# US 12,010,900 B2 · Circular polarizing plate

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- Number: US 12,010,900 B2
- Document ID: US12010900B2
- Status: Granted
- Kind: B2
- Application number: 17/273,024
- Filed: 2019-11-04
- Published: 2021-10-21
- Granted: 2024-06-11
- Earliest claimed: 2018-11-02
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Yeon Keun Lee; Hyun Hee Son; Mun Kyu Joo; Deok Hwan Kim; Dong Choon Kim
- Web page: https://patentgrep.com/patent/US12010900B2

## CPC

- G02B 1/113: using inorganic layer materials only
- G02B 1/11: Anti-reflection coatings
- G02B 5/223: {containing organic substances, e.g. dyes, inks or pigments}
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Provided is a circularly polarizing plate capable of improving a reflection color by using a retardation film with flat dispersion characteristics, and an OLED device comprising the circularly polarizing plate.

## Claims

### Claim 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 and having a slow axis to form 37 to 43 degrees with an absorption axis of the polarizer, wherein R (λ) is an in-plane retardation value for a wavelength of λ nm; and
a pressure-sensitive adhesive layer, wherein the circularly polarizing plate has a transmittance of 30% or less for a wavelength of 430 nm.

### Claim 2 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the antireflection film has a haze of 1% or less.

### Claim 3 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the antireflection film has a lowest reflection wavelength that is in a range of 400 nm to 530 nm.

### Claim 4 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the polarizer has a transmittance for a wavelength of 550 nm in a range of 40% to 50%.

### Claim 5 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the in-plane retardation value of the retardation film for a wavelength of 550 nm is 135 nm to 142 nm.

### Claim 6 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the retardation film is a liquid crystal polymerization film or a polymer stretched film.

### Claim 7 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the circularly polarizing plate has a transmittance of 40% or more for wavelengths of 460 nm and 550 nm, respectively.

### Claim 8 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the circularly polarizing plate has a transmittance of 4% or more for a wavelength of 430 nm.

### Claim 9 (depends on 1)

The circularly polarizing plate according to claim 1, wherein the circularly polarizing plate further comprises a dye exhibiting a maximum absorbance in a range of 370 nm to 430 nm.

### Claim 10 (depends on 1)

An OLED (organic light emitting diode) device comprising an OLED panel and the circularly polarizing plate of claim 1 disposed on one side of the OLED panel.

### Claim 11 (depends on 10)

The OLED device according to claim 10, wherein the OLED panel has an average reflectance of 45% or less for a wavelength in a range of 410 nm to 500 nm and an average reflectance of 50% or less for a wavelength in a range of 600 nm to 650 nm.

### Claim 12 (depends on 10)

The OLED device according to claim 10, wherein the OLED panel, to which the circularly polarizing plate is attached, has a reflectance of 1.7% or less for a wavelength of 550 nm.

### Claim 13 (depends on 10)

The OLED device according to claim 10, wherein reflection colors of the OLED panel, to which the circularly polarizing plate is attached, satisfy a L*a*b* color coordinate criteria of a*<8 and b*>−8.5.