JP2000156166A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize image display of high quality by composing first and second parallel-formed display electrodes of transparent electrodes and metal electrodes formed in electric contact with the transparent electrodes, and arranging the metal electrodes to partially overlap with a light-absorbing band which is disposed between the first and second display electrodes. SOLUTION: Display electrodes 102a, 103 are composed of transparent electrodes 112a, 113 formed with a clearance 124 of a space (g0), and metal electrodes 122a, 123 and form a discharge cell as a pair. A clearance 125 of a space (g) is opened between adjacent display electrodes 102b, 103 and formed on a light-absorbing band 104. The metal electrodes 122a, 123 are respectively formed on the transparent electrodes 112a, 113, so as to be electrically connected as well as to be partially overlap with the light-absorbing band 104. A metal electrode 122b of the display electrode 102b of the adjacent cell of the discharge cell 140 is similarly formed so as to paritally overlap with the light-absorbing band 104, and both are formed with the space (g).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display used for displaying images such as a computer and a television, and more particularly, to enhancing the contrast of a panel and reducing the metal resistance to increase the efficiency, the quality and the length. The present invention relates to a plasma display panel that achieves a longer life.

[0002]

2. Description of the Related Art In recent years, expectations for high-definition and large-screen televisions such as high-definition televisions have been increasing.
CRT, liquid crystal display (hereinafter abbreviated as LCD), plasma display panel (Plasma Display P)
In the field of each display such as anel (hereinafter referred to as PDP), a display suitable for this is being developed.

Conventionally, CRTs, which have been widely used as television displays, are excellent in resolution and image quality, but have a large screen of 40 inches or more in that the depth and weight increase with the screen size. Is not suitable. In addition, LCDs have excellent performance such as low power consumption and low driving voltage, but have technical difficulties in producing a large screen and have a limited viewing angle.

On the other hand, a PDP can realize a large screen even with a small depth, and a 40-inch class product has already been developed.

[0005] PDPs are roughly classified into a direct current type (DC type) and an alternating current type (AC type). At present, the AC type suitable for enlargement is mainly used.

FIG. 6 shows a conventional general AC surface discharge type PD.
It is a schematic sectional drawing of P. In FIG. 6, first and second display electrodes 402a and 403 are provided on an A substrate 401, and a light absorption band 404 made of nickel oxide, ruthenium oxide, or the like is provided therebetween. covered with lead glass dielectric glass layer 405 and the protective film 406 made of MgO consisting _{[PbO-B 2 O 3 -SiO} 2 glass] over.

A cell constituted by the display electrodes 402 a and 403 constitutes one cell in the direction of the address electrode 432. The light absorption band 404 is provided for lowering the contrast (hereinafter referred to as bright place contrast) due to external incident light. The display electrodes 402a and 403 are composed of transparent electrodes 412a and 413 and metal electrodes 422a and 423 provided in contact with the transparent electrodes. The metal electrodes 422a and 423 are provided to reduce the display electrode line resistance. A certain gap is provided between the display electrode 403 and the display electrode 402b (in the same group as the display electrode 402a) of the adjacent cell so that the light absorption band 40 is provided.
4 are provided.

On the B plate 431, the address electrodes 4
32, a dielectric glass layer 433 having the same composition as the dielectric glass layer 405, partition walls 435, and a phosphor layer 434 made of a red, green, or blue ultraviolet-excited phosphor.
Is provided, and a discharge space 426 surrounded by the phosphor layer 434 and the partition 435 contains a mixed discharge gas containing Xe (Ne).
-Xe).

Although FIG. 6 shows a cross section, the display electrodes 402a and 403 and the address electrodes 432 are usually provided orthogonally.

[0010]

In such a PDP, there are problems with efficiency and driving voltage margin as described below.

PD for 40-42 inch class television
In P, the pixel level of NTSC (pixel 640 × 48
0, cell pitch 0.43 mm × 1.29 mm, if the area of 0.55 mm ²⁾ of one cell, the current 150~250c
A screen luminance of about d / m ² is obtained (functional material 19
Vol.16, No.2, February 1996, page 7).

At this time, the width of the metal electrode of the display electrode is 0.1.
mm, the resistance value is about 100Ω. The discharge current of one sustain pulse per cell is about 160 microamps, and 640 × 3 per display electrode line.
Since there are (trio) discharge cells, the current flowing per sustain pulse is about 0.3 amperes.

When the discharge pulse current flows through the metal electrode resistance, the cell voltage drops by about 30V. The decrease in cell voltage due to the discharge current prevents the sustain discharge of the display-addressed undischarged cell, so that there is a phenomenon that a normal screen display is not performed. This appears as a phenomenon that the value at the time of full white becomes larger than the value of the complete display discharge starting voltage at the time of the RGB single color display. For this reason, there is a problem that an operation margin is narrowed. There is also a problem that the discharge luminous efficiency is reduced due to such a decrease in the cell voltage.

This problem is a high definition PD having a small cell size.
In the case of P, the width of the metal electrode cannot be increased due to the relationship of the aperture ratio. In recent years, a 42-inch high-definition television with full specifications has a number of pixels of 1920 × 1125 and a cell pitch of 0.2.
15 mm x 0.48 mm (the area of one cell is 0.072 m
m ² ). In the case of manufacturing with the conventional cell configuration, the width of the bus bar must be about half that of the conventional NTSC, and the metal electrode resistance is about double.

However, the current flowing through the display electrode is NT
SC, the cell voltage drop due to discharge is about twice that of NTSC, and the operating margin is N
The problem of narrower than TSC, the discharge luminous efficiency is NT
There is a problem that it is lower than SC.

In order to reduce the line resistance of the display electrode, it is conceivable to increase the width of the metal electrode or to increase the film thickness. In the former, however, the aperture ratio is reduced and the display luminance is reduced, whereby the efficiency is reduced. There is a limit as it decreases. The latter has a limit because dielectric breakdown occurs due to the thinner dielectric above the metal electrode. There is a need for an improvement in reducing the line resistance of the display electrode without reducing the aperture ratio.

The light absorption band 403 provided for improving the contrast in a bright place is also formed at a constant distance from the display electrode, for example, at a distance of about 40 μm. This is because an electric interaction may occur between the display electrodes 402 and 403 and the light absorption band 403 disposed therebetween, which may adversely affect the display discharge. Seems to be provided. However, if there is unevenness of the gap or a bias such that only one of the gaps approaches the metal electrode side of the display electrode, a moiré pattern or a striped pattern appears on the display screen, and the visual impression of the screen is unfavorable, and it is not satisfactory. Become. In order to eliminate this problem, the light absorption band is generally manufactured by printing. However, dimensional accuracy on the order of microns is required, and there is a problem that the manufacturing cost is increased.

The principle of light emission of a PDP is basically the same as that of a fluorescent lamp. Ultraviolet rays are emitted from a discharge gas upon discharge, and the ultraviolet rays excite and emit red, green and blue phosphors. The efficiency of converting energy into ultraviolet light,
Since the conversion efficiency of the phosphor into visible light is low, it is difficult to obtain a high luminance like a fluorescent lamp.

In this regard, Applied Physics Vol. 51,
No. 3 1982 Pages 344-347
In a PDP having a gas composition of e-Xe or Ne-Xe system,
It is stated that only about 2% of the electrical energy is used for ultraviolet radiation and about 0.2% is finally used for visible light (Optical Technology Contact Vo).
l. 34, no. 1 1996 Page 25, FLA
T PANEL DISPLAY 96 'Part5
-3, NHK Technical Research Vol. 31 No. 1 1979
See page 18).

As described above, it is important to improve the efficiency of the PDP. However, in the PDP having the conventional structure, a decrease in the efficiency due to the display electrode is added, and the improvement is required.

In addition, discharge occurring between adjacent cells in the direction along the partition is generally called inter-cell crosstalk, which is an undesired operation that causes an abnormal screen display in a conventional PDP. Even in NTSC, crosstalk occurs depending on the cell structure design, which is a problem. In particular, in a high-definition PDP, the cell size is reduced, which is a serious problem.

Therefore, the present invention reduces the display electrode resistance by effectively utilizing the light absorption band portion which is less affected by the display brightness and reduces the display electrode resistance.
It is an object of the present invention to provide a plasma display panel that realizes high-quality screen display by improving the efficiency of the device and eliminating the gap between the display electrode and the light absorption band.

[0023]

In order to achieve the above object, a first aspect of the present invention is to provide a first and second display electrodes formed in parallel on an A substrate, and the first and second display electrodes. Light-absorbing band group disposed between the display electrodes, and these are formed by being covered with a dielectric and a protective film formed thereon, on a B substrate disposed opposite to the A substrate. A plurality of barrier ribs orthogonal to the first and second display electrodes;
A phosphor layer corresponding to each pixel is formed between the partition walls, and a data electrode covered with a dielectric is formed below the phosphor layer, and the A substrate and the B substrate are sealed with a sealing material. The first and second display electrodes are sealed and filled with a discharge gas that emits ultraviolet light by discharge, and the first and second display electrodes are composed of a transparent electrode and a metal electrode formed in electrical contact with them. It is characterized in that a part thereof is arranged so as to overlap the light absorption band.

According to a second aspect of the present invention, a plurality of first and second display electrodes formed in parallel on an A substrate are provided.
And a group of light absorption bands arranged between the second display electrodes, which are formed so as to be covered with a dielectric and a protective film formed thereon, and are arranged to face the A substrate. A plurality of partitions are formed on the B substrate orthogonal to the first and second display electrodes, and a phosphor layer corresponding to each pixel is formed between the partitions, and a dielectric layer is formed below the phosphor layer. A data electrode covered with a body is formed, the A substrate and the B substrate are sealed with a sealing material, and a discharge gas which emits ultraviolet light by discharge is filled, and the first and second display electrodes are formed. A transparent electrode and a metal electrode formed in electrical contact with the transparent electrode, the metal electrode being disposed so that a part of the metal electrode overlaps with the light absorption band, and on a portion between the first and second display electrodes. Wherein the protective film is removed.

Further, a third aspect of the present invention is a liquid crystal display device, comprising: a plurality of first and second display electrodes formed in parallel on an A substrate; and a light absorption band disposed between the first and second display electrodes. Groups, which are formed by being covered with a dielectric and a protective film formed thereon, on the B substrate disposed opposite to the A substrate, and on the first and second display electrodes. A plurality of partition walls are orthogonally formed, and a phosphor layer corresponding to each pixel is formed between the partition walls, and a data electrode covered with a dielectric is formed below the phosphor layer. The substrate is sealed with a sealing material, filled with a discharge gas that emits ultraviolet light by discharge, and the first and second display electrodes are formed of a transparent electrode and a metal electrode formed in electrical contact therewith. Comprising, arranged so that a part of the metal electrode overlaps the light absorption band, The protective film on the portion between the first and second display electrodes is made of a material having a secondary electron emission coefficient smaller than the secondary electron emission coefficient of the protective film on the first and second display electrodes. It is characterized by.

In a third embodiment of the present invention, the protective film is made of magnesium oxide, and the protective film is made of a material having a small secondary electron emission coefficient on the portion between the first and second display electrodes. , Preferably covered with a dielectric.

Further, in a preferred embodiment, the dielectric is a dielectric glass containing silicon oxide or silicon dioxide, a dielectric glass containing lead oxide, or a phosphate glass (P ₂ O).
₅ ), dielectric glass containing borate-based glass (B ₂ O ₃ ), dielectric glass containing alumina (Al ₂ O ₃ ), and dielectric glass containing bismuth-based glass (Bi ₂ O ₅ ) It consists of

In another preferred embodiment, the dielectric is made of silicon nitride (Si ₃ N ₄ ).

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Introduction] First, the present invention will be outlined. The light absorption band provided on the A-plate to improve the bright place contrast attenuates a part of the phosphor emission, but greatly attenuates the incident external light. The incident external light is attenuated by the metal electrode and the light absorption band and is incident on the phosphor surface, and the external light diffusely reflected by the phosphor surface is again absorbed by the metal electrode and the light absorption band, and thus is attenuated twice in total. You.
On the other hand, the vacuum ultraviolet light generated by the discharge light emission irradiates the phosphor surface, is converted into RGB visible light by each phosphor, and the visible light passes through the A plate and reaches the viewer. At this time, the visible light is attenuated by the light absorption band and the metal electrode, and the luminance is reduced. The ratio between the incident external reflected light luminance and the emitted visible light luminance gives the value of the light place contrast. Therefore,
In the light absorption band and the metal electrode, it is important how the external incident light is greatly attenuated without lowering the emission luminance due to the discharge.

The present inventors have determined from the measurement results of the discharge light emission intensity distribution by the display electrode composed of a transparent electrode and a metal electrode.
Focusing on the point where the luminous brightness is lower on the side farther than the main (display) discharge gap, and by separating the metal electrode in the direction as far as possible from the main discharge gap, the luminous flux from the phosphor which is shaded by the metal electrode is reduced. It was configured to hold down. This is a design method generally used in the past, but in the present invention,
The configuration is such that the metal electrode is brought closer to the light absorption band and overlapped with the light absorption band. Conventionally, such a configuration is
It seems that it was not used because it might have an adverse effect on discharge, but in experiments conducted by the present inventors,
It was found that there was no problem if the sheet resistance of the light absorption band was sufficiently larger than the sheet resistance of the transparent electrode (100 times or more).

With such a configuration, the width of the metal electrode can be increased, and the resistance of the display electrode can be reduced. As a result, the reduction in cell voltage during discharge was reduced, and the efficiency of the PDP was improved. In addition, it is not necessary to provide a gap between the metal electrode and the light absorption band as in the related art, which is a conventional problem, and a visual defect of the screen such as a moire pattern or a striped pattern appears on the display screen. There was a special effect that was eliminated. In the configuration of the present invention, the contour of the light absorbing portion is defined by the metal electrode.

Therefore, the light absorption band is generally manufactured by printing, but if the width of the light absorption band is designed so as not to protrude from the metal electrode, the required dimensional accuracy is relaxed.
Cost reduction can be realized. Metal electrodes are usually Cr / C
Although u / Cr or photosensitive silver electrodes are used, their shape accuracy is inherently high due to the photo process, and therefore, according to the configuration of the present invention, the visual accuracy as in the prior art is high. The frequency of such troubles is reduced, and furthermore, there is no special factor that causes a new increase in manufacturing cost.

By adopting a structure in which the amount of attenuation of the visible light emitted by the discharge of the cell by the light absorption band and the metal electrode is reduced, it is possible to achieve both high contrast in a bright place and high efficiency. The present invention is an invention made based on such an idea. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 (Overall Structure of PDP) FIGS. 1 and 2 are schematic sectional views of an AC surface discharge type PDP according to an embodiment of the first invention. Note that FIG. 1 shows a cross-sectional view in the direction of the address electrode 132, and FIG. 2 shows a cross-sectional view in the direction of the display electrode 103. Both figures give cross-sectional views orthogonal to each other.

In this PDP, an A glass substrate (front cover plate) 101 and a B glass substrate (back plate) 131 are spaced apart from each other by a partition 135, and are not shown in the figure. Lead glass [P
bO—B ₂ O ₃ —SiO ₂ glass] or crystallization sealing glass. After the panel is evacuated from an exhaust pipe (not shown) at a temperature of about 350 ° C., a discharge gas, for example, a mixed gas of Ne—Xe (5%) is sealed at 200 to 700 Torr, and then the exhaust pipe is sealed. To produce a PDP.

The display electrode group 1 is provided on the A glass substrate 101.
02, 103 and a light absorption band 104 are formed thereon, and a dielectric glass such as lead glass [PbO-B _2] is formed thereon.
O ₃ —SiO ₂ glass];
Protective film 1 made of MgO and electron beam evaporated thereon
06 is formed. The protective film is formed for the purpose of lowering the discharge starting voltage and for preventing the dielectric glass layer from being sputtered by the discharge gas, and is formed of not only MgO but also SrGdO.
Any material may be used as long as it has a high secondary electron emission coefficient (hereinafter referred to as γ coefficient) of ₃ or the like and is hard to be sputtered by electric discharge. It is needless to say that the effects of the present invention can be obtained even if MgO is formed not only by electron beam evaporation but also by other methods such as reactive sputtering and ion beam sputtering.

The display electrodes 102a and 103 are provided with a gap 124.
(Interval g ₀ ) is formed, and a pair of discharge cells 140 is formed. Also, the display electrodes 102b and 103 of the adjacent cells
The gap is formed on the light absorber 104 with a gap 125 (gap).

The display electrodes 102 a and 103 are provided with a gap 124.
(Interval g ₀ ), the transparent electrodes 112a, 1
13 and metal electrodes 122a and 123. The metal electrodes 122a and 123 are respectively
a, 113 are formed so as to be electrically connected to each other, and are formed so as to partially overlap the light absorption band 104 as shown in FIG. The metal electrode 122b of the display electrode 102b of the cell adjacent to the discharge cell 140 is also the metal electrode 1b.
Similarly to 23, a part thereof is formed so as to overlap the light absorption band 104, and both are formed with an interval g.

The metal electrodes 122a, 122b, 123
The A substrate 101 side may be constituted by a light-absorbing electrode, for example, an electrode made of a black electrode material such as ruthenium oxide, and a commercially available photosensitive silver electrode formed thereon. In this case, the portions of the metal electrodes 122a, 122b, 123 that protrude from the light absorption band 104 are black, so that not only the contrast in a bright place but also the visual impression when the screen is not displayed is improved. Alternatively, the metal electrodes 122a and 123 may be electrodes made of a metal material such as aluminum or chromium / copper / chromium (Cr / Cu / Cr). Since these metal electrodes are formed using a photo process, the distortion at the ends is relatively small, which is useful for improving the visibility of the panel. Moreover, because it is a normal metal electrode formation process,
Since there is no additional cost for improving the image quality, it is very advantageous for high quality and low cost.

The light absorption band 104 is formed of a conventional material such as nickel oxide or ruthenium oxide.

On the B substrate 131, an address electrode 132
And a dielectric glass layer 133 and a partition 135 are formed. A phosphor layer 134 is formed on a gutter-shaped inner wall formed by the partition 135 and the dielectric glass layer 133. As shown in FIG. 2, the phosphor layer 134 is separately coated with phosphors of three primary colors of red (R), green (G), and blue (B). Each phosphor layer has vacuum ultraviolet rays (wavelength: 147 nm, 152 nm, and 147 nm) generated by a sustain (display) discharge corresponding to a cell in which data has been written by the address electrode group 132 and the display electrode group 102 thereunder. 173 nm) to generate visible light of each of R, G, and B. The display electrode groups 102 and 103 and the address electrode group 132 are arranged so as to be orthogonal.

The crosstalk between adjacent cells is caused by the gap 125
(Interval g) and the main discharge gap 124 (interval g ₀ ) determine whether or not generation occurs. Crosstalk should not occur if the firing voltage between adjacent cells is higher than the firing voltage between the main discharge electrodes, but in practice this largely depends on the variation in discharge cell characteristics within the panel. and a, generally there is the operating range not occur crosstalk is about 1.2 times the range of the interval g is distance g ₀ (operation margin can be established). In particular, a stable display operation can be performed in a range of about 1.5 times or more.

<Production of PDP> A case of a 42-inch AC-PDP having a cell pitch of 360 μm (× 3) × 1080 μm will be specifically described. In the front cover panel, display electrodes 102 a and 103 are formed on an A-substrate glass 101. First, a transparent electrode (ITO or SnO ₂ ) is formed. This thickness is 200 nm, and the main discharge gap 124 is g ₀ =
The width was set to 80 μm and the width was set to 360 μm. At this time, the interval between adjacent cells is 280 μm.

Next, a commercially available light-absorbing glass paste containing a small amount of nickel oxide or ruthenium oxide was printed in a strip shape so as to be located substantially at the center of the 280 μm gap of the transparent electrodes 102 a and 103, and then printed at 560 ° C. The light absorption band 104 is formed by baking at a degree. The thickness at this time is 10 μm
The sheet resistance of the light absorption band 104 was on the order of MΩ.

Further, a commercially available photosensitive silver paste for a metal electrode is formed by screen printing, followed by exposure, development and baking. The silver paste may be screen-printed to form a pattern and fired. Alternatively, a commercially available photosensitive black electrode material may be printed under the photosensitive silver paste, dried, exposed, developed, and then fired. At this time, the dimensions of the metal electrode are such that the thickness is 5 μm, the interval of the gap 125 is g = 120 μm, and the width is w = 150 to 200 μm.
m. Incidentally, in the conventional structure shown in FIG.
The standard metal electrode width w ₀ is 100 μm.

Thereafter, a lead-based dielectric glass layer 105 (thickness: 40 μm) is formed by screen printing and fired. The composition of the dielectric glass layer 105 of the lead system, lead oxide [PbO] 75 _{wt%, [2 O 3 B]} 15 % by weight boron oxide, silicon oxide [SiO _2] was 10 wt%. On top of this, a protective film 106 is formed to a thickness of 20 by electron beam evaporation.
0 nm was formed.

On the back plate, address electrodes 132 are formed on a B substrate glass 131 by screen printing a photosensitive paste for a silver electrode, exposing and developing, and then firing. A lead-based dielectric glass layer 133 is formed thereon by a screen printing method and firing as in the case of the front cover panel.

Then, the partition wall 135 made of glass is set to 360 μm.
It is fixed at a pitch of m. Then, one of the red phosphor, the green phosphor, and the blue phosphor is disposed in each space between the partition walls 135, so that the phosphor layers 134R and 13R are provided.
4G and 134B are formed. As the phosphor of each color, a phosphor generally used for a PDP can be used. Here, the following phosphor is used. "Red _{phosphor": (Y X Gd 1-X} ) BO 3: Eu 3+ "green phosphor": BaAl ₁₂ O _19: Mn "blue phosphor": BaMgAl ₁₀ O _17: Eu ²⁺ Next, the aforementioned The front cover panel and the back plate manufactured as described above are adhered so that the discharge electrodes and the address electrodes are orthogonal to each other using sealing glass, and the inside of the discharge space 125 partitioned by the partition 135 is evacuated at a temperature of 350 ° C. Exhaust (3 × 10 ^-7 Torr at manifold pressure)
), And then a predetermined composition, for example, NeXe5
% Discharge gas is sealed at a predetermined pressure, for example, 500 Torr to produce a PDP.

<Characteristics of PDP> The discharge voltage of the panel thus manufactured is almost the same as that of the conventional panel, and the light absorption band 104 and the metal electrodes 123 and 122b, which have been of concern in the past, have been concerned.
No effect was seen due to the overlap with. The luminance of the panel was 400 cd / m ² , which was about 20% higher than that of the conventional panel. This is considered to be because the equivalent electrode area became wider than before. Also, since the gap between the display electrodes between adjacent cells was narrower than in the past, there was concern about the occurrence of crosstalk. However, the device actually operated without any problem.
Was experiment variously changing the ratio of the gap g with respect to the main discharge gap g _0, cross-talk in g / g ₀ is about 1.2 or less began to stand out, the problem was not in it more.

The resistance value of the display electrode is reduced from about 70% to about half, so that the variation of the firing voltage due to the lighting rate is greatly reduced.

FIG. 3 shows the dependence of the efficiency on the width of the metal electrode. In FIG. 3, for comparison, the width w0 (= 100 μm) of the metal electrode 423 having the conventional structure is standardized. The efficiency is also normalized by the value at this time. According to the implementation of the present invention, in the structure of FIG. 1, the discharge luminous efficiency was improved by about 15% when W = 150 μm and by about 22% when W = 200 μm. This is because, in the configuration of the present invention, since the width of the metal electrodes 122a and 123 can be made wider than in the related art, the line resistance of the display electrodes 102a and 103 can be reduced, thereby lowering the cell voltage during discharge of the discharge cells. It is considered that the efficiency was reduced and the efficiency was improved.

[Second Embodiment] FIG. 4 is a schematic sectional view of an AC surface discharge type PDP according to a second embodiment of the present invention.
An A glass substrate (front cover plate) 201 and a B glass substrate (back plate) 231 are separated by a partition wall 235 and are not shown, but are not shown in the figure, but a sealing material such as a low melting point lead glass [PbO-B _2] O ₃ —SiO ₂ glass] and crystallization sealing glass.
After the panel is evacuated from an exhaust pipe (not shown) at a temperature of about 350 ° C., a discharge gas, for example, Ne—Xe
(5%) of a mixed gas of 200 to 700 Torr is sealed, and then the exhaust pipe is completely sealed to produce a PDP.

As in the first embodiment, display electrode groups 202 and 203 and a light absorption band 204 are formed on an A glass substrate 201, and a dielectric glass, for example,
A lead glass dielectric glass 205 made of _{[PbO-B 2 O 3 -SiO} 2 glass], M, which is an electron beam evaporation thereon
A protective film 206 made of gO is formed.

The protective film is formed for the purpose of lowering the discharge starting voltage and for preventing the dielectric glass layer from being sputtered by the discharge gas. The protective film is formed of not only MgO but also a high secondary electron emission coefficient (hereinafter γ) such as SrGdO ₃ or the like. Any material may be used as long as it has a coefficient and is hard to be sputtered by electric discharge. It is needless to say that the effects of the present invention can be obtained even if MgO is formed not only by electron beam evaporation but also by other methods such as reactive sputtering and ion beam sputtering.

The display electrodes 202a and 203 are provided with a gap 224.
(Interval g ₀ ) are formed, and a pair of discharge cells 240 is formed. Also, the display electrodes 202b and 203 of the adjacent cells
The gap is formed on the light absorber 204 with a gap 225 (gap) therebetween.

The display electrodes 202a and 203 are provided with a gap 224.
(Interval g0) with transparent electrodes 212a, 2
13 and metal electrodes 222a and 223. Each of the metal electrodes 222a and 223 is a transparent electrode 212.
a, 213 are formed so as to be electrically connected to each other, and as shown in FIG. The metal electrode 222b of the display electrode 202b of the cell adjacent to the discharge cell 240 is also a metal electrode 2b.
Similarly to 23, a part thereof is formed so as to overlap the light absorption band 204, and both are formed with an interval g therebetween.

The difference from the first embodiment is that a part of the protective film 206 is removed and the surface of the dielectric layer 205 is exposed. The protection film removed portion 207 is an upper portion between the metal electrodes 223 and 222b between adjacent cells.
With such a configuration, the protective film removed portion 207 is formed.
However, when the surface of the underlying dielectric layer 205 is exposed and a glass material is used for the dielectric layer, the γ coefficient of this portion is reduced.
Therefore, since the discharge starting voltage between adjacent cells is higher than that in the case where the protective film is provided, an effect that crosstalk hardly occurs is exhibited. Therefore, the metal electrodes 223 and 22
The gap 2b can be narrowed, and its width can be widened.

The gap width of the protection film removed portion 207 is
As for the relative luminous efficiency with respect to the width w of the metal electrode when the interval g is equal to 5, the result similar to that shown in FIG. 3 is obtained as in the case of the first embodiment. Protective film removal part 2
07 is wider than the gap g of the gap 225,
There is an operation mode in which the discharge region generated between the display electrodes 202a and 203 is substantially narrowly limited only by the protective film removed portion 207.

Driving with the operating voltage in such a mode,
Compared to the case of FIG. 3, it becomes possible to suppress the phosphor light emission which is shaded by the metal electrodes 223 and 222b, and the efficiency is further improved. Thus, by implementing the second invention,
At the same time, the line resistance of the display electrode is reduced to increase the efficiency, and at the same time, the discharge in a useless space area that is not very effective for light emission below the metal electrode is suppressed, thereby improving the overall luminous efficiency. .

[Third Embodiment] FIG. 5 is a schematic sectional view of an AC surface discharge type PDP according to a third embodiment of the present invention.
An A glass substrate (front cover plate) 301 and a B glass substrate (back plate) 331 are separated by a partition wall 335 and are not shown, but are not shown in the figure, but a sealing material such as a low melting point lead glass [PbO-B _2] O ₃ —SiO ₂ glass] and crystallization sealing glass.
After the panel is evacuated from an exhaust pipe (not shown) at a temperature of about 350 ° C., a discharge gas, for example, Ne—Xe
(5%) of a mixed gas of 200 to 700 Torr is sealed, and then the exhaust pipe is completely sealed to produce a PDP.

As in the first embodiment, display electrode groups 302 and 303 and a light absorption band 304 are formed on an A glass substrate 301, and a dielectric glass such as a lead glass [ and PbO-B ₂ O ₃ dielectric glass 305 made of -SiO ₂ glass, the protective film 306 formed of an electron-beam deposited MgO is formed thereon.

The protective film is formed for the purpose of lowering the discharge starting voltage and for preventing the dielectric glass layer from being sputtered by the discharge gas. The protective film is made of not only MgO but also a high secondary electron emission coefficient (hereinafter γ) such as SrGdO _3. Any material may be used as long as the material has a coefficient and is hardly sputtered by electric discharge.
It is needless to say that the effects of the present invention can be obtained even if MgO is formed not only by electron beam evaporation but also by other methods such as reactive sputtering and ion beam sputtering.

The display electrodes 302a and 303 are provided with a gap 324.
(Interval g ₀ ) is formed, and a pair of discharge cells 340 is formed. Also, the display electrodes 302b and 303 of the adjacent cells
The gap is formed on the light absorber 304 with a gap 325 (gap) therebetween.

The display electrodes 302a and 303
Transparent electrodes 312a and 31 formed with an interval (g ₀ )
3 and metal electrodes 322a and 323. The metal electrodes 322a, 323 are respectively transparent electrodes 312a,
313 are formed so as to be electrically connected to each other, and
As shown in FIG. 4, a part thereof is formed so as to overlap the light absorption band 304. The metal electrode 322b of the display electrode 302b of the cell adjacent to the discharge cell 340 is also
Similarly to the above, a part thereof is formed so as to overlap with the light absorption band 304, and both are formed with an interval g therebetween.

The difference from the second embodiment is that a part of the protective film 306 is formed of a protective film 307 having a low γ coefficient. The position where the low γ coefficient protective film 307 is formed is an upper portion between the metal electrodes 323 and 322b between adjacent cells. With such a configuration, since the low γ coefficient protective film 307 is present, discharge is less likely to occur in this portion. Therefore, since the discharge starting voltage between adjacent cells is higher than that in the case where the protective film is provided, an effect that crosstalk hardly occurs is exhibited.

Therefore, the gap between the metal electrodes 323 and 322b can be made narrower than in the case of FIG. 1, and the width can be widened. Low γ coefficient protective film 30
When the width of 7 is the same as the gap g of the gap 325, the same luminous efficiency with respect to the width w of the metal electrode as in the second embodiment can obtain substantially the same result as that shown in FIG. . When the width of the low γ coefficient protective film 307 is wider than the gap g of the gap 325, the discharge region generated between the display electrodes 302a and 303 is substantially narrowed by the low γ coefficient protective film 307. Exists. Driving with the operation voltage in such a mode makes it possible to suppress the emission of fluorescent material, which is shaded by the metal electrodes 323 and 322b, as compared with the case of FIG. 3, thereby further improving the efficiency.

When the material of the low γ coefficient protective film 307 is made of a material having a lower γ coefficient than the protective film 306 and hard to be sputtered by the discharge gas, the dielectric layer The effect of protection from spatter 305 is exhibited, and the life can be extended. The low γ coefficient protective film 307 is formed by covering the protective film 306 with a dielectric material. In a preferred embodiment, the dielectric is silicon oxide, a dielectric glass containing silicon dioxide,
Alternatively, dielectric glass containing lead oxide, phosphate glass (P
Dielectric glass containing ₂ O ₅ ), dielectric glass containing boric acid glass (B ₂ O ₃ ), dielectric glass containing alumina (Al ₂ O ₃ ), and dielectric glass containing bismuth glass (Bi ₂ O ₅ ) It consists of body glass. These dielectrics are formed by patterning a paste by a known technique such as a screen printing method and then baking the paste.

Also, as another preferred embodiment, low γ
The coefficient protection film 307 is to form a dielectric made of silicon nitride (Si ₃ N ₄ ). It can be formed by a reactive sputtering method or the like, and can be formed by etching or a lift-off method. In the case of this film, since it is a hard film, it has a high sputter resistance and exhibits excellent characteristics in terms of the protective film function.

As described above, according to the third embodiment of the present invention, the line resistance of the display electrode is reduced to increase the efficiency, and at the same time, the discharge of a useless space area that is not very effective for light emission below the metal electrode is performed. Deteriorating, improving the overall luminous efficiency,
In addition, it has excellent sputter resistance and can extend the life.

[0070]

As described above, the plasma display panel of the first invention has a display electrode composed of a transparent electrode and a metal electrode formed in electrical contact with the transparent electrode, a light absorption band, A state in which a front cover plate on which a dielectric glass layer on which a protective film is formed is disposed, and a back plate on which a data electrode and a phosphor layer are disposed, with the dielectric glass layer and the phosphor layer facing each other. Arranged in
A discharge space partitioned by a partition is formed between the front cover plate and the back plate, and the metal electrode is disposed so as to overlap the light absorption band.

As a result, it is possible to improve the contrast in a bright place and the image quality at a low cost. Also, it is possible to increase the width of the metal electrode,
Thereby, the line resistance of the display electrode can be reduced,
A special effect of realizing high efficiency of the discharge cell is exhibited.

A plasma display panel according to a second aspect of the present invention is the plasma display panel according to the first aspect, in which a protective film is removed from a portion between metal electrodes formed so as to overlap a part of the light absorption band. It is characterized by the following.

Thus, in addition to the above-described effects, a special effect is obtained in that discharge in a useless space area that is not very effective for light emission below the metal electrode is suppressed, and the luminous efficiency of the entire cell can be further improved. I do.

The plasma display panel according to a third aspect of the present invention is the plasma display panel according to the first aspect, wherein the protective film between the metal electrodes formed so as to overlap with a part of the light absorption band protects the display electrode. It is characterized by being made of a material having a secondary electron emission coefficient smaller than the secondary electron emission coefficient of the film.

As a result, in addition to the above-mentioned effect exerted by the first embodiment of the present invention, the discharge in a useless space area that is not very effective for light emission below the metal electrode is suppressed, and the luminous efficiency of the entire cell is improved. It is possible to achieve a further improvement, and also exhibits a special effect that is excellent in spatter resistance and can extend the life.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a plasma display panel (in the direction of an address electrode) according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view showing a configuration of a plasma display panel (display electrode direction) according to the first embodiment of the present invention.

FIG. 3 is a diagram showing relative efficiency characteristics with respect to a relative metal electrode width according to the first embodiment of the present invention;

FIG. 4 is a configuration sectional view of a plasma display panel according to a second embodiment of the present invention;

FIG. 5 is a configuration sectional view of a plasma display panel according to a third embodiment of the present invention;

FIG. 6 is a cross-sectional view of a configuration of a conventional plasma display panel.

[Explanation of symbols]

 101, 131 substrate 102a, 102b, 103 display electrode 104 light absorption band 106 protective film 122a, 122b, 123 metal electrode 201, 231 substrate 202a, 202b, 203 display electrode 204 light absorption band 206 protective film 207 protective film removing portion 222a, 222b, 223 Metal electrode 301, 331 Substrate 302a, 302b, 303 Display electrode 304 Light absorption band 306 Protective film 307 Low γ coefficient protective film 322a, 322b, 323 Metal electrode

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kinzo Nonomura 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Naoki Kosugi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. KB19 MA02 MA12 5C058 AA11 AB01 BA05 BA08 BA35

Claims (11)

[Claims] 1. A plurality of first parallel formed on an A substrate.
Display electrodes and a second display electrode, and a group of light absorption bands disposed between the first display electrode and the second display electrode, which are composed of a dielectric and a protective film formed thereon. A plurality of partitions orthogonal to the first display electrodes and the second display electrodes, and a plurality of pixels interposed between the partitions on a B substrate formed and covered by the A substrate and opposed to the A substrate. Is formed, and a data electrode covered with a dielectric is formed under the phosphor layer, the A substrate and the B substrate are sealed with a sealing material, and A plasma display panel filled with a discharge gas that emits ultraviolet light, wherein the first display electrode and the second display electrode include a transparent electrode and a metal electrode formed in electrical contact therewith, Arranged so that part of the metal electrode overlaps the light absorption band A plasma display panel characterized by being performed. 2. A plurality of first parallel substrates formed on an A substrate.
Display electrodes and a second display electrode, and a group of light absorption bands disposed between the first display electrode and the second display electrode, which are composed of a dielectric and a protective film formed thereon. A plurality of partitions orthogonal to the first and second display electrodes, and a plurality of partitions corresponding to each pixel between the partitions, on a B substrate formed and covered by the A substrate and disposed to face the A substrate. A phosphor layer is formed, and a data electrode covered with a dielectric is formed below the phosphor layer. The A substrate and the B substrate are sealed with a sealing material, and ultraviolet rays are emitted by discharge. Wherein the first display electrode and the second display electrode comprise a transparent electrode and a metal electrode formed in electrical contact with the transparent electrode, and the metal electrode Is disposed so as to overlap the light absorption band, A plasma display panel having a structure in which the protective film on a portion between a first display electrode and a second display electrode is removed. 3. A plurality of first parallel substrates formed on an A substrate.
Display electrodes and a second display electrode, and a group of light absorption bands disposed between the first display electrode and the second display electrode, which are composed of a dielectric and a protective film formed thereon. A plurality of partitions orthogonal to the first display electrodes and the second display electrodes, and a plurality of pixels interposed between the partitions on a B substrate formed and covered by the A substrate and opposed to the A substrate. Is formed, and a data electrode covered with a dielectric is formed under the phosphor layer, the A substrate and the B substrate are sealed with a sealing material, and A plasma display panel filled with a discharge gas that emits ultraviolet light, wherein the first display electrode and the second display electrode include a transparent electrode and a metal electrode formed in electrical contact therewith, Arranged so that part of the metal electrode overlaps the light absorption band Wherein the protective film on the portion between the first display electrode and the second display electrode has a secondary electron emission coefficient smaller than the secondary electron emission coefficient of the protective film on the first and second display electrodes. A plasma display panel comprising a material having: 4. The method according to claim 1, wherein the protective film is made of magnesium oxide.
4. The plasma display panel according to claim 3, wherein a protective film made of a material having a small secondary electron emission coefficient on a portion between the display electrode and the second display electrode is covered with a dielectric. 5. The dielectric according to claim 3, wherein the dielectric is made of a dielectric glass containing silicon oxide and silicon dioxide.
The plasma display panel as described in the above. 6. The plasma display panel according to claim 3, wherein the dielectric is made of a dielectric glass containing lead oxide. 7. The plasma display panel according to claim 3, wherein the dielectric is made of a dielectric glass containing phosphoric acid glass (P ₂ O ₅ ). 8. The dielectric glass is a borate glass (B ₂ O ₃ ).
4. A dielectric glass comprising:
Or the plasma display panel according to 4. 9. The method according to claim ₃ , wherein the dielectric is made of a dielectric glass containing alumina (Al ₂ O ₃ ).
The plasma display panel as described in the above. 10. The dielectric material is bismuth-based glass (Bi ₂ O ₅ ).
4. A dielectric glass comprising:
Or the plasma display panel according to 4. 11. The plasma display panel according to claim ₃ , wherein the dielectric is made of silicon nitride (Si ₃ N ₄ ).