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Polarizing plate group and liquid crystal display panel

A polarizing plate and polarizing technology, applied in optics, polarizing elements, optical elements, etc., can solve problems such as liquid crystal display panel warping, liquid crystal display panel cracks, etc.

Active Publication Date: 2022-07-05
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional technology, if a polarizing plate with a thinner polarizer is used, the liquid crystal display panel may be warped due to heating, or as the liquid crystal display panel becomes thinner, the assembly of the liquid crystal display device may be damaged. There may be cracks on the LCD panel during the steps

Method used

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  • Polarizing plate group and liquid crystal display panel
  • Polarizing plate group and liquid crystal display panel
  • Polarizing plate group and liquid crystal display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited by these examples. The measurement method and evaluation method of each characteristic are as follows. In addition, unless otherwise noted, "parts" and "%" in Examples and Comparative Examples are based on weight.

[0077] (1) Thickness

[0078] The measurement was performed using a dial gauge (manufactured by PEACOCK, product name "DG-205", dial gauge holder (product name "pds-2")).

[0079] (2) Warpage of LCD panel due to heating

[0080] The amount of warpage due to heating of the liquid crystal display panels provided with the polarizing plate groups of Examples and Comparative Examples was evaluated according to the following procedure.

[0081] The visible side polarizing plate and the rear side polarizing plate were cut into a size of 245mm×420mm. In addition, the viewing-side polarizing plate is cut so that the absorption axi...

manufacture example 1

[0096] (Production Example 1: Preparation of UV-curable Adhesive)

[0097] 40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloyl line (ACMO), and 3 parts by weight of photoinitiator "IRGACURE819" (manufactured by BASF) were blended to prepare an ultraviolet curable adhesive.

manufacture example 2

[0098] (Production Example 2: Production of Conductive Adhesive Layer A)

[0099] A monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was put into a 4-neck flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube, and a cooler. Next, 0.1 part of 2,2′-azobisisobutyronitrile as a polymerization initiator was put in ethyl acetate with respect to 100 parts of the above-mentioned monomer mixture (solid content), and nitrogen gas was introduced while stirring slowly. After nitrogen substitution, the liquid temperature in the flask was maintained at about 60°C, and the polymerization reaction was performed for 7 hours. Then, ethyl acetate was added to the prepared reaction liquid to adjust the solid content concentration to 30%. In this manner, a solution of the acrylic polymer (A-1) (base polymer) having a weight average molecular weight of 1.4 million was prepared.

[0100] 1.0 part of lithium bis(trifluoromethane...

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Abstract

The present invention provides a polarizing plate assembly, which can suppress the cracks of the liquid crystal display panel and the warpage of the liquid crystal display panel caused by heating. In the polarizing plate group of the present invention, the thickness dpf of the first polarizer and the thickness dpr of the second polarizer are both 7 μm or less, and satisfy 0 μm≦dpf-dpr≦5 μm; The total daf of the thicknesses of all the adhesive layers included in the plate and the total dar of the thicknesses of all the adhesive layers included in the backside polarizing plate satisfy daf≧20μm, dar≧20μm, and dr×0.2<dar<dr ×0.6.

Description

technical field [0001] The present invention relates to a polarizing plate group and a liquid crystal display panel. Background technique [0002] A liquid crystal display device, which is a typical image display device, includes a liquid crystal display panel formed by arranging polarizers on both sides of a liquid crystal cell due to its image forming method. In recent years, in order to meet the needs of thinning liquid crystal display devices, attempts have been made to reduce the thickness of liquid crystal cells, and a technology that can suppress the warping of liquid crystal display panels in a high temperature environment that may occur when thinning liquid crystal cells is proposed (Patent Reference 1). However, in the conventional technology, if a polarizer with a thinner polarizer is used, the liquid crystal display panel may warp due to heating, or the liquid crystal display panel may be thinned, and the liquid crystal display panel may become thinner in the as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/30G02F1/1335G02B5/3041G02B1/14B32B7/023B32B7/12G02F1/133528B32B2457/202
Inventor 三田聪司森拓也泽田浩明猿桥友斗池田哲朗
Owner NITTO DENKO CORP