US 12,443,071 B2
Optical stack and manufacturing method therefor, and smart window comprising same and vehicle or building window to which same is applied
Dong-Hwi Kim, Sejong (KR); Seung-Won Song, Seoul (KR); Hong-Jun Ahn, Seoul (KR); Pyoung-Yun Oh, Pyeongtaek-si (KR); and Yu-Jin Lee, Goyang-si (KR)
Assigned to DONGWOO FINE-CHEM CO., LTD., Iksan-si (KR)
Appl. No. 18/566,596
Filed by DONGWOO FINE-CHEM CO., LTD., Iksan-si (KR)
PCT Filed May 27, 2022, PCT No. PCT/KR2022/007590
§ 371(c)(1), (2) Date Dec. 1, 2023,
PCT Pub. No. WO2022/255741, PCT Pub. Date Dec. 8, 2022.
Claims priority of application No. 10-2021-0072854 (KR), filed on Jun. 4, 2021.
Prior Publication US 2024/0280854 A1, Aug. 22, 2024
Int. Cl. G02F 1/1335 (2006.01); G02B 5/30 (2006.01); G02F 1/13363 (2006.01); G02F 1/1339 (2006.01)
CPC G02F 1/133528 (2013.01) [G02B 5/3016 (2013.01); G02B 5/305 (2013.01); G02B 5/3083 (2013.01); G02F 1/133502 (2013.01); G02F 1/13363 (2013.01); G02F 1/13396 (2021.01)] 16 Claims
OG exemplary drawing
 
1. A variable transmittance optical stack comprising:
polarizing plates stacked on both surfaces thereof with a liquid crystal layer driven in response to an electric field and located therebetween,
wherein each of the polarizing plates comprises a polarizer and a protective layer formed on at least one surface of the polarizer,
wherein a transparent conductive layer is formed by directly contacting with each of the polarizing plates,
wherein the transparent conductive layer is formed by directly contacting with each of the polarizing plates without a separate substrate between each of the polarizing plates and the transparent conductive layer,
wherein the variable transmittance optical stack further comprises a refractive index-matching layer between each of the polarizing plates and the transparent conductive layer,
wherein the refractive index-matching layer has a refractive index ranging from 1.4 to 2.6, and
wherein a total light transmittance of the optical stack changes in response to application of voltage.