Liquid crystal display device, polarizing plate and polarizer protective film

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

Active Publication Date: 2014-07-30
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the thickness of the TAC film used as a protective film is thinned for this reason, sufficient mechanical strength cannot be obtained, and the moisture permeability increases, and the polarizer tends to deteriorate
Furthermore, TAC thin films are very expensive, and there is a strong need for inexpensive alternative materials

Method used

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  • Liquid crystal display device, polarizing plate and polarizer protective film

Examples

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Comparison scheme
Effect test

Embodiment

[0078] The present invention will be described in more detail below 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, and these implementation modes are also included in this document. within the scope of protection of the invention. In addition, the evaluation methods of the physical properties in the following examples are as follows.

[0079] (1) Film orientation principal axis

[0080] The orientation principal axis direction of the film was determined using a molecular orientation meter (Molecular Orientation Meter MOA-6004, manufactured by Oji Scientific Instruments, Ltd.).

[0081] (2) Retardation (Re)

[0082] Retardation refers to the parameter defined by the product (ΔNxy×d) of the anisotropy (ΔNxy=|Nx-Ny|) of the biaxial refractive index on the film and the film thickness d (nm), which is Displays the scale ...

manufacture example 1

[0097] (Manufacturing example 1-polyester A)

[0098] Elevate the temperature of the esterification reactor, and when it reaches 200°C, add 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol, and add 0.017 parts by mass of antimony trioxide and 0.064 parts by mass of magnesium acetate as catalysts while stirring. Hydrate, 0.16 parts by mass of triethylamine. Next, pressurization and temperature raising were performed, and after pressurized esterification reaction was performed on the conditions of gauge pressure 0.34MPa and 240 degreeC, the esterification reactor 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. Then, after 15 minutes, dispersion treatment was carried out with a high-pressure disperser, and after 15 minutes, the obtained esterification reaction product was transferred to a polycondensati...

manufacture example 2

[0100] (Manufacturing example 2-polyester B)

[0101] 10 parts by mass of dried UV absorber (2,2'-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one), 90 parts by mass of particle-free PET (A) (intrinsic viscosity: 0.62dl / g) is mixed, and a mixing extruder is used to obtain polyethylene terephthalate resin (B) (hereinafter abbreviated as PET (B) ).

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Abstract

A purpose of the present invention is to further suppress the occurrence of spectral irregularities in a liquid crystal display device that uses a light emitting diode as a light source, and uses an oriented polyester film having a given retardation as a polarizer protective film. The liquid crystal display device includes a backlight light source, two polarizing plates, and a liquid crystal cell disposed between the two polarizing plates. The backlight light source is a white light source having a continuous emission spectrum. The two polarizing plates are each formed from a polarizer and protective films on both sides of the polarizer. At least one of the protective films on either side is an oriented polyester film having a retardation of 3,000 to 30,000 nm. The polarizing axis of the polarizer and the main orientation axis of the oriented polyester film, which is a protective film of the polarizer, are substantially parallel.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Specifically, it relates to a liquid crystal display device in which occurrence of rainbow spots is improved. Background technique [0002] Polarizers used in liquid crystal displays (LCDs) generally consist of two polarizer protective films sandwiching polarizers dyed with iodine, such as polyvinyl alcohol (PVA), and triacetate is usually used as the polarizer protective film Cellulose (TAC) film. In recent years, along with the thinning of LCDs, the thinning of polarizing plates has been demanded. However, when the thickness of the TAC film used as a protective film is thinned for this reason, sufficient mechanical strength cannot be obtained, moisture permeability increases, and a polarizing plate tends to deteriorate. Furthermore, TAC thin films are very expensive, and inexpensive alternative materials are strongly desired. [0003] Therefore, for the purpose of thinning the pola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/30G02F1/13357G02F1/13363
CPCG02B5/3083G02F1/133528G02F1/133634
Inventor 村田浩一佐佐木靖
Owner TOYOBO CO LTD
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