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Optical film, preparation method of the same, and liquid crystal display comprising the same

A technology of optical film and liquid crystal alignment layer, applied in the field of optical film, can solve the problems of durability deterioration, liquid crystal film peeling, electrostatic discharge, etc., and achieve the effect of improving durability and excellent adhesive strength

Active Publication Date: 2010-12-15
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when such an alignment layer is used, the liquid crystal film may peel off from the alignment layer or shrink due to insufficient adhesion between the alignment layer and the liquid crystal film in a hot and humid environment
In addition, when the rubbing method is used to prepare the alignment layer, there are some problems: electrostatic discharge may be caused due to contact with impurities during the rubbing process or defect sites may be caused, and fine dust may be generated by rubbing the fabric
However, the method for preparing the photo-alignment layer has a problem in that the use of commercially available solvents is limited, and a retardation film including the photo-alignment layer prepared by the above method must use acetyl cellulose as a substrate
The problems with this acetyl cellulose substrate are that light leakage may occur in the substrate due to its high hygroscopicity under hot and humid environments, and durability deterioration such as a decrease in the degree of polarization
There is still no report on the application of photo-alignment layers on the substrates of cycloolefin-based stretched films

Method used

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  • Optical film, preparation method of the same, and liquid crystal display comprising the same
  • Optical film, preparation method of the same, and liquid crystal display comprising the same
  • Optical film, preparation method of the same, and liquid crystal display comprising the same

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[0078] In addition, the present invention also provides a method for preparing the above-mentioned optical film, the method comprising the following steps: 1) coating the composition for the liquid crystal alignment layer on a substrate based on a cycloolefin film, and drying to form a coating, Ultraviolet rays are then irradiated to form a liquid crystal alignment layer, the composition comprising: a) a photoreactive polymer selected from a norbornene-based photoreactive polymer containing a cinnamate group, a photoreactive polymer containing a unit represented by Chemical Formula 1 and one or more photoreactive polymers in the photoreactive polymer containing the unit represented by Chemical Formula 2, b) a multifunctional monomer crosslinkable with the photoreactive polymer, c) a photoinitiator , and d) an organic solvent; and 2) coating a liquid crystal compound solution on the liquid crystal alignment layer, drying it, and then irradiating ultraviolet rays thereon, the liq...

Embodiment 1

[0107] As shown in Table 1 below, 5-norbornene-2-methyl-(4-methoxycinnamate) as a photoreactive polymer, pentaerythritol triacrylate as a polyfunctional monomer, and Irgacure 907 (Swiss, Ciba-Geigy) as a photoinitiator was dissolved in cyclopentanone at concentrations of 2 wt%, 2 wt% and 0.5 wt%, respectively. The composition solution for the liquid crystal alignment layer prepared according to the above composition was coated on a cycloolefin-based film (Japan, SEKISUI, KANEKA) to a dry thickness of and dried with hot air in an oven at 70° C. for 2 minutes to form a liquid crystal alignment layer.

[0108] The liquid crystal alignment layer was once cured to provide alignment by using a wire grid polarizing plate (Moxtek) and a high-pressure mercury lamp of 80 w / cm at a rate of 3 m / min by polarizing UV in a direction perpendicular to the substrate.

[0109] Based on 100 parts by weight of the total solution, mixed solids-95 wt% of polymeric liquid crystal compounds (Merck) ...

Embodiment 2

[0115] Instead of having In addition to the polymeric liquid crystal compound (which is composed of cyanobiphenyl-based acrylate, cyanophenylcyclohexane-based cyanophenylcyclohexane-based cyanophenyl acrylate-based acrylate), and the example 1 to prepare a liquid crystal film in the same manner.

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Abstract

The present invention relates to a composition for liquid crystal alignment layer, a preparation method of liquid crystal alignment layer using the same, and an optical film comprising the liquid crystal alignment layer. More particularly, the composition for liquid crystal alignment layer according to the present invention includes crosslinkable functional monomers as well as a photoreactive polymer, thereby improving thermal stability and durability of the liquid crystal alignment layer that is prepared by using the composition for liquid crystal alignment layer. In addition, when the liquid crystal alignment layer is used to produce an optical film, adhesive strength between substrate and liquid crystal alignment layer and between liquid crystal alignment layer and liquid crystal film can be improved.

Description

technical field [0001] The invention relates to an optical film, a preparation method of the optical film and a liquid crystal display comprising the optical film. [0002] This application claims priority to Korean Patent Application No. 10-2008-0005837 filed with the Korean Intellectual Property Office on January 18, 2008, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] In general, optical films such as a retardation film and a viewing angle compensation film are disposed between a polarizing plate and a liquid crystal cell, so that a liquid crystal display (LCD) has a reduced color change and an increased viewing angle to improve brightness. The optical film is mainly classified into two kinds of films: one is a stretched film prepared by stretching a polymer film to obtain optical anisotropy, and the other is a film prepared by coating a plastic substrate with a polymerized liquid crystal compound and passing UV ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08J7/043C08J7/046
CPCG02F1/13363C08J7/04B32B27/08C08J2485/04G02F2001/133635B32B27/32C08J2365/00G02F2001/133638G02F2001/133633B32B7/12B32B27/306B32B2307/308B32B2307/40B32B2307/42B32B2307/554B32B2307/734B32B2457/202Y10T428/31576G02F1/133633G02F1/133635G02F1/133638C08J7/043C08J7/046C08J5/18G02F1/1337G02F1/1335
Inventor 申斗铉全炳建朴文洙全成浩金宪崔大胜柳东雨
Owner LG CHEM LTD
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