JP2008242150A - Method for manufacturing liquid crystal display panel and liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal display panel which prevents intrusion of a foreign substance from an inlet in injection of liquid crystal and high quality display is performed and the liquid crystal display panel manufactured by the method. <P>SOLUTION: The method for manufacturing the liquid crystal display panel of the present invention includes first and second substrates and is characterized by having the following processes of (1) to (5). (1) A process (S4') of forming a projection member for blocking intrusion of the foreign substance at a part where a liquid crystal inlet of the first substrate is formed, (2) a process (S5) of applying a seal member on outer surroundings except the part where the projection member is provided of the first substrate to form the liquid crystal inlet, (3) processes (S6-S8) of adhering the first substrate and the second substrate by interposing the seal member, (4) a process (S10) of injecting the liquid crystal from the liquid crystal inlet and (5) a process (S11) of sealing the liquid crystal inlet by encapsulant. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for manufacturing a liquid crystal display panel and a liquid crystal display panel, and more particularly, a method for manufacturing a liquid crystal display panel in which foreign matter does not enter from a liquid crystal injection port in a liquid crystal injection step, and a liquid crystal display manufactured by this manufacturing method. It is about the panel.

A liquid crystal display panel is usually bonded with a sealing material interposed between a pair of substrates, a space is formed between these substrates, and liquid crystal is injected into the space from a liquid crystal injection port provided in advance. It is manufactured by sealing a liquid crystal injection port after liquid crystal injection. However, in these series of manufacturing processes, foreign matter may enter from the liquid crystal injection port, particularly during the liquid crystal injection process. Therefore, various means for solving such problems have been studied, for example, Patent Document 1 below,
In 2 the method is shown.

FIG. 10 shows a manufacturing process of the liquid crystal display device disclosed in Patent Document 1 below. The liquid crystal cell constituting this liquid crystal display device is manufactured through the steps shown in the following (i) to (iv).

(I) Upper Electrode Substrate Formation Step In steps S21 to S24 in FIG. 10, the upper electrode substrate is made of a transparent substrate having a size capable of forming a plurality of liquid crystal cells, on which a predetermined electrode pattern and electrode are formed. A protective film and an alignment film are formed.

(I-1) Sealing material application process In step S25, a sealing material is applied to the outer periphery of the display area on the upper electrode substrate.
The sealing material is applied to each liquid crystal cell region, and at this time, the portion to be a liquid crystal sealing port is applied without being cut out. That is, in this step, the liquid crystal sealing port is closed.

(Ii) Lower Electrode Substrate Formation Step In step S26, a lower electrode substrate having the same size as the upper electrode substrate is prepared, and a predetermined electrode pattern, electrode protective film, and alignment film are formed on the substrate.

(Iii) Assembly division process In steps S27 to S29, the individual liquid crystal cells are cut after the upper and lower electrode substrates formed in the processes (i) and (ii) are bonded together. After the division, each liquid crystal cell is cleaned with a predetermined cleaning liquid.

(Iii-1) Encapsulation port forming step In step S30, the cleaned liquid crystal cell is cut at a part of the encapsulating portion in this step to form a liquid crystal encapsulation port.

(Iv) Liquid Crystal Encapsulation / Encapsulation Port Closure Step In steps S31 to S33, the liquid crystal cell in which the liquid crystal encapsulation port is formed is filled with liquid crystal using a liquid crystal injection device (not shown). Next, the liquid crystal sealing port is closed with a sealing agent, and then the liquid crystal cell is washed and completed.

Patent Document 2 below discloses a method for manufacturing a liquid crystal display element in which a band-like convex portion is formed on a substrate in a liquid crystal injection port and liquid crystal is filled from the injection port.
JP-A-5-165040 (FIG. 1, paragraphs [0012] to [0016]) JP-A-7-110489 (FIG. 1, paragraphs [0012] to [0016])

In the method of manufacturing the liquid crystal display panel of Patent Document 1, the liquid crystal cell is washed after the division in the assembly and division step of (iii) above, so that the cutting waste (
Dust) and ionic substances are removed. Further, in the above-mentioned (iii-1) sealing port forming step, since the cutting points are minimized, the number of attachment points of cutting waste and ionic substances is reduced. Further, in the liquid crystal sealing / sealing port closing step (iv), the adhesion of cutting waste and ionic substances has already been reduced, so that foreign matter such as dust during liquid crystal sealing can be reduced.

However, in the sealing port forming step of (iii-1), even if the number of cut points is small, it is essential to cut this point in order to inject liquid crystal, and this cut generates cutting dust and the like. There is a risk of entering the liquid crystal cell. Further, in an environment where liquid crystal is sealed, foreign matters such as metal pieces may float, and such foreign matters may enter the liquid crystal cell during liquid crystal injection. However, such intrusion of foreign matter is difficult to remove by the manufacturing method of Patent Document 1. Moreover, although the convex part functions as a prevention wall which prevents mixing of air and the sealing method of the said patent document 2 can improve the airtightness of sealing significantly, it does not have a foreign material removal capability.

If a foreign object such as a metal piece enters the inside of the liquid crystal cell, the substrates constituting the liquid crystal cell are electrically connected, so-called short-circuited, and this short-circuit causes a bright spot to appear on the display screen, degrading display quality. Invite. By the way, various inspection processes are executed until the liquid crystal cell is completed, and defective products are eliminated. However, depending on the size of the metal piece, it cannot be detected in the completed state of the liquid crystal cell, and the metal piece may move in the cell after the liquid crystal cell is incorporated into a device or during use, causing the above-mentioned defects. .

The present invention has been made to solve such problems of the prior art, and an object of the present invention is to prevent foreign matter from entering from the injection port at the time of liquid crystal injection, and to perform high-quality display. It is providing the manufacturing method of a liquid crystal display panel, and the liquid crystal display panel manufactured by this manufacturing method.

In order to achieve the above object, a method for manufacturing a liquid crystal display panel according to a first embodiment of the present invention is a method for manufacturing a liquid crystal display panel including first and second substrates, and includes the following (1) to (1) to (
5) It has the process.
(1) a step of forming a protruding member that prevents entry of a foreign substance at a position where the liquid crystal injection port of the first substrate is formed; (2) an outer periphery excluding the position where the protruding member of the first substrate is provided. Applying a sealing material to form the liquid crystal injection port, (3) bonding the first substrate and the second substrate with the sealing material interposed therebetween, and (4) liquid crystal from the liquid crystal injection port. (5) A step of sealing the liquid crystal injection port with a sealant.

According to the method for manufacturing a liquid crystal display panel according to the first embodiment of the present invention, since the protrusion is formed at the liquid crystal injection port, dust such as a metal piece enters from the liquid crystal injection port at the time of liquid crystal injection. Be blocked. As a result, it is possible to prevent foreign matters such as metal pieces from entering the liquid crystal display panel and causing an electrical short between the substrates and the appearance of bright spots on the display screen. Further, since this projecting member can be formed using a currently used member, it can be formed without increasing the number of steps, and the yield is improved.

In the first embodiment of the present invention, the protrusion member formed in the step (1) is a protrusion line having a predetermined height and width, or a protrusion line made up of a plurality of small protrusions. The protrusion rows are disposed in a direction orthogonal to the liquid crystal inflow direction in the introduction path communicating with the liquid crystal injection port, and their height is the height of the cell gap between the first and second substrates. 40-8
It is characterized by being formed at a height of 0% .

According to the first embodiment, since the protrusion rows composed of the hook-shaped protrusion rows and the small protrusions are simple in structure, they can be easily created. In addition, by making the height of each projection row 40 to 80% of the cell gap between the first and second substrates, the liquid crystal injection is not hindered.
Intrusion of foreign objects can be prevented.

Further, in the first embodiment of the present invention, the projection row composed of the plurality of small projections includes a first projection row in which a plurality of small projections are arranged with a predetermined gap, and the first projection row. A plurality of small projections having the same size as the small projections of the projection row, the second projection row being arranged in a plurality of rows parallel to the first projection row with the same gap as the predetermined gap. The first and second protrusion rows are alternately arranged with a predetermined interval so that the small protrusions of the second protrusion row are positioned between the adjacent small protrusions of the first protrusion row. To do.

In the first embodiment of the present invention, the small protrusions of the second protrusion row are connected to the small protrusions of the adjacent first protrusion row on the liquid crystal inlet side.

According to the first embodiment, since a plurality of rows of projections made up of small projections are arranged at the liquid crystal inlet serving as the liquid crystal inflow passage, the liquid crystal inflow route becomes longer, and dust such as metal pieces is deposited on the liquid crystal. Even if it is mixed, intrusion of dust and the like is prevented in the middle of this long inflow path. Further, since the blocked dust is trapped between the small protrusions and the protrusion rows, the dust does not move into the internal space during the operation of the liquid crystal display panel. As a result, it is possible to prevent foreign matters such as metal pieces from entering the liquid crystal display panel and causing an electrical short between the substrates.

Further, in the first embodiment of the present invention, the protruding member is formed of the same material as a photo spacer used when maintaining the first and second substrates at a predetermined interval. .

According to the first embodiment, by forming the protruding member with the same material as that of the photo spacer, the protruding member can be easily formed without using a special material and without increasing the number of manufacturing steps.

Moreover, the manufacturing method of the liquid crystal display panel concerning the 2nd Embodiment of this invention is a manufacturing method of a liquid crystal display panel provided with the 1st and 2nd board | substrate, Comprising: The following processes (1)-(6) are carried out. It is characterized by having.
(1) a step of forming a protruding member that prevents foreign substances from entering the portion of the first substrate where the liquid crystal injection hole is formed; (2) the second substrate is located immediately below the protruding member of the first substrate. A step of forming a recess having a predetermined depth at a location, and (3) a step of forming a liquid crystal injection port by applying a sealing material to the outer periphery excluding the location where the projection member of the first substrate is provided. (4) the first
A step of bonding the substrate and the second substrate with the sealant interposed therebetween, (5) a step of injecting liquid crystal into the space from the liquid crystal injection port, and (6) sealing the injection port with a sealing agent. Process.

According to the second embodiment, since the projecting member and the recess are provided in the liquid crystal injection port, dust such as metal pieces can be prevented from entering from the liquid crystal injection port during liquid crystal injection. In particular, dust that is prevented from entering the liquid crystal display panel by the protruding member is captured in the recess. As a result, it is possible to prevent foreign matters such as metal pieces from entering the liquid crystal display panel and causing an electrical short between the substrates, and bright spots appearing on the display screen. Further, since the projecting member and the recessed portion have a simple structure, they can be formed at a low cost.

Further, in the second embodiment of the present invention, the protrusion member formed in the step (1) is a hook-shaped protrusion line having a predetermined height and width, or a protrusion line comprising a plurality of small protrusions. The protrusion rows are disposed in a direction orthogonal to the liquid crystal inflow direction in the introduction path communicating with the liquid crystal injection port, and their height is the height of the cell gap between the first and second substrates. 40-8
It is formed at a height of 0% , and the dent is formed as a concave groove with respect to the ridge-shaped projection row,
The protrusion row formed of the small protrusions is formed with a recessed hole corresponding to each small protrusion.

According to the second embodiment, the projection row is formed by a projection row consisting of a bowl-like projection row and a small projection, and the recess is shaped to match the shape of the bowl-like projection row and the small projection. Therefore, it is possible to efficiently prevent intrusion of dust and the like, and to capture dust and the like in the recess.

Further, in the second embodiment of the present invention, the projection row composed of the plurality of small projections includes a first projection row in which a plurality of small projections are arranged with a predetermined gap, and the first projection row. A plurality of small projections having the same size as the small projections of the projection row, the second projection row being arranged in a plurality of rows parallel to the first projection row with the same gap as the predetermined gap. The first and second protrusion rows are alternately arranged with a predetermined interval so that the small protrusions of the second protrusion row are positioned between the adjacent small protrusions of the first protrusion row. To do.

In the second embodiment of the present invention, the small protrusions of the second protrusion row are connected to the small protrusions of the adjacent first protrusion row on the liquid crystal inlet side.

According to the second embodiment, since a plurality of protrusion rows and recesses made of small protrusions are arranged at the liquid crystal inlet serving as the liquid crystal inflow path, the liquid crystal inflow path becomes long, and the liquid crystal has a metal piece or the like. Intrusion of dust and the like is prevented in the middle of the long inflow path even if dust is mixed. Also,
Since the blocked dust is captured in the recess, the dust does not move and enter the internal space during the operation of the liquid crystal display panel. As a result, it is possible to prevent foreign matters such as metal pieces from entering the liquid crystal display panel and causing an electrical short between the substrates.

Also, in the second embodiment of the present invention, the protruding member is formed of the same material as a photospacer used when maintaining the first and second substrates at a predetermined interval, It is characterized in that it is formed on an alignment film extending just below the protruding member.

According to the second embodiment, the projecting member and the recess can be formed by using the material used in the manufacturing process of the liquid crystal display panel as it is, so that the manufacturing process is increased without using a special material. It can be formed easily without any problems.

Moreover, the liquid crystal display panel concerning this invention was manufactured by the manufacturing method of the liquid crystal display panel in any one of the said Claims 1-10.

According to the above aspect, a liquid crystal display panel having the above-described effects can be obtained, so that a high quality liquid crystal display panel can be provided.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display panel manufacturing method and a liquid crystal display panel for embodying the technical idea of the present invention. It is not intended to be specific to a display panel, and other embodiments within the scope of the claims are equally applicable. The term “liquid crystal display panel” used in the following description.
Is the same as that of the “liquid crystal cell” used in Patent Document 1.

FIG. 1 is a flowchart schematically showing a manufacturing process of a liquid crystal display panel according to Embodiment 1 of the present invention. First, the outline of the manufacturing process of the liquid crystal display panel according to Embodiment 1 of the present invention will be described with reference to the process chart.

The liquid crystal display panel according to Example 1 is a first substrate having a predetermined size in which various wirings and thin film transistors (TFTs; hereinafter referred to as “TFTs”) are disposed on the surface in Step S1. Mother substrate (hereinafter referred to as “TFT substrate”). The TFT substrate is prepared as a substrate having a size capable of forming a plurality of liquid crystal display panels, for example, a substrate made of glass. In step S2, the TFT
An alignment film is formed on the substrate surface.

Subsequently, in step S3, a mother substrate (hereinafter referred to as “CF substrate”) as a second substrate having a color filter (CF), a common electrode, and the like formed on the surface is created. This C
The F substrate is prepared as a transparent substrate having substantially the same size as the TFT substrate, for example, a substrate made of glass. Next, a photo spacer is disposed on the surface of the CF substrate in step S4. At this time, similarly, in step S4 ′, a projection member having a predetermined height is formed which allows liquid crystal to flow into the portion where the liquid crystal injection port is formed while preventing entry of foreign matter. This projecting member constitutes the main configuration of the present invention, and the structure thereof will be described later.

Thereafter, in step S5, the individual liquid crystal display panel regions of the CF substrate are partitioned, and a sealing material is applied to each partition using, for example, a dispenser. In this sealing material application process, a liquid crystal injection port is formed. The liquid crystal injection hole is formed by extending a seal material to the outer edge of the liquid crystal display panel region along both side ends of a portion corresponding to the liquid crystal injection hole.

After the production of the TFT substrate and the CF substrate, these substrates are aligned and positioned, that is, aligned and bonded together in step S6. Next, in step S7, press working is performed in order to obtain a gap dimension between the two substrates. Furthermore, baking is performed in step S8. Thereafter, the TFT substrate and the CF substrate attached to each other in step S9 are divided into sections, and individual liquid crystal display panels are created. Finally, in steps S10 and S11, liquid crystal is injected from the liquid crystal injection port into the internal space surrounded by both substrates and the sealing material of each liquid crystal display panel, and then this liquid crystal injection port is sealed with a sealing agent. . By going through these steps,
Individual flat liquid crystal display panels are manufactured.

FIG. 2 is a view showing each substrate used in manufacturing the liquid crystal display panel of the present invention.
Is a plan view of the TFT substrate, and FIG. 2B is a plan view of the CF substrate. Figure 3 is a view for explaining a liquid crystal injection port portion, FIG. 3A is an enlarged plan view of a portion X in FIG. 2B, X ₁ in FIG. 3B Figure 3A
FIG. 3C is a longitudinal sectional view of FIG. 3A. 4A is a perspective view before the TFT substrate and the CF substrate are bonded together, and FIG. 4B is a perspective view of the state after the TFT substrate and the CF substrate are bonded together. Below, with reference to FIGS. 2-4, each process in the manufacturing process of the liquid crystal display panel mentioned above is explained in full detail.

(A) TFT substrate production process (steps S1 and S2 in FIG. 1)
The surface of the TFT substrate 1 is divided into individual liquid crystal display panel portions 1 ₁ to 1 ₁₀ , and various wirings such as signal lines and scanning lines and TFTs are used for each of the divided areas using a known semiconductor manufacturing apparatus. And pixel electrodes are formed. Next, an alignment film made of, for example, polyimide or the like is formed thereon, and this alignment film is subjected to a rubbing process. Also,
The TFT substrate 1, alignment marks 2 _A is formed in two corners facing each other. Note that spacers are preferably dispersed on the TFT substrate 1. By providing such a spacer, the gap between the panels of both substrates can be made uniform in the pressing step (step S7 in FIG. 1) for bonding the TFT substrate and the CF substrate.

(B) CF substrate production process (steps S3 to S5)
The surface of the CF substrate 5 is divided into individual liquid crystal display panel portions 5 _{1 to} 5 ₁₀ , and a black matrix, a color filter, a common electrode, and the like are formed in each of the divided areas. An alignment film made of, for example, polyimide is formed on these layers, and the alignment film is subjected to a rubbing process. In addition, columnar photo spacers 7 are formed inside a plurality of regions of the CF substrate 5. The photospacer 7 is made of a thermosetting resin material such as acrylic resin. In addition, alignment marks 6 are provided at opposite corners of the CF substrate 5. Thereafter, the sealing material 8 is applied to the CF substrate 5 along the outer periphery of each of the compartments 5 _{1 to} 5 ₁₀ using the dispenser D.

(B-1) Formation of Liquid Crystal Injection Port The structure of the liquid crystal injection port 9 will be described with reference to FIG. The liquid crystal injection port 9 has an opening 9 _A having a predetermined aperture width L, and the opening 9 _A across the side wall 8 to a pair of opposed, which extends a predetermined length into the inner space direction _{A to,} 8 _B Between the opposing side walls 8 _A and 8 _B, an introduction path 9 _{B through} which liquid crystal is injected
It has become. These side walls 8 _A and 8 _B are formed of a sealing material 8 applied on the CF substrate. That is, one end portion ₈₁ of the opening 9 _A becomes a starting point of time of applying the sealing material 8, the other end portion ₈₂ has a end point. The introduction path 9 _B, the protrusion member PL1 having a height such may be injected liquid intrusion of foreign matters such as metal pieces and blocks are formed. The projection member PL1 is ridged projection rows having a predetermined height h and width dimension W ₂ is a plurality of, for example, six ridged projections column P _L1 to P _L6 is at a predetermined distance W ₃ It is formed of an array. The height h of the protruding member is 50% to 80% of the cell gap.
When a specific example of this bowl-shaped projection row is given, the width L of the opening is 3.00 mm, and the projection height h is 2.
μm (the cell gap is 4 μm at this time), and the width W ₂ of the projection row is 60 to 150
[mu] m, a gap _{W 3} between the ridged projection rows is 60 to 150. In addition, the width W shown in FIG. 3B
₁ is 120-300 micrometers.

These protruding members PL1, when forming the photo spacers 7 on the CF substrate 5, the common electrode 4 is extended to the introduction path 9 _B, using the same material as the photo spacers 7 on the common electrode 4 It is preferable to form in the same process (step S4 ′ in FIG. 1). Thereby, a protrusion member can be easily formed without adding a special material and process.

(C) Substrate bonding and dividing step (steps S6 to S9)
With reference to FIG. 4, the substrate bonding and dividing step will be described. In the steps (a) and (b), the TFT substrate 1 coated with the sealing material and the CF substrate 5 on which the liquid crystal injection port 9 is formed face each other and overlap each other. Both the positioning is carried out by combining the alignment marks 2 _A formed on the alignment mark 6 and the TFT substrate 1 side which is formed on the CF substrate 5 sides. At that time, a temporary adhesive, for example, an ultraviolet curable temporary adhesive S is applied to the periphery of the TFT substrate 1 in advance, and after the positioning of both is completed, the temporary adhesive is cured by irradiating ultraviolet rays. It is preferable to do so. A predetermined pressure P is applied to the temporarily fixed TFT substrate 1 and CF substrate 5 by a press (not shown) to form a predetermined substrate gap, that is, a cell gap. This cell gap is determined by the electro-optical characteristics of the liquid crystal material and is set in a range of about 1 to 10 μm. After this cell gap is formed, it is put into a baking machine (oven) and baked. Thereby, the sealing material 8 is cured, and the CF substrate 5 and the TF
T substrates 1 are bonded to each other. Thereafter, the TFT substrate 1 and the CF substrate 5 adhered to each other are divided into sections, and individual liquid crystal display panels are produced.

(D) Liquid crystal injection and sealing step (Steps S10 and S11)
Next, liquid crystal is injected from a liquid crystal injection port 9 formed in each liquid crystal display panel. This liquid crystal injection is performed using a known liquid crystal injection device. At this time, the liquid crystal injection port 9 has a structure shown in FIG.
As shown in FIG. 3A and FIG. 3C, a plurality of protrusion rows PL _{1 to} PL ₆ are provided in the liquid crystal introduction path 9 _B , but the liquid crystal is between the TFT substrate 1 and each of the protrusion rows PL _{1 to} PL _6. Injected through.
At this time, if dust such as metal pieces is mixed in the liquid crystal, these dusts are projected rows PL _{1 to} PL _6.
Is prevented from entering the internal space. On the other hand, each of the protrusion rows PL _{1 to} PL ₆ has a height of 2 μm and is 50% of the cell gap of 4 μm.
The gap flows between the T substrate 1 and the projection rows PL _{1 to} PL ₆ without any trouble. It should be noted that the dust such as a metal piece that has been prevented from entering is fixed in place by the sealant while being captured between the plurality of protrusion rows PL _{1 to} PL ₆ , and the liquid crystal display panel 1 is attached to the device. Even after being mounted, the liquid crystal display panel 1 does not move during operation and does not enter the liquid crystal display panel 1, and good display quality can be maintained.

Hereinafter, with reference to FIGS. 5-7, the modification of this protrusion member is demonstrated.
The following modified examples 1 to 3 are constituted by a projection row in which a plurality of small projections having a predetermined height are arranged in place of the bowl-like projection rows PL _{1 to} PL ₆ of the _first embodiment.

(Modification 1)
Figure 5A is an enlarged plan view of a liquid crystal inlet section according to Modification 1 of Embodiment 1, FIG. 5B is an enlarged plan view of the X ₃ portion of Figure 5A, Figure 5C is a longitudinal sectional view of FIG. 5A. This FIG. 5 shows FIG. 3A of the first embodiment.
FIGS. 3B and 3C correspond to FIGS.

First, the protrusion member PL2 of Modification 1 will be described with reference to FIG. Projection member PL of Modification 1
2, introduction channel ₉ two first to _B, and those second projection rows _PL A, is PL _B are arranged at predetermined intervals. The first projection rows PL _A, the projection rows of small projections P ₁ having a predetermined height are arrayed in a line at a plurality predetermined gap is a plurality of rows, for example, six rows of projection rows P _A1 to P _A6
Consists, each projection rows _P A1 _{to P A6} is formed at a predetermined distance _{W 5.} Small projections P ₁ is formed of a columnar body of a square having a length W ₂ of a given height h and one side. The height h of the small projections P ₁ is formed of 50% to 80% of the height of the cell gap.

The second protrusion row PL _B is composed of a protrusion row in which a plurality of small protrusions P ₂ having the same height as the small protrusions P ₁ are arranged with a predetermined gap, and a plurality of rows, for example, six protrusions. Rows P _{B1 to} P _B
Consists _6, each of the projection rows _P B1 _{to P B6} are formed at predetermined intervals _{W 5.} The first and second protrusion rows PL _A and PL _B are respectively connected to the protrusion rows P _{A1 to} P _A6 and P _B1 to P _B1 .
P _B6 are arranged so as to be alternately arranged. That is, each of the small protrusions _{P 2} of the second projection rows PL _B are arranged so as to be positioned between the small projections _P 1, _{P 1} of the first projection rows PL _A. By arranging this way, a gap _{W 6} is formed between the first and second projection rows _PL A, the small projection _{P 1} of the PL _B and small projection _{P 2.}

Specific examples of the projection rows, the width length _{W 2} of one side of the pillar-shaped small projection _{P 1} is 60 to 150
μm and height h are 2 μm (the cell gap is 4 μm at this time), the spacing W ₃ between the small projections is 20 to 100 μm, the width W ₅ of the projection row is 100 to 350 μm, and W ₆ is 20 to 20 μm. 1
A 00Myuemu, small projections _{P 2} have the same size as the small projection _{P 1.} The width W ₄ is 8
0 to 250 μm.

These protruding members PL2, when forming the photo spacers 7 on the CF substrate 5, such as the common electrode 4 is extended to the introduction path 9 _B, using the same material as the photo spacers 7 on the common electrode 4 It is preferable to form them in the same process. Thereby, a protrusion member can be easily formed without adding a special material and process.

According to this arrangement, when the liquid crystal injection, the injected liquid crystal L _C is partially first projection rows PL _A
Of it collides with the small protrusion P ₁ collides with the small protrusion P ₂ of the second projection rows PL _B of the back row through the gap between the TFT substrate 1 and is injected into the interior space thereafter through a similar path. Also, other liquid _{L C} is first
Passes between small projections P ₁ adjacent the protruding rib PL _A, collide with the small protrusion P ₂ of the second projection rows P _B, is injected into the interior space via a path indicated by arrows in FIG. 5B is branched The As described above, since the plurality of rows of protrusions are arranged in the introduction path, the flow path for liquid crystal injection becomes longer, and even if dust such as metal pieces is mixed in the liquid crystal, the flow path of the longer flow path Intrusion is blocked and there is no intrusion into the space.

(Modification 2)
FIG. 6 shows a protrusion member PL3 of the second modification. Figure 6A is an enlarged plan view of a liquid crystal inlet section according to Modification 2 of Embodiment 1, FIG. 6B is an enlarged plan view of the X ₄ moiety in Figure 6A, Figure 6C Figure 6A
FIG.

The projection member PL3, the second projection rows PL respective small projections _{P 2} is the first projection rows PL of _B variant 1
The small projection P _{1 of A} is in contact with the liquid crystal injection port 9 on the side close thereto. Other configurations are the same as those of the first modification. Gap _{W 7} has become a 20~100μm.

According to this arrangement, as in the first modification, the liquid crystal inflow channel becomes long, and even if dust such as metal pieces is mixed in the liquid crystal, the liquid crystal is blocked in the middle of the long channel. No intrusion into.

(Modification 3)
FIG. 7 shows a protrusion member PL4 of the third modification. Note that FIG 7A is an enlarged plan view of a liquid crystal inlet section according to Modification 3 of Embodiment 1, FIG. 7B is an enlarged plan view of the X ₅ parts of FIG. 7A, FIG. 7C is a longitudinal sectional view of the X ₃ portion of Figure 4B It is.

The projection member PL4, among the first and second modifications of the projecting member, but leaving only the first projection rows PL _A without creating a second projection rows PL _B. It has been experimentally confirmed that the protrusion member PL4 can also prevent the intrusion of dust such as metal pieces.

FIG. 8 is a manufacturing process diagram of a liquid crystal display panel according to Embodiment 2 of the present invention, and FIG. 9 is a cross-sectional view of a liquid crystal injection port created in the process of FIG. 9A to 9D are the liquid crystal injection holes shown in FIG.
C, sectional views corresponding to FIGS. 5C, 6C, and 7C. A method for manufacturing a liquid crystal display panel according to Example 2 of the present invention will be described below with reference to FIGS.

In this method of manufacturing a liquid crystal display panel, a step of forming recesses corresponding to the shapes of the protruding members PL1 to PL4 of Example 1 is added to the TFT substrate creation step. Therefore, this manufacturing method is the same as the first embodiment except that the step of forming the recess in the TFT substrate is different from the step of the first embodiment. Therefore, common steps and structures are denoted by the same reference numerals and redundant description is omitted, and different steps and structures will be described.

In step S2 ′, the TFT substrate 1 has a recess having a predetermined shape so as to face each protrusion row at a position corresponding to the protrusion member formed on the CF substrate 5 (this protrusion member is formed in step S4 ′). D1 to D4 are formed. Since these dent portions D1 to D4 are formed in different shapes depending on the respective projection members PL1 to PL4, the dent portions for the respective projection members PL1 to PL4 will be described below.

(2-a) Liquid Crystal Injection Port Having Recessed Part D1 Corresponding to Protrusion Member PL1 With reference to FIGS. 8 and 9A, creation of a liquid crystal injection port having a recessed part D1 corresponding to the protrusion member PL1 will be described. As shown in step S2 ′ of FIG. 8, when the TFT substrate 1 forms an alignment film, the alignment film is extended to the liquid crystal injection port, and a recess D1 is formed in the alignment film 3. The recessed portion D1 is formed in a concave groove ₃ L1 _{to 3 L6} having a predetermined depth and width lengths beneath the ridge-like projection column _PL 1 _{~PL 6.} As a specific example of this concave groove, the depth is 0 to 2.0.
It is preferable that the μm and the width length be the same as the width length of the bowl-shaped protrusion rows PL _{1 to} PL ₆ .

On the other hand, in the step S4 ′, the CF substrate 5 is formed with the same bowl-shaped projection rows PL _{1 to} PL ₆ as the projection member of the first embodiment. Then, a liquid crystal display panel is produced through steps S6 to S11. Each step is the same as the step in the first embodiment.

As described above, when the liquid crystal inlet 9 is provided with the concave portion D1 including the bowl-shaped projection rows PL _{1 to} PL ₆ and the concave grooves 3 _{L1 to} 3 _L6 , dust such as metal pieces is mixed in the liquid crystal. The dust is blocked by the bowl-shaped projection rows PL _{1 to} PL ₆ , or the concave grooves 3 _{L1 to} 3 _{L6 in the} recesses.
Captured within.

(2-b) Liquid crystal inlet having a recess portion D2 corresponding to the protrusion member PL2 The recess portion D2 is located directly below the small protrusions P ₁ and P ₂ of the protrusion rows PL _A and PL _B , as shown in FIG. 9B. The recess holes 3 _{LA1 to} 3 _LA6 and 3 _{LB1 to} 3 _LB6 having a predetermined size are formed. As a specific example of the concave groove, the depth is preferably 0 to 2.0 μm, and the width is preferably the same as that of the small protrusion. On the other hand, in step S4 ′, the protruding member PL2 similar to that in the first embodiment is formed.

(2-c) Liquid crystal inlet having a recess portion D3 corresponding to the protrusion member PL3 The recess portion D3 is formed in a pair of small protrusions of the first and second protrusion rows PL _A and PL _B as shown in FIG. 9C. became small projections, for example, those holes 3L ₁ 1 single recess directly below the small protrusions _P A1, _{P B1 'was} formed.

(2-d) Liquid crystal inlet having a recess portion D4 corresponding to the protrusion member PL4 The recess portion D4 is a recess hole of a predetermined size directly below each small protrusion P _{A1 to} P _A6 of the protrusion row, as shown in FIG. 9D. 3 _{L1 ′ to} 3 _{L6 ′} are formed.

By forming the recesses D1 to D4 as shown in the above (2-a) to (2-d), dust such as metal pieces can be captured more efficiently.

3 is a flowchart illustrating a manufacturing process of the liquid crystal display panel according to the first embodiment. It is the figure which showed each board | substrate used when manufacturing the liquid crystal display panel of this invention. It is a figure for demonstrating a liquid-crystal injection hole part. It is a perspective view before and after bonding of a TFT substrate and a CF substrate. FIG. 5 is a view showing a protruding member of the first modification. FIG. 6 is a view showing a protruding member of Modification 2. FIG. 7 is a view showing a protruding member of Modification 3. FIG. 8 is a manufacturing process diagram of a method for manufacturing a liquid crystal display panel according to Embodiment 2 of the present invention. FIG. 9 is a cross-sectional view of the liquid crystal injection port formed in the manufacturing process of FIG. FIG. 10 is a manufacturing process diagram of a conventional liquid crystal display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... TFT mother substrate 2 _A ... Alignment mark 3 ... Alignment film 5 ... CF mother substrate 6 ... Alignment mark 8 ... Sealing material 9 ... Liquid crystal injection port 9A ... Opening 9B ... Liquid crystal introduction path D1-D4 ... Depression part P _L1 ~ P _L6 , P _LA , P _LB ... projection row

Claims (11)

A method for manufacturing a liquid crystal display panel including first and second substrates, the following (1) to (5)
A process for producing a liquid crystal display panel comprising the steps of:
(1) A step of forming a protruding member that prevents entry of foreign matter at a location where the liquid crystal injection port of the first substrate is formed,
(2) forming a liquid crystal injection port by applying a sealing material to an outer periphery excluding a portion where the protruding member is provided on the first substrate;
(3) A step of bonding the first substrate and the second substrate with the sealant interposed therebetween,
(4) Injecting liquid crystal from the liquid crystal injection port,
(5) A step of sealing the liquid crystal injection port with a sealant. The projecting member formed in the step (1) includes a hook-shaped projecting row having a predetermined height and a width, or a projecting row composed of a plurality of small projections, and the projecting row includes the liquid crystal injection port. Arranged in a direction orthogonal to the liquid crystal inflow direction, and their height is
2. The method of manufacturing a liquid crystal display panel according to claim 1, wherein the liquid crystal display panel is formed at a height of 40 to 80% of the cell gap between the first and second substrates. The plurality of small protrusions includes a first protrusion line in which a plurality of small protrusions are arranged with a predetermined gap, and a plurality of protrusions having the same size as the small protrusions in the first protrusion line. A plurality of second protrusion rows arranged in parallel to the first protrusion row with the same gap as the predetermined gap,
The first and second protrusion rows are alternately arranged at predetermined intervals so that the small protrusions of the second protrusion row are positioned between adjacent small protrusions of the first protrusion row. The manufacturing method of the liquid crystal display panel of Claim 2. 4. The method of manufacturing a liquid crystal display panel according to claim 3, wherein the small protrusions of the second protrusion row are connected to the adjacent small protrusions of the first protrusion row on the liquid crystal inlet side. 2. The method of manufacturing a liquid crystal display panel according to claim 1, wherein the protruding member is formed of the same material as a photospacer used when the first and second substrates are maintained at a predetermined interval. . A method for manufacturing a liquid crystal display panel including first and second substrates, the following (1) to (6)
A process for producing a liquid crystal display panel comprising the steps of:
(1) A step of forming a protruding member that prevents entry of foreign matter at a location where the liquid crystal injection port of the first substrate is formed,
(2) forming a recess having a predetermined depth at a position of the second substrate located directly below the protruding member of the first substrate;
(3) forming a liquid crystal injection port by applying a sealing material to an outer periphery excluding a portion where the protruding member is provided on the first substrate;
(4) The process of bonding the said 1st board | substrate and the said 2nd board | substrate through the said sealing material,
(5) Injecting liquid crystal into the space from the liquid crystal injection port,
(6) A step of sealing the inlet with a sealant. The projecting member formed in the step (1) includes a hook-shaped projecting row having a predetermined height and a width, or a projecting row composed of a plurality of small projections, and the projecting row includes the liquid crystal injection port. Arranged in a direction orthogonal to the liquid crystal inflow direction, and their height is
The first and second inter-substrate cell gaps are formed at a height of 40 to 80% , and the concave portions are formed as concave grooves with respect to the bowl-shaped protrusion rows, and the protrusion rows are formed of the small protrusions. 7. The method of manufacturing a liquid crystal display panel according to claim 6, wherein the liquid crystal display panel is formed with a recessed hole corresponding to each small protrusion. The plurality of small protrusions includes a first protrusion line in which a plurality of small protrusions are arranged with a predetermined gap, and a plurality of protrusions having the same size as the small protrusions in the first protrusion line. A plurality of second protrusion rows arranged in parallel to the first protrusion row with the same gap as the predetermined gap,
The first and second protrusion rows are alternately arranged at predetermined intervals so that the small protrusions of the second protrusion row are positioned between adjacent small protrusions of the first protrusion row. The manufacturing method of the liquid crystal display panel of Claim 7. 9. The method of manufacturing a liquid crystal display panel according to claim 8, wherein the small protrusions of the second protrusion row are connected to the adjacent small protrusions of the first protrusion row on the liquid crystal inlet side. The projecting member is formed of the same material as a photo spacer used to maintain the first and second substrates at a predetermined interval, and the recess is on an alignment film that extends to a position directly below the projecting member. The liquid crystal display panel manufacturing method according to claim 6, wherein the liquid crystal display panel is formed. A liquid crystal display panel manufactured by the method for manufacturing a liquid crystal display panel according to claim 1.

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