JPH0528937A - Flat display - Google Patents

Abstract

PURPOSE:To enhance the efficiency of light emission so as to provide high resolution by applying voltages to the electrodes of a first control electrode group correspondingly to application of a deflecting voltage to a deflecting electrode, and applying voltages to a second control electrode group correspondingly to information about the brightness of images. CONSTITUTION:Thermoelectrons are emitted as an electron beam B from a linear hot cathode 151 while being distributed like a sheet of uniform width equal to the length of the cathode 151 adjusted to predetermined thickness by a focusing electrode 155 and are allowed to horizontally progress between a deflecting electrode group 13 and a control electrode plate 14. Then a first control electrode group 142 act as a scanning electrode, deciding lines in the direction in which the beam M progresses. Thermoelectrons emitted from a small number of electron sources 15,17 are effectively used to control voltages applied to the electrode group 13, the first control electrode group 142 and the second control electrode group 143 and those thermoelectrons which correspond to a position at which light is emitted are precisely selected and allowed to pass through an electron through hole 14X located at that position, and are precisely applied to a fluorescent screen 12 serving as an object from which to emit light.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional display device of this type, a display device shown in FIGS. 8A and 8B described in Japanese Patent Laid-Open No. 184239/1988 is known. In FIG. 1A, 1 is a linear hot cathode that is connected to a support and emits electrons when energized, and 2 is a perforated cover electrode with a semi-elliptical cross section that covers the upper surface of the linear hot cathode 1. , The linear hot cathode 1 and the perforated cover electrode 2 constitute an electron emission source 40,
The perforated cover electrode 2 has a large number of small holes 3 shown in FIG. 1B, so that the electrons extracted from the linear hot cathode 1 pass through the small holes 3 by applying an appropriate potential. It has become.

Numeral 4 is excited by collision of electrons emitted from the electron emission source 40 and emits red, green and blue light.
Seed phosphor is coated on the inner surface in a dot shape, and phosphor surface 5
And an aluminum film (not shown) for providing conductivity on the phosphor surface 5 of the front glass.
By applying a voltage of about 10 to 30 KV to the aluminum film, electrons are accelerated to excite the phosphor on the phosphor surface 5 to emit light.

Reference numeral 6 denotes the front glass 4 and the linear hot cathode 1.
A control electrode that is interposed between the front glass 4 and the perforated cover electrode 2 to pass or block the electrons toward the front glass 4 as shown in an exploded perspective view in FIG. A strip having an insulating substrate 8 having electron passage holes 7 corresponding to the pixels made of the above phosphor, and electron passage portions 9B arranged corresponding to each row of pixels on the surface of the insulating substrate 8 on the electron emission source side. Strips having a first control electrode portion 9 formed of a metal electrode 9A in the shape of a stripe and an electron passage portion 10B similar to the first control electrode portion 9 and arranged corresponding to each row of pixels on the surface of the insulating substrate 8 on the phosphor surface 5 side. The second control electrode section 10 is formed of a metal electrode 10A in the shape of a circle. The first control electrode portion 9 and the second control electrode portion 10 are formed in a mesh shape in which a large number of small holes 11 are formed in the portions where the electron passage portions 9B and 10B correspond to the electron passage holes 7 of the insulating substrate 8. Has been formed.

Although not shown, the periphery of the front glass 4 extends further downward while curving, is closed under the back electrode, and the inside is kept in a vacuum. Each electrode is electrically connected to the outside from a sealing portion provided on the side surface.

Next, the operation will be described. Linear hot cathode 1
The thermoelectrons emitted from the are extracted by the perforated cover electrode 2 to which a high voltage of about 5 to 30 KV is applied with respect to the voltage applied to the thermoelectrons, and are arrayed in multiple rows in the direction orthogonal to the linear hot cathode 1. One of the first control electrodes 9 including the metal electrodes 9A arranged side by side has about 2 with respect to the potential of the linear hot cathode 1.
By applying a positive potential of 0 to 40 KV, thermoelectrons are attracted to this electrode and reach the control electrode 6.
In addition, the average voltage applied during the operation of the linear hot cathode 1 is set to 0V as a reference voltage. Perforated cover electrode 2
Of the electron on the front surface of any one metal electrode 9A of the first control electrode section 9 by adjusting the semi-elliptical shape of the above, the position of the first control electrode section 9, and the voltage applied to each metal electrode 9A. The density is almost uniform.

Although the operation of the control electrode 6 is not described in the above publication, the control electrode 6 is, for example,
JP-A-62-172642 and JP-A-1-126
It is considered that the operation is similar to that of the general matrix type display described in Japanese Patent No. 688 or the like. Therefore, this operation will be described below with reference to these publications.

If only one metal electrode 9A of the first control electrode portion 9 has a positive potential and the other has a potential of 0 V or a negative potential, the thermoelectrons emitted from the linear hot cathode 1 have this positive potential. It is attracted only to one metal electrode 9A, passes through the electron passage hole 9B, and enters the corresponding electron passage hole 7 of the insulating substrate 8. Then, all the electrons that have entered the electron passage hole 7 do not pass through to the front glass 4 side as they are, but of the second control electrode portion 10 disposed above the electron passage hole 7, for example, 40 to 100 V Electrons pass only through the electron passage holes 10B of the metal electrode 10A to which an electric potential is applied, and do not pass through other electron passage holes 10B of the metal electrode 10A having a potential of 0 V or a negative potential, and stay inside the electron passage holes 7. .. Therefore, one metal electrode 9 in the ON state to which a positive potential is applied is included in the first control electrode unit 9.
Electrons pass only through the electron passage hole 7 at the intersection of A and the metal electrode 10A of the second control electrode portion 10 to which a positive potential is applied. Then, the passing electrons cause the phosphor 5 at the position of the pixel corresponding to the electron passing hole 7 to emit light, and the screen display is performed. Therefore, the desired image display is performed by controlling the potential application to the metal electrodes 9A and 10A so that the above intersections correspond to the desired positions. For example, the metal electrodes 9A of the first control electrode unit 9 are sequentially scanned one by one to be turned on, and the metal electrodes 1 in the second control electrode unit 10 corresponding to the positions where the metal electrodes 9A are to emit light in synchronization therewith.
0A is turned on, and this is repeated at a cycle not perceivable by human eyes, for example, 60 screens per second (scan).
As a result, the image is displayed.

As shown in FIG. 9B, the electron passage holes 9B and 10B of the control electrodes 9 and 10 corresponding to the electron passage holes 7 of the insulating substrate 8 have a mesh shape with a large number of small holes 10C formed therein. Are formed in the electron passage holes 9B, 10B when they are turned off so as not to pass electrons.
B It is necessary to generate an electric potential that blocks electrons as a whole, and is to allow the passage of electrons to be blocked by applying a small negative potential of 0 V to several tens of V to each control electrode unit 9, 10. ..

The brightness of each pixel is determined by the second control electrode section 1
It is controlled by the time during which each metal electrode 10A of 0 is turned on. That is, the on-state time of the first control electrode unit 9 is t
If y is set to a pixel at a predetermined position with P% luminance,
The metal electrode 10 of the second control electrode portion 10 corresponding to the position
A in ON state t _x may be the Pt _y / 100.

Another flat-panel display device is shown in FIG. 10 described in JP-A-60-89041. This display device has face plates 41A facing each other,
A sealed container 41 having a high degree of vacuum having 41B is provided, and a phosphor surface 42 is provided on the inner surface of the face plate 41B.
The other face plate 41A is provided with a deflection electrode 43 composed of a plurality of stripe-shaped parallel electrodes extending in one direction so as to face the phosphor surface 42, and a modulation electrode group 44 is provided between the phosphor surface 42 and the deflection electrode 43. ing. The back electrode 45, the linear hot cathode 46, the beam extraction electrode 47, the prefocus electrode 48, the focus electrode 49, and the shield electrode 50 are arranged so as to extend along the surface direction of the phosphor surface 42.

Further, the electron beam 51 emitted from the linear heat electrode 46 goes straight between the deflection electrode 43 and the modulation electrode group 44 while being focused by the focus electrode 49. Since most of the deflection electrodes 43 and the voltage of the modulation electrode group 44 on the side of the deflection electrode 43 are equal, the electron beam 51 is generated in the vicinity of the deflection electrode 43y to which a low voltage different from that of the modulation electrode group 44 of the deflection electrodes 43 is applied. To the modulation electrode 44 side due to the electric field near the deflection electrode 43y. The electron beam incident on the modulation electrode group 44 is modulated for each pixel by the electrode on the phosphor surface 42 side of the modulation electrode 44, then accelerated, and reaches the phosphor surface 42 to emit light.

[0013]

However, in the flat panel display device described in the former publication, only one metal electrode 9A is turned on in the first control electrode group 9, and the other metal electrode 9A is used. Is in the off state, the electrons are emitted from the linear hot cathode 1, pass through the perforated cover electrode 2, and pass through the electron passage hole 7 of the electrons toward the first control electrode portion 9, and contribute to light emission. The ratio of electrons that can be generated is very small. For example, in a normal television signal (NTSC signal), since there are about 490 scanning lines, only 1/490 of the scanning lines are used, and there is a problem that the utilization efficiency is not sufficient. there were.

On the other hand, in the flat-panel display device described in the latter publication, although the utilization efficiency of electrons is high, it is difficult to accurately control the thickness and arrival position of the electron beam. The energy of the electron beam must be increased, and then the deflection electrodes 43 group and the modulation electrode 44
There is also a problem that the driving circuit becomes expensive because it is necessary to increase the voltage for driving the.

The present invention has been made in order to solve the above-mentioned problems. By utilizing electrons as effectively as possible for light emission on the phosphor surface and accurately applying electrons to the phosphor surface,
It is an object of the present invention to provide a flat-panel display device that can emit light with high efficiency and can obtain high resolution.

[0016]

A flat-panel display device according to the present invention is provided with a plurality of phosphor surfaces provided in a part of the inner surface of a hermetically sealed container kept in a high vacuum, and a plurality of them arranged in parallel at a position facing the phosphor surface. A deflecting electrode, a surface insulating substrate interposed between the deflecting electrode and the phosphor surface and having a plurality of electron passage holes, and a plurality of surface insulating substrates arranged in parallel on the deflecting electrode side surface of the surface insulating substrate. A first control electrode, to which a voltage is applied so as to control electrons passing through the through hole, and a plurality of first control electrodes are paired and arranged in parallel on the surface of the surface insulating substrate on the phosphor surface side in pairs. By applying a voltage between the second control electrode to which a voltage is applied so as to control the electrons passing through the electron passage hole and the surface insulating substrate having both of these control electrodes and the deflection electrode, Has multiple electron passage holes that pass electrons and guide them to the first control electrode side. The first control includes a guide electrode and a pair of electron sources provided in the space between the guide electrode and the deflecting electrode so as to be close to both side surfaces of the sealed container and parallel to the first control electrodes. For the electrodes of the electrode group,
In response to the application of the deflection voltage to the deflection electrodes, a voltage that sequentially turns on one by one is applied to deflect the electron beams emitted from the pair of electron sources to the first control electrode side in the on state, and A voltage corresponding to the brightness information of the image is applied to the second control electrode group so that electrons pass through the electron passage holes.

[0017]

According to the flat display device of the present invention, when sheet-shaped electron beams are emitted from a pair of electron sources, these electron beams enter between the deflection electrode and the guide electrode and become parallel to the display screen. At this time, a voltage is applied to the plurality of first control electrodes so as to sequentially turn on one by one in response to the application of the deflection voltage to the deflection electrodes. The traveling direction is bent toward the guide electrode, passes through the electron passage hole, and is further deflected to the side of the first control electrode in the ON state, and the deflected electrons are electron passage holes corresponding to the first control electrode in the ON state. Gathered in
Further, the electrons pass through the electron passage hole corresponding to the second control electrode to which the voltage is applied corresponding to the brightness information of the image, converge on the corresponding phosphor surface, collide, and efficiently emit the phosphor. You can

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. In each drawing, FIG. 1 is a sectional view showing an embodiment of the flat panel display device of the present invention, FIG. 2 is an enlarged sectional view showing a control electrode plate of the flat panel display device shown in FIG. 1, and FIG.
1 is an enlarged plan view showing a control electrode plate of the flat panel display device shown in FIG. 1, FIGS. 4 to 6 are views showing a flat panel display device according to another embodiment of the present invention, and FIG. FIG. 11 is a cross-sectional view showing a plane on a deflection electrode side of a flat panel display device according to still another embodiment of the present invention.

[Embodiment 1] A flat-panel display device 1 of the present embodiment.
As shown in FIG. 1, 0 is a sealed container 1 kept in a high vacuum.
The phosphor surface 12 provided on a part of one inner surface (upper plane in FIG. 1) 111 and the other surface (lower plane in FIG. 1) 112 facing the phosphor surface 12 are provided. Deflection electrode group 13, control electrode plate 14 having a plurality of electron passage holes 14A interposed between deflection electrode group 13 and phosphor surface 12, and from control electrode plate 14 to sealed container 1
1 and a side surface (left side surface in FIG. 1) 113 of the first electron source 15 that is arranged so as to be biased and emits thermoelectrons.

As shown in FIG. 1, the electron source 15 is arranged so as to be offset from the side surface 113 side of the hermetically sealed container 11 and emits thermoelectrons arranged parallel to the side surface 113. The linear hot cathode 151, the back electrode 152 and the beam extraction electrode 153 which are arranged in front of and behind the linear hot cathode 151 with a space, and the shield which is arranged in front of the beam extraction electrode 153 with a space. It comprises an electrode 154 and a focus electrode 155 which is interposed between the shield electrode 154 and the beam extraction electrode 153 and guides the thermoelectrons extracted from the beam extraction electrode 153 into a sheet shape to the shield electrode 154. The thermoelectrons emitted from the electron source 15 travel in parallel to a predetermined position along the deflection electrode group 13 and the control electrode plate 15 as a sheet-shaped thermoelectron group.

As shown in FIG. 1, the deflection electrode group 13 is formed with a large number of deflection electrodes 131, 132, ... In parallel with the left side surface 113 of the hermetically sealed container 11 in a stripe shape. ..

Further, the control electrode plate 14 is shown in FIGS.
, A surface insulating substrate 141 made of ceramics containing alumina as a main component, and a surface insulating substrate 141.
The first control electrode 142 and the second control electrode 143 are provided on both surfaces of the first control electrode 142 and the second control electrode 143, and a voltage is applied to the first control electrode 142 and the second control electrode 143.
It is designed to control thermoelectrons passing through. That is, the many electron passage holes 14A of the control electrode plate 14 are
As shown in FIGS. 2 and 3, the first control electrode group 142 is formed by being arranged in a matrix in the vertical and horizontal directions, and the first control electrode group 142 is provided on the surface of the surface insulating substrate 14 on the side facing the deflection electrode group 13. The second control electrode group 14 is provided corresponding to the group 13.
3 is provided on the surface of the surface insulating substrate 141 opposite to the phosphor surface 12, and the electron source 15 is controlled by individually controlling the voltage applied to each of the following electrodes forming each of the control electrode groups 142 and 143. The above-mentioned thermoelectrons emitted from the electron pass through the desired electron passage hole 14A.

That is, the first control electrode group 142 has a width W wider than the diameter of the electron passage hole 14A.
A, 142B, ... Are arranged in stripes along each electron passage hole 14A in the column direction (direction parallel to the left side surface 113), and the second control electrode group 143 is provided with the electron passage hole 14A. Second control electrodes 143A, 1 wider than the diameter of
43B, ... Are arranged side by side in a stripe shape along the electron passage hole 14A in the row direction (direction orthogonal to the left side surface 113), and further, each first control electrode 142A, 142.
B, ... And each second control electrode 143A, 143B ...
And are orthogonal to each other. Further, each of the first control electrodes 142A, 142B, ... And each of the second control electrodes 143A, 143B, ... Extends along the inner peripheral surface of each electron passage hole 14A, and extends in the inner peripheral surface. They are separated by leaving a gap 19 between their ends, and they are electrically insulated from each other.

Next, the operation will be described. First, thermoelectrons are emitted from the linear hot cathode 151 as an electron beam BB. In the electron beam B, thermoelectrons are generated by the focus electrode 15
Linear hot cathode 15 adjusted to a predetermined thickness by 5 or the like
It is emitted in a state of being distributed in a uniform sheet having a width substantially equal to the length of 1 and horizontally enters between the deflection electrode group 13 and the control electrode plate 14. At this time, the first control electrode group 142 acts as a scanning electrode to determine a line in the column direction in which the electron beam B travels. In the example shown in FIG. 1, a state will be described in which thermoelectrons are successively passed through only one row of electron passage holes 14X.

The first control electrode 14 near the electron source 15
2A, 142B, ... (See FIG. 3) and the deflection electrode 13
, 132 are applied with a voltage V _c approximately equal to the energy of thermoelectrons, and the electron beam B travels horizontally in a constant potential. At this time, the deflection electrodes 131, 132 up to a few points before the deflection electrode corresponding to the electron passage hole 14X,
Is applied with a voltage V _c , and a voltage V _b lower than the voltage V _c is applied to the deflecting electrodes 13X, which are several points ahead of them, in order to bend the electron beam toward the electron passage hole 14X.
(Usually about _{V b = -V c ~-2V} c) is applied as a deflection voltage, it proceeds bent electron beam B toward the electron passing hole 14X from the distortion of the electric field.

At this time, a voltage Von, which is about the same as the energy of the thermoelectrons, is applied to the row of electron passage holes 14X, and the thermoelectrons are in the ON state where they can pass through the electron passage holes 14X. Further, thermoelectrons pass through the electron passage holes 14X located at the portion where the second control electrode which is in the ON state among the one row of electron passage holes 14X intersects with the first control electrode. At this time, the electron beam B spreads over several to ten or more first control electrodes before and after the electron passing hole 14X, but several to 20 holes located in front of the row of electron passing holes 14X. Since the off-voltage (about -5 to 5 V) is applied to all the first control electrodes located behind the first control electrodes and the electron passage holes 14X thereof, the electron passage holes 14A in the other columns are Thermal electrons do not reach.

If the number of the first control electrodes in the OFF state in front of the row of electron passage holes 14X is large, the horizontal movement of the electron beam B is affected by these first control electrodes. The number of control electrodes is minimized. Further, the first control electrode in the ON state is the electron passage hole 14X.
Has the effect of converging thermoelectrons, and most of the thermoelectrons B1 in the range of several times the width of the first control electrode are incident on the row of electron passing holes 14X with a certain incident angle before the electron passing holes 14X. However, some of the thermoelectrons do not enter the row of electron passage holes 14X. The thermoelectrons that do not enter are directed to the deflection electrode group 13 by the first control electrode in the off state, but most of the thermoelectrons heading to the electron passage holes 14X in a row with an incident angle from before the row of electron passage holes 14X. Since it goes to the front of 14X, only a few of the control electrodes in front of these are turned off.

Further, a voltage V _c for converging unnecessary thermoelectrons B2 is applied to the deflection electrode group 13 preceding these, except for the several deflection electrode groups 13X to which the deflection voltage is applied. Therefore, the off voltage is applied to all the first control electrodes on the front side of the electron passage hole 14X so that the thermoelectrons do not return to the first control electrode 142 side again.

The thermoelectrons incident on the electron passing hole 14X in the ON state are converged by a strong lens near the exit of the electron passing hole 14X formed by the high voltage of the phosphor surface 12, and are almost perpendicular regardless of the incident angle. The fluorescent substance surface 12 collides against the fluorescent substance surface 12 to generate a predetermined fluorescence.

Therefore, according to this embodiment, the thermoelectrons emitted from the small number of electron sources 15 are effectively used, and the deflection electrode group 13, the first control electrode group 142 and the second control electrode group 143 are applied. The thermoelectrons corresponding to the position where the voltage is controlled to emit light are accurately selected, and the electron passage hole 14X at that position is selected.
The phosphor surface 12 to be the light emission target can be accurately applied by passing through, and a screen with excellent contrast can be obtained. That is, according to the present embodiment, the utilization efficiency of the electrons emitted from the electron source 15 is increased, the thermoelectrons can be controlled with high accuracy, and high resolution can be obtained.

[Embodiment 2] As shown in FIG. 4, the flat display device of the present embodiment has a small hole between the deflection electrode group 13 and the control electrode plate 14 in the flat display device of the above embodiment. A thermoelectron which is interposed as a guide electrode 16 through which thermoelectrons pass through a thin metal plate having a large number of meshes (not shown) and which is emitted from an electron source 15 between the guide electrode 16 and the deflection electrode group 13. Is configured in the same manner as the flat-panel display device of the above-described embodiment except that it is made to enter horizontally.

Next, the operation of the flat panel display device of this embodiment will be described. Here, a case where the thermoelectrons pass only through the electron passage holes 14X in the central row of the control electrode plate 14 will be described. First, in the electron beam B emitted from the linear hot cathode 151, thermoelectrons are emitted in the form of a sheet by the focus electrode 155 and the like, and horizontally enter between the deflection electrode group 13 and the guide electrode 16. To do. At this time, the deflecting electrodes 131, 132, ...
.. for all of the voltage V _c approximately equal to the energy of thermoelectrons
Is applied, and the electron beam B that has entered as described above travels straight in the horizontal direction from the electron source 15 side. Further, the deflecting electrodes 131, 132, ...
The deflection voltage V _b (usually V _b
= −V _c to −2 V _c ) is applied, the deflection electrode 13
Most of the electron beam B traveling straight to 1, 132, ... Is bent in the direction of the guide electrode 16 due to the distortion of the electric field in the vicinity of these deflection electrodes, and advances.
To reach between the guide electrode 16 and the first control electrode group 14 through the mesh-shaped small holes. There is a first control electrode that is in an ON state one by one in the traveling direction of the electron beam B, and at least all other first control electrodes in the vicinity thereof are in an OFF state, and this is in the ON state. The electron beam B that has entered the first control electrode being attracted is partially attracted to the first control electrode in the ON state. Of the thermoelectrons that have arrived, the thermoelectrons B ₁ that have reached the electron passage holes 14X located in the row of the second control electrodes that are turned on in the second control electrode group 143 are the electron passage holes 14X.
And the phosphor surface 12 is caused to emit light in the same manner as in the above embodiment. The first control electrode group 142 in the off state is applied with a low voltage of -5 to +5 V corresponding to the off state, and the electron beam B cannot reach these first control electrode group 142.

Therefore, according to the present embodiment, the same effect as that of the above embodiment can be expected, and the guide electrode 1
Since the guide electrodes 16 limit the thermoelectrons that reach the first control electrode in the ON state by applying a voltage to the control electrode 6, it is not necessary to finely control the voltage applied to the first control electrode group 142, and The drive circuit can be simplified. The guide electrode 16 in the present embodiment is not limited to the small holes in the above-mentioned embodiment, and may be a slit if it is formed in a state in which a predetermined voltage can be applied and most of electrons can pass. It may be a hole.

[Embodiment 3] As shown in FIG. 5, the flat display device of the present embodiment is equivalent to or slightly larger than the electron passage hole 14A of the control electrode plate 14 of the flat display device of the first embodiment. Electron passage hole (not shown)
Control electrode plate 1 using a thin metal plate having
The flat-panel display device of Example 2 has the same structure as that of the flat-panel display device of Example 2 except that the first control electrode 142 of FIG.

Next, the operation of the flat panel display device of this embodiment will be described. A voltage similar to that of the second embodiment is applied to each electrode, and if the electron beam B from the electron source 15 enters between the deflection electrode 13 and the guide electrode 16 in this state, the traveling direction of the electron beam B is guided. It is bent in the direction of the electrode 16 and reaches the guide electrode 16. Most of the reached thermoelectrons pass through the electron passage holes of the guide electrode 16 and are sequentially applied one by one in the first control electrode group 142 to reach the first control electrodes which are in the ON state. .. Of the thermoelectrons reaching the first control electrode, the second control electrode group 143 is turned on and passes only the electron passage hole 14X corresponding to the second control electrode, and the phosphor surface 12 corresponding to this electron passage hole 14X. Light up.

Therefore, according to this embodiment, the first control electrode in the ON state has no effect of collecting thermoelectrons, but the electron passage hole of the guide electrode 16 and the electron passage hole 14A of the control electrode plate 14 are used. Since and overlap, the phosphor surface 12
The rate of electrons passing to the side can be improved as compared with the above-mentioned respective examples, and further, the operational effects according to the above-mentioned respective examples can be expected.

[Embodiment 4] The flat-panel display device of the present embodiment is the same as the flat-panel display device of the second embodiment except that it has two electron sources as shown in FIG. It is configured. One of the first electron sources 15 has the same structure as the electron source 15 of the flat display device of each of the above-described embodiments, and the other second electron source 17 has the other side surface 11 facing the first electron source 15.
4, the electron source 17 is similar to the first electron source 15 in that the linear hot cathode 171, the back electrode 172, the beam extraction electrode 173, the shield electrode 174, and the focus electrode 1 are arranged.
It is configured with 75.

Next, the operation of the flat panel display device of this embodiment will be described. First, the sheet-shaped electron beams B emitted from the first electron source 15 and the second electron source 17, respectively.
Enters horizontally between the deflection electrode group 13 and the guide electrode 16 from the opposite direction to the inside. At this time, the guide electrode 1
6. Some of deflection electrodes corresponding to the electron passage hole 14X Corresponding to all the deflection electrodes 131, 132, ... 13Y and the electron passage hole 14X extending from the deflection electrode near the first electron source 15 to the first electron source 15. Some of the deflecting electrodes are applied to all the deflecting electrodes 13U, ... Which extend from the deflecting electrode near the second electron source 17 to the second electron source 17, because a voltage V _c approximately equal to the energy of thermoelectrons is applied. , Each electron beam goes straight to the front of the electron passage hole 14X. Further, since the deflection voltage _Vb is applied to the deflection electrodes between the deflection electrodes 13Y and 13U, each electron beam B changes its direction toward the guide electrode 16 due to the distortion of the electric field in this region. It advances and reaches the guide electrode 16, and most of it is a mesh-shaped small hole (not shown) of the guide electrode 16.
And passes between the guide electrode 16 and the first control electrode group 14 respectively. There is a first control electrode that is in the ON state in the traveling direction of these electron beams B, and all of the other first control electrodes are in the OFF state. At least part of the electron beam B
Arrives. Other operations are the same as those in the second embodiment.

Therefore, according to the present embodiment, since the electron sources are provided at two places, if the electron beam B emitted from the electron source at one place is doubled, the electron beam B slightly increases as the electron beam B moves horizontally. It is possible to mitigate the adverse effect that the thickness changes and the brightness becomes non-uniform.

[Fifth Embodiment] As shown in FIG. 7, the flat-panel display device according to the present embodiment has a first electron source 1 according to a fourth embodiment.
5 is divided into a plurality of linear hot cathode portions, and the linear hot cathode 171 constituting the second electron source 17 is divided into a plurality of linear hot cathode portions. The configuration is the same as that of the fourth embodiment except that it is provided. That is, the linear hot cathode 151 includes five linear hot cathode portions 151A and 151A.
B, 151C, 151D, 151E, and each of the linear hot cathode portions 151A, 151B, 151C, 151D, 1
51E has fixing jigs 151F and 151F at both ends.
It is fixed by applying a certain amount of tension. Further, the linear hot cathode 171 includes four linear hot cathode portions 171A, 171B, 1
71C and 171D, and each linear hot cathode part 171 is divided.
Both ends of A, 171B, 171C and 171D are fixed to the fixing jigs 171F and 171F by applying a certain tension.

Further, the linear hot cathode 151 of the first electron source 15 is used.
When the linear hot cathode 171 of the second electron source is vertically projected with respect to, the one outer side (the upper end side in FIG. 7) of fixing the linear hot cathode portion 171A of the linear hot cathode 171 of the second electron source 17 is fixed. )
The two fixing jigs 171F on the outer side (the lower end side in FIG. 7) for fixing the fixing jig 171F and the linear hot cathode portion 171D are the linear heat of the linear hot cathode 151 of the first electron source 15. Fixing jig 151F on the upper end side for fixing the cathode portion 151A and fixing jig 15 on the lower end side for fixing the linear hot cathode portion 151E.
It is provided at a position where two of 1F overlap and coincide with each other. However, when the same projection is performed, the fixing jigs other than the above-mentioned fixing jigs are not in positions where they overlap each other, and the fixing jigs 171F of the linear hot cathode 171 are not the linear heating cathodes 151. It is provided so as to be located at a substantially intermediate point between the pair of fixing jigs 151F, 151F for fixing the cathode portion.

Therefore, according to the present embodiment, the first electron source 1
5 linear cathode parts 151A, 151B, 151C, 15
The electron beams B emitted from 1D and 151E have a small amount of thermoelectrons emitted from the vicinity of the fixing jig 151F, and the electron flow density in that portion becomes small as a whole,
The non-uniform portion with reduced density is complemented and relaxed by the electron beam B emitted from each linear cathode part 171A, 171B, 171C, 171D of the second electron source 17,
Further, the nonuniformity of the electron beam B emitted from the second electron source 17 is similarly mitigated by the electron beam B from the first electron source 15. Other than this, the same effects as those of the fourth embodiment can be expected.

In each of the above embodiments, only the one using the linear hot cathode as the electron source has been described. However, if the electron source is capable of emitting the electron beam B in the form of a sheet, the present invention is applicable to each of the above embodiments. It is not limited to.

Further, in each of the above-described embodiments, only the electrodes of the first control electrode group are sequentially turned on for scanning, and the electrodes of the deflection electrode group are scanned in accordance with the scanning. However, even in the case of interlaced display in which every other control electrode is turned on, the same operational effect as in each of the above embodiments can be expected.

[0045]

As described above, according to the present invention, highly efficient light emission can be achieved by utilizing electrons as effectively as possible for light emission on the phosphor surface and accurately applying electrons to the phosphor surface. It is possible to provide a flat-panel display device that can obtain high resolution.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a flat-panel display device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a control electrode plate of the flat panel display device shown in FIG.

3 is an enlarged plan view showing a control electrode plate of the flat panel display device shown in FIG. 1. FIG.

FIG. 4 is a view corresponding to FIG. 1 showing a flat-panel display device according to another embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1 showing a flat-panel display according to still another embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1 showing a flat-panel display device according to still another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a plane on a deflection electrode side of a flat-panel display according to still another embodiment of the present invention.

FIG. 8 is an exploded perspective view showing a main part of a conventional flat-panel display device.

9A is an exploded perspective view showing an enlarged control electrode portion of the flat panel display device shown in FIG. 8, and FIG. 9B is an enlarged plan view showing the control electrode portion shown in FIG. ..

10 is a view corresponding to FIG. 1 showing another conventional flat-panel display device.

[Explanation of symbols]

 11 Sealed Container 12 Phosphor Surface 13 Deflection Electrode 14A Electron Passage Hole 15 Electron Source 111 Electron Source 111 One Inner Surface of Sealed Container 112 Other Inner Surface of Sealed Container 141 Surface Insulating Substrate 142 First Control Electrode Group 143 Second Control Electrode Group

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Keiji Fukuyama 2-14-40 Ofuna, Kamakura-shi, Kanagawa Mitsubishi Electric Corporation Life Systems Research Institute (72) Masato Saito 2--14-40 Ofuna, Kamakura, Kanagawa No. Mitsubishi Electric Corporation Life Systems Research Institute (72) Inventor Ryoji Watanabe 2-14-40 Ofuna, Kamakura City, Kanagawa Prefecture Mitsubishi Electric Corporation Life Systems Research Institute (72) Inventor Yoshinori Hatanaka 1 Hirosawa, Hamamatsu City, Shizuoka Prefecture Chome 22-6

Claims (1)

Claim: What is claimed is: 1. A phosphor surface provided on a part of an inner surface of a hermetically sealed container kept in a high vacuum, a plurality of deflection electrodes arranged in parallel at a position facing the phosphor surface, and a deflection electrode. And a phosphor surface are interposed between the surface insulating substrate and a plurality of electron passage holes, and a plurality of surface insulating substrates are arranged in parallel on the surface of the surface insulating substrate on the side of the deflection electrode to control the electrons passing through the electron passage holes. A pair of first control electrodes, to which a voltage is applied, and a pair of first control electrodes are arranged in parallel on the phosphor-side surface of the surface insulating substrate, and electrons passing through the electron passage holes The second control electrode to which a voltage is applied so as to control the first control electrode and the surface insulating substrate having both of these control electrodes and the deflection electrode are interposed, and a voltage is applied to allow electrons to pass therethrough. A guide electrode having a plurality of electron passage holes for guiding to the control electrode side, and a guide The space between the pole and the deflection electrode is provided with a pair of electron sources provided in close proximity to both side surfaces of the hermetically sealed container and parallel to the first control electrodes. Is a voltage that sequentially turns on one by one in response to the application of the deflection voltage to the deflection electrodes to deflect the electron beams emitted from the pair of electron sources to the first control electrode side in the on state, A flat panel display device characterized in that a voltage corresponding to brightness information of an image is applied to the second control electrode group to allow electrons to pass through the electron passage holes.