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Optical film with adhesive on both sides and method for fabrication of image display device employing same

An image display device, optical film technology, applied in the direction of adhesive types, chemical instruments and methods, ester copolymer adhesives, etc., can solve the problem of reducing the visibility of the image display device, increasing the reflection or refraction at the interface, etc. problems, and achieve the effects of suppressing the positional deviation of components or the protrusion of adhesive, suppressing the generation of air bubbles, and simplifying the manufacturing process.

Active Publication Date: 2015-08-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the refractive index of air in the air gap structure is about 1, whereas the refractive index of plastic or glass materials such as polarizing plates or front transparent members constituting the image display panel is about 1.5, so the reflection at the interface or Increased refraction
Therefore, in the image display device having the air gap structure, there is a problem that the diffusion and scattering of the image light emitted from the image display panel or the reflection of external light such as sunlight are likely to occur, thereby reducing the visibility of the image display device.

Method used

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  • Optical film with adhesive on both sides and method for fabrication of image display device employing same
  • Optical film with adhesive on both sides and method for fabrication of image display device employing same
  • Optical film with adhesive on both sides and method for fabrication of image display device employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135]

[0136] A polarizing plate (degree of polarization: 99.995%) was used in which a polarizer made of a stretched polyvinyl alcohol film impregnated with iodine and having a thickness of 25 μm was bonded to both sides of a polarizer. The transparent protective film on one side of the polarizer (image display unit side) is a retardation film containing a triacetyl cellulose film with a thickness of 40 μm, and the transparent protective film on the other side (visible side) is a triacetyl cellulose with a thickness of 60 μm film.

[0137]

[0138] (Preparation of Base Polymer)

[0139] In a detachable flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen inlet tube, put 97 parts of butyl acrylate, 3 parts of acrylic acid, 0.2 parts of azobisisobutyronitrile as a polymerization initiator, and 233 parts of ethyl acetate ester, and then nitrogen gas was introduced, and nitrogen replacement was carried out for about 1 hour while stirring. Then, ...

Embodiment 2、3

[0160] An adhesive composition (solution) having the composition shown in Table 1 was prepared as the visible side adhesive layer B. As a tackifier, a styrene oligomer ("YS Resin SX-85" manufactured by Yasuhara Chemical Co., Ltd., softening point 85°C) was used in Example 2, and a nuclear hydrogenated terpene phenol (Yasuhara Chemical Co., Ltd.) was used in Example 3. "YS Polyster NH" manufactured by Kagaku Co., Ltd., softening point: 130°C). In addition, the adhesives of Examples 2 and 3 contain phenyl glycidyl ether acrylate ("New Frontier PGA" manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) as a photopolymerizable acrylic monomer, and contain 1-hydroxyl Cyclohexyl phenyl ketone ("Irgacure 184" manufactured by Ciba Specialty Chemicals) was used as a photo-curable adhesive as a photo radical generator.

[0161] A polarizing plate with an adhesive on both sides was produced in the same manner as in Example 1 except that a photocurable adhesive layer having the composi...

Embodiment 4～6

[0163] (Preparation of Base Polymer)

[0164] In a detachable flask with a thermometer, a stirrer, a reflux condenser and a nitrogen inlet tube, put 75 parts by weight of 2-ethylhexyl acrylate (2EHA), 25 parts of hydroxyethyl acrylate (HEA), 0.2 parts as a polymerization Azobisisobutyronitrile and 233 parts by weight of ethyl acetate were used as initiators, and then nitrogen gas was introduced, and nitrogen replacement was performed for about 1 hour while stirring. Then, the flask was heated to 70° C. and reacted for 5 hours to obtain an acrylic polymer having a weight average molecular weight (Mw) of 700,000 (hereinafter, this base polymer is referred to as “polymer 2”).

[0165]

[0166]Using the above polymer 2, adhesive compositions (solutions) having the compositions shown in Table 1 were prepared. A double-sided adhesive-attached polarizing plate was produced in the same manner as in Example 1 except that an adhesive layer having the composition and thickness shown i...

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Abstract

This optical film with adhesive on both sides comprises: an optical film, further comprising a polarizing sheet; a first adhesive layer which is disposed on a face of the optical film which is a side which is pasted upon an image display cell; and a second adhesive layer which is disposed on a face of the optical film which is a side which is pasted upon a transparent plate or a touch panel. The first adhesive layer and the second adhesive layer respectively have detachable protective sheets adhered thereupon. It would be desirable for the second adhesive layer to have a thickness of 30µm or more. This optical film with adhesive on both sides would be usable, as an example, positioned between the transparent plate or the touch panel and the image display cell.

Description

technical field [0001] The present invention relates to an adhesive-attached optical film for forming an image display device having a transparent plate or a touch panel on the front surface of an image display panel. The present invention also relates to a method of manufacturing an image display device using the adhesive-attached optical film. Background technique [0002] Liquid crystal display devices and organic electroluminescent (EL) display devices are widely used as various image display devices such as mobile phones, navigation devices, monitors for computers, and televisions. A liquid crystal display device is provided with a polarizing plate on a viewable side surface of an image display unit according to its display principle. In addition, in an organic electroluminescent display device, in order to suppress external light from being reflected by a metal electrode (cathode) and make it look like a mirror, a circular polarizing plate (polarizing plate and 1 / 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C09J4/02C09J7/02C09J133/06C09J201/00G02F1/1333H01L51/50H05B33/02H05B33/10C09J7/22C09J7/30
CPCC09J133/08G02F2202/28H01L51/5281C09J2433/00C09J2201/128H01L27/323G02B5/305C09J2203/318C09J7/0239C08F220/18C09J7/385C09J4/00C09J133/068G02B5/30G02F1/1335H05B33/02H05B33/10C08F220/1806C08F220/1804H10K59/8791C08F220/325B32B37/003B32B37/1284B32B2307/42C09J7/22C09J7/30B32B37/18B32B37/12B32B38/10B32B2457/20Y10T428/1462Y10T428/1476C09J2301/124H10K59/40C08F220/1808C08F220/20C08F220/06C08F220/14G02B5/3033B32B37/26B32B2037/268C09J2433/003H10K50/86
Inventor 水谷昌纪长谷川由纪茂手木佑辅千叶刚
Owner NITTO DENKO CORP
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