KR20070120880A - Fabricating method of fpd - Google Patents

Abstract

A method for manufacturing an FPD(Flat Panel Display) is provided to realize a secure sealing effect even with use of the smallest amount of sealant, by sealing a lateral surface of a bonded glass substrate with a hot-melt sealant and performing a chemical polishing process on the bonded glass substrate. A bonded glass substrate is prepared by disposing display elements between two glass substrates(GL). A gap formed along a lateral surface of the bonded glass substrate is sealed by a hot-melt sealant. An outer surface of the bonded glass substrate, of which the gap is sealed by the sealant, is polished through contact with a chemical polishing solution containing hydrofluoric acid until the bonded glass substrate is thinned to a predetermined thickness.

Description

Manufacturing method of FPD {FABRICATING METHOD OF FPD}

BRIEF DESCRIPTION OF THE DRAWINGS The figure explaining a sealing process.

2 is a plan explanatory diagram showing one step of the sealing operation;

3 is a perspective view for explaining a comparative experiment of the adhesive force.

4 is a view for explaining a method for producing FPD.

* Explanation of symbols for the main parts of the drawings

1, 2: rotary roller 4: rotating body

5: axis of rotation 6: connecting arm

GL: laminated glass substrate PN: display panel

The present invention relates to a method for producing FPD having a chemical polishing process using a heat dissolving sealant.

Flat panel displays (herein referred to as FPDs) are terms that contrast with display devices with convexity, such as the CRT display's CRT display. There is a great feature in that the depth is small, space-saving, and there is no convexity on the display panel, and liquid crystal displays, plasma displays, organic EL displays, and the like have been put to practical use. Among FPDs, in particular, liquid crystal displays are widely used not only for television receivers but also for display devices such as mobile phones and computer equipment.

By the way, based on the request of weight reduction and thickness reduction of a liquid crystal display, in recent years, the method of chemically polishing the laminated glass substrate which comprises a liquid crystal display to the limit is employ | adopted suitably. Specifically, the 1st and 2nd glass substrates 60 and 60 which provided several display panel area | region PN ... PN are bonded together, and the circumferential edge of this laminated glass substrate GL is sealed severely. And immersed in an aqueous solution containing hydrogen fluoride (HF) to chemically polish and thin (see Figs. 4 (a) and (b)).

According to this chemical polishing method, not only can a plurality of display panels (PN ... PN) be manufactured by integrating, but also the processing speed is faster than that of mechanical polishing. In addition, since the laminated glass substrate GL can be thinned to a limit, it is possible to meet further requests for thinning and lightening the display panel PN.

In the above manufacturing method, a hydrofluoric acid-resistant sealing material SE for sealing the peripheral edge of the laminated glass substrate GL is required, but conventionally, UV curable resin has been used as the sealing material SE (patent document). One).

[Patent Document 1] Japanese Patent Application No. 2005-349714

However, the sealing material SE of this UV curable resin is not only expensive, but once cured, there is a problem that the part cannot be repaired even if a defective sealing point is found thereafter. Therefore, the laminated glass substrate which has a poor sealing point in one place may become impossible to thin further, and there exists a possibility that all the several display panels PN ... PN may become wasteful.

On the other hand, in order to avoid the problem of such a sealing failure point, there exists a tendency for coating amount to increase naturally, and even in this sense, use of UV curable resin has raised the manufacturing cost significantly. Moreover, the excess of the applied resin remained as a sharp edge after the glass substrate was thinned (see Fig. 4 (d)), and the processing was very troublesome.

From the above circumstances, it is possible to reduce the manufacturing cost, and when a sealing failure point is detected, a sealing material capable of repairing this is strongly desired. Here, in order to improve the work efficiency, (a) develop a sealing material that does not require ultraviolet irradiation, (b) reliably penetrate the gap between the laminated glass substrates and exhibit a sealing performance with a minimum application amount required. And (c) It is a point that the inspection after application | coating is also easy.

In particular, since the gap of the laminated glass substrate GL is only about 5 µm, it is necessary to examine the properties of the sealing material and the coating method based on this point.

The present invention has been made on the basis of this idea, and an object of the present invention is to provide an improved method for producing FPD so that the sealing performance can be reliably exhibited only by using a minimum necessary sealing material.

In order to achieve the above object, the present inventors have a sealing step of sealing the gap formed on the peripheral edge side of the laminated glass substrate formed by disposing the display element between the two glass substrates using a heat-dissolving sealing material; And a polishing step of polishing the outer surface of the laminated glass substrate with the gap sealed with the sealing material by contacting with a chemical polishing liquid containing hydrofluoric acid, and thinning the laminated glass substrate to a predetermined thickness. The manufacturing method of the display was completed. The plate thickness of the whole laminated glass substrate provided for a sealing process becomes like this. Preferably it is about 1.0 mm-1.4 mm, and it may become 0.5 mm or less after a grinding | polishing process.

As the heat-dissolving sealant, an adhesive is typically used. For example, among the adhesives classified into room temperature curing type, heat curing type, pressure-sensitive type, re-wetting type, and thermal melting type (thermal type), a heat melting type adhesive is appropriate. Is used. In addition, the adhesive includes not only what is understood in a narrow sense but what has adhesiveness which exhibits a predetermined sealing effect.

In any case, the sealant of the present invention is a thermoplastic adhesive, which is melted by heating, and solidified and bonded by cooling. And it is preferable that the sealing material of this invention is a colored state at normal temperature. In this case, it is especially easy to detect a defective point by the inspection after a sealing process.

In the present invention, the sealing material can be reapplied to the defective part. Furthermore, since the sealing material is thermoplastic, the sealing material can be melted again by reheating after solidification, and the sealing defective part can be repaired. Therefore, the usage-amount of the minimum necessary sealing material is enough, and manufacturing cost is reduced.

As a coloring agent, what can be visually confirmed even about 5 micrometers in thickness is selected corresponding to the clearance gap of laminated glass substrate GL. As the colorant, pigments such as rust, red and black may be used, but according to the inventor's examination, a white pigment was effective from the viewpoint of visibility. It is especially preferable to mainly use a white pigment and to add a green or red pigment to this. For white 5-3, the color of the white system which mixed green and red in 1 ratio is visual recognition, and is most effective.

As a white pigment, zincation (zinc oxide), lithopone, titanium dioxide, lead white (lead carbonate), etc. are suitable. In particular, the use of titanium dioxide is preferred. Here, although the compounding quantity with respect to the heat-dissolving adhesive agent apply | coats an adhesive agent to the clearance gap of the glass substrate of 5 micrometers in thickness, the minimum amount which can be visually recognized is selected for an application point.

Thus, although the pigment and others are contained in the adhesive agent of this invention, the softening point becomes like this. Preferably it is 60 degreeC or more and less than 100 degreeC, More preferably, it is 65 degreeC or more and less than 90 degreeC, Preferably it is 65 degreeC or more and less than 85 degreeC. . When a softening point is less than 60 degreeC, sufficient sealing effect may not be exhibited in a chemical polishing process. If the softening point is too high, the workability of the sealing treatment is impaired. Here, a softening point is the value measured by the ring-ball method on the conditions based on description of JAI (Japan adhesive industry society standard) -7. Preferably, it is measured using an automatic softening point meter.

The adhesive of the present invention preferably has a melt viscosity of 650 mPa · s or less (more preferably 400 mPa · s or less) at a melting temperature of 180 ° C., and a melt viscosity of 300 mPa at a melting temperature of 80 ° C. S or more (more preferably 400 mP · s or more). The measuring method is based on JAI-7, and melt viscosity is measured using a Brook Field type automatic viscometer (spindle No. 27, rotation speed 10 rpm). Although the sealing material of this invention adheres to the circumferential edge of a glass substrate in the molten state, when melt viscosity in melt temperature 180 degreeC exceeds 650 mPa * s, when it heats in order to acquire desired melt viscosity, The display element may be damaged. On the other hand, when melt viscosity in melt temperature 80 degreeC is less than 300 mPa * s, there exists a possibility that the sealing performance required in processing temperature ranges, such as a chemical polishing process, may not be exhibited.

In view of the workability of the sealing treatment and the permeability of the sealing material, the sealing material of the present invention is 200 to 1000 mPa · s, preferably 300 to 800 mPa · s, and more preferably 350 to 650 mPa as the viscosity of the molten state. It is performed in the range of s. If the viscosity is too low, the sealing material penetrates deeply into the glass substrate, so that the peripheral edge of the glass substrate cannot be properly sealed.

As an adhesive agent used as a sealing material of this invention, what contains paraffin type substances, such as paraffin wax, or synthetic resins, such as a thermoplastic resin, is illustrated preferably. As a paraffin type substance used here, petroleum wax and natural wax which were refine | purified from vacuum distillation distillate, vacuum distillation residual oil, and heavy oil distillate, and the compound which mix | blended resin, especially thermoplastic resin, etc. to these are mentioned. Examples of the thermoplastic resins include synthetic resins such as ethylene and vinyl acetate copolymers, petroleum resins, modified substances thereof, and the like.

Examples of the chemical polishing liquid include a hydrofluoric acid product containing hydrofluoric acid as an essential etching component, preferably 1 to 45% by weight, more preferably 1 to 35% by weight, and more preferably 1 to 25%. It is used in the concentration range of weight%. If the hydrofluoric acid concentration exceeds 45% by weight, the etching rate is increased, and the badness of the flatness of the etched glass portion is deteriorated. On the other hand, when the hydrofluoric acid concentration is less than 1% by weight, the etching rate becomes too slow, and the time required for etching becomes long.

In addition to hydrofluoric acid, it may contain at least one inorganic acid selected from hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid. In addition, from the viewpoint of preventing the reaction products such as silicides formed by etching from adhering on the glass substrate, in addition to hydrofluoric acid, carboxylic acid, phenolic, amide, fatty acid ester, phosphate ester and sulfuric acid You may contain at least 1 type or more surfactant chosen from ester type, sulfonic acid type, amine type, ether type, and high molecular alcohol. Although it does not specifically limit as a grinding | polishing rate, Usually, it carries out about 0.5-10 micrometers / minute.

In the sealing process of this invention, the clearance gap formed in the circumferential edge side surface of the laminated glass substrate which arrange | positions a display element between two glass substrates is sealed using the heat-dissolving type sealing material. Here, it is preferable that the position using a sealing material is a side surface which does not include the outer surface of the front and back of a laminated glass substrate, and it is preferable to provide in a thin strip | belt shape. Although the width | variety of a sealing material is preferable, on the other hand, when too narrow, it becomes difficult to obtain a sufficient sealing effect, and a suitable width is determined by the balance of both.

As a method of providing a sealing material in the form of a thin strip on the circumferential edge side of the laminated glass substrate, the sealing material melted in the gap between the glass substrates is dipped (immersed) in the gap between the glass substrates in a sealing material heated and melted. The method of invading and solidifying can be illustrated. When employ | adopting a dip system, it is preferable to mask the outer surface of the front and back except the side surface of a laminated glass substrate, and to provide a sealing material only in the side surface of a laminated glass substrate.

As another method of installing a sealing material in a thin strip | belt shape, it is also suitable to apply | coat a molten sealing material to the upper peripheral side surface of the upright laminated glass substrate. In this case, it is preferable to gradually discharge the molten sealing material toward the gap on the circumferential edge side in the coating operation. Moreover, it is preferable to provide the process of reheating a sealing material after the application | coating process of a sealing material. In this case, although the same process is repeated to four sides of a laminated glass substrate, a coating process and a reheating process may be continued for every one side, and after completion | finishing of four sides, you may perform reheating process for each four sides again. .

Moreover, as a method of providing a sealing material in the form of a thin strip, a sealing strip formed of a narrow strip shape or a thread of a predetermined thickness (cross section is an annular shape or a square shape) is placed on the peripheral edge side of the laminated glass substrate and heated and melted. It may be made to solidify after making it penetrate into the clearance gap of a glass substrate.

Even when employing any one of the above-described methods, an ablation step of scraping off the sealant present on the peripheral edge side of the laminated glass substrate may be provided prior to the polishing step. In this case, even if the glass substrate is thinned by the chemical polishing process anyway, the remaining sealing material does not form an edge. However, even without such an ablation step, it is possible to use a thin strip-shaped sealing material or to provide a reheating step so that there is no residue of an extra sealing material on the peripheral edge side of the laminated glass substrate.

After sealing the circumferential edge of the laminated glass substrate in this manner with a sealing material, the outer surface of the glass substrate is brought into contact with the chemical polishing liquid to polish the outer surface of the glass substrate, and the glass substrate is made thin to a predetermined thickness. As a method of contacting with a chemical polishing liquid, the method of immersing a glass substrate in a chemical polishing liquid, or apply | coating a chemical polishing liquid to the outer surface of a glass substrate, etc. are mentioned, for example.

According to the present invention, not only the ultraviolet irradiation step is required, but also the gap between the laminated glass substrates can be reliably sealed with the minimum application amount required. Moreover, even if a defective sealing point occurs, the correction can be facilitated by reheating. In the case where the sealing material is colored, detection of a location where the coating penetration amount is insufficient is particularly easy.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on an Example. The manufacturing method which concerns on an Example consists of the application | coating process of a sealing material, the reheating process of a sealing material, and the inspection process of an application | coating state. 1 (a) is a figure explaining an application | coating process.

<Application process of sealing material>

In the application | coating process of a sealing material, the automatic coating device (dispenser) in which the front rotating roller 1, the rear rotating roller 2, and the discharge nozzle part 3 were integrated is used. Specifically, the automatic coating device horizontally moves the upper portion of the laminated glass substrate GL held in the vertical state in the direction of the arrow, and the sealing material is attached to the upper peripheral edge ED of the glass substrate GL in the course of the horizontal movement. It is applied automatically.

The two rotating rollers 1 and 2 are each configured such that the rotating body 4 having a substantially U-shaped groove is rotatably held on the rotating shaft 5. And both ends of the rotating shaft 4 are hold | maintained by the connecting arm 6. Moreover, each rotating roller 1 and 2 is put on the circumferential edge ED of the laminated glass substrate, and does not roll, but keeps the circumferential edge ED of the laminated glass substrate GL loosely, and discharge nozzle part 3 is carried out. It is used for the purpose of positioning a laminated glass substrate with respect to).

The discharge nozzle part 3 is a part which discharges the sealing material of a molten state, and is connected to the tank part (not shown) which holds a sealing material in a heated state. The discharge nozzle part 3 is comprised by connecting the cylindrical main-body part 30 and the cone tip part 31, The circumference | surroundings of the cylindrical main-body part 30 are wound by the fluorine sponge rubber and the silicone rubber sheet in this order. This is for suppressing the amount of heat radiation from the discharge nozzle part 3, and for discharging a sealing material by predetermined viscosity.

The sealing material of the Example is comprised by containing the titanium dioxide which is a white pigment, in the adhesive of the thermal melting type whose softening point is 65 degreeC or more and less than 90 degreeC (optimally, 65 degreeC or more and less than 85 degreeC). And the sealing material is discharged in the heating state used as the viscosity of about 350-650 mPa * s in an Example in the state apply | coated to the peripheral edge ED of the laminated glass substrate GL. Here, the lower the viscosity, the better the permeability of the glass substrate to the gap, so that the reheating step to the sealing material can be omitted after that. However, if it is in the said viscosity range, even if a viscosity is relatively high, the permeability of a sealing material can be ensured in a subsequent reheating process.

<Reheating process>

Next, the some glass substrate (GL ... GL) which passed through the application process is accommodated in one heating chamber, and the reheating operation of a sealing material is performed. In the reheating process, only the quadrilateral edge of the laminated glass substrate is selectively heated. Therefore, it does not adversely affect the electronic element and other elements inside a laminated glass substrate.

Moreover, the softening point of the sealing material of this invention is 65 degreeC or more and less than 90 degreeC (optimally, 65 degreeC or more and less than 85 degreeC), and since a reheating process can be completed quickly, compared with the conventional manufacturing method which requires several tens of minutes of ultraviolet irradiation time. The efficiency is good. In addition, the reheating operation is performed for each side positioned at the upper side without performing the quadrilateral periphery at the same time, but the working time is shorter than when using UV curable resin.

<Inspection process>

In the inspection process, the penetration state of the sealing material can be visually confirmed. The sealing material applied in a dissolved state is naturally cooled and solidified in the process of penetrating into the gap of the glass substrate. And the tip which penetrated the sealing material normally forms the gentle broken line.

In the inspection step, this wavy tip line can be visually confirmed. And if the location where the coating amount is insufficient is detected, a maintenance operation is performed by a manual dispenser. In addition, this inspection work may be performed before a reheating process.

As mentioned above, although the 1st Example of this invention was described, the specific description content does not specifically limit this invention. For example, although the two rotating rollers 1 and 2 were used in the Example of FIG. 1 (a), what used the single rotating roller may be sufficient. In this case, Preferably, it becomes the structure only of the front rotating roller 1. Moreover, if it is the structure which can position the laminated glass substrate GL precisely with respect to the discharge nozzle part 3, it is not necessary to necessarily use a rotating roller, for example, discharges the surface holder which has a U-shaped cutout part, for example. The vehicle may be driven prior to the nozzle unit 3.

In addition, it is not necessary to make the holding | maintenance part of a laminated glass substrate correspond to a discharge nozzle part necessarily. FIG.1 (b) illustrates the structure which hold | maintains a laminated glass substrate with the holding plate 10 comprised in the cross section "H" shape. The holding plate 10 is configured to be movable up and down, and after the laminated glass substrate GL is received at the position of the coating device, the holding plate 10 is lowered to hold the laminated glass substrate loosely. Then, the sealing nozzle is apply | coated while the discharge nozzle part 3 runs in the horizontal direction on the upper surface of the holding plate 10 after that.

By the way, the holding plate 10 has a built-in heater. Therefore, the apply | coated sealing material will be hold | maintained in the reheated state for a predetermined time, and a sealing material will be fully penetrated. Therefore, according to the embodiment of Fig. 1 (b), the coating operation and the reheating operation can be continued for each sheet.

Next, the performance test which confirmed the performance of the sealing material used by said manufacturing method is demonstrated. However, the following description does not limit the scope of the present invention in any case.

EXAMPLE

1. Bonding of glass substrates

Two glass substrates (size: 50 mm x 50 mm, thickness: 0.7 mm) were bonded together using a tape paste so that a gap of about 10 m was formed between the glass substrates (hereinafter referred to as a bonded substrate).

2. sealing work

The masking tape is cut to a width of about 1 cm, and as shown in FIG. 2, the ends of the masking tape are joined together at both end positions on both surfaces of one side of the outer peripheral portion of the bonded substrate. (Both sides are protruded by about 1 cm. In addition, although the tape of the protruding part adhere | attaches mutually, it is described as non-adhesion in FIG. 2 for the convenience of drawing.)

The following sealing material is heated and melt | dissolved so that it may become a melt viscosity shown in Table 1 as a hotplate, and one side which a masking tape was stuck to is dipped under the conditions (time) shown in Table 1 in the sealing material. Then, after cooling to room temperature by air cooling and solidifying a sealing material, the part which protruded about 1 cm by both sides is cut, and the masking tape which adhered to the board | substrate is peeled off.

The above operation was performed similarly about the remaining three sides, and the four sides of the bonded substrate were sealed to obtain a sealed glass substrate. Thereafter, the presence or absence of a defective sealing point was visually observed. The results are shown in Table 1.

[Sealing material]

1) Sealing material A

Softening Point 80 ℃

2) Sealant B

Softening point 65 ℃

 Sealant A Melt viscosity 650 mPas Deep time 9 seconds × 4 sides Poor sealing point None of 4 sides  Sealant B Melt viscosity 350 mPas Deep time 6 seconds × 4 sides Poor sealing point None of 4 sides

In addition, temperature measurement was performed using the alcohol thermometer and the infrared radiation thermometer.

As apparent from the results shown in Table 1, when the sealing material A was used, the circumferential edge of the glass substrate could be sealed without a problem under conditions of a melt viscosity of 650 mPa · s and a dipping time of about 9 seconds. In addition, when the sealing material B was used, the circumferential edge of the glass substrate was able to be sealed without a problem on conditions of melt viscosity 350 mPa * s and dripping time about 6 second.

3. polishing process

The above-mentioned sealing and peeling glass substrate (gross thickness of glass: 0.7 mm x 2 = 1.4 mm) was set in a carrier and polished until the total thickness became 0.3 mm under the following conditions. Then, the state of the sealing material and the presence or absence of liquid invasion were visually confirmed. The results and the time required for polishing (polishing time) are shown in Table 2.

 Sealant A Polishing time 2 hours 53 minutes State of sealing material No change Liquid invasion None of 4 sides  Sealant B Polishing time 2 hours 53 minutes State of sealing material None of 4 sides Liquid invasion None of 4 sides

Under the polishing conditions of the experiment, the plate thickness was polished from 1.4 mm to 0.3 mm in total thickness over 2 hours and 53 minutes, but neither of the sealing material A and the sealing material B was used.

4. Comparative experiment of adhesive force of sealing material

In order to compare the adhesive force of UV curable resin and the sealing material of this invention, the experiment conditions and the experiment of the procedure shown below were performed. The results are shown in Table 3.

1) Experimental conditions

Glass substrate: 50 × 50 × 0.7 mmt

Sealant: (1) Sealant A

         (2) UV curable resin (traditional product)

Measuring instrument: push-pull scale

2) Experimental sequence

[Measurement of Adhesive Force of Sealing Material A]

a. 0.05 g of sealing materials A are put on a glass substrate, and it melts on a hotplate.

b. As shown in Fig. 3, a clip with a bottom area of about 0.9 cm 2 is placed on the melted sealant.

c. After returning to room temperature, it is left to stand for about 5 minutes to fully cure the sealing material.

d. Connect the push-pull scale to the clip's hook.

e. The glass substrate is fixed, pulled up manually, and the measured value at the time of peeling of a sealing material is confirmed. The same operation was repeated and the average was calculated.

[Measurement of Adhesion of UV Curable Resin]

 a. 0.05g of UV-curable resin is put on a glass substrate, and the clip of about 0.9 cm <2> of lower areas is put on the sealing material which melt | dissolved like FIG.

b. UV irradiation is performed for about 15 minutes to completely cure the sealing material.

c. Connect the push-pull scale to the clip's hook.

d. The glass substrate is fixed, pulled up manually, and the measured value at the time of peeling of a sealing material is confirmed. The same operation was repeated 5 times to find the average.

1st time 2nd 3rd Average Sealant A 71N 67N 72N 70N UV curable resin 5 measurements are 69 ± 11N 69N

The adhesive force at the time of using the sealing material A which is the hot-melt adhesive of this invention was about 70 N, almost equivalent to the adhesive force at the time of using the UV curable resin which is a conventional sealing material. Also about the sealing material B, although it is inferior to the sealing material A, the almost satisfactory result was obtained.

In addition, about the sealing material A, the dip temperature was changed and the melt viscosity was changed to about 500-800 mPa * s, and also about the sealing material B, the dip temperature was changed and the melt viscosity was changed to about 300-500 mPa * s, but the same experiment was performed. In all the above performances, the results were insignificant.

According to the present invention, it is possible to provide an improved method for producing FPD so that the sealing performance can be reliably exhibited only by using the minimum necessary sealing material.

Claims (10)

A sealing step of sealing a gap formed on the peripheral edge side of the laminated glass substrate formed by disposing a display element between two glass substrates by using a heat-dissolving sealing material; A flat panel display including a polishing step of polishing the outer surface of the laminated glass substrate with the gap sealed with the sealing material in contact with a chemical polishing liquid containing hydrofluoric acid, and thinning the laminated glass substrate to a predetermined thickness. Method of preparation. The method of manufacturing a flat panel display according to claim 1, wherein, prior to the sealing step, the sealing material is heated to 60 ° C or more to be melted. The method for manufacturing a flat panel display according to claim 1, wherein, before the polishing step, the sealant applied or stacked on the circumferential edge side is reheated so that its viscosity becomes 300 to 800 mPa · s. 2. The sealing step according to claim 1, wherein in the sealing step, the laminated glass substrate is immersed in the chemical polishing liquid, and the sealing material is discharged to a circumferential edge side surface of the upper side of the laminated glass substrate standing up or the process of injecting the sealing material into the gap. And a coating process is performed. The method of manufacturing a flat panel display according to claim 1, wherein the sealing material is discharged from the nozzle toward the gap in a dissolved state. The method of manufacturing a flat panel display according to claim 5, wherein the nozzle ejects the sealing material while moving in correspondence to a moving body which moves while maintaining a peripheral edge side surface of the laminated glass substrate. The method for manufacturing a flat panel display according to claim 1, wherein the sealing member is coated with the peripheral edge side surface of the laminated glass substrate held by a plate member incorporating a heater. The method of claim 1, wherein the sealing material comprises a paraffin-based material or a thermoplastic resin, has a melt viscosity of 650 mPa · s or less at a melt temperature of 180 ° C, and a melt viscosity of 300 mPa · s at a melt temperature of 80 ° C. The manufacturing method of the flat panel display which is the above. The method of claim 1, wherein the sealant is in a colored state at room temperature. The method of manufacturing a flat panel display according to claim 9, wherein the sealant is a colored adhesive containing a white pigment.

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