JP3412493B2 - Manufacturing method of liquid crystal display device and liquid crystal injection device - Google Patents

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 display device and a liquid crystal injection device. More specifically, the present invention relates to a technique for injecting liquid crystal into a gap between a first substrate and a second substrate that form a liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display panel 1 shown in FIG. 11 has a first transparent substrate 10 made of transparent glass and a second transparent substrate 2 made of the same transparent glass.
It has 0 and. A sealant 30 is formed on one of these transparent substrates, and the first transparent substrate 10 and the second transparent substrate 20 are bonded and fixed with the sealant 30 sandwiched therebetween. In the gap 31 between the first transparent substrate 10 and the second transparent substrate 20, the liquid crystal is filled in the liquid crystal filling region 300 defined by the sealant 30. The cell gap is defined by the spacer 32 interposed between the first transparent substrate 10 and the second transparent substrate 20. On the inner surface of the first transparent substrate 10, an ITO film (Indium T
in oxide), a plurality of laterally extending stripe-shaped electrodes 105 are formed, and the second transparent substrate 20 is formed.
A plurality of striped electrodes 205 extending in the vertical direction are formed on the inner surface of the ITO film. A pixel is formed at each intersection of these stripe electrodes 105 and 205. The alignment films 101 and 201 are formed on the inner surfaces of the first transparent substrate 10 and the second transparent substrate 20.
Are formed.

Polarizing plates 102 and 202 are attached to the outer surfaces of the first transparent substrate 10 and the second transparent substrate 20, respectively. When the liquid crystal display panel 1 is configured as the reflection type liquid crystal display panel 1, the reflection plate 203 is attached to the polarizing plate 202 attached to the second transparent substrate 20.

In the method of manufacturing the liquid crystal display panel 1 as described above, when injecting the liquid crystal LC into the gap 31 between the first transparent substrate 10 and the second transparent substrate 20, FIG.
As shown in (A) and (B), a part of the sealant 30 is interrupted as a liquid crystal injection port 301, and the inside region of the sealant 30 from this liquid crystal injection port 301 (the liquid crystal sealing region 3).
Liquid crystal LC is injected into 00). For example, the panel 10 in which the first transparent substrate 10 and the second transparent substrate 20 are bonded together
When the liquid crystal injection port 301 of No. 0 is immersed in the liquid crystal LC in the container 41 in a vacuum atmosphere and the vacuum is released in this state, the liquid crystal LC is sucked from the liquid crystal injection port 301 into the gap 31 as indicated by arrow A. And then injected. After that, the liquid crystal inlet 301 is sealed with a sealant (not shown) made of an ultraviolet curable resin.

In such a liquid crystal injection process, conventionally, when a predetermined time elapses after the injection of the liquid crystal LC is started, it is considered that the liquid crystal LC has been injected into the gap 31 without excess or deficiency, and the injection work is terminated. There is.

[0006]

However, as the size of the liquid crystal display panel 1 becomes larger, the time required to inject the liquid crystal LC into the gap 31 tends to vary. With the method of ending the injection work only by managing the time from the start, there is a possibility that insufficient injection of the liquid crystal LC frequently occurs. If such an injection is insufficient, a negative pressure is generated in the gap 31 and bubbles (impact bubbles) are generated when a shock is applied to the liquid crystal display panel 1, which deteriorates the display quality of the liquid crystal display panel 1. However, if the injection time is set too long, the productivity will decrease accordingly.

Further, as shown in FIG. 1, in the liquid crystal display panel 1, as the first transparent substrate 10 and the second transparent substrate 20, a transparent transparent plastic film is used instead of the glass substrate. Then, when the gap 31 becomes a negative pressure due to insufficient injection of the liquid crystal LC, impact bubbles are generated, and as shown in FIG.
There is also a problem that the center of the transparent substrate 10 and the second transparent substrate 20 is dented, and the display quality is significantly deteriorated. In addition, when pressure is used to inject the liquid crystal LC, the liquid crystal LC
13B, there is also a problem in that the center of the first transparent substrate 10 and the second transparent substrate 20 swells and the display quality is remarkably deteriorated, as shown in FIG. 13B. .

In view of the above problems, the object of the present invention is to:
It is an object of the present invention to provide a method for manufacturing a liquid crystal display device in which the injection amount of liquid crystal is not excessive or insufficient by directly monitoring the injection state of liquid crystal into the gap, and a liquid crystal injection device used therefor.

[0009]

In order to solve the above problems, in the present invention, a liquid crystal for injecting a liquid crystal into the gap between a first substrate and a second substrate bonded together with a predetermined gap. In the method of manufacturing a liquid crystal display device having an injection step, in the liquid crystal injection step, the light transmittance is monitored at a predetermined position in a region of the gap where the liquid crystal is injected, and based on the timing when the light transmittance changes. Then, the injection of the liquid crystal into the region is finished.

In the present invention, when the injection of the liquid crystal progresses to the position where the light transmittance is monitored, the light transmittance changes abruptly, so that the injection state of the liquid crystal into the gap can be directly monitored. Therefore, the liquid crystal injection process can be completed at the optimum timing. Therefore, even if the size of the liquid crystal display panel is increased, the injection amount of the liquid crystal can be properly managed, and the liquid crystal injection is not insufficient. Therefore, since the injection process does not end even though the pressure in the gap is still negative, the problem that impact bubbles are generated can be avoided. Further, even when pressure is applied when injecting the liquid crystal, excessive injection does not occur. Therefore, it is possible to prevent color unevenness and reduction in response speed due to excessive liquid crystal injection amount. Moreover, since the wasteful injection time can be reduced, the productivity is improved.

In the present invention, as the first substrate and the second substrate, transparent substrates such as glass are generally used.

The present invention is suitable for manufacturing a plastic film liquid crystal display panel in which both the base material of the first substrate and the base material of the second substrate are made of a transparent transparent plastic film. ing. According to the present invention, since the liquid crystal injection amount is neither excessive nor insufficient, it is possible to prevent deformation of the plastic film liquid crystal panel due to such excessive or insufficient amount. Therefore, it is more effective when the present invention is applied to the manufacturing process of the plastic film liquid crystal display panel.

In the present invention, the light transmittance is monitored by
For example, a light source disposed on one surface side of a panel in which the first substrate and the second substrate are bonded, and a light receiving element disposed on the other surface side so as to receive light emitted from the light source. With the element.

In the present invention, the light transmittance is monitored by
A light source and a light receiving element arranged on one surface side of a panel in which the first substrate and the second substrate are bonded together, and light emitted from the light source is reflected toward the light receiving element on the other surface side. You may perform using the reflective element arrange | positioned so that.

In the present invention, the light transmittance is monitored by
It is preferable that a polarizing plate is arranged at an intermediate position in the optical path from the light source to the light receiving element. According to this structure, the injection state of the liquid crystal is monitored only from the specific polarization component in the natural light emitted from the light source, so that the change in the light transmittance can be detected more clearly.

In such a method of manufacturing a liquid crystal display device, a liquid crystal injecting device for injecting liquid crystal into the gap between the first substrate and the second substrate bonded together with a predetermined gap, A device having a light source that emits light toward a predetermined position in a region in which the liquid crystal is injected in the gap and a light receiving element that receives light emitted from the light source and transmitted through the region is used.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 are a vertical sectional view and a plan view showing the structure of a plastic film liquid crystal display panel, respectively. The present invention can be applied to both the plastic film liquid crystal display panel described here and the liquid crystal display panel using the glass substrate shown in FIG.
Moreover, the plastic film liquid crystal display panel is shown in FIG.
The function of each component is common with the liquid crystal display panel using the glass substrate shown in FIG. Therefore, the same reference numerals are given to parts having common functions.

In FIG. 1, the liquid crystal display panel 1 of this embodiment is shown.
(Liquid crystal display device) includes a first transparent substrate 10 having a transparent transparent plastic film as a base material, and a second transparent substrate 20 having a transparent transparent plastic film also having a flexible base material. And have. A sealant 30 is formed on one of these transparent substrates by printing,
The first transparent substrate 10 and the second transparent substrate 20 are bonded and fixed with a predetermined gap 31 (cell gap) therebetween with the sealant 30 sandwiched therebetween. Here, the first transparent substrate 1
The cell gap between 0 and the second transparent substrate 20 is defined by the spacer 32 interposed between the first transparent substrate 10 and the second transparent substrate 20.

As shown in FIG. 2, the sealant 30 is formed with a discontinuity as a liquid crystal injection port 301 at the time of injecting liquid crystal, and the liquid crystal injection port 301 is made of a sealing agent 305 made of an ultraviolet curable resin. It is sealed.

Referring again to FIG. 1, the sealing agent 30 in the gap 31 between the first transparent substrate 10 and the second transparent substrate 20.
The liquid crystal LC is enclosed in the liquid crystal enclosure region 300 defined by the section. Alignment films 101 and 201 are formed on both the first transparent substrate 10 and the second transparent substrate 20,
The liquid crystal LC is STN (Super Twisted Ne
It is designed to be used in the "matic" method.

Polarizing plates 102 and 202 are attached to the outer surfaces of the first transparent substrate 10 and the second transparent substrate 20, respectively. When the liquid crystal display panel 1 is configured as the reflective liquid crystal display panel 1, the second transparent substrate 2 is used.
For the polarizing plate 202 attached to 0, the reflection plate 203
Is pasted.

The second transparent substrate 20 is the first transparent substrate 10
Since the second transparent substrate 20 is larger than the first transparent substrate 10, a part of the second transparent substrate 20 projects from the lower end edge of the first transparent substrate 10, and the terminal formed in this projecting portion is interposed with an anisotropic conductive film or the like. The flexible printed wiring board 2 is connected. Here, a plurality of stripe-shaped electrodes 105 extending in the lateral direction are formed on the inner surface of the first transparent substrate 10 by an ITO film, for example, and an ITO film is formed on the inner surface of the second transparent substrate 20 by an ITO film. A plurality of stripe-shaped electrodes 205 extending in the vertical direction are formed. A pixel is formed at each intersection of these stripe electrodes 105 and 205. Therefore, by applying a voltage to the desired appropriate stripe electrodes 105 and 205 based on the drive signal, the alignment state of the liquid crystal LC in each pixel can be controlled and a desired image can be displayed on the liquid crystal display panel 1. .

A method of manufacturing a liquid crystal display panel 1 (method of manufacturing a liquid crystal display device) using such a plastic film will be described with reference to FIG.

FIG. 3 is a process sectional view showing a method of manufacturing a plastic film liquid crystal display panel.

First, in the ITO sputtering step ST1, the ITO film 501 is continuously sputtered on the plastic film supplied by the roll R. This I
From the TO sputtering step ST1 to the sheet cutting step described later, the first transparent substrate 10 and the second transparent substrate 20.
Both are made to a common plastic film supplied by roll R. In addition, the first transparent substrate 1 is formed on the common plastic film supplied by the roll R.
Since 0 and the second transparent substrate 20 are basically subjected to the same processing up to the sheet cutting step, in FIG.
Up to the sticker printing step, only the first transparent substrate 10 and the plastic film for forming the first transparent substrate 10 are shown.

Next, for both parts of the plastic film for forming the first transparent substrate 10 and the second transparent substrate 20, the photolithography step ST2 is performed.
I do. In this photolithography step ST2, first, a resist 502 is applied to the entire surface of the ITO film 501 formed on a plastic film, and then exposure and development are performed using a photomask 503 to form a resist mask 504. Next, the ITO film 501 is etched using the resist mask 504 as a mask to pattern the stripe electrodes 105 and 205, respectively, and then the resist mask 504 is peeled and removed.

Next, in the sheet cutting step ST3, the plastic film is cut into a predetermined length dimension to form the plastic film for forming the first transparent substrate 10 and the second transparent substrate 20. Divide into plastic film.

Next, in the alignment film printing / sintering step ST4, the alignment film 101 is formed on both the plastic film for forming the first transparent substrate 10 and the plastic film for forming the second transparent substrate 20. Form 201.

Next, in the rubbing step ST5, the first
The rubbing process is performed on both the plastic film for forming the transparent substrate 10 and the plastic film for forming the second transparent substrate 20.

Next, in the seal printing step ST6, the sealing agent 30 is printed on the plastic film for forming the second transparent substrate 20 or the plastic film for forming the first transparent substrate 10. In this sticker printing step ST6, as described with reference to FIG. 2, a part of the sealant 30 is provided with a discontinuity as the liquid crystal inlet 301.

Next, in the assembly step ST7, after the spacers 32 are scattered on the plastic film side for forming the first transparent substrate 10 or the plastic film side for forming the second transparent substrate 20, A plastic film for forming the first transparent substrate 10,
A plastic film for forming the second transparent substrate 20 is attached via a sealant 30.

The panel 100 made of the plastic film thus laminated is cut into strips ST8.
At, cut into strips. This strip cutting process ST8
Then, since the part which becomes the liquid crystal display panel 1 is connected in a line in a strip shape when it is divided later, at the cut part, the liquid crystal injection ports 301 are respectively formed in any part becoming the liquid crystal display panel 1. It will be open.

Next, in the injection / sealing step ST9 (liquid crystal injection step), the first transparent substrate 10 and the second transparent substrate 2
Liquid crystal is injected into the gap 31 between the liquid crystal layer and zero.

The injection / sealing step ST9 will be described in detail with reference to FIGS. This injection / sealing step S
When performing T9, a plurality of panels 100 in which the first transparent substrate 10 and the second transparent substrate 20 are bonded are connected in a strip shape, but in FIGS. 4 to 6, one panel is used. Only the portion corresponding to 100 is shown.

First, as shown in FIGS. 4 (A) and 4 (B),
The panel 100 in which the first transparent substrate 10 and the second transparent substrate 20 are bonded together is put in a predetermined position in the processing chamber 4 of the liquid crystal injection device. The liquid crystal injection device according to this embodiment has a light source 61 and a light receiving element 62 (optical sensor) in the processing chamber 4, and in the processing chamber 4, the first transparent substrate 10 and the second transparent substrate 20 are provided. A light source 61 is located on one surface side of the bonded panel 100, and a light receiving element 62 that receives light emitted from the light source 61 is located on the other surface side. Here, the light source 61 and the light receiving element 62 are arranged in two pairs, and the position where the light source 61 and the light receiving element 62 are arranged is the liquid crystal in the liquid crystal enclosing region 300 partitioned and formed by the sealant 30. The two positions are the furthest from the inlet 301, and these two positions are the positions where the liquid crystal LC reaches the last when the liquid crystal LC is injected from the liquid crystal injection port 301.

Next, the inside of the processing chamber 4 is evacuated to create a vacuum in the gap 31 sandwiched between the first transparent substrate 10 and the second transparent substrate 20.

Next, the container 41 in which the liquid crystal LC is stored
And the liquid crystal injection port 301 causes the liquid crystal LC in the container 41 to rise.
It is soaked in. In this state, when the inside of the processing chamber 4 is opened to the atmosphere and the vacuum state is released, the inside of the gap 31 sandwiched between the first transparent substrate 10 and the second transparent substrate 20 remains in the vacuum state. As shown in A) and (B), the liquid crystal LC is sucked into the gap 31 from the liquid crystal inlet 301.

Immediately after such injection of the liquid crystal LC is started, the liquid crystal does not reach the optical path connecting the light source 61 and the light receiving element 62, so that the light transmittance of this optical path is at a high level. Then, the injection of the liquid crystal LC progresses, and FIG.
As shown in (A) and (B), the light source 61 and the light receiving element 62
It is assumed that the liquid crystal has reached the optical path connecting with. This time is the time when the injection of the liquid crystal LC is completed.

In such a situation, the light source 6
The liquid crystal LC is interposed in the optical path from 1 to the light receiving element 62, and the light transmittance in this optical path sharply decreases as shown by the solid line F in FIG. Therefore, the light receiving element 6
It can be said that the injection state of the liquid crystal LC can be monitored by monitoring the amount of received light at 2. Therefore, the injection of the liquid crystal LC is stopped at the time when the amount of light received by the light receiving element 62 ends, or when a predetermined time elapses after the amount of light received by the light receiving element 62 ends.

After the injection of the liquid crystal LC is completed in this way, as described with reference to FIG.
1 is sealed with a sealant 305 made of an ultraviolet curable resin.

Referring again to FIG. 3, after the liquid crystal injection / sealing step ST9 is completed, the strip-shaped plastic film is cut into the single-piece liquid crystal display panel 1 in the single-piece cutting step ST10.

Next, in the pressure-bonding step ST11, the flexible printed wiring is connected to the terminal of the portion where the second transparent substrate 20 projects from the lower edge of the first transparent substrate 10 via an anisotropic conductive film or the like. The board 2 is electrically connected.

Next, in the polarizing plate attaching step ST12,
The polarizing plates 102 and 202 and the reflection plate 203 are attached to the outer surfaces of the first transparent substrate 10 and the second transparent substrate 20, respectively.

Then, in the final inspection step ST13, a predetermined inspection signal is supplied through the flexible printed wiring board 2 to inspect each pixel such as full lighting or partial lighting.

As described above, in the method of manufacturing the liquid crystal display panel 1 according to the present embodiment, when the injection of the liquid crystal LC progresses to the position where the light transmittance is monitored, the light transmittance changes abruptly. The injection state of the liquid crystal LC into the gap 31 is directly monitored. Therefore, the timing at which the injection of the liquid crystal into the gap 31 is completed can be accurately detected based on the timing at which the light transmittance changes. Therefore, even if the liquid crystal display panel 1 is upsized, insufficient liquid crystal injection does not occur. Therefore, the gap 3
Since the liquid crystal injection process does not end with the negative pressure inside 1, the problem that impact bubbles are generated can be avoided. Further, since the inside of the gap 31 does not become a negative pressure due to insufficient injection of the liquid crystal LC, the deformation of the liquid crystal display panel 1 due to the negative pressure as described with reference to FIG. 13A is prevented. it can. Therefore, it is more effective when the present invention is applied to the manufacturing process of the plastic film liquid crystal display panel. Moreover, since the wasteful injection time can be reduced, the productivity is improved.

In addition, when the liquid crystal LC is injected, pressure may be applied. In such a case, in addition to insufficient injection of the liquid crystal LC, excessive injection may occur. However, according to the present invention, since the injection state of the liquid crystal LC into the gap 31 can be accurately monitored, such an excessive injection amount of the liquid crystal does not occur. Therefore, since the deformation as described with reference to FIG. 13B does not occur, it is possible to prevent the color unevenness and the decrease in the response speed due to the excessive liquid crystal injection amount.

[Other Embodiments] In the above embodiment, the base material of the first transparent substrate 10 and the second transparent substrate 2 are used.
The manufacturing method of the plastic liquid crystal display panel in which the base material of No. 0 is composed of the plastic film has been described as an example.
Even when the present invention is applied to the method of manufacturing the liquid crystal display panel 1 using the glass substrate described with reference to No. 1, since there is no excess or deficiency in the injection amount of liquid crystal, the inside of the gap 31 is negative pressure. It is possible to prevent generation of impact bubbles due to the above.

In the above embodiment, the first transparent substrate 10
The liquid crystal injecting device in which the light source 61 is arranged on one surface side of the panel in which the and the second transparent substrate 20 are bonded and the light receiving element 62 is arranged on the other surface side is used, but as shown in FIG. ,
A light source 61 and a light receiving element 62 arranged on one surface side of the panel 100 in which the first transparent substrate 10 and the second transparent substrate 20 are bonded, and a light receiving element for emitting light from the light source 61 on the other surface side. By using a liquid crystal injection device having a reflection mirror 63 (reflection element) that reflects toward 62, the light transmittance at a predetermined position in the gap 31 is monitored to detect the timing at which the injection of the liquid crystal LC should be ended. May be.

Further, as shown in FIG. 9A, in the liquid crystal injection device, the first transparent substrate 10 and the second transparent substrate 2 are used.
The light source 6 is provided on one surface side of the panel 100 in which
When 1 is arranged and the light receiving element 62 is arranged on the other surface side, the polarizing plates 71 and 72 are provided between the light paths of the light source 61 and the panel 100 and between the light path of the light receiving element 62 and the panel 100, respectively. Liquid crystal LC that is arranged and only from a specific polarization component
May be monitored for injection status. Further, as shown in FIG. 9B, the light source 61 and the light receiving element 62 are arranged on one surface side of the panel 100 in which the first transparent substrate 10 and the second transparent substrate 20 are bonded, and the other is arranged. Even in the case of a liquid crystal injection device in which a reflection mirror 63 (reflection element) is arranged on the surface side, the light source 61
A polarizing plate 7 is provided between the optical path between the light receiving element 62 and the panel 100 and between the optical path between the reflecting mirror 63 and the panel.
Alternatively, the injection state of the liquid crystal LC may be monitored from only a specific polarization component by disposing 3, 74.

Further, in the above embodiment, the method of injecting the liquid crystal into the gap 31 by vacuuming the inside of the gap 31 has been described, but as shown in FIGS. The liquid crystal injection port 3 formed of the first discontinuous portion of the sealant 30 between the transparent substrate 10 and the second transparent substrate 20.
In the case of performing the injection method in which the liquid crystal LC is sucked into the gap 31 by forming the suction port 309 formed of the second discontinuity and vacuum suctioning the inside of the gap 31 from the suction port 309. Also, by applying the present invention, it is possible to prevent the liquid crystal injection amount from being excessive or insufficient. Also in this case, the light source 6 is placed at the position described with reference to FIGS. 4, 8 and 9.
1 or the light receiving element 62 may be arranged, but in the case of cutting in a strip shape later, as shown in FIGS. 10 (A) and 10 (B),
The light source 61 and the light receiving element 62 may be arranged near the suction port 309.

In the above embodiment, both substrates are transparent, but at least the portion where the light transmittance can be monitored is transparent, and the entire substrate need not be transparent.

[0053]

As described above, the method of manufacturing a liquid crystal display device according to the present embodiment utilizes the fact that when the liquid crystal is injected to the position where the light transmittance is monitored, the light transmittance changes abruptly. The feature is that the injection state of the liquid crystal into the gap is directly monitored and the injection of the liquid crystal is finished at the optimum timing. Therefore, according to the present invention, since the liquid crystal injection amount does not have an excess or deficiency, there are problems such as impact bubbles and deformation due to insufficient injection, and a decrease in response speed due to deformation due to excessive injection. It can be avoided. Moreover, since the wasteful injection time can be reduced, the productivity is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a configuration of a liquid crystal display device using a plastic film liquid crystal display panel.

FIG. 2 is a plan view of the liquid crystal display device shown in FIG.

3A to 3D are process cross-sectional views showing a method of manufacturing the liquid crystal display device shown in FIG.

4A and 4B are respectively a front view and a cross-sectional view showing a state just before injecting liquid crystal into a gap in a liquid crystal injecting step in the manufacturing process of the liquid crystal display device shown in FIG. is there.

5A and 5B are front views showing a state immediately after starting the injection of liquid crystal into the gap in the liquid crystal injection step in the manufacturing process of the liquid crystal display device shown in FIG. 1, and FIG.

6A and 6B are respectively a front view and a cross-sectional view showing a state where liquid crystal has been injected into the gap in the liquid crystal injection step in the manufacturing process of the liquid crystal display device shown in FIG. 1. is there.

FIG. 7 is an explanatory diagram showing how the light transmittance of the gap changes as the liquid crystal injection step shown in FIGS. 5 to 7 progresses.

FIG. 8 is a view showing a liquid crystal injection process shown in FIGS.
It is sectional drawing which shows another example of arrangement | positioning of the light source and light receiving element for monitoring the light transmittance of a gap.

9A and 9B are cross-sectional views when a polarizing plate is used to monitor the light transmittance of the gap in the liquid crystal injection step shown in FIGS. 5 to 8.

10A and 10B are respectively a front view and a cross-sectional view showing another method for injecting liquid crystal into the gap of the liquid crystal display panel.

FIG. 11 is an explanatory diagram showing a configuration of a liquid crystal display panel using a glass substrate.

12A and 12B are front views showing a step of injecting liquid crystal into a liquid crystal display panel by a conventional manufacturing method,
And FIG.

13A and 13B are cross-sectional views each illustrating a problem when liquid crystal is injected into a plastic liquid crystal display panel by a conventional manufacturing method.

[Explanation of symbols]

1 Liquid crystal display panel (liquid crystal display device) 2 Flexible printed wiring board 10 First transparent substrate 20 Second transparent substrate 30 sealant 31 Gap 32 spacer 61 light source 62 light receiving element 63 Reflector (Reflector) 71, 72, 73, 74 Polarizing plate 100 panels 101, 201 Alignment film 102, 202 Polarizing plate 105, 106 Striped electrode 203 reflector 300 Liquid crystal enclosed area 301 Liquid crystal inlet 305 Sealant 309 suction port LC liquid crystal

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02F 1/1341 G02F 1/13 101

Claims (3)

(57) [Claims] 1. A first device which is attached with a predetermined gap.
A method of manufacturing a liquid crystal display device, comprising: a liquid crystal injecting step of injecting liquid crystal into the gap between the substrate and the second substrate, wherein the liquid crystal injecting step comprises: The light transmittance at a predetermined position is monitored, and the monitoring of the light transmittance is different from the light source arranged on one surface side of the panel in which the first substrate and the second substrate are bonded and the light source. Using a light receiving element arranged at a position and a reflecting element arranged so that the light emitted from the light source is reflected toward the light receiving element on the other surface side, and at the timing when the light transmittance changes. A method for manufacturing a liquid crystal display device, characterized in that the injection of the liquid crystal into the region is completed based on the above. 2. The method for manufacturing a liquid crystal display device according to claim 1, wherein the monitoring of the light transmittance is performed with a deflecting plate arranged at an intermediate position of an optical path from the light source to the light receiving element. . 3. A liquid crystal injecting device for injecting liquid crystal into the gap between a first substrate and a second substrate bonded together with a predetermined gap, wherein liquid crystal is injected into the gap. A light source that emits light toward a predetermined position in a region that is arranged on one surface side of a panel in which the first substrate and the second substrate are bonded together,
Different from the reflection element arranged to reflect the light emitted from the light source on the other surface side and the light source that receives the light reflected from the reflection element on the one surface side and retransmitted through the region. A liquid crystal injection device, comprising: a light receiving element disposed at a position.