JP3207472B2 - Surface discharge type plasma display panel - Google Patents

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 plasma display panel (PDP). Surface discharge type PDP
Has been expanding its use in OA equipment and large-sized public information display devices because of its high brightness and high contrast and easy color display as compared with other flat display devices. . Accordingly, further improvement in display quality and stability of operation are desired.

[0002]

2. Description of the Related Art FIG. 5 is a sectional perspective view showing the structure of a surface discharge type PDP. In FIG. 5, the PDP includes a glass substrate 11 on the display surface H side, a large number of discharge sustaining electrode pairs 12 each of which includes a pair of main discharge electrodes 13 and 14 extending in the lateral direction.
Dielectric layer 17 made of low melting point glass, grid-like partition 1
9, a glass substrate 21 on the back side, address electrodes 22 extending in the vertical direction, parallel-line-shaped partitions 29, and a phosphor 28 of a predetermined emission color.

A portion near the outer periphery of the glass substrates 11 and 21 is sealed with a sealing glass (not shown), thereby forming a discharge space 30 between the glass substrates 11 and 21, for example, a mixture of neon and xenon. Gas is enclosed. On the surface of the dielectric layer 17, M (not shown)
A protective film made of gO is provided.

Each of the discharge sustaining electrode pairs 12, ie, the main discharge electrodes 13 and 14, has a wide transparent electrode 41 provided on the glass substrate 11 and a transparent electrode 41 for supplementing the conductivity of the transparent electrode 41. It has a narrow bus electrode 42 provided thereon.

A discharge cell is defined at each intersection between the discharge sustaining electrode pair 12 and the address electrode 22, and display is performed by selectively discharging each of the discharge cells. Note that each discharge cell is surrounded by a grid-like partition wall 19, and each forms a unit light emitting area EC.

In the display operation by the PDP, first, a discharge starting voltage V is applied between the main discharge electrode 13 and the main discharge electrode 14.
By applying a write pulse (discharge start pulse) exceeding f to start discharge in line units, wall charges are formed on the dielectric layer 17. Next, for each line,
An erase pulse is applied to the address electrodes 22 corresponding to the discharge cells that do not perform display, thereby erasing wall charges and stopping the discharge. In parallel with this, the sustain electrode pair 12
, A sustain pulse having a peak value lower than the discharge starting voltage Vf is applied, and the discharge of the discharge cell corresponding to the display dot is continued by the memory function of the wall charge.

[0007]

As described above, the PDP
The display operation is performed by the discharge start, erasure, and the memory function of the wall charge. To ensure the display operation, a waveform higher than the discharge start voltage Vf of any of the discharge cells is required.
A high-level address pulse is applied to cause all the discharge cells to discharge to form wall charges, and for discharge cells not performing display, the wall charges are sufficiently reduced by an erase pulse, and any discharge is performed. It is necessary to apply a sustain pulse lower than the cell discharge start voltage Vf and higher than the minimum discharge sustain voltage Vs to ensure that the discharge of only the discharge cells corresponding to the display dots is continued.

That is, the peak value of the sustain pulse is lower than the minimum value of the discharge starting voltage Vf and the minimum discharge sustain voltage Vs
Must be higher than the maximum value of. However, since the discharge start voltage Vf and the minimum discharge sustaining voltage Vs change over time, it is necessary to provide a sufficient margin (operation margin) between them at first.

In the prior art, no research has been made on how to obtain an operation margin and increase the operation margin, and it is necessary to start, erase, and maintain the discharge of a discharge cell. It has been difficult to perform this reliably over a long period of time.

The present invention has been made in view of the above-mentioned problems, and has been made in view of the above-described problems. A surface discharge type discharger capable of reliably starting discharge, erasing, and maintaining discharge in a discharge cell for a long time and improving operation stability. It is intended to provide a plasma display panel.

[0011]

Means for Solving the Problems The P according to the first aspect of the present invention.
DP is a discharge space between an address electrodes intersecting the sustain electrode pair in the discharge sustain electrode pairs and unit light emission region composed of a pair of parallel main discharge electrodes, the discharge sustain electrode pairs and the address electrodes A surface discharge type plasma display panel formed, wherein a unit light emitting region is selected.
The line width of the main discharge electrode on the side where selective discharge is performed is
The line width of the main discharge electrode is wider than the line width of the electrode.
Parts not facing the address electrodes and these parts
The line width is large relative to the area of the display area in which the main discharge for display is performed in the planar view area corresponding to the gap between the two.
The ratio of the area of the address area where a face area <br/> selective discharge is performed with had how main discharge electrodes and the address electrodes becomes set in the range of 8 percent to 25 percent.

In the PDP according to the second aspect of the present invention, the interval between the main discharge electrodes is set in a range of 30 μm to 60 μm.

[0013]

[0014]

As the area of the display area ED increases, the wall charges generated in the display area ED also increase, and the address area EA requires a corresponding area to obtain the selective discharge required for erasing the wall charges. . However, if the selective discharge is too strong, the wall charges are re-formed, so that the area of the address area EA has an upper limit.

That is, since these area ratios greatly affect the generation and erasure of wall charges, by setting these area ratios in the range of 8% to 25%, a sufficient operation margin is ensured and the operation is stabilized. Performance can be improved.

By forming the line width W3 of the main discharge electrode 13 wider than the line width W4 of the other main discharge electrode 14,
It is easy to secure a necessary area for the address area EA.

[0017]

FIG. 1 is a plan view schematically showing an electrode structure of a PDP 1 according to the present invention. Since the basic structure of the PDP 1 is the same as that described in FIG. 5, its illustration and description are omitted or simplified.

The PDP 1 has a pair of main discharge electrodes 13 and 14.
And a plurality of pairs of sustaining electrodes 12 which are parallel to each other and an address electrode 22 which is orthogonal to each pair of sustaining electrodes 12.
A discharge cell is defined at each intersection with 2.
Each of these discharge cells is surrounded by a grid-like partition wall 19, and each forms a unit light emitting area EC. Each unit light emitting area EC has a square shape with a side of about 700 to 800 μm.

Each of the main discharge electrodes 13 and 14 comprises a transparent electrode (display electrode) 41 and a bus electrode (metal electrode) 42. The transparent electrode 41 has a thickness of, for example, 800 mm.
The bus electrode 42 is formed by, for example, sequentially depositing chromium, copper, and chromium by sputtering deposition, and forming a thin metal film (about 1.2 μm thick) by photolithography. Formed by patterning.

Main discharge electrode 13 on the side where selective discharge is performed
Are formed so that the line width W3 is wider than the line width W4 of the other main discharge electrode 14, for example, such that their ratio becomes 2: 1. This makes it easy to secure a necessary area for the address area EA described later.

The distance between the main discharge electrodes 13 and 14 (inter-electrode distance) is set to about 50 μm. The distance between the electrodes may be in the range of 30 μm to 60 μm. In each unit light emitting region EC, a display region ED in which a main discharge for display is performed between the main discharge electrodes 13 and 14 and a unit light emitting region in a portion where the main discharge electrode 13 and the address electrode 22 face each other. An address area EA in which a selective discharge for selecting an EC is performed is formed. The ratio of the area of the address area EA to the area of the display area ED is set to about 15%. The ratio of the area is 8% to 2%.
The range may be 5%.

The PDP 1 configured as described above is driven by repeatedly applying a pulse voltage having a waveform as shown in FIG. That is, a negative sustain pulse Vst is alternately applied to each of the main discharge electrodes 13 and 14, and
, A positive address pulse Vw is applied in synchronization with the sustain pulse Vs of the other main discharge electrode 14, and an erase pulse Va is applied to the address electrode 22 corresponding to a discharge cell that does not perform display.

FIG. 3 is a diagram showing the relationship between the area ratio between the display area ED and the address area EA and the operation margin. In FIG. 3, the operation margin is shown with the value at the time when it is the maximum as 1.

According to FIG. 3, the maximum operation margin is obtained when the area ratio of the address area EA to the display area ED is about 15%, and when the area ratio decreases to about 8% or increases to about 25%, respectively. The operation margin is about 0.2. So if it is between 8% and 25%,
Since it can be said that there is a sufficient operation margin, a stable operation can be obtained for a long time.

The reason why the operation margin depends on the area ratio between the display area ED and the address area EA is considered as follows. That is, as the area of the discharge increases, the discharge increases, and the wall charges generated thereby also increase. Therefore, as the area of the display area ED increases, the wall charges generated in the display area ED also increase, and the address area EA requires a correspondingly large area in order to obtain a selective discharge required for erasing the wall charges. However, if the selective discharge is too strong, the wall charges are re-formed, so that the area of the address area EA has an upper limit.

As described above, since these area ratios greatly affect the generation and erasure of wall charges, a sufficient operation margin is secured by optimizing these area ratios, and the operation stability is improved. You can do it.

FIG. 4 is a diagram showing the relationship between the interval between the main discharge electrodes 13 and 14 (distance between the electrodes) and the operation margin and luminous efficiency. In FIG. 4, the operating margin and the luminous efficiency are shown with the value when they are the maximum as 1.

According to FIG. 4, the luminous efficiency increases as the distance between the electrodes increases, but when the distance between the electrodes exceeds 60 μm, the operation margin sharply decreases. That is, a sufficient operation margin is obtained when the distance between the electrodes is in the range of 30 μm to 60 μm, and the operation margin is maximized when the distance is 50 μm.

Therefore, considering the operation margin and the luminous efficiency, the optimum value of the distance between the electrodes is 30 μm to 60 μm.
m is in the range of m. As described above, since the inter-electrode distance between the main discharge electrodes 13 and 14 has a great influence on the discharge characteristics, the luminous efficiency is improved by optimizing the inter-electrode distance, and the luminance and power consumption are improved. PDP
1 can improve the stability of operation and the yield.

[0030]

According to the present invention, the discharge start of the discharge cell,
Erasure and maintenance of discharge can be reliably performed for a long time, and operation stability can be improved. Further, it is easy to secure a necessary area for the address area.

According to the second aspect of the present invention, the luminous efficiency can be improved, and the luminance and the power consumption can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an electrode structure of a PDP according to the present invention.

FIG. 2 is a diagram illustrating an example of a waveform of a pulse voltage applied to a PDP according to the present invention.

FIG. 3 is a diagram showing a relationship between an area ratio between a display region and an address region and an operation margin.

FIG. 4 is a diagram showing a relationship between an interval between main discharge electrodes, an operation margin, and luminous efficiency.

FIG. 5 is a sectional perspective view showing the structure of a surface discharge type PDP.

[Explanation of symbols]

 Reference Signs List 1 PDP (plasma display panel) 12 discharge sustaining electrode pair 13 main discharge electrode 14 main discharge electrode 22 address electrode EC unit light emitting area ED display area EA address area W3, W4 Line width

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masato Suzuki 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Co., Ltd. 72) Inventor Teruo Kurai 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-61-259437 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) H01J 11/00-11/02

Claims (2)

(57) [Claims] 1. A has an address electrodes intersecting the sustain electrode pair in the discharge sustain electrode pairs and unit light emission region composed of a pair of parallel main discharge electrodes, the discharge between the sustain electrode pairs and the address electrodes A surface discharge type plasma display panel in which a space is formed, and a main discharge side on which a selective discharge for selecting a unit light emitting region is performed.
The line width of the discharge electrode is set wider than the line width of the other main discharge electrode.
And in the unit light emitting region, the pair of main discharge electrodes
A portion of each of them not facing the address electrode and
Area corresponding to the gap between these parts
To the area of the display area where the main discharge for display takes place.
Between the main discharge electrode and address electrode with the larger line width
A surface discharge type plasma display panel characterized in that a ratio of an area of an address area in which selective discharge is performed is set in a range of 8% to 25%. 2. The distance between said main discharge electrodes is 30 μm to 6 μm.
2. The method according to claim 1, wherein the distance is set in a range of 0 .mu.m.
1 Symbol mounting surface discharge type plasma display panel.