JPH0765728A - Surface discharge type plasma display panel and drive method therefor - Google Patents

Abstract

PURPOSE:To enhance surface discharge intensity in the vicinity of a division, and ensure high display brightness by forming the metallic film of one of display electrodes as a pair formed out of a transparent conductive film and a metallic film in such a way as projected toward the other display electrode at the intersection hereof with the division. CONSTITUTION:This display panel has a pair of surface discharge display electrodes X and Y formed out of a transparent conductive film 41 and a metallic film 42 superposed thereon on a display side substrate, while stripe type divisions 29 are provided on a reverse side substrate for dividing discharge space into unit luminous zones. The film 42 of one electrode X is formed so as to project toward the other electrode Y at the intersection thereof with the divisions 29 relative to other areas. The film of the other electrode Y is made linear in parallel to the conductive film 41. According to this construction, conductivity in the vicinity of the divisions 29 is increased, and intense surface discharge takes place in the neighborhood. As a result, the range of intense discharge within the unit luminous zones is expanded to increase brightness.

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 surface discharge type plasma display panel (PDP) and a driving method thereof.

A surface discharge type PDP suitable for color display by a phosphor has been attracting attention as a display device replacing a CRT, and its application is expanding to the field of high-definition video.

[0003]

2. Description of the Related Art Here, a structure of a conventional surface discharge PDP will be described with reference to FIG. 1 showing an embodiment of the present invention.

In general, a matrix display type surface discharge type P
DP is a glass substrate 11 on the display surface H side, a pair of display electrodes X and Y for surface discharge corresponding to each display line, a dielectric layer 17 covering the display electrodes X and Y, a protective film 18, a back surface side. Glass substrate 21, address electrodes A orthogonal to the display electrodes X and Y, and stripe-shaped partition walls 2 parallel to the address electrodes A.
9 and a phosphor 28 having a predetermined emission color.

The internal discharge space 30 is divided by the barrier ribs 29 in the unit light emitting region EU in the extension direction (line direction) of the display electrodes X and Y, and the gap dimension between the barrier ribs 29 and the dielectric layer 17 corresponds. It is regulated to about 100 to 150 μm by contact.

The phosphor 28 is formed on the glass substrate 2 on the side opposite to the display electrodes X and Y in order to avoid ion bombardment due to surface discharge.
It is provided between the barrier ribs 29 on the upper part 1 and is excited by the ultraviolet rays emitted by the discharge gas during surface discharge to emit light. Phosphor 28
The light emitted on the surface layer surface (surface contacting the discharge space) of (1) passes through the dielectric layer 17 and the glass substrate 11 and is emitted to the outside.

In the display, first, for example, as writing on the entire display surface H, a voltage exceeding the discharge start voltage is applied to one display electrode X for all the lines in each unit light emitting area EU in each line. Simultaneous surface discharge (dielectric layer 1
Discharge in the surface direction 7). When the surface discharge occurs, wall charges having a polarity opposite to the applied voltage are accumulated in the dielectric layer 17 on each display electrode X, Y. Next, in a state where a discharge sustaining voltage lower than the discharge starting voltage is applied to the other display electrode Y,
A predetermined voltage is applied to the address electrode A selected according to the display pattern to generate the address discharge between the display electrode Y and the address electrode A. An appropriate charge storage state is formed by the address discharge.

After that, the discharge sustaining voltage is alternately applied to the display electrodes X and Y of each line. As a result, strong light emission occurs each time the discharge sustaining voltage is applied in the unit light emitting region EU in which a predetermined amount of wall charges are accumulated. At this time, the brightness is adjusted by appropriately selecting the application period of the discharge sustaining voltage.

Now, a so-called reflection type P in which a phosphor 28 for defining a display color is arranged on the glass substrate 21 on the back side
In DP, it is necessary to minimize the blocking of display light by the display electrodes X and Y.

FIG. 3 shows the display electrodes X and Y of the conventional PDP 1j.
2 is a plan view showing the configuration of FIG. In the conventional PDP 1j, the display electrodes X and Y are composed of a wide band-shaped transparent conductive film 41 for widening the surface discharge, and a narrow linear metal film (bus electrode) stacked on the outer end side thereof. ) 42j. Since the transparent conductive film 41 has a relatively high resistance, the metal film 42j is provided to supplement the conductivity of the display electrodes X and Y in the line direction.

[0011]

Conventionally, since the movement of ions is suppressed by the partition walls 29, the surface discharges at both end portions of each unit light emitting region EU in the line direction are weaker than those at the central portion, and the unit light emitting region EU is weak. However, there is a problem that the luminous efficiency is low.

In view of the above problems, it is an object of the present invention to increase the intensity of surface discharge in the vicinity of the barrier ribs and increase the brightness of the display.

[0013]

[Means for Solving the Problems] P according to the invention of claim 1
In order to solve the above-mentioned problems, the DP has a transparent conductive film 41 on the substrate 11 on the display surface H side, as shown in FIGS. 1 and 2.
And a pair of display electrodes X and Y for surface discharge composed of a metal film 42 that overlaps with the above, and stripe-shaped barrier ribs 29 that partition the discharge space 30 into unit light emitting regions EU on the substrate 21 on the back side. Surface discharge type plasma display panel 1
And the metal film 42 of the one display electrode X is
The metal film 42 of the other display electrode Y is formed so as to project the intersection with the partition 29 toward the other display electrode Y with respect to the other portion, and the metal film 42 of the other display electrode Y is formed.
It is formed by being formed in a straight line parallel to 1.

In the driving method according to the second aspect of the present invention, each unit light emitting region is selectively caused to emit light between the other display electrode Y and the address electrode A arranged in parallel with the partition 29. The above-mentioned address discharge is generated.

[0015]

In the display electrode X, by projecting the intersection of the metal film 42 with the partition 29, the conductivity in the vicinity of the partition 29 is increased, and a strong surface discharge is generated at that portion.
For this reason, the range in which the strong discharge occurs in the unit light emitting region EU is wide, and the brightness is increased.

[0016]

1 is an exploded perspective view showing a basic structure of a portion corresponding to one pixel EG of a PDP 1 according to the present invention, and FIG. 2 is a plan view showing a structure of a display electrode of the PDP 1 of FIG.

In these figures, the PDP 1 has a three-electrode structure in which a pair of display electrodes X, Y and an address electrode A correspond to each other in a unit light emitting region EU of matrix display, and is classified according to the arrangement form of phosphors. It is a surface discharge type PDP called as a reflection type.

The display electrodes X and Y for surface discharge are provided on the glass substrate 11 on the display surface H side, and are covered in the discharge space 30 by a dielectric layer 17 for AC driving. Thousands of Å as a protective film on the surface of the dielectric layer 17
The MgO film 18 having a thickness of about 3 is provided.

On the other hand, the address electrode A for selectively emitting light in the unit light emitting region EU is provided with the glass substrate 21 on the back side.
The display electrodes X and Y are arranged on the display electrode at a pitch of, for example, about 200 μm.
It is arranged so that it is orthogonal to.

A discharge space 30 is provided between each address electrode A.
Striped barrier ribs 29 having a width of about 50 μm that define the gap size of the discharge space 3 are provided.
0 is divided for each unit light emitting area EU in the line direction (extension direction of the display electrodes X and Y). In addition, the glass substrate 21
Covers the upper surface of the address electrode A and the inner surface of the rear surface including the side surface of the partition 29 so that R (red), G
Phosphors 28 of three primary colors of (green) and B (blue) are provided. The alphabets R, G, and B in the figure indicate the emission colors of the phosphors 28. The discharge space 30 is filled with Penning gas, which is a mixture of neon and xenon, as a discharge gas for exciting the phosphor 28 with ultraviolet rays.

Each pixel (dot) EG constituting the display screen
Are associated with three unit light emitting regions EU having the same area and arranged in the line direction. In each unit light emitting region EU, a surface discharge cell (main discharge cell for display) C1 is defined by the display electrodes X and Y, and an address discharge for selecting display or non-display by the display electrode Y and the address electrode A. Cell C2 is defined. As a result, of the phosphors 28 that are continuous in the vertical direction of FIG. 1, a portion corresponding to each unit light emitting region EU can be selectively caused to emit light, and R, G, and
Full color display is possible by the combination of B.

Since the display electrodes X and Y are arranged on the display surface H side with respect to the discharge space 30 as described above, each of them is composed of the transparent conductive film 41 and the metal film 42 which complements the conductivity. Has been done. The transparent conductive film 41 is 2000
Å It consists of a Nesa film (tin oxide film) with a thickness of about 4
Reference numeral 2 is, for example, a thin film having a thickness of about 1 μm and having a three-layer structure of chromium-copper-chrome.

As shown in FIG. 2, the transparent conductive film 4
The planar shape of No. 1 is a strip with a uniform width of about 180 μm, and is the same for the display electrodes X and Y. On the other hand, the planar shape of the metal film 42 is the same as that of the address discharge cell C.
The display electrode Y that defines 2 is formed into a strip shape (straight line shape) having a uniform width of about 80 μm that overlaps the outer end portion of the transparent conductive film 41, and the display electrode X used only for surface discharge is formed with the partition 29. The intersection of the display electrode Y with respect to the other part
It is shaped so as to project toward.

That is, the metal film 42 of the display electrode X is a protrusion provided at the intersection of the partition wall 29 and the linear portion 42A having a uniform width of about 50 to 70 μm which overlaps the outer end portion of the transparent conductive film 41. And part 42B. The width of the protrusion 42B is
The width is selected to be equal to or smaller than the width of the partition wall 29 so as not to impair the aperture ratio, which is the ratio of the translucent portion in the unit light emitting region EU. Further, the length of the protruding portion 42B is selected so that the leading edge thereof matches the inner edge of the transparent conductive film 41.

Such a metal film 42 is formed on the glass substrate 11
By patterning the Nesa film provided on the transparent conductive film 4
After 1 is formed, a thin film that uniformly covers the glass substrate 11 including the transparent conductive film 41 is formed by vapor deposition, sputtering, or the like, and the thin film is collectively patterned for the display electrodes X and Y using the photolithography method. Can be formed by

When using the PDP 1 having the above configuration,
As in the conventional case, a write voltage is applied to one of the display electrodes X to generate surface discharge on the entire display surface H, and an address discharge is selectively generated between the display electrode Y and the address electrode A to form a display pattern. Then, the sustain voltage is alternately applied to the display electrodes X and Y for a certain period thereafter to maintain the display state of one pattern. Then, such an operation is repeated to display a moving image or the like.

In the display period holding period (discharge maintaining period), the conductivity of the display electrode X in the vicinity of the partition wall 29 increases due to the presence of the protruding portion 42B, so that even in the vicinity of the partition wall 29 in which the movement of ions is suppressed, the unit. Similar to the central portion of the light emitting region EU, strong surface discharge occurs. For this reason, the range in which the strong discharge occurs in the unit light emitting region EU is wide, and the display brightness is increased.

As with the display electrode X, it is conceivable to cause the metal film 42 to partially protrude in the display electrode Y to facilitate surface discharge. However, in that case, the address discharge, which should originally occur at the facing portion between the display electrode Y and the address electrode A, occurs between the protruding portion of the metal film 42 of the display electrode Y and the address electrode A, and the partition 2
9 due to the variation in height of the dielectric layer 17 and the partition 29.
If there is a gap between the two, the address discharge may unnecessarily spread to the adjacent unit light emitting region EU through the gap. If the discharge spreads unnecessarily, the displayed contents will be disturbed. Therefore, regarding the display electrode Y, in order to ensure selective light emission of the unit light emitting area EU, it is desirable that the metal film 42 be linear.

According to the above-described embodiment, since the width of the protruding portion 42B of the metal film 42 is equal to or smaller than that of the partition 29, the aperture ratio of the unit light emitting region EU is not deteriorated and the protruding portion 4 is not damaged.
Increasing the intensity of surface discharge by providing 2B is more effective in achieving higher brightness.

In the above-described embodiment, the length of the protruding portion 42B is such that the leading edge thereof does not project to the display electrode Y side with respect to the inner edge of the transparent conductive film 41, that is, the maximum width of the metal film 42 is transparent. The width can be appropriately selected according to the size of the unit light emitting region EU, driving conditions, etc. within a range that does not exceed the width of the conductive film 41.

[0031]

According to the present invention, it is possible to increase the intensity of surface discharge in the vicinity of the barrier ribs that partition the discharge space, and it is possible to increase the brightness of the display.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a PDP according to the present invention.

FIG. 2 is a plan view showing a configuration of display electrodes of the PDP shown in FIG.

FIG. 3 is a plan view showing a structure of a display electrode of a conventional PDP.

[Explanation of symbols]

 1 PDP (Surface Discharge Plasma Display Panel) 11, 21 Glass Substrate (Substrate) 29 Partition 30 Discharge Space 41 Transparent Conductive Film 42 Metal Film A Address Electrode EU Unit Light Emitting Area H Display Surface X, Y Display Electrode

Claims (2)

[Claims] 1. A pair of display electrodes (X) (Y) for surface discharge comprising a transparent conductive film (41) and a metal film (42) overlapping the transparent conductive film (41) on a substrate (11) on the display surface (H) side. And a surface discharge type plasma display panel (1) having a stripe-shaped partition wall (29) for partitioning a discharge space (30) into unit light emitting regions (EU) on a back side substrate (21). In the metal film (42) of the one display electrode (X), the intersection with the partition wall (29) projects toward the other display electrode (Y) with respect to the other portion. The surface discharge plasma display panel, wherein the metal film (42) of the other display electrode (Y) is formed in a straight line parallel to the transparent conductive film (41). . 2. A method of driving a surface discharge type plasma display panel (1) according to claim 1, wherein the other display electrode (Y) and an address electrode arranged in parallel with the partition wall (29). A method of driving a surface discharge type plasma display panel, characterized in that an address discharge for selectively causing each unit light emitting region to emit light is generated between the unit and (A).