JP4387052B2 - Manufacturing method of liquid crystal display device - Google Patents

Manufacturing method of liquid crystal display device Download PDF

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Publication number
JP4387052B2
JP4387052B2 JP2000314130A JP2000314130A JP4387052B2 JP 4387052 B2 JP4387052 B2 JP 4387052B2 JP 2000314130 A JP2000314130 A JP 2000314130A JP 2000314130 A JP2000314130 A JP 2000314130A JP 4387052 B2 JP4387052 B2 JP 4387052B2
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Japan
Prior art keywords
liquid crystal
crystal display
display device
frame pattern
substrate
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JP2000314130A
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JP2002122870A (en
Inventor
公昭 中村
琢也 吉見
英昭 津田
国広 田代
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シャープ株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device obtained by dropping a liquid crystal in a frame pattern formed by forming an ultraviolet curable resin or an ultraviolet ray + thermosetting resin on a substrate, bonding the upper and lower substrates, and curing the resin, and a manufacturing method thereof, The present invention also relates to a liquid crystal dropping device for performing the above-described dropping injection method.
[0002]
[Prior art]
Conventionally, when a liquid crystal display panel is manufactured, a method of injecting liquid crystal into a panel from an injection port provided in a sealed cell is used in a liquid crystal injection process. Recently, there is a high demand for a large screen of a liquid crystal display panel, and it is becoming difficult to obtain sufficient display characteristics with this method.
[0003]
Therefore, a frame pattern is formed by applying a sealing agent made of ultraviolet curable resin or (ultraviolet ray + heat) curable resin to the periphery of the image display area of the cell substrate, and liquid crystal is dropped into the frame pattern to drop each substrate. Attention has been focused on the dropping injection method of bonding the two. This dripping injection method significantly reduces the time and simplification of the panel forming process including the liquid crystal injecting process, enables the production of a low-cost and highly reliable liquid crystal display panel, The liquid crystal display panel produced by using this method has the advantages of a very high contrast ratio from the front, excellent visual characteristics, and good black and white responsiveness. It is suitable to apply.
[0004]
[Problems to be solved by the invention]
As described above, the liquid crystal injection by the dropping injection method has an extremely excellent effect on the manufacturing process and the display characteristics of the product, but has various problems to be improved as described below.
[0005]
See FIG.
In the dropping injection method, since the injection port is not required for the cell (substrate 101), the main seal 102 has a closed frame pattern, but when a closed frame pattern is formed using a dispenser, the start and end points of the seal application overlap, In that portion 103, the seal width is increased. A light shielding film 105 is formed in the periphery of the display area, and when the seal width is increased, a part of the sealing agent is shielded from light and a curing failure occurs (FIG. 23A). For this reason, in the prior art, the main seal 102 is sufficiently separated from the light-shielding film so that the sealant is not shielded from light, or the seal coating start point and end point are made into corner portions with a large margin (see Japanese Patent Laid-Open No. 8-240807) ) Has been proposed (FIG. 23B).
[0006]
However, if the main seal 102 is formed sufficiently away from the light-shielding film so that the sealant is not shielded from light, the ratio of the external dimensions to the image display area 104 becomes large. Moreover, if the start point and end point of the seal application are set to the corner portions, the seal agent is certainly less likely to be applied to the light shielding film than the straight portions. However, this is because the distance between the light shielding film and the sealant is about 1.4 times that of the straight line portion. If the bulge of the overlapping portion 103 becomes larger than the distance, the light shielding film is applied to the light shielding film, which also causes poor curing. It will be.
[0025]
As explained above, the drop injection method is a technology that contributes to the efficient production of liquid crystal display panels and the realization of excellent display characteristics, but there are various problems to be improved, and there is a need for future solutions. is there.
[0026]
The present invention has been made in view of the above problems, and provides a method for manufacturing a liquid crystal display device that achieves the following objects.
[0027]
Display unevenness due to a decrease in retention rate that tends to occur due to a sealing agent is suppressed, and a liquid crystal display device is manufactured easily with a high yield using a dropping injection method, thereby realizing a highly reliable liquid crystal display device.
[0030]
[Means for Solving the Problems]
As a result of intensive studies, the inventors have arrived at the following aspects of the invention.
[0031]
In the method for manufacturing a liquid crystal display device according to the present invention, a frame pattern is formed by applying a sealant to a peripheral portion of an image display area provided on one of a pair of substrates, and liquid crystal is dropped into the frame pattern so that each of the liquid crystal display devices is provided. A method of manufacturing a liquid crystal display device by bonding a substrate and curing the sealant, wherein the sealant is applied so that both a start point and an end point of the sealant application are located outside the frame pattern. It is characterized by doing.
Thereby, since the start point and the end point do not overlap on the frame pattern, it is possible to prevent the seal width from increasing on the frame pattern and overlapping the light shielding film.
[0032]
In this case, it is preferable to apply the sealing agent so that at least one of the start point or the end point is located on the non-mounting side of the substrate.
If the point is formed so as to be located outside the frame pattern, a connection pattern that is connected to the frame pattern is required. Since the cutting position of the substrate is different between the upper side and the lower side on the mounting side, if the point is located on the mounting side, the substrates of the cutting part are bonded to each other by the connecting pattern and are difficult to cut. Since the cutting position of the substrate is the same at the upper and lower sides on the non-mounting side, the substrates at the cutting portion are not bonded by the connecting pattern, and the substrate can be easily cut.
[0033]
Furthermore, it is preferable that at least one of the start point or the end point is connected so as to cross the frame pattern and the non-mounting side.
By forming the connection pattern diagonally, it is possible to connect the point and the frame pattern in a form that does not cross the non-mounting side. However, it is difficult to apply the seal in the diagonal direction because it is difficult to control the dispenser means, which is not practical. . If the points and the frame pattern are connected so as to cross the non-mounting side, the connecting pattern can be formed in a straight line, so that the seal application becomes easy.
[0034]
Further, it is preferable that the start point and the end point coincide with each other on the substrate, and a seal pattern by the sealant is continuously formed.
If the seal pattern is continuously formed in the manner of one-stroke writing, the start point and the end point can be eliminated from the frame pattern, and the seal can be easily applied even to a multi-sided substrate.
[0035]
In the liquid crystal display device and the manufacturing method thereof according to the present invention, a frame pattern is formed by applying a sealant to the periphery of an image display area provided on one of a pair of substrates, and the liquid crystal is dropped into the frame pattern to drop the liquid crystal. The substrates are bonded to each other, and the sealant is cured to target a liquid crystal display device, and the pair of substrates are electrically connected by a transfer seal formed by mixing particles coated with a transparent conductive film on the surface. To do.
[0036]
Among transparent conductive films, for example, ITO film has a larger resistance than nickel or gold conventionally used as a conductive film, but is widely used in liquid crystal display panels as a transparent electrode. It doesn't matter. Although UV light is partially absorbed by the ITO film and attenuates, the metal film has the highest transmittance. By mixing this with the transfer seal, the UV light can easily reach the inside of the seal, which facilitates hardening of the transfer seal. It becomes.
[0037]
In the liquid crystal display device and the manufacturing method thereof according to the present invention, a frame pattern is formed by applying a sealant to the periphery of an image display area provided on one of a pair of substrates, and the liquid crystal is dropped into the frame pattern to drop the liquid crystal. In order to conduct the liquid crystal display device by bonding each substrate and curing the sealing agent, the conductive resin is mixed with the resin, and the resin is mixed with the resin under the transfer seal. It is characterized in that a film reflecting ultraviolet rays irradiated to cure the film is formed.
[0038]
As a result, a part of the ultraviolet rays irradiated to the transfer seal can be reused by the reflective film, so that the amount of light for curing the transfer seal can be suppressed to a smaller level than before.
[0039]
In this case, it is preferable that an aluminum film or a silver film is used as the film that reflects the ultraviolet light and is formed on the substrate on the thin film transistor side.
If it is an aluminum film or a silver film, it reflects an ultraviolet ray and is a metal film widely used in the TFT process, so that a reflective film can be formed without increasing the number of processes.
[0040]
In the method for manufacturing a liquid crystal display device according to the present invention, a frame pattern is formed by applying a sealant to the periphery of an image display area provided on one of a pair of substrates, and liquid crystal is dropped into the frame pattern to drop each of the above. In order to cure the resin in a transfer seal formed by mixing conductive particles in a resin in order to connect a pair of substrates and cure the sealant to cure the liquid crystal display device. In addition, it is characterized in that ultraviolet rays made of parallel light are spot-irradiated from the substrate vertical direction or oblique direction.
[0041]
Spot irradiation can irradiate parallel light with high straightness by using a light guide made of quartz fiber or the like.
Since the transfer seal contains conductive particles that absorb or reflect part or all of the ultraviolet rays, the ultraviolet rays that reach the transfer seal are attenuated by the particles. Further, the transfer seal is sandwiched between transparent electrodes, and this also attenuates ultraviolet rays. If the transfer seal is spot-irradiated with ultraviolet rays composed of parallel light from the vertical direction or the oblique direction of the substrate, it is possible to additionally irradiate only the transfer seal with the attenuated ultraviolet rays. In addition, since parallel light can be irradiated, it is possible to minimize deterioration of the liquid crystal due to the wraparound of light.
[0042]
In the method for manufacturing a liquid crystal display device according to the present invention, a frame pattern is formed by applying a sealant to the periphery of an image display area provided on one of a pair of substrates, and liquid crystal is dropped into the frame pattern to drop each of the above. Applying a transfer seal in which conductive particles are mixed into the resin to cure the resin in order to connect the pair of substrates by bonding the substrates and curing the sealing agent. Therefore, after curing this by ultraviolet irradiation, the substrate is heat-treated in a state where the substrate is held in parallel by a supporting housing after the ultraviolet irradiation.
[0043]
Rather than the conventional transfer cassette that supports the substrate at the edge of the substrate, the substrate is held in parallel by a transfer cassette or parallel plate with a structure that holds the substrate in parallel by supporting multiple points on the substrate surface. The occurrence of misalignment at is suppressed.
[0044]
In the method for manufacturing a liquid crystal display device according to the present invention, a frame pattern is formed by applying a sealant to the periphery of an image display area provided on one of a pair of substrates, and liquid crystal is dropped into the frame pattern to drop each of the above. Targeting a liquid crystal display device by laminating a substrate and curing the sealing agent, a liquid crystal alignment film is formed in a region where the end portion is on the inner periphery outside and the outer periphery inner side of the sealing agent, and is approximately 300 nm or more The sealing agent is cured by irradiating light having a wavelength of less than 500 nm.
[0045]
The photolysis of the liquid crystal occurs at a short wavelength of less than about 320 nm, and the curing of the resin requires a wavelength of not less than 300 nm and less than 320 nm. A device to irradiate the wavelength is required. However, it is difficult in reality, and even if the cut filter is used as a mask and alignment is performed for each liquid crystal display panel, the above-described problem occurs, which is not preferable. Therefore, a device is devised to attenuate the wavelength of 300 nm or more and less than 320 nm within a range where the reaction rate of the resin is not lowered so much that the photolysis of the liquid crystal is minimized.
[0046]
The resin reaction rate was measured by irradiating the resin with ultraviolet rays of a curing light amount using edge filters having different transmittances at wavelengths of 300 nm or more and less than 320 nm. As a result, it was found that although there was a slight difference depending on the resin used, the reaction rate hardly decreased if the transmittance at that wavelength was about 30% when seen at the 313 nm emission line peak of the high pressure mercury lamp. This is because the curing light amount is an ultraviolet light amount at which the reaction rate of the resin almost reaches saturation, but the curing reaction of the resin suddenly rises at about 30% of the curing light amount, and the reaction rate does not vary greatly thereafter. .
[0047]
However, when this filter was used to irradiate the liquid crystal with the same amount of ultraviolet light, the photolysis of the liquid crystal was still large, and display failure occurred due to a decrease in the retention rate. Therefore, the liquid crystal was irradiated with the same amount of ultraviolet rays by cutting a long wavelength of 500 nm or longer, which has little influence on the curing of the resin. As a result, the photolysis of the liquid crystal was reduced, and display defects due to a decrease in the retention rate did not occur. This is because the long wavelength of 500 nm or more alone does not cause the photolysis of the liquid crystal, but when combined with the wavelength of 300 nm or more and less than 320 nm, the long wavelength of 500 nm or more becomes a heat source and the photolysis of the liquid crystal is promoted. It is.
[0048]
The reason why the alignment film edge is formed in the inner peripheral outer side and outer peripheral inner side of the resin is that the alignment film absorbs uncured components of the resin and suppresses diffusion into the liquid crystal. In addition, if the alignment film edge is formed flush with the inner periphery of the resin, a gap is generated between the alignment film edge and the resin due to the displacement, and if the alignment film edge is formed outside the outer periphery of the resin, the moisture resistance is increased. This is because the resin and the substrate are bonded to each other through an alignment film having weak properties, and thus the adhesive strength is remarkably lowered under high temperature and high humidity. In addition, since the alignment film attenuates the wavelength of the 313 nm emission line peak by about 15%, it can be used as a filter for relaxing the photolysis of the liquid crystal. Thereby, since the wavelength transmittance of the filter used for the irradiation light source can be increased, the resin on the outer side of the alignment film can be hardened more firmly.
[0049]
Therefore, by combining the above methods, the photodecomposition of the liquid crystal can be minimized without significantly reducing the reaction rate of the resin, so that display defects due to a decrease in the retention rate do not occur.
[0050]
In this case, at least an end portion of the alignment film on the substrate on which the color filter is formed is formed in a region which is an inner peripheral outer side and an outer peripheral inner side of the sealing agent, and the light of the wavelength is irradiated from the substrate side. It is preferable to cure the sealing agent.
[0051]
This color filter serves as a mask for the image display area. If the edge of the alignment film on the substrate is formed in the region and light is irradiated from the substrate side, it is not necessary to mask the region other than the resin region.
[0052]
Further, at least the transparent electrode on the substrate on which the color filter is formed and the alignment film are formed so that each end portion exists in a region which is an inner peripheral outer side and an outer peripheral inner side of the sealing agent, and the substrate side It is preferable to cure the sealing agent by irradiating light of a wavelength.
[0053]
The transparent electrode film attenuates the wavelength of the 313 nm emission line peak by about 35%, and when used in combination with the alignment film, attenuates the wavelength by about 45%. Therefore, the transparent electrode film is used as a filter for relaxing the photolysis of liquid crystal. As a result, the wavelength transmittance of the filter used for the irradiation light source can be further increased, so that the resin on the outer side of the transparent electrode and the alignment film can be hardened more firmly.
[0054]
Further, as a means for irradiating light having a wavelength of approximately 300 nm or more and less than 500 nm, it is preferable to dispose a filter that substantially cuts other than the wavelength on the irradiation light source side.
[0055]
In the above-described known example, a filter that cuts off ultraviolet rays having a specific wavelength or less harmful to the liquid crystal is disposed between the mask and the liquid crystal display panel. When the filter of the present invention is arranged in such an arrangement, the long wavelength cut filter generates heat because it absorbs a long wavelength of 500 nm or more, and the liquid crystal display panel is also heated. If the wavelength of 300 nm or more and less than 320 nm is irradiated while the liquid crystal display panel is heated, the photodecomposition reaction of the liquid crystal is promoted as described above. Therefore, by disposing a long wavelength cut filter on the irradiation light source side, heat transfer to the liquid crystal display panel is prevented. In addition, the short wavelength cut filter often has absorption not only on the short wavelength side but also on the long wavelength side, and is arranged on the irradiation light source side to suppress heat transfer to the liquid crystal display panel.
[0056]
Furthermore, the curing light amount of the sealing agent is approximately 3000 mJ / cm on an I-line basis. 2 The following is preferable.
[0057]
The curing light amount of the resin is set based on the integrated light amount in the wavelength band (about 350 nm ± 30 nm) near the 365 nm emission line (I line) peak where the irradiation intensity of the high-pressure mercury lamp is maximized. If the intensity of the I-line peak is 100, the 313 nm emission line peak is about 60 for the high-pressure mercury lamp and about 30 for the metal halide lamp. Since it becomes broad in the vicinity of the peak, there is not much difference between the two lamps in the integrated light quantity of the wavelength of 300 nm or more and less than 320 nm.
[0058]
The liquid crystal was irradiated with light having a wavelength of approximately 300 nm or more and less than 500 nm, and the amount of ultraviolet light that activates the photolysis of the liquid crystal was determined from the decrease in retention rate. The transmittance of the cut filter used is 50% at the 313 nm emission line peak and 90% at the 365 nm emission line peak. As a result, although there is a slight difference depending on the liquid crystal, the integrated light quantity in the wavelength band near the 313 nm emission line peak (about 310 nm ± 20 nm) is 1000 mJ / cm. 2 It was about. However, since it is difficult to compare with the curing light amount of the resin, it is 3000 mJ / cm when converted to the ultraviolet ray light amount based on the I-line. 2 It will be about. In the present invention, the wavelength of 300 nm or more and less than 320 nm can be attenuated by about 15% by the alignment film, but the guaranteed illuminance variation when ultraviolet rays are irradiated onto a large substrate is usually about ± 15%, Curing light quantity is 3000mJ / cm on I-line basis 2 In the above, since the maximum value portion of the dispersion exceeds this value and the liquid crystal is irradiated with ultraviolet rays, the photolysis of the liquid crystal is activated and the retention rate is reduced. To activate the reaction, more than a certain amount of energy is required. If energy exceeding that amount is applied, the reaction proceeds at an accelerated rate. Does not progress as much as the difference.
[0059]
The liquid crystal dropping device of the present invention comprises a dispenser means for discharging a predetermined amount of liquid crystal, and a measuring means for measuring the discharge amount of the liquid crystal by the dispenser means, the measuring means having an optical sensor, and the dispenser means Integrating signal fluctuation of the optical sensor generated when the liquid crystal discharged from the optical sensor passes through the optical sensor, and measuring the discharge amount of the liquid crystal.
[0060]
Since the amount of liquid crystal discharged from the dispenser means is not accurate only by self-control of the dispenser means, the measuring means is provided, and the amount (volume) of the liquid crystal is measured by scanning the optical sensor with the liquid crystal discharged from the dispenser means. taking measurement. In this case, the output of the optical sensor measures the width of the ejected liquid crystal droplets, and if measured continuously, the change over time in the ejection amount is measured, and if the measurement result is integrated, a value corresponding to the total ejection amount is obtained. can get. This value and the actual discharge amount are measured and compared to obtain a correlation in advance, and the actual discharge amount can be estimated in real time based on the correlation. This makes it possible to accurately control the total discharge amount dropped onto a desired site, and to make the cell thickness uniform even when manufacturing a large-screen liquid crystal panel.
[0061]
In this case, as a specific example of the measuring means, laser light is scanned in a direction substantially perpendicular to the liquid crystal to be ejected, and the output of the laser light is changed by the ejected liquid crystal crossing the laser light and detected by the optical sensor. It is preferable to measure the discharge amount of the liquid crystal. As described above, by using the laser as the irradiation light source, the discharge amount of the liquid crystal can be measured more quickly and accurately.
[0062]
Further, it is preferable to measure the discharge amount of the liquid crystal from at least two directions, or to measure the discharge amount from two directions substantially orthogonal to each other, so that the accuracy of the discharge amount measurement can be expected.
[0063]
Further, it is preferable that the optical sensor is installed at a position within 2 cm from the liquid crystal discharge port of the dispenser means.
[0064]
An optical sensor is provided at the liquid crystal discharge port of the needle of the dispenser means, and when the amount of liquid crystal actually dropped is measured, the liquid droplets are continuously dropped up to about 2 cm from the liquid crystal discharge port, and about 1 cm is most suitable. I found out. This is because, when the discharge distance becomes longer than 2 cm due to the pressure difference between the inside and outside of the needle or the generation of bubbles, the liquid crystal that was continuously discharged becomes discontinuous and the measurement accuracy decreases.
[0065]
The liquid crystal dropping device of the present invention includes a dispenser means for discharging a predetermined amount of liquid crystal, a measuring means for recognizing a liquid crystal droplet shape discharged by the dispenser means, and estimating an actual liquid crystal discharge amount from the shape. It is provided with.
[0066]
Since the amount of liquid crystal discharged from the dispenser means is not accurate only by self-control of the dispenser means, the measuring means is provided to recognize the shape of liquid crystal droplets discharged from the dispenser means, and from this shape to the actual liquid crystal The amount of discharge is estimated. In this case, the correlation between the liquid crystal droplet shape and its amount (volume) is obtained in advance, and the actual discharge amount is estimated based on the knowledge. This makes it possible to accurately control the total discharge amount dropped onto a desired site, and to make the cell thickness uniform even when manufacturing a large-screen liquid crystal panel.
[0067]
In this case, as a specific example of the measuring means, the liquid droplet shape of the liquid crystal is optically recognized, and the actual liquid crystal ejection amount is estimated from the image of the shape.
[0068]
In addition, an optical sensor is provided in the vicinity of the liquid crystal discharge port of the dispenser means, and the optical sensor signal generated when the discharged liquid crystal passes through the optical sensor is used as a trigger signal from the image of the liquid crystal droplet shape. It is also preferable to estimate the discharge amount of the liquid crystal.
[0069]
Further, the dispenser means discharges the liquid crystal by moving the piston in the syringe, and the control of the discharge amount is adjusted by the stroke amount of the piston, and the stroke amount of the piston is determined based on the result of image processing. It is also suitable to be configured to change automatically.
[0070]
Thereby, the estimated value of the discharge amount from the dispenser means measured by the measurement means is fed back to the dispenser means, and the liquid crystal discharge amount can be accurately controlled.
[0071]
The liquid crystal dropping device of the present invention has a plurality of thin tubes, has discharge means for discharging a predetermined amount of liquid crystal from each of the thin tubes, and each tray corresponding to each of the thin tubes of the discharge means, and is received by each of the trays. Measuring means for measuring the weight of each liquid crystal droplet, and supplying the liquid crystal droplet whose weight is measured by the measuring means and whose discharge amount is specified from each of the trays.
[0072]
Since the amount of liquid crystal discharged from the discharge means is not accurate only by self-control of the discharge means, the measurement means is provided, and after receiving the liquid droplets discharged from each thin tube with a receiving pan and measuring the weight of the liquid droplets Drops are supplied from the tray. At this time, the amount of liquid crystal remaining in the tray is measured in advance, and the supply amount is controlled based on this knowledge. This makes it possible to accurately control the total discharge amount dropped onto a desired site, and to make the cell thickness uniform even when manufacturing a large-screen liquid crystal panel.
[0073]
In this case, it is preferable that a water repellent process for repelling the liquid crystal is applied to the portion of the measuring means that contacts the liquid crystal.
Thereby, the remaining of the liquid crystal is prevented as much as possible, and the liquid crystal amount can be supplied more accurately.
[0074]
In the liquid crystal display device and the method of manufacturing the same of the present invention, at least one of the pair of substrates is transparent, a frame pattern is formed on the periphery of the image display region by applying a sealant, and the dielectric constant is included in the frame pattern. Dropping a liquid crystal having negative anisotropy and bonding the substrates together, targeting a vertical alignment type liquid crystal display device in which the sealant is cured, including a liquid crystal compound represented by the following general formula: The liquid crystal material whose carbon number m of the terminal alkyl group is 2 or more is used.
[0075]
[Chemical formula 2]
[0076]
When a liquid crystal material containing a liquid crystal compound of the above general formula having negative dielectric anisotropy and having an even number of carbon atoms m in the terminal alkyl group is used, the specific resistance of the bulk liquid crystal can be kept high. A liquid crystal containing a neutral component having no polar group and containing an even number of m in the above general formula has an initial ratio as compared with a liquid crystal containing the same component and containing an odd number of m. In all of the resistance, the specific resistance after being left at high temperature, and the specific resistance after exposure to ultraviolet rays (UV), good results are obtained for the liquid crystal having an even number of m.
[0077]
Furthermore, among the liquid crystal compounds of the above general formula, it is desirable to use only those having an m number of 2,4.
In general, when the terminal alkyl chain of the liquid crystal compound is long, the liquid crystal viscosity is increased. The liquid crystal compound of the above general formula also has an action of maintaining the nematic phase in a wide temperature range of the mixed liquid crystal even on the low temperature side. In this case, it is preferable to include two or more compounds having different m numbers. Therefore, in order to suppress the increase in the viscosity of the liquid crystal, it is preferable to use a compound having m number of 2 or 4.
[0078]
In the liquid crystal display device and the method of manufacturing the same of the present invention, at least one of the pair of substrates is transparent, a frame pattern is formed on the periphery of the image display region by applying a sealant, and the dielectric constant is included in the frame pattern. The liquid crystal material is a neutral liquid crystal compound having no polarity, intended for a vertical alignment type liquid crystal display device in which liquid crystal having negative anisotropy is dropped and the substrates are bonded together and the sealant is cured. The liquid crystal containing this neutral liquid crystal compound has a high volatility in which the weight ratio decreases by 1% or more when left in a vacuum when dropped, and has a rotational viscosity of 15 compared with a non-volatile neutral liquid crystal compound. % Or lower.
[0079]
By introducing a low-viscosity material for rotational viscosity, the viscosity of the liquid crystal can be reduced by 15% or more from the state before the introduction, and the volatility of the liquid crystal at this time is reduced by 1% or more (volatilization) by weight ratio. Show. Thus, the response speed of the liquid crystal display device can be improved by reducing the viscosity of the liquid crystal material.
[0080]
In this case, the liquid crystal material has a clearing point of 70 ° C. or higher, a dielectric anisotropy Δε of −4.0 ≦ Δε <0, and a refractive index anisotropy Δn of 0.1000 or more. It is preferable that By satisfying these conditions, display characteristics such as luminance (transmittance) and response speed and mass productivity can be improved.
[0081]
Further, it is preferable that these liquid crystal display devices have a multi-domain structure in which the liquid crystal molecules fall in two or more directions. This makes it possible to improve viewing angle characteristics, which is convenient for application to a liquid crystal monitor or the like.
[0082]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments to which the present invention is applied will be described in detail with reference to the drawings.
[0083]
-General configuration of liquid crystal display-
FIG. 1 is a schematic cross-sectional view showing a general main configuration of a liquid crystal display device.
The liquid crystal display device includes a pair of transparent glass substrates 1 and 2 facing each other at a predetermined interval, and a liquid crystal layer 3 sandwiched between the transparent glass substrates 1 and 2.
[0084]
A plurality of pixel electrodes 15 are formed on one transparent glass substrate 1 via an insulating layer 4, and a transparent alignment film 6 a is formed so as to cover the pixel electrodes 5. The color filter 7, the common electrode 8, and the alignment film 6b are sequentially stacked. The alignment films 6 a and 6 b are abutted so as to sandwich the liquid crystal layer 3, and the glass substrates 1 and 2 are fixed. Polarizers 9 and 10 are provided outside the substrates 1 and 2. The pixel electrode 5 is formed together with an active matrix, and in the illustrated example, a data bus line 11 of the active matrix is shown. Note that the electrode may be provided only on one of the substrates (for example, in the IPS mode).
[0085]
Here, when the liquid crystal layer 3 is formed by using the dropping injection method, examples in which various improvements are made on the structure, the manufacturing process, and the liquid crystal dropping device used for the manufacturing will be disclosed as embodiments shown below. .
[0086]
As a method of manufacturing a liquid crystal display device commonly used in each embodiment, an ultraviolet curable resin or an (ultraviolet ray + heat) curable resin is used as a main seal material, a glass substrate A serving as a TFT (thin film transistor) substrate, and a CF ( Color filter) A glass substrate B serving as a substrate is prepared. For example, a frame pattern of a main seal is formed by a dispenser on an image display area of the glass substrate B, and a liquid crystal is dropped into the frame pattern by a dropping injection method. , B are bonded together, and the main seal is cured. Thereafter, the bonded substrates A and B are cut into a TFT substrate + CF substrate state, and a liquid crystal display device is completed through various post-processes.
[0087]
(First embodiment)
FIG. 2 is a schematic plan view showing a state of the glass substrate on which the frame pattern is formed before performing the liquid crystal injection process by the dropping injection method in the present embodiment.
In this example, an ultraviolet resin (for example, product name 30Y-363, manufactured by ThreeBond Co., Ltd.) is used for the main seal 21, and a peripheral pattern of the display display area 23 on the glass substrate 22 side serving as a CF substrate is connected by a dispenser and a frame pattern. Form. The start point 31a and the end point 31b of the overlapping portion 31 are provided at positions on the non-mounting side and outside the frame pattern, and the connecting patterns are formed so as to be adjacent to each other after bonding.
[0088]
The main seal 21 has a seal width of 1 mm, and the corner portion has a radius of 1 mm so that the line width is equal to that of the straight portion. The frame pattern is formed so that the gap between the inner periphery and the light shielding film 23 is 0.5 mm after bonding.
[0089]
Next, by a liquid crystal dropping method, a required amount of liquid crystal is dropped into the frame pattern, the glass substrate 22 and the glass substrate to be the TFT substrate are bonded in a vacuum, and the liquid crystal is injected by opening to the atmosphere.
[0090]
After collectively irradiating ultraviolet rays from the glass substrate 22 side, seal hardening is performed by heat treatment, and this is cut into a predetermined dimension to obtain a liquid crystal display panel. In addition, about the cutting | disconnection of a board | substrate, the glass substrate 22 used as CF board | substrate is performed along the cutting line 32, and the glass substrate used as a TFT substrate is performed along the cutting line 33. FIG.
[0091]
Here, for comparison with the liquid crystal display device of this example, the liquid crystal display device shown in FIG. 23 is manufactured as a comparative example.
[0092]
In Comparative Example 1, a frame pattern is formed by the main seal 102 as shown in FIG. The start point and the end point are provided at positions on the frame pattern, and the frame pattern is connected at the start point and the end point (the overlapping portion 103 is formed). Otherwise, a liquid crystal display panel is obtained in the same manner as in this example.
[0093]
In Comparative Example 2, a frame pattern is formed on the main seal 102 as shown in FIG. The start point and the end point are located on the frame pattern and at a corner, and the frame pattern is connected at the start point and the end point (the overlapping portion 103 is formed). The corner portion is not formed in an arc shape. Otherwise, a liquid crystal display panel is obtained in the same manner as in this example.
[0094]
In this example, since the start point 31 a and the end point 31 b are outside the frame pattern, the overlap between the start point 31 a and the end point 31 b is not formed on the frame pattern, and the main seal 21 of the frame pattern connecting portion does not overlap the light shielding film 23. On the other hand, in Comparative Examples 1 and 2, since the overlapping portion 103 of the start point and the end point is formed on the frame pattern, the main seal 102 of the frame pattern connecting portion overlaps the light shielding film 105. The seal width of the frame pattern connecting portions of Comparative Examples 1 and 2 is 2.6 mm, and the seal width when the main seal 102 is applied twice is 2.0 mm. This is because the dispenser moves in the vertical direction at the start point and the end point, so that the amount of seal application is larger than that of the straight line portion. The connecting portion of the frame pattern of Comparative Example 1 protrudes 0.8 mm toward the inner periphery and the gap between the inner periphery and the light shielding film 105 is 0.5 mm. Therefore, the main seal 102 overlaps the light shielding film 105 by 0.3 mm. In the frame pattern connecting portion of Conventional Example 2, the protrusion amount is the same as 0.8 mm, but the gap between the inner periphery and the light shielding film 105 is increased by 1.4 times, so the overlap between the main seal 102 and the light shielding film 105 is small. 0.1 mm. If the gap between the inner periphery and the light-shielding film is further widened, the overlap between the main seal 102 and the light-shielding film 105 can be eliminated, but this is not appropriate because the ratio of the external dimensions to the image display area is increased (widening of the frame).
[0095]
Even if the start point and the end point are formed apart on the frame pattern, the overlap between the main seal and the light shielding can be eliminated, but the seal width of the frame pattern connecting portion is narrowed and the strength required for the main seal 102 is maintained. It is not appropriate because it cannot be done.
[0096]
The liquid crystal display panels of this example and comparative examples 1 and 2 were subjected to a lighting test. As a result, display unevenness did not occur in this example, but in Comparative Examples 1 and 2, display unevenness occurred due to poor curing of the main seal 102 at the frame pattern connecting portion.
[0097]
As described above, according to the first embodiment, display unevenness due to a decrease in holding power that tends to occur due to a sealant is suppressed, and a liquid crystal display device is easily manufactured with a high yield using a dropping injection method. Thus, a highly reliable liquid crystal display device can be realized.
[0098]
-Modification-
Here, various modifications of the first embodiment will be described.
[0099]
(Modification 1)
In the first modification, a two-chamfered seal pattern as shown in FIG. 3 and a main seal 42 as shown in FIG. 4 are provided at the periphery of the image display area on the glass substrate 22 side serving as a CF substrate by a main seal 41 with a dispenser. A four-chamfer seal pattern is formed.
[0100]
In the two chamfering of FIG. 3, the start point 43a and the end point 43b are connected on the substrate 22 to continuously form a seal pattern as one overlapping portion 43 so that the main seal 41 does not intersect at the frame pattern connecting portion. On the other hand, in the four chamfering of FIG. 4, the start point 44 a and the end point 44 b are connected on the substrate 22 to continuously form a seal pattern as one overlapping portion 44, and the main seal 42 intersects at the frame pattern coupling portion. To do. Otherwise, the liquid crystal display panel is obtained in the same manner as in the first embodiment.
[0101]
In the two chamfering of FIG. 3, the start point 43 a and the end point 43 b are outside the frame pattern, and the main seal 41 does not intersect at the frame pattern coupling portion, so the main seal 41 at the frame pattern connecting portion does not overlap the light shielding film 23. 4, the main seal 42 intersects at the frame pattern coupling portion and the seal width becomes as thick as 2.0 mm, but is narrower than the overlapping portion 44 of the start point 44a and the end point 44b, and the coupling portion is a corner portion. Therefore, the main seal 42 at the frame pattern connecting portion does not overlap the light shielding film 23.
[0102]
Each of the liquid crystal display panels manufactured using the two chamfers of FIG. 3 and the four chamfers of FIG. 4 was subjected to a lighting test. As a result, display unevenness did not occur in both cases.
[0103]
(Modification 2)
The main steps of Modification 2 are shown in FIG. Here, (a) is a schematic plan view of the substrate 22a, (b) is a schematic cross-sectional view in the vicinity of the transfer seal of the substrate 22a, and (c) is a schematic cross-sectional view showing the transfer seal in an enlarged manner.
[0104]
Here, an ITO film is formed on the surface of a resin spacer (for example, trade name Micropearl SP manufactured by Sekisui Fine Chemical Co., Ltd.) to obtain conductive particles 45. The transfer seal 24 uses the ultraviolet curable resin used in the first embodiment, and 1 wt% of the conductive particles 45 are mixed therein. When the attenuation rate of ultraviolet rays by the conductive particles 45 and the transparent electrode 46 was measured, it was found that the amount of light applied to the transfer seal 24 was 10% less than that of the main seal 21.
[0105]
Also, a reflective film 47 serving as an electrode is formed at the formation position of the transfer seal 24 on the TFT substrate side using an aluminum film. The aluminum film is formed together with the TFT film forming process. In the ultraviolet irradiation, a light amount for ultraviolet curing the main seal 21 was collectively irradiated from the substrate 22 side, and then, the transfer seal 24 was spot-irradiated with parallel light using a light guide 48 from the vertical direction of the substrate. The amount of spot irradiation was set substantially equal to the amount of attenuation of ultraviolet rays by the conductive particles 45 and the transparent electrode 46 (Modification 2A) and 2/3 of the attenuation (Modification 2B). Otherwise, the liquid crystal display panel is obtained in the same manner as in the first embodiment.
[0106]
Here, for comparison with the liquid crystal display device of this example, the liquid crystal display device shown in FIG. 24 is manufactured as a comparative example.
In this comparative example, conductive particles (for example, trade name Micropearl NI manufactured by Sekisui Fine Chemical Co., Ltd.) whose surface is coated with nickel are used, and 1 wt% is mixed into the transfer seal 106. Otherwise, a liquid crystal display panel is obtained in the same manner as in Comparative Example 1 of the first embodiment.
[0107]
The liquid crystal display panels according to the modified examples 2A and 2B and the comparative example were each subjected to a lighting test. As a result, no display unevenness occurred in the modified examples 2A and 2B, but in the comparative example, display unevenness due to poor curing occurred in the frame pattern connecting portion (overlapping portion 103) and the transfer seal 106. In Modification 2B, the amount of light applied to the transfer seal 24 is insufficient, but the reflection film 47 reflects the ultraviolet rays to compensate for the shortage, so display unevenness due to poor curing does not occur.
[0108]
If there is a slight margin between the amount of light that deteriorates the liquid crystal and the amount of light that cures the ultraviolet ray of the sealant, a reflective film is formed under the transfer seal 24 without spot irradiation on the transfer seal 24 to reduce the amount of light for batch irradiation. It is also possible to harden the transfer seal 24 with a slight increase.
[0109]
(Modification 3)
In the third modification, as shown in FIG. 6, after the substrates 22 a and 22 b are bonded to each other by curing the sealing material to form the substrate 51, a transfer arm entrance / exit spacer 53 having a structure that supports the substrate 51 at multiple points is provided. The substrate transfer cassette 52 is used to perform heat treatment after the ultraviolet irradiation.
[0110]
On the other hand, as a comparative example, heat treatment after ultraviolet irradiation is performed using a substrate transport cassette 108 having a structure in which the substrate 110 is supported by the conventional substrate edge as shown in FIG.
[0111]
Otherwise, the liquid crystal display panel is obtained in the same manner as in the first embodiment in both the modified example 3 and the comparative example.
[0112]
The liquid crystal display panels according to the modified example 3 and the comparative example were each subjected to a lighting test. As a result, in the third modification, no positional deviation occurred during the heat treatment, but in the comparative example, a positional deviation occurred. In Modification 3, the substrate 51 is supported at multiple points, so that the substrate 51 can be held in parallel. However, in the comparative example, since the substrate 51 is supported only at the end of the substrate, the deflection becomes large at the center of the substrate 108, and the position is during thermal curing. Deviation occurs.
[0113]
(Second Embodiment)
FIG. 7 is a schematic perspective view showing the state of ultraviolet irradiation after performing the liquid crystal injection step by the drop injection method in this embodiment, and FIG. 8 is an enlarged view of the circle C in FIG. It is a schematic sectional drawing which shows.
[0114]
In this example, an ultraviolet curable resin (trade name 30Y-363 / manufactured by ThreeBond Co., Ltd./curing light amount is 2500 mJ / cm on an I-line basis in the main seal. 2 The glass substrate 61 to be the CF substrate and the glass substrate 62 to be the TFT substrate are bonded together and cut out to produce a liquid crystal display panel. In this example, the ultraviolet irradiation process performed when the glass substrates 61 and 62 are bonded together is improved.
[0115]
The end of the alignment film 63 on the glass substrate 61 was formed in a region that is on the inner peripheral outer side and the outer peripheral inner side of the resin.
[0116]
For comparison, as shown in FIG. 9, a liquid crystal display panel in which an end of an alignment film 63 on a glass substrate 61 serving as a CF substrate is formed inside the inner periphery of the resin and a light shielding mask 64 is provided as a conventional example. To do.
[0117]
For ultraviolet irradiation, a high-pressure mercury lamp is used as a light source, and as shown in FIG. 7, a cut filter 64 that hardly transmits a short wavelength of less than 300 nm and a cut filter 65 that does not substantially transmit a long wavelength of 500 nm or more are arranged on the irradiation light source side. Do.
[0118]
As shown in FIG. 10, the transmittance when both filters are combined is 50% at the 313 nm emission line peak and 90% at the 365 nm emission line peak. The amount of ultraviolet light is 2700 mJ / cm on an I-line basis. 2 However, when the variation of the irradiation area was examined, the minimum value portion of the variation was 2300 mJ / cm. 2 The maximum value is 3100 mJ / cm 2 Met.
[0119]
When the transmittance of each of the glass substrate and the glass substrate to which the alignment film was added was measured, the glass substrate (trade name NA35 / NH Techno Glass Co., Ltd./0.7 mm thickness) was 84% at the 313 nm emission line peak, and the alignment film (trade name) JALS-684 / manufactured by JSR / film thickness of 80 nm) was 71%, and it was found that the wavelength was attenuated by about 15% by the alignment film.
[0120]
The liquid crystal (product name: MJ961213 / Merck) is irradiated with ultraviolet rays using the long and short wavelength cut filters 64, 65, and the threshold value of the amount of ultraviolet light that activates the photolysis of the liquid crystal is obtained from the decrease in retention rate. It was. As a result, as shown in FIG. 11, when the ultraviolet ray is irradiated through the glass substrate, the integrated light quantity in the wavelength band (310 ± 20 nm) near the 313 nm emission line peak is 1000 mJ / cm. 2 Degree, 3000 mJ / cm on I-line basis 2 The decrease in the retention rate increased with the degree, and the decrease in the retention rate was small below this. Similarly, when the threshold value of the amount of ultraviolet light that activates the photodecomposition of the liquid crystal using only the short-wavelength cut filter 64 is obtained from the decrease in the retention rate, the value is 1000 to 1500 mJ / cm on the I-line basis. 2 It was found to be less than half of the long / short wavelength cut filter. This is because the liquid crystal is heated by irradiation with a long wavelength of 500 nm or more, and the photolysis reaction of the liquid crystal with a wavelength of 300 nm or more and less than 320 nm is promoted. Therefore, it was found that the photolysis of the liquid crystal is activated because the amount of ultraviolet light transmitted through the alignment film exceeds this value in any part of the irradiation area.
[0121]
In this example, the main seal is cured by applying the long and short wavelength cut filters 64 and 65. On the other hand, in the conventional example, only the short wavelength cut filter is applied (conventional example 1) and the long / short wavelength cut filter is applied (conventional example 2), and the main seal is cured by masking other than the resin with a light shielding mask. Do. When the thus manufactured liquid crystal display panel was subjected to a lighting display inspection, in the conventional example 1, display unevenness due to a decrease in the retention rate in the entire circumference in the vicinity of the main seal corresponds to the maximum value portion of the irradiation area in the conventional example 2. In the vicinity of the main seal, display unevenness due to a decrease in retention rate occurred. This is considered to be caused by the photolysis of the liquid crystal by ultraviolet irradiation.
[0122]
Further, in the conventional examples 1 and 2, a decrease in retention rate occurred in some corner portions. The corner portion is provided with an R (arc) so that the seal width does not become thicker when the seal is applied, so that the distance between the display area and the resin is closer than the peripheral portion. In the conventional example, since an alignment film is provided on the inner peripheral inner side of the resin, if any uncured component remains in the resin, it diffuses into the liquid crystal by heat treatment and reaches the limit of the display area. As a result, it is considered that a decrease in retention rate occurred in some corner portions.
[0123]
On the other hand, in this example, display unevenness due to a decrease in the retention rate that occurred in the conventional examples 1 and 2 did not occur. This is because the photolysis of the liquid crystal is suppressed by the filter and the alignment film, and the elution of the uncured component of the resin is suppressed by the alignment film.
[0124]
As described above, according to the second embodiment, display unevenness due to a decrease in retention rate that tends to occur due to a sealant is suppressed, and a liquid crystal display device is easily manufactured with a high yield using a drop injection method. Thus, a highly reliable liquid crystal display device can be realized.
[0125]
-Modification-
Here, a modification of the second embodiment will be described.
[0126]
In this modification, the transparent electrode end and the alignment film end on the glass substrate 61 are formed in the inner and outer peripheral regions of the resin, and the liquid crystal display panel is manufactured by the same method as in the second embodiment. To do. The irradiation condition of ultraviolet rays is 3200 mJ / cm with respect to the amount of ultraviolet rays based on the I-line. 2 Except for the above, it is the same as in the second embodiment. When the variation of the irradiation area was examined, the minimum value portion of the variation was 2700 mJ / cm. 2 , 3700mJ / cm at maximum value 2 Met.
[0127]
When the transmittance of the glass substrate to which the transparent electrode and the alignment film were added was measured, the glass substrate was 84%, the transparent electrode (ITO / film thickness 1300A) and the alignment film were 46% at the 313 nm emission line peak, and the transparent electrode and the alignment film were aligned. It was found that the wavelength was attenuated by about 45% by the film.
[0128]
Therefore, even in the maximum value portion of the irradiation area, the amount of ultraviolet light transmitted through the transparent electrode and the alignment film is attenuated by the transparent electrode and the alignment film, so that the above threshold value is not exceeded and the photolysis of the liquid crystal is not activated. I understood.
[0129]
When the thus manufactured liquid crystal display panel was subjected to a lighting display inspection, display unevenness due to a decrease in retention rate that occurred in the conventional example did not occur. Further, since the amount of ultraviolet light irradiated to the transparent electrode and the resin outside the alignment belly end is increased, even the lowest value portion of the variation is irradiated more than the curing light amount. The strength was improved by 10%.
[0130]
-Comparative examples 1 and 2-
A liquid crystal display panel is manufactured by the same method as in the second embodiment. Although the ultraviolet irradiation conditions are the same as those in the second embodiment, as shown in FIG. 12, a high-pressure mercury lamp is used as the ultraviolet irradiation light source, and a cut filter 65 that hardly transmits a short wavelength of less than 320 nm is provided on the glass substrate 61. Place on the side.
[0131]
The threshold value of the amount of ultraviolet light that activates the photolysis of the liquid crystal using the short-wavelength cut filter 65 was determined from the decrease in retention rate, and was 3000 mJ / cm on the basis of I-line. 2 It was found that photolysis of the liquid crystal was not activated by irradiation. Therefore, even if there is no filter that attenuates the wavelength of 300 nm or more and less than 320 nm, such as the transparent electrode film or alignment film in this example in the outer peripheral inner side and outer peripheral inner side, the photolysis of the liquid crystal is not activated. I understood.
[0132]
When the liquid crystal display panel thus manufactured (Comparative Example 1) was subjected to a lighting display inspection, display unevenness due to a decrease in retention rate occurred in all stations near the main seal. When the panel was disassembled and the liquid crystal in the vicinity of the main seal was analyzed by gas chromatography, a resin component derived from the main seal was detected.
[0133]
Further, as in a known example, an ultraviolet curable resin was prepared using a photoinitiator having an absorption band on the long wavelength side of 320 nm or longer, and the same comparison was performed using this as a main seal. When the liquid crystal display panel thus prepared (Comparative Example 2) was subjected to a lighting display inspection, display unevenness due to a decrease in retention stroke occurred in a part near the main seal. When the panel was disassembled and the liquid crystal in the vicinity of the main seal was analyzed by gas chromatography, a resin component derived from the main seal was detected to a lesser extent than in Comparative Example 1.
[0134]
This is because when the resin is cured on the long wavelength side of 320 nm or more, the reaction rate of the resin is reduced by the amount of energy compared to the case where a wavelength of 300 nm or more and less than 320 nm is used. It shows that even if the absorption band of the initiator is shifted to the longer wavelength side of 320 nm or more, only the energy absorption efficiency is improved, and the reaction rate of the resin is not comparable.
[0135]
(Third embodiment)
FIG. 13 is a schematic configuration diagram of the liquid crystal dropping device of the present embodiment.
This liquid crystal dropping apparatus includes a dispenser 71 that discharges a predetermined amount of liquid crystal, and a measuring unit 72 that measures the amount of liquid crystal discharged by the dispenser.
[0136]
The dispenser 71 discharges a predetermined amount of liquid crystal from a needle-like discharge portion and drops it into a frame pattern formed on the glass substrate.
[0137]
The measuring means 72 includes a laser device 73 that is an irradiation light source, an optical sensor 74 that senses the laser light emitted from the laser device 73, a data logger 75 that records the output of the optical sensor 74 with respect to time, and the data And a computer 76 for analyzing and displaying the result of recording by the logger 75.
[0138]
In this liquid crystal dropping device, laser light is irradiated from the laser device 73 to the liquid crystal discharged from the dispenser 71, and the result of sensing the laser light crossing the dropped liquid crystal with the optical sensor 74 is recorded by the data logger 75. At this time, the data logger 75 records time-dependent output fluctuations as shown in FIG. 14, for example. The output of the liquid crystal is measured by integrating the output with the computer 76 over time. The computer 76 estimates the weight based on the correlation between the output of the optical sensor 74 and the weight of the liquid crystal prepared in advance.
[0139]
Although only one optical sensor is shown in the illustrated example, two optical sensors are provided to measure the amount of liquid crystal discharged from two directions that are substantially perpendicular to each other, and further provided with an optical sensor in a multifaceted manner. Even if it measures, it is suitable.
[0140]
Furthermore, the dispenser 71 discharges the liquid crystal by moving the piston in the syringe, and the control of the discharge amount is adjusted by the stroke amount of the piston, and the stroke amount of the piston is automatically set based on the result of the image processing. It is also suitable to be configured to change to
[0141]
As shown in FIG. 15, the positional relationship between the dispenser 71 and the optical sensor 74 is that about 1 cm is the most suitable because liquid droplets continuously drop from the liquid crystal discharge port to about 2 cm. It was. This is because, when the discharge distance becomes longer than 2 cm due to the pressure difference between the inside and outside of the needle or the generation of bubbles, the liquid crystal that was continuously discharged becomes discontinuous and the measurement accuracy decreases.
[0142]
The discharge amount was actually measured using this liquid crystal dropping device. At this time, the number of scans is 100,000 times per second, and the total amount of liquid crystal to be dropped is 250 mg. Since the liquid crystal is dropped at 48 locations, the drop amount per time is 5.21 mg. The dispenser 71 was set to discharge this amount.
[0143]
After dropping, the total amount dropped was estimated to be 245 mg from the output of the optical sensor 74 48 times. Therefore, 5 mg was added using a micro syringe.
When the variation in the cell thickness of the liquid crystal display panel thus produced was measured, it was within a fluctuation of about 1%. In this example, since the number of times of scanning the discharged liquid crystal can be very large, even a dispenser having a function of repeating discharge in a short time can sufficiently cope with it.
[0144]
As described above, according to the liquid crystal dropping device of the third embodiment, it is possible to precisely measure and control the liquid crystal dropping amount by the dropping injection method, and appropriately adjust the dropping amount for each dropping portion. It is possible to make the cell thickness uniform and perform highly reliable liquid crystal drop injection with a high yield.
[0145]
-Modification-
Here, various modifications of the third embodiment will be described.
[0146]
(Modification 1)
In Modification 1, as shown in FIG. 16A, the measuring unit 77 is configured to measure the discharge amount from the liquid crystal droplet shape dropped from the dispenser 71 into the frame pattern of the glass substrate.
[0147]
The measuring means 77 calculates the area of the hatched portion of the liquid crystal 79 from the CCD 78 that images the dropped liquid crystal and the output of the CCD 78, as shown in FIG. The computer 76 is configured to estimate the weight based on the correlation with the weight (volume) of the liquid crystal.
[0148]
In the illustrated example, only one CCD is shown. However, in order to further improve the measurement accuracy, a plurality of CCDs may be provided so that the liquid crystal shape can be captured from different directions.
[0149]
(Modification 2)
In the second modification, as shown in FIG. 17A, the measuring unit 81 is configured to measure the discharge amount from the shape of liquid droplets discharged from the dispenser 71 in the air.
[0150]
The measuring means 81 includes a laser device 73 that is an irradiation light source, an optical sensor 74 that senses the laser light emitted from the laser device 73, and a timing at which the optical sensor 74 recognizes the passage of liquid crystal by the laser light. As shown in FIG. 17 (b), the area of the hatched portion of the liquid crystal 79 is calculated from the CCD 78 that images the liquid crystal in the air and the output of the CCD 78, and the area and the weight of the liquid crystal ( And a computer 76 for estimating the weight based on the correlation with the volume.
[0151]
In this case, since the liquid crystal shape can be reliably captured in the air by the CCD 78, high-precision measurement can be performed without being affected by the surface shape of the glass substrate. In the illustrated example, only one CCD is shown. However, in order to further improve the measurement accuracy, it is preferable to provide a plurality of CCDs and capture the liquid crystal shape from different directions.
[0152]
(Modification 3)
As shown in FIG. 18 (a), the liquid crystal dropping device of Modification 3 includes a plurality of thin glass tubes 82, and a metering dropping jig 83 which is a discharge means for discharging a predetermined amount of liquid crystal from each thin tube 82. The measuring and dropping jig 83 includes each receiving tray 84 corresponding to each thin tube 82, and includes measuring means 85 that respectively measure the weight of liquid crystal droplets received by the receiving tray 84. Liquid crystal droplets whose weight is measured by means 85 and whose discharge amount is specified are dropped and supplied into the frame pattern of the glass substrate by rotating each tray 84.
[0153]
As shown in FIG. 18 (b), each thin tube 82 has a structure having a highly water-repellent Teflon coating on the inner surface where the liquid crystal comes into contact, and the liquid crystal is pushed out by an inert gas and discharged. . When the liquid crystal is dropped on the glass substrate, the liquid crystal often remains in each capillary 82, and it is preferable to promote discharge using an inert gas, and the inner surface of each capillary 82 is coated with Teflon. Thus, more effective discharge becomes possible.
[0154]
(Fourth embodiment)
In this embodiment, a liquid crystal material suitable for application to a liquid crystal dropping method is disclosed.
The liquid crystal material of this example includes a liquid crystal compound represented by the following general formula, and the terminal alkyl group has an even number of carbon atoms m of 2 or more.
[0155]
[Chemical 3]
[0156]
When a liquid crystal material containing a liquid crystal compound of the above general formula having a negative dielectric anisotropy and having an even number of carbon atoms m in the terminal alkyl group is used, the specific resistance of the bulk liquid crystal can be kept high. .
[0157]
In this example, a neutral component having no polarity is used as a common matrix, and a liquid crystal a containing an odd number of m in the general formula and an even number of m in the general formula are included. The liquid crystal a ′ was prepared, and the specific resistance values of the bulk liquid crystals were compared for the two liquid crystal materials under the following conditions.
[0158]
In all of the initial specific resistance, the specific resistance after being left at high temperature, and the specific resistance after exposure to ultraviolet rays (UV), better results were obtained when a ′ (m: even number) was used. In particular, after UV exposure, the specific resistance value can be kept high by an order of magnitude, which is very advantageous at the time of UV seal curing in the dropping injection process. These relationships are shown in FIG. Here, liquid crystal A (n = 1, 3) was used as liquid crystal a, and liquid crystal B and liquid crystal C were used as liquid crystal a ′.
[0159]
Furthermore, among the liquid crystal compounds of the above general formula, it is desirable to use only those having an m number of 2,4. In general, when the terminal of the liquid crystal compound becomes longer, the viscosity of the liquid crystal increases and the response speed decreases, which is undesirable for a liquid crystal display device. The liquid crystal compound of the above general formula also has an effect of maintaining the nematic phase in a wide temperature range of the mixed liquid crystal even on the low temperature side. In that case, the m number is preferably 2 or more. Therefore, in order to suppress the increase in the viscosity of the liquid crystal, it is desirable to use a compound having the m number of 2 or 4.
[0160]
It is also necessary to reduce the viscosity of the liquid crystal material and improve the response speed of the liquid crystal display device. In the dropping injection method, the vacuum standing state (including the exhaust time) is extremely short when bonding. Conventionally, the exhaust time which required several hours can be shortened to several minutes. For this reason, liquid crystal has been volatilized in a vacuum in the past, so it has been necessary to adjust the liquid crystal with a liquid crystal compound that suppresses its volatility, but the dripping injection method can also be used for mass production of volatile materials. became.
[0161]
In addition, when a low-viscosity material that lowers the viscosity of the liquid crystal is introduced, the viscosity of the liquid crystal can be reduced by 15% or more with respect to that before introduction (FIG. 21: liquid crystal E → liquid crystal D). It was found that the volatility of the liquid crystal at that time showed a decrease (volatilization) of 1% or more by weight.
[0162]
When the TV characteristics were measured, no significant difference was observed before and after the introduction of the low viscosity material. On the other hand, with regard to response characteristics, it was confirmed that the speed can be increased including halftones, and there is an effect.
[0163]
Also, from the relationship with the specifications of the liquid crystal display device, the clearing point of the liquid crystal material is 70 ° C. or higher, the dielectric anisotropy Δε is −4.0 ≦ Δε <0, and the refractive index anisotropy Δn is When a liquid crystal material of 0.1000 or more is used, it may mean that display characteristics such as luminance (transmittance) and response speed, and mass productivity are improved.
[0164]
Further, in this liquid crystal display device, when a multi-domain structure in which the direction in which the liquid crystal molecules fall is 2 or more, the viewing angle characteristics are excellent and convenient for a liquid crystal monitor or the like.
[0165]
-Experimental example-
An experimental example in which the liquid crystal display device according to the fourth embodiment is manufactured and various display characteristics are examined will be described below.
[0166]
(Experimental example 1)
Using a substrate having an ITO electrode, a brand name JALS-684 (manufactured by JSR) is formed as an alignment film by a spinner, a predetermined spacer (cell thickness: 4.0 μm) is dispersed, and a thermosetting sealant is used. Lamination and empty cells were produced.
[0167]
For these empty cells, the liquid crystal A with the m number = 1, 3 and the liquid crystals B, C with the m number = 2, 4 are injected into each empty cell, sealed, and polarized. The plate was bonded with crossed Nicols to produce a VA cell.
[0168]
As shown in FIG. 20, the voltage holding ratio, the ion density, and the residual DC voltage were measured for each cell, and the difference in electrical characteristics was examined. Liquid crystal A, liquid crystal B, and liquid crystal C have the physical property values shown in Table 1 below. Further, (a) and (b) show the voltage holding ratio, (c) shows the ion density, and (d) shows the residual DC voltage. As a result of the experiment, the electrical characteristics of liquid crystals B and C (m number = 2, 4) were improved compared to liquid crystal A (m number = 1, 3).
[0169]
[Table 1]
[0170]
(Experimental example 2)
The specific resistances of the liquid crystals A, B and C were measured. Initial value of bulk liquid crystal, after UV exposure (100 mW / cm 2 , 60 seconds), after heating (120 ° C., 60 minutes), and after dropping the UV curable resin (contamination dependency), the four conditions were examined. The liquid crystals B and C (m number = 2, 4) obtained results higher than the liquid crystal A (m number = 1, 3) under all conditions. Particularly, the data after UV exposure has a specific resistance value. It was confirmed that there was a big improvement effect that it was one digit higher.
[0171]
(Experimental example 3)
The difference between the liquid crystal D before the introduction of the low-viscosity material and the liquid crystal E after the introduction was examined. The introduced liquid crystal D is a liquid crystal that does not have any problem even if the conventional vacuum dip injection is used. On the other hand, the liquid crystal E has volatility against being left in a vacuum because a low-viscosity material is introduced.
[0172]
As a result of the experiment, as shown in FIG. 21, the liquid crystal E showed a change in weight (decrease) of more than 1% when left for 1 hour, and was confirmed to be sufficiently volatile than the liquid crystal D.
[0173]
A VA cell was fabricated by the same procedure as in the third embodiment except that the spacers were changed (cell thickness: 3.5 μm) using the liquid crystals D and E. The TV characteristics are equivalent. As shown in FIG. 22, as a result of examining the response speed, the liquid crystal E in which the low-viscosity material is introduced is faster than the liquid crystal D in which the low-viscosity material is introduced with respect to all applied voltages. It was confirmed that the effect of speeding up was great in the adjustment region.
[0174]
As described above, according to the fourth embodiment, it is possible to provide a liquid crystal material most suitable for the dropping injection method, thereby suppressing the viscosity of the liquid crystal and reducing the response speed, particularly a halftone high speed. And a liquid crystal display device capable of further improving the display characteristics.
[0175]
Hereinafter, various aspects of the present invention will be collectively described as supplementary notes.
[0176]
(Appendix 1) A sealant is applied to the periphery of an image display area provided on one of a pair of substrates to form a frame pattern, and liquid crystal is dropped into the frame pattern to bond the substrates together, and the seal A method of manufacturing a liquid crystal display device by curing an agent,
The manufacturing method of a liquid crystal display device, wherein the sealing agent is applied so that at least one of a start point or an end point of the application of the sealing agent is located outside the frame pattern.
[0177]
(Additional remark 2) The manufacturing method of the liquid crystal display device of Additional remark 1 characterized by performing the application | coating of the said sealing agent so that at least one of the said starting point or the said end point may be located in the non-mounting side side of the said board | substrate.
[0178]
(Additional remark 3) The manufacturing method of the liquid crystal display device of Additional remark 2 characterized by connecting at least one of the said starting point or the said end point so that the said frame pattern and the said non-mounting side may be crossed.
[0179]
(Additional remark 4) The said start point and the said end point are made to correspond on the said board | substrate, and the sealing pattern by the said sealing agent is formed continuously, The manufacturing method of the liquid crystal display device of Additional remark 1 characterized by the above-mentioned.
[0180]
(Supplementary Note 5) A sealant is applied to the periphery of an image display area provided on one of a pair of substrates to form a frame pattern, and liquid crystal is dropped into the frame pattern to bond the substrates together, and the seal A method of manufacturing a liquid crystal display device by curing an agent,
In order to conduct between the pair of substrates, a transfer seal formed by mixing conductive particles in the resin is irradiated with ultraviolet rays made of parallel light from the vertical or oblique direction of the substrate in order to cure the resin. A method for manufacturing a liquid crystal display device.
[0181]
(Supplementary Note 6) A sealant is applied to the periphery of an image display area provided on one of a pair of substrates to form a frame pattern, and a liquid crystal is dropped into the frame pattern to bond the substrates together. A method of manufacturing a liquid crystal display device by curing an agent,
In order to conduct between the pair of substrates, by applying a transfer seal formed by mixing conductive particles in the resin, to cure the resin and bond the substrates together, after curing this by ultraviolet irradiation,
A method of manufacturing a liquid crystal display device, comprising: heat-treating the substrate in a state where the substrate is held in parallel by a support housing after the irradiation of the ultraviolet rays.
[0182]
(Appendix 7) A frame pattern is formed by applying a sealant around the image display area provided on one of the pair of substrates, and a liquid crystal is dropped into the frame pattern to bond the substrates together. A liquid crystal display device obtained by curing the agent,
A liquid crystal display device, wherein the pair of substrates are electrically connected by a transfer seal formed by mixing particles coated with a transparent conductive film on the surface.
[0183]
(Appendix 8) A frame pattern is formed by applying a sealant around the image display area provided on one of the pair of substrates, and a liquid crystal is dropped into the frame pattern to bond the substrates together. A liquid crystal display device obtained by curing the agent,
A film that reflects ultraviolet rays irradiated to cure the resin is formed as an electrode under a transfer seal that is formed by mixing conductive particles in the resin and that conducts between the pair of substrates. Liquid crystal display device.
[0184]
(Additional remark 9) The manufacturing method of the liquid crystal display device of Additional remark 8 characterized by using an aluminum film or a silver film as a film | membrane which reflects an ultraviolet-ray, and forming in the said board | substrate by the side of a thin-film transistor.
[0185]
(Supplementary Note 10) A sealant is applied to the periphery of an image display area provided on one of a pair of substrates to form a frame pattern, and liquid crystal is dropped into the frame pattern to bond the substrates, and the seal A method of manufacturing a liquid crystal display device by curing an agent,
A liquid crystal alignment film is formed in a region where the end portion is the inner periphery outer side and the outer periphery inner side of the sealing agent, and the sealing agent is cured by irradiating light having a wavelength of approximately 300 nm or more and less than 500 nm. A method for manufacturing a liquid crystal display device.
[0186]
(Additional remark 11) At least the edge part of the alignment film on the substrate on which the color filter is formed is formed in a region on the inner peripheral outer side and the outer peripheral inner side of the sealing agent, and the light of the wavelength is irradiated from the substrate side. The method for manufacturing a liquid crystal display device according to appendix 10, wherein the sealing agent is cured.
[0187]
(Supplementary note 12) The liquid crystal display device according to supplementary note 10 or 11, wherein as a means for irradiating light having a wavelength of approximately 300 nm or more and less than 500 nm, a filter that substantially cuts other than the wavelength is disposed on the irradiation light source side. Production method.
[0188]
(Additional remark 13) The hardening light quantity of the said sealing agent is about 3000 mJ / cm on an I-line basis. 2 The method for producing a liquid crystal display device according to any one of appendices 10 to 12, characterized in that:
[0189]
(Supplementary note 14) Dispenser means for discharging a predetermined amount of liquid crystal;
Measuring means for measuring the discharge amount of the liquid crystal by the dispenser means,
The measurement means includes an optical sensor, and integrates signal fluctuations of the optical sensor generated when the liquid crystal discharged from the dispenser means passes through the optical sensor, and measures the discharge amount of the liquid crystal. Liquid crystal dropping device.
[0190]
(Supplementary Note 15) The measuring means scans the laser beam in a direction substantially perpendicular to the liquid crystal to be discharged, and the discharged liquid crystal crosses the laser light so that the output of the laser light is changed and detected by the optical sensor. 15. The liquid crystal dropping device according to appendix 14, wherein a discharge amount of the liquid crystal is measured.
[0191]
(Supplementary note 16) The liquid crystal dropping device according to supplementary note 14 or 15, wherein the measurement means measures the discharge amount of the liquid crystal from at least two directions.
[0192]
(Supplementary note 17) The liquid crystal dropping device according to supplementary note 16, wherein the measurement unit measures a discharge amount of liquid crystal from two directions substantially orthogonal to each other.
[0193]
(Additional remark 18) The said optical sensor is installed in the position within 2 cm from the liquid-crystal discharge port of the said dispenser means, The liquid crystal dropping apparatus of any one of Additional remarks 14-17 characterized by the above-mentioned.
[0194]
(Supplementary note 19) Dispenser means for discharging a predetermined amount of liquid crystal;
A liquid crystal dropping device comprising: a liquid crystal measuring means for recognizing a liquid crystal droplet shape ejected by the dispenser means and estimating an actual liquid crystal ejection amount based on the shape.
[0195]
(Supplementary note 20) The liquid crystal dropping device according to supplementary note 19, wherein the measurement unit optically recognizes the droplet shape of the liquid crystal and estimates an actual discharge amount of the liquid crystal from an image of the shape.
[0196]
(Supplementary Note 21) An optical sensor is provided in the vicinity of the liquid crystal discharge port of the dispenser means, and a signal of the optical sensor generated when the discharged liquid crystal passes through the optical sensor is used as a trigger signal from a liquid crystal droplet shape image. Item 20. The liquid crystal dropping device according to appendix 20, wherein an actual discharge amount of liquid crystal is estimated.
[0197]
(Appendix 22) The dispenser means discharges the liquid crystal by moving the piston in the syringe, and adjusts the control of the discharge amount by the stroke amount of the piston. The liquid crystal dropping device according to any one of appendices 19 to 21, wherein the stroke amount is automatically changed.
[0198]
(Supplementary Note 23) Discharge means having a plurality of thin tubes and discharging a predetermined amount of liquid crystal from each of the thin tubes;
Each receiving tray corresponding to each thin tube of the discharge means, and each of the receiving means, and measuring means for measuring the weight of liquid crystal droplets received by each receiving tray,
A liquid crystal dropping apparatus, wherein liquid crystal droplets whose weight is measured by the measuring means and whose discharge amount is specified are supplied from the respective trays.
[0199]
(Supplementary note 24) The liquid crystal dropping device according to supplementary note 23, wherein a portion of the measuring means that comes into contact with the liquid crystal is subjected to a water repellent treatment to repel the liquid crystal.
[0200]
(Supplementary Note 25) A pair of substrates, at least one of which is transparent, has a frame pattern formed by applying a sealant around the periphery of the image display area, and a liquid crystal having a negative dielectric anisotropy is formed in the frame pattern. A liquid crystal display device of a vertical alignment type in which the respective substrates are dropped and bonded, and the sealing agent is cured,
A liquid crystal display device comprising a liquid crystal material containing a liquid crystal compound represented by the following general formula, wherein the terminal alkyl group has an even number of 2 or more carbon atoms.
[Formula 4]
[0201]
(Supplementary note 26) The liquid crystal display device according to supplementary note 25, wherein the liquid crystal compound has 2 or 4 carbon atoms in the terminal alkyl group.
[0202]
(Supplementary Note 27) A pair of substrates, at least one of which is transparent, has a frame pattern formed by applying a sealant around the periphery of the image display region, and a liquid crystal having a negative dielectric anisotropy is formed in the frame pattern. A liquid crystal display device of a vertical alignment type in which the respective substrates are dropped and bonded, and the sealing agent is cured,
The liquid crystal material contains a neutral liquid crystal compound having no polarity, and the liquid crystal containing the neutral liquid crystal compound has a high volatility in which the weight ratio is reduced by 1% or more when left in a vacuum when dropped, and is non-volatile. A liquid crystal display device having a rotational viscosity of 15% or more lower than that of the neutral liquid crystal compound.
[0203]
(Supplementary Note 28) The liquid crystal material has a clearing point of 70 ° C. or higher, a dielectric anisotropy Δε of −4.0 ≦ Δε <0, and a refractive index anisotropy Δn of 0.1000 or more. 28. The liquid crystal display device according to appendix 27, wherein
[0204]
【The invention's effect】
According to the present invention, display unevenness due to a decrease in retention rate that is likely to occur due to a sealing agent is suppressed, and a liquid crystal display device is easily manufactured with a high yield by using a dropping injection method, and a highly reliable liquid crystal display device Can be realized.
[0205]
In addition, it is possible to precisely measure and control the amount of liquid crystal dropped by the drop injection method, and adjust the drop amount appropriately for each dropping site to make the cell thickness uniform, thereby dropping the liquid crystal with high yield and high reliability. It is possible to realize a liquid crystal dropping device that performs the above.
[0206]
In addition, by using the most suitable liquid crystal material for the drop injection method, the liquid crystal display device that realizes further improvement in display characteristics by suppressing the viscosity of the liquid crystal and increasing the response speed, especially halftone, is realized. can do.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a general main configuration of a liquid crystal display device.
FIG. 2 is a schematic plan view showing a state of a glass substrate on which a frame pattern is formed before performing a liquid crystal injection step by a dropping injection method in the first embodiment.
FIG. 3 is a schematic plan view showing a main configuration (two chamfering) of a first modification of the first embodiment.
FIG. 4 is a schematic plan view showing a main configuration (four chamfering) of a first modification of the first embodiment.
FIG. 5 is a schematic diagram showing main steps of Modification 2 of the first embodiment.
FIG. 6 is a schematic perspective view showing a substrate transfer cassette according to Modification 3 of the first embodiment.
FIG. 7 is a schematic perspective view showing a state when an ultraviolet ray is irradiated after performing a liquid crystal injection step by a drop injection method in the second embodiment.
8 is a schematic cross-sectional view showing a state of a glass substrate by enlarging a circle C in FIG.
FIG. 9 is a schematic cross-sectional view showing a comparative example of the second embodiment.
FIG. 10 is a characteristic diagram showing the wavelength dependence of transmittance.
FIG. 11 is a characteristic diagram showing a photolysis reaction of liquid crystal.
FIG. 12 is a schematic cross-sectional view showing comparative examples 1 and 2 of the second embodiment.
FIG. 13 is a schematic configuration diagram of a liquid crystal dropping device of a third embodiment.
FIG. 14 is a characteristic diagram showing an output variation depending on time of the optical sensor.
FIG. 15 is a schematic configuration diagram showing a positional relationship between a dispenser and an optical sensor.
FIG. 16 is a schematic configuration diagram showing a first modification of the liquid crystal dropping device of the third embodiment.
FIG. 17 is a schematic configuration diagram showing a second modification of the liquid crystal dropping device of the third embodiment.
FIG. 18 is a schematic configuration diagram showing a third modification of the liquid crystal dropping device of the third embodiment.
FIG. 19 is a characteristic diagram showing an initial specific resistance of a liquid crystal material, a specific resistance after being left at high temperature, and a specific resistance after exposure to ultraviolet rays (UV) in a fourth embodiment.
20 is a characteristic diagram showing the results of measurement of the voltage holding ratio, ion density, and residual DC voltage of each cell in Experimental Example 1. FIG.
FIG. 21 is a characteristic diagram showing the results of examining the difference in volatility between the liquid crystal before introducing the low-viscosity material and the liquid crystal after introducing in Experimental Example 3.
FIG. 22 is a characteristic diagram showing the results of examining the difference in speeding up between the liquid crystal before introducing the low-viscosity material and the liquid crystal after introducing in Experimental Example 3.
FIG. 23 is a schematic view for explaining a problem with a conventional sealing agent.
FIG. 24 is a schematic view for explaining a problem related to a sealing agent in a comparative example.
FIG. 25 is a schematic view for explaining a problem related to a sealing agent in a comparative example.
[Explanation of symbols]
1,2,22 Glass substrate
21, 41, 42 Main seal
23 Shading film
24 Transfer seal
31, 44 Overlapping part
31a Starting point
31b End point
45 Conductive particles
46 Transparent electrode
47 Reflective film
52 Substrate transport cassette
64 Short wavelength cut filter less than 300nm
65 Long wavelength cut filter of 500nm or less
71 dispenser
72, 77, 85 Measuring means
73 Laser equipment
74 Optical sensor
75 data logger
76 computers
78 CCD
82 Thin glass tube
83 Weighing dripping jig
84 saucer

Claims (4)

  1. A sealant is applied to the periphery of the image display area provided on one of the pair of substrates to form a frame pattern, and liquid crystal is dropped into the frame pattern to bond the substrates, and the sealant is cured. A method of manufacturing a liquid crystal display device,
    The manufacturing method of a liquid crystal display device, wherein the sealing agent is applied so that both a starting point and an ending point of the sealing agent application are located outside the frame pattern.
  2. 2. The method of manufacturing a liquid crystal display device according to claim 1, wherein the sealant is applied so that both the start point and the end point are located on the non-mounting side of the substrate.
  3. 3. The method of manufacturing a liquid crystal display device according to claim 2, wherein both the start point and the end point are connected so as to cross the frame pattern and the non-mounting side.
  4. 2. The method of manufacturing a liquid crystal display device according to claim 1, wherein the start point and the end point coincide with each other on the substrate, and a seal pattern by the sealant is continuously formed.
JP2000314130A 2000-10-13 2000-10-13 Manufacturing method of liquid crystal display device Expired - Fee Related JP4387052B2 (en)

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