JP3144987B2 - Gas discharge display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC plasma display panel (hereinafter referred to as "PDP") type gas discharge type display device which emits and displays characters and images using gas discharge.

[0002]

2. Description of the Related Art There are various types of gas discharge type display devices. One type suitable for displaying images is an AC type plasma display panel. This type of gas discharge type display device has a memory function as disclosed in JP-A-61-39341 and the like, and is configured as shown in FIGS. That is, the scanning electrodes 1a, 1b
Are arranged on the inner surface of the first glass substrate 3 forming the envelope, and a dielectric covering the electrode group is arranged. Layer 4
A protective film layer 5 is laminated thereon. A plurality of address electrodes 7a, 7b,... Facing the protective film layer 5 via the discharge space 6 and three-dimensionally intersecting with the electrode group are arranged on the inner surface of the second glass substrate 8 forming the envelope. . The dielectric layer 4 is made of borosilicate glass or the like, and the protective film layer 5 is made of magnesium oxide or the like.

In the write operation of such a display device, a positive write pulse voltage Vw shown in FIG.
Are applied to a predetermined address electrode (for example, the electrode 7a), and negative scanning pulse voltages Vs shown in FIGS. 16B to 16D are applied to the scanning electrodes 1a, 1b,. As a result, discharge occurs at the intersection W between the predetermined address electrode 7a and the scanning electrodes 1a, 1b,..., And positive charges are accumulated on the surface of the protective film layer 5 (writing cell) at the intersection W.

Following the write operation, a sustain discharge operation is started. In the sustain discharge operation, FIG.
Are applied to the sustain discharge electrodes 2a, 2b,... And (b) to (d) of FIG.
The negative scanning pulse voltage Vs shown in FIG.
Are applied alternately. The first sustain discharge pulse voltage Vs' releases the positive charges on the surface of the protective film layer 5, and the sustain charges are repeated in the S portion of FIG. Thereafter, the negative erase pulse voltage Ve having a short time width shown in FIG. 16E is applied to the sustain discharge electrodes 2a and 2b.
, And the electric discharge on the surface of the protective film layer 5 in the S portion completely disappears, and the sustain discharge operation ends.

In the display device of the AC PDP type configured as described above, in the S portion after the end of the application of the sustain discharge pulse voltage Vs' in the sustain discharge operation, the accumulated charge amount on the surface of the protective film layer 5 is obtained. Are not changed between scan electrodes 1a, 1b... And sustain discharge electrodes 2a, 2b.
Set to a value different from s. Along with this, the time width of the erase pulse voltage Ve is set short, so that the erase pulse voltage Ve
The residual charge on the surface of the protective film layer 5 in the S portion after the application of the voltage is completely eliminated.

In the display device shown in FIGS. 17 and 18,
In order to display a color image, three types of phosphor films R, G, and B that emit red, green, and blue light are provided on the inner surface of the second glass substrate 8. Three types of phosphor films R, G,
B corresponds to each of three discharge portions (S portions) located in one pixel region P of a substantially square shape, and emits excitation light by receiving ultraviolet rays generated by the discharge in the S portion.

[0007]

In the display device of the AC type PDP type, it is relatively easy to regulate the discharge current. However, as described above, the condition of the erasing operation is strictly set. As a result, faithful image reproduction cannot be expected.
On the other hand, the potential in the S portion tends to vary from discharge cell to discharge cell, and the characteristics also change over time. In addition, since the time width of the erasing pulse voltage Ve is small, if the fluctuation causes the start of the erasing discharge to be delayed, the residual charge in the S portion cannot be completely eliminated.

Further, when the positive charges accumulated at the intersection W on the surface of the protective film layer 5 at the intersection W move to the S portion, the distance from the intersection W to the position S1 and the distance from the intersection W to the position S2 are increased. , There is a difference in the amount of positive charge transfer to the position S1 and the position S2. That is, S
Since the charge distribution in the portion becomes non-uniform, when the erase pulse voltage is applied, the charge on the surface of the protective film layer 5 in the S portion becomes uneven, and it is difficult to perform the erasing operation uniformly over the entire S portion. was there.

When a color image is displayed, if the width of each of the scanning electrode and the sustaining discharge electrode in the S portion is made small in order to secure a substantially square one pixel region P,
Since the discharge area is also small, there is a problem that it is difficult to obtain a sufficient emission luminance particularly in a device for displaying a large color image.

It is therefore an object of the present invention to provide an AC PDP type display device capable of performing an erasing operation reliably. Another object is to efficiently obtain a high-luminance color image.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a first glass substrate forming an envelope.
Are arranged in a plane and are connected to a scanning electrode and this scanning electrode.
A plurality of pairs of the first and second pairs of sustain discharge electrodes are arranged in parallel.
An electrode group and a dielectric layer covering the first electrode group.
Protective film layer and the protective film layer
Inner surface of the second glass substrate forming the envelope to fit
An electrode that is provided on the top and crosses the first electrode group three-dimensionally.
A dress electrode and an erase electrode along the address electrode.
And a plurality of pairs of second electrode groups consisting of:
And the sustain discharge electrode is engaged with the comb teeth.
Are formed in a comb shape facing each other with a small space
The address electrodes are located at positions facing the comb teeth of the scanning electrodes.
A gas discharge type display device characterized by being arranged along the longitudinal direction of the comb teeth .

[0012]

According to the present invention, the scan electrode and the sustain discharge electrode are formed in a comb shape, and the respective comb teeth are arranged so as to mesh with a small interval, and the address electrode faces the scan electrode comb tooth. Since the write charges are arranged along the longitudinal direction of the comb teeth, the write charges are uniformly distributed on the surface of the protective film layer on the comb teeth of the scan electrode. In addition, charge transfer (sustain discharge) between the scan electrode and the sustain discharge electrode during the sustain discharge operation occurs uniformly on the engagement portion of the comb teeth,
Electric charges remaining on the surface of the protective film layer on the comb teeth of both electrodes can be uniformly eliminated by the erasing discharge.

[0013] The row erase discharge by applying positive and negative pulse voltage respectively to the sustain discharge electrodes and the address electrodes
Cormorants time, tends to be induced discharge even between the address electrode and the scan electrode. Therefore, the difference between the surface potential of the protective film layer on the scan electrode after the erasing operation and the surface potential of the protective film layer on the sustain discharge electrode is definitely zero.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
I will explain while.

FIGS. 1 to 5 show a gas discharge type according to the present invention.
2 shows a basic configuration of a display device. As shown in FIGS. 1 and 2, a plurality of pairs of electrode groups each including a comb-shaped scan electrode 10 and a comb-shaped sustain discharge electrode 11 are formed on an inner surface of a first glass substrate 9 forming an envelope. Is provided. The scanning electrode 10 and the sustaining discharge electrode 11 of each pair are opposed to each other with a small space therebetween so that the respective comb teeth mesh with each other, and the protective film layer 13 is formed on the dielectric layer 12 covering the electrode group.
Are laminated. Further, the discharge space 14 is formed on the protective film layer 13.
The address electrodes 15 facing each other are provided on the inner surface of the second glass substrate 16 of the envelope. The address electrodes 15 are arranged at positions facing the comb teeth of the scanning electrode 10 along the longitudinal direction of the comb teeth. The dielectric layer 12 is made of borosilicate glass or the like, and the protective film layer 13 is made of magnesium oxide or the like. 17 is an insulating partition wall.

In the writing operation of the AC-type PDP type display device configured as described above, a positive write pulse voltage Vw shown in FIG.
Is applied to the plurality of scanning electrodes 10 in FIG.
The negative pulse voltage Vs shown in (d) is sequentially applied.
Uniform write discharge occurs in the W portion where the address electrode 15 and the scan electrode 10 face each other, and positive write charge is uniformly distributed and accumulated on the surface of the protective film layer 13 on the comb teeth of the scan electrode 10.

In the sustain discharge operation, the sustain discharge electrode 1
1 shows the negative sustain discharge pulse voltage Vs shown in FIG.
Then, the negative pulse voltages Vs shown in FIGS. 3B to 3D are alternately applied to the scanning electrodes 10. The positive write charge is released by the first sustain discharge pulse voltage, and this is used as a starting pulse to generate a sustain discharge. Since the comb teeth of the scanning electrode 10 and the sustain discharge electrode 11 are arranged in parallel, the sustain discharge in the portion S occurs uniformly without difference between the position S1 and the position S2. In other words, the transfer of the electric charge in the S portion during the sustain discharge operation is performed evenly and uniformly.

In the erasing operation, a positive pulse voltage Va is applied to the sustain discharge electrode 11, and a negative pulse voltage Ve is applied to the address electrode 15, respectively. The electric charge remaining on the surface of the protective film layer 13 in the S portion disappears due to the discharge, and the discharge between the address electrode 15 and the sustain electrode 11 causes the discharge between the address electrode 15 and the scan electrode 10. Discharge is also induced in between. For this reason, the charges remaining in the protective film layer 13 in the S portion can be completely and completely eliminated. That is, even when the discharge stop voltage varies from discharge cell to discharge cell or changes with time, the voltage between the surface of the protective film layer 13 on the scan electrode 10 and the address electrode 15 is changed to the protective film layer on the sustain discharge electrode 11. 13 and the voltage between the address electrode 15 and the address electrode 15. Further, since a discharge is caused between the address electrode 15 and the sustain discharge electrode 11 during the erasing operation, it is not necessary to use a narrow erasing pulse voltage, and the problem of a delay in the discharge start timing due to fluctuations is solved.

In a display device for displaying a color image, as shown in FIGS. 4 and 5, three types of phosphor films R, G, and B for emitting red, green, and blue light are formed on the second glass substrate 16, respectively. It is provided on the inner surface. Three types of phosphor films R,
G and B are provided corresponding to the three S portions located in the substantially square one pixel region P, respectively. in this case,
Since the S portion is provided along the longitudinal direction of the comb teeth at the position facing each comb tooth of the scanning electrode 10 and the sustain discharge electrode 11, the discharge region is relatively wide, and higher emission luminance can be obtained. In the configuration shown in FIG. 5, the phosphor films R, G, and B expose the address electrodes 15,
The address electrodes 15 may be completely covered.

FIGS. 6 to 8 show an embodiment of the present invention.
Ri, where the configuration shown in FIGS. 6 and 7 differs from the configuration shown in FIGS. 1 and 2 is only that a plurality of erasing electrodes 18 on the inner surface of the second glass substrate 16 is provided,
Other configurations remain unchanged. Each erase electrode 18 is arranged at a position facing the comb teeth of the sustain discharge electrode 11 along the longitudinal direction of the comb teeth.

In the display device configured as described above, a discharge is generated between the sustain discharge electrode 11 and the erase electrode 18 during the erase operation. That is, the positive pulse voltage Va shown in FIG. 8E is applied to the sustain discharge electrode 11,
A negative erase pulse voltage Ve shown in FIG.

Since the erasing electrode 18 and the comb teeth of the sustain discharge electrode 11 are opposed to each other in parallel with the discharge space 14 interposed therebetween, discharge between the erasing electrode 18 and the comb teeth of the sustain discharge electrode 11 can be achieved. 6, which occurs evenly and uniformly, and the surface potential difference of the protective film layer 12 on each of the comb teeth of the scan electrode 10 and the sustain discharge electrode 11 can be more reliably reduced to zero. In this case, there is no need to apply pulse voltages of both positive and negative electrodes to the address electrode 15 (as in FIG. 3A), so that the power supply circuit for the address electrode 15 can be simplified. The material of the erase electrode 18 is Ag, Ni, I, similarly to the material of the address electrode 15.
A good conductive material such as TO or SnO2 can be used.

Since a negative pulse voltage is applied to the erasing electrode 18, the erasing electrode 18 functions as a cathode. Therefore, if the erase electrode 18 is formed of a cathode material, a stable discharge effect can be obtained even if a low pulse voltage is applied during the erase operation. That is, since at least one of the negative erasing pulse voltage Ve shown in FIG. 8F and the positive erasing pulse voltage Va shown in FIG. 8E can be lowered, a reliable erasing operation with low power consumption can be achieved. Obtainable.

Preferred cathode materials include Al, N
i, metals such as LaB6, La (x) Sr (1-x) CoO3, L
An oxide such as a (x) Sr (1-x) MnO3 can be used.

The electrode structure of the present invention shown in FIGS. 6 and 7
When the display device of (1) is used for displaying a color image, FIG.
As in FIG. 5 and FIG. 5 , three types of phosphor films are formed on the second glass substrate 1 so as to correspond to the three S portions in one pixel region, respectively.
6 on the inner surface.

FIG. 9 shows another embodiment of the present invention . This case is the same as the embodiment shown in FIG. 8 except for the erase operation. When the erase electrode 18 is formed of a cathode material, a stable discharge can be obtained even when a low erase pulse voltage is used as described above, and a reliable erase operation can be obtained. Ve is applied to extinguish residual charges on the surface of the protective film layer 13. That is, FIG.
Since the erasing operation is performed only by applying the negative pulse voltage Ve shown in FIG.
Only a negative pulse voltage needs to be applied to 1 (a pulse voltage of both positive and negative polarities is unnecessary), and the driving circuit can be simplified and the power consumption can be reduced.

Further, in the electrode configuration shown in FIGS.
Therefore, as shown in FIGS. 10 and 11, the scanning electrodes 10 and
And sustain discharge electrode 11 are connected to two discharge cells a and b, respectively.
Although it can be configured to have one comb tooth per unit,
A corresponding embodiment of the present invention is shown in FIGS.
ing. Also in the embodiment shown in FIGS. 12 and 13,
The scan electrode 10 and the sustain discharge electrode 11 are each formed to have one comb tooth in units of two discharge cells a and b. In this case, the erasing electrode 18 is provided over the two discharge cells a and b. Each of the erasing electrodes 18 may be formed of two thin lines shown by a two-dot chain line in the figure, but since the same voltage is applied, it is better to form one of the thick lines shown by a solid line. It is easy to manufacture, and the manufacturing yield can be improved.

In this case, it is needless to say that three kinds of phosphor films for displaying a color image can be provided in the same manner as in the examples shown in FIGS .

[0029]

As described above, according to the present invention, the sustain discharge
And erase operations are uneven on the surface of the protective layer on both comb teeth.
Achieved uniformly and reliably without any problems and good image reproduction effect
Can be obtained. During the erase operation, the sustain discharge
Discharge between the electrode and the erase electrode.
For this reason, scan electrodes and sustain discharge electrodes are held on each comb tooth.
The surface potential difference of the protective layer can be more reliably reduced to zero.
Wear.

[Brief description of the drawings]

FIG. 1 is a plan view showing an electrode configuration of a display device related to the present invention .

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a waveform diagram of a driving pulse voltage for the display device .

FIG. 4 shows a case where a color image is displayed on the display device .
Plan view showing the electrode configuration of

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a plan view showing an electrode configuration of a display device according to an embodiment of the present invention .

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a waveform diagram of a driving pulse voltage for a display device according to another embodiment of the present invention.

FIG. 9 is a waveform diagram of a driving pulse voltage for a display device according to another embodiment of the present invention.

10 shows another example of the electrode configuration of the display device shown in FIG .
Ground plan

11 is a sectional view taken along the line AA of FIG.

FIG. 12 is a plan view showing an electrode configuration of a display device according to another embodiment of the present invention.

13 is a sectional view taken along line AA of FIG.

FIG. 14 is a plan view showing an electrode configuration of a conventional AC PDP display device.

15 is a sectional view taken along line AA of FIG.

FIG. 16 is a waveform diagram of a driving pulse voltage for a conventional AC PDP type display device.

FIG. 17 is a plan view showing an electrode configuration of a conventional AC PDP type display device.

18 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 Reference Signs List 9 first glass substrate 10 scan electrode 11 sustain discharge electrode 12 dielectric layer 13 protective film layer 14 discharge space 15 address electrode 16 second glass substrate 18 erase electrode R, G, B phosphor film

Continuation of the front page (72) Inventor Koichi Gota 1-1, Sachimachi, Takatsuki City, Osaka Prefecture Matsushita Electronics Corporation (56) References JP-A-3-55746 (JP, A) JP-A-6-55746 96673 (JP, A) JP-A-50-68227 (JP, A) JP-A-60-246543 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 11/00

Claims (2)

(57) [Claims] 1. An inner surface of a first glass substrate forming an envelope
And arranged in parallel with the scanning electrode.
A plurality of pairs of first electrodes, each of which is paired with a set sustain discharge electrode.
An electrode group and a dielectric layer that covers the first electrode group.
Facing the protective film layer through a discharge space.
On the inner surface of the second glass substrate forming the envelope
And an electrode which is provided at the
Address electrode and erase electrode along this address electrode
A plurality of pairs of second electrode groups, and
And both the sustain discharge electrodes and the comb teeth are meshed with each other
It is formed in the shape of a comb facing each other at a minute interval so that
The address electrode is at a position facing the comb teeth of the scanning electrode,
A gas discharge display device characterized by being arranged along the longitudinal direction of the comb teeth . 2. An erasing electrode comprising a cathode material.
The gas discharge type display device according to claim 1, wherein: