US 12,345,906 B2
Light modulation device
Min Jun Gim, Daejeon (KR); Sergey Belyaev, Daejeon (KR); Jung Sun You, Daejeon (KR); Cheol Ock Song, Daejeon (KR); Dong Hyun Oh, Daejeon (KR); Cheol Min Yun, Daejeon (KR); Jin Hong Kim, Daejeon (KR); and Jung Woon Kim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/636,557
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Oct. 22, 2020, PCT No. PCT/KR2020/014538
§ 371(c)(1), (2) Date Feb. 18, 2022,
PCT Pub. No. WO2021/080361, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 10-2019-0133731 (KR), filed on Oct. 25, 2019.
Prior Publication US 2022/0299690 A1, Sep. 22, 2022
Int. Cl. G02B 5/30 (2006.01)
CPC G02B 5/3016 (2013.01) [G02B 5/305 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A light modulation device, comprising:
a first polymer film substrate having a first surface and a second surface,
an adhesive layer or pressure-sensitive adhesive layer disposed on the first surface of the first polymer film substrate;
a second polymer film substrate having a first surface and a second surface;
a liquid crystal alignment film disposed on the first surface of the second polymer film substrate;
a −C plate; and
a light modulation layer containing a liquid crystal compound,
wherein the first and second polymer film substrates are disposed so that the first surfaces face each other, the first and second polymer film substrates each have a planar phase difference of 500 nm or more at a wavelength of 550 nm, the light modulation layer is present between the first and second polymer film substrates, and the −C plate is present between the light modulation layer and the first polymer film substrate or between the light modulation layer and the second polymer film substrate.