JPH11264978A - Manufacture of liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve display quality and productivity of a large-screen and a fine-definition liquid crystal display element by preventing the array and orientation of liquid crystal molecules of a liquid crystal composition part of the liquid crystal display element from becoming uneven due to the rubbing unevenness of an orientation film. SOLUTION: After an array substrate 12 or an opposite substrate 13 is coated with an orientation films 17, 23, 1st and 2nd heating means 28a and 28b heat them providing with a temperature gradient and a drying device 31 which forms an air flow on the surface of the orientation films 17, 23 in the same direction with the temperature gradient by an air blower 32 gradually dries the orientation films 17, 23 in the temperature gradient direction. Consequently, the molecule chains of the orientation films 17, 23 are arrayed in the temperature gradient direction by convection generated in the orientation films 17, 23 and the air flow on the surface of the orientation films 17, 23 to provide orientation restricting force for orientation the liquid crystal molecules of a liquid crystal composition 16 to the orientation films 17, 23 themselves and thus, an orientation defect is compensated in spite of variation of rubbing conditions to prevent a display defect caused by the orientation result of a TFT-LCD 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and, more particularly, to a method for manufacturing a liquid crystal display device capable of satisfactorily aligning an alignment film.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device (hereinafter abbreviated as LCD) uniformly aligns liquid crystal molecules and uniformly aligns the liquid crystal molecules in an arbitrary direction to improve the uniformity of the image quality on the display surface and the improvement of the image quality. As a result, good display quality is maintained.

Conventionally, among methods of aligning liquid crystal molecules in an arbitrary direction, as a method suitable for mass production, industrially, an alignment film such as polyimide is formed on the surface of an LCD substrate having electrodes. Is generally practiced by mechanically rubbing with a rubbing material made of fiber.

In this rubbing method, for example, the number of rotations of a rubbing material wound around a roller on a cylinder, the rubbing material, and the like are controlled so as to more uniformly control the alignment state of liquid crystal molecules without impairing mass production of LCDs. The rubbing alignment processing conditions such as the relative speed with respect to the LCD substrate or the optimal condition of the rubbing pressure, which is the pressing of the rubbing material on the LCD substrate, have been managed and controlled.

On the other hand, in recent years, in LCDs, the display has been made more uniform with the increase in the screen size and the definition, and in order to realize this uniform display, the alignment state of the alignment film has been required to be uniform. It had been.

[0006]

However, in the rubbing method, for example, the rubbing pressure is determined by the distance between the rubbing material and the LCD substrate, and the distance between the rubbing material and the LCD substrate is determined by the rubbing cloth. It depends on the thickness, the thickness of the adhesive used when attaching the rubbing cloth to the rubbing roller, etc., the mounting error that occurs when attaching the roller around which the rubbing material is wound to the rubbing orientation processing device, etc. There has been a problem that it is a difficult task at present because it is necessary to enter the manufacturing process of the rubbing cloth and the adhesive.

[0007] In addition, the mounting error that occurs when the rubbing roller is mounted on the rubbing alignment processing device can be reduced by improving the mounting method and the like, but there is a limit, and it is necessary to mount the rubbing roller on the rubbing alignment processing device with high accuracy. Even if possible, rubbing material and LCD due to rotation unevenness and vibration generated when rotating the rubbing roller
Strictly controlling the distance from the substrate has a problem in that there is a limit in terms of mechanical accuracy.

In addition, the distance between the rubbing material and the LCD substrate fluctuates due to fluctuations in the thickness of the LCD substrate, and it is difficult to maintain and maintain a distance suitable for the alignment processing conditions in the rubbing method. The rubbing orientation tends to be non-uniform, and the direction of the bristles of the rubbing cloth is disordered during the rubbing orientation treatment. The unevenness of the threshold voltage of the LCD due to the non-uniformity causes the problem that the alignment of the liquid crystal molecules becomes non-uniform and the image quality of the LCD deteriorates. At the time of mass production, fluctuations in the thickness of the LCD substrate directly cause fluctuations in the quality of mass-produced products, causing a problem of lowering the yield due to the occurrence of defective display due to uneven rubbing amount. In the large-sized TFT-LCD described above, the unevenness of the rubbing amount appears more remarkably as a display defect due to the further improvement of the contrast, and the liquid crystal molecules form a pretilt structure by the rubbing alignment treatment. In addition, uneven rubbing also causes defects in the reptilt structure, which also appears as display defects, which lowers the image quality and further lowers the yield.

Further, the unevenness of the rubbing amount generated during the production of the LCD substrate cannot be evaluated as is with the LCD substrate immediately after the alignment process, and after the alignment process, a cell is formed and a liquid crystal composition encapsulated is completed. Since it is discovered after the product is manufactured, there is a problem in that a considerable waste is caused in the manufacturing time and the manufacturing cost, and the cost is increased.

In view of the above, the present invention has been made to solve the above-mentioned problem.
Even if the thickness of the substrate is not uniform, the rubbing direction and the rubbing amount can be made uniform by promoting a stable alignment process, and a display defect caused by a rubbing defect does not occur. It is an object of the present invention to provide a method for manufacturing a liquid crystal display element which can obtain display quality and has a high production yield.

[0011]

According to the present invention, as a means for solving the above problems, a pair of electrode substrates each having an electrode and an alignment film on an insulating substrate are opposed to each other with a predetermined gap therebetween. In the method for manufacturing a liquid crystal display element comprising a liquid crystal composition sealed in the gap, a step of applying the alignment film after forming the electrode on the insulating substrate, and heating the applied alignment film in a predetermined direction. And heating with a gradient.

According to the present invention, the alignment film is dried by providing a temperature gradient in the same direction as the alignment direction so that the molecular chains constituting the alignment film are oriented in the alignment direction in the alignment film during drying. By giving the alignment regulating force to the liquid crystal molecules, the liquid crystal molecules are uniformly and well aligned even if the subsequent rubbing treatment conditions are slightly changed, and the display quality is good without causing the display failure due to the alignment failure. The object is to obtain a liquid crystal display element having a high production yield.

According to the present invention, as a means for solving the above problems, a pair of electrode substrates each having an electrode and an alignment film on an insulating substrate are opposed to each other with a predetermined gap therebetween, and a liquid crystal composition is provided in the gap. A method of manufacturing the liquid crystal display element by enclosing the object, after forming the electrodes on the insulating substrate, applying the alignment film, and heating the applied alignment film by providing a temperature gradient in a predetermined direction. And generating a gas flow in the predetermined direction on the surface of the alignment film.

According to the present invention, the alignment film is provided with a temperature gradient in the same direction as the alignment direction and dried by an airflow in the same direction as the alignment direction. Even if the rubbing conditions are slightly changed, the liquid crystal molecules are uniformly and satisfactorily aligned even if the subsequent rubbing treatment conditions are slightly changed. It is intended to obtain a good liquid crystal display element with a high production yield.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the principle of the present invention will be described. Generally, an organic linear polymer is used as an alignment film material used for a large-sized TFT-LCD. Then, as a mechanism for generating pretilt in this organic linear polymer, a side chain for generating pretilt is formed in a branch from the main chain forming the molecule, and the side chain is formed with respect to the main chain to generate pretilt. And has a polarity-sensitive group capable of transferring electrons such as electron withdrawing and donating.

Generally, the polarity-sensitive group has hydrophobicity or hydrophilicity. When a temperature gradient is applied to the LCD substrate in the same direction as the rubbing direction with respect to the LCD substrate before the drying after forming the alignment film, the alignment film has a high temperature portion. Convection from the bottom to the lower part, aligning hydrophilic groups if hydrophilic and hydrophobic groups if hydrophobic. When an airflow is further applied in the same direction as the rubbing direction during this convection, the polarity-sensitive group in the alignment film comes into contact with the air and, if the polarity-sensitive group is hydrophilic, the hydrophilic group becomes hydrophobic in the alignment material, that is, in the direction of the alignment film. If so, the hydrophobic groups are aligned toward the surface of the alignment film. That is, the organic polymer forming the alignment film takes a form having a pretilt in the rubbing direction. Therefore, before the rubbing alignment treatment, the alignment film has the ability to align the liquid crystal molecules in the rubbing direction. In addition, it has been confirmed that the structure of the molecules in such an alignment film does not collapse even if the conventional alignment film is fired.

The treatment at the time of drying is not a mechanical treatment such as a rubbing treatment but a treatment for giving a direction to the molecular structure of an organic polymer material as an alignment film material. It is more stable than a simple alignment treatment. Therefore, the alignment film on the LCD substrate that has been treated to give directionality to the molecular structure at the time of drying can perform stable alignment of liquid crystal molecules. Further, by performing the rubbing treatment, a uniform and stable alignment state can be obtained regardless of the fluctuation of the rubbing condition. The unevenness of the rubbing due to the unevenness of the rubbing conditions caused by the conventional rubbing processing apparatus and the LCD substrate can be compensated by the alignment state held by the alignment film, and the uneven alignment state and the pretilt can be compensated. Can be prevented.

Next, the present invention will be described based on the above principle with reference to the first embodiment shown in FIGS. FIG.
FIG. 1 is a schematic cross-sectional view showing a TFT-LCD 10, in which an array substrate 12 using a TFT 11 as a driving element and an opposing substrate 13 are opposed to each other with a spacer 14 interposed therebetween, and a liquid crystal is inserted into a gap formed by bonding the periphery with a sealant 15. The composition 16 is enclosed.

Here, the array substrate 12 is a glass substrate 17
A pixel electrode 18 which is driven by the TFT 11 and is made of indium tin oxide (hereinafter abbreviated as ITO), is patterned in a matrix, and has an alignment film 2 thereon.
0 is formed. On the other hand, the counter substrate 13 has a color filter 24 and a counter electrode 22 made of ITO on a glass substrate 21, and an alignment film 23 is formed thereon.

In the TFT-LCD 10, after the array substrate 12 and the counter substrate 13 are formed, an alignment film 2 made of a polyimide polymer which is soluble in a solvent is formed on each of the opposing surfaces.
After the films 0 and 23 are formed, they are dried, and the alignment films 20 and 23 are further rubbed. After that, the substrates 12 and 13 are opposed to each other via a spacer, and the sealant 15 is fixed to form a liquid crystal cell. Becomes The polyimide-based polymer constituting the alignment films 20 and 23 is CH3 for generating pretilt.
And the like are incorporated into the molecular chain. Since the alkyl group such as CH3 itself shows hydrophobicity, the hydrophilic group present in the polyimide molecule under the airflow in the same direction as the rubbing direction is directed macroscopically into the alignment film layer. take. Therefore, an alkyl group such as CH3 that generates pretilt has a structure in which the alkyl group such as CH3 is arranged on the alignment film surface layer along the airflow in the same direction as the rubbing direction.

Next, drying of the alignment films 20 and 23 will be described in detail. FIG. 2 is a schematic explanatory view of a drying device 26 for drying the alignment films 20 and 23 applied to the array substrate 12 and the counter substrate 13 while preliminarily aligning them.
Glass substrate 17, 2 of stage 27 on which 7, 21 are placed
A first heating unit 28a and a second heating unit 28b that are set to a temperature of 85 ° C. are provided at positions corresponding to the two sides of 1.

In the case of the array substrate 12, the color filter 24 and the counter electrode 22 on the glass substrate 21 are laminated on the TFT 11 and the pixel electrode 18 on the glass substrate 17, and on the counter substrate 13, On top, alignment film 2
After applying 0 and 23 by printing or the like, respectively, to a thickness of 1000 μm, the substrates are placed on a stage 27 of a drying device 26 and heated from two sides of the glass substrates 17 and 21 so that the alignment films 20 and 23 have arrows. Heat drying is performed while maintaining the temperature gradient in the s direction.

Immediately after coating, the alignment films 20 and 23 are in a wet state because the solvent and the like remain, and when the solvent is evaporated and dried from this state, the first and second heating means 28a and 28a are used. By heating by providing a temperature gradient in the direction of arrow r by 28b, macroscopic convection is generated inside the alignment films 20 and 23, and this convection affects the molecular chains of polyimide and the like constituting the alignment films 20 and 23. Then, while aligning the molecular chains in the convection direction, the alignment films 20 and 23 are gradually dried in the temperature gradient direction to form a structure in which the molecular chains are aligned in the direction of the arrow r which is the convection direction on the alignment film surface layer. .

After drying, the alignment films 20 and 23 are rubbed by a rubbing roller (not shown) around which a rubbing cloth is wound in the direction of the arrow r which is the same direction as the temperature gradient direction. During this rubbing, the tip of the rubbing cloth is disturbed or the mechanical accuracy of the rubbing roller fluctuates.
Regardless of the rubbing conditions such as the thickness of the counter substrate 13 or the thickness of the opposing substrate 13, the molecular chains of the alignment films 20 and 23 have directivity before rubbing, and the rubbing direction is uneven and the rubbing amount is uneven. And the alignment films 20 and 23 are sufficiently and uniformly aligned. Thereafter, a sealant 15 is provided around the array substrate 12.
After printing and applying spacers 14 on the opposing substrate 13, the array substrate 12 and the opposing substrate 13 are arranged to face each other,
The sealing agent 15 is cured by heating to form a cell, and the liquid crystal composition 16 is sealed in the gap to complete the TFT-LCD 10.

The TFT-LCD 10 thus configured is:
Since the alignment films 20 and 23 are sufficiently and uniformly rubbed, there is no defect in the alignment and alignment of the liquid crystal molecules of the liquid crystal composition 16, there is no threshold unevenness, and a large screen and high definition are obtained. A high display quality can be obtained, and a decrease in yield due to poor display due to poor alignment can be prevented, and a liquid crystal display device with high productivity can be obtained.

Next, the present invention will be described with reference to a second embodiment shown in FIGS. This embodiment is different from the first embodiment in the method of drying the alignment film in the first embodiment, but is otherwise the same as the first embodiment. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted. . In the present embodiment, when the alignment films 20 and 23 are dried, the array substrate 12 and the counter substrate 13 are dried by heating while providing a temperature gradient, and airflow is generated on the surfaces of the alignment films 20 and 23 in the same direction as the temperature gradient. Is formed and dried.

That is, the drying device 31 of the present embodiment forms an air flow at a flow rate of about 20 to 30 liters per minute using nitrogen (N) together with the first and second heating means 28a and 28b on the stage 27. Then, while blowing air at an angle of about 45 ° from a height of 5 to 7 mm above the stage 27, the stage 2
7 and a blower 32 that scans and moves in the diagonal direction of the alignment substrate 20.
3 is dried while being oriented by a heating temperature gradient and an air flow.

Therefore, when the solvent is evaporated and dried, the orientation films 20 and 23 applied to the surface of the array substrate 12 and the counter substrate 13 are heated by the temperature gradient in the direction of arrow s and the airflow formed in the same direction. When macroscopic convection is generated inside the alignment films 20 and 23, the surfaces of the alignment films 20 and 23 are further brought into contact with an airflow, thereby affecting the molecular chains of polyimide and the like constituting the alignment films 20 and 23, Chain to the alignment film 20,
The alignment films 20, 23 are gradually dried in the direction of the temperature gradient while being aligned in the same direction by the convection inside 23 and the airflow on the surfaces of the alignment films 20, 23, and the arrow s indicates that the molecular chains are in the convection direction.
A structure is formed that is aligned with the alignment film surface layer along the direction.

After the drying, the alignment films 20, 23 are rubbed in the direction of the arrow s, which is the same direction as the temperature gradient direction and the air flow direction. Since the molecular chains have directionality and compensate for unevenness in the rubbing direction and uneven rubbing amount, the alignment films 20 and 23 are sufficiently and uniformly aligned as in the first embodiment. Thereafter, similarly to the first embodiment, the TFT-LCD 10 is completed by using the array substrate 12 and the counter substrate 13 having the alignment films 20 and 23 that are sufficiently and uniformly aligned.

The TFT-LCD 10 thus constructed is
As in the first embodiment, since the alignment films 20 and 23 are sufficiently and uniformly rubbed, a good alignment of liquid crystal molecules can be obtained, and a large screen and high definition can be obtained. Good display quality can be obtained without causing display defects, a decrease in yield can be prevented, and productivity can be improved.

Next, the present invention will be described with reference to a third embodiment shown in FIGS. This embodiment is different from the first embodiment in the method of drying the alignment film in the first embodiment, but is otherwise the same as the first embodiment. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted. . In the present embodiment, when the alignment films 20 and 23 are dried, the array substrate 12 and the counter substrate 13 are uniformly heated and dried, and an airflow in a predetermined direction is formed on the surfaces of the alignment films 20 and 23 to be dried. Things.

That is, the drying device 33 of the present embodiment has the third flat heating means 36 for uniformly heating the array substrate 12 and the counter substrate 13 on the stage 34,
An airflow at a flow rate of about 20 to 30 liters per minute is formed using nitrogen (N), and scanning movement is performed in the diagonal direction of the stage 34 while blowing the airflow at an angle of about 45 ° from a height of 5 to 7 mm above the stage 34. Array substrate 1
And drying the alignment films 20 and 23 applied to the counter substrate 13 while uniformly heating them and orienting them in the airflow direction.
Is carried out.

Thus, immediately after coating the alignment films 20 and 23,
When the glass substrates 17 and 21 are placed on the stage 34, the glass substrates 17 and 21 are uniformly heated from the bottom surface and gradually dried. During this time, the surfaces of the alignment films 20 and 23 are in contact with the airflow, , 23 are affected by this, the molecular chains are gradually dried while aligning the molecular chains in the airflow direction, and the molecular chains are arranged in the alignment film surface layer along the arrow t direction which is the airflow direction. To form

After this drying, the alignment films 20, 23 are rubbed in the direction of the arrow t, which is the same direction as the airflow direction.
The molecular chains of No. 3 have directionality and compensate for non-uniform rubbing directions and non-uniform rubbing amounts, and the alignment films 20 and 23 are sufficiently and uniformly aligned as in the first embodiment. Thereafter, similarly to the first embodiment, the array substrate 12 and the counter substrate 13 having the alignment films 20 and 23 which are sufficiently and uniformly aligned.
To complete the TFT-LCD 10.

The TFT-LCD 10 thus configured is:
As in the first embodiment, since the alignment films 20 and 23 are sufficiently and uniformly rubbed, a good alignment of liquid crystal molecules can be obtained, and a large screen and high definition can be obtained. Good display quality can be obtained without causing display defects, a decrease in yield can be prevented, and productivity can be improved.

Next, the present invention will be described with reference to a fourth embodiment shown in FIGS. This embodiment is different from the third embodiment in that one of the array substrate 12 and the opposing substrate is used.
A region corresponding to a pixel is divided, and the alignment film 2 is controlled while controlling the direction of the molecular chain in the alignment films 20 and 23 for each of the divided regions.
0 and 23 are dried. FIG. 7 shows a TFT-L
FIG. 2 is a schematic cross-sectional view showing a CD 38, wherein an array substrate 40
A pixel electrode 43 made of ITO, which is driven by a TFT 42 and is patterned in a matrix, is provided on a glass substrate 41, and an alignment film 44 made of a polyimide-based polymer is formed thereon.
Are formed. On the other hand, the opposite substrate 46 is a glass substrate 4
7, a color filter 48, a counter electrode 5 made of ITO
Further, an alignment film 51 made of a polyimide-based polymer is formed on top of the stacked layers. A liquid crystal composition 54 is sealed in a gap between the array substrate 40 and the counter substrate 46 which are disposed opposite to each other via the spacer 52 and fixed to the sealant 53.

On the other hand, a drying device 56 for drying the alignment films 44 and 51 on the array substrate 40 and the opposing substrate 46 is provided with a fourth infrared ray for uniformly heating the array substrate 12 and the opposing substrate 13 on the stage 57. In addition to the heating means 58, the stage 5 forms an airflow at a flow rate of about 20 to 30 liters per minute using nitrogen (N), and blows the airflow at an angle of about 45 ° from a height of 5 to 7 mm above the stage 57.
7, an air blower 60 that scans and moves in two diagonal directions, and an alignment film 44 applied to the array substrate 40 and the counter substrate 46.
The drying is performed while uniformly orienting 51 in the airflow direction while heating it uniformly.

When the alignment films 44 and 51 are dried, the fourth heating means 58 uses the metal thin film 61 corresponding to the area size divided between the fourth heating means 58 and the glass substrates 41 and 47. The molecular chains in the alignment films 44 and 51 are arranged in the airflow direction for each of the divided regions with a mask 62 formed so as to transmit the heat.

That is, immediately after coating the alignment films 44 and 51,
The glass substrates 41 and 47 are placed on the stage 5 via the mask 62.
7, the heat for drying the alignment films 44 and 51 is uniformly transmitted only to the region [A] shown in FIG.
Is scanned in the direction of arrow u so that the molecular chains of polyimide or the like constituting the alignment films 44 and 51 are in the direction of air flow u.
It is aligned with the alignment film surface layer along the direction. Next, the mask 62 on the stage 57 is slid in the direction of the arrow v, and FIG.
By blowing the blower 60 in the direction of arrow w while uniformly heating and drying the remaining [B] regions of the alignment films 44 and 51 shown in FIG. Are aligned with the alignment film surface layer along the direction of the arrow w.

Accordingly, after that, the [A] and [B] regions of the alignment films 44 and 51 are alternately masked, and the respective regions are moved in the direction of arrow v by a rubbing roller (not shown) around which a rubbing cloth is wound. And a rubbing operation in the direction of arrow w to obtain the orientation as shown in FIG. At the time of this rubbing, even if the rubbing conditions are changed, the [A] region and the [B] region each have a directional molecular chain before the rubbing, so that the rubbing direction and the rubbing amount are not uniform. In addition, the alignment films 44 and 51 are sufficiently and uniformly aligned in each rubbing direction. The TFT-LCD 38 using the array substrate 40 having the alignment films 44 and 51 and the counter substrate 46.
To form

The TFT-LCD 38 thus constructed is:
Since the alignment films 44 and 51 are sufficiently and uniformly rubbed, there is no defect in the alignment and alignment of the liquid crystal molecules of the liquid crystal composition 54, there is no threshold unevenness, and a large screen and high definition can be obtained. A high display quality can be obtained, and a decrease in yield due to poor display due to poor alignment can be prevented, and a liquid crystal display device with high productivity can be obtained. Moreover, one pixel is divided into the [A] region and the [B] region, and each is divided by an arrow u
Since the liquid crystal molecules are oriented in two directions, that is, the direction of the arrow w and the direction of the arrow w, the viewing angle dependency can be improved in a large-screen, full-color TFT-LCD 38, and a display image with high definition and good contrast can be obtained, thereby improving the display quality. .

The present invention is not limited to the above-described embodiment, but can be changed without departing from the spirit of the present invention. For example, the heating temperature at the time of drying the alignment film and the gas for generating an air flow may be used. The flow rate and the like are arbitrary depending on the material or thickness of the alignment film, and the same effect can be obtained by using a thermosetting polyimide as the material of the alignment film. Further, the structure of the device for generating a temperature gradient in the alignment film during drying is also arbitrary. For example, as in a first modification shown in FIG. 13, a fifth heating device 64 which generates heat uniformly over the entire surface.
Are provided with a first support 66 and a second support 67 having different heights, and the electrode layer 6 is interposed via the first and second support 66, 67.
By heating the glass substrate 71 having the alignment film 8 and the alignment film 70, the alignment film 70 may be heated with a temperature gradient.

Further, in the fourth embodiment, when far infrared rays are used as a heat source, masking is performed with a mask formed of a metal thin film that absorbs far infrared rays, and the alignment film is divided and dried. The regions are brought into contact with airflows of different directions, and the molecular chains of the liquid crystal molecules of the liquid crystal composition sealed in the LCD are subjected to alignment treatment without rubbing only by drying while aligning the molecular chains in the respective airflow directions. Orientation in a predetermined direction is also possible. In this way, when dividing a pixel and orienting one pixel in a plurality of directions in order to enlarge the viewing angle of the LCD, the divided pixel region is selectively masked by photolithography as in the conventional case. However, it is not necessary to perform the rubbing process a plurality of times, and the operation of the alignment process can be significantly simplified, the cost can be reduced, and the manufacturing accuracy in the alignment process can be improved, and the yield can be improved.

[0044]

As described above, according to the present invention, the alignment film is controlled before the rubbing alignment treatment by controlling the molecular chains in the alignment film in the alignment direction during the drying after the formation of the alignment film. Thus, the ability to align the liquid crystal molecules in the liquid crystal composition in the rubbing direction is maintained. Therefore, even when the rubbing conditions of the rubbing device are changed, it is possible to compensate for the non-uniformity of the rubbing and to perform stable alignment of the liquid crystal molecules on the alignment film. Further, by performing the rubbing treatment, a uniform and stable alignment state can be obtained, and the alignment of the liquid crystal molecules of the LCD,
It is possible to easily manufacture an LCD having a large screen, a high definition, a high definition, and a wide viewing angle without generating defects in alignment and having no display defects. Further, by preventing display defects caused by defective orientation, it is possible to prevent a decrease in yield and improve productivity.

[Brief description of the drawings]

FIG. 1 shows a TFT-L according to a first embodiment of the present invention.
FIG. 3 is a schematic sectional view showing a CD.

FIG. 2 is a schematic explanatory view showing a drying device according to the first embodiment of the present invention.

FIG. 3 is a schematic explanatory view showing a drying device according to a second embodiment of the present invention.

FIG. 4 is a schematic explanatory view of a drying apparatus according to a second embodiment of the present invention as viewed from a side.

FIG. 5 is a schematic explanatory view showing a drying device according to a third embodiment of the present invention.

FIG. 6 is a schematic explanatory view of a drying device according to a third embodiment of the present invention as viewed from a side.

FIG. 7 shows a TFT-L according to a fourth embodiment of the present invention.
FIG. 3 is a schematic sectional view showing a CD.

FIG. 8 is a schematic explanatory view showing a drying device according to a fourth embodiment of the present invention.

FIG. 9 is a schematic explanatory diagram illustrating a drying apparatus according to a fourth embodiment of the present invention.

FIG. 10 is a schematic explanatory view showing drying of an area [A] according to a fourth embodiment of the present invention.

FIG. 11 is a schematic explanatory view showing drying of a region [B] according to a fourth embodiment of the present invention.

FIG. 12 is a schematic explanatory view showing an alignment state of an alignment film according to a fourth embodiment of the present invention.

FIG. 13 is a schematic explanatory view showing a drying device according to a first modification of the present invention.

[Explanation of symbols]

 Reference Signs List 10 TFT-LCD 11 TFT 12 Array substrate 13 Counter substrate 16 Liquid crystal composition 17 Glass substrate 18 Pixel electrode 20 Alignment film 21 Glass substrate 22 Counter electrode 23 Alignment film 26 Drying device 27 ... Stage 28a ... First heating means 28b ... Second heating means 31 ... Drying device 32 ... Blower

Claims (5)

[Claims] 1. A method for manufacturing a liquid crystal display device, comprising: a pair of electrode substrates each having an electrode and an alignment film on an insulating substrate facing each other with a predetermined gap therebetween, and enclosing a liquid crystal composition in the gap. A liquid crystal comprising: a step of applying the alignment film after forming the electrode on the insulating substrate; and a step of heating the applied alignment film by providing a temperature gradient in a predetermined direction. A method for manufacturing a display element. 2. A method for manufacturing a liquid crystal display device, comprising: a pair of electrode substrates each having an electrode and an alignment film on an insulating substrate facing each other with a predetermined gap therebetween, and enclosing a liquid crystal composition in the gap. And after forming the electrode on the insulating substrate, applying the alignment film, and heating the applied alignment film and generating an airflow in a predetermined direction on the alignment film surface. A method for manufacturing a liquid crystal display element, comprising: 3. A method for manufacturing a liquid crystal display device, comprising: a pair of electrode substrates each having an electrode and an alignment film on an insulating substrate facing each other with a predetermined gap therebetween, and sealing a liquid crystal composition in the gap. In the above, after forming the electrode on the insulating substrate, applying the alignment film, providing a temperature gradient in a predetermined direction and heating the applied alignment film in the predetermined direction on the alignment film surface A method for producing an air flow. 4. A pair of electrode substrates each having an electrode and an alignment film on an insulating substrate are opposed to each other with a predetermined gap therebetween, a liquid crystal composition is sealed in the gap, and a plurality of pixels in a matrix are formed. In the method for manufacturing a liquid crystal display element having the above, after forming the electrodes on the insulating substrate, applying the alignment film, and dividing one pixel of the pixel electrode into a plurality of regions, Heating the alignment film each time, and generating an airflow in a predetermined direction on the divided surfaces of the alignment film that are heated. 5. A pair of electrode substrates each having an electrode and an alignment film on an insulating substrate are opposed to each other with a predetermined gap therebetween, a liquid crystal composition is sealed in the gap, and a plurality of pixels in a matrix are formed. In the method for manufacturing a liquid crystal display element having the above, after forming the electrode on the insulating substrate, applying the alignment film, and dividing one pixel of the pixel electrode into a plurality of regions, Generating an airflow in a predetermined direction on the surface of the divided alignment film heated while heating the alignment film every time; and heating the alignment film in the predetermined direction for each of the divided alignment films after heating. And a step of subjecting the liquid crystal display device to an alignment treatment.