Unlock instant, AI-driven research and patent intelligence for your innovation.

Polarizing plate and optical display apparatus comprising the same

A polarizing plate and polarizer technology, applied in the field of optical display equipment, can solve problems such as limitations and achieve the effect of thickness reduction

Pending Publication Date: 2022-02-15
SAMSUNG SDI CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a polarizing plate including a single 1 / 4 retardation layer or a laminate of a 1 / 2 retardation layer and a 1 / 4 retardation layer achieves an ellipticity of about 65% or more at an incident angle of about 60° with restrictions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarizing plate and optical display apparatus comprising the same
  • Polarizing plate and optical display apparatus comprising the same
  • Polarizing plate and optical display apparatus comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] A polyvinyl alcohol film (PS#_60, pre-stretched thickness: 60 μm, Kuraray Co., Ltd.) was stretched to 6 times its original length in an iodine aqueous solution at 55°C, thereby preparing a film with a transmittance of 45%. polarizer.

[0193] By depositing the composition of the second retardation layer [an amorphous composition comprising a cellulose ester polymer (containing trifluoroacetyl groups) containing 5 wt% of fluorine therein] on a cyclic polyolefin (COP) film (ZD film, Zeon Co., Ltd.) on the lower surface to form the coating of the second retardation layer. Cellulose ester polymers are prepared by adding trifluoroacetic acid and trifluoroacetic anhydride to unsubstituted cellulose, followed by reaction and polymerization.

[0194] After the coating was dried, the laminate of the coating and the COP film was stretched to 1.7 times its original length at 110°C and obliquely at 45° relative to the MD of the COP film, thereby preparing A laminate of the first ...

Embodiment 2 to 5

[0197] Polarizing plates were fabricated in the same manner as in Example 1, except that, as listed in Table 1, the retardation of each of the first and second retardation layers was changed by changing the elongation and stretching temperature.

Embodiment 6 to 9

[0199] A polarizing plate was manufactured in the same manner as in Example 1, except that a positive C-plate retardation layer (a third retardation layer formed of a cellulose ester composition) having Rth (@550 nm) as listed in Table 1 was added to stacked between the polarizer and the first retardation layer, and as listed in Table 1, the characteristics of each of the first retardation layer and the second retardation layer were maintained or changed.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
wavelengthaaaaaaaaaa
refractive indexaaaaaaaaaa
Login to View More

Abstract

A polarizing plate and an optical display apparatus including the same are provided. The polarizing plate includes a polarizer; and a first retardation layer and a second retardation layer sequentially stacked on a lower surface of the polarizer, and the first retardation layer has an in-plane retardation of about 180 nm to about 220 nm at a wavelength of about 550 nm; and the second retardation layer has an in-plane retardation of about 80 nm to about 100 nm at a wavelength of about 550 nm.

Description

[0001] Citations to related applications [0002] The present application claims the benefit of Korean Patent Application No. 10-2020-0091948 filed with the Korean Intellectual Property Office on July 23, 2020, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a polarizing plate and an optical display device comprising the polarizing plate. More specifically, the present invention relates to a polarizing plate having low reflectance both on the front and side of a screen and having an ellipticity of about 65% or more at an incident angle of about 60° and allowing its thickness to be reduced, and a polarizing plate comprising the polarizing plate Board optical display device. Background technique [0004] Visibility and contrast of OLED displays may be impaired due to reflection of external light. In order to solve this problem, a polarizing plate including a polarizer and a retardation film is used...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14
CPCG02B5/3083G02B5/305G02B1/14G02B1/11G02B1/04G02F1/13363H10K59/50C09K2323/00C09K2323/03C09K2323/031
Inventor 金奉春具埈谟申东允柳政勋李相钦
Owner SAMSUNG SDI CO LTD