Unlock instant, AI-driven research and patent intelligence for your innovation.

Polarizing plate with phase difference layer and image display device using same

A retardation layer and polarizing plate technology, applied in lighting devices, optics, light sources, etc., can solve the problems of reduced optical characteristics, reduced optical characteristics, insufficient optical characteristics of polarizing plates, etc., and achieves the effects of excellent optical characteristics and excellent handleability.

Active Publication Date: 2021-05-25
NITTO DENKO CORP
View PDF23 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the polarizing film is only reduced, the optical characteristics will be reduced
More specifically, one or both of the degree of polarization and the transmittance of a single element in a trade-off relationship will be reduced to an unacceptable level in practical applications
As a result, the optical characteristics of the polarizing plate with a retardation layer will also become insufficient.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarizing plate with phase difference layer and image display device using same
  • Polarizing plate with phase difference layer and image display device using same
  • Polarizing plate with phase difference layer and image display device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] 1. Fabrication of Polarizing Film

[0193] As the thermoplastic resin substrate, a long amorphous isophthalic acid-copolymerized polyethylene terephthalate film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of about 75° C. was used. Corona treatment is performed on one side of the resin substrate.

[0194] 100 wt. 13 parts by weight of potassium iodide was added to each part, and it was dissolved in water to prepare an aqueous PVA solution (coating solution).

[0195] The above-mentioned PVA aqueous solution was applied on the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm to produce a laminate.

[0196] The free end of the obtained laminate was uniaxially stretched 2.4 times in the longitudinal direction (longitudinal direction) between rolls having different circumferential speeds in an oven at 130° C. (in-air auxiliary stretching treatment).

[0197] Next, the lamin...

Embodiment 2-1

[0214] 1. Fabrication of Polarizing Film

[0215] In the same manner as in Example 1, a polarizing film with a thickness of 5 μm was formed on the resin substrate.

[0216] 2. Fabrication of polarizing plate

[0217] Use the triacetate cellulose (TAC) film (hard coat thickness 7 μ m, TAC thickness 25 μ m, modulus of elasticity: 3600MPa) with hard coat as protective layer, except that, operate in the same way as in Example 1, make protective Layer / adhesive layer / polarizing film composition of the polarizing plate.

[0218] 3. Fabrication of the retardation film constituting the retardation layer

[0219] Except that the PMMA of 0.7 mass parts is melt-kneaded, the polyester carbonate resin (pellets) obtained in the same manner as in Example 1 was vacuum-dried at 80° C. for 5 hours, and then, using a single-screw extruder ( Manufactured by Toshiba Machine Co., Ltd., barrel set temperature: 250°C), T-die (width 200mm, set temperature: 250°C), cooling roll (set temperature: 120-...

Embodiment 2-2

[0223] The elongated polyester carbonate resin film with a thickness of 105 μm obtained in the same manner as in Example 2-1 was stretched in the width direction while being adjusted so that a predetermined retardation could be obtained to obtain a retardation film with a thickness of 38 μm. . Re(550) of the obtained retardation film was 140 nm.

[0224] Except using above-mentioned retardation film as retardation layer, operate similarly with embodiment 2-1, obtain the film with retardation layer having the composition of protective layer / bonding layer / polarizing film / adhesive layer / retardation layer polarizer. The total thickness of the obtained polarizing plate with a retardation layer was 81 μm. The obtained polarizing plate with a retardation layer was subjected to the same evaluation as in Example 1. The results are shown in Table 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
elastic modulusaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The present invention provides a thin polarizing plate with a phase difference layer, the polarizing plate having excellent handling properties and excellent optical characteristics. The polarizing plate with a phase difference layer according to the present invention comprises: a polarizing plate which comprises a polarizing film and a protective layer that is arranged on at least one side of the polarizing film; and a phase difference layer. The polarizing film is configured of a polyvinyl alcohol resin film that contains a dichroic substance; and the polarizing film has a thickness of 8 [mu]m or less, a single transmittance of 48% or more, and a degree of polarization of 85% or more. The phase difference layer has an Re(550) of from 100 nm to 190 nm, with the value of Re(450) / Re(550) being 0.8 or more but less than 1. The angle between the slow axis of the phase difference layer and the absorption axis of the polarizing film is from 40 to 50 degrees.

Description

technical field [0001] The present invention relates to a polarizing plate with a retardation layer and an image display device using the polarizing plate. Background technique [0002] In recent years, image display devices typified by liquid crystal display devices and electroluminescent (EL) display devices (for example, organic EL display devices and inorganic EL display devices) are rapidly spreading. In an image display device, a polarizing plate and a phase difference plate are typically used. In practical applications, a polarizing plate with a retardation layer integrated with a polarizing plate and a retardation plate is widely used (for example, Patent Document 1). The demand for thinner polarizers with poor layers is also increasing. In addition, in recent years, the demand for curved image display devices and / or flexible or bendable image display devices has increased. In this case, further thinning of polarizers and polarizers with retardation layers is requi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/023B32B27/30B32B27/36G02F1/1335G02F1/13363H01L27/32H01L51/50H05B33/02H05B33/14
CPCG02B5/3083G02B5/3033G02B1/04G02B1/14H10K59/50
Inventor 后藤周作柳沼宽教友久宽清水享
Owner NITTO DENKO CORP