JP2000260304A - Flat panel display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat panel display in which a high vacuum airtightness can be invariably obtained by a low temperature process. SOLUTION: A flat panel display is provided with a front plate 6, a back plate 7 disposed in parallel thereto and a frame 4 placed therebetween. The frame 4 has a double construction which is formed of an outer frame 2 and an inner frame 1, and a metal portion 3 having a low melting point is provided therebetween. An inorganic adhesive 5 cured under low temperature adheres the frame 4 to the front plate 6 as well as to the back plate 7. The back plate 7 includes an electron source having an emission element and an electrode for controlling electrons emitted from the source. It is possible to obtain a high airtightness by filling residual pits in the inorganic adhesive for fastening the panel with the metal 3 having a low melting point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display and a flat panel display using a cold cathode electron source such as a field emission type or a surface conduction emission type.

[0002]

2. Description of the Related Art In recent years, flat panel displays (hereinafter referred to as FPDs) using liquid crystal, plasma, fluorescent display tubes, electroluminescence or cold cathode type electron-emitting devices have been developed from displays using CRT tubes. I have.

[0003] Since the FPD is small in depth and lightweight,
The demand is great. In particular, among information devices, display devices are becoming thinner and more sophisticated, and a display function is provided by arranging a large number of fine fluorescent lamps, electron-emitting devices, and ultraviolet-emitting devices on a flat plate following a liquid crystal display panel. FPDs have been developed.

Here, the liquid crystal display panel device does not emit light by itself, but displays characters and symbols using the role of a shutter. On the other hand, other FPD devices emit light by themselves and have a high brightness. It has high brightness and high contrast performance and is excellent in characteristics. In particular, in recent years, flat panel displays using cold cathode electron sources such as field emission type, surface conduction emission type, MIM type, etc. are self-luminous and use a phosphor equivalent to a CRT tube. Because of its wide viewing angle, its expectations are high.

In these flat panel displays, after forming a vacuum panel, baking is performed at a high temperature when removing gas inside the panel that adversely affects image display and life. Conventionally, as a material for fixing such a panel, for example, a low-melting glass has been used as described in JP-A-06-267424.

[0006]

When a flat panel display is formed using a low-melting glass, it is necessary to use a low-melting glass having a flowing temperature that can withstand baking at a high temperature. That is, when baking is performed at 300 to 400 ° C., a usable low-melting glass is required to have a deformation point, which is a thermal characteristic temperature, at least equal to or higher than the baking temperature. Therefore, the fixing temperature of the panel using the low melting point glass is 400 ° C. or higher.

[0007] As adhesives that can be fixed at a low temperature, there are also silicate-based and phosphate-based heat-resistant inorganic adhesives, and these adhesives can be fixed at a low temperature of about 200 ° C. Although it is excellent in heat resistance, since the adhered substance has pores remaining, essential airtightness cannot be obtained.

The present invention has been made in view of the above circumstances, and has as its object to provide a flat panel display that ensures high vacuum tightness by low-temperature processing.

[0009]

SUMMARY OF THE INVENTION A flat panel display according to the present invention comprises a front panel, a rear panel disposed parallel to the front panel, and a frame disposed between the front panel and the rear panel. Wherein the frame has a double structure of an outer frame and an inner frame, and has a low melting point metal portion between them.

The flat panel display according to the present invention is characterized in that the frame, the front plate and the rear plate are fixed with an inorganic low-temperature curing adhesive.

Also, in the flat panel display of the present invention, the rear plate has an electron source having an electron-emitting device;
And an electrode for controlling electrons emitted from the electron source.

According to the present invention, high airtightness can be obtained by filling the pores remaining in the inorganic adhesive for fixing the panel with a low melting point metal.

[0013]

Preferred embodiments of the present invention will be described below with reference to the drawings. The flat panel display of the present invention has a front plate, a rear plate arranged in parallel with the front plate, and a frame arranged between the front plate and the rear plate, as will be described later. It has a double structure of a frame and an inner frame.
A low melting point metal portion is provided between the outer frame and the inner frame, and the space between the frame, the front plate, and the rear plate is fixed with an inorganic low-temperature curing adhesive.

FIGS. 1 to 9 show steps of manufacturing a flat panel display according to the present invention. In FIG. 1, reference numeral 1 denotes an inner frame, and 2 denotes an outer frame. In this embodiment, glass having a thermal expansion coefficient substantially equal to that of a panel glass substrate forming a flat panel display is used.

As shown in FIG. 2, the inner frame 1 and the outer frame 2 are combined at predetermined positions, and a low melting point metal 3 is filled therebetween to form a composite frame 4 (FIG. 3). In this embodiment, indium having a melting point of 157 ° C. is used as the low melting point metal.

Next, as shown in FIG. 4, a heat-resistant inorganic adhesive 5 is applied to a portion where the composite frame 4 contacts the front plate and the rear plate.
Is applied. In this embodiment, a siloxane-based adhesive is used as the heat-resistant inorganic adhesive. After applying the heat-resistant inorganic adhesive 5, it is dried at 120 ° C. to form an adhesive-coated composite frame 4 ′.

FIG. 5 shows a cross section of the composite frames 4, 4 'and the like.

Next, a rear plate 7 having an electron source having an electron-emitting device and electrodes for controlling electrons emitted from the electron source, an adhesive-coated composite frame 4 ', and a front plate 6 having a phosphor Are aligned at predetermined positions so as to be sequentially stacked (FIGS. 6 and 7). And as shown in FIG.
The panel on which the alignment is completed is fixed by a fixing jig (not shown) to obtain an alignment panel 8.

Next, the assembled alignment panel 8 is placed under vacuum in a vacuum heating chamber (not shown).
The adhesive applied to the adhesive-coated composite frame 4 ′ is heated to 00 ° C. to make the adhesive flow. A load is applied in a direction perpendicular to the surface of the alignment panel 8 to set the panel at a predetermined position in the vertical direction. After the reaction of the inorganic adhesive 5 has sufficiently proceeded, the inside of the chamber is set to the atmosphere. Due to the pressure difference between the vacuum in the panel and the atmospheric pressure in the chamber, the molten indium fills the remaining pores of the solidified inorganic adhesive. Thereafter, the mixture was cooled to room temperature, and a flat panel display 9 having bonding strength and vacuum tightness was obtained (FIG. 9).

In this embodiment, a siloxane-based adhesive is used as the inorganic adhesive 5 and indium is used as the low-melting metal. However, other inorganic adhesives and low-melting metal may be used. It is.

[0021]

As described above, according to the present invention, the remaining pores of the inorganic adhesive are filled with the low melting point metal by fixing the space between the front plate and the rear plate with the inorganic low-temperature curing adhesive. And good airtightness can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration example of a double frame according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a combined state of double frames according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a combined state of a double frame and a composite frame made of a low melting point metal according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a combined state of a composite frame coated with an adhesive according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a composite frame according to an embodiment of the present invention.

FIG. 6 is a perspective view showing a combined state of panels according to the embodiment of the present invention.

FIG. 7 is a sectional view showing a combined state of panels according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view of an aligned panel according to an embodiment of the present invention.

FIG. 9 is a cross-sectional view of a flat panel display according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner frame 2 Outer frame 3 Low melting metal 4 Composite frame 4 'Adhesive coated composite frame 5 Heat resistant inorganic adhesive 6 Front plate 7 Rear plate 8 Alignment panel 9 Flat panel display

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H01J 29/86 H01J 29/86 Z 31/12 31/12 CF term (reference) 5C032 AA07 BB02 BB18 5C035 AA20 EE01 5C036 EE17 EF01 EF06 EF08 EG02 EG06 EH04 5C094 AA31 AA43 BA32 BA34 CA19 DA07 DA12 EC02 FA01 FB02 FB12 FB15 GB01 5G435 AA14 AA17 BB02 CC09 KK05

Claims (3)

[Claims] 1. A flat panel display having a front panel, a rear panel disposed parallel to the front panel, and a frame disposed between the front panel and the rear panel, wherein the frame includes an outer frame and an inner frame. A flat panel display comprising a double structure and having a low melting point metal portion between them. 2. The method according to claim 1, wherein the frame, the front plate and the rear plate are fixed with an inorganic low-temperature curing adhesive.
A flat panel display according to claim 1. 3. The flat panel display according to claim 1, wherein the rear panel has an electron source having an electron-emitting device, and an electrode for controlling electrons emitted from the electron source.