US 11,774,656 B2
Polarizer, method for manufacturing same, and display device
Puyu Qi, Beijing (CN); and Bing Zhang, Beijing (CN)
Assigned to CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., Sichuan (CN); and BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Filed by Chengdu BOE Optoelectronics Technology Co., Ltd., Sichuan (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Filed on Aug. 14, 2020, as Appl. No. 16/993,453.
Claims priority of application No. 201911046998.8 (CN), filed on Oct. 30, 2019.
Prior Publication US 2021/0132277 A1, May 6, 2021
Int. Cl. G02B 5/30 (2006.01); G02B 5/22 (2006.01); H10K 50/80 (2023.01); H10K 50/86 (2023.01)
CPC G02B 5/3083 (2013.01) [G02B 5/223 (2013.01); G02B 5/3016 (2013.01); H10K 50/868 (2023.02); C09K 2323/00 (2020.08); C09K 2323/03 (2020.08); C09K 2323/031 (2020.08); H10K 50/86 (2023.02)] 10 Claims
OG exemplary drawing
 
1. A polarizer, comprising: an optical retardation layer and a linear polarization layer which are laminated; wherein
the optical retardation layer comprises a first retardation region, a second retardation region, and a third retardation region for performing phase retardation on incident light, a phase retardation value of the first retardation region comprising a quarter of a wavelength of blue light, a phase retardation value of the second retardation region comprising a quarter of a wavelength of green light, and a phase retardation value of the third retardation region comprising a quarter of a wavelength of red light; wherein an area of the first retardation region is equal to an area of the third retardation region, and an area of the second retardation region is greater than the area of the first retardation region;
the optical retardation layer comprises a retardation alignment sub-layer and a liquid crystal sub-layer, the retardation alignment sub-layer being configured to align the liquid crystal sub-layer; and
a thickness of the first retardation region, a thickness of the second retardation region, and a thickness of the third retardation region are all equal, and in the liquid crystal sub-layer, a liquid crystal of the first retardation region, a liquid crystal of the second retardation region, and a liquid crystal of the third retardation region are different from one another, such that a refractive index difference of the first retardation region, a refractive index difference of the second retardation region, and a refractive index difference of the third retardation region are not equal from one another; or
a thickness of the first retardation region, a thickness of the second retardation region, and a thickness of the third retardation region are not equal from one another, and in the liquid crystal sub-layer, a liquid crystal of the first retardation region, a liquid crystal of the second retardation region, and a liquid crystal of the third retardation region are the same, such that a refractive index difference of the first retardation region, a refractive index difference of the second retardation region, and a refractive index difference of the third retardation region are all equal;
wherein the refractive index difference of any retardation region is a difference between a refractive index of the retardation region for ordinary light and a refractive index of the retardation region for extraordinary light.