KR101672403B1 - Liquid crystal alignment layer having photo-luminescence property, liquid crystal device using the same and method for manufacturing thereof - Google Patents
Liquid crystal alignment layer having photo-luminescence property, liquid crystal device using the same and method for manufacturing thereof Download PDFInfo
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- KR101672403B1 KR101672403B1 KR1020150044309A KR20150044309A KR101672403B1 KR 101672403 B1 KR101672403 B1 KR 101672403B1 KR 1020150044309 A KR1020150044309 A KR 1020150044309A KR 20150044309 A KR20150044309 A KR 20150044309A KR 101672403 B1 KR101672403 B1 KR 101672403B1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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Abstract
The present invention relates to a liquid crystal alignment layer having a light emitting property, a liquid crystal display using the same, and a method of manufacturing the same. More particularly, the present invention relates to a liquid crystal alignment device capable of realizing the alignment property of liquid crystal molecules without the conventional polyimide alignment film, A liquid crystal display using the same, and a manufacturing method thereof.
According to the present invention, a liquid crystal alignment layer is realized using organic molecules including a non-covalent bonding unit capable of bonding with a substrate and a rigid ring structure having light emission characteristics, thereby uniformly arranging liquid crystal molecules without a conventional polyimide alignment layer And can simultaneously realize the light emitting property. By implementing the light emitting characteristic, it is possible to realize the color without using the conventional color filter layer, thereby reducing the manufacturing cost of the panel and improving the panel transmittance.
Description
The present invention relates to a liquid crystal alignment layer having a light emitting property, a liquid crystal display using the same, and a method of manufacturing the same. More particularly, the present invention relates to a liquid crystal alignment device capable of realizing the alignment property of liquid crystal molecules without the conventional polyimide alignment film, A liquid crystal display using the same, and a manufacturing method thereof.
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, the conventional alignment film process requires a separate thin film forming step before liquid crystal injection, and the thin film is subjected to a multi-step drying and curing process, which complicates and takes a long time. Also, there is a problem in that the transmittance is reduced as the transmitted light passes through the color filter layer to display a specific color.
In order to solve the above problems, the present invention provides a liquid crystal alignment layer exhibiting light emission characteristics by uniformly arranging liquid crystal molecules of a liquid crystal layer without a conventional polyimide alignment layer. The present invention also provides a low cost liquid crystal display device which realizes excellent display characteristics without the conventional polyimide alignment film and a method of manufacturing the same.
The present invention relates to a liquid crystal alignment layer for use in a liquid crystal display device, which comprises an organic molecule represented by the following general formula (1), wherein the organic molecule is bonded to an adjacent substrate, .
[Chemical Formula 1]
In Formula 1,
a is a functional group capable of noncovalent bonding, and b is a ring structure having a luminescent property.
The organic molecules can orient the liquid crystal vertically or horizontally relative to the substrate.
The organic molecule has a rigid ring structure at one end (part b) interacting with the liquid crystal molecules of the liquid crystal layer to give orientation stability and light emission property, and a non-covalent Bonding units may be combined.
The portion b of the organic molecules interacts with the liquid crystal molecules of the liquid crystal layer to stably align the liquid crystal molecules vertically. The portion a is non-covalently bonded to the ITO transparent electrode or glass of the substrate to fix the organic molecules to the substrate can do
In Formula 1, a may include at least one member selected from the group consisting of a hydroxy group, an amine group, a carboxylic acid group, and a sulfonate group .
In Formula 1, b may include a pyrene structure.
The organic molecule may be selected from the group consisting of 1-aminopyrene, 1-aminomethyl pyrene, 1-pyrenecarboxylic acid, 1-pyrenebutyric acid, acid, 1-pyrenebutanol, 1-pyrenesulfonic acid hydrate, 1-pyrenesulfonic acid sodium salt, and 1, 8-pyrenetetrasulfonic tetrasodium salt hydrate (1,3,6,8-pyrenetetrasulfonic acid tetra acid tetrasodium salt hydrate).
The liquid crystal alignment layer may be self-assembled.
The present invention also provides a TFT array substrate comprising: a TFT array substrate; A common electrode substrate; And a liquid crystal layer interposed between the array substrate and the color substrate, wherein the liquid crystal layer comprises a liquid crystal and a liquid crystal alignment layer, and the liquid crystal alignment layer is a liquid crystal alignment layer comprising the organic molecules represented by Formula 1 And the organic molecules are bonded to an adjacent substrate.
The organic molecules may be bonded to an adjacent substrate by noncovalent bonding. The details of the organic molecule are as described above.
The present invention also relates to a TFT array substrate; A common electrode substrate; And a liquid crystal layer interposed between the array substrate and the common electrode substrate, the method comprising the steps of: preparing an organic molecule-liquid crystal mixture by mixing organic molecules represented by Formula 1 and liquid crystal; a); Dropping the organic molecular liquid crystal mixture on one side of the substrate of the array substrate or the common electrode substrate (step b); Coalescing the two substrates such that the organic molecular liquid crystal mixture is positioned between the two substrates (step c); And a step (step d) of heat-treating the coalesced substrate and cooling to room temperature.
The organic molecules may be mixed in an amount of 0.01 to 10 parts by weight, and more preferably 0.05 to 0.5 parts by weight, based on 100 parts by weight of the liquid crystal.
When the organic molecules are mixed in an amount of less than 0.01 part by weight, an initial liquid crystal alignment is not formed and a black screen is not formed. When the amount exceeds 10 parts by weight, aggregation of organic molecules occurs in the liquid crystal and light leakage is induced Problems can arise.
In addition, when the organic molecules are mixed in an amount of 0.05 to 0.5 parts by weight, the liquid crystal aligning power and the liquid crystal solubility are optimized, thereby providing excellent black display characteristics and moving image response characteristics.
Other details of the organic molecule are as described above.
The heat treatment may be performed at a temperature of 80 to 120 DEG C for 30 to 120 minutes, more preferably at 100 DEG C for 60 minutes. When heat treatment is performed in the above range, organic molecules can be uniformly arrayed over the substrate region, and thus a liquid crystal display device free from unevenness of the screen due to uneven orientation can be manufactured.
According to the present invention, a liquid crystal alignment layer is realized using organic molecules including a non-covalent bonding unit capable of bonding with a substrate and a rigid ring structure having light emission characteristics, thereby uniformly arranging liquid crystal molecules without a conventional polyimide alignment layer And can simultaneously realize the light emitting property. By implementing the light emitting characteristic, it is possible to realize the color without using the conventional color filter layer, thereby reducing the manufacturing cost of the panel and improving the panel transmittance.
1 is a schematic view of a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 shows a result of analyzing the black screen degree of a liquid crystal display device (comparative example and embodiment) in which no voltage is applied in a state that the backlight is turned on, using a DSLR camera.
3 is a graph showing a transmittance curve according to voltage of the liquid crystal display device according to the embodiment and the comparative example.
4 is a graph showing an emission spectrum of a liquid crystal display according to an embodiment of the present invention.
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.
Referring to FIG. 1, a
Example: Production of liquid crystal display device
As a first step, a mixture of 1-pyrenesulfonic acid sodium salt and liquid crystal, an organic molecule capable of noncovalent bonding, was prepared. Specifically, about 100 parts by weight of a host liquid crystal having a dielectric anisotropy (DELTA epsilon) of -3.3 (having a refractive index anisotropy (DELTA n) of 0.101 and a phase transition temperature Tni of 75 DEG C), about 0.05 part by weight of 1-pyrenesulfonic acid Sodium salt was added and stirred at 70 ° C for about 10 minutes to allow the organic molecules to completely dissolve and mix in the host liquid crystal.
As a second step, a liquid crystal display device was prepared using an organic molecule-liquid crystal mixture. Specifically, an organic molecular liquid crystal mixture was evenly dropped on a lower TFT array substrate having a pixel electrode (ITO) or an upper common electrode substrate having a common electrode (common ITO), and the two substrates were bonded together using a sealant. 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 cause the organic molecules to non-covalently bond with the substrate and simultaneously align the liquid crystal molecules vertically with organic molecules. Layer to form a liquid crystal display device.
Comparative Example
A polyimide alignment film having a thickness of about 100 nm is formed on a lower TFT array substrate having a pixel electrode (ITO) and an upper common electrode substrate having a common electrode (common ITO), and then the array substrate on which the polyimide alignment film is formed and the common electrode substrate The liquid crystal was evenly dropped and the two substrates were bonded together using a sealant. 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 produce a liquid crystal display device having a polyimide alignment film.
EXPERIMENTAL EXAMPLE 1: Analysis of Orientation Force and Electro-optical Characteristics of Liquid Crystal Display
The alignment and electro-optical characteristics of the liquid crystal display fabricated according to the Examples and Comparative Examples were analyzed. As a result of analyzing the degree of black display on the OV where the voltage was not applied to the liquid crystal display device, the liquid crystal display according to the embodiment realized a black screen without light leakage throughout the screen ( 2). As a result of confirming the alignment state of the liquid crystal through a polarizing microscope (BXP 51, Olympus), it was confirmed that the liquid crystal display device according to the example exhibited a vertical alignment power level equal to that of the liquid crystal display device according to the comparative example.
(Electro-optical characteristic measurement) with a 632-nm He-Ne laser (JDSU, 1135P), a photodetector (EOT, ET-2000), an oscilloscope (Tektronix, TBS1062) and a function generator (Agilent, 33210A) 3 shows the result of measurement of a voltage-transmittance curve according to a voltage using the system of FIG. 3. The threshold voltage of the liquid crystal display according to the embodiment is 3.5 V, The liquid crystal display device according to the embodiment exhibits a VT characteristic similar to that of the conventional liquid crystal display device (comparative example), and can display a gray scale according to a voltage .
Experimental Example 2: Analysis of Luminescence Characteristics of Liquid Crystal Display
The luminescent characteristics of the liquid crystal display according to the above embodiment are analyzed and shown in Fig. The luminescence properties were analyzed using a fluorescence spectrometer (FS-2, Scinco), using spectra measured at wavelengths from 350 to 1050 nm. 4 is a graph showing the photoluminescence spectrum. In the case of the liquid crystal display device according to the embodiment, it is confirmed that the main peak has a wavelength of 450 to 650 nm. As a result, it can be seen that the luminescent characteristics are exhibited at the blue wavelength band.
100: liquid crystal display
110: TFT array substrate
120: common electrode substrate
130: liquid crystal
140: organic molecule
141: Ring structure
142: non-covalent bonding unit (functional group)
Claims (15)
1. An organic electroluminescent device comprising an organic molecule represented by the following formula (1)
Characterized in that the organic molecules are bonded to an adjacent substrate.
[Chemical Formula 1]
In Formula 1,
a is a functional group capable of noncovalent bonding, and b is a pyrene structure having a luminescent property.
In Formula 1,
and a is at least one selected from the group consisting of a hydroxyl group, an amine group, a carboxylic acid group or a sulfonate group.
The organic molecule may be at least one selected from the group consisting of 1-aminopyrrene, 1-aminomethylpyrrene, 1-pyrenecarboxylic acid, 1-pyrenylbutyric acid, 1-pyrenebutanol, 1-pyrenesulfonic acid hydrate, And 1,3,6,8-pyrenetetrasulfone tetra-acid tetrasodium salt hydrate. 2. The liquid crystal alignment layer according to claim 1, wherein the liquid crystal alignment layer has a light-emitting property.
A common electrode substrate; And
And a liquid crystal layer interposed between the array substrate and the color substrate,
Wherein the liquid crystal layer comprises a liquid crystal and a liquid crystal alignment layer,
Wherein the liquid crystal alignment layer comprises organic molecules represented by the following Formula 1,
Wherein the organic molecules are bonded to an adjacent substrate.
[Chemical Formula 1]
In Formula 1,
a is a functional group capable of noncovalent bonding, and b is a pyrene structure having a luminescent property.
In Formula 1,
and a is at least one selected from the group consisting of a hydroxyl group, an amine group, a carboxylic acid group, and a sulfonate group.
The organic molecule may be at least one selected from the group consisting of 1-aminopyrrene, 1-aminomethylpyrrene, 1-pyrenecarboxylic acid, 1-pyrenylbutyric acid, 1-pyrenebutanol, 1-pyrenesulfonic acid hydrate, And 1,3,6,8-pyrenetetrasulfone tetraacid tetrasodium salt hydrate. The liquid crystal display device according to claim 1,
Wherein the organic molecules are bonded to adjacent substrates by non-covalent bonding.
A common electrode substrate; And
A liquid crystal layer interposed between the array substrate and the common electrode substrate,
Preparing an organic molecule-liquid crystal mixture by mixing an organic molecule represented by the following formula (1) and a liquid crystal (step a);
Dropping the organic molecular liquid crystal mixture on one side of the substrate of the array substrate or the common electrode substrate (step b);
Coalescing the two substrates such that the organic molecular liquid crystal mixture is positioned between the two substrates (step c); And
Heat-treating the bonded substrate and cooling the bonded substrate to room temperature (step d).
[Chemical Formula 1]
In Formula 1,
a is a functional group capable of noncovalent bonding, and b is a pyrene structure having a luminescent property.
In Formula 1,
and a is at least one selected from the group consisting of a hydroxyl group, an amine group, a carboxylic acid group, and a sulfonate group.
The organic molecule may be at least one selected from the group consisting of 1-aminopyrrene, 1-aminomethylpyrrene, 1-pyrenecarboxylic acid, 1-pyrenylbutyric acid, 1-pyrenebutanol, 1-pyrenesulfonic acid hydrate, And 1,3,6,8-pyrenetetrasulfonic tetraacid tetrasodium salt hydrate. 2. The method according to claim 1,
Wherein the organic molecules are mixed in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid crystal.
Wherein the heat treatment is performed at a temperature of 80 to 120 DEG C for 30 to 120 minutes.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6017465A (en) | 1995-03-16 | 2000-01-25 | Kabushiki Kaisha Toshiba | Liquid crystal display element |
| EP2113550B1 (en) | 2008-05-02 | 2011-10-12 | Sony Corporation | A composition comprising at least one type of liquid crystal |
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| JP4274713B2 (en) | 2001-09-11 | 2009-06-10 | シャープ株式会社 | Liquid crystal display device, optical element, and manufacturing method thereof |
| KR101046926B1 (en) | 2004-08-12 | 2011-07-06 | 삼성전자주식회사 | Composition for liquid crystal aligning film of liquid crystal display device |
| KR100782436B1 (en) | 2005-12-30 | 2007-12-05 | 제일모직주식회사 | Alignment Agent of Liquid Crystal |
| DE102011108708A1 (en) * | 2010-09-25 | 2012-03-29 | Merck Patent Gmbh | Liquid crystal displays and liquid crystal media with homeotropic alignment |
| KR101976215B1 (en) * | 2012-09-17 | 2019-05-07 | 전북대학교산학협력단 | Liquid crystal aligning agent and liquid crystal display device manufactured by using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6017465A (en) | 1995-03-16 | 2000-01-25 | Kabushiki Kaisha Toshiba | Liquid crystal display element |
| EP2113550B1 (en) | 2008-05-02 | 2011-10-12 | Sony Corporation | A composition comprising at least one type of liquid crystal |
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