JPH0660830A - Plane type display - Google Patents

Abstract

PURPOSE:To reduce luminance shortage, luminance fluctuation, and irregular color by keeping constant a distance between electrodes of a plurality of electrode groups with respect to an electron flow to be emitted from a linear heat cathode. CONSTITUTION:In a plane tape display, first control electrode groups 9 and second control electrode groups 10 in a control electrode unit 6 for controlling an electron flow are formed approximately in parallel with respect to an electron emitting source for emitting an electron. A distance between the electrodes is kept constant by an insulative bonding layer 20 of a dot type or the like. Consequently, since a stress produced by heat generation during operation or in a manufacturing process can be alleviated and electrode strain can be restrained, it is possible to prevent the deformation or breakage of the electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device using an electron beam, and more particularly to an electrode structure such as a control electrode section for controlling a flow of electrons emitted from the electron emission source.

[0002]

2. Description of the Related Art An example of a conventional flat panel display device will be described with reference to FIGS. 7 and 8 are a perspective view and a sectional view of a conventional flat-panel display device, respectively. In these figures, 1 is a linear hot cathode that is connected to a support (not shown) and emits electrons when energized, and 2 is elliptical in cross section, covers the upper surface of the linear hot cathode 1 and passes electrons. 3 is a back electrode, and 6 is a control electrode section for passing or blocking the electrons extracted by the perforated cover electrode 2.

The control electrode portion 6 has a plurality of electron passage holes 7 corresponding to pixels processed by a method such as etching on a metal plate, and an insulation applied so as to cover the surface of the metal plate. An insulating substrate 8 having a film, and a first control electrode group 9 and a second control electrode group 1 for applying a potential to the upper surface and the lower surface of the insulating substrate 8 corresponding to each row or column of pixels.
It consists of 0 and. In this case, the first control electrode group 9 and the second control electrode group 10 are arranged on the upper and lower surfaces of the insulating substrate 8 at right angles to each other, and each of the first control electrode 9a and the second control electrode Part of 10a has such a shape that it is inserted into the electron passage hole 7. 4 is a front glass, three kinds of phosphors 5 which emit red, green and blue by electronic excitation are coated in a dot shape, and an aluminum film for giving conductivity is formed on the surface of the phosphor. 1 on this front glass 4
By applying a voltage of about 0 to 30 KV, the electrons that have passed through the control electrode portion 6 are accelerated to excite the phosphor 5 to emit light.

That is, the thermoelectrons emitted from the linear hot cathode 1 are extracted by the perforated cover electrode 2 and further included in the first control electrode group 9 provided so as to be orthogonal to the linear hot electrode 1. Approximately 20 for the potential of the linear hot cathode 1
By applying a positive potential of ˜40 V, thermoelectrons are attracted to this electrode and reach the control electrode section 6. Here, by adjusting the elliptic cylinder shape of the perforated cover electrode 2, the positional relationship with the first control electrode group 9, and the voltage applied to each electrode, any one of the first control electrode group 9 can be adjusted. The electron flow density on the front surface of the electrode of the book is almost uniform.

The operation of the control electrode section 6 is as follows. As described above, if only one first control electrode 9a of the first control electrode group 9 has a positive potential (on state) and the other has 0 V or a negative potential (off state), linear heat is generated. The thermoelectrons emitted from the cathode 1 are attracted only to the one control electrode 9a in the ON state, and enter the row of electron passage holes 7 in which the control electrode 9a is provided.

All the electrons that have entered the electron passage hole 7 do not pass through to the front glass 4 side as they are, but the electrons of the second control electrode group 10 provided on the front glass 4 side of the electron passage hole 7 are not changed. Of which, for example, one second control electrode 1 in the ON state to which a positive potential of 40 to 100 V is applied
Electrons pass only through the electron passage hole 7 corresponding to 0a and other O
It does not pass through the electron passage hole 7 corresponding to one control electrode 10a in the OFF state which is at V or a negative potential.

Therefore, one first control electrode 9a in the ON state of the first control electrode group 9 and the second control electrode group 1
Electrons pass only through the electron passage holes 7 at the intersections with one second control electrode 10a of 0 state. Then, due to the passing electrons, the phosphor 5 at the position of the pixel corresponding to the electron passing hole 7 emits light, and display is performed. That is, a desired image can be displayed by controlling the voltage application to the control electrodes 9a and 10a so that the intersections correspond to the desired positions.

For example, one control electrode 9a of the first control electrode group 9 is sequentially turned on one by one, and in the second control electrode group 10 corresponding to the position to emit light in synchronization with it. An image is displayed by turning on an arbitrary control electrode 10a and repeating (scanning) 60 cycles per second such that it is not felt by human eyes.

Each control electrode 9 and 10 has an electron passage hole 7
It's getting in, but when you turn it off,
This is for blocking the passage of electrons by applying a small negative potential of OV from the OV to each control electrode, and for effectively applying an electric field to the electrons entering the electron passage hole 7. .

Further, in FIG. 7, the first control electrode group 9 and the second control electrode group 9
The control electrode group 10 of is formed on the insulating substrate 8,
Since it is difficult to process each control electrode into the electron passage hole 7 and separate the control electrode at the center of the electron passage hole 7, the first control electrode group 9 and the second control electrode group 10 are substantially separated from each other. As described later, they are formed on different insulating substrates. Further, a focusing electrode 11 for focusing the electrons that are going to diverge after passing through the control electrode 6 may be installed on the front glass 4 side of the control electrode unit 6.

Next, a method of fixing the control electrode portion will be described with reference to FIG. FIG. 8 is a cross-sectional side view of a flat-panel display device, which is different from FIG. The control electrode unit 6 includes an insulating substrate 8a on which the first control electrode group 9 is formed and the second control electrode group 1
0 is formed on the insulating substrate 8b, and each is fixed by a nut 30 to a pillar 33 of an insulating material such as ceramics, which is passed through fixing holes provided at the four corners of the substrate. Similarly, 11 also has fixing holes at four corners, and is fixed coaxially with the support column 33. The distance between the focusing electrode 11 and the front glass 4 and the distance between the control electrode portion 6 and the focusing electrode 11 are held by insulating collars 31 and 32 passed through the support column 33, respectively.

[0012]

In such a conventional example, the first control electrode group 9, the second control electrode group 10 and the focusing electrode 11 are only fixed to the columns at the four corners with nuts. Therefore, the distance between the electrodes does not become constant due to the distortion or bending of the electrode substrate. For example, when the electrode distance between the first control electrode group 9 and the second control electrode group 10 increases, some of the electrons that have passed through the first control electrode group 9 deviate from the orbit, enter the gap between the electrodes, and originally pass through. The first control electrode 10 passes through the adjacent hole of the second control electrode 10, or collides with the rear surface of the second control electrode group 10 to cause charge-up in which the insulation is destroyed, and the like. There is a problem such as finding out image information applied to the control electrode group 9 and the second control electrode group 10. In addition, the focusing electrode 11 and the second control electrode 1
When the electrode interval of 0 is widened, the electron flow cannot be narrowed down, and there is a problem that one electron flow is irradiated to a plurality of phosphors and light is emitted in multiple colors.

The present invention has been made to solve the above-mentioned problems, and keeps the distance between electrodes of a plurality of electrode groups constant with respect to the electron flow emitted from the linear hot cathode. Therefore, it is an object of the present invention to obtain a flat-panel display device having less brightness, uneven brightness, and uneven color.

[0014]

In order to achieve the above object, the present invention provides a flat display device in which a constant distance is provided between a first control electrode group and a second control electrode group forming a control electrode portion. In order to keep it, an insulating bonding layer formed by printing an insulating material paste such as frit glass on the bonding surface side is provided. Further, another invention of the present invention is, in a flat-panel display device, to keep constant between a first control electrode group and a second control electrode group forming a control electrode portion and between the control electrode portion and a focusing electrode. Therefore, an insulating bonding layer formed by printing an insulating material paste such as frit glass on the bonding surface by a printing method is provided.

Still another invention of the present invention is the above-mentioned one, wherein the shape of the insulating bonding layer formed on the bonding surface between the first control electrode group or the second control electrode group and the focusing electrode. Are formed in a dot shape, a linear shape, a grid shape, or a cross shape, so that the contact surface between the insulating bonding layer and the electrode substrate material is reduced.

[0016]

Therefore, in the flat panel display device of the present invention, the first control electrode group and the second control electrode group forming the control electrode section, or between the respective control electrode groups and between the control electrode section and the control electrode section are focused. The first control electrode group and the second control electrode group are fixed substantially parallel to each other by providing an insulating bonding layer for insulating and bonding the insulating paste such as frit glass by a printing method between the electrodes. To do. As a result, the distance between the electrodes can be kept uniform, the on / off control characteristics of electrons in the control electrode portion are improved, and the uneven brightness on the display screen is reduced. In addition, since it is possible to prevent charge-up that induces dielectric breakdown on the control electrode due to electrons flowing into the gap between the electrodes, the charge-up on the control electrode locally increases the negative potential on the control electrode, The brightness unevenness on the display screen caused by the electrons being pushed back towards the electron emission source is reduced.

Further, since the function of the focusing electrode is not impeded by keeping the electrode spacing between the focusing electrode and the second control electrode group uniform by the insulating bonding layer, the focusing electrode focuses the electron flow and one electron The flow can be prevented from reaching a plurality of phosphors at the same time, and uneven coloring is reduced.

Further, in another invention of the present invention, the shape of the insulating bonding layer is formed in a dot shape, a linear shape, a grid shape or a cross shape to reduce the contact surface between the insulating bonding layer and the electrode substrate material. Thereby, the strain of the electrode substrate caused by the difference in thermal expansion between the insulating bonding layer and the electrode substrate material is reduced, so that peeling of the insulating bonding layer can be prevented and the distance between the electrodes can be kept uniform.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. Embodiment 1 FIG. 1 is a sectional perspective view of a control electrode portion of a flat panel display device according to an embodiment of the present invention. This embodiment is different from the above-mentioned conventional example in that the insulating substrate 8a is provided in order to keep the distance between the electrodes of the first control electrode group 9 and the second control electrode group 10 constituting the control electrode portion 6 constant. That is, the insulating bonding layer 20 formed by printing an insulating material paste such as frit glass on the upper bonding surface is provided.

In this case, as shown in FIG. 1, the insulating bonding layer 20 is made of frit glass formed by mixing powder glass into a solvent to form a paste, and forming the first control electrode group 9 and the second control electrode group 9 on the insulating substrate 8a. On the side where the control electrode group 10 is not formed, that is, after printing in a dot shape on the bonding surface by, for example, a printing machine, the solvent is sublimated, the temperature is further raised to the recrystallization temperature, and then solidified by cooling, In this example, the insulating bonding layer 20 has a diameter of 0.2 mm and a height after solvent sublimation of 0.08 mm. In addition, the dot-shaped insulating bonding layers 20 are arranged in a staggered manner with respect to the electron passage holes 7 at the midpoint between the adjacent electron passage holes 7 at a pitch of 0.7 mm. In the figure, the same reference numerals as those in FIGS. 7 and 8 indicate the same or corresponding portions.

Here, in the present invention, the insulating bonding layer 20 and the insulating film materials of the insulating substrates 8a and 8b, and the focusing electrode substrate are the insulating bonding layer 20 and the insulating substrate 8a caused by a difference in elongation due to heat during the manufacturing process or during operation. , 8b, it is necessary to select a material having a small difference in thermal expansion coefficient in order to prevent the insulating film from cracking. In the present embodiment, the insulating bonding layer 20 has an expansion coefficient of 4 to 5 × 10 ⁻⁶ / ° C., the insulating film material of the insulating substrates 8 a and 8 b has an expansion coefficient of 5 × 10 ⁻⁶ / ° C., and the focusing electrode has an expansion coefficient. Used a material of 1.2 × 10 ⁻⁶ / ° C. And
By forming the insulating bonding layer 20 into a circular shape having a small diameter, the stress generated by thermal expansion is reduced.

As described above, according to the above-described embodiment, the first control electrode group 9 and the second control electrode group 10 of the control electrode section 6 for controlling the electron flow of the electron emission source that emits electrons are almost formed. Since the electrodes are formed in parallel and the distance between the electrodes is kept constant by the dot-shaped insulating bonding layer 20, the stress generated by heat generation during operation or in the manufacturing process can be relaxed and the electrode strain can be suppressed. It is possible to prevent deformation and destruction of the electrodes.

Embodiment 2 FIG. 2 is a sectional perspective view of a control electrode portion and a focusing electrode of a flat panel display device according to another embodiment of the present invention. In this embodiment, the difference from that of FIG. 1 is that, as shown in FIG. 2, a second electrode is formed on the control electrode side of the focusing electrode 11 or on the second control electrode group 10 in the same manner as the insulating bonding layer 20. That is, the insulating bonding layer 21 is formed linearly in a direction orthogonal to the control electrode group 10 and the distance between the electrodes is kept constant. In this case, the width of the linear insulating bonding layer 21 is 0.1.
mm, the height after solvent sublimation is 0.08 mm. Further, they are arranged at the intermediate points of the electron passage holes 7 at the same pitch as between the electron passage holes 7, for example, 0.7 mm pitch. In addition,
An insulating bonding layer 20 is formed between the insulating substrates 8a and 8b.

As described above, according to this embodiment, the first control electrode group 9 and the second control electrode group 1 forming the control electrode portion 6 are formed.
0 between the electrodes and the second control electrode group 10 and the focusing electrode 1
The distance between one electrodes can be kept constant by each insulating bonding layer. For this reason, in addition to the effects of the above-described embodiment, the original function of the focusing electrode can be exhibited, so that it is possible to prevent one electron flow from reaching a plurality of phosphors at the same time.

Embodiment 3 FIG. 3 is a sectional view of a control electrode portion of a flat panel display device according to another embodiment of the present invention. In this example, FIG.
3 is different from that of FIG.
By the insulating bonding layer 25 printed and solidified on the side where the control electrode group is not formed on the a and 8b and the insulating bonding layer 26 formed on the insulating bonding layer 25 in the same manner, The electrode distance between the two insulating substrates 8a and 8b, that is, the electrode distance between the first control electrode group 9 and the second control electrode group 10 can be arbitrarily set. In this case, the insulating bonding layer 2
The heights of both 5 and 26 are 0.08 mm, and the distance between the insulating substrate 8a and the insulating substrate 8b is 0.24 mm. The first
The second control electrode groups 9 and 10 are not shown.

As described above, according to this embodiment, the insulating substrate 8a on which the first control electrode group is formed and the insulating substrate 8b on which the second control electrode group is formed are desired by repeating printing and baking and solidification. It is possible to set the interval of.
In addition, when the printed shapes of the insulating bonding layers 25 and 26 are both dot-shaped, it is difficult to print the insulating bonding layer 26 on the insulating bonding layer 25 accurately.
If 5, 5 and 26 are formed in a linear shape and the insulating bonding layers 25 and 26 are formed so as to be orthogonal to each other, the insulating bonding layers will always be orthogonal, that is, overlap even if printing misalignment occurs. There is an advantage that the distance between the electrodes does not change due to the positional deviation. The height of the insulating bonding layer can be changed by changing the plate thickness of the printing mask.

Embodiment 4 FIGS. 4, 5 and 6 are cross-sectional perspective views of a control electrode portion of a flat panel display device according to still another embodiment of the present invention. Here, 22, 23 and 24 are frit glass obtained by forming powder glass into a paste with a solvent, on the side where the first control electrode group 9 and the second control electrode group 10 are not formed on the insulating substrate 8a, that is, the bonding. After being printed on the surface in a linear, grid, and cross shape, for example, by a printing machine, the solvent is sublimated,
Further, the insulating bonding layer is heated to the recrystallization temperature and solidified after cooling. In these examples, the width of the insulating bonding layer is 0.1 mm.
The height after solvent sublimation is 0.08 mm. The linear, lattice-shaped and cross-shaped insulating bonding layers 22 to 24 are formed in the middle of the electron passage hole 7 at a pitch of 0.7 mm. The first embodiment is also used between the control electrode portion 6 configured in this manner or between other electrodes such as a focusing electrode and an accelerating electrode.
Has the same action and effect as.

In any of the above examples, the material of the insulating bonding layer is not limited to frit glass as long as the conditions of heat resistance, vacuum resistance, insulation resistance and workability are satisfied. In addition to the above-described embodiment, the control electrode section is a control electrode group including thin plate electrodes formed in a film shape on a conductive substrate (surface insulating substrate) having an insulating layer on the surface. May be.

[0029]

As described above, according to the present invention, in the flat panel display device, at least the first control electrode portion is formed.
Between the control electrode group and the second control electrode group, or between the control electrode group electrodes, and between the control electrode portion and the focusing electrode to form a dot shape to insulate and bond the electrodes. Since the insulating bonding layer is provided, the distance between the electrodes can be kept uniform. Therefore, the on / off control characteristics of the electrons in the control electrode portion are improved, the brightness unevenness on the display screen is reduced, and the charge-up on the control electrode due to the electrons sneaking into the gap between the electrodes can be prevented. This can prevent the discharge phenomenon on the control electrode, and the charge-up on the control electrode locally increases the negative potential on the control electrode, so that the electrons are pushed back toward the electron emission source. Since this can be prevented, there is an effect that uneven brightness on the display surface is reduced.

Further, according to another invention of the present invention, the shape of the insulating bonding layer formed on the first control electrode group or the second control electrode group and the focusing electrode of the control electrode portion is a dot shape. Since the contact surface between the insulating bonding layer and the electrode substrate material is reduced by forming it in a linear shape, a grid shape or a cross shape, the stress generated due to the difference in thermal expansion between the insulating bonding layer and the electrode substrate material is relaxed. The strain due to heat of the electrode substrate can be reduced. Therefore, peeling of the insulating bonding layer can be prevented, and the distance between the electrodes can be kept uniform.

[Brief description of drawings]

FIG. 1 is a sectional perspective view of a control electrode portion of a flat panel display according to a first exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional perspective view of a control electrode unit and a focusing electrode unit of a flat panel display according to a second exemplary embodiment of the present invention.

FIG. 3 is a sectional side view of a control electrode portion of a flat panel display according to a third exemplary embodiment of the present invention.

FIG. 4 is a cross-sectional perspective view of a control electrode portion of a flat panel display device according to a fourth exemplary embodiment of the present invention.

FIG. 5 is a sectional perspective view showing a control electrode portion of a flat panel display according to another embodiment 4 of the present invention.

FIG. 6 is a sectional perspective view showing a control electrode portion of a flat panel display according to another embodiment 4 of the present invention.

FIG. 7 is a cross-sectional perspective view showing a conventional flat-panel display device.

FIG. 8 is a cross-sectional side view showing a method of fixing a control electrode portion of a conventional flat-panel display device.

[Explanation of symbols]

 1 Linear Hot Cathode 2 Effective Cover Electrode 3 Back Electrode 4 Front Glass 5 Phosphor 6 Control Electrode Part 7 Electron Passage Hole 8 Insulating Substrate 9 First Control Electrode Group 10 Second Control Electrode Group 11 Focusing Electrode 20 Insulating Bonding Layer (Dot shape) 21 Insulating bonding layer (Linear / on second control electrode group) 22 Insulating bonding layer (Linear) 23 Insulating bonding layer (Lattice shape) 24 Insulating bonding layer (Cross shape) 25 Insulating bonding layer (Baking 26) Insulation bonding layer (unbaked and solidified)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiji Fukuyama 2-14-40 Ofuna, Kamakura-shi, Kanagawa Mitsubishi Electric Corporation

Claims (3)

[Claims] 1. A linear hot cathode and at least a through hole which covers the linear hot cathode and is arranged substantially parallel to the linear hot cathode and through which electrons emitted from the linear hot cathode pass. A control electrode unit for controlling the emitted electron flow passing by a thin plate electrode formed in a film shape on an insulating substrate or a conductive substrate having an insulating layer, and an electron flow irradiation arranged substantially parallel to the control electrode unit. In a flat-panel display device having a display surface coated with a light-emitting body that emits light according to the above, between the first control electrode group and the second control electrode group that form the control electrode unit A flat panel display device comprising an insulating bonding layer formed by using an insulating material paste such as frit glass for insulation and bonding. 2. A linear hot cathode and at least a through hole which covers the linear hot cathode and is arranged substantially parallel to the linear hot cathode and through which electrons emitted from the linear hot cathode pass. A control electrode part for controlling the emitted electron flow passing by a thin plate electrode formed in a film shape on an insulating substrate or a conductive substrate having an insulating layer, and an emission electron flow arranged substantially parallel to the control electrode part. In a flat display device comprising a focusing electrode for focusing and a display surface coated with a luminous body which is arranged substantially parallel to the control electrode portion and emits light when irradiated with an electron stream, the control electrode portion comprising: Between the first control electrode group and the second control electrode group and between the control electrode portion and the focusing electrode, an insulating material paste such as frit glass is used to insulate and bond the electrodes. Insulation bonding layer Flat-panel display according to claim. 3. The flat-panel display device according to claim 1, wherein the insulating bonding layer is formed in a dot shape, a linear shape, a grid shape, or a cross shape.