JP2004206940A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a plasma display panel with a structure of high reliability in suppression of crosstalk between adjacent discharging cells. <P>SOLUTION: The plasma display panel is constituted to be provided with the discharging cells 17 having their surroundings sectioned by a separating wall 18 and a groove part 21 in one part on a top part of the separating wall 18. By this groove part 21, the contraction in volume rate of the separating wall 18 is made small and therefore, the deformation of the separating wall 18 after calcination is suppressed. As the result, the formation of a gap between a front surface plate 2 is suppressed and remaining charged particle, etc., after discharging is suppressed from moving and being dispersing between the discharge cells 17, and the crosstalk between the adjacent discharge cells 17 hardly occurs. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display panel (hereinafter, referred to as a PDP) used for displaying images on computers and televisions.
[0002]
[Prior art]
FIG. 12 is a sectional perspective view showing a schematic structure of a conventional PDP.
[0003]
The front panel 2 of the PDP 1 has a display electrode 6 including a scan electrode 4 and a sustain electrode 5, a dielectric layer 7 covering the display electrode 6, and a transparent and insulating front substrate 3 such as glass. Further, a protective layer 8 made of, for example, an MgO film is provided to cover the dielectric layer 7. The scan electrode 4 and the sustain electrode 5 have a structure in which bus electrodes 4b and 5b made of a metal material are stacked on the transparent electrodes 4a and 5a for the purpose of reducing electric resistance and ensuring transparency.
[0004]
The back plate 9 includes, on an insulating back substrate 10 such as glass, a data electrode 11 orthogonal to the display electrode 6, a dielectric layer 12 covering the data electrode 11, A grid-shaped partition wall 18 for partitioning a plurality of discharge cells 17 (unit light emitting regions) formed at a portion where the display electrode 6 and the data electrode 11 intersect, and a phosphor formed on the inner wall of the region surrounded by the partition wall 18 And a layer 15 (for example, see Non-Patent Document 1).
[0005]
The front plate 2 and the rear plate 3 opposed to each other with the partition wall 18 interposed therebetween are configured such that the periphery outside the image display area is sealed with a sealing member, and the discharge space 16 has, for example, Ne-Xe 5%. Is sealed at a pressure of 66.5 kPa (500 Torr). Then, the intersection between the display electrode 6 and the data electrode 11 in the discharge space 16 operates as a discharge cell 17 (unit light emitting area).
[0006]
Here, since the discharge cells 17 have a structure in which the periphery is surrounded by the lattice-shaped partition walls 18, there are problems such as crosstalk between the adjacent discharge cells 17 and fluctuations in the firing voltage due to the influence of priming. Can be suppressed.
[0007]
[Non-patent document 1]
2001 FPD Technology Taizen, Electronic Journal Co., Ltd., October 25, 2000, p724-p725
[0008]
[Problems to be solved by the invention]
However, even in the PDP having the above-described structure, there is a case where a problem of a reduction in a driving margin, which is considered to be caused by a change in wall voltage at the time of displaying an image, occurs. The cause is considered to be as follows as a result of a study conducted by the present inventors. That is, when forming the partition wall and the barrier, first, the material is formed into the shape of the partition wall and the barrier, and then sintering is performed. A tensile stress is generated, and as a result, the partition wall 18 may be deformed, and a gap may be formed between the partition wall 18 and the front plate 2.
[0009]
In such a case, the residual charged particles and the like after the discharge may move and diffuse between the adjacent discharge cells 17 through the gap, and as a result, crosstalk between the adjacent discharge cells 17 may occur, and the driving may occur. It turns out that the margin is reduced.
[0010]
The present invention has been made in view of the above situation, and has as its object to realize a plasma display panel having a highly reliable structure for suppressing crosstalk between adjacent discharge cells.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display panel of the present invention is a plasma display panel having discharge cells whose periphery is partitioned by partition walls, and having a groove at a part of the top of the partition walls.
[0012]
In order to achieve the above object, a plasma display panel according to the present invention has a front plate and a back plate which are arranged to face each other, and the front plate has a display electrode composed of a scanning electrode and a sustain electrode. The face plate has a data electrode orthogonal to the display electrode, and a grid-like partition partitioning a plurality of discharge cells formed at a portion where the display electrode and the data electrode intersect, and a groove is formed at a part of the top of the partition. It has.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the invention according to claim 1 of the present invention is a plasma display panel having discharge cells whose periphery is partitioned by partition walls, and having a groove at a part of the top of the partition walls.
[0014]
Further, the invention according to claim 2 has a front plate and a rear plate that are arranged to face each other, the front plate has a display electrode composed of a scanning electrode and a sustain electrode, and the rear plate has a display electrode and a display electrode. A plasma display panel having orthogonal data electrodes and a grid-like partition partitioning a plurality of discharge cells formed at a portion where a display electrode and a data electrode intersect, and having a groove at a part of the top of the partition. is there.
[0015]
According to a third aspect of the present invention, in the first or the second aspect of the present invention, the front plate has a communication portion that non-linearly communicates an adjacent discharge cell with a part of the contact portion with the partition wall. It is provided with.
[0016]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the communicating portion is provided on the opening surface of the second groove provided on the front plate and having a width larger than the width of the top of the partition. Are made to face each other in a state of contact or insertion.
[0017]
According to a fifth aspect of the present invention, in the invention of the fourth aspect, the width Wd (μm) of the groove is a total Wtr2 (μm) of the width of the top of the partition wall facing the groove, and the second groove. Has a relationship of 3 ≦ (Wd−Wtr2−Wipg) / 2 ≦ 17 with respect to the width Wipg (μm) at the top of the partition wall.
[0018]
In the invention according to claim 6, in the invention according to claim 4, the distance D (μm) between the bottom surface of the groove and the top of the partition wall facing the groove has a relationship of 3 ≦ D ≦ 17. Things.
[0019]
Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to FIGS. The same components as those shown in FIG. 12 used in the description of the conventional PDP are denoted by the same reference numerals.
[0020]
(Embodiment 1)
FIG. 1 is a sectional perspective view showing a schematic structure of a PDP according to the first embodiment. FIG. 2 is a plan view showing a positional relationship between the display electrode 6 and the grid-like partition 18 of the PDP according to the first embodiment, and FIG. 3 is a sectional view taken along the line AA in FIG. is there.
[0021]
The front panel 2 of the PDP 1 has a display electrode 6 including a scan electrode 4 and a sustain electrode 5, a dielectric layer 7 covering the display electrode 6, and a transparent and insulating front substrate 3 such as glass. Further, a protective layer 8 made of, for example, an MgO film is provided to cover the dielectric layer 7. The scan electrode 4 and the sustain electrode 5 have a structure in which bus electrodes 4b and 5b made of a metal material are stacked on the transparent electrodes 4a and 5a for the purpose of reducing electric resistance and ensuring transparency.
[0022]
The back plate 9 includes, on an insulating back substrate 10 such as glass, a data electrode 11 orthogonal to the display electrode 6, a dielectric layer 12 covering the data electrode 11, A grid-shaped partition wall 18 for partitioning a plurality of discharge cells 17 (unit light emitting regions) formed at a portion where the display electrode 6 and the data electrode 11 intersect, and a phosphor formed on the inner wall of the region surrounded by the partition wall 18 And a layer 15.
[0023]
The front plate 2 and the rear plate 3 opposed to each other with the partition wall 18 interposed therebetween are configured such that the periphery outside the image display area is sealed with a sealing member, and the discharge space 16 has, for example, Ne-Xe 5%. Is sealed at a pressure of 66.5 kPa (500 Torr).
[0024]
In the above configuration, the scanning electrode 4 (the number is given when the N-th line is indicated), the sustain electrode 5 (the number is indicated when the N-th line is indicated), and the data electrode 11 (the number is indicated when the N-th line is indicated). FIG. 4 schematically shows the relative positional relationship with the (numbered).
[0025]
Next, a driving method of the PDP will be described with reference to FIGS.
[0026]
FIG. 5 is a block diagram illustrating a schematic configuration of an image display device 100 using the PDP 1 of the present invention, and FIG. 6 is a diagram illustrating an example of a driving waveform applied to each electrode of the PDP 1 at that time.
[0027]
First, in an initializing period, an initializing pulse is applied to the scan electrodes 4 to initialize wall charges in the discharge cells 17 of the PDP 1.
[0028]
In the next write period, a scan pulse is simultaneously applied to the first scan electrode 4 (1), and a write pulse is simultaneously applied to a line of the data electrode 11 corresponding to the discharge cell 17 for performing display, thereby causing a write discharge. By doing so, wall charges are accumulated on the surface of the dielectric layer. Similarly, a scan pulse is simultaneously applied to the second scan electrode 4 (2), and a write pulse is simultaneously applied to a line of the data electrode 11 corresponding to the discharge cell 17 for performing display, thereby performing a write discharge. Wall charges are accumulated on the surface of the dielectric layer. By performing the above operation for all the scanning electrodes 4, the wall charges corresponding to the discharge cells 17 for displaying are sequentially accumulated on the surface of the dielectric layer, and the latent image for one screen is written.
[0029]
In the next sustain period, the data electrodes 11 are grounded and sustain pulses are alternately applied to the scan electrodes 4 and the sustain electrodes 5 in order to perform sustain discharge, whereby wall charges are accumulated on the surface of the dielectric layer. In the discharge cell 17 that has been discharged, that is, the discharge cell 17 selected by the write pulse, a discharge occurs when the potential of the surface of the dielectric layer exceeds the discharge start voltage, and the sustain pulse is applied (sustain period). , Main discharge is maintained.
[0030]
Then, in the subsequent erasing period, an incomplete discharge is generated by applying a narrow erasing pulse, and the wall charges disappear, so that erasing is performed.
[0031]
When displaying a television image, the image is composed of 60 fields per second in the NTSC system. Originally, in a plasma display panel, only two gradations of lighting or extinguishing can be expressed, so in order to display an intermediate color, the lighting time of each color of red (R), green (G), and blue (B) is time-divided. A method is used in which one field is divided into several subfields, and an intermediate color is expressed by a combination of the subfields. As an example of the division of the subfields in the case of expressing 256 gradations for each color in the PDP 1, as shown in FIG. 7, one field is divided into eight subfields, and the voltage is applied within the sustain period of each divided subfield. There is a method in which the ratio of the number of sustain pulses to be performed is weighted in binary such as 1, 2, 4, 8, 16, 32, 64, and 128, and 256 gradations are expressed by a combination of these 8 bits. Further, in order to further improve the image quality, the number of subfields is increased, and a plurality of combinations of subfield weights for displaying the gradation are used, so that a pseudo contour generated due to a movement of a line of sight during moving image display can be reduced. Reduction methods have also been used. As described above, in the driving method of the PDP 1, display is performed by a series of sequences including the initialization period, the writing period, the sustaining period, and the erasing period.
[0032]
In the above configuration, as shown in FIGS. 1 to 3, the partition wall 18 has the groove 21 at the top. Due to the presence of the groove 21, the volume shrinkage of the partition 18 is reduced, and therefore, the deformation of the partition 18 after firing is suppressed. As a result, a gap is prevented from being formed between the discharge cell 17 and the front plate 2, so that the remaining charged particles and the like after the discharge are prevented from moving and diffusing between the adjacent discharge cells 17, and are suppressed. Crosstalk between the discharge cells 17 is less likely to occur, and a reduction in driving margin is also suppressed.
[0033]
(Embodiment 2)
FIG. 8 is a plan view showing a positional relationship between the display electrode 6, the grid-like partition walls 18, and the communication portion 20 of the PDP according to the second embodiment, and FIG. 9 is a cross-sectional view taken along the line AA in FIG. 8. FIG. The difference from the first embodiment is that, as shown in FIG. 10, a cross-sectional view of a contact portion of the front plate 2 with the partition 18, for example, the front plate 2 is A groove 19 having a width Wd wider than the width Wtr of the top of the partition wall 18 is provided in a part of the dielectric layer 8 to be in contact with, and an opening surface 19a of the groove 19 (indicated by a dotted line in FIG. The top of the partition wall 18 is opposed to a surface at the same position as the inner surface 2a of the partition 18 in a state of contact (FIG. 10 (a)) or an inserted state (FIG. 10 (b)). That is, a communication section 20 that non-linearly communicates the adjacent discharge cells 17 with the intermediary is formed. In FIG. 8, the protective layer 8 is omitted. Here, the term “non-linearly communicating” means a structure that does not communicate linearly, that is, a structure in which (discharge spaces 16 of) the adjacent discharge cells 17 via the partition wall 18 cannot be directly viewed. Is what you do. In addition, for such a purpose, the top of the partition wall 18 is in a state of being inserted more than the opening surface 19 a of the groove 19 including the same surface.
[0034]
In this structure, the presence of the communication portion 20 prevents the exhaust conductance from being reduced in the exhaust process in the discharge space 16 before the discharge gas is filled in the PDP 1 manufacturing process. The degree is almost the same as that of the conventional PDP, that is, an effect is obtained that the impurity gas, which is considered to adversely affect the discharge characteristics such as H ₂ O and CO ₂ in the PDP 1, can be sufficiently exhausted.
[0035]
Here, FIG. 11 shows the relationship between the distance De (μm) between the dielectric layer 7 of the front panel 2 and the partition wall 18 at the groove 19 in the communication portion 20 and the decrease value ΔVw (V) of the wall voltage. This is the result of experiments performed on different IPGs when the Xe gas contained in the discharge gas was 5% and 15%. As can be seen from this figure, the reason why the drop value ΔVw (V) of the wall charge becomes an allowable range, for example, about 2 (V) or less, is that De (μm) is about 17 (μm) even under various conditions. It turns out that it becomes as follows. When De is 0 (μm), exhaust is insufficient, so that a certain gap is required, which is about 3 (μm) or more.
[0036]
Accordingly, the width of the groove 19 is Wd (μm), the sum of the widths of the tops of the partition walls 18 facing the groove 19 is Wtr2 (μm), and the width of the second groove 21 at the top of the partition 18 is Wipg (μm). ), (Wd−Wtr2−Wipg) / 2 = De (μm). Therefore, if the relation of 3 ≦ (Wd−Wtr2−Wipg) / 2 ≦ 17 is satisfied, writing is performed while ensuring the exhaust conductance. A decrease in wall voltage during operation is reduced, and a crosstalk margin can be improved. It is considered that this is because a reduction in wall charges due to the priming effect is suppressed by an effect of suppressing priming effect particles such as metastable particles remaining after discharge from diffusing to an adjacent discharge cell. In addition, it is conceivable that the driving margin is widened.
[0037]
For the same reason, if the distance between the bottom surface of the groove 19 and the top of the partition wall 18 facing the groove 19 is D (μm), D = De, so that the relation of 3 ≦ D ≦ 17 is satisfied. Is preferred.
[0038]
In the configuration of the first and second embodiments described above, the groove 21 is formed only in one direction of the partition 18. However, the present invention is not limited to such a configuration. The effect of the present invention can be similarly obtained even if the structure is formed in the direction. Further, the groove 21 may be continuous or discrete.
[0039]
Further, the partition 18 is not limited to the lattice shape, and the effect of the present invention can be similarly obtained as long as the partition 18 has a crossing portion.
[0040]
In addition, the groove portion 19 has a continuous form in one direction of the partition wall 18, but is not limited to such a form, and is formed discretely and formed in a different direction of the partition wall 18. It may be something.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to realize a plasma display panel having a highly reliable structure for suppressing crosstalk between adjacent discharge cells.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view showing a schematic configuration of a plasma display panel according to a first embodiment of the present invention. FIG. 2 is a diagram showing positions of display electrodes and grid-like partition walls of the plasma display panel according to the first embodiment of the present invention. FIG. 3 is a plan view showing the relationship; FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2; FIG. FIG. 5 is a block diagram showing a schematic configuration of an image display device using the plasma display panel according to the first embodiment of the present invention. FIG. 6 is a block diagram showing a plasma display panel according to the first embodiment of the present invention. FIG. 7 is a diagram showing an example of a drive waveform applied to an electrode. FIG. 8 is a plan view showing a positional relationship among display electrodes, grid-like partition walls, and communicating portions of a plasma display panel according to a second embodiment of the present invention. 9 is a cross-sectional view taken along the line AA in FIG. 8. FIG. 10 is a cross-sectional view showing a schematic state of an abutting portion between a dielectric layer and a partition wall of a front plate of the plasma display panel according to the first embodiment of the present invention. 11 is a diagram showing the relationship between the distance De between the dielectric layer of the front panel and the partition wall at the groove in the communicating portion of the plasma display panel according to the first embodiment and the reduction value ΔVw of the wall voltage. Sectional perspective view showing a schematic configuration of a plasma display panel of the present invention.
DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Front plate 3 Front substrate 7 Dielectric layer 8 Protective layer 9 Back plate 10 Back substrate 12 Dielectric layer 17 Discharge cell 18 Partition wall 21 Groove

Claims (6)

What is claimed is: 1. A plasma display panel having a discharge cell whose periphery is partitioned by a partition, wherein the plasma display panel has a groove at a part of the top of the partition. A front plate having a display electrode composed of a scan electrode and a sustain electrode; a back plate having a data electrode orthogonal to the display electrode; and a display electrode and a data electrode. And a lattice-shaped partition wall for partitioning a plurality of discharge cells formed at a portion where the partition wall intersects with the plasma display panel, and having a groove at a part of the top of the partition wall. 3. The plasma display panel according to claim 1, wherein the front plate includes a communication portion that non-linearly communicates an adjacent discharge cell at a part of a contact portion with the partition. The communicating portion is provided on the front plate, the opening of the second groove having a width wider than the width of the top of the partition, the top of the partition, the top, the contact, or is configured to face the state inserted. 4. The plasma display panel according to 3. The width Wd (μm) of the groove is 3 ≦ (Wd−Wtr2) with respect to the total width Wtr2 (μm) of the top of the partition wall facing the groove and the width Wipg (μm) of the second groove at the top of the partition wall. 5. The plasma display panel according to claim 4, wherein a relationship of (−Wipg) / 2 ≦ 17 is satisfied. 5. The plasma display panel according to claim 4, wherein a distance D (μm) between the bottom surface of the groove and the top of the partition wall facing the groove has a relationship of 3 ≦ D ≦ 17.

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