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Liquid crystal display device and polarizing plate

A technology of liquid crystal display devices and polarizers, applied in optics, polarizing elements, nonlinear optics, etc., can solve the problems of expensive TAC film, inability to obtain mechanical strength, deterioration of moisture permeability, etc., and achieve good visibility

Active Publication Date: 2021-07-20
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the TAC film used as a protective film is reduced for this reason, sufficient mechanical strength cannot be obtained, and the problem of deterioration of moisture permeability will occur.
In addition, TAC film is very expensive, and polyester film has been proposed as an inexpensive alternative material (Patent Documents 1 to 3), but there is a problem that iridescent spots are observed

Method used

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  • Liquid crystal display device and polarizing plate
  • Liquid crystal display device and polarizing plate
  • Liquid crystal display device and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0105] Hereinafter, the present invention will be described in more detail with reference to the examples, but the present invention is not limited by the following examples, and can also be implemented with appropriate changes within the scope of the gist of the present invention, which are all included in the protection of the present invention. in range. In addition, the evaluation method of the physical property in the following Example is as follows.

[0106] (1) Refractive index of polyester film

[0107] Using a molecular orientation meter (manufactured by Oji Scientific Instruments Co., Ltd., MOA-6004 molecular orientation meter), the slow axis direction of the film was obtained, and a 4 cm × 2 cm film was cut out so that the slow axis direction was parallel to the long side. Rectangular, as a sample for measurement. For this sample, the refractive index (refractive index in the slow axis direction: Ny, fast axis ( The refractive index in the direction perpendicular...

manufacture example 1

[0122] (Manufacturing example 1-polyester A)

[0123] The esterification reaction tank was heated up, and when it reached 200°C, 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol were added, and 0.017 parts by mass of antimony trioxide and magnesium acetate tetrahydrate were added as catalysts while stirring. 0.064 parts by mass, 0.16 parts by mass of triethylamine. Next, after pressurizing and raising temperature, and carrying out pressurized esterification reaction on gauge pressure 0.34MPa, 240 degreeC conditions, the esterification reaction tank was returned to normal pressure, and phosphoric acid 0.014 mass part was added. Furthermore, it heated up to 260 degreeC over 15 minutes, and added 0.012 mass parts of trimethyl phosphates. Then, 15 minutes later, dispersion treatment was performed with a high-pressure disperser, and 15 minutes later, the obtained esterification reaction product was transferred to a polycondensation reaction tank, a...

manufacture example 2

[0125] (Manufacturing example 2-polyester B)

[0126] 10 parts by mass of dry ultraviolet absorber (2,2'-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one), PET (A) not containing particles (Intrinsic viscosity is 0.62dl / g) 90 parts by mass were mixed, and a polyethylene terephthalate resin (B) containing an ultraviolet absorber was obtained using a kneading extruder. (hereinafter abbreviated as PET (B))

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PUM

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Abstract

Provided: In a liquid crystal display device having a backlight light source with a narrow half-value width of each peak of the emission spectrum, such as a backlight light source including a light source emitting excitation light and a quantum dot, even when a polyester film is used as a polarizer In the case of a protective film, a liquid crystal display device in which rainbow spots can also be suppressed. A liquid crystal display device, which has: a backlight source, two polarizers, and a liquid crystal unit disposed between the two polarizers, the backlight source includes a light source and quantum dots that emit excitation light, and at least one of the polarizers is The polarizing plate is obtained by laminating a polyester film on at least one surface of a polarizing plate, and the refractive index of the polyester film in a direction parallel to the transmission axis of the polarizing plate is 1.53 to 1.62.

Description

technical field [0001] The present invention relates to a liquid crystal display device and a polarizing plate. Specifically, it relates to a liquid crystal display device and a polarizing plate capable of reducing iridescent unevenness. Background technique [0002] The polarizing plate used in the liquid crystal display (LCD) usually has a structure in which two polarizer protective films are sandwiched between the polarizing plate obtained by dyeing polyvinyl alcohol (PVA) or the like with iodine. Sheet protection film, usually using triacetate cellulose (TAC) film. In recent years, along with the thinning of LCDs, the thinning of polarizing plates has been demanded. However, if the thickness of the TAC film used as a protective film is thinned for this reason, sufficient mechanical strength cannot be obtained, and the problem that moisture permeability deteriorates arises. In addition, TAC films are very expensive, and polyester films have been proposed as inexpensive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335G02B5/30G02F1/13357
CPCG02F1/1335G02B5/30G02F1/133528G02F1/1336G02F1/133507G02F2202/28
Inventor 村田浩一佐佐木靖早川章太向山幸伸
Owner TOYOBO CO LTD