WO2010122911A1 - 偏光薄膜、偏光板および液晶表示装置 - Google Patents
偏光薄膜、偏光板および液晶表示装置 Download PDFInfo
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- WO2010122911A1 WO2010122911A1 PCT/JP2010/056442 JP2010056442W WO2010122911A1 WO 2010122911 A1 WO2010122911 A1 WO 2010122911A1 JP 2010056442 W JP2010056442 W JP 2010056442W WO 2010122911 A1 WO2010122911 A1 WO 2010122911A1
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- thin film
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- polarizing thin
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- 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
-
- 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
Definitions
- the present invention relates to a polarizing thin film comprising a polyvinyl alcohol-based resin layer containing a dichroic substance, a polarizing plate having the polarizing thin film, and a liquid crystal display device including the polarizing thin film or the polarizing plate.
- Patent Document 1 a polarizing thin film made of a polyvinyl alcohol-based resin layer containing a dichroic substance is known (for example, Patent Document 1).
- FIG. 5 is a schematic diagram of an example of a conventional polarizing thin film 50.
- a polarizing thin film 50 made of a polyvinyl alcohol-based resin layer 52 containing a dichroic substance 51 in a conventional polarizing thin film 50.
- the natural light 53 can be decomposed into a component in the absorption axis direction 54 of the polarizing thin film 50 and a component in the transmission axis direction (not shown).
- the vibration surface absorbs light in the absorption axis direction 54 and the vibration surface transmits light 55 in the transmission axis direction.
- Light whose vibration surface is in the absorption axis direction 54 is generally referred to as abnormal light, and light 55 whose vibration surface is in the transmission axis direction is generally referred to as ordinary light.
- the absorption axis direction 54 is orthogonal to the transmission axis direction. Since the energy of the light absorbed at this time is changed to thermal energy, 57% or more of the incident natural light 53 is lost.
- the conventional polarizing thin film 50 absorbs extraordinary light and converts it into heat energy. Therefore, 57% or more of the incident natural light 53 is lost.
- the present invention provides a polarizing thin film having a function of reflecting a part of extraordinary light. According to the present invention, light loss in the polarizing thin film can be reduced.
- the gist of the present invention is as follows.
- the polarizing thin film of this invention is a polarizing thin film which consists of a polyvinyl alcohol-type resin layer containing a dichroic substance.
- the polarizing thin film of the present invention is (A) The film thickness is 0.5 ⁇ m to 5 ⁇ m, (B) Absorbance of extraordinary light per 1 ⁇ m thickness with respect to monochromatic light having a wavelength of 550 nm is 1.5 to 7.0.
- the dichroic substance is iodine.
- the polyvinyl alcohol-based resin layer is polyvinyl alcohol or an ethylene-vinyl alcohol copolymer.
- the polarizing plate of the present invention has any of the polarizing thin films described above and a transparent substrate that supports the polarizing thin film from one side. And the refractive index of the transparent base material of the absorption axis direction of a polarizing thin film is less than 1.54.
- the liquid crystal display device of the present invention is a liquid crystal display device having a liquid crystal cell and a backlight, and has the polarizing thin film between the liquid crystal cell and the backlight.
- the liquid crystal display device of the present invention is a liquid crystal display device having a liquid crystal cell and a backlight, and has the polarizing plate between the liquid crystal cell and the backlight.
- FIG. 1 schematically shows a polarizing thin film 10 of the present invention.
- a polarizing thin film 10 comprising a polyvinyl alcohol-based resin layer 12 containing a high-concentration dichroic substance 11 and having a film thickness t of 0.5 ⁇ m to 5 ⁇ m partially reflects abnormal light.
- Abnormal light is light 15 whose vibration surface is in the absorption axis direction 13.
- the high concentration means a concentration at which the absorbance (unit absorbance) of abnormal light per unit thickness of 1 ⁇ m with respect to monochromatic light having a wavelength of 550 nm is 1.5 or more.
- the polarizing thin film 10 of the present invention reflects a part of the abnormal light and transmits the ordinary light.
- Ordinary light is light 16 whose vibration surface is in the direction of the transmission axis.
- the square value (k 2 ) of the extinction coefficient increases when the concentration of the dichroic substance 11 and the film thickness t of the polarizing thin film 10 are in a specific range. Since the polarizing thin film 10 of the present invention satisfies the condition, it is considered that the reflectance R e of abnormal light is large.
- the conventional polarizing thin film 50 (FIG. 5) only shows normal interface reflection because the concentration of the dichroic substance and the thickness of the polarizing thin film 50 do not satisfy the conditions defined by the present invention.
- the square value (k 2 ) of the extinction coefficient is small, Re takes a substantially constant value in a range of less than 5%. Therefore, the effect of the present invention cannot be obtained.
- the polarizing thin film 10 of the present invention reflects part of abnormal light.
- the reflectance of abnormal light is, for example, 5% or more with respect to incident light. Since this reflected light remains as light energy, it can be reflected again by another reflecting material and reused.
- the brightness of the liquid crystal display device can be improved without using an expensive existing brightness enhancement film.
- FIG. 1 shows an example of the polarizing thin film 10 of the present invention.
- the polarizing thin film 10 of the present invention comprises a polyvinyl alcohol resin layer 12 containing a dichroic substance 11.
- the polarizing thin film 10 of the present invention exhibits absorption anisotropy and reflection anisotropy at any wavelength in the visible light region (wavelength 380 nm to 780 nm).
- the polarizing thin film 10 of the present invention may further contain an appropriate additive as long as it is composed of the polyvinyl alcohol resin layer 12 containing the dichroic substance 11.
- Such additives include surfactants and antioxidants.
- the polarizing thin film 10 of the present invention is characterized by a thin film thickness t and a high concentration of the dichroic substance 11.
- the thickness t of the polarizing thin film 10 is 0.5 ⁇ m to 5 ⁇ m, preferably 0.5 ⁇ m to 3 ⁇ m.
- the film thickness t of the polarizing thin film 10 exceeds 5 ⁇ m, the extraordinary light reflectance is lowered.
- the film thickness t of the polarizing thin film 10 is smaller than 0.5 ⁇ m, it is difficult to stretch the polyvinyl alcohol-based resin layer 12 and the orientation of the dichroic substance 11 may be incomplete.
- the unit absorbance of the polarizing thin film 10 of the present invention with respect to monochromatic light having a wavelength of 550 nm is preferably 1.5 to 7.0, and more preferably 1.8 to 7.0.
- the unit absorbance is in the above range under the condition that the film thickness t is 0.5 ⁇ m to 5 ⁇ m.
- the dichroic substance 11 used in the present invention is typically iodine, an organic dye, and a mixture thereof.
- iodine is preferable.
- the polyvinyl alcohol-based resin layer 12 used in the present invention is formed by forming a polyvinyl alcohol-based resin into a layer shape.
- the polyvinyl alcohol resin is typically obtained by saponifying a polyvinyl acetate resin.
- the polyvinyl alcohol resin used in the present invention usually has a saponification degree of 85 mol% to 100 mol% and a polymerization degree of 1,000 to 10,000.
- the polyvinyl alcohol resin used in the present invention is, for example, polyvinyl alcohol or an ethylene-vinyl alcohol copolymer.
- the polarizing thin film 10 of the present invention can be obtained by immersing and dyeing the stretched polyvinyl alcohol-based resin layer 12 in a staining solution containing the dichroic substance 11.
- the polyvinyl alcohol resin layer 12 can be obtained by immersing and dyeing it in a dyeing solution containing the dichroic substance 11 and stretching the dyed polyvinyl alcohol resin layer 12.
- any stretching method such as roll stretching or tenter stretching is used.
- the draw ratio of the polyvinyl alcohol-based resin layer 12 is usually 3 to 7 times the original length.
- the stretching temperature of the polyvinyl alcohol-based resin layer 12 is usually 30 ° C. to 160 ° C.
- the film thickness of the polyvinyl alcohol-based resin layer 12 before stretching is set so that the film thickness t after stretching is 0.5 ⁇ m to 5 ⁇ m.
- the concentration of the aqueous solution containing the dichroic substance 11 for dyeing the polyvinyl alcohol-based resin layer 12 is preferably more than 1 part by weight and 5 parts by weight with respect to 100 parts by weight of water. It is as follows.
- the unit absorbance of the polarizing thin film 10 can be adjusted by adding boric acid, urea, potassium iodide or the like to the staining solution. For example, when the amount of potassium iodide added in the staining solution is increased, the unit absorbance increases. On the other hand, increasing the amount of boric acid added to the staining solution decreases the unit absorbance.
- the temperature and immersion time of the staining solution are determined so that the characteristics specified in the present invention are satisfied according to the concentration of the staining solution and the film thickness of the polyvinyl alcohol resin layer.
- the temperature of the staining solution is preferably 10 ° C. to 40 ° C.
- the immersion time is preferably 20 seconds to 300 seconds. Under such conditions, the unit absorbance of the polarizing thin film can be set to 1.5 to 7.0.
- the stretched and dyed polyvinyl alcohol resin layer is preferably treated with boric acid by immersing it in an aqueous boric acid solution in order to impart water resistance.
- the boric acid-treated polarizing thin film is usually washed with water and dried.
- the polarizing plate 20 of the present invention has a polarizing thin film 10 and a transparent substrate 21 that supports the polarizing thin film 10 from one side.
- the refractive index of the transparent substrate 21 in the absorption axis direction 13 of the polarizing thin film 10 is less than 1.54.
- the polarizing plate 20 of the present invention reflects part of abnormal light and transmits ordinary light when natural light 22 is incident.
- the difference of the extraordinary refractive index of the polarizing film 10 is large.
- the extraordinary light refractive index of the polarizing thin film 10 (the refractive index in the absorption axis direction 13) is about 1.54. Therefore, the refractive index of the transparent base material 21 in the absorption axis direction 13 of the polarizing thin film 10 is preferably 1.53 or less.
- the transparent substrate 21 is not particularly limited as long as it satisfies the above refractive index conditions, but is preferably a transparent polymer film.
- the polarizing thin film 10 may be directly formed on the transparent substrate 21, or may be laminated via an adhesive layer.
- the refractive index of the adhesive layer in the absorption axis direction 13 of the polarizing thin film 10 is also preferably 1.53 or less.
- the transmittance of the polarizing plate 20 is preferably 25% to 44%, more preferably 35% to 42%.
- the polarization degree of the polarizing plate 20 is preferably 99% or more.
- the abnormal light reflectivity R e of the polarizing plate 20 can be 5% or more, preferably from 5% to 15%.
- the luminance improvement ratio of the polarizing plate 20 can be set to 1.4% or more, and preferably 1.4% to 3.0%.
- the liquid crystal display device 30 of the present invention includes a liquid crystal cell 31 and a backlight 32, and includes the polarizing thin film 10 of the present invention between the liquid crystal cell 31 and the backlight 32.
- the liquid crystal display device 40 of the present invention includes a liquid crystal cell 41 and a backlight 42, and includes the polarizing plate 20 of the present invention between the liquid crystal cell 41 and the backlight 42.
- the polarizing thin film 10 used in the liquid crystal display device 30 of the present invention transmits ordinary light among the incident light 33 from the light source 32a of the backlight 32, and reflects a part of the abnormal light.
- the light 35 reflected by the polarizing thin film 10 is reflected again by the back surface reflecting film 32b of the backlight 32, and becomes a light 36 having a vibration surface rotated by 90 °.
- the light 36 passes through the polarizing thin film 10 to become light 37 and enters the liquid crystal cell 31.
- the light incident on the liquid crystal cell 31 is increased by the amount of the light 37, so that the luminance of the liquid crystal display device 30 is improved.
- the light incident on the liquid crystal cell 41 is increased by the same mechanism as the liquid crystal display device 30 of the present invention, so that the luminance of the liquid crystal display device 40 is improved.
- incident light 43 from the backlight 42 is incident from the transparent substrate 21 side as shown in FIG.
- the polarizing thin film 10 may be on the backlight 42 side, and the incident light 43 from the backlight 42 may be incident from the polarizing thin film 10 side.
- the extraordinary light reflectivity R e of the polarizing film 10 can be increased.
- the liquid crystal cells 31 and 41 used in the present invention usually include two substrates and a liquid crystal layer sandwiched between the substrates.
- a color filter, a counter electrode, and an alignment film are formed on one substrate, and a liquid crystal driving electrode, a wiring pattern, a thin film transistor element, and an alignment film are formed on the other substrate.
- the operation modes of the liquid crystal cells 31 and 41 include, for example, a twisted nematic mode and a birefringence control (electrically controlled birefringence) mode.
- the birefringence control (electrically controlled birefringence) mode includes a vertical alignment (Vertical Alignment) system, an OCB (Optically Compensated) system, an IPS (In-Plane Switching) system, and the like.
- the backlights 32 and 42 used in the present invention may be of any type such as a direct light method, a side light method, and a planar light source method.
- the backlights 32 and 42 usually include light sources 32a and 42a and back surface reflection films 32b and 42b.
- Example 1 Corona treatment was performed on the surface of a transparent substrate made of a norbornene-based resin film (ARTON manufactured by JSR) having a thickness of 150 ⁇ m. (2) A 7% by weight aqueous solution of polyvinyl alcohol (NH18 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was applied to one side of the norbornene-based resin film to prepare a laminated film of the norbornene-based resin film and the polyvinyl alcohol film. (3) A laminated film of a norbornene resin film and a polyvinyl alcohol film was dried at 100 ° C.
- the laminated film was roll-drawn at 150 ° C. so that the draw ratio was 5 times the original length.
- the stretched laminated film was immersed in a dyeing solution (liquid temperature 20 ° C.) composed of an aqueous solution containing iodine and potassium iodide for 30 seconds to adsorb and align iodine in the polyvinyl alcohol layer.
- the laminated film was immersed in an aqueous boric acid solution having a concentration of 10% by weight (liquid temperature 55 ° C.) for 420 seconds, and further immersed in an aqueous solution of potassium iodide having a concentration of 4% by weight for 10 seconds.
- the laminated film was dried at 60 ° C. for 4 minutes.
- a polarizing film having a polarizing thin film and a transparent substrate that supports the polarizing thin film from one side was produced.
- the polarizing thin film was a polyvinyl alcohol layer and had a transmittance of 41% and a degree of polarization of 99.8% or more.
- the transparent substrate was a norbornene resin film. Table 1 shows the characteristics of the polarizing thin film and the polarizing plate.
- the iodine content of the dyeing solution was 1.1 parts by weight with respect to 100 parts by weight of water. Moreover, potassium iodide content was 10 weight part with respect to 100 weight part of water.
- the refractive index in the absorption axis direction of the polarizing thin film of the stretched norbornene resin film was 1.52.
- Example 2 A polarizing film having a polarizing thin film and a transparent substrate that supports the polarizing thin film from one side was prepared in the same manner as in Example 1 except that the thickness of the polyvinyl alcohol layer before stretching was 3 ⁇ m.
- the polarizing thin film was a polyvinyl alcohol layer and had a transmittance of 41% and a degree of polarization of 99.8% or more.
- the transparent substrate was a norbornene resin film. Table 1 shows the characteristics of the polarizing thin film and the polarizing plate.
- Example 2 A polarizing film having a polarizing thin film and a transparent substrate that supports the polarizing thin film from one side in the same manner as in Example 1 except that the time of immersion in the staining liquid (liquid temperature 20 ° C.) was changed to 10 seconds. Produced.
- the polarizing thin film was a polyvinyl alcohol layer and had a transmittance of 41% and a degree of polarization of 99.8% or more.
- the transparent substrate was a norbornene resin film. Table 1 shows the characteristics of the polarizing thin film and the polarizing plate.
- the backlight was taken out from a commercially available 32-inch liquid crystal television (Wood manufactured by Hitachi, Ltd.). Moreover, the sample which stuck each polarizing plate of the Example and the comparative example on the glass plate was prepared. The sample was placed in front of the backlight so that the light from the backlight was incident from the polarizing thin film side. Using a luminance meter (BM-5 manufactured by Topcon Corporation), the luminance (B 1 ) from the front direction after the backlight was turned on was measured.
- BM-5 luminance meter
- Brightness enhancement ratio (%) is the luminance when using the polarizing plate of Comparative Example 1 and B 0, was calculated by the following equation.
- Luminance improvement ratio (%) (B 1 ⁇ B 0 ) / B 0 ⁇ 100
- the liquid crystal display device of the present invention is suitably used for liquid crystal televisions, computer displays, car navigation systems, mobile phones, game machines, and the like.
- Polarizing thin film 11 Dichroic substance 12 Polyvinyl alcohol-type resin layer 13 Absorption axis direction 14 Natural light 15 Reflected light 16 Transmitted light 20 Polarizing plate 21 Transparent base material 22 Natural light 23 Reflected light 24 Transmitted light 30 Liquid crystal display device 31 Liquid crystal cell 32 Back Light 32a Light source 32b Back surface reflective film 33 Natural light 34 Transmitted light 35 Reflected light 36 Reflected light 37 Transmitted light 40 Liquid crystal display device 41 Liquid crystal cell 42 Back light 42a Light source 42b Back surface reflective film 43 Incident light 50 Polarized thin film 51 Dichroic material 52 Polyvinyl Alcohol-based resin layer 53 Natural light 54 Absorption axis direction 55 Transmitted light
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Abstract
Description
(1)本発明の偏光薄膜は、二色性物質を含むポリビニルアルコール系樹脂層からなる偏光薄膜である。本発明の偏光薄膜は、
(a)膜厚が0.5μm~5μmであり、
(b)波長550nmの単色光に対する、膜厚1μmあたりの異常光の吸光度が、1.5~7.0である。
(2)本発明の偏光薄膜では、二色性物質がヨウ素である。
(3)本発明の偏光薄膜では、ポリビニルアルコール系樹脂層が、ポリビニルアルコール、あるいは、エチレン-ビニルアルコール共重合体である。
(4)本発明の偏光板は、上記に記載のいずれかの偏光薄膜と、偏光薄膜を片側から支持する透明基材を有する。そして、偏光薄膜の吸収軸方向の、透明基材の屈折率が1.54未満である。
(5)本発明の液晶表示装置は、液晶セルとバックライトを有する液晶表示装置であり、液晶セルとバックライトの間に、上記の偏光薄膜を有する。
(6)本発明の液晶表示装置は、液晶セルとバックライトを有する液晶表示装置であり、液晶セルとバックライトの間に、上記の偏光板を有する。
Re={(n1-ne)2+k2}/{(n1+ne)2+k2} …(1)
と表わされる。
図1に本発明の偏光薄膜10の一例を示す。本発明の偏光薄膜10は、二色性物質11を含むポリビニルアルコール系樹脂層12からなる。本発明の偏光薄膜10は、可視光領域(波長380nm~780nm)のいずれかの波長で、吸収異方性と反射異方性を示す。
本発明に用いられる二色性物質11は、代表的には、ヨウ素、有機染料、およびそれらの混合物である。二色性物質11としては、ヨウ素が好ましい。
本発明に用いられるポリビニルアルコール系樹脂層12は、ポリビニルアルコール系樹脂を層状に成形したものである。
本発明の偏光薄膜10は、延伸したポリビニルアルコール系樹脂層12を、二色性物質11を含む染色液中に浸漬し、染色して得ることができる。あるいは、ポリビニルアルコール系樹脂層12を二色性物質11を含む染色液中に浸漬して染色し、染色したポリビニルアルコール系樹脂層12を延伸して得ることができる。
図2に示すように、本発明の偏光板20は、偏光薄膜10と、偏光薄膜10を片側から支持する透明基材21を有する。偏光薄膜10の吸収軸方向13の、透明基材21の屈折率は、1.54未満である。
図3に示すように、本発明の液晶表示装置30は、液晶セル31とバックライト32を有し、液晶セル31とバックライト32の間に、本発明の偏光薄膜10を有する。
[実施例1]
(1)膜厚150μmの、ノルボルネン系樹脂フィルム(JSR社製ARTON)からなる透明基材の表面に、コロナ処理を行なった。
(2)ノルボルネン系樹脂フィルムの片面に、ポリビニルアルコール(日本合成化学工業社製NH18)の、7重量%水溶液を塗布し、ノルボルネン系樹脂フィルムとポリビニルアルコール膜の積層フィルムを作製した。
(3)ノルボルネン系樹脂フィルムとポリビニルアルコール膜の積層フィルムを、100℃で10分間乾燥して、ノルボルネン系樹脂フィルムの片面に、膜厚5μmのポリビニルアルコール層を成膜した。
(4)積層フィルムを、延伸倍率が元長の5倍になるように、150℃でロール延伸した。
(5)延伸した積層フィルムを、ヨウ素とヨウ化カリウムを含む水溶液からなる染色液(液温20℃)に30秒間浸漬して、ポリビニルアルコール層にヨウ素を吸着・配向させた。
(6)積層フィルムを、濃度10重量%のホウ酸水溶液(液温55℃)に420秒間浸漬し、さらに濃度4重量%のヨウ化カリウム水溶液に10秒間浸漬した。
(7)積層フィルムを60℃で4分間乾燥した。
以上のようにして、偏光薄膜、および、偏光薄膜を片側から支持する透明基材を有する偏光板を作製した。偏光薄膜は、ポリビニルアルコール層であり、透過率が41%、偏光度が99.8%以上であった。透明基材は、ノルボルネン系樹脂フィルムであった。この偏光薄膜と偏光板の特性を表1に示す。
延伸前のポリビニルアルコール層の膜厚を3μmとした以外は、実施例1と同様にして、偏光薄膜、および、偏光薄膜を片側から支持する透明基材を有する偏光板を作製した。偏光薄膜は、ポリビニルアルコール層であり、透過率が41%、偏光度が99.8%以上であった。透明基材は、ノルボルネン系樹脂フィルムであった。この偏光薄膜と偏光板の特性を表1に示す。
市販の偏光板(日東電工社製NPF-SEG1224、透過率43%、偏光度99.8%以上)を評価した。
染色液(液温20℃)に浸漬する時間を10秒間に変更した以外は、実施例1と同様の方法で、偏光薄膜、および、偏光薄膜を片側から支持する透明基材を有する偏光板を作製した。偏光薄膜は、ポリビニルアルコール層であり、透過率が41%、偏光度が99.8%以上であった。透明基材は、ノルボルネン系樹脂フィルムであった。この偏光薄膜と偏光板の特性を表1に示す。
表1に示すように、比較例1および2の偏光板に比べ、実施例1の偏光板の輝度向上割合は高く、実施例2の偏光板の輝度向上割合はさらに高かった。
[膜厚]
デジタルマイクロメーター(アンリツ社製KC-351C)を用いて、偏光薄膜などの膜厚を測定した。
単位吸光度の測定には、グランテーラープリズム偏光子を備えた積分球付分光光度計(日立製作所製U-4100)を用いた。染色前の延伸ポリビニルアルコール層をレファレンスとして、ベースライン補正を行なった。偏光薄膜の、波長550nmの単色光に対する異常光の透過率k2を測定し、次式により単位吸光度を求めた。
単位吸光度(1/μm)=-Ln(k2)/膜厚(μm)
なお表1の単位吸光度は、測定光を偏光薄膜側から入射させたときの値である。
裏面反射を無視できる程度に低減するため、偏光板の透明基材側を紙やすりで荒らした後、アクリル黒ラッカーを吹き付けて、よく乾燥させた。偏光薄膜側から測定光を入射させ、グランテーラープリズム偏光子を備えた積分球付分光光度計(日立製作所製U-4100)を用いて、波長550nmの単色光に対する異常光の反射率を測定した。なお、標準白色板(BaSO4)の反射率を100%とした。
市販の32インチ液晶テレビ(日立製作所製Woo)から、バックライトを取り出した。また、実施例、比較例の各偏光板を、ガラス板に貼着したサンプルを準備した。偏光薄膜側からバックライトの光が入射するように、サンプルをバックライトの前面に配置した。輝度計(トプコン社製BM-5)を用いて、バックライト点灯後の正面方向からの輝度(B1)を測定した。
輝度向上割合(%)=(B1-B0)/B0×100
11 二色性物質
12 ポリビニルアルコール系樹脂層
13 吸収軸方向
14 自然光
15 反射光
16 透過光
20 偏光板
21 透明基材
22 自然光
23 反射光
24 透過光
30 液晶表示装置
31 液晶セル
32 バックライト
32a 光源
32b 裏面反射膜
33 自然光
34 透過光
35 反射光
36 反射光
37 透過光
40 液晶表示装置
41 液晶セル
42 バックライト
42a 光源
42b 裏面反射膜
43 入射光
50 偏光薄膜
51 二色性物質
52 ポリビニルアルコール系樹脂層
53 自然光
54 吸収軸方向
55 透過光
Claims (9)
- 二色性物質を含むポリビニルアルコール系樹脂層からなる偏光薄膜であって、
(a)膜厚が0.5μm~5μmであり、
(b)波長550nmの単色光に対する、膜厚1μmあたりの異常光の吸光度(単位吸光度)が、1.5~7.0
であることを特徴とする偏光薄膜。 - 前記二色性物質がヨウ素であることを特徴とする、請求項1に記載の偏光薄膜。
- 前記ポリビニルアルコール系樹脂層が、ポリビニルアルコール、あるいは、エチレン-ビニルアルコール共重合体であることを特徴とする、請求項1または2に記載の偏光薄膜。
- 請求項1または2に記載の偏光薄膜と、前記偏光薄膜を片側から支持する透明基材とを有する偏光板であって、
前記透明基材の、前記偏光薄膜の吸収軸方向の屈折率が1.54未満であることを特徴とする偏光板。 - 請求項3に記載の偏光薄膜と、前記偏光薄膜を片側から支持する透明基材とを有する偏光板であって、
前記透明基材の、前記偏光薄膜の吸収軸方向の屈折率が1.54未満であることを特徴とする偏光板。 - 液晶セルとバックライトを有する液晶表示装置であって、
前記液晶セルと前記バックライトとの間に、請求項1または2に記載の偏光薄膜を有することを特徴とする液晶表示装置。 - 液晶セルとバックライトを有する液晶表示装置であって、
前記液晶セルと前記バックライトとの間に、請求項3に記載の偏光薄膜を有することを特徴とする液晶表示装置。 - 液晶セルとバックライトを有する液晶表示装置であって、
前記液晶セルと前記バックライトとの間に、請求項4に記載の偏光板を有することを特徴とする液晶表示装置。 - 液晶セルとバックライトを有する液晶表示装置であって、
前記液晶セルと前記バックライトとの間に、請求項5に記載の偏光板を有することを特徴とする液晶表示装置。
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US13/265,597 US20120038859A1 (en) | 2009-04-21 | 2010-04-09 | Polarizing thin film, polarizing plate and liquid crystal display device |
CN201080017635.2A CN102405427B (zh) | 2009-04-21 | 2010-04-09 | 偏光板及液晶显示装置 |
EP10766969.9A EP2423716B1 (en) | 2009-04-21 | 2010-04-09 | Polarizing thin film, polarizing plate and liquid crystal display device |
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JP2009-103023 | 2009-04-21 | ||
JP2009103023 | 2009-04-21 | ||
JP2010-086642 | 2010-04-05 | ||
JP2010086642A JP2010271703A (ja) | 2009-04-21 | 2010-04-05 | 偏光薄膜、偏光板および液晶表示装置 |
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WO2010122911A1 true WO2010122911A1 (ja) | 2010-10-28 |
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US (1) | US20120038859A1 (ja) |
EP (1) | EP2423716B1 (ja) |
JP (1) | JP2010271703A (ja) |
KR (1) | KR20120006491A (ja) |
CN (1) | CN102405427B (ja) |
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WO (1) | WO2010122911A1 (ja) |
Cited By (2)
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---|---|---|---|---|
CN104641268A (zh) * | 2013-02-07 | 2015-05-20 | 日东电工株式会社 | 具有偏振膜的光学叠层体 |
JP2016224469A (ja) * | 2010-09-03 | 2016-12-28 | 日東電工株式会社 | 薄型偏光膜 |
Families Citing this family (7)
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JP6054603B2 (ja) * | 2010-03-31 | 2016-12-27 | 住友化学株式会社 | 偏光性積層フィルムおよび偏光板 |
KR20140144752A (ko) * | 2012-01-19 | 2014-12-22 | 삼성디스플레이 주식회사 | 유기 발광 표시 장치 및 유기 발광 표시 장치의 제조 방법 |
CN105518497B (zh) * | 2013-09-13 | 2018-11-16 | 株式会社可乐丽 | 偏光膜 |
CN106062596B (zh) * | 2014-03-04 | 2019-02-26 | 株式会社可乐丽 | 偏振膜 |
US20160033699A1 (en) | 2014-08-04 | 2016-02-04 | Nitto Denko Corporation | Polarizing plate |
TWI743373B (zh) * | 2017-09-13 | 2021-10-21 | 日商日東電工股份有限公司 | 偏光膜、偏光板、及偏光膜之製造方法 |
KR20200042395A (ko) * | 2018-10-15 | 2020-04-23 | 닛토덴코 가부시키가이샤 | 위상차층 부착 편광판 및 이를 이용한 화상 표시 장치 |
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- 2010-04-09 WO PCT/JP2010/056442 patent/WO2010122911A1/ja active Application Filing
- 2010-04-09 US US13/265,597 patent/US20120038859A1/en not_active Abandoned
- 2010-04-09 EP EP10766969.9A patent/EP2423716B1/en not_active Not-in-force
- 2010-04-09 KR KR1020117022539A patent/KR20120006491A/ko not_active Application Discontinuation
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Also Published As
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KR20120006491A (ko) | 2012-01-18 |
US20120038859A1 (en) | 2012-02-16 |
EP2423716A1 (en) | 2012-02-29 |
EP2423716A4 (en) | 2012-11-14 |
CN102405427A (zh) | 2012-04-04 |
JP2010271703A (ja) | 2010-12-02 |
EP2423716B1 (en) | 2013-08-14 |
TW201100882A (en) | 2011-01-01 |
CN102405427B (zh) | 2014-09-03 |
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