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Polarizing plate and image display device using same

A technology of polarizing plate and polarizing element, which can be used in identification devices, polarizing elements, lighting devices, etc., can solve the problem of insufficient suppression effect, and achieve the effect of small reduction in transmittance, excellent high temperature durability, and suppression of transmittance reduction.

Pending Publication Date: 2022-07-12
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, even with this method, the effect of suppressing the decrease in transmittance in the high-temperature durability test is insufficient.

Method used

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  • Polarizing plate and image display device using same
  • Polarizing plate and image display device using same
  • Polarizing plate and image display device using same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 》

[0048]The polarizing plate of the first embodiment of the present invention has a polarizing element obtained by adsorbing iodine to a polyvinyl alcohol-based resin layer and orienting iodine, and includes at least one selected from the group consisting of urea, urea derivatives, thiourea, and thiourea derivatives. A urea-based compound layer of a urea-based compound, and a transparent protective film. The polarizing plate of this embodiment has the characteristic of at least one of the following (a) and (b).

[0049] (a) The moisture content of the polarizing element is equal to or more than the equilibrium moisture content at a temperature of 20°C and a relative humidity of 30%, and is equal to or less than an equilibrium moisture content at a temperature of 20°C and a relative humidity of 50%.

[0050] (b) The moisture content of the polarizing plate is equal to or more than the equilibrium moisture content at a temperature of 20°C and a relative humidity of 30%, and is equ...

no. 2 Embodiment approach 》

[0141] A polarizing plate according to a second embodiment of the present invention includes a polarizing element which is formed by adsorbing iodine to a polyvinyl alcohol-based resin layer and orienting iodine, and includes a polarizing element selected from the group consisting of urea, urea derivatives, sulfur At least one urea-based compound among urea and thiourea derivatives. The polarizing plate of this embodiment has the characteristic of at least one of the following (a) and (b).

[0142] (a) The moisture content of the polarizing element is equal to or more than the equilibrium moisture content at a temperature of 20°C and a relative humidity of 30%, and is equal to or less than an equilibrium moisture content at a temperature of 20°C and a relative humidity of 50%.

[0143] (b) The moisture content of the polarizing plate is equal to or more than the equilibrium moisture content at a temperature of 20°C and a relative humidity of 30%, and is equal to or less than a...

Embodiment 1～9、 comparative example 1～6

[0187] In Examples 1 to 9 and Comparative Examples 1 to 6, the optical laminates shown in Table 2 were used. Stored for 72 hours under the conditions of ℃ and relative humidity of 35%, 40%, 45%, 50% or 55%. The moisture content of the optical laminate can be considered to be in equilibrium with the moisture content of the storage environment, and the moisture content of the polarizing plate and the polarizing element in the optical laminate can also be considered to be the same as the moisture content of the optical laminate.

[0188] (Polarizing plate for inspection 1)

[0189] An acrylic pressure-sensitive adhesive (manufacturer: LINTEC Co., Ltd., model number: #7) was laminated only on one side of the polarizing plate 1, and the polarizing plate 1 for inspection was produced. The polarizing plate 1 for inspection produced in this way was cut into a size of 50 mm × 100 mm so that the short side was parallel to the absorption axis, and the surface of the pressure-sensitive a...

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Abstract

The purpose of the present invention is to provide a polarizing plate which is capable of suppressing a decrease in transmittance in a high-temperature environment even when used in an image display device constituted by interlayer filling. The present invention provides a polarizing plate having a polarizing element in which iodine is adsorbed on a polyvinyl alcohol-based resin layer and the iodine is oriented, and a transparent protective film, the polarizing plate having a urea-based compound-containing layer containing at least one urea-based compound selected from the group consisting of urea, urea derivatives, thiourea, and thiourea derivatives, the moisture content of the polarizing element is equal to or greater than the equilibrium moisture content at a temperature of 20 DEG C and a relative humidity of 30%, and equal to or less than the equilibrium moisture content at a temperature of 20 DEG C and a relative humidity of 50%.

Description

technical field [0001] The present invention relates to a polarizing plate. Furthermore, the present invention relates to an image display device in which one surface of the polarizing plate is bonded to an image display unit, and the other surface is bonded to a transparent member such as a touch panel and a front panel. Background technique [0002] Liquid crystal display devices (LCDs) are widely used not only in liquid crystal televisions, but also in mobile devices such as personal computers and mobile phones, and in vehicle applications such as navigators. Generally, a liquid crystal display device has a liquid crystal panel member to which polarizing plates are bonded by an adhesive on both sides of a liquid crystal cell, and displays by controlling light from a backlight member by the liquid crystal panel member. In addition, in recent years, organic EL display devices have also been widely used for in-vehicle applications such as mobile devices such as televisions ...

Claims

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Application Information

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IPC IPC(8): G02B5/30C09J11/06C09J129/04G02F1/1335G09F9/00G09F9/30H01L27/32H01L51/50H05B33/02
CPCB32B7/023B32B27/30B32B27/42C09J11/06C09J129/04C09J201/00G02B5/30G02F1/1333G02F1/1335G06F3/041G09F9/00H05B33/02G09F9/30H10K59/8791G02B5/3041G02F1/133528
Inventor 福田谦一内藤亮
Owner SUMITOMO CHEM CO LTD
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