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Polarizing plate and liquid crystal display device

A technology of liquid crystal display devices and polarizing plates, which is applied in polarizing elements, optics, instruments, etc., and can solve problems such as irregular polarizing plate end faces, large polarizing plate damage, and polarizing plate cracks

Active Publication Date: 2017-09-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the end of the polarizing plate is ground in order to obtain high dimensional accuracy, for a polarizing plate formed by bonding a protective film on only one side of the polarizing plate, the damage applied to the polarizing plate during grinding is large, and there is a polarizing plate. Irregularity of the end face, the tendency of the polarizer to crack easily during the durability test

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

[0110] 100 polarizing plates were stacked, placed in a cutting device so that the polarizing film was on the upper side of the protective film, and the end faces were cut from the polarizing film side to the protective film side to perform cutting processing. As a result of the cutting, the end face of the polarizing plate is inclined relative to the thickness direction of the polarizing plate, and the end of the polarizing film on the opposite side of the bonding surface to which the protective film is bonded is larger than the end of the protective film on the side farther away from the polarizing film. The edge entered 6 μm inward.

[0111] The end shape of the polarizing plate confirmed by the 3D measurement laser microscope is shown in Figure 9 middle. After implementing the thermal shock test, it was found that zero cracks were observed in the polarizing film.

Embodiment 2

[0113]Face cutting was performed in the same manner as in Example 1, except that triacetyl cellulose (Konica Minolta Precision Optical Co., Ltd., ZeroTAC, thickness 20 μm) saponified the protective film was used. As a result of the cutting, the end face of the polarizing plate is inclined relative to the thickness direction of the polarizing plate, and the end of the polarizing film on the opposite side of the bonding surface to which the protective film is bonded is larger than the end of the protective film on the side farther away from the polarizing film. The edge entered 9 μm inward. The end shape of the polarizing plate confirmed by the 3D measurement laser microscope is shown in Figure 10 middle. After implementing the thermal shock test, it was found that zero cracks were observed in the polarizing film.

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Abstract

The invention provides a polarizing plate having a protective film on only one side of a polarizer and a liquid crystal display device, wherein a polarizing plate is less prone to cracks during a durability test. A polarizing plate (1) includes a polarizer (2) and a protective film (3) laminated on only one surface of the polarizer (2). The end face (2a) of the polarizer (2) and the end face (3a) of the protective film (3) have an inclination with respect to the thickness direction of the polarizing plate (1) and the end face (2a) of the polarizer (2) is disposed inside the end face (3a) of the protective film (3) positioned. Due to such end shape, the end face (2a) of the polarizer (2) is less likely to be exposed to physical stimulation from the external environment.

Description

technical field [0001] The present invention relates to a polarizing plate and a liquid crystal display device. Background technique [0002] In recent years, thinner liquid crystal panels for liquid crystal displays have been pursued. Polarizers used in liquid crystal panels are generally brittle and easily broken. Therefore, in order to protect the polarizers, protective films are attached to both surfaces of the polarizers to form polarizers, and the polarizers are attached to the liquid crystal cell. In this case, the end of the polarizing plate is usually ground to improve the dimensional accuracy of the polarizing plate (for example, refer to Patent Document 1). [0003] In order to attach the polarizing plate to the liquid crystal cell, a pressure-sensitive adhesive is generally used. That is, a separator (release film) is bonded to an unused polarizing plate via a pressure-sensitive adhesive layer (for example, refer to Patent Document 2), and when the polarizing p...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3033G02F1/133528G02F1/133536G02B5/3041
Inventor 市原正宽铃木到
Owner SUMITOMO CHEM CO LTD
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