JPS625544A - Image display device - Google Patents

Abstract

PURPOSE:To realize vertical deflection with a low voltage and a thin type device with reduction of size between the phosphor material display screen and an acceleration electrode by forming an electron beam acceleration electrode in such a structure as combining a flat electrode having the slit and a protruded member electrode. CONSTITUTION:A flat type image display device can be formed by arranging a plurality of line cathodes, focusing electrode, deflection electrode, control electrode and acceleration electrode, etc. between a rear electrode and a screen and then sealing such elements with a glass case 9. In this case, the acceleration electrode is formed in combination with a flat electrode 8 providing the slits in the same number as the horizontal focusing electrode 6a and a protruded member electrode 23 which is fixed by welding on such member and moreover a holding plate 19 is provided in opposition to the phosphor display screen 20. Accordingly, a large lens of diversion system can be formed with the field of the electrodes 8, 23, the size between the acceleration electrode and phosphor display screen can be made small by vertical deflection with a low voltage. Thereby, a thin image display device which assures low power consumption can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device in video equipment.

Conventional technology Conventionally, 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 manufacture thin television receivers. It was impossible to do so.

In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have been developed in recent years as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display. , it has not yet been put into practical use. Therefore, we aimed to achieve a device that can display color television images directly on a flat display using electron beams, and the screen was divided vertically into multiple sections. For each section, the electron beam is deflected vertically to display multiple lines, and further divided horizontally into multiple sections to display R, G,
The phosphors such as B are made to emit light sequentially, and the R and G phosphors are made to emit light sequentially.

A television image is displayed as a whole by controlling the amount of electron beam irradiation onto a phosphor such as B using a color video signal. An example of a conventional image display element will be described below with reference to the drawings. Figures 4, 5, 6, and 7.

FIG. 8 shows a conventional image display element.

In FIG. 4, from the back to the front, the back electrode 1, the line cathode 2 as an electron beam source, and the vertical focusing electrode 3a.
, 3b, a vertical deflection electrode 4, an electron beam flow control electrode 5, horizontal focusing electrodes 6a and 6b, a horizontal deflection electrode 7, a deflection electrode, an electron beam accelerating electrode 8, and a glass container 9.22 are arranged, and the above-mentioned Place the components in a glass container and create a vacuum. The operation of the image display device configured as described above will be described below. First, as an electron beam source, a line cathode 2 is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. (only four pieces 2a to 2d are shown). In this example, it is assumed that 16 pieces are provided, and 2 pieces are provided.
A to 2Q. These line cathodes 2 are, for example, 10 to 3
An oxide cathode material is coated on the surface of a 0 μmφ tungsten wire. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a for a fixed period of time. The back electrode 1 suppresses the generation of electron beams from line cathodes 2 other than the line cathode 2 that is controlled to emit electron beams for a certain period of time, which will be described later, and directs the generated electron beams only in the forward direction. It has the effect of pushing out toward the target.

The back electrode 1 may be formed by a coating of electrically conductive material applied to the inner surface of the back wall of the glass pulp. Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used. The vertical focusing electrode 3a is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2a to 2o. Focus. The slit 1Q may be provided with crosspieces at appropriate intervals in the middle, or at small intervals in the horizontal direction (the intervals are such that they almost touch each other).
The through hole may be substantially configured as a slit by a row of a large number of through holes arranged side by side. The vertical focusing electrode 3b is also similar. The vertical deflection electrode 4 is connected to the slit 1o.
A plurality of insulating substrates 12 are arranged horizontally at intermediate positions between the two, and conductors 13a and 13b are provided on the upper and lower surfaces of an insulating substrate 12, respectively.

Then, a vertical deflection voltage is applied between the opposing conductors 13a and 13b to deflect the electron beam in the vertical direction. In this configuration example, the pair of conductors 13a and 13b deflects the electron beam from one line cathode 2 to positions corresponding to 16 lines in the vertical direction. Then, by means of the 16 vertical deflection electrodes 4, one corresponding to each of the 16 line cathodes 2 is formed.
Five pairs of conductors are constructed, and the electron beam is ultimately deflected to draw 240 horizontal lines on the screen 21. Next, the electron beam flow control electrodes 6 are each composed of conductive plates 16 having vertically long slits, and a plurality of them are arranged in parallel in the horizontal direction at predetermined intervals. In this configuration example, 320 control electrode conductive plates 15a~
15n (only 10 are shown in the figure).

Each of the electron beam flow control electrodes 5 divides the electron beam horizontally into one picture element and extracts the electron beam, and
The amount of passage is controlled according to the video signal for displaying each picture element. Therefore, if 32,020 electron beam flow control electrodes 6 are provided, 320 picture elements can be displayed per horizontal line. Furthermore, in order to display images in color, each picture element is displayed using phosphors of three colors, R, G, and B, and each electron beam flow control electrode 6 has the R, G color.

Each video signal of B is added sequentially. Furthermore, 320 sets of video signals for one line are simultaneously applied to the 320 electron beam flow control electrodes 5, so that one line of video is displayed at one time. The horizontal focusing electrode 6a has a plurality of long electrodes (32
Consisting of a conductive plate 17 having 0 slits 16,
The electron beams for each picture element divided in the horizontal direction are focused in the horizontal direction to form fine electron beams.

The horizontal deflection electrode 7 is made up of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal deflection voltage is applied between each conductive plate 18 for each pixel. The electron beams are respectively deflected in the horizontal direction, and the R, G, and H phosphors are sequentially irradiated on the screen 21 to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam. The electron beam accelerating electrode 8 has the same number of sulins as the horizontal actual speed electrode 6b) &
The electron beam is made up of flat plate electrodes with sufficient energy to accelerate the electron beam so that it collides with the screen 21.

The screen 21 is constructed by coating the back surface of the glass container 9 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown).

The phosphors 20 are phosphors of three colors R, G, and B for one slit 14 of the electron beam flow control electrode 6, that is, for each one electron beam divided in the horizontal direction. is 1
They are provided in pairs and are applied in vertical stripes. In FIG. 3, broken 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 two-dot chain lines indicate each of the plurality of electron beam flow control electrodes 6. Shows the horizontal divisions displayed corresponding to. In one section partitioned by these two, as shown enlarged in Fig. 4, there are R, G, and B phosphors 2o for one picture element in the horizontal direction, and 16 in the vertical direction.
It has the width of a line. Note that A in the figure is 1 in the vertical direction.
B is one horizontal division. The size of one section is, for example, 1 wn in the horizontal direction and 16 mm in the vertical direction.

Note that in FIG. 6, the length in the horizontal direction is greatly expanded relative to the vertical direction for the sake of clarity. In addition, in this embodiment, only one pair of R, G, and B phosphors 2o is provided for one picture element for one electron beam flow control electrode 6, that is, for one electron beam. Of course, more than two picture elements may be provided; in that case, R, G, and B video signals for two or more picture elements are sequentially applied to the electron beam flow control electrode 6, and the horizontal deflection is synchronized with the R, G, and B video signals for two or more picture elements. will be done. The above is the general principle of the image display device.

Problems to be Solved by the Invention However, in the above-described configuration, as shown in FIG. 5, the penetration of the electric field is small and the vertical deflection sensitivity is small. For this reason, the distance between the electron beam accelerating electrode 8 and the phosphor is increased, and the voltage for vertical deflection is increased. As a result, there have been problems in that the panel thickness cannot be reduced and the power consumption is also high.

In view of the above problems, the present invention provides an image display device with a reduced panel thickness and low power consumption.

Means for Solving the Problems In order to solve the above-mentioned problems, the image display device of the present invention has a projecting horizontal crosspiece of the same potential on the back electrode side of the flat electron beam accelerating electrode. It has a configuration in which it is installed on a horizontal crosspiece of a beam accelerating electrode.

Operation The present invention, with the above-described configuration, increases the bending of the electric field toward the back electrode side of the electron beam accelerating electrode, and makes it easy to deflect the electron beam in the vertical direction by using the entire configuration of a large diverging electron lens. As a result, the vertical deflection voltage can be lowered, resulting in lower power consumption.

Furthermore, the distance between the electron beam accelerating electrode and the phosphor screen can be shortened, and the thickness of the panel can be reduced.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an electron beam accelerating electrode block of an image display device according to an embodiment of the present invention.

In FIG. 1, 6a is a horizontal focusing electrode, 8 and 23 are electron beam accelerating electrodes, 19 is a support plate, and 24 is a frame.

9 is a glass container with R and G on the inner wall.

A phosphor surface that emits B color is provided as in a conventional cathode ray tube. The electron beam accelerating electrode 8 is provided with the same number of holes as the horizontal focusing electrode 6a, and is welded to the frame 24. As shown in the figure, the electron beam accelerating electrode 23 is
It is welded and fixed on the crosspiece of the electron beam accelerating electrode. The support plate 19 is welded and fixed to the horizontal crosspiece of the electron beam accelerating electrode 8 and the vertical inner wall of the frame 24. Horizontal focusing electrode 6a
There is an insulating spacer between the electron beam accelerating electrode 80 and the hole-free part around the electrode, and each electrode is
Positioned via a reference bin (not shown), the backing device 2
2 and the glass container 90 and are fixed. The phosphor screen on the inner surface of the frame 24 and the glass container 9 is
Fixed and electrically connected.

The electrode between the horizontal focusing electrode 6a and the copying device 22 is constructed in the same manner as in the conventional example.

The operation of the image display device configured as described above will be described below with reference to FIGS. 1 and 2.

First, Figure 2 shows the equipotential surface of the electric field on a plane cut horizontally at the slit center.As is clear from comparison with Figure 5, the electron beam acceleration electrodes 8 and 2
3, a large diverging lens is constructed. As a result, the electron beam is in principle directed in the normal direction of the equipotential surface of the electric field, so that even if the vertical deflection is small at the position of the vertical deflection electrode, it can be largely deflected. Furthermore, since there is almost no electric field between the electron beam accelerating electrode 23 and the phosphor screen, the beam bent by the vertical deflection electrode 4 and the above portion passes through the hole in the electron beam accelerating electrode 23 in the same direction. Since the electron beams fly toward the phosphor screen, the distance between the electron beam accelerating electrode 23 and the phosphor screen can be reduced.

As described above, according to this embodiment, the electron beam accelerating electrodes 8 and 23 are provided, and the vertical deflection of the beam is performed at a low voltage due to the lens effect of the electric field caused by the electrodes 8 and 23, and the panel can be made thinner.

Effects of the Invention As described above, the present invention uses a combination of a planar electrode with a slit and a protruding branch electrode as an electron beam accelerating electrode to perform vertical deflection at a low voltage, thereby creating a space between a phosphor screen and an electron beam accelerating electrode. The dimensions of can be reduced. As a result, the image display device achieves the effects of low power consumption and thinning.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an electron beam accelerating electrode block of an image display device according to an embodiment of the present invention, FIG. 2 is a diagram showing the electric field state in a vertical section of the electron beam accelerating electrode block, and FIG. 3 is a conventional FIG. 4 is an enlarged plan view of the suffix IJ+, and FIG. 6 is a diagram showing the state of the electric field in a vertical section of a conventional electron beam accelerating electrode block. 26... Equipotential surface, 26... Beam trajectory. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 82 Figure GcL Figure 4 Figure 5 a 2Ea, 2Cb 2rc

Claims (1)

[Claims] In a flat display device that has a plurality of cathodes between a back electrode and a screen, and a plurality of electrodes that are substantially planar, and has at least one side sealed with a glass container, a flat display device that has a flat plate shape and has the same potential as the phosphor screen. an electron beam accelerating electrode having holes corresponding to the holes through which the beams of the plurality of electrodes pass; and an electron beam having a protruding crosspiece shape on a crosspiece portion between the holes on the side surface of the back electrode of the electron beam accelerating electrode. An image display device comprising: an accelerating electrode.