JPH04306535A - Plasma display panel - Google Patents

Abstract

PURPOSE:To provide a long-lived plasma display panel by utilizing not surface discharge but oblique discharge between a maintenance electrode and the protruding part of a Y-electrode to reduce the deterioration due to sputtering of the edge part of the electrode. CONSTITUTION:A glass 1 having a Y-electrode 4 covered with a dielectric film 5, and a glass base 2 having plural pairs of writing electrodes 3 and maintenance electrodes 7 covered with the dielectric film 5 are opposed to each other with keeping a determined discharge gap, and airtightly sealed. A dischargeable rare gas is sealed therein, and the Y-electrode 4 has a comb-like protrusion parallel to the writing electrodes 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to AC type plasma display panels, and more particularly to large plasma display panels with internal memory operation.

0002

2. Description of the Related Art Regarding AC type plasma display panels (hereinafter referred to as PDPs), surface discharge type PDPs for the purpose of color display have been rapidly put into practical use in recent years. Figure 9 shows an AC surface discharge type PDP.
FIG. 2 is a cross-sectional view of a panel showing a typical structure. On the glass substrate 11, parallel X electrodes 13 covered with a dielectric film 15 are formed. The X electrode 13 is formed, for example, as a transparent SnO2 electrode or an ITO electrode, and functions as a write electrode. On the other hand, glass substrate 1
A plurality of pairs of electrodes, each consisting of a scanning electrode 14 and a sustaining electrode 17, which are parallel to each other and are covered with a dielectric film 15, are formed on the electrode 2. Further, a phosphor 16 is coated on the X electrode 13 on the glass substrate 11 side with a dielectric film 15 interposed therebetween so as to be located between the scan/sustain electrode 14 and the sustain electrode 17 which face each other.

In such a surface discharge type AC type PDP,
The scan/sustain electrode 14 has both a scan function and a sustain function. That is, when writing, by applying a write pulse to the X electrode (write electrode) 13 in response to a scan pulse applied to the scan/sustain electrode 14, the X electrode 13 and the scan/sustain electrode 14 are connected. Generate a discharge between. Thereafter, by successively applying sustain pulses with mutually opposite phases between the scan/sustain electrode 14 and the sustain electrode 17, a surface discharge is maintained between the scan/sustain electrode 14 and the sustain electrode 17, and the A color display can be obtained by exciting the phosphor 16 with ultraviolet light generated by a surface discharge. In this type of PDP, since the phosphors 16 are not directly bombarded by ions, a long-life color PDP can basically be expected, and therefore, practical research is rapidly being conducted as the structure is suitable for color PDPs. It is progressing.

[0004]Nowadays, as the demand for large screen size for public display is increasing, the usefulness of surface discharge type display is increasing even for monochrome display. The reason for this is that it is extremely difficult in terms of manufacturing technology to form the low-resistance transparent electrodes required in the conventional counter-electrode type with a high yield, whereas in the surface discharge type,
Even if the writing electrode is replaced from a transparent electrode to a metal electrode,
This is because uniform light emission can be obtained regardless of the pixel size, and because the surface discharge type has a larger memory margin than the facing type, it can provide sufficient voltage margin even when the panel is large.

[0005]

However, PDPs using surface discharge have a problem in that the edge portions of the electrodes are easily damaged by ion bombardment due to strong concentration of discharge. In AC surface discharge type PDPs, MgO is usually formed as a discharge-resistant protective layer on the dielectric layer covering the electrodes, but compared to the facing type, discharge starts at the electrode edges in a much shorter time. An increase in voltage is observed. In the case of color PDPs, since Xe gas having a large mass is added, deterioration occurs more quickly than in the case of monochrome PDPs, which is a problem in practical use. Recently, research has been conducted to improve the life characteristics by adding Ne to the conventional gas composition He+Xe, but no satisfactory results have been obtained yet.

[0006]

[Means for Solving the Problems] The PDP of the present invention has a first
A group of Y electrodes (scanning and sustaining electrodes) covered with a dielectric film is provided on the second substrate, and a group of X electrodes (including write electrodes and sustaining electrodes) covered with a dielectric film is provided on the second substrate. A pair of X electrodes (a write electrode and a sustain electrode) are provided, the first substrate and the second substrate are opposed to each other, and one pixel is connected to a pair of X electrodes (a write electrode and a sustain electrode).
The basic structure is composed of three electrodes: a It is characterized by a comb-shaped electrode shape,
By utilizing oblique discharge between the sustain electrode, which is one electrode of the pair of X electrodes, and the Y electrode, the characteristics of the surface discharge type can be avoided without impairing the life-span problems of the surface discharge type. This solves the problem.

The PDP of the present invention also includes a Y electrode group (scan/sustain electrode group) covered with a dielectric film on the first substrate.
, a group of X electrodes (a write electrode and a sustain electrode form a pair) covered with a dielectric film are provided on a second substrate,
The basic structure is that the first substrate and the second substrate are opposed to each other, and one pixel is composed of three electrodes: a pair of X electrodes (writing electrode and sustain electrode) and a Y electrode. One of the electrodes of the X electrode group or the Y electrode group has a comb-shaped electrode shape so that the electrodes and the Y electrodes face each other and are parallel to each other. Ultraviolet light generated by oblique discharge between the sustain electrode and the Y electrode excites the phosphor deposited on the dielectric film formed on the first substrate side along the Y electrode. By doing so, it is possible to obtain an arbitrary color display.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a perspective view of a PDP showing a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA' of the embodiment shown in FIG. In these figures, comb-shaped Y electrodes (scan/sustain electrodes) 4 having busbars and branch-like electrodes extending from the busbars are formed on a glass substrate 1, and these electrodes are covered with a dielectric film 5. The Y electrode 4 can be formed as a thick film electrode using Ag or the like, for example. On the other hand, on the glass substrate 2,
A plurality of pairs of write electrodes 3 and sustain electrodes 7 are formed, and these electrodes are covered with a dielectric film 5.

The glass substrate 1 and the glass substrate 2 are
The generatrix of the electrode 4 and the write electrode 3 and the sustain electrode 7 are orthogonal to each other, and the branch electrodes of the Y electrode 4 and the write electrode 3 are perpendicular to each other.
They are placed opposite each other and are hermetically sealed so that they are parallel to each other, and a rare gas capable of discharging is filled inside. In addition, Figure 2
In order to simplify the drawing, the busbar portion of the Y electrode 4 is not shown.

Next, the basic operation of the PDP of the first embodiment will be explained using the drive waveform shown in FIG. In FIG. 3, 4-1 is a voltage waveform applied to the Y electrode 4 in the first row, and 4-2 is a voltage waveform applied to the Y electrode 4 in the second row. As shown by the voltage waveforms 4-1 and 4-2 in FIG. 3, scanning pulses are sequentially applied to the Y electrode 4. Now 1
When a write pulse is applied to the write electrode 3 in column m (see 3-m in FIG. 3) in synchronization with the scanning pulse applied to the Y electrode in row 1 (see 4-1), the Y electrode in row 1 and m A discharge is generated in the portion facing the column write electrode, and as a result, wall charges are generated on the electrode in this portion. After that, by continuously applying a sustain pulse to the sustain electrode 7 paired with the write electrode 3 and the Y electrode 4 in the first row as shown in FIG. A diagonal discharge is maintained between the eye Y electrode 4 and the sustain electrode 7.

When a write pulse is not applied to the write electrode 3, even if a sustain pulse is applied between the Y electrode 4 and the sustain electrode 7, oblique discharge will not occur unless there is a wall charge due to the write operation. It cannot occur. Also, Y
The erase pulse applied prior to the scan pulse applied to the electrode 4 is a pulse for erasing the wall charge on the Y electrode before entering the write operation, that is, the corresponding Y
It has the function of once clearing all wall charges (memory) on the electrodes.

Although not shown in FIGS. 1 and 2, the busbar portion of the Y electrode 4 is covered with an insulating layer that also serves as a barrier rib to prevent unnecessary discharge that would adversely affect the above-mentioned operation. be able to.

FIG. 4 shows a PD showing a second embodiment of the present invention.
It is a perspective view of P. This embodiment differs from the first embodiment shown in FIG.
The phosphor 6 is formed and adhered to a portion along the electrode 4. Therefore, in this second embodiment, the phosphor 6 is excited by the ultraviolet rays generated by the oblique discharge between the Y electrode 4 and the sustain electrode 7, and a color display can be obtained.

FIG. 5 shows a PDP showing a third embodiment of the present invention.
FIG. The sectional view taken along line AA' in FIG. 5 is as shown in FIG. 2, similar to the first embodiment. In FIG. 5, glass substrate 1
Y electrodes (scanning/sustaining electrodes) 4 which are parallel to each other are formed above, and these electrodes are covered with a dielectric film 5 . The Y electrode 4 can be formed as a metal electrode using thick film technology. On the other hand, a plurality of pairs of write electrodes 3 and sustain electrodes 7 are formed on the glass substrate 2 by, for example, thick film technology, and these electrodes are covered with a dielectric film 5.

The feature of the third embodiment is that the write electrode 3 and the sustain electrode 7 each have a comb-like electrode shape having a bus bar and branch electrodes extending from the bus bar. The write electrode 3 and the sustain electrode 7 are formed so that their respective generatrix lines are parallel to each other, and their respective branch electrodes are formed to be parallel to each other. The glass substrate 1 and the glass substrate 2 are arranged such that the Y electrode 4 and the generatrix of the write electrode 3 and the sustain electrode 7 are perpendicular to each other, and the Y electrode 4 and the branch electrodes of the write electrode 3 are facing each other and parallel to each other. They are placed facing each other and hermetically sealed, and a rare gas capable of discharging is filled inside. The basic operation of the PDP of the third embodiment is as follows.
Just as in the case of the embodiment, the explanation can be made using the drive waveform shown in FIG. 3, so a description thereof will be omitted here.

[0016] As in the case of the first embodiment, the busbar portion which adversely affects the operation can be covered with an insulating layer which also serves as a barrier rib.

FIG. 6 shows a PD showing a fourth embodiment of the present invention.
It is a perspective view of P. This fourth embodiment differs from the third embodiment shown in FIG. 5 in that a phosphor 6 is deposited on the dielectric film 5 of the glass substrate 1 along the Y electrode 4. be. In this embodiment as well, the phosphor 6 is excited by the ultraviolet rays generated by the discharge, as in the second embodiment.
Color display can be obtained.

FIG. 7 is a perspective view showing a fifth embodiment of the present invention, which is an example having a barrier rib structure to prevent color mixing due to crosstalk. In FIG. 7, 1 to 7 are the first
Since this embodiment is the same as that of the embodiment, the explanation will be omitted. Reference numeral 8 denotes barrier ribs formed by thick film technology on the dielectric film 5 formed on the glass substrate 2 side. In this embodiment, crosstalk in the X and Y directions can be completely prevented by the barrier ribs 8. However, since each pixel is completely separated by the barrier rib 8, it is necessary to improve the reliability of writing to each pixel.

FIG. 8 is a perspective view showing a sixth embodiment of the present invention, in which charge coupling between cells in the Y direction is strengthened by making the height of the barrier ribs in the X direction lower than the height of the barrier ribs in the Y direction. Therefore, writing reliability is extremely high. However, since there is a gap between pixels in the Y direction,
Compared to the fifth embodiment shown in FIG. 7, the crosstalk in the Y direction becomes stronger. Therefore, in this case, it is desirable to arrange phosphors of the same color in the Y direction.

[0020]

[Effects of the Invention] As explained above, the present invention uses diagonal discharge without using surface discharge, which has a problem with life, and can reduce deterioration caused by sputtering at the edge of the electrode, resulting in longer life. It has the effect of realizing In addition, the memory margin is the same as that of the surface discharge type.
Since the value is more than twice that of the opposing type, sufficient voltage margin is ensured even in monochrome or color display panels that require a large screen size, resulting in extremely stable and reliable operation. It is possible to do so.

Furthermore, according to the electrode structure according to the present invention, it is possible to express a wide range of pixel sizes with uniform light emission without using transparent electrodes, and in particular, it is possible to express a wide range of pixel sizes with uniform light emission, and especially for large screens and large pixel sizes for public display. It has an electrode structure that is extremely suitable for monochrome or color PDPs. Therefore, it is possible to avoid the yield problem of transparent electrodes, which is the most problematic problem in the manufacture of large-sized PDPs, and it is therefore possible to achieve the effect of realizing an extremely high manufacturing yield.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a panel showing a first embodiment of the present invention.

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

FIG. 3 is a diagram showing drive waveforms for explaining the operation of the PDP of the present invention.

FIG. 4 is a perspective view of a panel showing a second embodiment of the invention.

FIG. 5 is a perspective view of a panel showing a third embodiment of the present invention.

FIG. 6 is a perspective view of a panel showing a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a panel showing a fifth embodiment of the present invention.

FIG. 8 is a perspective view of a panel showing a sixth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional surface discharge type PDP.

[Explanation of symbols]

1, 2, 11, 12 Glass substrate 3, 13
X electrode (write electrode) 4, 14 Y electrode (scan/sustain electrode) 5, 15 dielectric film 6, 16 phosphor 7, 17 sustain electrode 8 barrier rib

Claims (2)

[Claims] Claim 1: A Y electrode group (scan/sustain electrode group) covered with a dielectric film is provided on a first substrate, and a pair of Y electrodes covered with a dielectric film is provided on a second substrate. A group of X electrodes (a write electrode group and a sustain electrode group) are provided, the first substrate and the second substrate are opposed to each other with a predetermined discharge gap and hermetically sealed, and a In a gas-filled plasma display panel having a substrate structure in which one pixel is composed of three electrodes, the X electrode group or the Y A plasma display panel characterized in that one of the electrode groups has a comb-like electrode shape. 2. A Y electrode group (scan/sustain electrode group) covered with a dielectric film is provided on a first substrate, and a pair of Y electrodes covered with a dielectric film is provided on a second substrate. The X electrode group (
a write electrode group and a sustain electrode group), the first substrate and the second substrate are opposed to each other with a predetermined discharge gap and hermetically sealed, and a rare gas capable of discharging is sealed inside. , in a plasma display panel having a substrate structure in which one pixel is composed of three electrodes, the pair of X electrodes and the Y electrode are parallel to each other within the pixel;
Either one of the electrode group or the Y electrode group is formed into a comb-like electrode shape, and a phosphor is deposited on a portion of the dielectric film formed on the first substrate side along the Y electrode. A plasma display panel characterized by: