JPH11281982A - Manufacture of liquid crystal element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To align or re-align liquid crystal in a desired alignment state by operating a cooling control of a substrate surface correspondingly to an alignment limiting force of the liquid crystal which each substrate surface in contact with the liquid crystal has. SOLUTION: A liquid crystal element 4 is placed on a holding member 2 in an atmosphere control tank 1. Next, the liquid crystal of the liquid crystal element 4 is heated to the transition temperature or above by a furnace and a temperature controller 3 prepared in the atmosphere control tank 1. Following this, the liquid crystal element 4 is cooled down at a specified cooling rate from the substrate side via the holding member 2 by the temperature control device 3. When the liquid crystal element is cooled down, the domain of the liquid crystal can be controlled in the size and the number by performing the cooling by adjusting the conditions like a temperature gradient, a cooling rate, etc., considering a difference in the alignment limiting force between both substrates of the liquid crystal element. Moreover, it becomes unnecessary to drastically change the cooling rate at the time of re-aligning the liquid crystal, and the conditions for the cooling rate are improved and the cooling control also becomes easier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal device for aligning and realigning liquid crystal in the liquid crystal device.

[0002]

2. Description of the Related Art In a conventional liquid crystal element, an alignment treatment such as rubbing is performed on a substrate surface to change its surface state.
The rubbing process is described in, for example, JP-A-5-3333.
No. 37 discloses a rubbing treatment using a heat treatment in combination.

In some cases, the substrate surface is subjected to a treatment different from the rubbing treatment, such as a heating treatment, a light irradiation treatment, a magnetic field treatment, an acid treatment, an alkali treatment, a resist treatment, an etching treatment, a deposit treatment, or the like. There is a treatment with gas or the like. Furthermore, when the surface state of the substrate changes during the manufacturing process of the liquid crystal element, when the surface state of the substrate changes due to the shape of the substrate surface, or when the surface of the substrate changes due to a film formed on the substrate. The surface state may change. Due to such a change in the surface state of the substrate, a difference occurs in the alignment regulating force of the liquid crystal on each substrate surface in contact with the liquid crystal, or the alignment direction is disturbed.

For this reason, simply injecting the liquid crystal into the liquid crystal element does not bring the liquid crystal into a desired alignment state, and it is necessary to perform a realignment process to change the alignment state of the liquid crystal. This reorientation process is generally performed by cooling the liquid crystal after setting the temperature to a temperature higher than its transition point temperature.

[0005]

However, in the case of the conventional rubbing treatment, the surface state of the substrate changes due to the influence of the shape, material and the like of the substrate. Moreover, since the substrate surface is rubbed with a cloth or the like during the rubbing treatment, the alignment film on the substrate surface is damaged by minute scratches. For this reason, even if the realignment treatment is performed, a difference occurs in the alignment regulating force of the liquid crystal of the alignment film due to unevenness of the substrate surface and damage to the alignment film,
There is a problem that the alignment state of the liquid crystal becomes non-uniform. Also, when a process different from the rubbing process is performed on the substrate surface, a similar problem occurs due to the disorder of the surface state of the substrate.

Therefore, in the conventional realignment treatment, it is not possible to sufficiently control the alignment state of the liquid crystal molecules. Therefore, when a uniform alignment state is required, there arises a problem that the alignment state of the liquid crystal becomes non-uniform and the display quality deteriorates. Further, when the viewing angle of the liquid crystal element is improved by providing a plurality of domains, there is a problem that the display quality changes depending on the size, the number, and the like of the domains.

Further, in the conventional reorientation treatment, an extremely high cooling rate or an extremely low cooling rate is required to eliminate the domains. However, since the cooling control is very difficult, the defective product rate is reduced significantly. A problem arises that it is not possible.

The present invention has been made to solve the above-mentioned problems of the prior art. Even when there is a difference in the alignment regulating force of the liquid crystal on each substrate surface in contact with the liquid crystal depending on the surface condition of the substrate, the liquid crystal can be oriented to a desired orientation. It is an object of the present invention to provide a method for manufacturing a liquid crystal element which can be aligned and realigned in a state.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a method of manufacturing a liquid crystal device having two substrates opposed to each other with a liquid crystal interposed therebetween, the method being adapted to the alignment control force of the liquid crystal on each substrate surface in contact with the liquid crystal. And controlling the cooling of the substrate surface to align and re-align the liquid crystal, thereby achieving the above object.

[0010] Preferably, the cooling control is performed by two opposed cooling units.
This is performed by giving a predetermined temperature difference to the surface of each substrate in the normal direction of one substrate.

The temperature difference may be defined based on the difference in the alignment control force of the liquid crystal between the surfaces of the two substrates facing each other.

Preferably, the cooling control is performed by increasing the temperature of the substrate surface on the side where the regulation of the liquid crystal alignment is weak or on the side where the alignment regulating force of the liquid crystal is weak.

Preferably, the cooling control is performed by increasing the cooling rate of the substrate surface on the side where liquid crystal alignment is strongly regulated or on the side where liquid crystal alignment regulating force is strong.

Preferably, the cooling control is performed on the side on which the liquid crystal alignment is weakly regulated or the liquid crystal alignment on the side on which the liquid crystal alignment regulating force is strong. This is performed by delaying the start time of the cooling of the substrate surface on the weak side.

The operation of the present invention will be described below.

According to the above-described manufacturing method, even when each substrate in contact with the liquid crystal has a different alignment regulating force depending on the surface state, the cooling of each substrate surface is controlled in accordance with the alignment regulating force, and the alignment of the liquid crystal is controlled. Since the liquid crystal molecules are re-aligned, the liquid crystal is brought into a desired alignment state.

When the cooling control is performed by giving a predetermined temperature difference to the surface of each substrate in the normal direction of the two substrates facing each other, the liquid crystal layer sandwiched between both substrates has the same temperature according to the temperature gradient between the two substrates. It becomes a gradient. The liquid crystal layer with the transition temperature
When cooling while maintaining this temperature gradient, the transition point temperature moves from one substrate to the liquid crystal layer and then to the other substrate, and the orientation of the liquid crystal layer changes continuously in the thickness direction. Go. For this reason, the orientation of the liquid crystal layer becomes uniform.

In the case where the cooling control is performed by increasing the temperature of the substrate surface on the side where the liquid crystal alignment is weakly controlled or on the side where the liquid crystal alignment is weak, or on the side where the liquid crystal alignment is strongly controlled or the liquid crystal alignment. In the case of increasing the cooling rate of the substrate surface on the side where the regulating force is strong, the transition point temperature moves in the order of the liquid crystal layer and the substrate on the side where the alignment regulating force is weak, from the substrate having the strong alignment regulating force. It will go. For this reason, the liquid crystal layer is first aligned in accordance with the strong alignment control force, and the alignment is successively changed in the thickness direction and gradually changes to the alignment by the weak alignment control force. Therefore, the liquid crystal layer is in a desired alignment state.

The cooling control is performed on the side where the liquid crystal alignment is weakly controlled or on the side where the liquid crystal alignment is weakly controlled, with respect to the substrate surface on the side where the liquid crystal alignment is strongly controlled or the side where the liquid crystal alignment controlling force is strong. When the start timing is delayed, the temperature of the substrate surface on the side where the alignment of the liquid crystal is weakly controlled or the side on which the alignment control force of the liquid crystal is weak increases, and the surface of each substrate is oriented in the normal direction of the two opposing substrates. Cooling can be performed with a predetermined temperature difference. Therefore, according to the temperature gradient between the two substrates, the liquid crystal layer sandwiched between the two substrates has the same temperature gradient,
While maintaining this temperature gradient, the transition point temperature moves from one substrate to the liquid crystal layer and then to the other substrate. Therefore, since the orientation of the liquid crystal layer changes continuously in the thickness direction, the orientation of the liquid crystal layer becomes uniform.

More specifically, for example, cooling is performed from the side of the substrate surface which is in contact with the liquid crystal with less unevenness or the substrate side where the alignment regulating force of the liquid crystal molecules of the alignment film is large. The opposing substrate is cooled by increasing the temperature or slowing the cooling rate. Which substrate side is cooled earlier is determined by examining the strength of the alignment regulating force. Further, the side on which the alignment of the liquid crystal is to be strongly regulated is set as the side to be cooled quickly, and if the alignment film is damaged, the substrate side where the alignment film is not damaged is cooled quickly.

With respect to the cooling rate, if the cooling is performed at a rate higher than the temperature drop rate at which the domain generation state is saturated, the size of the domain of the liquid crystal phase transition is reduced, and many domains are generated in the entire region. For this reason, when creating a uniform domain region, the occurrence of different domain regions occurring during the cooling process can be suppressed. When the cooling is performed, the size of the domain of the liquid crystal phase transition increases, and the number of generated domains decreases. For this reason, when creating a uniform domain region, domain growth in the horizontal direction is faster,
Different domain regions will be reduced or will not remain.

When the cooling rate between the two is taken, if the alignment direction of the liquid crystal is regulated, a different domain region is left in addition to the region according to the alignment direction.
When the orientation direction of the liquid crystal is not regulated, the number and size of the domains change.

When there is a difference between the alignment regulating forces of the two substrates facing each other, or when the alignment regulating force of the counterpart substrate is too strong, the temperature difference in the normal direction between the two substrates is controlled. The alignment regulating force of the substrate can be adjusted. Therefore, by giving a large alignment regulating force to the substrate to be cooled first, it is possible to more stably produce a liquid crystal element, and it is possible to repeatedly produce the liquid crystal element. In addition, the temperature difference in the normal direction reduces the influence of domain growth in the horizontal direction due to the difference in alignment control force between the two substrates. When a plurality of domains are formed, the uniformity of the orientation of the liquid crystal in the normal direction can be improved by providing the temperature difference in the normal direction. The cooling rate at this time can be reduced under the rapid cooling condition, and can be increased under the cooling-removing condition, as compared with the related art.

As described above, by adjusting the difference between the alignment regulating forces of the two substrates facing the liquid crystal molecules by controlling the temperature gradient and the cooling rate in the normal direction of the liquid crystal element, the size and the number of the domains of the liquid crystal are controlled. Can be controlled. Also,
There is no need to extremely increase or decrease the cooling rate during reorientation, and cooling control becomes easy.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a liquid crystal device according to the present invention will be specifically described with reference to FIGS. The manufacturing process of the liquid crystal element generally includes a process of aligning and realigning the liquid crystal to bring the liquid crystal into a desired alignment state.
The liquid crystal alignment and realignment steps in the present invention are performed in the atmosphere control tank 1 shown in FIG. This atmosphere control tank 1 is
The atmosphere temperature in the tank is controlled by a heating furnace or the like, and a holding member 2 on which the liquid crystal element 4 is mounted is provided inside.
And a temperature control device 3 for heating or cooling the holding member 2
The temperature of the liquid crystal element 4 placed on the holding member 2 is controlled by the temperature control device 3, a heating furnace, or the like. As shown in FIG. 2, the liquid crystal element 4 has a configuration in which a liquid crystal 5 is injected between two opposing substrates 6 and 7, and the periphery thereof is sealed with a sealing material 8.

First, the liquid crystal element 4 is placed on the holding member 2 in the atmosphere control tank 1. Next, the atmosphere control tank 1
The liquid crystal element 4 is controlled by the heating furnace and the temperature control device 3 provided in the device.
Is heated above the transition temperature. Next, the liquid crystal element 4 is cooled by the temperature controller 3 from the substrate 7 side via the holding member 2 at a predetermined cooling rate. At this time, on the side of the substrate 6 facing the liquid crystal element 4, the ambient temperature is controlled by a heating furnace or the like, or another heating member 9 as shown in FIG.
The temperature is controlled by another cooling member 10 as shown in FIG.
Thus, a predetermined temperature gradient is provided in the normal direction V of the liquid crystal element 4 shown in FIG. 2, and the liquid crystal element 4 can be cooled while maintaining this temperature gradient. In such a state, cooling is continued, and when the liquid crystal element 4 passes the transition point temperature, the liquid crystal is realigned.

At the time of performing the above-mentioned cooling, the cooling is performed by adjusting the conditions such as the temperature gradient and the cooling rate in consideration of the difference between the alignment regulating forces of the two substrates of the liquid crystal element, etc. The number of pods can be controlled, and the liquid crystal element can be brought into a desired alignment state. Moreover, there is no need to extremely increase or decrease the cooling rate when the liquid crystal is realigned, and the condition of the cooling rate is improved, and the cooling control is facilitated.

FIG. 5 shows this state. Here,
It shows the relationship between the number of domains that disturb the display in a uniform orientation and the cooling rate. That is, paying attention to the number of domains that disturb the display, the number of domains that disturb the display is greatly reduced by the present invention, as is clear from the comparison between the solid line Na representing the present invention and the broken line Nb representing the conventional technique. You can see that. Focusing on the cooling rate, when the number of domains that disturb the display is the same as that of the present invention and the related art, the value of the cooling rate becomes large in the portion where the cooling rate is extremely low, and the cooling rate is extremely large. It can be seen that the value of the cooling rate was smaller in the portion where the cooling rate was, and the condition of the cooling rate was improved. Note that the above results indicate that the size of the generated domain and the cooling rate have the relationship of the curve S shown in FIG. 6, and the number of generated domains and the cooling rate have the relationship of the curve Nc shown in FIG. It is.

Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings.

(Embodiment 1) A method of manufacturing a liquid crystal element in which a predetermined area on the surface of the liquid crystal element is selectively irradiated with light and the liquid crystal element is realigned in a liquid crystal element in which the alignment regulating force in the selected area is weakened. Show.

In the first embodiment, as shown in FIG.
After the liquid crystal 5 of the liquid crystal element 4 set in the atmosphere control tank 1 is heated to a predetermined temperature TC equal to or higher than the transition point temperature TM, the cooling rate C is increased from the time point t1 from the substrate 7 side including many non-irradiated areas.
V is set to 2 ° C./sec or more to start cooling (see solid line TB). Next, the cooling of the opposing substrate 6 is started at the same cooling rate from time t2 when the start time of the cooling is delayed by about 2 seconds (see the broken line TA). As a result, the temperature of the substrate 6 is raised by about 5 ° C. with respect to the substrate 7, and the temperature difference T between the substrate 6 and the substrate 7 is increased.
With D set at about 5 ° C. and a cooling rate CV set at 2 ° C./sec or more, the liquid crystal was re-aligned by passing the transition temperature TM of the liquid crystal. Here, the temperature difference TD was determined based on the difference in the alignment regulating force between the substrate 6 and the substrate 7 facing each other.

According to this method, it was possible to manufacture the liquid crystal element 4 in which a uniform domain was formed in a selected region or a non-selected region. According to this method, the cooling rate CV could be reduced as compared with the conventional method.

That is, in this method, the cooling control is performed with respect to the substrate surface on which the liquid crystal alignment is strongly regulated or the substrate surface on which the liquid crystal alignment regulating force is strong. The cooling start of the weak side of the
A state in which the temperature of the substrate surface on the side where the liquid crystal alignment is weakly controlled or on the side where the liquid crystal alignment control force is weak is increased, and a predetermined temperature difference is provided between the surfaces of the two substrates facing each other in the normal direction. By cooling in, according to the temperature gradient between the two substrates,
The liquid crystal layer sandwiched between both substrates has the same temperature gradient, and the transition point temperature moves from the substrate on the side with strong alignment control force to the liquid crystal layer and the substrate on the side with weak alignment control force while maintaining this temperature gradient. First, the liquid crystal layer is aligned according to a strong alignment control force, and the alignment is continuously changed in the thickness direction to an alignment according to the weak alignment control force, so that the liquid crystal layer has a desired alignment state. It is to become.

(Embodiment 2) Due to the difference between the alignment control forces of the two substrates facing each other of the liquid crystal element, a region other than the expected domain is generated due to the partial influence of the substrate having the strong alignment control force. A method of manufacturing a liquid crystal element for performing liquid crystal reorientation on a liquid crystal element with reduced display quality will be described.

In the second embodiment, as shown in FIG.
After the liquid crystal 5 of the liquid crystal element 4 set in the atmosphere control tank 1 is heated to a predetermined temperature TC equal to or higher than the transition point temperature TM, the cooling rate CV is set to 2 ° C./sec from the time point t3 from the substrate 7 having a weak alignment control force. The cooling is started as described above (see the solid line TB).
Next, the cooling of the opposing substrate 6 is started at the same cooling rate CV from the time t4 when the start time of the cooling is delayed by about 2 seconds (see the broken line TA). Thereby, the temperature of the substrate 6 is
, The temperature difference TD between the substrate 6 and the substrate 7 is set within 5 ° C., and the cooling rate CV is set to 2 ° C./sec or more. To realign the liquid crystal. Here, the temperature difference TD was determined based on the difference in the alignment control force of the liquid crystal between the opposing substrates 6 and 7.

According to this method, a uniform domain can be generated under the control of the substrate 7 having a weak liquid crystal alignment regulating force. Note that the delay time Δt, which is the difference between t3 and t4, is set to 0.
, The substrate 6 having a strong alignment regulating force
Aside from the expected domain, an area other than the expected domain occurred.

That is, in this method, when the alignment regulating force of the partner substrate side is too strong, in order not to be affected by the influence, the substrate side for which the alignment regulation is to be prioritized is cooled first, and the substrate side is cooled. Adjust the difference between the alignment control forces of both substrates so as to have a large alignment control force to prevent the occurrence of regions other than the expected domains due to the influence of the substrate side with the strong alignment control force. Things.

(Embodiment 3) A method of manufacturing a liquid crystal element in which a uniform domain is formed using a ferroelectric liquid crystal or an antiferroelectric liquid crystal and the liquid crystal is realigned will be described.

In the third embodiment, as shown in FIG.
After the liquid crystal 5 of the liquid crystal element 4 set in the atmosphere control tank 1 is heated to a predetermined temperature TC equal to or higher than the transition point temperature TM, the cooling rate CV is set to 1 ° C./min from time t5 from the substrate 7 having the strong alignment control force. The cooling is started as follows (see the solid line TB).
Next, the cooling of the opposing substrate 6 is started at the same cooling rate CV from the time t6 when the start time of the cooling is delayed by about 2 seconds (see the broken line TA). Thereby, the temperature of the substrate 6 is
And the temperature difference TD between the substrate 6 and the substrate 7
Was set to 7 ° C. or more and the cooling rate CV was set to 1 ° C./min or less, and the liquid crystal was realigned by passing the transition point temperature TM of the liquid crystal. Here, this temperature difference TD is determined by
And the orientation regulating force of the substrate 7. With this method, the cooling rate CV could be increased as compared with the conventional method.

That is, in this method, the size of the domain of the liquid crystal phase transition is increased by performing slow cooling at a sufficiently low cooling rate so that the generation of the domain is saturated. Is reduced, and the domain growth in the horizontal direction is made faster, so that different domain regions are reduced or do not remain, thereby creating a uniform domain region.

(Embodiment 4) A method of manufacturing a liquid crystal element in which a plurality of domains are minutely and numerously generated without actively performing an alignment process will be described.

In the fourth embodiment, as shown in FIG.
After heating the liquid crystal 5 of the liquid crystal element 4 set in the atmosphere control tank 1 to a predetermined temperature TC equal to or higher than the transition point temperature TM, the cooling rate CV is set to 5 ° C./sec or more from the substrate 7 side at time t7 to perform rapid cooling. Start (see solid line TB). Next, rapid cooling of the opposing substrate 6 is started at the same cooling rate CV from time t8 when the start time of cooling is delayed by 2 seconds or more (see the broken line TA). As a result, the temperature of the substrate 6 is raised by 5 ° C. or more with respect to the substrate 7, the temperature difference TD between the substrate 6 and the substrate 7 is set to 5 ° C. or more, and the cooling rate CV is set to 5 ° C./sec or more. The liquid crystal was realigned by passing through the transition point temperature TM. Here, the temperature difference TD was determined based on the difference in the alignment regulating force between the substrate 6 and the substrate 7 facing each other. With this method, the cooling rate CV could be reduced as compared with the conventional method.

In other words, according to this method, the size of the domain of the liquid crystal phase transition is reduced by performing rapid cooling at a cooling rate equal to or higher than the temperature drop rate at which the domain generation state saturates, and many domains are generated in the entire region. In this way, the generation of different domain regions generated in the cooling process is suppressed, and a uniform domain region is created.

In each of the above embodiments, the case where the cooling rates CV of the two opposing substrates are the same is shown. However, if the temperature difference TD satisfies the above-mentioned predetermined condition, the cooling rates of the respective substrates are reduced. It can be different.

In each of the above embodiments, it is very important that the cooling control is performed by giving a predetermined temperature difference to the surface of each substrate in the normal direction of the two substrates facing each other. The reason is that the temperature gradient between the two substrates causes the liquid crystal layer sandwiched between the two substrates to have the same temperature gradient, and the liquid crystal layer having a transition point temperature or higher is cooled while maintaining this temperature gradient. This is because the transition point temperature moves in the order of the liquid crystal layer and the other substrate, so that the orientation of the liquid crystal layer continuously changes in the thickness direction, so that the orientation of the liquid crystal layer becomes uniform. .

In addition, in order to make the orientation of the liquid crystal layer uniform,
The temperature distribution state when the temperature gradient is provided in the liquid crystal layer is also relevant. FIG. 10 shows the temperature distribution state of the upper and lower substrate surfaces and the liquid crystal in the liquid crystal element. In the temperature distribution states indicated by reference numerals a, b, and c in the figure, the temperature of the liquid crystal layer is distributed between the temperatures of the upper and lower substrate surfaces, and in this case, the orientation of the liquid crystal layer is uniform. . On the other hand, in the temperature distribution states indicated by reference signs d and e, the temperature of the liquid crystal layer may be higher or lower than the temperatures of the upper and lower substrate surfaces. The orientation becomes non-uniform. Therefore, it is preferable to provide a temperature gradient to the liquid crystal element in a temperature distribution state indicated by reference numerals a, b, and c where the orientation of the liquid crystal layer is uniform.

[0047]

According to the method for manufacturing a liquid crystal element of the present invention, the difference between the alignment regulating forces of the liquid crystal molecules on the opposing substrates due to the surface condition of the substrate is determined by the temperature gradient in the normal direction of the liquid crystal element. And by controlling the cooling rate,
Since the size and number of domains of the liquid crystal can be controlled, the liquid crystal can be brought into a desired alignment state.

In addition, there is no need to extremely increase or decrease the cooling rate when the liquid crystal is realigned, and the cooling control is facilitated. be able to.

[Brief description of the drawings]

FIG. 1 is a view showing an apparatus for aligning and re-aligning a liquid crystal according to a method for manufacturing a liquid crystal element of the present invention.

FIG. 2 is a diagram showing a structure of a liquid crystal element for performing alignment and realignment of liquid crystal by a method of manufacturing a liquid crystal element of the present invention, and showing a normal direction V thereof.

FIG. 3 is a view showing a case where another heating member is used in an apparatus for aligning and realigning liquid crystal by the method for manufacturing a liquid crystal element of the present invention.

FIG. 4 is a diagram showing a case where another cooling member is used in an apparatus for aligning and realigning liquid crystal by the method for manufacturing a liquid crystal element of the present invention.

FIG. 5 is a graph showing the relationship between the number of domains that disturb the generated display and the cooling rate.

FIG. 6 is a graph showing a relationship between a size of a generated domain and a cooling rate.

FIG. 7 is a graph showing a relationship between the number of generated domains and a cooling rate.

FIG. 8 shows alignment of liquid crystal in Embodiments 1 to 3,
4 is a graph illustrating a cooling control process for performing reorientation.

FIG. 9 is a graph showing a cooling control process for aligning and re-aligning the liquid crystal in the fourth embodiment.

FIG. 10 is a graph showing a temperature distribution state when a temperature gradient is provided in an upper substrate, a liquid crystal layer, and a lower substrate of a liquid crystal element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Atmosphere control tank 2 Holding member 3 Temperature controller 4 Liquid crystal element 5 Liquid crystal 6, 7 Substrate 8 Sealing material 9 Another heating member 10 Another cooling member

Claims (5)

[Claims] 1. A method for manufacturing a liquid crystal device having two substrates opposed to each other with a liquid crystal interposed therebetween, the method comprising controlling cooling of the substrate surface in accordance with the alignment regulating force of the liquid crystal on each substrate surface in contact with the liquid crystal. And a method of manufacturing a liquid crystal element including a step of performing liquid crystal alignment and realignment. 2. The method for manufacturing a liquid crystal element according to claim 1, wherein the cooling control is performed by giving a predetermined temperature difference to each substrate surface in a normal direction of two opposing substrates. 3. The liquid crystal device according to claim 1, wherein the cooling control is performed by increasing the temperature of the substrate surface on the side where the alignment control of the liquid crystal is weakly performed or on the side where the alignment control force of the liquid crystal is weak. Production method. 4. The cooling control according to claim 1, wherein the cooling control is performed by increasing the cooling rate of the substrate surface on the side where the alignment of the liquid crystal is strongly regulated or on the side where the alignment regulating force of the liquid crystal is strong. The manufacturing method of the liquid crystal element of the description. 5. The liquid crystal device according to claim 1, wherein the cooling control is performed on a side on which the liquid crystal alignment is strongly regulated or on a side on which the liquid crystal alignment regulating force is strong. The method for manufacturing a liquid crystal element according to claim 1, wherein the start timing of cooling the substrate surface on the side is delayed.