Optical compensating polarizing plate, image display device and liquid crystal display device

A technology of optical compensation and optical compensation layer, applied in polarizing elements, optics, nonlinear optics, etc., can solve the problems of impossible to achieve the desired purpose, deterioration of polarizing plate performance, and phase difference changes.

Active Publication Date: 2007-05-02
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in these cases, it is hardly desirable that any moisture penetrates the polarizer, and thus remains therein, because it causes a problem of deterioration in the performance of the polarizing plate
In addition, similar to the above, the problem of phase difference variation is more severe in synthetic resin films than in TAC films, making it impossible to achieve the desired purpose

Method used

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  • Optical compensating polarizing plate, image display device and liquid crystal display device
  • Optical compensating polarizing plate, image display device and liquid crystal display device
  • Optical compensating polarizing plate, image display device and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0400] [Method for producing cellulose acylate film]

[0401] [Dissolution step]

[0402] Next, preparation of a cellulose acylate solution (dope) is explained. The cellulose acylate is dissolved by any method without limitation, ie, room temperature dissolution, cooling dissolution, heat dissolution or a combination thereof. Regarding the preparation of the cellulose acylate solution of the present invention, the concentration of the solution at the time of dissolution and filtration is preferably used as described in, for example, Japan Institute of Invention and Innovation Journal of Technical Disclosure No. 2001-1745 (2001.03.15, Japan Institute of Invention and Innovation), Methods on pages 22-25.

[0403] (transparency of dope)

[0404]It is preferable that the dope transparency of the cellulose acylate solution of the present invention is 85% or higher, more preferably 88% or higher, more preferably 90% or higher. In the present invention, it has been confirmed that...

Embodiment 1

[0486] (manufacturing transparent protective film)

[0487] In a stainless steel dissolving tank (4000L) with stirring blades, gradually add cellulose acetate powder (flakes) to the solvent mixture solution comprising the following ingredients, fully stir and disperse until the total amount reaches 2000kg. The optical anisotropy-reducing compound of the present invention and the wavelength dispersion regulator of the present invention (as listed in Table 1) were respectively added to obtain samples 101-106.

[0488] Cellulose triacetate (degree of substitution shown in Table 1) 17.0 parts by mass

[0489] Dichloromethane 70.5 parts by mass

[0490] Methanol 10.5 parts by mass

[0491] Provide optically isotropic compounds (as listed in Table 1) 2.0 parts by mass

[0492] Compounds for adjusting wavelength dispersion (as listed in Table 1) 0 or 8 parts by mass

[0493] The plane phase difference of the transparent protective film is |Re|≤10nm, and the thickness direction ph...

Embodiment 2

[0522] (manufacturing transparent protective film)

[0523] A solution of cellulose triacetate was prepared and sample 114 was made as in Example 1 but using the following composition.

[0524] Cellulose triacetate (powder, degree of substitution 2.86, viscosity-average degree of polymerization is 320, water content 0.4% by mass, viscosity in 6% by mass of dichloromethane solution is 305mPa·s, average particle size 1.5mm, and standard Deviation 0.5mm) 17.0 parts by mass

[0525] Dichloromethane 67.4 parts by mass

[0526] Methanol 12.7 parts by mass

[0527] Butanol 0.5 parts by mass

[0528] Triphenyl phosphate (TPP) 1.3 parts by mass

[0529] 0.7 parts by mass of biphenyl-diphenyl phosphate (BDP)

[0530] Provide optically isotropic compounds (as listed in Table 1) 2.0 parts by mass

[0531] Compounds (as listed in Table 1) for adjusting wavelength dispersion 0.8 parts by mass

[0532] (Structure of polarizing plate 7)

[0533] The above-mentioned transparent protect...

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Abstract

An optical compensation polarizing plate comprising: a first transparent protective film; a polarizer; a second transparent protective film; and an optical compensation layer in this order, wherein at least one of the first and second transparent protective films is a cellulose acylate film having a retardation value in plane Re (nm) and a retardation value in film thickness direction Rth (nm) which fulfill the following formulae (I) and (II), and Nz and Re1 defined by the following formulae (III) and (IV), of the optical compensation layer fulfill the following formulae (V) and (VI): (I) |Re|<=10, (II) |Rth|<=25, (III) NZ=(nx1-nz1) / (nx1-ny1), (IV) Re1=(nx1-ny1) x d1, (V) 0.4<=Nz<=0.6 (VI) 100<=Re1<=350, wherein RE1 is a retardation value in plane (nm) at a wavelength of 590 nm; Nz is an Nz factor at a wavelength of 590 nm; nx1 is a refractive index along a slow axis in a film plane; ny1 is a refractive index along a direction perpendicular to the slow axis in a film plane; nz1 is a refractive index along a thickness direction of the film; and d1 is a thickness of the film (nm).

Description

technical field [0001] The invention relates to an optical compensation polarizing plate, which comprises a polarizer on which a transparent protective film and an optical compensation layer are laminated. Furthermore, the present invention relates to an image display unit using the above-mentioned optically compensatory polarizing plate. The optically compensatory polarizing plate of the present invention is particularly suitable for use in liquid crystal display units operating in the so-called IPS mode. Background technique [0002] In liquid crystal display units mainly used at present, what is called a TN mode is used, in which liquid crystal molecules having positive dielectric anisotropy are aligned in a twisted state of about 90°. The TN mode liquid crystal display unit includes a substrate with a pair of transparent electrodes, a liquid crystal cell including a nematic liquid crystal encapsulated between the substrates, and polarizing plates arranged on both sides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13363
Inventor 西浦阳介中山元伊藤忠
Owner FUJIFILM CORP
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