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Composite polarizing plate and image display device including the same

A technology of polarizing plates and polarizers, applied in optics, polarizing elements, optical elements, etc., can solve the problems of phase difference layer peeling, failure to propose, and expansion of the adhesive layer, so as to reduce the defect rate, improve the bonding properties, The effect of excellent light leakage properties

Active Publication Date: 2020-11-03
DONGWOO FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, flexible substrates are often bent during use. If the bonding force between the retardation layers is weak, there will be problems such as expansion of the adhesive layer or peeling of the retardation layer.
[0005] For example, Korean Registered Patent No. 1191865 discloses technology related to flexible substrates, but does not propose a solution to the aforementioned problems

Method used

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  • Composite polarizing plate and image display device including the same
  • Composite polarizing plate and image display device including the same
  • Composite polarizing plate and image display device including the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0083] A polyvinyl alcohol film (PS7500, Kuraray Co.) having a thickness of 75 μm, an average degree of polymerization of 2,400, and a degree of saponification of 99.9% or more was immersed in water (deionized water) at 30° C. for 2 minutes to swell . Thereafter, the film was dipped in a staining solution containing 3.5 mmol / L of iodine and 2% by weight of potassium iodide at 30° C. for 4 minutes to be stained. Then, the treated membrane was further immersed in a cross-linking solution containing 2% by weight of potassium iodide, 3.7% by weight of boric acid, and lithium chloride at a molar ratio of 4.5 to 1 mole of potassium iodide at 50° C. for 2 minutes to make it crosslinked. couplet. During each swelling / dyeing / crosslinking / washing process, the polyvinyl alcohol film was stretched to a cumulative stretching ratio of 5.5 times to prepare a polarizer.

preparation example 2

[0085] Noblen FLX80E4 resin (Sumitomo Chemical Co., Ltd.) was placed on both sides of the resin layer (Sumitomo Chemical Co.) of Noblen W151, and a multilayer extrusion molding machine was used for co-extrusion to prepare a three-layer The substrate film of the structure, and then, polyvinyl alcohol powder Z-200 (Japan Synthetic Chemical Co., Ltd.) was heated at 90° C. to prepare a 3% by weight aqueous solution. Afterwards, Sumirejin 650 (Taoka Chemical Co., Ltd.) as a crosslinking agent was mixed in a ratio of 1% by weight to 2% by weight of polyvinyl alcohol powder to obtain a base coat layer. Coating liquid, and polyvinyl alcohol powder PVA 124 (Kuraray Co., Ltd.) was heated at 90°C to obtain an 8% by weight aqueous solution, thus preparing a polyvinyl alcohol resin-forming coating liquid. Next, the above-mentioned multilayer substrate film was subjected to corona treatment, and a primer layer was applied to the corona-treated surface using a microgravure coater, and dried ...

Embodiment 1

[0088] (A) Preparation of photocurable adhesive composition

[0089] By mixing 20% ​​by weight of CEL 2021P (Daicel Company) as an alicyclic epoxy compound, 80% by weight of neopentyl glycol diglycidyl ether (Aldrich Company) as a linear aliphatic epoxy compound, 4% by weight CPI-110A (San-Apro Company) as a cationic photoinitiator to prepare an adhesive composition. In this case, the weight ratio of the cycloaliphatic epoxy compound to the linear aliphatic epoxy compound is 1:4.

[0090] (B) Preparation of composite retardation layer

[0091] The prepared photocurable adhesive composition was bonded between the λ / 2 retardation layer and the λ / 4 retardation layer so as to form a thickness of 3 μm, and a high-pressure mercury lamp (UVA, cumulative light intensity 500 mJ / cm 2 ) for UV curing to prepare a composite retardation layer.

[0092] (C) Preparation of polarizing plate

[0093] A triacetyl cellulose film (Fuji Corporation) was bonded to one side of the polarizer prep...

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Abstract

The present invention provides a complex polarizing plate and an image display device comprising the same. The complex polarizing plate comprises: a polarizer, and complex phase difference layers disposed on at least one surface of the polarizer, and having, from the polarizer, a first phase difference layer, a photocurable adhesive layer, and a second phase difference layer, which are stacked inorder, wherein the complex phase difference layers have -514 to -275 of a slope of stiffness with respect to a temperature in the range of 20 to 90DEG C, thereby improving bending characteristics of adisplay and adhesive characteristics between phase difference layers, enhancing the stiffness of the complex phase difference layers, and improving the bending characteristics so as to exhibit good light leakage characteristics.

Description

technical field [0001] The invention relates to a composite polarizing plate and an image display device comprising the composite polarizing plate. Background technique [0002] Consistent with information display terminal devices such as mobile phones and PDAs, the development trend of information display is developing from centering on high performance and high functionality capable of realistically presenting things toward mobility and convenience. Therefore, there is a great demand for flexible displays that are light in weight and easy to fold without space and shape limitations. [0003] More specifically, a flexible display refers to a display manufactured using a flexible substrate that can be bent or folded, and can be classified into a rugged display, a bendable display, a rollable display, etc., depending on its use and function. (rollable) display. In addition, flexible displays are displays under development that replace existing flat panel displays (FDP) such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C09J163/00C09J7/20
CPCB32B2307/42C09J163/00C09J2203/318C09J7/20G02B5/3033G02B5/3083
Inventor 崔允硕权容铉陆根善赵天熙
Owner DONGWOO FINE CHEM CO LTD
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