KR20150122410A - Polarizing plate and liquid crystal display device comprising the same - Google Patents
Polarizing plate and liquid crystal display device comprising the same Download PDFInfo
- Publication number
- KR20150122410A KR20150122410A KR1020140048593A KR20140048593A KR20150122410A KR 20150122410 A KR20150122410 A KR 20150122410A KR 1020140048593 A KR1020140048593 A KR 1020140048593A KR 20140048593 A KR20140048593 A KR 20140048593A KR 20150122410 A KR20150122410 A KR 20150122410A
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- KR
- South Korea
- Prior art keywords
- retardation film
- film
- wavelength
- polarizing plate
- liquid crystal
- Prior art date
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Classifications
-
- 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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- 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
- 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
Abstract
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate and a liquid crystal display including the polarizing plate, and more particularly, to a polarizing plate capable of providing an excellent image quality without being restricted by the polarization axis of polarizing sunglasses and a liquid crystal display including the same.
A liquid crystal display (LCD) includes a liquid crystal cell (also referred to as a substrate) containing a liquid crystal and a polarizer adhered to at least one surface of the liquid crystal cell.
The polarizing plate includes a polarizer (also referred to as a polarizing film). Generally, a polarizer protective film for protecting the polarizer, a pressure-sensitive adhesive layer for bonding the liquid crystal cell, a release film for protecting the pressure- And a polarizer protective film and a surface protective film for protecting the polarizer are laminated on the other surface of the polarizer.
On the other hand, when the user views the polarizing plate attached with the polarizing plate by wearing the polarizing sunglasses, the viewing angle of the polarizing plate (transmission axis) of the polarizing plate provided in the liquid crystal display device and the polarizing axis So that the liquid crystal display device is restricted by the polarization axis of the polarizing sunglasses.
As a method for overcoming this problem, Korean Patent Laid-Open No. 2007-0080497 (referred to as Prior art 1) uses a? / 4 retardation film containing an ultraviolet screening material and Korean Patent Publication No. 2010-0048187 Quot;) discloses a technique in which a polarizing axis of a polarizing sunglass is relatively unrestricted by using an amorphous polyolefin-based? / 4 retardation film.
However, since the prior art 1 does not limit the optical characteristics, there is a problem in that visibility may be caused depending on optical characteristics when polarized sunglasses are worn, and it is difficult to include ultraviolet shielding material in the outermost layer. (Cyclo Olefin Polymer) has a problem that the liquid crystal display device is yellow when cross nicole.
It is an object of the present invention to provide a polarizing plate capable of providing an excellent image quality without being restricted by the polarization axis (transmission axis) of polarizing sunglasses and a liquid crystal display device including the same will be.
Another object of the present invention is to provide a polarizing plate comprising a retardation film having a front retardation value of 90 to 110 nm, a wavelength dispersion of 447 nm of 0.91 to 0.97, and a wavelength dispersion of 745 nm of 1.01 to 1.05, and a liquid crystal display will be.
On the other hand, the present invention relates to a polarizer for polarizing light; And a retardation film for retarding the phase of the light, wherein the phase retardation value of the retardation film is 90 to 110 nm, the wavelength dispersion of 447 nm is 0.91 to 0.97, and the wavelength dispersion of 745 nm is 1.01 to 1.05.
Preferably, the wavelength dispersion of the retardation film at 545 nm is 0.98 to 1.01.
The angle formed by the slow axis of the retardation film and the transmission axis of the polarizer is 43 to 46 degrees, preferably 45 degrees.
The polarizing plate may further include a support layer that is laminated on the polarizer and supports the polarizer, and the support layer may include a zero-retardation film, a retardation film having a positive B plate and a negative B plate coupled thereto, A retardation film combined with a positive C plate, a 1/4 wavelength retardation film, a retardation film combining a 1/2 wavelength retardation film and a 1/4 wavelength retardation film, a protective layer, a 1/2 wavelength liquid crystal coating layer, A liquid crystal coating layer-coupled retardation film, a 1/2 wavelength retardation film, a 1/4 wavelength retardation film and a C plate combined retardation film, a protective layer, a 1/2 wavelength liquid crystal coating layer, a 1/4 wavelength liquid crystal coating layer and a C plate May be formed of at least one of the retardation films.
The polarizing plate according to the present invention and the liquid crystal display device having the polarizing plate according to the present invention have an effect of providing an excellent image quality regardless of the polarization axis (transmission axis) of the polarizing sunglass.
In addition, the polarizing plate according to the present invention can prevent the yellowish when the polarizing axis (transmission axis) and the cross nicole of the polarizing sunglasses are blocked, and provides a brighter image by increasing the transmittance at the time of parallel nicole can do.
1 is a configuration diagram of a polarizing plate according to an embodiment of the present invention.
Fig. 2 shows the result of observing a liquid crystal display device with polarizing sunglasses fitted with Example 1 (invention), Comparative Example 1 (COP series film) and Comparative Example 2 (PET series film).
Fig. 3 shows the wavelength dispersibility of Example 1 (invention), Comparative Example 1 (COP series film) and Comparative Example 2 (PET series film).
4 shows xy chromaticity coordinates for Example 1 (invention), Comparative Example 1 (COP series film) and Comparative Example 2 (PET series film).
FIG. 5 shows white luminance and xy chromaticity coordinates when the front retardation is 80 nm, 100 nm and 120 nm for the same polarizer structure (the structure of FIG. 1).
Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
1 is a configuration diagram of a polarizing plate according to an embodiment of the present invention.
The polarizing
<Protection film>
The
Specifically, polyester resins such as polyethylene terephthalate, polyethylene isophthalate and polybutylene terephthalate; Cellulose-based resins such as diacetylcellulose and triacetylcellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, cyclo- or norbornene-structured polyolefins, and ethylene propylene copolymers; Vinyl chloride resin; Polyamide resins such as nylon and aromatic polyamide; Imide resin; Polyether sulfone type resin; Sulfone based resin; Polyether ketone resin: a polyphenylene sulfide resin; Vinyl alcohol-based resin; Vinylidene chloride resins; Vinyl butyral resin; Allylate series resin; Polyoxymethylene type resin; Epoxy resin, and the like, and a film composed of the blend of the thermoplastic resin may also be used. Further, a film made of a thermosetting resin such as (meth) acrylic, urethane, epoxy, or silicone or a film made of an ultraviolet curable resin may be used. Among them, a cellulose-based film having a surface saponified (saponified) by alkali or the like is preferable in consideration of polarization characteristics or durability. In addition, the protective film may have the function of an optical compensation layer.
< Phase difference Film>
The
The kind of the polymer compound constituting the polymer film is not particularly limited. In this case, it is preferable to use a polymer compound having high transparency so as to be suitable for use in a liquid crystal display device. Such a compound may be a polycarbonate compound, a polyester compound, a polysulfone compound, a polyether sulfone compound, a polystyrene compound , A polyolefin compound, a polyvinyl alcohol compound, a cellulose acetate compound, a polymethyl methacrylate compound, a polyvinyl chloride compound, a polyacrylate polyvinyl chloride compound, and a polyamide polyvinyl chloride compound.
Further, the retardation film can be made of nematic or smectic, preferably nematic liquid crystal material polymerizable by in situ polymerization. As specific examples, a polymerizable liquid crystal material may be coated on a substrate and aligned in a plane orientation, followed by polymerization by exposure to heat or ultraviolet light.
However, it is preferable that the retardation film is formed of triacetyl cellulose (TAC) or polycarbonate.
The retardation film according to the polarizing plate of the present invention has a front retardation (Ro) of 90 to 110 nm, a wavelength dispersion (R (447)) of 447 nm of 0.91 to 0.97 and a wavelength dispersion (R 0.98 to 1.01, and a wavelength dispersibility (R (745)) of 745 nm is 1.01 to 1.05.
For reference, the wavelength dispersibility in the present invention can be defined as shown in Equation 1 below.
[Equation 1]
The wavelength dispersion (R (?)) Of each wavelength band = the phase difference Ro (?) At each wavelength band / the phase difference Ro (589 nm) at the center wavelength (589 nm)
< Polarizer >
The
For example, a PVA (polyvinyl alcohol) film is dyed with iodine or a dichroic dye, and a polarizer or a transparent substrate produced by stretching the film in a certain direction has a fine pattern of conductive gratings having a polarizing function, A thin plate polarizing plate coated with a polarizing plate or the like can be used.
The polyvinyl alcohol resin constituting the polarizer can be produced by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include copolymers of vinyl acetate and other monomers copolymerizable with vinyl acetate in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate. Specific examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers, acrylamides having an ammonium group, and the like. In addition, the polyvinyl alcohol resin may be modified. For example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The degree of saponification of the polyvinyl alcohol resin may be generally 85 to 100 mol%, preferably 98 mol% or more. The polymerization degree of the polyvinyl alcohol resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.
Such a polyvinyl alcohol-based resin is formed into a film and used as a polarizer. The film-forming method of the polyvinyl alcohol-based resin is not particularly limited, and various known methods can be used. The film thickness of the polyvinyl alcohol-based resin is not particularly limited, and may be, for example, 10 to 150 mu m.
The polarizer is usually produced by a process of uniaxially stretching a polyvinyl alcohol film as described above, dyeing with a dichroic dye and adsorbing, treating with an aqueous boric acid solution, and washing and drying.
The step of uniaxially stretching the polyvinyl alcohol film may be performed before dyeing, concurrently with dyeing, or after dyeing. If uniaxial stretching is carried out after dyeing, it may be carried out before the boric acid treatment or during the boric acid treatment. Of course, it is also possible to perform uniaxial stretching in a plurality of these steps. As the uniaxial stretching, other rolls or rolls having different circumferences may be used, and may be dry stretching by stretching in air or wet stretching by stretching in the state of being swollen by a solvent. The stretching ratio is usually 3 to 8 times.
In the step of dyeing a stretched polyvinyl alcohol film with a dichroic dye, for example, a method of immersing a polyvinyl alcohol film in an aqueous solution containing a dichroic dye may be used. A specific example of the dichroic dye is iodine or a dichroic dye. Further, it is preferable that the polyvinyl alcohol-based film is pre-immersed in water before dyeing to swell
≪ Support layer >
The supporting
Example One
The retardation film constituting the polarizing plate had a front retardation (Ro) of 90 nm, a wavelength dispersion of 447 nm (R (447)) of 0.91 to 0.97, and a wavelength dispersion of 545 nm (TAC; triacetyl cellulose) film having a wavelength dispersion (R (545)) of 0.98 to 1.01 and a wavelength dispersion of 745 nm (R (745)) of 1.01 to 1.05 was used.
Example 2
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 100 nm is used as the retardation film.
Example 3
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 110 nm is used as the retardation film.
Comparative Example 1-1
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 60 nm is used as the retardation film.
Comparative Example 1-2
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 80 nm is used as the retardation film.
Comparative Example 1-3
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 130 nm is used as the retardation film.
Comparative Example 1-4
The structure of the polarizing plate is the same as in the above embodiment, and a film having a retardation value (Ro) of 150 nm is used as the retardation film.
Comparative Example 2-1
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 60 nm as a flat wavelength dispersive phase retardation film constituting a polarizing plate (COP (Cyclo Olefin Polymer)) was used.
Comparative Example 2-2
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 80 nm of a COP (Cyclo Olefin Polymer) series is used as a flat wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 2-3
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 90 nm of COP (cycloolefin polymer) is used as a flat wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 2-4
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 100 nm of COP (Cyclo Olefin Polymer) is used as a flat wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 2-5
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 110 nm of COP (Cyclo Olefin Polymer) is used as a flat wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 2-6
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 130 nm of COP (Cyclo Olefin Polymer) is used as a flat wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 2-7
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 150 nm of a COP (Cyclo Olefin Polymer) series is used as a flat wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-1
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 60 nm of PET (polyethylene terephthalate) series is used as a regular wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-2
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 80 nm of PET (polyethylene terephthalate) series is used as a regular wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-3
The structure of the polarizing plate is the same as that of the above embodiment, and a film having a front retardation (Ro) of 90 nm of PET (polyethylene terephthalate) series is used as a regular wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-4
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 100 nm of a PET (polyethylene terephthalate) series is used as a regular wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-5
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 110 nm of PET (Polyethylene Terephthalate) is used as a regular wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-6
The structure of the polarizing plate is the same as in the above embodiment, and a film having a front retardation (Ro) of 130 nm of PET (Polyethylene Terephthalate) series is used as a regular wavelength dispersive retardation film constituting a polarizing plate.
Comparative Example 3-7
The structure of the polarizing plate is the same as in the above embodiment, and a film having a retardation value (Ro) of 150 nm in the PET (polyethylene terephthalate) series is used as the regular wavelength dispersive retardation film constituting the polarizing plate.
Experimental Example
The results of observing a liquid crystal display device with polarizing sunglasses attached with Example 2 (present invention), Comparative Example 2-4 (COP series film) and Comparative Example 3-4 (PET series film) Comparative Example 2-4 (COP series film) and Comparative Example 3-4 (PET series film) were yellow when the transmission axis of the polarizing plate on the liquid crystal display device and the transmission axis of the polarizing sunglasses coincided (parallel Nicole) City will interfere. However, the embodiment 2 (invention) is able to see the original color of the bright display without coloring.
The results of measuring the wavelength dispersibility of Example 2 and Comparative Examples 2-4 and 3-4 are shown in FIG. 3, and the x-y color coordinates are as shown in FIG.
Referring to FIGS. 3 and 4, it can be seen that Comparative Examples 2-4 and 3-4 have more yellow in Parallel Nicole than Example 2. This shows that the yellow color coordinates .
[Table 1] Color coordinates
FIG. 5 is a graph showing the relationship between the retardation of the retardation film and the retardation value of the retardation film of the white (white) film when the front retardation is 80 nm (Comparative Example 1-2), 100 nm (Inventive Example; Example 2) White) brightness and xy color coordinates.
Referring to FIG. 5, when the front retardation Ro of the retardation film is out of 90 to 110 nm and when the transmission axis of the polarizing plate provided in the liquid crystal display device is parallel to the transmission axis of the polarizing sunglass, When the transmission axis of the polarizing plate is orthogonal to the transmission axis of the polarizing sunglasses, the white luminance is greatly decreased and the visibility is decreased.
[Table 2] Color coordinates
[Table 3] White luminance and color performance according to frontal retardation value
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is obvious that it is not.
Therefore, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is defined by its equivalents.
100: polarizer
110: protective film
120: retardation film
130: Polarizer
140: Support layer
200: liquid crystal display
Claims (10)
A polarizer for polarizing light; And
And a phase difference film for retarding the phase of the light,
Wherein the retardation film has a front retardation value of 90 to 110 nm, a wavelength dispersion of 447 nm of 0.91 to 0.97, and a wavelength dispersion of 745 nm of 1.01 to 1.05.
Wherein the retardation film has a wavelength dispersion of from 0.98 to 1.01 at 545 nm.
Wherein an angle formed by the slow axis of the retardation film and the transmission axis of the polarizer is 43 to 46 °.
And an angle formed by the slow axis of the retardation film and the transmission axis of the polarizer is 45 °.
Wherein the retardation film is formed of triacetyl cellulose (TAC) or polycarbonate.
And a supporting layer which is laminated on the polarizer and supports the polarizer.
Wherein the support layer is an optical compensation film.
The optical compensation film may be a zero-retardation film, a retardation film in which a positive B plate and a negative B plate are combined, a retardation film in which a positive B plate and a positive C plate are combined, a 1/4 wavelength retardation film, A retardation film combined with a retardation film and a 1/4 wavelength retardation film, a retardation film comprising a protective layer, a 1/2 wavelength liquid crystal coating layer and a 1/4 wavelength liquid crystal coating layer, a 1/2 wavelength retardation film and a 1/4 wavelength retardation film And a retardation film having a protective layer, a half-wavelength liquid crystal coating layer, a quarter-wavelength liquid crystal coating layer, and a C plate combined with each other.
Wherein the retardation film, the polarizer, and the supporting layer are bonded by a roll-to-roll process.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020140048593A KR20150122410A (en) | 2014-04-23 | 2014-04-23 | Polarizing plate and liquid crystal display device comprising the same |
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| KR1020140048593A KR20150122410A (en) | 2014-04-23 | 2014-04-23 | Polarizing plate and liquid crystal display device comprising the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170121789A (en) * | 2016-04-25 | 2017-11-03 | 삼성디스플레이 주식회사 | Display apparatus, phase difference film and manufaturing method thereof |
| KR20190138598A (en) * | 2018-06-05 | 2019-12-13 | 주식회사 엘지화학 | Laminate and liquid crystal display comprising the same |
| KR20190138599A (en) * | 2018-06-05 | 2019-12-13 | 주식회사 엘지화학 | Liquid crystal display |
| KR20220141110A (en) * | 2021-04-12 | 2022-10-19 | 동우 화인켐 주식회사 | Liquid crystal display device |
-
2014
- 2014-04-23 KR KR1020140048593A patent/KR20150122410A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170121789A (en) * | 2016-04-25 | 2017-11-03 | 삼성디스플레이 주식회사 | Display apparatus, phase difference film and manufaturing method thereof |
| KR20190138598A (en) * | 2018-06-05 | 2019-12-13 | 주식회사 엘지화학 | Laminate and liquid crystal display comprising the same |
| KR20190138599A (en) * | 2018-06-05 | 2019-12-13 | 주식회사 엘지화학 | Liquid crystal display |
| US11022845B2 (en) | 2018-06-05 | 2021-06-01 | Lg Chem, Ltd. | Stack and liquid crystal display device including same |
| US11573456B2 (en) | 2018-06-05 | 2023-02-07 | Lg Chem, Ltd. | Liquid crystal display device |
| KR20220141110A (en) * | 2021-04-12 | 2022-10-19 | 동우 화인켐 주식회사 | Liquid crystal display device |
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