JPH0619951B2 - Flat panel display - Google Patents

Description

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

Configuration of Conventional Example and Problems Thereof A basic configuration example of a conventional image display device will be described with reference to FIG.

This display element comprises a back electrode 1, a line cathode 2 as a beam source, a vertical focusing electrode 3, and a back focusing electrode 3 in this order from the rear to the front.
3 ', a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal deflection electrode 7, a beam accelerating electrode 8 and a screen 9 are arranged and configured, and these are flat glass bulbs (not shown). ) It is housed inside the evacuated interior.

Here, the vertical focusing electrode 3 serves as the electron beam extraction means, the beam flow control electrode 5 serves as the electron beam control means, the vertical and horizontal polarization electrodes 4 and 7 serve as the electron beam biasing means, and the screen 9 serves as the light emitting means.

A line cathode 2 as a beam source is stretched in the horizontal direction so as to generate an electron beam that is linearly distributed in the horizontal direction, and a plurality of such line cathodes 2 are vertically arranged at appropriate intervals (here, (Only four of 2a to 2d are shown). In this embodiment, 15 are provided. 2a to 2o. These wire cathodes 2 are formed by coating an oxide cathode material on the surface of a tungsten wire having a diameter of 10 to 20 μφ, for example. Then, as will be described later, the upper cathode 2a is controlled so as to emit an electron beam in order from the upper cathode 2a for a certain period of time (the back electrode 1 is controlled to emit the electron beam for a certain period of time, except for the linear cathode 2). Suppressing the generation of an electron beam from another wire cathode 2, and
Acts to push the generated electron beam only in the forward direction). The back electrode 1 may be formed by a coating film of a conductive material attached to the inner surface of the rear wall of the glass bulb. Further, instead of the back electrode 1 and the line cathode 2, a planar electron beam emitting cathode may be used.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2a to 2o. The electron beam emitted from the line cathode 2 is taken out through the slit 10 and vertically. Converged (the slits 10 may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through-holes arranged side by side at small horizontal intervals (intervals at which they almost contact). May be configured as a slit).
The vertical focusing electrode 3 is also the same.

A plurality of vertical deflection electrodes 4 are arranged in the horizontal direction at intermediate positions of the slits 10, and each of the vertical deflection electrodes 4 is formed by providing conductors 13 and 13 'on the upper surface and the lower surface of the insulating substrate 12, respectively. ing. Then, a vertical deflection voltage is applied between the conductors 13 and 13 ′ facing each other to deflect the electron beam in the vertical direction. In this embodiment, the electron beam from one line cathode 2 is vertically deflected by a pair of conductors 13 and 13 'to a position corresponding to 16 lines.
Then, the 16 vertical deflection electrodes 4 form 15 pairs of conductors corresponding to the 15 line cathodes 2, respectively, and eventually the electron beam is deflected so as to draw 240 horizontal lines on the screen 9. To do.

Next, each of the control electrodes 5 (each of which takes out the electron beam in the horizontal direction by dividing it into picture elements for one picture element and controls the passing amount according to a video signal for displaying each picture element) It is composed of a conductive plate 15 having a slit 14 which is long in the vertical direction, and a plurality of the conductive plates 15 are arranged in parallel in the horizontal direction at a predetermined interval. In this embodiment, 320 control electrode conductive plates 15a to 15n are provided (only 10 are shown in the figure). Therefore, the control electrode 5
If 320 lines are provided, 320 picture elements can be displayed per horizontal line. Further, in order to display an image in color, each picture element is to be displayed in a fluorescent body of three colors of R, G, B, and each control electrode 5 receives the respective image signals of R, G, B. Added sequentially. In addition, one of the 320 control electrodes 5 is
320 sets of video signals for lines are simultaneously added, and one line of video is displayed at one time. The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of 320 slits 16 which are long in the vertical direction and are opposed to the slits 14 of the control electrode 5, and emit an electron beam for each picture element divided in the horizontal direction. Each is focused horizontally to form a narrow electron beam.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 arranged in the vertical direction at the respective intermediate positions of the slits 16. A horizontal deflection voltage is applied between the horizontal deflection electrodes 7 for each picture element. Are polarized in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 9 to emit light. The deflection range is the width of one picture element for each electron beam in this embodiment.

The accelerating electrode 8 is composed of a plurality of conductive plates 19 horizontally provided at the same position as the vertical deflection electrode 4.
The electron beam is accelerated so as to strike the screen 9 with sufficient energy.

The screen 9 is configured by applying a fluorescent body 20 which is emitted by irradiation of an electron beam to the back surface of a glass plate 21 and adding a metal back layer (not shown).
The fluorescent body 20 is provided for each slit 14 of the control electrode 5, that is, for each one electron beam divided from the horizontal direction, one pair of fluorescent bodies of three colors of R, G, and B is provided. It is provided and is applied in stripes in the vertical direction.
In FIG. 1, the horizontal broken lines on the screen 9 indicate vertical divisions displayed corresponding to the plurality of line cathodes 2, and the vertical broken lines indicate the plurality of control electrodes 5. The division in the horizontal direction displayed corresponding to each is shown. As shown in an enlarged view in FIG. 2, one section divided by these two parts has R for one picture element in the horizontal direction,
There are G and B phosphors 20 having a width of 16 lines in the vertical direction. The size of one section is, for example, 1 mm in the horizontal direction and 16 mm in the vertical direction.

It should be noted that, in FIG. 1, the length in the horizontal direction is drawn to be much larger than that in the vertical direction for the sake of clarity.

Further, in this embodiment, only one set of R, G, B phosphors 20 for one picture element is provided for one control electrode 5, that is, one electron beam, but two or more picture elements are provided. Of course, two or more pairs of R, G, and B video signals for two or more picture elements are sequentially applied to the control electrode 5, and horizontal deflection is synchronized with them. Done.

The flat panel display device as described above has the following problems.

One of them is that, in the above-mentioned electrode structure, the accuracy of each electrode part and its assembly is partially different, but from several microns to 10
The requirement is about 0 μm. Particularly, there is a vertical deflection electrode or the like as a portion having a large assembly tolerance for landing of the electron beam. For example, if there is unevenness of 10 μm, unevenness of electron beam landing of about 20 to 30 μm occurs on the light emitting means surface, and the display quality is extremely deteriorated. As a correction means for preventing this, a new correction electrode means has been tried to be arranged, for example, adjacent to the vertical deflection electrode. However, the number of electrode means is increased, the price is increased due to the increase in the number of parts, and the number of assembly steps is increased. There was a problem such as price increase due to.

Still another problem is that since a linear electron source is used, a potential gradient due to the emission current from the electron source is always generated, and as a result, the unevenness of the electron beam landing on the surface of the light emitting means has the same potential. Appearing along the gradient,
It is to make the display quality extremely bad.

Still another problem is the deflection of the electron beam accelerating means to the counter electrode means side, which is generated by the Coulomb force.

Generally, the Coulomb force is a force that acts between two point charges q and q'which are stationary with a distance r, and when the force is F, F is directed in the direction of the bond line of the two and its magnitude. Is F∝
It becomes q '/ r ² .

Here, a concrete description will be given with reference to FIG. 1 which is a basic configuration example of a conventional image display element. In terms of electrostatic force (Coulomb force) acting between each electrode, the horizontal deflection electrode 7 and the acceleration electrode A potential difference of about 9 to 10 kV is generated between No. 8 and 8, and the largest electrostatic force (Coulomb force) is generated. Therefore, a large force attracting each other is generated, and the horizontal deflecting electrode 7 and the accelerating electrode 8 have a force to approach each other.

On the other hand, the horizontal deflection electrode 7 has a very strong rigidity because it is united with the beam flow control electrode 5 and the horizontal deflection electrode 6, which are other planar electrodes, by adhesion or the like, and is not bent by a small force.

On the other hand, since the accelerating electrode 8 is made of a thin plate electrode as shown in FIG. 1, it is extremely easy to bend in the plate thickness direction. Also, the long side of the plate is easier to bend than the short side,
The short side of the plate hardly bends. Further, the plate electrode 8 is fixed only at both ends thereof.

When the Coulomb force is generated between the horizontal deflection electrode 7 and the acceleration electrode 8 in such a case, the amount of deformation is extremely small, but the long side on the side of the horizontal deflection electrode 7 becomes convex so that it may approach the horizontal deflection electrode. And cause deformation. That is, when the accelerating electrode 8 is not plate-shaped but linear or ribbon-shaped, it has a larger convex shape, and the displacement of the landing (projection position) of the electron beam caused thereby becomes remarkable. Specifically, along the longitudinal direction of the electron beam accelerating means, the plurality of electron beam projecting positions which are arranged in a projecting manner on the light emitting means have different collision positions corresponding to the deformation of the acceleration electrode 8. It will be displaced to.

From this, the problem is that when the electron beam accelerating means is linear or ribbon-shaped, it is linear due to the Coulomb force generated between the opposing electrode means having a lower potential. Alternatively, the ribbon-shaped electron beam accelerating means is 50 to 30.
The deflection is about 0 μm, so that the unevenness of the electron beam landing appears and the display quality is extremely deteriorated.

OBJECT OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and provide a higher quality display at a lower cost by providing an electron beam accelerating means with an electron beam projection position correcting means. It is in. Still another object is to provide the electron beam accelerating means with an electron beam correcting means such as a correction by a potential gradient of a linear electron source and a deflection of a linear or ribbon electron beam accelerating means. It is to solve the problems and provide higher quality display at lower cost.

Structure of the Invention In order to achieve the above-mentioned object, the present invention is characterized in that a display device is structured as follows.

The flat panel display device includes a linear electron source, an electron beam control means, an electron beam deflection means, and an electron beam acceleration means having an electron beam projection position correction means.

Description of Embodiments One embodiment of a flat panel display device of the present invention is shown in FIGS.
c, FIG. 4 a, b, c, d, e, f, and FIG. FIGS. 3a, 3b, and 3c are partial configuration diagrams in which only electrode portions necessary for explaining one embodiment of the present invention are partially extracted from FIG. 4A to 4F and FIG. 5 are partial perspective views showing several kinds of embodiments in which the electron beam accelerating means is provided with the electron beam projecting position correcting means.

Before describing the embodiments of the flat panel display device of the present invention, the meaning of "contribution rate" used in the following description and the principle of calculation and correction thereof will be described.

First, the meaning of the contribution rate and its calculation will be described.

In the flat panel display device of the present invention, an electrode group as a display device is formed by assembling planar electrodes, plate electrodes, linear electrodes and the like. A CRT electron gun normally forms three electron beams and scans the front surface of the screen to form an image. The electron gun of this CRT is an extremely small part in terms of the area of the entire screen.

However, the electron gun of the present invention has an area corresponding to the entire screen, and it is formed by stacking a plurality of sheet-like electrodes, arranging them vertically, or by stretching linear electrodes. It is a large component with a very large area.

Therefore, even if the electron beam passage holes are aligned at one end, the electron beam passage holes are occasionally not aligned at the other end because of the large-area laminated structure.

Therefore, if the shape of the electron beam passage hole and the assembly position accuracy are different in each place, the electron beam flies along a trajectory deviated from a predetermined trajectory according to the electric field formed accordingly.

Therefore, how much the electron beam landing (electron beam projection position) is shifted when the electrodes are slightly displaced in this flat panel display device is calculated by experiments and simulations. To do.

In the experiment, one arbitrary electrode is intentionally installed diagonally on the actual panel, and the displacement amount of each electrode from one end to the other end is compared with the displacement amount of the electron beam landing.

The amount of electrode displacement is measured with a microscope in advance, the position of the electron beam spot is measured with a television camera having a large magnification when the panel is turned on, and how much the landing is displaced when the electrode is displaced by 100 μm, for example, is calculated. The value obtained by dividing the value by 100 μm is the contribution rate. That is, it is possible to know how much the electron beam landing position deviates from the normal position if the amount of electrode displacement is known.

In this way, the contribution rate in the case where only one electrode is deviated from the normal position is calculated, and it is calculated for all the electrodes. Of course, the electron beam landing position may be displaced in the direction opposite to the direction in which the electrodes are moved, so positive and negative signs are given. By doing so, it has been experimentally confirmed that the position of the electron beam can be calculated by simply adding even if several electrodes actually move.

For example, in FIGS. 6 (a) and 6 (b), when the lower electrodes of the pair of vertical deflection electrodes 64 corresponding to the vertical deflection electrodes 4 in the configuration of FIG. Is about 100 μm in the same direction when a contribution ratio of about 2.5 calculated in advance at the time of maximum vertical deflection of the electron beam is applied, and a landing shift occurs along the concave curve.

This can be understood logically. For example, when the pair of deflection electrodes are assembled accurately without bending, when the electron beam 60 is incident without the deflection voltage being applied, the electron beam 60 advances straight to the screen 69.

However, when the electron beam 61, which should originally travel in a straight line, enters (when no deflection voltage is applied), the electron beam 61 is made to have a convex shape due to the electric field formed by the vertical deflection electrode 4 deflected in the Y direction. It will be deflected toward the central axis of the bent state. In other words, the landing will be shifted by 100 μm from the straight line where it should normally proceed.

Next, the principle of correction for correcting the landing deviation will be described in detail.

The above-mentioned landing deviation is caused by, for example, as shown in FIG. 3 (a) which is an embodiment of the present invention, the shape of the electron beam accelerating electrode 8 in the Z direction is 200 μm on the long side of the vertical deflection electrode 4.
It is possible to correct this landing deviation by deforming into a concave shape. In other words, in the lateral direction of the electron beam accelerating electrode 8 (Y axis or Z axis in FIG. 3 (a)).
The cross-sectional shape in the axial direction is rectangular, but the longitudinal direction (Fig. 3).
Since the cross-sectional shape is not the same along (a) in the X-axis direction), the electric field formed along the longitudinal direction is a non-uniform electric field. The electron beam landing shift is corrected by this non-uniform electric field. Further, this makes it possible to correct the respective projecting positions of a plurality of electron beams projecting and arrayed on the light emitting means along the longitudinal direction of the accelerating means (the embodiment of FIG. 3 will be described in detail later). Explained).

This correction principle is based on the case where the position of the acceleration electrode 8 in the Z direction is extremely close to the horizontal deflection electrode 7 side and the screen 9
It can be qualitatively understood by considering the case where the accelerating electrode 8 is a linear electrode.
An explanation will be given using (a), (b), and (c).

FIG. 7 (a) is a diagram showing an equipotential curve 70 when the linear acceleration electrode 8 is in the standard position.

When the position of the accelerating electrode 8 in the Z direction is brought closer to the horizontal deflection electrode 7 side as shown in FIG.
V, when several hundreds of V is applied to the horizontal deflection electrode 7, the electric field formed there is an extremely strong electric field, and when the horizontal deflection electrode 7 is viewed from the accelerating electrode 8 side, the equipotential curve around it is A large deep concave curve 74 will be drawn very densely.

That is, the electron beam 72 that has passed through the horizontal deflection electrode 7
Receives an extremely large force because it tries to enter perpendicularly to the equipotential curve, and is deflected more than necessary.
Here, the electron beam 71 shows the standard orbit at the time of deflection in the configuration of FIG.

On the other hand, when the position of the acceleration electrode 8 in the Z direction is brought closer to the screen 9 side as shown in FIG. 7 (c), the electric field formed by the acceleration electrode 8 and the horizontal deflection electrode 7 is different from that in the above case. It becomes an extremely weak electric field, and when viewed from the same direction as above, the equipotential curve around it becomes a small shallow concave curve 75,
The density will be drawn thin.

That is, the electron beam that has passed through the horizontal deflection electrode 7 is less affected by the electric field formed there, and further advances toward the screen with only a slight force to deflect it. Near the screen 9, it is strongly affected by the electric field formed by the horizontal deflection electrode 7, the acceleration electrode 8 and the screen electrode 9, but at that time, the electron beam has already reached the vicinity of the screen 9 and has a great influence on the landing. Without reaching the screen 9.

In the present invention, the above idea is based on the acceleration electrode 8
Will be reflected in the shape of. That is, if large deflection is required, the position of the acceleration electrode 8 should be brought closer to the horizontal deflection electrode 7,
If it is not desired to deflect too much, it suffices to move away from the horizontal deflection electrode 7.

Next, the present invention will be described in detail based on specific examples.

Reference numeral 31 in FIG. 3 (a) is for correcting the assembling accuracy of each electrode, and as the electron beam correcting means when the vertical deflection electrode 4 having a particularly high accuracy is deflected, the shape of the electron beam acceleration electrode is the deflection of the vertical deflection electrode. It is one embodiment configured in a shape corresponding to (i.e., substantially deformed). When the vertical deflection electrodes 4 as shown in FIG. 3 (a) are flexed by 40 μm in the Y direction so that they approach each other in the vicinity of their centers, they are calculated in advance at the time of maximum vertical deflection of the electron beam. When a contribution rate of about 25 is applied, a maximum of 100 μm is generated in the bending direction of the vertical deflection electrode 4, and a landing shift occurs along the bending curve. That is, when such a deflection occurs with respect to a plurality of electron beam projecting positions that are arranged to project toward the light emitting means when the deflection is not originally caused,
An electron beam landing deviation occurs corresponding to the curve of this deflection. In order to correct this deviation, it is possible to prevent the occurrence of landing deviation by deforming the shape of the electron beam accelerating electrode 8 in the Z direction so that the long side portion on the side of the vertical deflection electrode 4 is concave to 200 μm.

That is, in the vicinity of the center of the concave shape along the long side direction of the acceleration electrode 8, the position is relatively far from the horizontal deflection electrode 7 as compared with the vicinity of both ends, and conversely the horizontal deflection is performed as the both ends are approached. The position is close to the electrode 7. Therefore, the deflection of the electron beam is slightly suppressed in the vicinity of the center of the concave shape along the long side direction of the acceleration electrode 8, and the deflection is slightly increased as it approaches the both ends. Here, the contribution ratio of the electron beam landing deviation on the screen surface to the deviation of the vertical deflection electrode 4 in the Y direction is about 2.5. Further, the similar contribution rate to the displacement of the acceleration electrode 8 in the Z direction is about 0.5, and this reproducibility is extremely good, and falls within a value of 0.48 to 0.52. However, for example, the contribution ratio of the vertical deflection electrode 4 to the displacement in the Y direction is in the range of 2.3 to 3.0, and the reproducibility is not very good. This is because the electric field around the acceleration electrode located immediately before the screen does not change significantly. This is because the screen is a solid container or a glass plate, and the horizontal deflection electrode is synthetic and is therefore difficult to deform. on the other hand,
Since the vertical deflection electrode is built in the electrode group, it is greatly affected by the assembly accuracy, and the reproducibility of the contribution ratio is deteriorated. Of course, the contribution to the displacement of the accelerating electrode depends on the position of the accelerating electrode in the electrode configuration,
Alternatively, the contribution ratio value of 0.5, which varies greatly depending on the voltage value, is about 0.3 to 1 when the position of the accelerating electrode is 2 to 3 mm or when the accelerating voltage is increased from 10 KV to 20 KV. ．
It will change to 5 mag.

From the above, if the correction means is integrally formed with the acceleration means having extremely good reproducibility, a higher quality display can be obtained. Also, in the figure, the dotted line is the shape when there is no bending or shape change, and the solid line with an arrow is the flow of the electron beam.

Reference numeral 32 in FIG. 3 (b) indicates a shape of the electron beam accelerating electrode corresponding to the curve of the potential gradient as a means for correcting the electron beam shift on the screen surface due to the potential gradient generated by the emission current of the linear cathode 2. It is an embodiment of a configuration in which the electron beam accelerating means is integrated with the electron beam accelerating means. For example, if both ends of the line cathode 2 are set to the same potential when the emission current is generated,
Alternatively, the potential curve of the line cathode 32 varies depending on whether one end is kept at a constant potential. The potential difference between the potential at one end of the line cathode 2 and the potential at each point in the length direction (x direction) of the line cathode is ΔV.
33 is a potential curve of the line cathode when the position at each point is taken as the horizontal axis (x direction). Curve 34
Is a potential curve when both ends of the wire cathode are set to the same potential,
A curve 35 is a potential curve when one end of the line cathode is fixed potential. The accelerating electrode 8 in FIG. 3b is deformed into a concave shape corresponding to the case where the potential curve of the line cathode 2 is the curve 34. In this case, the potential difference in the wire cathode is about 0.5V
If it occurs to some extent, the deviation of the electron beam on the screen surface becomes about 40 μm. To correct this, the acceleration electrode 8
Is deformed into a concave shape of about 80 μm.

36 in FIG. 3 (c) is an electrode facing the accelerating electrode 8 and is composed of the Coulomb force generated between the horizontal deflection electrode 7 and the accelerating electrode 8 and the force such as the tension of the accelerating electrode 8 itself. As an electron beam correcting means when the accelerating electrode 8 is bent, an electron beam accelerating means is formed by deforming the shape of the electron beam accelerating electrode into a shape corresponding to the bending due to the cause.

Here, tension generated in the acceleration electrode 8 and bending
This will be described with reference to FIGS. Figure 8 (a) shows the acceleration electrode 8.
FIG. 3 is a perspective view showing a fixed form of FIG. FIG. 8 (b) is a sectional view thereof. Reference numeral 81 is a frame body for fixing the accelerating electrode 8.
Reference numeral 82 is a metal wire for generating tension in the electrode 8.
That is, when fixing the accelerating electrode 8 to the frame 81, when the metal is placed on the metal wire 82 and both ends are pressed in the direction of the arrow 83 and welded to the frame 81, tension is generated in the accelerating electrode 8 and the accelerating electrode 8 It will bend in a curved shape as shown by the dotted line.

If the accelerating electrode 8 is simply provided without the metal wire 82, the surrounding frame 8
When welded to No. 1, the accelerating electrode 8 vibrates vertically and becomes unstable even with slight vibration. Metal wire 82 to prevent it
It is necessary to take a fixed structure using. This is a mere example, and various other structures are possible.

When the accelerating electrode 8 is flexed by Coulomb force or the like by about 100 μm, the accelerating electrode 8 may be deformed by about 100 μm in the opposite direction as shown in FIG. If the accelerating electrode 8 is simply welded to the frame 81 without the metal wire 82, the horizontal deflecting electrode 7 is about 500 V
When a normal voltage of about 10 KV is applied to the accelerating electrode 8, the accelerating electrode 8 is moved to the horizontal deflection electrode 7 side by about 10
It will bend by 0 μm. However, when the structure shown in FIG. 8 is taken, the device is preliminarily bent in the opposite direction and installed by about 100 μm, so that it returns to the normal position when a voltage is applied, and the landing deviation of the electron beam can be corrected. Further, although not shown in the figure, the potential gradient of the linear cathode and the Coulomb force between the accelerating electrode and the counter electrode are usually generated at the same time. Can be corrected at the same time by transforming into a shape corresponding to the contribution ratio of the two.

In addition, as a correction means based on the shape of the acceleration means, FIG.
It is also possible to correct various shapes as shown in each of (a) to (f). When the accelerating means is in the form of a wire, reference numeral 41 is for performing correction with a shape in which the center is thinnest and both ends are thicker. 42 has the same shape as the accelerating electrode 8 shown by 31 in FIG. 3a and 32 in FIG. 3b. Four
3 is for correcting with a shape corresponding to the curve 35 shown by 32 in FIG. 3b. Reference numeral 44 indicates a shape in which the acceleration electrode 8 is vertically symmetrical (up and down in the drawing). This ensures sufficient accuracy when the acceleration electrode 8 is assembled into the panel, and can be inserted upside down or upside down. It helps to improve the yield in a good form. 45 is a correction method when the acceleration electrode 8 has a structure in which an electrode portion (hatched portion) is attached on an insulating substrate. 46
When the accelerating electrode 8 is thin and unstable, the shape in the thickness direction is deformed so that the accelerating electrode 8 can be stably manufactured.

This will be specifically described with reference to FIGS. 9 (a), (b) and (c). 9th
Figure (a) is the acceleration electrode shown in Figure 4 (f). 9 (b) and 9 (c) show how the equipotential curve changes when the thickness in the direction of arrow 91 shown in FIG. 9 is changed. As shown in this figure, it can be seen that the amount of change in the equipotential curve changed to the concave shape is different even if the thickness is changed without changing the position of the acceleration electrode arranged between the horizontal deflection electrode 7 and the screen 9.

That is, it can be seen that B having a large acceleration electrode has a large amount of change in the equipotential curve and has substantially the same effect as when the acceleration electrode is brought closer to the horizontal deflection electrode 7. On the contrary, when the thickness of the accelerating electrode is thin C, the amount of change in the equipotential curve is small, and it can be seen that there is substantially the same effect as when the accelerating electrode is brought close to the screen 9 side.

Another embodiment is shown in FIGS. 5 (a), (b), (c) and (d).
This is because the accelerating electrode 8 is formed on the insulating substrate 51 as shown in FIG.
It is formed by a structure in which a conductive film 53 having a high resistance is attached.

Basically, by attaching a high resistance thin film to the accelerating electrode and giving a potential difference to the central part or an arbitrary part and both ends, the accelerating electrode itself can form an arbitrary potential gradient,
It is intended to deal with various corrections.

A voltage must be applied to give a potential difference.

On the other hand, the accelerating electrode 8 is located between the horizontal deflection electrode 7 and the screen 9, and when the electrode for directly applying the voltage is taken out from the center of the accelerating electrode, the peripheral electric field is disturbed and the electron beam trajectory is changed. Resulting in.

Therefore, it is necessary to form the conductive film 52 in a T shape as a means for applying a voltage to the center of the acceleration electrode so that the voltage can be applied from the end of the acceleration electrode. Further, in order to give a potential difference, a voltage may be directly applied to both ends of the high resistance conductive film 53.

When a voltage is applied to the high resistance conductive film 53 through the conductive films 52 and 54 in this manner, the surface voltage of the accelerating electrode 8 is along the long side direction of the accelerating electrode as shown in FIG. As a result, a convex or concave voltage curve is drawn.

Therefore, the correction effect can be confirmed by drawing an equipotential curve composed of the horizontal deflection electrode 7, the acceleration electrode 8 and the screen 9 as shown in FIGS. 5 (c) and 5 (d). . That is, FIG. 7C shows the case where the central portion of the accelerating electrode has a higher voltage than both ends. In this figure, since the voltage of the acceleration electrode 8 is high, a strong electric field is generated between the horizontal deflection electrode 7 and the acceleration electrode 8, and the equipotential curve forms a deep concave curve.

This brings the same effect as if the position of the accelerating electrode 8 is brought closer to the horizontal deflection electrode 7 side. The electron beam thus deflected is further deflected.

On the other hand, the electric field state when both ends of the accelerating electrode have a lower voltage than the central part is shown in FIG. In this figure, since the voltage of the acceleration electrode 8 is low, a weak electric field is generated between the horizontal deflection electrode 7 and the acceleration electrode 8, and the equipotential curve forms a shallow concave curve.

This means that the position of the accelerating electrode 8 is changed to the screen 9
It will have the same effect as getting closer to your side.
As a result, the electron beam that has been deflected is suppressed from being further deflected.

These are merely examples, and it goes without saying that the electrodes for applying a potential difference do not necessarily have to be installed at the central portion and both end portions and can be set arbitrarily. Further, the potential difference can be varied sufficiently. Further, it is possible to select various voltage curves by changing the film thickness of the high resistance thin film.

In this structure, if the assembly accuracy of each electrode, the potential gradient of the wire cathode, the deflection due to the Coulomb force and the tension between the accelerating electrode and the counter electrode, etc. are difficult to estimate, use a thin film of Au, for example. The conductive film 52 and In ₂ having high resistance
The potential difference between the both ends of the conductive film 53 formed of O _{3 can} be appropriately adjusted from several tens of volts to several hundreds of volts to set the voltage value having the most correction effect, and the correction can be performed.

Further, the conductive film 52 having a low resistance is arranged in the upper part in the drawing, but it may be arranged in the lower part or in the substrate.

EFFECTS OF THE INVENTION As described above, by providing the electron beam accelerating means with the electron beam correcting means, there is an effect that a higher quality display can be easily manufactured at a fixed price. Moreover, there is an effect that the accelerating means can be manufactured at a lower cost by extremely simple shape deformation. Further, by using the accelerating means having a structure capable of changing the accelerating voltage, various cases can be corrected from the outside of the panel, so that there is an effect that the production yield of the panel can be improved and the number of steps can be reduced. In addition, since the potential gradient of the linear electron source has a predetermined deviation, there is an effect that correction can be performed with extremely high accuracy. The deviation between the acceleration means and the counter electrode due to the generation of the Coulomb force also has a predetermined deviation, so that the correction can be performed with extremely high accuracy.

Since the two parties can estimate the occurrence of the predetermined deviation, there is an effect that the correction can be performed with extremely high accuracy at the same time.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a flat panel image display device,
FIG. 2 is an enlarged view of the screen of the device, FIG.
b and c are main part configuration diagrams of the flat panel image display device according to one embodiment of the present invention, and FIGS. 4 a, b, c, d, e, and f are
5A, 5B, 5C, and 5D are perspective views of a main part of a flat panel image display device according to another embodiment of the present invention, and FIGS. A perspective view, a voltage curve diagram, an equipotential curve diagram, and FIGS. 6a and 6b are a perspective view and an electron beam trajectory diagram, respectively, for explaining the principle of the present invention, and FIGS. For the purpose of explaining the principle of the present invention, a cross-sectional view of an essential part, an equipotential curve diagram, and an electron beam trajectory diagram, and FIGS. 8A and 8B are a perspective view and a sectional view of an essential part for fixing an accelerating electrode. 9 a, b and c show the fourth
FIG. 9 is a perspective view of a main part and an equipotential curve diagram for detailed description of FIG. 2 ... Line cathode, 4 ... Vertical deflection electrode, 7 ... Horizontal deflection electrode as counter electrode of acceleration electrode, 8 ... Acceleration electrode.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoma Hirano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hiroyuki Nagashima, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd

Claims (5)

[Claims] 1. A linear electron source, an electron beam control means for controlling an electron beam emitted from the electron source, an electron beam deflecting means for deflecting the electron beam, and an electron beam accelerating means for accelerating the electron beam. An electron beam emitting means for emitting light by the electron beam impact, wherein the electron beam accelerating means is provided with a plurality of electron beam impact positions arrayed in the light emitting means along the longitudinal direction of the accelerator means. A flat panel display device characterized in that it is also provided with electron beam impingement position correcting means for correcting each. 2. The electron beam accelerating means is provided with electron beam impinging position correcting means by making the cross-sectional shape of the electrode in the lateral direction of the electron beam accelerating means different from each other at arbitrary positions in the longitudinal direction. The flat panel display device according to claim 1, wherein 3. A high resistance thin film is formed on an electron beam accelerating means, and different accelerating voltages are applied to two or more portions of an arbitrary portion including an end portion of the thin film so that a potential difference is exerted on the thin film. The flat panel display device according to claim 1, further comprising an electron beam impingement position correction means for generating a beam. 4. The flat panel display device according to claim 1, wherein the electron beam correction relating to the potential gradient of the linear electron source is performed by an electron beam accelerating means. 5. The electron beam accelerating means is a linear or ribbon electrode, and the counter electrode means of the linear or ribbon electron beam accelerating means by Coulomb force generated between the electrode means facing the linear or ribbon electrode. 3. The flat panel display device according to claim 1, wherein the electron beam accelerating means corrects the deflection of the electron beam toward the side.