JPS5986139A - Flat plate type image display device - Google Patents

Abstract

PURPOSE:To make a rear electrode compact sharply by forming the rear electrode with a metal plate. CONSTITUTION:The inside surface of a glass container 41 is a part of a rear electrode 42 ad is adjacent to a spring section 43 that secures the rear electrode 42. That is, the rear electrode 42 is made of a metal plate (for example, SUS material), and the protruded spring section 43 is provided by etching a part of the said plate. In addition, the glass material 44 to which a conductive coat that makes contact with the rear electrode 42 adheres also plays the part of a post between it and an electrode 45 that is an electron beam extracting means. By using the metal plate as the rear electrode, the rear electrode can be made compact sharply as compared with the conventional glass plate. Namely, the rear electrode can be very economically supplied without requiring the adhesion process of the conductive coat.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat panel image display device, and in particular to a device that reduces the weight of the flat panel image display device by configuring the back electrode with a metal plate. It is.

Conventional Structure and Problems First, an example of the basic structure of the image display element used here will be described with reference to FIG.

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.
', a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal deflection electrode 7, a beam acceleration electrode 8, and a screen plate 9. It is housed inside a vacuum chamber.

In this 5, a vertical focusing electrode 3 is used as an electron beam extraction means, a beam flow control electrode 6 is used as an electron beam control means, vertical and horizontal deflection electrodes 4 and 7 are used as an electron beam deflection means, and a screen plate 9 is used as a light emitting means. I will do it.

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 wires, 2i to 22 are shown) are provided. In this embodiment, it is assumed that 15 pieces are provided. It will be from 2 to 2 evenings. These line cathodes 2 are, for example, 1
An oxide cathode material is applied to the surface of a tungsten wire having a diameter of 0 to 20 μΦ. 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 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, and
It functions to push out the generated electron beam only in the forward direction. ) 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, and extracts the electron beam cut out from the line cathode 2 through the slit 1o, and , vertically focused. (Slib) 10iJ: A bar may be provided at appropriate intervals in the middle, or a row of through holes arranged horizontally at small intervals (nearly touching each other). (may also be configured as a slit). The vertical focusing electrode 3' is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 1o, and conductors 13, 13' are provided on the upper and lower surfaces of the insulating substrate 12, respectively.
It consists of a set of Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13' to deflect the electron beam in the vertical direction. In this example,
A pair of conductors 13 and 13' deflects the electron beam of one line cathode to a position corresponding to 16 lines in the vertical direction.

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 are composed of conductive plates 16 each having a vertically long slit 14, and a plurality of control electrodes 5 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 320 conductive plates 15a to 15n for the 6'11 electrodes are provided (only 10 are shown in the figure). (The control electrodes 5 each direct the electron beam 1 time in the horizontal direction.)
Therefore, if 32,020 control electrodes 6 are provided, 320 pixels will be generated per horizontal line. can be displayed.

In addition, in order to display images in color, each picture element is R, G.
, B, and each control electrode 6
The R, G, and H video signals are sequentially applied to the . In addition, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 5, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of 320 long slits 16 in the vertical direction facing the slits 14 of the control electrode 6, and focuses the electron beam for each pixel divided in the horizontal direction. Each is focused horizontally into a narrow electron beam.

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 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 electron beam is accelerated 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 R9G and B for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam. It is applied vertically in stripes. In FIG. 2, 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. As shown in the enlarged view in Fig. 2, one section partitioned 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 1
The size of one section is, for example, 1 mm in the horizontal direction,
The vertical direction is 16.

Note that in FIG. 2, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity.

In addition, in this practical example, only one pair of R, G, and B phosphors 2o is provided for one picture element 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 the horizontal deflection is synchronized with the R, G, and B video signals for two or more picture elements. will be done.

The conventional flat panel image display devices described above have the following problems.

The above-mentioned flat panel image display device is composed of a glass container whose interior is evacuated and each of the above-mentioned electrodes is placed.
The thickness of the glass container is increased to prevent implosion from atmospheric pressure, and the use of a glass plate for the electrodes placed inside, such as the back electrode, makes the device extremely heavy, making it difficult to carry or put into practical use. It had some unreasonable flaws.

OBJECTS OF THE INVENTION The present invention attempts to eliminate the above-mentioned drawbacks of the prior art by constructing the back electrode with a metal plate.

Structure of the Invention The flat panel image display device of the present invention includes a back electrode in a vacuum glass container, a line cathode as an electron beam source, an electron beam extraction means for extracting an electron beam from the line cathode, and a means for controlling the electron beam. It is equipped with an electron beam control means, an electron beam deflection means for deflecting the electron beam, and a light emitting means for emitting light by the collision of the electron beam, and the back electrode is a metal plate. It is characterized by the fact that it is made of

Example Child board) 111j picture IA in one embodiment of the present invention! The display device will be explained using FIG. 3 showing the main parts thereof. The inner surface of the glass container 41 is a part of the back electrode 42 and is connected to the spring part 43 of the back electrode 42. U, 1.)
Side 1'II! : Pole 42 is a metal plate (for example, SUS)
The thickness is 20011m, and the size is 120mmX.
It is 85mm.

This is the size of a conventional glass plate.

Part of this is etched, and the protruding spring part 43 is made as shown above.
will be established. Furthermore, the glass material 44t/i to which the conductive film is attached and in contact with the back electrode 42 also serves as a support between the electrode 46 which is the electric beam extraction means. Note 4
6 is a line cathode.

As described above, by using the gold λt14 plate for the back electrode, there is an effect that it can be softened to a greater degree than the conventional glass plate. Furthermore, when using a glass plate as in the past, a process for attaching a conductive film was required, but when a metal plate is used as in the present invention, such a process for attaching a conductive film is not required. , the back electrode can be provided at an extremely low cost.

[Brief explanation of the drawing]

FIG. 1 shows the basic configuration of a flat panel image display device.
FIG. 2 is an enlarged view of a main part of a screen plate of the same device, and FIG. 3 is a perspective view of a main part of a flat panel image display device according to an example of the present invention. 41... Glass container, 42... Back electrode, 4
3-Protruding spring portion, 44...Glass plate, 45.
...Electron beam extraction electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4?

Claims (2)

[Claims] (1) A back electrode in a vacuum glass container, 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 control means for controlling the electron beam, A flat plate image display device, comprising an electron beam deflection means for deflecting an electron beam, and a light emitting means for emitting light upon impact of the electron beam, and wherein the back electrode is composed of a metal plate. . (2) Claim 1, characterized in that the back electrode has a plurality of elastic protrusions formed by cutting and raising a part thereof, and the protrusions are in contact with the inner surface of the vacuum glass container. The flat panel image display device described in 2.