JP2654570B2 - Flat display device and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flat display device using an electron beam and a method for manufacturing the same.

[Prior Art] Conventionally, liquid crystal display devices, EL display devices, and plasma display panels have been put into practical use as flat display devices, but they are insufficient for image display due to viewing angle, colorization, brightness, and the like. Level. In particular, the difference in display performance is large as compared with a cathode ray tube (CRT), and the situation has not reached a situation where a cathode ray tube can be substituted.

On the other hand, with the advancement of information processing by computers and the enhancement of image quality of television broadcasts, the need for high-definition, large-screen flat display devices is rapidly increasing.

For this reason, several electron beam acceleration type flat display devices for displaying images have been proposed. For example, U.S. Pat.No. 3,408,532,3935499 and JP-A-56-28445.
As shown in Japanese Patent Application Laid-Open Publication No. H10-260, a planar electron source is provided, an electron beam is extracted from the electron source, and controlled and accelerated by a control electrode group provided with a large number of holes corresponding to phosphor pixels.
Irradiation is performed on a flat phosphor screen to emit a desired phosphor pixel.

Conventionally, in such a flat display device, a substrate provided with a plurality of electron sources and a substrate having a phosphor screen are laminated with a plate-like panel such as a spacer interposed therebetween, and when a vacuum container is formed, the substrate is not crushed by atmospheric pressure. It had a structure like that.

[Problems to be Solved by the Invention] However, in the above-described conventional flat display device, since the spacer is heat-welded to the substrate with low-melting glass, it depends on conditions such as the temperature at the time of welding and the applied pressure. The thickness of the low-melting glass between the substrate and the spacer varies, and assembling with high accuracy, that is, assembling in a state where the gap between the substrates is adjusted at an accurate angle has been performed. As described above, when variations occur in the substrate, the distance between the electron source and the phosphor screen changes, and there is a problem that display is uneven.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a flat display device capable of assembling with high accuracy with a simple structure and a method of manufacturing the same.

[MEANS FOR SOLVING THE PROBLEMS] An object of the present invention is to provide a first substrate on which a plurality of electron emitting portions for generating an electron beam are formed, and a fluorescent light on which a phosphor pixel which emits light by collision of the electron beam is formed. A second substrate having a surface, and a spacer disposed between the first and second substrates and formed of a plate-like member having a through hole, wherein the spacer is a vacuum container together with the first and second substrates. And a partition wall for supporting the atmospheric pressure inside the vacuum vessel, and formed by heating and welding the first and second substrates and the outer frame portion of the spacer with low-melting glass. In the flat display device, the inner surfaces of the first and second substrates are made of a material that does not soften even at the melting temperature of the low-melting glass, and are disposed discretely with respect to the partition walls of the spacer, and the spacer of This is achieved by providing a protrusion that directly contacts the partition.

Here, it is preferable that the protrusion is formed by printing. When the projection is formed by printing, the height of the projection is desirably in the range of 0.05 to 0.2 mm in order to maintain the uniformity of the shape. As a material for the protrusion, for example, a paste containing a crystallization type frit as a main component can be suitably used.

In the present invention, the electron emission section is configured using, for example, a surface conduction electron emission element.

Further, the object of the present invention is to provide a first substrate having a plurality of electron emitting portions for generating an electron beam and a second substrate having a phosphor screen having phosphor pixels which emit light by collision of the electron beam. And a spacer formed of a plate-like member having a through-hole and comprising a vacuum vessel together with the first and second substrates, and a partition for supporting atmospheric pressure inside the vacuum vessel. A method for manufacturing a flat display device by heating and welding the first and second substrates and an outer frame portion of the spacer with low-melting glass, wherein the inner surfaces of the first and second substrates are Protrusions made of a material that does not soften even at the melting temperature of the low-melting glass are discretely formed in advance on the partition walls of the spacer by printing, and thereafter, the protrusions are so formed as to directly contact the partition walls of the spacers. It is achieved by heat welding an outer frame portion of the first and second substrate and the spacer.

[Function] In the present invention, only the outer frame portion of the spacer is heat-welded with the substrate and low-melting glass, and no adhesive such as low-melting glass is provided between the partition wall of the spacer and the substrate. Variations in the gap between the substrates due to unevenness do not occur.

Further, in the present invention, the projections are provided discretely on the inner surface of the substrate with respect to the partition walls of the spacer. This is to reduce the contact area of the partition wall of the spacer. Substrates usually have surface shape variations such as undulations and warpage. It is difficult to assemble the substrate such that the surface of the substrate is completely aligned with the surface of the partition wall of the spacer, no matter how much pressure is applied during assembly, and a gap is generated between the partition wall of the spacer and the substrate. In addition, since the surface shape of the substrate varies from one piece to another, the gap does not always occur at a fixed position. In this way, due to the occurrence of a gap that cannot be predicted in advance, the atmospheric pressure support structure is not configured as designed, and extra force that is not originally applied is applied around the gap, causing deformation such as distortion, and in the worst case, It is also conceivable that the substrate cannot support the atmospheric pressure, and the substrate and the partition walls of the spacer are damaged.

According to the present invention, the projections are provided on the substrate discretely with respect to the partition walls, so that the partition walls of the spacer are completely adhered, that is, the partition walls of the spacer and the projections are securely brought into contact with each other. Such unexpected gaps are prevented from occurring.

In addition, since the protrusions of the present invention are formed from a material that does not soften even at the melting temperature of the low-melting glass, they do not deform when the outer frame portion of the spacer and the substrate are welded by heating, and the space between the substrates does not change. The gap can be kept constant and highly accurate assembly can be performed.

Embodiment Next, an embodiment of the flat display device of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of the flat display device of the present invention. Reference numeral 1 denotes a substrate made of a glass plate or the like, on which electron-emitting portions 2 are arranged in a planar manner corresponding to the pixels. A surface conduction electron-emitting device is used for the electron-emitting portion 2 of this embodiment. This device utilizes the phenomenon that electron emission occurs when a current flows through a small area thin film formed on a substrate.
n) and others using a SnO ₂ (Sb) thin film have been reported [Radio Eng. Electron. Phys., Vol. 10, 1290.
1296, 1965]. Au is used as the electron-emitting device.
Thin films, ITO thin films and carbon thin films have also been reported, and relatively high electron emission efficiency has been obtained.

Since these surface conduction electron-emitting devices have a simple structure,
A large number of elements can be arranged in a plane, and there is an advantage that there is no need to worry about heat generation because of the cold cathode.

The electron emission portion 2 on the substrate 1 is composed of a surface conduction type thin film element capable of emitting electrons such as Au, ITO, carbon, etc., and is composed of an electrode 3 composed of a conductive film such as a thick silver paste or an aluminum thin film.
4, they are connected in a line shape in the X direction in the figure. Here, the electrode 4 is common to the ground line.

An exhaust hole 6 is provided on the substrate 1, and an exhaust pipe 7 is welded with low melting point glass.

A spacer 8 made of an insulating material such as photosensitive glass is provided on the substrate 1, and a groove-like through hole 9 for ventilation and a groove-like through hole 10 through which an electron beam from the electron emission unit 2 passes are provided. ing. That is, the spacer 8 is formed by integrally forming the outer frame portion and the partition wall between the through holes.

Next, there is an electrode substrate 11, which is made of an insulating material such as photosensitive glass, and provided with ventilation holes 12 and small holes 13 through which electron beams pass at positions corresponding to each pixel. On the substrate 1 side of the electrode substrate 11, a control electrode 14 made of a metal film of Ni, Al, Cr-Cu-Cr or the like is provided in parallel along the Y direction in the figure. Acceleration electrode made of metal film such as Al, Cr-Cu-Cr
15 is provided commonly to all pixels.

Further, a spacer 16 made of an insulating material such as photosensitive glass is provided thereon, and a groove-shaped through hole 17 for ventilation and a groove-shaped through hole 18 through which an electron beam passes are provided. That is, the spacer 16 is formed by integrally forming the outer frame portion and the partition wall between the through holes.

Finally, there is a face plate 19 made of a glass plate, and a phosphor 20 is formed in a line in the Y direction on the surface on the substrate 1 side, and a metal back layer is formed on the phosphor surface as shown in the sectional view of FIG. 21 is formed by Al evaporation.

Next, the operation of the flat display having the above configuration will be described.

In the cross-sectional view of FIG. 2, when a voltage is applied to the electrodes 3 and 4, electrons are emitted from the electron emitting portion 2, and the control electrode
When a voltage is applied to 14, electrons are extracted to the small holes 13, are accelerated by the acceleration electrode 15, are further accelerated by the metal back layer 21 to which a high voltage is applied, and collide with the phosphor 20 to emit light. At that time, the modulation of the electron beam can be controlled by changing the voltage applied to the control electrode 14.

In FIG. 1, the electron-emitting portions 2 arranged in a line in the X direction are sequentially scanned line by line, and the control electrodes arranged in a line in the Y direction.
A desired image can be displayed by sequentially scanning 14 based on the modulation signal.

The above-described substrate 1, spacer 8, electrode substrate 11, spacer 16, and sealing portion 5 on the outer periphery of the face plate 19 are fired and sealed with low-melting glass or the like to form a vacuum envelope. The flat display is formed by evacuating and sealing with a burner or the like.

At this time, the exhaust hole 6 is connected to the ventilation groove-shaped through hole 9 of the spacer 8 and further to the ventilation groove 12 of the electrode substrate 11 extending in the Y direction. The ventilation groove 12 overlaps the ventilation groove-shaped through hole 17 of the spacer 16 and the groove-shaped through hole 18 through which the electron beam passes, and further overlaps the groove-like through hole 10 of the spacer 8 through which the electron beam passes. Therefore, all the spaces in the flat display can communicate with each other and can be exhausted.

At this time, the substrate 1, face plate 19
Atmospheric pressure is applied to both sides of the substrate, but the structure is such that the insulating spacers 8 and 16 support the atmospheric pressure by the partition walls of the groove-shaped through holes through which the electron beams pass.

Therefore, the face plate 19, the partition wall of the insulating spacer 16, the electrode substrate 11, the partition wall of the insulating spacer 8, and the bonding surfaces of the respective plate-like panels of the substrate 1 are assembled in close contact, that is, contact is ensured. You need to be able to support it.

Therefore, as shown in FIG. 3, the thickness of the bonding surface of the electrode substrate 11 bonded to the partition wall of the insulating spacer 16 is about 0.05 to 0.2 m by thick film printing.
The m-shaped projections 42 are provided, and at the time of sealing assembly, each partition of the insulating spacer 16 is closely attached to the projection 24 to be assembled. In addition, as shown in FIG. 4, the row-shaped projections 24 are similarly provided on the other face plates 19 and the joining surfaces of the insulating spacers 16 and 8 of the substrate 1 with the partition walls so that they can be closely assembled. I have. At the time of sealing assembly, each plate-like panel is positioned by an assembling jig, pressurized to bring the bonding surfaces into close contact, and heated and welded by the low-melting glass 22 of the sealing portion 5 corresponding to the outer frame portion.

At this time, it is desirable to use a paste containing a crystallization type frit as a main component so that the projections 24 provided on each joint surface do not soften even at the melting temperature of the low-melting glass. Further, the projections 24 need not necessarily be arranged in a row, and the same effect can be obtained even if they are provided in a lattice or a dot.

[Effects of the Invention] As described above, the protrusions that are made of a material that does not soften even at the melting temperature of the low-melting glass on the inner surface of the substrate, are discretely arranged on the partition walls of the spacer, and directly contact the partition walls of the spacer Since the projections are provided, even when the substrate is sealed using low-melting glass, the projections are not deformed, and the projections and the partition walls of the spacer are in close contact with each other, that is, the gap between the substrates is securely contacted. It is possible to assemble with high precision so as to make it constant and to manufacture a highly reliable flat display device that can withstand atmospheric pressure.

[Brief description of the drawings]

1 is an exploded perspective view of the present invention, FIG. 2 is a sectional view of the present invention, FIG. 3 is an explanatory view of the present invention, and FIG. 4 is a sectional view of the present invention. DESCRIPTION OF SYMBOLS 1 ... board | substrate 2, ... electron emission part 8,16 ... spacer, 11 ... electrode board 12 ... ventilation groove, 13 ... control electrode 19 ... face plate, 20 ... phosphor 22 ... low Melting glass, 24 ... Projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Kakimoto 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Hidetoshi Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Ichiro Nomura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-61-133539 (JP, A) JP-A-62-296334 (JP) , A) Japanese Utility Model Showa 60-187448 (JP, U)

Claims (7)

(57) [Claims] A first substrate having a plurality of electron-emitting portions for generating an electron beam; a second substrate having a phosphor screen having phosphor pixels which emit light by collision of the electron beam; An outer frame portion, which is disposed between the first and second substrates and is formed of a plate-like member having a through hole and which forms a vacuum container together with the first and second substrates; A flat panel display device having a partition wall for supporting atmospheric pressure on the inside, and formed by heat-welding the first and second substrates and an outer frame portion of the spacer with low-melting glass; And, on the inner surface of the second substrate, a projection made of a material that does not soften even at the melting temperature of the low-melting glass, is disposed discretely with respect to the partition wall of the spacer, and directly contacts the partition wall of the spacer. thing A flat display device characterized by the above-mentioned. 2. The flat display device according to claim 1, wherein the projection is formed by printing. 3. The flat display device according to claim 2, wherein the projection has a height of 0.05 to 0.2 mm. 4. The flat panel display device according to claim 2, wherein the projections are formed using a paste containing a crystallization type frit as a main component. 5. The flat display device according to claim 1, wherein the projections are formed in a row, a grid, or a dot. 6. The flat display device according to claim 1, wherein said electron-emitting portion is constituted by using a surface conduction electron-emitting device. 7. A first substrate having a plurality of electron emitting portions for generating an electron beam, and a second substrate having a phosphor screen having phosphor pixels which emit light by collision of the electron beam are penetrated. The first and second members are made of a plate-like member having holes.
An outer frame part that forms a vacuum container together with the substrate, and a spacer having a partition wall that supports the atmospheric pressure inside the vacuum container are interposed therebetween, and the first and second substrates and the outer frame part of the spacer are disposed. In a method of manufacturing a flat display device by heat welding with low melting point glass, a projection made of a material that does not soften even at the melting temperature of the low melting point glass is printed in advance on the inner surfaces of the first and second substrates. Is formed discretely with respect to the partition walls of the spacer,
Thereafter, the first and second substrates and the outer frame portion of the spacer are heated and welded so that the protrusions and the partition walls of the spacer come into direct contact with each other.