JPH06118430A - Production of flat panel display device - Google Patents

Abstract

PURPOSE:To obtain sufficient strength and reliability even in a temp. cycle test by fixing a base material of a flat panel display part and a flexible sub strate by using room temp. curing type (RTV) silicone at the timing of joining both. CONSTITUTION:The base material 1 of the flat panel display part and the flexible substrate 2 are adhered and cured by the RTV silicone 3. A leader electrode part 5 on the base material 1 of the flat panel display part is preferably exposed with a very small part of the electrodes without concealing the entire surface thereof by the flexible substrate 2 and after the RTV silicone is cured, this exposed part is wire drawn with solder, for example, cream solder 12. The leader electrode part 5 of the base material 1 of the flat panel display part and the flexible electrode substrate 4 are then fixed. This fixing is preferably executed by a local heating method, for example, by an IR line heater 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat panel display device. More specifically, the present invention relates to a method for joining an electrode portion of a flat panel display substrate and an electrode portion of a flexible substrate, which form a flat panel display device.

[0002]

2. Description of the Related Art A flat panel display device usually has a structure in which a flat panel display portion base material and a flexible substrate are laminated, and a signal is applied to electrodes arranged in a matrix on the surface of the base material. It is a device for displaying a target image. In order to display an image on this display device, it is necessary to use a device in which an independent driver output is connected to each electrode.

Conventionally, the lamination of the flexible substrate having the driver output and the flat panel display base material is mainly performed by soldering, and specifically, by a joining method such as a pulse heating method or a laser pulse method. Has been done. However, in this pulse heating method, since this method is a contact method, there is a problem that the flexible substrate is thermally contracted during bonding and the wiring on the base material surface is easily broken. Further, the laser pulse method has a defect that a wire breakage is likely to occur due to point bonding.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a flat panel display device, which overcomes the above problems of the prior art.

[0005]

As a result of examining various methods for laminating a flat panel display section base material and a flexible substrate, the present inventors have found that when joining the two,
The present invention has been found that fixing both with room temperature curable silicone (hereinafter referred to as RTV silicone) can suppress thermal expansion and contraction of the flexible substrate, and thus facilitates solder connection of each electrode portion. Has been completed.

Next, the present invention will be described in detail.

FIG. 1 is a cross-sectional view of a flat panel display device which is an embodiment of the present invention in which a flat panel display base material 1 and a flexible substrate 2 are adhered and cured with RTV silicone 3. FIG. 2 shows an embodiment for joining the flat panel display portion base material 1 and the flexible substrate 2 in the present invention.

The flat panel display substrate 1 is usually made of glass. As described above, the surface of these substrates is, for example, a nickel vapor deposition film or an extraction electrode solder-plated on the nickel vapor deposition film. There is a part 5. Among flat panel displays, electroluminescence (E
L) In the display device, the vertical and horizontal electrodes are drawn out from the display substrate 1.
Is formed. Therefore, the cover glass 7 is attached to protect the display unit from moisture and oxygen, and the outside air is shut off. In a liquid crystal display device and a plasma display device, either vertical or horizontal electrodes are formed on the cover glass 7 and face each other.

On the other hand, on the flexible substrate 2, normally,
A driver IC 6 and the like for display are mounted, and further, there is a flexible substrate electrode 4 which is plated with solder on a copper foil, for example. Therefore, first of all, the alignment is performed so that the two electrode portions are substantially matched with each other.

At this time, preferably, after fixing the aligned electrode portion with the adhesive tape 8 as shown in FIG.
As shown in FIG. 2, the RTV silicone 3 is drawn from the dispenser 11 to the end of the flat panel display portion base material 1 with a width of preferably 2 to 5 mm and cured to cure the flat panel display portion base material 1 and the flexible substrate. Join with 2.
At this time, 20 to 24 hours is sufficient for curing. In addition, in order to prevent displacement at the time of joining, while pressing the overlapping portion of the electrodes with an elastic body such as silicone rubber 9,
It is preferable to fix the flat panel display substrate 1 and the flexible substrate 2 with the pressing jig 10. The adhesive tape 8 is preferably a Kapton adhesive tape, and the adhesive tape 8 is removed after curing.

Further, when aligning the above-mentioned two electrode portions, the extraction electrode portion 5 on the flat panel display portion base material 1 is used.
It is preferable that the entire surface of the electrode is not hidden by the flexible substrate 2, but only a part of the electrode is exposed, and after the RTV silicone is cured, solder, for example, cream solder 12 is drawn on the exposed portion. At this time, the size of the exposed portion of the peripheral electrode is about 1 to 2 mm.

Then, as shown in FIG. 3, the lead electrode portion 5 of the flat panel display portion base material 1 and the flexible substrate electrode 4 are fixed by a local heating method such as an infrared line heater 13. It is preferable to carry out. Since this infrared line heater system is a non-contact, line heating system, it can be connected at a relatively low temperature and with little thermal distortion.

The heating is performed at a relatively low temperature (150-18
Pre-heating at 0 ° C, followed by main heating (220-250)
Two-stage heating of (. By using such a heating method, it is possible to suppress the influence of heat on the heating peripheral portion, and, for example, when a glass plate is used as the flat panel display portion base material 1, damage to the glass plate due to rapid heating is prevented. Can be prevented. The temperature and heating time are set according to the size of the glass substrate, the size of the flexible substrate,
Although it can be appropriately determined depending on the thickness, it is usually about 8 to 15 seconds for low temperature preheating and about 3 to 6 seconds for main heating.

[0014]

The display device obtained by the manufacturing method of the present invention has sufficient reliability even in the temperature cycle test.

[0015]

EXAMPLES The present invention will be described in more detail with reference to examples.

FIG. 1 is a sectional view of a flat panel display device obtained in an embodiment of the present invention. On the surface of the flat panel display substrate 1 made of glass, a lead-out electrode portion 5 solder-plated on a nickel vapor deposition film was formed. After aligning the lead-out electrode portion 5 of the flat panel display portion base material 1 with the flexible substrate electrode portion 4 of the solder-plated flexible substrate 2, the overlapping portion of the electrode portion is made of silicone rubber as shown in FIG. 9 is applied with pressure, and while this part is pressure-fixed with the pressure jig 10, the dispenser 11 applies RT to the end face of the flat panel display substrate 1.
The V-silicone 3 was drawn (width of about 2 mm) and left at room temperature for 24 hours.

After that, the pressing jig 10 is removed, turned over, and a sufficient amount of cream solder 12 for connection is drawn by a dispenser onto the extraction electrode portion 5 exposed by 1 mm or more from the tip of the flexible substrate. The infrared line heater 13 as shown in FIG. 3 melted and connected the solder.

This heating and melting was carried out by preheating from room temperature to 160 ° C. for about 10 seconds by an infrared line heater, and then performing main heating to 230 ° C. for about 4 seconds.

The flat panel display device obtained is +7.
It also had sufficient adhesive strength in terms of strength, such as satisfying a temperature cycle test of 20 at 5 ° C and -40 ° C.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a flat panel display device in which a glass panel and a flexible substrate are bonded and cured with RTV silicone.

FIG. 2 is a cross-sectional view showing an example of pressure fixation when drawing RTV silicone.

FIG. 3 is a cross-sectional view showing an example in which the cream solder is melted and the electrodes are connected by an infrared line heater after curing the RTV silicone.

[Explanation of symbols]

 1: Flat panel display substrate 2: Flexible substrate 3: RTV silicone 4: Flexible substrate electrode part 5: Extraction electrode part 6: Driver IC 7: Cover glass 8: Adhesive tape 9: Silicone rubber 10: Pressing jig 11 : Dispenser 12: Cream solder 13: Infrared line heater

[Procedure amendment]

[Submission date] July 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat panel display device. More specifically, the present invention relates to a method for joining an electrode portion of a flat panel display substrate and an electrode portion of a flexible substrate, which form a flat panel display device.

[0002]

2. Description of the Related Art A flat panel display device usually has a structure in which a flat panel display portion base material and a flexible substrate are laminated, and a signal is applied to electrodes arranged in a matrix on the surface of the base material. It is a device for displaying a target image. In order to display an image on this display device, it is necessary to use a device in which an independent driver output is connected to each electrode.

Conventionally, the lamination of the flexible substrate having the driver output and the flat panel display base material is mainly performed by soldering, and specifically, by a joining method such as a pulse heating method or a laser pulse method. Has been done. However, in this pulse heating method, since this method is a contact method, there is a problem that the flexible substrate is thermally contracted during bonding and the wiring on the base material surface is easily broken. Further, the laser pulse method has a defect that a wire breakage is likely to occur due to point bonding.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a flat panel display device, which overcomes the above problems of the prior art.

[0005]

As a result of examining various methods for laminating a flat panel display section base material and a flexible substrate, the present inventors have found that when joining the two,
The present invention has been found that fixing both with room temperature curable silicone (hereinafter referred to as RTV silicone) can suppress thermal expansion and contraction of the flexible substrate, and thus facilitates solder connection of each electrode portion. Has been completed.

Next, the present invention will be described in detail.

FIG. 1 is a cross-sectional view of a flat panel display device which is an embodiment of the present invention in which a flat panel display base material 1 and a flexible substrate 2 are adhered and cured with RTV silicone 3. FIG. 2 shows an embodiment for joining the flat panel display portion base material 1 and the flexible substrate 2 in the present invention.

The flat panel display substrate 1 is usually made of glass. As described above, the surface of these substrates is, for example, a nickel vapor deposition film or an extraction electrode solder-plated on the nickel vapor deposition film. There is a part 5. Among flat panel displays, electroluminescence (E
L) In the display device, the vertical and horizontal electrodes are drawn out from the display substrate 1.
Is formed. Therefore, the cover glass 7 is attached to protect the display unit from moisture and oxygen, and the outside air is shut off. In a liquid crystal display device and a plasma display device, either vertical or horizontal electrodes are formed on the cover glass 7 and face each other.

On the other hand, on the flexible substrate 2, normally,
A driver IC 6 and the like for display are mounted, and further, there is a flexible substrate electrode 4 which is plated with solder on a copper foil, for example. Therefore, first of all, the alignment is performed so that the two electrode portions are substantially matched with each other.

At this time, preferably, after fixing the aligned electrode portion with the adhesive tape 8 as shown in FIG.
As shown in FIG. 2, the RTV silicone 3 is drawn from the dispenser 11 to the end of the flat panel display portion base material 1 with a width of preferably 2 to 5 mm and cured to cure the flat panel display portion base material 1 and the flexible substrate. Join with 2.
At this time, 20 to 24 hours is sufficient for curing. In addition, in order to prevent displacement at the time of joining, while pressing the overlapping portion of the electrodes with an elastic body such as silicone rubber 9,
It is preferable to fix the flat panel display substrate 1 and the flexible substrate 2 with the pressing jig 10. The adhesive tape 8 is preferably a Kapton adhesive tape, and the adhesive tape 8 is removed after curing.

Further, when aligning the above-mentioned two electrode portions, the extraction electrode portion 5 on the flat panel display portion base material 1 is used.
It is preferable that the entire surface of the electrode is not hidden by the flexible substrate 2, but only a part of the electrode is exposed, and after the RTV silicone is cured, solder, for example, cream solder 12 is drawn on the exposed portion. At this time, the size of the exposed portion of the peripheral electrode is about 1 to 2 mm.

Then, as shown in FIG. 3, the lead electrode portion 5 of the flat panel display portion base material 1 and the flexible substrate electrode 4 are fixed by a local heating method such as an infrared line heater 13. It is preferable to carry out. Since this infrared line heater system is a non-contact, line heating system, it can be connected at a relatively low temperature and with little thermal distortion.

The heating is performed at a relatively low temperature (150-18
Pre-heating at 0 ° C, followed by main heating (220-250)
Two-stage heating of (. By using such a heating method, it is possible to suppress the influence of heat on the heating peripheral portion, and, for example, when a glass plate is used as the flat panel display portion base material 1, damage to the glass plate due to rapid heating is prevented. Can be prevented. The temperature and heating time are set according to the size of the glass substrate, the size of the flexible substrate,
Although it can be appropriately determined depending on the thickness, it is usually about 8 to 15 seconds for low temperature preheating and about 3 to 6 seconds for main heating.

[0014]

The display device obtained by the manufacturing method of the present invention has sufficient reliability even in the temperature cycle test.

[0015]

EXAMPLES The present invention will be described in more detail with reference to examples.

FIG. 1 is a sectional view of a flat panel display device obtained in an embodiment of the present invention. On the surface of the flat panel display substrate 1 made of glass, a lead-out electrode portion 5 solder-plated on a nickel vapor deposition film was formed. After aligning the lead-out electrode portion 5 of the flat panel display portion base material 1 with the flexible substrate electrode portion 4 of the solder-plated flexible substrate 2, the overlapping portion of the electrode portion is made of silicone rubber as shown in FIG. 9 is applied with pressure, and while this part is pressure-fixed with the pressure jig 10, the dispenser 11 applies RT to the end face of the flat panel display substrate 1.
The V-silicone 3 was drawn (width of about 2 mm) and left at room temperature for 24 hours.

After that, the pressing jig 10 is removed, turned over, and a sufficient amount of cream solder 12 for connection is drawn by a dispenser onto the extraction electrode portion 5 exposed by 1 mm or more from the tip of the flexible substrate. The infrared line heater 13 as shown in FIG. 3 melted and connected the solder.

This heating and melting was carried out by preheating from room temperature to 160 ° C. for about 10 seconds by an infrared line heater, and then performing main heating to 230 ° C. for about 4 seconds.

The flat panel display device obtained is +7.
It also had sufficient adhesive strength in terms of strength, such as satisfying a temperature cycle test of 20 at 5 ° C and -40 ° C.

Claims (1)

[Claims] 1. A flat panel display device in which a flat panel display base material and a flexible substrate are laminated, wherein the extraction electrode portion and the flexible board electrode portion of the flat panel display portion base material are adapted to be opposed to each other. ,
A method for manufacturing a flat panel display device, which comprises fixing an end face of a flat panel display part base material and a flexible substrate using room temperature curing type silicone, and then joining each electrode part.