JPS60105144A - Picture display device - Google Patents

Abstract

PURPOSE:To remove line mismatching of a picture by a method, in which the inside of a vacuum glass container is formed into the convex shape in the horizontal direction having the central part at the top, while a phosphor is applied thereto and electron beams being emitted from plural linear thermal negative poles are controlled and accelerated for being collided. CONSTITUTION:Electron beams taken out from plural linear thermal negative poles are deflected by horizontal deflection electrodes 7 through plural electron beam control electrodes while being accelerated by acceleration electrodes 8 for being projected on a screen provided on an inner face of a glass container 9. The inner shape of the container 9, namely the surface shape of the screen is nearly convexed in the horizontal direction having the center at the top, while a curve giving the sectional shape in the horizontal direction is equal to the bent curve due to coulomb force of the electrodes 8 so as to be designed that the electrodes 8 and the screen may be parallel when driving the device. In this way, every line dismatching on the screen can be removed thus enabling to display a unified and highly qualitative image on the whole picture.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device in which an electron beam emitted from a hot cathode is controlled by an electron beam control electrode, and the electron beam is accelerated and impinges on a phosphor surface to display a σ-skew image. It is something.

Conventional configurations and their problems Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a much longer depth than the screen, making it difficult to create thin televisions. It was impossible to produce a receiver. Although EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color displays. , it has not yet been put into practical use.

Therefore, with the aim of displaying color television images on a flat display device using electron beams, the second screen was vertically divided into multiple sections and an electron beam was applied to each section. The light is deflected in the vertical direction to display a plurality of lights, and the light is divided horizontally into a plurality of sections, and each section is made to sequentially emit fluorescent materials such as R-G@B. There is a system that displays a television image as a whole by controlling the amount of electron beam irradiation on a single beam of light using a color image No. 18.

As shown in FIG. 1, this conventional image display element has, in order from the rear to the front, a back electrode 1, a line cathode 2 as an electron beam source, and vertical focusing electrodes 3h, 3.
b, a vertical deflection electrode 4, an electron beam flow control electrode 6, a horizontal focusing electrode 6, a horizontal deflection electrode 7, an electron beam acceleration electrode 8 and a glass tea utensil 9.22 are arranged;
The components are placed in the glass container and evacuated. A line cathode 2 serving as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. In the figure, only four wires 2-2 are shown). In this 9' embodiment, it is assumed that 16 tubes are provided, and they are numbered 2-2. These wire cathodes 2 are constructed by, for example, coating the surface of a tungsten wire with a diameter of 10 to 2Q/Zm with an oxide anode (1'A'$4).As will be described later, the upper wire cathode The polishing is performed so that electron beams are emitted for a certain period of time in order from 2A onwards.

The back electrode 1 creates a potential gradient with the vertical M' east main electrode (described later), and prevents electron beams from other line cathodes 2 other than the line cathode 2 which is controlled to emit electron beams for a certain period of time as described above. It works to suppress the generation of electron beams and push out the generated electron beams only in the forward direction. This back electrode 1 may be formed by a coating of conductive material applied to the inner surface of the rear wall of the glass bulb. In addition, these back electrodes 1
Instead of the linear cathode 2, a planar electron beam emitting cathode may be used.

The vertical focusing electrode 3a includes a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2a to 2y.
The electron beam emitted from the line cathode 2 is taken out through the slit 10 and focused in the vertical direction. The slit 1o may be provided with crosspieces at appropriate intervals in the middle, or it may be a row of through holes provided in many details at unreasonable intervals in the horizontal direction (the interval between the culms IW that are almost in contact with each other). Alternatively, it may be configured as a slit.

The vertical focusing electrode 3b is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the sulin 10, and conductors 132L, 13 are provided on the upper and lower surfaces of the insulating substrate 12, respectively.
b is provided, and the number is +114. and,
Conductors 13a facing each other.

13b, a vertical deflection voltage is applied to deflect the electron beam in the vertical direction. In the configuration example, a pair of conductors 1
3a and 13b, each electron beam from one line cathode 2 is deflected to a position corresponding to 16 lines in the vertical direction. The 16 vertical deflection electrodes 4 form 16 conductor pairs corresponding to the 16 line cathodes 2, 5'Zf.
As a result, the electron beam is deflected so as to draw 240 horizontal lines on the screen 21.

Next, the control electrode 6 is constituted by a conductive electrode 15 having a vertically long slit 14, and a plurality of conductive electrodes 15 are arranged horizontally at a predetermined interval. In this configuration example, 320 control electrode conductive plates 162L to 16
n (only 10 are shown in the figure).

d) Control electrode 6C1, each of which divides the electron beam horizontally into one pixel and extracts it, and its) 11
1 excess amount is controlled according to the video signal for displaying each picture element. Therefore, the control electrode 5 is
If 0 lines are provided, 320 pixels can be displayed per horizontal line. In order to display images in color, each picture element is displayed using phosphors of three colors, R, G, and B, and each control electrode 6 receives each of the P, G, and B image signals. Added sequentially. Furthermore, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 6, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 is a plurality of vertically long electrodes (320 electrodes in this embodiment) facing the slot nozzle 14 of the control electrode 6.
The electron beam for each picture element divided in the horizontal direction is focused in the horizontal direction to form a narrow electron beam.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slots 16, and a horizontal deflection voltage is applied between each conductive plate 18 to Each elemental electron beam is deflected in the horizontal direction, and a screen 21-H sequentially irradiates each of the R, G, and B phosphors to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam.

The accelerating electrode 8 is made up of a plurality of conductive wires 19 which are provided in the same position as the vertical deflection electrode 4 in a horizontal direction.
Accelerate as if colliding with 1.

The screen 21 is constructed by applying a phosphor 2o that emits light when irradiated by an electronic beacon to the back surface of a glass plate 9, and adding a metal layer (not shown). For one slot 14 of the fluorescent body 2o11 control'C1, for each one electron beam VC2 divided in the horizontal direction, three colors of fluorescent light, L and B are applied. There are two pairs of bodies, each coated in stripes in the vertical direction. In FIG. 1, the dashed lines drawn on the screen 21 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines indicate each of the plurality of control electrodes 5. Indicates the corresponding horizontal division. As shown in the enlarged view in Figure 2, one section V divided by these two has R, 'G, and B phosphors 20 for one pixel in the horizontal direction, and 16 lines in the vertical direction. It has a width of The size of one compartment, for example, 1 gate horizontally and 16 gates vertically.
It is a gate. Note that in FIG. 1, the scale in the horizontal direction is greatly expanded relative to the vertical direction. Further, in this embodiment, only one pair of R, G, and Is phosphors 20 for one picture element is provided for one control electrode 5, that is, one electron beam, but for two or more picture elements, In that case, R, G, and H video signals corresponding to two or more picture elements are sequentially applied to the control electrode 5, and horizontal deflection is performed in synchronization with this.

The above is an outline of the principle of the painter's display device, and the problems of this conventional example will be explained with reference to FIGS. 3a to 3d4.

FIG. 3a is a top view of the area between the water 17-deflection electrode end and the glass container 90 in FIG.
3C does not show the DD' sectional view in FIG. 3a. FIG. 3d shows the image on the screen 21 viewed from outside the crow container 9.

As mentioned above, the accelerating electrode 8 is made up of a plurality of conductive wires 19 stretched horizontally, and when the apparatus is stopped, it maintains its straight shape due to the horizontal tension as shown by the dotted line in FIG. 3a. However, when the device is driven, the VC is, for example, 500 to 600 v for the horizontal deflection originals 1 and 7, and about 10 v for each of the accelerating electrode 8 and the metal back (not shown) of the screen 21.
Since a voltage of kv is applied, a Coulomb force acts between the electrodes, but the accelerating electrode 8, which has low rigidity, is deflected in the direction of the horizontal deflection electrode 7 due to this Coulomb force.
It has a moon shape as shown by the solid line in Figure 3a. Due to this additive deflection of the cardiac pole 8, the cross section C-C' (Figure 3b) and the electrode end 1)-D' (Figure 3C)
The relative positions of the accelerating electrode 8 with respect to the horizontal deflection electrode 7 and the 2× clean 21 are different between the two, and a -C difference occurs between the two in the vertical deflection sensitivity of the electron beam 23. In other words, as shown in FIG. When the distribution of the wholesaler trajectory of the electron beam 23 in the e' cross section is adjusted to the city regulation position (this setting Vi
FIG. 3C is performed by adjusting the deflection voltage of the vertical deflection electrode 4.
As shown in DD/cross section at the end, the distance between the accelerating electrode 8 and the screen 21 is short, so the path of the electron beam is shortened, the vertical deflection width of the electron beam forming one line is compressed, and the adjacent upper and lower A gap is created between the electron beam and the line. Since this tendency is continuously distributed between the c-c' section and the D-D' section [■,
The image formed by the two lines has a barrel shape as shown in Figure 3d, and black horizontal lines 24 that do not emit light appear from the center of the screen horizontally toward both ends of the screen, which is one of the causes of deterioration in image quality.

The maximum width of the 4j4 wire 24 varies depending on the 4-pole configuration and driving conditions, but in the case of this example, it has been determined by experiments and numerical calculations that it is approximately on the same order as the maximum deflection amount for an accelerating electric charge of 8. . Therefore, it is necessary to suppress the amount of deflection of the accelerating electrode 8 due to the Coulomb force as much as possible, but in order to provide sufficient vertical deflection sensitivity and acceleration with is the best, but because a tension system is used during assembly, the rigidity is insufficient and deflection occurs.Also, there is a method to suppress the Coulomb force by lowering the acceleration voltage, but since the electrons are not accelerated enough, There is a problem in that the brightness of the image decreases.Objective of the InventionThe present invention solves the above problems and makes it possible to obtain high-quality images by eliminating horizontal lines.

Structure of the Invention The image display device of the present invention has a special V (glass container has an inner surface shape that is 1 pl convex in the horizontal direction with the apex at the center so that the inner shape is parallel to the shape of the deflection curve of the accelerating electrode, and a phosphor is disposed on the glass container). It is a two-step process that eliminates inconsistencies between each line of the screen.

Description of examples An embodiment of the present invention will be described using FIG. 4.

The overall general structure of this embodiment is similar to the conventional embodiment shown in FIG. FIG. 4 shows a top view of the area between the horizontal and vertical electrodes 7 and the glass container 9, and the inner surface of the glass container 9 has a generally convex shape in the horizontal direction with the top at the center.
The curve giving the cross-sectional shape in the upward direction of the water is equal to the deflection curve of the accelerating electrode 8 due to the Coulomb force, that is, the accelerating electrode 8 and the screen 21 are designed to be parallel when the device is driven.

The cause of the horizontal line is the difference in the distance between the accelerating electrode 8 and the screen 21 between the center and the edge of the screen, as explained in FIGS. Therefore, the gist of the present invention is to make the distance between the two equal at all positions in the horizontal direction of the screen. The trajectory of the electron 23 after passing through the accelerating electrode 8 is the screen 2
The three-dimensional '
This has been made clear through FB beam trajectory analysis calculations, and theoretical V is also an effective means.

Effects of the Invention The present invention eliminates the misalignment between each line on the screen (referred to as 4M lines here) in a flat-panel image display device in which a plurality of line cathodes are installed in the vertical direction. It is possible to produce a uniform image of the product 11'f, and it has the feature that it can be easily realized by forming a gently curved surface on the glass surface.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a conventional image display device, FIG. 2 is a front view showing the structure of both sides of the conventional image display device, and FIG.
Figure a is a horizontal sectional view showing a part of a conventional image display device;
C/sectional view and D-D/sectional view, FIG. 3d is a schematic diagram showing the screen of a conventional image display device, and FIG. 1 is a horizontal cross-sectional view showing the following: 1... Back electrode, 2... Line cathode, 3...
... Vertical focusing electrode, 4 ... Vertical deflection electrode, 6 ... Electron beam flow control electrode, 6 ...
Horizontal focusing electrode, 7...Water 5r deflection electrode, 8...
...Acceleration electrode, e, 22...Glass container, 2
o...Fluorescent material, 21...Screen. Name of agent: Patent attorney Toshi Nakao (1 person: 81)
Figure 12 Figure 3 Figure 3 Figure 4 Figure 7 υ ■ ? 4

Claims (1)

[Claims] a plurality of linear hot cathodes, an electrode means for extracting an electron beam from the linear hot cathode, the electron beam control electrode means consisting of a plurality of electrodes, an electrode element 111 for deflecting the electron beam; electrode means for accelerating the electron beam, 4... and a display means coated with a 1□ body that emits light upon collision with the electron beam and has an inner surface having a horizontally convex shape with the top at the central portion; into a transparent vacuum gas container: an image display device having inside.