Circular polarizing plate

A technology of circular polarizing plates and polarizers, applied in optics, polarizing elements, optical elements, etc., can solve problems such as color perception changes, process simplification, cost competitiveness is not optimal, and affect display quality

Active Publication Date: 2020-02-21
LG CHEM LTD
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  • Summary
  • 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

[0275] Preparation Example 1. Preparation of Polymerizable Liquid Crystal Composition A

[0276] A 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 an 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 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 values ​​for wavelengths of 450nm, 550nm and 650nm measured for the phase difference layer formed by using the normal dispersion polymerizable liquid crystal compound or the polymerizable liquid crystal compound of formula A alone. In-plane phase difference of light. The in-...

preparation example 2

[0302] Preparation Example 2. Preparation of Polymerizable Liquid Crystal Composition B

[0303] 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 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 of wavelengths of 450nm, 550nm and 650nm 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 replacing the hydrogen atom attached to the nitrogen atom of the compound repre...

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 following: the anomalous 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 anomalous dispersion polymerizable liquid crystal compound of formula A, the photoinitiator and the ultraviolet absorber are combined in a solvent (cyclopentanone ) to prepare polymerizable liquid crystal composition C.

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PUM

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Abstract

The present application relates to a circular polarizing plate and use thereof. The present application may provide a circular polarizing plate which is applied to a display device such as an organiclight emitting display device, can appropriately shield harmful ultraviolet ray while minimizing the blocking of light that is in a visible light region and affects image quality, and has an excellentdurability. In addition, the present application may provide a circular polarizing plate which has an excellent compensation characteristic at a viewing angle 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 July 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 polarizing plate mainly including a polarizer and a retardation layer may 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 polarizing plate) are known, and their representative method is adding an ultraviolet absorber or a light stabilizer to a protective film la...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08L33/12C08L25/12C08L25/14C09K19/38H01L51/52
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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