Polarizing plate

A polarizer and polarizer technology, applied in optics, optical components, polarizing components, etc., can solve problems such as reduced blocking efficiency, impact on the durability of the liquid crystal layer, and reduced orientation of liquid crystal compounds

Active Publication Date: 2021-03-30
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commercially available UV absorbers or photostabilizers are effective at blocking UV wavelengths less than about 380 nm, but have reduced blocking efficiency for UV wavelengths of 380 nm or greater
In addition, although ultraviolet absorbers or photostabilizers capable of partially blocking or absorbing ultraviolet rays of 380 nm or more are known, such ultraviolet absorbers or photostabilizers also absorb or block short wavelengths belonging to the visible region, and thus also absorb or block part of the visible light region displayed in a display device, thereby adversely affecting image quality such as color perception
[0005] On the other hand, since UV absorbers or light stabilizers are additives, there may be problems when blending them into optical films
For example, when a polymerizable liquid crystal compound is polymerized in an aligned state to produce a retardation layer, an ultraviolet absorber or a photostabilizer is blended in the relevant layer, whereby the orientation of the liquid crystal compound may decrease
In addition, since most polymerizable liquid crystal compounds are ultraviolet-polymerizable, which are irradiated with ultraviolet rays during the manufacturing process of the retardation layer, if there is an ultraviolet absorber or light stabilizer in the retardation layer, polymerization may not proceed properly, thereby Adversely affects the durability of the liquid crystal layer itself

Method used

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Examples

Experimental program
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preparation example 1

[0200] Preparation Example 1. Preparation of Polymerizable Liquid Crystal Composition A

[0201]A polymerizable liquid crystal composition was prepared using LC1057 liquid crystal of BASF Corporation as a forward dispersion polymerizable liquid crystal compound and a liquid crystal compound of the following formula A as a reverse dispersion liquid crystal compound. The R(450) / R(550) of the forward dispersion polymerizable liquid crystal compound is at a level of about 1.09 to 1.11 and the R(650) / R(550) is at a level of about 0.93 to 0.95, and the liquid crystal compound of formula A The R(450) / R(550) is at a level of about 0.84 to 0.86 and the R(650) / R(550) is at a level of about 1.01 to 1.03. R(450), R(550) and R(650) are measured with respect to a retardation layer formed by using a forward dispersion polymerizable liquid crystal compound or a polymerizable liquid crystal compound of formula A alone at wavelengths of 450 nm, 550 nm and 650 nm, respectively. The in-plane ret...

preparation example 2

[0227] Preparation Example 2. Preparation of Polymerizable Liquid Crystal Composition B

[0228] A polymerizable liquid crystal composition B was prepared in the same manner as in Preparation Example 1, except that a liquid crystal compound of the following formula B was used as the reverse 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 retardations to light of wavelengths of 450 nm, 550 nm, and 650 nm measured relative to a retardation layer formed by using the polymerizable liquid crystal compound of Formula B alone.

[0229] [Formula B]

[0230]

[0231] 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 replacing the hydrogen atom bonded to the nitrogen atom of the compou...

preparation example 3

[0234] Preparation Example 3. Preparation of Polymerizable Liquid Crystal Composition C

[0235] A polymerizable liquid crystal composition is prepared by applying the reverse dispersion polymerizable liquid crystal compound of the 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 reverse dispersion polymerizable liquid crystal compound of formula A, the photoinitiator and the ultraviolet absorber are combined in a solvent (ring Pentanone), to prepare polymerizable liquid crystal composition C.

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Abstract

The present application relates to a polarizing plate and a display comprising the same. The present application may provide a polarizing plate including a retardation layer exhibiting an ultravioletblocking property even in a state where no ultraviolet absorber or light stabilizer is blended therein. In addition, the present application may provide a polarizing plate which: exhibits a constant ultraviolet blocking property even in the absence of a ultraviolet absorber or light stabilizer and thus can selectively block ultraviolet rays in an area that needs to be blocked, by the polarizing plate alone or in combination with an appropriate ultraviolet screening agent or light stabilizer as necessary, without affecting display performance of a display device, such as color and image quality; and requires no separate ultraviolet blocking layer and thus not only can be formed thin but also has an excellent durability.

Description

technical field [0001] This application claims priority based on Korean Patent Application No. 10-2018-0133684 filed on November 2, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0002] The present application relates to a polarizing plate and a display device. Background technique [0003] In many cases, an optical film included in a display device requires ultraviolet blocking properties for durability of the optical film itself or protection of a display element or the like. For this reason, ultraviolet absorbers or photostabilizers are incorporated into many optical films. [0004] Commercially available ultraviolet absorbers or photostabilizers can effectively block ultraviolet rays having a wavelength of less than about 380 nm, but the blocking efficiency is reduced for ultraviolet rays of 380 nm or greater. In addition, although ultraviolet absorbers or photostabilizers capable of partially blocking or absorbing ultraviolet rays...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/04
CPCG02B1/04G02B5/3083G02B5/3016G02B5/3008G02B5/305C09K2019/0448C09K19/3497G02F1/133528G02F1/13363C08L101/12G02B5/3025C08F222/24C09K19/3861G02F1/13452G02F1/1345C09K2323/035
Inventor 尹赫张俊元郑棕炫金善国朴文洙
Owner LG CHEM LTD
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