JP3976566B2 - Liquid crystal display element cell, manufacturing apparatus and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display element cell in which the gap accuracy between a pair of opposing substrates constituting the liquid crystal display element cell is improved, and a liquid crystal display element cell manufacturing apparatus and a manufacturing method in which the productivity of the liquid crystal display element cell is improved.
[0002]
[Prior art]
As shown in FIGS. 8 and 9, a conventional TN (twisted nematic) type liquid crystal display element cell 100 has a first electrode substrate 101 and a second electrode substrate 102 bonded to each other with a predetermined gap. On the substrates 101 and 102, a transparent electrode (not shown) made of ITO (indium tin oxide = indium tin oxide) is vapor deposited so as to face each other. Is formed. In a liquid crystal display device capable of dot matrix display, the transparent electrode of an active matrix type liquid crystal display element cell generally has a second electrode substrate as a dot matrix pixel electrode 103 corresponding to a display pixel in the first electrode substrate 101. In 102, the entire display surface is configured as a continuous common electrode 104.
[0003]
The first electrode substrate 101 includes a thin film transistor, a thin film diode, a capacitor, a gate wiring for energizing the pixel electrode 103 and the active element 105, a gate electrode, a drain wiring, a drain as an active element 105 for driving the pixel electrode 103. An electrode, a transfer electrode that is energized with the common electrode 104, a black matrix that blocks incident light other than the display pixel portion, and the like are deposited together with the transparent electrode.
[0004]
On the transparent electrode, an alignment layer 106 made of polyimide resin or a polymer organic film is formed. The surface of the alignment layer 106 is rubbed in one direction with a velvet woven fabric roller such as rayon, cotton, or polyester. Both electrode substrates 101 and 102 are bonded together so that the rubbing-treated alignment layer 106 is opposed. At this time, the electrode substrates 101 and 102 are bonded together so that the gap between the alignment layers 106 forms a gap of 3 to 6 μm, for example. Then, a nematic liquid crystal 107 is sealed in the gap between the bonded electrode substrates 101 and 102.
[0005]
As shown in FIG. 10, it is known that the liquid crystal molecules 108 are aligned along the vector direction of the rubbing process at the boundary with the alignment layer 106 due to the attractive force or repulsive force between the molecules. For example, when the rubbing directions of the facing alignment layers 106 are orthogonal such that the rubbing direction of the first electrode substrate 101 is 45 ° and the rubbing direction of the second electrode substrate 102 is −45 °, the properties of the nematic liquid crystal are obtained. The liquid crystal molecules 108 are arranged in a spiral shape twisted by 90 ° between the first electrode substrate 101 and the second electrode substrate 102. The STN (super twisted nematic) type liquid crystal display device has a twist angle of 180 ° to 270 ° by changing the components of the liquid crystal 107 (see FIG. 9).
[0006]
A polarizing plate 109 is attached to the outside of both electrode substrates 101 and 102. The polarizing plate 109 is attached so that the polarization axis is parallel to the rubbing direction of the alignment layer 106. That is, it is configured such that the polarization axes of the polarizing plates 109 facing each other are orthogonal to each other as in the rubbing direction. For example, in the case of the above example, as shown in FIG. 11, the polarization axis of the first electrode substrate 101 is 45 ° and the polarization axis of the second electrode substrate 102 is −45 °. In FIG. 10, incident light emitted from the backlight 110 is polarized by the polarizing plate 109 of the first electrode substrate 101. The polarized incident light reaches the second electrode substrate 102 while the polarization component rotates due to the spiral molecular arrangement of the liquid crystal 107 (see FIG. 9). Since the polarization axis of the polarizing plate 109 attached to the second electrode substrate 102 is orthogonal to the polarization axis of the polarizing plate 109 of the first electrode substrate 101, the incident light whose polarization component is rotated by 90 ° It can pass through the polarizing plate 109 provided on the electrode substrate 102 and is recognized as white display (FIG. 10A).
[0007]
On the other hand, when a voltage is applied between the pixel electrode 103 (see FIG. 9) of the first electrode substrate 101 and the common electrode 104 (see FIG. 9) of the second electrode substrate 102 as shown in FIG. The liquid crystal molecules 108 are aligned in the direction and become upright. When the liquid crystal molecules 108 rise vertically, the incident light from the backlight 110 goes straight to the second electrode substrate 102 without rotating the polarization component. Since the polarization axis of the polarizing plate 109 of the second electrode substrate 102 and the polarization axis of the incident light are orthogonal, the incident light cannot pass through the polarizing plate 109 and is recognized as a black display.
[0008]
As described above, a white display in a no-voltage state is referred to as a normally white mode, and this mode is frequently used in a liquid crystal display device used as a display device. Note that a black display with no voltage is called a normally black mode, and a liquid crystal display device using this mode is also used. As shown in FIG. 10B, when the voltage to be applied is changed within the voltage range of white display (no voltage) to black display, the tilt angle of the liquid crystal molecules 108 changes according to the voltage. At this time, the transmittance of incident light changes in accordance with the tilt angle of the liquid crystal molecules 108, and intermediate gradation expression between white display and black display becomes possible. For color display, at least one of the electrode substrates 101 or 102 may be colored with RGB (red, green, blue = red, green, blue = light are the three primary colors). In general, the second electrode substrate 102 is often colored.
[0009]
As described above, since the liquid crystal display device depends on the optical characteristics of the liquid crystal 108, making the thickness of the liquid crystal layer (cell gap 114) uniform is important for improving the display characteristics. If the cell gap 114 is not uniform, it causes display unevenness. The narrowing of the cell gap 114 can be regulated by the spacer 111 (see FIG. 9), but the widening of the cell gap 114 can be controlled by pressing both surfaces of the liquid crystal display element cell 100 as in the following conventional example. A “pressure sealing (or pressure sealing)” method has been proposed in which the injection hole 113 is sealed after the liquid is discharged.
[0010]
First, a sealing method described in JP-A-8-220546 (hereinafter referred to as “first conventional example”) will be described with reference to FIGS. 12 and 13.
[0011]
FIG. 12 is a cross-sectional view of the liquid crystal display element cell 100 showing how the thickness of the liquid crystal display element cell 100 (hereinafter referred to as “cell thickness”) changes during the liquid crystal injection process. Reference numeral 111 denotes a spacer for adjusting a gap between the electrode substrates 101 and 102 dispersed in the liquid crystal display element cell 100.
[0012]
12A shows a state in which decompression (deaeration) is completed in a decompression vessel (not shown), and FIG. 12B shows the injection hole 113 of the liquid crystal display element cell 100 in the liquid crystal 107 contained in the liquid crystal boat 200. When contact (dip) is made, FIG. 12 (c) shows that the liquid crystal 107 is half of the entire liquid crystal display element cell 100 in FIG. 12 (e) shows a state in which the liquid crystal 107 has just entered the entire liquid crystal display element cell 100. FIG. 12 (f) shows a state in FIG. g) represents the state when several hours have elapsed from FIG.
[0013]
At the time of FIGS. 12A and 12B, the liquid crystal display element cell 100 is in a convex state, but the injection hole 113 is closed with the liquid crystal 107 as shown in FIG. When the leak starts, the distortion of the electrode substrates 101 and 102 is corrected by the pressure difference between the inside and outside of the liquid crystal display element cell 100, and the cell thickness of the entire liquid crystal display element cell 100 becomes uniform.
[0014]
The liquid crystal 107 enters the entire liquid crystal display element cell 100 by FIGS. 12D, 12E, and 12F, but the liquid crystal 107 continues to enter even at the time of FIG. Due to the restoring force of the electrode substrates 101 and 102, the liquid crystal 107 is sucked into the liquid crystal display element cell 100, and the convex state generated at the time of FIGS. 12A and 12B is restored.
[0015]
When sealing the injection hole 113 of the liquid crystal display element cell 100 having the non-uniform gap in this way with a sealant, the cushion material 201 is placed on each outer surface of the liquid crystal display element cell 100 as shown in FIG. As described above, the gap accuracy is improved by applying a pressure from the outside (metal plate 202).
[0016]
Further, in order to apply a uniform pressure to each outer surface of the liquid crystal display element cell 100, at least one of liquid and gas is sealed inside the solid material 203 having elasticity as the cushion material 201 as shown in FIG. The cushion material having the structure (sealed liquid layer 204) is used.
[0017]
In addition, regarding the press device for a liquid crystal cell and the method for manufacturing the liquid crystal cell (hereinafter referred to as “second conventional example”) described in Japanese Patent Application Laid-Open No. 10-3083, the tact time is reduced in the press device for pressing the LCD cell. In order to shorten the length, an elastic mat that presses the LCD cell disposed on the upper surface of the glass surface plate from above is used, and the sealant is cured while correcting the distortion of both electrode substrates through the elastic mat.
[0018]
Next, a pressure jig according to Japanese Patent No. 3114702 (hereinafter referred to as “third conventional example”) will be described with reference to FIG.
[0019]
In the method using the pressurizing jig, a plurality of seal plates 206 fitted with the seal packing 6 and a plurality of liquid crystal display element cells 100 are alternately stacked. The seal plate 206 is provided with a high-pressure gas supply unit 205, and opens to a pressurizing space 207 formed by the seal plate 206, the liquid crystal display element cell 100, and the seal packing 6. Then, the high pressure gas is fed into the pressurized space 207 through the high pressure gas supply unit 205, and the plurality of front and back surfaces of the liquid crystal display element cell 100 are simultaneously pressed with the pressure of the high pressure gas to correct the cell gap of the liquid crystal display element cell 100. .
[0020]
[Problems to be solved by the invention]
In the first conventional example described above, as shown in FIG. 13, the cushion material 201 is in direct contact with the display surface of the liquid crystal display element cell 100. If it adheres, stress concentrates on the part and causes the liquid crystal display element cell 100 to be damaged. In this regard, the second conventional example also has the same problem because the elastic mat is in direct contact with the display of the liquid crystal display element cell. On the other hand, the third conventional example in which pressurization is performed with a gas pressure is a more preferable pressurization method without the influence of foreign matter.
[0021]
However, in the third conventional example, as shown in FIG. 14, the exhaust path is small and the exhaust amount is insufficient. Therefore, when the seal plate 206 and the liquid crystal display element cell 100 are stacked, the seal packing inserted into the seal plate 206 is used. 6 is elastically deformed, and the volume in the pressurizing space 207 surrounded by the seal packing 6 is reduced, so that the air pressure in the pressurizing space 207 is increased. The pressurization treatment with the high-pressure gas needs to be strictly controlled, but during the stacking operation, the pressurization is unnecessarily suddenly performed, and the spacer particles 11 move between the cell gaps 114 of the liquid crystal display element cell 100. Cause display unevenness. Thereby, there is a problem that the yield rate decreases and the manufacturing cost increases.
[0022]
Further, in the third conventional example, in order to prevent unnecessary pressurization due to an increase in pressure during the stacking operation, the stacking operation must be performed slowly according to the exhaust gas flow rate, resulting in a decrease in productivity. However, there is a problem that the manufacturing cost becomes high.
[0023]
Further, in the third conventional example, when the seal plate 206 and the liquid crystal display element cell 100 are separated after the pressurizing process is completed, the pressure in the pressurizing space is rapidly decreased due to the increase in the volume of the pressurizing space, and the seal is sealed. Since the packing 6 becomes sucker-like and pulls the front and back surfaces of the liquid crystal display element cell 100, it causes the cell gap 114 corrected to an appropriate value to be extended, thereby reducing the yield rate and increasing the manufacturing cost. .
[0024]
In the third conventional example, when the seal plate 206 and the liquid crystal display element cell 100 are separated after the pressurization process is completed, the pressure in the pressurization space decreases due to the increase in the volume of the pressurization space, and the seal packing 6 Becomes sucker-like and pulls the display surface of the liquid crystal display element cell 100, so that the liquid crystal display element cell 100 cannot be easily peeled off from the seal packing 6, thereby reducing the operating rate of the production apparatus and increasing the manufacturing cost. Become.
[0025]
  Therefore, the present inventionThe present invention has been made in view of the problems in the conventional liquid crystal display element manufacturing apparatus, and prevents unnecessary pressurization of the liquid crystal display element cell when the liquid crystal display element cell and the pressure plate are laminated. Liquid crystal display element cell that can improve the yield rate, increase the operating rate of production equipment, and reduce manufacturing costsofAn object of the present invention is to provide a manufacturing apparatus and a manufacturing method, and a liquid crystal display element cell with improved gap accuracy between a pair of opposing substrates.
[0026]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, two substrates are opposed to each other at a predetermined interval, and the display surfaces of the two substrates are pressurized with a gas so that the space between the two substrates is reduced. Drain excess liquid crystal in the formed spaceLiquid crystal display element cellofIn the manufacturing apparatus, the display surface of the liquid crystal display element cell is passed through a gas.Means to pressurizeAnd a seal packing that contacts the outer periphery of the display area of the liquid crystal display element cell, a seal groove that holds the seal packing, and an introduction hole that introduces pressurized gas into the sealed space surrounded by the seal packing. With multiple pressure platesAnd consist ofExhaust gas in the sealed spaceAndGas is sucked into the sealed spaceWith intake and exhaust meansThe aboveIntake and exhaust meansA common gas flow path for communicating the sealed space with the atmosphere is provided.
[0027]
  According to the first aspect of the present invention, when the liquid crystal display element cell and the plurality of pressure plates are stacked, the liquid crystal display element cell, the plurality of pressure plates, and the seal packing are formed. The gasIntake and exhaust meansTherefore, it is possible to prevent the display surface of the liquid crystal display element cell from being unnecessarily pressed due to an unnecessary increase in the air pressure in the sealed space. As a result, the display surface of the liquid crystal display element cell can be pressed with a desired pressing force, the display quality of the liquid crystal display element cell can be improved, the yield rate of good products in production can be improved, and the production cost can be reduced. it can. In addition, when laminating the pressure plate and the liquid crystal display element cell, an increase in the atmospheric pressure accompanying the volume reduction of the sealed space,Intake and exhaust meansTherefore, the push plate can be pushed in approximately 10 seconds in the past, and the time required for the stacking operation, and thus the production of the liquid crystal display element cell can be prevented. Time can be shortened.
[0028]
  Moreover, from the state where a plurality of pressure plates and liquid crystal display element cells are stacked so that both surfaces of the liquid crystal display element cells are sandwiched between pressure plates,After pressurizationWhen separating the pressure plate and the liquid crystal display element cell,Intake and exhaust meansBy sucking the gas into the sealed space, it is possible to prevent the air pressure in the sealed space from being unnecessarily lowered and the display surface of the liquid crystal display element cell from being unnecessarily sucked. As a result, the corrected cell gap can be prevented from being disturbed by the suction force, the display quality of the liquid crystal display element cell can be improved, the yield rate of good products in production can be improved, and the production cost can be reduced. Also, when separating the stacked pressure plate and the liquid crystal display element cell, the pressure drop due to the increase in the volume of the sealed space,Intake and exhaust meansCan be prevented by quickly inhaling, so that the lifting operation of the push plate, which has conventionally been performed over about 5 minutes, can be performed in about 10 seconds, improving the productivity of the liquid crystal display element cell, Production costs can be reduced.furtherSince the seal packing can be prevented from adhering to the liquid crystal display element cell in a sucker shape, there is no mistake in taking out the liquid crystal display element cell from the pressure plate, the operating rate of the production apparatus is improved, and the productivity is improved. .
[0030]
  further,A liquid crystal display element cell manufacturing apparatus having a simple configuration can be provided, in which exhaust and intake can be performed through a common gas flow path that communicates the sealed space with the atmosphere.
[0031]
  The invention according to claim 2 makes two substrates face each other at a predetermined interval,Excess liquid crystal in the space formed between the two substrates is discharged by pressurizing the display surfaces of the two substrates through gas.Liquid crystal display element cellofIn the manufacturing method, a plurality of pressure plates and liquid crystal display element cells are laminated so that both surfaces of the liquid crystal display element cells are sandwiched between the plurality of pressure plates.And before pressurizationA gas in a sealed space formed by the pressure plate, the liquid crystal display element cell, and a seal packing interposed between the pressure plate and the liquid crystal display element cell is exhausted from the sealed space. It is characterized by that.
[0032]
  According to the second aspect of the present invention, when the plurality of pressure plates and the liquid crystal display element cell are stacked, the air pressure in the sealed space is unnecessarily increased and the display surface of the liquid crystal display element cell is unnecessarily pressed. And the cell gap can be corrected under good pressing conditions, which improves the display quality of the liquid crystal display element cell, improves the yield rate of non-defective products, and reduces the production cost. Can be reduced. In addition, the pressure increase due to the volume reduction of the sealed space when laminating the pressure plate and the liquid crystal display element cell,Intake and exhaust meansTherefore, the time required for the stacking operation, and hence the production time of the liquid crystal display element cell can be shortened.
[0033]
  The invention according to claim 3 makes two substrates face each other at a predetermined interval,Excess liquid crystal in the space formed between the two substrates is discharged by pressurizing the display surfaces of the two substrates through gas.Liquid crystal display element cellofIn the manufacturing method, a plurality of pressure plates and liquid crystal display element cells are stacked so that both surfaces of the liquid crystal display element cells are sandwiched between the plurality of pressure plates.After pressurizationWhen separating the plurality of pressure plates from the liquid crystal display element cell, the pressure plate, the liquid crystal display element cell, and a seal packing interposed between the pressure plate and the liquid crystal display element cell; The gas is sucked into the sealed space formed by the above.
[0034]
  Claim3According to the described invention, when the stacked state of the plurality of pressure plates and the liquid crystal display element cell is released, the air pressure in the sealed space is unnecessarily lowered and the display surface of the liquid crystal display element cell is unnecessarily sucked. Therefore, the disorder of the corrected cell gap can be prevented, the display quality of the liquid crystal display element cell can be improved, the yield rate of good products can be improved, and the production cost can be reduced. In addition, since the pressure drop due to the increase in the volume of the sealed space when separating the stacked pressure plate and the liquid crystal display element cell can be prevented, the time required for the lifting operation of the push plate is greatly reduced. The productivity of the cell can be improved and the production cost can be reduced. Furthermore, by preventing the pressure drop due to the increase in volume of the sealed space, the seal packing can be prevented from adhering to the liquid crystal display element cell like a suction cup, and there is no mistake in taking out the liquid crystal display element cell from the pressure plate. , The operating rate of the production equipment is improved, and the productivity is improved.
[0036]
  And according to the invention,When laminating a plurality of pressure plates and liquid crystal display element cells, it is possible to prevent unnecessary pressure on the display surface of the liquid crystal display element cells due to an unnecessarily high pressure in the sealed space. Since the cell gap is corrected under various pressing conditions, a liquid crystal display element cell with good display quality can be obtained.
[0038]
  In addition, in the present invention,When releasing the stacked state of the plurality of pressure plates and the liquid crystal display element cell, it is possible to prevent the display surface of the liquid crystal display element cell from being unnecessarily sucked due to an unnecessarily low atmospheric pressure in the sealed space. Therefore, it is possible to obtain a liquid crystal display element cell with good display quality in which the cell gap is not widened.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Next, the liquid crystal display element cell according to the present inventionofSpecific examples of embodiments of the manufacturing apparatus and the manufacturing method will be described with reference to the drawings.
[0040]
  As shown in FIGS. 1 to 5, the pressing jig 1 used in the liquid crystal display element cell manufacturing apparatus according to the present invention includes a top plate 2, a bottom plate 3, a side plate 4, a push plate 7, a shaft 9, and a pressurization. Plate 5, lock mechanism 10, manifold 18,Intake / exhaust means 19The pressure means 23 and the like.
[0041]
A top plate 2 and a bottom plate 3 made of duralumin (aluminum alloy) having a thickness of 40 mm are connected by a stainless side plate 4 having a thickness of 15 mm and a stainless shaft 9 having a diameter of 12 mm. A bearing 8 is attached to an aluminum pressure plate 5 having a thickness of 12 mm and an aluminum pressing plate 7 having a thickness of 20 mm. The bearing 8 is fitted to the shaft 9 and slides up and down freely.
[0042]
A groove having a width of 4 mm and a depth of 2.5 mm is machined in the pressure plate 5, and an annular seal packing 6 made of an elastic fluoro rubber is attached. The groove processing is performed at a position where the seal packing 6 contacts the outer periphery of the display region 112 of the liquid crystal display element cell 100. The seal packing 6 generally uses an O-ring as described in Japanese Patent Application Laid-Open No. 4-147217. In this embodiment, the present inventor has disclosed Japanese Patent Application No. 2000-029050 and Japanese Patent Application No. It is preferable to use a lip shape which has been proposed in 2001-147898 and has improved sealing properties and peelability.
[0043]
An introduction hole 15 having a diameter of 3 mm is machined in the pressure plate 5, and is conducted from the end surface of the pressure plate 5 to the inner periphery of the seal packing 6. The introduction hole 15 communicates with the manifold 18 via a flexible resin tube 16 having a diameter of 6 mm, and is further connected to the pressurizing means 23.
[0044]
As shown in FIG. 2, the pressurizing means 23 includes a pressurization controller 24, an electropneumatic converter 25, a pressurized gas supply source 26, and the like. The pressurization controller 24 is programmed in advance with the pressure setting of the pressurization gas over time, and the pressure of the pressurization gas supplied from the pressurization gas supply source 26 according to the electric signal from the pressurization controller 24 is set. Then, it is adjusted by the electropneumatic converter 25 and sent into the sealed space 17. In this embodiment, a programmable logic controller is used as the pressure controller 24, but a personal computer or other means may be used. Further, nitrogen is used as the pressurized gas in this embodiment, but compressed air or the like may be used. However, it is desirable to use a clean and inert gas so that the display surface of the liquid crystal display element cell 100 and the atmosphere are not contaminated, corroded or altered.
[0045]
  In the manifold 18,Intake / exhaust means 19Is provided. As shown in FIG.Intake / exhaust means 19Consists of an exhaust valve 20, a spring 21 and the like, and the exhaust valve 20 can be opened and closed by an external action. Since the exhaust valve 20 is pushed up by the action of the spring 21 and closes the exhaust port 22, there is no leakage of pressurized gas from the exhaust port 22. When the protruding end of the exhaust valve 20 is pushed in, it can be exhausted from the exhaust port 22 through the constricted portion of the exhaust valve 20.
[0046]
When the liquid crystal display element cell 100 is inserted between the pressure plates 5 and stacked, the liquid crystal display element cell 100 and the seal packing 6 come into contact with each other to form a sealed space 17. When pressurized gas is fed into the sealed space 17, the display surface of the liquid crystal display element cell 100 can be pressed by the pressure of the pressurized gas. In order to increase the sealing performance of the seal packing 6, the pressing plate 7 is pushed in by an external action, and the pressurizing plate 5 and the pressing plate 7 feed the pressurized gas into the elasticity of the sealing packing 6 and the sealed space 17 by the lock mechanism 10. It is prevented from being pushed back by the expansion of the closed space 17 at that time, and the stacked state of the pressure plate 5 and the liquid crystal display element cell 100 is maintained.
[0047]
The lock mechanism 10 includes an aluminum support 12 having a side of 30 mm, a linear motion guide 11, a tension spring 13, and the like. A linear motion guide 11 that can slide in a reciprocating manner is attached to the push plate 7, and a support column 12 is attached to the linear motion guide 11. The struts 12 are pulled in directions away from each other by the action of the tension spring 13. The top plate 2 is provided with an opening 14 for pulling out the support column 12. When the struts 12 are pulled together by an external action, the struts 12 can be pulled out from the openings 14 of the top plate 2, the push plate 7 is pulled away from the pressure plate 5, and the stacked state of the pressure plates 5 is released. be able to. Further, when the support columns 12 are pulled apart from each other while the push plate 7 is pushed in, the support columns 12 are sandwiched between the top plate 2 and the press plate 7 so that the stacked state of the pressure plates 5 can be maintained.
[0048]
As described above, the materials, physical properties, dimensions, power means, and the like constituting each element are listed as examples, but are not limited thereto, and other materials, dimensions, means, and the like may be used.
[0049]
  Next, a liquid crystal display element cell having the above configurationofThe operation of the manufacturing apparatus will be described.
[0050]
First, as shown in FIG. 1, as an initial state, the support column 12 is pulled by a lock mechanism actuating means (not shown), and the support column 12 is pulled out from the opening 14 of the top plate 2. At this time, the push plate 7 is also pulled up.
[0051]
  Also,Intake / exhaust means 19The exhaust valve 20 is pushed in by an exhaust valve actuating means (not shown), and the exhaust port 22 is open.
[0052]
Next, as shown in FIG. 2, the liquid crystal display element cell 100 is inserted between the pressure plates 5 by manual work or transfer means (not shown). The liquid crystal display element cell 100 is mounted at a position where the seal packing 6 contacts the outer periphery of the display region 112 (see FIG. 8).
[0053]
  Next, as shown in FIG. 3, the support 12 is pulled down by a lock mechanism actuating means (not shown), and the push plate 7 is pushed in. At this time, the seal packing 6 is crushed from a height of 2 mm to 1 mm as shown in FIG. As a result, the volume of the sealed space 17 is halved. Therefore, if the volume of the sealed space 17 remains sealed or the exhaust flow rate is insufficient, the air pressure in the sealed space 17 rises, and the display surface of the liquid crystal display element cell 100 is unnecessarily pressed. End up. Conventionally, since the exhaust gas flow rate is insufficient, the operation of pushing the push plate 7 is performed for about 5 minutes so that the air pressure in the sealed space 17 does not increase. In this example,Intake / exhaust means 19Therefore, the pressure in the sealed space 17 does not increase even if the push plate 7 is pushed in for about 10 seconds.
[0054]
Next, as shown in FIG. 4, when the columns 12 are separated from each other by a lock mechanism actuating means (not shown), the columns 12 are sandwiched between the top plate 2 and the push plate 7. The pressure plate 5 tries to push back the pressing plate 7 due to the elasticity of the seal packing 6, but is regulated by the support column 12, so that the pressing plate 5 and the liquid crystal display element cell are not continuously pressed from the outside. 100 stacked states can be maintained. Since the struts 12 are pulled in directions away from each other by the action of the tension spring 13, the struts 12 do not inadvertently jump out of the opening 14. Then, the exhaust valve 20 is closed by an exhaust valve operating means (not shown).
[0055]
  Next, pressurized gas is sent into the sealed space 17 by the pressurizing means 23. In this embodiment, 0 to 100 kPa of nitrogen was used as the pressurized gas. It is desirable to use a clean and inert gas as the pressurized gas. The pressure control of the pressurized gas is controlled according to the program of the pressure controller 24.Intake / exhaust means 19Since the exhaust valve 20 is closed, the pressurized gas sent into the sealed space 17 is maintained at the pressure set by the pressurization controller 24 without leaking from the exhaust port 22.
[0056]
When pressurized gas is sent into the sealed space 17, both surfaces of the liquid crystal display element cell 100 are pressed with an extremely uniform pressure distribution at atmospheric pressure. By being pressed, the liquid crystal 107 excessively injected into the liquid crystal display element cell 100 is pushed out and oozes out from the liquid crystal injection hole 113 (see FIG. 8).
[0057]
Further, when the pressurized gas is fed into the sealed space 17, the sealed space 17 expands and the pressure plates 5 try to be separated from each other. The state is maintained, and the pressurized gas in the sealed space 17 does not leak to the outside.
[0058]
When the excess liquid crystal 107 is discharged, a sealing agent is applied to the liquid crystal injection hole 113 by a sealing means (not shown) and cured. In general, an ultraviolet curable resin is used as the sealant, and it is cured in a short time by irradiating with ultraviolet rays. As shown in the first conventional example, when the liquid crystal injection hole 113 is sealed after discharging excess liquid crystal, the cell gap 114 can be maintained in a corrected state.
[0059]
  Next, the pressure in the sealed space 17 is returned to atmospheric pressure by the pressurizing means 23,Intake / exhaust means 19The exhaust valve 20 is opened.
[0060]
Next, as shown in FIG. 2, the support column 12 is pulled together by a lock mechanism actuating means (not shown), and the support column 12 is pulled up from the opening 14 of the top plate 2. When the support column 12 is pulled up, the push plate 7 is also lifted up.
[0061]
  When the pressing plate 7 is pulled up, the pressing plates 5 are separated from each other by the elasticity of the squeezed seal packing 6. At this time, since the volume of the sealed space 17 is increased, the pressure in the sealed space 17 is lowered if the volume is kept sealed or if the intake air flow rate is insufficient, and the display surface of the liquid crystal display element cell 100 is unnecessarily pulled. Resulting in. Conventionally, since the exhaust gas flow rate is insufficient, the operation of pulling up the push plate 7 is performed for about 5 minutes so that the air pressure in the sealed space 17 does not decrease. In this example,Intake / exhaust means 19Thus, the air pressure in the sealed space 17 does not drop even if the push plate 7 is lifted in about 10 seconds.
[0062]
In addition, since there is no pressure drop in the sealed space 17, the seal packing 6 does not adhere to the liquid crystal display element cell 100 due to a suction cup shape, so that the liquid crystal display element cell 100 is quickly peeled off from the seal packing 6. Can do.
[0063]
Next, as shown in FIG. 1, the liquid crystal display element cell 100 is extracted from between the pressure plates 5 by manual work or transfer means (not shown).
[0064]
  FIG. 7 shows another embodiment of the pressure jig for the liquid crystal display element cell according to the present invention. In this embodiment, each of the pressure plates 5Intake / exhaust means 19It is equipped with.Intake / exhaust means 19For example, an electromagnetic valve, an air operated valve operated by air pressure, or other similar means can be used.
[0065]
【The invention's effect】
As described above, according to the present invention, the liquid crystal display element cell that can improve the yield rate, increase the operating rate of the production apparatus, and reduce the manufacturing cost.ofA manufacturing apparatus and a manufacturing method can be provided. In addition, a liquid crystal display element cell in which the gap accuracy between the pair of counter substrates is improved can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing an embodiment of a pressurizing jig for a liquid crystal display element cell according to the present invention. In an initial state, the struts are attracted and pulled out from an opening of a top plate. It is sectional drawing which shows a state.
FIG. 2 is a diagram schematically showing an embodiment of a pressure jig for a liquid crystal display element cell according to the present invention, and is a cross-sectional view showing a state in which the liquid crystal display element cell is inserted between pressure plates. is there.
FIG. 3 is a diagram schematically showing an embodiment of a pressurizing jig for a liquid crystal display element cell according to the present invention, and is a cross-sectional view showing a state where a support plate is pulled down by a lock mechanism actuating means and a push plate is pushed in It is.
FIG. 4 is a diagram schematically showing an embodiment of a pressurizing jig for a liquid crystal display element cell according to the present invention, in which struts are separated from each other by a lock mechanism actuating means, and the pressurizing plate and the liquid crystal display element cell It is sectional drawing which shows the state which maintained the lamination state.
FIG. 5 is a perspective view showing an embodiment of a pressure jig for a liquid crystal display element cell according to the present invention.
FIG. 6 is a cross-sectional view showing a change in shape of a seal packing in an embodiment of a pressure jig for a liquid crystal display element cell according to the present invention.
FIG. 7 is a cross-sectional view schematically showing another embodiment of the pressing jig of the liquid crystal display element cell according to the present invention.
FIG. 8 is a perspective view showing a liquid crystal display element cell.
FIG. 9 is a cross-sectional view schematically showing a liquid crystal display element cell.
FIG. 10 is a cross-sectional view schematically showing a change in state of liquid crystal molecules in a liquid crystal display element cell.
FIG. 11 is a perspective view schematically showing a state change of liquid crystal molecules in a liquid crystal display element cell.
FIG. 12 is a cross-sectional view schematically showing a change in the state of the cell gap of the liquid crystal display element cell.
FIG. 13 is a cross-sectional view schematically showing a pressurizing method of a first conventional example.
FIG. 14 is a cross-sectional view schematically showing a pressure jig of a third conventional example.
[Explanation of symbols]
1 Pressure jig
2 Top plate
3 Bottom plate
4 side plate
5 Pressure plate
6 Seal packing
7 Press plate
8 Bearing
9 Shaft
10 Locking mechanism
11 Linear motion guidance
12 props
13 Tension spring
14 opening
15 Introduction hole
16 tubes
17 Sealed space
18 Manifold
19Intake and exhaust means
20 Exhaust valve
21 Spring
22 Exhaust port
23 Pressurizing means
24 Pressurization controller
25 Electro-pneumatic converter
26 Pressurized gas supply source
100 Liquid crystal display element cell
101 First electrode substrate
102 Second electrode substrate
103 pixel electrode
104 Common electrode
105 Active elements
106 Alignment layer
107 liquid crystal
108 Liquid crystal molecules
109 Polarizing plate
110 Backlight
111 spacer
112 display area
113 injection hole
114 cell gap
200 LCD boat
201 Cushion material
202 Metal plate
203 Solid material with elasticity
204 Liquid layer
205 High-pressure gas supply unit
206 Seal plate
207 Pressurized space

Claims (3)

A liquid crystal display element that discharges surplus liquid crystal in a space formed between two substrates by opposing the two substrates at a predetermined interval and pressurizing the display surfaces of the two substrates via a gas in the manufacturing apparatus of the cell, the means for pressurizing via the gas the display surface of the liquid crystal display element cell, and the seal packing in contact with the periphery of the display area of the liquid crystal display element cell, and a seal groove for holding the sealing gasket the constituted by a plurality of pressure plates with the introduction hole for introducing pressurized gas into a closed space surrounded by the sealing packing, and further exhausting gas in the closed space, the gas into the enclosed space provided with a suction exhaust means for sucking, the intake and exhaust means apparatus for producing the liquid crystal display element cell, characterized in that it comprises a common gas flow passage for communicating said enclosed space to the atmosphere. A liquid crystal display element that discharges surplus liquid crystal in a space formed between two substrates by opposing the two substrates at a predetermined interval and pressurizing the display surfaces of the two substrates via a gas in the manufacturing method of the cell, a plurality of pressure plates and the liquid crystal display element cell, both sides of the liquid crystal display element cell are stacked so as to sandwich at the plurality of pressure plate, said pressure plate prior to pressurization, A liquid crystal characterized in that a gas in a sealed space formed by the liquid crystal display element cell and a seal packing interposed between the pressure plate and the liquid crystal display element cell is exhausted from the sealed space. A cell manufacturing method of a display element. A liquid crystal display element that discharges surplus liquid crystal in a space formed between two substrates by opposing the two substrates at a predetermined interval and pressurizing the display surfaces of the two substrates via a gas in the manufacturing method of the cell, a plurality of pressure plates and the liquid crystal display element cell, both sides of the liquid crystal display element cell from a state that is stacked so as to sandwich at the plurality of pressure plate, the plurality after completion pressure When the pressure plate and the liquid crystal display element cell are separated, the pressure plate, the liquid crystal display element cell, and a seal packing interposed between the pressure plate and the liquid crystal display element cell are formed. A method for manufacturing a liquid crystal display element cell , comprising sucking gas into a sealed space.

Images