title: Overlay accuracy on a flexible web with a roll printing process based on a roll-to-roll system.
abstract: For high-quality flexible devices from printing processes based on Roll-to-Roll (R2R) systems, overlay alignment during the patterning of each functional layer poses a major challenge. The reason is because flexible substrates have a relatively low stiffness compared with rigid substrates, and they are easily deformed during web handling in the R2R system. To achieve a high overlay accuracy for a flexible substrate, it is important not only to develop web handling modules (such as web guiding, tension control, winding, and unwinding) and a precise printing tool but also to control the synchronization of each unit in the total system. A R2R web handling system and reverse offset printing process were developed in this work, and an overlay between the 1st and 2nd layers of ±5μm on a 500 mm-wide film was achieved at a σ level of 2.4 and 2.8 (x and y directions, respectively) in a continuous R2R printing process. This paper presents the components and mechanisms used in reverse offset printing based on a R2R system and the printing results including positioning accuracy and overlay alignment accuracy.
authors.affiliation: Samsung Display, Nongseo-Dong, Giheung-Gu, Yongin 446-711, South Korea.
authors.forename: Jaehyuk
authors.initials: J
authors.lastname: Chang
authors.affiliation: Samsung Electronics, Samsungjeonja-Ro, Hwaseong 445-701, South Korea.
authors.forename: Sunggun
authors.initials: S
authors.lastname: Lee
authors.affiliation: Samsung Display, Nongseo-Dong, Giheung-Gu, Yongin 446-711, South Korea.
authors.forename: Ki Beom
authors.initials: KB
authors.lastname: Lee
authors.affiliation: Samsung Electronics, Samsungjeonja-Ro, Hwaseong 445-701, South Korea.
authors.forename: Seungjun
authors.initials: S
authors.lastname: Lee
authors.affiliation: Changwon National University, Changwondaehak-Ro, Changwon 641-773, South Korea.
authors.forename: Young Tae
authors.initials: YT
authors.lastname: Cho
authors.affiliation: Samsung Electronics, Samsungjeonja-Ro, Hwaseong 445-701, South Korea.
authors.forename: Jungwoo
authors.initials: J
authors.lastname: Seo
authors.affiliation: Samsung Electronics, Samsungjeonja-Ro, Hwaseong 445-701, South Korea.
authors.forename: Sukwon
authors.initials: S
authors.lastname: Lee
authors.affiliation: Samsung Display, Nongseo-Dong, Giheung-Gu, Yongin 446-711, South Korea.
authors.forename: Gugrae
authors.initials: G
authors.lastname: Jo
authors.affiliation: Samsung Display, Nongseo-Dong, Giheung-Gu, Yongin 446-711, South Korea.
authors.forename: Ki-yong
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Samsung Display, Nongseo-Dong, Giheung-Gu, Yongin 446-711, South Korea.
authors.forename: Hyang-Shik
authors.initials: HS
authors.lastname: Kong
authors.affiliation: Korea Institute of Machinery & Materials, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 305-343, South Korea.
authors.forename: Sin
authors.initials: S
authors.lastname: Kwon