JPS58129886A - Picture display device - Google Patents

Abstract

PURPOSE:To attain a high luminance and high resolution picture and to simplify the driving circuit, by applying a pulse signal voltage to a linear hot-cathode and making the potential difference between both ends almost zero temporarily. CONSTITUTION:When a voltage V1 is applied to a linear hot-cathode 20, the cathode 20 is in electron emitting state, and since a negative voltage is applied to a cylindrical barrier electrode 21, no electron is emitted. When a negative voltage is applied to the electrode 21, the electrode is kept at cut-off state over the entire length of the cathode 20. In this state, when a negative pulse voltage is applied to one end of the cathode 20 with a pulse voltage generator 33, the cathode is negative and electrons are emitted. In this case, at the other end of the cathode 20, a diode 32 receives inverse voltage, the potential difference across the cathode 20 is almost zero and the potential gradient toward axial direction is lost. Thus, electron beams with uniform and high current density are obtained and then sharp picture is obtained. Further, the number of electrodes is saved remarkably, the drive circuit is simplified and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device having a linear hot cathode, and particularly to an image display device that can extract a uniform electron beam from the linear hot cathode.

Conventionally, as a matrix type flat display device, EL,
Devices using plasma, liquid crystal, etc. have been developed, but they still do not have sufficient performance in terms of brightness, luminous efficiency, color display, etc., and image display like TV operation is far from practical. has not been reached.

On the other hand, attempts have been reported to construct flat display devices using electron beams. That is, this device displays characters or images by controlling the electron beam emitted from an electron source using a flat matrix type electron beam control electrode.

FIG. 1 shows an example of a main part configuration diagram of this type of display device.

1 is a flat electron source in which hot cathodes, field emission cold cathodes, etc. are used; 02 is a large number of through holes JP-A-58-1298;
86 (2) A positive voltage is applied to the cathode 1 using a grid-like electrode plate with holes 6 formed therein, and an electron beam is extracted. A portion of the electron beam passes through the through holes of the grid electrode plate 2 and reaches the surface of the electron beam control electrode plate 3. The control plates 3 and 4 have a large number of through holes 6a and 6b regularly drilled vertically and horizontally.
Strip-shaped electrodes 7 and 8 are provided in each row and column,
The through holes 6a and 6b provided in both electrode plates are arranged so as to be perpendicular to each other at an appropriate interval 7 and to coincide with each other at each orthogonal intersection point. The beam current of the electron beam that has reached the surface of the electron beam control electrode plate 3 is modulated in accordance with the signal voltage applied to each strip-shaped electrode 7, and the electron beam reaches the surface of the electron beam control electrode plate 3.
a and reaches the surface of the electron beam control electrode plate 4.

Regarding the electrode plate 4, the electron beam is modulated by the same mechanism as the electrode plate 3 and passes through the through hole 6b. The electron beam passing through the through hole 6b is accelerated by a positive high voltage applied to the accelerating electrode plate 9, and collides with the phosphor shoulder 11 coated on the surface of the accelerating electrode 9, causing it to emit light.

Generally, a focusing electrode plate is placed between the electron beam control plate 4 and the accelerating electrode plate 9 to focus or collimate the electron beam and to prevent the potentials of the control electrodes 3 and 4 from being affected by the high voltage for acceleration. Insert 5.

In the display device configured in this manner, characters or images can be displayed by sequentially applying signal voltages to each electrode of the electron beam control electrode plates 3 and 4. 1o is a transparent glass substrate.

Generally, in this type of display device, a so-called matrix type display device, the resolution of an image is determined by the size and pitch of through holes provided in the electron beam control electrode or its substrate. Therefore, the higher the resolution and the clearer the image, the smaller the diameter of the through holes and the smaller the pitch. ◇ To obtain clear images of a certain size When you try to do so, the through hole 6a.

It is necessary to arrange the electrodes 6b and the electrodes 7 and 8 at a higher density, and the number of holes and the number of electrodes must be significantly increased. For example, if you try to display a TV image, the minimum
oxsoo through holes are required, and each electron beam control electrode plate has 500 electrons 61. −1. A pole is necessary. Furthermore, if color display is attempted, three times as many through holes and electrodes are required.

With current materials and processing technology, the limit is 2 to 3 per pharynx, and sufficient resolution cannot be obtained.

Furthermore, increasing the number of holes and electrodes significantly increases the number of drive circuits for driving each electrode and the number of connection points between the drive circuit and each electrode, which poses a major problem in mounting.

As a method for solving the above problems, a method is proposed in which the electron beam is controlled by a pair of matrix electrodes and deflected vertically and horizontally by deflection electrodes, as disclosed in US Patent No. 3,935,5.
It is disclosed in No. 00. In the above-mentioned US patent, each through-hole formed in the matrix electrode as a cathode has one
Since several hot cathodes are provided, the electric power for heating is significantly large, and the emitted electron current between the individual cathodes is
9 Ratsuki is a big problem in practice.

The present invention solves the above-mentioned problems and provides a flat 7-bay image display bag device which can provide a high-brightness, high-resolution screen, has excellent brightness uniformity, is easy to assemble, and has high industrial value. This is what we provide.

FIG. 2 shows a partially exploded perspective view of the basic configuration of the flat image display device of the present invention. 20 is a linear hot cathode, and 10
An oxide cathode material is applied to a tungsten wire of ~2oμφ. Reference numeral 21 denotes a U-shaped or U-shaped partition wall electrode, which is arranged so as to cover the periphery of each linear hot cathode except for the front side. The structure is such that a high-density electron beam flows into the provided through hole 22a. A series of through holes 22a formed in the electrode 22 for extracting the electron beam are formed in parallel and opposite to each linear hot cathode.

23 is a plurality of strip-shaped electrodes, and a through hole 23a is formed coaxially with the through hole 21a formed in the electrode 22. The electrodes 24 and 25 are used to shape the electron beam, and have through holes 24a and 25a coaxially with the through holes 22a and 23a formed in the electrodes 22 and 23. The electrode 26 and 26' constitute a pair of electrodes for vertical deflection. Similarly, 27 and 27' are electrodes for horizontal deflection. The electrode 28 is a grid-shaped electrode and serves as an electrode for blocking an electric field so that the influence of the high voltage applied to the electrode 29 for accelerating the electron beam does not adversely affect the electrodes 27 and 27' for deflecting the electron beam. be.

31 is a transparent glass substrate, on the surface of which is coated a phosphor layer 3o that emits light upon collision with an electron beam;
A thin aluminum film 29 is deposited on its surface, and forms a display surface as well as an accelerating electrode.

Each electrode component will be described in detail based on the results of a display device having a 5-inch display surface in a flat display device having the above basic configuration.

The structure of the vicinity of one linear hot cathode 2o in the cathode section shown in FIG. 2 is shown in FIG. A cathode portion is constituted by the linear hot cathode 2o, the partition electrode 21, and the electrode 22 for extracting the electron beam. The linear hot cathode 2o is made by electrodepositing ternary oxide cathode material (Ba, Sr, Ca) CO3 to a thickness of 10 to 20 μm on a 20 μφ tungsten wire, and 16 wires are stacked horizontally at 5.08 mm intervals. One linear hot cathode irradiates one-sixteenth of the display surface, and 16 linear hot cathodes irradiate the entire display surface with electron beams. Each linear hot cathode 2o needs to be stretched with an appropriate tension so as not to sag during operation. Each linear hot cathode 20 is stretched approximately at the center of a U-shaped or U-shaped cylindrical partition electrode 21, and is shaped like a plate by a focused electric field formed by the partition electrode 21 and the electrode 22 for extracting the electron beam. electron beam is formed. In addition to the shape described above, the partition electrode 21 can be formed of a parallel plate and serves as a back electrode of the linear hot cathode 2o.

The electrode 22 for extracting the electron beam is a metal conductor plate, and 81 through holes 22a each having a hole diameter of 0.8φ are bored at a pitch of 1.27 mm corresponding to each linear hot cathode 20.

FIG. 3 shows a wiring diagram of the cathode section of the present invention. The cathode section shown in FIG. 3 was proposed by the present inventors in Japanese Patent Application No. 53-1O-'51B10, and is intended to obtain a uniform electron beam with a high current density. One end of the linear hot cathode 2o is connected to the positive electrode of the power source v1 via a resistor R. The other end of the hot cathode 20 is characterized in that it is connected to the negative electrode of the power source v1 via a diode 32. 3
3 is a negative pulse voltage generator. A negative voltage is applied to the cylindrical electrode (partition electrode) 21 by a power source v2, and a positive voltage is applied to the electrodes 22 and 23 by power sources v3 and v4, respectively.

When power is supplied to the linear hot cathode 20 by the power supply v1, the hot cathode 2o becomes in a state where it can emit electrons, but even though a positive voltage is applied to the electrode 22, a negative voltage is applied to the cylindrical partition electrode 21. Electrons are not emitted because the voltage is applied. In other words, it can be considered that a bias voltage is applied to the electrode 21 to prevent electron emission.

Note that when a negative voltage is applied to the partition electrode 21, the linear hot cathode 2o can be maintained in a cut-off state over its entire length. The reason is that one end of the linear hot cathode on the diode 32 side is at 0 potential, and the electrode 2
Since a positive potential is applied to the linear hot cathode 2, the diode 32 side of the linear hot cathode 20 does not seem to be in a cut-off state when viewed from below. However, since the partition electrode 21 is negative, the linear hot cathode 20 The vicinity of the hot cathode 20 can be held at a negative potential with respect to the cathode (due to the negative potential of the partition electrode 21), and the linear hot cathode 2
It is possible to create a state in which no electrons are emitted from o, and l
.

However, in this state, when a negative pulse voltage is applied to one end of the hot cathode 2o by the pulse voltage generator 33, the hot cathode 2o
0 becomes negative and electron emission occurs. At this time, the diode 32 is in the opposite direction at the other end of the hot cathode 20, so that the potential difference between both ends of the hot cathode is approximately 0, and there is no potential gradient in the axial direction. Therefore, an electron beam that is uniform and has a high current density is obtained. be able to.

Figure 4 shows the electron beam flowing to each electrode through the connections shown in Figure 3:
- shows the measured value of the current. I,, I.

and I4 indicate the electron beam currents flowing through the electrodes 21, 22 and 23, respectively. v3 is +20V.

These are the measured values when v4 is +60V, the pulse voltage is -20V, and the bias voltage of the cylindrical JP-A-8B58-129886 (4) electrode 21 is varied. Note that the cross section of the cylindrical electrode 21 is, for example, 5 rran
X 5.08 mm, and measurements were taken with a linear hot cathode 2o stretched and fixed at its center.

As is clear from FIG. 4, when the voltage applied to the cylindrical voltage 21 is lower than about -11V, no current flows, and all of the current flows into the electrode 22, and part of it flows into the through hole 22a provided in the electrode 22 (the effective area is 8 of the electrodes 22) and flows into the acceleration electrode 23.

When the potential of v2 is 11oV, -20V and -3°70, the beam current passes through the through hole 220 of the electrode 22. (
The electron beam current (current flowing through the electrode 23) is emitted from the linear hot cathode 2o.

13%, 35chi, and 69q6, and it can be seen that the electron beam current utilization rate becomes very high. The cause is the three electrodes 21.22.2 that constitute the cathode section.
3 forms a hanging glass-shaped equipotential surface with the linear hot cathode 2o at its apex, and the electron beam is focused in a plate shape on the through hole 22a, so that the number of electron beams is 13.

Next, improvements in the uniformity and density of the electron beam in the electron source shown in FIG. 3 will be explained with reference to FIGS.

FIG. 6 shows the difference between the present invention and the conventional electron beam extraction method when a cathode heating voltage of 6 V is applied to the hot cathode 2o having a length of 12 crn, and +1 ov is applied to the electron extraction electrode 22 which is the counter electrode. This is a comparison of uniformity. FIGS. 6(a) and 6(b) show the potential difference and the relative value of the electron beam current at different positions along the length of the linear hot cathode, respectively. The curve (■) is for the present invention, and the curve (■) is for the conventional case. As is clear from this figure, when an electron beam is emitted by simply applying a predetermined voltage to one end of the hot cathode, which is the conventional practice, the intensity and density of the emitted electron beam in the length direction of the cathode increases. ) However, by applying a pulse voltage through a diode as in the present invention, an extremely uniform electron beam can be extracted by reducing the potential difference between both ends of the hot cathode to almost zero.

Figure 6 shows the density of the electron source shown in Figure 3.
The experimental results of ゛ are shown. Curves 40, 41 and 42 show the distribution of the electron beam flowing into the electrode 22 when the voltage applied to the cylindrical partition electrode 21 is changed.

Curves 40, 41 and 42 are applied to electrode 21 at -10V.

It shows the distribution when -20 and -30V were applied.

As can be easily understood from FIG. 6, as the voltage applied to the electrode 21 becomes more negative, the distribution of the electron beam becomes more concentrated in the center. This means that the equipotential surface within the cylindrical electrode 21 has a hanging-glass-like focused electric field (dashed line) toward the center.
This is due to the formation of

Therefore, the utilization rate of the electron beam emitted from the linear hot cathode can be significantly increased.

That is, 43 in FIG. 6 shows the distribution of the electron beam when the electrode 21 is not provided and the electron beam is extracted in the conventional manner. In this case, the electron beam cannot flow over the entire surface of the electrode 22, so only a small portion of the electron beam emitted from the cathode 2° can be used. By applying a potential, the sixth
As shown in the figure 16, -5, electron beam distribution 40, 41, 42, the minimum necessary electron beam can be generated, and the electron beam flows almost perpendicularly into the through hole 22a of the electrode 22. In order to
It is possible to improve the convergence of the electron beam and obtain an electron beam that is extremely convenient for improving resolution.

Control Electrode Section The electron beam control electrode section is composed of an electrode plate 22 for extracting the electron beam, a group of strip-shaped electrode plates 23, and a grid-shaped electrode plate 24. The strip-shaped electrode plates 23 are each insulated and arranged at 1.27 mm intervals, 81 of which are arranged perpendicular to the 16 linear hot cathodes 2o. Each strip-shaped electrode plate 23 and grid-shaped electrode plate 24 have a through hole 23a coaxially with the through hole 22a bored in the electrode plate 22.
and 24a are bored. The diameter of the through hole is 0.8
φ) and 0.6- were used. It is desirable that the interval between each electrode plate be as small as possible. Usually 0.3~0.
Maintained at 6van spacing. Each strip-shaped electrode plate 23
An image signal for one scanning line is sequentially applied to JP-A-58-12
9886 (5') is connected to the image signal circuit (see FIG. 7). A bias voltage sufficient to cut off the electron beam is applied to each strip-shaped electrode plate 23, and the amount of electron beam passing through is controlled by applying a positive image signal to each strip-shaped electrode plate 23. . A so-called electrode plate 23 performs a switching action. When applying an image signal to each strip-shaped electrode 23, the switching action and the actual speed of the passing electron beam change depending on the potential of the adjacent electrode, but in order to prevent these interactions, i'i, h Note 3 It is necessary to reduce the distance between the two electrodes. According to the experimental results, it has been revealed that if the distance between the three electrodes 22, 23, and 24 is kept equal to or less than the distance between the through holes, the influence of the potential of the adjacent electrodes is negligibly small.

Electron Beam Focusing Section A grid electrode 25, which constitutes an electron beam focusing section with grid electrodes 24 and 26, is substantially the same as the grid electrode 24.

The electron beam is collimated by both electrodes or focused by 17 t'-' by a potential difference applied between the two electrodes. Furthermore, an Einzel lens system can be constructed by inserting another electrode plate (not shown) between both electrodes. In any case, in order to focus the electron beam to the required beam diameter on the display surface 30, it is necessary to select the voltages to be applied to the grid electrodes 24 and 25, and at the same time to select the voltages to be applied to the grid electrodes 24 and 25. It is necessary to appropriately select the voltage to be applied. The energy of the electron beam incident on the next electron beam deflection electrode is determined by the voltage applied to the grid electrode plate 25, and an appropriate voltage is applied during vertical and horizontal deflection of the electron beam. There is a need to.

Electron beam deflection section The electron beam deflection section has 15 pairs of vertical deflection electrodes 26°26'
, 81 pairs of horizontal deflection electrodes 27, 2"7', and a grid electrode 28. 15 pairs of vertical deflection electrodes (are connected every other pair, and each 15 pairs simultaneously perform 16 steps of staircase wave deflection. A voltage is applied.Similarly, the 81 pairs of atomic deflection electrodes are also connected every other time, and three steps of staircase wave deflection voltages are simultaneously applied to each of the 81 pairs.Therefore, there are 240 x 243 pixels on the image display screen. As can be easily understood, if n-stage and m-stage staircase wave deflection voltages are applied to the vertical and horizontal deflection electrodes, respectively, 15n x 81m pixels can be obtained.Grid-shaped electrode Reference numeral 28 forms a pair with a metal back electrode 29 provided on the surface of the display panel 31 to constitute an electron beam accelerating electrode.
In order to cause the electron beam deflected by 7 to flow into a predetermined position on the display panel surface, 9. It serves to prevent the influence of high electric fields in the area from reaching the deflection electrodes. It is desirable that the grid electrode 28 has a high electron beam transmittance, but in order to eliminate distortion of the electron beam trajectory due to electric field distortion in the vicinity of the grid electrode 28, the hole diameter should be 0.3.
It is desirable that it be below K.φ. In the device of the present invention, the linear hot cathode 2o can be deflected in the axial direction, that is, in the horizontal direction, without using the electrode 27.

±2.6 in the vertical direction with the deflection electrode system described above.
By deflecting the light by +/-0.635 m in the horizontal direction (19 bases), it is possible to obtain an image with uniform brightness on the entire display surface.

When the voltages shown in Table 1 are applied to each electrode of the image display device described above, the electron beam current for the -scanning line is 1o○μ
A. The diameter of each beam was 0.2+mnφ, and a surface brightness of 150 fL was obtained when the entire surface was scanned at an acceleration voltage of 10 Kv.

Table 1 Vertical drive pulse voltage -13v partition electrode plate (21) voltage -10v beam extraction electrode (22) voltage 1ov horizontal drive pulse voltage
20 focusing electrodes (24) voltage
soV focusing electrode (25) voltage 180v
Vertical deflection voltage p-p 150V Horizontal deflection voltage p-1) 70V Grid shape as pole (
28) Voltage 200V accelerating electrode (29) Voltage
10 Kv Drive System The image display device of the present invention exhibits its effects most when used as a TV image display device.

An example in which this device is used as a TV image display device will be described below.

A conceptual diagram of the drive system for TV image display according to this embodiment is shown in the seventh figure.
As shown in the figure. This device has 15 vertical electron beam control electrodes (linear hot cathodes) and 81 horizontal electron beam control electrodes (rectangular electrodes). The display method is a one-scan line simultaneous display method that is generally implemented in matrix display devices. Further, as mentioned above, vertical and horizontal deflection electrodes are provided corresponding to the vertical and horizontal electron beam control electrodes.

In FIG. 7, the video signal input to the synchronization separation circuit 61 is transmitted to the control signal processing circuit 62 and the image 1 word processing circuit 63.
is input. In the image signal processing circuit 53, the image signal for one horizontal scanning line is decomposed into 486 signal sequences.
．． 7,13. ......, the 481st signal is stored in the storage device 54a, 2, 8, 14 degrees..., the 482nd signal,
The eye signal is stored in the storage device tsab, 6,1
2,18. ......, the 486th signal is stored in the 21 base storage device 4. sequentially stored in f. The image signals stored in each storage device are sequentially transferred to the horizontal drive circuit 56 via the switching circuit 56 in synchronization with the signal from the control signal generation circuit 52, and the image signal voltage is applied to the 81 horizontal electron beam control electrodes 23. applied.

At this time, if the scanning time of one horizontal scanning line is 63 .mu.s as in normal TV image display, then the signal voltage from each storage device is sequentially applied in increments of 10.6 .mu.B, which is % of one horizontal scanning time.

On the other hand, one of the signals sent from the control signal generation circuit 52 is input to the horizontal deflection drive circuit 67, and deflection voltages as shown in FIG. 8(a) are simultaneously applied to the 81 pairs of horizontal deflection electrodes 27. be done. As a result, for example, the first 10.6 μB time is shifted to the left by a maximum of 0.635 mm toward the display board surface, the next 10.5 μs time is shifted to the right by 0.425 mm, and the sixth 10.5 μB time is shifted to the right by a maximum of 0.635 mm. The time is up to 0.635 to the right
Apply a voltage that causes wn deflection. Repeat the above operations in sequence. The timing of this deflection is performed in synchronization with the switching circuit 66.

22 ゛Next, vertical scanning will be explained. In the case of normal TV image display, it is necessary to apply signal voltages sequentially from top to bottom every 63 μs. Assuming that the number of vertical scanning lines is 480, firstly, one
A negative signal voltage of 1/15 of the time of 16.6 ms for one frame, that is, about 1.1 ms, is applied via the vertical drive circuit 6o, and synchronously, the vertical deflection drive circuit 58
Vertical deflection voltages of 16 gradations as shown in FIG. 3(b) are applied to the vertical deflection electrode 26. For example, the first 63μS is a 2.64+n+n deflection in the upward direction, the next 63μs is a 2.202μs deflection, the following 1 s, os/1s is shifted downward, and the 16th 63μB is a 2.202μs downward deflection. .54m
deflect. 2nd, 3rd, etc...
.

The same operation is repeated for the 16th linear hot cathode to scan one field. Furthermore, for the next field, by superimposing the bias voltage for 5.08/32m+n deflection on the vertical deflection signal voltage, interlaced scanning can be performed and vertical scanning can be performed to warm the image for one frame. .

23, ... As is clear from the above description, the display device of the present invention can extract a uniform electron beam from the linear hot cathode, so that a clear image without unevenness can be obtained. Another image display device of the present invention that utilizes this for a flat panel image display device can obtain a high-resolution screen, and the number of electrodes can be significantly reduced compared to conventional ones, so that the driving speed is reduced. The circuit is simpler, cheaper, easier to implement, and the number of connection terminals is reduced, resulting in fewer failures.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the main configuration of a conventional flat panel display device;
The figure is an exploded perspective view of the main components of a display device according to an embodiment of the present invention, FIG. 3 is a wiring diagram when the electron source is pulse-driven in the device of the present invention, and FIG. Curve diagrams showing changes in the electron beam current flowing through each electrode when driven, FIGS. 6 is a conceptual circuit configuration diagram for explaining the driving method of the electron source in the case of electronic TV display in the present invention, and FIGS. 8(a) and (b) are horizontal and vertical deflection diagrams in the present invention. FIG. 3 is a diagram showing voltage waveforms and time relationships. 20... Linear hot cathode, 21... Partition electrode, 22... Electrode for extracting an electron beam, 22a. 23a, 24a...through hole, 23...
Strip-shaped electrode plate, 24... Grid-shaped electrode plate, 26,
26'...Vertical deflection electrode, 27.27'...
... Horizontal deflection electrode, 30 ... Fluorescent layer, 31
...Glass plate, 32...Diode,
33... Negative pulse voltage generator, 57...
. . . Horizontal deflection drive circuit, 58 . . . Vertical deflection drive circuit, 69 . . . Image display device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 1 (W-shaped 4 dais 4 & 2hht,

Claims (3)

[Claims] (1) A pulse signal generating means is connected to one end of the linear hot cathode and the other end thereof is connected to a power source for heating the linear hot cathode through a diode, and the pulse signal generating means causes the diode to generate a reverse current. An image display device characterized in that a pulse signal voltage is applied to the linear hot cathode so that the potential difference between both ends of the linear hot cathode is temporarily reduced to approximately zero. (2) A plurality of linear hot cathodes, partition means for partitioning the linear hot cathodes from each other, and a through hole provided along the axial direction of the hot cathode corresponding to each of the hot cathodes. Electrode means for extracting the beam1. Electron beam control electrode means comprising a plurality of electrodes having through holes substantially orthogonal to the hot cathode and corresponding to the through holes provided in the electrode from which the electron beam is taken out; electrode means for deflecting the electron beam; An image display device comprising electrode means for accelerating the electron beam and display means coated with a phosphor that emits light upon collision of the electron beam, and at least a display surface thereof is housed in a transparent glass container. A pulse signal generating means is connected to one end of the linear hot cathode, and the other end is connected to a power source for heating the linear hot cathode via a diode,
A pulse signal voltage is applied to the linear hot cathode by the Norculus signal generating means so that the diode generates a reverse current, and the potential difference between both ends of the linear hot cathode is temporarily reduced to approximately zero. image display device. (3) When the number of scanning lines on the display screen is divided by the number of linear hot cathodes n and the quotient is m (m is an integer), pulse signal voltage having a time width of m scanning lines is sequentially applied to n pulses. The image display device 0 (4) according to claim 2, wherein the voltage is applied to the linear hot cathode 0 (4), the quotient obtained by dividing the number of scanning lines on the display surface by the number n of linear hot cathodes is m( m is an integer), then m
A pulse signal voltage that changes in steps is applied to the electrode means for deflecting the electron beam in synchronization with the pulse signal voltage applied to the n linear hot cathodes.
The image display device according to claim 2, characterized in that: