公开(公告)号：US20210198439A1

公开(公告)日：2021-07-01

申请号：US16888325

申请日：2020-05-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Seung Koo PARK ,  Bong Je PARK ,  Mee Jeong CHOI ,  Suntak PARK ,  Eun Jin SHIN ,  Sungryul YUN ,  Jae Woong YOON

IPC: C08J5/18

Abstract: An embodiment of the inventive concept provides a method of manufacturing a polymer film, the method including: preparing a first copolymer containing a first functional group; preparing a second copolymer containing a second functional group; preparing a first compound containing a third functional group; and performing a cross-linking reaction by mixing the first copolymer, the second copolymer, and the first compound, wherein the cross-linking reaction includes a reaction of the first functional group and the second functional group and a reaction of the second functional group and the third functional group, the first compound includes a polar group and any one group selected from among a vinyl group, an aryl group, and an acrylate group, and the third functional group has reactivity with respect to the second functional group, but does not have reactivity with respect to the first functional group.

公开(公告)号：US20200209613A1

公开(公告)日：2020-07-02

申请号：US16721709

申请日：2019-12-19

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Suntak PARK ,  Bong Je PARK ,  Seung Koo PARK ,  Jae Woong YOON ,  Eun Jin SHIN

IPC: G02B26/08 ,  G02B7/04 ,  G02B26/00

Abstract: Provided is focal variable device system including a focus variable element including an absorbing layer, and an adjustable light source configured to cause an adjustable light to enter the focus variable element. The absorbing layer includes a thermal expansion material that absorbs the adjustable light and thermally expands.