JPH0822015A - Liquid crystal display panel and its production - Google Patents

Abstract

PURPOSE:To provide a liquid crystal display panel which is formed by sticking both substrates by an anisotropically conductive sealant contg. conductive particles and prevents shorting between the electrodes of both substrates by outflow of the conductive particles to the display region side on the inner side from its sealing part. CONSTITUTION:This liquid crystal display panel is constituted by sticking a pair of substrates 11, 14 respectively formed with the electrodes 12, 15 in at least a display region A and electrode terminal 15a parts in a non-display region connected to these electrodes 12, 15 by the sealant 17 contg. the conductive particles 16 in the sealing part 10 around the display region A by holding the specified spacing in such a manner that the electrodes 11, 15 face each other and electrically connecting the electrode terminal 15a part of another substrate 14 to the connecting terminal 13 part of the one substrate 11. The sealing part 10 is provided with the conductive particle barrier 1 for preventing the outflow of the conductive particles 16 to the display region side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and its manufacturing method. More specifically, the conductive particles are mixed with the sealant to attach a pair of upper and lower substrates, and the electrode terminals of the other substrate are electrically connected to the connection terminals of one substrate, and the electrode terminal portion is The present invention relates to a liquid crystal display panel having a structure integrated on a substrate and a manufacturing method thereof.

[0002]

2. Description of the Related Art In a liquid crystal display panel, two substrates each having at least an electrode provided in a display region and an electrode terminal portion provided in a non-display region connected to the electrode are fixed so that the electrodes face each other. It is formed by affixing with a sealant around the display area while holding the gap. In this liquid crystal display panel, in order to simplify the connection between each electrode terminal and the external drive circuit, the connection terminal provided at the end of one substrate is connected to the electrode terminal of the other substrate, and the electrode terminal A method in which all the groups are aggregated on one substrate is generally used.

As a method of collecting all of these electrode terminals on one substrate, a silver paste or a carbon paste or the like is applied to the electrode terminals of the other substrate when the two substrates are adhered by a sealant. Printing, applying a sealant to one substrate and adhering it, and connecting the connection terminal part of one substrate to the electrode terminal part of the other substrate via a conductive material of silver dot printing, A method is used in which two substrates are adhered by a sealing agent mixed with conductive particles and, at the same time, conductive particles are sandwiched between the terminal portions of both substrates to connect the upper and lower connection terminal portions and the electrode terminal portions. .

Here, the conductive particles are, for example, nickel particles, solder particles, or plastic balls having a diameter of several μm plated with gold (for example, Micropearl Au210, trade name, manufactured by Sekisui Fine Chemical Co., Ltd.).
Particles of which the surface is at least 16 μm and at least the surface of which is electrically conductive.

The method using conductive particles is characterized in that the liquid crystal material is not disturbed in orientation or chemically changed, and the gap between both substrates is not changed, so that the display appearance is not impaired. It is advantageously used as disclosed in Japanese Patent Publication No. 53-43306. In this method, the sealant is applied by pressing and heating, so the conductive particles sandwiched between the terminals of the upper and lower substrates by pressure contact are crushed and pinched, and electrical connection is made between the terminals of the upper and lower substrates. However, since no pressure is applied in the lateral direction, no electrical contact is made and no short circuit occurs between adjacent terminals. A mixture of such a sealant and conductive particles is generally called an anisotropic conductive sealant.

Referring to the drawing described in Japanese Patent Publication No. 53-43306, FIG. 7 is a cross-sectional explanatory view of the structure of a liquid crystal display panel using a conventional anisotropic conductive sealant.

In FIG. 7, one substrate 11 is provided with a counter electrode 14 for connection with the pixel electrode 12 and an external drive circuit.
The connection terminal 13 connected to the electrode terminal 15a is formed, and the pixel electrode 15 and the electrode terminal 15a thereof are formed on the other counter substrate 14. Both boards are
The conductive particles 16 are bonded to each other by the sealant 17 in which the conductive particles 16 are mixed, and the electrode terminals 15 a of the substrate 14 are connected to the connection terminals 1 of the substrate 11 via the conductive particles 16 as described above.
It is connected with 3. The thickness of the liquid crystal layer 19 (distance between opposing electrodes, cell gap) is mainly defined by the spacer 18.

Here, in order to improve the reliability of conduction between the connection terminal 13 and the electrode terminal 15a of both substrates 11 and 14,
It is necessary to secure as large a contact area as possible between the conductive particles 16 and the electrode terminals 15a and the connection terminals 13 for connection with the external drive circuit. Therefore, the diameter of the conductive particles 16 used is somewhat larger than the diameter of the spacer 18 or the required cell gap, and a relatively soft material is used so as not to exceed the specified panel gap.

In FIG. 7B, both substrates 11 and 1 shown in FIG.
The partial expanded sectional view of the connection part between the terminals 13 and 15a of FIG. d is both substrates 11 and 14 in the display area A of the panel
It shows the gap between them. 16b indicates conductive particles having a particle size b larger than the panel gap d, and 16a indicates conductive particles having a particle size a smaller than the panel gap d. If conductive particles 16 having a particle size a smaller than the panel gap d or a particle size equal to the panel gap d are mixed in the sealant, there is a high possibility that conduction failure will occur between the terminals 13 and 15a of both substrates. Conductive particles 16 mixed in the sealant 17 in order to obtain more reliable electrical conduction.
Has a particle size larger than the panel gap d.

[0010]

In the case of a simple matrix liquid crystal display panel, since the electrode terminals of both substrates are patterned in pixel column units, the electrode terminals of the other substrate are not electrically connected between adjacent electrodes. In this way, the connection terminals of one of the substrates must be independently conducted. Ideally, the conductive particles 16 in the anisotropic conductive sealant 17 are the sealant 1
It is necessary to prevent it from existing between the electrodes 12 and 15 of both substrates on the inner side of the sealant 17 on the display area A side from the sealant 17, but in reality, the conductive particles are inside the sealant. It may flow out to the display area A side. In the display area A inside the seal portion 10 shown in FIG.
When 6 flows in and contacts the electrodes 12 and 15 facing each other in the pixel portion, the electrodes 12 and 15 facing each other are electrically connected to each other. Opposing electrodes 12 and 15 of the pixel portion
If electrical conduction occurs between them, normal image display cannot be performed.

On the other hand, as shown in FIG.
In JP-A-350626, a resin layer or the like is formed on the seal portion 10 of the substrate before forming the electrodes and the electrode terminal portions, the substrate gap in the seal portion is made smaller than the substrate gap in the display area A, and the seal is formed. The particle size of the conductive particles 16 mixed in the agent 17 is also the substrate gap d in the display area A.
There is disclosed a liquid crystal display panel having a structure in which even if the conductive particles 16 flow out to the display area A side by making the size smaller, a short circuit does not occur between the electrodes of the upper and lower substrates. However, in this structure, since a step is formed in the electrode terminal 15a portion, there is a risk of disconnection between the electrode and the electrode terminal, and as a countermeasure, a step such as stepping the step to reduce one step is taken. Is required, and a complicated manufacturing process is required in manufacturing.

An object of the present invention is to provide a liquid crystal display panel in which both substrates are attached with an anisotropic conductive sealant mixed with conductive particles, and the conductive particles flow out to the display area side inside the seal portion. An object of the present invention is to provide a liquid crystal display panel that prevents a short circuit between electrodes of a substrate.

Another object of the present invention is to provide a method for manufacturing a liquid crystal display panel in which a conductive layer having elasticity is easily provided on a sealing portion of a substrate in order to prevent the conductive particles from flowing out. .

[0014]

In a liquid crystal display panel of the present invention, a pair of substrates each having at least electrodes in a display region and electrode terminal portions in a non-display region connected to the electrodes are opposed to each other. As a result, while a certain gap is maintained, the sealant around the display area is adhered by the conductive particle-containing sealant, and the connection terminal of one substrate is electrically connected to the electrode terminal of the other substrate. In the connected liquid crystal display panel, a conductive particle outflow preventing means for preventing conductive particles of the sealant containing conductive particles from flowing out to the display area side is provided in the seal portion.

If the conductive particle outflow preventing means is a conductive particle barrier provided on the display area side of the conductive particle-containing sealant, it can be provided by a simple process.

As the conductive particle barrier, a thermosetting resin or an ultraviolet curable resin containing no conductive particles can be used.

The conductive particle outflow preventing means may be an uneven area formed on at least one of the substrates on the display area side of the conductive particle-containing sealant.

The display area of at least one of the pair of substrates is formed in a convex shape, and the gap between the pair of substrates on the side of the display area in the seal portion is narrower than the gap between the substrates in the sealant portion containing conductive particles. Has been done.

The conductive particle outflow prevention means may be an elastic conductor layer provided at a contact portion of at least one of the pair of substrates with the conductive particle-containing sealant.

The gap between the seal portions of the pair of substrates is narrowed by the conductor layer, the particle size of the conductive particles corresponds to the gap narrowed by the conductor layer, and the display of the pair of substrates is performed. It is formed smaller than the gap between the regions.

According to the method of manufacturing a liquid crystal display panel of the present invention, a pair of substrates each having at least an electrode in a display region and an electrode terminal portion in a non-display region connected to the electrode are provided with a constant gap so that the electrodes face each other. In a manufacturing method of a liquid crystal display panel, which is held and adhered with a sealant containing conductive particles in a seal portion around the display area, and an electrode terminal portion of the other substrate is electrically connected to a connection terminal portion of one substrate. There, a conductor paste is applied onto the connection terminals or electrode terminals in at least one of the seal portions of the pair of substrates, and the conductor paste is dried and then a sealant containing conductive particles is applied to the pair of substrates. It is characterized by being attached.

A resilient conductive layer can be easily formed by vapor-depositing a resilient metal instead of applying the conductive paste.

[0023]

According to the present invention, since the means for preventing the conductive particles mixed in the sealant from flowing out to the display area side is provided, the pair of substrates are attached by the sealant containing the conductive particles. Even if the electrode terminals of the other substrate are connected to the connection terminals of the other substrate at the same time as the attachment, the conductive particles are prevented by the prevention means and do not flow out to the display region side. Therefore, there is no short circuit between the electrodes of the pair of upper and lower substrates,
The product yield can be improved.

As a means for preventing the outflow of conductive particles,
By using the conductive particle barrier, it is possible to prevent the conductive particles from flowing out to the display region side and prevent a short circuit between the electrodes. If a thermosetting resin or ultraviolet curable resin containing no conductive particles mixed therein is used as the conductive particle barrier on the display area side of the sealant containing conductive particles, it can be provided in the same step as the sealant containing conductive particles. As a result, the number of steps does not increase, and the number of sealing layers increases, so that the adhesion of both substrates is improved.

As a means for preventing the outflow of conductive particles, for example, when an uneven area is provided on the surface of a substrate, the uneven area can be formed by a simple etching process or a sandblasting step, and the conductive particles are displayed by friction of the uneven area. It is possible to prevent invasion into the area side.

Further, when the substrate gap of the seal portion is made larger than the substrate gap of the display area and the particle size of the conductive particles is increased, it is possible to prevent the conductive particles from flowing out to the gap of the narrow display area.

Further, by providing the elastic conductor layer on the connection terminal and / or the electrode terminal of the seal portion, the elastic conductor layer plays a cushioning role, and the elastic conductor layer is formed. A dent is formed, and the conductive layer is wrapped around the conductive particles, so that the conductive particles can be prevented from flowing out.

Further, by providing such a conductive layer thick and reducing the particle diameter of the conductive particles in accordance with the narrowed gap, even if the conductive particles flow out to the display area side, The substrate gap on the side is larger than the particle size of the conductive particles, and the conductive particles do not short-circuit between the electrodes of both substrates.

Further, according to the manufacturing method of the present invention, since the conductor paste such as silver paste or carbon paste is applied and then dried to remove the solvent, the conductor layer having elasticity can be easily formed. It's easy.

By providing an elastic metal by vapor deposition instead of applying the conductive paste, it is possible to easily obtain a conductive layer having elasticity as well, and the conductive particles can be applied to the display area side. Outflow can be prevented.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a liquid crystal display panel of the present invention and a manufacturing method thereof will be described with reference to the drawings.

[Embodiment 1] FIG. 1 is a sectional explanatory view of a first embodiment of a liquid crystal display panel of the present invention. In FIG.
11 to 18 are the same parts as those shown in the conventional example.
Reference numeral 1 is a conductive particle barrier which is a means for preventing the outflow of conductive particles, and is, for example, a second sealant. Since the conductive particle barrier 1 is in direct contact with the liquid crystal material, a material having a low reactivity with the liquid crystal material, for example, a second sealant made of the same material as the sealant 17 and containing no conductive particles, that is, A thermosetting epoxy resin or an ultraviolet curable resin (generally, acrylic or epoxy is used as a main component and radical polymerization is used for polymerization) or the like is used.

In the liquid crystal display panel of this embodiment, a pair of substrates on which electrodes in the display area and electrode terminals in the non-display area connected to the electrodes are formed, and a seal containing conductive particles is provided around the display area A. In the conventional liquid crystal display panel adhered with the agent 17, a sealant 1 containing conductive particles is provided.
7 is characterized in that the conductive particle barrier 1 is provided in the seal portion 10 around the display area A on the inside of 7, that is, on the display area A side. If the conductive particle barrier 1 is in a range that does not enter the display area A on the inner side (display area A side) of the conductive particle-containing seal material 17, the conductive particle-containing seal material 1
It may be in contact with or apart from 7. Since the liquid crystal material 19 is injected into the gap between the substrates in the display area A, the conductive particle barrier 1 defines the liquid crystal material injection area and comes into contact with the liquid crystal material 19 after the injection of the liquid crystal material 19.
Therefore, it is preferable that the material used for the conductive particle barrier 1 has low reactivity with the liquid crystal and can be attached to the substrate. In particular, the same type of sealing agent that is simultaneously cured in the pressure bonding step of curing the sealing agent 17 is preferable, but the present invention is not limited to this, and a combination of different materials such as an ultraviolet curable resin and a thermosetting resin may be used.

No conductive particles are mixed in the conductive particle barrier 1, and by using a material having an adhesive force, the adhesive force between the substrates 11 and 14 is further ensured and the seal containing the conductive particles is provided. Conductive particles 16 from agent 17
Has a function of blocking the outflow to the display area A side.

Next, a method for manufacturing the liquid crystal display panel shown in FIG. 1 will be described. First, a spacer 18 (for adjusting a panel gap of a liquid crystal display panel) is provided on one of the pair of substrates 11 and 14 provided with electrodes 12, 15 and connection terminals 13 and electrode terminals 15a on the surface thereof. , For example, Sekisui Fine Chemical Company's trade name plastic beads). On the other substrate 14, the sealing agent 17 in which the conductive particles 16 are mixed is attached to the electrode terminal 1
Apply on 5a. Generally, a method such as screen printing, a dispenser, or transfer is used as the application method. The material of the sealant 17 is generally a thermosetting epoxy resin or an ultraviolet curable resin (generally, acrylic or epoxy is used as the main component and radical polymerization is used for the polymerization). After the sealant 17 is applied on the electrode terminals 15a, the conductive particle barrier 1 of the first embodiment is applied to the inside of the sealant 17 (display area A side). The conductive particle barrier 1 is applied by a dispenser method or a transfer method, which can be applied locally, because it must be applied so as not to disturb the shape and performance of the sealant 17 applied previously. Substrates 11 and 14 that have undergone the above steps are superposed so that the electrodes (segments) on the surface of the substrates face each other, and then pressure-bonded by heat or ultraviolet rays to form a panel.

[Embodiment 2] FIG. 2 is an explanatory view of a pattern of upper and lower substrates 11 and 14 according to a second embodiment of the liquid crystal display panel of the present invention. FIG. 3 shows the upper surface of the panel and its assembly. It is explanatory drawing of the BB line cross section. Figures 2-3
The substrate 11 shown in FIG. 1 has a pixel electrode 12 and a connection terminal 13 formed on the surface thereof, inside the portion where the sealant 17 is printed, outside the display area A, parallel to the pixel electrode 12, and ground glass. Alternatively, conductive particles 1 processed into a lattice shape (for example, hydrofluoric acid treatment or mechanical surface polishing)
An uneven area 3 is formed as an outflow preventing means 6. Similarly to the above-mentioned one substrate 11, the other substrate 14 is also provided with the concavo-convex region 5 which is processed in parallel with the pixel electrode 15 in a ground glass shape or a lattice shape (for example, hydrofluoric acid treatment or mechanical surface polishing). There is. The substrate 11 and the substrate 14 are superposed on each other in the same manner as in the conventional technique, and are attached by the sealant 17 around the display area A to assemble the liquid crystal display panel shown in FIG. The structure of the liquid crystal display panel according to the present embodiment has a conductive particle outflow prevention means in which the seal portion around the display area A is processed into a ground glass shape or a lattice shape (for example, hydrofluoric acid treatment or mechanical surface polishing). Is characterized in that the uneven regions 3 and 5 are provided. Other configurations are the same as those in the first embodiment.

According to the present embodiment, between the seal portion and the display area, ground glass or a grid pattern is formed, and
Since the uneven region having a depth of about 1 to 2 μm is formed, the conductive particles 16 are inside the seal part (the display region A side) from the sealing agent 17 in which the conductive particles 16 are mixed due to the friction of the uneven part. 2) can be prevented, a short circuit between the pixel electrodes 12 and 15 of the upper and lower substrates 11 and 14 can be prevented, and the yield of the liquid crystal display panel can be improved.

Further, according to the present embodiment, the ground glass or lattice-like processing can be easily formed by etching or sandblasting by masking in the state of the substrate before forming the pixel electrodes 12, 15 and the like. The concavo-convex region can be formed by a simple process, and the conductive particles can be prevented from flowing out.

[Embodiment 3] FIG. 4 is a sectional view showing a liquid crystal display panel according to a third embodiment of the present invention. In this embodiment, the other substrate 14 is formed in a convex shape in the display area A, and the gap D between the two substrates 11 and 14 in the seal portion 10 is wider than the gap d between the two substrates 11 and 14 in the display area A. Is formed. Although the tapered step 6 is formed in the example shown in FIG. 4, the step 6 may not be tapered and may be formed by one step or a plurality of steps. This embodiment uses this substrate 1
4 on the electrode 15 and the electrode terminal 1 in the same manner as in the first embodiment.
5a and the like are formed. Other configurations are the same as those in the first embodiment.

As a method of forming only the display area A of the substrate 14 in a convex shape in this way, for example, when the display area A is masked and the substrate is a glass plate, etching is performed by chemical treatment, sandblasting, or the like. It can be easily formed by polishing glass by machining.

The manufacturing method of the liquid crystal display panel of this embodiment shown in FIG. 4 is a sealing agent in which the display area is a convex portion and the conductive particles 16 are mixed in the sealing portion 10 of the substrate 14 on which the pixel electrodes 15 are formed. 17 is applied and the panel is assembled in the same manner as in Example 1. If the gap between the display areas A of the panel is d and the gap between both substrates of the seal portion 10 is D, then d <D holds. The particle size of the conductive particles 16 is selected to be larger than D. The particle size of the conductive particles 16 is the panel gap d in the display area A.
Larger than the display area A from the end of the seal portion 10
Since it has the step portion 6 formed in a taper shape in the direction,
The conductive particles 16 do not enter the display area A.

By forming the substrate 14 in the shape of this embodiment, the same effect as that of the first embodiment can be obtained. Further, by flattening the seal portion 10, it is possible to form a highly reliable liquid crystal display panel without disturbing the panel gap.

[Embodiment 4] FIG. 5 is a pattern diagram of upper and lower substrates according to a fourth embodiment of the liquid crystal display panel of the present invention.
FIG. 6 shows a partially enlarged view of the seal portion of the liquid crystal display panel when assembled from the side. The width of the conductor paste 7 applied on the substrate 11 is about 1 mm, which is the same as the seal width after pressure bonding, and the application place is the same as the place where the sealant is printed. Further, the conductor paste 7 on the end of the substrate on which the connection terminals 13 are formed is applied only on the connection terminals 13. The conductor paste 7 is applied on the substrate 14 as well as on the substrate 11. Here, the material of the conductor paste 7 applied to both substrates is the substrate 1
A material that is softer than 1 and 14 or the conductive particles 16 and that is a conductor (for example, a silver paste or a carbon paste) is used. Since the conductive paste 7 is present, the particle size of the conductive particles 16 is smaller than that of the panel gap d. Other configurations are the same as those shown in the first embodiment.

Next, a method of manufacturing the liquid crystal display panel shown in FIG. 6 will be described. First, the pixel electrodes 12 and 15 are formed on the surface.
Spacers 18 are sprinkled on one of the pair of substrates 11 and 14 provided with. After that, the conductor paste 7 is applied as described above. In order to apply the above-described conductor paste 7 with high accuracy, a screen printing method with relatively high printing accuracy or a dispenser method with high cleanliness is used as the application method. After applying the conductor paste 7 to the substrate 11, the conductor paste 7 is dried. The conductor paste 7 is applied to the other substrate 14 by the same method as described above and dried. After the conductor paste 7 is dried, the sealant 17 mixed with the conductive particles 16 is applied onto the conductor paste 7 by screen printing or a dispenser. Subsequent assembly of the panel is performed in the same manner as in the first embodiment.

In the structure of the liquid crystal display panel shown in FIG. 6 of the present embodiment, since the conductive material layer 7a in which the paste is hardened is provided on the upper and lower parts of the applied sealant 17, the conductive material 7a becomes conductive at the time of pressure bonding. It acts as a cushion that receives the pressure applied to the particles 16. Therefore, the connection terminal 13
By providing the conductor layer 7a on the upper side, the conductive particles 16 are prevented from flowing out to the display area A inside the sealant 17 at the time of pressure bonding. In addition, the conductive particles 16
Since the particle size is smaller than the panel gap d in the display area, even if the conductive particles 16 flow out into the display area A, the electrodes 12 and 15 of the upper and lower substrates 11 and 14 are not electrically connected. As a result, electrical conduction between the electrodes facing each other in the display area A can be prevented, and the yield of the liquid crystal display panel can be improved. Further, by adopting a structure having a relatively soft conductor layer, the upper and lower substrates 1
The conduction between the terminals 13 and 15a of the terminals 1 and 14 can be ensured.

In this embodiment, the conductor layer 7 having elasticity is formed by applying the conductor paste 7, but a material softer than the conductive particles 16 and other than the above may be used as long as it is a conductor. . For example, even if a soft elastic metal such as pure gold or platinum is provided in the same shape as the conductive paste by vapor deposition or the like, a conductive layer having similar elasticity can be obtained, and the same effect as described above can be obtained. To be

In this embodiment, the thickness of the conductor layer 7a is set to, for example, about 1.5 to 2 μm, and the conductive particles 16 mixed in the sealant 17 are set to the conventional 4.5 μm.
From the example described above, the size is reduced to about 2.5 to 3 μm.
The thickness of the conductor layer 7a is, for example, about 1 to 2 μm, and the conductive particles 16 mixed in the sealant 17 have a conventional thickness of 4 μm.
Even if it is kept as it is, since the conductive layer 7a has a recess due to the elasticity of the conductive layer 7a and the conductive particles 16 are embedded therein, it is not always necessary to reduce the particle size of the conductive particles 16. Also, the conductive particles 16 do not flow out from the seal portion to the display area A.

[0048]

Since the present invention is configured as described above, it has the following effects.

Arbitrary conductive particle barriers (for example, glass, plastics, rubber, metal, ceramics, etc.) are provided inside the sealant of the substrate and outside the display area, and irregularities such as frosted glass are provided on the substrate surface. By providing a step or a step such as a taper in the seal part, it is possible to prevent unnecessary conductive particles from flowing from the sealant between the pixel electrodes in the display area (liquid crystal holding area). To prevent the occurrence of a defect in which the pixel electrodes facing each other are electrically connected to each other. This improves the yield of the liquid crystal display panel and leads to cost reduction.

Further, by providing a conductor paste or a conductor layer made of a relatively soft metal on the portion of the substrate that is in contact with the sealant, the pressure applied to the conductive particles at the time of pressure bonding can be absorbed. The conductive particles of No. 2 flow out to the display region side, and a defect in which the electrodes facing each other are electrically connected does not occur. Further, since the conductive particles are embedded in the conductor layer during pressure bonding, more reliable electrical conduction is secured.
This improves the yield of the liquid crystal display panel and leads to cost reduction.

Further, by thickening the conductor layer to reduce the particle size of the conductive particles mixed in the sealant, even if the conductive particles flow out to the display area side, a short circuit occurs between the electrodes of the upper and lower substrates. There is no such thing.

In order to form an elastic conductor layer, an electrically conductive paste is applied and dried, or an elastic soft metal is vapor-deposited to easily obtain an electrically conductive layer. The above-mentioned effects are achieved.

As described above, the effect of the present invention remarkably contributes to the productivity of the liquid crystal display panel using the anisotropic conductive seal.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view of a structure of a liquid crystal display panel according to a first embodiment of the present invention.

FIG. 2 is a pattern diagram of upper and lower substrates of a second embodiment of the liquid crystal display panel of the present invention.

3A and 3B are explanatory views of a plane and a cross section of Example 2 of the liquid crystal display panel of the present invention.

FIG. 4 is a sectional explanatory view of a structure of a liquid crystal display panel according to a third embodiment of the present invention.

FIG. 5 is a pattern diagram of upper and lower substrates of Example 4 of the liquid crystal display panel of the present invention.

FIG. 6 is an explanatory cross-sectional view of a liquid crystal display panel according to a fourth embodiment of the present invention in the vicinity of a seal portion.

FIG. 7 is a cross-sectional explanatory view of a structure of a liquid crystal display panel using a conventional anisotropic conductive seal.

FIG. 8 is a cross-sectional explanatory view of another structure of a liquid crystal display panel using a conventional anisotropic conductive seal.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 conductive particle barrier, 3, 5 uneven | corrugated area | region, 6 level | step difference part, 7 conductor paste, 7a conductor layer, 10 sealing part, 11, 14 board | substrate, 12, 15 pixel electrode, 1
3 connection terminals, 15a electrode terminals, 16 conductive particles,
17 Sealant, A display area.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Numano 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Material Devices Research Laboratory (72) Inventor Tomio Kawato 8-1-1 Tsukaguchihonmachi, Amagasaki Mitsubishi (72) Inventor Hideaki Otsuki 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation

Claims (9)

[Claims] 1. A pair of substrates, each having at least an electrode in a display region and an electrode terminal portion in a non-display region connected to the electrode, formed in the display region with a constant gap so that the electrodes face each other. Along with the sealant containing conductive particles at the seal part around,
A liquid crystal display panel in which an electrode terminal portion of the other substrate is electrically connected to a connection terminal portion of one substrate, wherein conductive particles of the conductive particle-containing sealant flow out to the display area side. A liquid crystal display panel, wherein a conductive particle outflow preventing means for preventing the outflow is provided in the seal portion. 2. The liquid crystal display panel according to claim 1, wherein the conductive particle outflow preventing means is a conductive particle barrier provided on the display area side of the conductive particle-containing sealant. 3. The liquid crystal display panel according to claim 2, wherein the conductive particle barrier is a thermosetting epoxy resin or an ultraviolet curing resin in which conductive particles are not mixed. 4. The liquid crystal display panel according to claim 1, wherein the conductive particle outflow prevention means is an uneven area provided on the display area side of the sealant containing conductive particles on at least one side of the substrate. 5. The display area of at least one of the pair of substrates is formed in a convex shape, and the gap of the pair of substrates on the side of the display area in the seal portion is larger than the gap of the substrate in the sealant portion containing conductive particles. The liquid crystal display panel according to claim 1, which is narrowly formed. 6. The conductive particle outflow preventing means is an elastic conductor layer provided at a contact portion of at least one of the pair of substrates with the sealant containing conductive particles. LCD display panel. 7. The gap between the seal portions of the pair of substrates is narrowed by the conductor layer, and the particle size of the conductive particles corresponds to the gap narrowed by the conductor layer, and the pair of substrates. 7. The liquid crystal display panel according to claim 6, wherein the liquid crystal display panel is formed to be smaller than the gap between the display areas. 8. A pair of substrates, each having at least an electrode in a display region and an electrode terminal portion in a non-display region connected to the electrode, are surrounded by a constant gap so that the electrodes face each other. A method for producing a liquid crystal display panel, which comprises affixing a conductive particle-containing sealant at a sealing part of the substrate, and electrically connecting the electrode terminal part of the other substrate to the connection terminal part of the one substrate. A method of manufacturing a liquid crystal display panel, in which a conductive paste is applied on the connection terminals or electrode terminals in at least one of the seal portions, the conductive paste is dried, and then a sealant containing conductive particles is applied, and the pair of substrates are attached. . 9. The method of manufacturing a liquid crystal display panel according to claim 8, wherein an elastic metal is vapor-deposited instead of applying the conductor paste, and then a sealant containing conductive particles is applied to form the pair of substrates. The manufacturing method of the liquid crystal display panel to be attached.