JPH06101314B2 - Display device - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to a display device, and more particularly to the internal structure of a fluorescent display device. [Prior Art] A conventional device of this type will be described with reference to the matrix CRT shown in FIGS. 5 and 6, and the matrix CRT generally has a rectangular shape in which a phosphor 1 as a display pixel is formed. The shaped face glass 2 serves as a light emitting portion, the back surface side of the face glass 2 is covered with the conductive film 4 for applying a high voltage from the anode 3, and further the spacer glass 5 along the shape is welded to the back side of the face glass 2. Then, the glass substrate 6 is welded to the rear surface of the spacer glass 5 to form a vacuum inside. Inside the vacuum, a filament 7 serving as a cathode electrode for generating thermoelectrons, a first control grid 8 for accelerating the thermoelectrons to collide with the phosphor 1 of the face glass 2 and emit predetermined information, and The second grid 9 is sequentially arranged toward the light emitting unit side. A low voltage is applied to the filament 7 and the first and second control grids 8 and 9 through a low voltage pin (not shown) and an external electrode 10 connected to the low voltage pin to generate thermoelectrons in the filament 7. , The first control grid 8 and the second control grid 9 are selectively applied with an operating voltage so that the openings 8a, 9 are respectively formed.
The a is allowed to pass through and the thermoelectrons collide only with the predetermined phosphor 1 to excite the phosphor 1 to emit light. That is,
If the potentials applied to the first and second control grids 8 and 9 are both positive with respect to the filament 7, the electrons generated in the filament 7 pass through the openings 8a and 9a and collide with each phosphor 1 to cause fluorescence. Displayed, that is, the device is in the ON state. Conversely, the
If both the first control grid 8 and the second control grid 9 are negative with respect to the filament 7, or if either one of the grids is negative, electrons do not pass through the openings 8a and 9a, and the device is turned off. . In this way, the device is controlled to be turned on and off according to the potential state applied to the first and second control grids 8 and 9.
Then, the display of the halftone image can be realized by controlling the time width of the ON state. In addition, 11 is an electrode also serving as a support member for laying the filament 7 on the glass substrate 6, 12 is an external electrode connecting portion, and 13 is an exhaust port.

[Problems to be Solved by the Invention]

Since the conventional device is configured as described above, the electrode structure is complicated because the first and second control grids 8 and 9 are sequentially interposed between the light emitting portion serving as the anode and the filament 7 serving as the cathode. Therefore, it has a problem that it is vulnerable to mechanical vibration and hinders improvement of reliability. The present invention has been made to solve the above problems, and reduces the number of parts of the electrode structure to simplify the structure.
The purpose is to obtain a display device with earthquake resistance.

[Means for solving problems]

The display device according to the invention of claim 1 is arranged between a filament and an anode laid on a substrate, and an acceleration electrode for accelerating electrons generated from the filament to collide with a phosphor, The first and second control electrodes, which are provided on the back surface of the filament, control the electric field of the filament portion according to the potential relationship applied to each filament and control the generation of electrons from the filament. The display device according to the invention of claim 2 is:
An opening is provided corresponding to the phosphor, and is arranged between a filament and an anode installed on the substrate, and an accelerating electrode that accelerates electrons generated from the filament to collide with the phosphor, Provided on the back,
It is provided with first and second control electrodes for controlling the electric field of the filament portion according to the potential relationship applied to each and controlling the generation of electrons from the filament.

[Action]

In the display device according to the present invention, by disposing the first and second control electrodes on the back surface of the filament, the internal structure is simplified and the earthquake resistance is enhanced. Further, by providing the acceleration electrode between the filament and the anode, the influence of the anode electric field on the first and second control electrodes is shielded and the directivity of the electrons generated from the filament is improved.

【Example】

Hereinafter, based on the embodiments shown in FIGS. 1 to 3, the same or corresponding portions as those of the conventional one will be designated by the same reference numerals, and the description will focus on the features of the present invention. FIG. 1 is an exploded perspective view of the apparatus of this embodiment, FIG. 2 is an overall perspective view showing its assembled state, and FIGS. 3 and 4 are views showing light emitting portions showing different phosphor arrangements. As shown in FIG. 1, the glass substrate (substrate) 6 has
Second control grids (first and second control electrodes) 8 and 9 are printed, and these are provided in a matrix corresponding to the respective phosphors 1 of the light emitting section facing each other. Moreover, the first
The first and second control grids 8 and 9 are formed so as to mesh with each other via the corrugated ends.
Is electrically connected to the external electrode connecting portion 12.
The filament 7 is provided between the electrodes 11 and 11 along the upper part of the row formed by the grids 8 and 9. Further, above each filament 7, a plate-like electrode covering the glass substrate 6 is provided.
15 are provided, and the plate-like electrode 15 is formed so that thermoelectrons from each filament 7 pass through the holes 15a corresponding to the first and second control grids 8 and 9. FIG. 2 shows the assembled parts of FIG. 1. Therefore, the thermoelectrons generated in the filament 7 are effectively removed by the potential of the plate-shaped electrode 15 disposed above the filament 7 while the effect of the electric field of the anode to which a high voltage is applied, that is, the light emitting portion is removed. The first and second
ON / OFF control of the control grids 8 and 9 can be effectively performed. Further, it is more effective if the openings 15a provided in the plate-shaped electrode are formed in a fine mesh shape or a slit shape. Moreover, by appropriately selecting the voltage applied to the plate electrode 15, the effect of focusing the electrons by the hole 15a can be obtained. More importantly, since the first and second control grids 8 and 9 are formed by printing on the glass substrate 6 in the above-described embodiment, mechanical vibration can be eliminated, and a display device having excellent seismic performance can be obtained. Obtainable. In addition, the yield of each component can be improved by reducing the number of components. That is, the electrons generated from the filament 7 are controlled by the potential relationship between the first and second control grids 8 and 9. Now, assuming that the potentials of the first and second control grids 8 and 9 are both positive with respect to the filament 7,
The electric field in the vicinity of the filament 7 becomes a positive electric field, and the electrons generated from the filament 7 are diverged due to the influence of the positive electric field and collide with the phosphor 1 through the holes formed in the plate electrode 15 to cause fluorescent display. Here, the plate electrode 15 functions as an accelerating electrode for accelerating the electrons generated from the filament 7, and has the effect of shielding the influence of the anode electric field on the first and second control grids 8 and 9. , And also has the function of improving the directivity of electrons generated from the filament 7. on the other hand,
If the electric potentials of the first and second control grids 8 and 9 are both negative with respect to the filament 7, the electric field near the filament 7 becomes a negative electric field and the electrons generated from the filament 7 are affected by the negative electric field. The divergence is suppressed by. That is, the phosphor does not emit light. Further, the potential of either the first or second control grid 8 or 9 is the filament 7
Is negative, the electric field in the vicinity of the filament 7 becomes a negative electric field under the influence of one of the negative potential control grids, and the electrons generated from the filament 7 are suppressed from diverging due to the negative electric field. . Here, the ends of the first and second control grids 8 and 9 mesh with each other in a corrugated manner, but by forming and arranging in this way, both control grids 8 and 9 give to the filament 7. Both influences of the electric field distribution can be increased. In addition, in the said Example, what printed the 1st, 2nd control grid 8 and 9 was demonstrated, but even if only these grids 8 and 9 are interposing | attached on the back surface of the filament 6, seismic resistance can be improved. it can. In the above embodiment, the phosphor 1 serving as the display pixel is 4 ×.
The four-matrix structure has been described, but FIG.
Needless to say, even if the number of display pixels is increased as shown in FIG. Even if the number of pixels is increased, since the first and second control grids 8 and 9 are formed by printing, it is possible to deal with these fine structures. Further, a drive control circuit composed of IC parts can be mounted on the glass substrate 6.

【The invention's effect】

As described above, according to the present invention, the accelerating electrode is provided between the filament and the anode laid on the substrate, the electrons generated from the filament are accelerated to collide with the phosphor, and the back surface of the filament is Since the first and second control electrodes are provided and the electric field of the filament portion is controlled by the relation of the potentials applied to each to control the generation of electrons from the filament, the first and second control electrodes are By providing it on the back surface of the filament, it is possible to improve the earthquake resistance and to simplify the internal structure. Further, the accelerating electrode can shield the influence of the anode electric field on the first and second control electrodes, and can improve the directivity of the electrons generated from the filament, which is reliable for the control operation of the accelerating electrons. There is an effect that can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a display device according to the present invention, FIG. 2 is an assembly view thereof, and FIGS. 3 and 4 show other embodiments corresponding to FIG. 6 and 6 are views showing a conventional device, FIG. 5 is a sectional view thereof, and FIG. 6 is a view corresponding to FIG. In the figure, 1 is a phosphor, 6 is a glass substrate (substrate), 8,
Reference numeral 9 denotes first and second control grids (first and second control electrodes). In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. An anode having a plurality of phosphors deposited thereon, a filament which is laid over a substrate and which generates electrons for causing each of the phosphors of the anode to emit light, and a filament disposed between the filament and the anode. The accelerating electrode for accelerating the electrons generated from the filament to collide with the phosphor and the back surface of the filament erected on the substrate are provided at positions corresponding to the phosphor, respectively, and applied to each. A display device comprising: a first and a second control electrode for controlling an electric field of the filament portion according to a potential relationship, and controlling electrons generated from the filament to a corresponding phosphor. 2. An anode in which phosphors are adhered in a matrix, a filament that is laid over a substrate and generates electrons that cause the phosphors of the anode to emit light, and an opening is provided corresponding to the phosphors. Along with being disposed between the filament and the anode, an acceleration electrode for accelerating the electrons generated from the filament to collide with the phosphor, and provided on the back surface of the filament laid on the substrate, respectively. A display device comprising first and second control electrodes for controlling an electric field of the filament portion according to a potential relationship applied to the filament and controlling generation of electrons from the filament. 3. The first and second control electrodes are formed by printing on a substrate.
The display device according to item 2 or item 2. 4. The display device according to claim 1 or 2, wherein the first and second control electrodes are arranged adjacent to each other so that their ends engage with each other.