# US 11,994,652 B2 · Polarizing plate and optical display including the same

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- Number: US 11,994,652 B2
- Document ID: US11994652B2
- Status: Granted
- Kind: B2
- Application number: 16/205,144
- Filed: 2018-11-29
- Published: 2019-07-04
- Granted: 2024-05-28
- Earliest claimed: 2017-12-28
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Ji Hyun Hwang; Yoo Jin Kim; Jin Woo Kim; Dong Yoon Shin; Bae Wook Lee; Sung Man Cho
- Web page: https://patentgrep.com/patent/US11994652B2

## CPC

- G02B 1/14: Protective coatings, e.g. hard coatings
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/36: comprising polyesters
- C08K 5/3492: Triazines
- C09D 5/32: Radiation-absorbing paints {(protection against X-, gamma- or corpuscular radiation G21F)}
- C09D 7/48: Stabilisers against degradation by oxygen, light or heat
- C09D 7/61: inorganic
- C09J 7/22: Plastics; Metallised plastics
- C09J 9/00: Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence)
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- G02B 5/003: {Light absorbing elements}
- G02B 5/305: {including organic materials, e.g. polymeric layers}
- G02F 1/00: Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- C08K 3/04: Carbon
- C08K 3/08: Metals
- C08K 3/11: Compounds containing metals of Groups 4 to 10 or of Groups 14 to 16 of the Periodic Table
- C08K 5/005: {Stabilisers against oxidation, heat, light, ozone}
- C08K 5/0091: {Complexes with metal-heteroatom-bonds}
- C08K 5/07: Aldehydes; Ketones
- C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K 5/132: Phenols containing keto groups {, e.g. benzophenones}
- C08K 5/1345: {Carboxylic esters of phenolcarboxylic acids}
- C08K 5/20: Carboxylic acid amides
- C08K 5/23: Azo-compounds
- C08K 5/315: Compounds containing carbon-to-nitrogen triple bonds
- C08K 5/3417: condensed with carbocyclic rings
- C08K 5/3435: Piperidines
- C08K 5/3437: condensed with carbocyclic rings
- C08K 5/3475: condensed with carbocyclic rings
- C09J 2301/416: use of irradiation
- C09K 2323/035: Ester polymer, e.g. polycarbonate, polyacrylate or polyester
- 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: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A polarizing plate and an optical display including the same are provided. The polarizing plate is composed of a display region and a non-display region surrounding the display region, and includes: a polarizer; and a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer. A light shielding layer includes a UV absorbent material and is embedded in the bonding layer to constitute at least a portion of the non-display region. The light shielding layer is formed on at least one surface of the first polarizer protective film.

## Claims

### Claim 1

A polarizing plate composed of a display region and a non-display region surrounding the display region, the polarizing plate comprising:
a polarizer;
a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer; and
a light shielding layer comprising an ultraviolet (UV) absorbent,
wherein the light shielding layer is embedded in the bonding layer to constitute at least a portion of the non-display region, and the light shielding layer is on at least one surface of the first polarizer protective film,
wherein the UV absorbent is present in an amount of about 0.05 wt % to about 5 wt % in the light shielding layer,
wherein the bonding layer comprises a UV curable bonding agent,
wherein the light shielding layer is formed from a heat-curable composition for light shielding layer, and
wherein the light shielding layer comprises:
a continuous non-printed region in the non-display region, and
a printed region comprising a plurality of printed patterns separated from each other by the continuous non-printed region, the printed patterns comprising:
a first printed layer and a second printed layer directly formed on the first printed layer, the second printed layer having a shape different from the first printed layer.

### Claim 2 (depends on 1)

The polarizing plate according to claim 1, wherein the UV absorbent is further present on at least one surface of the light shielding layer.

### Claim 3 (depends on 1)

The polarizing plate according to claim 1, wherein the UV absorbent has a maximum absorption wavelength of about 380 nm to about 420 nm.

### Claim 4 (depends on 1)

The polarizing plate according to claim 1, wherein the UV absorbent comprises at least one selected from benzophenone, triazine, benzotriazole, oxanilide, phenyl salicylate, salicylate, cyanoacrylate, cinnamate, indole, azo, and naphthalene diimide-based UV absorbents.

### Claim 5 (depends on 1)

The polarizing plate according to claim 1, wherein the UV absorbent comprises at least one selected from a benzophenone-based UV absorbent and a triazine-based UV absorbent.

### Claim 6 (depends on 5)

The polarizing plate according to claim 5, wherein the benzophenone-based UV absorbent comprises a compound represented by Formula 1:
wherein R1 is a C1 to C4 alkyl group; R2 and R3 are each independently a hydroxyl group, a C1 to C8 alkoxy group, or a halogen; n and m are each independently an integer of 0 to 5; and n+m is an integer of 5 or less.

### Claim 7 (depends on 5)

The polarizing plate according to claim 5, wherein the triazine-based UV absorbent comprises a hydroxy phenyl triazine UV absorbent.

### Claim 8 (depends on 1)

The polarizing plate according to claim 1, wherein the light shielding layer further comprises a UV stabilizer.

### Claim 9 (depends on 8)

The polarizing plate according to claim 8, wherein the UV stabilizer is present in an amount of about 0.05 wt % to about 3 wt % in the light shielding layer.

### Claim 10 (depends on 8)

The polarizing plate according to claim 8, wherein the UV stabilizer further comprises at least one selected from a hindered amine-based UV stabilizer and a metal complex salt-based UV stabilizer.

### Claim 11 (depends on 1)

The polarizing plate according to claim 1, wherein the heat-curable composition for light shielding layer comprises a pigment, a binder resin, a heat-curing initiator, and the UV absorbent.

### Claim 12 (depends on 11)

The polarizing plate according to claim 11, wherein the pigment comprises at least one selected from carbon black and a silver-tin alloy.

### Claim 13 (depends on 11)

The polarizing plate according to claim 11, wherein the binder resin comprises at least one selected from an acrylic resin, a polyimide resin, and a polyurethane resin.

### Claim 14 (depends on 1)

The polarizing plate according to claim 1, wherein the heat-curable composition for light shielding layer further comprises a thermosetting unsaturated compound.

### Claim 15 (depends on 1)

The polarizing plate according to claim 1, wherein the heat-curable composition for light shielding layer comprises the UV absorbent.

### Claim 16 (depends on 1)

The polarizing plate according to claim 1, wherein the light shielding layer has a thickness of about 5 μm or less.

### Claim 17 (depends on 1)

The polarizing plate according to claim 1, further comprising a second polarizer protective film on a lower surface of the polarizer.

### Claim 18 (depends on 1)

The polarizing plate according to claim 1, wherein the polarizing plate has an a* variation rate of about 50% or less, as calculated by Equation 1:
a*variation rate=|(a*)500 h−(a*)0 h|/|(a*)0 h|×100, Equation 1
wherein (a*)0 h is an a* value measured on the light shielding layer of the polarizing plate prior to irradiation, and (a*)500 h is an a* value measured on the light shielding layer of the polarizing plate after irradiation of the polarizing plate with sunlight for 500 hours.

### Claim 19 (depends on 1)

The polarizing plate according to claim 1, wherein the polarizing plate has a b* variation rate of about 200% or less, as calculated by Equation 2:
b*variation rate=|(b*)500 h−(b*)0 h|/|(b*)0 h|×100, Equation 2
wherein (b*)0 h is a b* value measured on the light shielding layer of the polarizing plate prior to irradiation and (b*)500 h is a b* value measured on the light shielding layer of the polarizing plate after irradiation of the polarizing plate with sunlight for 500 hours.

### Claim 20 (depends on 1)

The polarizing plate according to claim 1, wherein the polarizing plate has an optical density (OD) variation rate of about 20% or less, as calculated by Equation 3:
OD variation rate=|(OD)500 h−(OD)0 h|/(OD)0 h×100, Equation 3
wherein (OD)0 h is an OD value measured on the light shielding layer of the polarizing plate prior to irradiation, and (OD)500 h is an OD value measured on the light shielding layer of the polarizing plate after irradiation of the polarizing plate with sunlight for 500 hours.

### Claim 21 (depends on 1)

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

### Claim 22

A polarizing plate composed of a display region and a non-display region surrounding the display region, the polarizing plate comprising:
a polarizer;
a bonding layer and a first polarizer protective film sequentially stacked on an upper surface of the polarizer; and
a light shielding layer comprising an ultraviolet (UV) absorbent,
wherein the light shielding layer is embedded in the bonding layer to constitute at least a portion of the non-display region, and the light shielding layer is on at least one surface of the first polarizer protective film,
wherein a total thickness of the light shielding layer and the bonding layer in the non-display region is the same as a thickness of the bonding layer in the display region, and the light shielding layer is between the bonding layer and the first polarizer protective film in the non-display region,
wherein the UV absorbent is present in an amount of about 0.05 wt % to about 5 wt % in the light shielding layer,
wherein the bonding layer comprises a UV curable bonding agent,
wherein the light shielding layer is formed from a heat-curable composition for light shielding layer, and
wherein the light shielding layer comprises:
a continuous non-printed region in the non-display region, and
a printed region comprising a plurality of printed patterns separated from each other by the continuous non-printed region, the printed patterns comprising:
a first printed layer and a second printed layer directly formed on the first printed layer, the second printed layer having a shape different from the first printed layer.