JP4933892B2 - Manufacturing method of liquid crystal display element - Google Patents

Description

  The present invention relates to a method for manufacturing a liquid crystal display element.

  In general, a liquid crystal display element, as is well known, has two transparent substrates stacked on both sides of a sealing material extending along the periphery, and the inner side of the sealing material between the two transparent substrates. This portion is filled with liquid crystal. Conventionally, the following method has been adopted in manufacturing the liquid crystal display device having this configuration. (See Patent Document 1)

  FIG. 5 is a perspective view showing two material transparent substrates used in the conventional manufacturing method, and FIG. 6 shows a state in which the two material transparent substrates are overlapped to form one material plate in the conventional manufacturing method. 7 is a perspective view showing a state in which the material plate is cut into material plate pieces in the conventional manufacturing method, and FIG. 8 is a perspective view showing a state in which the material plate piece is cut into liquid crystal display elements in the conventional manufacturing method. FIG. 9 is a diagram showing a state in which the liquid crystal display element is filled with liquid crystal. In the drawings, the same components are denoted by the same reference numerals, but description thereof will be omitted once. As shown in FIG. 5, two material transparent substrates 2 and 3 having a size capable of simultaneously manufacturing a plurality of liquid crystal display elements 1 having a width dimension W and a length dimension L are prepared. After the sealing body 4 is formed by screen printing of a liquid synthetic resin or the like on each of the portions of the liquid crystal display elements in the surface of 2, as shown in FIG. The material transparent substrate 3 is overlapped and joined to form a single material plate 5, and then the material plate 5 is cut along a cutting line 6 with respect to both the material transparent substrates 2 and 3, As shown in FIG. 7, after the material plate pieces 7 are divided into narrow material plate pieces 7, the material plate pieces 7 are further cut along the cutting lines 8 with respect to the two material transparent substrates 2 and 3, and one material transparent substrate 2. The cutting line 9A indicated by the alternate long and short dash line, and the other material transparent By each taken along a line 9B shown by the two-dot chain line for only a plate 3, as shown in FIG. 8, a method of dividing each liquid crystal display device 1.

  However, in this conventional manufacturing method, when the sealing body 4 in each liquid crystal display element 1 is formed on the surface of the one material transparent substrate 2, a gap of a dimension S is appropriately provided between the sealing bodies 4. Thus, each seal body 4 is positioned at a position that is half the gap dimension, that is, inside by S / 2 from the outer peripheral surface of the liquid crystal display element 1, and is cut for each liquid crystal display element 1 at the gap portion. There are problems as described below.

  That is, according to the conventional manufacturing method, the seal body 4 is positioned at a position that is half the gap dimension from the outer peripheral surface of the liquid crystal display element 1, that is, a portion that is inside by S / 2. 1 has a problem that the display area on the inner side of the inner periphery of the seal body 4 becomes narrower. In order to enlarge the display area, the width dimension W and the length dimension L of the liquid crystal display element 1 are set as follows. The seal body 4 has to be enlarged by an amount that is located at a portion that enters the inside from the outer peripheral surface, leading to an increase in the size of the liquid crystal display element.

  In addition, as shown in FIG. 9, the liquid crystal display element 1 is filled with the liquid crystal B that is raised in the container A through the injection port 4A provided in a part of the seal body 4 in a vacuum. However, in this case, if the structure is such that the seal body 4 is located at the site inside from the outer peripheral surface, the seal body 4 may be located even outside the seal body 4. Since the liquid crystal enters by capillarity, not only the amount of liquid crystal used is increased, but also the cutting along the cutting line 9A indicated by the one-dot chain line of one material transparent substrate 2 and the other material transparent substrate 3 When the liquid crystal display element 1 is separated by cutting along the cutting line 9B indicated by the two-dot chain line, the liquid crystal that has entered the gap between the seal bodies 4 serves as an adhesive. Easily separated for each liquid crystal display element 1 It is a situation that can not occur, there is also a problem to say that production costs are up become variable.

  In order to solve these problems, Patent Document 1 states that “the liquid crystal display element is formed on the surface of one of the two transparent substrates having a size capable of simultaneously manufacturing a plurality of liquid crystal display elements. A step of forming a sealing body in each of the above, a step of superimposing and joining the other material transparent substrate to the one material transparent substrate to form a single material plate, and Cutting a plurality of liquid crystal display elements along a cutting line between the liquid crystal display elements, wherein the step of forming the seal body comprises cutting the seal body into the cut section It is a step of forming a strip so as to straddle the liquid crystal display elements on both sides across the line, and extending along the cutting line, and further, in the cutting step along the cutting line in the material plate, Above It said sealing member formed on Jo is a manufacturing method "of the liquid crystal display device which is cut into the seal member of each liquid crystal display element.

  By doing so, when forming a sealing body in each of the liquid crystal display elements on the surface of one material transparent substrate, this sealing body is straddled across the liquid crystal display elements on both sides across the cutting line between the liquid crystal display elements. The belt-like seal body is formed so as to extend along the cutting line, while the belt-like seal body is cut into a seal body for each liquid crystal display element. In addition, the inner periphery of each sealing body is brought closer to the outer peripheral surface of the liquid crystal display element than in the conventional case where a gap is provided between the sealing bodies in each liquid crystal display element. It can be done.

  Therefore, the display area on the inner side of the inner periphery of the seal body in the surface of the liquid crystal display element can be widened, and the liquid crystal display element is increased in size by increasing the width and length dimensions of the liquid crystal display element. In addition, since the liquid crystal can be prevented from entering the outside of the sealing body when the liquid crystal is filled, the amount of liquid crystal used can be reduced and the liquid crystal display elements are not separated. Thus, the manufacturing cost can be greatly reduced.

  FIG. 10 is a perspective view showing two material transparent substrates used in the manufacturing method according to the prior art, and FIG. 11 is a state where the two material transparent substrates are overlapped to form one material plate in the manufacturing method according to the prior art. FIG. 12 is a perspective view showing a state in which the material plate is cut into material plate pieces in the manufacturing method according to the prior art, and FIG. 13 is a view in which the material plate piece is cut into liquid crystal display elements in the manufacturing method according to the conventional technology. It is a perspective view which shows a state. A specific manufacturing method will be described with reference to FIGS. In the drawings, the same components are denoted by the same reference numerals, but description thereof will be omitted once. In the figure, reference numerals 12 and 13 denote a transparent substrate made of a soft synthetic resin which is sized so that a plurality of liquid crystal display elements 11 having a width dimension W and a length dimension L can be manufactured at the same time. When the sealing body 14 in each of the liquid crystal display elements 11 is formed on the surface of one of the transparent substrates 12 and 13 by screen printing of a liquid synthetic resin, the sealing body 14 is shown in FIG. As shown in FIG. 10, it is formed in a band shape so as to straddle the liquid crystal display elements 11 on both sides sandwiching the cutting lines 16 and 18 between the liquid crystal display elements 11, and so as to extend along the cutting lines 16 and 18. To do.

  Next, as shown in FIG. 11, the one material transparent substrate 12 is overlaid with the other material transparent substrate 13, and then the synthetic resin of the sealing body 14 is cured to thereby form both the material transparent substrates. 12 and 13 are joined together to form a single material plate 15.

Next, the material plate 15 is cut along the cutting lines 16 and 18 for both the material transparent substrates 12 and 13 to divide the material plate 15 into narrow material plate pieces 17 as shown in FIG. .
When cutting along the cutting lines 16, 18, the strip-shaped sealing body 14 formed along the cutting line 16 is cut into sealing bodies for the respective liquid crystal display elements 11 in the respective material plate pieces 17. To.

  Then, in the state of the material plate piece 17, the liquid crystal is filled from the injection port 14 </ b> A inside each seal body 14 by the method shown in FIG. 9, and then the material plate piece 17 is applied only to one material transparent substrate 12. Each of the liquid crystal display elements 11 is divided as shown in FIG. 13 by cutting along a cutting line 19A indicated by a one-dot chain line and a cutting line 19B indicated by a two-dot chain line for only the other material transparent substrate 13. To do.

  When forming the sealing body 14 in each of the liquid crystal display elements 11 on the surface of one material transparent substrate 12, as described above, the sealing body 14 is provided with the cutting lines 16 and 18 between the liquid crystal display elements 11. A band is formed so as to straddle the liquid crystal display elements 11 on both sides of the sandwich, and is formed so as to extend along the cutting lines 16, 18, while the band-shaped seal body 14 is sealed for each liquid crystal display element 11. As a result of the cutting, the gap between the seal bodies 14 in each liquid crystal display element 11 can be prevented from being formed, and the inner periphery of each seal body 14 can be separated from the liquid crystal display as in the prior art. The liquid crystal display element 11 can be brought closer to the outer peripheral surface than when a gap is provided between the sealing bodies in the element.

  A band is formed so as to straddle the liquid crystal display elements on both sides sandwiching a cutting line between the liquid crystal display elements, and the band-shaped sealing body is formed for each liquid crystal display element. A technique for cutting into a sealing body is also disclosed in Patent Document 2.

Japanese Patent No. 3776614 JP 2006-276579 A

  When the scribing method is used to cut the mother substrate, the seal body cannot be cut well with a structure sandwiching the seal body. In the cutting by the dicing method, the sealing body can be cut, but the cooling liquid used at the time of dicing cutting enters from the liquid crystal inlet of the liquid crystal display element at the dicing cutting line 16 shown in FIG.

at least,
In one of the aligned two mother substrates so that a plurality of liquid crystal display element region are adjacent to each other, the both sides of the switching disconnection of at least one side of the plurality of seal members so as to correspond to the respective liquid crystal display element region A sealing body forming step of forming a strip so as to straddle the liquid crystal display element and extending along the cutting line;
An attaching step of attaching the two mother substrates;
A cutting step of cutting the two mother substrates into a plurality of liquid crystal display elements along a cutting line between the adjacent liquid crystal display elements;
A method of manufacturing a liquid crystal display device comprising:
Said have you the cutting step, wherein in the cutting of the seal body portion across the adjacent liquid crystal display elements, can break the other mother board while cutting all the mother substrate and the sealing member of the hand of the two mother substrates Cut to an appropriate depth,
Wherein in the cutting of non-seal body portion across the adjacent liquid crystal display elements, a method of manufacturing a liquid crystal display device you cut by half-dicing or scribing with the two mother substrates.

The sticking step further includes a step of sticking or sealing the outer periphery of the mother substrate leaving a gas vent hole, and the gas vent hole is a method for manufacturing a liquid crystal display element formed at a position shifted from the cutting line.

Wherein adjacent sealing body other than the cut line across the liquid crystal display device which has an offset portion between the two mother substrates, a seal member extending over the liquid crystal display device wherein adjacent of said offset portion, said adjacent liquid crystal A manufacturing method of a liquid crystal display element which is a seal body that is more easily peeled off than a seal body other than a seal body straddling the display element.

One of said two mother substrates is a transparent substrate, the other is made of a silicon substrate, the cut of the seal body across the liquid crystal display elements adjacent in the cutting step, a liquid crystal display to be disconnected from the transparent substrate side It is set as the manufacturing method of an element.

The sealing body portion straddling the adjacent liquid crystal display element is cut by dicing , and the dicing is performed in a state where the sealing body portion straddling the adjacent liquid crystal display element is cooled .

  Since the seal body portion is shared and the space between them is cut, the loss of the substrate can be reduced. When cutting the sealing body that spans adjacent liquid crystal display elements, the first mother board and the sealing body are all cut, and the second mother board is cut to a depth that allows breakage, so dicing only needs to be done once. Efficiency is good. Further, since the other cut portions cut the respective substrates by half dicing or scribing, the cooling liquid does not enter from the liquid crystal inlet during dicing.

  There is no risk of cutting the vent hole by dicing or scribing, and the cooling liquid does not enter from the liquid crystal inlet during dicing.

  After cutting by dicing, the work of peeling off the substrate at the offset portion becomes easy.

  Since cutting is performed from the transparent substrate side, the cutting position can be clearly understood and cutting accuracy can be improved.

  Dicing at low temperature makes the seal body hard and can be cut cleanly.

  1A is a top perspective view in which two mother substrates according to the present invention are bonded together, FIG. 1B is a perspective view of a liquid crystal display element after cutting, and FIG. 2 is a partially enlarged view of FIG. FIG. 3 is a cross-sectional view showing a cut state of the substrate. A, B, and C in the figure indicate cutting lines. A first embodiment of the present invention will be described with reference to the drawings.

The mother substrate 21 is a circular transparent substrate, and the mother substrate 22 is a circular silicon substrate.
A plurality of liquid crystal display elements 20 are formed in the two circular mother substrates 21 and 22. Reference numeral 24 denotes a seal body constituting the liquid crystal display element 20, and reference numeral 23 denotes a liquid crystal injection port. Reference numeral 25 denotes a seal body that hermetically seals the outer periphery of the two mother substrates 21 and 22, which are partially formed with gas vent holes (in this embodiment, two locations) and are bonded to the two mother substrates. Thereafter, it is sealed with a seal body 26. In this case, the vent hole is preferably provided at a position that does not reach the cutting line. The sealing body 24 may be applied to the entire periphery after the two mother substrates are bonded, and hermetically sealed.

  The liquid crystal display element 20 includes a transparent substrate 21A and a silicon substrate 22A, and is offset on the liquid crystal inlet 23 side as shown in FIG. In order to obtain such a liquid crystal display element 20, the circular mother substrate is cut along cutting lines A, B, and C as shown in FIG. The cutting line A cuts a portion where the sealing body 24 is formed across adjacent liquid crystal display elements.

Details of the cutting will be described with reference to FIGS. 2 is a diagram showing the position of the cutting line, FIG. 3 is a sectional view in the vicinity of each cutting line, (A) is a sectional view of the cutting line A part, and (B) is a cutting line B part in FIG. XX sectional drawing shown, (C) is a YY sectional view shown in FIG.
The cutting line A is a cutting by dicing, the transparent substrate 21A and the seal body 24 are all cut, and the silicon substrate 22A is cut to a breakable depth. At this time, cutting accuracy can be increased by cutting from the transparent substrate side. The cutting lines B are half-cut by dicing from the upper surface side of the transparent substrate 21A and from the lower surface side of the silicon substrate 22A, respectively, and break. If a break is possible, scribe may be used. The cutting line C is for half-cutting or scribing the transparent substrate 21A from the upper surface side. By removing the transparent substrate 21A between the cutting line B and the cutting line C of the transparent substrate 21A after breaking, the external connection terminals formed on the liquid crystal injection port 23 and the silicon substrate 22A come out on the surface. Liquid crystal is injected from the liquid crystal injection port 23 and the liquid crystal injection port 23 is sealed to complete the liquid crystal display element. The depth of dicing, which is a breakable depth (half cut), is that all of the transparent substrate (glass) is diced, and the silicon substrate is preferably 50% to 70%. Actually, since the silicon thickness is thinner or thicker than that defined by the dicing depth of the silicon substrate, the remaining amount of the silicon substrate is easily divided (easily broken) in the range of 100 μm to 400 μm. If the remaining amount of the silicon substrate is small, it is easy to break when handling the mother substrate. If the remaining amount is too large, it is difficult to break, and further, chipping damage on the outer periphery of the silicon substrate of the dicing part and variation in the cracking position are large.

  FIG. 4 is a top perspective view in which two mother substrates according to the present invention are bonded together, and is a view for explaining a second embodiment of the present invention. The difference from FIG. 1 is that the seal body 24 is of two types: a seal body 24 and a seal body 24A.

The seal body 24 required as a liquid crystal display element is a seal body with strong adhesion, and the seal body 24A is a seal body that is easily peeled off. An acrylic epoxy resin is preferable for the sealing body having a strong adhesive force. An acrylic resin is preferable for the sealing body that is easy to peel off. In the case of using the same resin, it is preferable to reduce the resin component concentration by mixing a medium into a sealing body having a strong adhering force for a sealing body that is easily peeled. The medium may be a urethane material or a resin and a sphere with a weak interfacial adhesion amount. Furthermore, even if the same resin is used, the effect condition of the resin can be changed. In the case of light, thermosetting, or combined use, it can be dealt with by changing the curing conditions with two types of sealing bodies. In the case of a photo-curing resin, a weak seal body can be provided with a filter to reduce the illuminance.
Basically, the gap between the cutting line B and the cutting line C is formed by a seal body 24A that is easy to peel off, so that the transparent substrate between the cutting line B and the cutting line C after break is easily peeled off. (D) of FIG. 3 is a ZZ sectional view of the section line C shown in FIG.

  When dicing, if the cooling is performed at a low temperature (preferably 0 ° C. or less), the seal body becomes hard and can be diced cleanly. Dicing while cooling in a gasified atmosphere of liquid nitrogen hardens the seal body, and since it is a nitrogen atmosphere, there is no condensation even when cooled, so there is no moisture adsorption inside the panel It is very effective without deteriorating the panel characteristics.

FIG. 1A is a top perspective view in which two mother substrates according to the present invention are bonded together, and FIG. 1B is a perspective view of a liquid crystal display element after cutting. Partial enlarged view of FIG. Sectional view showing the cut state of the substrate Top perspective view of two mother substrates according to the present invention bonded together A perspective view showing two material transparent substrates used in a conventional manufacturing method The perspective view which shows the state which piled up the said 2 material transparent substrate in the conventional manufacturing method, and was made into the one material board. The perspective view which shows the state which cut | disconnected the said raw material board into the raw material board piece in the conventional manufacturing method. The perspective view which shows the state which cut | disconnected the said raw material board piece into the liquid crystal display element in the conventional manufacturing method. The figure which shows the state which has filled the liquid crystal in the liquid crystal display element The perspective view which shows the two raw material transparent substrates used in the manufacturing method by a prior art The perspective view which shows the state which piled up the said 2 material transparent substrate in the manufacturing method by a prior art, and made it the one material board. The perspective view which shows the state which cut | disconnected the said raw material board into the raw material board piece in the manufacturing method by a prior art. The perspective view which shows the state which cut | disconnected the said raw material board piece into the liquid crystal display element in the manufacturing method by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display element 2 Material transparent substrate 3 Material transparent substrate 4 Sealing body 4A Inlet 5 Material plate 6 Cutting line 7 Material plate piece 8 Cutting line 9A Cutting line 9B Cutting line 11 Liquid crystal display element 12 One material transparent substrate 13 The other Material transparent substrate 14 Sealing body 14A Inlet 15 Material plate 16 Cutting line 17 Material plate piece 18 Cutting line 19A Cutting line 19B Cutting line 20 Liquid crystal display element 21 Mother substrate 21A Transparent substrate 22 Mother substrate 22A Silicon substrate 23 Liquid crystal inlet 24 Seal Body 24A Seal body 25 Seal body 26 Seal body

Claims (5)

at least,
In one of the aligned two mother substrates so that a plurality of liquid crystal display element region are adjacent to each other, the both sides of the switching disconnection of at least one side of the plurality of seal members so as to correspond to the respective liquid crystal display element region A sealing body forming step of forming a strip so as to straddle the liquid crystal display element and extending along the cutting line;
An attaching step of attaching the two mother substrates;
A cutting step of cutting the two mother substrates into a plurality of liquid crystal display elements along a cutting line between the adjacent liquid crystal display elements;
A method of manufacturing a liquid crystal display device comprising:
Said have you the cutting step, wherein in the cutting of the seal body portion across the adjacent liquid crystal display elements, can break the other mother board while cutting all the mother substrate and the sealing member of the hand of the two mother substrates Cut to an appropriate depth,
The liquid crystal in the cutting of non-seal body portion across the display element, a method of manufacturing a liquid crystal display element characterized said Turkey be cut by half-dicing or scribing with two mother substrates that said adjacent. 2. The pasting step further includes a step of pasting or sealing the outer periphery of the mother substrate leaving a vent hole, and the vent hole is formed at a position shifted from a cutting line. Liquid crystal display element manufacturing method. Wherein adjacent sealing body other than the cut line across the liquid crystal display device which has an offset portion between the two mother substrates, a seal member extending over the liquid crystal display device wherein adjacent of said offset portion, said adjacent liquid crystal 3. The method for producing a liquid crystal display element according to claim 1 , wherein the liquid crystal display element is a seal body that is more easily peeled off than a seal body other than the seal body straddling the display element . Wherein a two mother transparent substrate one of the substrate and the other is made of a silicon substrate, the cut of the seal body across the liquid crystal display elements adjacent in the cutting step, the cutting from the transparent substrate side method of manufacturing a liquid crystal display device according to any one of claims 1 to 3, characterized. 5. The cutting of the sealing body part straddling the adjacent liquid crystal display element is performed by dicing, and the dicing is performed in a state where the sealing body part straddling the adjacent liquid crystal display element is cooled. The manufacturing method of the liquid crystal display element as described in any one .

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