JP2524516B2 - Flat panel display - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flat panel display device used for a color television receiver, a terminal display of a computer, and the like.

(Prior Art) As a flat cathode ray tube which is the prior art of the present applicant, there is one having a structure shown in FIG. Actually, a vacuum envelope (glass container) is used to form each electrode.
In the figure, the vacuum envelope is omitted to clarify the internal electrodes. Further, in order to clarify the horizontal and vertical directions of the screen for displaying images, characters, etc., the face plate portion is shown in the horizontal direction (H) and the vertical direction (V).

In the figure, reference numeral 10 denotes a vertically long linear cathode in which a surface of a tungsten wire is coated with an oxide cathode material, and a plurality of linear cathodes are independently arranged at equal intervals in the horizontal direction. On the side opposite to the face plate portion 28 with the linear cathode 10 sandwiched therebetween, the linear cathode 10 is adjacent to the linear cathode 10 and is vertically elongated at a regular pitch on the insulating support 11 and is electrically separated. The scanning electrode 12 is arranged.

Next, between the linear cathode 10 and the face plate 28, a planar first grid having openings at portions corresponding to the intersections of the linear cathode 10 and the vertical scanning electrodes 12 from the linear cathode 10 side in order. Electrode (hereinafter abbreviated as G1 electrode) 13, Second grid electrode (hereinafter abbreviated as G2 electrode) 14 having the same opening as G1 electrode 13, Third grid electrode (hereinafter abbreviated as G3 electrode) 15
To place. The G1 and G2 electrodes 13 and 14 are for generating an electron beam from the linear cathode 10, and the G3 electrode 15 is for shielding between the electric field generated by the electrodes in the subsequent stage and the beam generating electric field.

Next, a fourth grid electrode (hereinafter abbreviated as G4 electrode) 16 is arranged, and its opening is longer in the horizontal direction than in the vertical direction.
In the subsequent stage of the G4 electrode 16, two vertical deflection electrodes 17 and 18 having similar openings are arranged. FIG. 4 (A) shows the horizontal cross section of FIG. 3, and FIG. 4 (B) shows the vertical cross section. As shown in the figure, a vertical deflection electrode is formed by vertically shifting the center axes of the apertures of the two electrodes. In the subsequent stage of the vertical deflection electrodes 17 and 18, a plurality of vertically long electrodes are provided between the linear cathodes 10 toward the face plate portion 28. FIG. 3 shows a case of three stages as an example. Each electrode is a first horizontal deflection electrode (hereinafter abbreviated as DH electrode 1) 19, a second horizontal deflection electrode (hereinafter abbreviated as DH electrode 2) 2
0, a third horizontal deflection electrode (hereinafter abbreviated as DH electrode 1) 21,
Each horizontal deflection electrode 19, 20, 21 is connected to the common buses 22, 23, 24 every other horizontal deflection electrode. Each of these horizontal deflection electrodes
19, 20 and 21 have a horizontal focusing function as well as a deflecting function. A light emitting layer including a phosphor screen 26 and a metal back electrode 27 is formed on the inner surface of the face plate portion 28. On the phosphor screen 26, red (R), green (G) and blue (B) phosphor stripes are sequentially formed in the horizontal direction via a black guard band.

Next, the operation of the color cathode ray tube will be briefly described. The linear cathode 10 is heated by flowing the electrode, and the same potential as that of the linear cathode 10 is applied to the vertical scanning electrode 12 and the G1 electrode 13. At this time, if a potential higher than the potential of the linear cathode 10 is applied to the G2 electrode 14 so that the beam passes through the electrode apertures, the linear cathode 10 will move toward the G1, G2 electrodes 13, 14 from the linear cathode 10. An electron beam is emitted. Here, in order to control the beam amount, the linear cathode 10 or
This is done by changing the potential of the G1 electrode 13. G2 electrode 14
The beam that has passed through the aperture is vertically focused by the electrostatic lens formed between the G3 electrode 15, the G4 electrode 16, and the vertical deflection electrodes 17 and 18, and is horizontally focused to DH1, DH2, and DH3, respectively. It is focused by an electrostatic lens formed between.

On the other hand, horizontal deflection is DH1 (19), DH2 (20), DH3 (21)
This is performed by applying a sawtooth wave, a triangular wave, etc., having a horizontal scanning frequency to the common buses 22, 23, 24 connected to.

The vertical scanning is performed as follows (see FIG. 5). The emission of the electron beam from the linear cathode 10 can be controlled by making the spatial potential surrounding the cathode positive or negative with respect to the potential of the linear cathode 10.
That is, the potential of the vertical scanning electrode 12 is emitted by the beam (hereinafter,
It can be controlled by switching to a potential that turns on or abbreviates (hereinafter abbreviated as OFF). In the case of the current television system that adopts the interlace system, the vertical deflection electrodes 17,1 are used in the first field.
A predetermined deflection voltage is applied to 8 for one field period, the beam ON voltage is applied to the vertical scanning electrode 12A only for one horizontal scanning period (hereinafter abbreviated as 1H), and the beam is applied to other vertical scanning electrodes.
Apply OFF voltage. After 1H, only vertical scanning electrode 12B
1H beam ON voltage is sequentially applied to the vertical scanning electrodes
When ON voltage is applied and 12Z at the bottom of the screen ends, the first 1
Vertical scanning of the field is complete. In the next second field, the polarities of the deflection voltages applied to the vertical deflection electrodes 17 and 18 are reversed, and this is applied for one field. The beam ON voltage applied to the vertical scanning electrodes is the same as in the first field. At this time, if 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 located between the horizontal scanning lines of the beam in the vertical scanning of the first field. , Interlacing is possible.

Next, a signal processing method for applying a video signal to the beam modulation electrode of the flat cathode ray tube will be described with reference to FIG. In the figure, 41 is a signal of three primary colors,
A timing pulse generator 43 generates a timing pulse for driving a circuit block, which will be described later, based on the television synchronization signal input from the synchronization signal input terminal 42. Previously demodulated R, G, E _R of the three primary color signals 41 for B, E _C, the E _B, and converted into a digital signal by the A / D converter 44 by a timing pulse, the first line memory signals between 1H Remember in 45. When all the signals for 1H are stored, the signals are transferred to the second line memory 46, and the signals for the next 1H are further stored in the first line memory 45. The signal transferred to the second line memory 46 is stored for 1H, during which the D / A converter 4
The original analog signal is converted at 7 and this signal is amplified and applied to the beam modulation electrode of the cathode ray tube.

Display can be performed with the configuration and operation as described above. Here, the electrode used as a constituent element is made of a thin plate of 42-6 alloy and an electrode obtained by vapor-depositing aluminum on a glass substrate.

(Problems to be Solved by the Invention) In a linear cathode having such a conventional configuration, the linear cathode itself vibrates to contact an electrode in the vicinity thereof, and the electron emission material attached to the linear cathode is peeled off. Another problem is that the electron emission material causes an abnormality in the electron beam trajectory, resulting in uneven light emission on the light emitting means surface. Therefore, the linear cathode formed in a coil shape is used to solve the problem, but there is a problem that uneven light emission occurs on the surface of the light emitting means.

The object of the present invention is to solve the problems of the prior art, to make the electron beam control electrode pitch, the linear cathode support pitch, or the electron beam extraction electrode the same as or an integer multiple of the coil-shaped groove pitch of the linear cathode. By forming the electron beam passage hole pitches of the above, the electron emission distribution is formed in a regular and repeated manner, and the unevenness of light emission due to the irregularity of the pitch of the groove portion and other pitches can be eliminated. Is to provide.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the flat panel display device of the present invention has an electron beam control electrode pitch, a linear cathode support pitch, or an electron beam extraction electrode electron beam. The through hole pitch is formed to be equal to or an integral multiple of the groove pitch of the coil shape of the linear cathode.

(Operation) In the present invention, the electron beam control electrode pitch, the linear cathode support pitch, or the electron beam passage hole of the electron beam extraction electrode is the same as or an integer multiple of the pitch of the coil-shaped groove portion of the linear cathode. By forming the pitch, the electron emission distribution formed by the electron emission from each groove is regularly formed for each pitch. Emission unevenness due to the rules can be eliminated.

Embodiment An embodiment of the present invention will be described with reference to the drawings. The basic configuration of the flat panel display device as one embodiment is almost the same as the basic configuration of the conventional example. That is, as shown in FIG. 3, the vertical scanning electrode 12 and the planar G1 with the linear cathode 10 sandwiched therebetween.
~ G4 electrodes and other planar electrode groups, vertical deflection electrodes 17 and 18 and a group of deflection electrodes such as DH1 to DH3 electrodes, and a fluorescent screen 26 covered with a metal back electrode 27. It is configured to Therefore, the part of the present invention that is largely different from the conventional example will be described in detail. FIG. 1 shows an enlarged perspective view of that portion. 101 is a core wire, and the filament 102 is a tungsten wire with a diameter of 30 μm.
It is formed by winding a tungsten wire having a diameter of 0 μm at a pitch of 250 μm. Therefore, groove portions of about 90 μm are formed for each pitch. (Ba, Ca, Sr) CO ₃ which can be an electron emitting material is attached to the filament 102 by electrodeposition, and a ring having a diameter slightly larger than the filament diameter before the attachment,
Alternatively, by passing the (Ba, Ca, Sr) CO ₃ electrodeposited filament through the cylinder, the linear cathode 106 in which the electron emission material 105 is attached only to the groove 104 formed by the coil-shaped portion 103 is formed. Can be manufactured. On the other hand, electron beam control means 1
The electron beam control electrode 108 forming 07 is an electrode corresponding to the vertical scanning electrode 12 of the conventional example, and Al is vapor-deposited on the glass plate,
Through a photo-etching process, Al electrode widths of 0.3 mm and 0.5 mm pitch are formed in stripes. The linear cathode 106, the electron beam control electrode 108, and the electron beam passage holes of the conventional configuration of the planar electrode group are also implemented by the planar electrode group, the deflecting electrode group, and the light emitting means that are formed at a pitch of 0.5 mm. An example flat panel display is constructed. Further, this operation example is almost the same as the conventional example. 109 is a support, 1
Reference numeral 10 is an electron beam passage hole.

FIG. 2 is an electron emission distribution diagram for specifically explaining the effect of the present invention based on the present embodiment. In the figure,
111 is a virtual anode surface, 112 is an electron emission distribution, and the electron beam emitted from the linear cathode 106 is the coil-shaped portion 103.
It is regularly obtained as a certain electron emission distribution for each pitch of the groove portions 104 formed by. When an arbitrary virtual anode surface 111 is arranged so as to face the linear cathode 106,
It can be seen that the electron emission distribution 112 on that surface is regularly formed at the pitch w ₀ . This pitch w ₀ is the same as the pitch of the groove portions 104. As shown in FIG. 2, the pitch w ₀ is 2
When the electron beam control electrode pitch, the support body pitch, or the electron beam passage hole pitch is formed with a double pitch w ₁ , the electron beam control means is controlled in the valleys of the electron emission distribution 112 as shown in P ₁ column of FIG. Even if a portion without an electrode, a portion of the support, or a portion between electron beam passage holes of an electron beam extraction electrode is arranged, the above three types are present in a portion deviated from the valley of the electron emission distribution 112 as in the row P _2. Even if each part of is arranged, a fixed electron emission distribution (hatched part)
Will be obtained regularly.

(Effects of the Invention) As described above, the pitch of the electron beam control electrode, the support, the electron beam passage hole, or the like is the same as the groove pitch of the coil shape of the linear cathode or is an integer multiple of the groove pitch. The formation of is effective in eliminating uneven light emission on the surface of the light emitting means and providing uniform and extremely high quality display.

[Brief description of drawings]

1 (A), (B), and (C) are perspective views of a main part of one embodiment of the present invention, FIG. 2 is an electron emission distribution diagram for explaining the effect of the present invention, and FIG. 3 is the applicant. FIG. 4 is a perspective view of a flat panel image display device according to the prior art, FIG. 4 is a horizontal and vertical sectional view thereof, FIG. 5 is a vertical scanning explanatory view, and FIG. 6 is a drive circuit system diagram thereof. 101-core wire, 102-filament, 103-coil-shaped portion, 104-groove portion, 105-electron emission material, 106-linear cathode, 107-electron beam control means, 108-electron beam control Electrode, 109 ... Support, 110 ... Electron beam passage hole, 111 ... Virtual anode surface, 112 ... Electron emission distribution.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Junpei Hashiguchi Junpei Hashiguchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kiyoshi Hamada 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Within

Claims (3)

(57) [Claims] 1. A flat panel display device comprising a linear cathode, an electron beam control means for controlling an electron beam emitted from the linear cathode, and a light emitting means for accelerating the controlled electron beam to emit light. The electron beam control means formed by juxtaposing the electron beam control electrodes of
The filament is arranged orthogonal to the linear cathode on the side of the light emitting means or on the back side opposite to the light emitting means, and the linear cathode is a filament formed by forming a core wire and its periphery into a coil shape, and The electron-emitting material is formed by adhering to the coil-shaped groove, and the formation pitch of the plurality of electron beam control electrodes is the same as the coil-shaped groove pitch or an integral multiple of the groove pitch. Flat panel display device. 2. The flat panel display according to claim 1, wherein a pitch for forming the supports for supporting the linear cathodes is the same as the groove pitch of the coil or an integral multiple of the groove pitch. apparatus. 3. A pitch of forming electron beam passage holes in an electron beam extraction electrode for extracting an electron beam from the linear cathode is the same as the groove pitch of the coil shape or an integral multiple of the groove pitch. The flat panel display device according to item (1).