JPS63110530A - Plate-shaped picture image display device - Google Patents

Abstract

PURPOSE:To substantially reduce the number of electrode terminals to take out and the number of drive circuits by separating an electron beam control beams into N groups, electrically connecting respective electrodes in each group and dividing electron beam focusing means into N. CONSTITUTION:To minimize the number of connecting terminals and the number of drive circuits 240 vertical scanning electrodes 2 are divided by 16 to form 16 groups of 15 each, and 15 electrode terminals in each group are connected in sequence between the groups, and 15 electrode terminals are taken outside of a panel. On the other hand, a focusing electrode 4 is divided into 16 in the same direction as the vertical scanning electrode 2 to form 16 focusing electrodes, and 16 electrode terminals are taken outside of the panel. By this method, 241 electrode terminals conventionally required to be taken out of a panel for the vertical scanning electrodes 2 and the focusing electrodes 4 are reduced to 31.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat panel image display device used in color television receivers, computer terminal displays, and the like.

2. Description of the Related Art As a cathode ray tube having a deflection electrode for electrostatically deflecting an electron beam, there is a flat cathode ray tube having a structure shown in FIG. In reality, each electrode is housed in a vacuum envelope (glass container), but the vacuum envelope is omitted in the figure to make the internal electrodes clear. Further, in order to clarify the horizontal and vertical directions of the screen on which images, characters, etc. are displayed, the horizontal direction (H) and vertical direction (V) are illustrated on the face plate portion.

Reference numeral 10 denotes a linear cathode, which is formed by coating the surface of a tungsten wire with an oxide cathode material and is long in the direction (1). A plurality of cathodes 10 are arranged independently at equal intervals in the horizontal direction. Linear cathode 1o
On the opposite side of the face plate part 28, vertical scanning electrodes 12 are arranged on the insulating support 11 in close proximity to the linear cathode 1o, at equal pitches in the vertical direction, and electrically divided and elongated in the horizontal direction. is placed. These vertical scanning electrodes 12 correspond to the number of horizontal scanning lines in the vertical direction (approximately 4 in the case of NTSC system) if normal television images are displayed.
80% of the electrodes are formed as independent electrodes. Next, between the linear cathode 10 and the face plate portion 28, there are arranged the lines from the linear cathode 10 side.

A planar electrode having holes corresponding to the cathode 10 and the vertical scanning electrode 12 is divided between adjacent linear cathodes 10, and a video signal is applied to each electrode to perform beam modulation. 1 grid electrode (hereinafter referred to as G1) 13, G1
A second grid electrode (hereinafter referred to as G2) 14 and a third grid electrode (hereinafter referred to as G3) 15 having openings similar to those of the electrode 13 and not divided in the horizontal direction are arranged. The G2 electrode 14 is for generating one beam from the linear cathode 1o, and the G3 electrode 15
is for shielding the electric field generated by the subsequent electrode and the beam generation electric field. Next, a fourth grid electrode (hereinafter referred to as G4) 16 is arranged, and its opening is larger in the horizontal direction than in the vertical direction.

FIG. 4(A) shows a horizontal cross section of FIG. 3, and FIG. 4(B) shows a vertical cross section. At the rear of the G4 electrode 16, two electrodes 17 and 18 having apertures that are sufficiently wider in the horizontal direction than in the vertical direction, similar to the apertures in the G4 electrode 1e, are arranged, as shown in Fig. 4 CB)K. A vertical deflection electrode is formed by vertically shifting the center axes of the openings of the two electrodes.

A linear cathode 10 is provided after the vertical deflection electrodes 17 and 19.
A vertically long electrode is provided between each face plate portion 28.
Multiple stages are provided towards the side. Figure 3 shows 3 as an example.
The case of a stage is shown, and each electrode is connected to the first horizontal deflection electrode (
1 g (hereinafter DH-1), 1 g second horizontal deflection electrode (hereinafter DH-2)
) 20, third horizontal deflection electrode (hereinafter referred to as DH-3) 21,
The horizontal deflection electrodes 19 to 21 are connected to the common bus bar 22, 23, 24 every other horizontal direction.

The same voltage as the DC voltage applied to the metal back electrode 26 of the face plate section 28 is applied to the DH-3 electrode 21, and the DH-1 electrode 19. A voltage for horizontal focusing of the beam is applied to the DH-2 electrode 20. A light emitting layer consisting of a fluorescent surface 27 and a metal back electrode 26 is formed on the inner surface of the face plate portion 28 . When displaying in color, the fluorescent surface sequentially displays red (R), green (G), and blue (
B) The phosphor stripes are formed through a black guard band.

Next, the operation of the color cathode ray tube will be explained. heating the linear cathode 10 by passing an electric current through it;
G1 electrode 13. The same voltage as the potential of the cathode 1o is applied to the vertical scanning electrode 12. At this time G1. G2 electrode 1
3.14 from the cathode 10, and a voltage higher than the potential of the cathode 10 (for example, 100 to 300 V) is applied to the G2 electrode 14 so that the beam passes through each electrode aperture. Here the beam is G1. The amount of G2 that passes through each hole in the pole is controlled by changing the voltage on the G1 electrode 13. The beam passing through the aperture of the G2 electrode 140 proceeds to the G3 electrode 15 → G4 electrode 16 → vertical deflection electrodes 17, 113 → horizontal deflection electrodes 19, 20, 21. A predetermined voltage is applied so that the spot becomes small. Here, the beam focus in the vertical direction is determined by the G3 electrode 15. G4
is performed by an electrostatic lens formed between the pole 16 and vertical deflection electrodes 17 and 19, and the beam focus in the horizontal direction is D.
This is performed using an electrostatic lens formed between each of H-1, DH-2, and DH-3. The two electrostatic lenses are formed only in the vertical and horizontal directions, respectively, so that the vertical and horizontal spot sizes of the beam can be adjusted individually.

Also DH-1 (19), DH-2 (20).

Busbars 22, 23゜2 connected to DH-3 (21)
4 is applied with a sawtooth wave, triangular wave, or staircase wave deflection voltage with the same voltage and horizontal scanning period, deflecting the electron beam in the horizontal direction by a predetermined width, and scanning the fluorescent surface 26 with the electron beam. Obtain a luminescent image.

Next, vertical scanning will be explained using FIG. 5.

As described above, by controlling the voltage of the vertical scanning electrode 12 so that the potential of the space surrounding the linear cathode 1o becomes a positive or negative potential compared to the potential of the linear cathode 10, Generation of electrons from cathode 1o is controlled. At this time, if the distance between the linear cathode 1Q and the vertical scanning electrode 12 is small, a beam is generated from the cathode (hereinafter O
N), 6 The voltage for controlling OFF may be small.

In the case of the current television system that uses an interlaced system, a predetermined deflection voltage is applied to the vertical deflection electrodes 19 and 19 for one field in the first field, and 12A of the vertical scanning electrode 12 is applied with a predetermined deflection voltage. The beam modulation electrode is applied only during one horizontal scanning period (hereinafter referred to as 1H), and the beam OFF voltage is applied to the other vertical scanning electrodes 12B to 12Z. After 1H, 1H is applied only to 12B of vertical scanning electrode.
During the beam ON voltage, a voltage is applied to the vertical scanning electrode to turn on the beam only for 1 hour, and the beam is turned on at 1 at the bottom of the screen.
22, the vertical scanning of the first field is completed. The next second field is the vertical deflection electrode 17.19
The polarity of the deflection voltage applied to the field is reversed, and this is applied for one field. The signal voltage applied to the vertical scanning electrode 12 is applied in the same manner as in the first field. At this time, the first
The amplitude of the deflection voltage applied to the vertical deflection electrodes 17 and 18 is adjusted so that the horizontal scanning line of the second field is between the horizontal scanning line positions of the beam caused by the vertical scanning of the field. As described above, the vertical scanning electrode 12 has the first. Second
The same vertical scanning signal voltage is applied to both fields, and one frame of vertical scanning is completed by changing the deflection voltages applied to the vertical deflection electrodes 17 and 113 between the first field and the second field.

Next, we will discuss a generally well-known method for the signal processing system until the video signal is applied to the beam modulation electrode of a cathode ray tube that has a plurality of beam generation sources in the horizontal direction, such as the above-mentioned flat-type cathode ray tube. This will be explained using Figure 6.

Timing pulse generator 4 based on TV synchronization signal 42
4, a timing pulse is generated to drive a circuit block to be described later. First, the three primary color signals of R, G, and B (ER, EG,
EB) 41 is converted into a digital signal by an A/D converter 43, and the 1H signal is input to the first line memory circuit 45.

When all the signals for 1H are input, the signals are simultaneously transferred to the second line memory circuit 46, and the next 1H signal is also input to the first line memory circuit 45.

The signal transferred to the second line memory circuit 46 is 1H
The D/A converter (
Alternatively, the signal is sent to the pulse width converter) 47, where it is converted into the original analog signal (or pulse width modulation signal), amplified, and applied to the modulation electrode G1 of the cathode ray tube. Such a line memory circuit is used for time axis conversion.

Problems to be Solved by the Invention In such a conventional configuration, the number of electrode terminals of the vertical scanning electrode 12 is extremely large, and the number of circuits for driving the vertical scanning electrode 12 is also large, making it expensive. Furthermore, the conventional configuration has the problem that the reliability is lowered as the number of connection terminals with the circuit increases.

Means for Solving the Problems In the present invention, in order to solve the above-mentioned conventional problems,
The M short fence-shaped vertical scanning electrodes, which are one means of electron beam control, are divided into N groups, and the vertical scanning electrodes in each group are not electrically connected to each other, but between each group, each electrode are electrically connected, and the other electron beam focusing means is divided into N pieces.

Operation According to the configuration of the present invention, if the M vertical scanning electrodes are divided into N groups, and the electrodes corresponding to the condyle are electrically connected between each group, the number of terminals to be taken out to the outside is as follows. M=KN−α(
α<K) This means that the number of books decreases from one book to another. On the other hand, by dividing the focusing electrode facing the cathode filament, which is a linear electron source, into N pieces in the direction intersecting the vertical scanning electrode, the number of terminals to be taken out to the outside increases from 1 to N pieces. However, the total number of extraction terminals (M+ 1=
It can be significantly reduced from KN-a) books to (K+N) books.

Embodiment FIG. 1 is a perspective view of essential parts of a flat panel image display device of the present invention. Glass plate 1 and 24 with 11 pitches vertically on it
Zero vertical scanning electrodes 2 are formed of a transparent conductor film.

The cathode 3 has a diameter of 30 to 40 μm and is made of a tungsten core wire coated with an oxide cathode material such as BaO.

The planar electron beam focusing electrodes 4, 5.6 are formed by etching a 42-6 alloy plate. Here, the focusing electrode 4 is 0.
．． Electron beam passing holes f 1 rs of 48φ are arranged along the cathode and corresponding to the vertical scanning electrodes.

In order to minimize the number of connection terminals and drive circuits, 24
0 vertical scanning electrodes 2 are divided into 16 groups of 15 electrodes each to form 16 groups, and the 15 electrode terminals in each group are sequentially connected between each group to form 15 electrode terminals on the outside of the panel. Take out. On the other hand, the focusing electrode 4 is divided into 16 parts in the same direction as the dividing direction of the vertical scanning electrode 2 to form 16 focusing electrodes, and 16 electrode terminals are taken out from the outside of the panel. As a result, the panel which conventionally had 241 electrode terminals for the vertical scanning electrode 2 and the focusing electrode 4 has been reduced to 31 electrode terminals.

Further, the operation of this panel will be explained using FIG. 2. Since the vertical scanning electrodes 2 form groups of 16 each, a 15-phase pulse generator (pulses t-2φ1, 2φ2, and °° as shown in FIG. 2 and 4) is used.

..., is sequentially applied to each vertical scanning electrode 2 up to 2φ16. The applied voltage value at this time is approximately 60 to aOV. At this time, when a pulse voltage of, for example, 2φ1 is applied to the first electrode of each group, the portion of each cathode corresponding to that position enters a state in which it can emit electrons. On the other hand, the focusing electrode 4 is divided into 16 parts, and each divided electrode receives a pulse t-4φ 4φ as shown in FIG. 2(B).
. . . Up to 4φ16, a 1×2p 16-phase pulse generator is applied sequentially to each focusing electrode 4. The applied voltage value at this time is about 5 to 1 ov.

4φ is applied to the first electrode of the divided focusing electrodes,
4φ2. ···river.

When 4φ16 is applied and only the first electrode allows the electron beam to pass and has a focusing effect, and the other electrodes are in a state where the electron beam cannot pass, the vertical scanning electrode, the cathode and the focusing The combination of electrodes 40 causes electrons to be emitted from the cathode only from the portion corresponding to the first vertical scan electrode. With this, when displaying a color television image, electrons can be emitted only for a period corresponding to one horizontal scanning line (referred to as IH).

By sequentially generating pulses as shown in FIG. 2 and applying them to each electrode, a television image can be displayed. However, in this case, the luminance signal will be applied to the cathode filament. Above, conventionally,
The 241 electrode terminals for the vertical scanning electrode and the focusing electrode were taken out to the outside of the panel and connected to 241 drive circuits to display images, but in the present invention, the vertical scanning electrode and the focusing electrode are It has become possible to display images with only 31 electrode terminals and the number of drive circuits.

Furthermore, by reducing the number of electrodes taken out from the panel, it is possible to reduce the incidence of defects such as cracks or slow leaks caused by the sealing portion between the electrode and the glass container.

Effects of the Invention The electron beam control means formed in the shape of M short fences are divided into N groups, the respective electrodes between each group are electrically connected, and the electron beam focusing means is divided into iN pieces to be taken out. The number of electrode terminals and the number of drive circuits can be extremely reduced, which has the advantage of being extremely inexpensive and highly reliable. Furthermore, since the electrode means is placed closest to the linear electron source, it can be driven at an extremely low voltage, which also has the advantage of being extremely inexpensive and highly reliable. .

[Brief explanation of the drawing]

FIG. 3 is a perspective view of a conventional flat panel image display device; FIGS. 4A and 4B are horizontal and vertical sectional views of the conventional flat panel image display device; 5A and 5B are a sectional view and a pulse timing chart diagram for explaining vertical scanning of the flat panel image display device, respectively, and FIG. 6 is a signal system diagram for driving the flat panel image display device. 2...Vertical scanning electrode, 3...--Cathode, 4,5°6... Focusing electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2: 4f'/6"L-111" - 111: 3: Figure 4: Figure 5: 2c /2Y/2ZJ: Figure 6: 41 each

Claims (1)

[Claims] In a flat panel image display device comprising a plurality of linear electron sources, an electron beam control means intersecting with the linear electron sources, an electron beam focusing means, and a light emitting means that emits light by collision of the electron beams, the electron beam control means include M number of electron beam control means. The electron beam focusing means is divided into N electrodes, and the M electrodes of the electron beam control means are divided into N groups, and each electrode between each group is electrically connected. A flat panel image display device characterized by: