CN108169955A

CN108169955A - Liquid crystal display device

Info

Publication number: CN108169955A
Application number: CN201810073029.0A
Authority: CN
Inventors: 村田浩; 村田浩一; 早川章太; 井上俊树; 佐佐木靖
Original assignee: Toyobo Co Ltd
Current assignee: Toyobo Co Ltd
Priority date: 2015-03-04
Filing date: 2016-03-02
Publication date: 2018-06-15
Anticipated expiration: 2036-03-02
Also published as: CN108169955B; CN106796371A; JPWO2016140235A1; JP6032385B1; KR20160138311A; TW201636704A; KR101813438B1; WO2016140235A1; CN106796371B; TWI691763B

Abstract

The present invention provides a kind of liquid crystal display device; in the liquid crystal display device of summit for being respectively provided with luminescent spectrum less than each wavelength region of 600nm and more than 600nm and below 780nm less than 495nm, 495nm in 400nm; even if in the case where using oriented film as polaroid protective film, rainbow spot is also suppressed.A kind of liquid crystal display device, it is with back light, 2 polarizers, and it is configured at the liquid crystal cells between aforementioned 2 polarizers, at least one of aforementioned 2 polarizers polarizer is the polarizer that oriented film is laminated on at least single side of polarizer, backlight light source is in 400nm less than 495nm, 495nm is respectively provided with the summit of luminescent spectrum less than each wavelength region of 600nm and more than 600nm and below 780nm, Rx will be set as in the wavelength of the summit at peak existing for the wavelength region of more than 600nm and below 780nm, half breadth is set as Ry, when the retardation that aforementioned oriented film has is set as Re, Ry/ (Rx/ (Re/Rx)) is more than 0.55.

Description

Liquid crystal display device

The application be the applying date on 03 02nd, 2016, application No. is 2016800020017, entitled " liquid crystal The divisional application of the application of display device ".

Technical field

The present invention relates to liquid crystal display devices.Specifically, it is related to the liquid crystal display device that iris color spot is inhibited to generate.

Background technology

The polarizer used in liquid crystal display device (LCD) is usually the knot that polarizer is clamped with 2 polaroid protective films Structure, the polarizer are obtained from being infected with iodine on polyvinyl alcohol (PVA) etc., as polaroid protective film, usually using three Cellulose acetate (TAC) film.In recent years, attend by the slimming of LCD, it is desirable that polarizer it is thin layer.But if make thus The thickness of TAC film used as protective film is thinning, then can not obtain enough mechanical strengths, in addition, it may occur that penetrability The problem of deterioration.In addition, TAC film is very expensive, as cheap replacement raw material, although proposing polyester film (patent Document 1~3), but there are problems that observing iris color spot.

In the case where the one-sided configuration of polarizer has the oriented polyester films of birefringence, from back light unit or polarization The rectilinearly polarized light that piece projects polarized condition when passing through polyester film can change.The light of transmission is according to as oriented polyester films Birefringence and thickness product retardation and show distinctive interference colours.Therefore, if using cold-cathode tube, thermionic-cathode tube etc. Discontinuous luminescent spectrum then shows different transmitted intensities according to wavelength and forms iris color spot (ginseng as light source According to：The pre- original text collection of 15th micro-optics meeting, the 30th~31).

As for solution to the problems described above, it is proposed that using have as white light-emitting diode it is continuous and The white light source of wider luminescent spectrum is as back light, using the oriented polyester films with certain retardation as polarization Piece protective film (patent document 4).

Existing technical literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2002-116320 bulletins

Patent document 2：Japanese Unexamined Patent Publication 2004-219620 bulletins

Patent document 3：Japanese Unexamined Patent Publication 2004-205773 bulletins

Patent document 4：WO2011/162198

Invention content

Problems to be solved by the invention

As the back light of liquid crystal display device, it is widely used includes blue LED and yttrium back and forth The white light-emitting diode for the light-emitting component that aluminium garnet system yellow fluorophor (YAG systems yellow fluorophor) is composed is (white Color LED).The luminescent spectrum of the white light source has wider spectrum in visible light region, and luminous efficiency is also excellent, therefore It is widely used as back light.But it for the liquid crystal display device using the White LED as back light, is only capable of Reproduce 20% or so color of the identifiable spectrum of human eye.

On the other hand, since colour gamut in recent years expands the raising of requirement, the luminescent spectrum of white light source is developed in R (red), G (green), B (indigo plant) each wavelength region be respectively provided with the liquid crystal display device of specific peak shape.For example, developing makes With the corresponding liquid crystal display device of wide colour gamutization of the various light sources such as following light source：Be utilized technology of quantum dots white light source, It has used based on exciting light in fluorophor of the region of R (red), G (green) with specific glow peak and the fluorophor of blue led The White LED light source that the White LED light source of mode, the White LED light source of 3 wavelength modes, combination red laser form.Will be sharp By the use of the white light source of technology of quantum dots as in the case of the liquid crystal display device of back light, it may be said that human eye can be reproduced More than 60% color of identifiable spectrum.These white light sources have used YAG systems yellow fluorophor than previous including White light-emitting diode light source peak half breadth it is narrow, and new discovery in the oriented film that will have retardation as inclined The polaroid protective film of the member of formation of tabula rasa in use, generate rainbow spot sometimes according to the type of light source.

Problem of the present invention is that provide a kind of following liquid crystal display device：It is using with each wave in R, G, B Long region has in the liquid crystal display device of the white light source of the luminescent spectrum of summit, even if in the member of formation as polarizer Polaroid protective film using in the case of oriented film, the generation of rainbow spot is also suppressed.

The solution to the problem

The representative present invention is as follows.

Item 1.

A kind of liquid crystal display device with back light, 2 polarizers and is configured between aforementioned 2 polarizers Liquid crystal cells,

At least one of aforementioned 2 polarizers polarizer is laminated with the inclined of oriented film for at least single side in polarizer Tabula rasa,

Backlight light source in 400nm less than 495nm, 495nm less than 600nm and more than 600nm and Each wavelength region of below 780nm is respectively provided with the summit of luminescent spectrum,

Rx, half value is wide will be set as in the wavelength of the summit at peak existing for the wavelength region of more than 600nm and below 780nm When degree is set as Ry, the retardation that aforementioned oriented film has is set as Re,

Ry/ (Rx/ (Re/Rx)) is more than 0.55.

Item 2.

According to the liquid crystal display device described in item 1, wherein, backlight light source 400nm less than 495nm, 495nm is respectively provided with the summit of luminescent spectrum less than each wavelength region of 600nm and more than 600nm and below 700nm.

Item 3.

Liquid crystal display device according to item 1 or 2, wherein, by the wavelength in aforementioned 400nm less than 495nm The wavelength of the summit at peak existing for region is set as Bx, and half breadth is set as By,

Gx will be set as less than the wavelength of the summit at peak existing for the wavelength region of 600nm, incite somebody to action half in aforementioned 495nm When value width is set as Gy,

By/ (Bx/ (Re/Bx)) is more than 0.55, and

Gy/ (Gx/ (Re/Gx)) is more than 0.55.

Item 4.

According to the liquid crystal display device described in any one of item 1~3, wherein, aforementioned Rx is more than 630nm.

Item 5.

According to the liquid crystal display device described in any one of item 1~4, wherein, aforementioned Ry is below 180nm.

The effect of invention

The liquid crystal display device of the present invention has wide colour gamut, and can be ensured that in arbitrary viewing angle iris color spot Generate the good visuality being suppressed significantly.

Description of the drawings

Fig. 1 is the figure of the transmissivity of the light of the oriented film for the retardation for showing to have 7000nm.

Fig. 2 shows there are examples during multiple peaks in single wavelength region.

Fig. 3 shows that there are examples during multiple peaks in single wavelength region.

Fig. 4 shows that there are examples during multiple peaks in single wavelength region.

Fig. 5 shows that there are examples during multiple peaks in single wavelength region.

Specific embodiment

In general, liquid crystal display device is with from the opposite side with back light towards the side (visible side) for showing image It is made of successively rear module, liquid crystal cells and front module.Rear module and front module usually by transparent substrate, be formed in The transparent conductive film of the liquid crystal cells side surface and the polarizer composition for being configured at its opposite side.Herein, for polarizer, In rear module, it is configured in the side opposite with back light, in front in component, is configured (visual in the side of display image Side).

The liquid crystal display device of the present invention at least using back light and the liquid crystal cells being configured between 2 polarizers as Member of formation.In addition, it is also suitable for other compositions other than these, such as colour filter, lens blooming, diffusion sheet, antireflection Film etc..Luminance brightness-improving film can be designed between light source side polarizer and back light.As luminance brightness-improving film, such as The linear polarization light transmission for making one, the reflection-type polarizer by orthogonal to that linear polarization light reflection can be enumerated.As Reflection-type polarizer, for example, DBEF (registered trademark) (Dua l of Sumitomo 3M Limited can be suitably used Brightness Enhancement Film) series luminance brightness-improving film.It should be noted that reflection-type polarizer is usual It is configured in a manner that the absorption axiss of reflection-type polarizer are parallel with the absorption axiss of light source side polarizer.

Polarizer have at least one face of polarizer that iodine is infected on PVA etc. with polaroid protective film be bonded and Into structure, but in the present invention, as at least one of the polaroid protective film for forming polarizer, use oriented film.

Can be using light guide plate, reflecting plate etc. as the sidelight mode of member of formation as the structure of backlight, or Full run-down type mode, in the present invention, as the back light of liquid crystal display device, preferably 400nm less than 495nm, 495nm is respectively provided with the summit of luminescent spectrum less than each wavelength region of 600nm and more than 600nm and below 780nm White light source.In one embodiment, light source preferably 400nm less than 495nm, 495nm less than Each wavelength region of 600nm and more than 600nm and below 700nm are respectively provided with the summit of luminescent spectrum.In known CIE chromaticity diagram Blue, green, each spike length of red of definition are respectively 435.8nm (blue), 546.1nm (green) and 700nm (red Color).Aforementioned 400nm is less than 495nm, 495nm less than each of 600nm and more than 600nm and below 780nm Wavelength region is respectively equivalent to blue region, green area and red area.As light source as described above, such as there is utilization The white light source of technology of quantum dots has used and based on exciting light is respectively provided with the glimmering of glow peak in the region of R (red), G (green) The White LED light source of body of light and the fluorophor mode of blue led, 3 wavelength modes White LED light source, combination red laser and Into White LED light source etc., in the present invention, the type of light source is not particularly limited, as long as described above, in 400nm Have respectively less than each wavelength region of 600nm and more than 600nm and below 780nm less than 495nm, 495nm There is the white light source of the summit of luminescent spectrum.As the red-emitting phosphors in aforementioned phosphors, for example, may be exemplified out by CaAlSiN₃：Eu etc. as the nitride fluorophor formed substantially, by CaS：Eu etc. is sulfide-based glimmering as what is formed substantially Body of light, by Ca₂SiO₄：Eu etc. as the silicate fluorophor formed substantially and other.In addition, as in aforementioned phosphors Green-emitting phosphor, such as may be exemplified out β-SiAlON：Eu etc. as the grand system's fluorophor of match formed substantially, by (Ba, Sr)₂SiO₄：Eu etc. as the silicate fluorophor formed substantially and other.

It can be described below, the half breadth at each peak has the preferred upper limit, lower limit.Under if half breadth is less than preferably Limit value then becomes easily to generate iris color spot, needs to thicken oriented film to improve the retardation of oriented film (Re), display Device is difficult to be thinned, therefore not preferably.If half breadth is more than the preferred upper limit, become difficult to obtain colour gamut expansion effect Fruit.Half breadth at the peak of each wavelength region is narrower, and colour gamut can be wider, if the half breadth stenosis at peak, luminous efficiency drop It is low, therefore luminous light is designed by the balance of required colour gamut and luminous efficiency, the retardation (Re) of the oriented film used The shape of spectrum.It should be noted that half breadth refers to herein, the peak width of 1/2 intensity of the peak intensity of the wavelength of summit (nm)。

400nm less than the wavelength region of 495nm, 495nm less than 600nm wavelength region or In arbitrary wavelength region in the wavelength region of more than 600nm and below 780nm there are multiple peaks in the case of, consider it is as follows. In the case where peak independently is in multiple peaks, the half breadth at the highest peak of peak intensity is preferably aftermentioned range.And then For other peaks of more than 70% intensity with highest peak intensity, half breadth is similarly more preferably aftermentioned model It encloses.One for the shape with multiple overlap of peaks independent peak, the peak intensity highest in it can directly measure multiple peaks Peak half breadth in the case of, use its half breadth.Herein, independent peak refers to, short wavelength side and long wave at peak This both sides of long side have the peak in the region for 1/2 intensity for reaching peak intensity.That is, multiple overlap of peaks, each peak in its both sides not In the case of with the region of 1/2 intensity for reaching peak intensity, by multiple peak as a whole, it is considered as a peak.For this One peak of the shape with multiple overlap of peaks of sample, by the width (nm) at the peak of 1/2 intensity of highest peak intensity therein As half breadth.It should be noted that using the highest point of the peak intensity in multiple peaks as summit.In Fig. 2~5, with double Represent that there are half breadths during multiple peaks in single wavelength region to arrow.

In fig. 2, for peak A and B, using each peak as starting point, exist in short wavelength side and long wavelength side and reach peak intensity 1/2 point of degree.Therefore, peak A and B is peak independently.In the case of figure 2, with the double of the peak A with highest peak intensity Half breadth is evaluated to the width of arrow.

In Fig. 3, there is 1/2 point for reaching peak intensity in its short wavelength side and long wavelength side in peak A, peak B is in its long wavelength 1/2 point for reaching peak intensity is not present in side.Therefore, peak A and peak B is concentrated depending on being independent 1 peak.It is more for having in this way One independent peak of the shape of a overlap of peaks, the half breadth at the highest peak of peak intensity in it can directly measure multiple peaks In the case of, its half breadth is independent to the half breadth at peak.Therefore, in the context of fig. 3, the half breadth at peak is The width of four-headed arrow.

In Fig. 4,1/2 point for reaching peak intensity is not present in its short wavelength side by peak A, and peak B is not present in its long wavelength side Reach the point of the 1/2 of peak intensity.Therefore, in Fig. 4 in the same manner as the situation of Fig. 3, peak A and peak B is concentrated depending on being independent 1 Peak, half breadth are the width represented by four-headed arrow.

In Fig. 5, there is 1/2 point for reaching peak intensity in its short wavelength side and long wavelength side in peak A, peak B is in its long wavelength 1/2 point for reaching peak intensity is not present in side.Therefore, peak A and peak B is concentrated depending on being independent 1 peak.For with multiple peaks One independent peak of the shape of overlapping, the feelings of the half breadth at the highest peak of peak intensity in it can directly measure multiple peaks Under condition, its half breadth is used.Therefore, in the case of fig. 5, half breadth is by the width shown in four-headed arrow.

For Fig. 2~5, using 400nm less than 495nm wavelength region to exemplify, in other wavelength regions Also same thinking methods are applied.

400nm less than the wavelength region of 495nm, 495nm less than 600nm wavelength region and 600nm The peak and other wavelength regions with highest peak intensity above and in each wavelength region of the wavelength region of below 780nm Peak is preferably in mutually independent relationship.Particularly, there is highest peak intensity less than the wavelength region of 600nm in 495nm Exist in the peak of degree and the wavelength region for having between the peak of highest peak intensity in the region of more than 600nm and below 780nm strong Spend less than 1/3 area of the peak intensity at the peak that there is highest peak intensity for the wavelength region in more than 600nm and below 780nm Domain is preferred in terms of in bright gay color property.

The luminescent spectrum of back light can be by using Hamamatsu Photonics K.K. multichannel optical splitters The optical splitters such as PMA-12 are measured.

Rx, half value is wide will be set as in the wavelength of the summit at peak existing for the wavelength region of more than 600nm and below 780nm When degree is set as Ry, the retardation that the oriented film used as polaroid protective film has is set as Re, Ry/ (Rx/ (Re/Rx)) Preferably more than 0.55.If Ry/ (Rx/ (Re/Rx)) is more than 0.55, the liquid crystal display from positive direction and inclined direction During device, the generation of rainbow spot can be inhibited, therefore preferably.Ry/ (Rx/ (Re/Rx)) is more preferably more than 0.60, further preferably For more than 0.65, be even more preferably more than 0.7, particularly preferably more than 0.75, be most preferably more than 0.8.Although the value The higher the better, but from the viewpoint of the filming of oriented film, the wide colour gamut of liquid crystal display device, preferably less than 10, More preferably less than 7, even more preferably less than 5, most preferably less than 3.It should be noted that herein, oriented film has Retardation be wavelength 589nm value.

Diagonal position between Nicol crossed is configured birefringence body and uses white light source as back light In the case of, if the light that will transmit through Nicol crossed is defined as interference colours, the transmissivity of light is represented with formula (1).

I/I₀=1/2sin²(π·Re/λ)…(1)

Herein, I₀The intensity of the light of Nicol crossed is incident in expression, I represents to penetrate the light of Nicol crossed Intensity, Re represent birefringence body retardation.In this way, transmissivity (I/I₀) according to retardation, light wavelength and change, therefore Distinctive interference colours are observed according to the value of retardation.It is square expression by sin shown in for example above-mentioned formula (1) of the transmissivity of light Function, as shown in Figure 1, forming the upper and lower repeatedly figure of intensity in transmission.Herein, Rx/ (Re/Rx) is equivalent to the transmission in wavelength Rx The interval (nm) repeatedly of intensity.Therefore, Ry/ (Rx/ (Re/Rx)) is represents that there are several transmissions are strong between half breadth Ry The index repeatedly of degree.Intensity in transmission is repeatedly more between half breadth Ry, can more inhibit to observe on display picture Rainbow spot.

Rx is preferably more than 600nm and below 780nm.Rx is preferably more than 630nm, more preferably more than 635nm, into one Step is more preferably more than 640nm, particularly preferably more than 645nm.In addition, the upper limit is preferably below 780nm, is more preferably Below 700nm and then preferably below 680nm.When Rx is more than 630nm, it can more brightly be displayed in red, ensure colour gamut Extensively, therefore preferably.It, can be compared with the light in the easy visual region of multi output, therefore preferably during for below 780nm.

Half breadth Ry is preferably below 180nm, more preferably below 150nm, further preferably below 120nm, spy It You Xuanwei not below 100nm.If half breadth is big, the light ingredient in orange domain becomes more, becomes difficult to show purely red, therefore The value of Ry is preferably below 180nm.The lower limit of Ry is preferably more than 8nm, more preferably more than 15nm, further preferably 20nm Above, it is particularly preferably more than 25nm.

And then Bx will be set as less than the wavelength of the summit at peak existing for the wavelength region of 495nm in 400nm, incited somebody to action Half breadth be set as By, by 495nm less than the wavelength of the summit at peak existing for the wavelength region of 600nm be set as Gx, When half breadth is set as Gy, By/ (Bx/ (Re/Bx)) for more than 0.55 and/or Gy/ (Gx/ (Re/Gx)) be preferably 0.55 with On.More preferable By/ (Bx/ (Re/Bx)) is more than 0.55, and Gy/ (Gx/ (Re/Gx)) is more than 0.55.It is more preferably More than 0.60, it is more preferably more than 0.65, be even more preferably more than 0.7, is particularly preferably more than 0.75, most preferably It is more than 0.8.When being more than 0.55, the generation of rainbow spot can be further suppressed, therefore preferably.Although the higher the better for these values, But from the viewpoint of the filming of oriented film, the wide colour gamut of liquid crystal display device, preferably less than 10, more preferably 7 Below, it is even more preferably less than 5, is particularly preferably less than 3.

In the same manner as above-mentioned Ry/ (Rx/ (Re/Rx)), Bx/ (Re/Bx) be equivalent to wavelength Bx intensity in transmission repeatedly Interval (nm), By/ (Bx/ (Re/Bx)) for represent there are the indexs repeatedly of several intensity in transmissions between half breadth By. In addition, Gx/ (Re/Gx) is equivalent at the interval (nm) repeatedly of the intensity in transmission of wavelength Gx, Gy/ (Gx/ (Re/Gx)) is represents There are the indexs repeatedly of several intensity in transmissions between half breadth Gy.Half breadth By, Gy it is respective between transmission it is strong That spends is repeatedly more, can more further suppress the rainbow spot observed on display picture.

Bx for 400nm less than 495nm, Gx is preferably 495nm less than 600nm.Half breadth By is preferred For below 100nm, more preferably below 70nm, further preferably below 60nm, particularly preferably below 50nm.Half breadth The lower limit of By be preferably more than 5nm, more preferably more than 8nm, further preferably more than 10nm, particularly preferably 12nm with On.If less than 5nm, become easily to generate iris color spot, therefore not preferably.

Half breadth Gy is preferably below 150nm, more preferably below 120nm, further preferably below 100nm, spy It You Xuanwei not below 90nm.The lower limit of half breadth Gy is preferably more than 7nm, more preferably more than 10nm, is more preferably More than 12nm, particularly preferably more than 15nm.If less than 5nm, become easily to generate iris color spot, therefore not preferably.

It should be noted that Bx is preferably more than 430nm and below 470nm.Gx be preferably more than 510nm and 560nm with Under.

As shown in Figure 1, for the figure of transmissivity, intensity in transmission is up and down repeatedly.As shown in Figure 1, long wavelength region and shortwave Long region is compared, repeatedly between be separated with elongated tendency, therefore from the viewpoint of ensuring that colour gamut is wide, having the half value with each peak In the liquid crystal display device of the white light source of width By, Gy, Ry narrow luminescent spectrum, particularly meet Ry/ (Rx/ (Re/ Rx)) situation for more than 0.55 feature has the feelings for becoming to meet condition than By/ (Bx/ (Re/Bx)), Gy/ (Gx/ (Re/Gx)) The tightened up tendency of condition.Therefore, among By/ (Bx/ (Re/Bx)), Gy/ (Gx/ (Re/Gx)), Ry/ (Rx/ (Re/Rx)), especially It is important that the feature that the value for meeting Ry/ (Rx/ (Re/Rx)) is more than 0.55.

The oriented film used in polaroid protective film is as long as the feature that Ry/ (Rx/ (Re/Rx)) is more than 0.55 is met It is not particularly limited, preferably the retardation with 3000~30000nm.When retardation is less than 3000nm, protected as polarizer In the case of cuticula use, when having from inclined direction in interference colours, cannot ensure the worry of good visuality.Preferably The lower limiting value of retardation is 4500nm, then preferred lower limiting value is 5000nm, preferred lower limiting value is 6000nm, further Preferred lower limiting value is 8000nm, lower limiting value even more preferably is 10000nm.

On the other hand, even if using the oriented film with the retardation more than 30000nm, also not only substantially cannot Further visual improvement, and the thickness of film also becomes relatively thicker, and the treatability as industrial materials reduces, Therefore not preferably.

It should be noted that for retardation, refractive index and the thickness of biaxially oriented can be measured to be obtained, can also be made It is filled with this commercially available automatic double refraction determinings of KOBRA-21ADH (Oji Scientific Instruments Co., Ltd.) It puts to be obtained.Retardation is the value in wavelength 589nm.

For the oriented film used as polaroid protective film, it can use and be selected from by polyester resin, makrolon Resin, polystyrene resin, syndiotactic polystyrene resin, polyether-ether-ketone resin, polyphenylene sulfide, cyclic olefin resins, liquid crystal Property fluoropolymer resin and cellulose-based resin in one or more of group for forming of resin obtained from addition liquid-crystal compounds into Row manufacture.Therefore, oriented film can be thin in polyester film, polycarbonate film, polystyrene film, syndiotactic polytyrene Annex solution in film, poly (ether ether ketone) film, PPS films, cycloolefin film, liquid-crystalline polymer film, cellulose-based resin Film obtained from brilliant compound.

The preferred material resin of oriented film is makrolon, polyester or syndiotactic polytyrene.These resin transparencies Excellent and thermo-mechanical property is also excellent, can be easy to control retardation by stretch process.For with poly terephthalic acid Glycol ester and the polyester that polyethylene naphthalate is representative, are relatively easy to even if intrinsic birefringence is big, film thickness is thin Big retardation is obtained, therefore preferably.Polyethylene terephthalate, polyethylene naphthalate can be common containing other It is polymerized to point, can also be the substance for being obtained by mixing other polyester resin such as polybutylene terephthalate (PBT).Particularly, gather Even if ethylene glycol terephthalate is in the polyester, intrinsic birefringence is also big, retardation can be kept high, and make the thickness of film It is thin, therefore preferably.

From the viewpoint of being further suppressed rainbow spot, preferably with the retardation of oriented film (retardation in face) and thickness side To the ratio of retardation (Rth) fall into the mode of specific range and controlled.Thickness direction retardation amount refers to, from thickness direction Section see 2 birefringence △ Nxz, △ Nyz during film be multiplied by film thickness d respectively obtained from retardation be averaged.In face The difference of retardation and thickness direction retardation amount is smaller, and the birefringent effect as caused by viewing angle more increases isotropism, because The variation of this retardation as caused by viewing angle becomes smaller.It is therefore contemplated that it becomes difficult to generate the iris as caused by viewing angle Color spot.The retardation of oriented film and the ratio (Re/Rth) of thickness direction retardation amount are preferably more than 0.200, are more preferably More than 0.500, it is more preferably more than 0.600.The ratio (Re/Rth) of above-mentioned retardation and thickness direction retardation amount is bigger, more It becomes difficult to generate the iris color spot as caused by viewing angle.Moreover, in complete uniaxiality (mono-symmetry) film, it is above-mentioned to prolong The ratio (Re/Rth) of amount and thickness direction retardation amount is 2.0 late.But with thin close to complete uniaxiality (mono-symmetry) Film has the significantly reduced worry of mechanical strength in the direction orthogonal with differently- oriented directivity, it is therefore necessary to it is noted that.Polyester film prolongs The ratio (Re/Rth) of amount and thickness direction retardation amount is preferably less than 2.0, more preferably less than 1.2, further preferably 1.0 late Below.

In the present invention, at least one preferably oriented film of polaroid protective film.Do not have to the configuration of the oriented film Be particularly limited to, be configured with the polarizer for being configured at incident light side (light source side), liquid crystal cells and be configured at emergent light side (can Depending on side) polarizer liquid crystal display device in the case of, be configured at the polarizer of the incident light side of the polarizer of incident light side Protective film, and/or the polaroid protective film for penetrating light emission side of polarizer for being configured at emergent light side are preferably oriented film.Upper In the case of position configuration oriented film other than stating, the polarized light property of liquid crystal cells will sometimes changed.Due to not preferred In the part for needing polarized light property using the macromolecule membrane of the present invention, therefore preferably as the polarizer of such specific position Protective film use.

The absorption axis direction of polarizer is preferably substantially parallel or substantially vertical with the slow-axis direction of oriented film.In this hair In bright, the absorption axis direction of polarizer is substantially parallel, substantially vertical with the slow-axis direction of oriented film, but substantially in parallel Configuration is easier to inhibit rainbow spot.From the easiness of industry manufacture, the absorption axis direction of polarizer and the slow axis of oriented film Direction is preferably substantially vertical relationship.Herein, it is substantially parallel refer to allow the autoparallel configuration of absorption axiss and slow axis preferably ± Less than 15 °, more preferably less than ± 10 °, it is less than ± 5 °, still more preferably less than ± 3 ° further preferred, even more preferably Less than ± 2 °, particularly preferably less than ± 1 ° of deviation.In a preferred embodiment, substantially parallel is substantial parallel. Herein, it is substantial parallel to refer to allow absorption axiss parallel with slow axis with the degree of deviation being inevitably generated.Herein, substantially It is vertical to refer to allow absorption axiss less than ± 15 ° preferred, less than ± 10 ° more preferable, further preferred from vertical configuration with slow axis Less than ± 5 °, still more preferably less than ± 3 °, even more preferably less than ± 2 °, particularly preferably less than ± 1 ° of deviation. In a preferred embodiment, substantially vertical is substantially perpendicular.Herein, it is substantially perpendicular to refer to allow inevitably The degree of the deviation of generation, absorption axiss are vertical with slow axis.The direction of slow axis can pass through molecularly oriented meter (such as Oji Scientific Instruments Co., Ltd. system, MOA-6004 types molecularly oriented meter) it is measured to be obtained.

IPS patterns, VA patterns liquid crystal display device in, usual visible side polarizer is with the absorption of visible side polarizer The direction of the axis mode parallel with picture level direction is configured, and light source side polarizer is with the direction of the absorption axiss of light source side polarizer The mode parallel with picture upper and lower directions is configured.

The type of the protective film of the light source side of visible side polarizer and the protective film of the visible side of light source side polarizer is appoints Meaning, it suitable can select to use as the film that protective film uses back and forth.From treatability and the easiness obtained Viewpoint is set out, such as it is preferable to use selected from by Triafol T (TAC) film, acrylic film and cycloolefin tree One in the groups of compositions such as membrane of lipoprotein (orbornene-based film), polypropylene film and film of polyolefin resin (such as TPX) Kind or more do not have birefringent film.

In one embodiment, the visible side of the light source side protective film of visible side polarizer and light source side polarizer is protected Film is preferably the optical compensating film with optical compensation function.Such optical compensating film can be according to each mode of liquid crystal It carries out suitable for selection, for example,：By being selected from by making liquid-crystal compounds (such as disc liquid-crystal compounds and/or birefringence Property compound) it is scattered in resin obtained from Triafol T, cyclic olefin resin (such as norbornene resin), propionyl Acetate resins, polycarbonate film resin, acrylic resin, styrene acrylonitrile copolymer resin, tree containing lactonic ring The optical compensating film that one or more of groups of compositions such as fat and vistanex containing imide obtain.

Optical compensating film can be commercially available, therefore can also be used suitable for selection.For example,：TN side " Wide View-EA " and " Wide View-T " (the Fujifilm Corporation systems) of the formula, " Wide of VA modes View-B " (Fujifilm Corporation systems), VA-TAC (KONICA MINOLTA, INC. system), " Zeonor Film " (Zeon Corporation systems), " ARTON " (JSR CORPORATION systems), " X-plate " (Nitto Denko Corp System) and " Z-TAC " (the Fujifilm Corporation systems) of IPS modes, " CIG " (Nitto Denko Corp's system), " P-TAC " (Okura Industrial Co., Ltd. system) etc..

The polarizer of the present invention has to be bonded at least one face of polarizer that iodine is infected on polyvinyl alcohol (PVA) etc. Structure obtained from polaroid protective film, random polarization piece protective film is preferably oriented film.In another polaroid protective film In, it is preferable to use TAC film, acrylic film, film free of birefringence, the optical compensation represented by orbornene-based film Film.

For the polarizer used in the present invention, for reflection-proof, anti-dazzle, inhibit the purpose of scratch, by various hard paintings Layer coating is also preferred form on the surface.Can also design hard conating, anti-reflection layer, low reflection layer, antiglare layer or by it The functional layer that is composed.

In addition, for the deterioration for inhibiting the optical functionals pigments such as iodine pigment, for oriented film, it is generally desirable to wavelength The light transmittance of 380nm is less than 20%.The light transmittance of 380nm is more preferable less than 15%, further preferred less than 10%, especially excellent Select less than 5%.When aforementioned light transmittance is less than 20%, being gone bad by UV-induced for optical functional pigment can be inhibited. It should be noted that transmissivity is that the plane of film is measured with vertical direction, can use spectrophotometer (such as Hitachi's U-3500 types) it is measured.

In order to which the transmissivity of the wavelength 380nm of oriented film is made to be less than 20%, it is generally desirable to ultra-violet absorber The thickness of type, concentration and film adjust.The ultra-violet absorber used in the present invention is well known substance.Make For ultra-violet absorber, organic system ultra-violet absorber and inorganic system's ultra-violet absorber can be enumerated, from the viewpoint of the transparency It sets out, preferably organic system ultra-violet absorber.As organic system ultra-violet absorber, enumerate BTA system, hexichol first can be enumerated Ketone system, cyclic imide base ester system etc. and combinations thereof are not particularly limited as long as the range of absorbance limited for the present invention.But It is, from the viewpoint of durability, particularly preferred enumerate BTA system, cyclic imide base ester system.It is ultraviolet two or more is applied in combination In the case of light absorbers, the ultraviolet light of each wavelength can be absorbed simultaneously, therefore can further improve ultraviolet radiation absorption effect Fruit.

As benzophenone series ultra-violet absorber, enumerate BTA system ultra-violet absorber, acrylic ultraviolet radiation absorption Agent, for example,：2- [2 '-hydroxyl -5 '-(methacryloxymethyl) phenyl] -2H- benzotriazole, 2- [2 '-hydroxyls Base -5 '-(methacryloxyethyl) phenyl] -2H- benzotriazole, 2- [2 '-hydroxyls -5 '-(methacryloxy third Base) phenyl] -2H- benzotriazole, 2,2 '-dihydroxy -4,4 '-dimethoxy-benzophenone, 2,2 ', 4,4 '-tetrahydroxy hexichol first Ketone, 2,4- di-t-butyls -6- (5- chlorobenzotriazole -2- bases) phenol, 2- (2 '-hydroxyl -3 '-tertiary butyl -5 '-aminomethyl phenyl) - 5- chlorobenzotriazoles, 2- (5- chlorine (2H)-benzotriazole -2- bases) -4- methyl -6- (tertiary butyl) phenol, 2,2 '-di-2-ethylhexylphosphine oxide (4- (1,1,3,3- tetramethyl butyls) -6- (2H- benzotriazole -2- bases) phenol etc..It is inhaled as cyclic imide base ester system ultraviolet light Agent is received, for example,：2,2 '-(1,4- phenylenes) bis- (4H-3,1- benzoxazine -4- ketone), 2- methyl -3,1- Ben Bing Evil Piperazine -4- ketone, 2- butyl -3,1- benzoxazine -4- ketone, 2- phenyl -3,1- benzoxazine -4- ketone etc..But it is not particularly limited in These.

In addition, other than ultra-violet absorber, contain in the range of the effect for not interfering the present invention except catalyst with Outer various additives are also preferred mode.As additive, for example,：Inorganic particle, heat resistance macromolecule Grain, alkali metal compound, alkaline earth metal compound, phosphorus compound, antistatic agent, photostabilizer, fire retardant, heat stabilizer, antioxygen Agent, anti-gelling agents, surfactant etc..In addition, in order to play the high transparency, contained substantially no in oriented film Grain is also preferred." containing substantially no particle " refers to：Such as in the case of inorganic particle, pass through x-ray fluorescence analysis It is below 50ppm when being quantified to inorganic elements, preferably below 10ppm, the particularly preferably following content of detection limit.

It is good with the cementability of polarizer in order to make and then for oriented film, sided corona treatment, coating can also be implemented Processing, flame treatment etc..

In the present invention, in order to improve the cementability with polarizer, preferably having in at least single side of oriented film will gather At least one kind of adhesive layer as principal component in ester resin, polyurethane resin or polyacrylics.Herein, " it is main into Point " refer to for form adhesive layer solid constituent in more than 50 mass % ingredient.The formation of the adhesive layer of the present invention The middle coating fluid used preferably comprises water-soluble or water dispersible copolymer polyester resin, acrylic resin and polyurethane resin In at least one kind of aqueous coating fluid.As these coating fluids, for example,：No. 3567927 bulletins of Japanese Patent No., No. 3589232 bulletins of Japanese Patent No., No. 3589233 bulletins of Japanese Patent No., Japanese Patent No. No. 3900191 bulletins, Japan Water solubility or water dispersible copolymer polyester resin solution, acrylic resin disclosed in No. 4150982 bulletin of patent etc. is molten Liquid, polyurethane resin solution etc..

Adhesive layer can obtain as follows：Aforementioned coating liquid is coated on to the single or double of longitudinal single axle drawn membrane Afterwards, it is dried at 100~150 DEG C and then is transversely stretched, so as to obtain.The coating weight of final adhesive layer Preferred administration is 0.05~0.20g/m².If coating weight is less than 0.05g/m², then do not filled with the obtained cementability of polarizer sometimes Point.On the other hand, if coating weight is more than 0.20g/m², then resistance to blocking reduces sometimes.It is easy to stick in the two-sided setting of oriented film When connecing layer, the coating weight of two-sided adhesive layer can be identical or different, can separately be set within the above range It is fixed.

In order to assign easy sliding, particle is preferably added in adhesive layer.Average grain diameter it is preferable to use particle is 2 μm Following particle.If the average grain diameter of particle, more than 2 μm, particle becomes easily to come off from coating.As in adhesive layer The particle contained, for example,：Titanium oxide, barium sulfate, calcium carbonate, calcium sulfate, silica, magnesia, talcum, kaolinite The inorganic particles such as soil, clay, calcium phosphate, mica, hectorite, zirconium oxide, tungsten oxide, lithium fluoride, calcirm-fluoride, polystyrene, The organic polymers system such as acrylic acid series, melamine series, benzocarbamidine amine system, silicon-type particle etc..They can individually be added Into adhesive layer, two or more can also be combined and added.

In addition, as the method being coated to coating fluid, well known method can be used.For example,：It reverses Roller coating method, gravure coating process, kiss-coating method, roller brush method, spray coating method, air knife coating method, bar rubbing method, tubular type scraper method Deng these methods can carry out alone or in combination.

It should be noted that the measure of the average grain diameter of above-mentioned particle is carried out by following methods.

Photo is shot to particle with scanning electron microscope (SEM), 2~5mm is reached with the size of 1 minimum particle Multiplying power, the maximum gauges (distance between farthest 2 points) of 300~500 particles is measured, using its average value as the grain that is averaged Diameter.

Hereinafter, the manufacturing method of oriented film is illustrated by taking polyester film as an example.Polyester film can be by usual The manufacturing method of polyester film manufactured.For example, following method：It will make polyester resin melting and extrusion molding At temperature of the No yield point polyester more than glass transition temperature for sheet, stretched along longitudinal direction using the speed difference of roller Afterwards, it is transversely stretched using stenter, and implements to be heat-treated.

Polyester film can be single axle drawn membrane, or biaxially oriented film, using biaxially oriented film as partially Piece protective film shake in use, even if from the surface of pellicular front, also can't see iris color spot, but when from inclined direction Sometimes observe iris color spot, thus preferably it is noted that.

If illustrating the film forming condition of polyester film, longitudinal drawing temperature, transverse drawing temperature are preferably 80~130 DEG C, particularly preferably 90~120 DEG C.Longitudinal stretching multiplying power is preferably 1.0~3.5 times, particularly preferably 1.0 times~3.0 times.Separately Outside, cross directional stretch multiplying power is preferably 2.5~6.0 times, particularly preferably 3.0~5.5 times.In order to control retardation for above-mentioned model It encloses, preferably controls the ratio of longitudinal stretching multiplying power and cross directional stretch multiplying power.If the difference of stretching ratio in length and breadth is too small, become difficult To improve retardation, therefore not preferably.In addition, it is also preferred reply on retardation is improved that draft temperature, which is set relatively low,. In next heat treatment, treatment temperature is preferably 100~250 DEG C, particularly preferably 180~245 DEG C.

In order to inhibit the variation of retardation, the uneven thickness of preferred film is small.From draft temperature, stretching ratio to film Uneven thickness brings big influence, from the viewpoint of uneven thickness, it is also preferred that the optimization of condition is filmed.If particularly Longitudinal stretching multiplying power is reduced to improve retardation, then longitudinal thickness unevenness is deteriorated sometimes.Longitudinal thickness unevenness is stretching again The specific range of certain of rate has the region for becoming excessively poor, it is therefore desirable that setting film forming condition after the range is detached from.

The uneven thickness of oriented film is preferably less than 5.0%, is more preferably less than 4.5%, still more preferably It is less than 4.0%, particularly preferably less than 3.0%.

As previously mentioned, in order to control the retardation of oriented film in particular range, it can be by being stretched again suitable for setting Rate, draft temperature, film thickness carry out.For example, stretching ratio is higher, draft temperature is lower, the thickness of film is thicker, more It is easy to get high retardation.On the contrary, stretching ratio is lower, draft temperature is higher, the thickness of film is thinner, more it is easy to get low Retardation.But if thickening the thickness of film, thickness direction retardation amount easily becomes larger.Therefore, it is desirable that film thickness Suitable for being set as aftermentioned range.It is further preferred, that on the basis of retardation is controlled, to physical property necessary to processing etc. It is studied to set final film forming condition.

The thickness of oriented film is arbitrary, preferably 15~300 μm of range, more preferably 15~200 μm of range. Even the film of the thickness less than 15 μm, the retardation of more than 3000nm can be also obtained in principle.But in such case Under, the anisotropy of the mechanical characteristic of film become significantly, become easily to crack, breakage etc., the reality as industrial materials It is significantly reduced with property.The lower limit of particularly preferred thickness is 25 μm.On the other hand, if the upper limit of the thickness of polaroid protective film surpasses 300 μm are crossed, then the thickness of polarizer will become blocked up, not preferably.Go out from the viewpoint of the practicability as polaroid protective film Hair, the upper limit of thickness is preferably 200 μm.The upper limit of particularly preferred thickness is 100 μm with common TAC film equal extent.

In addition, as the method that ultra-violet absorber is compounded into polyester film, well known method can be combined to use, Such as it can wait and be compounded by the following method：In advance using mixing extruder, by dry ultra-violet absorber and polymerization Masterbatch is made by mixing in raw material, will the defined masterbatch and polymer raw material mixing when film is film-made.

For the ultraviolet radiation absorption agent concentration of masterbatch at this time, in order to be uniformly dispersed ultra-violet absorber and economical Ground is compounded, and is preferably set to the concentration of 5~30 mass %.As the condition for making masterbatch, it is preferable to use mixing extruder, squeezing out Temperature is squeezes out 1~15 minute more than the fusing point of polyester raw material and at less than 290 DEG C of temperature.It can increase at 290 DEG C or more The reduction of ultra-violet absorber, in addition, the viscosity reduction of masterbatch becomes larger.Extrusion temperature, 1 minute hereinafter, ultra-violet absorber Uniform mixing become difficult.At this point it is possible to it is added as needed on stabilizer, hue adjustment agent, antistatic agent.

In addition, in the present invention, it is preferred to oriented film is made at least 3 layers or more of multilayered structure, and in film Interbed adds ultra-violet absorber.The polyester film that middle layer contains the 3-tier architecture of ultra-violet absorber specifically can be as follows It is made.Using as outer layer by the use of polyester particle individually, will be as the masterbatch containing ultra-violet absorber of middle layer It is mixed, after drying, is supplied in well known melting stacking extruder, by slit-shaped with defined ratio with the particle of polyester Mold be extruded as sheet, cooled and solidified on casting roll, so as to make non-stretched film.That is, use the extrusion of 2 or more Machine, 3 layers of manifold or interflow block (such as interflow block with square merging part), will be in the film layer of two outer layers of composition, composition The film layer of interbed is laminated, and 3 layers of piece is squeezed out from tube head, is cooled down on casting roll, so as to make non-stretched film.It needs Illustrate, in invention, foreign matter the reason of in order to become optics bad point, contained in Starting Material Polyester removes, and preferably exists High-precision filtration is carried out during melting extrusion.The filtering particle size of the filter material used in the high-precision filtration of molten resin is (initial Filter efficiency 95%) it is preferably less than 15 μm.More than 15 μm, if 20 μm or more of foreign matter removes the filtering particle size of filter material It goes easily to become inadequate.

[embodiment]

Hereinafter, the present invention is further illustrated with reference to embodiment, but the present invention is not limited by following embodiments, it can also It is subject in the range of it can be suitble to the purport of the present invention suitable for changing to implement, these are all contained in protection scope of the present invention In.It should be noted that physical property in following embodiment evaluation method is as follows.

(1) retardation (Re)

Retardation is the anisotropy (△ Nxy=| Nx-Ny |) and film by the refractive index of the orthogonal twin shaft on film The parameter that the product (△ Nxy × d) of thickness d (nm) defines, is to represent optical isotropism, anisotropic standard.Twin shaft The anisotropy (△ Nxy) of refractive index is obtained by the following method.Use molecularly oriented meter (Oji Scientific Instruments Co., Ltd.s system, MOA-6004 types molecularly oriented meter), the slow-axis direction of film is obtained, with slow-axis direction with The parallel mode of test sample long side is cut to the rectangle of 4cm × 2cm, as test sample.To the sample, pass through Ah Shellfish index meter (ATAGO corporations, NAR-4T, measure wavelength 589nm) be obtained orthogonal twin shaft refractive index (slow-axis direction Refractive index：Ny, the refractive index in the direction orthogonal with slow-axis direction：Nx) and the refractive index of thickness direction (Nz), by aforementioned twin shaft Anisotropy (△ Nxy) of the refractive index absolute value of the difference (| Nx-Ny |) as refractive index.For the thickness d (nm) of film, use Electric micrometer (Fine Liu off Corp., system, Miritoron 1245D) is measured, and is nm by unit conversion.According to folding Retardation (Re) is obtained in the product (△ Nxy × d) for penetrating the anisotropy (△ Nxy) of rate and the thickness d (nm) of film.

(2) measure of the luminescent spectrum of back light

Using Hamamatsu Photonics K.K. multichannel optical splitter PMA-12 to the liquid that is used in each embodiment The luminescent spectrum of the back light of crystal device is measured.Time for exposure is set as 20msec.

(3) rainbow spot is observed

From front and inclined direction, in the dark visually from each embodiment gained liquid crystal display device, about rainbow spot Generation whether there is, judgement it is as follows.

○：Rainbow spot is not observed

△：Slightly observe rainbow spot

×：Rainbow spot is not observed

(Production Example 1- polyester A)

It heats up to esterification reaction tank, at the time of reaching 200 DEG C, puts into 86.4 mass parts of terephthalic acid (TPA) and second two 64.6 mass parts of alcohol, while stirring antimony trioxide 0.017 mass parts of the input as catalyst, magnesium acetate 4 hydrate 0.064 Mass parts, 0.16 mass parts of triethylamine.Then, pressurization heating is carried out, is pressurizeed under conditions of gauge pressure 0.34MPa, 240 DEG C After esterification, esterification reaction tank is made to be restored to normal pressure, add 0.014 mass parts of phosphoric acid.And then it was warming up to 260 with 15 minutes DEG C, add 0.012 mass parts of trimethyl phosphate.Then after 15 minutes, decentralized processing is carried out with high pressure dispersing machine, after 15 minutes, Gained esterification reaction product is transplanted in polycondensation reaction tank, polycondensation reaction is carried out at 280 DEG C, under decompression.

After polycondensation reaction, processing is filtered with the NASLON filters that 95% cut-off diameter is 5 μm, from nozzle Strand form is extruded as, using having carried out filtration treatment (aperture in advance：Less than 1 μm) cooling water cooled down, cured, cut into Graininess.The inherent viscosity of gained pet resin (A) is 0.62dl/g, is contained substantially no nonactive Particle and internal precipitation particle.(it is abbreviated as PET (A) later.)

(Production Example 2- polyester B)

By dry ultra-violet absorber (2,2 '-(1,4- phenylenes) bis- (4H-3,1- benzoxazine -4- ketone) 10 mass Part, 90 mass parts of PET (A) (inherent viscosity 0.62dl/g) mixing for not containing particle, using mixing extruder, are contained The pet resin (B) of ultra-violet absorber.(being abbreviated as PET (B) later)

(Production Example 3- cementabilities are modified the preparation of coating fluid)

Ester exchange reaction and polycondensation reaction are carried out by conventional method, are prepared as dicarboxylic acid component (relative to dicarboxyl Sour component is whole) 46 moles of % of terephthalic acid (TPA), 46 moles of % and 5- sulfoisophthalic acids sodium of M-phthalic acid, 8 moles of %, The water of the composition of (relative to diol component entirety) ethylene glycol 50 moles of % and 50 moles of % of neopentyl glycol as diol component The dispersed copolymer polyester resin of alkali containing Sulfonic acid metal.Then, by 51.4 mass parts of water, 38 mass parts of isopropyl alcohol, normal-butyl After 5 mass parts of cellosolve, the mixing of 0.06 mass parts of nonionic surfactants, heating stirring is carried out, after reaching 77 DEG C, is added in Above-mentioned 5 mass parts of water dispersible alkali containing Sulfonic acid metal copolymer polyester resin, after continuing to stir to the block of resin and disappearing, by resin Aqueous dispersions are cooled to room temperature, and obtain the uniform water dispersible copolymer polyester resin liquid of 5.0 mass % of solid component concentration.Into And disperse aggregation silica dioxide granule (FUJI SILYSIA CHEMICAL LTD. systems, SILYSIA 310) 3 mass parts After 50 mass parts of water, the moisture of SILYSIA 310 is added in into above-mentioned 99.46 mass parts of water dispersible copolymer polyester resin liquid 0.54 mass parts of dispersion liquid add in 20 mass parts of water while stirring, obtain cementability and are modified coating fluid.

(polaroid protective film 1)

As PET (A) resin particle 90 mass parts of the base film middle layer raw material without particle and purple will be contained 10 mass parts of PET (B) resin particle of ultraviolet absorbers are carried out 6 hours at 135 DEG C after being dried under reduced pressure (1Torr), to extrusion Machine 2 (middle layer II layers use) supply, in addition, by conventional method by PET (A) it is dry and respectively to extruder 1 (I layers of outer layer and Outer layer III use) supply, it is dissolved at 285 DEG C.By 2 kinds of polymer respectively with the filter material of stainless steel sintered body (nominal filter essence 10 μm of particles 95% of degree end) it is filtered, it is laminated using 2 kind of 3 laminated stream block, from after tube head is extruded as sheet, is used Electrostatic application casting, which is wrapped on the casting cylinder of 30 DEG C of surface temperature, to be cooled and solidified, and makes non-stretched film.At this point, with I layers, II layers, the ratio of III layers of thickness become 10：80：10 mode adjusts the discharge rate of each extruder.

Then, by reverse roll method using dried coating weight as 0.08g/m²Mode by above-mentioned cementability be modified be coated with Liquid be applied to the non-stretched PET film it is two-sided it is upper after, dry 20 seconds at 80 DEG C.

The non-stretched film for being formed with coating layer is imported into tentering stretching-machine, while the end with fixture clamping film Portion while importeding into the hot wind region of 125 DEG C of temperature, is stretched to 4.0 times in the width direction.Then, it keeps stretching in width direction Amplitude, handled 10 seconds at 225 DEG C of temperature, and then 3.0% relaxation processes are carried out in width direction, obtain film thickness About 100 μm of uniaxial stretching PET film.The Re of gained film is 10300nm.

(polaroid protective film 2)

Change linear velocity and change the thickness of non-stretched film, in addition to this, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial stretching PET film that film thickness is about 80 μm.The Re of gained film is 8080nm.

(polaroid protective film 3)

Change linear velocity and change the thickness of non-stretched film, in addition to this, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial stretching PET film that film thickness is about 60 μm.The Re of gained film is 6060nm.

(polaroid protective film 4)

Change linear velocity and change the thickness of non-stretched film, in addition to this, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial stretching PET film that film thickness is about 40 μm.The Re of gained film is 4160nm.

(polaroid protective film 5)

Change linear velocity and change the thickness of non-stretched film, in addition to this, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial stretching PET film that film thickness is about 20 μm.The Re of gained film is 2050nm.

(polaroid protective film 6)

Change linear velocity and change the thickness of non-stretched film, in addition to this, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial stretching PET film that film thickness is about 150 μm.The Re of gained film is 15200nm.

Using polaroid protective film 1~6, as described later, liquid crystal display device is made.

(embodiment 1)

It is attached in a manner that the absorption axiss of polarizer are vertical with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 1 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 1.

By the visible side of BRAVIA KDL-40W920A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 1 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 2)

It is attached in a manner that the absorption axiss of polarizer are vertical with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 2 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 2.

By the visible side of BRAVIA KDL-40W920A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 2 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 1)

It is attached in a manner that the absorption axiss of polarizer are vertical with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 3 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 3.

By the visible side of BRAVIA KDL-40W920A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 3 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 2)

It is attached in a manner that the absorption axiss of polarizer are vertical with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 4 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 4.

By the visible side of BRAVIA KDL-40W920A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 4 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 3)

It is attached in a manner that the absorption axiss of polarizer are vertical with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 5 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 5.

By the visible side of BRAVIA KDL-40W920A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 5 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 3)

It is attached in a manner that the absorption axiss of polarizer are vertical with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 6 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 6.

By the visible side of BRAVIA KDL-40W920A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 6 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 4)

By the visible side of BRAVIA KDL-42W900B of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 1 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 5)

By the visible side of BRAVIA KDL-42W900B of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 2 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 6)

By the visible side of BRAVIA KDL-42W900B of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 3 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 7)

By the visible side of BRAVIA KDL-42W900B of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 4 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 4)

By the visible side of BRAVIA KDL-42W900B of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 5 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 8)

By the visible side of BRAVIA KDL-42W900B of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 6 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 9)

By the visible side of BRAVIA KDL-55W900A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 1 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 5)

By the visible side of BRAVIA KDL-55W900A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 2 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 6)

By the polarizer of the visible side of the BRAVIAKDL-55W900A of Sony Corporation and light source side with polyester Film becomes is replaced into above-mentioned polarizer 3 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 7)

By the visible side of BRAVIA KDL-55W900A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 4 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(comparative example 8)

By the visible side of BRAVIA KDL-55W900A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 5 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 10)

By the visible side of BRAVIA KDL-55W900A of Sony Corporation and the polarizer of light source side with poly- Ester film becomes is replaced into above-mentioned polarizer 6 with the mode of liquid crystal opposite side (distal end), and liquid crystal display device is made.

(embodiment 11)

It is attached in a manner that the absorption axiss of polarizer are parallel with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 2 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 2A replaces polarizer 2 using polarizer 2A, in addition to this, operates similarly to Example 2, liquid crystal display device is made.

(embodiment 12)

It is attached in a manner that the absorption axiss of polarizer are parallel with the slow axis of film in the unilateral side of the polarizer comprising PVA and iodine Polaroid protective film 1 in its attached TAC film of opposite face paste (80 μm of Fujifilm Corporation systems, thickness), is made partially Tabula rasa 1A replaces polarizer 1 using polarizer 1A, in addition to this, operates similarly to Example 1, liquid crystal display device is made.

The result that the observation of rainbow spot is measured to the liquid crystal display device obtained in each embodiment is shown in following table 1.

[table 1]

Industrial availability

The liquid crystal display device of the present invention has wide colour gamut, and can be ensured that in arbitrary viewing angle iris color spot The good visuality being suppressed significantly is generated, industrial availability is high.

Claims

1. a kind of liquid crystal display device, with back light, 2 polarizers and the liquid being configured between 2 polarizers Brilliant unit,

Polarisation of at least one of 2 polarizers polarizer to be laminated with oriented film in at least single side of polarizer Plate,

The back light is in 400nm less than 495nm, 495nm less than 600nm and more than 600nm and 780nm Following each wavelength region is respectively provided with the summit of luminescent spectrum,

Rx will be set as in the wavelength of the summit at peak existing for the wavelength region of more than 600nm and below 780nm, set half breadth For Ry, when the retardation that the oriented film has is set as Re,

Ry/ (Rx/ (Re/Rx)) is more than 0.55,

The slow axis of the absorption axiss of the polarizer and the oriented film be it is substantially parallel or substantially vertical, it is herein, substantially parallel Refer to that autoparallel with the slow axis state of absorption axiss deviates ± 15 ° hereinafter, substantially vertical refer to absorption axiss and slow axis from vertical shape State deviates less than ± 15 °.

2. liquid crystal display device according to claim 1, wherein, the back light 400nm less than 495nm, 495nm are respectively provided with luminescent spectrum less than each wavelength region of 600nm and more than 600nm and below 700nm Summit.

3. liquid crystal display device according to claim 1 or 2, wherein, the retardation of the oriented film for 3000nm with Above and less than 10000nm.

4. liquid crystal display device according to claim 1 or 2, wherein, the retardation of the oriented film for 3000nm with Upper and below 8080nm.

5. liquid crystal display device according to claim 1 or 2, wherein, by the 400nm less than 495nm's The wavelength of the summit at peak existing for wavelength region is set as Bx, half breadth is set as By,

In the 495nm Gx, half value is wide will be set as less than the wavelength of the summit at peak existing for the wavelength region of 600nm When degree is set as Gy,

By/ (Bx/ (Re/Bx)) is more than 0.55, and

Gy/ (Gx/ (Re/Gx)) is more than 0.55.

6. liquid crystal display device according to claim 1 or 2, wherein, the Rx is more than 630nm.

7. liquid crystal display device according to claim 1 or 2, wherein, the Ry is below 180nm.

8. liquid crystal display device according to claim 1 or 2, wherein, the Rx is more than 635nm.

9. liquid crystal display device according to claim 1 or 2, wherein, the Rx is more than 640nm.

10. liquid crystal display device according to claim 1 or 2, wherein, the Rx is more than 645nm.