JP2008191579A - Liquid crystal cell, method for manufacturing liquid crystal cell, liquid crystal display device, and method for manufacturing liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal cell capable of suppressing the generation of bubbles by suppressing the generation of a region in which no liquid crystal exists in the liquid crystal cell during the injection of the liquid crystal, a method for manufacturing the liquid crystal cell, and a liquid crystal A display device and a method for manufacturing a liquid crystal display device are provided.
A pair of substrates, a seal member provided between the pair of substrates, a liquid crystal injected into a space formed by the pair of substrates and the seal member, and penetrating the seal member. and a liquid crystal inlet provided Te, the atmospheric pressure P _1, and the surface tension sigma, and the contact angle theta, the maximum length L of the flow front, the width dimension w of the inlet, inlet There is provided a liquid crystal cell characterized in that the height direction dimension hp satisfies the following relationship. w · hp> (2Lσ · F · cos θ) / P ₁ where factor F ≧ 0.15.
[Selection] Figure 1

Description

  The present invention relates to a liquid crystal cell, a method for manufacturing a liquid crystal cell, a liquid crystal display device, and a method for manufacturing a liquid crystal display device.

Liquid crystal display devices are used in various home appliances and information terminal devices such as televisions, personal computers and mobile phones. The liquid crystal cell used in this liquid crystal display device is bonded together with a pair of substrates made of glass or the like facing each other, and after injecting liquid crystal into the space formed therein from the injection port, the injection port is UV curable. It is manufactured by sealing with a sealing material made of resin, thermosetting resin or the like.
As for the liquid crystal injection, for example, a vacuum injection method is known. In this vacuum injection method, a liquid crystal cell provided with an injection port and a liquid crystal storage member storing liquid crystal are set in a depressurizable container, and the liquid crystal cell injection port is placed in the liquid crystal storage member in a state where the pressure in the container is reduced. After that, the inside of the container is returned to atmospheric pressure, and the liquid crystal is injected into the liquid crystal cell by a difference in pressure between the inside and outside of the liquid crystal cell.

  Here, when the liquid crystal is injected, if the injection is not performed promptly, bubbles may be generated in the display area of the liquid crystal cell. If such bubbles are generated, the display quality of the liquid crystal display device is adversely affected. It will be. For this reason, there has been proposed a technique for suppressing the remaining bubbles in the liquid crystal cell by promptly injecting liquid crystal (see Patent Document 1).

However, the technique disclosed in Patent Document 1 considers the relationship between the width dimension of the inlet, the dimension from the inlet to the farthest position in the liquid crystal cell, and the dimension of the buffer seal. It is intended to suppress the remaining bubbles inside. For this reason, the dimensions and position of the injection port, the surface tension at the flow front at the time of liquid crystal injection (flow front), the contact angle, etc. are not considered, and there is a problem in suppressing the generation of bubbles in the liquid crystal cell. .
JP-A-5-127180

  The present invention relates to a liquid crystal cell capable of suppressing the generation of bubbles by suppressing the generation of a region in which no liquid crystal exists in the liquid crystal cell during the injection of the liquid crystal, a method for manufacturing the liquid crystal cell, a liquid crystal display device, And a method of manufacturing a liquid crystal display device.

According to one aspect of the present invention, a pair of substrates, a seal member provided between the pair of substrates, a liquid crystal injected into a space formed by the pair of substrates and the seal member, comprising a liquid crystal inlet provided through the sealing member, and the atmospheric pressure P _1, the surface tension and sigma, the contact angle theta, the width dimension of the maximum length L and the inlet of the flow front There is provided a liquid crystal cell characterized in that w and the height dimension hp of the inlet satisfy the following relationship. w · hp> (2Lσ · F · cos θ) / P ₁ where factor F ≧ 0.15.

  According to another aspect of the present invention, the method includes injecting liquid crystal into a space formed by a pair of substrates and a seal member provided between the pair of substrates, the injection pressure Production of a liquid crystal cell characterized in that the force F1 received by the liquid crystal and the force F2 received by the liquid crystal due to the surface tension when the length of the flow front reaches the maximum satisfy the following relationship: A method is provided. F1 / F2> F Here, the factor F ≧ 0.15.

According to another aspect of the present invention, the method includes a step of injecting liquid crystal into a space formed by a pair of substrates and a seal member provided between the pair of substrates. ₁ , the surface tension σ, the contact angle θ, the maximum length L of the flow front, the width direction dimension w of the injection port, and the height direction dimension hp of the injection port satisfy the following relationship: A method for producing a liquid crystal cell is provided. w · hp> (2Lσ · F · cos θ) / P ₁ where factor F ≧ 0.15.

According to another aspect of the present invention, there is provided a liquid crystal display device including the above-described liquid crystal cell.
Furthermore, according to another aspect of the present invention, a liquid crystal cell is manufactured by the method for manufacturing a liquid crystal cell, and a liquid crystal display device is manufactured by mounting a mechanism member on the liquid crystal cell. A method for manufacturing a liquid crystal display device is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal cell which can suppress generation | occurrence | production of a bubble by suppressing that the area | region where a liquid crystal does not exist generate | occur | produces in a liquid crystal cell at the time of injection | pouring of a liquid crystal, the manufacturing method of a liquid crystal cell, and a liquid crystal display An apparatus and a method for manufacturing a liquid crystal display device are provided.

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

FIG. 1 is a schematic diagram for explaining a liquid crystal cell according to an embodiment of the present invention.
As shown in FIG. 1, the liquid crystal cell 1 has a side 1a and a side 1b substantially perpendicular to the side 1a, and the planar shape thereof is substantially rectangular. The dimension of the side 1a is a, and the dimension of the side 1b is b. Further, on the side 1a, the center of the liquid crystal injection port 2 is provided at a position of a dimension c from the end surface, the width direction size of the injection port 2 is w, and the height direction size of the injection port 2 (not shown) (on the paper surface of FIG. 1). The vertical dimension) is hp.

Here, when the liquid crystal 3 is injected from the injection port 2 at the injection pressure P ₁ (atmospheric pressure in the case of the above-described vacuum injection method), for example, a region where the liquid crystal 3 does not exist is generated in the portion indicated by A in the figure. There is a case. When such a region where the liquid crystal 3 does not exist is generated, bubbles are formed by discharging the gas dissolved in the liquid crystal 3 in this portion, and the bubbles finally remain in the liquid crystal cell 1. May end up. Incidentally, P ₂ in the figure, a pressure due to the surface tension, which will be described later.

According to the knowledge obtained by the present inventors, the generation of the region where the liquid crystal 3 does not exist is caused by the force received by the liquid crystal 3 due to the injection pressure P ₁ and the force received by the liquid crystal 3 due to the surface tension at the flow front (flow front) 4. This can be explained by the balance.
In other words, towards the force which the liquid crystal 3 is subjected by the surface tension, if the injection pressure P ₁ is greater than the force which the liquid crystal 3 is subjected, the flow rate of the liquid crystal 3 is pulled flow front (flow front) 4 side by the surface tension inlet It becomes faster than the flow velocity near 2. As a result, since the flow front (flow front) 4 side tends to flow faster, a region where the liquid crystal 3 does not exist is generated as the liquid crystal 3 is torn off. Since the region where the liquid crystal 3 generated in this way does not exist has a negative pressure, the gas dissolved in the liquid crystal is likely to be discharged, and there is a high risk that it will eventually remain as bubbles.

The present inventor's study results, it forces the liquid crystal 3 is subjected by the injection pressure P ₁ is, if it is possible to obtain the larger such conditions than the force which the liquid crystal 3 is subjected by the surface tension, the areas where the liquid crystal 3 is not present It has been found that generation can be suppressed and, in turn, generation and remaining of bubbles can be suppressed.

Here, when the force F ₁ received by the liquid crystal 3 by the injection pressure P ₁ is obtained, the following equation (1) is obtained.

F ₁ = P ₁ · w · hp (1)
Incidentally, P ₁ is the injection pressure, w is the width dimension of the inlet 2, hp is the height dimension of the inlet 2 (vertical dimension in the plane of FIG. 1).

Next, a force F ₂ received by the liquid crystal 3 due to the surface tension is obtained.
Here, FIG. 2 is a schematic diagram for explaining the surface tension at the flow front (flow front) 4. 2 is a schematic enlarged view of a cross section taken along line XX of FIG.
As can be seen from Figure 2, the pressure P ₂ by the surface tension can be obtained by the following equation (2).

P ₂ = (2σ · cos θ) / hc (2)
Here, σ is the surface tension, θ is the contact angle, and hc is the cell gap.

Therefore, the force F ₂ received by the liquid crystal 3 due to the surface tension when the length of the flow front (flow front) 4 becomes maximum is expressed by the following equation (3).

F ₂ = P ₂ · L · hc = 2Lσ · cos θ (3)

Here, L is the maximum length of the flow front (flow front) 4.

Next, the maximum length L of the flow front (flow front) 4 will be described.
3 to 5 are schematic diagrams for explaining the maximum length L of the flow front (flow front).
As can be seen from these figures, when the injection progresses and the flow front (flow front) 4 reaches the side 1c opposite to the side 1a where the injection port 2 is provided, the length of the flow front (flow front) 4 is longer. The maximum length is L. Therefore, the area of the flow front 4 portion at this time is also maximized, and the force applied to the liquid crystal 3 by the surface tension is also maximized.

Here, the maximum length L of the flow front (flow front) 4 can be obtained by the following equation (4).

L = b (φ1 + φ2) (4)

Here, b is the length of the side 1b substantially perpendicular to the side 1a where the injection port 2 is provided, φ is the intersection of the flow front 4 and the side of the liquid crystal cell, and the center of the injection port 2 The connecting line is an angle that passes through the center of the injection port 2 and is perpendicular to the side 1a of the liquid crystal cell. Then, φ1 appears on the right side of the line perpendicular to the side 1a of the liquid crystal cell through the center of the inlet 2, and φ2 appears on the left side.
However, the maximum length L of the flow front (flow front) varies depending on the dimensions a and b of the liquid crystal cell 1 and the position (dimension c) of the injection port 2. In the following, explanation will be made by dividing into cases.

FIG. 3 illustrates the case of a-c>b> c. In this case, as can be seen from FIG. 3, φ1 = sin ⁻¹ (c / b) and φ2 = π / 2.
FIG. 4 illustrates the case where a−c ≧ c> b. In this case, as can be seen from FIG. 4, φ1 = π / 2 and φ2 = π / 2.
FIG. 5 illustrates the case of b> ac−c. In this case, as can be seen from FIG. 5, φ1 = sin ⁻¹ (c / b) and φ2 = sin ⁻¹ ((ac) / b).

From the above, in order to suppress the occurrence of a region where the liquid crystal 3 does not exist, the force F ₁ received by the liquid crystal 3 due to the injection pressure P ₁ is greater than the force F ₂ received by the liquid crystal 3 due to surface tension. Therefore, the conditions should be such that F ₁ / F ₂ > 1.

However, as a result of further studies by the present inventor, it has been found that even when F ₁ / F ₂ is smaller than 1, the generation of a region where the liquid crystal 3 does not exist can be suppressed.
Therefore, the present inventor made F ₁ / F ₂ a factor F, and as a result of further examination, as a result of F ≧ 0.15, the present inventor has found that the generation of a region where the liquid crystal 3 does not exist can be suppressed.
Table 1 below is a table for explaining the results of experiments conducted by the inventor in the course of studying factor F.


Sample No. in Table 1 As can be seen from FIG. 2, a region F in which the liquid crystal 3 does not exist when the factor F is set to 0.14 by reducing the force F ₁ applied to the liquid crystal 3 by the injection pressure P ₁ by reducing the width dimension w of the injection port 2. There has occurred. In contrast, sample no. As can be seen from FIG. 1, when the factor F was set to 0.15, no generation of the liquid crystal 3 was observed. In this case, the surface tension σ was 0.028 N / m, and the contact angle θ was 5 °.

From the above, the condition for suppressing the occurrence of the region where the liquid crystal 3 does not exist is F ₁ / F ₂ > F, and the following equation (5) is derived from this and equations (1) and (3).

w · hp> (2Lσ · F · cos θ) / P ₁ (5)
At this time, F ≧ 0.15.

Here, when determining the dimension of each part of a liquid crystal cell using this condition, various applications can be considered.
For example, in the case where the dimension (w, hp) regarding the inlet 2 on the left side of the equation (5) is fixed to a predetermined value by standardization or the like, the values of other parameters can be examined ( 5) The condition of the formula can be satisfied.
For example, when examining the maximum length L of the flow front 4 (flow front), the dimensions a and b of the liquid crystal cell 1 are often determined to some extent by the product. The position (dimension c) of the inlet 2 should be examined. However, when the dimension a and the dimension b can be changed, these values may be considered.
Further, since the surface tension σ is influenced by the physical properties of the liquid crystal 3, the value of the surface tension σ can be changed if the type of the liquid crystal 3 is changed. Further, since the contact angle θ is affected by the surface properties of the counterpart member with which the liquid crystal 3 comes into contact, the value of the contact angle θ may change if the counterpart member changes. However, these values can be obtained in advance by experiments or the like.
In the vacuum injection method, the injection pressure P ₁ is to the atmospheric pressure is generally the liquid crystal cell according to the present embodiment is not limited thereto, by using a differential pressure injection It can be widely applied to what performs.

Also, factor F is the injection pressure P ₁ and the force F ₁ to the liquid crystal 3 is subjected, determined depending on a relationship between the force F ₂ that the liquid crystal 3 is subjected by the surface tension, the less influence from other parameters. Therefore, a value satisfying F ≧ 0.15 can be appropriately selected in consideration of production efficiency and yield.

  Further, in the case where the parameter on the right side of equation (5) is fixed to a predetermined value by standardization or the like, the conditions of equation (5) can be obtained by examining the dimensions (w, hp) relating to the inlet 2. Can be satisfied.

  Further, for the sake of convenience, the expression (5) takes a form that prescribes the conditions of the dimensions (w, hp) related to the injection port 2, but it may be modified to a form that prescribes the condition of the parameter to be examined. .

6 and 7 are schematic graphs for explaining the simulation result under the condition of the expression (5).
The conditions of the simulation, the injection pressure _{P 1} was 0.1 MPa, the surface tension sigma 10 mN / m, the contact angle θ with 5 °. Further, the dimension a of the liquid crystal cell 1 was 29 cm, the dimension b was 18 cm, the dimension c at the inlet was 8 cm, and hc was 5.2 μm. In this case, the maximum length L of the flow front (flow front) 4 is 36 cm. The factor F was set to 1.
Under such conditions, when the height dimension hp of the injection port 2 is 5.2 μm, the width direction dimension w of the injection port 2 that satisfies the expression (5) is 1.4 cm or more.

FIG. 6 shows a case where the width direction dimension w of the injection port 2 is 1 cm.
As can be seen from FIG. 6A, when the dimension of the flow front (flow front) 4 is maximized, an area where the liquid crystal 3 does not exist is generated in the vicinity of the flow front (flow front) 4.
FIG. 6B is an enlarged view of a region where the liquid crystal 3 does not exist.
As shown in FIG. 6B, it can be seen that the inside of the region where the liquid crystal 3 does not exist is a negative pressure. Therefore, when such a region is generated, bubbles are likely to be formed, and there is a high possibility that the bubbles will remain finally.

FIG. 7 shows the case where the width direction dimension w of the inlet 2 is 3 cm.
As can be seen from FIG. 7, if the width direction dimension w of the injection port 2 that satisfies the expression (5) is selected, generation of a region where the liquid crystal 3 does not exist can be suppressed.
Table 2 exemplifies dimensions of each part of the liquid crystal cell that satisfies the expression (5).
By examining each condition described on the left side of Table 2, it was confirmed that the condition shown in the equation (5) can be satisfied and generation of a region where the liquid crystal 3 does not exist can be suppressed. In this case, the surface tension σ was 0.028 N / m, and the contact angle θ was 5 °.


Here, the cross-sectional configuration of the liquid crystal cell 1 according to the present embodiment will be described.
FIG. 8 is a schematic diagram for explaining a cross-sectional configuration of the liquid crystal cell according to the present embodiment.
As shown in FIG. 8, an alignment film 12 is formed on a glass substrate 11 (counter substrate) provided in the liquid crystal cell 1. A sealing member 13 made of a sealing agent or the like is provided along the outer peripheral edge of the glass substrate 11. At this time, the seal member 13 is not provided in a portion where a liquid crystal injection port (not shown) is formed. And the dimension of the inlet part which is not shown in figure is made into the dimension which satisfies (5) Formula.

A glass substrate 14 (array substrate) is provided so as to face the glass substrate 11. A display electrode 15 is formed on the glass substrate 14, and an alignment film 16 is formed on the display electrode 15. The glass substrates 11 and 13 are arranged to face each other via the spacer beads 17. After injecting the liquid crystal 3 from an injection port (not shown), the injection port is sealed with a sealing material made of an ultraviolet curable resin or a thermosetting resin. In addition, a color filter or the like can be provided as appropriate.
For convenience of explanation, the dimensions of the inlet portion are described as conditions for satisfying the expression (5). However, as described above, the expression (5) may be satisfied under other conditions. . In addition, about the effect | action of liquid crystal cell 1 itself, since a known technique can be applied, the description is abbreviate | omitted.

  As described above, according to the liquid crystal cell 1 according to the present embodiment, generation of a region where the liquid crystal 3 does not exist can be suppressed, and as a result, generation of bubbles in the liquid crystal cell 1 and its residual can be suppressed. Can do.

Next, a method for manufacturing the liquid crystal cell 1 according to the present embodiment will be described.
For convenience of explanation, a manufacturing process of a TFT (Thin Film Transistor) color liquid crystal display device will be described.
The manufacture of TFT (Thin Film Transistor) color liquid crystal display devices can be broadly divided into the manufacture of liquid crystal cells and the assembly of liquid crystal display devices.

First, manufacture of the liquid crystal cell 1 will be described.
The manufacturing process of the liquid crystal cell 1 includes a TFT array forming process, a color filter forming process, an alignment film forming process, a substrate bonding process, a liquid crystal injection process, and a substrate cutting process.

  First, in the TFT array forming step, an array substrate is formed by forming a pixel array having a plurality of pixels on the surface of a glass substrate made of clean alkali-free glass. The pixels constituting this pixel array have a TFT transistor, a display electrode, and a storage capacitor, and can be formed using a lithography technique. Note that a known technique can be applied to the formation of the TFT transistor, the display electrode, the storage capacitor, and the description thereof is omitted.

  Next, in the color filter forming step, a color filter is formed on the surface of the glass substrate (counter substrate) that forms a pair with the glass substrate on which the above-described pixels are formed. The color filter forming method includes a printing method, an electrodeposition method, a patterning method, and the like. However, since known techniques can be applied to these methods, description thereof is omitted.

  Next, in the alignment film forming step, a polyimide film is laminated on the above-described pixels and color filters using a CVD (Chemical Vapor Deposition) method, and the polyimide film is oriented in a predetermined direction using a rubbing roller or the like. To form an alignment film. In addition, about the technique used for thin film formation, rubbing, etc., since a known technique can be applied, the description is abbreviate | omitted.

Next, in the substrate bonding step, a sealing agent is applied on the alignment film, and the glass on which the pixels are formed and the glass substrate on which the color filters are formed are bonded to each other. At this time, the alignment films are bonded so that the alignment directions are parallel to form a normally white. Further, the sealing agent is not applied to the portion where the liquid crystal injection port is formed. And the dimension of an inlet part shall be a dimension which satisfies (5) Formula. When this sealing agent is cured, the above-described sealing member is obtained. For convenience of explanation, the dimensions of the inlet portion are described as conditions for satisfying the expression (5). However, as described above, the expression (5) may be satisfied under other conditions. .
Since a known technique can be applied to the sealant application technique itself used for bonding the substrates, the description thereof will be omitted.

Next, in the liquid crystal injection step, liquid crystal is injected from the injection port into the gap between the two glass substrates formed in the above-described substrate bonding step. The liquid crystal injection method includes a vacuum injection method and the like, but since a known technique can be applied, description thereof is omitted.
After the injection, the injection port is sealed with a sealing material made of an ultraviolet curable resin or a thermosetting resin.

  Through the above steps, an assembly of the liquid crystal cell 1 in which the pixels and the color filter face each other with the liquid crystal interposed therebetween is formed.

Next, in the substrate cutting step, first, the assembly of the liquid crystal cells 1 is cut along the planned cutting line using a laser cutting method. Then, it breaks by carrying out break processing of the aggregate | assembly of the cut liquid crystal cell 1. FIG. In addition, since a known technique can be applied to the laser cleaving method and the break processing, the description thereof is omitted.
This completes the production of the liquid crystal cell.
According to the manufacturing method of the liquid crystal cell 1 according to the present embodiment, it is possible to suppress the generation of a region where the liquid crystal 3 does not exist, and consequently to suppress the generation of bubbles and the residual thereof in the liquid crystal cell 1. Therefore, a yield and productivity can be improved, and a liquid crystal cell with excellent display quality can be obtained.

Next, a mechanism member is attached to the liquid crystal cell 1 for assembling the liquid crystal display device. Examples of the mechanism member include a driver IC, a drive circuit that generates a control signal input to the driver IC, and a backlight.
This completes the manufacture of the liquid crystal display device.
In addition, since a known technique can be applied to the configuration and operation of the liquid crystal display device other than the liquid crystal cell according to the present embodiment, the description thereof is omitted.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples.

As for the above-described specific examples, those skilled in the art appropriately modified the design are included in the scope of the present invention as long as they have the characteristics of the present invention.
For example, the shape, dimensions, material, arrangement, and the like of the liquid crystal cell 1 are not limited to those illustrated, but can be changed as appropriate.

Further, for convenience of explanation, the substrate used in the liquid crystal cell 1 is a glass substrate, but is not limited thereto, and may be a substrate made of a transparent body (for example, a transparent resin substrate).
Moreover, each element with which each specific example mentioned above is provided can be combined as much as possible, and what combined these is also included in the scope of the present invention as long as the gist of the present invention is included.

It is a schematic diagram for demonstrating the liquid crystal cell which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the surface tension in the flow front (flow front). It is a schematic diagram for demonstrating the maximum length of the flow front (flow front). It is a schematic diagram for demonstrating the maximum length of the flow front (flow front). It is a schematic diagram for demonstrating the maximum length of the flow front (flow front). It is a schematic graph for demonstrating the result of simulation. It is a schematic graph for demonstrating the result of simulation. It is a schematic diagram for demonstrating the cross-sectional structure of the liquid crystal cell which concerns on this Embodiment.

Explanation of symbols

1 liquid crystal cell, 1a side, 1b side, 1c side, 2 inlet, 3 liquid crystal, 4 flow front (flow front), a side 1a dimension, b side 1b dimension, c end face dimension, hc cell gap, L maximum length of the flow front (flow front), P ₁ injection pressure, the pressure by P ₂ tension, sigma tension, theta contact angle

Claims (7)

A pair of substrates;
A seal member provided between the pair of substrates;
Liquid crystal injected into a space formed by the pair of substrates and the sealing member;
The liquid crystal injection port provided through the sealing member;
With
And the atmospheric pressure P _1, and the surface tension sigma, and the contact angle theta, the maximum length L of the flow front, the width dimension w of the inlet, the height dimension hp inlet, but the following relation A liquid crystal cell characterized by satisfaction.
w · hp> (2Lσ · F · cos θ) / P ₁
Here, the factor F ≧ 0.15. 2. The liquid crystal cell according to claim 1, wherein the maximum length L of the flow tip satisfies the following relationship.
L = b (φ1 + φ2)
Here, b is the length of the side substantially perpendicular to the side of the liquid crystal cell provided with the injection port. Also, if a is the length of the side of the liquid crystal cell provided with the injection port and c is the dimension from the end face of the liquid crystal cell to the center of the injection port, φ1 and φ2 are expressed by the following equations.
If a−c>b> c, φ1 = sin ⁻¹ (c / b), φ2 = π / 2,
When a−c ≧ c> b, φ1 = π / 2, φ2 = π / 2,
When b> ac−c, φ1 = sin ⁻¹ (c / b) and φ2 = sin ⁻¹ ((ac) / b). A step of injecting liquid crystal into a space formed by the pair of substrates and a seal member provided between the pair of substrates;
A liquid crystal characterized in that the force F1 received by the liquid crystal due to the injection pressure and the force F2 received by the liquid crystal due to the surface tension when the length of the flow front reaches the maximum satisfy the relationship of the following expression: Cell manufacturing method.
F1 / F2> F
Here, the factor F ≧ 0.15. A step of injecting liquid crystal into a space formed by the pair of substrates and a seal member provided between the pair of substrates;
The injection pressure P _1, and the surface tension sigma, and the contact angle theta, the maximum length L of the flow front, the width dimension w of the inlet, the height dimension hp inlet, but the following relation A method for producing a liquid crystal cell, characterized by satisfying.
w · hp> (2Lσ · F · cos θ) / P ₁
Here, the factor F ≧ 0.15. The method for manufacturing a liquid crystal cell according to claim 4, wherein the maximum length L of the flow tip satisfies the following relationship.
L = b (φ1 + φ2)
Here, b is the length of the side substantially perpendicular to the side of the liquid crystal cell provided with the injection port. Also, if a is the length of the side of the liquid crystal cell provided with the injection port and c is the dimension from the end face of the liquid crystal cell to the center of the injection port, φ1 and φ2 are expressed by the following equations.
If a−c>b> c, φ1 = sin ⁻¹ (c / b), φ2 = π / 2,
When a−c ≧ c> b, φ1 = π / 2, φ2 = π / 2,
When b> ac−c, φ1 = sin ⁻¹ (c / b) and φ2 = sin ⁻¹ ((ac) / b).   A liquid crystal display device comprising the liquid crystal cell according to claim 1.   A liquid crystal cell is manufactured by the method for manufacturing a liquid crystal cell according to any one of claims 3 to 5, and a liquid crystal display device is manufactured by mounting a mechanism member on the liquid crystal cell. Manufacturing method.