JP2003043504A - Method and device for manufacturing liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately control a sealant penetration position in a stuck substrate to prevent over-penetration or under-penetration of a sealant with respect to a method and device for manufacturing a liquid crystal display panel, which seal a liquid crystal charging port in the stuck substrate where liquid crystal has been charged. SOLUTION: The device for manufacturing the liquid crystal display panel is constituted of a light source 2 which radiates light on an optical path passing the vicinity of a desired penetration position of a sealant 20 at the time when a stuck substrate 14 in which a liquid crystal charging port 26 is coated with the sealant 20 is placed, a pair of polarizing plates 4 and 6 which are arranged on the optical path on both sides of the placed stuck substrate 14 so that their axes of polarization may be parallel, a detector 8 which detects the intensity of transmission light transmitted through the polarizing plates 4 and 6 to output a transmission light intensity signal, a control part 12 which outputs a sealant hardening signal on the basis of the transmission light intensity signal, and a UV lamp 10 which hardened the sealant 20 on the basis of the sealant hardening signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel manufacturing apparatus and manufacturing method for sealing a liquid crystal injection port of a bonded substrate in which liquid crystal is injected.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices used in display units such as notebook PCs, handy video cameras, televisions, and various monitors have a thin film transistor (TFT) as a switching element for each pixel.
The mainstream of this is an active matrix type color liquid crystal display device having a tor), and further large size and high quality display and high reliability are required.

A liquid crystal display panel used in an active matrix type liquid crystal display device is bonded to a bonded substrate in which a pair of glass substrates are bonded to each other with a predetermined cell gap via a sealing material applied to the outer peripheral portion. It is composed of liquid crystal injected into the laminated substrate. The liquid crystal injection process of the conventional method for manufacturing a liquid crystal display panel is as follows.

First, the bonded substrate stack is stored in a cassette and placed in a vacuum chamber. Next, evacuate the vacuum chamber,
The liquid crystal injection port formed on one end side of the bonded substrate is brought into contact with the liquid crystal filled in the liquid crystal dish. Next, the inside of the vacuum chamber is returned to atmospheric pressure, and liquid crystal is injected into the bonded substrate by the pressure difference between the inside and outside of the bonded substrate. Next, the bonded substrate in which the liquid crystal is injected is pulled up, and a UV (Ultra Violet ray) curable or thermosetting resin (sealing material) is applied to the liquid crystal injection port using a dispenser or the like. In order to reliably seal the liquid crystal injection port, it is necessary to allow the sealing material to penetrate into the bonded substrate to the extent that it does not reach the display area. Since the encapsulant gradually penetrates into the bonded substrate, after applying the encapsulant to the liquid crystal injection port, the predetermined standing time (several seconds) that has become the know-how in the process and is empirically required. Leave it as it is for several tens of seconds. It is determined that the permeation of the sealing material is completed when a predetermined standing time has elapsed, and the liquid crystal injection port is irradiated with UV light or the liquid crystal injection port is heated to cure the sealing material. The liquid crystal display panel is completed through the above steps.

[0005]

However, in the method of judging the permeation position of the encapsulant by the leaving time, if the viscosity of the encapsulant, the width of the liquid crystal injection port, the cell gap, etc. are varied, the Even if the time is constant, the penetration position of the sealing material is not constant. Therefore, there is a problem that the sealing material penetrates too much into the display area and causes a defective display in the completed liquid crystal display device. Conversely, the encapsulant does not penetrate into the bonded substrate at all, due to insufficient penetration, the encapsulant is peeled off after the encapsulant is cured and liquid crystal leaks, or water enters through the gap between the encapsulant and the sealant. Then, there arises a problem that the reliability of the liquid crystal display device is lowered.

Further, in recent liquid crystal display panels, the area of the peripheral region other than the display region has been reduced due to the narrowing of the frame, and the low voltage drive liquid crystal is used. It is falling. Therefore, there is a problem that unevenness near the liquid crystal injection port is more likely to occur due to excessive penetration of the sealing material.

An object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a liquid crystal display panel, which can accurately control the permeation position of a sealing material in a bonded substrate and prevent excessive or insufficient penetration of the sealing material. It is in.

[0008]

The above object has an optical path that passes near a desired permeation position of the sealing material when a bonded substrate having a sealing material applied to the liquid crystal inlet is placed. A pair of polarizing plates and a pair of polarizing plates arranged on the optical path such that the light source unit for irradiating light and the mounted bonded substrate are sandwiched so that their polarization axes are parallel to each other. Detecting the intensity of the transmitted transmitted light, a detection unit that outputs a transmitted light intensity signal, a control unit that outputs a sealing material curing signal based on the transmitted light intensity signal, and based on the sealing material curing signal A liquid crystal display panel manufacturing apparatus, comprising: an encapsulant curing section for curing the encapsulant.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display panel manufacturing apparatus and manufacturing method according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration of a liquid crystal display panel manufacturing apparatus according to the present embodiment.
As shown in FIG. 1, the liquid crystal display panel manufacturing apparatus has a light source 2 of a light source unit that irradiates light on a predetermined optical path.
A detector 8 of a detection unit that detects the intensity of the light emitted from the light source 2 is arranged facing the light source 2. Polarizing plates 4 and 6 are arranged between the light source 2 and the detector 8 such that their polarization axes are parallel to each other. The detector 8 is connected to the control unit 12. The control unit 12 is connected to a UV lamp (ultraviolet irradiation device) 10 in the encapsulating material curing unit. A bonded substrate 14 having a pair of transparent glass substrates 16 bonded together is placed between the polarizing plates 4 and 6. When the laminated substrate 14 is placed, the laminated substrate 14 and the polarizing plates 4 and 6 are arranged such that their respective surfaces are substantially parallel to each other.

Next, a method of manufacturing the liquid crystal display panel according to this embodiment will be described. First, as shown in FIG. 2, the UV curable encapsulant 20 is applied to the liquid crystal injection port 26 of the bonded substrate 14 placed at a predetermined position using a dispenser or the like. The sealing material 20 gradually penetrates into the bonded substrate stack 14. Next, light L1 is emitted from the light source 2. The light L1 passes through the polarizing plate 4 and becomes linearly polarized light L2 having a vertical polarization direction as shown by an arrow a. The light L2 passes through the vicinity of a desired sealing material permeation position (hereinafter, referred to as “aim”) 18 of the bonded substrate 14 where the sealing material permeates, and becomes light L3. When the sealing material 20 has not penetrated to the target 18, as shown in FIG. 1, the light L2 passes through only the two glass substrates 16, so that the polarization direction is not disturbed and the light L3 is changed to the light L2. Similarly, it becomes a linearly polarized light having a polarization direction as shown by an arrow a. Light L3
Is transmitted through the polarizing plate 6 having a polarization axis in the same direction as the polarization direction of the light L3, and becomes light L4 having a polarization direction as indicated by an arrow a like the lights L2 and L3.

On the other hand, when the sealing material 20 has penetrated to the target 18, the light L2 passes through the two glass substrates 16 and the sealing material 20 between them, as shown in FIG. Since the sealing material 20 is a resin having a predetermined polarization axis, the polarization direction is disturbed, and the light L3 ′ is scattered light as shown by an arrow b.
The light L3 ′ passes through the polarizing plate 6 and becomes linearly polarized light L4 ′ as shown by an arrow c. The light L4 ′ has a lower intensity than the light L4 because the light L3 ′ except for the components parallel to the polarization axis of the polarizing plate 6 is absorbed by the light polarizing plate 6. The detector 8 detects the intensity of the light L4 or the light L4 ′ and outputs it to the controller 12 as a transmitted light intensity signal. The control unit 12 determines that the sealing material 20 has penetrated to the target 18 when the light intensity exceeds a predetermined threshold value, and outputs a sealing material curing signal to the UV lamp 10. The UV lamp 10 lights up when a sealing material curing signal is input, and irradiates UV light to cure the sealing material 20. The lighting time of the UV lamp 10 is managed by a timer, and the UV lamp 10 is turned off after a lapse of a predetermined time. Through the above steps, the liquid crystal display panel according to the present embodiment is completed.

In the present embodiment, the sealing material 20 is cured by detecting that the sealing material 20 has penetrated to a desired position due to a decrease in light intensity. Therefore, it is possible to prevent display failure of the liquid crystal display panel due to excessive penetration of the sealing material 20, and to prevent leakage of liquid crystal and infiltration of water due to insufficient penetration of the sealing material 20.

Next, a manufacturing apparatus and a manufacturing method of the liquid crystal display panel according to the second embodiment will be described with reference to FIG. FIG. 3 shows the configuration of a liquid crystal display panel manufacturing apparatus according to this embodiment. Constituent elements having the same functions and functions as those of the liquid crystal display panel manufacturing apparatus shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 3, the liquid crystal display panel manufacturing apparatus according to this embodiment includes a collimator lens 22 and an objective lens 24. The light emitted from the light source 2 is collimated by the collimator lens 22. Further, the parallel light is condensed by the objective lens 24, and the intensity is detected by the detector 9. The bonded substrate stack 1 is provided between the collimator lens 22 and the objective lens 24.
4 is placed. When the parallel light passes through the bonded substrate stack 14, it passes through the vicinity of the upper end portion of the bonded substrate stack 14 and the vicinity of the aim 18.

Next, a method of manufacturing the liquid crystal display panel according to this embodiment will be described. First, as shown in FIG. 3, the UV curing encapsulant 21 is applied to the liquid crystal injection port 26 of the bonded substrate 14 placed at a predetermined position using a dispenser or the like. The encapsulating material 21 is colored black, for example, and blocks light. The intensity of light detected by the detector 9 varies depending on the position of the sealing material 21, and becomes the minimum when the lower end of the sealing material 21 reaches the aim 18. The detector 9 detects the intensity of light and outputs it to the controller 12 as a transmitted light intensity signal. The control unit 12 determines that the sealing material 21 has penetrated to the target 18 when the light intensity exceeds a predetermined threshold value, and outputs the sealing material curing signal to the UV lamp 1.
Output to 0. The UV lamp 10 lights up when a sealing material curing signal is input, and irradiates UV light to cure the sealing material 20. The irradiation time of the UV lamp 10 is managed by a timer, and the UV lamp 10 is turned off after a lapse of a predetermined time. Through the above steps,
The liquid crystal display panel according to the present embodiment is completed.

In the present embodiment, the sealing material 21 is cured by detecting that the sealing material 21 has penetrated to the desired position by the decrease in the intensity of light. Therefore, similar to the first embodiment, it is possible to prevent the display failure of the liquid crystal display panel due to the excessive penetration of the sealing material 21, and to prevent the leakage of liquid crystal and the infiltration of water due to the insufficient penetration of the sealing material 21. it can.

Next, a substrate for a liquid crystal display device according to a third embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 shows a configuration around the liquid crystal injection port 26 of the bonded substrate 15 in which the substrate for a liquid crystal display device according to the present embodiment and the substrates arranged to face each other are bonded.
FIG. 5 shows a cross section of the bonded substrate stack 15 shown in FIG. 4 taken along line AA ′. As shown in FIGS. 4 and 5, the glass substrate 16 and the opposing substrate 16 ′ are attached to each other via the sealing material 30 applied to the end portion of the glass substrate 16 to form the attached substrate 15. Also,
On the glass substrate 16, a light shielding film 2 that shields a predetermined area from light.
8 is formed. The light-shielding film 28 is aimed at so that it can detect that the sealing material has penetrated to a desired penetration position.
The vicinity of 8 has an opening portion (light transmitting portion) 32 opened in a predetermined shape such as a rectangular shape or a slit shape.

According to the present embodiment, a bonded substrate in which a liquid crystal display substrate designed so that the light shielding film 28 is formed in the vicinity of the target 18 and a substrate arranged facing each other are bonded to each other. Even if the number is 15, the same effects as those of the first or second embodiment can be obtained by using the manufacturing apparatus and the manufacturing method of the liquid crystal display panel according to the first or second embodiment. Further, according to the present embodiment, since the light shielding film 28 is opened only in the vicinity of the target 18, C
The detection using a CD camera or the like becomes easy.

Next, a liquid crystal display panel manufacturing apparatus and manufacturing method according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows the configuration of a liquid crystal display panel manufacturing apparatus according to this embodiment. The constituent elements having the same functions and functions as the constituent elements of the liquid crystal display panel manufacturing apparatus according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 6, the liquid crystal display panel manufacturing apparatus according to the present embodiment is provided with a cassette 34 of a substrate holding unit capable of storing x (for example, 30 sheets of one lot) of bonded substrates 14-1 to 14-x. have. The cassette 34 is provided with an arm portion (not shown) at the bottom for the number of storable bonded substrates 14. Each arm is composed of the bonded substrates 14-1 to 14-1.
14-x, each of which is a substrate moving mechanism capable of moving a predetermined distance in the vertical direction.

Next, a method of manufacturing the liquid crystal display panel according to this embodiment will be described. First, as shown in FIG. 6, the bonded substrates 14-1 to 14-1 after the liquid crystal has been injected.
Store 4-x in cassette 34. All the bonded substrates 14-1 to 14-x are pushed up by the arm portion, and all the targets are on the same optical path connecting the light L1 emitted from the light source 2 and the light L4 detected by the detector 8. 18
It is mounted so that -1 to 18-x are located. In this initial state, the light L2 is applied to the bonded substrates 14-1 to 14-x.
Since it transmits only the glass substrate 16 constituting the above, the polarization direction is not disturbed.

Next, as shown in FIG. 7, using the method for manufacturing a liquid crystal display panel according to the first embodiment, for example, the liquid crystal injection port 2 of the bonded substrate 14-1 closest to the light source 2 is used.
The sealing material 20-1 is applied to 6-1. When the sealing material 20-1 penetrates to the target 18-1 of the bonded substrate 14-1, the sealing material 20-1 disturbs the polarization direction of the light L2.
The detector 8 detects a change in the intensity of the light L4 and outputs it as a transmitted light intensity signal to the control unit 12. The control unit 12 determines that the sealing material 20-1 has penetrated to the target 18-1 when the light intensity exceeds a predetermined threshold value, and turns on the UV lamp 10 to turn on the sealing material 20-1. Cure.

Next, as shown in FIG. 8, after the sealing of the bonded substrate 14-1 is completed, the bonded substrate 14-1
The arm that supports is lowered. Then the sealing material 2
0-1 deviates from the optical path, and the intensity of the light L4 returns to the initial value. Then, similarly to the bonded substrate stack 14-1, the bonded substrates 14-2 to 14-x are sealed one by one.
In this embodiment, a plurality of bonded substrates 14-1 are used.
It is desirable to use a laser beam having good directivity because it transmits the light of about 14-x.

Next, the manufacturing apparatus and manufacturing method of the liquid crystal display panel according to the present embodiment will be described more specifically using one example. FIG. 9 shows the configuration of a liquid crystal display panel manufacturing apparatus according to this embodiment. As shown in FIG. 9, the liquid crystal display panel manufacturing apparatus according to the present embodiment has a HeNe laser (oscillation wavelength 632 nm) 46 in the light source section. Opposite to the HeNe laser 46, a photomultiplier 48 of a detection unit for detecting the laser light emitted from the HeNe laser 46 is arranged. Between the HeNe laser 46 and the photomultiplier 48, the polarizing plate 4 of the polarizer and the polarizing plate 6 of the analyzer are arranged so that their polarization axes are parallel to each other. The photomultiplier 48 is connected to the control unit 12. The UV lamp 10 of the encapsulant curing unit is connected to the control unit 12. UV
One end of an optical fiber 50 is attached to the lamp 10. The other end of the optical fiber 50 is movable,
By positioning the other end at a predetermined position, it is possible to locally irradiate the desired position with the UV light propagating in the optical fiber 50.

Between the polarizing plates 4 and 6, x (for example, 30 sheets of one lot) bonded substrates 14-1 to 14-14 are provided.
A cassette 34 capable of storing -x is arranged. The cassette 34 has a laser beam L1 emitted from the HeNe laser 46 and a laser beam L4 detected by the photomultiplier 48.
All objectives 18-1 to 18- on the same optical path connecting
bonded substrates 14-1 to 14-x so that x is positioned
Can be placed. The cassette 34 is equipped with an arm portion (not shown in FIG. 9) at the bottom for the number of storable sheets of the bonded substrates 14-1 to 14-x. Each arm portion can support the bonded substrates 14-1 to 14-x, respectively.

FIG. 10 shows the construction of the arm portion 36 of the liquid crystal display panel manufacturing apparatus according to this embodiment. Figure 10
As shown in FIG. 3, the arm portion 36 includes a shaft 38 formed for each arm portion 36, an elliptical cam 40 that rotates about the shaft 38, and an arm 42 that supports the bonded substrate stack 14.
And have. The arm 42 moves in the vertical direction based on the direction of the long axis of the cam 40, and the bonded substrates 14-1 to 14-1 so that the hardened sealing material is removed from the optical path.
The 4-x can be moved. In the initial state, the long axes of all the cams 40 are, for example, oriented in the vertical direction, and all the bonded substrates 14-1 to 14-x.
Is pushed up.

Next, a method of manufacturing the liquid crystal display panel according to this embodiment will be described. First, FIGS. 11A and 11B
As shown in FIG. 2, a soluble polyimide alignment film (not shown) is formed on the surfaces of two glass substrates 16A ′ and 16B ′ each having a size corresponding to four liquid crystal display panels on which transparent electrodes such as ITO are formed. Print and bake. Next, a sealing material 30 such as an epoxy resin is applied to the outer peripheral portion of each of the glass substrates 16A 'for each liquid crystal display panel (FIG. 11A shows only one liquid crystal display panel of the glass substrate 16A'. ing.). Next, a plastic spacer (not shown) is sprinkled on the other glass substrate 16B ', and both substrates 16A',
16B 'is pasted together. Next, both substrates 16A ′, 16
B ′ is heated to about 200 ° C. to heat cure the sealing material 30. Next, as shown in FIG. 12, both substrates 16A ′, 1
6B 'is cut into a predetermined shape. Next, liquid crystal is injected from the liquid crystal injection port 26 formed on one end side to bond the substrate 1.
4 is formed.

Next, as shown in FIG. 9, the bonded substrates 14-1 to 14-x shown in FIG. 12 are stored in the cassette 34. All bonded substrates 14-1 to 14-x
Are pushed up by the arm portion 36 and placed so that all the targets 18-1 to 18-x are located on the same optical path. In this initial state, the laser light L2 transmits only the glass substrate 16 that constitutes the bonded substrates 14-1 to 14-x, so that the polarization direction is not disturbed. Each of the targets 18-1 to 18-x is on the center line of the liquid crystal injection port 26 when viewed in the direction perpendicular to the substrate surface, and is the bonded substrate 14-
1 to 14-x is, for example, a position 0.7 mm below the upper end side in the figure and below.

Next, for example, a sealing material (not shown) made of an ultraviolet curing acrylic epoxy resin is applied to the liquid crystal injection port 26-1 of the bonded substrate 14-1 closest to the HeNe laser 46. When the sealing material penetrates to the target 18-1 of the bonded substrate 14-1, the sealing material disturbs the polarization direction of the light L2 and reduces the intensity of the light L4.
The received light voltage of changes. The control unit 12 triggers the change in the received light voltage input from the detector 8 as a trigger.
And turn on the UV light through the optical fiber 50, for example, 2
It is irradiated for 0 seconds to cure the sealing material of the bonded substrate 14-1.

Next, almost at the same time when the liquid crystal injection port 26-1 of the bonded substrate 14-1 is completely sealed, the cam 40 of the arm portion 36 supporting the bonded substrate 14-1 is rotated by a predetermined angle. , The arm 42 descends. At that time, since the sealing material of the bonded substrate 14-1 is removed from the optical path, the intensity of the light L4 returns to the initial value. After that, the process after applying the sealing material is repeated to obtain the bonded substrate 14-1.
Similarly, the bonded substrates 14-2 to 14-x are sealed one by one.

In the present embodiment, the components of the first embodiment are used as the components for detecting that the sealing material has penetrated to the target, but the configuration of the second embodiment. Of course, you may use the element.

Further, in the present embodiment, the liquid crystal injection port 26a is sealed in order from the bonded substrate 14a closer to the light source 2, but it may be sealed from another bonded substrate.
The order is arbitrary.

According to this embodiment, the above first and second
It is possible to obtain the same effect as that of the above embodiment, and it is possible to perform batch processing of the liquid crystal injection port sealing step.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, the UV lamp is used as the encapsulant curing section and the ultraviolet curable resin is used as the encapsulant, but the present invention is not limited to this. A heating device may be used as the encapsulating material curing section and a thermosetting resin may be used as the encapsulating material.

The manufacturing apparatus and manufacturing method of the liquid crystal display panel according to the above-described embodiment can be summarized as follows. (Supplementary Note 1) A light source unit for irradiating light onto an optical path passing near a desired permeation position of the sealing material when the bonded substrate having the sealing material applied to the liquid crystal inlet is placed, A pair of polarizing plates arranged on the optical path so that their polarization axes are parallel to each other with the laminated substrate placed therebetween and the intensity of transmitted light transmitted through the pair of polarizing plates are detected. A detection unit that outputs a transmitted light intensity signal, and a control unit that outputs a sealing material curing signal based on the transmitted light intensity signal,
An encapsulant curing unit configured to cure the encapsulant based on the encapsulant curing signal, the apparatus for manufacturing a liquid crystal display panel.

(Supplementary Note 2) A light source unit for irradiating light onto an optical path passing near a desired penetration position of the sealing when a bonded substrate having a colored sealing material applied to the liquid crystal inlet is placed. A detection unit that detects the intensity of transmitted light transmitted near the permeation position and outputs a transmitted light intensity signal; a control unit that outputs a sealing material curing signal based on the transmitted light intensity signal; An encapsulating material curing unit that cures the encapsulating material based on a stop material curing signal.

(Supplementary Note 3) In the liquid crystal display panel manufacturing apparatus according to Supplementary Note 1 or 2, a plurality of the bonded substrates are placed so that the permeation position is located on the optical path, and the sealing material is cured. 2. The apparatus for manufacturing a liquid crystal display panel, further comprising: a substrate holding unit having a substrate moving mechanism that moves the bonded substrate having been completed in step 1 so as to move out of the optical path.

(Supplementary Note 4) A transparent substrate that seals liquid crystal together with a counter substrate, a light-shielding film provided on the transparent substrate,
When the liquid crystal is sealed together with the counter substrate and a sealant is applied to the liquid crystal inlet, a light transmission opening near the liquid crystal inlet of the light shielding film for detecting the penetration position of the sealant. And a substrate for a liquid crystal display device.

(Supplementary Note 5) In a liquid crystal display panel having a pair of transparent substrates arranged to face each other and a liquid crystal sealed between the pair of transparent substrates, at least one of the pair of transparent substrates is a supplementary note. 4. A liquid crystal display panel, which is the substrate for a liquid crystal display device according to 4.

(Supplementary Note 6) Linearly polarized light is irradiated onto the optical path passing through the vicinity of a desired permeation position of the sealing material of the bonded substrate having the liquid crystal injection port coated with the sealing material, and transmitted through the permeation position. A method for manufacturing a liquid crystal display panel, comprising detecting the light intensity of the linearly polarized light component of transmitted light and curing the sealing material based on the light intensity.

(Supplementary Note 7) Transmitted light that has passed through the permeation position by irradiating light on the optical path passing through the vicinity of the desired permeation position of the sealant of the bonded substrate having the liquid crystal injection port coated with the colored sealant. The light intensity of the liquid crystal display panel is detected, and the encapsulant is cured based on the light intensity.

(Supplementary Note 8) In the method for producing a liquid crystal display panel according to Supplementary Note 6 or 7, a plurality of the bonded substrates are placed so that the permeation positions are located on the same optical path.
A method for manufacturing a liquid crystal display panel, characterized in that the bonded substrates on which the sealing material has been cured are sequentially removed from the optical path.

[0041]

As described above, according to the present invention, it is possible to accurately control the permeation position of the encapsulant in the bonded substrate and prevent excessive or insufficient infiltration of the encapsulant.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an apparatus for manufacturing a liquid crystal display panel according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a method of manufacturing a liquid crystal display panel according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a liquid crystal display panel manufacturing apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a bonded substrate using a liquid crystal display device substrate according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration of a bonded substrate using a liquid crystal display device substrate according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of an apparatus for manufacturing a liquid crystal display panel according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a method of manufacturing a liquid crystal display panel according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a method of manufacturing a liquid crystal display panel according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of an apparatus for manufacturing a liquid crystal display panel according to an example of the fourth embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of an arm portion of a liquid crystal display panel manufacturing apparatus according to an example of a fourth embodiment of the present invention.

FIG. 11 is a diagram illustrating a method of manufacturing a liquid crystal display panel according to an example of the fourth embodiment of the present invention.

FIG. 12 is a diagram illustrating a method of manufacturing a liquid crystal display panel according to an example of the fourth embodiment of the present invention.

[Explanation of symbols]

2 light sources 4, 6 Polarizer 8 detectors 10 UV lamp 12 Control unit 14 and 15 bonded substrates 16, 16 'glass substrate 18 Aim 20, 21 Sealant 22 Collimating lens 24 Objective lens 26 Liquid crystal inlet 28 Light-shielding film 30 sealing material 32 openings 34 cassettes 36 Arm 38 axes 40 cam 42 arms 46 HeNe laser 48 Photomaru 50 optical fiber

Claims (5)

[Claims] 1. A light source section for irradiating light onto an optical path passing near a desired permeation position of the sealing material when a bonded substrate having a sealing material applied to the liquid crystal injection port is placed thereon, A pair of polarizing plates arranged on the optical path such that their polarization axes are parallel to each other with the laminated substrate placed therebetween, and the intensity of transmitted light transmitted through the pair of polarizing plates is detected. Then, a detection unit that outputs a transmitted light intensity signal, a control unit that outputs a sealing material curing signal based on the transmitted light intensity signal, and a seal that cures the sealing material based on the sealing material curing signal. An apparatus for manufacturing a liquid crystal display panel, comprising: a stop material curing portion. 2. A light source section for irradiating light onto an optical path passing near a desired permeation position of the encapsulation when a bonded substrate coated with a colored encapsulant is placed on the liquid crystal inlet. A detection unit that detects the intensity of transmitted light that has transmitted near the permeation position and outputs a transmitted light intensity signal; a control unit that outputs a sealing material curing signal based on the transmitted light intensity signal; and the sealing material. An encapsulant curing unit that cures the encapsulant based on a curing signal. 3. A transparent substrate that seals liquid crystal together with a counter substrate, a light-shielding film provided on the transparent substrate, the liquid crystal is sealed together with the counter substrate, and a sealing material is applied to a liquid crystal inlet. At this time, a substrate for a liquid crystal display device, which has a light transmitting portion opened in the vicinity of the liquid crystal injection port of the light shielding film to detect a penetration position of the sealing material. 4. A linearly polarized light is radiated onto an optical path passing through the vicinity of a desired permeation position of the encapsulant of a bonded substrate having a liquid crystal injection port coated with the encapsulant and transmitted through the permeation position. A method for manufacturing a liquid crystal display panel, comprising detecting the light intensity of the linearly polarized light component and curing the encapsulant based on the light intensity. 5. A light of a transmitted light which is transmitted through the permeation position by irradiating light on an optical path passing through the vicinity of a desired permeation position of the sealant of a bonded substrate having a liquid crystal injection port coated with a colored sealant. A method for manufacturing a liquid crystal display panel, which comprises detecting the intensity and curing the encapsulant based on the light intensity.