JPH01236558A - Image display device - Google Patents

Abstract

PURPOSE:To have effective connection of an internal electrode with an external drive circuit through resistance by connecting the internal electrode and an electrode takeout terminal with the end of a resistor. CONSTITUTION:A resistor 25 is formed by means of printing on that end face of a glass container 9 (22) which is sealed with frit. The internal electrode 5 an electrode takeout terminal 2d, which are consolidated in a conventional arrangement, are cut away, and resistor 25 is formed on the seal surface of the glass container 9 (22), and therewith the electrode takeout terminal 24 and internal electrode 5 are connected. This accomplishes the same effect as in case where such a resistor is interposed in series between an external drive circuit and internal electrode, and thereby destruction of drive circuit due to high voltage discharging is prevented to lead to provision of favorable effect in terms of cost and mounting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method of coating a phosphor in a vacuum container, causing the phosphor to emit light using an electron beam, and using deflection, focusing, and signal modulation means to create a television image. The present invention relates to an image display device for displaying images.

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 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 display. , it has not yet been put into practical use.

Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen on the screen vertically into multiple sections. Each time, the electron beam is deflected vertically to display multiple lines, and
Divide into multiple sections horizontally and set R, G, B for each section.
etc., to emit light sequentially, and the F? ,G.
There is a system that displays a television image as a whole by controlling the amount of electron beam irradiation on a phosphor such as a phosphor using a color video signal (Japanese Patent Laid-Open No. 57-135590
(see publication). FIG. 2 shows its basic configuration.

In FIG. 2, 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, an electron beam acceleration electrode 8 and a glass container 9.22 are arranged,
The components are placed in the glass container and evacuated.

The operation of the image display device configured as described above will be described below. First, 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. Here 2-2
(Only four pieces are shown). In this embodiment, it is assumed that 15 pieces are provided, and 2I to 2Y are provided. These line cathodes 2 are, for example, 10 to 207 m
An oxide cathode material is coated on the surface of a S 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 includes a line cathode 2 other than the line cathode 2 which is controlled to emit an electron beam for a period of time, which will be described later.
This function suppresses the generation of electron beams from the outside and pushes out the generated electron beams only in the forward direction. The back electrode 1 may be formed by a coating film of a conductive material adhered to the inner surface of the rear wall of the glass bulb.

Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used. Vertical focusing electrode 3
m is a conductive plate 11 having horizontally long slits 10 facing each of the line cathodes 2i to 2y;
The electron beam emitted from the is taken out through the slit 10 and focused in the vertical direction. slit 10
may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes arranged horizontally at small intervals (nearly touching), essentially serving as slits. may be configured. Vertical focusing electrode 3b
is also similar. A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 10, and each of the vertical deflection electrodes 4 includes conductors 13m and 13b provided on the upper and lower surfaces of an insulating substrate 12, respectively. ing. 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 directs the electron beam from one line cathode 2 into one direction in the vertical direction.
Deflect to the position of 6 lines. Then, the 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and as a result, the screen 21
The electron beam is deflected so as to draw 240 horizontal lines upward. Next, the electron beam flow control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of electron beam flow control electrodes 5 are arranged horizontally in parallel at predetermined intervals. In this configuration example, 320 control electrode conductive plates 1
5a to 15n are provided (only 10 are shown in the figure). Each of the electron beam flow control electrodes 5 separates and extracts the electron beam into one picture element in the horizontal direction, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element. Therefore, if 32,020 electron beam flow control electrodes 5 are provided, 32,020
Picture elements can be displayed. In addition, 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 5 is provided with the R, G, and B phosphors.
, G, and B video signals are sequentially added. Also, 320
320 sets of video signals for one line are simultaneously applied to the electron beam flow control electrode 5, and the video for one line is displayed at one time. The horizontal focusing electrode 6a is composed of a conductive plate 17 having a plurality of vertically long slits 16 (320 slits 16) facing the slits 14 of the electron beam flow control electrode 5, and each picture element divided in the horizontal direction. Each electron beam is focused horizontally into a fine electron beam. A plurality of horizontal deflection electrodes 7 are electrically conductive plates 1 arranged vertically at intermediate positions between the slits 16.
A horizontal deflection voltage is applied between each pixel to deflect the electron beam of each pixel in the horizontal direction, and sequentially light each of the R, G, and B phosphors on the screen 21. Illuminate it to make it emit light. The deflection range is
In this embodiment, each electron beam has a width of one picture element.

The electron beam accelerating electrode 8 is composed of a plurality of conductive wires 19 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 21 with sufficient energy. . The screen 21 is constructed by applying a phosphor 20 that emits light when irradiated with an electron beam to the back surface of a glass container 9, and adding a metal back layer (not shown).

The phosphor 20 is attached to one slit 14 of the electron beam flow control electrode 5, that is, to each slit 14 divided horizontally.
One phosphor of three colors R, G, and B is used for the electron beam of the book.
They are provided in pairs and are applied vertically in stripes. In FIG. 21, the broken lines drawn on the screen 21 indicate vertical divisions displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines indicate each of the plurality of electron beam flow control electrodes 5. Shows the horizontal divisions displayed corresponding to. As shown in the enlarged view in Figure 3, in one section partitioned by these two, there are R, G, and B phosphors 2o for one pixel in the horizontal direction, and one pixel in the vertical direction.
It has a width of 6 lines.

Note that in the figure, A is one section in the vertical direction, and B is one section in the horizontal direction. The size of one compartment is, for example, 1 gate in the horizontal direction and 16 gates in the vertical direction. Note that in FIG. 2, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity.

Further, in this embodiment, one electron beam flow control electrode 5, that is, R and G for one electron beam.

Although only one pair of phosphors 20 for one picture element is provided, it is of course possible to provide two or more picture elements, and in that case, the electron beam flow control electrode 5 has two or more picture elements. R, G, and B video signals are sequentially applied to the image, and horizontal deflection is performed in synchronization with the R, G, and B video signals.

The above is the general principle of the image display device.

Here, the sealing of the glass container (vacuum container) 9.22 is not described in detail, but is shown in FIG. 4a.

As shown in b, the glass container 9.22 is fired with a frit 23, and the internal electrodes 2 to 8 are taken out from the sealed area by the electrode take-out terminal 24. In addition, in FIG. 4, each of the internal electrodes 2 to 8 is shown in a simplified manner for easy understanding.

Problem to be Solved by the Invention Normally, a high pressure (approximately 10 V) is applied to the screen surface on which the phosphor 20 is applied, so the vacuum container 9.2
A high-pressure discharge occurs within the vacuum chamber 2, which occurs against the electrodes, leading to destruction of the drive circuit outside the vacuum vessel, which poses a serious problem.

Conventionally, when connecting the drive circuit and the electrode extraction terminal, it is customary to connect a resistor within the allowable range outside the container in series to prevent discharge. As can be seen, the large number of signal modulation electrodes or electron beam control electrodes (in fact, this is a big problem in terms of the cost of the resistor and the securing of mounting space).

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to enable extremely effective connection between internal electrodes and an external drive circuit using resistance.

Means for Solving the Problems In the image display device according to the present invention, a resistor is applied in advance to a part of the part where the electrodes are taken out from inside the vacuum container, that is, the part to be sealed with a frit. Internal electrodes and electrode extraction terminals are respectively connected to the ends of this resistor.

Effects According to this configuration, the same effect as when a resistor is provided in series between the external drive circuit and the internal electrodes can be achieved as in the past, and it is possible to prevent the drive circuit from being destroyed by high-pressure discharge. .

Embodiment FIG. 1 shows an enlarged view of a sealed portion of a glass container according to an embodiment of the present invention.

In the figure, 9.22 is a glass container for creating a vacuum. Reference numeral 5 denotes an internal electrode, which is shown here as a representative electrode for controlling the electron beam flow. Reference numeral 24 indicates an electrode extraction terminal, and 25 indicates a resistor, which are formed by printing on the end of the glass container 9 or 22 to be sealed with a frit. Conventionally, the internal electrode 5 and the electrode lead-out terminal 24 were integrated, but in this configuration, this is cut so to speak, and the resistor 25 is formed on the sealed surface of the glass container 9 or 22. , to which the electrode extraction terminal 24' and internal electrode 5 are respectively connected.

Effects of the Invention According to the present invention, as in the past, a resistor is formed on the sealing surface of the vacuum container, and internal electrodes and electrode extraction terminals are connected to this, thereby making it possible to connect a protective resistor to the outside. Since it is not necessary, it is a big effect in terms of cost and implementation.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional perspective view of essential parts of an image display device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the basic configuration of the image display element, and FIG. 3 is an enlarged view of the screen. Fourth
FIGS. 1 and 1b are a cross-sectional view and a cross-sectional view of essential parts showing a method for sealing a vacuum container. 5...Internal electrode, 9.22...Vacuum (
Glass) container, 24... Electrode extraction terminal, 2
5...Resistor. Name of agent: Patent attorney Toshio Nakao and one other WI
Figure 1 Figure 3

Claims (1)

[Claims] A resistor is placed in a part of the sealed part of a vacuum container, which is equipped with a screen coated with a phosphor that emits light when irradiated with an electron beam, and an internal electrode that focuses, deflects, and modulates the signal of the electron beam. and the internal electrode is taken out to the outside of the vacuum container through the resistor.