US 12,282,221 B2
Optical laminate, method for manufacturing same, smart window comprising same, and vehicle and building window or door employing same
Sung-Su Kim, Pyeongtaek-si (KR); Sung-Ho Baek, Pyeongtaek-si (KR); Hong-Jun Ahn, Seoul (KR); and Pyoung-Yun Oh, Pyeongtaek-si (KR)
Assigned to DONGWOO FINE-CHEM CO., LTD., Iksan-si (KR)
Appl. No. 18/291,431
Filed by DONGWOO FINE-CHEM CO., LTD., Iksan-si (KR)
PCT Filed Sep. 20, 2022, PCT No. PCT/KR2022/014011
§ 371(c)(1), (2) Date Jan. 23, 2024,
PCT Pub. No. WO2023/054962, PCT Pub. Date Apr. 6, 2023.
Claims priority of application No. 10-2021-0127732 (KR), filed on Sep. 28, 2021; and application No. 10-2022-0063405 (KR), filed on May 24, 2022.
Prior Publication US 2024/0369873 A1, Nov. 7, 2024
Int. Cl. G02F 1/13363 (2006.01); G02F 1/1335 (2006.01); G02F 1/1339 (2006.01); G02F 1/1343 (2006.01); G02F 1/137 (2006.01)
CPC G02F 1/133531 (2021.01) [G02F 1/133631 (2021.01); G02F 1/133637 (2021.01); G02F 1/133638 (2021.01); G02F 1/13398 (2021.01); G02F 1/13439 (2013.01); G02F 1/137 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A variable transmittance optical stack comprising:
a first polarizing plate comprising a first polarizer and a polarizing rotation layer;
a first transparent conductive layer formed on one surface of the first polarizing plate;
a second polarizing plate comprising a second polarizer and a retardation layer, and opposing the first polarizing plate;
a second transparent conductive layer formed on one surface of the second polarizing plate, and opposing the first transparent conductive layer; and
a liquid crystal layer provided between the first transparent conductive layer and the second transparent conductive layer,
wherein at least one transparent conductive layer of the first transparent conductive layer and the second transparent conductive layer is formed by directly contacting with any one polarizing plate of the first polarizing plate and the second polarizing plate,
wherein the polarizing rotation layer has a reverse wavelength or flat wavelength dispersion characteristic,
wherein the retardation layer comprises a negative C plate,
wherein an absorbing axis of the first polarizer and an absorbing axis of the second polarizer are parallel to each other, and
wherein the liquid crystal layer is driven in a twisted nematic mode.