| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | F. 광기능/디스플레이 재료 분과 |
| 제목 | Fast color switching thermochromic display by molecular printing |
| 초록 | Reflective-type display using thermochromic materials offers several advantages over the conventional optoelectronic technology: a passive circuit element-driven simplified device layout, cost-effectiveness, and clear visibility. An Inherent challenge of chromic displays is slow color transition, which results from the mass-dependent characteristic of chromic inks. A large mass of the thermochormic ink has a large heat capacity requiring more energy to induce color switching. A molecular printing using polymer pen array technique that can reduce the mass of the delivered ink, may offer the ability to effectively control the switching time in a spatially controlled manner. Here, we demonstrate a method for molecular printing of a thermochromic ink with a low heat capacity, enabling an unprecedented, fast color switching without any optoelectronic elements. Molecularly printed ink is patterned on fabricated microheaters that induce transient local heat generation, facilitating local heating and cooling processes. Depending on the concentration of the thermochromic ink, i.e., the number of microcapsuled dyes in the form of a monolayer resulting in a low heat capacity, the chroma of the patterned ink could be increased. Using this technique, the thermochromic ink could be printed over centimeter scales, with CMYK (cyan-magenta-yellow-black) colors at a color-switching rate of 20–500 ms, to be integrated into the thermochromic device prototype for potential display applications. |
| 저자 | 김태영, 심우영 |
| 소속 | 연세대 |
| 키워드 | molecular printing; thermochromic display; color switching time |
