JPH02306528A - Flat plate type image display device - Google Patents

Abstract

PURPOSE:To have uniform correction of the electron beam position in the longitudinal direction of a wire cathode even in case an electron gun, electrode, etc., are poorly located, by impressing the correction voltage on a vertical scanning deflection electrode, a shield electrode, or a position correcting electrode which is formed flush with the vertical scanning deflection electrode while the correction voltage is divided in the horizontal direction of the screen. CONSTITUTION:Electrons are generated by heating a wire cathode electrode 17, and the beam 21 of these electrons is advanced through electrode holes 18a, 19a under the action of the electric field generated by a back electrode 16, No.1 grid electrode 18, and No.2 grid electrode 19. After being converged by a convergence electrode 20 in the vertical direction of the screen, the electron beam is advanced between a vertical scanning electrode 11 and a shield electrode 13. At this time, a voltage obtained from the voltage, approx. the same as the voltage impressed on the shield electrode 13, which was superposed with the voltage varying during one period of vertical scanning cycles is impressed on a position correcting electrode 22. This enables correction of the beam position with the voltage impressed on the position correcting electrode 22 even though dislocation has occurred in the relative locational relationship between an electron gun, the electrode 11, and the one 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat image display device used in color television receivers, computer terminal displays, and the like.

2. Description of the Related Art Recently, thin flat image display devices have been widely used in the field of displaying images, characters, and the like.

The present applicant previously proposed a flat-plate image display device shown in FIGS. 5 and 6 in Japanese Patent Application No. 63-27099. This flat panel image display device will be explained with reference to FIGS. 5 and 6.

As shown in FIG. 5, a light emitting section 10 made of a phosphor is provided on the inner surface of a transparent substrate 9 that constitutes a part of the vacuum envelope 8. A vertical scanning deflection electrode 11 is provided on the inner surface of the insulating substrate 12, facing the light emitting section 10o.
is provided. The vertical scanning deflection electrodes 11 are divided in the vertical direction at a predetermined pitch and arranged in parallel in the horizontal direction. Between the vertical scanning deflection electrode 11 and the light emitting section 1o, a shield electrode 13, a modulation electrode 14, and a horizontal deflection electrode 15 are provided at predetermined intervals from the vertical scanning deflection electrode 11 side. The shield electrode 13 is planar and has electron beam passing holes 13'a arranged at a predetermined pitch in the horizontal direction and arranged in parallel in the vertical direction. The modulation electrode 14 is electrically divided horizontally at a predetermined pitch and arranged in parallel in the vertical direction, and an electron beam passage hole 14a is formed in each divided piece. The horizontal deflection electrode 15 is formed in the shape of two combs in which the vertical part is divided horizontally at a predetermined pitch, and the bases of the vertical parts are connected by a common bus bar. An electron gun is provided between the vertical scanning deflection electrodes 11 and the shield electrode 13 to generate an elongated belt-shaped electron beam in the parallel direction of the vertical scanning deflection electrodes 11, that is, in the horizontal direction. This electron gun consists of a back electrode 16, a linear cathode 17 that generates electrons, a first grid electrode (Gl electrode) 18 having an electron beam passage hole 18a, and an electron beam arranged from the side remote from the vertical scanning deflection electrode 11 and the shield electrode 13. Passing hole 1
9a and a pair of focusing electrodes 20.

Next, the operation of the above conventional flat panel image display device = 5- Explain the principle.

Electrons are generated by heating the linear cathode 17, and the electrons are extracted to the focusing electrode 20 side as an electron beam 21 by a predetermined potential applied to the back electrode 16, the G1 electrode 18, and the G2 electrode 19. The electron beam 21 is focused. At the same time, the position of the electron beam 21 is corrected by applying a position correction voltage for the electron beam 21 to each of L-N focusing electrodes 20 provided on both sides of the electron beam 21. The electron beam 21 travels through a space where the vertical scanning deflection electrode 11 and the shield electrode 13 face each other. Here, when substantially the same potential is applied to the vertical scanning deflection electrode 11 and the shield electrode 13, the beam moves straight between the two electrodes 11.13, but the vertical scanning deflection electrodes 11a to 11. Since voltages with different signals are applied, the electron beam 21 is deflected by the light emitting section 10@. In Figure 7,
The vertical scanning deflection electrode 11B includes a vertical scanning deflection electrode 11,
= 6 = A potential (EBO) for deflecting the electron beam 21 that has passed straight between the shield electrodes 13 toward the light emitting section 10 is constantly applied, and one field (1V) is applied to the vertical scanning deflection electrode 11b.
) is applied to the shield electrode 13 for only one horizontal scanning period (IH) from the start of the
) pulse is applied, and a 2H pulse is applied to the vertical scanning deflection electrode 11c.
A pulse voltage that becomes longer for each horizontal scanning period is sequentially applied to the 3H period and lid, and a voltage of the Ellll value is constantly applied as a direct current to the vertical scanning deflection electrode 11n closest to the focusing electrode 20.

Through the above operations, the electron beam 21 is sequentially deflected toward the light emitting section 10 from the top of the screen, and scanning is performed in the vertical direction. The uniform electron beam 21 that has progressed toward the light emitting section 10 passes through the electron beam passing hole 13a of the shield electrode 13, and is horizontally divided into a plurality of electron beams 21a, 21b12.
1C1..., and then these electron beams 21
a, 21b, 21C, . . . are modulated by the modulation electrode 14, respectively. Next, each electron beam 21a, 21b is modulated.

21c1... are deflected by the horizontal deflection electrode 15 all at once in the horizontal direction with a predetermined width, causing a predetermined position of the light emitting section 10 to emit light. Therefore, one image can be displayed.

Problems to be Solved by the Invention However, in the configuration of the conventional example as described above, as the screen to be displayed becomes larger, the electron beam 21 generated in the electron gun section is divided between the vertical scanning deflection electrode 11 and the shield electrode 1.
3, the vertical scanning deflection electrode 11
Due to the positional accuracy of the shield electrode 13 and the electron gun section, it becomes difficult to maintain uniform beam landing accuracy and beam spot shape over the entire area from the top to the bottom of the screen, resulting in a decrease in image quality. In order to solve this problem, conventionally, the focusing electrode 20 provided in the electron gun section is electrically divided across the electron beam 21 as described above, and a voltage for correcting the position of the electron beam is applied to each part. It was superimposed. However, since it is necessary to divide the focusing electrode 20Z, the configuration is complicated, and furthermore,
Since the correction is applied uniformly in the longitudinal direction of the linear cathode 17, it is difficult to make the correction uniform in the longitudinal direction of the linear cathode 17.

The present invention solves the above-mentioned problems of the prior art, and makes it possible to easily improve the positional accuracy of beam landing over the entire screen, as well as to make the beam spot diameter uniform, thereby improving image quality. It is an object of the present invention to provide a flat panel image display device that can improve the performance of the image display device.

Means for Solving the Problems The technical means of the present invention for solving the above problems consists of a light-emitting section made of at least a phosphor, and a vertical light-emitting section divided at a predetermined pitch at a position facing the light-emitting section. A scanning deflection electrode, an electron gun provided to generate an electron beam in the parallel direction of the vertical scanning deflection electrode, and an electron gun installed adjacent to the vertical scanning deflection electrode on the same plane. It is equipped with a position correction electrode for correcting the position of the emitted electron beam.

The position correction electrode can be divided into a plurality of parts in the horizontal direction of the screen, and the position correction electrode is provided with a position correction voltage that changes every vertical scanning period (1V) for correcting the position of the electron beam. Alternatively, a DC voltage can be applied.

Further, at least a light emitting section made of a phosphor, a vertical scanning deflection electrode provided at a position facing the light emitting section and divided at a predetermined pitch, and a vertical scanning deflection electrode provided between the vertical scanning deflection electrode and the light emitting section. and an electron gun provided to generate an electron beam in a direction parallel to the vertical scanning deflection electrode, and a correction voltage for correcting the position of the electron beam is applied to the shield electrode. It is constructed.

The shield electrode can be divided into a plurality of parts in the horizontal direction of the screen.

Further, at least a light emitting part made of a phosphor, a vertical scanning deflection electrode divided at a predetermined pitch at a position facing the light emitting part, and a parallel direction of the vertical scanning deflection electrode are provided to generate an electron beam. The device is equipped with an electron gun, and is configured such that a correction voltage for correcting the position of the electron beam is applied to some or all of the vertical scanning deflection electrodes.

The correction voltage for correcting the position of the electron beam can be a voltage that changes every vertical scanning period (1V) or a DC voltage.

Further, at least a light emitting section made of a phosphor, a vertical scanning deflection electrode provided at a position facing the light emitting section and divided at a predetermined pitch, and a vertical scanning deflection electrode provided between the vertical scanning deflection electrode and the light emitting section. an electron gun provided to generate an electron beam in a direction parallel to the vertical scanning deflection electrode, and a voltage of either the vertical scanning deflection electrode or the shield electrode is changed. It is constructed.

action The effects of the above technical means are as follows.

By applying a correction voltage divided in the horizontal direction of the screen to the vertical scanning deflection electrode, shield electrode, or position correction electrode formed on the same surface as the vertical scanning deflection electrode, the positional accuracy of the electron gun, vertical scanning deflection electrode, etc. can be improved. At worst, the position of the electron beam can be corrected uniformly in the length direction of the linear cathode.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

First, a first embodiment of the present invention will be described.

FIG. 1 is a partially cutaway side view showing a flat panel image display device according to a first embodiment of the present invention.

As shown in FIG. 1, a light emitting section 10 made of fluorescent material is provided on the inner surface of a transparent substrate 9 made of glass and forming a part of the vacuum envelope 8. As shown in FIG.

The light emitting part 10 may be provided with a metal back layer for the purpose of improving the luminance of the light emitted, and if color display is to be performed,
Three-color phosphors that emit red, green, and blue light are formed in stripes at a predetermined pitch. A vertical scanning deflection electrode 11 is provided on the inner surface of an insulating substrate 12 forming a part of the vacuum envelope 8 so as to face the light emitting section 10 and to be substantially parallel thereto. The vertical scanning deflection electrodes 11 are electrically divided into thin strips at a predetermined pitch in the vertical direction, and n pieces are arranged in parallel in a number corresponding to the horizontal scanning line or 1/n thereof (an integer of n≦2). has been done.

The vertical scanning deflection electrode 11 is formed by forming a transparent conductive film, a thin film such as an A1 film, or an Ag paste on the surface of an insulating substrate 12 by photoetching, screen printing, or the like. On the inner surface of the insulating substrate 12, a position correction electrode 22 having the same shape as the vertical scanning deflection electrode 11 is provided in a direction perpendicular to the vertical scanning deflection electrode 11n in order to correct the position of the electron beam on the electron gun side, which will be described later. are provided at a predetermined interval. The number of the second position correction electrodes 22 may be one or more. Further, it is not necessary to have the same convergence as each vertical scanning deflection electrode 11. Between the vertical scanning deflection electrode 11 and the light emitting section 10, from the vertical scanning deflection electrode 11 side, a planar shield electrode 13 having an electron beam passage hole 13a and a predetermined pitch in the horizontal direction of the screen are arranged, as in the above conventional example. A modulation electrode 14 having an electron beam passing hole 14a and two comb-shaped horizontal deflection electrodes 15 for deflecting the electron beam in the horizontal direction of the screen are electrically divided and arranged in parallel in the vertical direction, with a predetermined interval between them. It is maintained and placed. Although not shown, an insulating spacer is inserted between each of these electrodes to maintain and fix each electrode at a predetermined distance. The parallel direction of the vertical scanning deflection electrode 11 between the vertical scanning deflection electrode 11 and the shield electrode 13;
That is, an electron gun is provided to generate a horizontally elongated belt-shaped electron beam. This electron gun includes a back electrode 16 from the side separated from the vertical scanning deflection electrode 11 and the shield electrode 13, a linear cathode 17 for generating electrons, a linear cathode 17 for generating electrons, and an electron beam passing hole 18a.
a first grid electrode (Gl electrode) 18 for controlling the amount of electron beam, a second grid electrode (G2 electrode) 19 having an electron beam passage hole 19a for extracting the electron beam from the linear cathode 17; It consists of a pair of focusing electrodes 20 for focusing the electron beam. In the illustrated example, the focusing electrode 20 is divided so as to sandwich the electron beam, but the focusing electrode 20 need not be divided and may be integrated. Although not shown, an insulating spacer is inserted between each electrode to keep each electrode at a predetermined distance and to fix the electrodes.

The operation of the above configuration will be described below.

Electrons are generated by heating the linear cathode 17, and these electrons are converted into G as an electron beam 21 by the electric field applied to the back electrode 16, the G1 electrode 18, and the G2 electrode 19.
Electron beam passing hole 18 of 1 electrode 18 and G2 electrode 19
a and 19b, and after being focused in the vertical direction of the screen by the focusing electrode 20, it moves between the vertical scanning electrode 11 and the shield electrode 13. At this time, the position correction electrode 22
As shown in FIG. 2, approximately the same voltage (DC) as the voltage applied to the shield electrode 13 and one vertical scanning period (
1V) and a voltage varying from Ea to Eb is superimposed.

In other words, the electron beam 21 passes between the vertical scanning deflection electrode 11° and the shield electrode 13 from the vertical scanning deflection electrode 11a to
The position correction electrode 22 is arranged so as to pass approximately through the center across In.
A position correction voltage is applied to. Here, position correction electrode 2
The position correction voltage applied to the electron beam 2 may be changed in accordance with the amount of position correction of the electron beam 21, and does not need to be in the sawtooth shape shown in FIG. 2, and may just be a change in the DC voltage. Next, the electron beam 21 whose position has been corrected by the position correction electrode 22 is scanned from the top to the bottom of the screen in the same manner as explained in the conventional example shown in FIGS. 21 is deflected toward the light emitting section 10 side. The electron beams 21 that have passed through the electron beam passage hole 13a of the shield electrode 13 are individually modulated by the modulation electrode 14, and further, the individual electron beams 21 are deflected simultaneously in the horizontal direction by the horizontal deflection electrode 15, and the light emitting portion 10 predetermined positions are made to emit light. Therefore, images 1, characters, etc. can be displayed.

In this way, even if a deviation occurs in the relative positional relationship between the electron gun section and the vertical scanning deflection electrode 11 and the shield electrode 13, the position of the electron beam 21 can be corrected by the correction voltage applied to the position correction electrode 22. Therefore, it is possible to improve the landing accuracy of the electron beam 21 and to make the electron beam spot diameter uniform over the entire screen from the top to the bottom of the screen.

Next, a second embodiment of the present invention will be described.

FIG. 3 shows a flat panel image display device according to a second embodiment of the present invention, and is a perspective view of a vertical scanning deflection electrode and a position correction electrode.

As shown in FIG. 3, vertical scanning deflection electrodes 11a and lln are provided on the inner surface of the insulating substrate 12, which are electrically divided into long thin strips at a predetermined pitch in the vertical direction and arranged in parallel in the horizontal direction. In the vertical scanning deflection electrode 11n
A position correction electrode 22 for correcting the position of the electron beam is provided adjacent to the electron beam. The position correction electrodes 22 are arranged at 22A, 22B, 22 in the length direction of the vertical scanning deflection electrode 11n, that is, in the length direction of the linear cathode 17 (see FIG. 1).
The position correction electrode 22B in the center is protruded toward the electron gun side from the position correction electrodes 22A and 22C on both sides, and the vertical scanning deflection is performed on this protrusion side. It is formed to have approximately the same length as the electrode 11n. The position correction voltages 22a, 2 are applied to each position correction electrode 22A, 22B, 22C from both ends of the insulating substrate 12.
2b and 22C are supplied. The other configurations are the same as those of the first embodiment.

According to this embodiment, the position correction electrodes 22A and 22B are divided into a plurality of parts in the length direction of the linear cathode 17 (see FIG. 1).
, 22C, it is possible to correct the uneven landing position of the electron beam 21 and the change in the electron beam spot diameter that occur in the length direction of the linear cathode 17 at each individual portion. .

Next, a third embodiment of the present invention will be described.

FIG. 4 is a partially cutaway perspective view showing a flat panel image display device according to a third embodiment of the present invention.

As shown in FIG. 4, the light emitting section 10 and the vertical scanning deflection electrode 1
The shield electrode 13 disposed in the space with 1 is divided into a plurality of parts (two in the illustrated example) in the horizontal direction of the screen, that is, in the length direction of the linear cathode 17 (see FIG. 1), and each is divided into two parts as shown in FIG. It is constructed so that the position correction voltage shown is applied, and the other construction is the same as the conventional example shown in FIG. 5 and described above.

According to this embodiment, by applying a position correction voltage to the shield electrode 13 divided into a plurality of parts in the length direction of the linear cathode 17, the landing position unevenness of the electron beam 21 that occurs in the length direction of the linear cathode 17 is reduced. It is also possible to correct changes in the electron beam spot diameter in individual parts.

Note that the shield electrode 13 may not be divided into a plurality of parts in the horizontal direction as described above, but the position correction voltage may be applied to one shield electrode 13. It does not have to be the sawtooth shape shown in Figure 2;
Other forms of position correction voltage or DC voltage, i.e.
The voltage may be different from the voltage applied to the vertical scanning deflection electrode 11 (EBP in FIG. 7).

As yet another embodiment of the present invention, the vertical scanning deflection electrode 11
A part or all of a to lln is applied with the sawtooth position correction voltage shown in FIG. The position of the electron beam may be corrected by superimposing it on the signal waveform shown in FIG.

Effects of the Invention As described above, according to the present invention, vertical scanning deflection electrodes,
Alternatively, the correction voltage can be divided and applied in the horizontal direction of the screen to the shield electrode or the position correction electrode formed on the same surface as the vertical scanning deflection electrode. The position of the beam can be corrected uniformly in the length direction of the linear cathode. Therefore, it is possible to improve the landing position accuracy of the electron beam generated from the electron gun, and to make the diameter of the electron beam spot uniform in the vertical direction. The image quality can be improved by making the intervals uniform.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing a flat plate shadow image display device according to the first embodiment of the present invention, FIG. 2 is a diagram showing an example of the signal voltage applied to the position correction electrode in the above embodiment, and FIG. The figure shows a second embodiment of the present invention, and is a perspective view of a vertical scanning deflection electrode and a position correction electrode. FIG. 6 shows a conventional flat panel image display device, and FIG. 5 is a partially cutaway perspective view.
FIG. 6 is a cross-sectional view, and FIG. 7 is a diagram showing signal voltages applied to the vertical scanning deflection electrodes in the conventional example. 10... Light emitting part, 11... Vertical scanning deflection electrode, 13
...Shield electrode, 14...Modulation electrode, 15...
Horizontal deflection electrode, 16... Back electrode, 17... Linear cathode, 18... G1 electrode, 19... G2 electrode, 2
0... Focusing electrode, 22... Position correction electrode.

Claims (8)

[Claims] (1) A light emitting section made of at least a phosphor, a vertical scanning deflection electrode divided at a predetermined pitch at a position facing the light emitting section, and generating an electron beam in a parallel direction of the vertical scanning deflection electrode. and a position correction electrode for correcting the position of the electron beam, which is provided on the same plane and adjacent to the vertical scanning deflection electrode on the electron gun side. Shape image display device. (2) The flat image display device according to claim 1, wherein the position correction electrode is divided into a plurality of parts in the horizontal direction of the screen. (3) A flat plate image display device according to claim 1 or 2, wherein a position correction voltage or a DC voltage that changes every vertical scanning period (1V) is applied to the position correction electrode for correcting the position of the electron beam. . (4) A light emitting section made of at least a phosphor, a vertical scanning deflection electrode provided at a position facing the light emitting section and divided at a predetermined pitch, and a vertical scanning deflection electrode provided between the vertical scanning deflection electrode and the light emitting section. an electron gun provided to generate an electron beam in the parallel direction of the vertical scanning deflection electrode, and a correction voltage for correcting the position of the electron beam is applied to the shield electrode. 1. A flat image display device comprising: (5) The flat image display device according to claim 4, wherein the shield electrode is divided into a plurality of pieces in the horizontal direction of the screen. (6) A light emitting part made of at least a phosphor, a vertical scanning deflection electrode divided at a predetermined pitch at a position facing the light emitting part, and generating an electron beam in a parallel direction of the vertical scanning deflection electrode. A planar image comprising an electron gun provided as above, and configured such that a correction voltage for correcting the position of the electron beam is applied to some or all of the vertical scanning deflection electrodes. Display device. (7) The correction voltage for correcting the position of the electron beam is 1
7. The flat image display device according to claim 4, wherein the voltage is a voltage that changes every vertical scanning period (1V) or a DC voltage. (8) A light emitting section made of at least a phosphor, a vertical scanning deflection electrode provided at a position facing the light emitting section and divided at a predetermined pitch, and a vertical scanning deflection electrode provided between the vertical scanning deflection electrode and the light emitting section. an electron gun provided to generate an electron beam in a parallel direction of the vertical scanning deflection electrode and the vertical scanning deflection electrode, and changing the voltage of either the vertical scanning deflection electrode or the shield electrode. 1. A flat-plate image display device comprising: