| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 기능성 고분자 |
| 제목 | Plastic Substrate for Flexible Display |
| 초록 | A plastic substrate for flexible display is developed. The gas barrier and optical properties of the substrate is improved through depositing silicon oxide/nitride layer and coating polymer layer on plastic film by sputtering process and wet coating process. Roll to roll processes will guarantee the productivity in the whole production process of the plastic substrate. We produced the PES film having a superior resistance to heat and excellent optical properties such as optical retardation, transmittance, haze, and yellow index. The optical transmittance was 88% at 550 nm, retardation below 8 nm, haze below 0.3 %, yellow index below 2.5, and surface roughness below 5 nm of 200 um PES film. An inorganic layer was deposited for effective gas barrier layer. We used silicon oxide or silicon nitride material as gas barrier material. The silicon oxide layer has good optical transmittance but showed inferior gas barrier property. The silicon nitride layer shows excellent gas barrier property but inferior optical transmittance[6]. Therefore we try coat organic layer of low refractive index compared to the inorganic layer on silicon nitride layer. The common thickness is 15-20nm for silicon oxide and silicon nitride. The UV polymerisable urethane acrylate is used as top coating layer. The refractive index of the acrylate polymer is about 1.5. The polymer layer on silicon nitride film increases optical transmittance of barrier film. The polymer coated plastic substrate shows excellent scratch resistance and solvent resistance. Table 1 shows the physical properties of the inorganic coated PES film and the polymer coated barrier film. The gas barrier property of developed plastic substrate is about 0.01 g/m2/day and optical transmittance is 90%. References 1. Y. Okada et al, “A 4-inch Reflective Color TFT-LCD Using a Plastic substrate”, SID’02 DIGEST, pp1204 2. S. Aomori et al, “Reflective MIM-LCD Using a Plastic Substrate”, SID’01 DIGEST, pp558 3. P. Cirkel et al, “Towards flexible AMLCD’s”, IDW’02, pp311 4. T. Hanada et al, “Flexible Plastic Substrate for Flat Panel Displays”, IDW’02, pp401 5. M. Okamoto et al, “Development of a Color Reflective TFT-LCD Using Plastic Substrate”, IDW’02, pp315 6. D. Chahroudi, “Transparent Glass Barrier Coatings for Flexible Film Packaging”, Society Vacuum Coaters 1991, pp130 Table 1. Physical properties of inorganic coated PES films and polymer coated barrier film (R1: WVTR of treated sample, R0: WVTR of non-treated sample) |
| 저자 | 황희남, 최재문, 염은희, 박용호, 김인선 |
| 소속 | (주)아이컴포넌트 |
| 키워드 | plastic substrate; flexible display |
