# US 11,307,340 B2 · Polarizing plate with adhesive layer having specified haze and liquid crystal display device comprising same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,340 B2 - Document ID: US11307340B2 - Status: Granted - Kind: B2 - Application number: 16/344,780 - Filed: 2017-09-27 - Published: 2019-08-08 - Granted: 2022-04-19 - Earliest claimed: 2016-10-31 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Dong Ho Wee; Young Min Kim; Young Oh; Yong Un Jung; Young Hyun Ju - Web page: https://patentgrep.com/patent/US11307340B2 ## CPC - G02B 5/305: {including organic materials, e.g. polymeric layers} - G02B 1/11: Anti-reflection coatings - G02B 1/14: Protective coatings, e.g. hard coatings - G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00) - G02F 1/133502: {Antiglare, refractive index matching layers} - G02F 1/133504: {Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606)} - G02F 1/133528: {Polarisers} - G02F 1/133507: {Films for enhancing the luminance} - G02F 1/133562: {on the viewer side} - G02F 2202/28: Adhesive materials or arrangements - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 ## Abstract Provided are a polarizing plate and a liquid crystal display device comprising the same, wherein the polarizing plate comprises a polarizer, a contrast ratio improvement film, an adhesive layer, and an antireflection film, which are sequentially laminated therein, the contrast ratio improvement film comprises a first protective layer, and a first resin layer and a second resin layer which are opposite to each other, the first resin layer includes an optical pattern including a pattern portion having a flat portion on one surface opposite to the second resin layer, and the adhesive layer has a haze of about 5% to about 40%. ## Claims ### Claim 1 A polarizing plate, comprising: a polarizer; a contrast ratio improvement film; an adhesive layer; and an anti-reflection film sequentially stacked in the stated order, wherein the contrast ratio improvement film comprises: a first protective layer; a first resin layer; and a second resin layer facing the first resin layer, the first resin layer comprises a patterned portion on one surface thereof facing the second resin layer, the patterned portion comprising optical patterns and a flat section formed between the optical patterns, the contrast ratio improvement film is located on a light exiting surface of the polarizer and is between the light exiting surface of the polarizer and the adhesive layer, and the adhesive layer has a haze of about 5% to about 40%. ### Claim 2 (depends on 1) The polarizing plate according to claim 1, wherein the adhesive layer comprises light scattering agents. ### Claim 3 (depends on 2) The polarizing plate according to claim 2, wherein the light scattering agents comprise at least one of (meth)acrylic based light scattering agents, urethane based light scattering agents, epoxy based light scattering agents, vinyl based light scattering agents, polyester based light scattering agents, polyamide based light scattering agents, polystyrene based light scattering agents, silicone based light scattering agents, titanium oxide, and zirconium oxide. ### Claim 4 (depends on 2) The polarizing plate according to claim 2, wherein the light scattering agents are present in an amount of about 0.1 wt % to about 25 wt % in the adhesive layer. ### Claim 5 (depends on 1) The polarizing plate according to claim 1, wherein the anti-reflection film has a minimum reflectance of about 0.5% or less. ### Claim 6 (depends on 1) The polarizing plate according to claim 1, wherein the anti-reflection film comprises a three-layer film in which a base layer, a high refractive hard coating layer, and a low refractive layer are sequentially stacked, as viewed from the adhesive layer. ### Claim 7 (depends on 6) The polarizing plate according to claim 6, wherein the high refractive hard coating layer has an index of refraction of about 1.50 to about 1.70. ### Claim 8 (depends on 6) The polarizing plate according to claim 6, wherein the low refractive layer has an index of refraction of about 1.25 to about 1.40. ### Claim 9 (depends on 1) The polarizing plate according to claim 1, wherein the adhesive layer has an index of refraction of about 1.40 to about 1.65. ### Claim 10 (depends on 1) The polarizing plate according to claim 1, wherein at least one optical pattern of the optical patterns has a base angle of 75° to about 90°, and the patterned portion satisfies Equation 1: 1

where, in Equation 1, P is a pitch of the patterned portion (unit: μm) and W is a maximum width of the at least one optical pattern (unit: μm). ### Claim 11 (depends on 1) The polarizing plate according to claim 1, wherein at least one optical pattern of the optical patterns is composed of a first surface at a top portion thereof and at least one inclined plane connected to the first surface, the inclined plane being a flat or curved surface. ### Claim 12 (depends on 1) The polarizing plate according to claim 1, wherein at least one optical pattern of the optical patterns has an aspect ratio of about 0.3 to about 3.0. ### Claim 13 (depends on 1) The polarizing plate according to claim 1, wherein the first resin layer has a higher index of refraction than the second resin layer. ### Claim 14 (depends on 1) The polarizing plate according to claim 1, wherein an absolute value of a difference between indices of refraction of the first resin layer and the second resin layer ranges from about 0.05 to about 0.20. ### Claim 15 (depends on 1) The polarizing plate according to claim 1, wherein, in the contrast ratio improvement film, the second resin layer directly adjoins the first resin layer and the first resin layer directly adjoins the first protective layer. ### Claim 16 (depends on 1) The polarizing plate according to claim 1, wherein the first resin layer or the second resin layer is an adhesive layer and the contrast ratio improvement film is directly formed on the polarizer. ### Claim 17 (depends on 1) The polarizing plate according to claim 1, wherein the first protective layer has an in-plane retardation Re of about 8,000 nm or more, as measured at a wavelength of 550 nm and represented by Equation A: Re=(nx−ny)×d where, in Equation A, nx and ny are indices of refraction in slow axis and fast axis directions of the first protective layer at a wavelength of 550 nm, respectively, and d is a thickness of the first protective layer (unit: nm). ### Claim 18 (depends on 1) The polarizing plate according to claim 1, wherein the first protective layer is formed of a polyester resin. ### Claim 19 (depends on 1) The polarizing plate according to claim 1, further comprising: a second protective layer between the polarizer and the contrast ratio improvement film. ### Claim 20 (depends on 19) The polarizing plate according to claim 19, wherein the second protective layer has an in-plane retardation Re of about 8,000 nm or more, as measured at a wavelength of 550 nm and represented by Equation A: Re=(nx−ny)×d where, in Equation A, nx and ny are indices of refraction in slow axis and fast axis directions of the second protective layer at a wavelength of 550 nm, respectively, and d is a thickness of the second protective layer (unit: nm). ### Claim 21 (depends on 1) A liquid crystal display comprising the polarizing plate according to claim 1.