CN106796371B

CN106796371B - Liquid crystal display device

Info

Publication number: CN106796371B
Application number: CN201680002001.7A
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: 2018-02-09
Anticipated expiration: 2036-03-02
Also published as: CN108169955A; JP6032385B1; TWI691763B; KR101813438B1; CN108169955B; TW201636704A; WO2016140235A1; CN106796371A; KR20160138311A; JPWO2016140235A1

Abstract

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

Description

Liquid crystal display device

Technical field

The present invention relates to liquid crystal display device.Specifically, it is related to and inhibits liquid crystal display device caused by iris color spot.

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 LCD slimming, it is desirable to Polarizer it is thin layer.But make if this The thickness of the TAC film used as diaphragm 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 the problem of observing iris color spot be present.

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 used as polarization as back light using the oriented polyester films with certain retardation Piece diaphragm (patent document 4).

Prior art literature

Patent document

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

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

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

Patent document 4：WO2011/162198

The content of the invention

Problems to be solved by the invention

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

On the other hand, because colour gamut in recent years expands desired raising, the luminescent spectrum of white light source is developed in R (red), G (green), B (indigo plant) each wavelength region have the liquid crystal display device of clear and definite peak shape respectively.For example, developing makes The liquid crystal display device corresponding to the wide colour gamut of the various light sources such as following light source：Make use of technology of quantum dots white light source, Used has the fluorophor of clear and definite glow peak and the fluorophor of blue led based on exciting light in R (red), G (green) region 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.By profit 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 eye can be reproduced More than 60% color of recognizable spectrum.These white light sources have used YAG systems yellow fluorophor than conventional including White light-emitting diode light source peak half breadth it is narrow, and new discovery using the oriented film with retardation as partially The polaroid protective film of the member of formation of tabula rasa in use, produce rainbow spot sometimes according to the species of light source.

The problem of the present invention is, there is provided a kind of following liquid crystal display device：Using with each ripple 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 in the member of formation as Polarizer Polaroid protective film use oriented film in the case of, the generation of rainbow spot is also suppressed.

The solution used to solve the problem

The representational present invention is as follows.

Item 1.

A kind of liquid crystal display device, it has back light, 2 Polarizers and is configured between foregoing 2 Polarizers Liquid crystal cells,

At least one Polarizer in foregoing 2 Polarizers is laminated with the inclined of oriented film at least one side in polarizer Tabula rasa,

Backlight light source in 400nm less than 495nm, 495nm less than 600nm and more than 600nm and Below 780nm each wavelength region has the summit of luminescent spectrum respectively,

Rx, half value is wide will be set in the wavelength of the summit at peak existing for more than 600nm and below 780nm wavelength region When degree is set to Ry, the retardation that foregoing oriented film has is set into 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 has the summit of luminescent spectrum less than 600nm and more than 600nm and below 700nm each wavelength region respectively.

Item 3.

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

In foregoing 495nm Gx will be set to less than the wavelength of the summit at peak existing for 600nm wavelength region, by partly When value width is set to 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 any one of item 1~3, wherein, foregoing Rx is more than 630nm.

Item 5.

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

The effect of invention

The liquid crystal display device of the present invention has wide colour gamut, and is able to ensure that in any viewing angle iris color spot Produce the good visuality being suppressed significantly.

Brief 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.

Example when Fig. 2 shows multiple peaks to be present in single wavelength region.

Example when Fig. 3 shows multiple peaks to be present in single wavelength region.

Example when Fig. 4 shows multiple peaks to be present in single wavelength region.

Example when Fig. 5 shows multiple peaks to be present in single wavelength region.

Embodiment

Generally, liquid crystal display device is with the side (visible side) from the relative side with back light towards display image It is made up of successively rear module, liquid crystal cells and front module.Rear module and front module generally by transparency carrier, be formed at The Polarizer of the nesa coating of liquid crystal cells side surface side opposite with its is configured at is formed.Herein, for Polarizer, In rear module, configure in the side relative with back light, in front module, configure (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 beyond 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 for reflecting orthogonal to that rectilinearly polarized light can be enumerated.As Reflection-type Polarizer, for example, Sumitomo 3M Limited DBEF (registration mark) (Dua l can be suitably used Brightness Enhancement Film) series luminance brightness-improving film.It should be noted that reflection-type Polarizer is usual Configured in a manner of 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 with 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 the sidelight mode using light guide plate, reflecting plate etc. as 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 has the summit of luminescent spectrum less than 600nm and more than 600nm and below 780nm each wavelength region respectively White light source.In one embodiment, light source preferably 400nm less than 495nm, 495nm less than 600nm and more than 600nm and below 700nm each wavelength region have the summit of luminescent spectrum respectively.In known CIE chromaticity diagram Blueness, green, each spike length of red of definition are respectively 435.8nm (blueness), 546.1nm (green) and 700nm (red Color).Foregoing 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, used it is glimmering with glow peak respectively in R (red), G (green) region based on exciting light 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 species of light source is not particularly limited, as long as described above, in 400nm Have respectively less than 600nm and more than 600nm and below 780nm each wavelength region 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, can exemplify 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 can exemplify 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 preferable upper limit, lower limit.Under if half breadth is less than preferably Limit value, then become easily to produce iris color spot, need to thicken oriented film to improve the retardation of oriented film (Re), show Device is difficult to be thinned, therefore not preferred.If half breadth exceedes the preferable upper limit, become to be 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 495nm wavelength region, 495nm less than 600nm wavelength region or In the case of multiple peaks being present in any wavelength region in more than 600nm and below 780nm wavelength region, consider as follows. In the case where peak independently is in multiple peaks, the half breadth at peak intensity highest peak is preferably scope described later.And then For other peaks of more than 70% intensity with highest peak intensity, half breadth is similarly more preferably model described later Enclose.One for the shape with multiple overlap of peaks independent peak, the peak intensity highest in it can directly determine 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 With in the case of the region of 1/2 intensity for reaching peak intensity, using the plurality of peak as entirety, 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 peak intensity highest point in multiple peaks as summit.In Fig. 2~5, with double Half breadth when representing multiple peaks to be present in from 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 and is considered as 1 independent peak.It is more for so having One independent peak of the shape of individual overlap of peaks, the half breadth at the peak intensity highest peak in it can directly determine multiple peaks In the case of, the half breadth using its half breadth as independent 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 Fig. 3 situation, peak A and peak B is concentrated and is considered as independent 1 Peak, its 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 and is considered as 1 independent peak.For with multiple peaks One independent peak of overlapping shape, the feelings of the half breadth at the peak intensity highest peak in it can directly determine multiple peaks Under condition, its half breadth is used.Therefore, in the case of fig. 5, its 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 495nm wavelength region, 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 below 780nm wavelength region Peak is preferably in separate relation.Particularly, there is highest peak intensity less than 600nm wavelength region in 495nm Exist in the peak of degree and wavelength region between the peak that more than 600nm and below 780nm region have highest peak intensity strong Spend to have less than the 1/3 of the peak intensity at the peak of highest peak intensity area in more than 600nm and below 780nm wavelength region Domain, it is preferable 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 in the wavelength of the summit at peak existing for more than 600nm and below 780nm wavelength region When degree is set to Ry, the retardation having as the oriented film that polaroid protective film uses is set into 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 incline direction During device, the generation of rainbow spot can be suppressed, 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 It is the higher the better, but filming from oriented film, from the viewpoint of 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 configures 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 incided in expression, I represents to pass through the light of Nicol crossed Intensity, Re represent birefringence body retardation.So, 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 strong to represent to exist between half breadth Ry several transmissions The index repeatedly of degree.Intensity in transmission is repeatedly more between half breadth Ry, can more suppress to observe in display picture Rainbow spot.

Rx is preferably more than 600nm and below 780nm.Rx is preferably more than 630nm, more preferably more than 635nm, enters 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 show red, ensure colour gamut Extensively, therefore preferably.For below 780nm when, can be compared with the light in the easy visual region of multi output, therefore preferably.

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

And then Bx will be set to less than the wavelength of the summit at peak existing for 495nm wavelength region in 400nm, incited somebody to action Half breadth be set to By, by 495nm less than the wavelength of the summit at peak existing for 600nm wavelength region be set to Gx, When half breadth is set into Gy, By/ (Bx/ (Re/Bx)) be more than 0.55, and/or Gy/ (Gx/ (Re/Gx)) be preferably 0.55 with On.More preferably 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 For more than 0.8.For more than 0.55 when, can further suppress the generation of rainbow spot, therefore preferably.Although these values are the higher the better, But from the viewpoint of the wide colour gamut of the filming, liquid crystal display device from oriented film, 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) equivalent to wavelength Bx intensity in transmission repeatedly Interval (nm), By/ (Bx/ (Re/Bx)) is to represent the indexs repeatedly of several intensity in transmissions between half breadth By be present. In addition, intervals (nm) repeatedly of the Gx/ (Re/Gx) equivalent to the intensity in transmission in wavelength Gx, Gy/ (Gx/ (Re/Gx)) is expression The index repeatedly of several intensity in transmissions between half breadth Gy be present.Half breadth By, Gy it is respective between transmission it is strong That spends is repeatedly more, more can further suppress the rainbow spot observed in display picture.

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

Half breadth Gy is preferably below 150nm, more preferably below 120nm, more preferably below 100nm, spy You Xuanwei not below 90nm.Half breadth Gy lower limit is preferably more than 7nm, more preferably more than 10nm, is more preferably More than 12nm, particularly preferably more than 15nm.If being less than 5nm, become easily to produce iris color spot, thus it is not preferred.

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, there is 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 value for meeting Ry/ (Rx/ (Re/Rx)) is more than 0.55 feature.

As long as the oriented film used in polaroid protective film meet Ry/ (Rx/ (Re/Rx)) be more than 0.55 feature just 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, have when from incline direction in interference colours, cannot ensure good visual worry.Preferably The lower limit of retardation is 4500nm, then preferable lower limit is 5000nm, preferred lower limit is 6000nm, further Preferable lower limit is 8000nm, lower limit 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 it is not preferred.

It should be noted that for retardation, refractive index and the thickness of biaxially oriented can be determined to obtain, can also be made Filled with this commercially available automatic double refraction determinings of KOBRA-21ADH (Oji Scientific Instruments Co., Ltd.) Put to obtain.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 add liquid-crystal compounds obtained from one or more of group for forming of resin enter 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 crystallization compound.

The preferable material resin of oriented film is makrolon, polyester or syndiotactic polytyrene.These resin transparencies Excellent and thermo-mechanical property is also excellent, can be easily controlled retardation by stretch process.For with poly terephthalic acid Glycol ester and the polyester that PEN is representative, are relatively easy to even if intrinsic birefringence is big, film thickness is thin Big retardation is obtained, therefore preferably.Polyethylene terephthalate, PEN can be common containing other It is polymerized to point, can also is the material 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 makes the thickness of film It is thin, therefore preferably.

From the viewpoint of further suppression rainbow spot, preferably with the retardation (retardation in face) of oriented film and thickness side To the ratio of retardation (Rth) fall into the mode of specific scope and be 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 Retardation is poor smaller with thickness direction retardation amount, and the birefringent effect as caused by viewing angle more increases isotropism, because The change of this retardation as caused by viewing angle diminishes.It is therefore contemplated that become to be difficult to produce 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 Become to be difficult to produce 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, there is 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, more preferably 1.0 late Below.

In the present invention, at least one of polaroid protective film is preferably oriented film.Configuration to the oriented film does not have 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 Diaphragm, 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 beyond stating, the polarized light property of liquid crystal cells will sometimes changed.Due to not preferred The part of polarized light property is being needed using the macromolecule membrane of the present invention, therefore preferably as the Polarizer of such ad-hoc location Diaphragm use.

Absorption direction of principal axis and the slow-axis direction of oriented film of polarizer are preferably almost parallel or substantially vertical.In this hair In bright, the absorption direction of principal axis of polarizer is almost parallel, substantially vertical with the slow-axis direction of oriented film, but substantially in parallel Configuration is easier to suppress rainbow spot.From the easiness of industry manufacture, the slow axis for absorbing direction of principal axis and oriented film of polarizer Direction is preferably substantially vertical relation.Herein, it is almost parallel refer to allow the autoparallel configuration of absorption axiss and slow axis preferably ± Less than 15 °, more preferably less than ± 10 °, further preferably less than ± 5 °, still more preferably less than ± 3 °, even more preferably Less than ± 2 °, particularly preferably less than ± 1 ° of deviation.It is almost parallel to be substantial parallel in a preferable embodiment. Herein, the degree of the substantial parallel deviation for referring to be inevitably generated allows absorption axiss parallel with slow axis.Herein, substantially It is vertical to refer to allow absorption axiss preferred less than ± 15 °, more preferably less than ± 10 °, 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 preferable embodiment, substantially vertical is substantial orthogonality.Herein, substantial orthogonality refers to allow inevitably The degree of caused deviation, 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 obtain.

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 axle mode parallel with picture level direction configures, and light source side Polarizer is with the direction of the absorption axiss of light source side Polarizer The mode parallel with picture above-below direction configures.

The species of the diaphragm of the light source side of visible side polarizer and the diaphragm of the visible side of light source side polarizer is to appoint Meaning, it can suitably select to use to be used as the film that diaphragm uses in the past.From treatability and the easiness obtained Viewpoint is set out, such as preferably using selected from by Triafol T (TAC) film, acrylic film and cycloolefin tree One in the groups of composition such as membrane of lipoprotein (ENB system film), polypropylene film and film of polyolefin resin (such as TPX) Do not have birefringent film more than kind.

In one embodiment, the visible side of the light source side diaphragm 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 Suitably selected, such as can be enumerated：By 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 1 kind of optical compensating film derived above in the group of composition such as fat and vistanex containing imide.

Optical compensating film can be commercially available, therefore can also suitably be selected and be used.Such as it can enumerate：TN side " Wide View-EA " and " Wide View-T " (Fujifilm Corporation systems), " Wide of VA modes of formula 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 for the polarizer that iodine is infected with polyvinyl alcohol (PVA) etc. Structure obtained from polaroid protective film, random polarization piece diaphragm is preferably oriented film.In another polaroid protective film In, preferably using TAC film, acrylic film, the film free of birefringence represented by ENB system film, optical compensation Film.

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

In addition, for the deterioration for suppressing the optical functional pigments such as iodine pigment, for oriented film, it is generally desirable to wavelength 380nm light transmittance is less than 20%.It is 380nm light transmittance more preferably less than 15%, further preferred less than 10%, especially excellent Select less than 5%.When foregoing light transmittance is less than 20%, being gone bad by UV-induced for optical functional pigment can be suppressed. 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 that the wavelength 380nm of oriented film transmissivity is less than 20%, it is generally desirable to ultra-violet absorber The thickness of species, concentration and film is suitably adjusted.The ultra-violet absorber used in the present invention is known material.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 Set 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, as long as the scope of the absorbance limited for the present invention is just not particularly limited.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 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, such as can enumerate：2- [2 '-hydroxyl -5 '-(methacryloxymethyl) phenyl] -2H- BTAs, 2- [2 '-hydroxyls Base -5 '-(methacryloxyethyl) phenyl] -2H- BTAs, 2- [2 '-hydroxyls -5 '-(methacryloxy third Base) phenyl] -2H- BTAs, 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-the 3 '-tert-butyl group -5 '-aminomethyl phenyl) - 5- chlorobenzotriazoles, 2- (5- chlorine (2H)-BTA -2- bases) -4- methyl -6- (tert-butyl group) phenol, 2,2 '-di-2-ethylhexylphosphine oxide (4- (1,1,3,3- tetramethyl butyls) -6- (2H- BTA -2- bases) phenol etc..Inhaled as cyclic imide base ester system ultraviolet Agent is received, such as can be enumerated：2,2 '-(1,4- phenylenes) double (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, in addition to ultra-violet absorber, contain in the range of the effect without prejudice to the present invention except catalyst with Outer various additives are also preferable mode.As additive, such as can enumerate：Inorganic particle, heat resistance macromolecule Grain, alkali metal compound, alkaline earth metal compound, phosphorus compound, antistatic additive, 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 preferable." 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, the content below preferably below 10ppm, particularly preferred test limit.

And then for oriented film, in order that it is good with the cementability of polarizer, 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 have and will gather at least one side of oriented film 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 form the composition of more than the 50 mass % in the solid constituent of adhesive layer.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, such as can enumerate：No. 3567927 publications of Japanese Patent No., No. 3589232 publications of Japanese Patent No., No. 3589233 publications of Japanese Patent No., Japanese Patent No. No. 3900191 publications, Japan Water solubility or water dispersible copolymer polyester resin solution, acrylic resin disclosed in No. 4150982 publication 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 obtains.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 the cementability of the polarizer with obtaining does not fill 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 separately can be set within the above range with identical or different It is fixed.

In order to assign easy sliding, particle is preferably added in adhesive layer.It is preferred that the use of the average grain diameter of particulate it 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, such as can enumerate：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 polymer 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, known method can be used.Such as it can enumerate：Reverse Roller rubbing method, gravure coating process, kiss-coating method, roller brush method, spraying process, air knife coating method, bar rubbing method, tubular type doctor blade method Can individually or combination is carried out Deng, these methods.

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, determine the maximum gauge (distance between farthest 2 points) of 300~500 particles, be averaged value as the grain that is averaged Footpath.

Hereinafter, the manufacture method of oriented film is illustrated by taking polyester film as an example.Polyester film can be by usual The manufacture method of polyester film manufactured.Such as following method can be enumerated：Polyester resin melting and extrusion molding will be made For sheet No yield point polyester more than glass transition temperature at a temperature of, using roller speed difference along longitudinal direction stretched Afterwards, transversely stretched using stenter, and implement to be heat-treated.

Polyester film can be single axle drawn membrane, or biaxially oriented film, using biaxially oriented film as partially Piece diaphragm shake in use, even if from the surface of pellicular front, also can't see iris color spot, but when from incline direction Sometimes it was observed that 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.It is above-mentioned model in order to which retardation is controlled Enclose, preferably control the ratio of longitudinal stretching multiplying power and cross directional stretch multiplying power.If stretching ratio in length and breadth is poor too small, become difficult To improve retardation, thus it is not preferred.In addition, it is also preferable reply on retardation is improved that draft temperature, which is set relatively low,. In ensuing heat treatment, treatment temperature is preferably 100~250 DEG C, particularly preferably 180~245 DEG C.

In order to suppress 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 is uneven sometimes is deteriorated.Longitudinal thickness inequality is in stretching times The specific scope of certain of rate has the region for becoming excessively poor, it is therefore desirable that setting film forming condition after the scope is departed from.

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

As it was previously stated, in order to which the retardation of oriented film is controlled in particular range, can be by suitably setting stretching times Rate, draft temperature, the thickness of film are carried out.For example, stretching ratio is higher, draft temperature is lower, the thickness of film is thicker, more It is readily obtained high retardation.On the contrary, stretching ratio is lower, draft temperature is higher, the thickness of film is thinner, more it is readily obtained low Retardation.But if thickening the thickness of film, thickness direction retardation amount easily becomes big.Therefore, it is desirable that film thickness Suitably it is set as scope described later.It is further preferred, that on the basis of retardation is controlled, to physical property necessary to processing etc. Studied to set final film forming condition.

The thickness of oriented film is arbitrary, preferably 15~300 μm of scope, more preferably 15~200 μm of scope. Even the film of the thickness less than 15 μm, more than 3000nm retardation 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 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 practicality 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, known method can be combined to use, Such as it can by the following method wait and be compounded：Mixing extruder is used in advance, by dry ultra-violet absorber and polymerization Masterbatch is made by mixing in raw material, mixes the defined masterbatch and polymer raw material when film is film-made.

For the ultraviolet radiation absorption agent concentration of now masterbatch, in order that ultra-violet absorber is uniformly dispersed and economy Ground is compounded, and is preferably set to 5~30 mass % concentration.As the condition for making masterbatch, preferably using mixing extruder, extruding Temperature for polyester raw material fusing point more than and less than 290 DEG C of temperature under extrude 1~15 minute.It can increase when more than 290 DEG C The reduction of ultra-violet absorber, in addition, the viscosity of masterbatch, which reduces, becomes big.Extrusion temperature, less than 1 minute, 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 additive.

In addition, in the present invention, it is preferred to oriented film to be made at least more than 3 layers of sandwich construction, and in film Interbed adds ultra-violet absorber.The polyester film that the 3-tier architecture of ultra-violet absorber is contained in intermediate layer specifically can be as follows Made.Using as outer layer by the use of polyester particle individually, the masterbatch containing ultra-violet absorber in intermediate layer will be used as Mixed, after drying, be supplied in known melting stacking extruder, by slit-shaped with defined ratio with the particle of polyester Mould be extruded as sheet, cooled and solidified on casting roll, so as to make non-stretched film.That is, using the extrusion of more than 2 Machine, 3 layers of manifold or interflow block (such as interflow block with square merging part), by the film layer of two outer layers of composition, composition The film layer stacking of interbed, 3 layers of piece is extruded from tube head, is cooled down on casting roll, so as to make non-stretched film.Need Illustrate, in invention, in order to be removed as foreign matter the reason for optics bad point, contained in Starting Material Polyester, preferably exist 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 more than 20 μm of foreign matter removes the filtering particle size of filter material Go easily to become insufficient.

[embodiment]

Hereinafter, the present invention is further illustrated with reference to embodiment, but the present invention is not limited by following embodiments, can also It is subject to suitable change in the range of it can be adapted to the purport of the present invention to implement, these are all contained in protection scope of the present invention In.It should be noted that the evaluation method of the physical property in following embodiment 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 following method.Use molecularly oriented meter (Oji Scientific Instruments Co., Ltd.s system, MOA-6004 types molecularly oriented meter), obtain the slow-axis direction of film, with slow-axis direction with The parallel mode of test sample long side is cut to 4cm × 2cm rectangle, as test sample.To the sample, pass through Ah Shellfish index meter (ATAGO company systems, NAR-4T, measure wavelength 589nm) obtain orthogonal twin shaft refractive index (slow-axis direction Refractive index：Ny, the refractive index in the direction orthogonal with slow-axis direction：Nx) and thickness direction refractive index (Nz), by foregoing twin shaft Anisotropy (△ Nxy) of the absolute value (| Nx-Ny |) of refringence 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 The product (△ Nxy × d) for penetrating the anisotropy (△ Nxy) of rate and the thickness d (nm) of film obtains retardation (Re).

(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 to 20msec.

(3) rainbow spot is observed

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

○：Not it was observed that rainbow spot

△：Somewhat it was observed that rainbow spot

×：Rainbow spot is not observed

(Production Example 1- polyester A)

Esterification reaction tank is heated up, at the time of reaching 200 DEG C, puts into the mass parts of terephthalic acid (TPA) 86.4 and second two The mass parts of alcohol 64.6, while stirring antimony trioxide 0.017 mass parts of the input as catalyst, magnesium acetate 4 hydrate 0.064 Mass parts, the mass parts of triethylamine 0.16.Then, pressurization heating is carried out, is pressurizeed under conditions of gauge pressure 0.34MPa, 240 DEG C After esterification, esterification reaction tank is returned to normal pressure, add the mass parts of phosphoric acid 0.014.And then it was warming up to 260 with 15 minutes DEG C, add the mass parts of trimethyl phosphate 0.012.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 terminates, filtration treatment is carried out 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, solidified, 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.(PET (A) is abbreviated as later.)

(Production Example 2- polyester B)

By dry ultra-violet absorber (2,2 '-(1,4- phenylenes) double (4H-3,1- benzoxazine -4- ketone) 10 mass Part, the mass parts of PET (A) (inherent viscosity 0.62dl/g) 90 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, prepared as dicarboxylic acid component (relative to dicarboxyl Sour composition is overall) 46 moles of % of terephthalic acid (TPA), 46 moles of % and 5- sulfoisophthalic acids sodium of M-phthalic acid, 8 moles of %, Water as (overall relative to diol component) ethylene glycol 50 moles of % and 50 moles of % of neopentyl glycol of diol component composition The dispersed copolymer polyester resin of alkali containing Sulfonic acid metal.Then, by the mass parts of water 51.4, the mass parts of isopropyl alcohol 38, normal-butyl After the mass parts of cellosolve 5, the mixing of the mass parts of nonionic surfactants 0.06, heating stirring is carried out, after reaching 77 DEG C, is added The above-mentioned mass parts of water dispersible alkali containing Sulfonic acid metal copolymer polyester resin 5, continue stirring to resin block disappear after, by resin Aqueous dispersions are cooled to normal temperature, obtain the mass % of solid component concentration 5.0 uniform water dispersible copolymer polyester resin liquid.Enter And disperse aggregation silica dioxide granule (FUJI SILYSIA CHEMICAL LTD. systems, SILYSIA 310) 3 mass parts After the mass parts of water 50, SILYSIA 310 moisture is added into the above-mentioned mass parts of water dispersible copolymer polyester resin liquid 99.46 The mass parts of dispersion liquid 0.54, the mass parts of water 20 are added while stirring, obtain cementability and be modified coating fluid.

(polaroid protective film 1)

As PET (A) resin particle 90 mass parts of the base film intermediate layer raw material without particle and purple will be contained The mass parts of PET (B) resin particle 10 of ultraviolet absorbers are carried out 6 hours at 135 DEG C after being dried under reduced pressure (1Torr), to extrusion Machine 2 (intermediate layer II layers use) supply, in addition, by conventional method by PET (A) dry and respectively to extruder 1 (outer layer I layers and Outer layer III use) supply, dissolved at 285 DEG C.By 2 kinds of polymer respectively with filter material (the nominal filter essence of stainless steel sintered body 10 μm of particles 95% of degree end) 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.Now, with I layers, II layers, III layers thickness ratio turn into 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, at 80 DEG C dry 20 seconds.

The non-stretched film formed with coating layer is imported into tentering stretching-machine, while clamping the end of film with fixture Portion, while importeding into the hot blast region of 125 DEG C of temperature, 4.0 times are stretched in the width direction.Then, keep stretching in width Amplitude, handled 10 seconds at 225 DEG C of temperature, and then 3.0% relaxation processes are carried out in width, obtain film thickness About 100 μm of uniaxial tension 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, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial tension 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, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial tension 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, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial tension 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, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial tension 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, operated in the same manner as polaroid protective film 1, It is filmed, obtains the uniaxial tension 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)

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

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

(embodiment 2)

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

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

(comparative example 1)

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

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

(comparative example 2)

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

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

(comparative example 3)

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

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

(embodiment 3)

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

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

(embodiment 4)

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

(embodiment 5)

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

(embodiment 6)

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

(embodiment 7)

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

(comparative example 4)

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

(embodiment 8)

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

(embodiment 9)

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

(comparative example 5)

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

(comparative example 6)

By Sony Corporation BRAVIA KDL-55W900A visible side and the Polarizer of light source side with poly- Ester film turns into is replaced into above-mentioned Polarizer 3 with the toss about mode of (distal end) of liquid crystalline phase, and liquid crystal display device is made.

(comparative example 7)

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

(comparative example 8)

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

(embodiment 10)

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

(embodiment 11)

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

(embodiment 12)

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

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

[table 1]

Industrial applicability

The liquid crystal display device of the present invention has wide colour gamut, and is able to ensure that in any viewing angle iris color spot The good visuality being suppressed significantly is produced, industrial applicability is high.

Claims

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

At least one Polarizer in 2 Polarizers is to be laminated with the polarisation of oriented film at least one 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 has the summit of luminescent spectrum respectively,

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

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

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

3. 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 to Bx, half breadth is set into By,

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

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

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

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

5. liquid crystal display device according to claim 3, wherein, the Rx is more than 630nm.

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

7. liquid crystal display device according to claim 3, wherein, the Ry is below 180nm.

8. liquid crystal display device according to claim 4, wherein, the Ry is below 180nm.

9. liquid crystal display device according to claim 5, wherein, the Ry is below 180nm.