JPH06160871A - Liquid crystal display panel and its production - Google Patents

Liquid crystal display panel and its production

Info

Publication number
JPH06160871A
JPH06160871A JP31682492A JP31682492A JPH06160871A JP H06160871 A JPH06160871 A JP H06160871A JP 31682492 A JP31682492 A JP 31682492A JP 31682492 A JP31682492 A JP 31682492A JP H06160871 A JPH06160871 A JP H06160871A
Authority
JP
Japan
Prior art keywords
liquid crystal
display panel
crystal display
viscous fluid
substrates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP31682492A
Other languages
Japanese (ja)
Inventor
Katsuji Hattori
Hirobumi Wakemoto
Yoshinori Yamamoto
博文 分元
義則 山本
勝治 服部
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP31682492A priority Critical patent/JPH06160871A/en
Publication of JPH06160871A publication Critical patent/JPH06160871A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1341Filling or closing of cells
    • G02F2001/13415Drop filling process

Abstract

(57) [Summary] [Object] To provide a structure of a liquid crystal display panel which can improve the reliability and durability of the liquid crystal display panel and can be manufactured by a simple process, and a manufacturing method of the panel. In a liquid crystal display panel having a structure in which liquid crystal is held between two substrates, the peripheral portions of at least two substrates having electrodes are joined by two or more kinds of sealing materials, and at least the liquid crystal among the sealing materials is used. The sealing material that directly contacts with and seals the liquid crystal is a viscous fluid 13 inert to the liquid crystal, and at least one adhesive sealing material 14 for holding the substrate is formed outside the viscous fluid 13. A liquid crystal display panel characterized in that By arranging the viscous fluid 13 inert to the liquid crystal in the sealing material in contact with the liquid crystal, the liquid crystal characteristic is not deteriorated compared with the conventional case when the liquid crystal display panel is manufactured, and the display characteristic of the liquid crystal display panel is high. Reliability can be improved. Also,
By sealing and sealing the liquid crystal with the viscous fluid 13, the control margin of the amount of dropped liquid crystal is expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is thin and lightweight and has low power consumption among OA and image display devices.
The present invention relates to a liquid crystal display panel that is widely used in pocket televisions, various instruments, displays for notebook computers, etc., and a manufacturing method thereof.

[0002]

2. Description of the Related Art A liquid crystal display panel has a liquid crystal of several μm to 10 μm.
The structure is such that two electrode substrate plates are sandwiched so as to have an interval of μm, and the inner periphery of the edge of the electrode substrate is sealed with an organic resin. A thermosetting resin or a photocurable resin is used as the sealing material in terms of reliability and workability.

Generally, in the method of manufacturing a liquid crystal display panel, as shown in FIG. 3, a thermosetting or photocurable sealing material 32 is injected into one substrate 31 in step (a). Printing is carried out, the two electrode substrates 31 and 33 are adhered to each other in the step (b) to form an empty panel in which the sealing material 32 is hardened, and the liquid crystal 34 is poured in vacuum in the step (c). There is a vacuum injection method of injecting from the inlet and sealing the inlet with the sealing resin 35 in the step (d). However, in the manufacture of a liquid crystal display panel by this method, the injection speed of the liquid crystal is slow due to the narrow gap of the empty panel prepared in advance and the viscosity of the liquid crystal, and the injection of the liquid crystal panel takes a long time as the panel becomes larger. Productivity is poor. Further, this method requires a step of sealing the injection port wet with the liquid crystal. Therefore, in order to improve productivity and simplify the process, as shown in FIG. 4, a photo-curable sealing material 42 is screen-printed on one substrate 41 in step (a) (no injection port is provided), and (b) is used. ) Step, a certain amount of liquid crystal 43 is dropped onto the substrate 41, and in step (c), the two substrates 41,
A drop injection method is used, in which 44 is attached, and in the step (d), the display unit is covered with a mask 45 so as not to be irradiated with light and the thermosetting seal 42 is cured by light irradiation.

[0004]

However, the drop injection method has a problem that the uncured sealing material, which has a bad influence on the liquid crystal when the substrates are bonded, comes into contact with the liquid crystal. Also,
The photo-curing resin has a lower bonding force to the substrate than the thermosetting resin, and has a problem in shock and long-term reliability.
A photo-curing resin having a strong adhesive force has also been developed, but a resin having a stronger adhesive property has a greater effect on the liquid crystal, and the following measures are required. For example, a method of forming a double seal structure in which a photo-curing resin that has little influence on the liquid crystal is used on the inner side that is in contact with the liquid crystal and a photo-curing resin having a strong adhesive force is combined on the outer side thereof, and JP-A-2-228626 As disclosed in the publication, a method is adopted in which a frame having a small influence on the liquid crystal is formed in advance, and then an adhesive resin is arranged on the outer side of the frame to bond the substrates. However, in both cases, since the sealant and the liquid crystal are in contact with each other, the light necessary for curing the photo-curable sealant is always applied to the liquid crystal near the seal,
The liquid crystal characteristics deteriorate. In the latter case, a highly accurate process of uniformly forming an inactive frame in the liquid crystal with a height accuracy of several μm necessary for forming a gap is required.

In addition, in the drop injection method, precise control of the drop liquid crystal amount is also required. That is, when a larger amount of liquid crystal is dropped than the cell volume formed by both substrates and the sealing material, the panel after bonding is formed to be thicker than a predetermined gap, or excess liquid crystal breaks through the sealing material and is exposed to the outside. Spill to. Further, when a small amount of liquid crystal is dropped from the cell volume, the space between the substrates is held by the spacers and the liquid crystal can hardly be contracted, and the shortage of liquid crystal becomes bubbles, so the liquid crystal dropping amount must be controlled accurately. I won't.

The present invention is intended to solve the above problems, and in the dropping injection method capable of manufacturing a liquid crystal display panel with high productivity, the sealing material does not affect the liquid crystal and the reliability and durability of the panel are improved. The present invention provides a new manufacturing method having features such as high cost, wide control margin of the amount of dropped liquid crystal, and simplification of the process, thereby providing a liquid crystal display panel having a completely new structure. That is the purpose.

[0007]

In order to achieve this object, the liquid crystal display panel of the present invention has a structure in which two substrates are joined by two or more kinds of sealing materials and liquid crystal is held between the two substrates. In the provided liquid crystal display panel, at least the sealing material that is in direct contact with the liquid crystal is a viscous fluid that is inactive to the liquid crystal, and an adhesive sealing material for holding the substrate is formed outside the viscous fluid. There is.

Further, in the method for manufacturing a liquid crystal display panel of the present invention, a viscous fluid is disposed on the peripheral portion of at least one of the two electrode-attached substrates, and the liquid crystal is fixed on the at least one electrode-attached substrate. Dropwise, bond with the other electrode-attached substrate in a vacuum, seal the liquid crystal, and then apply at least one adhesive resin to the entire outer periphery of the viscous fluid part,
A liquid crystal display panel is manufactured by curing.

[0009]

In the liquid crystal display panel of the present invention, the sealing material that comes into contact with the liquid crystal has a chemical resistance, and by using a viscous fluid that does not cause a chemical change before and after the panel is manufactured, the characteristic deterioration of the liquid crystal that occurs during the panel manufacturing is suppressed. Therefore, the reliability of the display characteristics of the liquid crystal panel is improved.

Since the dropped liquid crystal is sealed with the viscous fluid at the time of bonding, the control margin for the amount of the dropped liquid crystal is widened, and the liquid crystal is sealed with the chemically stable viscous fluid and hermetically sealed to form a sealing material for covering the outside. An adhesive resin having strong adhesiveness and good processability can be used, and the sealing material curing process can be simplified. Further, it becomes possible to use an adhesive containing a solvent which has a strong influence on the liquid crystal or an additive such as a silane coupling material which enhances the adhesive strength, and the durability of the panel is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display panel and a method of manufacturing the same according to embodiments of the present invention will be described below with reference to the drawings.

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a cross-sectional view of a liquid crystal display panel according to an embodiment of the present invention is shown. This panel basically has a transparent electrode or a thin film transistor layer (not shown) made of ITO (indium oxide) or the like formed on the surface thereof, and an alignment film (not shown) made of polyimide or the like formed on the transparent electrode or the thin film transistor layer. Since the spacers (not shown) are dispersed in the portion, the two substrates 12 are bonded to each other so as to keep a constant distance. A liquid crystal 11 is filled between the substrates, and a viscous fluid 13 containing a spacer (not shown) as a sealing material that is in contact with the liquid crystal 11 is arranged. The viscous fluid 13 has two substrates 12 on the outer periphery thereof. The adhesive resin 14 for holding the liquid crystal panel is applied.

FIG. 2 is a schematic view showing an example of a manufacturing process of the liquid crystal display panel of the present invention. First, in step (a), a transparent electrode and an alignment film layer (not shown) are formed,
A viscous fluid 22, which is a silicon-based resin (Dow Corning: grease for high vacuum) containing a spacer (not shown) having a diameter that determines the gap between the liquid crystal panels, is applied to the substrate 21 that has been subjected to the alignment treatment so as to surround the display portion. Apply to. The silicon-based resin viscous fluid 22 is not exposed to various chemicals and is inert to the liquid crystal. Then, in the step (b), the liquid crystal 24 having the same volume as the space in which the liquid crystal is enclosed is dripped into the region surrounded by the applied viscous fluid 22 by using the liquid constant volume discharge device (dispenser) 23. At this time, the liquid crystal material also includes a spacer (not shown) that forms a gap between the substrates. In steps (c) and (d), the viscous fluid 2 is placed in the decompression tank 25 at a pressure of about 0.1 Torr.
2 and a substrate 26 facing the substrate 21 coated with the liquid crystal 24.
Stick together. Then, in step (e), a cyanoacrylate adhesive (Toagosei Kagaku: Aron Alpha) 28, which cures at room temperature and has a short curing time, is dispensed on the entire outer circumference of the viscous fluid 22 as an adhesive resin between the bonded substrates. It was applied at 27. In the step (f) in which the adhesive resin is cured, the liquid crystal display panel of the present invention is completed.

In the panel of this embodiment having the above structure,
It occurs when manufactured by the conventional method. The alignment disorder of the liquid crystal did not occur at the interface between the liquid crystal and the sealing material due to the effects of the uncured resin and light irradiation. Further, in the conventional method, the physical properties such as the specific resistance and the transition point of the liquid crystal are lowered after the panel is manufactured, but in the manufacture of the panel of the present example, the change in the physical property of the liquid crystal is not observed, and it is used as a seal at that time. Since the viscous fluid exhibits fluidity with respect to stress, it is easy to form a gap in the bonding process, and moreover, in the conventional method, the dropped liquid crystal that should be controlled with an accuracy of about ± 5% with respect to the cell volume. The amount is ± 1 in the panel of this example.
Even when the dropping amount was controlled to 0%, liquid crystal outflow and bubbles did not occur. Further, in the conventional method, a process such as heat curing of the sealing resin or ultraviolet irradiation curing is required, but in the manufacturing method of the present embodiment, the curing process is simplified by using the room temperature curing adhesive.

In this embodiment, a silicone resin is used as the viscous fluid, but a chemically and physically stable fluororesin (Teflon grease or the like) does not adversely affect the liquid crystal and the same result is obtained. was gotten.

As the adhesive resin, not a cyanoacrylate adhesive having good processability but an epoxy adhesive or a phenol adhesive having a strong adhesive force, or a solvent and a silane coupling agent having a strong influence on liquid crystals. It is also possible to use an adhesive with an adhesive strength enhancer added, such as a photo-curable adhesive as the adhesive resin, and even when photo-curing, a viscous fluid is generated between the photo-curable resin and the liquid crystal. Since it exists, the liquid crystal can be completely masked, and the liquid crystal is not irradiated with the irradiation light so that the liquid crystal is not deteriorated.

Further, the adhesive resin having a low viscosity was able to better cover the outer periphery of the viscous fluid by the capillary phenomenon due to the narrow gap between the substrates.

[0018]

As described above, according to the liquid crystal display panel and the method of manufacturing the same of the present invention, the viscous fluid inert to the liquid crystal is disposed in the sealing material in contact with the liquid crystal, so that the conventional liquid crystal display panel can be manufactured. In comparison, the liquid crystal characteristics are not deteriorated, and the display characteristics of the liquid crystal display panel can be made highly reliable. Further, since the liquid crystal is sealed and sealed with the viscous fluid, the margin of the dropped liquid crystal amount is widened. An adhesive having a strong adhesive force and a simple curing process, which is harmful to liquid crystals, can also be used as an adhesive for liquid crystal panels, and a highly durable panel can be manufactured by a simple process.

[Brief description of drawings]

FIG. 1 is a sectional view showing a liquid crystal display panel of an embodiment of the present invention.

FIG. 2 is a process schematic diagram showing an example of manufacturing a liquid crystal display panel of the present invention.

FIG. 3 is a schematic view of a process of manufacturing a conventional liquid crystal panel by a vacuum injection method.

FIG. 4 is a schematic view of the steps of manufacturing a conventional liquid crystal panel by a drop injection method.

[Explanation of symbols]

 11 Liquid Crystal 12 Substrate 13 Viscous Fluid 14 Adhesive Resin 21 Substrate 22 Viscous Fluid 23 Dispenser 24 Liquid Crystal 25 Decompression Tank 26 Counter Substrate 27 Dispenser 28 Adhesive Resin

Claims (4)

[Claims]
1. A liquid crystal display panel in which the peripheral portions of two substrates having electrodes are joined by two or more kinds of sealing materials and liquid crystal is held between the two substrates. A liquid crystal characterized in that a sealing material for touching and sealing the liquid crystal is a viscous fluid inert to the liquid crystal, and an adhesive sealing material for holding the substrate is formed outside the viscous fluid. Display panel.
2. The liquid crystal display panel according to claim 1, wherein a silicone resin or a fluorine resin is used as the viscous fluid.
3. A viscous fluid is placed on the peripheral portion of at least one of the two substrates having electrodes, a certain amount of liquid crystal is dropped on the substrate, and the other substrate with electrodes is bonded in vacuum. After that, at least one kind of adhesive resin is applied to the outer periphery of the viscous fluid part and cured, and the method for manufacturing a liquid crystal display panel according to claim 1.
4. The method of manufacturing a liquid crystal display panel according to claim 3, wherein a viscous fluid in which a spacer for determining a gap of the liquid crystal display panel is mixed in advance is used.
JP31682492A 1992-11-26 1992-11-26 Liquid crystal display panel and its production Pending JPH06160871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31682492A JPH06160871A (en) 1992-11-26 1992-11-26 Liquid crystal display panel and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31682492A JPH06160871A (en) 1992-11-26 1992-11-26 Liquid crystal display panel and its production

Publications (1)

Publication Number Publication Date
JPH06160871A true JPH06160871A (en) 1994-06-07

Family

ID=18081331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31682492A Pending JPH06160871A (en) 1992-11-26 1992-11-26 Liquid crystal display panel and its production

Country Status (1)

Country Link
JP (1) JPH06160871A (en)

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