KR101704400B1 - Reactive organic molecular alignment layer, liquid crystal device using the same and method for manufacturing the same - Google Patents

Abstract

상기 화학식 1에서,
a는 반응성 작용기, b는 알킬 사슬 또는 고리화합물, c는 수소결합을 할 수 있는 작용기임.
따라서 본 발명에 따른 반응성 유기분자 배향막은 기존 폴리이미드배향제와 동등한 수직 배향력으로 빛샘(light leakage) 없이 검은(black) 화면을 구현하고, 자외선을 조사하여 낮은 문턱 전압(threshold voltage)으로 선경사각이 형성됨으로써 액정의 고속응답을 확보할 수 있는 효과가 있다.The present invention relates to a TFT array substrate; A color filter substrate; And a liquid crystal layer interposed between the array substrate and the color filter substrate, wherein a liquid crystal alignment layer is formed between at least one substrate of the array substrate or the color filter substrate and the liquid crystal layer, A liquid crystal display device comprising the reactive organic molecules represented by the following formula (1) and a polyimide-based alignment agent.
[Chemical Formula 1]

In Formula 1,
a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.
Therefore, the reactive organic molecular alignment layer according to the present invention can realize a black screen without light leakage with a vertical alignment power equal to that of the conventional polyimide alignment agent, and can emit ultraviolet light and emit ultraviolet light at a low threshold voltage, So that a high-speed response of the liquid crystal can be ensured.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactive organic molecular alignment film, a liquid crystal display device using the reactive organic molecule alignment film, and a method of manufacturing the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a reactive organic molecular alignment film, a liquid crystal display device using the same, and more particularly, to a reactive organic molecular alignment film used for aligning liquid crystal molecules in the manufacture of a liquid crystal display panel, And a method for producing the same.

2. Description of the Related Art A liquid crystal display (LCD) is composed of a liquid crystal display panel that displays an image using light transmittance of a liquid crystal and a backlight assembly that provides light. The liquid crystal display panel generally includes a TFT array substrate, a color filter layer substrate facing the array substrate, and a liquid crystal layer interposed between the array substrate and the color filter layer substrate. When an electric field is applied to the liquid crystal layer, the arrangement of the liquid crystal molecules changes according to an electric field formed thereby, and a phase difference of incident light passing through the liquid crystal layer is generated, and light is transmitted to display an image.

In general, an alignment film polymer layer is used to form an initial alignment of liquid crystal molecules in a state where a voltage is not supplied to a display device. Generally, polyimide-based polymers are mainly used, and the polymer solution is printed on the array and the color filter layer substrate in the form of a thin film before the injection of the liquid crystal, followed by heat treatment and firing.

However, since the liquid crystal display device using the conventional alignment layer can not form a separate pre-scan square for controlling the director of the liquid crystal, there is a limitation in realizing high-speed response characteristics.

Korean Patent No. 10-0484851 Korean Patent No. 10-0782436 Korean Patent No. 10-1046926

In order to solve the above-mentioned problems, the present invention provides a low-cost, high-response liquid crystal display device having better response characteristics and liquid crystal alignment control power than conventional alignment layers using reactive organic molecules. Also provided is a reactive organic molecular alignment film which uniformly arranges liquid crystal molecules of the liquid crystal layer.

The present invention relates to a TFT array substrate, A color filter substrate; And a liquid crystal layer interposed between the array substrate and the color filter substrate, wherein a liquid crystal alignment layer is formed between at least one substrate of the array substrate or the color filter substrate and the liquid crystal layer, A liquid crystal display device comprising the reactive organic molecules represented by the following formula (1) and a polyimide-based alignment agent.

[Chemical Formula 1]

In Formula 1, a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.

At this time, the reactive organic molecules of the liquid crystal alignment layer are bonded to the polyimide-based alignment agent by non-covalent bonding, and more specifically, they are bonded by hydrogen bonding to vertically align the liquid crystal molecules.

In the above formula (1), a may be photo-reacted by ultraviolet light to form a pretilt angle for controlling the director of liquid crystal molecules in the liquid crystal layer, b can stabilize the liquid crystal alignment, c is a polyimide alignment agent and hydrogen And the reactive organic molecules can be fixed to the polyimide-based alignment agent by forming a bond.

The present invention also provides a TFT array substrate comprising: a TFT array substrate; A color filter substrate; And a liquid crystal layer interposed between the array substrate and the color filter substrate, wherein the liquid crystal layer includes a liquid crystal and a liquid crystal alignment layer, and the liquid crystal alignment layer is a reactive organic And the reactive organic molecules of the liquid crystal alignment layer are bonded to the substrate.

[Chemical Formula 1]

In Formula 1, a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.

At this time, the reactive organic molecules are bonded to an adjacent substrate by hydrogen bonding, and the liquid crystal molecules can be vertically aligned.

In the above formula (1), a may be photo-reacted by ultraviolet rays to form a pre-scan square for director control of the liquid crystal molecules of the liquid crystal layer, b can stabilize the liquid crystal alignment, c is an ITO transparent electrode By forming a hydrogen bond with the glass, the reactive organic molecules can be fixed to the substrate.

(여기서 z=0~16) 또는

이고(여기서 x=0~4, y=0~4), c는 하이드록시기, 아민기, 피리딘기 및 카르복시산기로 이루어진 군에서 선택될 수 있다. In Formula 1, a is selected from the group consisting of an acrylate group and a methacrylate group, and b is

(Where z = 0 to 16) or

(Where x = 0 to 4, y = 0 to 4), and c may be selected from the group consisting of a hydroxyl group, an amine group, a pyridine group, and a carboxylic acid group.

More specifically, the reactive organic molecule is selected from the group consisting of 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy) (Methoxy) benzoic acid, 2-hydroxyethyl methacrylate, 4-methacryloyloxybenzoic acid and 4- (6- (methacryloyloxy) hexyloxy) benzenecarboxylic acid. And at least one selected from the group.

The present invention relates to a TFT array substrate, A color filter substrate; And a liquid crystal layer between the array substrate and the color filter substrate, wherein the reactive organic molecules represented by the following formula (1) are mixed with a liquid crystal aligning agent to prepare a reactive organic molecule-liquid crystal aligning agent mixture (Step 1); Spin coating the reactive organic molecule-liquid crystal aligning agent mixture on one surface of the substrate of the array substrate or the color filter substrate (Step 2); Coalescing the two substrates so that the spin-coated surface is positioned between the two substrates (step 3); Injecting a liquid crystal onto the bonded substrate (step 4); And a step of heat-treating the substrate into which the liquid crystal is injected and cooling the substrate to room temperature (step 5).

[Chemical Formula 1]

In Formula 1, a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.

Here, the liquid crystal aligning agent is a polyimide-based alignment agent, and the reactive organic molecules are bonded to the polyimide-based alignment agent by hydrogen bonding, and the liquid crystal molecules can be vertically aligned.

The reactive organic molecules may be mixed in an amount of 0.01 to 30 parts by weight, preferably 10 to 20 parts by weight, based on 100 parts by weight of the alignment agent. When mixed in the range of 0.01 to 30 parts by weight, a uniform liquid crystal alignment layer is formed to provide an excellent black screen display capability and excellent fastness squareness, thereby achieving high-speed response characteristics.

Further, the step of irradiating UV after the cooling step (step 6) may be further included. By irradiating UV light, the reactive organic molecules are bonded to each other to form a square of liquid crystal molecules.

The present invention also provides a TFT array substrate comprising: a TFT array substrate; A color filter substrate; And a liquid crystal layer between the array substrate and the color filter substrate, the method comprising the steps of: preparing a reactive organic molecule-liquid crystal mixture by mixing reactive organic molecules represented by the following formula (1) One); Dropping the reactive organic molecule-liquid crystal mixture on one side of at least one of the array substrate or the color filter substrate (step 2); Laminating the two substrates so that the reactive organic molecule-liquid crystal mixture is positioned between the two substrates (step 3); And a step of heat-treating the bonded substrate and cooling the substrate to a normal temperature (step 4).

[Chemical Formula 1]

In Formula 1, a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.

At this time, the reactive organic molecules are bonded to an adjacent substrate by hydrogen bonding, and the liquid crystal molecules can be vertically aligned.

The reactive organic molecules may be mixed in an amount of 0.01 to 15 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the liquid crystal. When mixed in the range of 0.01 to 15 parts by weight, a uniform liquid crystal alignment layer is formed to provide an excellent black screen display capability and excellent fastness squareness, thereby achieving high-speed response characteristics.

(여기서 z=0~16) 또는

이고(여기서 x=0~4, y=0~4), c는 하이드록시기, 아민기, 피리딘기 및 카르복시산기로 이루어진 군에서 선택될 수 있다. In Formula 1, a is selected from the group consisting of an acrylate group and a methacrylate group, and b is

(Where z = 0 to 16) or

(Where x = 0 to 4, y = 0 to 4), and c may be selected from the group consisting of a hydroxyl group, an amine group, a pyridine group, and a carboxylic acid group.

More specifically, the reactive organic molecule is selected from the group consisting of 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy) (Methoxy) benzoic acid, 2-hydroxyethyl methacrylate, 4-methacryloyloxybenzoic acid and 4- (6- (methacryloyloxy) hexyloxy) benzenecarboxylic acid. And at least one selected from the group.

The heat treatment may be performed at a temperature of 80 to 120 DEG C for 30 to 120 minutes.

The present invention relates to a reactive organic molecular alignment film used in a liquid crystal display device, wherein the alignment film comprises reactive organic molecules represented by the following formula (1) and a polyimide-based alignment agent, Wherein the organic compound is combined with a reactive organic molecular alignment layer.

[Chemical Formula 1]

In Formula 1, a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.

At this time, the reactive organic molecules are bonded to the polyimide-based alignment agent by hydrogen bonding, and the liquid crystal molecules can be vertically aligned.

(여기서 z=0~16) 또는

이고(여기서 x=0~4, y=0~4), c는 하이드록시기, 아민기, 피리딘기 및 카르복시산기로 이루어진 군에서 선택될 수 있다. In Formula 1, a is selected from the group consisting of an acrylate group and a methacrylate group, and b is

(Where z = 0 to 16) or

(Where x = 0 to 4, y = 0 to 4), and c may be selected from the group consisting of a hydroxyl group, an amine group, a pyridine group, and a carboxylic acid group.

More specifically, the reactive organic molecule is selected from the group consisting of 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy) (Methoxyethyl) oxy) benzoic acid, 2-hydroxyethyl methacrylate, 4-methacryloyloxybenzoic acid and 4 - ([6- (methacryloyloxy) hexyl] oxy) benzenecarboxylic acid And may include one or more selected.

The present invention also provides a reactive organic molecule liquid crystal alignment layer for use in a liquid crystal display device, wherein the liquid crystal alignment layer comprises reactive organic molecules represented by the following formula (1), wherein the reactive organic molecules are bonded to an adjacent substrate And a reactive organic molecular liquid crystal alignment layer.

[Chemical Formula 1]

In Formula 1, a is a reactive functional group, b is an alkyl chain or a cyclic compound, and c is a functional group capable of hydrogen bonding.

At this time, the reactive organic molecules are bonded to an adjacent substrate by hydrogen bonding, and the liquid crystal molecules can be vertically aligned.

(여기서 z=0~16) 또는

이고(여기서 x=0~4, y=0~4), c는 하이드록시기, 아민기, 피리딘기 및 카르복시산기로 이루어진 군에서 선택될 수 있다. In Formula 1, a is selected from the group consisting of an acrylate group and a methacrylate group, and b is

(Where z = 0 to 16) or

(Where x = 0 to 4, y = 0 to 4), and c may be selected from the group consisting of a hydroxyl group, an amine group, a pyridine group, and a carboxylic acid group.

More specifically, the reactive organic molecule is selected from the group consisting of 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy) (Methoxyethyl) oxy) benzoic acid, 2-hydroxyethyl methacrylate, 4-methacryloyloxybenzoic acid and 4 - ([6- (methacryloyloxy) hexyl] oxy) benzenecarboxylic acid And may include one or more selected.

According to the present invention, a black screen is realized without light leakage at a vertical orientation power equivalent to that of existing polyimide aligning agents, and a square screen is formed at a low threshold voltage by irradiating ultraviolet rays, It is possible to secure a response.

1 is a schematic view of a liquid crystal display according to an embodiment of the present invention.
2 is an image showing the black screen of the liquid crystal display device (Example 1 and Comparative Example) in which no voltage is applied in a state that the backlight is turned on.
3 is a graph showing a transmittance curve according to the voltage of the liquid crystal display element before and after the ultraviolet ray irradiation in Example 1. Fig.

Hereinafter, the present invention will be described in detail by way of examples. The objects, features and advantages of the present invention will be readily understood through the following drawings and examples. The present invention is not limited to the drawings and embodiments described herein, but may be embodied in other forms. The drawings and embodiments are provided so that those skilled in the art can fully understand the spirit of the present invention. therefore. The scope of the present invention should not be limited by the following drawings and examples.

The liquid crystal display 100 of the present invention will be described with reference to FIG. The liquid crystal display element 100 includes a liquid crystal layer between the color filter substrate 110 and the TFT array substrate 120. A reactive organic molecule alignment layer made of reactive organic molecules 140 is formed between the liquid crystal layer 130 of the liquid crystal display element 100 and the substrates 110 and 120. The reactive organic molecule 140 has a reactive functional group 143 that interacts with the liquid crystal 130 of the liquid crystal layer at one end and a functional group 141 that can form a hydrogen bond with the substrate at the other end, And an alkyl chain 142 which imparts stability of liquid crystal alignment is bonded to the portion. The reactive functional groups 143 of the reactive organic molecules 140 are optically reacted by ultraviolet rays to form a preliminary square for controlling the liquid crystal molecules of the liquid crystal layer, An ITO electrode or a polyimide-based alignment agent, thereby fixing the reactive organic molecules to the substrate, and the alkyl chain 142 stabilizes the liquid crystal alignment.

< Example  1> Liquid Crystal Display Device Manufacturing 1

5 g of polyimide was dissolved in 100 mL of a mixed solution of N-methyl-2-pyrrolidone and gamma-butyrolactone in a polyimide solution. A reactive organic molecule, 2-carboxyethyl acrylate, was added to the polyimide-based alignment agent. Here, the reactive organic molecules were added in an amount of 15 parts by weight based on 100 parts by weight of the alignment agent. Then, the mixture was stirred at a temperature of 30 ° C for about 10 minutes to allow the reactive organic molecules to completely dissolve and mix in the host alignment layer, thereby preparing a reactive organic molecule-liquid crystal aligning agent mixture.

Next, the reactive organic molecule-liquid crystal aligning agent mixture is spin-coated on a lower TFT array substrate having a pixel electrode (ITO) or an upper color filter substrate having a common electrode (common ITO), and then the two substrates are sealed with a sealant Respectively. After bonding, the liquid crystal was vacuum-injected, and then the liquid crystal display cell was heat-treated in a high-temperature oven at 100 ° C for about 1 hour and then cooled to room temperature to prepare a liquid crystal display device.

< Example  2> Liquid Crystal Display Device Manufacturing 2

One part by weight of reactive organic molecules was added to 100 parts by weight of a host liquid crystal having a dielectric anisotropy (??) Of 3.3 (having a refractive index anisotropy (? N) of 0.101 and a phase transition temperature Tni of 75 degrees) And the reactive organic molecules were completely dissolved and mixed in the host liquid crystal by stirring to prepare a reactive organic molecule liquid crystal mixture.

Next, the reactive organic molecule-liquid crystal mixture was evenly dropped on a lower TFT array substrate having a pixel electrode (ITO) or an upper color filter substrate having a common electrode (common ITO), and the two substrates were bonded together using a sealant Respectively. After the cementation, the liquid crystal display cell was heat-treated in a high-temperature oven at a temperature of 100 ° C for about 1 hour and then cooled to room temperature to prepare a liquid crystal display device. At this time, a liquid crystal alignment layer was formed in which the reactive organic molecules were not covalently bonded to the substrate and simultaneously the liquid crystal molecules were vertically oriented by the organic molecules.

< Comparative Example >

A lower TFT array substrate having a pixel electrode (ITO) or an upper color filter substrate having a common electrode (common ITO) was coated with 5 g of polyimide with N-methyl-2-pyrrolidone and gamma A conventional polyimide-based aligning agent was applied using a polyimide solution dissolved in 100 mL of a mixed solution of gamma-butyrolactone, and the two substrates were cemented together using a sealant. After bonding, the liquid crystal was vacuum-injected, and then the liquid crystal display cell was heat-treated in a high-temperature oven at 100 ° C for about 1 hour and then cooled to room temperature to prepare a liquid crystal display device.

< Experimental Example >

The alignment properties and electro-optical properties of the liquid crystal display device prepared in Example 1 were measured. As a result of comparing the degree of black display on the OV where the voltage was not applied to the liquid crystal device, the liquid crystal display cell according to Example 1 implemented a black screen without light leakage throughout the screen (See Fig. 2). The liquid crystal display cell according to Example 1 was found to have the same vertical aligning power as that of the liquid crystal display cell (Comparative Example) to which the conventional polyimide alignment film was applied, as a result of confirming the alignment state of the liquid crystal through a polarizing microscope (BXP 51, Olympus) Respectively.

In addition, electro-optical characteristics (electro-optical characteristics) with a 632-nm He-Ne laser (JDSU, 1135P), a photodetector (EOT, ET-2000), an oscilloscope (Tektronix, TBS1062) and a function generator (Agilent, 33210A) measurement system was used to measure the voltage-transmittance curve according to the voltage, and the results are shown in FIG. The liquid crystal display cell manufactured in Example 1 exhibited a lower threshold voltage characteristic after irradiation than before the ultraviolet ray irradiation, and thus the pretilt angle was formed for a high-speed response.

100: liquid crystal display element
110: color filter substrate 111: substrate
112: color filter 113: common electrode
120: TFT array substrate 121: substrate
122: insulating film 123: pixel electrode
124: data line 130: liquid crystal
140: reactive organic molecule 141: functional group capable of hydrogen bonding
142: alkyl chain 143: reactive functional group
150: shot 160: encapsulant

Claims (17)

A TFT array substrate;
A color filter substrate; And
And a liquid crystal layer interposed between the array substrate and the color filter substrate,
A liquid crystal alignment layer is formed between the liquid crystal layer and at least one of the array substrate and the color filter substrate,
Wherein the liquid crystal alignment layer comprises a reactive organic molecule represented by the following Formula 1 and a polyimide-based alignment agent,
Wherein the polyimide-based alignment agent and the reactive organic molecule are bonded by a hydrogen bond,
The reactive organic molecules vertically align the liquid crystal molecules,
Wherein the reactive organic molecule comprises a reactive functional group that is optically reacted by ultraviolet rays to form a square of the liquid crystal.
[Chemical Formula 1]

In Formula 1,
a is a reactive functional group containing a double bond at the terminal, b is an alkyl chain or a cyclic compound, and c is a carboxylic acid group. A TFT array substrate;
A color filter substrate; And
And a liquid crystal layer interposed between the array substrate and the color filter substrate,
Wherein the liquid crystal layer comprises a liquid crystal and a liquid crystal alignment layer,
Wherein the liquid crystal alignment layer comprises a reactive organic molecule represented by the following formula (1)
The reactive organic molecules of the liquid crystal alignment layer are bonded to the substrate by hydrogen bonding,
The substrate is an ITO substrate or a glass substrate,
The reactive organic molecules vertically align the liquid crystal molecules,
Wherein the reactive organic molecule comprises a reactive functional group that is photoreactive with ultraviolet light to form a square of the liquid crystal Liquid crystal display element.
[Chemical Formula 1]

a is a reactive functional group containing a double bond at the terminal, b is an alkyl chain or a cyclic compound, and c is a carboxylic acid group. The method according to claim 1 or 2,
In Formula 1,
a is selected from the group consisting of an acrylate group and a methacrylate group,
b is

(Where z = 0 to 16) or

(Where x = 0 to 4 and y = 0 to 4). The method according to claim 1 or 2,
The reactive organic molecule may be selected from the group consisting of 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy)) butoxy] carbonyl} oxy benzoate acid, 4-methacryloyloxybenzoic acid, - ([6- (methacryloyloxy) hexyl] oxy) benzenecarboxylic acid. A TFT array substrate;
A color filter substrate; And
And a liquid crystal layer between the array substrate and the color filter substrate,
A step of mixing a reactive organic molecule represented by the following formula (1) with a polyimide-based alignment agent to prepare a reactive organic molecule-liquid crystal aligning agent mixture (step 1);
Spin coating the reactive organic molecule-liquid crystal aligning agent mixture on one surface of the substrate of the array substrate or the color filter substrate (Step 2);
Coalescing the two substrates so that the spin-coated surface is positioned between the two substrates (step 3);
Injecting a liquid crystal onto the bonded substrate (step 4); And
Treating the substrate with the liquid crystal at a temperature of 80 to 120 ° C for 30 to 120 minutes and cooling to room temperature to form a hydrogen bond between the reactive organic molecule and the polyimide represented by the following formula (1) (step 5)
The reactive organic molecules vertically align the liquid crystal molecules,
Wherein the reactive organic molecule comprises a reactive functional group that is optically reacted by ultraviolet rays to form a square of the liquid crystal.
[Chemical Formula 1]

In Formula 1,
a is a reactive functional group containing a double bond at the terminal, b is an alkyl chain or a cyclic compound, and c is a carboxylic acid group. A TFT array substrate;
A color filter substrate; And
And a liquid crystal layer between the array substrate and the color filter substrate,
Preparing a reactive organic molecule-liquid crystal mixture by mixing a reactive organic molecule represented by the following formula (1) and a liquid crystal (step 1);
Dropping the reactive organic molecule-liquid crystal mixture on one side of at least one of the array substrate or the color filter substrate (step 2);
Laminating the two substrates so that the reactive organic molecule-liquid crystal mixture is positioned between the two substrates (step 3); And
Heat-treating the bonded substrate at a temperature of 80 to 120 ° C for 30 to 120 minutes, and cooling the coated substrate to a room temperature to thereby form a hydrogen bond between the reactive organic molecules represented by the following formula (1) and the substrate (step 4)
The substrate is an ITO substrate or a glass substrate,
The reactive organic molecules vertically align the liquid crystal molecules,
Wherein the reactive organic molecule comprises a reactive functional group that is optically reacted by ultraviolet rays to form a square of the liquid crystal.
[Chemical Formula 1]

In Formula 1,
a is a reactive functional group containing a double bond at the terminal, b is an alkyl chain or a cyclic compound, and c is a carboxylic acid group. The method according to claim 5 or 6,
In Formula 1,
a is selected from the group consisting of an acrylate group and a methacrylate group,
b is

(Where z = 0 to 16) or

(Where x = 0 to 4 and y = 0 to 4). The method of claim 5,
Wherein the reactive organic molecules are mixed in an amount of 0.01 to 30 parts by weight based on 100 parts by weight of the alignment agent. The method of claim 5,
Further comprising the step of irradiating UV light after the cooling step (step 6). The method of claim 6,
Wherein the reactive organic molecules are mixed at 0.01 to 15 parts by weight per 100 parts by weight of the liquid crystal. delete As a reactive organic molecular alignment film used in a liquid crystal display device,
Wherein the alignment layer comprises a reactive organic molecule represented by the following Formula 1 and a polyimide-based alignment agent,
Wherein the reactive organic molecules are bonded to the polyimide-based alignment agent by hydrogen bonding,
The reactive organic molecules vertically align the liquid crystal molecules,
Wherein the reactive organic molecule comprises a reactive functional group that is photoreactive with ultraviolet light to form a square of the liquid crystal.
[Chemical Formula 1]

In Formula 1,
a is a reactive functional group containing a double bond at the terminal, b is an alkyl chain or a cyclic compound, and c is a carboxylic acid group. The method of claim 12,
In Formula 1,
a is selected from the group consisting of an acrylate group and a methacrylate group,
b is

(Where z = 0 to 16) or

(Where x = 0 to 4 and y = 0 to 4). The method of claim 12,
The reactive organic molecule may be selected from the group consisting of 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy)) butoxy] carbonyl} oxy benzoate acid, 4-methacryloyloxybenzoic acid, - ([6- (methacryloyloxy) hexyl] oxy) benzenecarboxylic acid. &Lt; / RTI &gt; As a reactive organic molecule liquid crystal alignment layer used in a liquid crystal display element,
Wherein the liquid crystal alignment layer comprises a reactive organic molecule represented by the following formula (1)
The reactive organic molecules are bonded to the substrate by hydrogen bonding,
The substrate is an ITO substrate or a glass substrate,
The reactive organic molecules vertically align the liquid crystal molecules,
Wherein the reactive organic molecule comprises a reactive functional group that is photoreactive with ultraviolet light to form a square of the liquid crystal.
[Chemical Formula 1]

In Formula 1,
a is a reactive functional group containing a double bond at the terminal, b is an alkyl chain or a cyclic compound, and c is a carboxylic acid group. 16. The method of claim 15,
In Formula 1,
a is selected from the group consisting of an acrylate group and a methacrylate group,
b is

(Where z = 0 to 16) or

(Where x = 0 to 4, and y = 0 to 4). 16. The method of claim 15,
The reactive organic molecule may be selected from the group consisting of 2-carboxyethyl acrylate, 4 - ({[4- (acryloyloxy)) butoxy] carbonyl} oxy benzoate acid, 4-methacryloyloxybenzoic acid, - ([6- (methacryloyloxy) hexyl] oxy) benzenecarboxylic acid. &Lt; / RTI &gt;

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