Liquid crystal display device and polarizing plate used in the same

A polarizing plate and polarizing film technology, which is applied in the field of liquid crystal display devices, can solve problems such as uneven color, and achieve the effects of excellent cost performance or productivity, thinning, and excellent visibility

Active Publication Date: 2010-12-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present inventor has carried out intensive research in order to solve the above-mentioned uneven color problem, until the completion of the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0252] (a) Production of polarizing film

[0253] After immersing 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, the film is immersed at 30°C in an iodine / potassium iodide / water weight ratio of 0.02 / 2 / 100 in aqueous solution. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 12 / 5 / 100 at 56.5°C. Subsequently, it was washed with pure water at 8° C., and then 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 maximum stretching ratio is 5.3 times.

[0254] (b) Fabrication of polarizing plate with adhesive

[0255] On one side of the polarizing film obtained in the above (a), corona treatment was performed on the bonding surface, and...

Embodiment 2

[0260] Use Nz factor of 4, R 0 A stretched polyethylene terephthalate film of 1500 nm is glued so that the angle of deviation between the transmission axis of the polarizing film and the lag phase axis of the stretched polyethylene terephthalate film is 40 degrees In addition, it carried out similarly to Example 1 (b) except this, and produced the polarizing plate. Furthermore, except having used this polarizing plate as a back side polarizing plate, it carried out similarly to Example 1 (c), and produced the liquid crystal display device. The obtained liquid crystal display device was visually observed, and the oblique color unevenness (interference unevenness) was small and the visibility was good.

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Abstract

The invention provides a polarization board with polyvinyl alcohol resin and a stretched polyethylene glycol terephthalate mask laminated on one single face of the polarization board through a first adhesive layer wherein the refractive index of b arranged in the stretched polyethylene glycol terephthalate mask is defined as nx; the refractive index of the orthogonal direction with slow axis is defined as ny; the refractive index of the thickness direction is defined as nz. The coefficient of Nz represented by formula (nx-nz) / (nx-ny) is above 4.

Description

technical field [0001] The invention relates to a polarizing plate and a liquid crystal display device using the polarizing plate. Background technique [0002] In recent years, light-weight and thin liquid crystal display devices with low power consumption, low-voltage operation, and information have rapidly spread as information display devices such as mobile phones, portable information terminals, computer monitors, and televisions. Furthermore, with the development of liquid crystal technology, various modes of liquid crystal display devices have been proposed, gradually solving the problems of conventional liquid crystal displays such as response speed, contrast ratio, and viewing angle. [0003] On the other hand, in response to strong demand for thinner and lighter liquid crystal devices in the market, liquid crystal panels, diffusion plates, backlight units, and driver ICs constituting liquid crystal display devices are becoming thinner or smaller. Under such circum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/30
CPCB32B27/306C09J129/04G02B1/04G02B1/111G02B5/305G02B5/3083G02F1/133528
Inventor 明松佳美矢可部公彦金奉春
Owner SUMITOMO CHEM CO LTD
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