Circular polarizer and preparation method thereof

Abstract

The invention discloses a circular polarizer and a preparation method thereof. In the invention, the surface of a base material is coated with a first orientation layer and a second orientation layer respectively; a phase difference layer is formed on the surface of the second orientation layer; the surface of the first orientation layer is coated with a polarization layer mixture; the polarization layer mixture comprises multiple polymerizable liquid crystal monomers, a dichroic pigment and an ultraviolet absorber; under ultraviolet irradiation, the polymerizable liquid crystal monomers with more polymerizable groups on the side close to the ultraviolet light source are enriched, and the polymerizable liquid crystal monomers with fewer polymerizable groups on the side far from the ultraviolet light source are enriched; the polymerizable liquid crystal monomers with more polymerizable groups are in a nematic phase, the viscosity of the nematic phase is relatively low, and a continuous and perfect cured film is formed; the polymerizable liquid crystal monomers with fewer polymerizable groups are in a smectic phase, and the smectic phase is an ideal two-dimensional ordered structure and realizes a polarization effect to form a polarization layer; and the circular polarizer has a thinning property and a good flexural property as well as a good anti-reflection property in the whole visible light range.

Description

technical field [0001] The invention relates to the display field, in particular to a circular polarizer and a preparation method thereof. Background technique [0002] Organic electroluminescent display technology has the advantages of self-illumination, wide viewing angle, almost infinitely high contrast ratio, low power consumption, high response speed and flexibility, etc., and is considered to be the next-generation mainstream display technology to replace liquid crystal display technology. However, the currently used organic electroluminescent display has a metal electrode structure, which has reflections under strong indoor or outdoor light, which causes reading interference and causes the dark state to be not dark enough. The general solution is to add a circular polarizer that can resist ambient light reflection on the outside. After the external natural light passes through the circular polarizer, only the circularly polarized light of one direction passes through...

AI Technical Summary

Problems solved by technology

The polarizer prepared by this traditional process is complicated in process, high in cost and thick in thickness, generally between 150 and 250 μm in thickness

If this kind of polarizer is applied to an organic electroluminescent display as a circular polarizer, it is necessary to compound at least one layer of retardation film on the linear polarizer, resulting in thicker thickness, poor flexural performance, and increased corresponding Organic Electroluminescent Display Weight

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