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

Liquid crystal display device and polarizing plate

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

Active Publication Date: 2021-03-23
TOYOBO CO LTD
View PDF14 Cites 0 Cited by
  • 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

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
  • Liquid crystal display device and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0093] 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.

[0094] (1) Refractive index of polyester film

[0095] Using a molecular orientation meter (manufactured by Oji Scientific Instruments Co., Ltd., MOA-6004 molecular orientation meter), the slow axis direction of the film is obtained, and the slow axis direction is parallel to the long side of the sample for measurement, and cut out 4 cm. A rectangle of × 2 cm was used 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 th...

manufacture example 1

[0110] (Manufacturing example 1-polyester A)

[0111] 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

[0113] (Manufacturing example 2-polyester B)

[0114] 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))

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
particle sizeaaaaaaaaaa
temperatureaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

Provided: with peak tops in each wavelength region of the blue region (above 400nm and below 495nm), green region (above 495nm and below 600nm) and red region (above 600nm and below 780nm), red In a liquid crystal display device of a backlight light source having a narrow half-value width of the peak in the region (600nm to 780nm), iridescence is suppressed even when a polyester film is used as a polarizer protective film. A liquid crystal display device, which has: a backlight source, two polarizers and a liquid crystal unit arranged between the two polarizers, the backlight source is a white light-emitting diode with the following luminous spectrum: more than 400nm and lower than 495nm Each of the wavelength regions above 495nm and below 600nm and above 600nm and below 780nm has a peak top of the emission spectrum, and the half-value width of the peak with the highest peak intensity in the wavelength region above 600nm and below 780nm is less than 5nm, At least one of the polarizing plates is obtained by laminating a polyester film on at least one surface of the polarizing plate, and the refractive index of the polyester film in a direction parallel to the light 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) is generally composed of two polarizer protective films sandwiching 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 alternative materi...

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 Patents(China)
IPC IPC(8): G02F1/1335G02B5/30G02F1/13357
CPCG02F1/133528G02F1/133603G02B5/3033G02F1/1335G02B5/30Y02B20/00G02F1/133531
Inventor 早川章太村田浩一佐佐木靖向山幸伸
Owner TOYOBO CO LTD