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Polarizing plate and liquid crystal display device

A technology of polarizing plate and polarizing plate, applied in the field of polarizing plate and liquid crystal display device, can solve the problems of uneven display of the panel, change of phase difference, etc.

Inactive Publication Date: 2017-02-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a high-humidity environment, triacetyl cellulose, which is generally used as a transparent protective film, has a problem in that the phase difference changes greatly, causing display unevenness on the panel.

Method used

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  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185] (production of polarizing plate)

[0186] A film in which the above-mentioned adhesive was applied to one side of the above-mentioned transparent protective film 1A so that the thickness of the dried adhesive layer became 80 nm was prepared. A film in which the above-mentioned adhesive was applied to one surface of the above-mentioned retardation film 2A so that the thickness of the dried adhesive layer became 80 nm was prepared. In addition, the application of the adhesive was carried out under the temperature condition of 23° C. 30 minutes after its preparation. Then, after laminating the transparent protective film 1A with adhesive and the retardation film 2A on both sides of the polarizer with a roller pressing machine at a temperature of 23°C, dry at 80°C for 10 minutes to make the adhesive layers on both sides Cured to make a polarizing plate.

Embodiment 2～7、 comparative example 1～3

[0188] In Example 1, a polarizing plate was produced in the same manner as in Example 1, except that the types of the transparent protective film and the retardation film were changed as shown in Table 1 at the time of preparation of the polarizing plate.

[0189] (Evaluation)

[0190] The obtained polarizing plate was evaluated as follows. The results are shown in Table 1.

[0191] (uneven display)

[0192] The polarizing plate was cut into 160 mm x 90 mm so that the absorption axis of the polarizing plate was 0° with respect to the long side. An acrylic pressure-sensitive adhesive layer was pasted on the laminated film surface (optical compensation layer side) of the polarizing plate. This polarizing plate with an adhesive layer was pasted on both surfaces of a glass plate so that the absorption axis of the polarizing plate (polarizer) was perpendicular to each other, and the resulting member was used as a sample. A heat test (80° C., 100 hours) and a humidity test (60° ...

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Abstract

It is an object of the present invention to provide a polarizing plate which can suppress display unevenness and yellow discoloration even when being applied to a liquid crystal panel and prevent a change in oblique hue, and a liquid crystal display device including the polarizing plate. A polarizing plate includes: a polyvinyl alcohol-based polarizer; a transparent protective film provided on one surface of the polyvinyl alcohol-based polarizer with an adhesive layer interposed therebetween; and a retardation film provided on the other surface of the polarizer with an adhesive layer interposed therebetween. The transparent protective film contains a (meth)acrylic resin and an ultraviolet absorber. The retardation film contains a cellulose resin and has an in-plane retardation of 5 nm or less and a thickness-direction retardation of 10 nm or less.

Description

technical field [0001] The invention relates to a polarizing plate and a liquid crystal display device. Background technique [0002] A liquid crystal display is a device that visualizes the state of polarization caused by the switching of liquid crystals. Based on its display principle, a polarizing plate is used in which a transparent protective film is bonded to both sides of the polarizing plate with an adhesive layer. As a polarizer, for example, an iodine-based polarizer having a structure in which iodine is adsorbed on polyvinyl alcohol and stretched is widely used as the most common polarizer because of its high transmittance and high degree of polarization. As the transparent protective film, triacetyl cellulose with high moisture permeability or the like is used. [0003] Image display devices such as liquid crystal display devices to which the polarizing plate is applied are used in various environments. Therefore, the polarizing plate is desired to have durabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14G02F1/1335G02F1/1343
CPCG02B5/305G02B5/3083G02F1/133528G02F1/134363G02B1/14G02B5/208G02B5/3033G02F1/13363G02B1/16B32B7/12B32B23/08B32B27/08B32B27/306B32B27/308B32B2551/00G02B5/3041
Inventor 中田美惠村山俊介大峰俊树山下智弘
Owner NITTO DENKO CORP
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