JP2004087166A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP capable of displaying a superior image, preventing erroneous discharge between adjacent discharging cells even if the PDP has high definition. <P>SOLUTION: A data electrode 11 of the discharging cells has a protruded part 11a protruding in parallel with the direction in which display electrodes 5 are arranged, and a dielectric layer 3 has at least one recess 16 overlapping with the display electrode 5. By the above, address discharge and sustained discharge are confined to the center part of the discharge cell 15, and the PDP, capable of displaying the superior image and preventing erroneous discharge between adjacent discharging cells even if the PDP has high definition, is realized. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display panel known as a display device.
[0002]
[Prior art]
2. Description of the Related Art In a plasma display panel (hereinafter, referred to as a PDP), an image is displayed by generating ultraviolet rays by gas discharge and exciting a phosphor with the ultraviolet rays to emit light.
[0003]
PDPs are roughly classified into two types: an AC type and a DC type in terms of driving, and a discharge type includes a surface discharge type and a counter discharge type. However, manufacturing is accompanied by high definition, large screen and simple structure. At present, a surface discharge type PDP having a three-electrode structure is mainly used because of its simplicity. The structure is such that a front plate having a plurality of display electrodes composed of scan electrodes and sustain electrodes, and a back plate having a plurality of data electrodes orthogonal to the display electrodes are opposed to each other, so that the display electrodes and the data electrodes are Since the discharge cells are formed at the intersections of the above and the phosphor layers are provided in the discharge cells, the phosphor layers can be made relatively thick, so that they are suitable for color display using phosphors.
[0004]
Such a PDP can display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and has a high display quality because it is a self-luminous type. In recent years, panel displays have attracted particular attention, and have been used for various purposes as display devices in places where many people gather and display devices for enjoying large-screen images at home.
[0005]
[Problems to be solved by the invention]
With respect to the above-mentioned PDPs, there is an increasing demand for higher definition. In order to respond to this, it is necessary to narrow the arrangement pitch of the discharge cells. In a cell, there is a problem that an erroneous discharge occurs between adjacent discharge cells, which adversely affects image display.
[0006]
The present invention has been made in view of such circumstances, and has as its object to realize a PDP capable of preventing erroneous discharge between adjacent discharge cells even with high definition and capable of displaying a good image.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display panel according to the present invention has a display cell including a plurality of scan electrodes and sustain electrodes formed on a front plate, and a discharge cell at a portion where a plurality of data electrodes formed on a back plate intersect. In the plasma display panel formed, in the discharge cell, the data electrode has a protrusion protruding in parallel with the arrangement direction of the display electrode, the protrusion intersects the display electrode, and the dielectric The layer is configured to have at least one concave portion overlapping the display electrode.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, according to the first aspect of the present invention, a discharge cell is formed at a portion where a display electrode formed of a plurality of scan electrodes and sustain electrodes formed on a front plate and a data electrode formed on a back plate intersect. In the discharge cell, in the discharge cell, the data electrode has a protrusion protruding in parallel with the arrangement direction of the display electrode, the protrusion intersects the display electrode, and the dielectric layer Have at least one concave portion overlapping the display electrode.
[0009]
According to a second aspect of the present invention, in the first aspect of the invention, when viewed from the front plate side, a portion other than the protruding portion of the data electrode is hidden by a partition partitioning a discharge cell. is there.
[0010]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the scan electrode and the sustain electrode each have a protrusion facing each other in the discharge cell, and the protrusion has a data electrode. It is configured to intersect with the protruding portion.
[0011]
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the protruding portion of the data electrode has a base portion that does not intersect with the display electrode and a tip portion that does not intersect with the display electrode. The configuration is such that:
[0012]
According to a fifth aspect of the present invention, in the fourth aspect of the invention, the shape of the tip portion is one shape selected from a polygonal shape, an elliptical shape, and a circular shape.
[0013]
According to a sixth aspect of the present invention, in the first aspect of the invention, the electrical resistance of the protruding portion of the data electrode is smaller than the electrical resistance of the other portions.
[0014]
According to a seventh aspect of the present invention, in the first aspect of the present invention, the thickness of the protruding portion of the data electrode is larger than the thickness of the other portions.
[0015]
Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 is a sectional perspective view showing a schematic configuration of a PDP according to an embodiment of the present invention. FIG. 2 is a diagram showing the shapes of the display electrode 5 and the data electrode 11 and the positional relationship between the display electrode 5, the data electrode 11 and the partition 12.
[0017]
The front plate 1 has a structure in which a plurality of display electrodes 5 covered with a dielectric layer 3 and a protective film 4 made of a MgO vapor deposition film are provided on a transparent and insulating substrate 2 such as glass. The display electrode 5 is a pair of a scanning electrode 6 and a sustaining electrode 7, and the scanning electrode 6 is opaque by a transparent electrode 6a and a metal material such as Cr / Cu / Cr or Ag formed thereon. The sustain electrode 7 comprises a transparent electrode 7a and an opaque bus electrode 7b formed on the transparent electrode 7a and made of a metal material such as Cr / Cu / Cr or Ag. Scan electrode 6 and sustain electrode 7 face each other with a discharge gap MG therebetween.
[0018]
The back plate 8 is provided with a plurality of data electrodes 11 covered with a dielectric layer 10 arranged in an intersecting direction with the display electrodes 5 on an insulating substrate 9 such as glass. The electrode 11 has a protruding portion 11 a protruding in parallel with the arrangement direction of the display electrodes 5.
[0019]
A stripe-shaped partition wall 12 is provided between the data electrodes 11 on the dielectric layer 10 in parallel with the arrangement direction of the data electrodes 11, and the fluorescent material is formed in a stripe shape from the surface of the dielectric layer 10 to the side surface of the partition wall 12. It has a structure in which a layer 13 is provided. The front plate 1 and the rear plate 8 are opposed to each other so as to form a discharge space 14 inside the partition wall 12 and to form a discharge cell 15 at a portion where the display electrode 5 and the data electrode 11 intersect. Are located.
[0020]
The discharge cell 15 is filled with at least one rare gas of helium, neon, argon, and xenon as a discharge gas. Generally, a gas of Ne-Xe 5% is used.
[0021]
Then, a discharge is generated by applying a periodic voltage to the data electrode 11 and the display electrode 5, and the image is displayed by irradiating the phosphor layer 13 with ultraviolet rays by the discharge and converting it into visible light. .
[0022]
Hereinafter, features of the present embodiment will be described in more detail. 3 is a cross-sectional view of the PDP taken along the line XX in FIG. 2, FIG. 4 is a cross-sectional view of the PDP taken along the line YY in FIG. 2, and FIG. It is sectional drawing of PDP of the -Z arrow view.
[0023]
As shown in FIGS. 2 to 5, a discharge space 14 at a portion where the projection 11 a of the data electrode 11 intersects the scan electrode 6 and the sustain electrode 7 as the display electrode 5 is a discharge cell 15. The dielectric layer 3 of the discharge cell 15 has at least one concave portion 16 overlapping the display electrode 5. The protective film 4 is formed on the surface of the dielectric layer 3 following the concave portion 16. In FIG. 2, portions corresponding to the discharge cells 15 and the concave portions 16 are indicated by dotted lines.
[0024]
The operation of the above configuration is as follows. It is considered that the cause of the erroneous discharge between the adjacent discharge cells 15 due to the high definition of the PDP is that the charge at the time of discharge affects the adjacent discharge cells 15. In the conventional PDP, the data electrodes 11 and the display electrodes 5 of the front panel 1 in the discharge cells 15 are formed to intersect as shown in FIG. It is considered that this occurs at a portion where the distance to one bus electrode 6b or 7b is closest. This is probably because the bus electrode 6b or 7b is thicker (about 5 μm) than the transparent electrodes 6a and 7a, and the dielectric layer 3 on the bus electrodes 6b and 7b is thinner. . That is, the discharge is a phenomenon close to lightning in a natural phenomenon, and it is considered that an address discharge is likely to be generated toward the bus electrodes 6b and 7b having a large thickness and a low resistance and having good conductivity. Here, as apparent from FIG. 6, the location where the address discharge 17 occurs is close to the adjacent discharge cell 15, and therefore, the influence of the address discharge 17 on the adjacent discharge cell 15 becomes large.
[0025]
On the other hand, according to the present embodiment, data electrode 11 has protruding portion 11a protruding in parallel with the arrangement direction of display electrodes 5, and this protruding portion 11a intersects with display electrode 5, and The dielectric layer 3 has at least one concave portion 16 overlapping the display electrode 5. Therefore, as shown in FIG. 5, the address discharge 17 is generated at the intersection of the projection 11a of the data electrode 11 and the display electrode 5, and the location where the address discharge 17 occurs is located at the center of the discharge cell 15. The influence on the adjacent discharge cells 15 is reduced.
[0026]
Further, due to the presence of the concave portion 16 of the dielectric layer 3, the thickness of the dielectric layer 3 is different between the concave portion 16 and the other region, so that the capacitance as a capacitor is different and the discharge voltage is also different. That is, since the electric charge easily accumulates in the concave portion 16 and the discharge voltage is low, it is easy to generate and maintain the discharge. In the region other than the concave portion 16, the electric charge hardly accumulates and the discharge voltage becomes high. Generation and maintenance are difficult. As described above, the sustain discharge generated between the scan electrode 6 and the sustain electrode 7 during the sustain period due to the recess 16 is limited to the recess 16 and does not spread unnecessarily. In this case, the influence on the adjacent discharge cells 15 is reduced.
[0027]
As described above, according to the present embodiment, the discharge at the time of the address discharge and the sustain discharge can be limited to the central portion of discharge cell 15, and erroneous discharge or the like to adjacent discharge cell 15 can be suppressed.
[0028]
Further, as another embodiment of the present invention, as shown in FIG. 7, the scanning electrode 6 and the sustaining electrode 7 have projecting portions 6c and 7c, respectively, so as to face each other at the discharge gap MG. There is a configuration in which an address discharge is performed between one of the protrusions 6c and 7c and the protrusion 11a of the data electrode 11, and a sustain discharge is performed between the protrusions 6c and 7c. FIG. 7 shows an example in which the protruding portions 6c and 7c are configured by the transparent electrodes 6a and 7a. With this configuration, the address discharge and the sustain discharge are formed at the further central portion of the discharge cell 15, and the erroneous discharge can be further suppressed.
[0029]
In the above, the shapes of the protruding portions of the transparent electrodes 6a and 7a are not limited to this as long as the control of the discharge area in the discharge cell 15 is achieved.
[0030]
As described above, when the protruding portions 6c and 7c are configured by the transparent electrodes 6a and 7a, light emitted from the phosphor layer 14 can be transmitted through the front plate 1 efficiently.
[0031]
Further, when the protruding portions 6c and 7c are configured by the bus electrodes 6b and 7b and the transparent electrodes 6a and 7a are eliminated, the cost can be significantly reduced, and the bus electrodes 6b and 7b are made of a metal material. Since the electric conductivity is higher than that of the transparent electrodes 6a and 7a, the electric charges easily accumulate in the concave portions 16 of the dielectric layer 3, and the regulation of the discharge area in the discharge cells 15 is further ensured. In this case, the bus electrodes 6b and 7b are non-transparent, so that light emission from the phosphor layer 13 is blocked. However, the projecting portions 6c and 7c are formed in a comb shape divided into two or more places. By reducing the light-shielding area of the protrusions 6c and 7c without changing the discharge gap MG, for example, by changing the discharge gap MG, or by hollowing out the inside, it is possible to supplement the transparency without impairing the effect of the present invention. .
[0032]
Further, as another embodiment of the present invention, as shown in FIG. 8, the base 11b of the protruding portion 11a does not intersect the display electrode 5, and only the tip 11c intersects the display electrode 5. There is. According to this configuration, in the discharge cell 15, the portion of the data electrode 11 that intersects the display electrode 5 is only the tip 11 c of the data electrode 11, so that the address discharge is reliably performed only at the center of the discharge cell 15. As a result, the effect of suppressing erroneous discharge is further enhanced.
[0033]
In addition, the shape of the protruding portion 11a of the data electrode 11 described above may be an elliptical shape or a circular shape in addition to a polygonal shape having the discharge gap MG as a center as shown in FIG. In any case, the effect of controlling the location and region where the address discharge occurs is further enhanced, which is preferable.
[0034]
Further, the electrical resistance of the protruding portion 11a of the data electrode 11 is made smaller than the electrical resistance of the other portion to make it highly conductive. For example, the film thickness of the protruding portion 11a is larger than that of the other portion. Also, the effect of controlling the location and region where the address discharge occurs can be further enhanced by the formation. In such a case, as shown in FIG. 8, a portion other than the protruding portion 11 a of the data electrode 11 is not concealed by the partition wall 12 that partitions the discharge cell 15, and a part or the whole is exposed in the discharge cell 15. It doesn't matter. This case is preferable because alignment at the time of manufacturing can be easily performed.
[0035]
【The invention's effect】
As described above, according to the plasma display of the present invention, erroneous discharge between adjacent discharge cells can be prevented even with high definition, and a PDP capable of displaying a good image can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view showing a schematic configuration of a plasma display panel according to an embodiment of the present invention. FIG. 2 is a positional relationship among display electrodes, data electrodes, and partition walls of the plasma display panel according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a PDP corresponding to a view taken along arrow XX in FIG. 2 FIG. 4 is a cross-sectional view of a PDP corresponding to a view taken along arrow YY in FIG. FIG. 6 is a cross-sectional view of a PDP corresponding to the arrow ZZ in FIG. 2; FIG. 6 is a view showing a sustain discharge generation location in a conventional plasma display panel; FIG. 7 is a plasma display panel according to another embodiment of the present invention; FIG. 8 is a diagram showing a positional relationship between display electrodes, data electrodes, and partition walls of FIG. 8; FIG. 8 is a diagram showing a positional relationship between display electrodes, data electrodes, and partition walls of a plasma display panel according to another embodiment of the present invention; ]
DESCRIPTION OF SYMBOLS 1 Front plate 2 Substrate 3 Dielectric layer 4 Protective film 5 Display electrode 6 Scan electrode 7 Sustain electrode 8 Back plate 9 Substrate 10 Dielectric layer 11 Data electrode 11a Projection 11b Root 11c Tip 12 Partition wall 13 Phosphor layer 14 Discharge Space 15 discharge cell 16 recess

Claims (7)

A plasma display panel in which discharge cells are formed at intersections between display electrodes formed of a plurality of scan electrodes and sustain electrodes formed on a front plate and data electrodes formed on a back plate, wherein the discharge cells include data electrodes. Has a projecting portion projecting in parallel to the arrangement direction of the display electrodes, the projecting portion intersects with the display electrode, and the dielectric layer has at least one concave portion overlapping the display electrode; Plasma display panel. 2. The plasma display panel according to claim 1, wherein a portion other than the protruding portion of the data electrode is hidden by a partition partitioning the discharge cell when viewed from the front plate side. 3. The plasma display panel according to claim 1, wherein the scan electrode and the sustain electrode each have a protrusion facing each other in the discharge cell, and the protrusion intersects with the protrusion of the data electrode. 4. The plasma display panel according to claim 1, wherein the protruding portion of the data electrode has a configuration in which a root portion does not intersect with the display electrode and a tip portion intersects with the display electrode. The plasma display panel according to claim 4, wherein the shape of the tip portion is one selected from a polygonal shape, an elliptical shape, and a circular shape. 6. The plasma display panel according to claim 1, wherein an electrical resistance of the protruding portion of the data electrode is smaller than an electrical resistance of other portions. 6. The plasma display panel according to claim 1, wherein the thickness of the protruding portion of the data electrode is larger than the thickness of the other portion.

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