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Polarizing plate equipped with phase difference layer and image display apparatus employing same

A retardation layer and polarizing plate technology, which is applied in identification devices, lighting devices, optics, etc., can solve the problems of reduced optical properties, low optical properties, insufficient optical properties of polarizing plates, etc., and achieve excellent optical properties and excellent handling.

Pending Publication Date: 2021-05-25
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the polarizing film is only reduced, the optical characteristics will be reduced
More specifically, one or both of the degree of polarization and the transmittance of a single element in a trade-off relationship will be reduced to an unacceptable level in practical applications
As a result, the optical characteristics of the polarizing plate with a retardation layer will also become insufficient.

Method used

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  • Polarizing plate equipped with phase difference layer and image display apparatus employing same
  • Polarizing plate equipped with phase difference layer and image display apparatus employing same
  • Polarizing plate equipped with phase difference layer and image display apparatus employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0194] 1. Fabrication of Polarizing Film

[0195] As the thermoplastic resin substrate, a long amorphous isophthalic acid-copolyethylene terephthalate film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of about 75° C. was used. Corona treatment is performed on one side of the resin substrate.

[0196] 100 wt. After adding 13 parts by weight of potassium iodide to each part, it was dissolved in water to prepare an aqueous PVA solution (coating solution).

[0197] The above-mentioned PVA aqueous solution was applied on the corona-treated surface of the resin base material and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm to produce a laminate.

[0198] The free end of the obtained laminate was uniaxially stretched 2.4 times in the longitudinal direction (longitudinal direction) between rolls having different circumferential speeds in an oven at 130° C. (assisted in-air stretching treatment).

[0199] Next, the laminated body ...

Embodiment 2

[0216] 1. Fabrication of Polarizing Film

[0217] A polarizing film having a thickness of 5.0 μm was formed on a resin substrate in the same manner as in Example 1 except that the single transmittance (Ts) of the polarizing film was 43.0%.

[0218] 2. Fabrication of polarizing plate

[0219] Except having used the polarizing film obtained in said 1., it carried out similarly to Example 1, and produced the polarizing plate which has the structure of a protective layer / adhesive layer / polarizing film. The single transmittance of the polarizing plate (substantially a polarizing film) was 43.0%, and the degree of polarization was 99.995%.

[0220] 3. Fabrication of the retardation film constituting the retardation layer

[0221] Except having set Re(550) of the retardation film to 144 nm, it carried out similarly to Example 1, and obtained the retardation film.

[0222] 4. Fabrication of polarizing plate with retardation layer

[0223] On the surface of the polarizing film of t...

Embodiment 3-1

[0225] 1. Fabrication of Polarizing Film

[0226] In the same manner as in Example 2, a polarizing film with a thickness of 5.0 μm was formed on the resin substrate.

[0227] 2. Fabrication of polarizing plate

[0228] Use the triacetate cellulose (TAC) film (hard coat thickness 7 μ m, TAC thickness 25 μ m, modulus of elasticity: 3600MPa) with hard coat as protective layer, except that, operate in the same way as in Example 1, make protective Layer / adhesive layer / polarizing film composition of the polarizing plate. The single transmittance of the polarizing plate (substantially a polarizing film) was 43.0%, and the degree of polarization was 99.995%.

[0229] 3. Fabrication of the retardation film constituting the retardation layer

[0230] Operate in the same manner as in Example 1 except that the PMMA of 0.7 parts by mass is melt-kneaded, and the obtained polyester carbonate resin (pellet) is vacuum-dried for 5 hours at 80° C., then, using a single-screw extruder ( Manuf...

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Abstract

Provided is a polarizing plate equipped with a phase difference layer, the polarizing plate being thin and having superior operability and optical properties. The polarizing plate equipped with a phase difference layer according to the present invention has: a polarizing plate containing a polarizing film and, at least on one side of the polarizing film, a protective layer; and a phase difference layer. The polarizing film is formed of a polyvinyl-alcohol-based resin film containing a dichroic substance, the thickness thereof is equal to or less than 8 [mu]m, the single transmittance thereof is equal to or greater than 43.0%, and the degree of polarization is equal to or greater than 99.980%. The Re(550) of the phase difference layer is 100-190 nm, and the Re(450) / Re(550) thereof is equal to or greater than 0.8 and less than 1. The angle formed by the slow axis of the phase difference layer and the absorption axis of the polarizing film is 40-50 degrees.

Description

technical field [0001] The present invention relates to a polarizing plate with a retardation layer and an image display device using the polarizing plate. Background technique [0002] In recent years, image display devices typified by liquid crystal display devices and electroluminescent (EL) display devices (for example, organic EL display devices and inorganic EL display devices) are rapidly spreading. In an image display device, a polarizing plate and a phase difference plate are typically used. In practical applications, a polarizing plate with a retardation layer that integrates a polarizing plate and a retardation plate is widely used (for example, Patent Document 1). In this case, with the recent demand for thinner image display devices The demand for thinner polarizers with retardation layers is also increasing. In addition, in recent years, the demand for curved image display devices and / or flexible or bendable image display devices has increased. In this case, ...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335G02F1/13363G09F9/30H01L27/32H01L51/50H05B33/02H05B33/14
CPCG02B5/3083G02B5/3033G02B1/04G02B1/14H10K59/50
Inventor 后藤周作柳沼宽教友久宽清水享
Owner NITTO DENKO CORP