Polarizing plate and display device

A polarizing plate and circular polarization technology, which is applied in the field of polarizing plates and display devices, can solve the problems of circular polarizing plates turning blue and red, and achieve the effect of small in-plane changes

Inactive Publication Date: 2020-12-18
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the circular polarizing plate with the retardation film is placed in a high-temperature environment, there is a problem that the color tone of the circular polarizing plate turns blue or red from the initial state

Method used

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  • Polarizing plate and display device
  • Polarizing plate and display device
  • Polarizing plate and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0159] 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.

[0160] (1) Measuring method of film thickness

[0161] Measurement was performed using MH-15M, a digital micrometer manufactured by Nikon Corporation.

[0162] (2) Measurement method of phase difference

[0163] The measurement was performed using a phase difference measuring device KOBRA-WPR (manufactured by Oji Scientific Instruments, Ltd.).

[0164] (3) Measuring method of reflection hue

[0165] The reflection color tone (a*, b*) was measured using a spectrophotometer (Konica Minolta Japan Co., Ltd. brand name: CM-2600d). The reflection color tone is a value when the light source is D65, a...

manufacture example 1

[0170] [Manufacturing example 1] Production of polarizing film

[0171] A polyvinyl alcohol film with a thickness of 20 μm (average degree of polymerization about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched to about 4 times by dry stretching, and then kept under tension in pure water at 40°C. After 40 seconds of immersion in water, the weight ratio of iodine / potassium iodide / water was immersed in an aqueous solution of 0.052 / 5.7 / 100 at 28° C. for 30 seconds to perform a 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, it was dried at 60°C for 50 seconds and then at 75°C for 20 seconds while maintaining a tension of 300 N. Absorptive polarizer with a thickness of 8 μm. The contraction force of the obtained polarizing plate was 1.5 N / 2mm.

manufacture example 2

[0172] [Manufacturing example 2] Production of retardation film

[0173] 5 parts (weight average molecular weight: 30000) of a photo-alignment material having the following structure and 95 parts of cyclopentanone (solvent) were mixed as components, and the resulting mixture was stirred at 80° C. for 1 hour to obtain a composition for forming an alignment film thing.

[0174]

[0175] 1.0 parts of a leveling agent (F-556; manufactured by DIC Corporation) was added to a mixture obtained by mixing 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 Six parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)-1-butanone (“Irgacure 369 (Irg369)”, manufactured by BASF Japan Co., Ltd.) as an initiator.

[0176] Next, N-methyl-2-pyrrolidone (NMP) was added so that the solid content concentration might be 13%, and it stirred at 80 degreeC for 1 hour, and obtained the composition f...

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Abstract

The purpose of the present invention is to provide a circularly polarizing plate provided with a phase difference film, the circularly polarizing plate having minimal change in reflective hue even when placed in a high-temperature environment. A circularly polarizing plate having a polarizing plate and a phase difference film, the circularly polarizing plate being characterized in that the phase difference film includes a phase difference layer having positive birefringence, the polarizing plate includes a polarizer having a thickness of 15 [mu]m or less and has a protective film on both surfaces of the polarizer, and the protective film between the polarizer and the phase difference film is a non-oriented film having negative birefringence.

Description

technical field [0001] The invention relates to a polarizing plate and a display device. Background technique [0002] In recent years, image display devices typified by organic electroluminescent (hereinafter, also referred to as organic EL) display devices are rapidly spreading. In an organic EL display device, a circularly polarizing plate including a polarizing plate and a retardation film (λ / 4 plate) is mounted. By arranging a circular polarizing plate, the reflection of external light can be prevented and the visibility of the screen can be improved. [0003] With the rise of organic EL display devices, there has been a strong demand for thinner image display devices, and accordingly, thinner circularly polarizing plates have also been required. A change from a conventional retardation film obtained by molding a resin film to a retardation film formed of a thinner liquid crystal compound is under study (for example, refer to Patent Document 1). When the circularly p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G09F9/30H01L27/32H01L51/50H05B33/02H05B33/14
CPCG02B5/30H05B33/14H05B33/02G09F9/30H10K59/00H10K50/00G02B5/3083G02B5/3033G02B1/14G02B1/04G02B5/3016H10K59/50
Inventor 中村大地松本寿和
Owner SUMITOMO CHEM CO LTD
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