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Anti-reflection circular polariser and image display device using same

A technology for image display devices and circular polarizing plates, which is applied to lighting devices, optics, light sources, etc., can solve the problems of reduced anti-reflection function, high transmittance, and unfavorable cost, and achieve less reduction in anti-reflection function and small deformation Effect

Pending Publication Date: 2021-11-05
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, TAC requires solution film formation, which is not only disadvantageous in terms of cost, but also has insufficient moisture resistance and heat resistance. In particular, the permeability of water is high. Permeation of alcohol (PVA) has the following problems: the reduction of the anti-reflection function caused by the reduction of the degree of polarization, or the shrinkage force of the uniaxially stretched PVA polarizer cannot be completely suppressed due to the hygroscopic softening of the TAC film, and the polarized Problems such as deformation of the image display panel caused by the shrinkage of the sheet

Method used

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  • Anti-reflection circular polariser and image display device using same
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  • Anti-reflection circular polariser and image display device using same

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Embodiment

[0312] Hereinafter, the present invention will be described more specifically with reference to examples. The present invention is not limited to the following examples, and can be appropriately modified and implemented within a range that can conform to the gist of the present invention. It should be noted that they are all included in the protection scope of the present invention.

[0313] The evaluation method of the physical property in an Example is as follows.

[0314] (1) Moisture transmission rate

[0315] Based on JIS Z 0208, it carried out under the conditions of 25 degreeC / 90%RH.

[0316] (2) Orientation axis direction and refractive index of base film

[0317] Using a molecular orientation meter (Molecular Orientation Meter MOA-6004, manufactured by Oji Scientific Instruments Co., Ltd.), the orientation axis direction of the base film was obtained, and a 4 cm × 2 cm rectangle was cut out so that the orientation axis direction became the long side, and obtained a...

manufacture example 1

[0354] (Manufacturing example 1-polyester X)

[0355] Raise the temperature of the esterification reactor, and when it reaches 200°C, put in 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol, and throw in 0.017 parts by mass of antimony trioxide and 0.064 parts by mass of magnesium acetate tetrahydrate as catalysts while stirring. parts by mass, 0.16 parts by mass of triethylamine. Next, pressurization and temperature rise were performed, and after pressurized esterification reaction was performed on the conditions of 0.34 MPa gauge pressure and 240 degreeC, the esterification reaction tank was returned to normal pressure, and 0.014 mass parts of phosphoric acid was added. Furthermore, it heated up to 260 degreeC over 15 minutes, and added 0.012 mass parts of trimethyl phosphates. Next, disperse in a high-pressure disperser for 15 minutes, transfer the obtained esterification reaction product to a polycondensation reactor after 15 minutes, and ...

manufacture example 2

[0357] (Manufacturing example 2-polyester Y)

[0358] 10 parts by mass of the dried ultraviolet absorber (2,2'-(1,4-phenylene) bis(4H-3,1-benzoxazin-4-one), PET (X ) (intrinsic viscosity is 0.62dl / g) 90 mass parts are mixed, with mixing extruder, obtain the polyethylene terephthalate resin (Y) that contains ultraviolet absorber. (hereinafter referred to as PET (Y))

[0359]

[0360] 90 parts by mass of PET (X) resin pellets containing no particles and 10 parts by mass of PET (Y) resin pellets containing ultraviolet absorbers as raw materials for the base film intermediate layer were dried under reduced pressure at 135° C. for 6 hours ( 1 Torr), it is supplied to the extruder 2 (for the middle layer II layer), and in addition, PET (X) is dried by a conventional method, and supplied to the extruder 1 (for the outer layer I layer and the outer layer III) respectively, and the Dissolution was performed at 285°C. The 2 types of polymers are respectively filtered with stainless...

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Abstract

Provided is an anti-reflection circular polariser suitable in particular for an organic EL image display device, said circular polariser making it possible to provide an excellent anti-reflection circular polariser for preventing reflection of outside light and, thus, to provide an excellent image display device in which a decrease in the anti-reflection function due to a decrease in the degree of polarisation under highly humid conditions is extremely low, and in which the change in shape of an image display panel is small. The anti-reflection circular polariser, in which a reflection-reducing layer, a light-transmitting base film, a polarising element and a [lambda] / 4 phase difference layer are layered in that order, is characterised in that the moisture permeation rate of said light-transmitting base film is 100 g / m2.day or less.

Description

technical field [0001] The invention relates to a polarizing plate for anti-reflection. More specifically, it relates to an antireflection polarizing plate suitable for use in an organic electroluminescence (organic EL) image display device. Background technique [0002] Conventionally, in an organic EL image display device, an antireflection polarizing plate (circular polarizing plate) is stacked on the visible side of the image display device in order to prevent degradation of display image quality and contrast reduction due to reflection of external light. In this antireflection polarizing plate, a polarizing plate protective substrate, a polarizing plate, and a λ / 4 retardation layer are laminated in this order from the viewer side. As a polarizing plate, a polyvinyl alcohol (PVA) film obtained by absorbing iodine or a dichroic dye and uniaxially stretching it is generally used. The following methods have been proposed for the λ / 4 retardation layer: a method of providin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30H05B33/02B32B7/023G02B1/111H01L27/32H01L51/50
CPCG02B1/111G02B5/3016G02B5/3083G02B5/3033H10K59/00H10K50/86H10K50/844G02B1/04C08L67/00B32B7/023H10K59/50G02B5/305
Inventor 铃木利武井上俊树柴野博史
Owner TOYOBO CO LTD
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