US 11,809,056 B2
Apparatus having variable transmittance
Young Sik Yoon, Daejeon (KR); Tae Gyun Kwon, Daejeon (KR); and Moon Soo Park, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 16/761,139
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Nov. 2, 2018, PCT No. PCT/KR2018/013269
§ 371(c)(1), (2) Date May 1, 2020,
PCT Pub. No. WO2019/088768, PCT Pub. Date May 9, 2019.
Claims priority of application No. 10-2017-0145698 (KR), filed on Nov. 3, 2017.
Prior Publication US 2021/0116773 A1, Apr. 22, 2021
Int. Cl. G02F 1/1676 (2019.01); G02F 1/167 (2019.01); E06B 9/68 (2006.01)
CPC G02F 1/1676 (2019.01) [G02F 1/167 (2013.01); E06B 9/68 (2013.01); E06B 2009/6827 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transmittance-variable device, comprising:
a transmittance-variable film capable of being switched between a transparent mode and a black mode by application of a voltage signal; and
a power source for applying a positive voltage signal and a negative voltage signal,
wherein the transparent mode is implemented by applying and maintaining the positive voltage signal, and
wherein the black mode is implemented by applying the negative voltage signal such that the intensity of the negative voltage signal decreases with time,
wherein the transmittance-variable film comprises:
a first electrode substrate, an electrophoretic layer, and a second electrode substrate sequentially arranged,
wherein the power source applies the negative voltage signal such that the intensity of the voltage signal decreases from −25 V to −5 V with time to implement the black mode.