Polarizing plate

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...

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

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