functional groups were developed with an aim to give high temperature stability as well as low thermal expansion coefficient.Generally, a multi-layer structure with organic/inorganic layers is widely studied for high quality barrier coatings. Here, the organic layers will cover the defects (pinholes, micro-cracks) created in inorganic layers which are produced during the deposition process. In present work, we developed a new structure for high quality barrier coating which has a simple three-layered structure of organic/inorganic/inorganic layers. A thin film passivation structure for enhanced stability of flexible displays was investigated. The thin film passivation structure is composed of a three-layered structure of organic/inorganic/inorganic layers. By using this structure, high performance barrier properties were observed $(<5x10\^{-3} g/m^{2}{\cdot}day)$, where polyimide or parylene was used as the organic layer, silicon oxide (SiO₂) and silicon oxynitride (SiON) as the first and second inorganic layers, respectively. Also, it was found that the lifetime of flexible OLED was improved by using the passivation layers.Due to high gas permeation of plastic film, the flexible display''s life time is yet to reach a product life span. To overcome such shortcoming, plastic films requires gas barriers. In this project, systematic analysis on the materials and process have been carried out. The achieved barrier, in terms of WVTR, is beyond limit of Mocon Test.