KR101041215B1 - Liquid crystal display device having a vertical alignment and a method of manufacturing the same - Google Patents

Abstract

The liquid crystal display device of the present invention comprises a pair of substrates; A support medium formed between the pair of substrates; A plurality of liquid crystal regions formed between a pair of substrates, the liquid crystal regions being surrounded by a supporting medium, wherein the supporting medium is formed of a polymer material having a polar group, and each liquid crystal region is a vertical wall formed in a direction perpendicular to the substrate surface. It is formed to surround. Each liquid crystal region is filled with liquid crystal molecules, and the liquid crystal molecules have polar groups in the normal axis direction. The liquid crystal region has a columnar shape selected from the group consisting of circular, elliptical and polygonal cross sections when viewed in a direction perpendicular to the substrate surface.

Liquid crystal display device, vertical alignment, polar liquid crystal material, polar polymer material, electrostatic interaction

Description

Liquid crystal display device having a vertical alignment and a method of manufacturing the same

 The present invention relates to a liquid crystal display device having a vertical alignment and a method of manufacturing the same, and more particularly, to a liquid crystal display device for aligning the liquid crystal molecules perpendicular to the substrate surface without the alignment film treatment and a method of manufacturing the same.

In the currently commercially available liquid crystal display device, an alignment layer is formed on the surface of the substrate to align the liquid crystal molecules in one direction.

However, in order to form the alignment layer on the liquid crystal display device, not only an expensive alignment layer forming material material should be used, but also additional equipment such as an infrared irradiation device is required for the heat treatment process of the alignment layer, and a long time is required to heat the alignment layer. Therefore, it has been a big obstacle in mass production of liquid crystal display elements. In addition, after the heat treatment of the alignment film, a rubbing process is required, and in the rubbing process, damage to the surface of the substrate by the rubbing cloth, adsorption of impurities, and defects caused by static electricity are generated. Therefore, as the liquid crystal display device becomes larger, problems due to the process of forming the alignment layer have increased.

An object of the present invention is to provide a liquid crystal display device having a vertical alignment and a method of manufacturing the liquid crystal molecules can be aligned in a direction perpendicular to the substrate surface without the alignment film described above.

Another object of the present invention is to provide a liquid crystal display device having excellent impact resistance, uniformly vertically aligned liquid crystal molecules over a large area, a low driving voltage, and a high contrast ratio, and a method of manufacturing the same.

Another object of the present invention is to provide a flexible liquid crystal display device having a vertical alignment without an alignment layer and a method of manufacturing the same.

In order to achieve these and other objects, a liquid crystal display device according to an aspect of the present invention comprises a pair of substrate; A support medium formed between the pair of substrates; A plurality of liquid crystal regions formed between a pair of substrates, the liquid crystal regions being surrounded by a supporting medium, wherein the supporting medium is formed of a polymer material having a polar group, and each liquid crystal region is a vertical wall formed in a direction perpendicular to the substrate surface. It is formed to surround. Each liquid crystal region is filled with liquid crystal molecules, and the liquid crystal molecules have polar groups in the normal axis direction.

The liquid crystal region has a columnar shape selected from the group consisting of circular, elliptical, and polygonal cross sections when viewed in a direction perpendicular to the substrate surface, and the diameter of the cross section ranges from tens of micrometers to hundreds of micrometers.

The support medium may include a plurality of spacers supporting between the pair of substrates.

Preferably, the weight ratio of the polymer material having a polar group to the liquid crystal material having a polar group is 10 to 60%: 90 to 40%, and the polymer material having the polar group includes an ultraviolet reactive single molecule.

Moreover, the liquid crystal display element of this invention can be applied to a flexible display using a pair of board | substrate as a plastic board | substrate.

According to another aspect of the present invention, a method of manufacturing a liquid crystal display device includes preparing a pair of substrates; Forming a spacer between the pair of substrates; Mixing a liquid crystal material having a polar group and a polymer material having a polar group; Injecting mixed materials between the pair of substrates; Separating the liquid crystal material and the polymer material from the injected material; Curing the separated polymer material to form a vertical wall formed of the polymer material and surrounding the liquid crystal material by a vertical wall to form a liquid crystal region; And aligning the liquid crystal molecules of the liquid crystal material in a direction perpendicular to the substrate.

In this case, the polymer material preferably comprises UV-reactive monomolecules in a weight ratio of 10 to 60%, and the liquid crystal region has a column shape selected from the group consisting of circular, elliptical, and polygonal cross sections when viewed in a direction perpendicular to the substrate surface. to be.

In addition, forming the spacer may include disposing a ball-shaped spacer on one of the pair of substrates.

Alternatively, the step of forming the spacer may be to form the spacer by a photolithographic method using a photoresist.

In another alternative, forming the spacer may form a spacer by printing an ultraviolet reactive monomolecular material on one of the pair of substrates.

 The liquid crystal display device having the vertical alignment of the present invention as described above forms a support medium formed of a polymer material having a polar group therein so as to have a vertical wall in a direction perpendicular to the substrate, and also has a vertical wall of liquid crystal molecules having a polar group. Placed so as to be enclosed within, the polymer material having the polar group and the liquid crystal molecules having the polar group are aligned perpendicular to the substrate surface through spatial and electrostatic interactions. Therefore, even without a separate surface alignment layer, the liquid crystal molecules can be oriented perpendicular to the substrate surface, thereby reducing the manufacturing time and cost of the liquid crystal display element.

In addition, according to the present invention, since the liquid crystal molecules are surrounded by a supporting medium and are supported, an impact stability is excellent, and liquid crystal molecules are uniformly vertically aligned over a large area to obtain a liquid crystal display device having a low driving voltage and a high contrast ratio. In particular, since the present invention can be applied to a flexible liquid crystal display device, various applications are possible.

Meanwhile, in the liquid crystal display device of the present invention, since the liquid crystal molecules are encapsulated in a columnar vertical wall in an isolated form, even if an external physical shock is applied, the force is dispersed in the support medium to the liquid crystal molecules inside the unit capsule. Up to very little effect, it shows excellent stability against external shocks. That is, even if the external pressing or bending force is applied, the change in curvature of the liquid crystal region having a diameter of about 10 to 1000 μm is very small, so that the orientation of the liquid crystal molecules is little changed and the image is not distorted. Due to these advantages, the liquid crystal display device provided by the present invention has a very suitable property for flexible display using a plastic substrate.

Furthermore, the liquid crystal display device according to the present invention can be used to suit various applications because the liquid crystal display device can be adjusted to rapidly or gently increase the change in transmittance against voltage according to the relative content of the polar liquid crystal material and the polar polymer material.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the drawings, like reference numerals are used to refer to like elements.

First, a liquid crystal molecule vertical alignment method and a liquid crystal display device using the same according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In the liquid crystal display of FIG. 1, a support medium 200 is disposed between a pair of substrates 100 and 110 arranged in parallel with each other. The support medium 200 is formed to have a columnar vertical wall 210, and the liquid crystal molecules 310 are filled in the liquid crystal region 300 surrounded by the columnar vertical wall 210.

The liquid crystal region 300 is in contact with a pair of substrates in an up and down direction, and has a columnar shape surrounded by a columnar vertical wall 210 on a side surface thereof. Examples of cross-sectional views of the liquid crystal region viewed from an axis perpendicular to the substrates 100 and 110 are shown in FIGS. 2A to 2C. That is, for example, it may be a circle as shown in FIG. 2A, a rectangle as shown in FIG. 2B, or a hexagon as shown in FIG. 2C, but is not limited thereto. Other polygonal shapes, such as ellipses, closed curves or triangles, and pentagons, may also be used. Do. Therefore, the liquid crystal region 300 is not particularly limited as long as it is an anisotropic shape having a macroscopic axis of symmetry in a direction perpendicular to the substrate. The diameter d of the liquid crystal region preferably has a number of digits of 10 to 1000 µm, and the distance S between adjacent vertical walls in the supporting medium preferably has a number of digits of approximately 1 to 10 µm.

The support medium 200 is formed of a polymer material having a polar group, and has a predetermined polarity on the vertical wall 210. Examples of the polymer material having a polar group include trimethylolpropane tristhiol, trimethylopropane diallyl ether, isophorone diisocyanate ester, pentaerythrol tetramercaptopropionate (pentaerythritol tetramercaptopropionate), hexane dithiol (hexane dithiol) and other materials having a polar group may be used, and the material having a polar group in the middle or the end of the polymer chain is possible, but is not limited to the above examples.

The liquid crystal molecules 210 injected into the liquid crystal region 300 are formed of a material having a polar group in its normal direction, that is, in an axial direction having an ordinary refractive index. That is, the cylindrical liquid crystal molecules are formed of a material having a polar group in the uniaxial direction and the disk-shaped liquid crystal molecules in the long axis direction. Examples of the liquid crystal material having a polarity include Merck's model names ZLI-4330, MLC-7026, and mixtures thereof, and may be any liquid crystal material having a negative dielectric anisotropy and having a polar group in the normal direction of the liquid crystal molecules. It is not limited to the above example.

Referring to FIG. 3, an operation in which the liquid crystal molecules are aligned in the vertical direction will be described. In the present invention, the forces for causing the liquid crystal molecules to be oriented in the vertical direction may be largely divided into steric interaction and electrostatic interaction.

First, the spatial arrangement interaction will be described. As shown in FIG. 3, the vertical walls 210 of the support medium 200 and the liquid crystal molecules 310 near the surface of the vertical walls may be spaced apart by spatially interacting with each other. There is a tendency to align in a direction parallel to the straight wall 210. The smaller the diameter d of the liquid crystal region is, the larger the effect of spatial arrangement interaction is. However, if the diameter of the liquid crystal region is too small (less than 10 μm), the scattering effect of light becomes large and the luminance of the display display device is lowered. Will occur. Therefore, in the present invention, the diameter d of the liquid crystal region having a digit of 10 to 1000 µm is preferable. In addition, the distance S between adjacent vertical walls in the support medium preferably has a number of digits of about 1 to 10 탆.

Next, as an electrostatic interaction, the support medium 200 is formed of a polymer material having a polar group in the middle of the chain, and since the liquid crystal molecules also have polar groups in the normal direction of the liquid crystal molecules, an electrostatic force acts between them. . In this case, since the polar groups of the liquid crystal molecules 310 exist in the normal direction of the liquid crystal molecules, the polar groups of the liquid crystal molecules 310 have electrostatic interaction with the polar groups of the vertical wall 210 of the support medium 200, and the liquid crystal molecules are abnormal. Direction, that is, a direction with an abnormal refractive index, is induced to align parallel to the vertical wall 210. Therefore, the liquid crystal molecules are aligned in a direction perpendicular to the substrates 100 and 110 while being parallel to the vertical wall 210 of the support medium 300.

When the liquid crystal display of the present invention is positioned between the polarizers aligned vertically with each other, the light passing through the liquid crystal region cannot pass through the vertical polarizer because there is no phase change, and thus the light does not transmit. On the other hand, when a voltage is applied to both ends of the liquid crystal display device, the dipoles of molecules parallel to the normal axis of the liquid crystal molecules in the liquid crystal region are aligned in parallel with the direction of the electric field while the liquid crystal molecules are aligned in an abnormal direction parallel to the substrate surface. Done. That is, the liquid crystal molecules are aligned in parallel with the substrate surface, so that the light passing through the liquid crystal region is delayed in phase and can pass through the vertical polarizer, resulting in a bright state in which light is transmitted. In this principle, the grayscale from the very dark state to the very bright state can be continuously adjusted by varying the magnitude of the voltage applied to the liquid crystal molecules.

In addition, the liquid crystal display device according to the present invention has a transmittance characteristic of voltage of 25: 1 or more and very high. That is, the magnitude of the voltage required to maximize the transmittance is about 5V, which is very low. This has the advantage of simplifying the circuit required for driving to lower the manufacturing cost of the LCD driving circuit.

 On the other hand, the liquid crystal display element of this invention has the characteristic strong against external physical shock. That is, since the liquid crystal region 300 is supported in an isolated form by the support medium 200, even if an external physical shock is applied, the support medium disperses and absorbs the force, thereby not affecting the liquid crystal. In addition, since the diameter of the liquid crystal region 300 is only a few tens to thousands of micrometers in size, even if an external pressing or bending force is applied, the change in curvature of the small diameter liquid crystal region is very small so that the liquid crystal molecules are small. There is little change in the orientation of these and the resulting image is not distorted. Therefore, in the liquid crystal display of the present invention, when the substrates 100 and 110 are used as plastic substrates, the substrates 100 and 110 may be used for flexible displays.

In addition, as shown in FIG. 4, in order to reinforce the supporting force of the support medium 300, the spacer 400 may be disposed inside the support medium. The spacer 400 serves to maintain and support a gap between the pair of substrates, and shapes and manufacturing methods thereof may vary. For example, a ball-shaped spacer may be used as the spacer, may be formed of a photosensitive material using a photolithography method, or may be formed using a printing method.

Hereinafter, a method of manufacturing the liquid crystal display device of the present invention will be described with reference to FIGS. 5A-5D.

First, the first substrate 100 and the second substrate 110 are prepared, respectively. A thin film transistor, an electric field generating electrode, or a filter is formed on the first substrate 100 and the second substrate 110 as necessary. A spacer is formed between the prepared first substrate and the second substrate and bonded to each other in a state in which a gap between the first substrate and the second substrate is maintained. (See Figure 5A)

In this case, the spacer may be formed by various methods. For example, when using a ball-type spacer (ball type) as shown in Figure 5a to randomly arrange the ball-type spacer on the first substrate 100 and to bond the second substrate. Alternatively, the spacer can be formed by photolithographic methods. That is, the photosensitive material is coated on the first substrate 100, and the photosensitive material is exposed and developed to form a spacer. Another alternative is to use a printing method. That is, the UV-reactive monomolecular material is printed on the first substrate 100 and used as the spacer. The method of forming the spacer is not limited to this.

Next, a mixture 500 of a liquid crystal material having a polar group and a polymer material having a polar group is formed, and the mixture 500 is injected between the first substrate 100 and the second substrate 110. (See FIG. 5B) Alternatively, after injecting the mixture before bonding the first substrate and the second substrate, the first substrate and the second substrate may be bonded.

Next, the liquid crystal material 301 having the polar group and the polymer material 201 having the polar group are phase separated to cure the polar polymer material to form a support medium. (See FIG. 5C) The polar polymer material 301 may be photocurable or thermosetting, and as a result of the phase separation and curing treatment, a liquid crystal region 300 surrounded by the support medium 200 is formed (see FIG. 5D).

Hereinafter, an embodiment of a liquid crystal display device according to the manufacturing method of the present invention will be described.

Example 1

Merck's MLC-7026 is used as the polar liquid crystal material, and trimethylolpropane tristyol, trimethylolpropane diallyl ether, which is an ultraviolet reactive monomolecular material which can be polymerized by ultraviolet light, is used as the polar polymer material of the support medium. Isophorone diisocyanate esters were mixed at 50 wt%, 40 wt% and 10 wt%, respectively. The polar liquid crystal material to the polar polymer material were uniformly mixed in a weight ratio of 70%: 30% to form a mixture. The substrate used was an ITO substrate. The spacer was injected between a pair of substrates using a ball-shaped spacer having a diameter of 4 μm, and cured by irradiating 9.3 mW intensity ultraviolet rays for 20 minutes. The liquid crystal region was formed in a cylindrical shape having a diameter of 20 to 200 μm. The driving voltage of the thus-formed liquid crystal display device was 5V, contrast ratio 30: 1, and response time was 17.9 msec rise time and 20.5 msec fall time.

[Vertical Orientation Check]

In the liquid crystal display device manufactured according to Example 1, it can be seen in FIG. 6A that the liquid crystal molecules are oriented perpendicular to the substrate surface. In the state where the polarizing plates perpendicular to each other are arranged on the pair of substrate surfaces, the light is blocked before the voltage is applied (0V, left), and the light is transmitted when the voltage is applied (5V, right). You can see that it is white. This is the result that the liquid crystal molecules in Example 1 are aligned perpendicular to the substrate.

[Confirmation of high contrast ratio and low driving voltage]

FIG. 7 illustrates the transmittance characteristics of the liquid crystal display of Example 1 in terms of voltage, and the horizontal axis represents voltage and the vertical axis represents transmittance. In FIG. 7, the voltage required to maximize the transmittance is about 5V, which is 30V in the case of a liquid crystal display device using a conventional separate alignment layer and a 30% weight UV reactive monomolecule. Considering the degree is very low. In addition, the contrast ratio (C / R) at this time was about 30: 1 or more.

[Confirmation of Impact Stability]

 Stability against external impact of the liquid crystal display of Example 1 was tested and shown in FIG. 8. The impact stability may be represented by a change in contrast ratio with respect to a radius of curvature when the liquid crystal display is bent. 8 represents the radius of curvature at the time of bending, and the vertical axis represents the contrast ratio. The liquid crystal display of Example 1 showed a contrast ratio of 30: 1 before bending (FIG. 7), and the same 30: 1 contrast even after bending in a state having a curvature of 1 to 5 cm as shown in FIG. 8. Rain was confirmed. Therefore, it can be confirmed that the present invention can be applied to a plastic LCD product having excellent impact stability compared to the existing liquid crystal display device.

Modification 1

In Example 1, the weight ratio of the polar liquid crystal material to the polar polymer material was changed to 80:20, and the rest of the liquid crystal display device was manufactured in the same manner as in Example 1. At this time, the driving voltage was 5V, the contrast ratio 40: 1. In FIG. 6B, before the voltage is applied to the liquid crystal display device manufactured according to Modification Example 1 (0 V, left), light is cut off and the black state is applied. You can confirm that

Modification 2

In Example 1, the weight ratio of the polar liquid crystal material to the polar polymer material was changed to 60:40, and the rest of the liquid crystal display device was manufactured in the same manner as in Example 1. At this time, the driving voltage was 6V, contrast ratio 25: 1. In FIG. 6C, before the voltage is applied to the liquid crystal display device manufactured according to Modification Example 1 (0 V, left), the light is cut off and the black state is applied. You can confirm that

Modification 3

In Example 1, the weight ratio of the polar liquid crystal material to the polar polymer material was changed to 40:60, and the rest of the liquid crystal display device was manufactured in the same manner as in Example 1. In this case, the driving voltage was 7V and the contrast ratio was 22: 1.

Modification 4

In Example 1, only the space | interval between board | substrates was changed into 3 micrometers, and the liquid crystal display element was manufactured by the method similar to Example 1. At this time, the driving voltage was 4.5V and the contrast ratio was 30: 1.

Modification 5

The liquid crystal display device was manufactured in the same manner as in Example 1, changing only the intensity of ultraviolet rays irradiated in Example 1 to 13.6 mW. At this time, the driving voltage was 5V, contrast ratio 30: 1.

Modification 6

In Example 1, only the ultraviolet irradiation time was changed to 5 minutes to manufacture a liquid crystal display device in the same manner as in Example 1. At this time, the driving voltage was 5V, contrast ratio 30: 1.

Modification 7

The same method as in Example 1 was used in Example 1 except that the polar polymer material was mixed with pentaerythriol tetramercaptopropionate, hexane dithiol, and isophorone diisocyanate ester at 55 wt%, 20 wt% and 25 wt%, respectively. A liquid crystal display device was manufactured. At this time, the driving voltage was 4V, contrast ratio 30: 1.

Variant 8

A liquid crystal display device was manufactured in the same manner as in Example 1, except that the liquid crystal molecular material was replaced with ZLI-4330 in Example 1. At this time, the driving voltage was 7V, contrast ratio 30: 1.

Modification 9

In Example 1, a liquid crystal display device was manufactured by injecting a mixture before bonding the first substrate and the second substrate and then bonding the first substrate and the second substrate. That is, the liquid crystal display element was manufactured by the method similar to Example 1 except having dropped the mixture on a 1st board | substrate, and bonding and manufacturing a 2nd board | substrate. At this time, the driving voltage was 5V, contrast ratio 30: 1.

Example 2

In Example 2, a spacer was formed by a photolithography method to manufacture a liquid crystal display device. Merck's MLC-7026 is used as the polar liquid crystal material, and trimethylolpropane tristyol, trimethylolpropane diallyl ether as an ultraviolet reactive monomolecular material which can be polymerized by ultraviolet light as the polar polymer material of the support medium, and This sophorone diisocyanate ester was used in a mixture of 50 wt%, 40 wt% and 10 wt%, respectively. The polar liquid crystal material to the polar polymer material were uniformly mixed in a weight ratio of 70%: 30% to form a mixture. The substrate used was an ITO substrate.

The spacer was formed on the first substrate by photolithography using a photosensitive material. The spacers were formed in a square pillar shape having a 100 μm interval on the substrate, and after the spacer formation, the second substrate was bonded and then the mixture was injected. In this case, the driving voltage was 4V and the contrast ratio was 50: 1.

Modification 10

In Example 2, a liquid crystal display device was manufactured in the same manner as in Example 2, except that the spacer was formed in a columnar shape having a square cross section. In this case, the driving voltage was 4V and the contrast ratio was 50: 1.

Example 3

In Example 3, a spacer was formed by a printing method to manufacture a liquid crystal display device. Merck's MLC-7026 is used as the polar liquid crystal material and trimethylolpropane trithiol, trimethylolpropane diallyl ether, iso-hydrogen is a UV-reactive monomolecular material that can be polymerized by ultraviolet light as the polar polymer material of the support medium. Poron diisocyanate esters were mixed at 50 wt%, 40 wt% and 10 wt%, respectively. The polar liquid crystal material to the polar polymer material were uniformly mixed in a weight ratio of 70%: 30% to form a mixture. The substrate used was an ITO substrate.

The spacer was formed by printing an ultraviolet reactive monomolecular material (UCL-018 from DIC Corporation) on the first substrate. The spacers were formed in a cylindrical shape having a 100 μm interval on the substrate, and after the formation of the spacers, the second substrate was bonded and then the mixture was injected. The driving voltage was 4.5V and the contrast ratio was 25: 1.

Table 1 shows the contrast ratios and driving voltages of the liquid crystal display devices manufactured in the respective examples and modifications. In all embodiments, a contrast ratio of 20: 1 or more and low driving voltage of 6V or less can be confirmed.

Contrast Driving voltage Example 1 30: 1 5 V Modification 1 40: 1 5 V Modification 2 25: 1 6 V Modification 3 22: 1 7 V Modification 4 30: 1 4.5V Modification 5 30: 1 5 V Modification 6 30: 1 5 V Modification 7 30: 1 4V Variant 8 30: 1 5 V Modification 9 30: 1 5 V Example 2 50: 1 4V Modification 10 50: 1 4V Example 3 25: 1 4.5V

FIG. 9 is a graph of transmittance versus voltage which varies according to the content of the polar liquid crystal material and the polar polymer material in the embodiment of the present invention. In Fig. 9, the curve of a square is a modified example 1 (80:20), the circular curve is a first example (70:30), the triangle is a modified example 2 (60:40), and the inverted triangle is a modified example 3 (40:60), the horizontal axis represents voltage and the vertical axis represents transmittance. As can be seen in Figure 9, it can be adjusted so as to increase or decrease the change in the transmittance against voltage rapidly depending on the relative content of the polar liquid crystal material and the polar polymer material. Even if the change in the transmittance is abrupt or moderate, as can be seen in FIGS. 6A to 6C, there is no change in the vertical alignment of the liquid crystal molecules. Increasing the content of the polar polymer material leads to a steep increase in the transmittance curve, as in Modification Example 1 of FIG. 9, which can solve the problem of cross talk when driven by a passive matrix. It can be applied to electronic shelf labels, digital signage, and the like. On the contrary, when the content of the polar polymer material is reduced, the transmittance curve becomes gentle as in Modification Example 2 of FIG. 9. This characteristic shows the characteristics required when driving a thin film transistor (TFT) LCD driven by an active matrix. It can be applied to the TFT LCD product family that is currently commercially available, and it can be a suitable technology for the flexible TFT LCD product which is expected to form a large market in the future.

Although the technical features of the present invention have been described above with reference to specific embodiments, those skilled in the art to which the present invention pertains may make various changes and modifications within the scope of the technical idea according to the present invention. It is obvious.

1 is a cross-sectional view of a liquid crystal display device according to the present invention viewed from an axis parallel to the substrate.

2A to 2C are cross-sectional views illustrating the cross section of the liquid crystal region.

3 is a view for explaining the operation of the liquid crystal display device according to the present invention.

4 is a diagram illustrating a liquid crystal display device according to the present invention.

5A to 5D are views illustrating a method of manufacturing the liquid crystal display device of the present invention.

6A to 6C are photographs photographing a state in which a voltage is not applied and a state in which a voltage is applied in the liquid crystal display of Example 1, Modification 1, and Modification 2, respectively.

7 is a graph showing the transmittance with respect to the voltage of the liquid crystal display of Example 1. FIG.

8 is a graph of impact stability of the liquid crystal display of Example 1. FIG.

9 is a graph showing the transmittance according to the voltage of the liquid crystal display device of Example 1, Modification Example 1, Modification Example 2 and Modification Example 3. FIG.

Claims (13)

A pair of substrates; A support medium formed between the pair of substrates; And A plurality of liquid crystal regions formed between the pair of substrates and surrounded by the support medium; Including, The support medium is formed of a polymer material having a polar group and surrounds each liquid crystal region with a vertical wall formed in a direction perpendicular to the substrate surface , whereby the vertical wall has a predetermined polarity ; Each of the liquid crystal regions is filled with liquid crystal molecules, the liquid crystal molecules have a polar group in the normal axis direction, When no external voltage is applied, the liquid crystal molecules having polar groups in the normal axis direction are oriented in the vertical direction by forces due to spatial arrangement and electrostatic interaction with the vertical walls having the predetermined polarity. A liquid crystal display device, characterized in that. The method of claim 1, And said pair of substrates are plastic substrates. The method of claim 1, And said liquid crystal region has a columnar shape selected from the group consisting of a circle, an ellipse, and a polygon when viewed in a direction perpendicular to the substrate surface. The method of claim 3, A diameter of the cross section of the liquid crystal region as viewed in a direction perpendicular to the substrate surface is in the range of tens of micrometers to hundreds of micrometers in size. The method of claim 1, The support medium comprises a plurality of spacers for supporting between a pair of substrates. The method of claim 1, The weight ratio of the polymer material having the polar group and the liquid crystal material having the polar group is 10 to 60%: 90 to 40%, and the polymer material having the polar group includes an ultraviolet reactive single molecule. Preparing a pair of substrates; Forming a spacer between the pair of substrates; Mixing a liquid crystal material having a polar group and a polymer material having a polar group; Injecting the mixed materials between the pair of substrates; Separating the liquid crystal material having a polar group and the polymer material having a polar group from the injected material; Curing the separated polymer material to form a polymer material having a polar group to form a vertical wall having a predetermined polarity, and a liquid crystal material having a polar group surrounded by the vertical wall to form a liquid crystal region; And Aligning the liquid crystal molecules of the liquid crystal material having the polar group in a direction perpendicular to the substrate by force due to the spatially disposed interaction and the electrostatic interaction with the predetermined polarized vertical wall; Liquid crystal display device manufacturing method comprising a.  The method of claim 7, wherein The polymer material having the polar group comprises a UV-reactive monomolecular weight of 10 to 60% by weight.  The method of claim 7, wherein And said liquid crystal region is selected from the group consisting of circular, elliptical and polygonal cross sections when viewed in a direction perpendicular to the substrate surface. The method of claim 7, wherein Forming the spacer Disposing a ball spacer on one of the pair of substrates Liquid crystal display device manufacturing method comprising a. The method of claim 7, wherein The forming of the spacer may include forming a spacer by a photolithography method using a photoresist. The method of claim 7, wherein Forming the spacer Printing an ultraviolet reactive monomolecular material on one of the pair of substrates; And Curing the printed reactive monomolecular material Liquid crystal display device manufacturing method comprising a. The method of claim 7, wherein And said pair of substrates are plastic substrates.

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