CN113625384B - Polarizing plate and optical display device including the same - Google Patents
Polarizing plate and optical display device including the same Download PDFInfo
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- CN113625384B CN113625384B CN202110489918.7A CN202110489918A CN113625384B CN 113625384 B CN113625384 B CN 113625384B CN 202110489918 A CN202110489918 A CN 202110489918A CN 113625384 B CN113625384 B CN 113625384B
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- 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
- G02B5/305—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 including organic materials, e.g. polymeric layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
-
- 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
Abstract
The present invention relates to a polarizing plate and an optical display apparatus including the same. The polarizer includes a polarizer; and a first retardation layer and a second retardation layer sequentially stacked on a lower surface of the polarizer, wherein: the first retardation layer has an in-plane retardation (Re) of 180nm to 240nm at a wavelength of 550 nm; the second retardation layer has an in-plane retardation (Re) of 70nm to 120nm at a wavelength of 550 nm; the polarizer further includes a layer containing a light absorber; and the slow axis of the first retardation layer is inclined at an absolute value of an angle (α1) of 60 ° to 80 ° with respect to the transmission axis of the polarizer, and the slow axis of the second retardation layer is inclined at an absolute value of an angle (α2) of 0 ° to 10 ° with respect to the transmission axis of the polarizer.
Description
Citation of related applications
The present application claims the benefit of korean patent application No. 10-2020-0054124 filed in the korean intellectual property office on 5/6 th year 2020, the entire disclosure of which is incorporated herein by reference.
Technical Field
The present invention relates to a polarizing plate and an optical display apparatus including the same.
Background
The organic light emitting diode display may suffer from deterioration in visibility and contrast due to reflection of external light. In order to solve such a problem, a polarizing plate including a polarizer and a retardation film may be used. The polarizing plate can realize an anti-reflection function by preventing reflected external light from leaking.
The organic light emitting diode display is required to exhibit good screen quality in an operating state while exhibiting good reflection visibility with respect to external light of a side in a non-operating state. The visibility of reflection at the side can be obtained by reducing the side reflectivity. However, the decrease in reflected visibility of the side face may cause deterioration in black visibility due to poor front visibility.
To improve the black visibility of the front side, it is considered to control the color value of the polarizing plate. However, there is a limit to improving the black visibility of the front side by controlling only the color value of the polarizing plate.
The background art of the present invention is disclosed in korean patent laid-open publication No. 10-2013-0103595, etc.
Disclosure of Invention
An object of the present invention is to provide a polarizing plate (polarizing plate) that improves the black visibility of the front face.
It is another object of the present invention to provide a polarizer having low reflectivity on both the front and side.
It is still another object of the present invention to provide a polarizing plate having a circular polarization degree (ellipticity) of 62% or more at the side.
One aspect of the present invention relates to a polarizer.
1. The polarizer includes a polarizer; and a first retardation layer and a second retardation layer sequentially stacked on a lower surface of the polarizer, wherein: the first retardation layer has an in-plane retardation (Re) of 180nm to 240nm at a wavelength of 550 nm; the second retardation layer has an in-plane retardation (Re) of 70nm to 120nm at a wavelength of 550 nm; the polarizer further includes a layer containing a light absorber; and the slow axis of the first retardation layer is inclined at an absolute value of an angle (α1) of 60 ° to 80 ° with respect to the transmission axis of the polarizer, and the slow axis of the second retardation layer is inclined at an absolute value of an angle (α2) of 0 ° to 10 ° with respect to the transmission axis of the polarizer.
2. In 1, the layer containing a light absorber may contain a light absorber having a maximum absorption wavelength of 380nm to 420 nm.
3. In 2, the light absorber may be present in the layer containing the light absorber in an amount of 0.1wt% to 6 wt%.
4. In 2, the light absorber may include at least one selected from the group consisting of indole, phenylbenzotriazole and triazine light absorbers.
5. In 1 to 4, each of the first retardation layer and the second retardation layer may exhibit positive wavelength dispersion.
6. In 1 to 5, the laminate (laminate) of the first and second retardation layers may have an in-plane retardation (Re) of 120nm to 200nm at a wavelength of 550 nm.
7. In 1 to 6, the first retardation layer may have a positive out-of-plane retardation (Rth) at a wavelength of 550nm, and the second retardation layer may have a negative out-of-plane retardation (Rth) at a wavelength of 550 nm.
8. In 1 to 7, the first retarder layer may have a positive biaxial degree (NZ) at a wavelength of 550nm, and the second retarder layer may have a negative biaxial degree at a wavelength of 550 nm.
9. In 1 to 8, an angle defined between the slow axis of the first retardation layer and the slow axis of the second retardation layer may be in a range of 50 ° to 70 °.
10. In 1 to 9, the angle α1 may be in the range of +60° to +80° and the angle α2 may be in the range of 0 ° to +10°, or the angle α1 may be in the range of-80 ° to-60 ° and the angle α2 may be in the range of-10 ° to 0 °.
11. In 1 to 10, a layer including a light absorber may be formed on a lower surface of the second retardation layer, between the first retardation layer and the second retardation layer, between the polarizer and the first retardation layer, and/or on an upper surface of the polarizer.
12. In 1 to 11, the second retardation layer may include at least one selected from cellulose ester polymers and polystyrene polymers.
13. In 1 to 12, the polarizing plate may further include a protective film formed on an upper surface of the polarizer.
14. In 1 to 13, the polarizing plate may further include a positive C layer. .
Another aspect of the invention relates to an optical display device.
The optical display device may comprise a polarizer according to the present invention.
The present invention provides a polarizing plate that improves the black visibility of the front face.
The present invention provides a polarizing plate having low reflectivity on both the front and side surfaces.
The present invention provides a polarizing plate having a circular polarization degree (ellipticity) of 62% or more at the side.
Drawings
Fig. 1 is a cross-sectional view of a polarizer according to one embodiment of the present invention.
Fig. 2 is a diagram showing an arrangement relationship among a transmission axis of a polarizer, a slow axis of a first retardation layer, and a slow axis of a second retardation layer in the polarizing plate of the embodiment of the present invention.
Fig. 3 is a cross-sectional view of a polarizing plate according to another embodiment of the present invention.
Fig. 4 is a diagram showing color values a and b.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments will be described in detail with reference to the drawings to provide those skilled in the art with a thorough understanding of the present invention. In the drawings, for clarity of description of the present invention, components irrelevant to the description are omitted, and like components will be denoted by like reference numerals throughout the specification. Although the length, thickness or width of the various components may be exaggerated for the purpose of understanding of the drawings, the present invention is not limited thereto.
Spatially relative terms, such as "upper" and "lower", are defined herein with reference to the figures. Thus, it will be understood that the term "upper surface" may be used interchangeably with the term "lower surface".
Herein, "in-plane retardation Re", "out-of-plane retardation Rth", and "biaxial NZ" are represented by equations A, B and C, respectively:
[ equation A ]
Re＝(nx-ny)×d
[ equation B ]
Rth＝((nx+ny)/2-nz)×d
[ equation C ]
NZ＝(nx-nz)/(nx-ny)。
Where nx, ny, and nz are refractive indices of the respective optical devices in the slow axis direction, the fast axis direction, and the thickness direction at the measurement wavelength, respectively, and d is the thickness (unit: nm) of the optical device. In equations A through C, the measurement wavelength may be 450nm, 550nm, or 650nm.
Herein, "short wavelength dispersion" refers to Re (450)/Re (550), and "long wavelength dispersion" refers to Re (650)/Re (550), wherein Re (450), re (550), and Re (650) refer to in-plane retardation (Re) of a single retardation layer or laminate of retardation layers at wavelengths of about 450nm, 550nm, and 650nm, respectively.
As used herein to denote an angle, "+" denotes a counterclockwise direction about a reference point, and "-" denotes a clockwise direction about a reference point.
Herein, the term "(meth) acrylic" refers to acrylic and/or methacrylic.
As used herein to refer to a particular numerical range, the expression "X to Y" means "greater than or equal to X and less than or equal to Y (X. Ltoreq. And. Ltoreq. Y)".
The polarizing plate generally deteriorates the black visibility of the front surface due to the decrease in visual sensitivity of the side reflection. The present inventors have developed a polarizing plate that can achieve low reflectance at the front and side surfaces while improving not only the reflected visual sensitivity of the side surfaces but also the black visibility of the front surface. Herein, it is assumed that the front face is represented by 0 °, the "side" face, i.e., each of the right side and the left side, means a direction in the range of 45 ° to 75 °, particularly in the direction of 60 °.
In one embodiment, the polarizer may have color values a and b satisfying the following relationship: when the black visibility of the front face is evaluated by the color values a and b, 0+|b|2.5. Within this range, the polarizing plate can improve the black visibility of the front face. Preferably, the polarizer has a color value a of-2.5 to 2.5 and a color value b of-2.5 to 2.5. The determination of a and b can be performed by the methods described in the examples. Relationship: 0 < a > +|b < 2.5 is set as an evaluation criterion, indicating that the polarizer improves the black visibility of the front face when actually mounted on the module of the optical display device. Fig. 4 shows color values a (corresponding to the x-axis) and b (corresponding to the y-axis). The polarizing plate according to the present invention may have color values a and b satisfying |a|+|b| in the range of 0 to 2.5. For example, a polarizer color value a and b satisfying |a|+|b| is 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, or 2.5.
For example, the polarizer may have a color value a of-2.5, -2.4, -2.3, -2.2, -2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, -1.2, -1.1, -1.0, -0.9, -0.8, -0.7, -0.6, -0.5, -0.4, -0.3, -0.2, -0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2.2, 2.2, 2.3, 2.4 or 2.5.
For example, the polarizer may have a color value b of-2.5, -2.4, -2.3, -2.2, -2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, -1.2, -1.1, -1.0, -0.9, -0.8, -0.7, -0.6, -0.5, -0.4, -0.3, -0.2, -0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2.2, 2.2, 2.3, 2.4 or 2.5.
In one embodiment, the polarizer may have a front side reflectance of 1.0% or less, preferably 0.5% or less, and a side reflectance of 2.0% or less, preferably 1.5% or less when applied to an optical display device. Within this range, the polarizer may improve front and side screen quality.
For example, when applied to an optical display device, the polarizer may have a front side reflectance of 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0%, and a side reflectance of 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0%.
In one embodiment, the minimum side ellipticity (circular polarization degree) of the polarizer is 62% or more, for example, 62% to 80% when applied to an optical display device. Within this range, the polarizer can improve screen quality (minimize color variation at 60 ° sides and 0 ° to 360 ° azimuth angles). For example, the minimum side ellipticity of the polarizer is 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, or 80%.
According to the present invention, a polarizing plate includes a polarizer; and a first retardation layer and a second retardation layer sequentially stacked on a lower surface of the polarizer, wherein: the first retardation layer has an in-plane retardation (Re) of 180nm to 240nm at a wavelength of 550 nm; the second retardation layer has an in-plane retardation (Re) of 70nm to 120nm at a wavelength of 550 nm; the polarizer further includes a layer containing a light absorber; and the slow axis of the first retardation layer is inclined at an absolute value of an angle of 60 ° to 80 ° with respect to the transmission axis of the polarizer, and the slow axis of the second retardation layer is inclined at an absolute value of an angle of 0 ° to 10 ° with respect to the transmission axis of the polarizer.
Next, a polarizing plate according to an embodiment of the present invention will be described with reference to fig. 1.
Referring to fig. 1, the polarizer includes a polarizer 110; a protective film 150 laminated on the upper surface of the polarizer 110; and a first retardation layer 120, a second retardation layer 130, and a layer 140 containing a light absorber, which are sequentially laminated on the lower surface of the polarizer 110 in the above order.
First delay layer
The first retardation layer 120 has an in-plane retardation (Re) of 180nm to 240nm at a wavelength of 550 nm. In a typical polarizer, a 1/2 in-plane retardation layer and a 1/4 in-plane retardation layer are sequentially laminated on the lower surface of the polarizer to reduce the reflectivity of the front and side surfaces. In the polarizing plate according to the present invention, the first retardation layer has an in-plane retardation of 180nm to 240nm at a wavelength of 550nm, which is significantly different from a 1/2 phase difference of 260nm to 280 nm. By this structure, in combination with the second retardation layer having the above-described in-plane retardation at a wavelength of 550nm and the light absorber-containing layer, the first retardation layer can significantly reduce the front and side reflectivities while ensuring an ellipticity (circular polarization degree) of 62% or more, and color values a and b satisfying the following relationship: 0 < a > ++ b > < 2.5.
Preferably, the first retardation layer 120 has an in-plane retardation (Re) of 180nm to 240nm at a wavelength of 550 nm. For example, at a wavelength of 550nm, the first retardation layer 120 may have an in-plane retardation (Re) of 180nm, 181nm, 182nm, 183nm, 184nm, 185nm, 186nm, 187nm, 188nm, 189nm, 190nm, 191nm, 192nm, 193nm, 194nm, 195nm, 196nm, 197nm, 198nm, 199nm, 200nm, 201nm, 202nm, 203nm, 204nm, 205nm, 206nm, 207nm, 208nm, 209nm, 210nm, 211nm, 212nm, 213nm, 214nm, 215nm, 216nm, 217nm, 218nm, 219nm, 220nm, 221nm, 222nm, 223nm, 224nm, 225nm, 226nm, 227nm, 228nm, 229nm, 230nm, 231nm, 232nm, 233nm, 234nm, 235nm, 236nm, 237nm, 238nm, 239nm, or 240 nm.
The first retardation layer 120 exhibits positive wavelength dispersion and may have a short wavelength dispersion of 1 to 1.1 and a long wavelength dispersion of 0.96 to 1. Within this range, the polarizer may reduce front and side reflectivity in use while increasing ellipticity. Preferably, the first retardation layer has a short wavelength dispersion of 1.03 to 1, and a long wavelength dispersion of 0.98 to 1, 0.99 to 1, or 0.995 to 1.
In one embodiment, the first retardation layer 120 may have an in-plane retardation (Re) of 180nm to 280nm, preferably 185nm to 260nm, more preferably 190nm to 250nm at a wavelength of 450nm, and an in-plane retardation (Re) of 175nm to 270nm, preferably 180nm to 255nm, more preferably 185nm to 240nm at a wavelength of 650 nm. Within this range, the first retardation layer can easily realize short wavelength dispersion and long wavelength dispersion.
The first retardation layer 120 may have a positive out-of-plane retardation (Rth) at a wavelength of 550nm, for example, an out-of-plane retardation (Rth) of 95nm to 200nm, preferably 105nm to 180 nm. Within this range, the polarizer can improve side reflectance.
The first retardation layer 120 may have a positive biaxial degree at a wavelength of 550nm, for example, 1 to 1.3, preferably 1.1 to 1.3. Within this range, the polarizer can improve side reflectance. For example, the first retardation layer 120 may have a positive biaxial degree of 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, or 1.3.
The first retardation layer 120 may be a non-liquid crystal layer, and may include a film formed of an optically transparent resin. The "non-liquid crystal layer" may refer to a layer formed not of at least one selected from the group consisting of a liquid crystal monomer, a liquid crystal oligomer, and a liquid crystal polymer, or a layer formed of a material that is not converted into a liquid crystal monomer, a liquid crystal oligomer, or a liquid crystal polymer by light irradiation.
For example, the first retardation layer 120 may be formed of at least one resin selected from cellulose resins including triacetyl cellulose (TAC) and the like, including polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate (PEN), polybutylene naphthalate and the like, cyclic polyolefin (COP) resins, polycarbonate resins, polyethersulfone resins, polysulfone resins, polyamide resins, polyimide resins, polyolefin resins, polyarylate resins, polyvinyl alcohol resins, polyvinyl chloride resins, and polyvinylidene chloride resins. Preferably, in order to ensure short wavelength dispersion and long wavelength dispersion, the first retardation layer 120 may include a cyclic polyolefin film. In the polarizing plate, the cyclic polyolefin film may provide an effect of improving the front surface reflectance.
The first retardation layer 120 may have a thickness of 10 μm to 60 μm, specifically 20 μm to 50 μm. Within this range, the first retardation layer 120 may be used in a polarizer.
The first retardation layer 120 may be formed by stretching a non-stretched film formed of an optically transparent resin, or may be stacked on a polarizer by a roll-to-roll process to manufacture a polarizer, thereby improving workability.
In one embodiment, the first retardation layer 120 is formed of an obliquely stretched film stretched in an oblique direction at a predetermined angle with respect to the machine direction of the film in a non-stretched state, and may secure a slow axis oblique with respect to the machine direction of the film. The process of obliquely stretching the film may be carried out by typical methods known to those skilled in the art.
For the first retardation layer formed of the obliquely stretched film, the slow axis of the first retardation layer may be inclined at a predetermined angle with respect to the transmission axis of the polarizer, so that the polarizer may reduce front and side reflectivities while improving ellipticity at the side, and may have color values a and b satisfying the following relationship: 0 < a > +|b > < 2.5 to improve the black visibility of the front face.
Referring to fig. 2, the slow axis 120a of the first retardation layer 120 is inclined at an absolute value of an angle α1 of 60 ° to 80 ° with respect to the transmission axis 110a of the polarizer 110. Within this range, an angle defined between the slow axis of the first retardation layer and the slow axis of the second retardation layer may be within a preset range, so that the polarizer may reduce front and side reflectivities. Preferably, the absolute value of the angle α1 is in the range of 62 ° to 75 °, more preferably in the range of 64 ° to 73 °. For example, the absolute value of the angle α1 may be 60 °, 61 °, 62 °, 63 °, 64 °, 65 °, 66 °, 67 °, 68 °, 69 °, 70 °, 71 °, 72 °, 73 °, 74 °, 75 °, 76 °, 77 °, 78 °, 79 °, or 80 °.
Although not shown in fig. 1, the first retardation layer 120 may be bonded to the polarizer 110 via a first adhesive layer. The first adhesive layer may be formed of, for example, a water-based adhesive and/or a photocurable adhesive. Preferably, the first adhesive layer is formed of a photocurable adhesive, whereby the adhesion between the protective film and the polarizer and the adhesion between the polarizer and the first retardation layer can be achieved by one light irradiation, thereby improving the processability of the polarizer.
Second delay layer
The second retardation layer 130 has an in-plane retardation (Re) of 70nm to 120nm at a wavelength of 550 nm. In a typical polarizer, a 1/2 in-plane retardation layer and a 1/4 in-plane retardation layer are stacked in order on the lower surface of the polarizer in order to reduce front and side reflectivities. In the polarizing plate according to the present invention, the second retardation layer has an in-plane retardation of 70nm to 120nm at a wavelength of 550nm, which is significantly different from a 1/4 phase difference of 130nm to 150 nm. By this structure, in combination with the first retardation layer and the light absorber-containing layer, the second retardation layer can significantly reduce front-side and side-side reflectivities, particularly at the side of 60 °, while ensuring an ellipticity (circular polarization degree) of 62% or more of the side, and color values a and b satisfying the following relationship: 0 < a > ++ b > < 2.5.
Preferably, the second retardation layer 130 may have an in-plane retardation (Re) of 85nm to 115nm, particularly 90nm to 110nm, at a wavelength of 550 nm. For example, at a wavelength of 550nm, the second retardation layer 130 may have an in-plane retardation (Re) of 70nm, 71nm, 72nm, 73nm, 74nm, 75nm, 76nm, 77nm, 78nm, 79nm, 80nm, 81nm, 82nm, 83nm, 84nm, 85nm, 86nm, 87nm, 88nm, 89nm, 90nm, 91nm, 92nm, 93nm, 94nm, 95nm, 96nm, 97nm, 98nm, 99nm, 100nm, 101nm, 102nm, 103nm, 104nm, 105nm, 106nm, 107nm, 108nm, 109nm, 110nm, 111nm, 112nm, 113nm, 114nm, 115nm, 116nm, 117nm, 118nm, 119nm, or 120 nm.
The second retarder 130 is formed on a lower surface of the first retarder 120. In the laminate in which the polarizer 110, the second retardation layer 130, and the first retardation layer 120 are sequentially laminated in the above order, the polarizing plate according to the present invention cannot effectively achieve the effects of the present invention, and particularly cannot satisfy 0.ltoreq.a.ltoreq.b.ltoreq.2.5.
The second delay layer 130 exhibits positive wavelength dispersion and may have a short wavelength dispersion of 1 to 1.15 and a long wavelength dispersion of 0.94 to 1. Within this range, the difference in wavelength dispersion between the first retardation layer and the second retardation layer can be reduced to increase the ellipticity at each wavelength, thereby increasing the reflectivity. Preferably, the second retardation layer has a short wavelength dispersion of 1 to 1.06 and a long wavelength dispersion of 0.97 to 1.
For example, the second delay layer 130 may have a short wavelength dispersion of 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, or 1.15, and a long wavelength dispersion of 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, or 1.
In one embodiment, the second retardation layer 130 may have an in-plane retardation (Re) of 80nm to 120nm, preferably 85nm to 115nm, more preferably 90nm to 110nm at a wavelength of 450nm, and an in-plane retardation (Re) of 80nm to 110nm, preferably 85nm to 105nm at a wavelength of 650 nm. Within this range, the second retardation layer can easily realize short wavelength dispersion and long wavelength dispersion.
The second retardation layer 130 may have a negative out-of-plane retardation (Rth) of, for example, -250nm to-50 nm, preferably, -150nm to-60 nm, at a wavelength of 550 nm. Within this range, the polarizing plate can improve side reflectance by improving the degree of circular polarization with respect to the side.
The second retardation layer 130 may have a negative biaxial degree of, for example, -2 to-0.1, preferably, -1.5 to-0.1, more preferably, -0.5 to-0.1, at a wavelength of 550 nm. Within this range, the polarizer can improve side reflectance. Within this range, the polarizing plate can improve side reflectance by improving the degree of circular polarization at the side.
The second retardation layer 130 may have a refractive index of 1.4 to 1.6, preferably 1.5 to 1.6. Within this range, the transparency of the polarizing plate can be improved by controlling the refractive index as compared with the first retardation layer.
The second retardation layer 130 is formed of a composition for the second retardation layer described below. Here, the second retardation layer may be formed such that by controlling the coating direction and/or the coating method, the slow axis of the second retardation layer may be inclined at an angle within a predetermined range with respect to the transmission axis of the polarizer, so that the polarizing plate may reduce front and side reflectivities while improving side ellipticity, and may realize color values a and b satisfying the following relationship: 0 < a > +|b > < 2.5 to improve the black visibility of the front face.
Referring to fig. 2, the slow axis 130a of the second retardation layer 130 is inclined at an absolute value of an angle α2 of 0 ° to 10 ° with respect to the transmission axis 110a of the polarizer 110. Within this range, an angle defined between the slow axis of the first retardation layer 120 and the slow axis of the second retardation layer may be within a preset range, so that the polarizer may reduce front and side reflectivities. Preferably, the absolute value of the angle α2 is in the range of 6 ° to 8 °. For example, the absolute value of the angle α2 may be 0 °, 1 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, 8 °, 9 °, or 10 °.
In one embodiment, the angle α1 may be in the range of +60° to +80°, and the angle α2 may be in the range of 0 ° to +10°. In another embodiment, the angle α1 may be in the range of-80 ° to-60 °, and the angle α2 may be in the range of-10 ° to 0 °.
For example, the angle α1 may be +60°, +61°, +62°, +63°, +64°, +65°, +66°, +67°, +68°, +69°, +70°, +71°, +72°, +73°, +74°, +75°, +76°, +77°, +78°, +79° or +80°, and the angle α2 may be 0 °, +1°, +2°, +3°, +4°, +5°, +6°, +7°, +8°, +9° or +10°.
For example, the angle α1 may be-80 °, -79 °, -78 °, -77 °, -76 °, -75 °, -74 °, -73 °, -72 °, -71 °, -70 °, -69 °, -68 °, -67 °, -66 °, -65 °, -64 °, -63 °, -62 °, -61 °, or-60 °, and the angle α2 may be-10 °, -9 °, -8 °, -7 °, -6 °, -5 °, -4 °, -3 °, -2 °, -1 °, or 0 °.
In one embodiment, referring to fig. 2, the angle defined between the slow axis 120a of the first retardation layer 120 and the slow axis 130a of the second retardation layer 130 may be in the range of 50 ° to 70 °, preferably 57 ° to 70 °, more preferably 57 ° to 67 °. Within this range, the polarizing plate may have a high degree of circular polarization. For example, the angle defined between the slow axis 120a of the first delay layer 120 and the slow axis 130a of the second delay layer 130 may be 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, 61 °, 62 °, 63 °, 64 °, 65 °, 66 °, 67 °, 68 °, 69 °, or 70 °.
The second retardation layer 130 may have a thickness of 1 μm to 10 μm, preferably 2 μm to 8 μm. Within this range, the second retardation layer can effectively exhibit good out-of-plane retardation (Rth) over its entire width, and the thickness of the polarizing plate can be reduced.
In order to ensure the above-described in-plane retardation at a wavelength of 550nm, the second retardation layer 130 may include a coating layer formed of a composition for the second retardation layer described below as a non-liquid crystal layer.
Hereinafter, a composition for the second retardation layer will be described.
The second retardation layer may be a non-liquid crystal layer. For the second retardation layer including liquid crystal, an alignment film for aligning the liquid crystal at an angle must be provided to the polarizing plate, thereby causing generation of impurities.
In one embodiment, the composition for the second retardation layer is a non-liquid crystal composition and includes at least one selected from the group consisting of cellulose ester polymers and polystyrene polymers.
Next, the cellulose ester polymer will be described.
Herein, "polymer" refers to an oligomer, polymer, or resin.
The cellulose ester polymer may include an ester polymer having acyl units in which at least some of the hydroxyl groups [ C ] of the sugar monomers comprising the cellulose 2 Hydroxy, C 3 Hydroxy or C 6 Hydroxy group]Is unsubstituted or substituted, as shown in formula 1:
[ 1]
Wherein n is an integer of 1 or more.
Substituents of the cellulose ester polymer or acyl unit may include substituents selected from halogen atoms, nitro groups, alkyl groups (e.g., C 1 To C 20 Alkyl), alkenyl (e.g., C 2 To C 20 Alkenyl), cycloalkyl (e.g., C 3 To C 10 Cycloalkyl), aryl (e.g., C 6 To C 20 Aryl), heteroaryl (e.g., C 3 To C 10 Aryl), alkoxy (e.g., C 1 To C 20 Alkoxy), acyl, and halogen-containing functional groups. The substituents may be the same or different from each other.
Herein, the term "acyl" may denote R-C (=o) - (. Is a linking site, R is C) 1 To C 20 Alkyl, C 3 To C 20 Cycloalkyl, C 6 To C 20 Aryl or C 7 To C 20 Arylalkyl), as is well known in the art. "acyl" groups are coupled to the cellulose ring through ester bonds (through oxygen atoms) in the cellulose.
Herein, for convenience, "alkyl", "alkenyl", "cycloalkyl", "aryl", "heteroaryl", "alkoxy" and "acyl" refer to non-halogen based compounds. The composition for the second retardation layer may comprise only the cellulose ester polymer or a mixture comprising the cellulose ester polymer.
Here, "halogen" means fluorine (F), cl, br or I, preferably F.
"halogen-containing functional groups" are organic functional groups containing at least one halogen atom and may include aromatic, aliphatic, or cycloaliphatic functional groups. For example, a halogen-containing functional group may refer to a halogen-substituted C 1 To C 20 Alkyl, halogen substituted C 2 To C 20 Alkenyl, halogen substituted C 2 To C 20 Alkynyl, halogen substituted C 3 To C 10 Cycloalkyl, halogen substituted C 1 To C 20 Alkoxy, halogen-substituted acyl, halogen-substituted C 6 To C 20 Aryl-or halogen-substituted C 7 To C 20 Arylalkyl groups, but are not limited thereto.
"halo-substituted acyl" may be R '-C (=o) - ("connecting site" R' is halo-substituted C) 1 To C 20 Alkyl, halogen substituted C 3 To C 20 Cycloalkyl, halogen substituted C 6 To C 20 Aryl-or halogen-substituted C 7 To C 20 Arylalkyl). "halo-substituted acyl" groups may be coupled to the cellulose ring through ester bonds (through oxygen atoms) in the cellulose.
Preferably, the composition for the second retardation layer may include a cellulose ester polymer substituted with an acyl group, a halogen, or a halogen-containing functional group. More preferably, the halogen may be fluorine. The halogen may be present in the cellulose ester polymer in an amount of 1wt% to 10 wt%. Within this range, the composition makes it easy to form the second retardation layer having the properties of the present invention, and the degree of circular polarization (ellipticity) can be improved. For example, halogen may be present in the cellulose ester polymer in an amount of 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, or 10 wt%.
To form the second retardation layer, the cellulose ester polymer may be prepared by typical methods known to those skilled in the art, or may be obtained from a commercially available product. For example, a cellulose ester polymer having an acyl group as a substituent may be prepared by reacting trifluoroacetic acid or trifluoroacetic anhydride with a sugar monomer or a polymer of sugar monomers constituting a cellulose represented by formula 1, by reacting trifluoroacetic acid or trifluoroacetic anhydride with it, and then reacting an acylating agent (e.g., a carboxylic anhydride or a carboxylic acid) with it in addition, or by reacting trifluoroacetic acid or trifluoroacetic anhydride and an acylating agent with both.
The polystyrene polymer may include a moiety represented by formula 2:
[ 2]
Wherein R is 1 、R 2 And R is 3 Each independently is a hydrogen atom, an alkyl group, a substituted alkyl group, or a halogen; rs are each independently substituents on the styrene ring; and n is an integer of 0 to 5 representing the number of substituents on the styrene ring.
Examples of the substituent R on the styrene ring may include an alkyl group, a substituted alkyl group, a halogen atom, a hydroxyl group, a carboxyl group, a nitro group, an alkoxy group, an amino group, a sulfonate group, a phosphate group, an acyl group, an acyloxy group, a phenyl group, an alkoxycarbonyl group, and a cyano group.
In one embodiment, R 1 、R 2 And R is 3 At least one of which is halogen, preferably fluorine.
The composition for the second retarder layer may further comprise an additive comprising aromatic fused rings. Additives containing aromatic fused rings are used to adjust wavelength dispersion. Examples of the additive containing an aromatic condensed ring may include 2-naphthyl benzoate, anthracene, phenanthrene, 2, 6-naphthalene dicarboxylic acid diester, and the like. The additive containing aromatic fused rings may be present in the composition for the second retarder layer in an amount of 0.1wt% to 30wt%, preferably 1wt% to 10 wt%. Within this range, the additive containing an aromatic condensed ring can adjust retardation and wavelength dispersion. For example, the aromatic fused ring-containing additive may be present in the composition for the second retarder layer in an amount of 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt% or 30 wt%.
The composition for the second retarder layer may further comprise typical additives known to those skilled in the art. Additives may include pigments and antioxidants, but are not limited thereto.
Although not shown in fig. 2, an adhesive layer or a bonding layer is formed on the lower surface of the second retardation layer 130 so that the polarizing plate is stacked on a device of the optical display apparatus, for example, a light emitting diode panel.
Laminate of a first retarder layer and a second retarder layer
The laminate of the first retarder layer and the second retarder layer may have an in-plane retardation (Re) of 120nm to 200nm, preferably 140nm to 180nm, at a wavelength of 550 nm. Within this range, the polarizer can reduce reflectance while improving circular polarization. For example, at a wavelength of 550nm, the laminate of the first retarder layer and the second retarder layer may have an in-plane retardation (Re) of 120nm, 125nm, 130nm, 135nm, 140nm, 145nm, 150nm, 155nm, 160nm, 165nm, 170nm, 175nm, 180nm, 185nm, 190nm, 195nm or 200 nm.
The laminate of the first retarder layer and the second retarder layer may be formed by coating a composition for the second retarder layer on the first retarder layer and then performing oblique stretching with reference to the MD of the first retarder layer. Specifically, the laminate of the first retardation layer and the second retardation layer may be formed by coating the composition for the second retardation layer on the first retardation layer or the non-stretched or obliquely stretched film for the first retardation layer in a non-stretched or obliquely stretched state, and then obliquely stretching in the MD direction or the oblique direction with respect to the MD of the first retardation layer or the film for the first retardation layer. Preferably, the first retardation layer and the second retardation layer realize a retardation difference between the first retardation layer and the second retardation layer in the polarizing plate according to the present invention by oblique stretching in an oblique direction with respect to the MD of the first retardation layer or the film for the first retardation layer.
Polarizer
The polarizer 110 serves to convert natural light or polarized light into polarized light by linear polarization in a specific direction, and may be made of a polymer film substantially containing polyvinyl alcohol resin. Specifically, the polarizer 130 may be prepared by dyeing a polymer film with iodine or a dichroic dye, and then stretching the film in MD. In particular, polarizers can be produced by swelling, dyeing, stretching and crosslinking.
Polarizer 110 may have a total light transmittance of 40% or more, e.g., 40% to 47%, and a degree of polarization of 99% or more, e.g., 99% to 100%. Within this range, the polarizer can improve the antireflection performance of the polarizer by combining with the first retardation layer and the second retardation layer.
Polarizer 110 may have a thickness of 2 μm to 30 μm, specifically 4 μm to 25 μm. Within this range, a polarizer may be used in the polarizing plate.
ContainingHas the following componentsLayer of light absorber
The layer containing a light absorber contains a light absorber having a maximum absorption wavelength of 380nm to 420 nm. When the first retardation layer and the second retardation layer are laminated in the polarizing plate according to the present invention, the light absorber can help to improve the black visibility of the front surface. Herein, "maximum absorption wavelength" refers to a wavelength at which absorbance reaches a maximum when measured in a light absorber solution diluted to a concentration of 10mg/L in chloroform. Preferably, the layer containing the light absorber may have a maximum absorption wavelength of 380nm to 400nm, more preferably 390nm to 400 nm. For example, the layer containing the light absorber may have a maximum absorption wavelength of 380nm, 385nm, 390nm, 395nm, 400nm, 405nm, 410nm, 415nm, or 420 nm.
In one embodiment, the layer containing the light absorber may have a light transmittance of 10% or less, for example 5% or less, at a wavelength of 380 to 420 nm. Within this range, the polarizing plate can improve the visual sensitivity of the front reflection. For example, the layer containing the light absorber may have a light transmittance of 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%.
The light absorber may be selected from any light absorbers as long as the light absorber can achieve the above maximum absorption wavelength. In particular, the light absorber may include at least one selected from the group consisting of indole, phenylbenzotriazole, and triazine light absorbers. In the polarizing plate according to the present invention, these light absorbers can improve the black visibility of the front surface.
The light absorber may be present in the layer containing the light absorber in an amount of 0.1wt% to 6wt%, for example 0.3wt% to 5 wt%. Within this range, the light absorber can improve the black visibility and reliability of the front surface without oozing out or affecting the retardation values of the first retardation layer and the second retardation layer. For example, the light absorber may be present in an amount of 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 2%, 3%, 4%, 5% or 6% by weight.
The light absorber-containing layer may be an adhesive layer or a non-adhesive layer depending on the kind of base resin forming the light absorber-containing layer. In one embodiment, the layer containing the light absorber may be an adhesive layer by which the polarizing plate according to the present invention may be attached to a panel or the like.
The layer containing the light absorber may have a thickness of 1 μm to 20 μm, in particular 5 μm to 1.5 μm. Within this range, a layer containing a light absorber may be used in the polarizing plate.
Fig. 1 shows a polarizer in which a layer 140 containing a light absorber is formed on the lower surface of the second retardation layer 130. Alternatively, the layer 140 containing the light absorber may be formed between the first retardation layer 120 and the second retardation layer 130, between the polarizer 110 and the first retardation layer 120, and/or between the protective film 150 and the polarizer 110.
Protective film
The protective film 150 is formed on the upper surface of the polarizer 110 to protect the polarizer from the external environment while improving the mechanical strength of the polarizer.
The protective film 150 is for protecting the polarizer from the external environment, and may be an optically transparent film formed of, for example, at least one resin selected from cellulose resins including triacetyl cellulose (TAC) and the like, including polyester resins including polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate (PEN), polybutylene naphthalate and the like, cyclic polyolefin (COP) resins, polycarbonate resins, polyethersulfone resins, polysulfone resins, polyamide resins, polyimide resins, polyolefin resins, polyarylate resins, polyvinyl alcohol resins, polyvinyl chloride resins, and polyvinylidene chloride resins. Specifically, the protective film may be a TAC film or a PET film.
The protective film 150 may have a thickness of 5 μm to 70 μm, specifically 15 μm to 45 μm. Within this range, a protective film may be used in the polarizing plate.
Although not shown in fig. 1, a functional coating layer may be further formed on the upper surface of the protective film 150 to provide additional functions to the polarizer. For example, the functional coating may include a hard coating, an anti-fingerprint layer, and an anti-reflection layer. These functional coatings may be stacked individually or in combination.
Although not shown in fig. 1, the protective film 150 may be bonded to the polarizer 110 via a second adhesive layer. The second adhesive layer may be formed of at least one selected from a water-based adhesive and a photocurable adhesive. Preferably, the second adhesive layer is formed of a photocurable adhesive, whereby the adhesion between the protective film and the polarizer and the adhesion between the polarizer and the first retardation layer can be achieved by one light irradiation, thereby improving the processability of the polarizer.
The second adhesive layer may have a thickness of 0.1 μm to 10 μm, specifically 0.5 μm to 5 μm. Within this range, a second adhesive layer may be used in the polarizing plate.
Next, a polarizing plate according to another embodiment of the present invention will be described.
In the polarizing plate according to the present embodiment, the protective film, the polarizer, the first retardation layer, the second retardation layer, and the layer containing the light absorber may be sequentially stacked in this order, and a primer layer may be further formed on the lower surface of the first retardation layer. The primer layer is formed directly on the first and second retarder layers. The primer layer directly formed on the lower surface of the first retarder layer makes the second retarder layer exhibit high adhesion to the first retarder layer and can prevent the first retarder layer from being blocked in a roll-to-roll process, thereby facilitating the formation of a laminate of the first retarder layer and the second retarder layer. In particular, when the first retardation layer is a cyclic polyolefin film that can be blocked, making it difficult to form a second retardation layer thereon by a roll-to-roll process, the workability of forming a primer layer on the first retardation layer when forming the second retardation layer may be improved.
Now, the primer layer will be described in detail.
In one embodiment, the primer layer may comprise particles. Adjusting the size of the particles in the primer layer may improve the adhesion of the second retarder layer to the first retarder layer and workability in forming the laminate of the first retarder layer and the second retarder layer. In one embodiment, the average particle size (D50) of the particles is less than the thickness of the primer layer, and may be in the range of, for example, 1nm to 500nm, preferably 100nm to 300 nm. Within this range, the primer layer may prevent the first retardation layer from being blocked and may improve the adhesion of the second retardation layer to the first retardation layer. The particles may have a spherical or non-spherical shape, but are not limited thereto. Preferably, the particles have a spherical shape. The particles may comprise a material selected from the group consisting of silica (e.g., silicon dioxide) and titania (e.g., tiO 2 ) But not limited to, at least one of the above.
The particles may be present in the primer layer in an amount of 10wt% to 50wt%, specifically 10wt% to 30 wt%. Within this range, the primer layer may prevent the first retarder layer from being blocked when the first retarder layer is wound onto the roll, and may improve adhesion between the first retarder layer and the second retarder layer. For example, the particles may be present in the primer layer in an amount of 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, 31wt%, 32wt%, 33wt%, 34wt%, 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, 40wt%, 41wt%, 42wt%, 43wt%, 44wt%, 45wt%, 46wt%, 47wt%, 48wt%, 49wt%, or 50 wt%.
The primer layer may be formed by coating a composition including particles and a curable resin, and then curing. The curable resin may include at least one selected from thermosetting resins and photocurable resins, but is not limited thereto. For example, the curable resin may include modified or unmodified olefin resins such as acrylic, ethylene, and propylene resins, but is not limited thereto.
The primer layer may have a thickness of 100nm to 500nm, in particular 150nm to 300nm, which is greater than the average particle diameter of the particles. Within this range, the primer layer may prevent blocking of the first retardation layer, may increase adhesion of the second retardation layer, and may reduce the thickness of the polarizing plate.
In another embodiment, the primer layer may be formed by coating a composition comprising a particle-free curable resin and then curing.
In further embodiments, the polarizer may further include a third retardation layer.
Next, a polarizing plate according to another embodiment of the present invention will be described with reference to fig. 3.
Referring to fig. 3, the polarizer includes a protective film 140, a polarizer 110, a third retardation layer 160, a first retardation layer 120, and a second retardation layer 130. The polarizing plate according to this embodiment is substantially the same as the polarizing plate shown in fig. 1, except that a third retarder layer 160 is additionally formed between the polarizer 110 and the first retarder layer 120.
By the structure in which the third retardation layer 160 is additionally formed between the polarizer 110 and the first retardation layer 120, the reflectivity of the polarizer at the side can be further improved.
The third retarder layer may include a positive C retarder layer satisfying the relationship: nz > nx ∈ ny (nx, ny, and nz are refractive indices of the third retardation layer in the slow direction, the fast direction, and the thickness direction thereof, respectively, at a wavelength of 550 nm).
In one embodiment, the third retardation layer may have an out-of-plane retardation (Rth) of-300 nm to 0nm, e.g., -200nm to-30 nm, at a wavelength of 550 nm. The third retardation layer may have an in-plane retardation (Re) of 0nm to 10nm, for example 0nm to 5nm, at a wavelength of 550 nm. Within this range, the polarizer can achieve a reduction in the reflectance of the front surface.
In one embodiment, the third retardation layer 160 may be a liquid crystal layer. The liquid crystal layer may be formed of a known typical material that realizes the above out-of-plane retardation (Rth).
In another embodiment, the third retarder layer 160 may be formed of the composition for the second retarder layer described above.
The optical display device according to the present invention may include a polarizing plate according to an embodiment of the present invention. For example, the optical display device may include an Organic Light Emitting Diode (OLED) display and a liquid crystal display.
In one embodiment, an OLED display device may include: an OLED panel including a flexible substrate; and a polarizer according to the present invention stacked on the OLED panel.
In another embodiment, an OLED display device may include: an OLED panel including a non-flexible substrate; and a polarizer according to the present invention stacked on the OLED panel.
Next, the present invention will be described in more detail with reference to examples. It should be understood, however, that these examples are provided for illustrative purposes only and should not be construed as limiting the invention in any way.
Example 1
The polyvinyl alcohol film (ps#60, pre-stretched thickness: 60 μm, kuraray co., ltd., japan) was stretched to 6 times its original length in an aqueous iodine solution at 55 ℃ to prepare a 12 μm thick polarizer having a transmittance of 43%.
The coating layer for the second retardation layer was formed by depositing a composition for the second retardation layer [ an amorphous composition containing a cellulose ester polymer (containing trifluoroacetyl group) ] on the lower surface of a cyclic polyolefin (COP) film (ZD film, zeon co., ltd.) stretched at an angle of 45 ° with respect to the MD. Cellulose ester polymers are prepared by adding trifluoroacetic acid and trifluoroacetic anhydride to unsubstituted cellulose, followed by reaction and polymerization.
After drying the coating, the laminate of the coating and COP film was stretched to an elongation of 1.5 times relative to the MD of the COP film at 135 ℃ to prepare a laminate having a first retardation layer (positive wavelength dispersion) and a second retardation layer (positive wavelength dispersion) of the specifications listed in table 1.
A TAC film (thickness: 27 μm, konica Minolta co., ltd.) was bonded to the upper surface of the polarizer via an adhesive layer by depositing an adhesive for a polarizing plate on the upper surface of the polarizer as a protective layer, and a laminate of a first retardation layer and a second retardation layer was attached to the lower surface of the polarizer by depositing an adhesive for a polarizing plate on the lower surface of the polarizer, and then irradiated with UV light in a direction from the lower surface of the second retardation layer to the protective film.
A composition containing a light absorber (maximum absorption wavelength: 391nm, indole-based absorber, bonosorb UA3912, organic chemical co., ltd.) and an isocyanate curing agent (cornonate L) with respect to 100 parts by weight of a (meth) acrylic binder resin was prepared. The composition was deposited on the lower surface of the second retardation layer at a predetermined thickness and then cured to form a layer (thickness: 10 μm) containing a light absorber, thereby forming a polarizing plate. As shown in Table 1, the content (unit: wt%) of the light absorber was adjusted in the layer containing the light absorber.
Examples 2 to 4
A polarizing plate was manufactured in the same manner as in example 1 except that the retardation of each of the first and second retardation layers and the content of the light absorber in the layer containing the light absorber were changed as listed in table 1.
Example 5
A polarizing plate including a TAC film, a polarizer, a third retardation layer, a first retardation layer, and a second retardation layer, which were sequentially stacked in this order, was manufactured in the same manner as in example 1, except that a positive C layer (ret 550nm:0.3nm,Rthat 550nm: -35 nm) was additionally formed on the upper surface of the first retardation layer as the third retardation layer.
Comparative example 1
A polarizing plate was manufactured in the same manner as in example 1, except that a composition including 100 parts by weight of a (meth) acrylic adhesive resin and 9 parts by weight of an isocyanate curing agent (cornonate L) was used instead of the layer containing a light absorber to form an adhesive layer.
Comparative examples 2 to 8
A polarizing plate was manufactured in the same manner as in example 1 except that the in-plane retardation of each of the first retardation layer and the second retardation layer and/or the angle of the slow axis of each of the first retardation layer and the second retardation layer with respect to the transmission axis of the polarizer was changed as listed in table 1.
The retardation values Re, rth and NZ of the respective first and second retardation layers were measured at a wavelength of 550nm using an Axoscan polarimeter (AxoMetric co., ltd.).
The following properties of each of the polarizing plates manufactured in examples and comparative examples were evaluated. The results are shown in Table 1.
(1) Reflectivity (unit:%): reflectance was measured using a goniometer (DMS 803,Instrument Systems Inc. (Konica Minolta Group), japan). After measurement of the whiteboard provided to the goniometer, brightness and contrast are measured using an angle scanning function. Each of the polarizing plates manufactured in examples and comparative examples was adhered to a panel (glass substrate) by a pressure-sensitive adhesive, and then front and side reflectances were measured. Here, θ is measured at intervals of 5 °, and the reflectance is determined by obtaining spectral transmittance/reflectance (SCE) values of incident light from the front face (0 °) and the side face (60 °).
(2) Black visibility color values a and b: a module for an optical display device was manufactured by attaching each of the polarizers manufactured in examples and comparative examples to the upper surface of the organic light emitting diode panel via a layer containing a light absorber. The module for the optical display device was irradiated with light in a direction from the polarizer to the front face (0.05 °) using a spectrophotometer DMS 803 (Instrument Systems), and light was reflected and leaked from the respective polarizers of the respective examples and comparative examples, and black visibility color values a×and b×of the front face of the organic light emitting diode panel were measured according to CIE 1976a×b×standard.
(3) Ellipticity (%): ellipticity was measured by passing the light side (60 °) through a polarizer using an Axoscan polarimeter. Then, ellipticity was measured by passing light through a polarizer at the side (60 °) while rotating the polarimeter by 360 degrees. The minimum value of the circular polarization degree at the side (60 °) is shown in table 1.
TABLE 1
* Angle 1: angle of slow axis of first retardation layer with respect to transmission axis of polarizer
* Angle 2: angle of slow axis of second retardation layer with respect to transmission axis of polarizer
As shown in table 1, the polarizing plate according to the present invention has low reflectance at both the front and the side, satisfies the relationship between the color values a and b to improve the black visibility of the front, and satisfies the ellipticity of 62% or more.
In contrast, the polarizing plate of comparative example 1, which does not include a layer containing a light absorber, did not improve the black visibility at the front side because the relationship between the color values a and b was not satisfied, and the polarizing plates of comparative examples 2 to 8, which did not satisfy the conditions of the first retardation layer and the second retardation layer according to the present invention, had higher reflectivity than the polarizing plate according to the present invention, and did not improve the black visibility at the front side because the relationship between the color values a and b was not satisfied, although the layer containing a light absorber was present.
Although a few embodiments have been described herein, it will be appreciated by those skilled in the art that various modifications, changes, alterations, and equivalent embodiments may be made without departing from the spirit and scope of the invention.
Claims (13)
1. A polarizing plate, comprising:
a polarizer; and
a first retardation layer and a second retardation layer sequentially stacked on a lower surface of the polarizer, wherein:
the first retardation layer has an in-plane retardation (Re) of 180nm to 240nm at a wavelength of 550 nm;
the second retardation layer has an in-plane retardation (Re) of 70nm to 120nm at a wavelength of 550 nm;
the polarizer further includes a layer containing a light absorber; and is also provided with
The slow axis of the first retarder layer is inclined at an absolute value of an angle (alpha 1) of 60 DEG to 80 DEG with respect to the transmission axis of the polarizer, and the slow axis of the second retarder layer is inclined at an absolute value of an angle (alpha 2) of 0 DEG to 10 DEG with respect to the transmission axis of the polarizer,
wherein the first retardation layer and the second retardation layer each exhibit positive wavelength dispersion,
the first retarder layer has a positive biaxial degree at a wavelength of 550nm and the second retarder layer has a negative biaxial degree at a wavelength of 550 nm.
2. The polarizer of claim 1, wherein the layer comprising a light absorber comprises a light absorber having a maximum absorption wavelength of 380nm to 420 nm.
3. The polarizer of claim 2, wherein the light absorber is present in the light absorber-containing layer in an amount of 0.1wt% to 6 wt%.
4. The polarizing plate according to claim 2, wherein the light absorber comprises at least one selected from the group consisting of indole, phenylbenzotriazole and triazine light absorbers.
5. The polarizer of claim 1, wherein the laminate of the first and second retarder layers has an in-plane retardation (Re) of 120nm to 200nm at a wavelength of 550 nm.
6. The polarizer of claim 1, wherein the first retarder layer has a positive out-of-plane retardation (Rth) at a wavelength of 550nm and the second retarder layer has a negative out-of-plane retardation (Rth) at a wavelength of 550 nm.
7. The polarizer of claim 1, wherein an angle defined between the slow axis of the first retarder layer and the slow axis of the second retarder layer is in a range of 50 ° to 70 °.
8. The polarizing plate according to claim 1, wherein the angle α1 is in a range of +60° to +80° and the angle α2 is in a range of 0 ° to +10°, or the angle α1 is in a range of-80 ° to-60 ° and the angle α2 is in a range of-10 ° to 0 °.
9. The polarizing plate according to claim 1, wherein the layer containing a light absorber is formed on a lower surface of the second retardation layer, between the first retardation layer and the second retardation layer, and/or between the polarizer and the first retardation layer.
10. The polarizer of claim 1, wherein the second retardation layer comprises at least one selected from the group consisting of cellulose ester polymers and polystyrene polymers.
11. The polarizing plate according to claim 1, further comprising: and a protective layer formed on an upper surface of the polarizer.
12. The polarizing plate according to claim 1, further comprising: positive C layer.
13. An optical display device comprising the polarizing plate according to any one of claims 1 to 12.
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|---|---|---|---|
| KR10-2020-0054124 | 2020-05-06 | ||
| KR1020200054124A KR20210135888A (en) | 2020-05-06 | 2020-05-06 | Polarizing plate and optical display apparatus comprising the same |
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| CN113625384B true CN113625384B (en) | 2024-03-05 |
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| CN1650197A (en) * | 2002-04-23 | 2005-08-03 | 日东电工株式会社 | Polarizing element, polarizing light source and picture display device using them |
| CN104252016A (en) * | 2013-06-28 | 2014-12-31 | 第一毛织株式会社 | Polarizing plate for OLED and OLED display including the same |
| KR20160001657A (en) * | 2014-06-27 | 2016-01-06 | 삼성전자주식회사 | Optical film, manufacturing method thereof and display device |
| CN105301688A (en) * | 2014-07-23 | 2016-02-03 | 三星Sdi株式会社 | Polarizing plate and optical display including the same |
| JP2017102286A (en) * | 2015-12-02 | 2017-06-08 | 日東電工株式会社 | Optical laminate in a long form and image display device |
| CN108303762A (en) * | 2017-01-13 | 2018-07-20 | 三星Sdi株式会社 | Polarizer for luminous display unit and the luminous display unit including it |
| CN109416426A (en) * | 2016-06-30 | 2019-03-01 | 住友化学株式会社 | Phase difference film |
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2020
- 2020-05-06 KR KR1020200054124A patent/KR20210135888A/en not_active Application Discontinuation
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2021
- 2021-05-06 CN CN202110489918.7A patent/CN113625384B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1650197A (en) * | 2002-04-23 | 2005-08-03 | 日东电工株式会社 | Polarizing element, polarizing light source and picture display device using them |
| CN104252016A (en) * | 2013-06-28 | 2014-12-31 | 第一毛织株式会社 | Polarizing plate for OLED and OLED display including the same |
| KR20160001657A (en) * | 2014-06-27 | 2016-01-06 | 삼성전자주식회사 | Optical film, manufacturing method thereof and display device |
| CN105301688A (en) * | 2014-07-23 | 2016-02-03 | 三星Sdi株式会社 | Polarizing plate and optical display including the same |
| JP2017102286A (en) * | 2015-12-02 | 2017-06-08 | 日東電工株式会社 | Optical laminate in a long form and image display device |
| CN109416426A (en) * | 2016-06-30 | 2019-03-01 | 住友化学株式会社 | Phase difference film |
| CN108303762A (en) * | 2017-01-13 | 2018-07-20 | 三星Sdi株式会社 | Polarizer for luminous display unit and the luminous display unit including it |
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| KR20210135888A (en) | 2021-11-16 |
| CN113625384A (en) | 2021-11-09 |
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