JP2001143619A - Method for forming rib structure and method for manufacturing flat display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the end portions of a rib structure from being bent. SOLUTION: A shape of side face of end portion of multiple-layered rib 10 is made as stair step-wise composed of plural steps, arranged with the upper steps positioning inner side than the lower one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a rib structure comprising a plurality of plate-like ribs having a height higher than a thickness, and a method in which a plurality of ribs are formed at predetermined intervals on an inner surface of an envelope. The present invention relates to a method of manufacturing a flat display in which a light emitting portion is formed in a region sandwiched between cage ribs.

[0002]

2. Description of the Related Art FIG. 7 is a process chart for explaining a conventional method for forming a rib structure. In this figure, the side surface of the rib is shown. First, as shown in FIG. 7A, a rib 101 is formed in a rib forming region on a glass substrate 111 by using a screen printing method. At this time, as the printing paste, one obtained by mixing a resin mainly with a low melting point glass material and dissolving it in a solvent is used. Next, as shown in FIG. 7B, the ribs 101 are fired to form the ribs 112.

The rib structure thus formed is used for, for example, an FED (Field Emissin Display). This FED is a flat panel display that emits light by colliding electrons emitted from electron sources arranged in a two-dimensional matrix with a light emitting portion formed of a phosphor formed on a counter electrode. FIG. 8 is a perspective view showing a partial configuration of an FED having a rib structure.

[0004] In the FED shown in FIG.
Are formed on the cathode-side glass substrate 121 at predetermined intervals. The dimensions of the rib 122 are about 50 μm in thickness and about 100 μm in height. In a region on the cathode-side glass substrate 121 sandwiched between the ribs 122, an electron emission portion 123 as a cathode is formed in a stripe shape.
On the rib 122, an electron extraction electrode 124 having a large number of openings 124a is arranged. The electrode lead-out electrode 124 is divided into stripes in a direction orthogonal to the electron emission section 123. The region where the electron emission portion 123 and the electron extraction electrode 124 intersect is
This constitutes one display dot.

Further, a plurality of ribs 126 are arranged orthogonally on the rib 122. These ribs 126 are arranged in a boundary region between the electron extraction electrodes 124 divided into stripes. The size of the rib 126 is 30 μm in thickness.
And the height is about 100 μm. Then, the rib 126
An anode-side glass substrate 125 is disposed thereon. The anode side glass substrate 125 and the cathode side glass substrate 121 constitute a vacuum container. In addition, the anode side glass substrate 1
A transparent electrode 128 as an anode and a light emitting unit 127 made of a phosphor are formed on the inner surface of the light emitting device 25.

In such a configuration, the electron emitting portion 12
When a potential of about −several tens of volts is applied to 3 and a potential of about + several tens of volts is applied to the electron extracting electrode 124, electrons are emitted from the intersection region between the electron emitting portion 123 and the electron extracting electrode 124. At this time, if a potential of about + several tens of volts is applied to the transparent electrode 128, the emitted electrons reach the light-emitting portion 127 in a portion facing the above-described crossing region. Light.

[0007]

As described above, FIG.
In the conventional FED shown in (1), ribs having a height of about 100 μm are used as the ribs 122 and 126. Therefore, the distance between the electron emitting portion 123 as a cathode and the transparent electrode 128 as an anode is approximately 200 μm. However, this interval is not sufficient for the traveling distance of the electrons emitted from the electron emitting portion 123, and the trajectory of the electrons cannot be made uniform. For this reason, there is a problem that luminance unevenness occurs in each display dot, so that the light emission display of the entire FED has a rough impression. Also, FED
When applying a high voltage of about several kV between the cathode and the anode in order to increase the brightness of the device, there is a problem that the discharge occurs because the gap between the cathode and the anode is narrow.

In order to solve these problems, a rib 1 for keeping a space between the electron extraction electrode 124 and the transparent electrode 128 is required.
As 26, the use of ribs that are taller than in the past was considered. However, when a rib having a height of about 450 μm (about 100 μm in thickness) is formed by using the above-described conventional rib structure forming method, the rib 112a shown in FIG.
As described above, both ends in the longitudinal direction of the rib 112a are warped upward. FIG. 10 is a schematic diagram for explaining the principle that both ends of the rib 112a shown in FIG. 9 warp upward.
This figure shows the left end X of the rib 101 shown in FIG.
The side view is shown.

When the rib 101 is fired, the components other than the glass material in the printing paste evaporate, so that the volume of the rib 101 shrinks. For this reason, the end face 13 of the rib 101
1 is drawn to the center, so that the end face 1 of the rib 101
A tension 132 is applied to 31 toward the center. The tension 132 is generated almost uniformly on the entire end face 131. On the other hand, the moment of the force is expressed by equation (1). Moment of force = force × arm length (1) Since the bottom face 133 of the end face of the rib 101 is fixed to the glass substrate 111, if the end face 131 of the rib 101 is used as the arm of the moment, it acts on the end face 131. It can be seen from equation (1) that the moment of the force increases as the distance from the end face bottom 133 increases.

When the height of the rib 101 is sufficiently high, the end face 13 is initially actuated by a moment based on the tension 132 at the start of firing.
1 is inclined, but when this moment exceeds the adhesive force at the end face bottom 133, the end face bottom 13
3 comes off the glass substrate 111. After that, the end face 1
Since the tension 132 continues to be applied to 31, the end of the rib 101 warps upward, and the side shape of the completed rib 112 a becomes as shown in FIG. 9.

When the both ends of the rib 112a warp upward in this manner, the height of the upper surface of the rib 112a becomes uneven. When such a rib 112a is used for the rib 126 of the FED shown in FIG. 8, the distance between the cathode and the electron extraction electrode and the anode is not constant. For this reason, there is a problem that electrons reaching the light emitting section 127 vary, and uniform light emission cannot be obtained between the display dots. Further, if both ends of the rib 112a are warped upward, there is a problem that the bonding strength between the rib 112a and the glass substrate 111 at the both ends is weakened.

The present invention has been made in order to solve such a problem, and an object of the present invention is to suppress warpage of an end of a plate-like rib having a height higher than a thickness. Also,
Another object is to increase the brightness without compromising the uniform light emission of the flat panel display.

[0013]

In order to achieve the above object, a method of forming a rib structure according to the present invention comprises forming a multilayer rib by applying an insulating paste in a multilayered manner on a rib forming region on a substrate. And a second step of firing the formed multi-layer ribs. In the first step,
The multilayer rib is formed such that the side surface shape of the end portion of the multilayer rib is a stepped shape including a plurality of steps in which the upper step is located inside the lower step. Since the side surface shape of the end of the multilayer rib is stepped, each end face of each step functions as a moment arm. Therefore, the arm length of the moment can be made shorter than when the end of the multilayer rib is formed in one step. For this reason, the maximum value of the moment of the force acting on the end face of the multilayer rib can be reduced.

The method for forming a rib structure according to the present invention comprises the following steps.
In the step (1), the end of the multilayer rib is formed in a step shape in which the height of each step is 1.5 to 4.0 times the thickness of the multilayer rib. In the method of forming a rib structure according to the present invention, in the first step, the end of the multilayer rib is formed in a step-like shape in which the length of each step is equal to or longer than the height of the step. The method for manufacturing a flat display according to the present invention includes a first step of forming a multilayer rib by applying an insulating paste in multiple layers on a rib forming region on the first or second substrate, and forming the multilayer rib on the first or second substrate. A second step of forming a rib by firing, wherein in the first step, the side surface shape of the end of the multilayer rib is a step-like shape including a plurality of steps in which the upper step is located inside the lower step. To form a multilayer rib.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this specification, the length in the direction perpendicular to the longitudinal direction of the rib and the length in the direction perpendicular to the substrate surface is referred to as the “height” of the rib, and is also parallel to the substrate surface. The length in the proper direction is called the “thickness” of the rib. Also, of the rib surfaces, the surface that comes into contact with the substrate surface is referred to as a “bottom surface”, and of the surfaces adjacent to the bottom surface, a surface parallel to the longitudinal direction of the rib is referred to as a “side surface”. A plane perpendicular to the plane is called an “end face”. Unless otherwise specified, the length of the rib in the longitudinal direction is referred to as “length”.

First, an embodiment of a method for forming a rib structure according to the present invention will be described. FIG. 1 is a process chart for explaining this embodiment. In this figure, the side surface of one rib is shown, but it is assumed that a plurality of ribs are formed in parallel with this rib. FIG. 2 is a schematic diagram for explaining the dimensions of each part of the rib shown in FIG.
2A is a cross-sectional view taken along the line IIa-IIa ′ of the rib shown in FIG. 1A, and FIG. 2B is a cross-sectional view taken along the line IIb-IIb ′ of the rib (multilayer rib) shown in FIG. FIG. 2C is a sectional view of FIG.
FIG. 2 is an enlarged view of an end IIc of a rib (multilayer rib) shown in FIG.

First, as shown in FIG. 1A, a rib 1 is formed in a rib forming area on a glass substrate 11 by using a screen printing method. At this time, the printing paste
An insulating paste obtained by mixing a resin mainly with a low melting point glass material and dissolving in a solvent, for example, a rib printing paste NP-78.
53J (manufactured by Noritake Company Limited) is used. The shrinkage ratio (volume after firing / volume before firing) of the printing paste NP-7853J during firing is 70 to 75%.
It is.

In this type of printing paste, when the cross section perpendicular to the longitudinal direction of the rib 1 is rectangular,
If the height of the rib 1 is higher than four times its thickness, warpage occurs during firing. Therefore, regarding the dimensions of the rib 1 shown in FIG.
4.0 times. For example, when the thickness w is about 100 μm, the height h1 is set to about 300 μm. In this step, the printing paste is multi-layer printed at a height of about 20 μm to form the ribs 1. At this time, after printing a certain layer,
Heat to 100-150 ° C and dry before printing the next layer on top of this layer.

Next, as shown in FIG. 1B, a rib 2 is formed on the rib 1. Multi-layer rib 1 by combining ribs 1 and 2
It is called 0. The rib 2 is formed by printing in the same manner as the rib 1. The dimensions of the rib 2 shown in FIG. 2B are also set in the same manner as the rib 1, for example, the thickness w is about 100 μm and the height h2 is 300.
It is about μm. However, the ribs 2 are formed such that the side surfaces of both ends in the longitudinal direction of the multilayer rib 10 have a stepped shape in which the upper stage is located inside the lower stage. That is, the rib 1
The end surface of the rib 2 is located inside the end surface of the rib 2. At this time, one end of the stepped end shown in FIG.
The length L1 of the step in the longitudinal direction (that is, the length of the exposed portion of the upper surface of the rib 1) L1 is equal to or greater than the height h1 of the first step (that is, the height of the rib 1). Is desirable. By doing so, warpage during firing can be prevented.

Next, the multilayer rib 10 composed of the ribs 1 and 2 is fired at about 500 to 550 ° C. to form the rib 12 as shown in FIG. During firing, components other than the glass material in the printing paste evaporate, so that the volume of the multilayer rib 10 gradually shrinks. For this reason, in FIG.
1, tension toward the center is also applied to the end face of the multilayer rib 10 shown in FIG.

However, since the side surfaces of both ends of the multilayer rib 10 are stepped, each of the end surfaces of the ribs 1 and 2 constituting the multilayer rib 10 functions as a moment arm. When both ends of the multilayer rib 10 are formed in a single step as in the prior art, the arm length of the moment is 600 μm (the height H of the multilayer rib 10).
By forming the arm in two steps as shown in (c), the arm length of the moment is 300 μm (the heights h1, h1 of the ribs 1, 2).
h2), which is の of the conventional value. Therefore, the maximum value of the moment of the force acting on the end face of the multilayer rib 10 can be reduced. For this reason, the adhesive force between the bottom surface of the multilayer rib 10 (rib 1) and the glass substrate 11 is
0, overcoming the moment based on the tension in
The bottom surface at the end of the (rib 1) does not come off the glass substrate 11. Further, both ends of the multilayer rib 10 are warped upward, and this portion does not rise.

As described above, since the shrinkage ratio of the printing paste is 70 to 75%, by firing the multilayer rib 10, a rib 12 having a height of about 450 μm and a thickness of about 100 μm is completed. Thus, a rib structure including a plurality of plate-shaped ribs 12 having a height higher than the thickness is completed.

In the above, the case where the side surface shape of the end portion of the multilayer rib 10 is formed in two steps has been described as an example, but it may be formed in three or more steps. FIG. 3 is a side view showing the dimensions of each part when the side surface shape of the end of the multilayer rib is formed in a four-step shape, and corresponds to FIG. 2 (c). In this case, a rib 3 is further formed on the rib 2, and then a rib 4 is formed on the rib 3. These ribs 3 and 4 are formed similarly to the ribs 1 and 2. Thus, the multilayer rib 10 having a four-layer structure composed of the ribs 1 to 4 is provided.
a is formed. Also for the multilayer rib 10a, it is desirable to form an end portion in a stepwise manner in which the length of each step in the longitudinal direction is equal to or longer than the height of the step. Therefore, the length in the longitudinal direction of the i-th stage (i = 1, 2, 3) (that is, the length of the exposed portion of the rib i) Li is also the height of the i-th stage (that is, the height of the rib i). ) The length should be equal to or greater than hi.

The multi-layer rib 10a shown in FIG. 3 is also subjected to multi-layer printing of a printing paste to form each of the ribs 1 to 4. Each time printing is performed, a step is formed at both ends of the multi-layer rib. You may. Thus, the multilayer rib 10
a is formed in a multi-step shape so that the multilayer rib 1
Even when the aspect ratio of Oa (height H / thickness w) is larger, that is, when the cross-sectional shape perpendicular to the longitudinal direction of the multilayer rib 10a is longer, both ends of the rib structure are formed so as not to be warped. it can. Therefore, the thickness of 100 to
For 150 μm, a rib having a height of 500 to 1000 μm can be formed.

In this embodiment, the ribs 1 to 4 are formed by the screen printing method. However, the present invention is not limited to this.
4 and the multilayer ribs 10 and 10a may be formed.
As described above, by using the method of forming a rib structure according to the present invention, both ends of the rib can be prevented from warping upward. Thereby, the height of the rib can be made uniform. In addition, if the both ends of the rib do not warp and do not float, the adhesive strength between the rib and the glass substrate 11 at both ends can be maintained. As described above, by using the method for forming a rib structure according to the present invention, the yield of ribs can be improved.

The rib structure thus formed is used for, for example, an FED (flat display). FIG.
FIG. 2 is a perspective view showing a partial configuration of an FED using a rib structure formed according to the present invention. FIG. 5 is a schematic diagram showing the relationship between the electron emission portion and the electron extraction electrode shown in FIG. In the FED shown in FIG. 4, a plurality of ribs 22 are formed on a cathode side glass substrate (first substrate) 21 at predetermined intervals. These ribs 22 are made of an insulating member such as glass. The dimensions of these ribs 22 are 50 μm in thickness.
m and a height of about 5 to 100 μm.

In the region on the cathode-side glass substrate 21 sandwiched between the ribs 22, an electron emitting portion 23 as a cathode is provided.
Are formed in a stripe shape. This electron emitting portion 23
For example, a carbon-based electron-emitting material such as a carbon nanotube can be used. Then, on the rib 22, an electron extraction electrode 24 having a large number of openings 24a is arranged. The electrode lead-out electrode 24 is divided into stripes in a direction orthogonal to the electron emission portions 23. As shown in FIG. 5, the electron emission portion 23 and the electron extraction electrode 2
The area that intersects with No. 4 constitutes one display dot 29.

Returning to FIG. 4 again, a plurality of ribs 26 are arranged orthogonally on the ribs 22. These ribs 22 are made of an insulating material such as glass, and are arranged in a boundary region between the electron extraction electrodes 24 divided into stripes.
Therefore, each of the divided electron extraction electrodes 24 is insulated and separated by the rib 26. The dimensions of the rib 26 are 100 to 150 μm in thickness, 500 to
1000 μm. A transparent anode-side glass substrate (second substrate) 25 is disposed on the rib 26 so as to face the cathode-side glass substrate. In other words, the plurality of ribs 26 are formed on the anode-side glass substrate 25 at predetermined intervals. The anode side glass substrate 25 and the cathode side glass substrate 21 form a vacuum container (envelope). The space between these substrates 21 and 25 is rib 2
Since they are held by the internal pressures 2 and 26, the central portions of the substrates 21 and 25 do not bend inward due to the difference between the internal pressure and the external pressure.

A light emitting portion 27 made of a phosphor is provided in a region between the ribs 26 on the inner surface of the anode-side glass substrate 25.
Are formed, and a metal back film 28 as an anode is formed on the inner surface of the light emitting portion 27. Therefore, the light emitting section 27 and the metal back film 28 have a structure divided into stripes corresponding to the electron extraction electrodes 24.

The operation of the FED shown in FIG. 4 will be briefly described. When a potential of several hundreds to several tens of volts is applied to the electron emitting portion 23 and a potential of several tens to several hundreds of volts is applied to the electron extracting electrode 24, the potential of the electron emitting portion 23 and the electron extracting electrode 24 is reduced. Electrons are emitted from the intersection region. At this time, if a potential of 4 to 10 kV is applied to the metal back film 28, the emitted electrons reach the light emitting portion 27 in the portion facing the above-mentioned intersection region, and the light emitting portion 27 in this portion is turned on. I do. In addition, as shown in FIG.
4 and the light-emitting portion 27 are connected to the adjacent electron extraction electrode 2.
4 and the light emitting part 27 and the rib 26,
Electrons extracted by a certain electron extraction electrode 24 are
There is no collision with the light emitting unit 27 facing the adjacent electron extraction electrode 24.

The fluorescent material constituting the light emitting section 27 is C
A high-luminance phosphor used for RT or the like is used. This kind of phosphor does not emit light unless electrons having a high energy of 4 to 10 keV are collided. In order to give such high energy to the electrons, the electron emission portion 23
A high voltage of about several kV must be applied between the metal back film 28 and the metal back film 28. At this time, if the distance between the electron emitting portion 23 and the metal back film 28 is small, a discharge occurs, so that the distance needs to be 500 to 1000 μm.

Further, the electron emitting portion 23 and the metal back film 2
The travel distance of the electrons emitted from the electron emission portion 23 is increased by increasing the interval between the electron emission portion 8 and the electron emission portion 8. If the traveling distance of the electrons is long, the trajectories of the electrons can be made uniform by diffusing the electrons. As a result, luminance unevenness does not occur in each display dot 29, and an effect that a glossy display can be realized as the whole FED is obtained. For this reason, the size of the rib 26 is set to a thickness of 100 to 150 μm as described above,
The height is 500 to 1000 μm.

However, when the rib 26 having such a large aspect ratio is formed by a conventional method, both ends of the rib 26 are warped. For this reason, the rib 26 is formed using the method shown in FIG. 1, that is, a method in which the side surfaces of both ends of the multilayer ribs 10 and 10a are formed in a step shape to suppress warpage during firing.
To form Since the ribs 26 formed using this method have a uniform height, the distance between the electron emitting portion (cathode) 23 and the electron extraction electrode and the metal back film (anode) becomes constant. For this reason, since the electrons reach the light emitting portion 27 uniformly, uniform light emission between the display dots 29 is obtained.

The rib structure formed according to the present invention can also be used for a fluorescent display tube (flat display) using a rib grid. This type of fluorescent display tube is described in, for example, Japanese Patent Application Laid-Open No. H11-213924. FIG.
FIG. 1 is a cross-sectional view showing a partial configuration of a fluorescent display tube using a rib structure formed according to the present invention. In this fluorescent display tube, an anode 32 having a square planar shape is arranged on a substrate (first substrate) 31 in a matrix of about several tens to several hundreds columns × several tens of rows. Further, on the anode 32, as shown in FIG. 6, a light emitting section 33 made of a phosphor is formed.

A plurality of ribs 34 are formed on the substrate 31 at a predetermined interval, and the anode 32 and the light emitting section 33 forming a pair are entirely surrounded by the ribs 34. I have. These ribs 34 are made of an insulating member. For this reason, the anode 32 and the light emitting unit 33 are insulated and separated from the adjacent anode 32 and light emitting unit 33 by the rib 34. As these ribs 34, ribs formed by the method shown in FIG. 1 are used.

On the upper surface of the rib 34, a rib grid 3
5 are formed. The rib grid 34 is fixed on the rib 34 by printing a thick-film conductor paste containing a particulate conductive material such as silver, palladium, aluminum, nickel, or carbon in a thickness of 10 to 50 μm, and firing. Form. Above the rib grid 35, a plurality of cathodes 36 composed of filaments are arranged in parallel with each other. These anode 32, light emitting section 33,
A frame-shaped spacer (not shown) is arranged on the periphery of the substrate 31 on which the ribs 34, the rib grid 35 and the cathode 36 are mounted, and a transparent cover glass (second Substrate 37) is disposed. These substrate 31, spacer and cover glass 3
7 are mutually glass-sealed to form a vacuum container (envelope).

The operation of the fluorescent display tube shown in FIG. 6 will be briefly described. When a positive voltage (acceleration voltage) of about several tens of volts is applied to a predetermined rib grid 35 with a heat current flowing through each cathode 36, thermions emitted from the cathode 36 are It accelerates toward the light emitting section 33 surrounded by the rib grid 35. At this time, if a positive voltage is applied to the anode 32 surrounded by the rib grid 35, the thermoelectrons collide with the light emitting unit 33 on the anode 32 to cause the light emitting unit 33 to emit light. On the other hand, even if a positive voltage is applied to the anode 32, if a negative voltage (cutoff bias) is applied to the rib grid 35 surrounding the anode 32, the thermoelectrons do not reach the light emitting section 33 and do not emit light.

In the fluorescent display tube operating as described above,
Scanning is performed by sequentially applying an acceleration voltage to each row of the rib grid 35 (in FIG. 6, in the left-right direction), and by selectively applying a positive voltage to each anode 32 in synchronization with the scanning, a dynamic A desired pattern can be displayed by driving. In the fluorescent display tube shown in FIG.
Is used, it is not necessary to use a mesh grid provided so as to cover all the light emitting units 33. For this reason, there is an advantage that a problem that occurs when the mesh grid is enlarged along with an increase in the size of the display screen, that is, display defects such as luminance unevenness and short circuit due to thermal deformation can be eliminated.

[0039]

As described above, in the method of forming the rib structure according to the present invention, the side surface of the end of the multilayer rib is formed in a step shape. By firing such a multilayer rib,
The end of the completed rib can be suppressed from warping upward. Thereby, the height of the rib can be made uniform. Further, the adhesive strength between the bottom surface of the end of the rib and the substrate can be maintained.
As described above, according to the present invention, the yield of the rib structure can be improved. In the method for forming a rib structure according to the present invention,
The height of each step of the end of the multilayer rib is set at 1.
It is formed in a stepped form that is 5 to 4.0 times. In addition, the end of the multilayer rib is formed in a step shape in which the length of each step is equal to or longer than the height of the step. This can prevent the end of the completed rib from warping upward.

In the method of manufacturing a flat display according to the present invention, the rib structure of the flat display is formed by the above-described method. Thereby, even if the rib has a large aspect ratio, the height can be formed uniformly. Therefore, the brightness can be increased without impairing the uniform light emission of the flat display.

[Brief description of the drawings]

FIG. 1 is a process chart for explaining an embodiment of a method for forming a rib structure according to the present invention.

FIG. 2 is a schematic diagram for explaining dimensions of each part of a rib shown in FIG. 1;

FIG. 3 is a side view showing the dimensions of each part when the side surface shape of the end of the multilayer rib is formed in four steps.

FIG. 4 shows F using a rib structure formed according to the present invention.
FIG. 3 is a perspective view illustrating a configuration of a part of the ED.

FIG. 5 is a schematic diagram showing a relationship between an electron emission portion and an electron extraction electrode shown in FIG.

FIG. 6 is a cross-sectional view showing a partial configuration of a fluorescent display tube using a rib structure formed according to the present invention.

FIG. 7 is a process chart for explaining a conventional method for forming a rib structure.

FIG. 8 is a perspective view showing a partial configuration of an FED having a rib structure.

FIG. 9 is a side view for explaining a problem of a conventional method for forming a rib structure.

FIG. 10 is a schematic diagram for explaining the principle that both ends of the rib shown in FIG. 9 are warped upward.

[Explanation of symbols]

1 to 4, 12, 26, 34: rib, 10, 10a: multilayer rib, 11: glass substrate, H, h1 to h4: height, L1
L3: length in the longitudinal direction, w: thickness.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Junko Yoya 700 Wada, Uenocho, Ise-shi, Mie F-term in Ise Electronics Industry Co., Ltd. (reference) 5C012 AA05 BB01 BB07

Claims (4)

[Claims] 1. A method for forming a rib structure comprising a plurality of plate-shaped ribs formed on a substrate and having a height higher than a thickness, wherein a plurality of insulating pastes are applied to the rib forming region on the substrate in a multilayer manner. A first step of forming a multilayer rib; and a second step of firing the formed multilayer rib. In the first step, the side shape of the end of the multilayer rib is such that the upper part is lower than the lower part. Forming the multi-layered ribs so as to form a stepped shape including a plurality of steps positioned inside. 2. In the first step, the height of each step of the end of the multilayer rib is set to 1.5 to 1.5 times the thickness of the multilayer rib.
2. The method for forming a rib structure according to claim 1, wherein the rib structure is formed in a step-like shape which is 4.0 times. 3. The method according to claim 1, wherein, in the first step, an end of the multilayer rib is formed in a step shape in which each step has a length equal to or greater than the height of the step. Item 3. The method for forming a rib structure according to Item 1 or 2. 4. An envelope comprising a first substrate and a transparent second substrate disposed opposite to the first substrate, and a predetermined space on an inner surface of the first or second substrate. A method of manufacturing a flat display, comprising: a plurality of ribs formed at intervals; and a light-emitting portion formed in a region between the ribs on the inner surface of the first or second substrate on which the ribs are formed. A first step of forming a multi-layer rib by applying an insulating paste in multiple layers on a rib formation region on the first or second substrate; and forming the rib by firing the formed multi-layer rib A second step of forming the multilayer rib in the first step so that a side surface shape of an end of the multilayer rib has a stepped shape including a plurality of steps in which an upper step is located inside a lower step. Manufacture of flat display characterized by forming Method.