Polarizing element in which film having high retardation and layer containing dichroic dye are laminated, and display device provided with the polarizing element

A technology of dichroic pigments and polarizing elements, applied in polarizing elements, optical elements, optical elements, etc., can solve the problem that the practical level of polarization performance of polarizing elements cannot fully meet the requirements, and achieve the effect of excellent polarization performance and easy manufacturing.

Active Publication Date: 2020-10-16
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the surface of the pigment film of the polarizing element is observed with an atomic force microscope (AFM), there are parts where the dichroic dye is uniformly oriented, and parts where the dichroic dye is hardly present and not oriented (pit)
Therefore, the polarizing performance of the obtained polarizing element cannot be sufficiently satisfactory at a practical level of a polarizing element for a display element.

Method used

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  • Polarizing element in which film having high retardation and layer containing dichroic dye are laminated, and display device provided with the polarizing element
  • Polarizing element in which film having high retardation and layer containing dichroic dye are laminated, and display device provided with the polarizing element
  • Polarizing element in which film having high retardation and layer containing dichroic dye are laminated, and display device provided with the polarizing element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] On the non-adhesion-treated surface of a stretched film (Cosmoshine SRF film manufactured by Toyobo Co., Ltd.) with a retardation of 10500 nm and a thickness of 100 μm, a glass rod provided with a distance of 3 μm from the stretched film was used. Coating machine, coated with 0.15 parts by mass of C.I. Direct Blue 67 4 parts by mass as a dichroic pigment, 0.15 parts by mass of polyoxyethylene polyoxypropylene alkyl ether (Emulgen MS-110 manufactured by Kao Corporation), and 100 parts by mass of water. solution. The obtained coating film was left to stand in an environment of 25 degreeC and 70% of humidity for 1 minute, and the solvent was dried. Furthermore, the dried coating film was subjected to heat treatment and humidification treatment for 5 minutes in an environment at 60° C. and a humidity of 90%, to obtain a dichroic dye-containing layer having a thickness of 0.15 μm. Using a spin coater, an acrylic resin-based ultraviolet curable resin composition (SPC-920C ma...

Embodiment 2

[0105] For the non-adhesively treated surface of the stretched film with a retardation of 10500 nm used in Example 1, a roller wound with a rubbing cloth (MK0012 manufactured by Taenaka Pile Fabrics Co., Ltd.) was used along the direction relative to the stretched film. A measurement sample was produced in the same manner as in Example 1, except that the direction of the slow axis was 0°, and a friction treatment was further performed at a speed of 100 rpm and a load of 5 kgf. At this time, the angle with respect to the slow axis of a stretched film was measured with KOBRA-21ADH (made by Oji Scientific Instruments).

Embodiment 3

[0107] With respect to the non-adhesively treated surface of the stretched film having a retardation of 10500 nm used in Example 1, rubbing was carried out in a direction at 45° to the slow axis of the stretched film with a roller wound with a rubbing cloth. The treatment was performed in the same manner as in Example 2 except for that, and a measurement sample was produced.

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Abstract

The purpose of the present invention is to provide a polarizing element that can be easily manufactured and has excellent polarization performance, and a display device that is provided with the polarizing element. A polarizing element of the present invention is characterized in that a stretched film having a retardation of 3000-50000 nm and a layer containing at least one type of dichroic dye are stacked therein and in that the thickness of the stretched film is 20-500 μm. This polarizing element employing this specific stretched film exhibits a high degree of polarization, specifically, a degree of polarization of 85% or higher, and exhibits high dichroism, specifically, dichroism of five or higher.

Description

technical field [0001] The present invention relates to a polarizing element in which a film having a high retardation and a layer containing a dichroic dye are laminated. In addition, the present invention relates to a display device provided with the polarizing element. Background technique [0002] Polarizing elements used in liquid crystal display devices, sunglasses, goggles, etc. are usually produced by adsorbing dichroic pigments such as iodine or dichroic dyes on polymer materials such as polyvinyl alcohol. On the film, the obtained film is then uniaxially stretched to align the dichroic dye molecules in a certain direction; or the polymer film is uniaxially stretched to adsorb the dichroic dye. However, the polarization axis and the absorption axis of the polarizing element obtained by these methods are perpendicular to each other, so the shape of the polarizing element is usually limited to a flat plate. In addition, in the manufacture of such a polarizing elemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C09B35/037G02F1/1335
CPCC09B35/037G02B5/30G02F1/1335B32B27/20B32B27/32B32B27/36B32B2307/4026B32B2551/00G02B5/3025G02B5/3083
Inventor 望月典明吉田昇平
Owner NIPPON KAYAKU CO LTD
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