US 11,985,847 B2
Circularly polarizing plate
Yeon Keun Lee, Daejeon (KR); Hyun Hee Son, Daejeon (KR); Mun Kyu Joo, Daejeon (KR); Deok Hwan Kim, Daejeon (KR); and Dong Choon Kim, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/273,404
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Nov. 4, 2019, PCT No. PCT/KR2019/014806
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/091552, PCT Pub. Date May 7, 2020.
Claims priority of application No. 10-2018-0133585 (KR), filed on Nov. 2, 2018.
Prior Publication US 2021/0336230 A1, Oct. 28, 2021
Int. Cl. G02B 1/11 (2015.01); G02B 5/30 (2006.01); H10K 50/86 (2023.01)
CPC H10K 50/86 (2023.02) [G02B 1/11 (2013.01); G02B 5/3016 (2013.01); G02B 5/3025 (2013.01); G02B 5/3083 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A circularly polarizing plate comprising sequentially:
an antireflection film;
a polarizer;
a retardation film having an R(450)/R(550) value of 0.99 to 1.01 where R (λ) is an in-plane retardation value for a wavelength of λ nm; and
a pressure-sensitive adhesive layer,
wherein the antireflection film has a lowest reflection wavelength of 470 nm or less, the retardation film has an in-plane retardation value of 136.0 nm or more for a wavelength of 550 nm, and the circularly polarizing plate has a transmittance of 30% or less for a wavelength of 430 nm,
wherein in the antireflection film, reflection colors satisfy a L*a*b* color coordinate criteria of a*>0, b*>0 and a*<b*.