JPH07262941A - Flat display apparatus - Google Patents

Abstract

PURPOSE:To save electric power energy by controlling an electric field in an electron source in the way electrons are emitted only out of positions of a flat electron source facing to electron beam passing positions. CONSTITUTION:ON-voltage is applied to a divided back side electrode 16a from a divided back side electrode driving apparatus 17 and potential at which no electron is emitted out of a linear thermal cathode 1 is applied to other divided back side electrodes 16b-16i. Consequently, electrons 19 are emitted only out of a part of the electrode 16a through a small hole of a hole-having cover electrode 2. When ON-voltage is applied to only one of successively corresponding electrodes 16a-16i from the driving apparatus 17 while being timed to the scanning work to set a group of control electrodes at ON-potential, electrons 19 can be emitted only out of the electrode. As a result, electrons 19 are emitted only out of a part facing to the scanned position of the group of control electrodes of a flat electron source 4a, vain electron emission is suppressed and electric power is saved. Moreover, the electrodes 16a-16i are easily formed on an insulating film 21 after the insulating film 2 is formed on the face of a metal substrate 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device using an electron beam emitted from a flat electron source.

[0002]

2. Description of the Related Art FIG. 25 shows, for example, JP-A-3-226949.
FIG. 26 is a partially enlarged cutaway perspective view of a conventional flat-panel display device disclosed in Japanese Patent Laid-Open No. 3-245445 and FIG. In FIG. 25, reference numeral 1 is a direct heating type linear cathode (hereinafter, referred to as “linear heating cathode”), which is arranged in parallel in a plurality of rows in a column (vertical) direction and supported by a support (not shown), and electrically heated. Is emitted and emits electrons. Reference numeral 2 denotes a perforated cover electrode having a semi-elliptical cross section for separately covering the upper surface of each of the linear hot cathodes 1 and having a large number of small holes for passing electrons, and an appropriate potential should be applied. The electrons are extracted from the linear hot cathode 1. Reference numeral 3 denotes a back electrode having a semi-elliptical cross section for separately covering the lower surface of the linear hot cathode 1, and a potential different from that of the perforated cover electrode 2 is applied. These linear hot cathodes 1, the perforated cover electrode 2, and the back electrode 3 constitute linear electron sources 4a, 4b ... And these linear electron sources 4a, 4b. The planar electron sources 4 are arranged in parallel at intervals of.

In FIG. 26, reference numeral 5 denotes a second grid, which in this example is made of stainless steel and has a large aperture ratio.
Square holes with a side of 1.8 mm are formed at a pitch of 2 mm. Reference numeral 6 denotes a front glass, which constitutes a part of the hermetically sealed container 7, and the inner surface of which has a phosphor screen 8 on which pixels coated with dots of three kinds of phosphors that emit red, green, and blue are arranged.
And an aluminum film (not shown) for providing conductivity is formed on the surface.

Reference numeral 9 denotes a control electrode portion, which is a substrate whose surface on which the electron passage holes 10 facing each pixel of the phosphor screen 8 are formed is insulative, for example, an insulating substrate 11 made of glass, and the insulating substrate 11. A first control including a plurality of strip-shaped control electrodes 13a formed of, for example, a nickel film, which are arranged on the side of the planar electron source 4 so as to face one row of pixels and are insulated from each other by a separation band 12. Similarly to the electrode group 13, a plurality of strip-shaped strips made of, for example, a nickel film are arranged so as to face each other in a row of pixels on the phosphor screen 8 side of the insulating substrate 11 and are insulated from each other by the separation band 14. The second control electrode group 15 is composed of the control electrodes 15a.

In the sealed container 7, each electrode is arranged in the order of the planar electron source 4, the second grid 5, the control electrode portion 9 and the fluorescent screen 8 and is kept in vacuum, and each electrode is a side surface. A flat display device is configured by being electrically connected to the outside from a sealing portion (not shown) provided in the.

Next, the operation of the conventional example will be described. The thermoelectrons emitted from the linear hot cathode 1 are emitted from the planar electron source 4 by the perforated cover electrode 2 to which an electric potential of about 5 to 40 V is applied, when the average electric potential of the linear hot cathode 1 is 0V. Then, the second grid 5 to which a potential of about 30 to 350 V is applied is shaped into a uniform electron flow directed to the fluorescent substance and sent to the front surface of the control electrode unit 9. This thermoelectron is about 20 to about the first control electrode group 13.
The positive potential of 100 V is attracted to the single control electrode 13a and reaches the control electrode unit 9. At this time, any one control electrode 13a of the first control electrodes 13
So that the electron current density on the front surface of the
Elliptic cylinder shape of perforated cover electrode 2, first control electrode group 13
And the voltage applied to each control electrode 13a are adjusted.

Next, the operation of the control electrode section 9 will be described. As described above, when only one control electrode 13a of the first control electrode group 13 has a positive potential (ON state) and the other control electrodes 13a have 0V or a negative potential (OFF state), the line The thermoelectrons emitted from the hot cathode 1 are attracted only to this one control electrode 13a in the ON state,
The electrons pass through the row of electron passage holes 10 provided in the control electrode 13a. All of the electrons that have entered the electron passage hole 10 do not pass through to the front glass 6 side as they are, but for example, 40 to 40
Control electrode 1 in the ON state to which a potential of 100 V is applied
Only the electron passage hole 10 of the control electrode 15a in the OFF state, which passes through the electron passage hole 5a of 5a and is at 0 V or a negative potential, cannot pass. Therefore, the electron is the first
One control electrode 1 in the ON state of the control electrode group 13
3a and only the electron passage hole 10 at the intersection of the control electrode 15a in the ON state of the second control electrode group 15 can be passed.

Then, the passing electrons are accelerated by a potential of about 10 to 30 kV applied to the aluminum film formed on the phosphor screen 8, and on the phosphor screen 8 corresponding to the electron passing hole 10 at the intersection. The pixel at the position is excited to emit light. That is, the control electrode 13a of the first control electrode group 13
Is sequentially scanned one by one to be in an ON state, and a scan in which the control electrode 15a of the second control electrode group 15 corresponding to the position of a pixel which is synchronized with the scanning is turned on is performed.
A cycle that is not felt by the human eye, for example 60 per second
An image is displayed by repeating pixels.

The control electrodes 13a and 15a are configured to cover a part of the inner surface of the electron passage hole 10 by applying a small negative potential of 0V to several tens of volts to the control electrodes 13a and 15a to turn them off. This is because at this time, an electric field is effectively applied to the electrons that have entered the electron passage hole 10 to block passage of the electrons.

Further, the adjustment of the luminance of the light-emitted pixel is controlled by the time during which the control electrode 15a is turned on. That is, assuming that the on-state time of the control electrode 13 is ty, the on-state time tx of the control electrode 15a is controlled to tx = ty · P / 100 in order to make the pixel at the predetermined position have P% luminance.

[0011]

In the conventional flat-panel display device having the above-described structure, the line electrodes are controlled by scanning the control electrodes of the first control electrode group one by one to turn them on. Electrons are constantly emitted from the hot cathode in the entire area, and there is a problem in that power consumption is wasted.

Further, a potential gradient occurs in the linear hot cathode due to the voltage drop due to the heating current. For this reason, the potential changes depending on the position of the linear hot cathode, and the amount of extracted electrons changes depending on the position of the linear hot cathode, which causes a problem that brightness on the screen and brightness flatness change. .

Further, when the screen size becomes large and the front glass and the control electrode portion are curved, the distance between the electron source and the control electrode portion varies depending on the place. Therefore, there are problems that the amount of electron current reaching the phosphor screen is different, the brightness becomes non-uniform, and the electron utilization rate decreases.

The present invention has been made to solve the above problems, and an object thereof is to obtain a flat-panel display device capable of saving power.

Another object of the present invention is to obtain a flat display device in which the brightness and the flatness of the brightness on the screen are not changed by the potential gradient generated in the linear hot cathode.

Another object of the present invention is to provide a flat panel display having a large screen size in which the front glass of the closed container and the control electrode portion are curved, and the flat panel display has a uniform brightness and a small decrease in brightness. .

[0017]

A flat-panel display device according to the present invention includes a hermetically sealed container kept in a vacuum, linear cathodes arranged on one surface in the hermetically sealed container, and back surfaces of these linear cathodes. A planar electron source in which a plurality of linear electron sources composed of a back electrode for covering the linear cathode and a perforated cover electrode for covering the front surface of these linear cathodes are arranged, and fluorescent light formed on the other surface of the sealed container. Surface, a control electrode portion which is arranged between the electron source and the electron source so as to face the fluorescent surface and regulates the horizontal and vertical positions of the electron beam to pass therethrough, and a plane which faces the electron beam passage position by the control electrode portion. Means for controlling the electric field in the planar electron source so that electrons are emitted only from the position of the planar electron source.

Further, the back electrode is divided into a predetermined number of control electrodes constituting the control electrode portion, and a potential (hereinafter, referred to as a potential for extracting electrons from the linear cathode to the divided back electrode is divided into the divided back electrodes).
It is provided with a split back electrode drive means for applying "on-potential" according to the scanning positions in the horizontal and vertical directions by the control electrode portion.

Further, the split back electrode is constituted by a metal substrate, an insulating film formed on the metal substrate, and a split electrode made of a conductor formed on the insulating film.

Further, there is provided a divided back electrode variable potential driving means for applying an ON potential having a constant potential difference between the divided back electrode to which the ON potential is applied and the linear hot cathode at a position facing the divided back electrode. It is a thing.

Further, there is provided a linear hot cathode variable potential applying means for applying a potential having a constant potential difference between the split back electrode to which the ON potential is applied and the linear hot cathode at a position facing the split back electrode. It is a thing.

Further, the perforated cover electrode is divided for each predetermined control electrode constituting the control electrode portion, and the ON potential for drawing electrons from the linear cathode to the divided back electrode is set by the control electrode portion. It is provided with a divided perforated cover electrode driving means for applying in accordance with scanning positions in the horizontal and vertical directions.

Further, the divided perforated cover electrode applying the on-potential so that the potential difference between the divided perforated cover electrode to which the on-potential is applied and the linear hot cathode at a position facing the divided perforated cover electrode becomes a constant value. It is provided with a variable potential driving means.

Further, a linear hot cathode variable potential for applying a potential such that the potential difference between the divided perforated cover electrode to which the ON potential is applied and the linear hot cathode at a position facing the divided perforated cover electrode is constant. It is provided with an application means.

A means for driving a plurality of linear electron sources arranged for each of a predetermined number of control electrodes into an ON state for sequentially emitting electrons in accordance with the scanning positions in the horizontal and vertical directions by the control electrode section is provided. Be prepared.

Further, the electron emission is performed from two or more split back electrodes including the positions facing the scanning positions in the horizontal and vertical directions by the control electrode section, the split perforated cover electrodes, or the linear electron source. It is provided with a means for controlling.

Further, the scanning positions in the horizontal and vertical directions by the control electrode portion are scanned between the linear electron source regions or the boundary regions of the divided portions of the linear electron source in which the disturbance of the electron beam affecting the image occurs. For a certain period of time, a means for controlling the electron emission from two or more divided portions including the region or two or more linear electron sources is provided.

Further, a flat electron source provided on one surface of the hermetically sealed container kept under vacuum, a fluorescent screen formed on the other curved surface of the hermetically sealed container, and facing the fluorescent screen. And a control electrode portion formed on the same curved surface as the fluorescent screen for regulating the horizontal and vertical positions of the electron beam that is disposed between the control electrode portion and the planar electron source. An electron passage hole is provided between the control electrode portion and the planar electron source, the electron passage hole being provided between the control electrode portion and the planar electron source for correcting the variation in the current amount of the electron beam on the fluorescent screen. And an electron beam amount correcting electrode which is provided.

Further, the electron beam amount correction electrode arranged between the control electrode portion and the electron source is formed with a radius of curvature different from that of the control electrode portion.

Further, the first and second electron beam amount correcting electrodes are provided between the control electrode portion and the electron source, and
The first electron beam amount correcting electrode near the control electrode portion has a radius of curvature equal to or larger than that of the control electrode portion, and the second electron beam amount correcting electrode near the electron source has the first electron beam. The radius of curvature is larger than that of the quantity correction electrode.

Further, the second electron beam amount correcting electrode is formed on a plane.

Further, the first electron beam amount correction electrode formed on the curved surface and the second electron beam amount correction electrode formed on the flat surface are overlapped at the peripheral edge portion.

Further, the second electron is formed to have a radius of curvature larger than that of the first electron beam amount correction electrode or to be flat and to cover only a portion where the distance between the electron source and the control electrode is large. A beam amount correction electrode is provided.

[0034]

In the flat-panel display device having the above-described structure, electrons can be emitted only from the necessary portion in accordance with the scanning operation of the control electrode.

Further, according to the present invention, the potential of the divided back electrode is changed in accordance with the scanning operation of the control electrode to control the on / off of the electron emission, and the electron can be emitted only from a necessary portion. .

Further, since the split back electrode is composed of the metal substrate, the insulating film formed on the metal substrate, and the split electrode made of a conductor formed on the insulating film, the split back electrode is easily manufactured. it can.

Further, the divided back electrode variable potential driving means makes the difference between the divided back electrode to which the ON potential is applied and the electric potential of the linear hot cathode facing the divided back electrode constant. Since different ON potentials are sequentially applied to the divided back electrodes, the influence of the voltage drop due to the heating current of the linear hot cathode is suppressed, and the amount of electron current drawn by the perforated cover electrode becomes equal.

Also, the linear hot cathode variable potential applying means applies a constant value to the difference between the potential of the split back electrode to which the ON potential is applied and the potential of the linear hot cathode at a position facing the split back electrode. Since different potentials are sequentially applied to the linear hot cathode, the influence of the voltage drop due to the heating current of the linear hot cathode is suppressed, so that the amount of electron current drawn by the perforated cover electrode becomes equal.

Further, since the divided perforated cover electrode driving means applies the ON potential to the divided back electrode in accordance with the scanning positions in the horizontal and vertical directions by the control electrode portion, a necessary portion corresponding to the scanning operation of the control electrode is formed. Electrons can be emitted only from.

Further, the divided perforated cover electrode variable potential driving means controls the difference between the divided perforated cover electrode and the potential of the linear hot cathode at a position facing the divided perforated cover electrode to a constant value. Since different ON potentials are sequentially applied to the divided perforated cover electrodes, the influence of the voltage drop due to the heating current of the linear hot cathode is eliminated, and the electron current amounts drawn by the perforated cover electrodes become equal.

Further, by the linear hot cathode potential applying device,
Different potentials are sequentially applied to the linear hot cathode so that the potential difference between the split perforated cover electrode to which the ON potential is applied and the linear hot cathode at a position facing the split perforated cover electrode becomes a constant value. The influence of the voltage drop due to the heating current of the linear hot cathode is eliminated, and the amount of electron current drawn by the perforated cover electrode becomes equal.

Further, the means for driving the linear electron source into the on state sequentially turns on in accordance with the scanning positions in the horizontal and vertical directions by the control electrode portion, so that a portion required according to the scanning operation of the control electrode is performed. Can emit electrons from.

Further, the electron emission is performed from two or more split back electrodes including the positions facing the scanning positions in the horizontal and vertical directions by the control electrode portion, the split perforated cover electrodes, or the linear electron source. Since the control means is provided, the image disturbance due to the turbulence of the beam at the division boundary does not occur.

Further, the scanning position in the horizontal and vertical directions by the control electrode portion scans between the linear electron sources or the boundary region of the divided portions of the linear electron source in which the disturbance of the electron beam affecting the image occurs. Since there is provided means for controlling so that electrons are emitted from two or more divided portions including the relevant region or two or more linear electron sources only during a certain period, the image due to the disturbance of the beam at the dividing boundary is displayed. The effect of does not occur.

Further, a flat electron source provided on one surface of the sealed container kept in vacuum, a fluorescent screen formed on the other curved surface of the sealed container, and facing the fluorescent screen. And a control electrode portion formed on the same curved surface as the fluorescent screen for regulating the horizontal and vertical positions of the electron beam that is disposed between the control electrode portion and the planar electron source. An electron passage hole is provided between the control electrode portion and the planar electron source, the electron passage hole being provided between the control electrode portion and the planar electron source for correcting the variation in the current amount of the electron beam on the fluorescent screen. Since the electron beam amount correcting electrode is provided, variations in the electron current amount on the fluorescent screen due to the difference in distance between the control electrode group and the planar electron source are reduced.

Further, since the electron beam amount correction electrode arranged between the control electrode portion and the electron source is formed with a radius of curvature different from that of the control electrode portion, the distance between the electron source and the control electrode is increased. The difference in the amount of electron current on the phosphor screen due to the difference between the two becomes small.

Further, the first and second electron beam amount correction electrodes are arranged between the control electrode portion and the electron source, and the first electron beam amount correction electrode near the control electrode portion is the above-mentioned. With a radius of curvature equal to or greater than the control electrode section,
Since the second electron beam amount correction electrode near the electron source is formed to have a larger radius of curvature than the first electron beam amount correction electrode, electrons on the fluorescent screen due to the difference in the distance between the electron source and the control electrode are formed. Variation in current amount is reduced.

Further, since the second electron beam amount correction electrode is formed on the plane, the variation of the electron current amount on the fluorescent screen due to the difference in the distance between the electron source and the control electrode is reduced.

Further, since the first electron beam amount correction electrode formed on the curved surface and the second electron beam amount correction electrode formed on the flat surface are overlapped at the peripheral portion, the electron source and the control electrode are The variation in the amount of electron current on the phosphor screen due to the difference in the distance is reduced.

A second electron beam formed to have a radius of curvature larger than that of the first electron beam amount correction electrode or to a flat surface and to cover only a portion where the distance between the electron source and the control electrode is large. Since the quantity correction electrode is provided, variations in the quantity of electron current on the phosphor screen due to the difference in the distance between the electron source and the control electrode are reduced.

[0051]

【Example】

Example 1. 1 is a perspective view showing one linear electron source 4a of a flat panel display according to Embodiment 1 of the present invention, and the same reference numerals as those in FIGS. 25 and 26 denote the same parts. In the figure, 16 is a divided back electrode group, and in this embodiment, 10 control electrodes 13a of the first control electrode group 13 are provided.
The divided back electrodes 16a divided so as to face each other.
16i, and the divided back electrode 16a is No1.
To the control electrode 13a of No. 10 and the divided back electrode 1
6b faces the control electrodes 13a of No11 to No20,
Hereinafter, each of the divided back electrodes 16i faces the ten control electrodes 13a. Reference numeral 17 is a split back electrode driving device, and 18 is a power source for heating. Here, in order to simplify the description, a DC heating current is applied to the linear hot cathode 1. Reference numeral 19 is an electron emitted from the linear electron source 4a,
When an on-potential is applied to the perforated cover electrode 2, it is emitted through the perforated cover electrode 2.

FIG. 2 is a timing chart showing a driving method of the flat panel display device having the flat electron source 4 configured as described above. The first control electrode group 13 and the split rear surface electrode group 16 are shown.
3 shows the timing of the ON potential applied to the divided rear electrode driving device 17 so that electrons are emitted only from the divided portions necessary for display in accordance with the scanning operation of the first control electrode group 13. The ON potential is applied to the divided back electrodes 16a to 16i.

Next, the operation of the first embodiment will be described. Now
An on-potential is applied from the split back electrode driving device 17 to the split back electrode 16a, and a potential (hereinafter, referred to as "off potential") that does not emit electrons from the linear hot cathode 1 is applied to the other split back electrodes 16b to 16i. Then, as shown in FIG. 1, electrons 19 are emitted only from the divided back electrode 16a through the small holes of the perforated cover electrode 2.

As shown in the timing chart of FIG. 2, only the split back electrode 16a is turned on and the split back electrode 16a is turned on in accordance with the timing of the scanning operation for applying the on potential to the first control electrode group 13. When the on-potential is sequentially applied to the corresponding divided back electrodes such that only the back electrode 16b has the on-potential, the electrons 19 are emitted only from the divided back electrode portions to which the on-potential is applied.

According to the first embodiment, electrons can be emitted only from the portion of the planar electron source 4 facing the scanning position of the first control electrode group 13, so that useless electron emission can be suppressed. The power consumption can be reduced.

FIG. 3 is a cross-sectional view showing one structural example of the divided back electrode group 16 of the first embodiment. An insulating film 21 is formed on the surface of the metal substrate 20, and the divided back electrode is formed on the insulating film 21. 16
a to 16i are formed by a method such as vapor deposition.

According to this configuration example, the divided back electrode group can be easily manufactured.

Example 2. FIG. 4 is a timing chart showing a driving method according to the second embodiment of the present invention. The second embodiment is intended to eliminate the influence of the voltage drop caused by the heating current in the linear hot cathode 1, and the configuration of the linear electron source 4a is the same as that in FIG.

That is, the value of the ON potential applied from the split back electrode driving device 17 to the split back electrode 16a is a (V).
Then, a potential b (V) higher than a (V) by a voltage drop between the divided back electrodes 16a to 16b of the linear hot cathode 1 is applied to the adjacent divided back electrode 16b, and the adjacent divided back electrode 16b is applied. Higher potentials are sequentially applied to the back electrode 16c such that a potential c (V) higher than b (V) by a voltage drop between the split back electrodes 16b to 16c of the linear hot cathode 1 is applied. .

By doing so, the influence of the voltage drop due to the heating current of the linear hot cathode 1 is eliminated, and the portion between the linear hot cathode 1 and the perforated cover electrode 2 facing the split rear electrode in the ON state is eliminated. Since the electric field strength is substantially uniform over the entire length of the linear hot cathode 1, the amount of electron current drawn by the perforated cover electrode 2 from each part of the divided back electrodes 16a to 16i is substantially uniform.

According to the second embodiment, power can be saved as in the first embodiment, and the brightness and the brightness flatness on the screen can be improved.

Example 3. FIG. 5 is a diagram showing a drive circuit according to a third embodiment of the present invention. The structure of the linear electron source 4a is the same as that of FIG. 1, and 22 is a linear hot cathode variable potential applying device.
FIG. 6 is a timing chart showing a driving method according to the third embodiment of the present invention.

In the third embodiment, the influence of the voltage drop caused by the heating current on the linear hot cathode 1 is eliminated, and the split back electrode driving device 17 to the split back electrodes 16a to 16 are used.
When the potential of the linear hot cathode 1 is changed in synchronization with the ON potential applied to i, the potential difference between the split back electrode to which the ON potential is applied and the linear hot cathode 1 at a position facing the split rear electrode is the same. It was made to become.

Next, the operation of the third embodiment will be described. Now
In the same manner as in Example 1, the divided back electrode driving device 17 applies the same ON / OFF potential to the divided back electrode group 16, and the divided back electrode driving device 17 causes the divided back electrode 16 to be applied.
When the ON potential is applied to a, the potential of a (V) is applied to the linear hot cathode 1 from the linear hot cathode variable potential applying device 22.
When an ON potential is applied to the adjacent divided back electrode 16b, a potential of b (V) lower than that of a (V) by the voltage drop of the linear hot cathode 1 is applied to the linear hot cathode 1 and the adjacent When an ON potential is applied to the split back electrode 16c, the linear hot cathode 1 is lower than b (V) by a voltage drop of the linear hot cathode 1 c.
By applying the potential of (V), the split back electrode 16
The driving is performed so that the potential difference between a to 16i and the linear hot cathode 1 is the same in any divided portion.

According to the driving method of the third embodiment, the electric field strength between the linear hot cathode 1 and the perforated cover electrode 2 in the split rear electrode portion in the ON state becomes substantially uniform over the entire length of the linear hot cathode 1. Since the amount of electron current drawn from the divided back electrodes 16a to 16i by the perforated cover electrode 2 becomes substantially uniform, the brightness and brightness flatness on the screen are improved, and power saving can be achieved.

Example 4. 7 is a diagram showing a drive circuit according to a fourth embodiment of the present invention, and the same reference numerals as those in FIG. 1 denote the same parts. In the figure, reference numeral 23 denotes a divided perforated cover electrode group, which is the 10 control electrodes 13 of the first control electrode group 13.
Each of the divided perforated cover electrodes 23a to 23i is divided so as to face each other, and the divided perforated cover electrodes 23a face the control electrodes 13a of No1 to No10,
The divided perforated cover electrode 23b faces the control electrodes 13a of No11 to No22, and hereinafter, each divided perforated cover electrode 23
Up to i, they face 10 control electrodes 13a, respectively. Reference numeral 24 denotes a divided perforated cover electrode driving device.

FIG. 8 is a timing chart showing a driving method of the flat panel display device having the electron source constructed as described above.
First control electrode group 13 and divided perforated cover electrodes 23a-2
3 shows the timing of the ON potential applied to 3i,
In accordance with the scanning operation of the first control electrode group 13, the divided perforated cover electrode driving device 24 is turned on so that the electrons are emitted only from the portions of the divided perforated cover electrodes 23a to 23i necessary for display. An electric potential is applied.

Next, the operation of the fourth embodiment will be described. Figure 8
As shown in FIG. 5, the divided perforated cover electrode driving device 24 applies the on potential to only the divided perforated cover electrodes 23a at the timing of the scanning operation for applying the on potential to the first control electrode group 13, and other Split perforated cover electrodes 23b-23
When an off-potential is applied to i, as shown in FIG. 7, electrons 19 are emitted only from the portion of the divided perforated cover electrode 23a through the small holes of the divided perforated cover electrode 23a. Therefore, as shown in FIG. 8, the divided perforated cover electrodes 23a are turned on and the divided perforated cover electrodes 23b are turned on in accordance with the scanning operation timing of the first control electrode group 13. By sequentially applying the ON potential from the cover electrode driving device 24, electrons can be emitted only from the portion of the planar electron source 4 facing the scanning position of the first control electrode group 13.

According to the fourth embodiment, the electrons can be emitted only from the portion of the planar electron source 4 facing the scanning position of the first control electrode group 13, so that the useless electrons are emitted as in the first embodiment. The emission can be suppressed and the power consumption can be saved.

Example 5. FIG. 9 is a diagram showing a drive circuit according to a fifth embodiment of the present invention, in which the same reference numerals as those in FIG. 7 denote the same parts, 25 is a divided perforated cover electrode variable potential drive device, and FIG. 10 is this embodiment. 5 is a timing chart showing a driving method of No. 5, in which the fifth embodiment is intended to eliminate the influence of the voltage drop due to the heating current of the linear hot cathode 1 as in the second embodiment.

That is, the value of the ON potential applied from the divided perforated cover electrode variable potential driving device 25 to the divided perforated cover electrodes 23a to 23i is set to the electric potential of the linear hot cathode 1 facing each divided perforated cover electrode. The divided back electrodes to which the ON potential is applied are made to have the same potential difference between the linear hot cathodes 1 at the positions facing the divided back electrodes.

Next, the operation of the fifth embodiment will be described. Now
It is assumed that the voltage drop across the linear hot cathode 1 is A and the number of divisions of the divided perforated cover electrode group 23 is N, and the divided perforated cover electrode variable potential drive device 25 is divided into the divided perforated cover electrode 23a.
If the value of the on-potential applied to V is V (V),
Next to the divided perforated cover electrode 23b, V + A / N
(V) ON-potential, next to the divided perforated cover electrode 23c
The ON potential of V + 2 A / N (V) is shown in FIG.
At the timing indicated by 0, the on-potential that gradually increases by the voltage drop is applied.

According to the driving method of Example 5, the electric field strength between the linear hot cathode 1 and the divided perforated cover electrode in the ON state is substantially equal over the entire length of the linear hot cathode 1. As in the case of 2, the brightness and the brightness flatness on the screen are improved, and the effect of saving power can be obtained.

Example 6. FIG. 11 is a diagram showing a drive circuit according to a sixth embodiment of the present invention. The same reference numerals as those in FIGS. 5 and 7 denote the same parts. FIG. 12 is a timing chart showing the driving method of the sixth embodiment.
Similarly to the above, the influence of the voltage drop due to the heating current of the linear hot cathode 1 is eliminated.

Next, the operation of the sixth embodiment will be described. Figure 1
As shown in FIG. 2, when the ON potential is applied from the divided perforated cover electrode driving device 24 to the divided perforated cover electrode 23a, the linear hot cathode variable potential applying devices 22 to a are applied to the linear hot cathode 1.
The potential of (V) is applied, and the divided perforated cover electrode 2 next to it
When an on-potential is applied to 3b, a is applied to the linear hot cathode 1.
B (V) lower than (V) by the voltage drop of the linear hot cathode 1
When an ON potential is applied to the divided perforated cover electrode 23c adjacent thereto, the linear hot cathode 1 has a voltage of c (V) lower than b (V) by a voltage drop of the linear hot cathode 1. Apply a potential.

According to the driving method of the sixth embodiment, the split perforated cover electrodes 23a-23i in the ON state and the linear hot cathode 1 are arranged.
The electric field strength between the two is substantially uniform over the entire length of the linear hot cathode 1, and the amount of electron current drawn from each part of the divided perforated cover electrodes 23a to 23i is substantially uniform, so that the brightness and the brightness on the screen are flat. As a result, it is possible to obtain the effect of improving power consumption and saving power.

Example 7. 13 is a diagram showing a drive circuit according to a seventh embodiment of the present invention, and the same reference numerals as those in FIG. 1 denote the same parts. In the figure, 1a to 1i are linear cathodes,
Reference numerals 2a to 2i are cover electrodes, and linear cathodes 1a to 1i, cover electrodes 2a to 2i and back electrode 3 are linear electron sources 4a to 4i.
4i is formed to configure the planar electron source 4. Reference numeral 26 is a linear cathode on-potential applying device which is an example of a means for driving the linear electron sources 4a to 4i to the ON state.

FIG. 14 is a timing chart showing the driving method of the seventh embodiment, in which the first control electrode group 13 and the linear cathodes 1a.about.
It shows the timing of the ON potential applied to 1i,
In accordance with the scanning operation of the first control electrode group 13, the linear cathode on-potential applying device 26 applies the on-potential only to the linear cathode required for display.

That is, for example, only the linear cathode 1a is turned on and the linear cathode 1b is turned on so that electrons are emitted only from a necessary portion according to the scanning operation of the first control electrode group 13.
The on-potential is applied to the linear cathodes 1a to 1i so that only the on-potential has the on-potential.

According to the driving method of the seventh embodiment, only the portion of the planar electron source 4 facing the control electrode 13a in the ON state in the first control electrode group 13 is in the ON state. Similar to the first embodiment, the effect of saving power can be obtained.

Example 8. In the seventh embodiment, the linear cathodes 1a to 1i are applied with an ON potential to supply the linear electron sources 4a to 4i.
Although i is controlled to be turned on and off for each one, the electric potential applied to the perforated cover electrode is changed so that the linear electron sources 4a to 4i are turned on and off for each one, as is clear from the above-mentioned operation principle. The same effect can be obtained as a driving method.

Example 9. Further, as is apparent from the above-mentioned operation principle, the same effect can be obtained as a driving method in which the electric potentials applied to the back electrodes 3a to 3i are changed to turn on and off the linear electron sources 4a to 4i one by one. To be

Example 10. In the first to ninth embodiments, one divided back surface electrode 16a to 16i or one divided perforated cover electrode 2a to 2i is divided in each divided portion in accordance with the scanning operation of the first control electrode group 13, or a linear electron. Source 4a
I tried to turn on and off each ~ 4i,
You may control so that two or more division parts or two or more linear electron sources may be turned on one by one. FIG. 15 shows a state in which an ON potential is applied to the two split back electrodes 16a and 16b, and FIG. 16 shows two split perforated cover electrodes 2a.
.About.2b are applied with the ON potential, and FIG. 17 shows the case where the ON potentials are applied to the two linear cathodes 1a and 1b and the linear electron sources 4a to 4i are turned on. .

FIG. 18 is a timing chart of the driving method of the tenth embodiment, which shows the timing of the potential applied to the first control electrode group 13, the divided back electrode 16, the divided perforated cover electrode group 23,
And the timing of the applied potential to the linear hot cathode group 1 are shown, and the ON potential is applied so that the two divided portions are always in the ON state.

According to the driving method of Example 10, the influence on the image due to the disturbance of the electron beam at the dividing boundary of the divided back electrode 16, the divided perforated cover electrode group 23, and the linear hot cathode group 1 can be reduced. At the same time, it is possible to save power.

Example 11. In the tenth embodiment, the on-potential is applied so that two or more divided parts are always in the on state. However, in the eleventh embodiment, as shown in the timing chart of FIG. 19, the first control electrode group 13 is , The split back electrode 16, the split perforated cover electrode group 23, and the linear hot cathode group 1 affect the image by the disturbance of the electron beam. The same effect as that of the tenth embodiment can be obtained by the driving method in which the overlapping period is provided so as to be in the ON state and the ON potential is applied.

Example 12 FIG. 20 shows the first embodiment of the present invention.
2 is a cross-sectional view showing the configuration of the flat-panel display device, in which the same reference numerals as those in FIG. 1 denote the same parts, and 27 is a conventional front glass 6 which is curved with a radius of curvature RM. Is a conventional control electrode portion 9 which is curved with the same radius of curvature RM as the front glass 6. Further, reference numeral 29 is an electron beam amount correction electrode having an electron passage hole provided between the planar electron source 4 and the control electrode portion 28.
7 and the control electrode portion 28 are formed to have a radius of curvature R1 different from that of the control electrode portion 28.

Next, the operation of the twelfth embodiment will be described. When the distance between the electron beam amount correction electrode 29 and the control electrode unit 28 is long, the influence of space charge is remarkable between the electron beam amount correction electrode 29 and the control electrode unit 28 in the cross section perpendicular to the linear hot cathode 1. Then, the electrons diverge and the passage efficiency of the control electrode portion 28 decreases, and in the cross section parallel to the linear hot cathode 1, the off-potential of the control electrode portion 28 becomes dominant, and the electrons become the control electrode portion 28.
Does not reach In addition, when the distance between the electron beam amount correction electrode 29 and the control electrode portion 28 becomes short, the influence of space charge between the perforated cover electrode 2 and the electron beam amount correction electrode 29 is affected in the cross section perpendicular to the linear hot cathode 1. It becomes noticeable, the electrons diverge, and the converging effect in the vicinity of the electron passage hole 10 becomes small in the cross section parallel to the linear hot cathode 1. That is, there are optimum positions for installing the electron beam amount correction electrodes 29 in the cross section perpendicular to the linear hot cathode 1 and the cross section parallel to the linear hot cathode 1.

According to the twelfth embodiment, the electron beam amount correcting electrode 29 is placed at the optimum position in consideration of both vertical and parallel cross sections.
Can be installed, and the difference in the amount of electron current on the phosphor screen 8 due to the difference in the distance between the planar electron source 4 and the control electrode portion 28 can be reduced, so that the brightness on the phosphor screen 8 becomes uneven. It is possible to obtain a flat-panel display device in which the brightness does not decrease.

Example 13 FIG. 21 shows the first embodiment of the present invention.
20 is a cross-sectional view showing the configuration of the flat-panel display device of FIG. 3, the same reference numerals as in FIG. 20 denote the same parts, and 30 denotes the control electrode section 2 installed between the planar electron source 4 and the control electrode section 28.
8 and the first electron beam amount correcting electrode 31 having an electron passage hole formed with the same radius of curvature as the front glass 27 or different radius of curvature R2, 31 has a different radius of curvature R3 from the first electron beam amount correcting electrode 30. The formed second electron beam amount correction electrode has a relationship of RM ≦ R2 <R3.

According to the thirteenth embodiment, one electrode is provided at an optimum position of a cross section perpendicular to the linear hot cathode 1 and an electrode is provided at an optimum position of a cross section parallel to the linear hot cathode 1 at an arbitrary position. Since it can be installed, the same effect as in the twelfth embodiment can be obtained.

Example 14 22 shows a first embodiment of the present invention.
FIG. 22 is a cross-sectional view showing the configuration of the flat panel display device of No. 4, in which the same reference numerals as those in FIG. 21 denote the same portions, and 32 denotes a second electron beam amount correction electrode formed on the plane.

According to the fourteenth embodiment, the same effect as that of the thirteenth embodiment can be obtained.

Example 15. FIG. 23 is a first embodiment of the present invention.
22 is a cross-sectional view showing the configuration of the flat-panel display device of FIG. 5, and the same reference numerals as those in FIG. 22 denote the same parts, respectively, and the first electron beam amount correction electrode 30 and the second electron beam amount correction formed on the plane surface. The electrode 31 and the electrode 31 are arranged so as to overlap each other at both ends of the screen.

In the thirteenth and fourteenth embodiments, two electrodes are installed between the planar electron source 4 and the control electrode section 28, and each electrode is installed at a certain distance at any place. There is. However, when the distance between the planar electron source 4 and the control electrode portion 28 is relatively short, the optimum positions on both cross sections perpendicular to and parallel to the linear hot cathode 1 may coincide. In this case, the fifteenth embodiment is the first embodiment.
3 and the same effects as those of Example 14 can be obtained.

Example 16. FIG. 24 shows the first embodiment of the present invention.
23 is a cross-sectional view showing the configuration of the flat-panel display device of No. 6, and the same reference numerals as those in FIG. 23 denote the same parts respectively, and a second electron beam formed on a plane in a part of the first electron beam amount correction electrode 30. The quantity correction electrodes 31 are arranged in a state of being overlapped at the peripheral portion, and the same effects as those of the thirteenth to fifteenth embodiments can be obtained.

In the above-mentioned Examples 13, 14 and 15, the first and second electron beam amount correcting electrodes 30, 32 were provided between the planar electron source 4 and the control electrode portion 28 in all ranges. Example 16 is a planar electron source 4 and a control electrode unit 2.
The first and second electron beam amount correction electrodes 30, 32 are arranged only in the range where the distance between the eight is relatively long, and only the first electron beam amount correction electrode 30 is arranged in the range where the distance is relatively short. With the arrangement, the same effects as those of the thirteenth to fifteenth embodiments can be obtained.

In each of the above embodiments, the direct heating type linear cathode is used, but the direct heating type is not limited, and an indirectly heating type linear cathode or a cold cathode may be used. Does not cause a potential gradient, it is not necessary to correct the potential of the linear cathode as in Examples 2, 3, 5 and 6.

[0099]

Since the present invention is constructed as described above, it has the following effects.

According to the flat panel display device of the present invention,
By controlling each of the back electrode, the perforated cover electrode, and the linear cathode to turn on / off the electron emission, it becomes possible to emit electrons only from a necessary portion in accordance with the scanning operation of the control electrode. , Electrons can be emitted only from a necessary portion in accordance with the scanning operation of the control electrode,
Power consumption can be reduced by suppressing unnecessary electron emission.

Further, since the electron emission can be controlled to be turned on and off by changing the potential of the back electrode divided according to the scanning operation of the control electrode so that the electrons can be emitted only from a necessary portion, the scanning of the control electrode is performed. It is possible to emit electrons only from a necessary portion in accordance with the operation, so that wasteful electron emission can be suppressed and power saving can be achieved.

Further, since the divided back electrode is composed of the metal substrate, the insulating film formed on the metal substrate, and the divided electrode made of a conductor formed on the insulating film, the divided back electrode is easily manufactured. Therefore, the cost can be reduced.

Further, the divided back electrode variable potential driving means causes the potential difference between the divided back electrode to which the ON potential is applied and the linear hot cathode at a position facing the divided back electrode to be a constant value. Since different on-potentials are applied to the electrodes sequentially, the effect of voltage drop due to the heating current of the linear hot cathode is suppressed, the amount of electron current drawn by the perforated cover electrode becomes equal, and eventually the brightness and brightness on the screen are flat. The degree improves.

The linear hot cathode variable potential applying means applies a constant potential to the potential difference between the split back electrode to which the ON potential is applied and the linear hot cathode at a position facing the split back electrode. Since different potentials are sequentially applied to the tubular hot cathode, the influence of the voltage drop due to the heating current of the linear hot cathode is suppressed, so the amount of electron current drawn by the perforated cover electrode becomes equal, and as a result, the brightness on the screen is increased. And the brightness flatness is improved.

Further, since the divided perforated cover electrode driving means applies the ON potential to the divided back electrodes in accordance with the scanning positions in the horizontal and vertical directions by the control electrode portion, a necessary portion corresponding to the scanning operation of the control electrodes can be obtained. Since it is possible to emit electrons only from, it is possible to save power.

Further, the divided perforated cover electrode variable potential drive means divides the divided perforated cover electrode so that the potential difference between the divided perforated cover electrode and the linear hot cathode at a position facing the divided perforated cover electrode becomes a constant value. Since different on-potentials are sequentially applied to the perforated cover electrode, the effect of voltage drop due to the heating current of the linear hot cathode is suppressed, the amount of electron current drawn by the perforated cover electrode becomes equal, and the brightness on the screen is also increased. And the brightness flatness is improved.

Further, the potential difference between the divided perforated cover electrode to which the ON potential is applied by the linear hot cathode variable potential applying means and the linear hot cathode at a position facing the divided perforated cover electrode becomes a constant value. Since different potentials are sequentially applied to the linear hot cathode as described above, the influence of the voltage drop due to the heating current of the linear hot cathode is suppressed, the amount of electron current that can be drawn out by the perforated cover electrode becomes equal, and by extension, on the screen. The brightness and brightness flatness are improved.

Further, since the linear electron source is driven to the ON state in which electrons are sequentially emitted in accordance with the horizontal and vertical scanning positions by the control electrode portion, it is necessary according to the scanning operation of the control electrode. Electrons can be emitted only from a part, and power can be saved.

Further, electrons are emitted from two or more split rear electrodes including the positions facing the scanning positions in the horizontal and vertical directions by the control electrode portion, the split perforated cover electrodes, or the linear electron source. Therefore, the influence on the image due to the turbulence of the beam at the division boundary is reduced, and the influence on the image can be reduced.

Further, the scanning position in the horizontal and vertical directions by the control electrode portion scans between the linear electron sources or the boundary area of the divided portions of the linear electron source in which the disturbance of the electron beam affecting the image occurs. Since the electrons are emitted from the two or more divided portions including the region or the two or more linear electron sources only during a certain period, it is possible to reduce the influence on the image due to the turbulence of the beam at the dividing boundary. .

Further, a flat electron source provided on one surface of the sealed container kept in a vacuum, a fluorescent screen formed on the other curved surface of the sealed container, and facing the fluorescent screen. And a control electrode portion formed on the same curved surface as the fluorescent screen for regulating the horizontal and vertical positions of the electron beam that is disposed between the control electrode portion and the planar electron source. An electron passage hole is provided between the control electrode portion and the planar electron source, the electron passage hole being provided between the control electrode portion and the planar electron source for correcting the variation in the current amount of the electron beam on the fluorescent screen. Since it has the electron beam amount correction electrode, it is possible to correct the variation in the amount of electron current on the fluorescent screen due to the difference in the distance between the control electrode group and the planar electron source, and to make the brightness uneven. It is possible to prevent the deterioration of the brightness.

Further, since the electron beam amount correcting electrode arranged between the control electrode portion and the electron source is formed to have a radius of curvature different from that of the control electrode portion, the distance between the electron source and the control electrode is increased. It is possible to correct the difference in the amount of electron current on the phosphor due to the difference in A, and it is possible to prevent the brightness from becoming non-uniform and prevent the brightness from decreasing.

Further, the first and second electron beam amount correcting electrodes are arranged between the control electrode portion and the electron source, and the first electron beam amount correcting electrode near the control electrode portion is the above-mentioned electrode. With a radius of curvature equal to or greater than the control electrode section,
Since the second electron beam amount correction electrode near the electron source is formed to have a larger radius of curvature than the first electron beam amount correction electrode, the electron current on the phosphor screen due to the difference in the distance between the electron source and the control electrode. It is possible to correct the difference in amount, prevent uneven brightness, and prevent decrease in brightness.

Further, since the second electron beam amount correction electrode is formed on the plane, it is possible to correct the electron current amount difference on the phosphor screen due to the difference in the distance between the electron source and the control electrode, and the brightness is improved. It is possible to prevent nonuniformity and decrease in brightness.

Further, since the first electron beam amount correcting electrode formed on the curved surface and the second electron beam amount correcting electrode formed on the flat surface are superposed on each other at the peripheral edge portion, there is a gap between the electron source and the control electrode. The difference in the amount of electron current on the phosphor screen due to the difference in the distance can be corrected, and the uneven brightness and the decrease in brightness can be prevented.

Further, the second electron beam formed to have a radius of curvature larger than that of the first electron beam amount correction electrode or to a flat surface and to cover only a portion where the distance between the electron source and the control electrode is large. Since the amount correction electrode is provided, it is possible to correct the difference in the amount of electron current on the phosphor screen due to the difference in the distance between the electron source and the control electrode, and it is possible to prevent the brightness from becoming non-uniform and to prevent the brightness from decreasing. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an electron source of a flat panel display device according to a first embodiment of the present invention.

FIG. 2 is a timing diagram illustrating a driving method according to the first exemplary embodiment.

FIG. 3 is a cross-sectional view showing a configuration of a divided back electrode group of Example 1.

FIG. 4 is a timing diagram showing a driving method according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of an electron source and a drive circuit according to a third embodiment of the present invention.

FIG. 6 is a timing chart showing a driving method according to a third embodiment.

FIG. 7 is a diagram showing a structure of an electron source and a drive circuit according to a fourth embodiment of the present invention.

FIG. 8 is a timing diagram illustrating a driving method according to a fourth exemplary embodiment.

FIG. 9 is a diagram showing a structure of an electron source and a drive circuit according to a fifth embodiment of the present invention.

FIG. 10 is a timing chart showing a driving method according to a fifth embodiment.

FIG. 11 is a diagram showing a structure of an electron source and a drive circuit according to a sixth embodiment of the present invention.

FIG. 12 is a timing diagram illustrating a driving method according to a sixth embodiment.

FIG. 13 is a diagram showing a drive circuit according to a seventh embodiment of the present invention.

FIG. 14 is a timing diagram illustrating a driving method according to a seventh embodiment.

FIG. 15 is a sectional view of an electron source showing an operating state of Embodiment 10 of the present invention.

FIG. 16 is a sectional view of an electron source showing an operating state of Embodiment 10 of the present invention.

FIG. 17 is a sectional view of an electron source showing an operating state of Embodiment 10 of the present invention.

FIG. 18 is a timing diagram illustrating a driving method according to the tenth embodiment.

FIG. 19 is a timing diagram illustrating a driving method according to an eleventh embodiment.

FIG. 20 is a sectional view showing an electrode arrangement of a flat panel display device according to a twelfth embodiment of the present invention.

FIG. 21 is a sectional view showing an electrode arrangement of a flat panel display device according to Embodiment 13 of the present invention.

FIG. 22 is a sectional view showing an electrode arrangement of a flat panel display device according to Embodiment 14 of the present invention.

FIG. 23 is a sectional view showing an electrode arrangement of a flat panel display device according to Embodiment 15 of the present invention.

FIG. 24 is a sectional view showing an electrode arrangement of a flat panel display device according to Embodiment 16 of the present invention.

FIG. 25 is a partially cutaway perspective view showing a configuration of a conventional flat-panel display device.

FIG. 26 is a sectional view of a conventional example.

[Explanation of symbols]

 1 linear hot cathode 1a-1i linear cathode 2 perforated cover electrode 3 back electrode 4 planar electron source 4a-4i linear electron source 5 second grid 6 front glass 7 hermetic container 8 fluorescent screen 9 control electrode part 10 electron Passage hole 11 Insulating substrate 12 Separation band 13 First control electrode group 13a Control electrode 14 Separation band 15 Second control electrode group 15a Control electrode 16 Split back electrode group 16a to 16i Split back electrode 17 Split back electrode driver 18 Heating Power supply 20 metal substrate 21 insulating film 22 linear hot cathode variable potential applying device 23 divided perforated cover electrode group 23a to 23i divided perforated cover electrode 24 divided perforated cover electrode driving device 25 divided perforated cover electrode variable potential drive Device 26 Linear cathode ON-potential applying device 27 Front glass 28 Control electrode part 29 Electron beam amount electrode 30 First electron beam amount supplement Electrode 31 and the second electron beam amount correction electrode

Front page continuation (72) Inventor Tetsuya Shiraishi 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Material Device Research Center (72) Inventor Shinji Shinji 8-1-1 Tsukaguchihonmachi, Amagasaki Mitsubishi Electric Corporation Stock Company Production Technology Laboratory

Claims (17)

[Claims] 1. A vacuum-sealed hermetic container, linear cathodes arranged on one surface of the hermetically sealed container, rear electrodes provided on the rear surfaces of these linear cathodes, and front surfaces of these linear cathodes. A planar electron source in which a plurality of linear electron sources composed of a perforated cover electrode covering the above is arranged, a fluorescent surface formed on the other surface of the hermetically sealed container, and a fluorescent surface formed facing the fluorescent surface. In a flat-panel display device provided with a planar electron source and having a control electrode section for regulating the horizontal and vertical positions of an electron beam to be passed therethrough, the electron beam passage position by the control electrode section is opposed. A flat-panel display device comprising means for controlling an electric field in the planar electron source so that electrons are emitted only from the position of the planar electron source. 2. The back electrode is divided and arranged corresponding to a predetermined control electrode of the control electrode portion, and the ON potential for drawing electrons from the linear cathode by the split back electrode driving means is set horizontally by the control electrode portion. 2. The flat-panel display device according to claim 1, wherein the flat-panel display device is configured to be applied to one or more divided back electrodes corresponding to the scanning position in the vertical direction. 3. The split back electrode is composed of a metal substrate, an insulating film formed on the metal substrate, and a split electrode made of a conductor formed on the insulating film. Item 2. A flat-panel display device according to item 2. 4. The split back electrode driving means is configured such that the split back electrode has a constant potential difference between the split back electrode to which the ON potential is applied and the linear hot cathode at a position facing the split back electrode. 3. The divided back electrode variable potential driving means for sequentially applying different ON potentials to each other.
The flat-panel display device described. 5. A split back electrode to which an ON potential is applied,
A linear hot cathode variable potential applying means for sequentially applying different potentials to the linear hot cathode so that the potential difference from the linear hot cathode at a position facing the divided back electrode becomes a constant value. The flat panel display device according to claim 2. 6. The perforated cover electrode is divided and arranged corresponding to a predetermined control electrode of the control electrode portion, and the ON potential for extracting electrons from the linear cathode by the divided perforated cover electrode driving means is the control electrode. 2. The flat panel display device according to claim 1, wherein the flat display device is configured to be applied to one or more divided perforated cover electrodes corresponding to horizontal and vertical scanning positions by the section. 7. The divided perforated cover electrode driving means has a constant potential difference between the divided perforated cover electrode to which the ON potential is applied and the linear hot cathode at a position facing the divided perforated cover electrode. 7. The flat-panel display device according to claim 6, wherein the divided perforated cover electrode variable potential driving means sequentially applies different ON potentials to the divided perforated cover electrodes. 8. The linear hot cathode is sequentially applied so that the potential difference between the divided perforated cover electrode to which the ON potential is applied and the linear hot cathode at a position facing the divided perforated cover electrode becomes a constant value. 7. The flat panel display device according to claim 6, further comprising linear hot cathode variable potential applying means for applying different potentials. 9. A divided portion of two or more linear electron sources including a region where the scanning position in the horizontal and vertical directions by the control electrode portion scans the region of the boundary of the divided portion of the linear electron source only. 9. The flat-panel display device according to claim 2, wherein the flat-panel display device is configured to be controlled so that electrons are emitted from the device. 10. A linear electron source forming a planar electron source is arranged for each predetermined number of control electrodes, and one or more linear electron sources corresponding to scanning positions in the horizontal and vertical directions by the control electrode portion. 2. The flat panel display device according to claim 1, wherein the linear electron source is configured to be sequentially driven to an ON state that emits electrons. 11. Control is performed so that electrons are emitted from two or more linear electron sources including the region only during a period in which horizontal and vertical scanning positions by the control electrode section are scanning between linear electron sources. 11. The flat-panel display device according to claim 10, wherein the flat-panel display device is configured as described above. 12. A hermetically sealed container kept in a vacuum, a planar electron source provided on one surface of the hermetically sealed container, a fluorescent screen formed on another curved surface in the hermetically sealed container, and the fluorescent screen. While controlling the position in the horizontal and vertical directions of the electron beam which is arranged between the planar electron source and the electron source facing each other, and a control electrode portion formed on the same curved surface as the fluorescent screen,
Disposed between the control electrode portion and the planar electron source,
An electron beam amount correction electrode having an electron passage hole for correcting a variation in current amount of the electron beam on the fluorescent screen caused by a difference in distance between the control electrode portion and the planar electron source. Flat display device. 13. The flat panel display device according to claim 12, wherein the electron beam amount correction electrode is formed with a radius of curvature different from that of the control electrode portion. 14. The electron beam amount correction electrode is composed of first and second electron beam amount correction electrodes arranged apart from each other, and the first electron beam amount correction electrode on the side closer to the control electrode portion. Is formed to have a radius of curvature equal to or larger than that of the control electrode portion, and the second electron beam amount correction electrode on the side closer to the planar electron source has a radius of curvature larger than that of the first electron beam amount correction electrode. 13. The flat panel display device according to claim 12, wherein the flat panel display device is formed. 15. The flat panel display device according to claim 14, wherein the second electron beam amount correction electrode is formed on a flat surface. 16. The first electron beam amount correction electrode formed on the curved surface and the second electron beam amount correction electrode formed on the flat surface are joined at the peripheral edge portion. The flat-panel display device described. 17. The second electron beam amount correction electrode is the first electron beam amount correction electrode.
The electron beam amount correcting electrode has a radius of curvature larger than that of the electron beam amount correcting electrode, or is formed in a planar shape, and is formed in a size that covers only a portion where the distance between the planar electron source and the control electrode is large. Item 15. The flat-panel display device according to Item 14.