Composite polarizing plate, laminated optical member, and image display device using them

A technology of polarizers and polarizers, used in polarizing elements, optical elements, optics, etc., can solve problems such as insufficient cohesion of adhesives, and achieve the effects of improving visual recognition, reducing the number of parts, and suppressing poor durability.

Active Publication Date: 2010-07-21
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the usual light-diffusing pressure-sensitive adhesive layer in which a light-diffusing agent is mixed with an adhesive, there is a problem in terms of durability due to insufficient cohesive force of the adhesive used as the base.

Method used

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  • Composite polarizing plate, laminated optical member, and image display device using them
  • Composite polarizing plate, laminated optical member, and image display device using them
  • Composite polarizing plate, laminated optical member, and image display device using them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0174] (a) Polarizing plate with pressure-sensitive adhesive layer

[0175] Prepare a polarizer made of a 25 μm thick film in which iodine is adsorbed and oriented in polyvinyl alcohol, and a transparent protective layer made of a 40 μm thick triacetate cellulose film is bonded to one side of the polarizer via an epoxy-based adhesive Polarizing film. Lay the pressure-sensitive adhesive layer A on its polarizer side to make a structure with a pressure-sensitive adhesive layer of transparent protective layer / polarizer / pressure-sensitive adhesive layer A / peeling film Polarizing film.

[0176] (b) Retardation plate with pressure-sensitive adhesive layer

[0177] Formed from a stretched film of a norbornene-based resin, with a thickness of 40 μm and an in-plane retardation of 140 nm ("Escina Film" manufactured by Sekisui Chemical Co., Ltd.) (λ / 4 plate) The above-mentioned light-diffusing pressure-sensitive adhesive layer A was bonded on one side to produce a phase difference pla...

Embodiment 2

[0185] (a) Polarizing plate with pressure-sensitive adhesive layer

[0186] In the same manner as in (a) of Example 1, a polarizing plate with a pressure-sensitive adhesive layer having a structure of transparent protective layer / polarizer / pressure-sensitive adhesive layer A / peeling film was produced.

[0187] (b) Retardation plate with pressure-sensitive adhesive layer

[0188] Prepare a retardation plate (manufactured by Sekisui Chemical Co., Ltd. " A phase difference plate (λ / 2 plate) with a pressure-sensitive adhesive layer laminated with an acrylic pressure-sensitive adhesive with a thickness of 15 μm on one side of the “Escina film”) (λ / 2 plate). In addition, a retardation plate (manufactured by Sekisui Chemical Co., Ltd.) with a thickness of 28 μm was produced by forming a stretched film of a norbornene-based resin and having an in-plane phase difference of λ / 4 of 90 nm with respect to the light wavelength λ. "Essina film") (λ / 4 plate) is bonded to one side of the lig...

Embodiment 3

[0195] (a) Polarizing plate with pressure-sensitive adhesive layer

[0196] In the same manner as in (a) of Example 1, a polarizing plate with a pressure-sensitive adhesive layer having a structure of transparent protective layer / polarizer / pressure-sensitive adhesive layer A / peeling film was produced.

[0197] (b) Retardation plate with pressure-sensitive adhesive layer

[0198] Formed from a stretched film of norbornene-based resin, it has an in-plane retardation of λ / 2 of 270 nm with respect to the wavelength λ of light, and a retardation plate with a thickness of 33 μm ("Esshi" manufactured by Sekisui Chemical Co., Ltd.) On one side of the film ") (λ / 2 plate), the light-diffusing pressure-sensitive adhesive layer A was bonded to produce a phase difference plate (λ / 2 plate) with a pressure-sensitive adhesive layer. In addition, in the form of a stretched mold of norbornene-based resin, a phase difference plate having an in-plane phase difference of λ / 4 of 90 nm with respect...

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Abstract

This invention provides a composite polarizing plate comprising a polarizer, a phase difference plate, and a pressure sensitive adhesive layer. The composite polarizing plate is thin and light in weight, can ensure brightness of an image display device to which the composite polarizing plate has been applied, is less likely to cause blurred or unsharp display images, and can develop good durability. A transparent protective layer (2) is disposed on one side of a polarizer (1) formed of a polyvinyl alcohol resin film, and at least one phase difference plate (5) is stacked on the other side of the polarizer (1) through a first pressure sensitive adhesive layer (6). A second pressure sensitive adhesive layer (7) is disposed on the outer side of the phase difference plate located at a position most remote from the polarizer (1) to provide a composite polarizing plate (11). At least one layer of the first pressure sensitive adhesive layer (6), the second pressure sensitive adhesive layer (7), and pressure sensitive adhesive layers located between the first pressure sensitive adhesive layer (6) and the second pressure sensitive adhesive layer (7) contains a light diffusing agent and is formed of a light diffusive pressure sensitive adhesive layer having a storage modulus of 0.15 to 10 MPa at 23 DEG C. This composite polarizing plate (11) is used in combination with an image display element such as a liquid crystal cell (30) to provide an image display device.

Description

technical field [0001] The present invention relates to a composite polarizing plate including a polarizer, a phase difference plate and a pressure-sensitive adhesive layer. The present invention also relates to a laminated optical component in which the composite polarizing plate is laminated on another optical layer, and an image display in which the composite polarizing plate or the laminated optical component is combined with an image display element such as a liquid crystal cell. device. Background technique [0002] Liquid crystal display devices have been developed from conventional use in desktop computers and electronic clocks, and their applications have rapidly expanded in recent years. That is, from mobile communication devices such as mobile phones to large TVs, liquid crystal display devices are being used regardless of the size of the screen. In addition, in addition to liquid crystal display devices, organic electroluminescent (organic EL) display devices a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F2201/50G02F1/133528G02B5/3033G02B5/305G02F2202/28G02F2001/133638G02F1/133638
Inventor 河村崇仁黑川敦史又野仁小林真盛
Owner SUMITOMO CHEM CO LTD
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