US 11,747,697 B2
Electrochromic device
Seung Bae Oh, Gyeonggi-do (KR); Seong Hwan Lee, Gyeonggi-do (KR); Yong Sang La, Gyeonggi-do (KR); and Hyung Mo Kim, Gyeonggi-do (KR)
Assigned to SKC CO., LTD., Gyeonggi-do (KR)
Filed by SKC CO., LTD., Gyeonggi-do (KR)
Filed on Jun. 9, 2021, as Appl. No. 17/342,623.
Claims priority of application No. 10-2020-0070598 (KR), filed on Jun. 10, 2020.
Prior Publication US 2021/0389639 A1, Dec. 16, 2021
Int. Cl. G02F 1/157 (2006.01); G02F 1/01 (2006.01); G02F 1/15 (2019.01); G09G 3/19 (2006.01); G02F 1/163 (2006.01); G02F 1/155 (2006.01); E06B 9/24 (2006.01); G02F 1/153 (2006.01)
CPC G02F 1/163 (2013.01) [E06B 9/24 (2013.01); G02F 1/155 (2013.01); G02F 1/1533 (2013.01); E06B 2009/2464 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electrochromic device, which comprises:
a light transmission variable structure interposed between a first base layer and a second base layer,
wherein the light transmission variable structure comprises a first chromic layer and a second chromic layer,
the first chromic layer comprises a reducing chromic material,
the second chromic layer comprises an oxidizing chromic material, and
the value of c as defined in the following Equation 1 is 1.0 to 1.6:
c=T2/T1×b/a  [Equation 1]
in Equation 1, T1 (coloring time) is the time (s) for which the transmittance of visible light changes from 65% to 15% when an electric power of 3V is applied to the electrochromic device, T2 (decoloring time) is the time (s) for which the transmittance of visible light changes from 15% to 65% when the current direction is reversed after the coloring time is measured, a is the thickness (nm) of the first chromic layer, and b is the thickness (nm) of the second chromic layer,
wherein the b/a value is 1.5 to 2.2,
wherein the electrochromic device further comprises a first barrier layer interposed between the first base layer and the light transmission variable structure; and a second barrier layer interposed between the second base layer and the light transmission variable structure, and
wherein the first barrier layer and the second barrier layer each comprise two or more layers.