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Polarization plate and liquid crystal device using the same

A technology of liquid crystal display devices and polarizing plates, which is applied to polarizing elements, instruments, and layered products, can solve problems such as poor identification, uneven color, and uneven interference, and achieve suppression of uneven color, prevention of thinning, and mechanical The effect of increasing strength

Active Publication Date: 2013-06-05
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a stretched polyethylene terephthalate film is used as a protective film, color unevenness (also called interference unevenness, rainbow unevenness) is conspicuous when it is placed in a liquid crystal display device and the image is observed. , the problem of poor identification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Immerse a polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm in pure water at 30°C, and then dip it in pure water at 30°C with a weight ratio of iodine / potassium iodide / water of 0.02 / 2 / 100 in aqueous solution. Then, it was immersed in the aqueous solution whose weight ratio of potassium iodide / boric acid / water was 12 / 5 / 100 at 56.5 degreeC. Next, after washing with pure water at 8°C, it was dried at 65°C to obtain a polarizing film in which iodine was adsorbed and oriented in polyvinyl alcohol. Stretching is mainly carried out in the process of iodine dyeing and boric acid treatment, and the total stretching ratio is 5.3 times.

[0082] On one side of the polarizing film obtained in this way, a stretched polyethylene terephthalate film with a thickness of 45 μm is bonded via a photocurable adhesive after the corona treatment is carried out on the bonding surface. (Off...

Embodiment 2

[0085] A polarizing plate was produced in the same manner as in Example 1, except that a stretched polyethylene terephthalate film whose orientation axis was deviated from an angle of 5 degrees with respect to the stretching axis and whose MOR was 3.4 was used This polarizing plate produces a liquid crystal display device. When the obtained liquid crystal display device was visually observed, the color unevenness (interference unevenness) in the oblique direction was small and the visibility was good. In addition, the warpage of the liquid crystal panel is also small.

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PUM

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Abstract

A polarizing plate and a liquid crystal display device using the same are provided to prevent deflection by improving mechanical intensity of a liquid crystal panel. A polarizing plate includes a polarizing film and an oriented polyethylene terephthalate film. The polarizing film is made of polyvinyl alcohol resin. The oriented polyethylene terephthalate film is laminated in one side of the polarizing film by interposing an adhesive layer. A deflection angle about an oriented axis of a major axis of the oriented polyethylene terephthalate film is less than 10 degree. A MOR(Maximum Oriented Ratio) value measured by a microwave transmitting type orientation system is more than 1.5.

Description

technical field [0001] The present invention relates to a polarizing plate obtained by laminating and stretching a polyethylene terephthalate film on one side of a polarizing film made of polyvinyl alcohol resin through an adhesive layer, and a liquid crystal display device using the polarizing plate. Background technique [0002] The composition of the polarizing plate is usually: on one or both sides of a polarizing film made of polyvinyl alcohol resin after absorbing an alignment dichroic dye, a protective film (for example, represented by triacetyl cellulose) is laminated through an adhesive layer. protective film of cellulose acetate). A polarizing plate having such a laminated structure is bonded to a liquid crystal cell with an adhesive via other optical films as necessary, and becomes a component of a liquid crystal display device. [0003] Liquid crystal display devices are rapidly expanding in use as thin display devices such as liquid crystal televisions, liquid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B7/12B32B27/08G02F1/1335
CPCB32B7/02G02B5/3033G02F1/133528
Inventor 林成年矢可部公彦
Owner SUMITOMO CHEM CO LTD