Circular polarizer

A circular polarizing plate and retardation layer technology, applied in optics, optical components, instruments, etc., can solve problems such as process simplification and cost competitiveness, affecting the overall durability of circular polarizing plates, and affecting display quality, etc., to achieve excellent Durability, ensuring cost competitiveness, and ensuring the effect of process simplification

Active Publication Date: 2022-07-05
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the wavelength range blocked by UV absorbers or photostabilizers is not precisely adjusted, light in the short-wavelength visible region may be blocked by circular polarizers, which may affect display quality, such as causing changes in color perception
In addition, when an ultraviolet absorber or a light stabilizer is contained in a layer formed of a liquid crystal compound, the related components may adversely affect the overall durability of the circular polarizing plate
[0008] In addition, in order to improve the compensation characteristics of the circular polarizing plate under the viewing angle, a retardation film having a retardation value in the thickness direction can be laminated on the circular polarizing plate by a pressure-sensitive adhesive or an adhesive, but such a technology is difficult to process. Less preferred in terms of simplicity and cost competitiveness

Method used

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Examples

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preparation example 1

[0276] Preparation Example 1. Preparation of Polymerizable Liquid Crystal Composition A

[0277] The polymerizable liquid crystal composition was prepared using LC1057 liquid crystal of BASF Corporation as a normal dispersion polymerizable liquid crystal compound and a liquid crystal compound of the following formula A as anomalous dispersion liquid crystal compound. The normal dispersion polymerizable liquid crystal compound has R(450) / R(550) at a level of about 1.09 to 1.11 and R(650) / R(550) at a level of about 0.93 to 0.95, and the liquid crystal compound of Formula A has a R(450) / R(550) is at a level around 0.84 to 0.86 and R(650) / R(550) is at a level around 1.01 to 1.03. R(450), R(550), and R(650) are the wavelengths of 450 nm, 550 nm, and 650 nm, respectively, measured for the retardation layer formed by using the normal dispersion polymerizable liquid crystal compound or the polymerizable liquid crystal compound of Formula A alone. The in-plane phase difference of ligh...

preparation example 2

[0303]Preparation Example 2. Preparation of Polymerizable Liquid Crystal Composition B A polymerizable liquid crystal composition B was prepared in the same manner as in Preparation Example 1, except that the liquid crystal compound of the following formula B was used as the anomalous dispersion polymerizable liquid crystal compound. The liquid crystal compound of Formula B has R(450) / R(550) at a level of about 0.81 to 0.83, and R(650) / R(550) at a level of about 1.01 to 1.03. R(450), R(550) and R(650) are in-plane retardation to light having wavelengths of 450 nm, 550 nm and 650 nm measured for the retardation layer formed by using the polymerizable liquid crystal compound of Formula B alone.

[0304] [Formula B]

[0305]

[0306] Here, the compound of formula B was obtained by obtaining a compound represented by the following formula A9 in the same manner as in Preparation Example 1, and then using 2-[2- (methoxyethoxy)]ethyl substituted. The NMR confirmation result of t...

preparation example 3

[0309] Preparation Example 3. Preparation of Polymerizable Liquid Crystal Composition C

[0310] A polymerizable liquid crystal composition was prepared by applying the anomalous dispersion polymerizable liquid crystal compound of formula A in the above Preparation Example 1, the same photoinitiator as used in Preparation Example 1, and the maximum absorption wavelength range as an ultraviolet absorber UV absorber (Orient Chemical Industries, BONASORB UA-3912) at about 380 nm to 390 nm. The anomalous dispersion polymerizable liquid crystal compound of formula A, a photoinitiator and an ultraviolet absorber were combined in a solvent (cyclopentanone) in a weight ratio of 20:1:1 (anomaly dispersion polymerizable liquid crystal compound:photoinitiator:ultraviolet absorber). ) to prepare polymerizable liquid crystal composition C.

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Abstract

This application relates to circular polarizers and their uses. The present application can provide a circular polarizing plate, which can be applied to a display device such as an organic light emitting display device, to minimize blocking of light in the visible region affecting image quality while appropriately blocking harmful ultraviolet rays, and also has excellent durability. In addition, the present application can provide a circular polarizing plate having excellent compensation characteristics at viewing angles while ensuring process simplification and cost competitiveness.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2017-0087123 filed on Jul. 10, 2017, the disclosure of which is incorporated herein by reference in its entirety. [0002] This application relates to circular polarizers. Background technique [0003] A so-called circular polarizer, which mainly includes a polarizer and a retardation layer, can be used to prevent reflection of external light caused by a reflective electrode in an organic light emitting device. For example, Patent Document 1 (Japanese Unexamined Patent Publication No. H8-321381 ) discloses a method of arranging a circular polarizing plate toward a transparent electrode in an organic light emitting device. [0004] Techniques for imparting an ultraviolet blocking function to an optical film such as a circular polarizer are known, and a representative method of them is that of adding an ultraviolet absorber or a light stabilizer to a protective fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/04
CPCC08L25/12C09D125/12C09D133/12C09D137/00C08F224/00G02B5/3016G02B5/3083G02B5/208C09K2019/0448C09K19/3497H10K59/8791C08L33/12G02B5/305C08L25/14C09K19/38C09K19/3809H10K50/868H10K59/50
Inventor 尹赫李南贞朴锺声朴文洙郑在祜朴志成文炳竣
Owner LG CHEM LTD
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