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Polarizing plate with retardation layer and image display device using the same

A technology for image display devices and retardation layers, which is applied in identification devices, lighting devices, optics, etc., can solve the problems of reduction, reduction of optical characteristics, and insufficient optical characteristics of polarizing plates, etc., and achieve excellent handling and excellent optical characteristics. Effect

Active Publication Date: 2022-07-12
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 with retardation layer and image display device using the same
  • Polarizing plate with retardation layer and image display device using the same
  • Polarizing plate with retardation layer and image display device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] 1. Production of polarizing film

[0193] As the thermoplastic resin substrate, an amorphous isophthalic acid copolymer polyethylene 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 base material.

[0194]100 weight of PVA-based resin obtained by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z410") at a ratio of 9:1 After adding 13 parts by weight of potassium iodide to the part, it was dissolved in water to prepare an aqueous PVA solution (coating liquid).

[0195] The above-mentioned PVA aqueous solution was apply|coated to the corona-treated surface of a resin base material, and it dried at 60 degreeC, and formed the PVA-type resin layer of thickness 8 micrometers, and produced the laminat...

Embodiment 2-1

[0214] 1. Production of polarizing film

[0215] The coating thickness of the PVA aqueous solution (coating solution) was changed to 13 μm, the thickness of the obtained polarizing film was 4.6 μm, and the concentration of the dyeing bath was adjusted so that the monomer transmittance (Ts) of the polarizing film was 43.0%, Except for this, it carried out similarly to Example 1, and formed the polarizing film on the resin base material.

[0216] 2. Production of polarizing plate

[0217] 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-piece transmittance of the polarizing plate (substantially a polarizing film) was 43.0%, and the degree of polarization was 99.995%. Furthermore, A 550 / A 210 is 1.65, A 470 / A 600 is 0.87, and the quadrature b value is -3.0.

[0218] 3. Production of retardation film ...

Embodiment 2-2

[0223] 1. Production of polarizing film

[0224] A polarizing film was formed on a resin substrate in the same manner as in Example 2-1, except that the concentration of the dyeing bath was adjusted so that the monomer transmittance (Ts) of the polarizing film was 44.0%.

[0225] 2. Production of polarizing plate

[0226] 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 44.0%, and the degree of polarization was 99.96%. Furthermore, A 550 / A 210 is 1.48, A 470 / A 600 is 0.87, and the quadrature b value is -5.0.

[0227] 3. Production of polarizing plate with retardation layer

[0228] In the same manner as in Example 1, the surface of the polarizing film of the polarizing plate obtained in the above 2. was pasted with the reta...

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Abstract

The present invention provides a polarizing plate with a retardation layer that is thin, has excellent handling properties, and is excellent in optical properties. The polarizing plate with retardation layer of the present invention has a polarizing plate and a retardation layer, and the polarizing plate includes a polarizing film and a protective layer on at least one side of the polarizing film. The polarizing film is composed of a polyvinyl alcohol-based resin film containing a dichroic substance, its thickness is 8 μm or less, and the cross absorbance A at a wavelength of 550 nm 550 and orthogonal absorbance A at wavelength 210nm 210 ratio (A 550 / A 210 ) is 1.4 to 3.5. Re(550) of the retardation layer is 100 nm to 190 nm, and Re(450) / Re(550) is 0.8 or more and less than 1. The angle formed by the slow axis of the retardation layer and the absorption axis of the polarizing film is 40° to 50°.

Description

technical field [0001] The present invention relates to a polarizing plate with a retardation layer and an image display device using the same. Background technique [0002] In recent years, image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices (eg, organic EL display devices and inorganic EL display devices) are rapidly spreading. In image display devices, polarizing plates and retardation plates are typically used. In practical applications, a polarizing plate with a retardation layer in which a polarizing plate and a retardation plate are integrated is widely used (for example, Patent Document 1). The demand for thinning of the polarizing plate of the poor layer 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, and in this case, further thinning is required for polarizing plates and polarizing plates with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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