JPS62154435A - Discharge type display panel - Google Patents

Abstract

PURPOSE:To secure a discharge display panel provided with such an auxiliary discharge mechanism that remarkably reduces the extent of disturbance by black longitudinal streaks, by covering a part of the surface at the display cell observation side with a light shading material, and making a distance between luminescence centers of the display cell equal in the horizontal direction. CONSTITUTION:It is formed into one long cavity form along a sub-anode bus SAB, and auxiliary discharge is produced an and around an intersection point between the sub-anode bus SAB and a cathode bus CB, whereby excited particles are diffused to a display cell CL via a priming slit SL, thus discharge at the display cell CL is made so easy. A phosphor pH sticks to the side of a front face plate FG of the display cell CL, and it emits light with ultraviolet rays produced by the discharge. The front face plate FG side of a part producing a cavity for auxiliary discharge is shaded from light with a black insulator LS of ordinary width d2, performing such a role lowering a reflection factor against external light. The extent of luminous efficiency is not almost reduced as a whole, while since this part is shaded from light, a distance between luminescence centers of the display cell, for example, both distances between cells (CL-CL12) da as well as between cells (CL12-CL13) db can be almost equalized so that fundamental space frequency against disturbance by longitudinal streaks grows two times, thus image disturbance is sharply reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a discharge type image display device, particularly to a discharge type display panel equipped with an auxiliary discharge mechanism.

(Prior Art) FIG. 2 shows a partially enlarged plan view (a) and a sectional view taken along the line x1-X of one example of a conventional discharge type display panel of this type. The basic configuration is the display anode bus group DABI.

[)AB2. DAB3. and cathode bus group CB1
．． Cl32. Togama) IJ sock-like arrangement
11, and display cell CLII at their intersection,
CL12. is located.

At this time, the display anode DAB is placed on the entire glass plate FG, and the cathode CB
is attached to the back plate RG, and the display cells C and IJ are arranged in a sock-like manner to emit light in the space where the double-sided plates face each other.

A discharge type display panel contains a discharge gas in a display cell, and a gas discharge is caused by the pressure between an anode and a cathode, and ultraviolet rays are emitted. The emitted ultraviolet light excites the phosphor ph coated on the inside of the display cell C to emit visible light.

The panel is driven by applying known drive signals to the anode busbar group and the cathode busbar group. At this time, an auxiliary discharge cell SC is provided to facilitate the discharge in each display cell and increase the response speed of the discharge, and this is driven by the auxiliary anode bus groups 5ABI and 5AB2. In order to create a space for the auxiliary discharge cells SC, as shown in FIG. 2, auxiliary anode bus bars 5A81 and the like were provided at a ratio of one row for every two rows of display cells.

(Problems to be Solved by the Invention) When constructing a discharge type display panel equipped with an auxiliary discharge mechanism, as shown in FIG. If no particular care is taken, the distance da between display cells that sandwich the auxiliary anode bus SAB (the distance between the centers of the cell light emitting parts) and the distance db between the display cells that do not sandwich the auxiliary anode bus SAB. As a result, the non-light-emitting portions of the auxiliary discharge became black vertical stripes, interfering with the image and deteriorating the image quality.

(Means for Solving the Problems) An object of the present invention is to provide a discharge display panel equipped with an auxiliary discharge mechanism that significantly reduces the disturbance caused by the above-mentioned black vertical stripes.

That is, the discharge type display panel of the present invention is a discharge type display panel equipped with an auxiliary discharge mechanism, in which a part of the viewing side surface of the display cell (CL) is covered with a light shielding material, and the distance between the light emission centers of the display cells is This feature is characterized in that they are made equal in the horizontal direction.

(Example) FIG. 1 shows a partially enlarged plan view (a) and two sectional views of the first example of the discharge type display panel of the present invention, namely, FIG.
The cross-sectional views taken along lines X, -X2 and lines X, -X in a) are shown.

FIG. 1 shows an example in which the present invention is applied to a two-piece discharge type display panel, which is composed of a group of discharge cells C1 narrowed by a front glass FG and a back glass RG. The same figure (a
) is a view viewed from the full glass plate FG side, and shows the display anode bus lines DABI, DAB2. and cathode bus bar CBI.

CB2. Display cells CLII and CL at the intersection of
It forms 12°.

Auxiliary (or scanning) anode busbars 5ABI and 5AB2° are attached at a ratio of one to two display anode busbars OA8. The display anode busbar and the auxiliary anode busbar are attached to the front plate FG. The back plate RG has a cathode bus line Cal.

CB2. is attached, and in order to create a cell CL space thereon, a patent application filed in 1982 by the present applicant and others was filed earlier.
The white insulating banks WB described in the specification of 144112 are piled up, and a white wall material vIw with good light reflectivity is applied at desired locations to improve the brightness of the display panel. Display cell CL created in this way
The portion of the cathode bus bar CB exposed to the space operates as a cathode.

On the other hand, the auxiliary discharge does not have a cell structure, but has a single long cavity shape along the auxiliary anode bus SAB.
Auxiliary discharge occurs near the intersection of the auxiliary anode bus line SAB and the cathode bus line CB. Since the auxiliary discharge portion does not have a cell structure, particles excited along the auxiliary anode bus line are easily diffused, allowing high-speed scanning.

Particles excited from this auxiliary discharge diffuse into the display cell CL via the priming slit (SL), facilitating the discharge in the display cell C. A phosphor Ph is attached to the front plate FG side of the display cell C, and emits light with ultraviolet rays generated by discharge. Front plate FG of the part that creates the auxiliary discharge cavity
The side is light-shielded by a black insulator LS with a normal width d2, which serves to reduce the reflectance of external light.

In this step, the distance between adjacent display cells, for example, cell CL12
The front plate FG side of the portion corresponding to the upper part of the white bank IVB of the cell CL13 is similarly shielded from light by a black insulator LS with a width d1 close to the width d2 beyond the width of the white bank WB. Pass the anode bus bar DAB of this shielding material through the display anode O to each cell part.
Let A stand out. Furthermore, on the anode base 1DAB,
Deposit high reflectance insulating white wall material VIW. Moreover, the white wall material 14IA is also attached to the portion where the back plate RG is placed.

In this way, the light emitted from the phosphor Ph is emitted directly to the viewing side, but the light emitted to the back plate is absorbed in the conventional example. However, since the reflectance inside the cell CL is quite high,
It was found that the light was reflected there and radiated back to the viewing side of the front panel. An invention using this principle has already been disclosed in an earlier application by the applicants, Japanese Patent Application No. 1982-206979. That is, even if a part of the conventional light-emitting portion is shielded from light, the light-emitting efficiency as a whole hardly decreases. On the other hand, since this part was shielded from light, the distance between the emission centers of display cells, for example, between cells (CLII to CL12) da
and inter-cell (CL12 to CL13) 'db can be made equal to 0, so the fundamental spatial frequency of vertical stripe interference becomes twice that of the conventional one, and image interference is greatly reduced.

FIG. 3 shows a second embodiment of the display panel of the present invention. 1st
In the illustrated display panel, the phosphor ph was attached to the front glass plate FG, but in this configuration, the light emission output is
Since the light emitted into the display cell is absorbed by the phosphor, the light emitted to the viewing side is in the Z position, resulting in poor luminous efficiency. . In the second embodiment shown in FIG. 3, since the fluorescent material ph is attached to the back plate RG, the light emitted there directly passes through the front plate FG and exits to the viewing side, which is efficient. However, as in the first embodiment, since the light shielding LS is attached to the top of the display cell C, its splitting ratio becomes poor. This deterioration can be suppressed as much as possible by effectively using the white bank WB and the white wall material WW. The other structural operations are the same as those of the first embodiment except that the front plate and rear plate are reversed. The positions of the anode and cathode are designed to direct the ultraviolet light output to the phosphor as efficiently as possible. Therefore, the cathode bus C
A cathode C protrudes from B, and a cathode SC for auxiliary discharge
I is also made to protrude so that priming can be easily performed.

Although the first and second embodiments illustrated in FIGS. 1 and 3 have been described with respect to the configuration of a normal DC (direct current) type panel,
Of course, this configuration panel can be operated in pulse memory mode.

Furthermore, by inserting a resistor in series with the anode OA or the cathode C, it can also operate as a memory panel with a resistor. It is also applicable to a type of panel equipped with an auxiliary discharge on the back side, such as the panel described in Japanese Patent Application No. 59-21583, which is an earlier application filed by the present applicant.

Regarding the shape of the display cell CL, there are various modifications other than those shown in FIGS. 1 and 3. Examples of these are shown in FIGS. 4 to 7.

The examples shown in Figures 4 to 7 have an anode OA on the front plate FG side.
, and a cathode C is provided on the back plate RG side. In Fig. 4, a phosphor ph is also attached to the front plate FG side, and the cathode C is exposed at the front in the cell CL, and the remaining part is is covered with white wall material Will. Anode DA is anode bus D
It corresponds to the central part of AB's cell CL.

In the example shown in FIG. 5, the attachment location of the phosphor ph in the example shown in FIG. This is what I did.

In the example shown in FIG. 6, the cathode C is exposed through a square hole, and the front plate F
The area outside the window on the G side is entirely covered with phosphor Ph.

In the example shown in FIG. 7, a protrusion is protruded from the anode bus bar DAB to serve as an anode portion, and the phosphor Ph is attached only to the back plate RG side. At this time, a phosphor P is placed in the window part of the front panel FG.
Light-absorbing inorganic material filter C that transmits the emitted color of h
F is attached to keep the light reflectance toward the viewing side on the front panel of the display panel low.

In the example shown in FIGS. 8 and 9, the cathode C is arranged on the front plate FG side. In the example shown in FIG. 8, the cathode bus bar CB is passed through the center of the cell CL, and the center thereof is used as the cathode C, and the cathode area is not limited. The fluorescent material Ph is attached to the rear plate RG side.

In the example shown in FIG. 9, in addition to the example shown in FIG. 8, an inorganic filter CF is attached, and the cathode area is further limited with a white wall material wt++, thereby stabilizing a small current.

Furthermore, the phosphor ph is attached almost entirely to the inner surface of the cell CL.

In the examples shown in FIGS. 1 and 3, the cathode C and the anode OA are offset, whereas in the examples shown in FIGS. 4 to 9, they are all on-set. The onset type has better discharge stability, but the offset type has better efficiency, and the design should take these aspects into account.

In addition, the cell operation may be negative glow type or positive column type,
The type that looks directly at visible light does not require a phosphor.

It is also applicable to a type in which scanning is performed on the anode side (a type in which the anode is used as a row electrode).

The various configurations of the display panel of the present invention have been described above, and next, the materials of the component parts constituting the display panel of the present invention and their manufacturing method will be described.

(a) Each electrode bus bar: Ni, Ag, Au, Cu-AI,
Cr-Cu-Cr, etc., cathode part: N1 when using Hg, Ba for others
Go to 84. LaB5, anode part: N1 as much as possible when using Hg, Ag, Au, CuA1. Cr-Cu
-Cr.

Both of the above electrodes can also be of the Ni-Ag (N+ on Ag) type.

(a) Bank, white wall material White bank ltsu B1 white wall material 111W is based on the above-mentioned patent application 1983-
See specification No. 144112. Although the object of the present invention can be achieved when a normal black bank is used as the bank, the performance is improved if the inner surface is covered with a fluorescent material or the like.

(C) Light shielding material Glass paste containing Black II.

(d) Discharge gas Usually He-Xe is used, but Ar, N
e.

Kr etc. may be added. N for panels that directly view visible light
e-Ar, Ne-Xe, Ne-Kr, etc. are used. For example, if the distance (d) between the cathode C and the anode OA is 250 pm, the pressure of the filled gas is tle -Xe
(1%) and a pressure (p) of 200 Torr. For the positive column mode, the p (pressure) x d (distance) product may be further increased.

(e) Fluorescent material R (red) :y2o, :Eu, YVO3:εu
, YBO, +Bu.

(Y, Gd) 803: Eu G (green): Zn25+04: Mn, BaMg
2A1140□4:Eu.

Mn, BaAl+20+s: MnB (blue)
:Y2S+05:Ce, BaMg2At, 40.
: Eu.

BaMgAl +4023'Eu or the like is used.

(f) Inorganic material filter: Said patent application 1986-144
See No. 112.

((To) Manufacturing method: Electrodes, banks, white walls, light shielding parts, etc. are formed by bubble printing and fired. Fluorescent materials and inorganic filters can also be formed by the same method, but in the case of fluorescent materials, photosensitive materials are used. In some cases, it may be more effective to mix and adhere the material and photo-etch it.Also, it is also possible to use the photo-adhesive method used in cathode ray tubes.Furthermore, the three colors are printed separately and photo-etched to create a precise pattern. This method is effective because it causes less color mixing.

Other methods such as spraying and dipping can also be used. The electrodes can also be formed by a combination of vapor deposition, spacing, etc. and photoetching.

(Effects of the Invention) As described above, by using the display panel of the present invention, the spatial frequency of the main component of the disturbing vertical stripes, which was conspicuous in the conventional discharge type display panel equipped with an auxiliary discharge mechanism, can be reduced. Since it can be doubled, visual interference can be significantly reduced.

It was also found that the decrease in light output caused by the black insulator provided on the front panel for light shielding can be sufficiently compensated for by improving the internal reflectance of the display cell with white banks and white wall materials.

Furthermore, in an embodiment in which the electrode busbar is almost completely covered, H
Since amalgamation with Ag can be ignored, there is an advantage that inexpensive Ag can be used instead of expensive Au.

[Brief explanation of drawings]

FIG. 1 shows a partially enlarged plan view (a) of a display panel according to the first embodiment of the present invention, and its two sectional views (b) and (C), and FIG. 2 shows a partially enlarged plan view of a conventional example. FIG. 3 is a plan view (a) of a second embodiment of the display panel of the present invention (
a) and two cross-sectional views (b) and (C), and FIGS. 4 to 9 show each plan view (a) and two cross-sectional views of various modifications of the display panel display cell of the present invention. (b) and (C) are shown. DAB... Display anode bus bar CB... Cathode bus bar CL
...Display (discharge) cell FG...Front (glass) plate RG...Back plate SAB...Auxiliary anode bus bar SC...Auxiliary discharge cell We...White (insulator) bank WW.・White wall material ph...fluorescent OA・
...(Display) Anode C...Cathode LS...Black insulator SL...Priming slit CF...Inorganic material filter\ × Figure 2 (a) (b) Figure 4 Figure 5 (a) (a) (b) (b) (C) (C) Yt-Yr fetus 1! ] Y2- Y2 餠l
Figure 6 Figure 7 (a) (a) (b) (b? (C) (C>

Claims (1)

[Claims] 1. In a discharge type display panel equipped with an auxiliary discharge mechanism,
A discharge type display panel characterized in that a part of the viewing side surface of the display cell (CL) is covered with a light shielding material so that the distance between the light emission centers of the display cell is made equal in the horizontal direction.