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Polarizing plate and liquid crystal display device using the same

A technology of polarizing plate and polarizing element, applied in the field of polarizing plate, can solve the problems of large thermal expansion coefficient, dimensional change, small specific gravity of substrate, etc.

Inactive Publication Date: 2005-03-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, a liquid crystal display device using a plastic substrate can be light and thin because the specific gravity of the substrate is smaller than that of a glass substrate. produce dimensional changes

Method used

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  • Polarizing plate and liquid crystal display device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Dissolve the PVA powder with an average degree of polymerization of 1700 and an average degree of saponification of 97.0% moles in pure water, adjust it to a 10% by mass aqueous solution, apply this aqueous solution to a polyester film, and dry it at 50°C for 2 hours, then dry it at 130°C. ℃ for 30 minutes to obtain a PVA film with a thickness of 40 μm. The obtained film was swollen under warm water at 30° C. for 1 minute, and then immersed in an aqueous solution of potassium iodide / iodine (mass ratio 10:1) at 30° C. to extend to 2 times. Next, in a 4% by mass boric acid solution at 50°C, the total elongation was tripled, then immersed in water at 30°C, washed, and dried at 50°C for 4 minutes to obtain a polarizing element with a thickness of 13 μm. The concentration of the aqueous solution of potassium iodide / iodine (mass ratio 10:1) ensured that the iodine concentration was 0.35% by mass so that the transmittance of the polarizing element became 44%.

Embodiment 2

[0068] Dissolve the PVA powder with an average degree of polymerization of 1700 and an average degree of saponification of 97.0% moles in pure water, adjust it to a 10% by mass aqueous solution, apply this aqueous solution to a polyester film, and dry it at 50°C for 2 hours, then dry it at 130°C. ℃ for 30 minutes to obtain a PVA film with a thickness of 50 μm. The obtained film was swollen under warm water at 30° C. for 1 minute, and then immersed in an aqueous solution of potassium iodide / iodine (mass ratio 10:1) at 30° C. to extend to 2 times. Next, in a 4% by mass boric acid solution at 50° C. to achieve a total elongation of 3 times, then immersed in water at 30° C., washed, and dried at 50° C. for 4 minutes to obtain a polarizing element with a thickness of 18 μm. The concentration of the aqueous solution of potassium iodide / iodine (mass ratio 10:1) ensured that the iodine concentration was 0.33% by mass so that the transmittance of the polarizing element became 44%.

Embodiment 3

[0070] The film with a thickness of 40 μm obtained in Example 1 was swelled in warm water at 30° C. for 1 minute, then immersed in an aqueous solution of potassium iodide / iodine (mass ratio 10:1) at 30° C., and extended to 3 times. Next, in a 4% by mass boric acid solution at 50° C. to achieve a total elongation of 5.5 times, then immersed in water at 30° C., washed, and dried at 50° C. for 4 minutes to obtain a polarizing element with a thickness of 9 μm. The concentration of the aqueous solution of potassium iodide / iodine (mass ratio 10:1) ensured that the iodine concentration was 0.37% by mass so that the transmittance of the polarizing element became 44%.

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Abstract

The present invention provides a polarizer and a polarizing plate having less dimensional changes to heat stress. The present invention provides also a liquid crystal display that includes the polarizer and the polarizing plate, and is free of color irregularity or decoloration. The polarizer has shrinkage force of not more than 4.0 N / cm in the absorption axis direction after being heated at 80 DEG C. for 30 minutes. A protective film is laminated on at least one surface of the polarizer in order to form a polarizing plate, and the polarizing plate has a following relationship of 0.01<=A / B<=0.16 when A denotes a thickness of the polarizer and B denotes a thickness of the protective film.

Description

technical field [0001] The present invention relates to a polarizing plate used on a liquid crystal display device (abbreviated as LCD hereinafter) and a liquid crystal display device using the polarizing plate. Background technique [0002] LCDs are used in personal computers and the like, and their demand has rapidly increased in recent years. LCDs are being used in a wide range of applications, and in recent years they have also been used in monitors. [0003] However, polarizers used in LCDs are manufactured in such a way that polyvinyl alcohol (hereinafter referred to as PVA) films are dyed with dichroic iodine or a dichroic dye, cross-linked with boric acid or borax, etc. step and the stretching step of uniaxial stretching are then dried, and the dried film is bonded to a protective film (protective layer) such as a triacetyl cellulose (hereinafter referred to as TAC) film. [0004] The steps of dyeing, cross-linking and elongation do not need to be carried out separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B7/00G02F1/1335
CPCY10T428/31935G02F1/133528G02F2201/50Y10T428/24942G02F2201/54G02B7/008G02B5/3033Y10T428/3188Y10T428/1041C09K2323/031G02F1/133504
Inventor 杉野洋一郎济木雄二近藤千里滨本英二楠本诚一三原尚史土本一喜
Owner NITTO DENKO CORP
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