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Polarizing plate with phase difference layer and image display device

A technology of image display device and retardation layer, which is applied to polarizing elements, instruments, diodes, etc., and can solve the problems of large color shift and insufficient brightness.

Pending Publication Date: 2021-05-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies have problems in that the luminance in the oblique direction is not sufficiently small and the color shift in the oblique direction is large when displaying black.

Method used

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  • Polarizing plate with phase difference layer and image display device
  • Polarizing plate with phase difference layer and image display device
  • Polarizing plate with phase difference layer and image display device

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Experimental program
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Effect test

Embodiment 1

[0124] 1. Fabrication of polarizers

[0125] 1-1. Production of polarizer

[0126] As the thermoplastic resin substrate, a long amorphous isophthalic acid-copolymerized 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 was performed on one side of the resin substrate.

[0127] PVA prepared by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., product name "GOHSEFIMER Z410") at a ratio of 9:1 13 parts by mass of potassium iodide was added to 100 parts by mass of the resin, and the obtained product was dissolved in water to prepare an aqueous PVA solution (coating solution).

[0128] The above-mentioned PVA aqueous solution was applied to the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of ...

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Abstract

The invention provides a polarizing plate with a phase difference layer and an image display device. The invention provides the polarizing plate with the phase difference layer, which can realize the image display device with low brightness in the inclination direction and small color shift in the inclination direction during black display. The polarizing plate with the phase difference layer according to the present invention comprises a polarizing plate including a polarizer; a first phase difference layer which is disposed adjacent to the polarizing plate and has refractive index characteristics showing a relationship of nz > nx > ny; and a second phase difference layer which is disposed adjacent to the first phase difference layer, and has a refractive index characteristic showing a relationship of nx > ny = nz. The absorption axis of the polarizer is substantially orthogonal to the slow axis of the first phase difference layer, and the absorption axis of the polarizer is substantially parallel to the slow axis of the second phase difference layer.

Description

technical field [0001] The present invention relates to a polarizer with a retardation layer and an image display device. Background technique [0002] In an image display device (for example, a liquid crystal display device), various optical films that combine a polarizer and a retardation film are generally used for optical compensation. A circular polarizing plate as one of the above optical films can generally be produced by combining a polarizer with a λ / 4 plate. However, the λ / 4 plate generally exhibits the so-called "forward dispersion wavelength characteristic": a characteristic that the retardation value becomes larger as the wavelength becomes shorter; and its dispersion wavelength characteristic is generally large. Therefore, there is a problem that desired optical characteristics (for example, function as a λ / 4 plate) cannot be exhibited in a wide wavelength range. In order to avoid such a problem, in recent years, a retardation film exhibiting a so-called "rev...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02F1/13363G02B5/30
CPCG02F1/133528G02F1/13363G02B5/3041G02B5/3083G02B5/3033H10K59/50
Inventor 有贺草平林大辅
Owner NITTO DENKO CORP
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