KR20140115882A - Polarizing plate, module for liquid crystal display and liquid crystal display comprising the same - Google Patents

Polarizing plate, module for liquid crystal display and liquid crystal display comprising the same Download PDF

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Publication number
KR20140115882A
KR20140115882A KR1020130031163A KR20130031163A KR20140115882A KR 20140115882 A KR20140115882 A KR 20140115882A KR 1020130031163 A KR1020130031163 A KR 1020130031163A KR 20130031163 A KR20130031163 A KR 20130031163A KR 20140115882 A KR20140115882 A KR 20140115882A
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South Korea
Prior art keywords
polarizer
protective film
adhesive layer
liquid crystal
crystal display
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KR1020130031163A
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Korean (ko)
Inventor
송이화
정오용
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제일모직주식회사
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Priority to KR1020130031163A priority Critical patent/KR20140115882A/en
Publication of KR20140115882A publication Critical patent/KR20140115882A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention relates to a polarizing plate, a liquid crystal display device module, and a liquid crystal display device thereof. In the polarizing plate, a polarizer, an adhesive layer, and a protective film are sequentially laminated together. The polarizing plate also includes at least one of a polarization cancelling agent and a polarization cancelling layer including the polarization cancelling agent between the polarizer and the protection film.

Description

[0001] The present invention relates to a polarizing plate, a module for a liquid crystal display, and a liquid crystal display including the polarizing plate,

The present invention relates to a polarizing plate, a module for a liquid crystal display device, and a liquid crystal display device including the same.

The polarizing plate is used in and out of the liquid crystal cell for the purpose of controlling the direction of light oscillation in order to visualize the display pattern of the liquid crystal display device. Liquid crystal display devices have been used in a wide range from small-sized devices at the beginning of development to notebook computers, liquid crystal monitors, liquid crystal color projectors, liquid crystal televisions, navigation systems for vehicles, personal phones, and measurement devices used indoors and outdoors Respectively.

The polarizing plate may include a polarizer and a protective film laminated on both sides of the polarizer.

Triacetylcellulose (TAC) films are widely used as protective films. However, TAC film is more expensive than general polymer film. As a result, a low-priced polymer film has been used as a protective film, and a polarizer using a polyethylene terephthalate (PET) film as a protective film has been developed.

However, when the PET film is used in a liquid crystal display device, iridescence may occur and image quality may be deteriorated. In order to solve this problem, a PET film having an ultra-high retardation can be applied. However, the thickness of the PET film is proportional to the retardation value.

In recent years, efforts have been made to realize a thin liquid crystal display device, and it is necessary to develop a polarizing plate that improves visibility and does not cause irregularity even when a thin PET film having a low phase difference is included.

In this connection, Japanese Laid-Open Patent Publication No. 2012-088507 discloses a liquid crystal display device including a resin, a polarizing eliminating film containing organic-inorganic composite particles having an organic group on the surface of inorganic particles and dispersed as primary particles in the resin have.

An object of the present invention is to provide a polarizing plate capable of converting polarized light inside a liquid crystal display into non-polarized light, preventing rainbow stains from occurring, and improving visibility.

Another object of the present invention is to provide a module for a liquid crystal display device which can convert polarized light inside a liquid crystal display into non-polarized light, prevent iridescence from occurring, and improve visibility.

Another object of the present invention is to provide a liquid crystal display device including the module.

The polarizing plate, which is an aspect of the present invention, may include at least one of a polarizer, an adhesive layer, and a protective film sequentially stacked, and a polarizer and a depolarizing layer containing the polarizer and the protective film between the polarizer and the protective film.

A liquid crystal display module according to another aspect of the present invention includes: a liquid crystal display panel; An upper polarizer laminated on an upper surface of the liquid crystal display panel and including a first polarizer, a first adhesive layer formed on an upper surface of the first polarizer, and a first protective film formed on an upper surface of the first adhesive layer; And a fourth adhesive layer laminated between a lower surface of the liquid crystal display panel and the liquid crystal display panel and a light source, the fourth adhesive layer being formed on the lower surface of the second polarizer, the fourth adhesive layer formed on the lower surface of the fourth adhesive layer, Wherein at least one of the lower surface of the fourth protective film between the first protective film and the first polarizer, between the second polarizer and the fourth protective film, And a depolarization layer containing the same.

The liquid crystal display device according to another aspect of the present invention may include the liquid crystal display device module.

The present invention provides a module for a liquid crystal display device that converts polarized light inside a liquid crystal display device into non-polarized light and prevents rainbow spots from occurring and improves visibility.

1 is a cross-sectional view of a polarizing plate of one embodiment of the present invention.
2 is a cross-sectional view of a polarizing plate of another embodiment of the present invention.
3 is a cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.
4 is a cross-sectional view of a module for a liquid crystal display device according to another embodiment of the present invention.
5 is a cross-sectional view of a module for a liquid crystal display device according to another embodiment of the present invention.
6 is a cross-sectional view of a module for a liquid crystal display device according to another embodiment of the present invention.
7 is a cross-sectional view of a module for a liquid crystal display device according to another embodiment of the present invention.
8 is an enlarged cross-sectional view of a first adhesive layer including a depolarizing layer according to one embodiment of the present invention.
9 is a cross-sectional view of a liquid crystal display device according to one embodiment of the present invention.

In the present specification, 'upper' and 'lower' are defined with reference to drawings for convenience, and 'upper' may be changed to 'lower' and 'lower' may be changed to 'upper' depending on viewing time.

In the present specification, 'depolarization' may mean an effect of converting linear or circularly polarized light coming out of a liquid crystal display device into a form of non-polarized light (for example, natural light) while simultaneously reducing rainbow stains.

As used herein, the term "depolarizing agent" refers to a substance having the above-mentioned depolarizing effect and having a solid form such as a rod form, a spherical form, a fiber form, or a combination of a rod form and a spherical form ), ≪ / RTI > and the like.

The polarizing plate, which is an aspect of the present invention, may include at least one of a polarizer, an adhesive layer, and a protective film sequentially stacked, and a polarizer and a depolarizing layer containing the polarizer and the protective film between the polarizer and the protective film.

Preferably, the depolarizing agent and the depolarizing layer may be formed on at least one of the adhesive layer and one side of the protective film.

The polarizer or the depolarizing layer is included in a polarizing plate for a liquid crystal display including a thin or ultra-thin protective film, thereby suppressing the generation of iridescence generated in the liquid crystal display device, and at the same time, (Natural light), it is possible to improve the visibility from the outside. That is, the protective film, for example, the polyethylene terephthalate protective film, decreases in proportion to the thinner the thickness of the protective film, and the lower the phase difference, the higher the possibility of iridescence in the liquid crystal display device. The polarizer or the depolarizer layer makes the polarized light polarized by the polarizer depolarized by the polarizer, thereby increasing the viewing angle while suppressing the occurrence of rainbow blur and improving the visibility.

The depolarizer may include a conventional agent if it is a light-transmissive agent having birefringence and capable of scattering light.

The depolarizer may be in the form of particles or fibers, for example, in the form of a rod, a sphere, a fiber, or a combination of a rod and a sphere, such as a dumbbell.

The depolarizer may be in a porous or non-porous form. The "non-porous" may mean a form in which the percentage of voids in the particles is 0%.

The polarizer is not limited to organic or inorganic materials. Examples of the inorganic substance include silica (SiO 2 ), alumina (Al 2 O 3 ), alumina (Al 2 O 3 ), and the like. , Titania (TiO 2 ), zirconia (ZrO 2 ), zinc oxide (ZnO), and the like.

In an embodiment, the depolarizing agent may include at least one of cellulose particles in the form of a rod, porous particles of a polyamide, cellulose in a fiber form.

The porous "polyamide" used in the specific examples of the present invention may include a thermoplastic polyamide comprising ring-opening polymerization of cyclic amide, polycondensation of amino acid, polycondensation of dicarboxylic acid and diamine. The raw materials used for the ring-opening polymerization of the cyclic amide include? -Caprolactam,? -Caprolactam, and the raw materials used for the polycondensation of amino acids include? -Aminocaproic acid,? -Aminododecanoic acid,? -Amino Undecanoic acid, and the like, and raw materials used for polycondensation of dicarboxylic acid and diamine include dicarboxylic acids such as acetic acid, adipic acid, sebacic acid, and 1,4-cyclohexyldicarboxylic acid, and diamines such as ethylenediamine, hexamethylenediamine, , 4-cyclohexyldiamine, pentamethylenediamine, decamethylenediamine and the like. The polyamide may also be further polymerized with a small amount of aromatic components such as terephthalic acid, isophthalic acid, m-xylylenediamine, and the like.

The porous particles are particles having a melting point of 280 캜 or higher, preferably 280 캜 to 330 캜, and are superior in thermal stability to porous particles made of nylon 6, nylon 66, or nylon 12, and have a porous particle shape Lt; / RTI >

The porous particles may be at least 70 wt% and not more than 100 wt%, and preferably not less than 80 wt%, of the porous particles may be porous spherical particles.

The porous particles may have an average particle diameter of 0.1 to 30 탆, preferably 0.5 to 20 탆, more preferably 1 to 15 탆. In the above range, the operation is easy and the depolarization effect can be realized.

Furthermore, the porous particles may have a BET specific surface area is 1 ~ 300m 2 / g, preferably 5-200m 2 / g. The average particle diameter of the porous particles may be 0.01-0.5 mu m, preferably 0.02-0.3 mu m. The porous particles may have a spherical crystal structure of a single particle type in which a large number of polyamide (nylon) fibrils (nylon fibrils) are dispersed radially from the center (core). By having a spherical crystal structure, the degree of crystallization can be increased and the thermal stability can be improved.

The crystallinity of the porous particles may be 35% or more and 100% or less, preferably 45-100%.

The rod-shaped particles have a size in the longitudinal direction (lengthwise direction) of 0.1 to 500 μm, preferably 1 to 400 μm, more preferably 2 to 250 μm. The thickness in the single direction is 0.01 to 50 탆, preferably 0.1 to 20 탆. Within this range, there may be light scattering and depolarization functions, and the haze may not increase.

The refractive index of the depolarizer preferably ranges from 1.4 to 1.9. In the range of 1.45 to 1.65, the difference between the refractive index of the binder and the binder is preferably controlled to 0.01 to 0.5, and it is preferable since the polarizing function and high transparency are exhibited. Also, when a polarizer having a high refractive index of 1.65 to 1.9 is used, it can be used as a high refractive index layer of an antireflection film in addition to depolarization and function.

The depolarizer may be included between the adhesive layer, the polarizer and the protective film in a conventional manner. For example, a polarization release adhesive layer can be formed from an adhesive containing a depolarizer upon formation of the adhesive layer. The adhesive may include, but is not limited to, one or more of ordinary adhesives such as an aqueous adhesive, a pressure sensitive adhesive, and a UV adhesive. The polarizer may be coated, dispersed, or coated on one side of the polarizer and one side of the protective film.

The depolarization layer may include the depolarizer.

The depolarizing agent may be contained in the depolarizing layer in an amount of 0.1 to 70% by weight, preferably 1 to 60% by weight. Within the above range, there may be an effect of suppressing the occurrence of polarization depolarization and iridescence.

In one embodiment, the depolarization layer may be a coating layer comprising the depolarizing agent. The coating layer may be formed by coating a depolarizing solution containing a polarizing agent and a common solvent on a protective film or the like.

In another embodiment, the depolarizing layer may be a coating layer containing a polarizing depolarizing agent and a transparent resin for dispersing the polarizing depolarizing agent. The transparent resin may include at least one of (meth) acrylate resin, polystyrene resin, polycarbonate resin, polyester resin, and cyclic polyolefin resin, but is not limited thereto. The mixing ratio of the depolarizer in the depolarizer layer may be 1-60 wt% of the sum of the transparent resin and the depolarizer. The coating layer can be produced by coating a solution of a depolarizing solution containing a depolarizing agent and a transparent resin on a protective film or the like. The solution may further contain conventional solvents, curing agents and conventional additives for ease of coating.

The thickness of the polarization canceling layer may be 0.1 to 100 탆, preferably 1-50 탆. Within the above range, it can be used for a liquid crystal display device.

The polarizer can be used without limitation as long as it is a polarizer commonly used in the production of a polarizing plate. In an embodiment, the polarizer may include a polarizer in which a polyvinyl alcohol film is dyed with iodine or a dichroic dye and stretched in a predetermined direction. Specifically, it is produced through a swelling process, a dyeing step, a stretching step and a crosslinking step. Methods of performing each step are commonly known to those skilled in the art.

The thickness of the polarizer is not particularly limited, but may preferably be 5 占 퐉 to 30 占 퐉.

The protective film has birefringence and may include a film having a low retardation.

In an embodiment, the protective film may have a retardation value (Ro) of the following formula 1 at a wavelength of 550 nm of 10 to 10,000 nm:

<Formula 1>

Ro = (nx - ny) xd

(Where nx and ny are the refractive index in the x-axis direction and the refractive index in the y-axis direction of the protective film at a wavelength of 550 nm, respectively, and d is the thickness (unit: nm) of the protective film).

In another embodiment, the protective film may have a degree of biaxiality (Nz) of 1.5 or more, preferably 1.5 to 3.0, of the following formula 2 at a wavelength of 550 nm:

<Formula 2>

Nz = (nx - nz) / (nx - ny)

(Where nx, ny, and nz are the refractive index in the x-axis direction, the refractive index in the y-axis direction, and the refractive index in the z-axis direction of the protective film at a wavelength of 550 nm, respectively).

The protective film is a retardation film. The x-axis direction is the transverse direction of the film (TD), the y-axis direction is the machine direction of the film (MD), and the z-axis direction is the thickness direction of the film.

The protective film may be a thin or ultra thin film having a thickness of 5 to 100 탆, preferably 10 to 80 탆. In the above range, it can be used in a liquid crystal display device.

The protective film is not particularly limited, but may be a polyester film, a cyclic polyolefin (COP) film, a polycarbonate film, a polyether sulfone film, or the like, including cellulose-based film including triacetylcellulose (TAC), polyethylene terephthalate A film made of a material selected from the group consisting of polyimide, polyamide, polyimide, polyolefin, polyarylate, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride and mixtures thereof Lt; / RTI &gt; Preferably a polyethylene terephthalate (PET) film.

The adhesive layer may include, but is not limited to, one or more of ordinary adhesives such as an aqueous adhesive, a pressure sensitive adhesive, and a UV adhesive.

The adhesive layer may have a thickness of 1-50 mu m. In the above range, it can be used in a liquid crystal display device.

The polarizing plate may further include an adhesive layer, a protective film, or a laminate of an adhesive layer and a protective film on a lower surface of the polarizer.

The polarizer may have a thickness of 40 to 300 占 퐉. In the above range, it can be used in a liquid crystal display device.

1 and 2 are sectional views of a polarizing plate according to one embodiment of the present invention.

1, the polarizer 120A includes a polarizer 122, a first adhesive layer 125a formed on the upper surface of the polarizer 122, a polarizer or polarizer formed on the upper surface of the first adhesive layer 125a, And a second adhesive layer 125b formed on the lower surface of the polarizer 122. The second adhesive layer 125b is formed on the upper surface of the polarizer 122 or the polarizer 122, And a second protective film 123 formed on the lower surface of the adhesive layer 125b.

2, the polarizing plate 120B includes a polarizer 122, a first adhesive layer 125c formed on the upper surface of the polarizer 122 and including a depolarizing layer or a depolarizing layer containing the same, A second adhesive layer 125b formed on a lower surface of the first polarizer 122 and a second adhesive layer 125b formed on a lower surface of the second adhesive layer 125b. And may include a protective film 123.

A module for a liquid crystal display device according to another aspect of the present invention includes a liquid crystal display panel and a polarizing plate laminated on one or both surfaces of the liquid crystal display panel and comprising a polarizer, an adhesive layer and a protective film sequentially laminated, At least one of the one surface of the protective film and the protective film may include a depolarizing agent or a polarizing resolution layer containing the same.

The polarizer may further include at least one protective film, for example, a protective film having a phase difference, on the other surface of the polarizer.

In an embodiment, the module for a liquid crystal display comprises: a liquid crystal display panel; An upper polarizer laminated on an upper surface of the liquid crystal display panel and including a first polarizer, a first adhesive layer formed on an upper surface of the first polarizer, and a first protective film formed on an upper surface of the first adhesive layer; And a fourth adhesive layer laminated between a lower surface of the liquid crystal display panel and the liquid crystal display panel and a light source, the fourth adhesive layer being formed on the lower surface of the second polarizer, the fourth adhesive layer formed on the lower surface of the fourth adhesive layer, Wherein at least one of the lower surface of the fourth protective film between the first protective film and the first polarizer, between the second polarizer and the fourth protective film, And may include a depolarizing layer containing the same.

In an embodiment, the module may further include at least one of a second protective film laminated on the lower surface of the first polarizer, and a third protective film laminated on the upper surface of the second polarizer.

In another embodiment, the module further comprises a second adhesive layer formed on the lower surface of the first polarizer, a second protective film laminated on the lower surface of the second adhesive layer, a third adhesive layer formed on the upper surface of the second polarizer, And a third protective film formed on the upper surface of the third adhesive layer.

In one embodiment, the module for a liquid crystal display comprises: a liquid crystal display panel; A first polarizer, a first adhesive layer formed on an upper surface of the first polarizer, a first protective film formed on an upper surface of the first adhesive layer, a second protective film formed on a lower surface of the first polarizer, An upper polarizer plate having a second adhesive layer formed thereon, and a second protective film formed on a lower surface of the second adhesive layer; And a fourth adhesive layer laminated on a lower surface of the liquid crystal display panel and between the liquid crystal display panel and the light source and having a second polarizer, a fourth adhesive layer formed on a lower surface of the second polarizer, A third adhesive layer formed on an upper surface of the second polarizer, and a third protective film formed on an upper surface of the third adhesive layer, wherein the first adhesive layer, the fourth adhesive layer, At least one of the film and the first polarizer, between the second polarizer and the fourth protective film, and the lower surface of the fourth protective film may include a depolarizing agent or a depolarizing layer containing the same.

Preferably, at least one of the first adhesive layer, the fourth adhesive layer, the lower surface of the first protective film, the upper surface of the fourth protective film, and the lower surface of the fourth protective film includes a depolarizer And a polarizing filter layer.

The liquid crystal display panel is usually included in a liquid crystal display device and includes a twisted nematic (TN), a super twisted nematic (STN) liquid crystal polarizing plate, a VA mode, an IPS (In-Plane Switching) And a horizontal alignment mode such as FFS (Fringe Field Switching).

The thicknesses of the first polarizer and the second polarizer are not particularly limited, but may be preferably 5 占 퐉 to 30 占 퐉.

The first protective film and the fourth protective film are films having a low retardation, and may have a thickness of Ro, Nz, and thickness described above.

Although the first protective film and the fourth protective film are not particularly limited, examples thereof include a polyester-based, cyclic polyolefin (COP) -based film including cellulose-based or polyethylene terephthalate (PET) containing triacetylcellulose (TAC) A polyvinyl alcohol-based, a polyvinyl chloride-based, a polyvinylidene chloride-based, or a mixture thereof, which is selected from the group consisting of polycarbonate, polyether sulfone, polysulfone, polyamide, polyimide, polyolefin, polyarylate, And the like. Preferably a polyethylene terephthalate (PET) film.

The first protective film and the fourth protective film may have the same or different Ro, Nz, thickness, and / or material.

The second protective film and the third protective film may include a conventional protective film. For example, it is possible to use a polyester-based, a cyclic polyolefin (COP) -based, a polycarbonate-based, a polyether sulfone-based, a polysulfone-based, or a polysulfone- based material including cellulose-based materials including triacetylcellulose (TAC), polyethylene terephthalate , A film made of a material selected from the group consisting of polyamide, polyimide, polyolefin, polyarylate, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, and mixtures thereof.

The second protective film and the third protective film may be a retardation compensation film having a retardation. This can adjust the phase difference by adjusting the optical characteristics of light passing through the liquid crystal display panel, or have a viewing angle improving function. In an embodiment, each of the second protective film and the third protective film may have an in-plane retardation (Ro) of 0-10,000 nm at a wavelength of 550 nm.

The second protective film and the third protective film may each have a thickness of 10 mu m to 100 mu m. In the above range, it is possible to provide an optical compensation effect when used in a polarizing plate, have a good polarization state with respect to the liquid crystal, and have an effect of preventing color change and stain. Preferably 20 占 퐉 to 80 占 퐉 thickness.

The second protective film and the third protective film may have the same or different in-plane retardation value, thickness, and / or material.

The upper polarizer plate may be laminated on the liquid crystal display panel by the first adhesive layer and the lower polarizer plate may be laminated on the liquid crystal display panel by the second adhesive layer. The first adhesive layer and the second adhesive layer may be a pressure sensitive adhesive (PSA), for example, an adhesive layer containing a (meth) acrylic copolymer.

The thicknesses of the first adhesive layer and the second adhesive layer may be 1-20 占 퐉, respectively. In the above range, it can be used in a liquid crystal display device.

The first protective film, the second protective film, the third protective film and / or the fourth protective film may further include a surface coating layer. Preferably, a surface coating layer may be formed between the polarizer and the protective film.

The protective film is generally hydrophobic on the surface, and hydrophobicity is increased particularly when a PET film is used as a protective film. In order to use such a film as a polarizing plate, a surface modification that converts it to a hydrophilic property is required. Such surface modification may not sufficiently modify the surface of the film or may damage the surface of the film by using the sodium hydroxide used in conventional cellulose-based films. To this end, a surface coating layer comprising a primer having hydrophobic and hydrophilic functional groups can be formed on the protective film. The primer having a hydrophobic and hydrophilic functional group may include, but is not limited to, a polyester-based resin, a polyvinyl acetate-based resin, or a combination thereof.

By adding such a surface coating layer, by maximizing the mechanical properties and low moisture permeability of the protective film, a high resistance against external harsh conditions can be added to the polarizing plate. Further, the surface coating layer is formed between the protective film and the polarizing plate, so that the adhesion between the protective film and the polarizing film can be improved.

The first protective film may further include a functional layer on one side or both sides, preferably the top side. The functional layer may include a conventional functional layer such as a hard coating layer, an antireflection layer, and an antistatic layer.

The liquid crystal display module may be integrated. The 'integrated type' means that the polarizer, the protective film, the adhesive layer, the depolarizing agent or the depolarizing layer, and the liquid crystal display panel included in the module are independent from each other and constitute one unit.

3 to 7 are sectional views of a module for a liquid crystal display device according to one embodiment of the present invention. 3 to 7 show a module including a lower polarizer plate between a liquid crystal display panel and a light source.

3, the module 100A for a liquid crystal display includes a liquid crystal display panel 110, an upper polarizer 120 formed on the upper surface of the liquid crystal display panel 110, And a lower polarizer plate 130 formed between the liquid crystal display panel 110 and the light source and the upper polarizer plate 120 may be attached to the liquid crystal display panel 110 by a first adhesive layer 140, The lower polarizer 130 may be attached to the liquid crystal display panel 110 by a second adhesive layer 150.

The upper polarizer 120 includes a first polarizer 122, a first adhesive layer 125a formed on the upper surface of the first polarizer 122, a first protective film 125a formed on the upper surface of the first adhesive layer 125a, A second adhesive layer 125b formed on a lower surface of the first polarizer 122 and a second protective film 123 formed on a lower surface of the second adhesive layer 125b, The lower surface of the film 121 may include a depolarizing or depolarizing layer 124. The lower polarizer 130 includes a second polarizer 132, a third adhesive layer 135a formed on the upper surface of the second polarizer 132, and a third protective film 135b formed on the upper surface of the third adhesive layer 135a. A fourth adhesive layer 135b formed on the lower surface of the second polarizer 132 and a fourth protective film 133 formed on the lower surface of the fourth adhesive layer 135b.

4, a liquid crystal display module 100B includes a liquid crystal display panel 110, an upper polarizer 120 formed on the upper surface of the liquid crystal display panel 110, And a lower polarizer plate 130 formed between the liquid crystal display panel 110 and the light source and the upper polarizer plate 120 may be attached to the liquid crystal display panel 110 by a first adhesive layer 140, The lower polarizer 130 may be attached to the liquid crystal display panel 110 by a second adhesive layer 150.

The upper polarizer 120 includes a first polarizer 122, a first adhesive layer 125c formed on the upper surface of the first polarizer 122, a first protective film 125c formed on the upper surface of the first adhesive layer 125c, A second adhesive layer 125b formed on a lower surface of the first polarizer 122 and a second protective film 123 formed on a lower surface of the second adhesive layer 125b, 125c may comprise a depolarizing agent or a depolarizing layer containing it. The lower polarizer 130 includes a second polarizer 132, a third adhesive layer 135a formed on the upper surface of the second polarizer 132, and a third protective film 135b formed on the upper surface of the third adhesive layer 135a. 131 and a fourth adhesive layer 135b formed on the lower surface of the second polarizer 132 and a fourth protective film 133 formed on the lower surface of the fourth adhesive layer 135b.

8 (a), 8 (b) and 8 (c) are enlarged cross-sectional views of the first adhesive layer 125c including the depolarization layer. 8, the first adhesive layer 125c includes a polarization canceling layer 126, and the polarization canceling layer 126 is disposed on the upper portion including the upper surface of the first adhesive layer 125c (FIG. 8A), the lower part of the first adhesive layer 125c (FIG. 8B) including the lower surface, the remaining part of the first adhesive layer 125c except the upper part and the lower part c).

5, a liquid crystal display module 100C includes a liquid crystal display panel 110, an upper polarizer 120 formed on the upper surface of the liquid crystal display panel 110, And a lower polarizer plate 130 formed between the liquid crystal display panel 110 and the light source and the upper polarizer plate 120 may be attached to the liquid crystal display panel 110 by a first adhesive layer 140, The lower polarizer 130 may be attached to the liquid crystal display panel 110 by a second adhesive layer 150.

The upper polarizer 120 includes a first polarizer 122, a first adhesive layer 125a formed on the upper surface of the first polarizer 122, a first protective film 125a formed on the upper surface of the first adhesive layer 125a, 121 and a second adhesive layer 125b formed on the lower surface of the first polarizer 122 and a second protective film 123 formed on the lower surface of the second adhesive layer 125b.

The lower polarizer 130 includes a second polarizer 132, a third adhesive layer 135a formed on the upper surface of the second polarizer 132, and a third protective film 135b formed on the upper surface of the third adhesive layer 135a. A fourth adhesive layer 135c formed on the lower surface of the second polarizer 132 and a fourth protective film 133 formed on the lower surface of the fourth adhesive layer 135c, 135c may comprise a depolarizing agent or a depolarizing layer containing the same. The fourth adhesive layer 135c may include a depolarization layer in the same manner as the first adhesive layer 125c of FIG.

6, a liquid crystal display module 100D includes a liquid crystal display panel 110, an upper polarizer 120 formed on the upper surface of the liquid crystal display panel 110, And a lower polarizer plate 130 formed between the liquid crystal display panel 110 and the light source and the upper polarizer plate 120 may be attached to the liquid crystal display panel 110 by a first adhesive layer 140, The lower polarizer 130 may be attached to the liquid crystal display panel 110 by a second adhesive layer 150.

The upper polarizer 120 includes a first polarizer 122, a first adhesive layer 125a formed on the upper surface of the first polarizer 122, a first protective film 125a formed on the upper surface of the first adhesive layer 125a, 121, a second adhesive layer 125b formed on the lower surface of the first polarizer 122 and a second protective film 123 formed on the lower surface of the second adhesive layer 125b.

The lower polarizer 130 includes a second polarizer 132, a third adhesive layer 135a formed on the upper surface of the second polarizer 132, and a third protective film 135b formed on the upper surface of the third adhesive layer 135a. 131, a fourth adhesive layer 135c formed on the lower surface of the second polarizer 132 and a fourth protective film 133 formed on the lower surface of the fourth adhesive layer 135c, And a depolarization layer 134 including a polarization depolarizer on the upper surface of the first polarizer 133.

7, a liquid crystal display module 100E includes a liquid crystal display panel 110, an upper polarizer 120 formed on the upper surface of the liquid crystal display panel 110, And a lower polarizer plate 130 formed between the liquid crystal display panel 110 and the light source and the upper polarizer plate 120 may be attached to the liquid crystal display panel 110 by a first adhesive layer 140, The lower polarizer 130 may be attached to the liquid crystal display panel 110 by a second adhesive layer 150.

The upper polarizer 120 includes a first polarizer 122, a first adhesive layer 125a formed on the upper surface of the first polarizer 122, a first protective film 125a formed on the upper surface of the first adhesive layer 125a, 121 and a second adhesive layer 125b formed on the lower surface of the first polarizer 122 and a second protective film 123 formed on the lower surface of the second adhesive layer 125b.

The lower polarizer 130 includes a second polarizer 132, a third adhesive layer 135a formed on the upper surface of the second polarizer 132, and a third protective film 135b formed on the upper surface of the third adhesive layer 135a. A fourth adhesive layer 135b formed on the lower surface of the second polarizer 132 and a fourth protective film 133 formed on the lower surface of the fourth adhesive layer 135b, And a depolarizing layer 136 including a depolarizing agent on the lower surface of the polarizer 133.

The liquid crystal display device according to another aspect of the present invention may include the liquid crystal display device module.

9 is a cross-sectional view of a liquid crystal display device according to one embodiment of the present invention.

9, the liquid crystal display 100F includes a liquid crystal display panel 110, an upper polarizer 120 laminated on the upper surface of the liquid crystal display panel 110 by a first adhesive layer 140, And a lower polarizer 130 laminated by a second adhesive layer 150 between the display panel 110 and the light source 200 and on the lower surface of the liquid crystal display panel 110.

The light source unit 200 may include a backlight unit including a light source, a light guide plate, and a prism sheet. The upper polarizer 120 includes a first polarizer 122, a first adhesive layer 125a formed on the upper surface of the first polarizer 122, a first protective film 125a formed on the upper surface of the first adhesive layer 125a, A second adhesive layer 125b formed on the lower surface of the first polarizer 122 and a second protective film 123 formed on the lower surface of the second adhesive layer 125b.

The lower polarizer 130 includes a second polarizer 132, a third adhesive layer 135a formed on the upper surface of the second polarizer 132, and a third protective film 135b formed on the upper surface of the third adhesive layer 135a. A fourth adhesive layer 135b formed on the lower surface of the second polarizer 132 and a fourth protective film 133 formed on the lower surface of the fourth adhesive layer 135b, And a depolarizing layer 136 including a depolarizing agent on the lower surface of the polarizer 133.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

(1) Polarizer material: polyvinyl alcohol film (VF-PS6000, Kuraray Co., Ltd., thickness: 60 m)

(2) First protective film and fourth protective film: A polyethylene terephthalate (PET) film (PET 1) having an in-plane retardation value (Ro) of 8,000 nm and a thickness of 80 탆 at a wavelength of 550 nm or a retardation value ) Of 6,000 nm and a thickness of 60 탆 (PET 2) (TOYOBO).

(3) Second protective film, third protective film: triacetyl cellulose film (FUJIFILM).

(4) Polarizer: Porous polyamide particles (UBE INDUSTRIES LTD), cellulose nanofibers

Example  One

The polyvinyl alcohol film was stretched three times at 60 ° C, adsorbed iodine, and stretched 2.5 times in an aqueous boric acid solution at 40 ° C to prepare a first polarizer. A first polarizing plate was prepared by adhering a first protective film (PET 1) to one surface of the first polarizer and a second protective film to the other surface using an adhesive (Z-200, manufactured by Nippon Goshei).

A second polarizer was prepared in the same manner as described above. A fourth protective film (PET 1), on which a third protective film was formed on one surface of the second polarizer and a polarizer layer containing porous polyamide particles were formed on the other surface, was adhered using an adhesive (Z-200, manufactured by Nippon Goshei) To prepare a lower polarizer plate. Using the pressure-sensitive adhesive PSA, the above-prepared upper polarizer and lower polarizer were adhered to the liquid crystal display panel with the structure shown in Fig. 7 to prepare a module for a liquid crystal display device.

Example  2

A module was fabricated in the same manner as in Example 1, except that the cellulose nanofibers were used in place of the porous polyamide particles in the depolarizing layer.

Example  3

A module was prepared in the same manner as in Example 1 except that PET 2 was used instead of PET 1 as the first protective film and the fourth protective film.

Example  4

In Example 3, the module was fabricated in the same manner except that the polymer nanofiber was used in place of the porous polyamide particles in the depolarizing layer.

Comparative Example  One

A liquid crystal display module was manufactured in the same manner as in Example 1, except that a polarizing resolution layer was not formed on one side of the fourth protective film.

The module for a liquid crystal display and the backlight unit manufactured in the above Examples and Comparative Examples were assembled. The occurrence of rainbow stains was evaluated as a visual assessment.

The rainbow irregularities did not occur in the modules for the liquid crystal display devices of Examples 1, 2, and 3. In Example 4, the rainbow irregularity could not be completely eliminated as in the previous embodiment, but it was confirmed that the module has some effect. It was confirmed that the module for a liquid crystal display device of Comparative Example 1 caused strong iridescence.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (24)

A polarizer, an adhesive layer, and a protective film are sequentially laminated,
And at least one polarizer and a depolarizing layer between the polarizer and the protective film.
The polarizing plate according to claim 1, wherein the polarizer or the depolarizing layer is included in at least one of the adhesive layer and one side of the protective film.
The polarizer of claim 1, wherein the protective film comprises a polyethylene terephthalate (PET) film.
The polarizing plate according to claim 1, wherein the protective film has a thickness of 5 to 100 탆.
The polarizing plate according to claim 1, wherein the protective film has a retardation value (Ro) of the following formula 1 at a wavelength of 550 nm of 10 to 10,000 nm:
<Formula 1>
Ro = (nx - ny) xd
(Where nx and ny are the refractive index in the x-axis direction and the refractive index in the y-axis direction of the protective film at a wavelength of 550 nm, respectively, and d is the thickness (unit: nm) of the protective film).
The polarizing plate according to claim 1, wherein the protective film has a birefringence (Nz) of 1.5 or more at a wavelength of 550 nm represented by the following formula (2): <
<Formula 2>
Nz = (nx - nz) / (nx - ny)
(Where nx, ny and nz are the refractive index in the x-axis direction, the refractive index in the y-axis direction, and the refractive index in the z-axis direction, respectively, at a wavelength of 550 nm).
The polarizing plate according to claim 1, wherein the depolarizing agent includes a rod, a sphere, a fiber, or a combination of a rod and a sphere.
The polarizer of claim 1, wherein the depolarizer is porous or non-porous.
The polarizer according to claim 1, wherein the polarizer is formed of at least one of cellulose, polymethylmethacrylate, polystyrene, polyamide, polyimide, and polycarbonate.
The polarizer according to claim 1, wherein the polarizer is formed of at least one of silica (SiO 2 ), alumina (Al 2 O 3 ), titania (TiO 2 ), zirconia (ZrO 2 ), and zinc oxide (ZnO).
The polarizing plate according to claim 1, wherein the depolarizing agent comprises polyamide porous particles.
The polarizer according to claim 11, wherein the polarizer is an average particle diameter of 0.1 to 30 占 퐉.
12. The polarizer according to claim 11, wherein the polarizer is a BET specific surface area of 1 to 300 m 2 / g.
12. The polarizer according to claim 11, wherein the polarizer is 0.01-0.5 mu m in average microvoids.
The polarizing plate according to claim 1, wherein the depolarizing agent comprises rod-shaped particles having a length in the longitudinal direction of 0.1 to 500 m and a thickness in the single direction of 0.01 to 50 m.
16. The polarizer according to claim 15, wherein the polarizer is a refractive index of 1.4 to 1.9.
The polarizer according to claim 1, wherein the depolarizing layer comprises the polarizer and a transparent resin.
The polarizing plate according to claim 1, wherein the polarization canceling layer has a thickness of 0.1 to 100 탆.
The polarizer of claim 1, further comprising a protective film laminated on one surface of the polarizer.
The polarizing plate according to claim 19, wherein the protective film has a retardation.
The method according to claim 19, wherein the protective film is at least one of cellulose, polyester, A film formed of at least one of polyvinyl alcohol-based, polyvinyl chloride-based, and polyvinylidene chloride-based films.
A liquid crystal display panel; An upper polarizer laminated on an upper surface of the liquid crystal display panel and including a first polarizer, a first adhesive layer formed on an upper surface of the first polarizer, and a first protective film formed on an upper surface of the first adhesive layer; And a fourth adhesive layer laminated between a lower surface of the liquid crystal display panel and the liquid crystal display panel and a light source, the fourth adhesive layer being formed on the lower surface of the second polarizer, the fourth adhesive layer formed on the lower surface of the fourth adhesive layer, Wherein at least one of the lower surface of the fourth protective film between the first protective film and the first polarizer, between the second polarizer and the fourth protective film, And at least one of a depolarizing layer comprising the same.
The liquid crystal display device according to claim 22, wherein the depolarizing agent or the depolarizing layer is disposed between the first adhesive layer, the fourth adhesive layer, the lower surface of the first protective film, the upper surface of the fourth protective film, And the lower surface of the module.
A liquid crystal display device comprising the liquid crystal display module according to claim 22 or claim 23.
KR1020130031163A 2013-03-22 2013-03-22 Polarizing plate, module for liquid crystal display and liquid crystal display comprising the same KR20140115882A (en)

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Cited By (7)

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KR20160088751A (en) * 2015-01-16 2016-07-26 에스케이씨 주식회사 Protective film and method for fabricating display device using same
KR20160105276A (en) * 2015-10-01 2016-09-06 삼성에스디아이 주식회사 Polarizing plate and liquid crystal display apparatus comprising the same
KR20160105667A (en) * 2015-02-27 2016-09-07 삼성에스디아이 주식회사 Polarizing plate and liquid crystal display apparatus comprising the same
KR20170052343A (en) * 2015-11-04 2017-05-12 삼성에스디아이 주식회사 Polarizer plate and liquid crystal display including the same
JP2019124917A (en) * 2018-01-11 2019-07-25 東洋紡株式会社 Liquid crystal display device
CN111026288A (en) * 2019-11-29 2020-04-17 武汉华星光电技术有限公司 Display module and bonding method thereof
US10775539B2 (en) 2015-02-27 2020-09-15 Samsung Sdi Co., Ltd. Polarizing plate and liquid crystal display comprising the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160088751A (en) * 2015-01-16 2016-07-26 에스케이씨 주식회사 Protective film and method for fabricating display device using same
KR20160105667A (en) * 2015-02-27 2016-09-07 삼성에스디아이 주식회사 Polarizing plate and liquid crystal display apparatus comprising the same
US10775539B2 (en) 2015-02-27 2020-09-15 Samsung Sdi Co., Ltd. Polarizing plate and liquid crystal display comprising the same
US11988811B2 (en) 2015-02-27 2024-05-21 Samsung Sdi Co., Ltd. Polarizing plate and liquid crystal display comprising the same
KR20160105276A (en) * 2015-10-01 2016-09-06 삼성에스디아이 주식회사 Polarizing plate and liquid crystal display apparatus comprising the same
KR20170052343A (en) * 2015-11-04 2017-05-12 삼성에스디아이 주식회사 Polarizer plate and liquid crystal display including the same
JP2019124917A (en) * 2018-01-11 2019-07-25 東洋紡株式会社 Liquid crystal display device
CN111026288A (en) * 2019-11-29 2020-04-17 武汉华星光电技术有限公司 Display module and bonding method thereof
CN111026288B (en) * 2019-11-29 2023-11-28 武汉华星光电技术有限公司 Display module and attaching method thereof

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