JP2000011889A - Gas discharge type display panel - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To obtain a high-brightness gas discharge type display panel. SOLUTION: In a discharge type display panel comprising an electrode pair formed of two discharge electrodes parallel to each other on the same substrate, wherein the discharge electrodes comprise a transparent electrode and a bus electrode made of a metal material. The edge of one side of the transparent electrode is configured to be located within the width of the bus electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface discharge type gas discharge type display panel such as an AC type plasma display panel, and more particularly, to a gas discharge type display panel which can improve the brightness as compared with the prior art. is there.

[0002]

2. Description of the Related Art Gas discharge display panels such as plasma display panels perform display by self-emission,
The viewing angle is wide and the display is easy to see. In addition, it has a feature that it can be a thin display device and can realize a large screen, and is expected to be applied to a display device of an information terminal device and a high-definition television.

The above-described plasma display panels are roughly classified into a direct current drive type (DC type) and an alternating current drive type (AC type). Among them, the AC type plasma display panel has a memory function by the action of the dielectric layer covering the electrodes used for the discharge, and has a practically usable life due to the formation of the protective layer and the like. As a result, AC
2. Description of the Related Art In recent years, a plasma display panel has been put to practical use as a thin, versatile monitor with a large screen.

FIG. 6 shows an example of a conventional AC plasma display panel. FIG. 6A is a partial plan view as viewed from the display surface side, and FIG. 6B is a partial cross-sectional view.

[0005] The front substrate 13 is formed on the front glass substrate 1 so that the scanning electrodes 3 and the sustaining electrodes 4 are parallel to each other.
A surface discharge electrode pair 103 serving as one cell is formed. The scan electrode 3 and the sustain electrode 4 are made of Ag, Cu or A, respectively.
bus electrodes 19, 19 'made of a metal material such as
The transparent electrodes 12 and 12 'are made of O (Indium Tin Oxide) or tin oxide (SnO ₂ ). Further, a front dielectric layer 5 covering the scan electrodes (bus electrodes and transparent electrodes) 3 and the sustain electrodes (bus electrodes and transparent electrodes) 4
And a protective layer 6 made of magnesium oxide (MgO) or the like. Also, the rear substrate 14
On the back glass substrate 2, a writing electrode 9 made of a metal material such as Ag, Cu, or Al, a back dielectric layer 8, a partition wall 7, and a phosphor layer 10 for converting ultraviolet generated by discharge into visible light. Are formed.

Then, the front substrate 1 and the rear substrate 2 are bonded together so that the sustain electrodes 4 and the write electrodes 9 are perpendicular to each other, and Ne, Xe, Ar or the like is filled as a discharge gas, and the outer peripheral portion is sealed with a sealing layer 11. By sealing the discharge space 1
5. A gas space 16 is formed. The discharge space 15
And a space different from the gas space 16 are defined, but the spaces are mostly connected at predetermined positions in the panel, and are spaces where the same gas exists at the same pressure.

In this AC type plasma display panel, a specific pulse driving waveform voltage is applied between the scanning electrode 3, the sustaining electrode 4, and the writing electrode 9, whereby
A main discharge is performed between the scan electrode 3 and the sustain electrode 4 in the specific discharge space 15 to control a non-light emitting discharge space and a light emitting discharge space, thereby enabling an arbitrary image display.

A conventional example of the gas discharge type display panel shown here is, for example, a flat panel display 1996.
(Nikkei Microdevices, 1995), pp. 208-215.

[0009]

In a conventional plasma display panel, as shown in FIG. 2B, the bus electrode 19 (19 ') has a transparent electrode width 201.
By arranging them so as to be included inside (201 ′), the outer shapes of the sustain electrodes and the scan electrodes can be changed to the transparent electrodes 12 (1
2 '). That is, an adjacent gap 204 that is a gap distance between adjacent surface discharge electrode pairs, and a discharge gap 2 that is a gap distance between a sustain electrode and a scan electrode.
02 was defined by the outer shape of the transparent electrode 12 (12 ′). Here, for stable discharge, the adjacent gap 204 and the discharge gap 202 must be accurately formed. For this reason, in consideration of the alignment accuracy between the bus electrode 19 (19 ') and the transparent electrode 12 (12'), the bus electrode 19 (19 ') is positioned closer to the gap 204 side than the edge of the transparent electrode 12 (12'). The bus electrode 19 (19 ') and the transparent electrode 12 are formed on the inner side of about 0.03 to 0.05 mm.
Even if a displacement occurs during the manufacturing process of (12 ′), the bus electrode 19 (19 ′) is not covered with the transparent electrode width 201 (20).
1 ')).

However, there is a problem that the luminance of the gas discharge type display panel is reduced by disposing the bus electrode inside the width of the transparent electrode as described above. This is because the bus electrode that blocks light emission is disposed closer to the center of the surface discharge electrode pair where the light emission intensity due to discharge is strong.

[0011] The present invention has been made in view of the above points,
It is an object of the present invention to provide a gas discharge type display panel having higher brightness than before.

[0012]

To achieve the above object, a gas discharge type display panel according to the present invention comprises:
As shown in FIG. 2A, the edge 401 of the transparent electrode 12 (12 ′) is configured to be arranged in the bus electrode 19 (19 ′). Thus, the transparent electrode 12 (1
The edge 401 of 2 ′) is connected to the bus electrode width 205 (205 ′).
2B, a bus electrode that blocks light emission even in a gas discharge type display panel having the same discharge gap 202 and adjacent gap 204 as the conventional gas discharge type display panel shown in FIG. 19 (19 ') can be arranged at the outer end of the pair of surface discharge electrodes, and as a result, the light emission near the center of the pair of surface discharge electrodes 103 having high emission intensity is
It can be used more effectively, and the brightness of the gas discharge display panel can be improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a main part configuration of an AC type plasma display panel according to an embodiment of the present invention. FIG. 1A is a partial front view viewed from a screen display surface side, and FIG. ) Respectively show partial cross sections corresponding to FIG.

In FIG. 1, 13 is a front substrate, 14 is a rear substrate, 15 is a discharge space, 1 is a front glass substrate, 2 is a rear glass substrate, 12 and 12 'are transparent electrodes made of a transparent conductive material, 19 and 19 'Is a bus electrode provided so as to overlap a part of the transparent electrode, 5 and 8 are dielectric layers, 6 is a protective layer made of MgO, 9 is a writing electrode, 10 is a phosphor, and 7 is a discharge space. It is a partition. The basic configuration is shown in FIG.
The scanning electrode 3 is formed by the transparent electrode 12 and the bus electrode 19, and the sustain electrode 4 is formed by the transparent electrode 12 'and the bus electrode 19'.

As shown in FIG. 1, in this embodiment, one edge 401 of the transparent electrode 12 (12 ') is arranged within the bus electrode width 205 (205'). More specifically, the surface discharge electrode pair 10 in the transparent electrode 12 (12 ′)
3 is located outside the bus electrode width 2.
05 (205 '). That is, the gap between the two discharge electrodes (the interval between the scan electrode 3 and the sustain electrode 4; discharge gap) 2
02 is defined by the outline of the transparent electrodes 12, 12 ', and the gap 204 (adjacent gap) between adjacent surface discharge electrode pairs is defined by the outline of the bus electrodes 19, 19'. It has become so.

By arranging the edge 401 of the transparent electrode 12 (12 ') inside the bus electrode width 205 (205'), the plasma display panel has the same discharge gap and the same adjacent gap. Even
The bus electrode that blocks light emission can be arranged at the outer end of the surface discharge electrode pair, and as a result, the light emission near the center of the surface discharge electrode pair with high emission intensity can be more effectively used, and the plasma display It is possible to improve the brightness of the panel (gas discharge type display panel).

FIGS. 2A and 2B show the present embodiment and a conventional plasma display panel in comparison. FIG. 2A shows the configuration of the present embodiment, and FIG. 2B shows the conventional configuration. And have the same discharge gap and the same adjacent gap. FIG. 3A is a view showing A in the plasma display panel of the present embodiment shown in FIG.
FIG. 3B schematically illustrates a luminance distribution on the −A ′ line segment.
2 schematically shows the luminance distribution on the line BB ′ in the conventional plasma display panel shown in FIG.

As shown in FIG. 3, almost no luminance is obtained in the bus electrode region 302 because the bus electrode is opaque. Therefore, the brightness of the plasma display panel is represented by an integrated value of the brightness excluding the bus area 302. When comparing FIG. 3A and FIG. 3B, in the plasma display panel having the same surface discharge electrode outer shape 301, the luminance integrated value according to the present embodiment in FIG. It can be seen that it is larger than the luminance integrated value of the conventional structure shown in FIG.

By arranging the edge 401 of the transparent electrode 12 (12 ') within the bus electrode width 205 (205'), as described above, the discharge gap 202 is formed.
Is formed by the outer shape of the transparent electrode 12 (12 '), and the adjacent gap 204 is formed by the outer shape of the bus electrode 19 (19'). The bus electrode is often formed by a photolithography process as in the case of the transparent electrode, and the external electrode forming accuracy of the transparent electrode and the bus electrode is almost the same, and the forming accuracy of the adjacent gap 204 is the same as that of the conventional transparent electrode. Since this is almost equal to the case where the discharge is performed, the stability of the discharge is not impaired.

Further, by designing the edge of the transparent electrode so as to be located substantially at the center of the width of the bus electrode as in the present embodiment, even if a displacement occurs between the transparent electrode and the bus electrode, the transparent electrode can be formed. Does not come off the bus electrode. Usually, the bus electrode width is 0.06 to 0.1.
mm, and the misalignment between the transparent electrode and the bus electrode is 0.005 to 0.02 m in a general manufacturing process.
This is because it can be suppressed to about m, which is less than half the width of the bus electrode.

Next, an example of the manufacturing method of the present embodiment will be described. First, a method for manufacturing the front substrate 13 will be described.

(1) A glass plate such as soda lime glass as the front glass substrate 1 is washed with a neutral detergent or the like.

( ₂ ) The thickness of silicon dioxide (SiO ₂ ) is set to 0.00002 to 0.02 on the cleaned front glass substrate 1 by a film forming technique such as a sputtering method or a dipping method.
002 mm (not shown). next,
A transparent conductive film such as a tin oxide film or an ITO film is formed to a thickness of 0.0001 to 0.0005 mm by a film forming technique such as a sputtering method or an electron beam evaporation method. Next, the transparent conductive film is processed by a known photoetching method to form the transparent electrodes 12 and 12 ′.
The pattern dimensions of the transparent electrodes 12, 12 'may be determined according to the pixel size of the panel to be manufactured.

(3) A chromium (Cr) film is used to form a copper (Cu) film on the front glass substrate 1 on which the transparent electrodes 12 and 12 'are formed, using a film forming technique such as a sputtering method or an electron beam evaporation method.
A Cr / Cu / Cr laminated film in which the films are sandwiched is formed. Front glass substrate 1 on which transparent electrodes 12 and 12 'are formed
The thickness of the chromium (Cr) film in contact with is 0.0003 to 0.
001 mm, and the thickness of the copper (Cu) film thereon is 0.001
The thickness of the chromium (Cr) film was set to 0.0005 to 0.0015 mm. Then, using a known photo etching method,
By processing the Cr / Cu / Cr laminated film, the transparent electrode 12,
An electrode pattern is formed so as to overlap with a part of 12 ′, and bus electrodes 19 and 19 ′ are formed. Cu film thickness and bus electrode 1
The pattern dimensions 9 and 19 'may be determined according to the resistance value required for the bus electrodes 19 and 19'.

(4) A predetermined portion of the front glass substrate 1 on which the transparent electrode 12 (12 ') and the bus electrode 19 (19') are formed, is screened using a paste mainly composed of lead oxide. After the solid printing by the printing method, the resultant is baked with a predetermined profile to form the front dielectric layer 5 having a thickness of 0.02 to 0.05 mm. If these film thicknesses cannot be obtained by one printing, printing and baking may be repeated a plurality of times. At this time, for example, a material that protects the electrode material is used as the dielectric material in contact with the electrode, and a surface on which the MgO film that is the next protective layer 6 is easily formed is obtained as the dielectric material formed thereon. As with materials, the paste may be changed to suit the purpose.

(5) An MgO film is formed at a predetermined place by using a film forming method such as a sputtering method or an electron beam evaporation method,
The protective layer 6 is used. The thickness of the MgO film needs to be determined according to the life required for the gas discharge type display panel, and a typical value is 0.0003 to 0.001 mm.

Through the above steps, the front substrate 13 is completed.

Next, a method of manufacturing the back substrate 14 will be described.

(6) A glass plate such as soda lime glass as the rear glass substrate 2 is washed using a neutral detergent or the like.

(7) The film thickness of silicon dioxide (SiO ₂ ) is 0.00002 to 0.00.0 on the cleaned rear glass substrate 2 by a film forming technique such as a sputtering method or a dipping method.
An insulating layer is formed to have a thickness of 002 mm (not shown). Next, a Cr / Cu / Cr laminated film in which a copper (Cu) film is sandwiched by a chromium (Cr) film is formed by using a film forming technique such as a sputtering method or an electron beam evaporation method. Chromium (Cr) in contact with rear glass substrate 2 on which insulating layer is formed
The thickness of the film is 0.0003 to 0.001 mm, the thickness of the copper (Cu) film thereon is 0.001 to 0.003 mm, and the thickness of the chromium (Cr) film thereon is 0.0005 to 0.005 mm.
It was formed to have a thickness of 0.0015 mm. Next, the Cr / Cu / Cr laminated film is processed by using a known photo-etching method to form a write electrode 9. The thickness of the Cu film and the pattern size of the writing electrode 9 may be determined according to the resistance value required for the writing electrode 9.

(8) After a solid printing is performed on a predetermined place of the rear glass substrate 2 on which the writing electrode 9 is formed by a screen printing method using a paste containing lead oxide as a main component,
It is baked with a predetermined profile and has a film thickness of 0.005 to 0.5 mm.
A back dielectric layer 8 of 04 mm is formed. At this time, for example, printing and baking are performed twice to obtain the back dielectric layer 8 having a predetermined shape. At this time, for example, a material for protecting the electrode material is used as the dielectric material in contact with the write electrode 9, and the reactivity with the material of the partition 7 to be formed next is taken into consideration for the dielectric material formed thereon. It is preferable to change the paste to suit the purpose so that the material is used. Further, in order to effectively reflect even a little light emitted to the rear glass substrate 2 when the phosphor emits color, the rear dielectric layer 8 is preferably made of a white insulating material.

(9) Solid printing is performed on a predetermined location of the rear glass substrate 2 on which the rear dielectric layer 8 is formed, by a screen printing method using a partition paste containing lead oxide as a main component, and a film thickness is obtained. Applies a partition material of 0.1 to 0.2 mm. 1
If these film thicknesses cannot be obtained in one printing, printing and baking may be repeated a plurality of times. At this time, for example,
Only the uppermost layer of the partition 7 may be made of a black material, and the other may be made of a white material. As described above, the paste may be changed to a paste that suits the purpose. The partition paste may be formed once by a blade coating method or a roll coating method.

(10) A photosensitive film is laminated on the rear glass substrate 2 on which the partition wall material has been formed, and is exposed, developed, washed and dried to form a predetermined photosensitive film pattern.

(11) By performing a sandblasting process, a portion of the rear wall glass substrate 2 which is not covered with the photosensitive film is removed to form a “groove” serving as the discharge space 15. After peeling off the photosensitive film, it is baked with a predetermined profile to form the partition 7.

(12) The green, blue, and red phosphors 10 are applied to the surface of the inner wall of the "groove" to be the discharge space 15 by using a method such as a spray method or a screen printing method. Then 1
A heat treatment is performed at a temperature of 50 to 500 ° C. for 5 to 60 minutes.

(13) A pattern of a sealing material is formed by using a dispenser method, and drying and binder removal are performed to form a sealing layer 11 for performing vacuum sealing.

In the above steps, the partition 7 for separating the discharge space
And the back substrate 14 having the phosphor 10 is completed.

Next, a method of assembling the front substrate 13 and the rear substrate 14 will be described.

(14) The front substrate 13 and the rear substrate 14 are aligned and temporarily fixed with a high heat-resistant clip or the like. At this time, the pair of surface discharge electrodes 103 provided on the front substrate 13 and the write electrodes 9 provided on the rear substrate 14 are made orthogonal to each other.

(15) A chip tube (not shown) is attached to the rear substrate 2 for exhaust and gas introduction after panel assembly.

(16) The front substrate 13 and the rear substrate 14 that have been aligned are subjected to a heat treatment to fix these substrates.

(17) The gas space 16 and the discharge space 15 formed between the front substrate 13 and the rear substrate 14 are evacuated through a chip tube (not shown) provided on the rear substrate 14. Ne gas containing 10% of Xe gas is introduced into the gas space 16 and the discharge space 15 and the pressure is reduced to 3%.
Adjust to 5-70 kPa.

(18) The plasma display panel (gas discharge type display panel) is completed by performing chip-off by local heating of a chip tube (not shown).

In the present embodiment, a photomask of a transparent electrode used in the above-described manufacturing process (2) of the front substrate 13 is provided.
The photomask of the bus electrode used in the above-described manufacturing step (3) can be realized by pattern design such that the edge of the transparent electrode falls within the width of the bus electrode.

In this embodiment, the transparent electrode has been described as having a strip shape. However, as shown in FIG. 4, the transparent electrodes 12 and 12 'have irregularities on the discharge gap side, and FIG. As shown, the transparent electrodes 12, 12 'may have a plurality of island-like separated shapes. Further, the shape of the unevenness or the island may be an arc, a square, a triangle, or the like.

In this embodiment, the bus electrode is described as having a strip shape. However, even when the bus electrode is formed in a concavo-convex shape in consideration of a panel driving method and capacitance, an adjacent gap is formed at the edge of the bus electrode. It does not matter.

Further, in this embodiment, the bus electrode 1
Cu and Cr are used as the materials of 9 and 19 '.
It is possible to use metals such as l, Ti, Ni, W, and Mo, and alloys thereof. In addition, a sputtering method or an electron beam evaporation method is used as a method for forming the materials constituting the bus electrodes 19 and 19 'and the writing electrode 9, but the formation method is not limited, and a plating method, a resistance heating evaporation method, a thick film A printing method or the like may be used. Further, the transparent conductive material forming the transparent electrodes 12 and 12 ′ is not limited to tin oxide or ITO, and the method for forming the transparent conductive material is not limited to sputtering or electron beam evaporation. A phase reaction method or a sol-gel method may be used.

As described above, by arranging the edge of the transparent electrode within the width of the bus electrode, light can be emitted even from a plasma display panel (gas discharge type display panel) having the same discharge gap and adjacent gap. The bus electrode for shielding light can be arranged at the outer end of the pair of surface discharge electrodes, and as a result, the light emission near the center of the pair of surface discharge electrodes having high light emission intensity can be more effectively used. hand,
Plasma display panel (gas discharge type display panel)
Can be improved. Also, the present invention
Since it can be dealt with only by changing the design of the mask having the conventional electrode structure, the brightness of the plasma display panel (gas discharge type display panel) can be improved without increasing the manufacturing cost.

[0049]

As described above, according to the present invention, it is possible to realize a gas discharge type display panel whose luminance can be improved as compared with the conventional one without increasing the manufacturing cost, and its industrial value is enormous.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a main configuration of an AC plasma display panel according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for comparing a main configuration of an AC plasma display panel according to an embodiment of the present invention with a main configuration of an AC plasma display panel according to a conventional technique.

FIG. 3 is an explanatory diagram showing a luminance distribution by the configuration of FIG. 2A and a luminance distribution by the configuration of FIG. 2B in comparison;

FIG. 4 is an explanatory diagram showing a main configuration of an AC plasma display panel according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a main configuration of an AC plasma display panel according to still another embodiment of the present invention.

FIG. 6 is an explanatory view showing a configuration of a main part of an AC type plasma display panel according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front glass substrate 2 Back glass substrate 3 Scan electrode 4 Sustain electrode 5 Front dielectric 6 Protective layer 7 Partition 8 Back dielectric 9 Writing electrode 10 Phosphor layer 11 Sealing layer 12, 12 'Transparent electrode 13 Front substrate 14 Rear substrate 15 Discharge space 16 Gas space 19, 19 'Bus electrode 103 Surface discharge electrode pair

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Ryohei Sato Inventor Hitachi, Ltd. Information Media Business Headquarters, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Masashi Nishigame Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa No. 292 F-term in Hitachi, Ltd. Production Engineering Laboratory Co., Ltd. (reference) 5C040 DD01

Claims (4)

[Claims] An electrode pair formed of two discharge electrodes parallel to each other on the same substrate, wherein the discharge electrode comprises a transparent electrode and a bus electrode made of a metal material, and one side of the transparent electrode. A gas discharge display panel, wherein the edge of the gas discharge type display panel is arranged within the bus electrode width. 2. The gas discharge type display panel according to claim 1, wherein one edge of the transparent electrode is arranged substantially at the center of the width of the bus electrode. 3. The gas discharge type display panel according to claim 1, wherein an edge of the transparent electrode disposed within the bus electrode width is an edge on a side located outside the electrode pair. Characteristic gas discharge display panel. 4. A plurality of electrode pairs formed of two discharge electrodes parallel to each other on the same substrate, wherein the discharge electrodes comprise a transparent electrode and a bus electrode made of a metal material.
A gas, wherein the gap between the discharge electrodes is formed by the outer shape line of the transparent electrode, and the gap between the adjacent electrode pair is formed by the outer shape line of the bus electrode. Discharge type display panel.