Circularly polarizing plate and image display device using same

An image display device and circular polarization technology, which are applied in the field of image display devices and circular polarizing plates, can solve the problems of adverse effects on display characteristics, mixing of foreign objects, and lower manufacturing yields, and achieve excellent anti-reflection characteristics and suppress adverse effects.

Inactive Publication Date: 2021-04-09
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a circularly polarizing plate equipped with such a λ / 4 plate, foreign matter may be mixed in due to the manufacturing process, and the foreign matter (which is not a problem in the λ / 4 plate made of a resin film) becomes a bright spot, which may affect the display characteristics. cause adverse effects
In addition, there may be a problem that the manufacturing yield decreases

Method used

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  • Circularly polarizing plate and image display device using same
  • Circularly polarizing plate and image display device using same
  • Circularly polarizing plate and image display device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0357] Hereinafter, although an Example is given and this invention is demonstrated further concretely, this invention is not limited to these examples. In the examples, parts and % indicating content or usage-amount are based on weight unless otherwise indicated. In addition, the measurement of each physical property in the following example was performed by the following method.

[0358] (1) Determination of thickness:

[0359] The measurement was performed using a digital micrometer "MH-15M" manufactured by Nikon Corporation.

[0360] (2) Determination of in-plane retardation and thickness direction retardation:

[0361] The in-plane retardation at each wavelength and the thickness direction were measured at a temperature of 23°C using a phase difference meter "KOBRA (registered trademark)-WPR" manufactured by Oji Scientific Instruments Co., Ltd. based on the parallel Nicol rotation method. Delay.

[0362] (3) The actual number of foreign objects

[0363] The circularl...

manufacture example 1

[0366] [Manufacturing example 1] Production of polarizing film

[0367] 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 4 times by dry stretching, and then the pure After immersing in water for 40 seconds, it immersed in the aqueous solution whose weight ratio of iodine / potassium iodide / water was 0.052 / 5.7 / 100 at 28 degreeC for 30 seconds, and performed the dyeing process. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 11.0 / 6.2 / 100 at 70° C. for 120 seconds. Next, after washing with pure water at 8°C for 15 seconds, dry at 60°C for 50 seconds and then at 75°C for 20 seconds while maintaining a tension of 300 N to obtain a polyvinyl alcohol film in which iodine is adsorbed and carried out. Oriented polarizing film with a thickness of 12 μm.

manufacture example 2

[0368] [Manufacturing example 2] Production of retardation film A

[0369] A 2% by mass aqueous solution of polyvinyl alcohol (polyvinyl alcohol 1000 complete saponification type, manufactured by Wako Pure Chemical Industries, Ltd.) was used as a composition for forming an alignment film.

[0370] 1.0 parts of a leveling agent (F-556; manufactured by DIC Corporation) was added to a mixture of the polymerizable liquid crystal compound A and the polymerizable liquid crystal compound B shown below at a mass ratio of 90:10, and as a polymerization initiator 6 parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)-1-butanone ("Irgacure 369 (Irg369)", manufactured by BASF Japan Co., Ltd.) as a reagent.

[0371] Next, N-methyl-2-pyrrolidone (NMP) was added so that the solid content concentration might become 13%, and it stirred at 80 degreeC for 1 hour, and obtained the liquid crystal composition.

[0372] The polymerizable liquid crystal compound A was produced by the method desc...

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Abstract

A circularly polarizing plate provided with a polarizing film and a retardation film for functioning as a lambda / 4 plate, in this order, the angle formed by the absorption axis of the polarizing film with the slow axis of the retardation film being 35 degrees to 55 degrees, the retardation film including a liquid crystal material, the retardation film satisfying expressions (alpha) and (beta) ((alpha): Re(450) / Re(550)<=1.00; (beta):1.00<=Re(650) / Re(550)), the retardation film including an impurity, the thickness of the retardation film being 1.5 [mu]m or greater, and the surface of the retardation film being essentially flat.

Description

technical field [0001] The present invention relates to a circular polarizing plate and an image display device using the circular polarizing plate. Background technique [0002] In recent years, the popularization of mobile phones, tablet terminals, etc. has progressed, and liquid crystal display devices and organic electroluminescence display devices (organic EL display devices) have been widely used as image display devices. In an organic EL display device, a circular polarizing plate is generally arranged on the visible side surface of the organic EL panel in order to prevent external light from being reflected on a metal electrode (cathode) and viewed as a mirror. In addition, the market demands thinning of display devices. Therefore, in a display device that is required to be thinner, each member such as a polarizing plate and a circular polarizing plate used in the display device is also preferably a thin member. [0003] As the circular polarizing plate, a laminate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/023G02F1/1333G02F1/1335G02F1/13363G06F3/041G09F9/30H01L27/32H01L51/50H05B33/02
CPCH05B33/02B32B7/023G02B5/30G02F1/1333G02F1/1335G02F1/13363G06F3/041G09F9/30H10K59/00H10K50/00G02B5/3083G02B5/3016B32B2457/20H10K59/50
Inventor 松本寿和
Owner SUMITOMO CHEM CO LTD
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