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Composite polarizing plate and TN mode liquid crystal panel

A composite polarization, liquid crystal panel technology, used in polarizing elements, synthetic resin layered products, instruments, etc., can solve the problems of reduced contrast, light leakage of the display screen, poor heat resistance, etc., and achieve the effect of suppressing dimensional changes

Active Publication Date: 2014-09-03
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned TN mode liquid crystal display device has disadvantages such as the following disadvantages: when the screen is viewed from an oblique direction, the contrast ratio is sharply lowered, or the gradation inversion of brightness and color tone occurs, and the oblique viewing angle characteristics are poor.
[0005] However, since the above-mentioned conventional optical compensation film is based on a triacetate cellulose film, the dimensional change is large in a high-temperature environment, and the heat resistance may be poor.
Therefore, in a liquid crystal display device using this optical compensation film, there is a problem that light leakage occurs at the edge of the liquid crystal display screen after being exposed to a high-temperature environment, and there is a problem that the brightness and contrast cannot sufficiently meet the high-level market demand. Quality situation

Method used

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  • Composite polarizing plate and TN mode liquid crystal panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] A cellulose triacetate film (KC8UX2MW, manufactured by Konica Minolta Co., Ltd., thickness: 80 μm) was placed on one side of a polarizer prepared by adsorbing and aligning iodine on polyvinyl alcohol, and a cyclic olefin film was placed on the opposite side. Retardation film made of resin-like resin (Zeonor film, manufactured by Japan Zeon Co., Ltd., R 0 : 80nm, R th : 110 nm, thickness: 40 μm) The absorption axis of the polarizing plate and the slow axis of the retardation film are made to be perpendicular to each other, and they are adhered with respective adhesives. At this time, after performing corona discharge treatment on the adhesive surface side of the phase difference film under the condition of a cumulative irradiation dose of 1680J, an epoxy-based ultraviolet curing Type adhesive for lamination with polarizers. Next, using an ultraviolet irradiation system (manufactured by Fusion UV Systems Co., Ltd.), ultraviolet rays were irradiated from the side of the ...

Embodiment 2

[0185] A composite polarizing plate was produced in the same manner as in Example 1, except that the triacetate cellulose film was replaced by a biaxially stretched polyethylene terephthalate film (thickness: 38 μm, haze: 2.3%). The amount of light leakage was evaluated using a TN-mode liquid crystal monitor composed of a TN-mode liquid crystal panel bonded with this composite polarizing plate, and it was 1.0 cd / m 2 .

Embodiment 3

[0201] (a) Fabrication of composite polarizing plate

[0202] On one side of a polarizer obtained by adsorbing and aligning iodine on polyvinyl alcohol, cellulose triacetate (KC8UX2MW, manufactured by Konica Minolta Co., Ltd.) with a thickness of 80 μm is placed as a transparent protective layer, and placed on the opposite side of the polarizer A retardation film with a thickness of about 40 μm made of cyclic olefin resin (obtained from Japan Zeon Co., Ltd.; R 0 =80nm, R th =110nm), to make a composite polarizing plate. At this time, corona discharge treatment is first performed on the adhesive surface side of the retardation film under the condition of a cumulative irradiation dose of 1680 J, and then the adhesive surface of the retardation film and the protective film made of triacetyl cellulose are bonded. The surface is coated with epoxy UV-curable adhesive respectively, and bonded with the polarizer. Next, ultraviolet rays were irradiated from the retardation film side...

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Abstract

Provided are a composite polarizing plate and a TN mode liquid crystal panel using the same, the composite polarizing plate being formed by laminating a transparent protection layer, a polarizer, a biaxial retardation film formed of an olefin resin, and an adhesive layer in sequence, wherein for the biaxial retardation film formed of an olefin resin, the in-plane retardation value R0 defined by the following formula (I) is 40 to 150 nm, the retardation value Rth in a thickness direction defined by the following formula (II) is 50 to 250 nm, and the Nz coefficient defined by the following formula (III) is more than 1 and equal to 7 or less, provided that the refractive index in the in-plane slow axis direction, the refractive index in the in-plane fast axis direction and the refractive index in the thickness direction measured by a light with a wavelength of 590nm are respectively set as nx, ny and nz, and the adhesive layer shows a storage elastic modulus of 0.15 to 10 Mpa in 23 to 80 DEG C. Thereby, it is possible to provide a composite polarizing plate capable of suppressing light leakage even when a liquid crystal display device has been exposed to a high temperature environment, and a TN mode liquid crystal panel using this polarizing plate. R0=(nx-ny)xd (I) Rth=[(nx+ny) / 2-nz]xd (II) Nz=(nx-nz) / (nx-ny) (III)

Description

technical field [0001] The invention relates to a composite polarizing plate, a TN (Twisted Nematic, twisted nematic) mode liquid crystal unit using the same, and a TN mode liquid crystal panel used in a liquid crystal display device. Background technique [0002] The TN mode liquid crystal cell is a liquid crystal cell in which a nematic liquid crystal is sealed between two transparent substrates, and the nematic liquid crystal is twisted by 90° between the two transparent substrates in the state of no voltage applied. In a state where a voltage is applied between the two transparent substrates, the nematic liquid crystal is aligned in the direction normal to the substrates. In a liquid crystal display device equipped with a TN-mode liquid crystal cell, a pair of polarizing plates are arranged on the outside of the two transparent substrates to control the transmission of light and Truncated, thus displaying the image. Thus, since a TN-mode liquid crystal cell has a relat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/13363
CPCB32B27/32G02B5/30G02F1/1335
Inventor 猪口雄平金仁基琚立阳黑岩秀夫东浩二
Owner SUMITOMO CHEM CO LTD
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