Pressure-sensitive adhesive layer attached polarizing film set, liquid crystal panel and liquid crystal display device

A technology of adhesive layer and liquid crystal panel, which is applied in optics, instruments, nonlinear optics, etc., can solve problems such as uneven display and warpage, and achieve the effects of stable humidity expansion coefficient, warpage suppression, and small change

Active Publication Date: 2016-10-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the liquid crystal panel may be warped due to the shrinkage and expansion of the polarizer accompanying changes in the humidification environment.
In addition, there is also a risk of the above-mentioned warping when stored at room temperature and humidity
Warpage generated in liquid crystal panels causes display unevenness in liquid crystal display devices

Method used

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  • Pressure-sensitive adhesive layer attached polarizing film set, liquid crystal panel and liquid crystal display device
  • Pressure-sensitive adhesive layer attached polarizing film set, liquid crystal panel and liquid crystal display device
  • Pressure-sensitive adhesive layer attached polarizing film set, liquid crystal panel and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0097] Hereinafter, examples of the present invention will be described, but embodiments of the present invention are not limited to these examples.

[0098]

[0099] A polyvinyl alcohol film with an average degree of polymerization of 2400, a degree of saponification of 99.9 mol%, and a thickness of 30 μm is immersed in warm water at 30°C, and uniaxially stretched while swelling it until the length of the PVA-based resin film reaches 2.0 times the original length . Next, it was dipped in a 0.3% by weight (weight ratio: iodine / potassium iodide = 0.5 / 8) iodine solution at 30° C., and dyed while uniaxially stretching the PVA-based resin film until its length reached 3.0 times the original length. After that, it was stretched in an aqueous solution of 4% by weight of 6 boric acid and 5% by weight of potassium iodide until the length of the PVA-based resin film became 6 times the original length. Further, after performing iodide ion impregnation treatment with a 3% by weight po...

Embodiment 3

[0120]

[0121] While applying a polyvinyl alcohol-based adhesive to the surface of the polarizing film (thickness 5 μm) of the above-mentioned optical film laminate so that the thickness of the adhesive layer becomes 0.1 μm, the first transparent protective film (b11) was attached. , followed by drying at 50° C. for 5 minutes.

[0122] Next, after peeling off the amorphous PET substrate, an active energy ray-curable adhesive is applied on the peeled surface so that the thickness of the adhesive layer becomes 1 μm, and a second transparent protective film (film 12: The side of the above-mentioned film E on which the surface treatment layer is not provided) was cured with ultraviolet rays to produce a first polarizing film using a thin polarizing film.

[0123]

[0124] After applying an active energy ray-curable adhesive to the surface of the polarizing film (5 μm in thickness) of the optical film laminate so that the thickness of the adhesive layer becomes 1 μm, and attac...

Embodiment 1～6、 comparative example 1～5

[0140]

[0141] Take out the liquid crystal panel (70 mm in length, 130 mm in width) from the liquid crystal display device [liquid crystal panel of smartphone (screen size: 5.8 inches:)] including the liquid crystal cell in IPS mode, remove all the optical films placed on the upper and lower sides of the liquid crystal cell, The glass surfaces (front and back) of the above-mentioned liquid crystal cell were cleaned. In this way, a liquid crystal cell (70 mm in length and 130 mm in width) was prepared.

[0142]

[0143] The first adhesive layer was transferred on the first transparent protective film (b11) side of the first polarizing film to prepare a polarizing film with the first adhesive layer. In addition, the second adhesive layer was transferred to the second polarizer side of the second polarizing film, and on the other hand, the brightness improving film was bonded on the first transparent protective film (b21) side via the third adhesive layer (but , Except for Co...

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Abstract

The invention provides a polarizing film set which is used for controlling the decrease of warping under normal temperature and humidity. The polarizing film set is provided with a polarizing film with a first adhesive layer, and a polarizing film with a second adhesive layer, wherein the polarizing film with the first adhesive layer is configured at an observation side of a liquid crystal unit in an IPS mode, and the polarizing film with the second adhesive layer is configured at a back side of the liquid crystal unit. The first polarizing film of the polarizing film with the first adhesive layer is a first transparent protection film (b11) which is located at one side of a first polaroid with the thickness being less than 25 microns, and has the humidity expansion coefficient (1.0*10<-6> / %RH). The other side is provided with a surface treatment layer, and the first transparent protection film (b11) is configured at the liquid crystal unit side.

Description

technical field [0001] The invention relates to a polarizing film group with an adhesive layer applied on both sides of a liquid crystal cell. Moreover, this invention relates to the liquid crystal panel which applied the said polarizing film group with an adhesive layer to both sides of a liquid crystal cell. The liquid crystal panel can form a liquid crystal display device. The above-mentioned liquid crystal panel and liquid crystal display device can be applied to various applications, for example, they can be used together with an input device such as a touch panel applied to the observation side of the liquid crystal display device. As the above-mentioned touch panel, touch panels of an optical system, an ultrasonic system, an electrostatic capacity system, a resistive film system, or the like can be suitably used. It is especially suitable for touch panels using the electrostatic capacitance method. The above-mentioned touch panel is not particularly limited, and is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B1/14
CPCG02F1/133528G02B1/14
Inventor 品川玲子伊崎章典木村启介吉村和也
Owner NITTO DENKO CORP
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