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Polarizer protective film, polarizing plate, and image display device

A technology for protective films and polarizers, applied in optical elements, polarizing elements, optics, etc., can solve the problems of uneven color, poor durability, and color difference, and achieve the effect of improving color unevenness and durability.

Pending Publication Date: 2021-06-29
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a polarizing plate provided with a colored layer may have poor durability in a humid environment
[0004] In addition, as described above, it is known to use a polarizing plate with a retardation layer to improve the viewing angle of an image display device, but in such an image display device, a difference in color tone may be visually observed on the display screen ( uneven color)

Method used

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  • Polarizer protective film, polarizing plate, and image display device
  • Polarizer protective film, polarizing plate, and image display device
  • Polarizer protective film, polarizing plate, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] 1. Fabrication of polarizer

[0113] A long roll of a polyvinyl alcohol (PVA)-based resin film (manufactured by Kuraray Co., Ltd., product name "PE3000") with a thickness of 30 μm is singled along the longitudinal direction by a roll stretching machine so as to be 5.9 times larger in the longitudinal direction. Swelling, dyeing, crosslinking, and washing treatments were performed simultaneously while axial stretching, and finally drying treatment was performed, thereby producing a polarizer with a thickness of 12 μm.

[0114] Specifically, in the swelling treatment, the film was stretched to 2.2 times while being treated with pure water at 20°C. Next, in the dyeing process, the obtained polarizer was stretched to 1.4° C. while being treated in a 30° C. aqueous solution whose weight ratio of iodine and potassium iodide was adjusted to be 1:7 so that the single transmittance of the obtained polarizer became 45.0%. times. Furthermore, a two-stage cross-linking treatment ...

Embodiment 2

[0123] As the pigment, 0.3 parts by weight of the product name "PD-320" manufactured by Yamamoto Chemical Co., Ltd. was used, and the stretching temperature was set at 139° C. (Tg+9° C.), and coloring was obtained in the same manner as in Example 1. Polarizer protective film. The obtained colored polarizer protective film had a thickness of 30 μm, a front retardation Re(550) of 135 nm, and a maximum absorption wavelength at 590 nm. In addition, the slow axis direction is 135° with respect to the longitudinal direction.

[0124] Except for using the above-mentioned colored polarizer protective film, it carried out similarly to Example 1, and obtained the elongated polarizing plate 2 which has the structure of protective film / polarizer / colored polarizer protective film.

[0125] An acrylic adhesive layer was provided on the surface of the polarizing plate 2 on the side of the colored polarizer protective film, and the acrylic adhesive layer was bonded to one side of an organic ...

Embodiment 3

[0127] A colored polarizer protective film was obtained in the same manner as in Example 1 except that the amount of the dye added was 0.18 parts by weight and the stretching temperature was 142° C. (Tg+12° C.). The obtained colored polarizer protective film had a thickness of 20 μm, a front retardation Re(550) of 100 nm, and a maximum absorption wavelength at 590 nm. In addition, the slow axis direction is 135° with respect to the longitudinal direction.

[0128] A strip-shaped polarizing plate 3 having a composition of protective film / polarizer / colored polarizer protective film was obtained in the same manner as in Example 1 except for using the above-mentioned colored polarizer protective film.

[0129] An acrylic adhesive layer was provided on the protective film (TAC film) side surface of the polarizing plate 3 , and laminated to one side of an organic EL panel of 55 inches or more through the acrylic adhesive layer to obtain a laminate 3 .

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Abstract

Provided are a polarizer protective film, a polarizing plate, and an image display device. Provided is a polarizing plate having improved durability in a humidified environment. The polarizer protective film is a resin film containing a dye, and has a water absorption rate of 3.0% or less. The polarizing plate has a polarizer and a polarizer protective film disposed on at least one side of the polarizer, the rate of change in visible light transmittance after 96 hours in an environment of 65 DEG C and 90% RH being 10% or less.

Description

technical field [0001] The present invention relates to a polarizer protective film, a polarizing plate and an image display device using the polarizer protective film. Background technique [0002] In a liquid crystal display device, which is one of typical image display devices, polarizing plates are attached to both sides of a liquid crystal cell because of an image forming method. A polarizing plate generally includes a polarizer and a protective film for protecting the polarizer, and may be used as a polarizing plate with a retardation layer further including a retardation layer from the viewpoint of increasing the viewing angle. In addition, the organic electroluminescent (EL) display device prevents problems such as external light reflection, background reflection, etc. caused by high reflectivity of the organic EL unit by disposing a circular polarizing plate on the visual observation side. As a general circular polarizing plate, it is known that a polarizer and a r...

Claims

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Application Information

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IPC IPC(8): G02B1/14G02B5/30G02F1/1335G02F1/13363H01L27/32
CPCG02B1/14G02B5/3083G02B5/3025G02B5/3041G02F1/133528G02F1/13363H10K59/50H10K59/10G02B5/3033C08J7/04
Inventor 中原步梦吉川贵博池田哲朗
Owner NITTO DENKO CORP
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