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Circularly polarizing plate and organic el display device using same

A technology of circular polarizers and polarizers, applied in identification devices, lighting devices, optics, etc., can solve problems such as the inability to obtain black display, and achieve the effect of preventing color changes

Pending Publication Date: 2021-08-24
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In organic EL panels, there is a problem that a clear black display cannot be obtained because external light is reflected by the internal metal electrodes.

Method used

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  • Circularly polarizing plate and organic el display device using same
  • Circularly polarizing plate and organic el display device using same
  • Circularly polarizing plate and organic el display device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0290]

[0291] [Polarizing plate: Manufacture of polarizing plate including polarizing film formed from stretched film]

[0292] Using dry stretching, a polyvinyl alcohol film with a thickness of 30 μm (the average degree of polymerization is about 2400, and the degree of saponification is 99.9 mol%) is uniaxially stretched to about 5 times, and then it is stretched at 40 Immerse in pure water at °C for 40 seconds. Then, it was dipped at 28° C. for 30 seconds in an aqueous dyeing solution having a mass ratio of iodine / potassium iodide / water of 0.044 / 5.7 / 100 to perform a dyeing process.

[0293] Next, it was immersed in the boric-acid aqueous solution whose mass ratio of potassium iodide / boric acid / water was 11.0 / 6.2 / 100 at 70 degreeC for 120 second. Next, after washing with pure water at 8° C. for 15 seconds, drying was carried out at 60° C. for 50 seconds while maintaining a tension of 300 N, and then dried at 75° C. for 20 seconds to obtain a film with a thickness of 12 ...

Embodiment 2

[0323]

[0324] [Polarizing plate: Production of polarizing plate including a polarizing film formed from a composition containing a polymerizable liquid crystal compound]

[0325] (Manufacture of composition for alignment layer formation)

[0326] 2 parts of polymers described below and 98 parts of ortho-xylene were mixed, and the obtained mixture was stirred at 80° C. for 1 hour to obtain a composition for forming an alignment layer as a composition for forming a photo-alignment film.

[0327] · 2 parts of a polymer having a photoreactive group (number average molecular weight: 28,000) shown below

[0328] [chemical formula 21]

[0329]

[0330] (Manufacture of composition for polarizing layer formation)

[0331] The following components were mixed and stirred at 80° C. for 1 hour to obtain a composition for forming a polarizing layer.

[0332] 75 parts of polymerizable liquid crystal compounds represented by formula (1-6)

[0333] [chemical formula 22]

[0334]

...

Embodiment 3

[0357] As the substrate (transparent protective film) layer, instead of the cellulose triacetate film, a cycloolefin polymer film (COP; ZF-14; manufactured by Japan Zeon Co., Ltd.) was used, and a polarizing plate was produced in the same manner as in Example 2. and a circular polarizing plate were evaluated. The results are shown in Table 1.

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Abstract

The present invention provides a circularly polarizing plate comprising: a polarizing plate wherein a transparent protective film having a thickness of 10 mum to 80 mum, and a polarizing film containing a dichroic dye have been layered; and a phase contrasting film that is a cured product of a composition containing a polymerizable liquid crystal compound B. In the circularly polarizing plate, the phase contrasting film has a thickness of 5 mum or less, the polymerizable liquid crystal compound B is a compound having an ester bond within the molecular structure, and the polarizing plate has an equilibrium moisture content at 50% humidity and a temperature of 23 DEG C of 1.5 % by mass or less.

Description

technical field [0001] The present invention relates to a circular polarizing plate and an organic EL display device using the same. Background technique [0002] In recent years, with the popularization of thin displays, displays (organic EL display devices) equipped with organic EL panels have become popular. In organic EL panels, there is a problem that a clear black display cannot be obtained because external light is reflected by internal metal electrodes. To solve this problem, external light reflection can be suppressed by providing a circular polarizing plate on the viewing surface. That is, the stacking order from the viewer is circular polarizing plate → organic EL display. A circular polarizing plate can generally be produced by laminating a polarizing plate and a retardation film. As a polarizing plate, a product obtained by laminating a transparent protective film on a polarizing plate obtained by stretching PVA (polyvinyl alcohol) and dyeing it with iodine i...

Claims

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Application Information

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IPC IPC(8): G02B5/30G09F9/30H01L27/32H01L51/50H05B33/02
CPCC08F220/30C09K19/38C09K19/60G02B5/30G09F9/30H05B33/02H10K59/8791G02B5/3083G02B5/3016G02B1/04G02B1/14H10K59/50
Inventor 幡中伸行村野耕太
Owner SUMITOMO CHEM CO LTD
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