JPH07130304A - Flat type image display device - Google Patents

Abstract

PURPOSE:To provide an image that has no unevenness or difference in display quality by connecting a spacer and a substrate, as well as a the spacer and a face plate in line-contact form, and whereby smoothing the pressure applied to the contact part at the time of connection so as to specify the distance between the substrate and the face plate. CONSTITUTION:A wiring electrode, and Ni electrodes 9, 10 are formed on a substrate 1 made of blue plate glass. The interval between the respective electrodes is 3mum, and a solution containing organic Pd is applied on the electrodes 9, 10, which are heated to form a thin film 7 consisting of very small PdO grains, and an electron emitting element part 5 consisting of a plurality of electron emitting elements 11 is formed. A metal back 13 consisting of phosphor 6 and Al is formed on a face plate 2 made of blue plate glass, An ethyl cellulose solution is applied to a spacer 3 made of glass. The substrate 1, the spacer 3 and the face plate 2 are formed and arranged on specific points, and are baked under pressurized condition to form a flat type image device. Evacuation is carried out through exhaust hole provided on the spacer 3 and a display device is thus provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat image display device having an airtight structure.

[0002]

2. Description of the Related Art Conventionally, as a flat image display device, there are a display device using an electron-emitting device, a plasma display device and the like. Two types of electron-emitting devices are known, one using a thermoelectron source and the other using a cold cathode electron source. Cold cathode electron sources include field emission type (FE type), metal / insulating layer / metal (MIM type) and surface conduction type (SCE).

In a display device using an electron-emitting device, electrons emitted from a plurality of electron-emitting devices provided on a substrate are applied to a phosphor on a face plate arranged to face the substrate. The phosphor emits light and an image is formed. Further, in the plasma display device, a gas discharge is used, and the phosphor on the face plate emits light by irradiation of ultraviolet rays due to the gas discharge to form an image. The substrate and the face plate are arranged at a predetermined interval and are hermetically sealed at the outer peripheral portion to form a high vacuum state necessary for electron emission or a predetermined gas atmosphere state.

Here, a conventional method for hermetically sealing a flat panel image display device will be described with reference to FIGS. 8 and 9 (the internal structure is omitted).

As shown in FIG. 8, a bonding material 4 such as low melting point glass is applied to the bonding surfaces of the substrate 1 and the face plate 2 and dried, and then the substrate 1 and the face plate 2 are bonded.
Is kept at a predetermined thickness, the spacer 3 constituting the outer peripheral portion is sandwiched in the center and fixed from above and below, and the bonding agent 4 is heated to a temperature at which it softens while applying a load, and then cooled. FIG. 9 shows a cross-sectional view of the flat panel image display device which has completed the hermetic sealing process. The substrate 1 and the spacer 3 and the face plate 2 and the spacer 3 are adhered to each other by a bonding agent 4 to form an airtight structure.

[0006]

However, in the above-mentioned conventional method, there is a bonding agent layer such as low melting point glass fused between the substrate and the spacer and between the face plate and the spacer. Since the thickness of the bonding agent layer changes depending on various conditions such as the composition, heating temperature, bonding surface area, etc., it is difficult to maintain the gap between the substrate and face plate with high precision, and a flat surface with good performance is obtained. The mold image display device could not be obtained.

[0007]

The present invention has been made to solve the above-mentioned problems of the conventional method. That is, according to the present invention, in a flat panel image display device in which a substrate and a face plate arranged to face the substrate are hermetically sealed at the outer peripheral portion via a spacer, the spacer and the substrate, and the spacer and the face. Provided is a flat image display device, characterized in that the plate and the plate are both joined by line contact.

Conventionally, the spacer, the substrate, and the face plate have been in surface contact with each other via a bonding agent layer such as low-melting-point glass, but in the present invention, the contact is a line contact. The pressure at the time is evenly applied to the joint portion, and it becomes possible to keep the distance between the substrate and the face plate constant. Further, since the spacer is in line contact with the substrate and the face plate, pressure is concentrated on the contact portion at the time of joining, and the bonding agent on the contact portion is extruded to the surroundings, and the thickness of the spacer substantially causes the contact with the substrate. The distance from the face plate can be maintained with high accuracy.

[0009]

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

(Embodiment 1) FIG. 1 is a schematic view showing an example of a flat image display device of the present invention, and FIG. 2 is a line A- of FIG.
It is sectional drawing in the A'line.

In these figures, 1 is a substrate, 2 is a face plate, 3 is a spacer, 4 is a bonding agent, and an electron-emitting device portion 5 composed of a plurality of electron-emitting devices 11 is provided on the substrate 1.
Are formed.

FIG. 3 is a diagram showing the structure of the electron-emitting device 11, in which 7 is a thin film made of an electron-emitting material, 8 is an electron-emitting portion, and 9 and 10 are electrodes. This device utilizes a phenomenon in which a small area thin film formed on a substrate causes electron emission by causing a current to flow in parallel in the film, and is generally called a surface conduction electron-emitting device. There is.
By applying a voltage to the electrodes 9 and 10, electrons are emitted from the electron emitting portion 8, and the emitted electrons hit the phosphor 6 provided on the face plate 2 to cause the phosphor 6 to emit light.

Substrate 1 on which this electron-emitting device section 5 is formed
The face plate 2 and the face plate 2 are kept at a predetermined distance by a spacer 3 to form an airtight structure. The cross-sectional shape of the spacer 3 is circular as shown in FIG. 2, and the spacer 3 is in contact with the substrate 1 and the face plate 2 at one point on the circumference. It is joined.

The method of making the flat image forming apparatus of this embodiment will be described below.

1-3, soda lime glass is used for the substrate 1, and wiring electrodes (not shown) and Ni electrodes 9 and 10 are formed on the substrate 1 by using a vacuum film forming technique and a photolithography technique or a precision printing technique. To form. At this time, the distance between the Ni electrodes was 3 μm, and the thickness of the electrodes was 1000 Å. Next, after applying a solution containing organic palladium (manufactured by Okuno Chemical Industries Co., Ltd., ccp-4230) on the electrodes 9 and 10, heat treatment was performed at 300 ° C. for 10 minutes to obtain a thickness of 70Å.
The thin film 7 made of fine particles of palladium oxide (PdO) was formed, and the electron-emitting device portion 5 made of a plurality of electron-emitting devices 11 was formed.

A soda lime glass was used for the face plate 2, and a phosphor 6 and a metal back 13 made of aluminum were formed on the face plate 2.

Glass is used for the spacer 3, cut into a predetermined shape, and after polishing, a low melting point glass as a bonding agent 4 (LS-3081, manufactured by Nippon Electric Glass Co., Ltd.) is used at the bonding portion.
And a solution obtained by dissolving ethyl cellulose in a solvent were applied.

Next, the substrate 1, the spacer 3 and the face plate 2 are laminated at a predetermined position, pressurized with a 1 kg weight, and fired in the atmosphere at a heat treatment temperature of 410 ° C. for a heat treatment time of 1 hour. A flat image display device was formed.

In the present invention, the material of the spacer 3 is not particularly limited, but it is desirable that the spacer 3 is excellent in strength and airtightness and has the same coefficient of thermal expansion as the substrate 1 and the face plate 2. Moreover, the bonding agent 4 may be applied to the substrate 1 and the face plate 2 sides.

In the present invention, the phosphor 6 may be a single color or a combination of a plurality of colors. For example,
The three colors of red, blue, and green arranged in stripes or mosaics are used.

In the flat panel image display device produced as described above, the distance between the substrate 1 and the face plate 2 can be made constant. Further, when vacuum exhaust was performed to about 1 × 10 ⁻⁶ Torr from the exhaust hole 12 provided in the spacer 3, a flat image display device without leak could be obtained. Further, a voltage of 5 V was applied to the created electron-emitting device 11 to carry out energization processing to form the electron-emitting portion 8, and then the flat-panel image display device was driven.
Since the distance between the face plate 2 and the face plate 2 is kept constant, it is possible to obtain a uniform light emission spot on the face plate 2 and to produce a flat image display device having no display unevenness and excellent performance. I was able to.

(Embodiment 2) Next, another example of the flat image display device of the present invention will be described.

FIG. 4 is a block diagram showing another example of the flat image display device of the present invention. In the figure, 1 is a substrate, 2 is a face plate, 3 is a spacer, 4 is a bonding agent, 6 is a phosphor,
Reference numerals 14 and 15 are electrodes, and 16 is a gas filled space.

The flat image display device in this case is a display device utilizing gas discharge, and is generally called a plasma display device. Electrodes 14 and 15 are formed on the substrate 1 and face plate 2 so as to face each other, and a space 16 between them is filled with a predetermined gas. Electrode 14
By applying a voltage to 15 and 15, a gas discharge occurs, and the phosphor 6 is excited and emits light by the ultraviolet irradiation by the gas discharge.

The method of producing the flat image display device of this embodiment will be described below.

A soda-lime glass is used for the substrate 1 and the face plate 2, and by vacuum film forming technology and photolithography technology,
The electrodes 14 and 15 made of ITO were formed.

Glass is used for the spacer 3 and processed to have an elliptical cross section as shown in FIG. 4, and then a low melting point glass (Nippon Electric Glass Co., Ltd.) is used as the bonding agent 4 at the bonding portion.
Manufactured by LS-3081) and ethyl cellulose were dissolved in a solvent to obtain a solution.

Next, the substrate 1, the spacer 3 and the face plate 2 are laminated at a predetermined position, pressurized with a weight of 1.5 kg, and heat-treated at a temperature of 410 ° C. for 1 hour in the atmosphere. After baking, a mixed gas of Xe-He was sealed through a gas sealing hole (not shown) to prepare a flat image forming apparatus.

In the flat-panel image display device thus produced, the space between the substrate 1 and the face plate 2 could be formed constant. Also, there was no leak of the enclosed gas. Furthermore, when the present flat panel image display device is driven, a constant discharge characteristic is obtained because the gap between the substrate 1 and the face plate 2 is kept constant, and there is no unevenness in light emission and a flat surface with excellent performance. The mold image display device could be created.

In the present invention, the shape of the spacer 3 is not limited to the shape shown in the first and second embodiments, but it contacts at least the substrate 1 and the face plate 2 as shown in FIGS. 5 and 6. The cross section of the part may have an arc shape, and as shown in FIG. 7, the cross section of the spacer may have a polygonal shape.

[0031]

As described above, in the flat image display device in which the substrate and the face plate are hermetically sealed at the outer peripheral portion via the spacer, the spacer and the substrate are
By joining the spacer and the face plate in line contact with each other, the pressure is evenly applied at the time of joining, so that the gap between the substrate and the face plate can be made constant, and there is no display unevenness or variation. A high-performance flat image display device can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a flat-panel image display device of the present invention.

FIG. 2 is a cross-sectional view taken along the line A-A ′ in FIG.

FIG. 3 is a schematic perspective view showing the configuration of an example of an electron-emitting device.

FIG. 4 is a schematic cross-sectional view of another example of the flat image display device of the present invention.

FIG. 5 is a schematic cross-sectional view of still another example of the flat image display device of the present invention.

FIG. 6 is a schematic cross-sectional view of still another example of the flat image display device of the present invention.

FIG. 7 is a schematic cross-sectional view of still another example of the flat image display device of the present invention.

FIG. 8 is a configuration diagram showing an example of a conventional planar image display device.

FIG. 9 is a cross-sectional view of an example of a conventional flat-panel image display device.

[Explanation of symbols]

 1 Substrate 2 Face Plate 3 Spacer 4 Bonding Agent 5 Electron Emitting Element Section 6 Fluorescent Material 7 Thin Film Made of Electron Emitting Material 8 Electron Emitting Section 9, 10, 14, 15 Electrode 11 Electron Emitting Element 12 Exhaust Hole 13 Metal Back 16 Gas Filling space

Claims (3)

[Claims] 1. A flat-panel image display device comprising a substrate and a face plate arranged to face the substrate, which are hermetically sealed at an outer peripheral portion thereof via a spacer, the spacer and the substrate, and the spacer and the face. The plate is
A flat image display device characterized in that both are joined by line contact. 2. The flat image display device according to claim 1, wherein the upper and lower end portions of the spacer have an arc-shaped cross section, and the spacer and the substrate and the spacer and the face plate are joined on the arc. 3. The flat image display device according to claim 1, wherein the thermal expansion coefficient of the spacer is substantially equal to the thermal expansion coefficients of the substrate and the face plate.