JPS59112548A - Flat plate type picture display device - Google Patents

Abstract

PURPOSE:To improve resolution and obtaining a clearer picture by making the electron beam passing holes of the respective electrodes of electron beam extraction and control means have a mutual opposed positional relationship and making the pitches equal to each other. CONSTITUTION:An electron beam extraction means 51 is manufactured by etching a hole 54 of approximately 0.6mm. in diameter at a pitch of 1mm. and is installed immediately under a linear cathode. An electron beam control means 53 is manufactured by etching a hole 55 of 0.5mm. in diameter at a pitch of 1mm. in the same way of the electron beam extraction means 51. The electrons emitted from the linear cathode passes through the respective holes of the electron beam radiation beam 51 and are incident on the respective holes 55 of the electron beam control means 53. That is to say, if the respective holes are provided at the same pitch so that the respective holes of the electron beam means and those of the electron beam control means can be made to have an opposed positional relationship, the electron beam that passes through the respective holes is incident on the corresponding holes without being diffused.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a flat panel image display device.

(Structure of conventional example and its problems) An example of a basic structure of an image display element is shown in FIG. 1 and will be described.

This display element includes, in order from the back to the front, a back electrode 1, a line cathode 2 as a beam source, and a vertical focusing electrode 3.3'.
, a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal polarization electrode 7, a beam acceleration electrode 8, and a screen 9 are arranged, and these are made of flat glass pulp (not shown). The interior is housed in a vacuum.

Here, a vertical ITl focusing electrode 3 is used as an electron beam extraction means, and a beam flow control electrode 5 is used as an electron beam 4 control means.
, vertical and horizontal deflection electrodes 4 and 7 as electron beam deflection means.
, a screen 9 serves as a light emitting means, respectively.

A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of line cathodes 2 (here, Only four (2a to 2d are shown) are provided. In this embodiment, 15 pieces are provided, and the angle is 2a to 2°. These line cathodes 2 are, for example, io
An oxide cathode material is coated on the surface of a tungsten wire of ~20 μφ. And, as explained later,
'' The line cathode 2a is controlled to emit an electron beam sequentially for a certain period of time (the back electrode 1 is controlled to emit an electron beam from one line cathode 2a for a certain period of time). (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 film of gold powder applied to the inner surface of the rear wall of the glass pulp. Further, a planar electron beam emitting cathode may be used instead of the back electrode l and the linear cathode 2.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 10 facing each of the line cathodes 2a to 2o. (The slits 10 may be provided with crosspieces at appropriate intervals in the middle, or a row of through holes arranged horizontally at small intervals (so that they almost touch each other) may be configured substantially as a slit). The vertical focusing electrode 3' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 10, and are each composed of conductors 13 and 13' provided on the upper and lower surfaces of an insulating substrate 12. ing. Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13' to vertically (deflect the electron beam in one direction. In this embodiment, the pair of conductors 13 and 13' The electron beam from the book line cathode 2 is vertically deflected to a position corresponding to 16 lines.

The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and the electron beams are deflected to draw 240 horizontal lines on the screen 9. do.

Next, the control electrodes 5 (each of which divides the electron beam into l picture elements in the horizontal direction and extracts it, and controls the amount of the electron beam passing therethrough in accordance with the video signal for displaying each picture element) each It is composed of conductive plates 15 having one slot in the vertical direction and 1.14 in the conductive plate 15, and a plurality of conductive plates 15 are arranged in parallel in the horizontal direction at a predetermined interval. In this example, 32
Zero conductive plates 15a to 15n for control electrodes are provided (only 10 are shown in the figure). Therefore, if 32,020 control electrodes 5 are provided, 320 pixels can be displayed per horizontal line. In order to display images in color, each picture element is displayed with phosphors of three colors, R, G, and B, and each control electrode 5 receives each of the R, G, and B image signals. are added sequentially.

-, 320 control electrodes 5 have 32
A video signal of 011i11 is added at the same time, and one line of video is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 facing the slits 14 of the control electrode 5, that is, 320 slits 16, and collects electrons for each pixel divided in the horizontal direction. Each beam is focused horizontally into 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 above-mentioned s') y) 16, and a horizontal deflection voltage of V is applied between each of the conductive plates 18. , the electron beams for each picture element are respectively deflected in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 9 to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam.

The acceleration electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4.
The electronic beam 7 is accelerated so as to collide with the screen 9 with sufficient energy.

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

The phosphors 20 are provided with one pair of phosphors of three colors R1G and B for each slit 14 of the control electrode 50, that is, for each one horizontally divided electron beam. , applied in vertical stripes. In FIG. 1, the broken lines drawn on the screen 9 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 correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. In one section partitioned by these two, as shown enlarged in Fig. 2, there are R, G, and B phosphors 2o for one pixel in the horizontal direction, and 16 lines in the vertical direction. It has a width of 30 minutes. 1
The size of each section is, for example, 1 question in the horizontal direction and 16 questions in the vertical direction.

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

In this embodiment, only one pair of R, G, and H phosphors 20 for one picture element is provided for one control electrode 5, that is, one electron beam, but two picture elements are provided. Of course, two or more pairs may be provided, and in that case, R-, G, and B video signals for two or more picture elements are sequentially applied to the control electrode 5, and horizontal A deflection is made.

The flat panel image display device as described above has the following problems. This will be explained using FIG.

In the first electrode configuration, the back electrode 1, the line cathode 2, and the vertical focusing electrode (electron beam extraction φ stage) 3 are arranged in this order, so that the electrons emitted from the line cathode 2 are widely diffused, and the beam flow control electrode (Electron beam control means) The electrons just before entering 5 will enter not only from the right angle but from various angles. Therefore, the size of the electron beam spot 41 on the screen plate 9 is 300 m.
The diameter was extremely large, ranging from mφ to 600 mmφ, resulting in a decrease in resolution and the problem that it was difficult to provide a clearer image.

(Object of the Invention) The present invention provides that the electron beam passing holes of the respective electrodes of the electron beam extracting means and the electron beam controlling means are arranged in a positional relationship corresponding to each other, and the pitches of the electron beam passing holes are made equal to each other. This is an attempt to solve the above problems.

(Structure of the Invention) As shown in FIG. 4, the present invention includes an electron beam extraction means 51, a vertical deflection electrode 52 for vertically deflecting the electron beam,
This is a flat panel image display device having an electrode configuration in which an electron beam control means 53 is arranged.

(Explanation of Examples) An embodiment of the present invention will be described using FIGS. 4 and 5.

Although the electron beam extraction means may have a plurality of pieces, it will be explained here as one piece. Electron beam extraction means 5
1 is a metal plate, for example, a 42-6 alloy plate (42%Ni +
6% Cr, 52% Fe) with a thickness of 0.2 + mn, holes 54 of about 0.6 mm diameter were drilled and drilled at one pitch, and installed directly below the wire cathode. Vertical deflection electrode 52
The electrodes are formed by gold vapor deposition on a glass 7 plate with a thickness of 2 mm. The electron beam control means 53, in exactly the same way as the electron beam extraction means 51, opens a hole 55 with a width of 0.5 inch into a
It is made by f-ching into a pus pit. When each electrode manufactured in this way is arranged in the configuration shown above, the electrons emitted from the line cathode are transferred to the electron beam extraction means 51.
The electron beam passes through the neck hole 54 of the electron beam and enters the neck hole 55 of the electron beam control means 53 as shown in FIG.

In other words, if the neck holes of the electron beam extraction means and the neck holes of the electron beam control means are arranged in a corresponding positional relationship and the neck holes are provided at the same pitch, the electron beams passing through each hole will not diverge. It can be seen that the light enters the corresponding hole without any problem. However, the voltage of each electrode in [■J-Example] is, for example, about -20 to +IOV for the electron beam extraction means 51;
The best point can be selected for the vertical deflection electrode 52 in the range of about -50 to +20V, and for the electron beam control means 53 in the range of about +30 to ±100V.

(Effect of the invention) When the size of the electron beam spot is measured with the above electrode configuration and driving conditions, it is 50+nmφ to 150nmφ.
It is possible to obtain an extremely small spot diameter, which has the effect of providing higher resolution and clearer images.

[Brief explanation of drawings]

Figure 1 shows an example of a basic configuration of an image display element]/1
, FIG. 2 is an enlarged view of the screen, FIG. 3 is an explanatory diagram of problems in the conventional example, and FIG. 4 is a partial perspective view of an embodiment of the present invention.
FIG. 5 is a diagram showing the positional relationship of the electron beam passage holes. 2 &! Cathode, 7. Horizontal deflection electrode, 10. Slit, 51. Electron beam extraction means, 4.52. Vertical deflection electrode, 53. Electron beam control means, 54° 55
- Hole. Figure 2 Figure 3

Claims (1)

[Claims] A line cathode as an electron beam source, an electron beam extraction means for extracting an electron beam from the line cathode, an electron beam vertical deflection means for vertically deflecting the electron beam, an electron beam control means for controlling the electron beam, electron beam horizontal deflection means for horizontally deflecting the electron beam;
In a flat panel image display device in which light emitting means emitting light upon impact of an electron beam are arranged in order, an electron beam passing hole of an electrode as the electron beam extraction means;
A flat panel image display device characterized in that the electron beam passing holes of the electrode as the electron beam control means are in a positional relationship corresponding to each other, and the pitches of the electron beam passing holes are equal to each other.