JP4082910B2 - Manufacturing method of liquid crystal display element - Google Patents

Manufacturing method of liquid crystal display element Download PDF

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Publication number
JP4082910B2
JP4082910B2 JP2002024311A JP2002024311A JP4082910B2 JP 4082910 B2 JP4082910 B2 JP 4082910B2 JP 2002024311 A JP2002024311 A JP 2002024311A JP 2002024311 A JP2002024311 A JP 2002024311A JP 4082910 B2 JP4082910 B2 JP 4082910B2
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Prior art keywords
drawing
closed loop
liquid crystal
portion
substrate
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JP2002024311A
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Japanese (ja)
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JP2003222883A (en
Inventor
信一 真田
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東芝松下ディスプレイテクノロジー株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method and a liquid crystal display element of the liquid crystal display device, and more particularly relates to the production how the liquid crystal display element for forming a liquid crystal layer between the substrates facing to dropping the liquid crystal material to a substrate.
[0002]
[Prior art]
As a method for forming a liquid crystal layer between a pair of substrates, for example, a vacuum injection method or a drop injection method is known.
[0003]
In the vacuum injection method, two substrates are overlapped at a predetermined interval with a frame-shaped sealant having an opening in a part, the seal is cured to form an empty cell, and this empty cell is placed in a vacuum chamber. The inside of the cell is evacuated and the opening of the empty cell is immersed in the liquid crystal material. Then, the pressure in the tank is returned to the atmospheric pressure, and the liquid crystal material is emptied by the difference between the internal pressure of the empty cell and the pressure in the tank. The cell is sucked and filled.
[0004]
However, this method requires a long time of about 7 to 10 hours to inject general-purpose body-type liquid crystal. When the panel size is increased, the cell gap is reduced, or negative-type liquid crystal is injected. There is a further problem that takes a long time.
[0005]
On the other hand, as known in Japanese Patent Application Laid-Open No. Sho 61-260216, the dropping injection method applies a sealant to one substrate in a closed loop shape, and then drops a liquid crystal material into the loop, and the other substrate. The liquid crystal material is spread out to form a liquid crystal layer, and the seal is cured. The main feature is that the liquid crystal layer can be formed in a short time of about 1 hour regardless of the panel size, cell gap, and liquid crystal used. There is. As a closed-loop seal coating method, a method is known in which drawing starts from one of the four corners of the closed-loop seal pattern and finishes drawing at the same location (Japanese Patent Laid-Open Nos. 8-240807 and 10-301122). Issue gazette).
[0006]
[Problems to be solved by the invention]
However, the seal coating method has the following problems. The sealant used in the dropping injection method is generally a high viscosity of about several thousand poises so that it does not dissolve even in contact with the liquid crystal in an uncured state, and it is difficult for the sealant to come out at the beginning of drawing with a dispenser. At the end of the process, the thread is likely to become a stringed state. This is a problem that a seal breakage or seal threading into a loop occurs at the end of drawing and drawing, and display defects are likely to occur.
[0007]
[Means for Solving the Problems]
The present invention, by one of the dispenser on the substrate and the step of applying the sealant in a closed loop, a step of dropping a liquid crystal material in a closed loop, the other on the side of sheet Lumpur agent is formed of one substrate In the method of manufacturing a liquid crystal display element having a process of superposing substrates facing each other, the process of applying a sealant starts drawing from a location outside the closed loop seal pattern and forms a part to be drawn twice This is the process of finishing drawing at a location outside the closed loop seal pattern and at a location different from the location where drawing starts , and when drawing the portion to be drawn twice, drawing of other drawing portions of the closed loop seal pattern is performed. Make the gap between the dispenser and one substrate larger than usual, and make the total amount of sealant applied to the part to be drawn twice the same as the amount of sealant applied to the other part to be drawn. It is a manufacturing method for a liquid crystal display element characterized by that.
[0008]
The present invention also includes a step of applying a sealing agent on one substrate by a dispenser in a closed loop shape, a step of dripping a liquid crystal material in the closed loop, and the other side of the surface on which the sealing agent is formed on one substrate. In the method of manufacturing a liquid crystal display element having a process of superposing substrates facing each other, the process of applying a sealant starts drawing from a location outside the closed loop seal pattern and forms a part to be drawn twice This is the process of finishing drawing at a location outside the closed loop seal pattern and at a location different from the location where drawing starts, and when drawing the portion to be drawn twice, drawing of other drawing portions of the closed loop seal pattern is performed. At that time, change either the application speed or the application pressure of the dispenser, and the total application amount of the sealant in the part to be drawn twice and the application amount of the sealant in the other drawing part It is a manufacturing method for a liquid crystal display device, characterized by the Flip.
[0009]
Furthermore, the present invention relates to a liquid crystal display element having a pair of substrates, a sealant on a closed loop that bonds the pair of substrates, and a liquid crystal material disposed between the pair of substrates and the closed loop. The agent is a liquid crystal display element having an extending part extending from a part of the closed loop to the outside of the closed loop, and the extending part having an end part outside the closed loop.
[0010]
Then, as described above, drawing is started from one outside the closed-loop seal pattern, and drawing is performed at a location outside the closed-loop seal pattern that is different from the location where the drawing is started so that a portion to be drawn twice is formed. Rutotomoni Owa draw begins to draw from outside the auxiliary sealing portion to finished or closed loop seal pattern and said auxiliary seal portion began to draw as twice drawn portion are formed by different auxiliary seal portion , The total application amount of the sealant in the part to be drawn twice , increase the gap between the dispenser and one substrate, or change either the dispenser application speed or the application pressure if the same as the coating amount of, also an external closed loop seal pattern as a seal breakage or stringing occurs, the internal closed loop seal pattern Because does not occur, it can be produced an excellent liquid crystal display device.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(Example 1)
Hereinafter, the present invention will be described in more detail with reference to the drawings.
[0012]
FIG. 1 is a schematic cross-sectional view of a liquid crystal display device using a liquid crystal display element that can be manufactured by a method according to an embodiment of the present invention.
[0013]
The liquid crystal display device 1 of FIG. 1 is a TN (Twisted Nematic) type liquid crystal display device capable of color display. A liquid crystal material 4 is sandwiched between an array substrate 2 and a counter substrate 3 and sealed with a sealant 17. Further, a pair of polarizing plates 5 are fixed and adhered to the surfaces of the array substrate 2 and the counter substrate 3 to constitute a liquid crystal display element.
[0014]
In the array substrate 2, a plurality of switching elements 7 made of thin film transistors are formed on a glass substrate 6, and a color filter layer 8 is formed so as to cover the switching elements 7. The color filter layer 8 has three colors of red R, green G, and blue B. A peripheral light shielding layer 9 is formed on the outer periphery of the display area. Further, a pixel electrode 10 is formed on the color filter layer 8, and the pixel electrode 10 is connected to the switching element 7 through a contact hole formed in the color filter layer 8. Further, a spacer 11 is formed on the color filter layer 8 to keep a distance from the counter substrate 3. An alignment film 12 is formed on the entire surface so as to cover the pixel electrode 10 and the spacer 11.
[0015]
The counter substrate 3 has a common electrode 14 formed on a glass substrate 13 and an alignment film 15 formed thereon.
[0016]
In addition to the liquid crystal display element 1 composed of the array substrate 2 and the counter substrate 3, a light source, a drive circuit, and the like (not shown) are arranged to form a liquid crystal display device.
[0017]
Next, the sealant 17 for bonding the array substrate 2 and the counter substrate 3 and the drawing method thereof will be described in more detail.
[0018]
First, a sealing agent was synthesized by the method shown in the following synthesis example.
[0019]
High purity bisphenol A type epoxy resin: Epicron-850S (Dainippon Ink & Chemicals) 1000 parts by mass (hereinafter abbreviated as "parts"), methacrylic acid: 250 parts, toluene: 900 parts, triethylamine: 2 parts, paramethoxy Phenol: 2 parts were mixed and stirred at 90 ° C. for 8 hours to synthesize a partial addition reaction product.
[0020]
To the reaction product, 4500 parts of toluene was added for dilution, 4500 parts of pure water was added thereto, and the mixture was stirred at room temperature for 1 hour and allowed to stand to separate and remove moisture. This washing operation was repeated 5 times, then with the same amount of 1N NaOH aqueous solution 5 times, and with the same amount of pure water only 5 times, and the solution was filtered and concentrated at 70 ° C. under reduced pressure. Thus, toluene was completely removed, and a partially methacrylic epoxy resin purified product was obtained. The other components of the sealing agent were similarly purified to be highly purified.
[0021]
Subsequently, the raw material was sufficiently kneaded using a paint roll at the following composition ratio to produce a sealant having a viscosity of about 500,000 centipoise.
[0022]
a) Component: 56 parts of partially methacrylated epoxy resin prepared in the above synthesis example
b) Component: 5 parts of BPE4 (Daiichi Kogyo Seiyaku)
c) Ingredients: Escure KIP-150 (Lambberty) 4 parts
d) Ingredients: 10 parts Amicure VDH (Ajinomoto)
e) Ingredient: 24 parts of Ex Oats M-2010 (manufactured by Nippon Steel Chemical)
f) Component: KBM-403 (manufactured by Shin-Etsu Chemical) 1 part
A liquid crystal display panel was produced using the sealing agent and tested for display defects.
[0024]
FIG. 2 shows a large array substrate 200 on which the array substrate 2 for two liquid crystal display elements can be taken. As shown in FIG. 2, on the array substrate 200 (the switching element 7, the pixel electrode 10 and the alignment film 12 are not shown), a sealant starts to be drawn from outside the closed loop seal pattern, and The coating was applied so as to finish drawing at a location (2) outside the closed loop seal pattern different from the location where the drawing started.
[0025]
In the area of the large-sized array substrate 200 in FIG. 2, the thick solid line portion is a closed loop seal pattern, the thin solid line portion is an auxiliary seal for suppressing the deflection of the substrate, and (1) and (3) where drawing has started, (2) and (4) indicate the end of drawing and the drawing order is indicated by arrows. In the main seal part in the vicinity between (1) and (2) and between (3) and (4), which is written twice, the gap between the dispenser and the substrate is 60 μm and the other main seal part. It was made larger than 40 μm to halve the amount of application of one seal, and the total amount of application was the same as other parts. In this embodiment, the total coating amount is made the same as that of the other portions by changing the gap between the dispenser and the substrate, but the coating speed or the coating pressure may be changed, or a combination thereof may be used. .
[0026]
In (1) and (3) , seal breakage due to discharge delay occurred, and in (2) and (4) , stringing occurred, but both were outside the closed loop seal pattern of this seal, and the inside of this seal area is completely problematic. There was no.
[0027]
Subsequently, a liquid crystal was dropped on a region surrounded by the sealing agent on the substrate. Next, this array substrate 200 and a large-sized counter substrate from which the counter substrate 3 corresponding to two liquid crystal display elements can be taken are bonded together in a vacuum, and after returning to atmospheric pressure, the sealant 17 is irradiated with ultraviolet rays and further heated at 120 ° C. After heating for a while to cure the sealant 17, the individual liquid crystal display elements were cut to form and the polarizing plate 5 was attached to complete the liquid crystal display element 1.
[0028]
FIG. 4 shows a plan view of the single liquid crystal display element 1 after being cut. For simplicity, only the outer periphery of the array substrate 2 and the sealant 17 are shown. Finally, the sealant 17 has a pattern having a closed loop and an extending portion 21 extending from a part of the closed loop to the outside of the closed loop, and the extending portion 21 has an end 22 outside the closed loop. ing. The end portion 22 corresponds to the location where the sealing agent 17 is drawn and the location where drawing is completed.
[0029]
The liquid crystal display element was satisfactory without display defects such as bubbles, white spots and cell gap unevenness.
[0030]
(Example 2)
As shown in FIG. 3, drawing is started from the auxiliary seal portion 23, and drawing is finished at the auxiliary seal portion 23 different from the auxiliary seal portion 23 that has started drawing. Others were performed in the same manner as in Example 1. As a result, a good liquid crystal display element was obtained as in Example 1.
[0031]
(Comparative Example 1)
As shown in FIG. 5, when drawing started from one corner of the closed loop seal pattern indicated in (1) and (2) and finished drawing, seal breakage and stringing occurred in this seal part, and the result was obtained. The liquid crystal display element has many display defects due to bubbles and stringed seals.
[0032]
【The invention's effect】
As described above, according to the present invention, a closed-loop seal pattern that is different from the drawing start position so that a portion to be drawn twice is formed , and drawing is started from any one of the closed-loop seal patterns. The auxiliary seal portion that is different from the auxiliary seal portion that has started drawing at the location outside the area or started drawing from the auxiliary seal portion outside the closed loop seal pattern and that has been drawn twice is formed. in drawn Owa Rutotomoni, the total coating amount of the portion of the sealant to be drawn twice, or by increasing the gap between the dispenser and the one of the substrates, to changing either the coating speed and the coating pressure of the dispenser If the coating amount is the same as that in the other drawing portions, a good liquid crystal display element can be manufactured with high productivity by the dropping injection method.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a liquid crystal display device using a liquid crystal display element that can be manufactured by a method according to an embodiment of the present invention.
FIG. 2 is a schematic plan view showing a drawing state of a sealing agent in Example 1 of the present invention.
FIG. 3 is a schematic plan view showing a drawing state of a sealing agent in Example 2 of the present invention.
FIG. 4 is a schematic plan view showing a sealant pattern of a liquid crystal display element in an embodiment of the present invention.
FIG. 5 is a schematic plan view showing a drawing state of a sealant of a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal display element 2 Array substrate 3 Opposite substrate 4 Liquid crystal material
17 sealant
23 Auxiliary seal

Claims (3)

  1. Applying a sealing agent in a closed loop on one substrate by a dispenser ;
    Dropping a liquid crystal material into the closed loop;
    In the method of manufacturing a liquid crystal display element, comprising the step of opposing and overlapping the other substrate on the surface side of the one substrate on which the sealant is formed,
    The step of applying the sealant begins to draw from a location outside the closed loop seal pattern, and begins to draw at a location outside the closed loop seal pattern so that a portion to be drawn twice is formed; This is a step of finishing drawing at different places, and when drawing the portion to be drawn twice, the gap between the dispenser and the one substrate is made larger than when drawing the other drawing portion of the closed loop seal pattern. And the manufacturing method of the liquid crystal display element characterized by making the total application quantity of the sealing agent in the part drawn twice said sealant application quantity in the said other drawing part .
  2. Applying a sealing agent in a closed loop on one substrate by a dispenser;
    Dropping a liquid crystal material into the closed loop;
    In the method of manufacturing a liquid crystal display element, comprising the step of opposing and overlapping the other substrate on the surface side of the one substrate on which the sealant is formed,
    The step of applying the sealant starts drawing from a location outside the closed loop seal pattern, and places a location outside the closed loop seal pattern and starts drawing so that a portion to be drawn twice is formed. It is a step of finishing drawing at different places, and when drawing the portion to be drawn twice, any one of the drawing speed of the dispenser and the coating pressure when drawing the other drawing portion of the closed loop seal pattern To make the total amount of the sealant applied in the portion to be drawn twice equal to the amount of sealant applied in the other drawing portion.
    A method for producing a liquid crystal display element.
  3. Further comprising an auxiliary seal part outside the closed loop and connected to the closed loop on the one substrate,
    3. The method of manufacturing a liquid crystal display element according to claim 1, wherein the drawing starts from the auxiliary seal portion, draws the closed loop continuously, draws the auxiliary seal portion continuously, and finishes a series of drawing. .
JP2002024311A 2002-01-31 2002-01-31 Manufacturing method of liquid crystal display element Active JP4082910B2 (en)

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KR100672641B1 (en) * 2002-02-20 2007-01-23 엘지.필립스 엘시디 주식회사 Liquid Crystal Display Device and Method of manufacturing the same
USRE46146E1 (en) 2002-02-20 2016-09-13 Lg Display Co., Ltd Liquid crystal display device and method of manufacturing the same
JP4500031B2 (en) * 2003-09-30 2010-07-14 芝浦メカトロニクス株式会社 Liquid member dropping device and liquid member dropping method
TW594303B (en) * 2003-11-03 2004-06-21 Chi Mei Optoelectronics Corp Liquid crystal display cell and method for manufacturing the same
US7505108B2 (en) 2004-09-02 2009-03-17 Nano Loa, Inc. Liquid crystal material filling method and liquid crystal material filling apparatus
KR101066487B1 (en) 2004-09-24 2011-09-21 엘지디스플레이 주식회사 Method for Forming Seal Pattern in Tiling Liquid Crystal Display Device
JP4196944B2 (en) 2004-12-27 2008-12-17 セイコーエプソン株式会社 Manufacturing method of liquid crystal device
JP4389780B2 (en) 2004-12-27 2009-12-24 セイコーエプソン株式会社 Method for manufacturing liquid crystal device, liquid crystal device, and electronic apparatus
JP4830296B2 (en) * 2004-12-27 2011-12-07 セイコーエプソン株式会社 Method for manufacturing liquid crystal device, liquid crystal device, and electronic apparatus
JP4645316B2 (en) * 2005-06-17 2011-03-09 エプソンイメージングデバイス株式会社 Manufacturing method of liquid crystal device
JP4966639B2 (en) * 2006-12-18 2012-07-04 パナソニック液晶ディスプレイ株式会社 Liquid crystal display device and manufacturing method thereof
JP5309481B2 (en) 2007-06-15 2013-10-09 セイコーエプソン株式会社 Manufacturing method of electro-optical device
JP5053454B2 (en) * 2011-09-30 2012-10-17 パナソニック液晶ディスプレイ株式会社 Manufacturing method of liquid crystal display device
CN103293773B (en) * 2012-09-24 2016-02-17 上海中航光电子有限公司 Border adhesive coating method, a motherboard, a liquid crystal display panel and a method of preparation, a liquid crystal display device
CN104007582B (en) * 2014-04-29 2016-07-06 京东方科技集团股份有限公司 The method of coating the substrate and adhesive border motherboard

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