KR20140067505A - Liquid crystal display device and method of fabricating the same - Google Patents

Abstract

The present invention provides a liquid crystal display comprising: a first substrate; A second substrate facing the first substrate; And a liquid crystal layer interposed between the first and second substrates and including a first content of liquid crystal dendrimer, wherein the liquid crystal layer moves to a surface of the first and second substrates and is densely arranged, Wherein the liquid crystal molecules are arranged in one direction in the first direction by the liquid crystal dendrimer having a property of arranging the liquid crystal molecules in the layer in one direction, and a method of manufacturing the same.

Description

[0001] The present invention relates to a liquid crystal display device and a manufacturing method thereof,

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of initially orienting liquid crystal molecules in a liquid crystal layer in one direction without an orientation film accompanied by a process such as rubbing.

Recently, liquid crystal display devices have been attracting attention as next generation advanced display devices with low power consumption, good portability, and high value-added.

In general, a liquid crystal display device is driven by using optical anisotropy and polarization properties of a liquid crystal. Since the liquid crystal has a long structure, it has a directionality in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular alignment direction of the liquid crystal by optical anisotropy, so that image information can be expressed.

At present, active matrix liquid crystal display devices (hereinafter, abbreviated as liquid crystal display devices) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner have been receiving the most attention because of their excellent resolution and video realization ability.

1 is a cross-sectional view of a general liquid crystal display device.

As shown in the figure, the general liquid crystal display device 1 has a structure in which the array substrate 10 and the color filter substrate 20 are attached to each other with the liquid crystal layer 30 interposed therebetween.

The lower array substrate 10 is provided with a plurality of gate wirings (not shown) and data wirings (not shown) arranged vertically and horizontally on the upper surface thereof to define a plurality of pixel regions P, A thin film transistor Tr is provided at one of the intersections of the pixel electrodes 18 and the pixel electrodes 18 provided in the pixel regions P in a one-to-one correspondence.

The color filter substrate 20 has a lattice which surrounds each pixel region P so as to cover the gate wiring (not shown), the data wiring (not shown) and the thin film transistor Tr, Green and blue color filter patterns 26a and 26b (hereinafter referred to as red, green and blue color filter patterns) 26a and 26b which are sequentially and repeatedly arranged in correspondence to the respective pixel regions P within the black matrix 24 of these lattice- And 26c are formed on the surface of the color filter layer 26. A transparent common electrode 28 is provided over the entire surface of the color filter layer 26. [

In order to prevent leakage of the liquid crystal layer 40 interposed between the two substrates 10 and 20, the seal pattern 70 is provided along the outermost edge of the non-display area NA. 10, and 20) and the liquid crystal layer 40, upper and lower alignment films 30 and 19 for giving an initial alignment state of liquid crystal molecules are interposed.

Therefore, in the liquid crystal display device 1 having such a configuration, the ON / OFF signals of the thin film transistor Tr are sequentially applied to the gate wiring (not shown) When an image signal of a data line (not shown) is transmitted to the pixel electrode 18, liquid crystal molecules constituting the liquid crystal layer 40 are driven by a vertical electric field therebetween. As a result, Can be displayed.

A manufacturing process of the conventional liquid crystal display device 1 having such a configuration will be described briefly.

The array substrate 10 is formed by forming a thin film transistor Tr which is a switching device through a deposition process, a photo-lithography process and an etching process, and a pixel corresponding to each switching device, And an array pattern in which gates and data lines (not shown) are crossed with the thin film transistor Tr as a center and pad portions (not shown) are formed at one end of each of the lines .

The counter substrate 20 has a color filter layer (black matrix) BM on which color filter patterns 26a, 26b and 26c of red, green and blue are periodically repeated on the surface facing the array substrate 10 26 are formed, and the color filter layer 26 is covered to form a common electrode.

Thereafter, the array substrate 10 and the counter substrate 20 fabricated as described above are filled with liquid crystal between the two substrates 10 and 20, and then they are bonded together to form a liquid crystal panel. And the liquid crystal display device 1 is commercialized.

The liquid crystal display device 1 completed and manufactured by such a manufacturing method makes use of the electro-optical effect of the liquid crystal, and the electro-optical effect is determined by the anisotropy of the liquid crystal itself and the molecular arrangement state of the liquid crystal, Has a great effect on stabilizing the image display quality in the liquid crystal display device.

The liquid crystal display 1 described above is performing an alignment process for evenly arranging the initial alignment of the liquid crystal molecules in the liquid crystal layer 40 interposed between the array substrate 10 and the counter substrate 20. [

The alignment process is roughly divided into a printing process of alignment films 19 and 30 for forming the alignment films 19 and 30 on the substrates 10 and 20 and a process for forming alignment films 19 and 30 on the alignment films 19 and 30 formed on the substrates 10 and 20 And a surface treatment process of the orientation films 19 and 30 for forming polymer chains having directionality in a predetermined direction.

The printing process of the alignment films 19 and 30 is a process of forming polyimide which is a high molecular material mainly used as the alignment films 19 and 30 with a uniform thickness on the entire surface of the array substrate 10 or the counter substrate 20.

More precisely, the alignment films 19 and 30 are not formed on the entire surfaces of the substrates 10 and 20, but only in the display region where the liquid crystal layer 40 is to be formed, that is, an image is displayed.

Therefore, if the alignment films 19 and 30 are formed on the entire surfaces of the substrates 10 and 20 by spin coating or the like, the etching process is further advanced to remove the alignment films 19 and 30 formed in the non- The alignment films 19 and 30 are formed on the substrates 10 and 20 by printing on the substrates 10 and 20 using a transfer plate (not shown) previously patterned so as to correspond to the display area .

Thereafter, the substrates 10 and 20 on which the alignment films 19 and 30 are formed are maintained in the drying furnace and the curing furnace respectively for an appropriate time to remove water in the alignment film and cured so as to maintain an appropriate hardness.

Next, surface treatment of the alignment films 19 and 30 is performed in order to form a high injection chain having a certain directionality on the surfaces of the cured alignment films 19 and 30. The surface treatment process of the alignment films 19 and 30 Is being carried out by rubbing.

2 is a cross-sectional view briefly showing a conventional surface treatment process of an alignment film by rubbing, which shows a surface treatment process of an array substrate.

As shown in the figure, when the array substrate 10 on which the alignment film 19 is formed is placed on the stage 45 of the rubbing apparatus, the rubbing roll 50 on which the rubbing cloth 55 made of a material such as rayon is wound, And is held at a constant gap with the array substrate 10, and at the same time, the rubbing roll 50 is rotated at a high speed.

At this time, the rubbing cloth 55 attached to the surface of the rubbing roll 50 comes into contact with the alignment layer 19 on the array substrate 10 to rub the surface of the alignment layer 19.

More precisely the rubbing cloth 55 attached to the surface of the rubbing roll 50 at high speed is brought into contact with the array substrate 10 and the stage 45 or the rubbing roll 50 is rotated at a constant speed in one direction The surface of the alignment layer 19 on the array substrate 10 is rubbed with the rubbing cloth 55 and the polymer chain (side chain) formed internally on the surface of the alignment layer 19 is aligned in one direction.

Therefore, the polymer chain (side chain) of the surface of the alignment film 19 is more accurately oriented in a certain direction.

However, the surface treatment of the alignment film 19 by the rubbing method has the following problems.

The rubbing cloth 55 made of a material such as rayon rubs against the array substrate 10 so that the portals 57 on the surface of the rubbing cloth 55 are separated from the rubbing cloth 55, And much dust particles are generated from the rubbing cloth 55 itself, which adversely affects the manufacture of a liquid crystal display device requiring super cleanliness.

Therefore, in order to remove particles and fine dust remaining on the array substrate 10 as a countermeasure to such a problem, the cleaning and drying process is necessarily performed after the rubbing process. This increases the investment cost for manufacturing the liquid crystal display device, which ultimately raises the manufacturing cost of the liquid crystal display device.

Further, static electricity is generated on the array substrate 10 by rubbing against the array substrate 10 by the rubbing cloth 55, thereby disconnection of the wiring formed on the substrate 10 or deterioration of the switching device characteristics And the like.

Therefore, since the conventional liquid crystal display device must separately perform the formation of the alignment film 19 and the surface treatment described above, the productivity per unit time is lowered, the manufacturing cost is increased, the defects are caused by the generation of particles or static electricity, And the like.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a liquid crystal display device which is capable of eliminating the steps of forming an alignment film using an alignment film printing apparatus, And it is an object of the present invention to provide a liquid crystal display device capable of reducing the manufacturing cost by improving the productivity per unit time by simplifying the process steps while at the same time preventing the occurrence of defects caused by the defects.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a first substrate; A second substrate facing the first substrate; And a liquid crystal layer interposed between the first and second substrates and including a first content of liquid crystal dendrimer, wherein the liquid crystal layer moves to a surface of the first and second substrates and is densely arranged, And the liquid crystal molecules are arranged in one direction in the first direction by the liquid crystal dendrimer having the property of arranging the liquid crystal molecules in the layer in one direction.

Here, the liquid crystal dendrimer is characterized by comprising a dendrimer having one molecule at the center and a plurality of reactors at the periphery of the molecule, and a mesogen compound having a first terminal group and a second terminal group at the terminal.

The dendrimer and the mesogen compound are connected by the first terminal group. The mesogen compound is composed of a cyclohexyl phenyl group and C ₆ H ₁₁ as the second terminal group Feature.

In addition, the first terminal unit may include:

Is a substance having a structural formula of

Preferably, the dendrimer has the first to fifth generation structures, and the first content is 0.1 to 1 wt% of the entire liquid crystal layer.

In addition, a gate line and a data line crossing each other on the inner surface of the first substrate and defining a pixel region, a thin film transistor provided in each pixel region, and a pixel electrode connected to the thin film transistor, And a common electrode and a color filter layer are formed on inner surfaces of the first substrate or the second substrate.

The method of manufacturing a liquid crystal display device according to an embodiment of the present invention is the method of manufacturing a liquid crystal display device according to any one of claims 1 to 7, wherein the first substrate and the second substrate are cemented Forming a panel having an injection port; And forming a liquid crystal layer by injecting a liquid crystal including the dendritic polymer for a liquid crystal in a first temperature atmosphere after forming an atmosphere of the inside of the panel, wherein the liquid crystal layer is formed by the liquid crystal dendrimer, The liquid crystal molecules in the liquid crystal are initially arranged in one direction in the liquid crystal injection step, thereby omitting the formation of the alignment film and the step of surface treatment of the alignment film.

At this time, the first temperature is 15 to 70 ° C.

A gate line and a data line crossing the inner surface of the first substrate to define a pixel region; forming a thin film transistor and a pixel electrode connected to the thin film transistor in each pixel region; And forming a common electrode and a color filter layer on the inner surface of one of the first substrate and the second substrate.

The liquid crystal display according to the embodiment of the present invention does not require a separate alignment film for initial alignment of the liquid crystal molecules in the liquid crystal layer, and therefore it is not necessary to carry out alignment film formation and surface treatment processes.

Therefore, the manufacturing process of the liquid crystal display device can be simplified, and the productivity per unit time can be improved, thereby reducing the manufacturing cost.

Also. There is an effect of originally preventing defects due to the generation of particles and static electricity generated by the progress of the alignment process by the conventional rubbing.

Since the alignment film printing device and the rubbing device are not required, there is an effect of reducing the initial facility investment cost for manufacturing the product.

1 is a schematic view of a general liquid crystal display device.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rubbing method.
3 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.
4 is a view showing structures of first to fifth generations of a general dendrimer;
Fig. 5 is a view showing a configuration of a general dendrimer, a first terminal and a mesogen compound before formation of a liquid crystal dendrimer used in the present invention. Fig.
6 is a diagram illustrating the structure of a liquid crystal dendrimer contained in a liquid crystal layer, which is a component of a liquid crystal display device according to an embodiment of the present invention.
FIGS. 7A to 7C are cross-sectional views illustrating a step of injecting liquid crystal mixed with a liquid crystal dendrimer having a proper content ratio in a liquid crystal display according to an embodiment of the present invention. Fig.

Hereinafter, a configuration of a liquid crystal display according to an embodiment of the present invention will be described with reference to the drawings.

3 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

The liquid crystal display device 101 according to the embodiment of the present invention includes an array substrate 110 and an opposing substrate 150 and a liquid crystal layer 190 interposed between the two substrates 110 and 150 .

First, a gate wiring (not shown) and a data wiring 130 are formed on the array substrate 110 to define a plurality of pixel regions P intersecting with each other and a data wiring 130 connected to these wirings (not shown) A gate electrode 115 as a switching element, a gate insulating film 118 as a switching element, a semiconductor layer 120 composed of an active layer 120a and an ohmic contact layer 120b, A drain electrode 136 and a drain electrode 136 of the thin film transistor Tr are formed on the passivation layer 140 in each pixel region P, And a pixel electrode 148 connected through a contact hole 143 is provided.

The counter substrate 150 is provided with a color filter layer 155 composed of red, green and blue color filter patterns R, G and B corresponding to the pixel regions P in order and repetitively, And a common electrode 157 made of indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) which is a transparent conductive material.

The counter substrate 150 is provided with a black matrix 153 for suppressing the transmission of light to the boundaries of the red, green and blue color filter patterns R, G and B, more precisely at the boundaries of the pixel regions P, .

At this time, a plurality of rivets (not shown) having a convex shape corresponding to each pixel region P may be selectively provided on the common electrode 157. The rivets (not shown) induce distortion of the vertical electric field generated by the pixel electrode 148 and the common electrode 157 to form a multi-domain, thereby widening the viewing angle.

Meanwhile, the liquid crystal display device 101 including such components can be variously modified in accordance with its driving mode.

That is, although the common electrode 157 is formed on the entire inner surface of the counter substrate 150 in the embodiment of the present invention, the common electrode 157 may be formed on the common electrode 157 may be omitted in the counter substrate 150 and may alternatively be formed in the pixel regions P of the array substrate 110 alternately with the pixel electrodes 148.

In this case, the pixel electrode and the common electrode alternating in each pixel region P form a bar shape. In the liquid crystal display device having such a structure, the horizontal direction between the adjacent pixel electrodes and the common electrode And is driven by an electric field.

As another modification, the common electrode may be formed in a form having a bar-shaped opening (not shown) corresponding to each pixel region P on the entire display region of the array substrate. In this case, The liquid crystal display device having such a configuration has a structure in which the electrodes are formed in a plate shape in each pixel region P, and the fringe field generated by the common electrode having a plurality of bar- .

As another modification, the color filter layer 155 provided on the counter substrate 150 may be omitted from the counter substrate 150 and may be formed on the array substrate 110.

In the meantime, between the array substrate 110 and the counter substrate 150 having such a configuration, the most characteristic constituent elements of the liquid crystal display device 101 according to the embodiment of the present invention include an initial arrangement of liquid crystal molecules And a liquid crystal layer 190 in which liquid crystal molecules are initially aligned in one direction without an alignment layer including an appropriate amount of a dendrimer for inducing the alignment of the liquid crystal molecules.

Although not shown in the drawings, the liquid crystal display device 101 according to the embodiment of the present invention having such a configuration is provided with first and second polarizing plates 101, (Not shown), and a backlight unit (not shown) further includes a light source on the outer surface of the first polarizer (not shown).

FIG. 4 is a diagram showing the simplest structure of a general dendrimer and dendrimer structures of the first to fifth generations, and FIG. 5 is a graph showing the relationship between the general dendrimer before the formation of the liquid crystal dendrimer and the first terminal and the mesogen compound FIG. 6 is a diagram illustrating the structure of a liquid crystal dendrimer contained in a liquid crystal layer, which is a component of a liquid crystal display device according to an embodiment of the present invention.

Dendrimers are monodisperse, defined as star-shaped hyperbranched macromolecules with constant molecular weight and expected as model compounds for myoglobin or cytochrome c.

As shown in the figure, the dendrimer has a structure in which a constant unit structure of a branch shape repeatedly extends from its center, and its center is mainly composed of a molecule composed of nitrogen (N) and the like, And a reactor capable of reacting with various chemical units outside thereof.

On the other hand, the stage in which the dendrimer grows is defined as a generation, and each time a reactor which is a constantly repeated unit structure is added, a generation increases. The configuration of the first to fifth generations (G1 to G5) As shown in Fig.

The dendrimer provided in the liquid crystal layer of the liquid crystal display according to the embodiment of the present invention is characterized in that a mesogen compound having a structure similar to liquid crystal is attached to a dendrimer having the above structure.

The structure of the dendritic polymer for liquid crystal used in the present invention will be described in more detail. The structure of the dendrimer of the first to fifth generations (G1 to G5) shown in FIG. 4 serves as a flexible spacer , And a mesogen compound (MC) having a terminal group (T2) at the terminal thereof is attached to the terminal group (T1).

At this time, the first terminal unit (T1) reacts directly with the reactor of the dendrimer and attaches to the reactor of the dendrimer. The first terminal unit (T1) is attached to the reactor of the dendrimer, and the mesogen compound ) Plays a role of having fluidity. By this role, the first terminal unit (T1) is named as a flexible spacer.

The first terminal unit (T1) having such a role is characterized by having a molecular structure including six carbons as shown in an example.

On the other hand, the mesogen compound (MC) includes mesogen (mesogen) composed of a cyclohexyl phenyl group and a molecule composed of C ₅ H ₁₁ as a second terminal group (T2) . In the mesogen compound (MC), the second terminal (T2) may be variously modified.

The mesogen compound (MC) has a structure substantially similar to that of the liquid crystal molecules constituting the liquid crystal layer (190). Accordingly, the mesogen compound (MC) has a very similar structure to the liquid crystal molecule, and the mesogen compound (MC) influences the surrounding liquid crystal molecules by the action of the mesogen compound (MC).

That is, when the molecules of the mesogen material are aligned in one direction in the mesogen compound (MC), the liquid crystal molecules located in the periphery of the mesogen material are characterized by arranging them in the same direction under the influence of the molecules of the mesogen material .

The liquid crystal display according to an embodiment of the present invention is characterized in that the liquid crystal molecules in the liquid crystal layer can be aligned at an initial stage without using an alignment film by using the phenomenon of mesogen materials and liquid crystal molecules.

On the other hand, the liquid crystal layer 190 included in the liquid crystal display according to the embodiment of the present invention is mixed with the liquid crystal dendrimer in an amount of about 0.1 to 1% by weight of the total content.

In the liquid crystal layer 190, if the liquid crystal dendrimer is less than 0.1 wt%, the amount of dendrimer denser on the surfaces of the substrates 110 and 150 is small, The dendrimer is moved to the surfaces 110 and 150 of the substrate and then the liquid crystal layer 190 is formed in a central portion of the liquid crystal layer 190. In this case, It acts as an element that interferes with the behavior of the molecule, which causes the driving failure of the liquid crystal.

Therefore, in order to prevent such a problem, it is preferable that the amount of the liquid crystal dendrimer to be mixed with the liquid crystal is 0.1 to 1% by weight of the total content.

Hereinafter, a method of manufacturing the liquid crystal display device 101 according to the embodiment of the present invention having the above-described configuration will be described. At this time, in forming the array substrate 110 and the counter substrate 150 in the liquid crystal display device according to the embodiment of the present invention, since the liquid crystal display device having the general alignment film proceeds in the same manner, the liquid crystal dendrimer having different characteristics is included The method of forming the liquid crystal layer will be mainly described.

FIGS. 7A to 7C are cross-sectional views illustrating a step of injecting liquid crystal mixed with a liquid crystal dendrimer having a proper content ratio in a liquid crystal display according to an embodiment of the present invention. Fig. At this time, the elements provided in the array substrate and the counter substrate are omitted, and only changes in the elements in the liquid crystal layer are shown briefly.

First, as shown in Fig. 7A, after a liquid crystal dendrimer having the above-described molecular structure is mixed with a liquid crystal so as to have a proper content ratio (0.1 to 1% by weight of the total content) The array substrate 110 and the counter substrate 150 are bonded together to form a panel state.

When a liquid crystal material mixed with a liquid crystal dendrimer is injected between the array substrate 110 and the counter substrate 150 through the inlet of the panel in a temperature atmosphere of room temperature (typically 15 to 25 ° C) to 60 ° C, The dendrimer for liquid crystal initially mixes with the liquid crystal material and moves to the surfaces of the substrates 110 and 150 to be concentrated on the surfaces of the substrates 110 and 150 as shown in FIG. .

At this time, the mesogen compound (MC) attached via the first terminal unit (T1 in Fig. 5) serving as the flexible spacer and the reactor of the liquid crystal dendrimer is bonded to the first terminal unit T1 of FIG. 5).

Therefore, the liquid crystal dendrimer (LD) densely formed on the surfaces of the substrates 110 and 150 functions as an alignment film by the mesogen compound MC arranged in one direction, so that the mesogen compound The liquid crystal molecules 191 having a similar structure are aligned in the aligned direction.

Therefore, the liquid crystal molecules 191 in the liquid crystal layer 190 injected into the panel are initially aligned in one direction by the action of the liquid crystal dendrimer LD without the alignment layer.

The mesogen compound MC provided in the liquid crystal dendrimer LD is arranged in a direction perpendicular to the substrates 110 and 150 so that the liquid crystal molecules 191 in the liquid crystal layer 190 have a long axis Are aligned perpendicular to the surfaces of the substrates 110 and 150 along the direction in which the humectant compound (MC in FIG. 5) is disposed.

3, in the liquid crystal display device 101 in which the liquid crystal molecules 191 are initially arranged perpendicularly to the substrates 110 and 1150, the pixel electrodes 148 are common to the array substrate 110 The electrodes 157 are provided on the counter substrate 150 and can be driven in a VA mode implemented by the vertical electric field generated by these two electrodes 148 and 157.

Referring to FIGS. 5 and 7C, it is shown that the mesogen compound MC provided in the liquid crystal dendrimer is arranged in an initial state perpendicular to the surfaces of the substrates 110 and 150. However, The first terminal unit T1 serving as a flexible spacer which contacts the reactor of the liquid crystal dendrimer at the same time as the mesogen compound MC is appropriately controlled so that the mesogen compound MC is immobilized on each substrate 110, The alignment state of the liquid crystal molecules 191 in the liquid crystal layer 190 is changed according to the arrangement of the mesogen compound MC so that the liquid crystal layer 190 ) May be arranged horizontally or at a predetermined inclination angle on the substrate surface.

In this case, the liquid crystal display device 101 may operate in any one of a TN mode, a transverse electric field mode, and a fringe field switching mode.

On the other hand, as described above, when the content of the liquid crystal dendrimer that induces the initial alignment of the liquid crystal molecules is about 0.1 to 1 wt% of the total content, it is preferable that the structure of the first to fifth generations It can be seen experimentally.

If the dendrimer of a larger generation than the fifth generation is used, not only the cost of the dendrimer is increased, but also the movement time of the dendrimer itself to the surfaces of the substrates 110 and 150 is increased due to the increase of the weight of the dendrimer itself. The density of the liquid crystal layer 190 decreases and the number of the liquid crystal layer 190 located at the center of the liquid crystal layer 190 increases.

Therefore, in the case of the liquid crystal dendritic polymer, the first to fifth generation structures are characterized by including a dendritic polymer.

At this time, the liquid crystal layer 190 containing the liquid crystal dendrimer having the above-described structure is bonded to the array substrate 110 and the counter substrate 150, and the remaining portion except the injection port is sealed using a seal pattern (not shown) And the liquid crystal is injected by a capillary phenomenon caused by a pressure difference after forming an atmosphere of vacuum between the array substrate 110 and the counter substrate 150 in a sealed state.

It is understood that the liquid crystal layer 190 formed by injecting the liquid crystal by the above method is preferable for the initial alignment of the liquid crystal molecules 191 inside the liquid crystal dendrimer in the desired action.

Referring to FIG. 3, in the case of the liquid crystal display device 101 according to the embodiment of the present invention for forming a liquid crystal layer as described above, a separate alignment film for initial alignment of liquid crystal molecules in the liquid crystal layer 190 Further, a rubbing process for the surface treatment of the orientation film is not required.

Therefore, since the alignment film printing apparatus and the rubbing apparatus are not included in the manufacturing line for manufacturing the liquid crystal display device 190, the initial facility investment cost for manufacturing the liquid crystal display device 101 can be reduced.

Further, since the liquid crystal display device 101 according to the embodiment of the present invention can omit the alignment film formation process and the alignment film surface treatment process, the process simplification is realized and the productivity per unit time is improved. And the defective rate due to the generation of particles and static electricity is reduced, thereby improving the production yield of products.

Further, since the alignment film is not required, the effect of reducing the material cost is obtained.

110: array substrate
150: opposing substrate
190: liquid crystal layer
191: liquid crystal molecule
LD: dendrimer for liquid crystal

Claims (11)

A first substrate;
A second substrate facing the first substrate;
A liquid crystal layer interposed between the first and second substrates and including a first content of liquid crystal dendrimer,
Wherein the liquid crystal molecules are moved to the surfaces of the first and second substrates to be densely arranged and the liquid crystal molecules are aligned by the dendrimer for liquid crystal having the property of arranging the liquid crystal molecules in the liquid crystal layer in one direction And the liquid crystal display device is arranged in a first direction.
The method according to claim 1,
The above-
A dendrimer having one molecule at the center and a plurality of reactors at the periphery of the molecule; and a mesogen compound having a first terminal group and a second terminal group at the terminal.
3. The method of claim 2,
Wherein the dendrimer and the mesogen compound are connected by the first terminal.
3. The method of claim 2,
The mesogen compound may be,
A cyclohexyl phenyl group and C ₆ H ₁₁ as the second terminal group.
3. The method of claim 2,
Wherein the first terminal unit comprises:

Wherein the liquid crystal display device is a liquid crystal display device.
The method according to claim 1,
Wherein the dendrimer has any one of the first through fifth generations.
The method according to claim 1,
Wherein the first content is 0.1 to 1% by weight based on the entire content of the liquid crystal layer.
The method according to claim 1,
A gate line and a data line crossing the inner surface of the first substrate to define a pixel region, a thin film transistor provided in each pixel region, and a pixel electrode connected to the thin film transistor and formed in each pixel region And,
Wherein a common electrode and a color filter layer are provided on inner sides of any one of the first substrate and the second substrate.
A method of manufacturing a liquid crystal display device according to any one of claims 1 to 8,
Attaching the first substrate and the second substrate together to form a panel having an injection port;
A step of forming a liquid crystal layer by injecting a liquid crystal including the dendritic polymer for liquid crystal in a first temperature atmosphere after creating an atmosphere of vacuum inside the panel
Wherein liquid crystal molecules in the liquid crystal layer are initially arranged in one direction in the liquid crystal injection step by the liquid crystal dendrimer to omit the step of forming the alignment film and the step of processing the surface of the alignment film, ≪ / RTI >
10. The method of claim 9,
Wherein the first temperature is 15 to 70 占 폚.
10. The method of claim 9,
A gate line and a data line crossing each other on the inner surface of the first substrate and defining a pixel region; forming a thin film transistor and a pixel electrode connected to the thin film transistor in each pixel region;
Forming a common electrode and a color filter layer on the inner surface of either one of the first substrate and the second substrate;
And the second electrode is electrically connected to the second electrode.

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