TW201122002A - Liquid crystal alignment composition and method for manufacturing liquid crystal display device. - Google Patents

Abstract

The invention provides a liquid crystal alignment composition and a method for manufacturing a liquid crystal display device using the liquid crystal alignment composition. The liquid crystal alignment mainly comprises at least one heterocyclic monomer and an acrylic monomer. The heterocyclic monomer and the acrylic monomer mutually react and polymerize to form a liquid crystal alignment layer on two corresponding surfaces located within the liquid crystal accommodation space of the substrate. Accordingly, disposing the alignment layer on the substrate in advance while manufacturing the liquid crystal display device is not necessary, thereby the manufacturing processes and costs can be effectively reduced.

Description

201122002 VI. Description of the Invention: [Technical Field] The present invention relates to a liquid crystal alignment composition, particularly a liquid crystal alignment composition having a heterocyclic monomer. [Prior Art] The liquid crystal alignment technology is one of the key technologies for determining the quality of the surface of a liquid crystal display device. Only a stable and uniform initial arrangement of the liquid crystal material in the liquid crystal display panel can present a high quality kneading surface. Generally, a liquid crystal display device has a thin layer for inducing alignment of liquid crystal molecules, which is called a liquid crystal alignment layer. In industrial processes, the rubbing method is often used to uniformly align liquid crystal molecules, and the liquid crystal alignment layer is mechanically rubbed, such as uniformly moving woven fabric, so that parallel alignment micro-grooves are formed on the liquid crystal alignment film. , the orientation of the liquid crystal molecules can be achieved. The liquid crystal alignment layer materials currently used in liquid crystal display devices include polystyrene, polyamidiamine, polyvinyl alcohol, polyester, epoxy resin, polyurethane, polystone, and the like. Among them, the most common and commonly used is polyimide. Since the molecules of polyimine have an imide, the polymer backbone has a high rigidity and a strong intermolecular force, and it has excellent homogeneity and durability. Therefore, it is suitable for use with the friction process. The use of the mechanical friction method has the advantages of low cost, stable process, good alignment uniformity, and easy control of the pretilt angle, and is widely used in the manufacture of liquid crystal panels. In the conventional process of manufacturing a liquid crystal display device, the substrate on the liquid crystal display device is first subjected to liquid crystal alignment processing, and the two substrates are separately cleaned, and then the surface of the substrate is treated with a liquid crystal alignment layer material, and finally rubbed. Complete the liquid crystal alignment process. After the substrate is processed by the liquid crystal alignment, the processes of assembly, cutting, and liquid crystal injection can be performed. That is to say, in order to enable the substrate on the liquid crystal display device to have an alignment capability, it is necessary to use a complicated procedure before it is used, which consumes considerable time and processing cost. In addition, when the liquid crystal alignment layer is processed by the rubbing method, static electricity and fine dust are generated, and the thin crystal cell is destroyed or the pollution is caused by the 201122002, and the quality of the liquid crystal display device is lowered. At present, a multi-domain Vertically AHgned Liquid Crystal Display (MVA-LCD) has been developed which uses a combination of a negatively-induced anisotropic liquid crystal and a vertical alignment layer to achieve vertical alignment. effect. Such a liquid crystal display device has excellent contrast and a wide viewing angle, and its alignment layer can be processed without being subjected to the aforementioned rubbing method, and is simpler in manufacturing, and is widely accepted by the industry. However, the liquid crystal display device still needs to be provided with an alignment layer of a polyimine or the like, and the high cost of the polyimide does not effectively reduce the cost of manufacturing such a liquid aa display device, except that the complexity in the manufacturing process cannot be reduced. . SUMMARY OF THE INVENTION The main object of the present invention is to reduce the manufacturing process of the liquid crystal display device and to reduce the fabrication site. The present invention provides the liquid crystal alignment composition, comprising: a heterocyclic ring of the following formula (I) -R2 XV (1) R3 ', medium Rl, Han 2, and 3 are respectively selected from the group consisting of the following formula (I_a), formula (Ib), .e), and formula (4):

4 201122002 (I-c) (I-d) wherein n is an integer, ^ is an integer of 21, and X is a hydrogen group or a methyl group;

Like the following formula (II) acrylic monomer:

Wherein 1 is an integer of gl, and the X2 is a hydrogen group or a methyl group. The mixing weight ratio of the heterocyclic monomer to the acrylic monomer is between 1:2.5 and 1:50. Further, the liquid crystal alignment composition may further have a hardening initiator. The invention further provides a method for manufacturing a liquid crystal display device, comprising the steps of: a) providing two corresponding parallel substrates, and forming a liquid crystal accommodating space between the two substrates; b) sealing a liquid crystal material and a liquid crystal alignment composition In the liquid crystal accommodating space, the liquid crystal alignment composition comprises a heterocyclic monomer of the above formula (I) and an acrylic monomer of the above formula (II); and c) polymerizing the liquid crystal alignment composition on the substrate Located on a corresponding surface in the liquid crystal accommodating space to form a liquid crystal alignment layer. In another embodiment of the present invention, the method further comprises the step of applying a voltage to the liquid crystal composition between the step b) and the step c), the heterocyclic monomer of the liquid crystal material and the acrylic single The body is deflected to a predetermined direction, and then polymerized to form a vertical alignment through step c) to increase the 201122002 strong tin anchoring force. Wherein in the step b), the liquid crystal composition is sealed in the liquid crystal accommodating space by a perfusion method or a drop drop (ODF). In step c), the heterocyclic monomer is polymerized by energy light irradiation of the polymerized single system represented by the acrylic monomer, and the energy light is visible light or ultraviolet light. The liquid crystal alignment composition disclosed in the present invention has a three-functional group which can enhance the descriptive ability to improve the brightness and contrast of the panel to achieve a rapid liquid crystal vertical alignment reaction. On the other hand, the present invention effectively simplifies the manufacturing method of the liquid crystal display device, and the substrate can be used without first performing the liquid crystal alignment treatment, and the time required for the polyimine layer material to be previously set on the substrate and the rubbing method to be reduced in advance is greatly reduced; It also avoids the problem of using the friction method to reduce the yield of the product. The present invention further omits the arrangement of the polyimine layer, and in addition to the mechanical or consumable cost required for the processing, the manufacturing cost of the liquid crystal display device is also effectively reduced. [Embodiment] The detailed description and technical contents of the present invention will now be described with reference to the following drawings: The present invention discloses a liquid crystal alignment composition 'comprising a heterocyclic monomer having the following formula (I) and having the following formula ( The composition of the acrylic monomer of II); the heterocyclic monomer of the formula (I):

Rl^rfN^R2 N 丫N (I) R3 wherein Ri, &, & are selected from the following formulas (Ι-a), (17), 仏c), and (Id) A group consisting of groups, the R1, &, Rs may be the same, different or partially identical functional groups: 201122002

Wherein η is an integer of SO, m is an integer, \! is a hydrogen group or a mercapto group; and the acrylic monomer of the formula (II): ΐ Η Χ 2

(ID

I I r '1' Ί I H-C~C —C-〇—|_Q_j—C-Η wherein, 1 is an integer, and the oxime 2 is a hydrogen group or a methyl group. The mixing weight ratio of the above heterocyclic monomer of the formula (I) to the acrylic monomer of the formula (II) is between 1:2" and k50. The heterocyclic monomer of the formula (I) and the acrylic monomer of the formula (II) are mutually polymerized by energy light irradiation to form a liquid crystal alignment polymer, and the energy light may be visible light or ultraviolet light, and the energy intensity is 20.1 mj. /cm2. In order to accelerate the polymerization reaction, the heterocyclic monomer of the formula 1 may be further added with a hardening initiator before the polymerization reaction of the formula (11) acrylic dye, which is an ultraviolet light curing agent or visible light hardening initiation. Agent. In addition, the present invention further provides a method for producing a liquid display device using the liquid crystal alignment composition described above, which is widely used in various liquid crystal display devices such as MVA (Multi-domain Vertical Alignment) 'ASV (Advanced Super-V)' 201122002 Wide viewing angle liquid crystal display device such as PVA (Pattemed Vertical Alignment) or PSA (Polymer Stable Alignment). The method for manufacturing a liquid crystal display device includes the steps of: a) providing two corresponding parallel substrates, and forming a liquid crystal accommodating space between the two substrates; b) sealing a liquid crystal material and a liquid crystal alignment composition on the liquid crystal In the accommodating space, the liquid crystal alignment composition comprises a heterocyclic monomer of the above formula (1) and an acrylic monomer such as the above formula (II); and c) polymerizing the liquid crystal alignment composition on the substrate in the liquid crystal accommodating The corresponding two surfaces in the space are formed to form a liquid crystal alignment layer. Referring to Figures 1-1 through 1-4, a schematic diagram of a process flow of a preferred embodiment of the method of fabricating a liquid crystal display of the present invention is shown. First, as shown in FIG. 1-1, two parallel substrates l〇a and lb are prepared, and the plurality of spherical particles or support columns (not shown) are separated between the substrates 10a and 10b. A liquid crystal accommodating space 13 is formed. A conductive layer 12a, 12b is electrically connected to the thin film transistor (not shown) on the corresponding two surfaces of the substrate 10a, 10b in the liquid crystal accommodating space 13; the outer side of the substrate 10a, 10b There is a polarizing plate 1 ia, lib. Further, as shown in FIG. 1-2, a liquid crystal composition is sealed in the liquid crystal accommodating space 13 between the substrates 10a and 10b, and the liquid crystal composition includes a liquid crystal material 20 and a mixture of the formula (I). The ring body 31 and the acrylic body 32 of the formula (II). The liquid crystal composition can be sealed in the liquid crystal accommodating space 13 by an injection method or a one drop filling (ODF). Wherein the liquid crystal material 20 may be a vertical alignment liquid crystal material; the weight percentage of the heterocyclic monomer 31 to the liquid crystal material 20 of the formula (1) is 0.1% to 2%, and the acrylic monomer of the formula (II) is 32 pairs. The weight percentage of the liquid crystal material 20 is from 0.5% to 5% by weight. After the liquid crystal material 20, the heterocyclic monomer 31 of the formula (I) and the acrylic monomer 32 of the formula (II) are sealed in the liquid crystal accommodating space 13, the conductive layer 12a, 12b can be used to apply a voltage to the liquid crystal combination. The liquid crystal material 20, the heterocyclic monomer 31 of the formula (I) and the acrylic monomer 32 of the formula (II) are all transferred to a predetermined direction as shown in FIG. 1-3. Finally, the heterocyclic monomer 31 of the formula (I) is polymerized with the acrylic monomer 32 of the formula (II), and the substrate 10a, i〇b is located on the corresponding two surfaces in the liquid crystal accommodating space 13. A liquid crystal alignment layer 30 is formed (as shown in FIG. 1_4). In the present invention, the heterocyclic monomer 31 of the formula (I) and the acrylic monomer 32 of the formula (II) are polymerized by energy light irradiation to form a liquid crystal alignment polymer which is visible or ultraviolet light. The intensity of energy light irradiation is g〇.lmj/cm2. If the polymerization reaction time of the heterocyclic monomer 31 of the formula (I) and the acrylic monomer 32 is shortened, the heterocyclic monomer 31 of the formula (I) and the acrylic monomer of the formula (Π) are used. 32 before the polymerization reaction, a hardening initiator (not shown) may be added to promote the polymerization reaction, and the hardening initiator may be an ultraviolet curing initiator or a visible light curing initiator' and the curing initiator The weight percentage to the liquid crystal material 20 is 0.01% to 1% by weight. In summary, the present invention discloses a liquid crystal alignment composition in which a heterocyclic monomer has a trifunctional group to provide a strong anchoring force to improve panel brightness and contrast to achieve a vertical liquid crystal alignment. In addition, the present invention directly forms a liquid crystal alignment layer on the substrate by polymerizing the heterocyclic monomer of the formula (I) with the acrylic monomer of the formula (II), compared to the process of the conventional liquid crystal display device. The liquid crystal material can be aligned to simplify the process of aligning the substrate in the past, in addition to reducing the time required to manufacture the liquid crystal display device, and more because the conventional polyimide layer is not required to be disposed of. cost. Further, since it is not necessary to use a mechanical alignment treatment such as a rubbing method, the yield of the product is not increased by the generation of static electricity and fine dust. Therefore, the present invention is highly progressive and conforms to the requirements of the patent application for the invention, and the application is made according to law, and the praying office grants the patent as soon as possible. The invention has been described in detail above, but the foregoing is only a preferred embodiment of the invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention. 201122002 [Simplified Schematic Description] FIG. 1-1 to FIG. 1-4 are schematic diagrams showing a processing flow of a preferred embodiment of a method for manufacturing a liquid crystal display device of the present invention. [Description of main components] 10a, 10b. ...substrate 11a, lib.............polarizing plate 12a, 12b........conductive layer 13... .......Liquid accommodating space 20.............Liquid crystal material 30.............Liquid alignment layer 31 ..... ........ Formula (I) Heterocyclic Monomer 32.............Formula (II) Acrylic Monomer

Claims (1)

201122002 VII. Patent application scope: 1. A liquid crystal alignment composition comprising: a heterocyclic monomer as in the following formula (I): -R2 (1) wherein R, R2, and R3 are each selected from the group consisting of functional groups of the following formula (Ia), formula (Ib), formula, and formula (l d): (I-a) HICIH 1 II XICIH I onuc Η I , c SH -b C 11 CeC — Η (Id) wherein η is an integer, m is an integer, Χ is a hydrogen group or a methyl group, and - such as the following formula (II) acrylic monomer: ^ γ Μ Η (ID液晶, ΐ _ 〇 + (4) - Η where '1 is an integer, the χ 2 is a hydrogen group or a methyl group. 2 h. The liquid crystal alignment composition according to claim 1, wherein the heterocyclic monomer The mixing weight ratio of the monomer to the pressure is between 1:2.5 and 1:50. 201122002 3. The liquid crystal alignment composition according to claim 1, further comprising a hardening initiator. The liquid crystal alignment composition according to claim 1 or 3, wherein the heterocyclic monomer and the acrylic single system are polymerized by energy light irradiation. 5. The liquid crystal alignment as described in claim 4 The liquid crystal alignment composition according to item 4 of claim 4, wherein the energy light irradiation intensity is 2 〇 lmj/cm 2 . A method of a liquid crystal display device, comprising the steps of: providing two corresponding parallel substrates, and Forming a liquid crystal accommodating space between the substrates; a male, a liquid crystal material and a liquid crystal alignment composition in the liquid crystal accommodating space, the liquid crystal alignment composition comprising: a heterocyclic monomer of the following formula (I): r1yVR2 N 丫N (I) R3 wherein R, R 2 and R 3 are each selected from the group consisting of functional groups of the following formula (Ia), formula (17), formula (Ic) and formula (Id); : 12 201122002 ΐ V V o-[-c-4-c«c-h (I-d) Wherein 'n is an integer of go, m is an integer of 21, Xi is a hydrogen group or a phenyl group; and an acrylic monomer of the following formula (II): CH (II) wherein, 1 is an integer of 21, the x 2 is a hydrogen group or a decyl group; and the liquid crystal alignment composition is polymerized on the corresponding surface of the substrate in the liquid crystal accommodating space to form a liquid crystal alignment Floor. 8. The method of manufacturing a liquid crystal display device according to claim 7, further comprising the step of applying a voltage to the liquid crystal composition. 9. The method of manufacturing a liquid crystal display device according to claim 7, wherein the liquid material and the liquid crystal alignment composition are sealed in the liquid crystal accommodating space by a filling method. The method of manufacturing a liquid crystal display device according to the item 7, wherein the liquid crystal material and the liquid crystal alignment composition are sealed in the liquid crystal accommodating space by a liquid crystal dropping method. 11. The method of manufacturing a liquid crystal display device according to claim 7, wherein the liquid crystal material is a vertical alignment liquid crystal material. 12. The method of producing a liquid crystal display device according to claim 7, wherein the weight percentage of the heterocyclic compound to the liquid crystal material is 0.1% to 2% by weight. 13. The method of manufacturing a liquid crystal display device according to claim 7, wherein the weight percentage of the acrylic monomer to the liquid crystal material is 0.5% to 5% by weight. 14. The method of producing a liquid crystal display device according to claim 7, wherein a curing initiator is further added before the liquid crystal alignment composition is polymerized. 15. The method of producing a liquid crystal display device according to claim 14, wherein the hardening 13 201122002 is a weight percent of the initiator to the liquid crystal material of 〇·〇1°/. Up to 1% added. The method of producing a liquid crystal display device according to claim 7 or claim 14, wherein the heterocyclic monomer and the acrylic monomer are polymerized by irradiation with energy light. 17. The method of manufacturing a liquid crystal display device according to claim 6, wherein the light system is visible light or ultraviolet light. t 18. As shown in the patent application, the liquid crystal illuminating intensity of the surface is 20.1 mj/cm2. a method of displaying a device, wherein the energy 14