Circular polarization light board and display device

A technology for circularly polarized light and display devices, which is applied in the directions of polarizing elements, optics, optical elements, etc., and can solve problems such as difficult circularly polarized light plates

Active Publication Date: 2014-03-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a broadband circularly polarizing plate, it is necessary to make the angle formed by the slow axis of the 1 / 2 wavelength plate and the absorption axis of the polarizing film and the angle formed by the slow axis of the 1 / 4 wavelength plate and the absorption axis of the polarizing film It is difficult to manufacture this circularly polarizing plate by roll-to-roll lamination because they are laminated at 15° or 75° staggered respectively.

Method used

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  • Circular polarization light board and display device
  • Circular polarization light board and display device
  • Circular polarization light board and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0334] [Preparation of composition for retardation layer formation]

[0335] The following components were mixed, and the obtained mixture was stirred at 80° C. for 1 hour to obtain a composition for retardation layer formation.

[0336] Compound A1 and Compound A2 were synthesized according to the method described in JP-A-2010-31223.

[0337] Compound A1 (80 parts):

[0338]

[0339] Compound A2 (20 parts):

[0340]

[0341] Polymerization initiator (6 parts):

[0342] 2-Dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one

[0343] (イルガキユア369; manufactured by Ciba Specialty Chemical Co., Ltd.)

[0344] Leveling agent (0.1 part): Polyacrylate compound (BYK-361N; manufactured by BYK-Chemie

[0345] Solvent: mixed solvent of o-xylene (300 parts) and cyclopentanone (130 parts)

[0346] [Preparation of composition for photo-alignment film formation]

[0347] The following components were mixed, and the resulting mixture was stirred at 80°C for 1 hour to obtain a c...

Embodiment 2

[0399] Same as embodiment 1, form the first alignment film (the polarization direction of the polarized UV is 45° with respect to the long-side direction of the base film) on one face of the transparent base film, form the retardation layer on this photo-alignment film . Then, after forming a protective layer on the phase difference layer, form a second alignment film (the polarization direction of polarized UV is 0° with respect to the long side direction of the substrate film), and further form a polarizing layer on this photo alignment film, Make this circular polarizing plate.

[0400] Similar to Example 1, the transparent base film of the produced circularly polarizing plate was bonded to the reflector using an adhesive, and the reflectance was measured. As a result, the reflectance of light in the range of 400 to 700 nm was about 1 to 10%. From this, it can be seen that sufficient antireflection characteristics can be obtained over the entire visible light region.

Embodiment 3

[0402] As polymerizable liquid crystal compound B1, compound (B-14) was used instead of compound (B-6), as polymerizable liquid crystal compound B2, compound (B-17) was used instead of compound (B-7), and other In the same manner as in Example 1, a circular polarizing plate was fabricated.

[0403]

[0404] Similar to Example 1, the transparent base film of the produced circularly polarizing plate was bonded to the reflector using an adhesive, and the reflectance was measured. As a result, the reflectance of light in the range of 400 to 700 nm was about 1 to 10%. From this, it can be seen that sufficient antireflection characteristics can be obtained over the entire visible light region.

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Abstract

The invention aims to provide a circular polarization light board that is thin and having a wide frequency band and a display device equipped with the circular polarization light board. The circular polarization light board is characterized by comprising a substrate, a phase difference layer and a polarized light layer. The birefringence Delta n (Lambda) of light with wavelength Lambda nm of the phase difference layer meets a formula (1) and a formula (2). The phase difference layer and the polarized light layer are both coating layers. The total thickness of the phase different layer and the polarized light layer are below 10 micrometers. Besides, the polarized light layer contains dichroism pigment. Delta n(450)/ Delta n(550)<=1.00(1); 1.00>= Delta n(650)/ Delta n(550)(2).

Description

technical field [0001] The invention relates to a circular polarizing plate and a display device. Background technique [0002] A known liquid crystal display device has a broadband circular polarizing plate formed by laminating a polarizing film formed of iodine-dyed polyvinyl alcohol, a 1 / 2 wavelength plate and a 1 / 4 wavelength plate. In such a broadband circularly polarizing plate, it is necessary to make the angle formed by the slow axis of the 1 / 2 wavelength plate and the absorption axis of the polarizing film and the angle formed by the slow axis of the 1 / 4 wavelength plate and the absorption axis of the polarizing film Since they are laminated with a shift of 15° or 75°, it is difficult to manufacture this circularly polarizing plate by roll-to-roll bonding. On the other hand, the demand for thinner display devices is also increasing, and therefore, thinner circularly polarizing plates are also required. [0003] Patent Document 1 describes a circularly polarizing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/1334G02F1/13363G02F1/1337
CPCG02B5/3083G02B5/3016G02F1/133528G02F1/13363B32B7/12G02F1/1337
Inventor 幡中伸行小林忠弘横田明
Owner SUMITOMO CHEM CO LTD
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