JPH0448538A - Plane display - Google Patents

Abstract

PURPOSE:To prevent vibration of cathode to improve such characteristics as the fineness of a picture, reduction of power consumption, intensification of luminance, reduction of turbulance of an image, etc., by introducing electron beams from an electron gun along the space between an electrode body structure and a vertical deflection electrode. CONSTITUTION:An electron beam b from an electron gun 10 is introduced along the space between an electrode body structure 7 and a vertical deflection electrode 3. The cathode 1K of the electron gun 10 is made up by linearly arranging a plurality of field emission type cathodes. The electron beams b are as a whole discharged in a band or linearly. By applying necessary voltages to the parallel electrode 3a of an electrode 3 synchronously with a vertical scanning period to form a deflecting field proceeding to an electrode body structure (7) side, vertical scanning of the electron beam b is performed. Moreover, the thus vertically deflected electron beam b, by applying necessary voltage to the counter electrode 4 to cooperate with the electrode 3, the electron beam b is made to proceed toward a fluorescent screen 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flat display device capable of displaying various images.

[Summary of the invention]

The present invention relates to a flat display device, in which a fluorescent screen is arranged on the inner surface of the front panel of a flat tube, an electron gun is arranged at a position offset from the part facing the fluorescent screen, and A vertical deflection electrode consisting of a plurality of parallel electrodes extending along the horizontal scanning direction is arranged on the inner surface of the back panel facing the panel, on the part facing the phosphor screen. An electrode structure is disposed opposite to the deflection electrode and has at least a counter electrode having an electron beam transmission hole, a modulation electrode, and a horizontal deflection electrode, which constitute a vertical deflection system by cooperating with the vertical deflection electrode. The cathode is made up of a plurality of field emission type cathodes arranged in a line, and the electron beam from the electron gun is introduced between the electrode structure and the vertical deflection electrode, thereby suppressing the vibration of the cathode. To avoid this problem and enable stable screen projection and enlargement of the screen, and also to reduce reactive current to achieve lower power consumption and higher brightness.

[Conventional technology]

Various proposals have been made as flat display devices, that is, panel display devices. For example, JP-A-1-173555
In the publication No. 1, a proposal is made for a secondary electron multiplier type panel cathode ray tube. It is desired that this type of flat display device be applied to a wide area display device such as a 40-inch type display device.

In this flat display device, the above-mentioned Japanese Patent Application Laid-Open No. 1-173
As in the cathode ray tube type display device disclosed in Publication No. 555, a plurality of cathodes or filaments are provided, and thermionic electrons generated from the cathodes or filaments are directed toward a phosphor screen and modulated in accordance with a display signal. The desired display is performed by emitting light from each part of the phosphor screen, but when multiple cathodes (filaments) are arranged to share the generation of light in each part of the screen, due to variations in the characteristics of each cathode, Problems may arise in displaying images with varying brightness in each part.

[Problem to be solved by the invention]

A structure for avoiding the provision of such a plurality of cathodes (filaments) and providing, for example, one cathode for a displayed image is disclosed in, for example, Japanese Patent Laid-Open No. 60-115134.
This disclosure is also included in the publication.

Furthermore, in the Japanese Patent Application Nos. 1-331593 and 1-331594 filed by the present applicant entitled "Flat type display device", in this type of one-line cathode structure, the variation of the focusing condition due to the scanning position is avoided. and proposes an enlarged structure for large-screen display.

However, in the case of such a one-line cathode structure, when the cathode length in the vertical scanning direction of the screen increases to about 10 hs or more as the screen becomes larger, there is a problem that the line cathode becomes susceptible to vibration. This vibration may have a serious effect on the trajectory of the electron beam, resulting in a problem of deterioration of the definition of the image display. For this reason, conventional measures have been taken such as providing a support in the middle of the stretched line cathode.

FIG. 11 shows an enlarged cross-sectional view of such a conventional one-line two-cathode structure provided with one cathode. The line cathode (81) is made of, for example, a tungsten wire coated with a ternary salt, and as shown in FIG.
80) It is stretched by a support part (82) fixed on the top and is prevented from vibration by a column (83). (84) is the back electrode, and 01 to G4 are the first
~Fourth grid electrode.

In such a configuration, for example, in the first to fourth grids 01 to G4, 30V is applied to G1, 15V is applied to G2, and
By applying a voltage of 350 cm to G3 and 110 cm to G4, and further applying a voltage of -10 V to the back electrode (84), an electron beam with the required acceleration can be obtained.

However, this line cathode (81) becomes hotter than 76 (L'C) during electron beam irradiation, so
Heat escapes from the contact point at the cathode (83)
) temperature decreases. This temperature drop phenomenon is called end cool (EC), and the cathode (81) in the region EC about 10+ms+ from the pillar (83) becomes a region where the temperature decreases and thermionic emission characteristics deteriorate. When the vibration of the cathode (81) is prevented by introducing the pillar (83) in this way, there is a problem in that the ineffective area of the line cathode (81) increases and the thermionic emission characteristics of the cathode (81) deteriorate. .

Further, electrons emitted from such a line cathode (81) with a linear cross section along the line direction are divided into a plurality of parts by, for example, a horizontal deflection electrode on the way to the phosphor screen. The linear electron beam collides with, for example, the horizontal deflection electrode, which is divided into a plurality of parts, producing many invalid electrons.Furthermore, the stray electrons due to the secondary electrons generated by this collision are transmitted to insulators such as the tube wall surface. This caused charge-up in exposed areas, causing image disturbances. In order to reduce the generation of reactive electrons, that is, the reactive current, the above-mentioned line cathode (81)
Since it is necessary to apply the above ternary salt in a distributed manner so as to correspond to each divided beam part of the horizontal deflection electrode,
There was a problem that this resulted in a decrease in workability.

The present invention aims to improve the definition of images by avoiding cathode vibration that accompanies the enlargement of the screen in this type of flat display device, and to reduce power consumption and increase efficiency by reducing reactive current. Aims to improve characteristics such as brightness and reduction of image disturbances.

[Means to solve the problem]

The present invention has a front panel ( A phosphor screen (2) is disposed on the inner surface of the IF), and an electron gun (10) is disposed at a position offset from a portion facing the phosphor screen (2), for example, at a position offset in the vertical scanning direction.

On the inner surface of the back panel (IB) facing the front panel (IF) of the flat tube body (1), on the part facing the fluorescent screen (2), a plurality of parallel electrodes ( 3a
) is arranged.

Then, in the space between the vertical deflection electrode (3) and the phosphor screen (2), a vertical deflection electrode (
an electrode structure (4) having at least a counter electrode (4) having an electron beam transmission aperture SL, a modulation electrode (5), and a horizontal deflection electrode (6), which cooperate with each other to form a vertical deflection system (34); 7) is placed.

Particularly in the present invention, the cathode (IK) of the electron gun (10) is configured such that a plurality of field emission type cathodes are arranged in a line.

A field emission cathode is a material such as MO that contains 106 to 10
An electron beam is obtained by utilizing the fact that when an electric field of about V/cm is applied, electrons are emitted due to the tunnel effect.

The electron beam b from this electron gun (10) is transmitted through the electrode structure (
7) and the vertical deflection electrode (3), that is, the vertical deflection electrode (3).
) and the counter electrode (4) into a vertical deflection system (34).

Note that in this specification, the horizontal and vertical scanning directions do not refer to the physical horizontal and vertical directions, but to two mutually orthogonal directions on the screen.

[Effect]

In the above configuration, the electrode structure (7) and the vertical deflection electrode (
3) An electron beam b from an electron gun (lO) is introduced along the space between the two.

The cathode (IK) of this electron gun (10) is composed of a plurality of field emission type cathodes arranged in a line.

By doing so, the electron beam b is emitted in the form of a band or line as a whole.

The electron beam b from the electron gun (10) is applied to the parallel electrode (3a) of the vertical deflection electrode (3) by sequentially applying a required voltage to the parallel electrode (3a) in synchronization with the vertical scanning period.
The electron beam b is vertically scanned by forming a deflection electric field toward the side, and the electron beam b vertically deflected in this way is applied to the counter electrode (4) together with the vertical deflection electrode (3). By applying a required voltage to the phosphor screen (2), it is directed toward the phosphor screen (2).

In this way, in the flat display device according to the present invention, the electron beam b is obtained by a plurality of field emission type cathodes, and as a result, even if the length of the cathode (IK) becomes large, vibrations can be prevented. It is possible to have a structure in which no electron emission occurs, and it is possible to increase the screen size without deteriorating the electron emission characteristics.

〔Example〕

Embodiments of a flat display device according to the present invention will be described in detail with reference to the drawings.

In the present invention, a flat tubular body (1) is used.

This flat tube body (1) has at least a light-transmissive front panel (IF) and a back panel (IB) that are hermetically sealed together via a peripheral side wall (IS). (21) shows the tip-off tube in which the flat tube body (1) is evacuated and sealed after being evacuated;
) and the peripheral side wall (Is) are formed, for example, by glass plates and are glass fritted to each other.

On the inside of the front panel (IF), a phosphor screen (2) formed directly or on another transparent substrate is placed, and as usual, this phosphor screen (2) is coated with an At evaporated film, etc. A metal back is applied.

In addition, a vertical deflection electrode (3) formed directly or on another substrate is arranged on the back panel panel (IB), and a vertical deflection electrode (3) formed directly or on another substrate is arranged between the vertical deflection electrode (3) and the phosphor screen (2). The electrode assembly (7) is arranged with a required spacing from the deflection electrode (3). This vertical deflection electrode (3) is shown in FIG.
The figure shows a pattern diagram of each electrode seen from the front side, and as shown in Figure 5 a cross-sectional view, it can be made by etching a thin film of 426 alloy or chromium in a strip shape, by metal vapor deposition film, or by carbon coating by screen printing. A plurality of, in particular, the number of vertical scanning lines, for example 480 to 5, processed by a film or the like and extending along the horizontal scanning direction with the required width and spacing.
25 parallel electrodes (3a) are arranged.

The electron gun (10) is placed at a position offset from the portion facing the phosphor screen (2), for example, at a position offset in the vertical scanning direction. As shown in an enlarged cross-sectional view in FIG. 6, this electron gun (10) has a cathode (IK) formed by, for example, a plurality of field emission cathode members K arranged in a line, and a cathode (IK) directly facing the cathode (IK). The first to fourth grid electrodes G1 to G4 each have slits extending in the horizontal scanning direction.

The cathode (IK) is, for example, Spindt.
Adopts a field emission cathode configuration. This cathode width) is
A back electrode (41) that applies a required removal voltage to each of the field emission cathode members arranged in a straight line, an insulator (42), and a drawer that applies a required positive voltage to draw out electrons. The electrodes (43) are sequentially arranged.

An example of a method for manufacturing such a cathode (IK) is shown in the process diagrams of FIGS. 7A to 7D. First, as shown in FIG. 7A, S
An insulating layer (42A) made of 5 iOz is deposited on the entire surface of the back electrode (41) in the form of a strip or line with a desired width and length by CVD (chemical vapor deposition) or the like. A metal layer (43A) of Nb or the like is further deposited to a thickness of 0.4 μm, for example, by vapor deposition.

Next, as shown in FIG. 7B, for example, the pitch P in the length direction
is about 5 μm, and a circular hole (44) with a diameter of, for example, 1.2 μmφ is formed by anisotropic etching such as RIE (reactive ion etching).
At the same time, an opening (45) having a larger diameter than the circular hole (44) is formed by isotropically etching the insulating layer (42A) through the circular hole (44).

Thereafter, as shown in FIG. 7C, a metal layer (46) made of, for example, Ni is deposited on the extraction electrode (43) by oblique vapor deposition. This oblique vapor deposition is performed, for example, while rotating the main body of the back electrode (41), so that a circular hole (46A) having a conical inner peripheral shape is formed around the upper circumference of the circular hole (44). In this case, the metal layer (46) is deposited at an angle such that it is not deposited through the circular hole (44) into the opening (45). Then, on this metal layer (46), an electrode layer (47) made of, for example, Mo is deposited by vapor deposition or the like. At this time, even if the vapor deposition is performed perpendicularly to the back electrode (41), the electrode layer (47) is formed with a slope following the slope of the metal layer (46) around the circular hole (44). When the thickness is reached, the circular hole (44) is closed.

At this time, inside the opening (45), the bottom is almost the metal layer (46).
A conical field emission type cathode member K is formed having a circular shape equal to the opening in ).

Then, as shown in the seventh diagram, the metal layer (46) and electrode layer (47) on the extraction electrode (43) are removed to obtain the cathode (IK) of the electron gun. At this time, the field emission type cathode member is formed with approximately the same pitch as the pitch p of the circular holes (44), and the distance between the extraction electrode (43) and the top of the field emission type cathode member in the cathode extension direction! is 0.6
It can be about μtin.

In this way, the electron beam b is obtained as an aggregate of electrons emitted from the field emission type cathode member K, which is about 5 to 6 microns in size. In this case, the field emission type cathode member K
Since the cathode (IK) is fixed, it is possible to create a structure in which vibration does not occur at the cathode (IK).

When the field emission type cathode member K is formed by the method described above, the variation in characteristics between the cathodes can be significantly reduced compared to the conventional case of using a plurality of filaments, and each part can be formed in the same way as a one-line type cathode. It is possible to display images with different brightness.

An electron gun (
10), the back electrode (41) and the extraction electrode (
43) A required voltage is applied to the field emission type cathode member to extract electrons with the required energy, and further, as shown in FIG. A linear or band-shaped electron beam b can be obtained by applying a required voltage to the first grid electrode G1 made of a metal plate on a mesh and 02 to G4 formed into a frame shape, for example.

As shown in FIG. 3, this electron beam b is emitted from a large number of cathode members K in a direction perpendicular to the surface direction of the panels (IF) and (IB) and in the horizontal scanning direction, and the cross section thereof as a whole is linear or strip-shaped. The beam is introduced as a so-called laminar beam along the space between the electrode structure (7) and the vertical deflection electrode (3).

The counter electrode (4) is, for example, as well as in FIGS.
As shown in the exploded perspective view in the figure, for example, the required pitch ps
(t) A large number of electron beam transmission holes (e.g., a sleeve) extending in the vertical scanning direction with a two-needle pitch and arranged in parallel.
It can be constituted by an electrode plate having L perforated therein.

Further, the modulation electrode (5) is attached to an insulating substrate S8 in which a slit-shaped electron beam transmission hole h8 provided corresponding to the slit SL of the counter electrode (4) is formed. Electrode conductive layers (5a
) is coated.

Further, the horizontal deflection electrode (6) has a laminated structure of a plurality of electrode parts (6a) and (6b), for example, in the illustrated example. Each electrode part (6a) and (6b) has, for example, an electron beam transmission hole hH1 and a □ which are provided corresponding to the slit SL of the counter electrode (4) and the electron beam transmission hole h8 of the modulation electrode (5), respectively. Insulating substrate SHI and 5
A pair of conductive layers (6a , ) (6a z) and (6b+) (6bz
) is formed by adhesion.

The insulating substrates SN, SMI, and SMI of these modulation electrodes (5) and horizontal deflection electrodes (6) are formed of, for example, photosensitive glass, and each electron beam transmission hole has hNI, hNI is formed optically, that is, by exposure and development processing. are perforated, and each conductive layer (5A),
(6a, ), (6az), (6b+), (6bz)
form.

Furthermore, this electrode structure (for example, a horizontal deflection electrode (6) as shown in the enlarged cross-sectional view of FIG. 5)
A shield electrode (12) can be placed between the phosphor screen (2) and the phosphor screen (2). The shield electrode (12) is composed of a plurality of metal electrode plates (12A) to (120), for example, four metal electrode plates, each having an electron beam transmission hole hsA to hsn corresponding to an electron beam transmission hole hHt for selecting an electron beam. It consists of being set up.

Between the electrodes that constitute this electrode structure (7) and should be electrically separated from each other, for example, the counter electrodes (4) that are adjacent to each other in sequence.
, between the modulation electrode (5), the horizontal deflection electrode (6), and the shield electrode (12), and between each electrode (12A) to (120) of the shield electrode (12) using insulation methods such as glass beads. (11) is interposed. Furthermore, the electrode structure (7)
An insulation method (11) is also interposed between the front panel (IF) and the front panel (IF) to maintain the required spacing.

In the phosphor screen (2), for example, several sets of vertically extending striped red, green, and blue phosphor triplets are provided for one beam transmission hole hso.

In such a configuration, the cathode (
IK), for example, as mentioned above, the distance Mp between the top of the field emission cathode and the extraction electrode (43) is set to 0.6.
μ... For example, by applying a voltage of 80 V to the OV1 extraction electrode (43) on the back electrode (41), electrons can be extracted with the required energy by the field emission type cathode member. Furthermore, the first to third grid electrodes G
30V, -5V, 350V, 10 for 1 to G4 respectively
Apply a voltage of 0■. Then, a required voltage is applied to the counter electrode (4) and the parallel electrode (3a) forming the vertical deflection electrode (3) to form a vertical deflection system (34). In this case, a potential difference is applied to the parallel electrode (3a) of the vertical deflection electrode (3) between adjacent electrodes (3a+) and (3az) corresponding to a predetermined vertical scanning position (3), that is, the electrode (3a I)
For all electrodes (3a) located closer to the electron gun (10), a voltage of 100 V, which is the same potential as the counter electrode (4), is applied.
from the opposite electrode (3a-) to the electron gun (
Ov is applied to all the electrodes on the opposite side to 10), and the position V where the potential difference is applied is sequentially moved in the vertical scanning direction in synchronization with the vertical scanning speed and period. In this way, the electrodes (3a,) and (3az
), the electron beam b is deflected as shown in FIG.
L is introduced while its position is vertically scanned, and each sulin l
-1 by beam b from electron gun (10) by 3L
The beam spot of the strip is divided into a plurality of spots according to the number of slits SL.

A voltage of, for example, 200 V is applied to the modulation electrode (5) to focus each divided beam, and the electrode conductive layer (5a) arranged around the periphery of each electron beam transmission hole 4 is For example, a pulse width modulated voltage is applied depending on the display signal.

The horizontal deflection electrode (6) is arranged in synchronization with the horizontal scanning to sequentially move the phosphor screen area corresponding to each electron beam transmission aperture, for example, red,
In order to sequentially deflect multiple sets of green and blue triplets, a deflection voltage of, for example, 300V±100V is applied to a pair of deflection electrode conductive layers (
6a+) (6b+) and (6az) (6bz) to perform a minute horizontal deflection, thereby horizontally deflecting each divided beam divided by the slit SL of the counter electrode (4).

A high voltage, for example 10 kV, is applied to the phosphor screen (2),
Each electrode plate (12A) to (12D) of the shield electrode (12)
), high voltages such as 2kV, 4kV, 6kV, and 8kV are sequentially applied to the electrode plate on the phosphor screen (2) side to apply high voltage to the horizontal deflection electrode (6) and modulation electrode (5). Shield from intrusion.

As mentioned above, in the present invention, the entire area on the phosphor screen (2) is excited by one laminar beam b, but the density of the electron beam is not high enough, that is, the anode If a sufficient current cannot be obtained, a secondary electron multiplier (22) can be arranged, for example, between the horizontal deflection electrode (6) and the modulation electrode (5).

This secondary electron multiplier (22) includes a modulation electrode (5) and a horizontal deflection electrode (22), as shown in FIG.
6) between each, for example, a plurality of electrode plates (22A)
(22B) (22C) are provided, and these electrode plates (
22A) (22B) (22C), each electron beam transmission hole hMA"""hMc corresponding to the slit SL is bored, and the inner surface thereof generates a large amount of secondary electrons by the impact of electrons, that is, 2 By coating a substance such as Mg with a high secondary electron emission ratio, the electrons guided to the transmission holes hMA"hMc can be quadratic multiplied and directed toward the phosphor screen (2). In this case, it is desirable to apply a higher voltage to each of the secondary electron multiplier electrode plates (22A), (22B), and (22C) in sequence toward the side closer to the phosphor screen (2). Furthermore, an insulation method (11) such as glass beads can be placed between each electrode plate in the same way as the electrode assembly (7).

In addition, the horizontal deflection electrode (6) is not limited to the above-mentioned example, but the horizontal deflection electrode (6) may be formed into three electrode portions (6A) to (6C) that are electrically independent from each other, as shown in the cross-sectional view of FIG. , the positional relationship of the electron beam transmission aperture hMA"hHe is eccentric to the left and right around the transmission hole hHA, and the divided beam b is minutely deflected left and right with high resolution by applying a horizontal deflection voltage to the electrode part (68)B. You can also choose

Furthermore, the arrangement of the field emission type cathode member is not limited to the above-mentioned example. For example, in FIG. A plurality of electrodes (41) and (43) may be independently provided corresponding to the cathode member K.

In the above cathode (IK), one field emission type cathode member K is provided for each electron transmission hole of the electrode assembly (7), that is, one slit SL of the counter electrode (4).

Alternatively, the cathode member K provided for one slit SL can be formed by a collection of minute cathode members.

Corresponding to each slit SL as described above, 1
When a cathode (IK) is formed by a member K made up of individual field emission type cathode members or a collection of minute cathode members, it is compared to a case where one strip-shaped cathode member is continuously arranged for all the slits SL. and the electrode structure (
7) The generation of invalid electrons due to collision with parts other than the slit SL can be reduced, and the reactive current can be reduced.

〔Effect of the invention〕

As described above, in the flat display device according to the present invention, the electron beam b from the electron gun (10) is introduced along the space between the electrode structure (7) and the vertical deflection electrode (3). The cathode (IK) of this electron gun (10) is made up of a plurality of field emission type cathode members K arranged in a line, so that vibrations occur even if the overall length of this cathode (IK) is increased. Therefore, it is possible to achieve stable screen projection and enlargement of the screen without deteriorating the electron emission characteristics.

In addition, when forming the field emission type cathode member K, back electrode (41), extraction electrode (43), etc. that constitute the cathode (1K), the shape can be easily controlled and manufactured with high precision. Compared to a conventional cathode formed by arranging a plurality of filaments, variations in characteristics can be made much smaller, and therefore unevenness in image brightness can be avoided.

Furthermore, by distributing this field emission type cathode member K in a manner corresponding to the width and pitch of the electron transmission hole sulin l-3L0 of the electrode structure (7), generation of invalid electrons is suppressed, and secondary Electrons and stray electrons can avoid charge amplifiers on exposed insulators on the tube wall, etc. to avoid image disturbances, and by reducing reactive current, it is possible to reduce power consumption and increase brightness. It can be measured.

[Brief explanation of drawings]

FIG. 1 is a front view of an example of a flat display device according to the present invention;
FIG. 2 is a top view, FIG. 3 is a cross-sectional view in the vertical scanning direction, and FIG. 4 is a pattern diagram of each electrode seen from the front.
FIG. 5 is a cross-sectional view of essential parts showing an example of an electrode structure, FIG. 6 is a cross-sectional view of an example of an electron gun, and FIGS. 7A-D
8 is a process diagram showing each manufacturing process of a field emission cathode.
The figure is an exploded perspective view of the main part of the electrode structure, FIG. 9 is a cross-sectional view of an example of a secondary electron multiplier, and FIG. 10 is an electrode configuration diagram of another example of a horizontal deflection electrode and an electron beam transmission hole. FIG. 11 is a cross-sectional view showing the conventional one-line two-cathode structure. (1) is a flat tube body, (IF) is a front panel, (IB)
is the back panel, (IS) is the peripheral side wall, (21) is the tip-off tube, (2) is the fluorescent screen, (3) is the vertical deflection electrode, (4)
is a counter electrode, (34) is a vertical deflection system, (5) is a modulation electrode, (6) is a horizontal deflection electrode, (7) is an electrode structure, (10)
is an electron gun, (11) is an insulating layer, (12) is a shield electrode, (IK) is a cathode, (41) is a back electrode, (42)
is an insulator, (43) is an extraction electrode, (42A) is an insulating layer, (43A) is a metal layer, (44) and (46A) are circular holes, (45) is an opening, and K is a field emission cathode member. ,
G1-G4 are first to fourth grid electrodes. Figure: Top view of the flat type display length 1 Figure 2: Screen view of the main gosashi, Shiki force direction Figure 3: Cross-sectional view of the electric gun Figure 6: The main point of the electric sword Saw L @ Gaiko, Sugi fr Written amendment to oral proceedings August 21, 1990 1990 Patent Application No. 156168 2, 'i
'if II! 1(7) S if,
Relationship between flat display device 3 and the amended case

Claims (1)

[Claims] A fluorescent screen is arranged in the inner tube of the front panel of the flat tube, and an electron gun is arranged at a position offset from the part facing the fluorescent screen, and the front surface of the flat tube A vertical deflection electrode consisting of a plurality of parallel electrodes extending along the horizontal scanning direction is disposed on the inner surface of the rear panel facing the panel at a portion facing the phosphor screen, and between the vertical deflection electrode and the phosphor screen. an electrode structure including at least a counter electrode having an electron beam transmission hole that faces the vertical deflection electrode and forms a vertical deflection system by cooperating with the vertical deflection electrode, a modulation electrode, and a horizontal deflection electrode, in a space of is arranged, the cathode of the electron gun is made up of a plurality of field emission cathodes arranged in a line, and the electron beam from the electron gun is introduced between the electrode structure and the vertical deflection electrode. A flat display device characterized by the following.