US 11,809,044 B2
Liquid crystal phase difference film, polarizing plate for light-emitting display device including same, and light-emitting display device including same
Jin Hee Choi, Suwon-si (KR); Jin Sook Kim, Suwon-si (KR); Jung Hun You, Suwon-si (KR); Sun Hong Park, Suwon-si (KR); and Sang Hum Lee, Suwon-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Appl. No. 16/756,438
Filed by SAMSUNG SDI CO., LTD., Yongin-si (KR)
PCT Filed Sep. 11, 2018, PCT No. PCT/KR2018/010579
§ 371(c)(1), (2) Date Apr. 15, 2020,
PCT Pub. No. WO2019/083160, PCT Pub. Date May 2, 2019.
Claims priority of application No. 10-2017-0137783 (KR), filed on Oct. 23, 2017.
Prior Publication US 2020/0285093 A1, Sep. 10, 2020
Int. Cl. G02F 1/13363 (2006.01); G02F 1/1337 (2006.01); G02F 1/1335 (2006.01)
CPC G02F 1/13363 (2013.01) [G02F 1/1337 (2013.01); G02F 1/133528 (2013.01); B32B 2457/20 (2013.01); B32B 2457/202 (2013.01); C09K 2323/03 (2020.08); C09K 2323/031 (2020.08); C09K 2323/035 (2020.08); G02F 1/133742 (2021.01); G02F 2201/086 (2013.01); G02F 2202/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A liquid crystal retardation film comprising:
a first retardation layer having no alignment layer, a UV absorbent primer layer, and a second retardation layer sequentially stacked in the stated order,
wherein each of the first retardation layer and the second retardation layer is a liquid crystal layer,
wherein the liquid crystal retardation film has a retardation variation rate of about 3% or less, as calculated by Equation 1:
Retardation variation rate=|B−A|/A×100,
where A is an initial Re (unit: nm) of the liquid crystal retardation film at a wavelength of 550 nm; and
B is an Re (unit: nm) of the liquid crystal retardation film at a wavelength of 550 nm after the second retardation layer of the liquid crystal retardation film is irradiated with UV light at a wavelength of 300 nm to 400 nm for 250 hours,
wherein the first retardation layer comprises a crosslinked product of liquid crystals having photosensitive groups and only photosensitive groups irradiated with a linearly polarized light are crosslinked.