JP3115884B2 - Plasma display panel and driving method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an AC type plasma display panel (hereinafter, referred to as an AC type plasma display panel).
AC-PDP), and more particularly to its structure and driving method.

[Prior Art] Conventionally, a surface discharge type AC-PDP in which one cell is formed by a total of three electrodes, one selection electrode and two sustain electrodes orthogonal to the selection electrode, is special. It has been proposed in Japanese Unexamined Patent Publication No. 62-259330 or U.S. Pat. No. 4,853,590.

FIG. 5 is a view showing a structure of a surface discharge type AC-PDP proposed in Japanese Patent Application Laid-Open No. 62-259330, in which a selection electrode 51 is vertically arranged on a lower glass substrate 50 functioning as an electrode support substrate. And a plurality of pairs of sustain electrodes 53 and 54 arranged in pairs in a horizontal direction via a dielectric layer 52 made of low-melting glass, on which a low-melting glass layer and a surface are disposed. A transparent upper substrate (not shown), which is covered with a layer (not shown) and forms a gas space with a discharge gas space therebetween, is provided above the layer. An enlarged portion u is formed in the discharge cell corresponding portion of the selection electrode 51 as shown in the figure, and this functions as a cell constituting electrode portion. Further, display electrode portions x, y projecting so as to be close to each other are also formed at the discharge cell corresponding portions of the sustain electrode pairs 53, 54 located above the enlarged portion u of the selection electrode 51. Thus, two discharge units for the two display electrode units x and y are configured with the enlarged portion u of the selection electrode 51 in common, and one display cell d is configured by these two discharge units.

The driving method of the AC-PDP having the configuration shown in FIG. 5 is as follows. FIG. 6 is a diagram showing an operation state of the PDP of FIG. 5, and FIG. 7 is a diagram showing drive waveforms. V _x 55, V _y 56, V _u 57 show voltage waveforms applied to the corresponding electrodes, respectively. , 58 indicate the light output. In this case, it is assumed that the target display cell is already addressed and ignited.

In the period A, the following _holds : V _x = −V _S1 , V _y = V _u = 0, and as shown in FIG. 6, a positive charge is applied to the x electrode of the dielectric layer 52 and a positive charge is applied to the y electrode and the u electrode. Becomes a state where negative charges are accumulated.

Next, in the period B, V _x = V _y = 0, V _u = −VS ₂ , so that the voltage between the x-electrode biased by the wall charges by the discharge and the _u -electrode to which the voltage −VS ₂ is applied is obtained. Thus, the direction of the electric field is opposite to that of the immediately preceding discharge, so that a discharge in the opposite direction occurs. As a result, negative charges are accumulated on the surfaces of the dielectric layer 52 on the x electrode and the y electrode, and positive charges are accumulated on the u electrode.

Next, in period C, a discharge electric field is applied between the y electrode and the u electrode, and V _x = 0, V _y = −V _S1 , V _u = 0, and a dielectric material is applied between the y electrode and the u electrode. A positive charge is stored on the surface of the layer 52 on the y electrode, and a negative charge is stored on both the x and u electrodes.

In next period D, a y electrode, it takes a discharge electric field between the u electrodes, between _{V x = V y = 0,} V u = become -V _S2 biased by wall charges y electrode and u electrodes , A negative charge is accumulated on the surface of the dielectric layer 52 on the x electrode and the Y electrode, and a positive charge is accumulated on the u electrode.

Discharge between the u electrode and the x electrode in the forward direction and the reverse direction sequentially,
Similarly, the discharge between the u electrode and the y electrode in the forward direction and the reverse direction is repeated, and the display is performed.

The discharge can be started by applying a negative high-voltage pulse to one electrode of the sustain electrode pair, for example, the x electrode, and simultaneously applying a positive high-voltage pulse to the u electrode, which is the selection electrode. .

FIG. 8 is a view showing the structure of a surface discharge type AC-PDP proposed in U.S. Pat.
A plurality of X-direction electrodes 61 are provided on the
Protrusions 62, 63 are formed in a direction orthogonal to 1 and the protrusions 62, 63
A pair of Y-direction electrodes 64 and 65 are formed on the substrate. The X-direction electrode 61, the projections 62 and 63, and the Y-direction electrode pair 64 and 65 are covered with an insulator layer 66, on which a protective layer 67 is formed.

A concave portion 72 is formed on the other substrate 71 by etching or the like, and a phosphor layer 73 is formed to form a cell space.

[Problems to be Solved by the Invention] However, the conventional surface discharge type AC-PDP has the following problems. That is, in the structure disclosed in Japanese Patent Application Laid-Open No. 62-259330, the selection electrode and the sustain electrode pair face each other with the insulating layer 52 interposed therebetween. Therefore, there is a problem that power loss occurs, which is an obstacle particularly when the drive circuit is formed into an IC. Further, in the opposing portion of the electrode, the lower selection electrode is covered with the upper sustain electrode, so that the effective area of the electrode is reduced.

On the other hand, in the device disclosed in U.S. Pat. No. 4,853,590, an X-direction electrode 61 and a Y-direction electrode pair 64, 65 are used.
Are opposed to each other with the protrusions 62 and 63 therebetween, so that the distance d
Therefore, the capacitance formed between the X-direction electrode and the Y-direction electrode pair can be reduced. However, as can be easily understood from FIG. It is troublesome, and the discharge space is
There is a problem that the space is limited to the upper space 72.

The present invention solves the above-mentioned problems, and provides a structure of an AC-type plasma display panel having a simple structure and capable of significantly reducing the capacitance formed between electrodes, and a driving method thereof. It is intended for.

Means for Solving the Problems The present invention has been made to find that the above problems can be solved by forming a pair of sustain electrodes on the side surfaces of the cell barrier. That is, the plasma display panel according to the first aspect includes a plurality of selection electrodes formed at a predetermined pitch, and a plurality of line-shaped electrodes having a predetermined pitch formed on the selection electrodes in a direction orthogonal to the selection electrodes. In a plasma display panel in which a first substrate having a cell barrier and a second substrate on which phosphor layers are formed at a predetermined pitch are arranged in parallel and opposed to each other, Sustain electrodes are formed on both side surfaces, and a dielectric layer and a protective layer are further formed on the sustain electrodes in this order,
In addition, an insulator layer is formed between the sustain electrode and the selection electrode.

Further, in the driving method of the plasma display panel according to the present invention, a plurality of selection electrodes formed at a predetermined pitch and a plurality of selection electrodes formed at a predetermined pitch on the selection electrode in a direction orthogonal to the selection electrodes. A plasma display panel, comprising: a first substrate having a line-shaped cell barrier; and a second substrate having phosphor layers formed at a predetermined pitch. Sustain electrodes are formed on both sides of the cell barrier, and a dielectric layer and a protective layer are formed on the sustain electrodes in this order, and between the sustain electrode and the select electrode. In the method for driving a plasma display panel having an insulator layer formed thereon, a driving pulse for maintaining a discharge in each cell is applied to the selection electrode and the sustain electrode.

[Operation] In the AC-PDP according to the present invention, unlike the opposed type AC-PDP, it is not necessary to form a phosphor screen on the electrode, so that deterioration of the phosphor is extremely small. 1
Since the electrode, ie, the selection electrode, and the second and third electrodes, ie, the pair of sustaining electrodes, formed on the wall surface of the cell barrier are close to each other, the operation speed is also excellent.

Since there is almost no portion where the electrodes face each other with the insulating layer interposed therebetween, the capacitance between the electrodes is very small as compared with the conventional surface discharge type AC-PDP, and the accompanying power loss can be greatly reduced. .

Furthermore, in the conventional surface discharge type AC-PDP, discharge was possible only in a limited space above the selection electrode, whereas in the AC-PDP of the structure of the present invention, three electrodes were used in one cell. In this case, most of the cell space can be used as a discharge space.

In addition, during driving, discharge between different electrodes is performed alternately, so that the apparent driving frequency can be increased, and high-luminance display can be achieved.

[Example] Hereinafter, an example will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of the configuration of an AC-PDP according to the present invention, and FIG. 2 is a bird's-eye view showing a schematic configuration on the lower substrate side, wherein 1 is a lower substrate, and 2 is a selection electrode. Reference numeral 3 denotes a cell barrier, 4 denotes an insulator layer, 5 denotes a sustain electrode, 6 denotes an insulator layer, 7 denotes a protective layer, 8 denotes an upper substrate, 9 denotes a phosphor layer, and 10 denotes a cell barrier space.

In FIG. 1 and FIG.
Are arranged at a predetermined pitch, a plurality of cell barriers 3 are formed at a predetermined pitch in a direction orthogonal to the selection electrodes 2, and an insulator layer 4 is formed thereon. .

A pair of sustain electrodes 5 _L and 5 _R are formed on the insulator layer 4 on both sides of the cell barrier 3, an insulator layer 6 is formed thereon, and a protective layer is further formed thereon. 7 are formed. In FIG. 2, the insulator layer 6 and the protective layer 7 are omitted for easy understanding.

On the upper substrate 8, which is the other substrate, phosphor layers 9 are formed at a predetermined pitch. Therefore, a cell space 10 is formed by the selection electrode 2, the pair of sustain electrodes 5 _L and 5 _R and the phosphor layer 9.

In FIGS. 1 and 2, the sustain electrode pairs 5 _R and 5 _L are formed only on the side surfaces of the cell barrier 3. May be. In the structure shown in FIGS. 1 and 2, light emission may be observed from the upper substrate 8 side, or the lower electrode 1 may be formed by forming the selection electrode 2 with a transparent electrode such as ITO. It is also possible to perform from the side of.

According to the above configuration, since the area and selection electrode 2 is sustain electrodes 5 _R and the selection electrode 2 facing sustain electrodes 5 _L area becomes very small opposing the capacitance between these electrodes is very It will be small.

Next, a driving method will be described. For driving the AC-PDP shown in FIGS. 1 and 2, the conventional driving method shown in FIG. 7 is adopted. That is, as shown in FIG.
The V _u 57 is applied, sustain electrode pairs 5 _R, 5 one electrode of the _L, and for example, the electrode 5 V _x 55 in FIG. 7 is _L, and the other electrode, for example electrode 5 _R
Vy 56 shown in FIG.

This allows the selection electrode 2 to be formed in the same manner as described above.
And between the sustain electrodes 5 _L, and since the discharge alternating between selected electrode 2 and sustain electrode 5 _R occurs, increasing the number of times the light is output as shown at 58 in Figure 7, the apparent Te following The above driving frequency can be increased.

Next, a method of manufacturing the AC-PDP shown in FIGS. 1 and 2 will be described.

First, a predetermined number of selection electrodes 2 are formed in parallel with each other at a predetermined pitch on a lower substrate 1 made of glass by a normal thin film process. Next, line-shaped cell barriers 3 are formed in a direction orthogonal to the selection electrodes 2 by multilayer printing of silk screen printing at a predetermined number and a predetermined pitch. Then, in order to attach the cell barrier 3 to the lower substrate 1 at 600 ° C., 30 ° C.
Bake in minutes.

After the firing, the insulator layer 4 is formed on one surface by a vapor deposition method, and then the sustain electrodes 5 _L and 5 _R are formed on the side surfaces of the cell barrier 3. This can be achieved by vapor deposition using a mask pattern having openings only at positions corresponding to the side surfaces. Here, aluminum Al was used as a deposition material for the selection electrode 2 and the sustain electrodes 5 _L and 5 _R.

After the formation of the sustain electrodes 5 _L and 5 _R , the insulator layer 6 and the protective layer 7 are sequentially formed by a vapor deposition method. SiO ₂ was used as the material of the insulator layers 4 and 6, and MgO was used for the protective layer 7.

Next, a phosphor layer 9 is formed on the upper substrate 8 made of glass. This is performed by adding a diazonium salt to a slurry liquid in which phosphor powder is dispersed in an aqueous PVA solution to have photosensitivity. The entire surface of the upper substrate 8 is coated with a uniform film thickness by a blade coater. After drying, exposure with ultraviolet light is performed through a predetermined mask pattern, and shower development is performed. The above steps were repeated for three colors of red phosphor, green phosphor and blue phosphor to form the phosphor layer 9.

The upper substrate 8 and the lower substrate 1 manufactured in the above steps were sealed, and after a predetermined evacuation step, a mixed gas of He and Xe having a mixing ratio of 0.989: 0.011 by volume was sealed at 500 Torr.

When the above-described drive pulse was applied to this, it was confirmed that the intended purpose could be achieved.

As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, A various deformation | transformation is possible. For example, in the above embodiment, the cell barrier is formed on the lower substrate. However, the cell barrier can be formed on the substrate. In short, in the present invention, a pair of sustain electrodes is formed on both side surfaces of the cell barrier. It is good enough.

There are various methods for forming the sustain electrode pairs other than the above method. For example, after the cell barrier 3 and the insulator layer 4 are formed, the resist layer 20 is formed as shown in FIG. Is formed, and then an electrode material is deposited to form a deposited layer 21. Next, the resist layer 20 is removed. As a result, the deposited layer on the resist layer 20 is lifted off, and the state shown in FIG. Next, the deposited layer remaining on the top 22 of the cell barrier 3 is removed by a suitable method such as polishing. This allows
As shown in FIG. 3C, the sustain electrode pairs can be formed only on both side surfaces of the cell barrier 3.

In addition, the sustain electrode pair can be formed by the method shown in FIG. That is, it is the same in that the resist layer 20 is formed, but thereafter, a resist layer 25 is formed on the top of the cell barrier 3 by a screen printing method, and then an electrode material is deposited to form a deposited layer. The resist layers 20 and 25 are removed. According to this, the deposited layers on the resist layers 20 and 25 are lifted off, so that the sustain electrode pairs can be formed only on the side surfaces of the cell barrier 3 as shown in FIG.

[Effects of the Invention] As is clear from the above description, according to the present invention, the capacitance between the electrodes can be significantly reduced as compared with the conventional art, so that the luminous efficiency can be greatly improved. it can. In addition, since the power loss becomes extremely small due to the decrease in the capacitance, the load on the drive circuit is reduced, which is advantageous in implementing an IC.

Furthermore, since the three electrodes are arranged three-dimensionally in one cell, most of the cell space can be used as a discharge space, so that luminance and luminous efficiency are improved. In addition, since a protective layer is not required on the phosphor screen, there is an effect that the number of manufacturing steps can be reduced.

Further, at the time of driving, since discharge is alternately generated between different electrodes, the apparent driving frequency can be increased, and as a result, the emission luminance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a plasma display panel according to the present invention, FIG. 2 is a bird's-eye view showing a schematic configuration on the lower substrate side, FIG. 3 is a view showing an example of a method of forming a sustain electrode pair, and FIG. FIG. 5 is a view showing another example of a method of forming a sustain electrode pair, FIG. 5 is a perspective view showing a configuration example of a conventional surface discharge type AC-PDP, and FIG.
FIG. 7 is a diagram for explaining the discharge of the AC-PDP shown in FIG. 7, and FIG. 7 is a diagram showing a drive pulse applied to the AC-PDP shown in FIG.
FIG. 8 is a cross-sectional view showing another configuration example of the conventional surface discharge type AC-PDP. 1 lower substrate, 2 selection electrodes, 3 cell barriers, 4
...... Insulator layer, 5 ... sustain electrode, 6 ... insulator layer, 7 ...
... Protective layer, 8 ... Upper substrate, 9 ... Phosphor layer, 10 ... Cell barrier space.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-212743 (JP, A) JP-A-48-47271 (JP, A) JP-A-62-259330 (JP, A) Masanori Fukuda, 2 Name, “Barrier electrode type ac plasma display (2)”, IEICE technical report, IEICE, October 1990, Vol. 90, No. 288, p. 55-60 (58) Field surveyed (Int. Cl. ⁷ , DB name) H01J 11/00-11/02 H01J 17/49 H01J 17/04 G09G 3/28 JICST file (JOIS)

Claims (2)

(57) [Claims] A first selection electrode formed at a predetermined pitch and a plurality of linear cell barriers formed at a predetermined pitch on the selection electrode in a direction orthogonal to the selection electrode; And a second substrate on which a phosphor layer is formed at a predetermined pitch is disposed in parallel with each other, and sustain electrodes are provided on both side surfaces of the linear cell barrier. And a dielectric layer and a protective layer are formed on the sustain electrode in this order, and an insulator layer is formed between the sustain electrode and the select electrode. Plasma display panel. A plurality of selection electrodes formed at a predetermined pitch, and a plurality of linear cell barriers formed at a predetermined pitch on the selection electrode in a direction orthogonal to the selection electrodes. And a second substrate on which a phosphor layer is formed at a predetermined pitch is disposed so as to face in parallel with each other, and is maintained on both side surfaces of the linear cell barrier. An electrode is formed, a dielectric layer and a protective layer are formed on the sustain electrode in this order, and an insulator layer is formed between the sustain electrode and the select electrode. A method of driving a panel, comprising: applying a driving pulse for maintaining a discharge in each cell to the selection electrode and the sustain electrode.