JPH09231907A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the lifetime by reducing the concentrated discharge, and to realize a high luminance display. SOLUTION: This plasma display panel 1 includes several first sustain electrodes X and several second sustain electrodes Y which are arranged in a display screen SC along a row direction MC, and also includes several, address electrodes A which are arranged along a line direction ML. In this case, the two second sustain electrodes Y are respectively arranged in arrangement interstices between the first sustain electrodes X, and a discharge gap G extending in a direction intersecting the line direction MC is formed in each of an unit luminescent region EU so that the sustain discharge is produced between the first sustain electrode X and the second sustain electrode Y adjacent thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matrix display type AC PD having an electrode pair defining a surface discharge cell.
P (plasma display panel).

Among AC drive type PDPs that utilize wall charges for selective light emission, surface discharge type PDPs are particularly suitable for color display by phosphors and are attracting attention as large screen display devices for high-definition.

[0003]

2. Description of the Related Art FIG. 5 is a plan view schematically showing an electrode structure of a conventional surface discharge PDP 80, and FIG. 6 is a conventional surface discharge PD.
It is a disassembled perspective view which shows the internal structure of P80.

The PDP 80 has a plurality of electrode pairs 12j composed of linear sustain electrodes (main electrodes) Xj, Yj extending in parallel with each other and a plurality of linear address electrodes Aj orthogonal to the sustain electrodes Xj, Yj. . Each electrode pair 12j corresponds to one line (row) L of matrix display,
Each address electrode Aj corresponds to one column.

The sustain electrodes Xj and Yj are connected to each line L.
In, the electrodes are alternately arranged in the column direction so as to be adjacent to each other across the surface discharge gap G. However, the electrode spacing d between the lines is the gap width (inter-electrode distance) g of the surface discharge gap G.
It is sufficiently larger than w.

The sustain electrodes X arranged in this way
One of the sustain electrodes Xj of j and Yj is electrically shared by the plurality of lines L to simplify the drive circuit. The other sustain electrode Yj is an individual electrode that is independent for each line in order to enable line-sequential screen scanning. In each line L, the sub-pixels (unit light emitting area) EU are formed by the sustain electrodes Xj and Yj.
A surface discharge cell Cj is defined for each. Then, lighting (discharging) or non-lighting selection (addressing) of each surface discharge cell Cj is performed by the discharge between the sustain electrode Yj and the address electrode Aj.

In using the PDP 80, after addressing according to the display content, a sustain pulse is applied alternately to the sustain electrodes Xj and Yj for all the lines L simultaneously. That is, AC drive is performed. The relative potential relationship between the sustain electrode Xj and the sustain electrode Yj is inverted every time the sustain pulse is applied. If the peak value (Vs) of the sustain pulse is set lower than the discharge start voltage (Vf), a surface discharge is generated every time the sustain pulse is applied in the surface discharge cell Cj in which a predetermined amount of wall charges existed at the end of addressing. . The display brightness can be adjusted by appropriately setting the number of times the sustain pulse is applied per unit time.

In FIG. 6, the PDP 80 includes a front glass substrate 11j, sustain electrodes Xj and Yj, a dielectric layer 17j for AC driving, a protective film 18j, a rear glass substrate 21j, address electrodes Aj, and a plan view. It is composed of a linear partition 29j and a phosphor layer 28j for full-color display. The internal discharge space 30j is formed in the line direction (the sustain electrodes Xj, Yj by the partition 29j).
Of the sub-pixel EU, and the gap dimension thereof is defined. The arrangement pattern of the barrier ribs 29j is a so-called stripe pattern, and the discharge space 30
The part of j corresponding to each column is continuous in the column direction across all the lines L.

The sustain electrodes Xj and Yj are arranged on the inner surface of the glass substrate 11j, and each of them comprises a wide transparent conductive film 41 and a metal film 42 for ensuring conductivity. The transparent conductive film 41 is patterned in a band shape wider than the metal film 42 so as to spread the surface discharge.

The phosphor layer 28j includes a sustain electrode Xj,
It is provided between the partitions 29j on the glass substrate 21j on the back side in order to reduce the ion bombardment due to the surface discharge away from Yj, and locally excited by the ultraviolet rays generated by the surface discharge to emit light. Of the visible light emitted on the surface of the phosphor layer 28j (the surface in contact with the discharge space), the glass substrate 1
The light passing through 1j becomes the display light.

Matrix display pixels EG
Is composed of three sub-pixels EU arranged in the line direction. These emission colors (R, G, B) are different from each other,
Color display is performed by combining G and B. The shape of the pixel EG is preferably a square in terms of image reproduction. When the pixel EG is a square, the subpixel E
U is a rectangle that is long in the column direction.

[0012]

In the conventional electrode structure,
Since the surface discharge gap Gj extends in the line direction and the gap length (length in the line direction) gl of the surface discharge gap Gj in each sub-pixel EU is short, the surface discharge is excessively concentrated and the protective film against ion bombardment is formed. There is a problem that deterioration of 18j is likely to proceed. The gap length gl is the partition wall 2
It is shorter than the dimension of the sub-pixel EU in the line direction by the width of 9j.

Further, the intensity of the ultraviolet rays depends on the surface discharge gap Gj.
Since it becomes smaller as the distance from the phosphor layer 2 increases,
The excitation of 8j was limited to the central portion in the column direction in the sub-pixel EU. That is, there is also a problem that the non-luminous region occupies a large proportion in the sub-pixel EU and the luminous efficiency is low.

It is an object of the present invention to alleviate the concentration of discharge to extend the life and to increase the brightness of the display.

[0015]

When the gap length gl is increased, the concentration of discharge is reduced and the effective light emitting area is expanded. As described above, when the unit light emitting region (sub-pixel EU in the PDP 80) is long in the column direction, the gap length gl can be increased by providing the surface discharge gap extending in the column direction instead of the line direction. That is, each sustain electrode may be formed in a comb shape so that the comb teeth of one sustain electrode and the comb teeth of the other sustain electrode are adjacent to each other with a gap width gw in each unit light emitting region. However, if the arrangement order of the sustain electrodes in the column direction is the same as the conventional order (one by one),
Since the electrode interval d must be made sufficiently large in order to avoid the discharge due to the sustain pulse between the adjacent lines L, it is not possible to expect a large increase in the gap length gl.
It is necessary to devise the arrangement order.

In the PDP of the invention of claim 1, a plurality of first sustain electrodes and a plurality of second sustain electrodes are arranged in the display screen along the column direction.
A matrix display type PDP in which sustain electrodes are arranged and a plurality of address electrodes are arranged in the row direction, and two second sustain electrodes are arranged in each gap between the first sustain electrodes. , Adjacent first
A discharge gap extending in a direction intersecting the row direction is formed in each unit light emitting region so that a sustain discharge is generated between the sustain electrode and the second sustain electrode.

In the PDP of the second aspect of the present invention, each of the first sustain electrodes and each of the second sustain electrodes has a strip-shaped base portion extending in the row direction over the entire length of the display screen, and the column from the base portion. A plurality of branch portions projecting in the direction, and the branch portions of the first sustain electrode are alternately arranged on the one side and the other side of the base portion in the column direction for each of the unit light emitting regions. And the first
The discharge gap is formed by the branch portion of the sustain electrode and the branch portion of the second sustain electrode.

According to a third aspect of the PDP of the present invention, the branch portion of each of the first sustain electrodes and the second sustain electrodes has a small width portion which is continuous with the base portion corresponding to the branch portion.
The enlarged portion of the first sustain electrode and the enlarged portion of the second sustain electrode, which are formed on both sides in the row direction with respect to the narrow portion and are apart from the base portion. A discharge gap is formed.

The term "corresponding base portion" as used herein means the base portion of the first sustain electrode (or second sustain electrode) to which the branch of interest belongs. PD of the invention of claim 4
P is such that the address electrode passes through all of the unit light emitting regions arranged in the column direction, overlaps with the branch portion of the second sustain electrode in each unit light emitting region in plan view, and It is patterned in a meandering band shape so as not to overlap the branch portion.

In the PDP of the fifth aspect of the present invention, each of the discharge gaps extends in a direction inclined with respect to both the column direction and the row direction. Each first sustain electrode is commonly used for displaying two adjacent rows. However, if it is at both ends of the electrode array, it is used to display one line. Each second sustain electrode is used to display one line.

The first electrode of the array of electrodes in the column direction is the first
It may be the sustain electrode or the second sustain electrode. For example, when the first sustain electrode is the first electrode,
The arrangement order of the first sustain electrode (represented by “X”) and the second sustain electrode (represented by “Y”) is as follows.

X, Y, Y, X, Y, Y, X ... X, Y X, Y, Y, X, Y, Y, X ... X, Y, Y, X

[0023]

1 is a plan view showing a basic structure of an electrode matrix of a PDP 1 according to the present invention. PDP1
It is a surface discharge type PDP of a matrix display type, and includes a plurality of electrode pairs 12 formed of sustain electrodes X and Y extending in a line direction ML and a plurality of address electrodes A extending in a column direction MC.
And The display screen SC has sub-pixels E arranged vertically and horizontally.
Consists of U. In the figure, the number of sub-pixels is 5 × 4, but in reality, for example, in the case of a 42-inch size, 1920
(= 640 × 3) × 480 or so.

The arrangement order of the sustain electrodes X and Y is such that the arrangement of Y, X and Y is repeated unlike the conventional case. The sustain electrodes Y are arranged on both sides of the sustain electrode X,
Two sustain electrodes Y are arranged adjacent to each other between the sustain electrodes X. The arrangement interval e of the two sustain electrodes Y sandwiched by the sustain electrodes X (see FIG. 2A) may be a minimum value (for example, 20 to 30 μm) that can electrically separate these electrodes, It is sufficiently smaller than the length of the sub-pixel EU in the column direction MC (for example, 600 μm). Each electrode pair 12 corresponds to one line L of matrix display. However, the sustain electrode X is shared for displaying two adjacent lines L. That is, the sustain electrodes X are the sustain electrodes Y on one side in the column direction MC.
One electrode pair 12 is configured with the other, and another electrode pair 12 is configured with the sustain electrode Y on the other side. The surface discharge cells C are defined in the line L for each sub-pixel EU by each electrode pair 12. Each address electrode A corresponds to one column.

The sustain electrodes X and Y are not linear,
It has a branch portion 52 extending in the column direction MC. The branch portion 52 of the sustain electrode X has a column direction MC for each sub-pixel EU.
They are alternately arranged on one side and the other side. The sustain electrode Y has a comb shape having a branch portion 52 on one side in the column direction MC. The branch portion 52 of the sustain electrode Y is arranged at an intermediate position between the branch portions 52 of the sustain electrode X. P
In DP1, the branch portion 52 of the sustain electrode X and the branch portion 52 of the sustain electrode Y form one surface discharge gap G in each sub-pixel EU. The address electrode A is also not linear, but is patterned in a meandering band shape that passes through a position closer to the branch portion 52 side of the sustain electrode Y from the center in the line direction ML in each sub-pixel EU. By the meandering, it is possible to reduce the electrostatic capacitance between the address electrodes while ensuring the discharge area (the facing area of the address electrode A and the sustain electrode Y) necessary for addressing.

When driving, each sustain electrode X
Are electrically shared. On the other hand, each sustain electrode Y is treated as an individual electrode (so-called scan electrode) when line-sequential addressing is performed. In the sustain period, the sustain pulse is simultaneously applied to all the sustain electrodes Y.

FIG. 2 is an enlarged view of a main part of the sustain electrodes X and Y. FIG. 2A shows the planar shape of the branch portion 52.
(B) shows the structure of the branch portion 52. As shown in FIG. 2A, the sustain electrode X includes a strip-shaped base portion 51 extending in the row direction over the entire length of the display screen, and a plurality of branch portions 52 extending from the base portion 51 in the column direction. . Similarly, the sustain electrode Y is also composed of a base portion 51 and a plurality of branch portions 52. In the following description, the sustain electrode X and the sustain electrode Y are not distinguished from each other in terms of the electrode configuration unless otherwise necessary.

Each branch 52 is a base 5 of the electrode to which it belongs.
The narrow width portion 61 is in contact with the narrow width portion 1, and the enlarged width portion 62 is formed on both sides of the narrow width portion 61 in the row direction.
The enlarged portion 62 is separated from the base portion 51 of the electrode to which it belongs by the length k in the column direction of the small width portion 61, and the base portion 5 of the other electrode is separated.
It is separated from 1 by a length f. In the example of FIG. 2, the length f is equal to the length k.

The surface discharge gap G is formed by the enlarged portion 62 of the sustain electrode X and the enlarged portion 62 of the sustain electrode Y. That is, the gap between the adjacent enlarged portions 62 is the gap width gw, and the length of the enlarged portions 62 in the column direction is the gap length gl. By providing the narrow portion 61,
Since the distance of the surface discharge gap G between the lines increases by twice the length k, the coupling of discharges in the column direction is less likely to occur.

As shown in FIG. 2B, the branch portion 52 has a base portion 5
The metal film 412 is formed at the same time as 1 and the transparent conductive film 420 that forms the enlarged portion 62 and has a quadrangular shape in plan view. The metal film 412 extends from the root of the branch portion 52 to the vicinity of the tip, and a part thereof overlaps with the transparent conductive film 420. A portion of the metal film 412 that does not overlap the transparent conductive film 420 corresponds to the small width portion 61.

FIG. 3 is a sectional view of the main part of the PDP 1.
5 shows a cross-sectional structure taken along line VV of FIG. In FIG. 3, the PDP 1 is an AC drive type surface discharge PDP which is called a reflection type because of the arrangement form of the phosphors like the conventional PDP 80. Sustain electrodes X and Y are arranged on the inner surface of the front glass substrate 11, and a dielectric layer 17 is provided so as to cover the sustain electrodes X and Y with respect to the discharge space 30. On the surface of the dielectric layer 17, a protective film 18 made of MgO is deposited. Both the dielectric layer 17 and the protective film 18 have translucency. The sustain electrodes X and Y are composed of a transparent electrode 41 and a metal electrode 42.

On the inner surface of the glass substrate 21 on the back surface side, a partition 29 having a linear shape in a plan view is provided so as to overlap with the metal film 412 in each of the sustain electrodes X and Y. The discharge space 30 is formed by the barrier ribs 29 in the line direction ML in the sub-pixel EU.
And the gap size of the discharge space 30 is 150μ.
It is regulated to about m. The width of the partition 29 is 412
Is almost equal to the width of. The above-mentioned address electrodes A are arranged one by one between the respective partition walls 29. Each address electrode A is
Each sub-pixel EU is patterned so as to overlap the transparent conductive film 420 of the sustain electrode Y and not to overlap the transparent conductive film 420 of the sustain electrode Y.
As a result, the reliability of the addressing for controlling the wall charges by causing discharge (counter discharge) between the address electrode A and the sustain electrode Y is enhanced.

Phosphor layers 28R, 28G, 28B of three colors of R, G, B for color display are provided so as to cover the wall surface on the back side including the surface of the address electrode A. In the PDP 1, stripe-shaped partition walls 29
Is provided, crosstalk between the sub-pixels EU is surely prevented in full-color display by the combination of R, G, and B. However, the sustain electrode X,
Unlike the case where Y is linear, since the surface discharge cell C (see FIG. 1) is defined by the branch portion 52, it is possible to omit the partition wall 29 and simplify the internal structure. When omitting the barrier ribs 29, spacers are scattered to form the discharge space 30.
Specifies the gap size of

FIG. 4 is a plan view showing a modified example of the sustain electrode structure. In FIG. 4, the sustain electrodes X, Y
The branch portion 52b of the linear metal film 4 extending in the column direction MC.
12 and a trapezoidal transparent conductive film 421.
The surface discharge gap Gb is a facing gap between the hypotenuses of the adjacent transparent conductive films 421. In this case, since the extension direction of the surface discharge gap Gb is a direction inclined with respect to the column direction MC, the gap length g is larger than that in the column direction MC.
l is long.

In the above-described embodiment, the branch portions 52 and 52b of the sustain electrode X are also the branch portions 5 of the sustain electrode Y.
2, 52b are also arranged in a zigzag pattern along the column direction MC. Therefore, as compared with the case where they are aligned on a straight line, the gap between the branch portions 52 and 52b of the same polarity at the time of sustain increases, so that discharge coupling in the column direction MC is less likely to occur. However,
The electrode structure is not limited to the illustrated example, and the sustain electrode X may have, for example, a fish-bone shape, that is, a shape in which the branch portions 52 and 52b project to both sides in the column direction MC at the same position in the line direction ML. In that case, it is desirable to provide a partition wall extending in the column direction MC so as to overlap the base portion 51 of the sustain electrode X to prevent discharge coupling between the lines sandwiching the sustain electrode X. Alternatively, the branch portions 52 and 52b may be formed of only the transparent conductive material without providing the metal film 412.

[0036]

According to the first to fifth aspects of the present invention,
It is possible to alleviate the concentration of discharge and prolong the life, and it is possible to realize high-brightness display by a driving sequence similar to the conventional one.

According to the second aspect of the present invention, the distance between the sustain electrodes of the same polarity between the two discharge gaps adjacent in the column direction increases, so that the discharge coupling in the column direction can be prevented.

According to the third aspect of the present invention, the distance between adjacent discharge gaps in the column direction increases, so that coupling of discharges in the column direction can be prevented more reliably. According to the invention of claim 4, the electrostatic capacitance between the address electrodes can be reduced and the driving can be facilitated.

According to the invention of claim 5, the discharge gap can be made longer in the unit light emitting region having a limited area, and the brightness can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a basic structure of an electrode matrix of a PDP of the present invention.

FIG. 2 is an enlarged view of a main part of a sustain electrode.

FIG. 3 is a sectional view of a main part of a PDP.

FIG. 4 is a plan view showing a modified example of the sustain electrode structure.

FIG. 5 is a plan view schematically showing an electrode structure of a conventional surface discharge PDP.

FIG. 6 is an exploded perspective view showing an internal structure of a conventional surface discharge PDP.

[Explanation of symbols]

 1 PDP (Plasma Display Panel) 51 Base 52 Branch 61 Small Width 62 Enlarged Area A Address Electrode EU Sub Pixel (Unit Light Emitting Area) G Surface Discharge Gap (Discharge Gap) MC Column Direction SC Display Screen X Sustain Electrode (First) Sustain electrode) Y sustain electrode (second sustain electrode)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadayoshi Kosaka 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Keiichi Bei, 1015, Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture Fujitsu Limited

Claims (5)

[Claims] 1. A plasma of a matrix display type in which a plurality of first sustain electrodes and a plurality of second sustain electrodes are arranged in a column direction in a display screen, and a plurality of address electrodes are arranged in a row direction. In the display panel, two second sustain electrodes are arranged in a gap between the first sustain electrodes so that a sustain discharge is generated between the adjacent first sustain electrode and second sustain electrode. A plasma display panel, wherein a discharge gap extending in a direction intersecting the row direction is formed for each unit light emitting region. 2. The first sustain electrodes and the second sustain electrodes
The sustain electrode is composed of a strip-shaped base portion extending in the row direction over the entire length of the display screen, and a plurality of branch portions protruding from the base portion in the column direction, and each branch portion of the first sustain electrode. Are arranged alternately on the one side and the other side of the base portion in the column direction for each of the unit light emitting regions, and the branch portion of the first sustain electrode and the branch portion of the second sustain electrode. The plasma display panel according to claim 1, wherein the discharge gap is formed by. 3. The first sustain electrodes and the second sustain electrodes
The branch portion of the sustain electrode is composed of a narrow portion that is continuous with the base portion corresponding to the branch portion, and an enlarged portion that extends to both sides in the row direction with respect to the narrow portion and that is apart from the base portion. 3. The plasma display panel according to claim 2, wherein the discharge gap is formed by the enlarged portion of the first sustain electrode and the enlarged portion of the second sustain electrode. 4. The address electrode passes through all of the unit light emitting regions arranged in the column direction, overlaps with the branch portion of the second sustain electrode in each of the unit light emitting regions in plan view, and has the first sustain. The electrode is patterned in a meandering strip shape so as not to overlap with the branch portion of the electrode.
The plasma display panel described. 5. The plasma display panel according to claim 1, wherein each of the discharge gaps extends in a direction inclined with respect to both the column direction and the row direction.