# US 12,601,866 B2 · Polarizing plate and optical display device comprising same

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- Number: US 12,601,866 B2
- Document ID: US12601866B2
- Status: Granted
- Kind: B2
- Application number: 17/904,776
- Filed: 2021-02-10
- Published: 2022-12-29
- Granted: 2026-04-14
- Earliest claimed: 2020-03-09
- Assignees: Wuxi Hengxin Optoelectronic Materials Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Jun Mo Koo; Jung Hun You; Sang Hum Lee; Bong Choon Kim; Dong Yoon Shin
- Web page: https://patentgrep.com/patent/US12601866B2

## CPC

- G02B 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)}
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Provided are: a polarizing plate comprising a polarizer, and a protective layer formed on at least one surface of the polarizer, and an optical display device comprising same. The polarizing plate comprises a first area and second area which are in an image display area, wherein the first area and second area have mutually different light transmittances at the same wavelength, the first area has a light transmittance of approximately 50% to 80%, and the first area has a color value a* of approximately −13 to 2, and a color value b* of approximately 1 to 35.

## Claims

### Claim 1

A polarizing plate comprising: a polarizer; and a protective layer formed on at least one surface of the polarizer,
the polarizing plate comprising a first region and a second region within an image display region,
wherein the first region and the second region have different light transmittances at the same wavelength,
wherein the first region has a light transmittance of about 50% to about 80%, a color value a* of about −13 to about 2, and a color value b* of about 1 to about 35, wherein the combination of the light transmittance and the color values allows an image to be consecutively displayed together with the second region while allowing an image to be more clearly photographed when using an image sensor; and
wherein the first region has a degree of polarization of 25% to about 80%, and wherein the degree of polarization in combination with the light transmittance and the color values enables the first region to perform both an image display function and an image photographing function.

### Claim 2 (depends on 1)

The polarizing plate according to claim 1, wherein the first region has an iodine content of about 0.01 wt % to about 5 wt %.

### Claim 3 (depends on 2)

An optical display device comprising the polarizing plate according to claim 2.

### Claim 4 (depends on 1)

The polarizing plate according to claim 1, wherein the first region has an image display function and an image photographing function, and wherein the combination of the light transmittance and the color values enables suppression of visual observation of an image sensor disposed under the first region when the image sensor is not in use, while enabling clear photographing when the image sensor is in use.

### Claim 5 (depends on 4)

An optical display device comprising the polarizing plate according to claim 4.

### Claim 6 (depends on 1)

The polarizing plate according to claim 1, wherein the second region has a light transmittance of about 40% to less than about 50%.

### Claim 7 (depends on 5)

An optical display device comprising the polarizing plate according to claim 5.

### Claim 8 (depends on 1)

An optical display device comprising the polarizing plate according to claim 1.

### Claim 9 (depends on 1)

The polarizing plate according to claim 1, wherein the first region has a color value b* of about 5 to about 35, wherein the refined range of the color value b* in combination with the light transmittance and the color value a* further enhances consecutive image display together with the second region while maintaining clear image photographing capability.

### Claim 10 (depends on 9)

An optical display device comprising the polarizing plate according to claim 9.

### Claim 11 (depends on 9)

The polarizing plate according to claim 9, wherein the first region has a color value b* of 15 to about 35.

### Claim 12 (depends on 11)

An optical display device comprising the polarizing plate according to claim 11.